ANDREAS STIHL AG & CO. KG Patent applications |
Patent application number | Title | Published |
20150273729 | CHAIN FOR A WORK IMPLEMENT, METHOD FOR PRODUCING A STUD FOR A CHAIN AND METHOD FOR PRODUCING A DRIVING MEMBER FOR A CHAIN - A chain for a work implement has lateral connecting members connected to central driving members via studs. The stud has two lateral portions spaced apart from one another by a collar. A driving member is mounted pivotably on the collar. At the collar the stud has a surface layer harder than the base material. For a high chain service life, the stud has a diffusion layer above a surface layer above the base material. To produce the stud, the stud is provided with a diffusion layer at least at the collar, and a surface region of the collar is hardened, such that a surface layer is formed between the diffusion layer and the base material of the stud. For a method for producing a driving member, the driving member is provided with a diffusion layer at least at a circumferential surface of a hole and the driving member is hardened. | 10-01-2015 |
20150047491 | Guide Bar for a Saw Chain of a Motor-Driven Chain Saw and Application of a Marking on a Guide Bar of a Motor-Driven Chain Saw - A guide bar for a saw chain of a chain saw has a fastening section and a redirecting section. The guide bar has an imaginary longitudinal center axis extending from the fastening section to the redirecting section. The guide bar has at least one first marking in the form of a line. The first marking is inclined at an angle of about 20° to about 80° with respect to the longitudinal center axis when viewing the guide bar in side elevation. The first marking is used to estimate, during operation, the depth (t) of a groove produced by the saw chain in the workpiece in the case of a cut in which the longitudinal center axis of the guide bar is inclined at an angle of about 20° to about 80° to the surface of the workpiece. | 02-19-2015 |
20150027745 | HANDHELD WORK APPARATUS - A handheld work apparatus has a motor unit comprising a drive motor. The drive motor drives a tool of the work apparatus, for example a saw chain. The apparatus has a grip unit with a handle that is vibrationally decoupled from the motor unit via an antivibration element. The antivibration element is connected to a first component of the grip unit via a holding device and a second component of the motor unit via a holding element. Arranged in the connection of the first component to the second component through the antivibration element is a predetermined breaking point formed in a third component that is replaceable independently of the first component and the second component. The strength of the connection of the first component to the second component through the antivibration element is lowest at this predetermined breaking point. | 01-29-2015 |
20150026988 | HAND-HELD WORK IMPLEMENT - A hand-held work implement comprises a housing, at least one tool and a combustion engine for driving the tool. The combustion engine has a cylinder and has a piston which drives a crankshaft in rotation about an axis of rotation. The crankshaft drives a fan impeller. The work implement has a handle unit with a handle bar and has an engine unit, these being connected to one another via anti-vibration elements. The combustion engine has a transverse plane which encompasses the cylinder longitudinal axis and which runs parallel to the axis of rotation of the crankshaft. The transverse plane divides the work implement into a front region, in which a section of the tool that projects out of the housing is arranged, and a rear region. The fixing of the anti-vibration element to the cylinder is realized in the front region. | 01-29-2015 |
20140366828 | WORK IMPLEMENT WITH AN INTERNAL COMBUSTION ENGINE - A work implement has an internal combustion engine that drives a tool of the work implement via a clutch. The clutch has at least one driving element which is operatively connected to the internal combustion engine and at least one output element which is operatively connected to the tool. The internal combustion engine has a starting device with a starting position and an operating position. To avoid unintentional rotation of the output element when starting the internal combustion engine, the work implement has a blocking device with a detent pawl. In an actuated position, the detent pawl projects into the movement path of the output element, limiting the rotation of the output element. In an unactuated position, the detent pawl releases the output element. The starting device has an actuating device which, in the starting position, keeps the detent pawl in the actuated position. | 12-18-2014 |
20140352660 | Hand-held power tool with an internal combustion engine - A hand-held power tool has an internal combustion engine provided with a throttle trigger adjustable between an idle position and a full throttle position. The engine has an operating mode selector adjustable between an operating position and a start position. In an intake passage of the engine, a throttle element is arranged that is in a throttling position when the operating mode selector is in the start position. The throttle element is secured in the throttling position by a locking action. The locking action is released when the throttle trigger is moved from the idle position toward the full throttle position. A restoring element is coupled permanently to the position of the throttle trigger. The restoring element, when the throttle trigger is moved for releasing the locking action, acts on the operating mode selector and restores the operating mode selector from the start position into the operating position. | 12-04-2014 |
20140299098 | METHOD FOR OPERATING AN INTERNAL COMBUSTION ENGINE - An internal combustion engine includes a cylinder and a piston journalled to reciprocate therein. The cylinder and piston conjointly delimit a combustion chamber into which a spark plug projects. Ignition of the spark plug occurs at an ignition time point controlled by a control unit. The ignition time point is controlled in an idle speed range according to an idle control having a most advanced ignition time point. The engine has a decompression valve which, when open, connects the combustion chamber to a pressure relief space. The valve is open during engine start and closes when pressure in the combustion chamber exceeds a closing pressure. To close the valve, the ignition occurs in the idle speed range for an engine cycle departing from the idle control at a closing ignition time point lying approximately 5° crankshaft angle ahead of the most advanced ignition time point. | 10-09-2014 |
20140291080 | HAND-HELD WORK IMPLEMENT AND PROCESS FOR PRODUCING A BRAKING DEVICE OF A HAND-HELD WORK IMPLEMENT - A hand-held work implement having a tool has a braking device for the tool that includes a brake band which wraps around a brake drum. The brake band and the brake drum undergo friction as they move relative to one another during braking. At least one of the band or drum comprises an austenitic steel, a duplex steel, super duplex steel, a nickel-base alloy or a cobalt-base alloy and has a base body and a marginal layer. The hardness of the marginal layer is approximately 150% to approximately 600% of the hardness of the base body and the carbide proportion in the marginal layer is less than approximately 0.5% by weight. A process for production of the foregoing includes diffusing carbon and/or nitrogen into a marginal layer at a temperature of less than 500° C. | 10-02-2014 |
20140261277 | INTERNAL COMBUSTION ENGINE HAVING AN INTAKE DEVICE - An internal combustion engine has an intake device having an air filter and at least one port. Combustion air is sucked in from the clean side of the air filter to the internal combustion engine via the port. The intake device has air trunking, in which at least a first section and a second section of the port are guided. The air trunking has a longitudinal center axis, wherein combustion air flows in the first section of the port in a first direction of flow running in the direction of the longitudinal center axis. The combustion air flows in the second section of the port in a second direction of flow oriented in an opposite direction to the first direction of flow and in the direction of the longitudinal center axis. As a result, a compact overall size is achieved with port length. | 09-18-2014 |
20140252152 | Coil Support for a Trimmer Line Coil - A coil support with a coil of a trimmer line has a coil core with an outer wall surface and first and second axial ends. At the axial ends securing elements that project past the wall surface of the coil core are provided for positional fixation of the coil wound onto the coil core. A securing element provided at the first axial end is a support plate with a longitudinal center axis. The size of the support plate is provided in the direction of the longitudinal center axis with a greater extension than transverse to the longitudinal center axis such that the support plate in a first radial direction of the coil core is greater than in a second radial direction. The coil core is fixedly connected with the support plate and with the further securing elements that are provided on the second axial end. | 09-11-2014 |
20140250702 | HANDHELD WORK APPARATUS HAVING A TENSIONING DEVICE FOR A CHAIN - A handheld work apparatus has a guide bar having a periphery along which a chain runs. The work apparatus has a housing and a fastening arrangement for fixing the guide bar to the housing. The fastening arrangement has an actuating device which can be actuated in a fastening direction in order to fix the guide bar. The work apparatus has a tensioning device to tension the chain. The tensioning device includes a tensioning spring. When the fastening arrangement is loosened, the tensioning spring exerts a force in a tensioning direction of the chain on the guide bar. Simple operation and a simple construction are achieved if the tensioning spring is in operative connection with the actuating device and is tensioned during actuation of the actuating device in the fastening direction. | 09-11-2014 |
20140250701 | GUIDE BAR HAVING A CARBON FIBER REINFORCED PLASTIC INSERT - A guide bar for a chain saw has an elongate main body of steel. The main body has flat sides and upper and lower peripheries defining a guide groove for a saw chain. An elongate window is formed in the main body between the peripheries and is filled with an insert made of a fiber composite material made up of resin and fibers. The fibers are in the direction of the longitudinal axis of the main body. The insert includes a plurality of fiber layers that are bonded with resin. A central layer is formed from a fiber layer and the fibers thereof are at an angle to the longitudinal axis. Two fiber layers having fibers oriented in the direction of the longitudinal axis of the main body are on both sides of the central layer. The inner fiber layers are covered outwardly by a woven fabric. | 09-11-2014 |
20140250699 | Trimmer Head for a Trimmer - A trimmer head for a trimmer has a base member having a trimmer line opening. A clamping device arranged in the base member clamps a trimmer line that defines a cutting plane when rotated. The clamping member of the clamping device is rotatably disposed on a pivot bolt having a pivot axis positioned in a plane that is parallel to the cutting plane. The clamping member is spring-loaded by a clamping spring into a clamping position. The trimmer line is secured in the clamping position between a clamping surface and the clamping member. A centrifugal force acting on the trimmer line loads the clamping member in the clamping position. A U-shaped bracket has bracket legs connected by a stay. The clamping member is positioned between the bracket legs. The pivot bolt is supported on the bracket leg ends. The stay of the U-shaped bracket forms the clamping surface. | 09-11-2014 |
20140216402 | Carburetor for a hand-guided power tool and hand-guided power tool - A carburetor for a hand-guided power tool has a carburetor housing and a carburetor rotor supported rotatably in the carburetor housing about an axis of rotation. A needle is disposed on the carburetor rotor and projects into a fuel opening of the carburetor. An adjusting element is operatively connected to the needle so as adjust a position of the needle relative to the carburetor rotor. The adjusting element has an engagement contour that is to be engaged by a tool for adjusting the adjusting element. A securing contour that is fixedly connected to the carburetor rotor is provided. The securing contour, at any point of the securing contour, has a spacing to the axis of rotation of at least approximately 10 mm. | 08-07-2014 |
20140174772 | HANDHELD WORK APPARATUS HAVING A DRIVE MOTOR FOR DRIVING A WORK TOOL AND METHOD FOR OPERATING SAID APPARATUS - A handheld work apparatus has a drive motor for driving a tool, an operating element for operating the drive motor, a first inhibiting unit and a second inhibiting unit. Each inhibiting unit has a disable state and an enable state. The operating element is inhibited for operating the drive motor when at least one of the inhibiting units is in its disable state. The work apparatus further has a locking device which locks the first inhibiting unit in its enable state if the second inhibiting unit is in its enable state. A method for operating the work apparatus provides that the first inhibiting unit is locked in its enable state when the first inhibiting unit and the second inhibiting unit are situated in their enable states at the same time. | 06-26-2014 |
20140166325 | WORK APPARATUS - A work apparatus has a drive motor for driving a work tool and has a control unit for the drive motor. The operating device includes an actuating element actuated by a user. The actuating element is mounted in a movable manner in a housing and can be adjusted in an actuating direction between a zero position and a maximum position. An intermediate stop acts between the zero position and the maximum position. The position of the intermediate stop is settable via a setting element. After the intermediate stop has been reached, the actuating element can be actuated further as far as the maximum position. The operating force (F) for further actuating the actuating element increases when the intermediate stop is reached. Provision is made for the operating force (F) to drop again upon further actuation of the actuating element after the intermediate stop has been overcome. | 06-19-2014 |
20140165964 | Method for operating an internal combustion engine of a hand-guided power tool - In a power tool, an internal combustion engine is coupled by a clutch to a tool member. An ignition control device is provided that for each engine speed of the internal combustion engine specifies at least one ignition timing. For each engine speed of a first engine speed range a correlated first ignition timing is specified, wherein each first ignition timing is an ignition timing of a first ignition timing range. For each engine speed of a second engine speed range, adjoining the first engine speed range, a correlated second ignition timing is specified, wherein each second ignition timing is an ignition timing of a second ignition timing range. The first ignition timing is retarded by at least 5° crank angle relative to the second ignition timing. The first engine speed range extends at least from the coupling engine speed range to the limit engine speed of approximately 7,000 RPM. | 06-19-2014 |
20140165411 | Electric Shears - Electrical shears have a housing with an electric drive motor arranged in the housing. A motor shaft is connected to the drive motor. Blades are provided and at least one of the blades is connected to the motor shaft. The motor shaft acts on the at least one blade for opening or closing the blades. A manual actuating member with a guide member is guided in a translatory motion, wherein the guide member has a length extending in a direction of a straight actuating travel path of the manual actuating member. A control unit is provided that controls the drive motor as a function of an electric control signal, wherein the electric control signal represents a mechanical position of the manual actuating member. | 06-19-2014 |
20140144396 | Hand-guided power tool with internal combustion engine - A power tool has an internal combustion engine with a piston supported in the cylinder and delimiting a combustion chamber. A crankshaft is rotatably supported in the crankcase and driven by the piston. Combustion air is supplied to the combustion chamber via an intake passage that has a piston-controlled inlet opening and an intake section formed within the cylinder. The bottom of the intake section, when the cylinder axis is vertical and the crankcase is beneath the combustion chamber, connects lowermost points of passage cross-sections arranged in the intake section perpendicular to the flow direction. The bottom descends toward the crankcase when the longitudinal cylinder axis is vertical. A ramp arranged in the intake passage next to the inlet opening deflects a portion of flow flowing within the intake passage. The ramp, when the longitudinal cylinder axis is vertical, ascends in flow direction toward the crankcase. | 05-29-2014 |
20140115835 | PORTABLE WORK APPARATUS HAVING STRAPS - A portable work apparatus has a main unit and a work tool. The main unit is carried by the user via a strap. The strap has a fastening section which is secured to the main unit via a fastening element. The fastening section is held between a pressure surface of the fastening element and a fastening surface formed on the main unit. To prevent twisting of the strap when the fastening element is secured, provision is made for the fastening surface to be formed with a structure that increases the friction coefficient. The structure interacts with a bearing surface, facing the fastening surface, of the fastening section such that the fastening section, which is held in a clamped manner between the pressure surface of the fastening element and the fastening surface of the main unit, is prevented from rotating relative to the main unit. | 05-01-2014 |
20140093329 | ADJUSTMENT SAFEGUARD FOR A SET SCREW ON A CARBURETOR - An adjustment safeguard for a set screw on a carburetor includes a cap held non-rotatably on the head of the set screw. The cap is surrounded by a coaxially positioned wall sleeve fixed to the housing. A rotation stop is fixed to the housing to limit the angle of rotation of the cap in the sleeve in the rotational direction of the set screw. A through-opening in the cap permits inserting a tool into an engagement opening in the head of the set screw to avoid destruction by introducing too much torque into the adjustment safeguard. The form and opening width of the through-opening is limited by the use of a metal material such that a tool larger than the adjustment tool is not able to be inserted through the through-opening into the head of the set screw. The engagement opening is flexible to limit a maximum allowable adjustment torque. | 04-03-2014 |
20140070737 | HANDHELD WORK APPARATUS HAVING A DRIVE CIRCUIT FOR AN ELECTRIC MOTOR WHICH DRIVES OSCILLATING TOOLS - A handheld work apparatus having an electric motor and a drive circuit for the electric motor. The rotation movement of the motor is converted into an oscillating movement of the work tool via a gear mechanism. The motor is situated in a circuit including at least the motor and a switch for operating the motor. To reduce wear of the gear mechanism, a control unit for operating the motor in one of two directions of rotation is provided. The control unit independently determines a selected direction of rotation for a next operating cycle as a function of a control variable. When the motor is started, the motor is started by the control unit in the direction of rotation which is associated with a value of the control variable. The control variable changes before the motor is restarted for a following operating cycle. The value of the control variable is independently determined again for the following operating cycle. | 03-13-2014 |
20140049195 | CIRCUIT FOR ACTIVATING AN ELECTRIC MOTOR IN A HAND GUIDED WORK APPARATUS - A circuit for activating an electric motor in a work apparatus includes a main circuit having an electric motor, a rechargeable-battery pack, and an operating switch for activating the motor, and also a parallel branch to the battery pack and the operating switch. A capacitor is arranged in the parallel branch. To lower the electrical contact load on the operating switch, provision is made to arrange an electronic switch, which is connected in series with the capacitor, in the parallel branch. The series circuit which includes the capacitor and the electronic switch has a first and a second end. The ends form the only electrical power connection of the capacitor to the main circuit. The electronic switch in the series circuit will apply a supply voltage, which is provided by the battery pack, to the capacitor only after a period of time following closing of the operating switch has elapsed. | 02-20-2014 |
20140034011 | METHOD FOR SWITCHING OFF A ROTATIONAL SPEED LIMIT IN AN INTERNAL COMBUSTION ENGINE - A method controls the rpm of a combustion engine in a hand-held work apparatus such as a brushcutter. The engine drives a work tool via a clutch which engages as a function of the engine rpm (n). A spark plug is arranged in the combustion chamber and is driven by an ignition unit. During start of the engine, an rpm lock circuit is active and defines a control variable as a function of the instantaneous rpm (n | 02-06-2014 |
20140028332 | ARRANGEMENT FOR IDENTIFYING A SWITCHING POSITION OF A SWITCH ON AN INTERNAL COMBUSTION ENGINE IN A HANDHELD WORK APPARATUS - The invention relates to an arrangement for identifying a switching position of a switch (on an internal combustion engine in a handheld work apparatus. An energy source for supplying power to an inductive electrical load is provided, it being possible to connect the load to the energy source in order to be switched on and off via a controller. The switch is arranged in a voltage branch which is connected in parallel with the inductive load and in which a zener diode is also connected. The zener diode is activated or inactivated via the switch as a function of the switching position of the switch. The amplitude of the switch-off voltage, which is induced when the inductive load is disconnected, is limited by the zener diode, so that it is possible to read from the magnitude of the amplitude whether the switch is closed or open. | 01-30-2014 |
20140028126 | ELECTRIC DRIVE MOTOR FOR A WORK APPARATUS - An electric drive motor for a work apparatus includes a stator having two stator poles which are at a distance from one another in the circumferential direction and have respective field windings. The motor has a rotor which rotates between the stator poles and the rotor shaft of the rotor drives a fan wheel. The cooling-air flow generated by the fan wheel enters the stator, flows therethrough and is discharged therefrom. For effective cooling, a pole intermediate space is provided between the stator poles; and, for the cooling-air flow, this space is filled by a non-magnetic guide body to provide a cooling duct delimited by the guide body and the field windings. The guide body is fastened to a support at one stator end and is inserted axially into the stator at the other end thereof. | 01-30-2014 |
20140000537 | Power Tool | 01-02-2014 |
20140000407 | Power tool with Bowden cable | 01-02-2014 |
20130340722 | Internal combustion engine with fuel system - An internal combustion engine has a fuel system that has a fuel valve with a housing, wherein in the housing a fuel chamber is formed. A fuel pump pumps fuel from a fuel tank into the fuel chamber. A conveying pump provides forced conveyance of fuel into the fuel system. A feed line is connected to the fuel chamber of the fuel valve. The conveying pump is arranged in the feed line and supplies fuel to the fuel chamber. A relief line is connected to the fuel chamber of the fuel valve and a first valve is arranged in the relief line. | 12-26-2013 |
20130340701 | Internal combustion engine and hand-held power tool with internal combustion engine - An internal combustion engine of a hand-held power tool has a crankcase having a circumferential wall extending in a circumferential direction of the crankcase. A crankshaft is supported so as to be rotatable about an axis of rotation within the crankcase. At least one transfer passage extends from the crankcase into the cylinder of the engine, wherein the transfer passage has an inlet port at the crankcase. At least one fuel retaining device is disposed on the circumferential wall of the crankcase. A radial direction, starting at the axis of rotation of the crankshaft and extending outwardly, extends through the at least one fuel retaining device. The at least one fuel retaining device has a depth in the radial direction and a length in the circumferential direction. The at least one fuel retaining device, relative to the radial direction, has an asymmetric cross-section in the circumferential direction. | 12-26-2013 |
20130340693 | Power Tool - A power tool has an internal combustion engine with a cylinder. An injection valve supplies fuel to the internal combustion engine. A fuel pump conveys fuel from a fuel tank to the injection valve. A fan wheel is provided that is driven by the internal combustion engine. The cylinder is arranged in a first cooling zone of the power tool and the fan wheel conveys cooling air through the first cooling zone. The fuel pump is arranged in a second cooling zone of the power tool. Between the first cooling zone and the second cooling zone a buffer zone is arranged. The buffer zone is separated by at least one first partition from the first cooling zone and by at least one second petition from the second cooling zone. | 12-26-2013 |
20130327198 | Grass Blade for a Trimmer - A cutting blade for a hand-guided trimmer with a drive motor has a disk-shaped base member with cutting teeth disposed about a circumference of the base member. The base member has a first face and a second face opposite the first face. The cutting teeth each have a tooth face edge, the tooth face edge leading in driving direction of the cutting blade and extending radially, and a tooth back edge extending in the circumferential direction. The tooth face edge and the tooth back edge of the cutting teeth are alternatingly ground on the first face or the second face in the circumferential direction and define together a common cutting tip that is leading in the drive direction. Several of the cutting tips of the cutting teeth that are sequentially arranged in the circumferential direction are positioned in a common plane. | 12-12-2013 |
20130319201 | Cutting chain for cutting mineral and metal materials - A cuffing chain for cutting mineral and metal materials has central chain links and lateral connecting links. The cutting chain has connecting pins with a central section which has a diameter that is greater than the diameter of openings in adjacent connecting links. The cutting chain has two connecting links which have a supporting section instead of a cutting element. At least two second connecting links positioned adjacent to one another at right angles to the direction of travel of the cutting chain are formed separately from one another. As a result, the cutting chain can be opened for maintenance and repairs despite the use of collar studs as connecting pins. | 12-05-2013 |
20130312267 | Motor Chain Saw with Supply Pump - A motor chain saw has a first driven sprocket wheel driving a saw chain lubricated via a supply pump driven by first and second drive wheel, wherein the second drive wheel is connected to the first sprocket wheel. A drive element with coupling section is connected to the first sprocket wheel and the second drive wheel is formed on the drive element. A second sprocket wheel can be used in place of the first sprocket wheel. The first and second sprocket wheels have different geometries. The coupling section has first and second followers correlated with follower surfaces of the first and second sprocket wheels. The coupling section contacts with first followers the follower surfaces of the first sprocket wheel or with second followers the follower surfaces of the second sprocket wheel when used in place of the first sprocket wheel. | 11-28-2013 |
20130306018 | HAND-HELD WORK IMPLEMENT HAVING AN INTERNAL COMBUSTION ENGINE AND AN AIR FILTER - The application relates to a hand-held working implement comprising an internal combustion engine, an air filter, and an intermediate flange, wherein the intermediate flange is arranged between the air filter and the internal combustion engine, wherein the bottom of the intermediate flange is arranged opposite the air filter bottom, wherein the air filter bottom and the intermediate flange bound an interior space, wherein the interior space comprises a portion of the duct, wherein a portion of the duct in the interior space is bounded by at least one boundary wall which protrudes into the interior space transversely with respect to the air filter bottom, wherein the boundary wall is formed integrally on the intermediate flange and/or on the air filter bottom, and wherein the boundary wall bridges the spacing between the air filter bottom and the bottom of the intermediate flange. | 11-21-2013 |
20130305545 | CHAIN GUARD AND CHAINSAW SYSTEM - The application relates to a chain guard for a chainsaw with interchangeable cutting attachments of different lengths, said cutting attachments having cutting chains, wherein the chain guard comprises an insertion opening for inserting a cutting attachment, at least two side walls for covering lateral surfaces of the cutting attachment, a front end opposite the insertion opening, a first latching depression formed in at least one side wall, and a second latching depression formed in at least one side wall at a distance closer toward the insertion opening with respect to the first latching depression, wherein the first latching depression and the second latching depression each comprise an arcuate latching surface for latching in a form-fitting manner with a cutting chain of the cutting attachment, said latching being active in the direction of a longitudinal axis of the chain guard, and also to a chainsaw system having such a chain guard. | 11-21-2013 |
20130276724 | WORK APPARATUS HAVING A FUEL PUMP - A work apparatus has an internal combustion engine for driving a work tool of the work apparatus and a fuel pump which is driven by the engine and delivers fuel from a fuel tank to the engine. The work apparatus has a feed pump which is to be actuated manually by the operator. The fuel pump and the feed pump form one component which is arranged outside the fuel tank. The fuel tank has a tank wall which delimits the tank interior. An advantageous arrangement arid satisfactory cooling of the component are achieved if the component is arranged at least partially on the tank wall. | 10-24-2013 |
20130270933 | WORK APPARATUS - A work apparatus has a tool which is driven in rotation by a drive motor via a transmission. The drive motor is an electric motor which has a commutator and brushes. The drive motor is arranged in a motor housing and drives an impeller wheel which conveys a cooling airflow for the drive motor. Simple and effective lubrication of the transmission is achieved with the cooling airflow flowing past the commutator and brushes and the transmission is arranged downstream of the commutator in the cooling airflow. The motor housing is formed in a manner closed toward the transmission housing on that end side that faces the transmission housing and is connected to the transmission housing via a flow connection. | 10-17-2013 |
20130269673 | Cutting chain for a hand-operated implement and hand-operated implement - A cutting chain for a hand-operated implement for cutting metal and mineral materials such as a stone cutter has central connecting links which are connected to one another by lateral connecting links. The central connecting links comprise first central connecting links which each have a drive tooth. The cutting chain has two central connecting links with drive teeth shaped differently to the drive teeth on the first central connecting links; or located a different distance from the leading drive teeth; or having no drive teeth. A hand-operated implement for cutting mineral materials has a drive motor which drives the cutting chain around a guide bar by a drive sprocket. The cutting chain is guided round part of the circumference of the drive sprocket and round a nose sprocket on the guide bar. The drive sprocket or nose sprocket have different first and second areas matched to the cutting chain. | 10-17-2013 |
20130263812 | Internal Combustion Engine - An internal combustion engine has a cylinder liner arranged in the cylinder. A piston moves reciprocatingly in a direction of the longitudinal cylinder axis in the cylinder and is guided within the cylinder liner across a section of a movement path of the piston in the cylinder. A combustion chamber disposed in the cylinder is delimited by the piston. In a crankcase, a crankshaft is rotatably supported by a crankshaft bearing, wherein the crankshaft is driven in rotation by the piston about an axis of rotation of the crankshaft. A position of the cylinder liner relative to the crankcase is secured with form fit by a securing element located at an end face of the cylinder liner that is facing the crankcase. No loads are transmitted into the cylinder liner from the crankshaft bearing through the end face of the cylinder liner that is facing the crankcase. | 10-10-2013 |
20130228351 | FURROW CUTTER - A blade for a furrow cutter has a planar fastening region which is located in a fastening plane. The blade is driven in rotation via a transmission arranged in a transmission housing. The fastening plans separates a first region of the furrow cutter from a second region of the furrow cutter. The transmission is arranged in the first region. The blade has at least one arm projecting from the fastening region and having a free end. The arm has a first segment which extends out of the fastening plane into the second region. A simple structure, a good cutting result and a high service life are achieved when the arm has a second segment in which the arm extends back in the direction of the fastening plane. | 09-05-2013 |
20130228350 | WORK APPARATUS - A handheld work apparatus such as a bed redefiner or edger has a handle for guiding the work apparatus over the ground. The apparatus also includes a drive motor which drives a tool in rotation. During operation, the apparatus is moved over the ground by the operator in a direction of movement. The tool is covered at least partially by a protective hood and a sliding skid is arranged on that end of the protective hood located at the front in the direction of movement. The sliding skid has an abutment surface for a flexible spray guard fixed to the protective hood. The spray guard is fastened to the protective hood in its fastening region located at the front viewed in the direction of movement. The spray guard is movable in its protective region located at the rear viewed in the direction of movement. | 09-05-2013 |
20130200837 | METHOD FOR OPERATING A WORK APPARATUS HAVING AN ELECTRIC MOTOR AND WORK APPARATUS HAVING AN ELECTRIC MOTOR - An electric motor in a work apparatus has a power characteristic line which runs between a lower rotational speed of the electric motor and an upper rotational speed of the electric motor. The power characteristic line has a power characteristic with a pronounced maximum (M) and an operating plateau (AP) which lies in a working rotational speed range (AD) of the work apparatus. A method for operating the electric motor provides for configuring the position of the operating plateau (AP) to be variable with respect to the rotational speed of the electric motor to achieve stable operating points over a wide rotational speed range. | 08-08-2013 |
20130199812 | HANDHELD WORK APPARATUS - A handheld work apparatus has a combustion engine ( | 08-08-2013 |
20130185946 | CUTTER HEAD OF A MANUALLY GUIDED IMPLEMENT - A cutter head of an implement, comprising a cutting blade rotatabiy drivable about an axis of rotation and provided with at least two blade wings that extend along a longitudinal axis in a radial direction relative to the axis of rotation. The cutting blade is clamped between two contact or pressure pieces, at least one of which is provided with at least one radially extending dampening projection that rests against at least one of the blade wings and has a longitudinal axis that is angularly offset relative to the longitudinal axis of the blade wing. A protection against rotation that acts in at least one direction of rotation is provided between cutting blade and the contact or pressure piece that is provided with the at least one radially extending dampening projection. The protection against rotation is in the form of a positive connection between the angularly offset dampening projection and an outer edge of an associated blade wing. | 07-25-2013 |
20130164600 | RECHARGEABLE BATTERY PACK FOR AN ELECTRICAL LOAD - The invention is directed to a rechargeable battery pack for an electrical load with the load being connected to the rechargeable battery pack by a connection cable. A housing of the rechargeable battery pack has an inner space for accommodating a large number of rechargeable individual cells which are electrically connected to one another and supply the load via the connection cable. To provide the housing with a high level of stability, provision is made for the receiving space in the housing to be subdivided into individual receptacles by partition walls. A cell pack includes a predefined number of the individual cells and is arranged in a corresponding individual receptacle. Each cell pack forms an independent unit which is held in the individual receptacle. The individual cells of a cell pack are electrically and mechanically connected to one another by cell connectors. | 06-27-2013 |
20130163135 | PROTECTIVE CIRCUIT FOR A RECHARGEABLE BATTERY PACK - A protective circuit for an arrangement includes a multiplicity of individual cells in a rechargeable battery pack. A predefined number of individual cells are connected in series in a cell row and at least two cell rows are mutually parallel, and at least one cell connector situated between the individual cells at a location of one cell row is electrically connected via a compensation line to the cell connector situated at an identical location of the parallel cell row, and the potential of the cell connector connected to the compensation line at one location of one cell row and the potential of the cell connector electrically connected to the compensation line at the same location of the parallel cell row are detected and the detected potentials are fed to an evaluation unit. | 06-27-2013 |
20130162217 | PROTECTIVE CIRCUIT FOR A RECHARGEABLE BATTERY PACK - The invention is directed to a protective circuit for a multiplicity of individual Cells arranged in a rechargeable battery pack, wherein a predefined number of individual cells forms a cell network. A monitoring circuit for the state of charge of the individual cells in the cell network is provided. Wherein the voltage at an individual cell is detected and the detected voltages of a plurality of individual cells are compared among one another to output a signal when an unbalancing limit is exceeded unbalancing limit indicates a permissible voltage difference between two selected individual cells of the cell network. The unbalancing limit of the cell network is provided as a characteristic curve variable over its state of charge. To alter the unbalancing limit, the characteristic curve is altered in dependence on a correction value. | 06-27-2013 |
20130162055 | ELECTRIC WORK APPARATUS WITH AN ELECTRIC LOAD AND A RECHARGEABLE BATTERY PACK - An electric work apparatus having an electric load which is fed from a rechargeable battery pack. The battery pack is accommodated in a housing with the electric load being connected to the battery pack via an electric connecting cable. To provide cable guidance for the connecting cable that is ergonomically suitable for a user, cable ducts are molded in a housing wall of the backpack-type battery pack that is separate from the electric load. The cable duct opens in the edge of the housing as cable outlets. | 06-27-2013 |
20130162052 | PROTECTIVE CIRCUIT FOR A RECHARGEABLE BATTERY PACK - A protective circuit for an arrangement which includes a plurality of individual cells in a rechargeable battery pack with a predefined number of individual cells being connected in series in a cell row and at least two cell rows being situated parallel to one another. The component current flowing in a first cell row when the rechargeable battery pack is subject to loading is compared with the component current flowing in a second cell row to generate a signal when there is an implausible deviation in the component currents with respect to one smother. The signal is used to disconnect a defective cell row or to switch off the entire rechargeable battery pack in order to protect the latter. | 06-27-2013 |
20130160751 | METHOD FOR OPERATING AN INTERNAL COMBUSTION ENGINE - An internal combustion engine has a cylinder in which a combustion chamber, bounded on one side by a reciprocating piston, is formed. The piston drives a crankshaft rotatably mounted in a crank casing. The internal combustion engine has an inlet opening for combustion air into the crank casing, and an outlet opening out of the combustion chamber. The internal combustion engine has at least one overflow duct which connects the crank casing interior to the combustion chamber. The internal combustion engine has a crank casing pressure sensor for measuring the crank casing pressure, a device for determining the rotational position of the crankshaft, and an evaluation device which evaluates the measurements of the crank casing pressure sensor. A method for operating the internal combustion engine is provided where the ambient pressure is determined using the crank casing pressure measured by the crank casing pressure sensor. | 06-27-2013 |
20130151126 | DEVICE AND METHOD FOR OPERATING A HAND-HELD WORKING APPARATUS - A hand-held working apparatus has an internal combustion engine having a crankshaft which is driven in rotation. The crankshaft drives at least one tool of the working apparatus via a centrifugal clutch. The working apparatus has a device for determining the speed of the internal combustion engine and a control device which controls the internal combustion engine. It is provided that the profile of the speed of the internal combustion engine is evaluated by the control device, and that the engagement speed of the centrifugal clutch is determined from the profile of the speed of the internal combustion engine. A method of operation is also provided. | 06-13-2013 |
20130146040 | IGNITION CIRCUIT - An ignition circuit for a combustion engine has an ignition coil and a control unit for the coil. The coil and the control unit are included in a common component as an ignition module. The module is supplied with voltage by a generator driven by the engine. A spark plug and the coil form a power circuit which includes a line segment to a reference potential outside the module. A sensor detects data of the engine and the output of the sensor is supplied to the module. The sensor is supplied with voltage via a sensor circuit. The sensor circuit and the power circuit use the line segment as a common connection to the reference potential, so that for a defect of the line segment, a missing connection to the reference potential in the high voltage circuit is recognized via the change of the sensor output signals. | 06-13-2013 |
20130146028 | Internal combustion engine with fuel supply device - An internal combustion engine has a fuel supply device, wherein the fuel supply device includes a fuel pump, a fuel pressure damper, an injection valve, and a fuel pressure regulator. The fuel pressure damper has a damper membrane separating a damper chamber and a damper back chamber from each other. The damper chamber of the fuel pressure damper is loaded with a first reference pressure. The fuel pressure regulator regulates a pressure of fuel supplied by the fuel pump to the injection valve based on a second reference pressure of the fuel pressure regulator. The first reference pressure and the second reference pressure are adjusted relative to each other. | 06-13-2013 |
20130145825 | METHOD FOR LEAK-TESTING AND DEVICE FOR CARRYING OUT THE METHOD - A method for leak-testing a fuel supply system has been provided, wherein the fuel supply system comprises a fuel tank, a fuel injection valve, fuel lines between the fuel tank and the fuel valve, and a control valve controlled by a diaphragm, and wherein the diaphragm bounds a control chamber on one side, the method comprising: acting upon the portion of the fuel supply system upstream of the control valve with a predetermined pressure level, acting upon the side of the diaphragm facing away from the control chamber with a counterforce, wherein the counterforce is equal or greater to the predetermined pressure level. A device for leak-testing a fuel system according to the above method, wherein the device comprises a test pressure unit with at least one test pressure line, wherein said test pressure line is connectable to the fuel supply system. | 06-13-2013 |
20130133620 | HANDHELD WORK APPARATUS AND SUCTION HEAD FOR CONNECTION TO A FUEL LINE IN A HANDHELD WORK APPARATUS - A handheld work apparatus includes a fuel tank ( | 05-30-2013 |
20130112180 | IGNITION DEVICE FOR A TWO-STROKE ENGINE - The invention relates to an ignition device for triggering an ignition spark at a spark plug by way of an ignition generator. The latter includes a magnet wheel, which has two permanent magnets arranged at a spacing from each other in the peripheral direction and a magnetic yoke. The magnetic yoke carries a charging coil which charges an ignition capacitor, a primary coil and a secondary coil, connected, to the spark plug. During every passing of a permanent magnet, a voltage is induced in the coils, wherein, in order to trigger the ignition spark, the ignition capacitor is discharged via a switch element. In order to avoid an unwanted ignition at the bottom dead center of the piston, a device for reducing the voltage that occurs at the spark plug is provided. | 05-09-2013 |
20130091715 | HANDHELD WORK APPARATUS HAVING A GUARD - A handheld work apparatus such as a stone cutter ( | 04-18-2013 |
20120297631 | WORKING APPARATUS AND A METHOD FOR OPERATING SAME - A working apparatus has an internal combustion engine which drives at least one tool via a clutch. The clutch starts the coupling process at an initial engagement speed when the internal combustion engine is accelerated. The internal combustion engine has a piston, an ignition device and an ignition timing control device. The control device provides a first ignition timing for idling and a second ignition timing for full load operation, which is earlier than the first ignition timing. A method for operating the working apparatus provides that the ignition timing is adjusted toward “late,” with respect to the first ignition timing, when the engine speed drops in a first speed range above the idling speed and below the initial engagement speed. | 11-29-2012 |
20120261444 | Arrangement of Power Tool and Carrying System - In an arrangement of a power tool and a carrying system, the carrying system has a support strap and a releasable fastening device for attaching the power tool to the support strap. The carrying system has an actuating device that actuates the releasable fastening device from a fastening position into a release position. The fastening device has a pivotable hook that in the fastening position is hooked to an eye and secures the power tool on the carrying system. When the carrying system is arranged on a user and the power tool is secured on the carrying system and the fastening device is actuated from the fastening position into the release position, the hook is pivoted such that the eye slides out of the hook because of the weight of the power tool. | 10-18-2012 |
20120234572 | Hand-Held Power Tool - A hand-held power tool has a power tool housing made at least partially of plastic material. A drive motor is arranged in the power tool housing and a drive shaft driven connected to the drive motor is provided. A tool member is connected to the drive shaft and driven by the drive motor through the drive shaft. A first bearing rotatably supports the drive shaft relative to the power tool housing. An intermediate element supports the first bearing relative to the power tool housing. The intermediate element is arranged in a receptacle of the power tool housing and is supported on a support surface relative to the bottom of the receptacle. The support surface is less than approximately 50% of an imaginary circular ring surface defined between an outer circumference of the first bearing and the circumcircle of the receptacle. | 09-20-2012 |
20120234412 | Blower Apparatus - A blower apparatus has a drive motor and a blower device operatively connected to the drive motor. A blower tube is connected to the blower device and has an outlet opening remote from the blower device. A blower air stream conveyed by the blower device passes through the blower tube in the direction of a longitudinal center axis of the blower tube and exits through the outlet opening in an outflow direction. A pivoting device that pivots the blower tube is provided. In a non-actuated state of the pivoting device the outflow direction is parallel to the longitudinal center axis of the blower tube. The pivoting device has a tilting device that tilts the outflow direction relative to the longitudinal center axis of the blower tube and utilizes a transverse force that is generated by the blower air stream at the outlet opening for pivoting the blower tube. | 09-20-2012 |
20120211248 | Hand-Held Power Tool - A hand-held power tool has a housing with a cylinder chamber. An internal combustion engine is arranged in the housing and the internal combustion engine has a cylinder arranged in the cylinder chamber. A device is provided that detects temperature information in the cylinder chamber when the internal combustion engine is in an inoperative state. An indicator device that indicates the temperature information is provided. | 08-23-2012 |
20120146250 | Adjustment Safeguard - An adjustment safeguard for a set screw that is rotatably held in a housing has a cap that is non-rotatably secured on the head of the set screw. The cap is received in a sleeve of the housing and surrounded with minimal radial play by the sleeve that is essentially coaxially positioned relative to the cap. The cap is received with its axial length in the sleeve. The cap has a projection and the sleeve has a stop arranged in the interior of the sleeve. Projection and stop interact with each other in a rotational direction of the set screw. The cap has a top part and a separate bottom part. The bottom part is secured axially and non-rotatably on the head of the set screw. The bottom part engages with form fit the top part in the rotational direction and is axially connected to the top part. | 06-14-2012 |
20120091599 | Carburetor - A carburetor has a throttle element rotatably supported on a throttle shaft and a choke element rotatably supported on a choke shaft. A first coupling element is fixedly connected to the throttle shaft. A second coupling element is connected to the choke shaft. The first and second coupling elements define in a locked position a start position of throttle element and choke element. The locked position is released by rotation of the throttle shaft in opening direction of the throttle element. The locked position is released by rotation of the choke shaft in opening direction of the choke element. One of the first and second coupling elements is an at least partially elastic coupling element. Upon rotation of the choke shaft from the locked position into an open position, the elastic coupling element is elastically deformed and releases the locked position between the first and second coupling elements. | 04-19-2012 |
20120060806 | Two-Stroke Engine - A two-stroke engine has a cylinder having a cylinder bore with a combustion chamber and an outlet connected with the combustion chamber. A piston is disposed in the cylinder and delimits the combustion chamber. The piston has a piston recess. A crankcase is provided that has a crankshaft rotatably supported therein. The piston drives in rotation the crankshaft. In at least one position of the piston, the crankcase is connected by a transfer passage with the combustion chamber. An air passage is provided as well as a mixture passage that has a mixture inlet that is disposed at the cylinder bore and opens into the cylinder bore and is piston-controlled. The transfer passage is connected by the piston recess to the air passage when the piston is at top dead center. The piston recess has a connection to the mixture inlet in at least one position of the piston. | 03-15-2012 |
20120060381 | Hand-Held Power Tool - A hand-held power tool has a two-stroke engine with a cylinder with combustion chamber and a piston disposed therein that drives a crankshaft supported in a crankcase. In at least one piston position, crankcase and combustion chamber are connected by a transfer passage. An air passage supplies in at least one piston position combustion air to the transfer passage. A mixture passage for fuel/air mixture is provided. Air and mixture passages in operation are at least partially connected to each other. Part of the mixture passage is formed in a carburetor where a fuel port opens into the mixture passage. The mixture passage opens into the crankcase with a piston-controlled mixture inlet having a width in circumferential direction of the cylinder. Upon upward piston stroke the mixture inlet is connected to the crankcase with a portion of the width before a connection of air passage and transfer passage is established. | 03-15-2012 |
20120036722 | Hand-Held Power Tool - In a hand-held power tool with a drive motor and a clutch connected to the drive motor and having an output part, the drive pinion is fixedly connected to the output part of the clutch so as to be driven by the drive motor for driving a tool. The drive pinion has a first individual part and a second individual part that are fixedly connected to each other. The first individual part has a toothing and the second individual part is connected to the output part of the clutch. | 02-16-2012 |
20110241457 | Hand-Held Power Tool - A hand-held power tool has a tool member and a motor drivingly connected to the tool member, wherein the motor is arranged in a motor housing. A battery for driving the tool member is provided. A guide shaft has arranged on its first end the battery and on its second end the motor housing and the tool member. A rotatably power output part arranged on the motor housing is drivingly connected to the motor. The power output part supports the tool member. Cooling air is sucked through the guide shaft into the motor housing. Between the power output part and the motor housing an annular air exit gap is formed through which the cooling air exits the motor housing. At least one guide vane that projects into the annular air exit gap is provided. | 10-06-2011 |
20110198182 | Coupling Device Actuated by Centrifugal Force - A coupling device actuated by centrifugal force has a holder and at least one flyweight supported on the holder so as to be moveable in a radial direction relative to an axis of rotation about which the coupling device is rotatable. The flyweight is movable between an inner radial position and an outer radial position. At least one spring acting on the flyweight is provided that forces the flyweight into the inner radial position. At least one securing element secures at least one component of the coupling device in an axial direction of the axis of rotation. The securing element is monolithically formed on the flyweight. | 08-18-2011 |
20110197458 | Power Tool with an Indicator - A power tool is provided with an indicator with a light source for generating a marking. A holding device is secured on the power tool by positive fit. The indicator is releasably secured on the holding device, wherein the holding device is secured to a grip pipe. The holding device has a geometry that is matched to the geometry of the grip pipe such that the holding device is securable in only one position on the grip pipe. | 08-18-2011 |
20110146643 | Two-Stroke Engine - A two-stroke engine has a cylinder with a combustion chamber and a piston reciprocatingly supported in the cylinder. A crankshaft is rotatably supported in a crankcase and driven by the piston. At least one transfer passage connects the crankcase in at least one position of the piston with the combustion chamber and has a piston-controlled transfer port that opens into the combustion chamber and an opening that opens into the crankcase. A mixture inlet opens into the crankcase. An outlet is provided at the combustion chamber. The transfer port and the opening are displaced relative to each other in a circumferential direction of the cylinder. At least one wall section of the transfer passage forms an undercut when viewed from the crankcase in a direction of a longitudinal cylinder axis of the cylinder and is delimited by a separate component inserted into the cylinder from a side facing the crankcase. | 06-23-2011 |
20110146642 | Two-Stroke Engine, Sand Core for Producing a Two-Stroke Engine, and Method for Operating a Two-Stroke Engine - A two-stroke engine has a cylinder with a combustion chamber and a reciprocating piston for driving a crankshaft. Transfer passages connect the crankcase in at least one position of the piston with the combustion chamber and open by piston-controlled transfer ports into the combustion chamber. An inlet opens into the crankcase and an outlet is provided at the combustion chamber. The engine is dividable into four sectors parallel to a longitudinal cylinder axis. The transfer port of a first transfer passage is arranged in the first sector, the outlet is arranged in the second sector, the transfer port of a second transfer passage is provided in the third sector, and the inlet is arranged in the fourth sector. Within the cylinder the first and second transfer passages, at a spacing from a separation plane between cylinder and crankcase, pass together into one of the second and fourth sectors. | 06-23-2011 |
20110146641 | Internal Combustion Engine - An internal combustion engine has a cylinder with cylinder liner and a reciprocatingly supported piston delimiting a combustion chamber and driving in rotation a crankshaft in a crankcase. A device for supplying fuel and combustion air is provided. At least one transfer passage connects in at least one piston position the crankcase interior with the combustion chamber. The transfer passage has a transfer port that opens into the combustion chamber and an opening that opens into the crankcase. Opening and transfer port are displaced relative to each other in circumferential direction of the cylinder. The cylinder liner has at least one segment of a piston bearing surface and forms at least one wall section of the transfer passage. The cylinder has an upper cylinder segment and a lower cylinder segment that are separately embodied. The cylinder liner is separate from the upper and lower cylinder segments. | 06-23-2011 |
20110146611 | Method and Device for Providing Electric Energy for an Engine Control Unit - In a method for providing in a hand-held power tool electric energy for an engine control unit before start of an internal combustion engine of the power tool that is to be started by a rope starter, a voltage source is provided that generates electric energy electro-dynamically or photovoltaically before starting the internal combustion engine. The thus generated electric energy is stored in a rechargeable energy storage device arranged within the power tool. The electric energy stored in the energy storage device is supplied to the engine control unit upon first rope starter pull for start of the internal combustion engine. The device for performing the method has an electro-dynamic or photovoltaic voltage source and an energy storage device electrically conductingly connected to the voltage source, wherein the energy storage device has an output that is electrically conductingly connected to the engine control unit. | 06-23-2011 |
20110140707 | Method for Operating a Power Tool with a Diagnostic Device - In a method for operating a power tool with a diagnostic device, wherein the power tool has an internal combustion engine, a generator as an energy supply, and an electronic control unit, wherein a diagnostic device is connectable to the electronic control unit, and wherein the electronic control unit has an operating mode and a diagnostic mode, a non-uniform voltage signal is supplied by the generator as an energy supply and a uniform voltage signal is supplied by the diagnostic device as an energy supply. The electronic control unit evaluates the voltage signal that is being supplied as an energy supply and switches to diagnostic mode when the voltage signal is the uniform voltage signal supplied by the diagnostic device. | 06-16-2011 |
20110098399 | Cutting Filament for a Trimmer and Method of Producing Such a Cutting Filament - A cutting filament for a manually-guided trimmer, and a method of producing such a filament. A polymeric material is filled with platelet-shaped particles. The filled polymeric material is extruded in the form of a filament blank. In the solidified state, the filament blank is spun in the direction of its longitudinal axis, accompanied by plastic deformation, in such a way that the embedded particles are oriented at least predominantly in the direction of the longitudinal axis. | 04-28-2011 |
20110094762 | Electric Power Tool with Communication Line to Battery Pack - An electric power tool has a drive motor and an electronic control unit. Power is supplied by a battery pack with several individual cells and a monitoring circuit for the operating parameters of the cells. A communication line connects electronic control unit and monitoring circuit. Digital data are exchanged through the communication line between electronic control unit and monitoring circuit. A controller controls data traffic through sending and receiving units. The communication voltage is higher than a permissible input voltage level of the controller and lower than a maximum battery pack voltage. The receiving unit, as a filter, converts a received first signal level that is lower than a first voltage to a LOW signal and lowers a received second signal level that is higher than a second voltage to the input voltage level of the controller and relays the second signal level as a HIGH signal. | 04-28-2011 |
20110086528 | Spark Plug Socket - A spark plug socket has an elastic base member and a contact element secured in the base member. The base member has a spark plug receptacle for a spark plug and the contact element has a contact receptacle for a terminal of the spark plug. The spark plug socket is removable in a removing direction from the spark plug. In an unloaded state of the spark plug socket arranged on the spark plug, a section of the contact receptacle engages behind the terminal of the spark plug in the removing direction of the spark plug socket. A longitudinal center axis of the contact receptacle is slanted relative to a longitudinal center axis of the spark plug receptacle. The contact element is adjustable against an elasticity of the base member such that an angle between the longitudinal center axis of the contact receptacle and the longitudinal center axis of the spark plug receptacle is reduced. | 04-14-2011 |
20110068487 | Carburetor - A carburetor has a housing and an intake passage section disposed in the housing. A throttle element is arranged in the intake passage section and a choke element is arranged in the intake passage section upstream of the throttle element. At least one fuel opening opens downstream of the choke element into the intake passage section. A fuel valve controls a fuel quantity supplied to the at least one fuel opening. At least one auxiliary fuel port opens upstream of the choke element into the intake passage section. | 03-24-2011 |
20110056451 | Method for Operating an Internal Combustion Engine - In a method for operating an internal combustion engine that has a starter device for starting the internal combustion engine and a device for supplying fuel controlled by a control device, it is determined whether cold start conditions or hot start conditions exist during starting of the internal combustion engine. In at least one operating range, during starting of the internal combustion engine, an engine speed gradient is determined during a slowdown phase of a pull stroke of a starter device and the engine speed gradient is used for determining whether cold start conditions or hot start conditions exist. The fuel quantity to be supplied to the internal combustion engine is controlled based on the determined cold start conditions or hot start conditions. | 03-10-2011 |
20110010952 | Guide Bar for the Saw Chain of a Power Saw - A guide bar for the saw chain of a power saw, including an elongated, planar main body having an outer periphery that is provided with a guide groove for guiding a saw chain. A direction-changing section is disposed at a free end of the guide bar and includes two side plates. At least one rivet is provided for securing the side plates to the main body, with the rivet extending through an opening in the main body. On at least one side of the main body, the opening is provided with a flared depression for receiving an adjacent element. | 01-20-2011 |
20110004395 | Method for Operating an Internal Combustion Engine - In a method for operating an internal combustion engine for adjusting a desired fuel/air mixture, wherein the rotary speed is determined by an operating curve based on a fuel/air mixture composition, wherein the operating curve has ascending and descending branches and a maximum, wherein a lambda value is smaller than 1 on the descending branch, it is first determined by statistic evaluation whether the operating point is on the ascending or descending branch. In a second method step, when the operating point is not on a desired branch of the operating curve desired as a starting point for a third method step, at least one operating parameter is changed until the operating point is positioned on the desired branch. In a third method step, the maximum of the operating curve is determined. Based on the determined maximum, the desired operating point of the internal combustion engine is then adjusted. | 01-06-2011 |
20110000462 | Method for Operating an Internal Combustion Engine - For operating an internal combustion engine with a combustion chamber delimited by a piston driving a crankshaft in a crankcase, with a device for supplying fuel, an ignition device, and an electronic control unit, wherein a correlation between a power output of the internal combustion engine and a lambda value in the combustion chamber is defined by a power output curve that has a first ascending branch, a maximum, and a second descending branch where the lambda value is smaller than 1, the position of an operating point of the internal combustion engine is determined by adjusting the ignition timing to an adjusted ignition timing and evaluating the engine speed reaction caused by the adjusted ignition timing. The supplied fuel quantity is changed as a function of the determined position of the operating point when the determined position of the operating point is not a desired operating point. | 01-06-2011 |
20100326412 | Carburetor and Two-Stroke Engine with a Carburetor - A carburetor has a carburetor housing in which an air passage and a mixture passage are disposed. A barrel valve controls the air passage and the mixture passage. The barrel valve has a mixture passage section and an air passage section formed therein. The air passage in at least one position of the barrel valve is closed off at least partially by the barrel valve. The air passage in the at least one position of the barrel valve in which the air passage is at least partially closed off by the barrel valve is connected by a connection within the barrel valve with the mixture passage. An internal combustion engine equipped with such a carburetor exhibits excellent running behavior. | 12-30-2010 |
20100283161 | Carburetor for an Internal Combustion Engine - A carburetor for an internal combustion engine has a carburetor housing and a mixture forming passage provided in the carburetor housing. A throttle and a choke valve are rotatably arranged in the mixture forming passage on a throttle shaft and a choke shaft, respectively. A lever arrangement has a throttle adjusting lever mounted on the throttle shaft and a choke adjusting lever mounted on the choke shaft. The throttle valve and the choke valve are adjustable in several operating positions and the lever arrangement assumes appropriate positions corresponding to the operational positions, respectively. A release device for releasing a locking action between the throttle adjusting lever and the choke adjusting lever when an emergency stop is actuated is provided. A spring forcing the choke adjusting lever in a direction toward an engagement plane with the throttle adjusting lever. | 11-11-2010 |
20100242904 | Internal Combustion Engine - An internal combustion engine having an intake channel that is divided by a partition into an air duct and a mixture duct. The partition has a connecting opening that at least at full throttle of the internal combustion engine is substantially closed. A main fuel opening opens out into the mixture duct. At least one further fuel opening is provided that opens out into the mixture duct at a first distance relative to the wall of the intake channel and at a second distance relative to the partition. | 09-30-2010 |
20100229403 | Cutter Head of a Manually Guided Implement - A cutter head of an implement, comprising a cutting blade rotatably drivable about an axis of rotation. The cutting blade is provided with at least two blade wings that extend along a longitudinal axis in a radial direction relative to the axis of rotation. The cutting blade is clamped between two contact or pressure pieces, at least one of which is provided with at least one radially extending dampening projection that rests against at least one of the blade wings. | 09-16-2010 |
20100221594 | Portable Hand-Guided Electric Device with Battery Pack - A hand-held electric device has a device housing with a battery pack compartment. A battery pack is disposed in the battery pack compartment. The battery pack compartment has guide elements extending in the insertion direction of the battery pack. The battery pack has a battery pack housing and guide sections provided on the battery pack housing that interact with the guide elements. The battery pack has an electric connector head disposed on the battery pack housing. The battery pack compartment has contact elements. In a predetermined insertion position of the battery pack in the battery pack compartment the contact elements electrically contact the connector head. A contact plate is floatingly supported in the battery pack compartment and the contact elements are disposed on the contact plate. | 09-02-2010 |
20100221591 | Battery Pack for a Hand-Guided Power Tool - An exchangeable battery pack for an electric device has a housing with a first end face and a second end face opposite the first end face, wherein the first end is open. A housing cover closes off the first end face. Battery cells are disposed in the housing. Cell connectors electrically connect the cells with one another. An external electrical connector is disposed on the second end face. All of the battery cells are connected to the external electrical connector. The battery cells are charged and discharged through the external electrical connector. A cell holder secures several of the battery cells. An inner positional securing element is provided on an inner side of a sidewall of the housing and the cell holder interacts with the positional securing element. | 09-02-2010 |
20100221590 | Battery Pack for an Electric Power Tool - A battery pack for an electric power tool has at least one cell arrangement with a plurality of individual battery cells that are arranged such in a predetermined total number of battery cells upright adjacent to one another for forming a cell container that cell axes of the battery cells are approximately perpendicular to a common reference plane. Cell connectors electrically conductingly connect cell ends of the battery cells. The battery cells of the cell container include a core cell and neighboring cells surrounding the core cell. Points of intersection of the cell axes of all of the neighboring cells with the reference plane are positioned on a closed, approximately elliptical curve. A number of neighboring cells is greater than one third of the total number of the battery cells of cell container. | 09-02-2010 |
20100221584 | Battery Pack with Electronic Monitoring Device Integrated in the Housing Cover - A battery pack for an electric power tool has a housing and a housing cover that closes off the housing. Battery cells are arranged in the housing and electrically conductingly connected to one another. An electronic circuit for monitoring operating parameters of the battery cells is provided wherein the electronic circuit is mounted on a circuit board and is arranged in the housing. The housing cover has an inner side facing the battery cells. The inner side has a receptacle that is delimited by an outer receptacle rim. The circuit board is received in the receptacle and is spaced from a bottom of the receptacle so that a filling space is provided between circuit board, bottom of the receptacle, and the receptacle rim. A cured potting compound fills out the filling space. | 09-02-2010 |
20100219837 | Method and Device for Measuring Cell Voltages in a Plurality of Series-Connected Accumulator Cells - The invention relates to a method and a device for measuring cell voltages of accumulator cells (Z | 09-02-2010 |
20100218967 | Electric Power Tool with Battery Pack - An electric power tool has a device housing with a rear grip extending in the longitudinal direction of the device housing. The device housing has first opposed housing sides and second opposed housing sides. An electric drive motor and its electronic control are arranged in the device housing. A battery pack compartment arranged in the device housing receives a battery pack that has a parallelepipedal shape and extends in a direction of a height axis, width axis and depth axis. The battery pack is arranged such that the width axis and the height axis extend transversely to the longitudinal axis of the device housing. The battery pack has narrow sides extending approximately parallel and at a minimal spacing relative to the first opposed housing sides, respectively. The battery pack has opposed end faces neighboring the second housing sides, respectively. | 09-02-2010 |
20100218966 | Battery Pack-Operated Hand-Guided Power Tool with Throttle Lever - A hand-held power tool has a device housing and at least one grip disposed on the device housing. An electric drive motor is arranged in the device housing for operating a working tool. A battery pack provides electric energy for operating the electric drive motor. An electronic control unit is connected to the electric drive motor and the battery pack. An operating element disposed on the grip controls the electric drive motor. An electric actuator is acted upon by the operating element and the output signal of the electric actuator is supplied to the electronic control unit. Electric energy is applied to the electric drive motor by the electronic control unit as a function of a position of the operating element, wherein in a first dead travel range of the operating element that adjoins an inoperative position of the operating element the supplied electric energy is zero. | 09-02-2010 |
20100218386 | Battery Pack-Operated Hand-Held Power Tool - A hand-held power tool has a device housing having a battery pack compartment. An electric drive motor is arranged in the device housing. An output for driving a working tool is connected to the electric drive motor and arranged in the device housing. A battery pack is arranged in the battery pack compartment and is substantially received completely in the battery pack compartment. At least one grip for guiding the power tool is provided. The device housing has a housing volume and the battery pack compartment has a compartment volume located inside the device housing. A ratio of the housing volume to the compartment volume is approximately 1.5 to maximally io approximately 5. | 09-02-2010 |
20100218385 | Battery-Operated Hand-Held Electric Device - A hand-guided electric device has an electric motor for driving a tool. The electric motor has a motor housing with inlet and outlet for cooling air. A blower wheel is driven by the electric motor and cooling air is conveyed into the motor housing with the blower wheel through the inlet and blown out from the motor housing through the outlet. The device housing has a cooling air inlet chamber and a cooling air outlet chamber. The cooling air enters the inlet chamber through a cooling air inlet port in an exterior housing wall of the device housing and exits from the outlet chamber through a cooling air outlet port in the exterior housing wall. The cooling air inlet and outlet chambers are separated from one another substantially air-tightly by an inner housing wall so that motor housing is the only flow connection between inlet and outlet chambers. | 09-02-2010 |
20100154227 | Hedge Trimmer - A hedge trimmer having a drive motor, a gear mechanism, and a blade arrangement with at least one cutter bar, which is driven in a reciprocating manner by the drive motor via the gear mechanism in a longitudinal direction. The blade arrangement includes a guide mechanism that extends over at least a part of the length of the blade arrangement. The guide mechanism is embodied as a molded part that includes a generally flat fastening portion and a profiled guide portion. The cutter bar is longitudinally movably held on the guide portion. | 06-24-2010 |
20100154226 | Hedge Trimmer - A hedge trimmer having a rear handle, a tubular handle and a blade arrangement with at least one cutter bar disposed in a cutter bar plane. An internal combustion engine drives the cutter bars in a reciprocating manner, and has a combustion chamber and a crankshaft mounted in a crankcase so as to be rotatable about an axis of rotation. The combustion chamber faces the rear handle, and the crankcase faces the blade arrangement. The blade arrangement has a longitudinal central axis, and the hedge trimmer has a longitudinal plane that is disposed parallel to the axis of rotation of the crankshaft and transverse to the cutter bar plane. The longitudinal central axis of the blade arrangement lies in the longitudinal plane of the hedge trimmer. | 06-24-2010 |
20100146796 | Power Tool - A power tool has a drive motor and first and second tool members driven reciprocatingly by the drive motor in opposite directions, respectively. The first tool member is driven by a first connecting rod and the first connecting rod is connected to the first tool member by a first pivot joint arranged on the first connecting rod. The second tool member is driven by a second connecting rod and the second connecting rod is connected to the second tool member by a second pivot joint arranged on the second connecting rod. The first pivot joint is arranged on an end of the first connecting rod which end is facing the tool members. The second pivot joint is arranged on an end of the second connecting rod which end is facing away from the tool members. | 06-17-2010 |
20100122674 | Cooling Air Passage for a Motor Chain Saw - A motor chain saw has a motor housing with a drive unit for driving a saw chain on a guide bar. The drive unit is an internal combustion engine with a cylinder and a crankshaft extending transversely to a longitudinal axis of the motor chain saw. A drive pinion is mounted on a first end of the crankshaft. A cooling air blower with a blower wheel is mounted on the second end of the crankshaft. A cooling air stream of the blower flows transversely to the longitudinal axis of the motor chain saw about the cylinder and exits through a housing opening. A hand guard arranged between a handle and a front end of the guide bar is connected with one leg near the housing opening for the cooling air stream. In front of the housing opening a baffle element is supported on the leg of the hand guard. | 05-20-2010 |
20100101523 | Method and Device for Priming a Fuel Metering Device - In a method for priming a fuel metering device for an internal combustion engine with a piston arranged in a combustion chamber and driving a crankshaft that is rotatably supported in a crankcase, with a fuel pump that conveys fuel from a fuel tank to a metering valve that opens into a metering chamber at alternating operating pressure, and with a control unit that calculates and controls timing for the metering valve for metering a fuel quantity corresponding to a load situation of the internal combustion engine, the metering valve is kept open, independent of the calculated timing for the metering valve, for a priming duration in a starting phase of the internal combustion engine when the alternating operating pressure of the metering chamber at the mouth of the metering valve is negative and when a fuel system pressure in the fuel metering device is below a target pressure. | 04-29-2010 |
20100071925 | Hand-Held Power Tool - A hand-held power tool has a motor housing with drive motor and a grip housing with a longitudinal support and a forward grip. The motor housing and the grip housing are connected to one another by antivibration elements. The forward grip has a connecting end that is connected by a screw connection to the longitudinal support. The screw connection has at least one fastening screw that is positioned in the operating position of the power tool in a vertical direction of the power tool. The screw connection has a metal insertion part that is positioned entirely within the contour of the longitudinal support that is a plastic part. The metal insertion part has a screw receptacle for the at least one fastening screw. The at least one fastening screw is fixedly screwed into the metal insertion part. | 03-25-2010 |
20090283286 | Power Tool - A power tool with a drive motor and a drive belt guided about a drive pulley and an output pulley has a tool driven by the drive motor through the drive belt. A tensioning device is provided that changes a spacing between the drive pulley and the output pulley and has at least one tensioning position and at least one release position. In the at least one tensioning position, the drive pulley and the output pulley have a first spacing relative to one another and in the at least one release position have a second spacing to one another that is smaller than the first spacing. The drive belt is an elast belt and the tensioning device, as a result of inherent tension of the elast belt, is secured in the at least one tensioning position. | 11-19-2009 |
20090277078 | Fuel Composition - A fuel composition contains at least 74% by volume of C4 to C14 isoalkanes and, pursuant to the determination of the distillation characteristics according to DIN EN ISO 3405, at least 25% by volume of the fuel composition evaporate at temperatures above 110° C. The fuel composition can also contain oxygen-containing organic compounds, aromatic compounds, olefins, and naphthenes. | 11-12-2009 |
20090260135 | Protective Headgear Combination - A protective headgear combination has a helmet and at least one ear defender secured on the helmet rotational position of the at least one ear defender relative to the helmet is adjustable about a first axis of rotation, wherein the first axis of rotation is positioned relative to the vertical at an angle of less than 45° for an upright head position of a user of the protective headgear combination. | 10-22-2009 |
20090193669 | Hand-Guided Power Tool - A hand-guided power tool has a drive motor and a drive element connected to and driven by the drive motor. A working tool is connected to the drive element and driven by the drive element. A braking device is correlated with the drive element, wherein the braking device in a first state, in which the braking device is applied, blocks the drive element and in a second state, in which the braking device is released, releases the drive element so that the drive elements can rotate freely. The braking device has a brake lever and a sensor that detects the first and second states of the braking device. A control unit is provided, wherein an output signal of the sensor as a state signal of the first state or the second state is supplied to the control unit. The control unit, based on the state signal, controls devices of the power tool. | 08-06-2009 |
20090095497 | Hand-Guided Power Tool - A hand-guided power tool has a drive motor and a tool in driving connection with the drive motor. At least one handle is provided for guiding the power tool in operation. At least one antivibration element functionally connects the at least one handle and the drive motor. The at least one antivibration element has a coil spring and a guide, wherein the coil spring has an end connected to the guide. The coil spring has a first radial spacing relative to the guide in a first radial direction and has a second radial spacing relative to the guide in a second radial direction, wherein the second spacing is smaller than the first spacing or is zero. | 04-16-2009 |
20090077815 | Motor Chain Saw - A motor chain saw has a housing, a motor arranged in the housing, a drive pinion driven by the motor, and a guide bar connected to the housing. A saw chain is driven in circulation about the guide bar by the drive pinion. A lateral panel is arranged between the housing and an attachment section of the guide bar. The guide bar and the lateral panel each have a distance relative to the drive pinion upstream and downstream of the drive pinion when viewed in a circulating direction of the saw chain. The lateral panel has a first guide that guides the saw chain at a level of rivets of the saw chain, wherein the first guide extends approximately parallel to the plane of the guide bar. | 03-26-2009 |
20090013842 | Power Tool - A power tool has a drive motor that drives a tool and an optical guiding device secured on the power tool in alignment relative to the work tool. The guiding device is arranged in a low-vibration arrangement on the power tool and is in particular secured on the power tool in a low-vibration area of the power tool. At least one section of the power tool vibrates in the form of a standing wave in at least one direction, wherein the low-vibration area where the guiding device is arranged is the area of a node of the standing wave. | 01-15-2009 |
20090013541 | Protective Cover for a Hand-Held Cut-Off Machine - A protective cover of a hand-held cut-off machine has a bracket that is secured on the exterior side of the protective cover. The bracket is locked in at least one locked position with at least one locking projection in at least one receptacle of the protective cover. The bracket is releasable from the locked position by a movement of the bracket in the release direction. A simple release of the bracket can be achieved in that the protective cover has means that move the locking projection upon movement of the bracket in the release direction at least partially out of the receptacle. | 01-15-2009 |
20090012699 | Method for Operating a Two-Stroke Engine - A two-stroke engine has a cylinder with a combustion chamber delimited by a reciprocating piston, wherein the piston drives in rotation a crankshaft, and wherein a spark plug projects into the combustion chamber and ignites a fuel/air mixture. The two-stroke engine further has devices for supplying fuel and combustion air to the combustion chamber and a control unit that determines the ignition timing based on an ignition map. The ignition map indicates the ignition timing as a function of the engine speed for at least one first and one second operating states and for at least one first and one second engine speed ranges. The engine is controlled in that for an engine cycle the ignition timing is set in the second operating state at least within the first engine speed range based on the engine speed and on the number of engine cycles since the last combustion. | 01-08-2009 |
20080276912 | Hand-Held Power Tool - A hand-held power tool has at least one operating medium tank having at least one opening. At least one connecting conduit is arranged external to the operating medium tank. At least one connecting member is inserted into the opening, wherein the at least one connecting conduit is connected to the at least one connecting member. Securing devices that secure a rotational position of the at least one connecting member in the opening are provided. | 11-13-2008 |
20080271698 | Internal Combustion Engine with Starter Device - An internal combustion engine has a starter device, wherein the starter device has a drive member and a driven member and a locking mechanism for coupling the drive member and the driven member to one another for starting the internal combustion engine. The locking mechanism has at least one pawl that is pivotably supported on the driven member. For decoupling the drive member and the driven member, the at least one pawl is pivoted outwardly relative to an axis of rotation of the starter device. The at least one pawl has at least one pivot position in which the at least one pawl contacts at least one contact area of the driven member. The at least one pawl has at least one cover covering the at least one contact area. | 11-06-2008 |
20080233847 | Guide Cart and Power Tool with Guide a Cart - A guide cart for a hand-held power tool with a driven tool has a pivot device that is pivotable between an open position and a fixation position. A fixation elements is provided that releasably secures the power tool on the guide cart. The fixation element is secured on the pivot device. The pivot device has at least one support for supporting a tool of the power tool in the fixation position of the pivot device. The guide cart has a holder for the power tool, wherein holder is provided with a base plate and has at least one lateral guide for the power tool. The pivot device is supported on the base plate. The pivot device and the baseplate together form a C-shaped frame. | 09-25-2008 |
20080196685 | Starter Device - A starter device for an internal combustion engine has a drive element and a output element. The drive element enables driving the starter device in rotation. The output element is supported rotatably about an axis of rotation and has a coupling device for releasably coupling the starter device to the crankshaft. A coil spring is arranged operatively between drive element and output element in an axial direction between a first abutment at the drive element and a second abutment at the output element. The first and second abutments have a first spacing relative to one another at least at one circumferential location in a first area and a second spacing relative to one another in a second area. The first and second spacings are measured parallel to the axis of rotation. The first spacing is smaller than the second spacing. The first area is radially outside of the second area. | 08-21-2008 |