Class / Patent application number | Description | Number of patent applications / Date published |
188290000 | Using a rotary-type fluid damper | 58 |
20080202873 | Rotary damper - A rotary damper includes a driven-to-rotate member having integrally a driven-to-rotate part for coupling to a drive member and a first inner cylindrical wall, the first inner cylindrical wall including a locking part at a bottom end of the first inner cylindrical wall; a fixed support member for holding the driven-to-rotate member so as to rotate freely; a receiving part formed between the fixed support member and the driven-to-rotate member; and a seal member for sealing an outer perimeter of the receiving part so that the driven-to-rotate member and the fixed support member are capable of relative rotation. A viscous fluid is provided inside the receiving part for damping relative rotation between the driven-to-rotate member and the fixed support member. | 08-28-2008 |
20090000890 | Steering damping device - A steering shaft ( | 01-01-2009 |
20090065314 | DAMPER - A damper (D | 03-12-2009 |
20090071777 | Electro-Hydraulic Control System with Multiplexed Solenoid for Retarder Operation and Main Pressure Modulation - An electro-hydraulic control system is provided that utilizes a shift solenoid and shift valve to multiplex a single pressure control solenoid to control both modulation of a main pressure regulator valve and retarder operation (fill and pressure). | 03-19-2009 |
20090159382 | Rotary damper - A rotary viscous damper, comprising a stator and a rotor defining between them a main chamber filled with a visco-elastic fluid, which can be of a thixotropic, dilatant, or Bingham, etc, or Magneto-Rheological nature, substantially radial paddles being disposed on each of said stator and rotor, said paddles dividing said main chamber into a plurality of chambers, and presenting means to create a fluid communication between the chambers through specifically shaped conduits that may be located at either the exterior, interior, upper or lower section of the damping chambers. Said damper further comprises at least one conical elastomeric bearing between the stator and the rotor to serve as dynamic sealing, as well as a guide between the stator and the rotor. A volume compensation device is also comprised in the said damper to accommodate fluid temperature changes. Self-lubricated bearings are also comprised in the said damper to guide the main shaft of the stator. Such bearings can be replaced with metal-bearings as the envelope permits. The stator paddles may each have two pressure-relief valves installed, one for each of tandem damping chambers, to limit the load born by the rotary damper structure. Said damper's rotor is also specially coated on the interior to minimize wearing and augment the life of the part. Said damper's housing exterior has heat-dissipative fins to cool the damper especially during extended periods of operation as fluid temperature increases. In low temperature environments, said damper operates with heating elements installed at the exterior or interior of the damping chamber to pre-heat the fluid, reducing start-up time for said damper on a helicopter. Said damper also comprised of a pressure-monitoring system to monitor damping characteristics of the damping throughout the life of the damper as a pre-emptive effort against failure of the damper out in the field. | 06-25-2009 |
20090266660 | Breakdown Preventive Device of Rotary Damper - In the breakdown preventive mechanism of a rotary damper of the invention, when the upper rotor ( | 10-29-2009 |
20090277735 | ROTATION DAMPER - A rotary damper is provided so that air incorporated into a housing during assembly is, not excessively compressed, whereby a generation of a peculiar sound due to the air incorporated into the housing can be prevented even though the rotor rotates in both directions, and so that the air is stopped and captured in a fixed place whereby influence on the generated torque can be reduced, and irregularity of the torque can be reduced progressively. | 11-12-2009 |
20090321200 | VISCOUS FLUID-SEALING DAMPER - A viscous fluid-sealed damper ( | 12-31-2009 |
20090321201 | SUSPENSION DEVICE - According to problem solving means of the present invention, in a suspension device (S) comprising a motion transforming mechanism (T) for transforming a linear motion of a linear motion member ( | 12-31-2009 |
20100038196 | DAMPER | 02-18-2010 |
20100175957 | Rotary Damper - In a rotary damper capable of being easily assembled by reducing the remaining air inside an accommodation portion and reducing the non-uniformity of damping torque, a center shaft | 07-15-2010 |
20100175958 | Hydrodynamic Retarder - A hydrodynamic retarder having a first blade wheel and second blade wheel concentric thereto, forming a hydrodynamic circuit grouped about a common rotary axis. Each blade wheel includes a base body and a blade arrangement fixed thereto including a plurality of blades each connected to receptacles in the base body. A first ring segment of at least one blade wheel includes at least one first blade having a flow edge facing the other blade wheel in each case, said edge having at least one extension running in a substantially straight line between the radial outer end thereof and the radial inner end thereof, and at least one second blade is provided in a second ring segment of the blade wheel, the blade having a retraction both opposite the flow edge facing the other blade wheel in each case, and opposite a protrusion protruding in the direction of the other blade wheel. | 07-15-2010 |
20100187057 | HYDRODYNAMIC RETARDER WITH A TANGENTIAL INFLOW AND OUTFLOW PRINCIPLE - A hydrodynamic retarder with a tangential inflow and outflow principle which is achieved by the rotor ( | 07-29-2010 |
20100200344 | Apparatus for damping the torsional excitation of a hollow drive shaft - An apparatus for damping the torsional excitation of a hollow drive shaft is provided. The apparatus includes an elongate member that extends along the interior of the drive shaft, one end of the member is secured to one end of the drive shaft, the other end of the member is disposed at the other end of the drive shaft, and a hydraulic damping device secured to the other end of the drive shaft for damping vibration of the other end of the member. The hydraulic damping device includes a piston and cylinder arrangement having first and second hydraulic chambers, a reservoir of hydraulic fluids, and hydraulic circuitry which uses the hydraulic chambers to communicate with the reservoir. The hydraulic damping device is arranged so that any leakage of hydraulic fluid from the first and second hydraulic chambers via a piston/cylinder interface passes to the reservoir of hydraulic fluid. | 08-12-2010 |
20100243391 | STEERING DAMPER DEVICE FOR SADDLE-RIDING TYPE VEHICLE - A saddle riding type vehicle includes a vehicle body frame | 09-30-2010 |
20100282553 | ROTARY DAMPER HAVING IMPROVED BRAKING FEATURES - A rotary damping device ( | 11-11-2010 |
20100300820 | Torsional Vibration Damping System for the Drive Train of a Vehicle - A torsional vibration damper system includes a primary side and a secondary side coupled to the primary side by a damper fluid arrangement for rotation and for relative rotation with respect to one another. The damper fluid arrangement has a first damper fluid which transmits a torque between the primary side and the secondary side and a second damper fluid which is loaded when there is an increase in pressure in the first damper fluid. A rotary feedthrough supplies or removes first damper fluid to or from at least one displacement chamber of the damper fluid arrangement and a pressure fluid generation system for providing first damper fluid to be supplied to the damper fluid arrangement via the rotary feedthrough. The pressure fluid generation system comprises at least two pressure fluid pumps. | 12-02-2010 |
20110011685 | Rotary Damper - The present invention provides a rotary damper in which both yields and braking characteristics can be enhanced. The rotary damper of the invention includes a valve mechanism which comprises an operating chamber | 01-20-2011 |
20110048878 | Rotary Damper - The present invention provides a rotary damper in which both yields and braking characteristics can be enhanced. The rotary damper of the invention includes a valve mechanism which comprises an operating chamber | 03-03-2011 |
20110056782 | HYDRAULIC ROTARY DAMPER FOR VEHICLE - The invention relates to a pressurized hydraulic rotation damper intended for use on a multiwheeled vehicle. The rotation damper comprises an outer housing and a lid that together enclose a damping-medium-filled main chamber, which chamber is pressurized by a pressure tank and divided by a delimiting blade/arm into two volumes. The damping medium flows between the two volumes in a duct delimited by at least a first valve and a second valve. These valves throttle the flow between the volumes when the blade moves in an inward and outward motion respectively, starting from an intermediate position where the two volumes are substantially equal in size, to an outer position, in which the blade bears against or is placed close to the inner face of the outer housing. The first valve controls the flow for outward motions and the second valve is used to control the flow for inward motions to either pass through the first valve, through the second valve or through both valves. | 03-10-2011 |
20110162927 | METHOD FOR OPERATING A RETARDER - The invention relates to a method for operating a hydrodynamic retarder having at least one working chamber that is filled with a working medium in braking mode, and substantially emptied in non-braking mode. According to the invention, a prescribed amount of working medium is pulsingly brought into the working chamber of the retarder in non-braking mode. This can occur either constantly, or as a function of suitable measurement variables. | 07-07-2011 |
20110220442 | Hydrodynamic machine, especially hydrodynamic retarder - The invention relates to a hydrodynamic machine, especially a hydrodynamic retarder, comprising two blade wheels which are opposite of one another in such a way that they jointly form a toroidal working chamber which can be filled with a working medium in order to hydrodynamically transfer torque by means of a cycle flow of the working medium in the working chamber from the first blade wheel to the second blade wheel, with the first blade wheel rotating about a rotation axis and the second blade wheel rotating about the same rotation axis in the same direction of rotation or opposite of the direction of rotation of the first blade wheel, or being held in a stationary manner. | 09-15-2011 |
20120090932 | DAMPER - A damper includes a rotary shaft, a sleeve, damping oil, and the damping oil is filled in a closed chamber formed between the rotary shaft and the sleeve; cooperating grooves are formed on the rotary shaft; partition parts are formed between the two cooperating grooves; oil passing holes provided on the partition parts are communicated with the two cooperating grooves; the oil passing holes are controlled by the check valves to make the damping oil flow in a single direction between the two cooperating grooves; the rotary shaft passing through the cooperating hole on the necking stop wall of the sleeve is connected by a connection member; two spacers are integrated with the sleeve; the height of the spacers locating in the cooperating grooves just fits in with the depth of the cooperating groove; an oil passing gap formed between the rotary shaft and the sleeve and is variable. | 04-19-2012 |
20120273310 | BRAKING STRUCTURE FOR TRUNING BODY - A braking structure for a turning body includes an engagement device rotatably engaging a movable-side portion of a rotation damper with a base at a rotation center of the movable-side portion; a first fixing device fixing the movable-side portion relative to the turning body; and a second fixing device fixing a stationary-side portion of the rotation damper relative to the base. The engagement device includes an axis protrusion provided on one side of either the movable-side portion or the base, and a receiving portion provided on the other side of either the movable-side portion or the base, and receiving the axis protrusion from a direction perpendicular to a rotation axis of the rotation. Also, an inserting path for the axis protrusion continuing to the receiving portion is adapted to expand in the direction perpendicular to the rotation axis by an elastic deformation when the inserting path receives the axis protrusion. | 11-01-2012 |
20130153347 | DAMPER - A silicone oil ( | 06-20-2013 |
20130306417 | DAMPER DEVICE - A damper device includes an inner part having a cylindrical shape; an outer part including an annular space with a bottom to rotatably or relatively rotatably house the inner part from one cylinder end side; and a viscous fluid filled in the annular space. An outer side of the inner part is formed with a circular groove to fit an outside seal ring. Also, an inner side of the inner part is formed with a circular step surface positioned closer to the one cylinder end side than the circular groove, and positioning an inside seal ring. A depth of the circular groove has a dimension approximately half a thickness of the inner part at a portion forming the circular groove. | 11-21-2013 |
20140231197 | DAMPING DEVICE - The damping device includes: a fixed cylinder that is configured to be fixed to a first structural body and formed into a cylindrical shape so as to comprise a hollow portion; a shaft member that is configured to be fixed to a second structural body, the shaft member being housed in the hollow portion of the fixed cylinder and having an outer peripheral surface provided with a helical thread groove; a nut member that is threadedly engaged with the shaft member, and converts an axial motion of the shaft member into a rotational motion; a rotor member that is formed into a cylindrical shape so as to cover the fixed cylinder and to form a cylindrical accommodation chamber between the rotor member and an outer peripheral surface of the fixed cylinder, and is rotated by the nut member; and viscous fluid that is sealed in the cylindrical accommodation chamber. | 08-21-2014 |
20140311840 | Hydrodynamic Retarder and Method for Actuating Same - The invention relates to a hydrodynamic retarder comprising a rotor that revolves in a decelerating mode and a counter-rotating twin rotor or a stationary stator which jointly from a working chamber that is or can be filled with a working medium. The rotor can be driven using driving power via a drive train in order to decelerate the drive train. The invention is characterized in that an energy storage device is associated with or integrated into the retarder, said energy storage device comprising a mechanical energy store, pressure accumulator or kinetic energy store as well as an acceleration mechanism that is connected to the rotor, said acceleration mechanism being linked to the energy store and the rotor or being integrated into the rotor in order to convert energy stored in the energy store into an angular acceleration of the rotor. | 10-23-2014 |
20150083536 | APPARATUS FOR RETARDING ROTARY NOZZLE SPEED - An apparatus for retarding rotation of a nozzle includes a hollow housing, a rotary shaft within the housing, a rotatable rotor on the rotary shaft free to move axially along the shaft, and a cam assembly coupling the rotor and shaft together in the housing such that rotor rotation on the shaft causes the cam assembly to displace the rotor axially on the shaft in a first direction. A set of springs on the shaft biases the rotor in a second direction opposite the first direction on the shaft. Finally, a viscous fluid disposed between the rotor and the housing generates a drag on rotor rotation with the shaft. Relative rotation of the rotor with respect to the shaft in conjunction with a variable gap between the rotor and housing are used to slow and thus control rotary nozzle speed. | 03-26-2015 |
20160017954 | ROTARY DAMPERS, SYSTEMS, AND RELATED METHODS - Rotary dampers and systems for use and installation within a rotary winged aircraft, and related methods, are provided herein. In some aspects, a rotary damper includes a housing having a rotor assembly positioned inside the housing. The rotary damper may further include at least one resilient member disposed adjacent to an outer portion of the housing. The at least one resilient member is externally visible from outside of the rotary damper. In some aspects, the resilient member includes a torsional spring of the rotary damper. In certain aspects, the resilient member is disk shaped and slidable within a portion of the rotary damper. In some aspects, at least one primary liquid orifice is provided in a portion of the at least one rotor member. In some asects, at least one pressure equalization port is disposed within a portion of the rotor assembly. | 01-21-2016 |
20160033004 | Rotary Viscous Vibration Damper or Rotary Viscous Vibration Absorber - A rotary viscous vibration damper or absorber has a hub part which can be fastened to a crankshaft of an engine, in particular of an internal combustion engine, and a vibration damper ring which is mounted such that it can be rotated relative to the hub part. A shear gap which is filled with a silicone oil is formed between the hub part and the vibration damper ring, in which shear gap flange bushings for guiding the vibration damper ring are mounted. The flange bushings are composed of a liquid crystal polymer. | 02-04-2016 |
188291000 | Including clutch | 6 |
20080302619 | ROTARY DAMPER WITH ONE-WAY CLUTCH - A rotary damper ( | 12-11-2008 |
20080308366 | VISCOUS SHEAR DAMPING STRUT ASSEMBLY - A damping device using viscous shear to moderate substantially linear movement. The device has a housing with one or more reservoirs containing a viscous fluid, such as silicone, and one or more retractable struts that can extend from the housing. The strut has a portion formed as a toothed rack, and an associated axle has a pinion gear on a portion associated with the toothed rack of the strut. The teeth of the rack mate with teeth of the pinion gear. A disk, or preferably series of spaced disks, can be mounted on the axle inside the reservoir to dampen linear movement of the strut, from shear with a static plate adjacent to the disk on the axle. The relatively fixed, spaced disks or plates are adjacent to or interdigitated with the disks on the gear axles to dampen linear movement of a strut. | 12-18-2008 |
20140182983 | Disconnectable Hydrodynamic Retarder and Method for Controlling Same - The invention concerns a hydrodynamic retarder | 07-03-2014 |
20160082968 | METHOD FOR CONTROLLING A HYDRODYNAMIC RETARDED THAT CAN BE DISENGAGED BY A DISCONNECT CLUTCH - A method for controlling a hydrodynamic retarder in a motor vehicle that can be mechanically disengaged via a disconnect clutch, comprising a drive motor whose power output is controlled via an actuator such as a foot pedal or a lever; whereby in an overrun operation the acceleration of the motor vehicle is collected or detected and compared with a pre-specified acceleration value; and whereby in the non-braking mode the disconnect clutch is engaged, regardless of an initiation of a braking mode by an operator of the motor vehicle or a driver assist system and the working chamber is maintained drained when the acceleration exceeds an acceleration limit. | 03-24-2016 |
20160084332 | METHOD FOR CONTROLLING A HYDRODYNAMIC RETARDER THAT CAN BE MECHANICALLY DISENGAGED BY A DISCONNECT CLUTCH - A method for controlling a hydrodynamic retarder in a motor vehicle that can be mechanically disengaged via a disconnect clutch, whereby at least one of the rotational speed of a revolving bladed rotor and the speed of a motor vehicle is monitored and a disconnect clutch is engaged below at least one of a pre-specified rotational speed of the revolving bladed rotor and a pre-specified speed of the motor vehicle, regardless of a request made by a driver assist system or by operation of an input device by the operator of the motor vehicle to turn on the hydrodynamic retarder. | 03-24-2016 |
20160200302 | HYDRODYNAMIC RETARDER DEVICE, METHOD FOR ITS USE TOGETHER WITH A VEHICLE | 07-14-2016 |
188292000 | Gear pump | 3 |
20100193306 | DAMPER - An inner rotor | 08-05-2010 |
20140284155 | SELF-ALIGNING ROTARY DAMPER ASSEMBLY - A rotary damper with a toothed wheel gear projecting away from a housing having snap-in connection structures disposed on opposing sides of the wheel gear. The wheel gear may be inserted through a panel opening having a pair of opposing transverse slots. In the assembled condition, the housing with the connected wheel gear may slide linearly in the longitudinal direction of the slots to permit self-adjustment relative to an operatively connected mating gear. Proper meshing relation between the wheel gear and the mating gear is thereby maintained. | 09-25-2014 |
20140360825 | ROTARY DAMPER - A rotary damper for a motor vehicle includes at least one damper element for damping the relative movement of a first mass located on the wheel-suspension side and of a second mass located on the vehicle-body side, with at least one vibration absorber ( | 12-11-2014 |
188293000 | Driving relatively moving element which causes flow of brake fluid | 5 |
20130206523 | Wellhead Drive Brake System - A braking arrangement for drive heads or pump heads, to be preferably used in a progressing cavity pump (PCP) system in oilfields, consisting of at least one disk moving inside a viscous fluid and facing a static disk, in which mechanical energy is transformed into heat. The viscous brake is a device acting as a function of the rotation speed, in which a higher speed generates a higher braking power caused by the increase of friction among the disks and the fluid. The arrangement may comprise more than one mobile and static disk assemblies, as well as a hollow axis instead of a solid one, to allow housing the pumping rod inside the axis, and may also comprise an anti-reverse bearing. | 08-15-2013 |
20140339031 | DEVICE FOR DAMPING THE MOVEMENT OF A MOVABLY MOUNTED COMPONENT - A device for damping the movement of a movably mounted component includes a first, mechanically acting braking device with at least one friction pair, wherein, in order to generate a braking force, a driven friction surface can be rotated about an axis of the first braking device relative to a secured friction surface resting thereon, and a second braking device which is coupled to the first braking device, wherein the friction surfaces of the friction pair, or of at least one of the friction pairs, are pressed against each other in response to a braking force exerted by the second braking device. The second braking device has at least one driven damper surface that can be rotated about an axis of the second braking device and cooperates with at least one secured damper surface to enclose at least one gap in which a viscous damping medium is present that causes a braking force of the second braking device when the at least one driven damper surface is rotated with respect to the at least one secured damper surface. | 11-20-2014 |
20140345992 | DAMPER - A damper includes a cavity and a rotation shaft. The rotation shaft is inserted into the cavity of the body in sealing way. An oil cavity is disposed between the cavity and the rotation shaft. The external wall of the rotation shaft is disposed with a pair of protruding ribs axially. Each protruding rib is a groove. One side of the groove is a first retaining wall and the other side is a second retaining wall. A transitional arc is disposed between the side wall of the groove and the top surface of the first retaining wall. A first shape is formed between the other side wall of the groove and the top surface of the second retaining wall. A blade is disposed between the groove of one protruding rib and an internal wall of the cavity, and the blade is movable between the two retaining walls of the groove. | 11-27-2014 |
20160377142 | FLUIDS HAVING A CONTROLLED STRESS RESPONSE CHARACTERISTIC - A shear thickening fluid having a controlled stress response, in which various stress response characteristics, including, an onset stress, a boundary stress and a fractures stress, can be controlled. The stress response characteristics controlled by the controlled properties of the shear thickening fluid, including the viscosity of a fluid medium, the mechanical properties of the suspended particles and the mechanical properties of the fluid boundary. | 12-29-2016 |
20180023653 | DAMPER AND METHOD FOR MANUFACTURING DAMPER | 01-25-2018 |
188296000 | Driving radial vanes which cause toroidal flow of brake fluid | 13 |
20100051399 | ROTATIONAL DAMPER - A rotational damper comprises a stator and a rotor that is rotatably supported in the stator, the rotor having a first friction element ( | 03-04-2010 |
20100187058 | Hydrodynamic Retarder - A hydrodynamic retarder having a first blade wheel and having a second blade wheel concentric thereto, together forming a hydrodynamic circuit grouped about a common rotary axis. Each blade wheel is made of a base body and a blade arrangement fixed thereto including a plurality of blades. The hydrodynamic circuit is supplied by a fluid inlet, while the fluid removal from the hydrodynamic circuit is performed by a fluid outlet. The fluid inlet has an inlet spiral enabling tangential fluid flow and the fluid outlet has an outlet spiral enabling tangential fluid flow. At least one inlet spiral is associated with a flow guide guiding the fluid into the hydrodynamic circuit with at least one axial component. | 07-29-2010 |
20100193307 | HYDRODYNAMIC RETARDER WITH A TANGENTIAL INFLOW AND OUTFLOW PRINCIPLE - A hydrodynamic retarder with tangential inflow and outflow is formed with at least one radial recess ( | 08-05-2010 |
20120073919 | HINGE DAMPER ASSEMBLY - A damper assembly incorporating a bushing adapted to rotate within a wall structure and engage a post on a bin or other element to be controlled. The bushing defines a hub of an integral, coaxial rotor which rides within a fluid containing housing. The bushing and rotor rotate concurrently about a common axis during rotation of the bin or other device being controlled. The drag on the rotor thereby slows the rotation of the engaged post and the associated bin or other structure being controlled. | 03-29-2012 |
20140048363 | Rotary Damper - The present invention provides a rotary damper comprising a hollow housing ( | 02-20-2014 |
20150008082 | ROTARY DAMPER - A rotary damper includes: a shaft capable of rotating about a central axis; a pair of side panels that support the shaft rotatably; a case provided between the pair of side panels such that an operating chamber is defined in an interior thereof; a vane provided on the shaft such that a tip end thereof slides against an inner periphery of the case, thereby dividing the operating chamber into a first chamber and a second chamber; and a damping valve provided in the shaft to apply resistance to a flow of a fluid traveling between the first chamber and the second chamber. | 01-08-2015 |
20150014105 | ROTARY DAMPER - A rotary damper includes: a shaft having a hollow portion; a pair of side panels; a case provided between the pair of side panels; a vane provided on the shaft so as to divide a first chamber and a second chamber; a liquid chamber defined within the hollow portion; a first partition wall and a second partition wall housed in the hollow portion; a first side valve chamber that is defined by the first partition wall; a second side valve chamber that is defined by the second partition wall; a first side port that connects the first side valve chamber to a second liquid chamber; a second side port that connects the second side valve chamber to the second liquid chamber; a first side damping valve capable of opening and closing the first side port; and a second side damping valve capable of opening and closing the second side port. | 01-15-2015 |
20150034435 | ROTARY DAMPER - A rotary damper includes a housing having an outer cylinder, an inner cylinder coaxially disposed inside the outer cylinder, and a bottom plate closing one end side of the outer cylinder and the inner cylinder, to form an annular liquid chamber with a viscous fluid therein, and a rotor including a cylindrical blade portion rotatably received in the liquid chamber. An annular locking groove extends circumferentially in a first portion at an outer peripheral surface of the inner cylinder, or a second portion facing the first portion on an inner peripheral surface of the blade portion. A locking convex portion projects from the other of the first portion or the second portion, and locked in the locking groove. An annular inside seal member is interposed between the inner cylinder and the blade portion, and an annular outside seal member is interposed between the outer cylinder and the blade portion. | 02-05-2015 |
20150060219 | HYDRODYNAMIC RETARDER - A hydrodynamic retarder having a rotor ( | 03-05-2015 |
20160008826 | ISOLATED BEARING VISCOUS SPEED RETARDING DEVICE FOR ROTARY NOZZLES | 01-14-2016 |
20160201742 | VISCOUS ROTATIONAL SPEED CONTROL DEVICE | 07-14-2016 |
20160201743 | VISCOUS ROTATIONAL SPEED CONTROL DEVICE | 07-14-2016 |
20160201744 | VISCOUS ROTATIONAL SPEED CONTROL DEVICE | 07-14-2016 |