| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 173112000 | With means to cause or control advance of hammer head | 13 |
| 20090229843 | Valve device for a percussion device and a percussion device for a rock drilling machine - A valve device (V, | 09-17-2009 |
| 20090266570 | IMPACT TOOL - An impact tool for simultaneously providing a rotational force and an impact force to an object has an output shaft rotated by a motor, hammer for intermittently providing an impact force to the output shaft, hammer holder for movably holding the hammer, and an impact force generator for generating the impact force from an output of the motor. An air chamber is formed between the hammer and the hammer holder such that a volume of the air chamber is variable in response to a position of the hammer relative to the hammer holder. In addition, the hammer receives a bias force generated in a direction toward the output shaft by a biasing device. This bias force effectively increases the impact force in cooperation with an air pressure caused by a volume change of the air chamber. | 10-29-2009 |
| 20100101815 | JUMBO HAMMER CLUTCH IMPACT WRENCH - A power driven tool for rotating a mechanical element. The tool includes a housing and motor. The motor has an output shaft. The shaft rotates relative to the housing. The tool also includes an impact drive axially fixed within the housing. The impact drive includes a base and an anvil shaft having an anvil. The impact drive includes an annular hammer having opposite impact lands pivotally mounted on the base for movement between three positions, including a forward position in which the hammer is positioned so one impact land engages the anvil, a reverse position in which the hammer is positioned so another of the impact lands engages the anvil, and a disengaged position in which neither of the impact lands engages the anvil. Further, the tool includes a ratchet mechanism. The ratchet mechanism includes an output drive mounted for rotation relative to the housing for rotating a mechanical element. | 04-29-2010 |
| 20110011607 | MOTOR DRIVEN HAMMER HAVING MEANS FOR CONTROLLING THE POWER OF IMPACT - A motor driven hammer is described comprising a housing ( | 01-20-2011 |
| 20110139475 | IMPACT DEVICE HAVING AN IMPACT MECHANISM LUBRICATING DEVICE - The invention relates to an impact device, having an internal combustion engine and an impact mechanism driven by the internal combustion engine. An engine lubricating device supplies lubricant to the internal combustion engine. An impact mechanism lubricating device lubricates the impact mechanism accordingly. For this purpose, the engine lubricating device and the impact mechanism device partially comprise the same components. | 06-16-2011 |
| 20110147025 | Power tool having an impact mechanism - A power tool having an impact mechanism including a rotary shaft defining a tool axis of rotation, an impact member moveable along the tool axis of rotation, a support member fixed in position relative to the tool axis of rotation, a biasing member for urging the impact member away from the support member, and at least one axial stop member positioned between the impact member and the support member. According to the invention, the distance between the axial stop member and the tool axis of rotation is more than the distance between the biasing member and the tool axis of rotation. | 06-23-2011 |
| 20110303429 | POWER TOOL AND CONTROL METHOD - A power tool and control method is disclosed. The power tool has a striker, which is guided along an axis parallel to an impact direction. A pneumatic chamber has a volume which varies with a movement of the striker along the axis. A valve device that is actuatable depending upon the movement direction of the striker connects the pneumatic chamber with an air reservoir. The valve device is actuated to open in the case of a movement of the striker in the impact direction and in the case of a movement of the striker against the impact direction is actuated to throttle or close. The throttled or closed valve device restricts an air flow flowing through it to a maximum of one tenth of the value as compared to the air flow in an opened position. | 12-15-2011 |
| 20110303430 | POWER TOOL - A power tool is disclosed. The power tool has a striker, which is guided along an axis in a guide tube. A pneumatic chamber has a volume which varies with a movement of the striker. The pneumatic chamber is closed by the striker, the guide tube and a valve device. The valve device has in a flow channel a sealing element that is moveable between two positions in a bearing along the axis. The flow channel has a first cross-sectional area in a first of the two positions of the sealing element adjacent to a first mating surface of the bearing, and the flow channel has a second cross-sectional area in a second of the two positions of the sealing element adjacent to second mating surface of the bearing offset from the first mating surface along the axis. The second cross-sectional area is greater than the first cross-sectional area. | 12-15-2011 |
| 20130255984 | IMPACT DEVICE FOR AN ELECTRIC NAIL GUN - An impact device is used for an electric nail gun. The electric nail gun includes a supporting frame, a flywheel disposed pivotally on the supporting frame, and a swing arm disposed pivotally on the supporting frame. The impact device includes a sliding block disposed movably on the supporting frame, a nail striker rod connected to the sliding block, and an impact block floatable on the sliding block. When the swing arm rotates toward the flywheel, it presses the impact block against the flywheel to thereby move the sliding block from a pre-firing position to a firing position. Since the impact block is not co-rotatable with the swing arm, it can be designed to move in a direction the same as that of the nail striker rod, thereby facilitating smooth firing operation. | 10-03-2013 |
| 20140144660 | ROCK DRILL - A rock drill including a first control valve ( | 05-29-2014 |
| 20140209340 | Variable Volume Accumulator - A hammer assembly including a hammer housing and a work tool movably supported in the hammer housing is provided. A gas chamber is defined in the hammer housing and contains a compressible gas. An accumulator assembly includes an interior space. A barrier divides the interior space into a first interior portion containing a compressible gas and a second interior portion configured to receive a pressurized fluid. The barrier is configured to be movable in response to changing the amount of pressurized fluid in the second interior portion and such that movement of the barrier varies the volume of the first interior portion. The first interior portion is in communication with the gas chamber. A control valve assembly is configured for selectively placing the second interior portion of the accumulator assembly in communication with a pressurized fluid source. | 07-31-2014 |
| 173113000 | Advance operated by hammer drive or actuated in response to hammer vibration | 2 |
| 20110240323 | VIBRATORY MECHANISM FOR A PILE DRIVER AND A PILE DRIVER - A vibratory mechanism for a pile driver com-prises a static part and a dynamic part. The dynamic part is movable with respect to the static part. The static part is provided with a drivable crankshaft and the dynamic part comprises a housing and a vibration member. The vibration member is drivably coupled to the crankshaft through a connecting rod and linearly movable with respect to the housing in a direction of vibration. The housing is resiliently coupled to the vibration member. | 10-06-2011 |
| 20120037390 | FREE-MASS AND INTERFACE CONFIGURATIONS OF HAMMERING MECHANISMS - The design of the free-mass in an ultrasonic driller/corer (USDC) has been refined in order to improve the performance and operational reliability of the system. In one embodiment, the improvements in performance and operational reliability include decreasing the impact surface area of the free-mass to increase the transfer of impact energy from the piezoelectric transducer and reductions in the likelihood that the system will jam. | 02-16-2012 |
