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| Number | Title | Issue Date |
| 8096369 | Striking mechanism for a handheld electric power tool The invention relates to a striking mechanism of a handheld electric power tool, in particular a percussion drill and/or percussion hammer, having a hammer cylinder, a piston mounted with a guide section inside the hammer cylinder in a longitudinally displaceable ma... | 01/17/2012 |
| 7971654 | Rotary impact tool A rotary impact tool includes a drive shaft rotationally driven by a rotational drive power source, a hammer arranged around the drive shaft, a ball engaging with a cam groove formed on the outer circumferential surface of the drive shaft and a cam groove formed on ... | 07/05/2011 |
| 7921933 | Impact driving tool In a driving tool, a diameter of an intermediate member is enlarged to increase a mass of the intermediate member and an outside diameter of a cylinder at a position where the intermediate member is internally provided is enlarged in accordance with the enlarged dia... | 04/12/2011 |
| 7191848 | Rolling hammer drill A hammer drill with rolling contact at the contact surfaces for transmission of axial force between a drive shaft and wave race. By using roller bearings, line contact is obtained. The area of contact is thus close to zero as opposed to a relatively large area in en... | 03/20/2007 |
| 7156189 | Self mountable and extractable ultrasonic/sonic anchor Self drilling anchors and related methods and apparatus. In one embodiment an apparatus comprises a drill bit, a hammer mechanism for hammering the drill bit in a first direction and in a second direction, and a selection mechanism for controlling whether, at a give... | 01/02/2007 |
| 7134508 | Rotary to reciprocating motion conversion attachment for a power rotary hand tool A preferred embodiment of a rotary tool reciprocating motion conversion attachment for a rotary power hand tool is described which is configured to be attached to a nose portion of the hand tool housing. The attachment has a rotary drive train in a housing that is c... | 11/14/2006 |
| 7121360 | Hand-held power tool A hand-held power tool includes a percussion mechanism (3) arranged in the tool housing (2), and a motor (4) for driving the percussion mechanism and connected therewith by a gear unit (5), with the percussion mechanism including an eccen... | 10/17/2006 |
| 7118507 | Automatic reduction-ratio changing apparatus An automatic reduction-ratio changing apparatus comprises a planetary gear mechanism including a sun gear, planet gears, and an internal gear. When a load, which exceeds a predetermined torque, is applied to the internal gear, a pawl of a lock lever is engaged with ... | 10/10/2006 |
| 7108077 | Power tool A power tool (10) with a housing (12) which accommodates a driven shaft (32) for holding a material-removing tool (40) and which sets the driven shaft into rotary oscillating motion capable of being produced by an eccentric (22) ro... | 09/19/2006 |
| 7108079 | Electric power tool A cover which covers outer peripheries of fastening screws are disposed on an outer periphery of a hammer case. A stopper which detachably positions and fixes the cover to the outer periphery of the hammer case is disposed. ... | 09/19/2006 |
| 7096972 | Hammer drill attachment Power tools of the type under consideration include hammer drills, for example, which are electric or battery powered and includes two modes of operation: a rotation mode and a rotation-hammer mode. A manually operable selector lever enables the hammer drill to be s... | 08/29/2006 |
| 7080816 | Raisable pedestal containing electronic components and water sensor for automatically lowering the same in the presence of precipitation A raisable pedestal includes an enclosed housing fixed to a ground surface; guide rods mounted within the housing; an inner shell mounted for movement along the guide rods between a retracted position entirely within the housing and an extended position extending ou... | 07/25/2006 |
| 7036608 | Apparatus for producing self-exciting hammer action, and rotary power tool incorporating such apparatus An apparatus for providing percussion action in a rotary power tool having a rotary output shaft, the apparatus comprising at least one moveable mass adapted to have a component of movement parallel to the axis of the rotary output shaft to cause impacts to be appli... | 05/02/2006 |
| 7021401 | Hammer An electrically powered hammer comprising a hammer housing (10,15) with a hollow cylindrical spindle (4) mounted within it and an air cushion hammering mechanism mounted within the spindle for generating repeated impacts on a tool or bit of the hammer ... | 04/04/2006 |
| 7013986 | Impact tool An impact tool enables a front cover part to be easily attached to and detached from a housing body, with a device having a simplified structure. The front cover part has an annular fastening portion clamped to the outer peripheral surface of a front edge portion of... | 03/21/2006 |
| 6955230 | Hammer drill and/or chipping hammer The invention is based on a hand power tool, in particular a drill- and/or chipping hammer, comprising a striking mechanism (10) that has a drivable pot-type piston (12) with at least one idle opening (14). It is proposed that the idle op... | 10/18/2005 |
| 6866105 | Electrical, fan-cooled tool An electrical tool includes a housing having inlet (7) and outlet (8) openings, a brushless electric motor (2) and an inverted rectifier (3) both arranged in the housing (9) between inlet (7) and outlet (8) openings i... | 03/15/2005 |
| 6722448 | Driving tool having an impacting device A driving tool includes a block and an impactor received in a front and a rear chambers of a handle, a driving shank attached to the block, and a plunger engaged between the block and the impactor. The impactor includes a cavity formed in one end for selectively rec... | 04/20/2004 |
| 6669072 | Flywheel operated nailer Disclosed and taught is a novel drive mechanism for a cyclic operating tool employing an energized flywheel to provide the necessary energy to perform a working cycle. The drive mechanism disclosed is particularly useful in hand tool applications such as ... | 12/30/2003 |
| 6484815 | Impact generator In a conventional impact generator, a grease receives centrifugal force by the rotation of a rotary member, thereby keeping away from surfaces of the rotary member and a weight. Consequently, insufficient lubrication is caused between the weight and a mem... | 11/26/2002 |
| 6386114 | Single shaft tamper with reciprocating rotational output A split tool tamper having a motor, a frame, a single tool shaft, and a tamping tool. The motor is coupled to the frame and the tool shaft is coupled to the motor. The tool shaft is further coupled to a single tamping tool.... | 05/14/2002 |
| 6192995 | Rotary impacting apparatus A rotary impacting apparatus is provided that includes a housing, a rotor rotatable about an axis, a main reciprocative implement and an impact member. The impact member is arranged to exert an impacting force on the main reciprocative implement when the ... | 02/27/2001 |
| 6182772 | Apparatus and method for driving posts into the ground A portable apparatus for driving a post into the ground is provided in an embodiment. The apparatus has a base removably attachable to the post as well as a hammer module tethered to the base to permit vertically reciprocating motion of the module relativ... | 02/06/2001 |
| 6127751 | Electric tool An electric tool including a hammer mechanism (9), a drive motor (11) for driving the hammer mechanism (9), a gear (10) for connecting the drive motor (11) with the hammer mechanism (9), a ventilator wheel (7) provided in an end region of the drive motor ... | 10/03/2000 |
| 6095256 | Hand-held pneumatic impact tool and method of controlling the same A hand-held pneumatic impact tool and method of controlling the same for use in fine hand working operations includes a handpiece, a foot-operated flow control valve and a hand operated flow control needle valve. The handpiece includes a housing having a ... | 08/01/2000 |
| 5868208 | Power tool A power tool has a drive mechanism with an output shaft which performs an intermittent rotary motion. The output shaft drives, via an overrunning clutch, a tool drive shaft to drive a tool, which thus performs a quasi-continuous rotary motion that, as the... | 02/09/1999 |
| 5816341 | Hammer mechanism A hammer mechanism (14) for a rotary drill (10) comprises a hollow piston (18), a drive (15,26) for effecting reciprocating motion of the piston (18) towards and away from an end portion (35) of a rotatable output spindle (13) of the drill (10) and a ram ... | 10/06/1998 |
| 5775441 | Power driven striking tool An airflow regulation arrangement for regulating the impact of the strikes delivered from a striking member (6) to an intermediate member (10) and a bit, thus reducing the vibration, and also for regulating the impact of recoils of the striking member (6)... | 07/07/1998 |
| 5540275 | Single impact rapping hammer system and method for cleaning tube units A rapping hammer system adapted for periodically rapping and cleaning tubes of a heat exchanger unit to remove undesired deposits from outside the tubes. A plurality of rapping hammers are each pivotably attached to a radial arm extending outwardly from a... | 07/30/1996 |
| 5465771 | Wood processing apparatus with impact hammer An apparatus is provided for delimbing tree limbs of a felled tree including housing structure constructed and arranged to be movable to a tree processing location. Support and feeding structure is constructed and arranged with respect to the housing stru... | 11/14/1995 |
| 5373905 | Hammer drill A hammer drill has a three-part hammering sleeve. A hardened tool socket is attached to a guide tube made of unhardened steel by an axial connection. For connection to the driving gearwheel, the guide tube furthermore carries a latching ring fixed on the ... | 12/20/1994 |
| 5125462 | Quick-change ram boring head In a ram boring machine that has a striking piston reciprocating in a tubular housing and a striking tip that may be formed as a chisel and projects from the housing, connection of the striking tip to the housing by means of a bayonet joint makes installa... | 06/30/1992 |
| 5117923 | Hydraulic jackhammer The hydraulic jackhammer is provided with a rotor turbine which is driven by a liquid stream in order to activate the tup for driving against a jumper rod. After passing by the turbine rotor, the liquid stream is mixed with air and passed through a nozzle... | 06/02/1992 |
| 5088567 | RAM device with eccentric drive The yam device has a plurality of guides and a striking mass which is movable so as to be displaceable thereat by means of a hydraulic cylinder, wherein the hydraulic cylinder is arranged with its longitudinal axis outside the path of the center of gravit... | 02/18/1992 |
| 5052497 | Apparatus for driving a drilling or percussion tool This invention relates to a device for driving a drilling or percussion tool having a spindle that rotates with respect to a housing. One end of the spindle is adapted to fasten to a tool piece and the other end is connected to an osciliating percussion b... | 10/01/1991 |
| 4867250 | Pneumatic impact imparting tool An improved pneumatic impact imparting tool includes a follower which is slidably accommodated in a recess formed on the inner end part of a rotor in a pneumatic motor. The follower is formed with a projection for moving a ball around a cam face as it is ... | 09/19/1989 |
| 4770254 | Rotary hammer with body having detachable sections A rotary hammer has a hammer body with an electric motor section which comprises a receiving section for receiving transmission mechanisms in a frame which serves as a shell barrel. A driving electric motor is installed in the shell barrel. The body also ... | 09/13/1988 |
| 4754539 | Method and extractor device for separating worm elements of an extruder from a worm shaft An extractor for removing worm elements which are fastened for rotation on the worm shaft of a worm extruder wherein a frame formed of longitudinal and cross members has a locking device in one of the cross members for holding the worm elements and an opp... | 07/05/1988 |
| 4751970 | Angular attachment for transmitting and deviating output power of a machine An angular attachment to a rotary and percussive power machine, such as a hammer drill, includes a rotary power input tubular member driven by a rotary part of the power machine, a tubular power output supported for rotation at an angle relative to the ax... | 06/21/1988 |
| 4744423 | Piezoelectric high voltage impact mechanism The present invention relates to a new and improved piezoelectric high voltage impact mechanism including a hollow housing means having groove means with two portions and a shoulder portion at their juncture, provided on its inner surface, an actuator mea... | 05/17/1988 |
