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| Number | Title | Issue Date |
| 7823654 | Electric post driver An impact driver for driving elongate objects into a body has, a chassis, a ram supported by the chassis in a manner allowing rectilinear movement of the ram relative to the chassis between two limits, and a linear induction motor. The linear induction motor has a s... | 11/02/2010 |
| 7503400 | Two shot power nailer A nail gun includes a power coil for moving a plunger in two opposed directions. The plunger is first moved away from a nail, and force from this movement is stored in a force storage mechanism. The plunger is then driven by the coil in an opposed direction, and the... | 03/17/2009 |
| 7410085 | Electrical drive-in tool A drive-in tool for driving in fastening elements includes a driving ram (13) displaceable in a guide (12) and driven by a drive flywheel (32), a drive unit (30) having an electric motor (31) for rotating the drive flywheel (32 | 08/12/2008 |
| 7398834 | Hammer drill with selective lock-on A hammer drill comprising: a motor; a drive transmission capable of operating in at in at least a rotary mode and a reciprocating mode; a mode change mechanism; a switch which, when closed, provides power to the motor; and a mechanical lock-on mechanism which, when ... | 07/15/2008 |
| 7383893 | Electric hammer drill It is an object of the present invention to provide an effective technique to alleviate vibration in the electric hammer drill. According to the invention, representative electric hammer drill is provided with a body, a motor, a striker, a cylinder, first and second... | 06/10/2008 |
| 7357194 | Percussion power tool A percussion power tool includes a motor (6) located in the tool-housing (4) for driving the output member (12) and the percussion mechanism (10), a chuck (20) for receiving a working tool (22), a locking mechanism (24 | 04/15/2008 |
| 7331407 | Vibration reduction apparatus for power tool and power tool incorporating such apparatus A vibration reduction apparatus for use with a hammer tool having a hammer piston is disclosed. The hammer piston is caused to reciprocate in the cylinder by rotation of a gear wheel and crank drive. A cam is mounted around the gear wheel, a counterweight surrounds ... | 02/19/2008 |
| 7308950 | Drilling and/or hammering tool A hand held electrically powered drilling and/or hammering tool comprises a balanced motor sub-assembly including a radial fan mounted to the armature shaft at a first end of the motor with the fan blades facing away from the motor, and motor the sub-assembly is mou... | 12/18/2007 |
| 7258173 | Electric power tool An electric power tool includes a percussion mechanism (15) located in an external housing (12) of the power tool (11) and driven by a driving motor (13) connected with the percussion mechanism (15) by a gear unit (14). An a... | 08/21/2007 |
| 7252155 | Percussive power tool with flushing head A power tool (1) having a striking means (5), by which a percussive tool (2) that can be driven at least partially along an axis (A) struck directly and having a flushing bore (4) extending at least partially longitudinally through a tool... | 08/07/2007 |
| 7238095 | Pneumatic grinder with improved muffling structure A pneumatic grinder with improved muffling structure primarily comprises a driving portion, a grinding wheel fixing portion provided at one end of the driving portion, a first housing connected to the other end of the driving portion by means of a combining portion,... | 07/03/2007 |
| 7216723 | Pulse torque generator and power tool having the same A pulse torque generator utilizing a magnetic coupling, and an electric power tool provided with the pulse torque generator. The pulse torque generator includes an input shaft extending in its axial direction and having a hollow section providing a hollow space, and... | 05/15/2007 |
| 7211932 | Apparatus for megasonic processing of an article A transducer assembly used for the megasonic processing of an article. In one aspect, the transducer assembly comprises: a vibration transmitter having a rear portion adapted to be supported adjacent to an article to be processed and having an elongated forward port... | 05/01/2007 |
| 7204322 | Power tool having pneumatic vibration dampening It is an object of the present invention to provide a vibration reducing technique caused by air pressure fluctuations within a power tool. According to the present invention, a representative power tool may comprise a driving motor, a driver and a tool bit. The dri... | 04/17/2007 |
| 7140450 | Percussion tool A percussion tool is described and which includes a housing mounting a tool bit; a reciprocally moveable hammer borne by the housing and which is operable to repeatedly strike the tool bit; and a reciprocally moveable piston enclosed within the hammer and which impa... | 11/28/2006 |
| 7137458 | Impact mechanism for a hammer drill An impact mechanism for a hammer drill, which has a housing and a drill bit protruding outside the housing, is provided. The mechanism includes firstly an impact platform within the housing; the impact platform is in connection with the drill bit for receiving impac... | 11/21/2006 |
| 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 |
| 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 |
| 7090032 | Electric power tool An electric power tool includes a housing, an inner case and a hammer case. The housing receiving a motor has a pair of half portions. The inner case receives a planetary gear train. An input side of the planetary gear train is connected to a drive shaft of the moto... | 08/15/2006 |
| 7086575 | Magnetically operated driving tool A magnetically operated driving tool includes a body member, first and second stator magnets at opposed ends with like poles facing one another, a movable magnet (traveler), a coupling adjacent each stator coupled to a user-operable linkage, a hammer, and a spring. ... | 08/08/2006 |
| 7059425 | Reciprocating power tool It is an object of the present invention to provide a reciprocating power tool having a further improved power transmission mechanism for converting a rotating output of a driving motor into linear motion in the axial direction of the tool bit. According to the pres... | 06/13/2006 |
| 7059423 | Jackhammer system A jackhammer system for reducing the vibration and noise experienced by an operator of the jackhammer. The jackhammer system includes a housing, a chisel movably positioned within a lower neck of the housing, a pair of flywheels rotatably attached to a pair of suppo... | 06/13/2006 |
| 7025183 | Pneumatic spring percussion mechanism with an electro-dynamically actuated driving piston The invention relates to a pneumatic spring percussion mechanism comprising a driving piston moving back and forth in a housing of the percussion mechanism and a percussion piston, wherein a pneumatic spring is configured between the driving piston and the percussio... | 04/11/2006 |
| 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 |
| 6955282 | Magnetically operated driving tool A magnetically operated driving tool includes a body member, first and second stator magnets at opposed ends of the body with like poles facing one another, a movable magnet (traveler), a coupling adjacent each stator coupled to a user-operable linkage, a hammer, an... | 10/18/2005 |
| 6938704 | Pneumatic percussive tool with a movement frequency controlled idling position The invention relates to a pneumatic percussive tool for a paving breaker and/or a hammer drill comprising a drive piston which is displaceable both backwards and forwards by a crankshaft and arranged in a percussion piston which is displaceable both backwards and f... | 09/06/2005 |
| 6918325 | Electric wrench for vehicle repairing The present invention relates to an electric wrench for vehicle repairing which comprises a DC driving motor, transmission gears, a clutch, a power accumulator and a transmission shaft. When the DC driving motor rotates, it will drive the transmission gears which wi... | 07/19/2005 |
| 6918449 | Magnetic impact tool There is provided a magnetic impact tool comprising a magnetic hammer driven by a motor, a magnetic anvil disposed so as to face the magnetic hammer, an output shaft that rotates together with the magnetic anvil, a magnetic bypass device for distributing magnetic fl... | 07/19/2005 |
| 6907943 | Electric hammer It is, accordingly, an object of the present invention to provide an electric hammer with improved construction, while ensuring the vibration reduction performance. According to the present invention, a representative electric hammer may include a hammer bit, a driv... | 06/21/2005 |
| 6907942 | Percussion tool In a percussion tool such as an electric hammer or a hammer drill in which the axial direction of a motor 8 is substantially perpendicular to that of a tool bit 1 attached to a tool holder 2, a motor housing 3 is made of a hard material s... | 06/21/2005 |
| 6868918 | Power tool driven by linear motor A power tool includes a linear motor and a maximum reciprocal movement amount setting unit. The linear motor has a movable member driven to move reciprocally and a tool connector for connecting work bits to the movable member. The maximum reciprocal movement amount ... | 03/22/2005 |
| 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 |
| 6854530 | Method for driving electric percussion tool A method for driving an electric percussion tool which includes a solenoid, a plunger core partially engaged in one end of the solenoid, and a spring disposed out of the solenoid and closer to the other end of the solenoid and distal to the plunger core. The solenoi... | 02/15/2005 |
| 6830173 | Impact device An impact device (10) employing a novel direct electric propulsion system. The device operates by placing a conductive piston (23) adjacent to an electric coil (18) then rapidly releasing electrical energy stored in a capacitor (17) to en... | 12/14/2004 |
| 6758288 | Rotary-percussion electrical tool A percussion electrical tool including an electrical motor (6) located in a firedamp-protected housing (6), control electronics (4) for controlling operation of the electric motor (6); an inverted rectifier (5) connecting the contr... | 07/06/2004 |
| 6729412 | Power tool driven by linear motor A power tool includes a linear motor and a maximum reciprocal movement amount setting unit. The linear motor has a movable member driven to move reciprocally and a tool connector for connecting work bits to the movable member. The maximum reciprocal movement amount ... | 05/04/2004 |
| 6725945 | Impact tool with improved operability An impact driver (1) includes a main housing (2) encasing a motor (5); an internal gear case (8) which is secured by screws to the main housing (2) and is provided with an externally threaded portion (12); and a hammer case ... | 04/27/2004 |
| 6712156 | Switch assembly for a combined hand tool device A switch assembly (1) for centrally arranged operating mode selection for an at least partially rotary and percussion combination hand tool device (2) is comprised of a first switch sleeve (11) for the switchable percussion drive (6) and ... | 03/30/2004 |
| 6695070 | Magnetic impact device and method for magnetically generating impact motion A magnetic impact device includes at least one hammer relatively movable with respect to at least one chuck. One of the at least one hammer and the at least one chuck has at least one magnet. Another of the at least one hammer and the at least one chuck h... | 02/24/2004 |
| 6564882 | Electromagnetic hammer having a moving ferromagnetic mass The invention relates to an electromagnetic hammer having a moving ferromagnetic mass, the hammer being of the type comprising a tube of non-magnetic material for standing on an element that is to be driven into the ground, said tube being surrounded by a... | 05/20/2003 |
