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| Number | Title | Issue Date |
| 8011443 | Striking mechanism for a handheld power tool The invention is a striking mechanism for a handheld power tools in particular electric hammer. A piston is arranged in an axially bidirectionally movable manner in a guide tube. A striker is provided which acts on a striking pin and which is held in a movable manne... | 09/06/2011 |
| 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 |
| 7328753 | Hydraulic breaking hammer with lubricated implement guide sleeve A hydraulic breaker hammer includes a housing with a longitudinal bore, a cylinder sleeve, and a rear end cover engaging the cylinder sleeve. A hammer piston is reciprocally powered in the cylinder sleeve for delivering blows to a working implement inserted in a gui... | 02/12/2008 |
| 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 |
| 7156190 | Impact tool An impact tool has a slidable hammer that is driven by hydraulic oil under pressure inside a chamber. The hydraulic oil is pressurized by a piston driven by compressed gas on the opposite side of the piston from the hydraulic oil. The gas in the gas chamber is compr... | 01/02/2007 |
| 7124840 | Engine breaker An engine breaker includes a vertically extending cylindrical main body (1), a work member (2) supported by a lower portion of the main body for up and down movement, an engine (5) mounted to an upper portion of the main body and having an outpu... | 10/24/2006 |
| 7080696 | Motor mounting and sealing arrangement for a power tool A hand held electrical tool includes a gear casing for housing a drive mechanism, which gear casing comprises an entrance. The tool's motor includes an armature shaft having an end at which a pinion is formed for engaging the drive mechanism. A motor plate having a ... | 07/25/2006 |
| 6997269 | Attachment for impact hammer An attachment for an impact hammer for translating the hammer's typical forwardly directed impact force into a rearwardly directed pulling force while still allowing the user to maintain a conventional orientation of the hammer relative to the work piece intended to... | 02/14/2006 |
| 6966390 | Pile hammer A power tool (1) has a percussive driving implement for driving an impact tool (8). The driving implement, which may be hydraulic or pneumatic, retracts the impact tool (8) on its return stroke, against the force developed by heavy-duty elastic ... | 11/22/2005 |
| 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 |
| 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 |
| 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 |
| 6698531 | Vibration tamper A hand-guided vibration tamper, which is driven by a motor laterally cantilevered on the tamper head, is provided with guard plates covering its underside and lateral sides. The underside and lateral guard plates are connected to a housing for the motor, ... | 03/02/2004 |
| 6119796 | Pneumatic spring percussion mechanism with an air supply A double action pneumatic spring percussion mechanism has an air supply mechanism. A percussion piston is movable with a driving piston. In an air-supply position, ambient air is supplied through an air inlet to a front pneumatic spring. When the percussi... | 09/19/2000 |
| 5813479 | Trigger mechanism for impacting device A device for breaking concrete and similar frangible materials to reduce it to rubble includes a power plunger and a trigger mechanism mounted within a casing. The casing may be carried on and operated by construction equipment such as a back hoe. The tri... | 09/29/1998 |
| 5662177 | Trigger mechanism for impacting device A device for breaking concrete and similar frangible materials to reduce it to rubble includes a power plunger and an actuator plunger mounted within a casing. The casing is carried on and operated by construction equipment such as a back hoe. As the back... | 09/02/1997 |
| 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 |
| 5097912 | Staking system for concrete forms An upright guide bar is provided having upper and lower ends and the lower end include structure for releasable engagement with the upper end portion of an upstanding stake to be driver downwardly. A downwardly opening drive housing having upper and lower... | 03/24/1992 |
| 5052498 | Portable hammer machine A portable hammer machine comprises a cylinder (11) in which a reciprocating drive piston (40) via a gas cushion in a working chamber (44) repeatedly drives a hammer piston (15) to impact on and to return from a tool (20) carried by the machine as soon as... | 10/01/1991 |
| 4609054 | Anti-noise impact element An impact element having the effect of elongating the pulse of force in impact tools and devices for chipping, hammering and similar operations, consisting of an element (8) which, for generating the striking motion, is axially moveable as a whole and com... | 09/02/1986 |
| 4557336 | Alignment mechanism for ram type compactors A mechanism for maintaining alignment between the gear case or upper portion of a ram type compactor and the spring housing and shoe or lower portion of the compactor which includes a square guide tube and a square hole at the top of the spring housing wh... | 12/10/1985 |
| 4436163 | Arrangement for converting rotary motion to reciprocatory motion A power operated tool includes a prime mover, an output member and a power transmission mechanism arranged to transmit rotary motion of the prime mover to a reciprocatory output member. The power transmission mechanism includes a first member mounted for ... | 03/13/1984 |
| 4428439 | Adjustable, portable, hand-held impactor By providing an inexpensive, easily manufactured coil spring member as a cam surface which is spring biased and is controllably, reciprocatingly axially cycled by a rotating cam follower, an inexpensive, continuous operable, fail-safe, dependable, portabl... | 01/31/1984 |
| 4366869 | Hammer drill A hammer drill is arranged to rotate and also apply percussive force to a tool receptacle. The percussive force is transmitted from a shaft to a drive piston which, in turn, reciprocates a percussion piston which drives the tool receptacle. The hammer dri... | 01/04/1983 |
| 4346767 | Rotary impact drill A portable electric hammer drill incorporates an electric motor 12 disposed close to the handle 13 of the tool and with its axis of rotation at right angles to the axis of rotation of the drill bit holder 10, and a gear 15 on the motor shaft meshes with a... | 08/31/1982 |
| 4346768 | Impact device with sinusoidal rotary-to-reciprocative converter The rotary output of the power source of an impact device is converted to reciprocation of a body, preferably having a resilient coupler, which drives a ram into impacting in an improved rotary-to-reciprocative motion converter including a crankshaft oper... | 08/31/1982 |
| 4346769 | Percussive tool drive linkage A percussive tool has a percussion mechanism driven by a linkage that combines the simplicity of a connecting rod drive with the compactness of more complex drives. A first member, which may be a crank, drives a second member, which may be a cylinder, mou... | 08/31/1982 |
| 4336847 | Percussion drill A percussion drill comprises an open-ended, hollow cylinder having an air exhaust hole on the side wall thereof, a piston mounted in the rear end portion of the cylinder, and a slide shaft mounted in the front end portion of the cylinder. A drill bit is r... | 06/29/1982 |
| 4325436 | Hammer drill or chipping hammer device In a device which can be used as a hammer drill or a chipping hammer, a percussion mechanism is located within a working cylinder in the housing of the device. A tool can be placed in one end of the working cylinder and the tool can be rotated without any... | 04/20/1982 |
| 4310055 | Percussion hammer with a one piece striker A hand-held power tool has a tool holder, a tool axially reciprocable in the tool holder, and a striking mechanism including a drive piston and a striker having a disc-shaped plate with a small axial dimension and a striker shaft having a cross sectional ... | 01/12/1982 |
| 4290492 | Idling and air replenishing system for a reciprocating hammer mechanism An improved air replenishing and idling system for a reciprocating hammer type tool having an outer housing and reciprocal drive mechanism, comprising an elongated barrel mounted within that housing. The barrel includes an axially disposed, air passageway... | 09/22/1981 |
| 4276941 | Hand-held power tool A hand-held power tool has a tool holder for holding a tool, a striking mechanism including a cylindrical sleeve, a drive piston reciprocable in the sleeve, and a striker actuated by the latter, and a drive motor located axially parallel with and laterall... | 07/07/1981 |
| 4201269 | Impact device with linear single acting air spring An impact device incorporating an improved air spring coupler in the form of a novel cylinder-piston is disclosed, in which the air spring is linear, i.e., the air spring stiffness is substantially constant over the operating range of the air spring displ... | 05/06/1980 |
| 4183414 | Percussion tool and cartridge-type oil tank therefor A pneumatic hammer, hammer drill or like percussion tool incorporating a cartridge-type oil tank detachably installed in the main body of the tool. The oil tank is made of transparent or semitransparent material and held from outside by a holding plate fo... | 01/15/1980 |
| 4166507 | Percussive drilling apparatus A hydraulic rotary percussive drill which is adapted to operate as a drill for installing rock bolts in mines is described. The drill is configured so that the shank (which holds the drill steel and bit) forms a right angle with the impact mechanism, ther... | 09/04/1979 |
| 4156468 | Housing for electric tools The housing for electric tools comprises a one-piece plastic construction and includes a handle part and a hollow housing part having a metal jacket therein which defines various cavities and bearing bushes and bores for the elements of a drive motor and ... | 05/29/1979 |
| 4114699 | Pneumatic rotary hammer device A hammer drill has a motor-actuated drive piston and a free percussion body accommodated in a common, stationary cylinder. The percussion body is caused to move back and forth by the drive piston with air as the coupling and buffer medium. The hammer dril... | 09/19/1978 |
| 4102410 | Resilient work-coupled impact device An impact device, incorporating power drive means having a resilient drive element for generating successive ram impacts against a tool by reaction of the resilient drive element against the device frame, incorporates resilient bias means, interposed betw... | 07/25/1978 |
| 4099580 | Impact device with linear air spring An impact device incorporating an improved air spring coupler in the form of a novel cylinder-piston is disclosed, in which the air spring is linear, i.e., the air spring stiffness is substantially constant over the operating range of the air spring displ... | 07/11/1978 |
| 4095654 | Impact device with multiple connecting rods and gearing Rotary-powered exciter-reciprocative means are disclosed by which improvements in efficiency and effectiveness of impact devices, effected by important reductions of wasteful extraneous harmonic vibrations through the use of long double connecting rods, a... | 06/20/1978 |
