The disclosure provides a work tool having an electric motor, a power transmission means that receives motive power from the electric motor and transmits the motive power to a tip tool, a gear housing for accommodating at least a portion of the power transmission means, weights swingably supported on the gear housing, and coil springs that function as an urging means for urging the weights such that the weights are located at an initial neutral position, wherein the weights and the coil springs are provided respectively on the two sides of the gear housing so as to put the power transmission means therebetween, and a rotational support axle is provided that functions as a connecting means for connecting the weights provided on both sides of the gear housing so as to connect the weights such that the weights swing integrally.

The striking pin (16) is arranged in a bearing (29). The striking pin (16) has a circumferential surface (25) and a stop surface (27) facing in the striking direction (11). The bearing (29) has a sleeve (30) arranged coaxially to the working axis (10) as well as a catcher (32). The circumferential surface (25) of the striking pin (16) is installed so as to slide on the inside of the sleeve (30). The catcher (32) is arranged in the striking direction (11) of the stop surface (27) of the striking pin (16) in order to limit the movement of the striking pin (16) in the striking direction (11). A connecting link (35) is provided for purposes of causing the striking pin (16) to execute a rotation relative to the bearing (29) when the striking pin (16) moves in the striking direction (11). The connecting link (35) has a flank (42; 53) on the striking pin (16) and another flank (49; 52) on the bearing (29), whereby the two flanks (42; 53, 49; 52) that rest against each other during the movement rise in the striking direction (11) in the same circumferential direction (39).

A power tool that includes a housing, an electric motor, an input device, a reciprocation drive assembly, a striker, an anvil, and an electronic controller is provided. The electronic controller can control the electric motor based on a state of the input device. The electronic controller can receive a first signal from the input device, the first signal indicating a first constant speed of the electric motor, and, in response to the first signal, set an operational speed of the electric motor to the first constant speed. The electronic controller can further receive a second signal from the input device, the second signal indicating a second constant speed of the electric motor that is greater than the first constant speed, and, in response to the second signal, set the operational speed of the electric motor to the second constant speed.

A power tool includes a housing, an electric motor, a spindle, a retainer, a reciprocation drive assembly, a striker, and an anvil. The retainer is at least partially received into the spindle. The anvil includes a front anvil impact surface and a rear anvil surface opposite the front anvil impact surface. The retainer defines a retainer impact surface that contacts the front anvil impact surface in response to the anvil moving in a first direction along a reciprocation axis. The spindle defines a spindle impact surface that contacts the rear anvil impact surface in response to the anvil moving in a second direction opposite the first direction along the reciprocation axis. The retainer impact surface and the spindle impact surface limit a travel distance by which the anvil translates along the reciprocation axis.

A power tool includes a motor, a spindle defining a first end with a slot, and a crankshaft including a counterweight and a crank pin that are rotated by the motor about a crank axis so that at least one of the counterweight and the crank pin is rotated through the slot. The spindle includes a second end opposite the first end and defines a third distance taken between the first end and the second end of the spindle. The spindle further includes an anvil seat between the first end and the second end and defines a fourth distance between the anvil seat and the first end of the spindle. The power tool further includes an anvil received in the spindle, and the anvil defines a bit seat configured to receive a tool bit.

A rotary hammer includes a housing and a mode selection dial supported in the housing. The mode selection dial includes a cam. The housing supports a motor providing a rotational output. The housing supports a linkage moveable between a first position and a second position in response to engagement by the cam. A loss-of-control detection system measures acceleration of the housing and disables the motor upon the acceleration exceeding an acceleration threshold. The housing supports an operating mode detection system including a magnet and a Hall-effect sensor. The magnet is coupled to the linkage and moveable therewith between a third position corresponding to the first position of the linkage and a fourth position corresponding to the second position of the linkage. The Hall-effect sensor provides an output signal indictive of the position of the magnet. The loss-of-control detection system is selectively disabled based upon the output signal.

A portable power tool has a tool holder 2, a motor 8 and an electro-pneumatic striking mechanism 4. The striking mechanism includes an excitation piston 13, a striker 14, a pneumatic chamber 18 for coupling the striker 14 to the excitation piston 13 and an anvil 15 which is arranged in the striking direction 5 downstream of the striker 14 and is provided for transmitting a blow of the striker to the tool. The anvil is hollow. The hollow interior space 23 is closed in the striking direction 5 and counter to the striking direction 5.

A percussion tool includes a housing having a top end, a bottom end, a front end, and a rear end. The housing defines a barrel portion, a handle portion opposite the barrel portion, and a motor housing portion between the barrel portion and the handle portion. The percussion tool also includes an electric motor positioned within the motor housing portion and a percussion mechanism driven by the motor and including a striker supported for reciprocation in the housing. The striker defines a striker axis in a reciprocating direction. The percussion tool further includes a battery receptacle supported by the housing and a battery pack removably coupled to the battery receptacle for providing power to the motor. The battery pack and the battery receptacle define a battery axis extending longitudinally through the battery pack and battery receptacle. The striker axis and the battery axis are parallel.