Systems and methods for management of material stresses present at transitions between facets of an anvil and the anvil shaft are described. In one aspect, an apparatus includes an impact tool anvil extending along an axis of extension and having a faceted drive end and a shaft body which is connected to the faceted drive end through a transition region that couples respective faces of the faceted drive end to the shaft body, the transition region including a sweeping radius surface having a first axial end and a second axial end, the first axial end connected to a respective face of the faceted drive end, the first axial end having a tangency with the respective face of the faceted drive end; and an angular transition having a slope that radially rises from the second axial end of the sweeping radius surface to the shaft body.

Provided is a work tool that can work suitably in cooperation with an attachment device connected to a main body of the work tool to enhance work efficiency. The work tool includes a main body 2, and a control circuit 71 configured to provide control over the main body 2. The main body 2 includes a motor 3, an end-bit mount portion 10 and an end bit 14 as a work part configured to be driven by the motor 3 to perform a work. A dust collector 100 is connectable to the main body 2 to assist the work. The control circuit 71 is configured to detect whether the dust collector 100 is connected to the main body 2 and change the control over the main body 2 based on whether the connection is established or not.

A portable machine tool, particularly a hammer drill and/or chisel hammer, has a length, a width, a height and a mass. The portable machine tool has at least one energy storage unit that has a charge carrier capacity and a quick-change tool holder for quick-change tools with a shaft diameter of less than 12 mm. A product formed from the length, the width, the height, the mass and the inverse of the charge carrier capacity is less than 1301 cm.sup.3 kg A h.sup.1.

An attachment includes a body, an impact portion defining an impact axis and configured to receive repeated impacts from the powered hammer, and a driving portion including a side load driving portion and a top load driving portion that alternately receive the rod to transmit driving forces from the repeated impacts to the rod. The side load driving portion defines a side load driving axis that is offset from the impact axis. The top load driving portion includes a blind bore and defines a top load driving axis that is coaxial with the impact axis. The top load driving portion includes a sleeve disposed within the blind bore and configured to decrease wear of the blind bore during use.

A setting tool includes an anchor rod holder (31) open toward a front side of the setting tool, and a drill holder (41) that is open toward a rear side of the setting tool. The setting tool includes a passage (3) through which an anchor rod (10) accommodated in the anchor rod holder (31) may be directly, axially acted on percussively by a drill (20) accommodated in the drill holder (41). Moreover, a fastening arrangement that includes such a setting tool is provided.

A portable power tool has an exciter piston guided along a movement axis in a guide tube and a striker coupled to the exciter piston. A connecting rod is fastened to a piston pin in the exciter piston and to an electric motor. A bearing for supporting the piston pin is formed by a piston head of the exciter piston and a closure plate inserted into the exciter piston. A rotary closure is formed by a groove, extending in a direction of rotation about the movement axis, in the piston wall and by a radially protruding fin on the closure plate. A detent for locking the fin counter to the direction of rotation is pivotable in the radial direction between a locking position and a releasing position. The detent is deflected beyond the external dimensions of the piston wall in the radial direction in the releasing position.

A tool connection (9, 47) for connecting a tool (1) to a tool support (16), the tool connection (9, 47) including at least one radial shock absorber (19, 20) for at least partially absorbing shock imparted by the tool (1) via the tool connection (9, 47). The radial shock absorber (19, 20) has shock absorbing assemblies (22, 23), each including at least two elastic layers (24) and at least one inelastic layer (25) interleaved between the elastic layers (24). The layers (24, 25) of the shock absorbing assemblies (22, 23) are radially distributed with respect to a connection axis (10, 11) passing through the tool connection (9, 47), the shock absorbing elastic layers (24) including an inner elastic layer (24) and an outer elastic layer (24) radially proximal and distal respectively to the connection axis (10, 11).

A hand-held power tool, in particular a hammer drill or a combined hammer, includes a safety coupling via which torque transmission between a motor shaft and a transmission shaft of the hand-held power tool can be established and interrupted. The safety coupling includes a coupling part at the input end and a coupling part at the output end and can be actuated by a coupling actuator. Mutually complementary catch profiles, in particular similar to a crown gear set, by which the coupling part at the input end and the coupling part at the output end can be interlocked, are arranged on the coupling part at the input end and on the coupling part at the output end.

A method for tightening or loosening components of a hammer assembly is comprises inserting a tool into an aperture defined by at least one component of the hammer assembly in order to engage the drive structure of a tensioning member, moving the drive structure of the tensioning member, and moving at least one draw member operatively associated with the tensioning member.

An impact tool is provided which has a driving mechanism 120, 140 that drives a tool bit 119, a motor 110 that drives the driving mechanism 120, 140, an inner housing 103 that houses the driving mechanism 120, 140, an outer housing 101 that has an internal space for housing the inner housing 103 and the motor 110, an opening 193 that leads from the outside to the internal space of the outer housing 101, and a covering member 195 that covers the opening 193.