A rotary hammer includes a motor, a spindle coupled to the motor for receiving torque from the motor, a piston at least partially received within the spindle for reciprocation therein, and an anvil received within the spindle for reciprocation in response to reciprocation of the piston. The anvil imparts axial impacts to a tool bit in response to reciprocation of the piston. The rotary hammer also includes a bit retention assembly for securing the tool bit to the spindle. The bit retention assembly includes a collar with an indicator thereon. The indicator is at least partially visible to a user of the rotary hammer when the tool bit is improperly inserted within the spindle.

A machine tool is disclosed. The machine tool has a tool receptacle for receiving a tool on a working axis, a housing, and a striking mechanism. An impact stop is provided for a beater or an intermediate beater. An impact absorber has two polymer-based absorber rings that are offset axially to one another and are disposed so that they overlap radially and has two iron-based disks disposed axially between the absorber rings.

A hand-held power tool has a tool socket 2 to hold a tool on a working axis 11. A pneumatic striking mechanism 6 has an exciter piston 13 that is forced to move periodically along the working axis 11 by a motor 5 and it also has a striker 14 that is coupled to the exciter piston 13 via a pneumatic chamber 18. The exciter piston 13 has a cylindrical main body 21 made of a polymer. One or more rings 24 containing copper surround the main body 21. The rings 24 protrude from the main body 21 in the radial direction.

The present disclosure relates to an electric tool, including a housing, a motor accommodated in the housing, a transmission mechanism, and an impact mechanism, where the impact mechanism includes an air cylinder, and an impact rod, a guide device, an impact hammer, and a piston arranged in the air cylinder; and when the impact rod moves along a direction opposite to an output direction, a second guide part sequentially supports a third section and a second section greater than the third section in diameter.

An electropneumatic impact mechanism for an electric hand-held power tool, in particular a hammer drill and/or chipping hammer, wherein the impact mechanism has a transmission housing, a guide tube arranged at least partially in the transmission housing, an exciter piston that is movable in the guide tube, a connecting rod coupled to the exciter piston, and an eccentric wheel which is designed as an externally toothed gearwheel and is coupled to the connecting rod on one side and is mounted so as to be rotatable with respect to the transmission housing about an axis of rotation on the other side, an axial gap, preferably for optionally receiving at least part of a lubrication space separating element, is provided between an eccentric wheel surface facing the connecting rod and a connecting rod surface facing the eccentric wheel.

Tool fitting device for a power tool, in particular a chipping hammer, includinga holding device for receiving and holding a tool shank, a retention element extending at least around a section or sections of the holding device, and a dust protection device for preventing the penetration of dust into the tool fitting device. The dust protection device includes at least one first dust stripping element, at least one fixing bead, and at least one sealing lip element, wherein the sealing lip element is positioned in front of the retention element in the axial direction. Dust protection device for use in a tool fitting device.

The present disclosure relates to an electric tool, including a housing, a motor accommodated in the housing, a transmission mechanism, and an impact mechanism, where the impact mechanism includes an air cylinder, and an impact rod, a guide device, an impact hammer, and a piston arranged in the air cylinder; and when the impact rod moves along a direction opposite to an output direction, a second guide part sequentially supports a third section and a second section greater than the third section in diameter.

A pneumatic hammer extender arm assembly is provided comprising an elongated extender arm body defining a hammer engaging portion formed at a first end of the body, and a hammerhead engaging portion formed at a second end of the body. A hammerhead is detachably engageable to the hammerhead engaging portion to allow for quick change of the hammerhead without the need for any tools. The hammerhead may alternately be implemented to engage and apply an impact force to a fastener that may be axially offset from the extender arm body.