A hand tool device has a hammer mechanism including a hammer, at least one curve guide which drives the hammer at least during the hammer drilling operation, and at least one hammer mechanism spring which (i) stores at least a part of an impact energy in at least one operating state, and (ii) holds the hammer in the peripheral direction in at least one operating state.

A method for producing impacts from rotary motion, the method including: inputting the rotary motion to an input shaft, converting the rotary motion to a linear motion; storing potential energy in one or more elastic elements resulting from the linear motion; and releasing the stored potential energy when the stored potential energy reaches a predetermined level to accelerate an impact mass to produce the impact.

A handheld machine tool has a drive motor for driving a tool holder, in which a tool is able to be accommodated. In addition, a cam-action mechanism for generating a hammer function is provided, which includes a cam-action mechanism holder and a notched disk. The cam-action mechanism holder is in contact with a heat-dissipating component situated inside the housing.

A handheld machine tool has a drive motor for driving a tool holder, in which a tool is able to be accommodated. In addition, a cam-action mechanism for generating a hammer function is provided, which includes a cam-action mechanism holder and a notched disk. The cam-action mechanism holder is in contact with a heat-dissipating component situated inside the housing.

A hammer drill has a body housing having a motor housing and a gear housing formed in one piece. An electric motor is fixed to the motor housing. A motion converting mechanism, a striking mechanism and a tool holder which form a striking mechanism part are housed in the gear housing so as to be movable with respect to the gear housing. During hammering operation, the striking mechanism part moves with respect to the gear housing under a biasing force of a coil spring, so that vibration caused by the hammering operation is reduced.

A power tool includes a motor housing and a motor supported within the motor housing. The motor includes an output shaft defining an axis. The power tool also includes a bearing configured to support the output shaft for rotation about the axis, an end cap removably coupled to the motor housing, and a bearing retainer integrally formed with the end cap. The bearing retainer is configured to axially and radially secure the bearing to the end cap.

A power tool, such as a rotary hammer, includes a housing, an output shaft for mounting a tool accessary and a motor having a motor shaft that generates a rotational output for rotating and linearly hammering the output shaft. The rotational output of the motor shaft is coupled to the output shaft via a driving mechanism that includes a hammer mechanism. An intervening member is axially movable relative to the motor shaft and is operably coupled between the motor shaft and the hammer mechanism. The hammer mechanism and the output shaft are supported by a movable support that is axially movable relative to the housing. Because the output shaft and the driving mechanism are movable relative to the motor and the housing, which preferably includes handle, via the intervening member and the movable support during hammering operations, vibration generated during hammering operations can be dampened before reaching the housing.

A power tool, such as a rotary hammer, includes a housing, an output shaft for mounting a tool accessary and a motor having a motor shaft that generates a rotational output for rotating and linearly hammering the output shaft. The rotational output of the motor shaft is coupled to the output shaft via a driving mechanism that includes a hammer mechanism. An intervening member is axially movable relative to the motor shaft and is operably coupled between the motor shaft and the hammer mechanism. The hammer mechanism and the output shaft are supported by a movable support that is axially movable relative to the housing. Because the output shaft and the driving mechanism are movable relative to the motor and the housing, which preferably includes handle, via the intervening member and the movable support during hammering operations, vibration generated during hammering operations can be dampened before reaching the housing.

Disclosed herein are surgical impact tools and methods of use thereof. The surgical impact tools can include a roller assembly, an impact structure, and a tool holder. The roller assembly can be connected to a motor and include a plurality of rollers supported by a respective roller arm. The impact structure can define a spring and an impact cavity including forward and reverse impact surfaces. The impact structure can include a wall comprising a plurality of thread elements connected to the wall and engageable with the roller assembly. Each of the thread elements can include a pair of helical end surfaces and a pair of axially extending surfaces that are engaged by the plurality of rollers. During use rotation of the roller assembly against the helical ends of the thread elements can cause axial movement of the impact structure to apply a load on the spring and generate impact forces.

A hammer drill includes a tool housing including a motor housing portion; a motor in the motor housing portion; an output spindle driven by the motor; a clutch housing; and a hammering mechanism including a first ratchet and a second ratchet. The hammering mechanism is configured to impart axial impacts to the output spindle. The hammer drill further includes an insert in the clutch housing. The insert includes a body and a plurality of legs extending from the body.