Provided is a rotary tool with a compact tip tool holding portion (80). The rotary tool is provided with a sleeve (81) attached to an output shaft (41) to switch a tip tool (70) between a fixed state and a detachable state. The output shaft (41) has a through hole (46) formed therein radially penetrating from the inside to the outside of a mounting hole thereof. The through hole (46) has a steel ball (85) provided therein such that at least a part of the steel ball (85) overlaps at least a part of a case (10). The sleeve (81) defines a first position in the outward direction of the steel ball (85), while the case (10) regulates a second position on the radially outer side of the first position.

Provided is a rotary tool with a compact tip tool holding portion (80). The rotary tool is provided with a sleeve (81) attached to an output shaft (41) to switch a tip tool (70) between a fixed state and a detachable state. The output shaft (41) has a through hole (46) formed therein radially penetrating from the inside to the outside of a mounting hole thereof. The through hole (46) has a steel ball (85) provided therein such that at least a part of the steel ball (85) overlaps at least a part of a case (10). The sleeve (81) defines a first position in the outward direction of the steel ball (85), while the case (10) regulates a second position on the radially outer side of the first position.

A motor module and an electric powered tool using the motor module, which comprises: a motor, a cooling fan mounted on the rotor of the motor, and a control circuit board to control the motor, wherein, the cooling fan is located between the motor and the impact output module. In the present invention, the cooling fan is configured on the front end of the motor, and the control circuit board is configured on the rear end of the motor, thus the rotary shaft of the motor does not need to go through the control circuit board. Therefore, the control circuit board does not need to provide a through hole for the rotary shaft to go through, and the control circuit board can have a larger area.

A motor module and an electric powered tool using the motor module, which comprises: a motor, a cooling fan mounted on the rotor of the motor, and a control circuit board to control the motor, wherein, the cooling fan is located between the motor and the impact output module. In the present invention, the cooling fan is configured on the front end of the motor, and the control circuit board is configured on the rear end of the motor, thus the rotary shaft of the motor does not need to go through the control circuit board. Therefore, the control circuit board does not need to provide a through hole for the rotary shaft to go through, and the control circuit board can have a larger area.

A retaining device to secure a socket to an anvil using provided socket holes and anvil hole, including an O-ring and an integral projecting member extending inwardly from the O-ring, the projecting member having a cross-sectional diameter that conforms with the diameter of the holes in the socket and anvil. The O-ring, though integrally formed with the projecting member, is formed at a reduced cross-sectional diameter so that the overall retaining device can be stretched onto a wider range of socket sizes. The preferred projecting member includes a full-length crush gauge that is positioned in at least one of the juxtapositions between the socket holes and the anvil hole.

A signal processing apparatus for an electric tool is provided for generating a motor control signal for controlling a motor by performing a smoothing process on a torque value signal from a torque sensor of an electric tool by using a filter. The signal processing apparatus includes a half width detector circuit that detects a half width of the torque value signal; and a calculator circuit that controls a cut-off frequency of the filter to change the cut-off frequency according to a number of hits of the electric tool, based on the detected half width of the torque value signal.

A signal processing apparatus for an electric tool is provided for generating a motor control signal for controlling a motor by performing a smoothing process on a torque value signal from a torque sensor of an electric tool by using a filter. The signal processing apparatus includes a half width detector circuit that detects a half width of the torque value signal; and a calculator circuit that controls a cut-off frequency of the filter to change the cut-off frequency according to a number of hits of the electric tool, based on the detected half width of the torque value signal.

An impact tool includes a housing, an impact mechanism unit, a motor, and a dust collection fan. The housing is configured to mount a dust collection attachment. The impact mechanism unit is disposed inside the housing. The impact mechanism unit has a front end to which a tool bit is mounted and an impact element that reciprocates. The impact mechanism unit is configured to impact the tool bit by the impact element. The motor is disposed such that a rotation shaft of the motor intersects with an impact axis direction of the impact mechanism unit inside the housing. The dust collection fan is disposed on the rotation shaft. The dust collection fan is disposed below the motor.

A power tool includes: a motor; an output part configured to be rotated around a rotational axis in response to energization of the motor; a plurality of lights disposed spaced apart around the output part; and an optical member having a refractive surface that refracts, radially outward of (away from) the rotational axis, illumination light emitted from a light-emitting surface of one of the lights.

The disclosure relates to a switching device for a hammer drill, having a manually actuatable switching element. It is proposed that the switching element is designed for actuating an operational mode switching unit and a switching unit for changing the direction of rotation.