An impact tool includes a motor, a hammer, and an anvil. The hammer is configured to be rotated around a rotation axis by motive power provided from the motor. The anvil is configured to be rotated around the rotation axis by receiving striking force from the hammer in a circumferential direction of the rotation axis. In the impact tool, moment of inertia of the hammer around the rotation axis is 10 or more times moment of inertia of the anvil around the rotation axis.

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 power tool allows mode switching and clutch operation torque switching using a single ring. An electric vibration driver drill includes an internal gear that meshes with planetary gears, an internal gear lock pin that moves forward relative to the internal gear to lock the internal gear, a first vibration cam fixed to a spindle, a second vibration cam that rubs against the first vibration cam and rotate relative to a gear housing, a vibration switch lever that moves forward relative to the second vibration cam to lock the second vibration cam in a nonrotatable manner, and an annular change ring that switches between forward movement and rearward movement of the internal gear lock pins and switches between forward movement and rearward movement of the vibration switch lever.

A power tool including a motor and an impact mechanism. The impact mechanism is coupled to the motor and includes a hammer driven by the motor, and an anvil positioned at a nose of the power tool, and configured to receive an impact from the hammer. The power tool also includes a sensor assembly positioned at the nose of the power tool, and an electronic processor. The sensor assembly includes an output position sensor configured to generate an output signal indicative of a position of the hammer or the anvil. The electronic processor is coupled to the output position sensor and to the motor, and is configured to operate the motor based on the output signal from the output position sensor.

An impact tool includes a housing extending along a longitudinal axis, the housing including a motor housing portion and a front housing coupled to the motor housing portion, a motor supported within the motor housing portion, and a drive assembly supported within the housing. The drive assembly includes a camshaft driven by the motor for rotation about an axis, an anvil extending from the front housing, and a hammer configured to reciprocate along a travel portion of the camshaft between a rearmost position and a forwardmost position to deliver rotational impacts to the anvil in response to rotation of the camshaft. An axial distance between the forwardmost position and the rearmost position of the hammer is at least 20.75 millimeters, and the travel portion of the camshaft has a diameter of at least 25 millimeters.

An impact tool includes a housing including a motor housing portion and a front housing coupled to the motor housing portion, a motor supported within the motor housing portion, a battery pack supported by the housing for providing power to the motor, and a drive assembly supported within the housing and configured to convert continuous torque from the motor to consecutive rotational impacts upon a workpiece capable of developing at least 1,700 ft-lbs of fastening torque. The drive assembly includes a camshaft driven by the motor for rotation about an axis, an anvil extending from the front housing, and a hammer configured to reciprocate along a travel portion of the camshaft between a rearmost position and a forwardmost position to deliver rotational impacts to the anvil in response to rotation of the camshaft.

A power tool including a motor and an impact mechanism. The impact mechanism is coupled to the motor and includes a hammer driven by the motor, and an anvil positioned at a nose of the power tool, and configured to receive an impact from the hammer. The power tool also includes a sensor assembly positioned at the nose of the power tool, and an electronic processor. The sensor assembly includes an output position sensor configured to generate an output signal indicative of a position of the hammer or the anvil. The electronic processor is coupled to the output position sensor and to the motor, and is configured to operate the motor based on the output signal from the output position sensor.

An impact tool includes a housing, a motor supported within the housing, an anvil extending from the housing, and a drive assembly configured to convert a continuous rotational input from the motor to intermittent applications of torque to the anvil. The anvil includes a body rotatable about a longitudinal axis, a driving end portion configured to receive a tool element over a distal end thereof, and a bore extending through the driving end portion of the anvil in a direction transverse to the longitudinal axis. The driving end portion includes a groove located between the bore and the distal end. The groove includes a curved portion converging toward the distal end and is configured to receive a friction ring such that the friction ring follows a contour of the groove.

A high-torque impact wrench is disclosed. The impact wrench comprises a case. The case comprises an engine body and a handhold. A base is provided on the bottom of the handhold. A battery pack is provided inside the base. The rear end of the engine body is configured with a motor, and the front end of the engine body is configured with an output shaft. The front end of the output shaft extends out of the engine body. A spindle is configured between the motor and the output shaft. The rear end of the spindle is provided with a spindle seat. The spindle is sheathed by an impact block. The spindle outer wall is configured with a steel ball track. Inside the steel ball track, there are steel balls matching the impact block.

An impact tool (1) includes: a motor (10); an impact mechanism (15), which is rotatable about an output rotational axis (BX) and is driven by the motor; an anvil (16) having an anvil shaft (113) disposed forward of the impact mechanism; and at least one anvil projection (114) protruding radially outward from a rear-end portion of the anvil shaft and configured to be impacted by the impact mechanism in a rotational direction; a hammer case (6) housing the impact mechanism; a main-body housing (2) disposed rearward of, and fixed to, the hammer case; a grip housing (3) having at least a portion disposed rearward of the main-body housing, the grip housing being coupled to the main-body housing so as to be movable relative to the main-body housing; and at least one vibration-isolating member (138, 139) disposed between the main-body housing and the grip housing.