A square tool holder (10) for an impact wrench is provided, including an anvil (1), on which a drive square (2) is situated for accommodating a tool, in particular an impact wrench socket, and including a safety bolt (3) for securing the accommodated tool, the safety bolt (3) being spring-mounted in the drive square (2) in such a way that the safety bolt is movable perpendicularly to the axis of rotation (D) of the anvil (1), the safety bolt (3) having a rounded, preferably hemispherical surface (3), which protrudes from a holding surface (2) of the drive square (2) in a state of spring-extension (AZ) of the safety bolt (3) and is at least partially countersunk in the holding surface (2) in a state of spring-compression of the safety bolt (3), the safety bolt (3) being secured against falling out by at least one safety pin (4, 4) situated in the drive square (2).

A power tool including a motor and a pulse unit intermittently driving an output shaft, wherein the pulse unit includes a cylinder with an inner cavity arranged to withhold a hydraulic fluid, and an anvil located inside the inner cavity, the anvil being connected to the output shaft, wherein: at least one recess is arranged inside the inner cavity wherein at least one magnet is provided inside the recess; and the at least one recess is deeper than the at least one magnet such that a pocket is formed in the recess outside the magnet.

A drilling tool configured to operate in two drilling modes, respectively with and without hammer action, said tool comprising a front end equipped with a rotating part for mounting a drill bit by way of an SDS-type push-fitting, characterized in that said rotating part comprises mechanism for the removable attachment to a first longitudinal end of a tubular extension, this tubular extension being configured to extend along and around a drill bit mounted in the rotating part and comprising a second longitudinal end configured to bear at least one screw-driving element, such that the tool can be used for a screw-driving operation even when it is equipped with the drill bit.

A power tool, such as a hammer driver-drill (1), includes a spindle (26) that is axially and rotatable supported inside a metal gear case (41). A first cam (83) is affixed to the spindle so as to rotate therewith and is housed in the gear case (41). A second cam (84) is disposed around spindle such that it is rotatable separately with respect to the spindle and can be brought into contact with the first cam. Hammer-switching levers (95) are movable relative to the gear case between an advanced position, at which rotation of the second cam is restricted (blocked), and a retracted position, at which the rotational restriction on the second cam is released. Receiving members (89) are respectively interposed between the gear case and the hammer-switching levers and are configured to absorb vibration generated when a hammering operation is being performed using the power tool.

An impact tool includes a housing, an electric motor supported within the housing and having a motor shaft, and a drive assembly configured to convert a continuous rotational input from the motor shaft to consecutive rotational impacts upon a workpiece. The drive assembly includes a camshaft having front and rear portions. A gear assembly is coupled between the motor shaft and the drive assembly, the gear assembly including a ring gear that is rotationally and radially fixed relative to the housing and a plurality of planet gears meshed with the ring gear. Each of the plurality of planet gears is coupled to the rear portion of the camshaft, and a line of action of a radial load exerted by the rear portion of the camshaft on the housing passes through one of the plurality of planet gears and the ring gear.

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.

The durability of a reduction mechanism is improved. An impact wrench includes a brushless motor, a sun gear rotatable by the brushless motor, a planetary gear meshing with the sun gear, an internal gear meshing with the planetary gear and having a first recess on an outer circumference, a gear case holding the internal gear and having a second recess on an inner circumference, a spindle holding the planetary gear, and a pin disposed in the first recess and in the second recess.

An electric tool to restrain stress concentration is provided. The electric tool includes a housing (7, 8), a motor (2), an anvil (5, 105), and an impact mechanism (4). The motor is accommodated in the housing and rotatable. The anvil supported by the housing and rotatable about an axis (A). The impact mechanism is configured to convert a rotational force generated by the motor into a rotational impact force about the axis, and to apply the rotational impact force to the anvil. The anvil includes a base portion (51), an end bit attachment portion (80, 180), and a connecting portion (90, 190). The base portion is rotatably supported by the housing. An end bit is attachable to the end bit attachment portion. The end bit attachment portion has a flat surface portion. The connecting portion integrally connects together the base portion and the end bit attachment portion. The connecting portion has a diameter gradually reduced in a direction from the base portion toward the end bit attachment portion. The connecting portion is formed with a recessed portion (93, 94, 193A, 193B, 194). The connecting portion has an outer peripheral surface portion where the recessed portion is formed. The recessed portion is recessed, in an axial direction from the end bit attachment portion toward the base portion, from a point where the recessed portion is connected to the outer peripheral surface portion in a cross-section taken along a plane parallel to the flat surface portion and passing through the recessed portion.

A rotary impact tool includes a housing, an electric motor, and a drive assembly for converting a continuous torque input from the motor to consecutive rotational impacts upon a workpiece of at least 900 ft-lbs of fastening torque. An anvil has a bore defining a hexagonal cross-sectional shape and having a nominal width of 7/16 inches. A hammer is rotationally and axially movable relative to the anvil for imparting the consecutive rotational impacts upon the anvil. A spring biases the hammer in an axial direction toward the anvil. A battery pack has a nominal voltage of at least 18 Volts and a nominal capacity of at least 5 Ah. The rotary impact tool has an overall weight including the battery pack that is less than or equal to 7.5 pounds. A ratio of the fastening torque to the overall weight is greater than or equal to 120 ft-lbs per pound.

A one-way inertial rotational device includes: a rotary seat; an inertial member pivotally rotatably disposed on the circumference of the rotary seat via a pivot hole, a circumference of the rotary seat and a hole wall of the pivot hole of the inertial member being defined as a first circumferential face and a second circumferential face; and a one-way transmission mechanism having at least one one-way transmission tooth, at least one elastic member and multiple engagement teeth. The engagement teeth are annularly disposed on the second circumferential face. The transmission tooth is displaceably disposed on the first circumferential face. The elastic member keeps the transmission tooth engaged with the engagement teeth. Each engagement tooth has a tooth crest and a tooth height. The width of the tooth crest is larger than the tooth height so that the loss of the rotational energy is reduced to achieve greater rotational torque.