Disclosed is a socket unit comprising a first body portion comprising a first rear end portion for connection to the output shaft of a power tool and a front end portion adapted for engagement with a screw joint and a second body portion comprising a second rear end portion for connection to the output shaft of the direct driven power tool or a second front end portion adapted for engagement with a screw joint. The second body portion is at least partly arranged in the first body portion, and a relative rotation between the first and second body portions is allowed, such that one of the first and second body portions may rotate over a predetermined allowable angular range when the other is in engagement with the screw joint. The present specification also relates to a corresponding method, power tool and computer readable storage medium.

Disclosed is a socket unit comprising a first body portion comprising a first rear end portion for connection to the output shaft of a power tool and a front end portion adapted for engagement with a screw joint and a second body portion comprising a second rear end portion for connection to the output shaft of the direct driven power tool or a second front end portion adapted for engagement with a screw joint. The second body portion is at least partly arranged in the first body portion, and a relative rotation between the first and second body portions is allowed, such that one of the first and second body portions may rotate over a predetermined allowable angular range when the other is in engagement with the screw joint. The present specification also relates to a corresponding method, power tool and computer readable storage medium.

An impact rotary tool includes a hammer and an anvil that transmits rotational impact force from the hammer to a tip tool. The anvil includes a first member and a second member. The first member holds the tip tool thereon. The first member is fitted into the second member. The rotational impact force is applied to the second member. The first member and the second member are arranged to be fitted into each other in a fitting portion. The fitting portion has a tolerating mechanism. The tolerating mechanism tolerates misalignment of a first rotational axis with a second rotational axis. The first rotational axis is a rotational axis of the first member. The second rotational axis is a rotational axis of the second member.

An impact rotary tool includes a hammer and an anvil that transmits rotational impact force from the hammer to a tip tool. The anvil includes a first member and a second member. The first member holds the tip tool thereon. The first member is fitted into the second member. The rotational impact force is applied to the second member. The first member and the second member are arranged to be fitted into each other in a fitting portion. The fitting portion has a tolerating mechanism. The tolerating mechanism tolerates misalignment of a first rotational axis with a second rotational axis. The first rotational axis is a rotational axis of the first member. The second rotational axis is a rotational axis of the second member.

A technique reduces an increase in the size of an impact tool. An impact tool includes a motor, a striker drivable by the motor, an anvil including an anvil shaft to receive a tip tool, and an anvil projection protruding radially outward from a rear end of the anvil shaft to be struck by the striker in a rotation direction, a hammer case accommodating the striker, a bearing held in the hammer case and surrounding the anvil shaft, a ring member at least partially facing a front surface of the anvil projection and in contact with a rear end face of the bearing, and a stopper engaging with the hammer case and the ring member to reduce moving of the ring member rearward.

A technique reduces an increase in the size of an impact tool. An impact tool includes a motor, a striker drivable by the motor, an anvil including an anvil shaft to receive a tip tool, and an anvil projection protruding radially outward from a rear end of the anvil shaft to be struck by the striker in a rotation direction, a hammer case accommodating the striker, a bearing held in the hammer case and surrounding the anvil shaft, a ring member at least partially facing a front surface of the anvil projection and in contact with a rear end face of the bearing, and a stopper engaging with the hammer case and the ring member to reduce moving of the ring member rearward.

A socket-shaft connection assembly for motorsport pneumatic impact wrench includes a socket-holding shaft, a socket, a fixing element for connecting the socket to the socket-holding shaft along an axis of the socket-holding shaft, wherein: the socket-holding shaft and the socket include respective grooved profiles cooperating for the torque transmission between the socket-holding shaft and the socket; the fixing element is conformed to exert a force in the direction of the axis of the socket-holding shaft to connect the socket to the socket-holding shaft; on the fixing element, on the socket-holding shaft and on the socket a plurality of coupling conical surfaces are obtained for centering said socket on said socket-holding shaft, wherein the coupling conical surfaces are distinct from the grooved profiles.

A socket-shaft connection assembly for motorsport pneumatic impact wrench includes a socket-holding shaft, a socket, a fixing element for connecting the socket to the socket-holding shaft along an axis of the socket-holding shaft, wherein: the socket-holding shaft and the socket include respective grooved profiles cooperating for the torque transmission between the socket-holding shaft and the socket; the fixing element is conformed to exert a force in the direction of the axis of the socket-holding shaft to connect the socket to the socket-holding shaft; on the fixing element, on the socket-holding shaft and on the socket a plurality of coupling conical surfaces are obtained for centering said socket on said socket-holding shaft, wherein the coupling conical surfaces are distinct from the grooved profiles.

A percussion mechanism device, in particular for an impact wrench, includes a drivable drive shaft that has at least one guide groove, an output shaft, and a percussion unit that includes an anvil coupled with the output shaft in a rotationally fixed manner, a hammer, and at least one ball. The hammer is supported via the at least one ball along the at least one guide groove on the drive shaft and includes an at least regionally concavely curved ball guidance area that has an axial clearance from the at least one ball at a radially innermost point that is greater than a radial clearance between the at least one ball and a radially innermost point of a concave ball guidance area of the at least one guide groove.

In order to provide an impact work machine capable of preventing oil leakage and cooling a power transmission apparatus, an impact work machine transmitting power of an electric motor 16 including an output shaft extending in an axis A1 direction to an anvil includes: a housing including a motor case accommodating the electric motor, and a grip extending from the motor case; a speed reducer and an impact mechanism 96 each transmitting power of the electric motor to the anvil; a hammer case located forward of the motor case and nonrotatable relative to the motor case; an extension portion provided on the housing and extending from the motor case toward the hammer case so as to cover at least part of the hammer case; and a passage provided between the hammer case and the extension portion and through which air passes.