A chuck has a body (14). A plurality of first teeth (96) are rotationally fixed to the body. At least one second tooth (100) opposes the first teeth. The first teeth and the at least one second tooth are configured so that engagement of the first teeth and the at least one second tooth prevents relative rotation between a nut (16) and the body in an opening direction. A sleeve (18) defines a notch (90b) that engages a spring (29) so that in a relative rotational position between the sleeve and the nut, the notch receives the spring so that the notch resists relative rotational movement between the sleeve and the spring in the opening direction of the chuck.

A chuck assembly includes a chuck body rotatable about an axis, a plurality of jaws each received within a slot of the chuck body for co-rotation with the chuck body about the axis, a wedge engageable with an outer surface of each jaw, a pusher coupled to the plurality of jaws to bias the plurality of jaws in a forward direction into engagement with the wedge, and a tightening sleeve threadably coupled to the chuck body for relative rotation with the chuck body. The tightening sleeve includes a clamping surface engageable with the wedge for inwardly displacing the plurality of jaws in a radial direction, causing the plurality of jaws to secure a tool bit received within the chuck assembly, in response to rotation of the tightening sleeve relative to the chuck body in a tightening direction.

A chuck device includes a chuck main body, an exchange member, an axial direction regulating mechanism, and a circumferential direction regulating mechanism. The axial direction regulating mechanism has a circumferential groove section, which extends in the circumferential direction, that is recessed into one of the chuck main body and the exchange member and a radially protruding section, which is able to protrude in the radial direction, that is disposed in the other of the chuck main body and the exchange member. The circumferential direction regulating mechanism has an axially recessed section, which is recessed in the axial direction, that is disposed in one of the chuck main body and the exchange member and an axially protruding section, which is able to protrude in the axial direction, that is disposed in the other of the chuck main body and the exchange member.

A bit holder assembly for a rotary hand or powered tool, includes a body having a hex shank at its rearward end and a retraction collar slidably disposed on the body. The body has a coaxial hex socket formed therein to allow a tool bit to be inserted thereinto. A coil spring biases the retraction collar forwardly and biases a retaining clip toward the bottom of an angular slot formed in the body. The bit is removed by sliding the retraction collar rearwardly, to compress the coil spring and allow the retaining clip to retract back up the slot. A ring magnet is disposed at the forward end of the retraction collar to magnetize a fastener to retain the fastener to the bit.

A chuck includes a chuck body extending along a longitudinal axis, the chuck body including a plurality of slots each arranged at an oblique angle with respect to the longitudinal axis. A plurality of jaws each includes a first engagement portion, a jaw end, and a drive end. Each of the jaws is disposed within one of the plurality of slots and is movable between a close position and an open position. A biasing member is coupled to the plurality of jaws and is operable to bias the plurality of jaws toward the close position and a rotating assembly is selectively engageable with the plurality of jaws such that when engaged, the plurality of jaws are movable in response to rotation of the rotating assembly.

A locking mechanism for use with a tool has a tool having a first working end, an opposite second end, a central axis therebetween, and a least one axial recess formed on an outer surface of the tool. A cap is rotatably received on the tool opposite second end, the cap comprising at least one recess formed on an outer surface thereon. The cap is rotatable between a first position in which the cap at least one recess aligns with the tool at least one recess, and a second position in which the cap at least one recess is out of alignment with the tool at least one recess. The locking mechanism further comprises a detent operatively positioned between the tool and the cap. The detent may be a pin and a spring, where the spring biases the cap into the second position.

A method of operating a power tool chuck assembly includes inserting a tool bit within a central bore of a chuck body, displacing a plurality of jaws with the tool bit from an extended position to a retracted position, displacing the jaws from the retracted position toward the extended position with a spring, rotating a tightening sleeve about a rotational axis in a tightening direction, thereby imparting an axial displacement to the tightening sleeve relative to the chuck body, inwardly displacing a plurality of clamping nuts in a radial direction in response to engagement between a wedge defined on the tightening sleeve and the clamping nuts, causing respective threads on the clamping nuts and the jaws to engage, and applying a clamping force on the tool bit with the jaws in response to continued rotation of the tightening sleeve in the tightening direction.

A work holder includes: a first holding part having three attracting members that are arranged circumferentially apart from each other to attract an axial end face of an annular work; and a second holding part having a contacting member that is held in contact with an inner periphery or outer periphery of the work and restricts radial movement of the work.

A method of operating a power tool chuck assembly includes inserting a tool bit within a central bore of a chuck body, displacing a plurality of jaws with the tool bit from an extended position to a retracted position, displacing the jaws from the retracted position toward the extended position with a spring, rotating a tightening sleeve about a rotational axis in a tightening direction, thereby imparting an axial displacement to the tightening sleeve relative to the chuck body, inwardly displacing a plurality of clamping nuts in a radial direction in response to engagement between a wedge defined on the tightening sleeve and the clamping nuts, causing respective threads on the clamping nuts and the jaws to engage, and applying a clamping force on the tool bit with the jaws in response to continued rotation of the tightening sleeve in the tightening direction.

In a tool attachment for fastening to a fastening interface of a hand-held machine tool, having a locking unit which in an unlocked state makes it possible for the tool attachment to be placed on the fastening interface of the hand-held machine tool and in a locked state makes it possible for the tool attachment to be locked to the fastening interface of the hand-held machine tool for operation, the locking unit having a rotatable locking body, and a first rotational position of the locking body being associated with the unlocked state and a second rotational position of the locking body being associated with the locked state, the locking unit has a locking member which is configured to prevent rotation of the locking body from the second rotational position into the first rotational position in the locked state.