A hand-tight drill chuck with a lock and self-locking structure including an elastic piece with an arcuate portion, arranged on a ring member threadedly connected to a clamping claw. The two ends of the arcuate portion are restricted. The elastic piece has a locking portion and groove or protrusion that cooperate with teeth between two ends of the arcuate portion. The drill chuck has a rotation sleeve with control structure. The control structure includes a metal member with elastic portion having a protrusion or groove that cooperate with the groove or protrusion. When the groove or protrusion of the elastic piece withstands against and is engaged with the protrusion or groove of the metal member via elasticity, the drill chuck is in a self-locking state. This ensures a locking torque and unlocking torque by elastic match between an elastic force which is not slack.

A chuck mechanism operates a piston in a cylinder tube by using action of compressed air and opens and closes, by using a rod coupled to the piston, a pair of fingers, thereby gripping work W. The locking mechanism locks the fingers at work grip positions. The locking mechanism includes a first locking member, a second locking member, and a drive device. The first locking member is displaced when the pair of fingers are opened or closed. The second locking member retains the first locking member so as to lock the fingers at the work grip positions. The drive device relatively displaces the first locking member and the second locking member to locking positions and non-locking positions.

A workholding apparatus comprises a base having a channel, two lower members each having a protrusion, and two upper members each having a cavity. Each lower member is coupled with an actuator placed inside the channel. Each upper member is removably coupled with a lower member by inserting the protrusion inside the cavity. The protrusions and the cavities include triangular regions having tilted sides. The upper members releasably engage the lower members by inserting the protrusions into the cavities. The lower members are coupled with an actuator which operates to move the lower members toward one another causing the upper members to generate a clamping, force. A mounting apparatus comprises two lower members and a single upper member, having similar protrusions and cavities, provides a mounting platform.

A workholding apparatus comprises a base having a channel, two lower members each having a protrusion, and two upper members each having a cavity. Each lower member is coupled with an actuator placed inside the channel. Each upper member is removably coupled with a lower member by inserting the protrusion inside the cavity. The protrusions and the cavities include triangular regions having tilted sides. The upper members releasably engage the lower members by inserting the protrusions into the cavities. The lower members are coupled with an actuator which operates to move the lower members toward one another causing the upper members to generate a clamping, force. A mounting apparatus comprises two lower members and a single upper member, having similar protrusions and cavities, provides a mounting platform.

The invention relates to a chuck having a sleeve, a chuck body, a plurality of chuck jaws, an adjusting mechanism configured to adjust relative movement between the chuck jaws and the chuck body, at least one locating member and a pushing mechanism. The locating member is disposed on the chuck body between the adjacent chuck jaws. When the adjusting mechanism drives the chuck jaws to approach to each other relative to the longitudinal axis, the pushing mechanism pushes the locating member to move towards the longitudinal axis. When the adjusting mechanism drives the chuck jaws to move away from each other relative to the longitudinal axis, the pushing mechanism pushes the locating member to move away from the longitudinal axis. Therefore, the operation is more convenient and safer; the aligning effect is precise and reliable, and the pre-tightening force is stable.

The invention relates to a chuck having a sleeve, a chuck body, a plurality of chuck jaws, an adjusting mechanism configured to adjust relative movement between the chuck jaws and the chuck body, at least one locating member and a pushing mechanism. The locating member is disposed on the chuck body between the adjacent chuck jaws. When the adjusting mechanism drives the chuck jaws to approach to each other relative to the longitudinal axis, the pushing mechanism pushes the locating member to move towards the longitudinal axis. When the adjusting mechanism drives the chuck jaws to move away from each other relative to the longitudinal axis, the pushing mechanism pushes the locating member to move away from the longitudinal axis. Therefore, the operation is more convenient and safer; the aligning effect is precise and reliable, and the pre-tightening force is stable.

A spindle unit for machine tools that includes a working spindle rotationally bearing-mounted in axially spaced spindle bearings in a spindle case, and an electric driving motor. The working spindle includes at its head side a clamping device for a tool and at its rear side a non-rotating ring cylinder for activating said clamping device via a rotating tie rod, and rotational bushing for supplying said tool with cooling and/or lubricating agents through a hydraulic conduit extending longitudinally through said working spindle. At least a segment of the non-rotating ring cylinder may be received in the rear end portion of said working spindle.

A chuck (10) has a body (14), a plurality of jaws (22), and a rotatable nut (16). A sleeve (18) is rotatable between a first rotational position and a second rotational position with respect to the nut. An annular array of first teeth (84) are non-rotatable with respect to the body. One or more second teeth (63) are non-rotatable with respect to the nut and axially movable with respect to the body. When the teeth engage, they resist the nut's rotation in the opening direction. An engagement between the sleeve and the one or more second teeth moves the one or more second teeth out of engagement with the first teeth when the sleeve moves from the second rotational position to the first rotational position and moves the one or more second teeth into engagement with the first teeth when the sleeve moves from the first rotational position to the second rotational position.

A chuck including a chuck body that supports a plurality of jaws. An outer sleeve is axially fixed with respect to the chuck body. A nut is coupled to the outer sleeve, and the nut is movable axially and radially relative to the chuck body. The nut interacts with the jaws such that when the outer sleeve rotates, the nut moves axially and radially relative to the body.

A power tool chuck includes a body with a central bore extending along an axis and configured to receive a tool bit, a plurality of angled passageways, and a plurality of jaws received in the passageways and moveable between an axially forward and radially inward clamping position and an axially rearward and radially outward retracted position. At least one jaw has a rear end lying in a first plane transverse to the axis. A first key drive member coupled to a tail portion of the body is configured to be engaged by a second key drive member on a power tool output shaft to non-rotationally couple the body to the output shaft. The first key drive has a forward end lying in a second plane transverse to the axis. The second plane is axially forward of the first plane when the jaws are in the retracted position.