A chuck for driving bolts into holes with rotation consists of an outer tubular casing and resiliently mounted jaws therein, such that on turning the casing in one sense the jaws grip and turn any bolt which they surround.

A chuck comprises a body (10) rotatable about an axis (11) and at least one jaw (12) movable in a radial direction to clamp a workpiece in the chuck. At least one operating lever (14) is mounted on the body (10) and the, or each, lever is operable to move a jaw (12) radially. The, or each, lever is also movable axially with respect to the chuck body (10), to disengage from the associated jaw (12), enabling the associated jaw (12) to be removed simply and quickly from the chuck body (10) by movem...

A fluid-operated ram, for example comprising a cylinder 10 and piston 12, is provided for actuating a device such as a chuck having jaws 15. When the jaws are moved by the ram to grip a workpiece this constitutes a limiting position which impedes the flow of fluid thus causing a build-up of fluid pressure within the ram. This build-up can be detected to give an indication as to when a workpiece has been securely and safely gripped. To ensure that a false indication is not given if the ram reache...

A chuck for holding a tool comprises a chuck support having a conical recess which accepts a conical clamping sleeve. A clamping nut carrying a freely rotatable ring is threaded onto the chuck support. The ring has means for engaging the chuck support in such a way to permit relative axial movement therebetween but no relative rotational movement. Shoulders on the clamping sleeve and the ring are so arranged that in one relative position axial movement therebetween is blocked while in another re...

A drill chuck having converging slidable jaws which are extendible and retractible relative to the body of the chuck by means of a key operable bevel gear part and an associated nut rotatable relative to the body, together with a driving component for the chuck for detachably mounting the chuck to the spindle of a power tool, and further provided with means for producing a self-centering action between the body part and the driving component. Various modifications of the components of the chuck,...

There is disclosed in the present application a core chuck comprising a relatively rigid and non-deformable multi-lobar actuator loosely surrounded by an elastomeric sleeve which in its free state is non-circular in cross-section and circumferentially contractible to accommodate to the interior of a paper roll core which is of a diameter smaller than the dimension of the sleeve in its free state.

There is disclosed in the present specification a core chuck including a deformable outer sleeve of elastomer or equivalent material and a multi-lobar generally rigid internal actuator for expanding the sleeve as a result of relative angular motion in either direction between the sleeve and the actuator from their at-rest positions. The sleeve is non-cylindrical having a plurality of core engaging ridges and is compressible for initial insertion into the core.

A chuck which includes a tool holding unit and a body having means whereby it can be driven by a driving element and can telescope realtive thereto and having means for transmitting drives to the tool holding unit, characterised in that : A. the driving element is a shank which has a sliding key connection within the body and that the shank telescopes relative to the body under the action of biasing means housed entirely within an axial bore in the shank and B. the means for transmitting drives ...

A drill chuck having a body part and a cylindrical sleeve connected to the usual nut member engaging the jaws, the cylindrical sleeve extending rearwardly to engage a cylindrical portion of the body remote from the nut member.

An electrostatic chuck 12 for a plasma reactor apparatus 10 comprises a base metallic section 23, a pair of electrodes 24 set in bonding material 27 and electrically insulated from the base by a plate 29 and a thick dielectric layer 20 (e.g. 0.5 to 1.5 mm), which covers the electrodes 24 and bonding material 27 and forms the support surfaces for wafers 31.