A multipurpose chuck having provisions for gripping the outer diameter of workpieces; alternatively, the inner diameter of workpieces; alternatively gripping parts by a two vise jaw, or in combination with a magnet attraction. The chuck having six radially movable jaws that can be used in combination, or by itself with vise grip jaws, which can be used in combination or by itself with a magnetic workpiece attachment in a single chuck.

A chuck for gripping and moving cylindrical bodies, in particular fittings and pipe segments, including a main body defining an axis of rotation and a plurality of jaws fastened to the main body; the jaws are movable between a position of maximum closure, in which they are at the minimum distance from the axis of rotation, to a position of maximum opening, in which they are at the maximum distance from the axis of rotation; the chuck has an adjuster means for adjusting the positions of maximum closure and maximum opening and a movement means for moving the jaws between the positions of maximum closure and maximum opening; the chuck includes a fixing means adapted to allow the axial fixing of the chuck to a support member and the connection of the chuck to the support member so that they are angularly rotatable with respect to each other.

A wheel rim chuck has a chuck seat (10) and multiple soft jaws (20). The soft jaws are arranged radially at equiangular intervals and slidably mounted on the chuck seat (10). Each soft jaw (20) has a claw (21) having a protrusion (211), a clamping groove (213), and an inclined plane (216). The protrusion (211) protrudes from a side of the soft jaw (20) away from the chuck seat (10). The clamping groove (213) is recessed in a side of the protrusion (211) facing the center (111) of the chuck seat (10) and having a side wall (214) and a bottom wall (215). The inclined plane (216) extends longitudinally and obliquely from the bottom wall (215) away from the side wall (214) of the clamping groove (213).

An attachment apparatus for laser engraving comprising a chuck housing comprising a plurality of channels; a plurality of self-centering jaws bases disposed within the plurality of channels, the plurality of self-centering jaws bases further comprising at least one jaws base hole; and a scroll wheel in mechanical communication with the plurality of self-centering jaws bases.

To prevent a lowering of gripping force due to temperature changes, provided is a gripping mechanism including a plurality of chuck claws that, when having come close to each other, generate a gripping force on a gripped body; a chuck body that holds the plurality of chuck claws on a common planar surface, and moves them on the planar surface; and a plurality of chuck plates that, when each of the plurality of chuck claws grips the gripped body, are interposed between each of the plurality of chuck claws and the gripped body. A thermal expansion coefficient .sub.1 of the plurality of chuck claws, a thermal expansion coefficient .sub.2 of the plurality of chuck plates and a thermal expansion coefficient .sub.W of the gripped body have a relationship indicated by
.sub.W<.sub.1<.sub.2(Equation 1).

A multipurpose chuck having provisions for gripping the outer diameter of workpieces; alternatively, the inner diameter of workpieces; alternatively gripping parts by a two vise jaw, or in combination with a magnet attraction. The chuck having six radially movable jaws that can be used in combination, or by itself with vise grip jaws, which can be used in combination or by itself with a magnetic workpiece attachment in a single chuck.

An attachment apparatus for laser engraving comprising a chuck housing comprising a plurality of channels; a plurality of self-centering jaws bases disposed within the plurality of channels, the plurality of self-centering jaws bases further comprising at least one jaws base hole; and a scroll wheel in mechanical communication with the plurality of self-centering jaws bases.

A gripping mechanism includes: a plurality of chuck claws that, when having come close to each other, generate a gripping force on a gripped body; a chuck body that holds the plurality of chuck claws on a common planar surface, and moves them on the planar surface; and a plurality of chuck plates that, when each of the plurality of chuck claws grips the gripped body, are interposed between each of the plurality of chuck claws and the gripped body, wherein a thermal expansion coefficient .sub.l of the plurality of chuck claws, a thermal expansion coefficient .sub.2 of the plurality of chuck plates and a thermal expansion coefficient .sub.W of the gripped body has a relationship indicated by Equation 1:

.sub.W<.sub.1<.sub.2 (Equation 1)

An attachment apparatus for laser engraving comprising a chuck housing comprising a plurality of channels; a plurality of self-centering jaws bases disposed within the plurality of channels, the plurality of self-centering jaws bases further comprising at least one jaws base hole; and a scroll wheel in mechanical communication with the plurality of self-centering jaws bases.

A chuck for gripping and moving cylindrical bodies, in particular fittings and pipe segments, including a main body defining an axis of rotation and a plurality of jaws fastened to the main body. The jaws are movable between a position of maximum closure, in which they are at the minimum distance from the axis of rotation, to a position of maximum opening, in which they are at the maximum distance from the axis of rotation. The chuck can adjust the positions of maximum closure and maximum opening and can move the jaws between the positions of maximum closure and maximum opening. The chuck also allows for the axial fixing of the chuck to a support member and for a connection of the chuck to the support member so that they are angularly rotatable with respect to each other.