A chuck for gripping a workpiece includes: a chuck body; a jaw connected to the chuck body for constrained movement relative to the chuck body along a jaw path in jaw-closing and jaw-opening directions; an actuator body connected to the chuck body for constrained movement relative to the chuck body along an actuator path; and a slider body connected to the chuck body for constrained movement relative to the chuck body along a slider body path. The slider body is connected to the jaw for constrained movement relative to the jaw along a slider-body-to-jaw path. The slider body is connected to the actuator body for constrained movement relative to the actuator body along a slider-body-to-actuator-body path.

A chuck-claw coupling mechanism includes a coupling member provided in a master jaw, a first resilient member, and an operation unit. The coupling member is movable between a coupling position at which the coupling member is coupled to the claw, and a separation position at which the coupling member is separated from the claw. The first resilient member urges the coupling member toward the coupling position. The operation unit moves the coupling member to the separation position.

There is disclosed a chuck jaw (10.1, 10.2, 10.3) for securing a workpiece (12) to a lathe chuck. The chuck jaw (10.1, 10.2, 10.3) includes a jaw body (16) adapted for operative mounting to the lathe chuck. The chuck jaw (10.1, 10.2, 10.3) further includes at least one holding element (18) operatively associated with the jaw body (16) and adapted to engage the workpiece (12). The at least one holding element (18) is moveable between (i) a release condition in which the holding element (18) is released from the workpiece (12), and (ii) an engaged position in which the holding element (18) engages a surface of the workpiece. The chuck jaw (10.1, 10.2, 10.3) further includes a clamping assembly (20) operatively adapted to secure the at least one holding element (18) in the engaged position.

A securement device for a press tool including an angular exterior body having a side wall. A multitude of ratcheting bodies are located around a top edge of the exterior body. The ratchets include a ratchet bar. The ratchet bar has a plurality of ratchet grooves that allow the ratchet bars to be slide inward toward the interior of the exterior body and to be locked into place. An interior body is located within the exterior body such that it can be moved about and provide extra support for the ratchets.

A chuck-claw coupling mechanism includes a coupling member provided in a master jaw, a first resilient member, and an operation unit. The coupling member is movable between a coupling position at which the coupling member is coupled to the claw, and a separation position at which the coupling member is separated from the claw. The first resilient member urges the coupling member toward the coupling position. The operation unit moves the coupling member to the separation position.

A structure, including first and second portions respectively having a serration in which peaks and valleys are continuous, and configured to adjust relative positions of the first and second portions in an adjustment direction by interlocking the peaks and valleys with each other. The adjustment direction is a direction in which the peaks and valleys of the serration are continuous; a fixing portion configured to maintain a defined state. The defined state is a state in which the peaks and valleys are interlocked with each other and the relative positions of the first and second portions are fixed; and a positioning mechanism provided on the second portion or the fixing portion, and having a contact portion configured to contact the first portion in the defined state.

A securement device for a press tool including an angular exterior body having a side wall. A multitude of ratcheting bodies are located around a top edge of the exterior body. The ratchets include a ratchet bar. The ratchet bar has a plurality of ratchet grooves that allow the ratchet bars to be slide inward toward the interior of the exterior body and to be locked into place. An interior body is located within the exterior body such that it can be moved about and provide extra support for the ratchets.

A structure that is mounted to industrial equipment. This structure includes a jig, a first fixing member and a second fixing member, and a grip part. The industrial equipment has an attachment/detachment region for attaching and detaching the jig. The attachment/detachment region has a first space. The jig has a second space. The first fixing member is accomodatable in the first space. The second fixing member is accomodatable in the second space. The second fixing member is configured so that the jig can be attached to and detached from the attachment/detachment region by adjusting the degree of helical engagement of the first and second fixing members. The grip part is provided to at least one of the first fixing member and the second fixing member, and is configured grippable such that, in a state in which the degree of helical engagement has been loosened, the structure can smoothly be moved.

A projecting part 11A and a recessed part 12A which engage with each other are formed on a master jaw 11 and a top jaw 12. In the master jaw 11, a movable pin 20 movable in an axial direction and a shaft 30 movable in a radial direction is disposed, and the movable pin 20 is engaged with the shaft so that the movable pin 20 can be moved in the axial direction. The top jaw 12 is provided with a pin hole 12c into which the movable pin 20 can be inserted. The movable pin 20 is locked, by rotating the shaft 30 by a predetermined amount, at a first position in which the movable pin 20 is inserted in the pin hole 12c or at the second position in which the movable pin 20 is extracted from the pin hole 12c.

Intrusion of chips is prevent into gaps formed between inner end surfaces of master jaws and a chuck cover. A top plate is disposed at the center of an end surface of a chuck body. Top covers, which move in conjunction with movements of master jaws when opening and closing the chuck, are disposed in top cover guide recesses formed at three positions on the top plate. Each top cover abuts the center-side end parts of serrated surfaces formed on both widthwise sides of a respective master jaw and the center-side end part of a step section of a stepped claw therebetween, and the top covers close gaps formed at the center-side end parts by the movements of the master jaws at all times by moving in conjunction with movement of the master jaws.