US 4,431,202 AGranted

Pivoted jaw members

AssigneeJ & S Tool Company, Inc.

InventorHenry F. Swenson

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Abstract

This invention pertains to an auxiliary jaw which is adapted to be affixed to a movable member and as this movable member is advanced to and from a workpiece to grip and hold this workpiece when and while the auxiliary jaw is advanced. This auxiliary jaw includes a pivoted jaw member carried by a support member which is preferably secured to the movable member by cap screws. The pivoted jaw member engages the surface portion of the workpiece in local areas as it exerts a gripping force urges the workpiece toward the support surface. Three configurations of jaw assemblies are shown. Each has a pivoted jaw with one configuration supporting the workpiece above the pivoted jaw. In a second configuration the support as a pin means is below the pivoted jaw and in yet a third configuration the pivoted jaws are movable toward and to a support disk for multiple workpieces. Soft jaws, hardened jaws and bias means may be used to bring the pivoted jaw to the desired condition. A cap screw retains the pivoted jaw to the support member and the pivot is at and on the upper extent of the support. This auxiliary jaw may be attached to any work table but is usually used with a chuck body on a lathe. The movable member is conventionally a T-member slidable in a T-slot in the chuck body. This auxiliary jaw may be used with independent jaws or self-centering jaws moved by a scroll plate.

An auxiliary jaw adapted to be affixed to a reciprocably movable member and providing mounting means for said jaw which is advanced toward and from a workpiece to grip said workpiece and as this jaw is advanced provides a gripping action combined with a hold-down actuation, this auxiliary jaw arranged to act with an opposed abutting member to grip the workpiece, the auxiliary jaw carried by said movable member in a chuck, worktable and the like, this auxiliary jaw including:

(a) a support member provided with securing means by which said support member is fastened at its bottom surface to the reciprocably movable member and including a positioning means formed in both support member and the movable member;
(b) at least one receiving and retaining means formed in an upper portion of the support member including a fixed lip portion provided with a shoulder generally parallel to the bottom surface of the support member and with at least one guide portion disposed below the lip portion and adjacent thereto;
(c) a pivoted jaw member having a face portion adapted to engage a surface portion of a workpiece, said jaw carried by retaining means formed in and provided by the support member and guided by said guide portion to move in a plane generally parallel to the bottom surface of the support member, this jaw member having a pivot configuration which includes at least one portion adapted to slidably engage a compatibly formed portion on the support member to provide said guide portion, the jaw member having a recess formed by transverse surfaces at the corner adjacent the support member lip and positioned to receive the lip portion on the support so that in operating condition the lip and jaw member engage each other to provide actuation while the recess and the shoulder are engaged to prevent upward displacement of the jaw member as it is mounted and used with the support member, and
(d) securing means retained in the support member and engaging the jaw so as to hold the jaw member with limited movement relative to said support member at a selected position while permitting the pivoted movement of the lower end of the jaw member toward the support member, the fulcrum of the pivoted movement of the assembled auxiliary jaw being provided at the lip of the support member so that the lower jaw member portion has a determined clearance from the adjacent support member surface and may be pivoted around the fulcrum at said lip to provide the desired hold-down actuation.

1 more element

Abstract

Claims21