Patent ID: 8540225

Claim:
A master jaw assembly used in a vise, comprising: (a) a locking jaw having a groove extending along an inner side surface of the locking jaw, said groove having a base defined by first and second opposed edges where the first edge is normal to the base and the second edge is tapered inward and downward toward the base and with at least one aperture formed inward from a top surface of the locking jaw and intersecting the first edge of the locking jaw; (b) a detachable jaw having a dovetail protrusion along one side surface thereof of substantially the same width as the groove in the locking jaw; (c) a clamping means disposed in the locking jaw along the first edge for securely coupling the detachable jaw to the locking jaw wherein the clamping means comprises at least one tapped hole vertically disposed in the base of the locking jaw; (d) at least one clamp-nut having a threaded bore running longitudinally through a body of the clamp-nut and an inwardly and downwardly tapered edge in a bottom portion of the clamp-nut and wherein said aperture in the locking jaw is sized and shaped to receive and encircle the clamp-nut therein; and (e) at least one double-end stud having a right-hand threaded segment for screwing into the tapped hole in the clamping means and a left-hand threaded segment on the second end for screwing into the threaded bore in the clamp-nut such that when the double-end stud is rotated clockwise, the first end of the double-end stud screws into the tapped hole in the clamping means and draws the clamp-nut downward through the aperture and thereby clamps the dovetail protrusion of the detachable jaw between the second edge of the locking jaw and the tapered edge in the bottom portion of the clamp-nut.