Abstract: A mechanical power amplifier for a vise having housing means and a primary member and a secondary member mounted therein. At least the primary member is movable in the housing and transmits a force to force amplifying and transmitting structure also mounted in the housing to effect both an amplification of the force transmitted thereto as well as a transfer of the force from the primary member to a force transmitting member. The force amplifying and transmitting structure includes a pair of bell-crank levers arranged in a mirror-image manner relative to the center axis of the housing. Each bell-crank lever has a long lever arm with a wedge surface thereon and a short lever arm. The wedge surface engages a cam surface on the primary member and is movable laterally in response to a movement of the primary member. A pair of laterally spaced rollers are positioned on opposite sides of the center axis of the housing and engage the short lever arm and an abutment surface on the secondary member.

Abstract: Angle setting mechanism, particularly for vises mounted on the table of a machine tool. There is provided an angle setting mechanism for use with vises, primarily on the table of a machine tool, which indicates a preselected angle with respect to said table. The vise is then aligned with respect to, preferably by contact against, said indicating device and clamped in position. In one preferred form of the vise, a guiding anchor member or slide is provided in the T-slot of the table and a block is positioned pivotally with respect thereto. Angle measuring means are provided therebetween whereby said block may be positioned with respect to said guide at a preselected angle and then clamped in such position. The vise is then brought to bear against said block, positioned with an appropriate face in contact therewith in order that the vise may assume said same angle and said vise is then clamped in position. The indicating device may then be removed if desired.