Work holders – Relatively movable jaws – With means for 'hold-down' component of force
Patent
1990-12-19
1992-04-28
Watson, Robert C.
Work holders
Relatively movable jaws
With means for 'hold-down' component of force
269244, 269258, 269266, 269154, 269156, B23Q 302
Patent
active
051080800
ABSTRACT:
An improved machine vise, particularly well suited for use on milling machines and the like, having an improved arrangement for securely holding workpieces of irregular shapes or several different, diversely sized workpieces simultaneously. The vise is provided with a fixed jaw and two movable jaws mounted in a side by side relationship such that each jaw is free to move back and forth into and out of a gripping relationship with the object being clamped. The two movable jaws are yoke driven on a shaft such that a single forward thrust of the yoke exerts a forward and downward pressure to move both jaws forward while at the same time allowing for a translational motion between said adjacent jaws. These jaws can thus simultaneously grip and secure individual workpieces of different dimensions or differently sized portions or cross-sections of the same workpiece. Each jaw may also be provided with individually mounted fingers that pivot into the best gripping relationship with the object being clamped. A multiplicity of gripping fingers are thereby set in gripping engagement with a workpiece by a single operation of the vise. An arrangement for exerting a downward pressure on the yoke is also provided. Thus, this vise is capable of clamping a workpiece in all three axes (face, ends and top) or any combination thereof. It is also possible to totally enclose the workpieces or any desired portion thereof. This vise is likewise capable of securely holding workpieces made of either hard or relatively soft materials.
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