Orbital hold-down clamp

Details Orbital hold-down clamp Orbital hold-down clamp

1996-11-06

1998-02-17

Watson, Robert C.

Work holders

Relatively movable jaws

With means for 'hold-down' component of force

269229, 269 43, B23Q 302

Patent

active

057184216

ABSTRACT:
An orbital hold-down clamp assembly holds a workpiece in place on a platen against a stop or backjaw on the platen. The clamp assembly has four main parts. A screw cam has a threaded shaft and an offset tapered head; a clamp jaw has a distal gripping surface and a foot or fulcrum at the proximal edge; a flat rubber spring is positioned beneath the clamp jaw; and a T-nut mounts in a nest in the platen. The clamp jaw has a tapered opening that matches the taper of the cam head. The nut has a threaded bore that receives the screw shaft of the cam, and a head or top that serves as the base for the fulcrum and the spring. As the screw cam is tightened down, the cam moves the jaw forward against the workpiece, and also pulls the jaw downward into the spring. This rotates the jaw on the fulcrum, gripping the workpiece and urging it downward. Fixtures are provided for forming the T-nut and the screw cam so that each have a predetermined, repeatable angular relationship with respect to the associated screw thread.

REFERENCES:
patent: 274743 (1883-03-01), Du Shane
patent: D302277 (1989-07-01), Bishop
patent: 3408924 (1968-11-01), Mueller
patent: 3473420 (1969-10-01), Boggs
patent: 3747168 (1973-07-01), Snarskis
patent: 4139188 (1979-02-01), Avedian
patent: 4805888 (1989-02-01), Bishop
patent: 4955744 (1990-09-01), Barth et al.
patent: 5310299 (1994-05-01), Bernstein

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