Self-adjusting toggle clamps for factory fixtures and the like

Details Self-adjusting toggle clamps for factory fixtures and the like Self-adjusting toggle clamps for factory fixtures and the like

1981-08-05

1983-10-04

Smith, James G.

Work holders

Relatively movable jaws

Clamp couple element with fastening means

269 94, 269228, 81367, B23Q 302

Patent

active

044074930

ABSTRACT:
Toggle clamps, such as used for factory fixtures, typically have clamping arms which in use extend over a workpiece or workpieces; to remove the workpieces and insert new ones, the clamping arms must be opened wide, typically through an angle greater than 90.degree.. In prior fixtures this is done by utilizing a conventional four-bar linkage; the fixed geometry of such linkages provides no tolerance for clamping workpieces of different thicknesses except by screw-adjustment of a clamping foot.
The present toggle clamp adjusts itself to a wide range of thicknesses. One of its members has a hollow containing a sliding locking wedge mechanism pivot-connected to the toggle link member of the mechanism; before it assumes the angle for toggle action, the wedge mechanism is held from locking by a cam on this link member. The sides of the hollow member are slotted, the pivot pin extends through the slot so that, for wide angle opening, the link can pull on the pin. In this way variable linkage geometry is provided, with the wedge mechanism sliding and the pin establishing its position in the slot as the clamping arm "sizes" the thickness of the workpiece, preliminary to clamping.

REFERENCES:
patent: 2777347 (1957-01-01), Sendoykas
patent: 3028577 (1962-03-01), Strauss
patent: 3600986 (1971-08-01), Baldwin

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