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US Patent: 2,751,801
Self-Adjusting Plier-Type Toggle Locking Wrench
John L. Hostetter - Murray, NE

USPTO Classifications:
81/378, 81/398

Tool Categories:
wrenches : pliers type wrenches : locking pliers


Not known to have been produced


Patent Dates:
Applied: May 17, 1954
Granted: Jun. 26, 1956

Patent Pictures:
John L. Hostetter patent June 26, 1956
USPTO pdf tiff
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The adjustment is created by wedge-shaped components sliding past each other. The compression spring in the butt of the handle keeps the wedges in contact with each other.

This is the earliest of several patents used by Leverage Tool of Glenvil, Nebraska. In the second and successive patents, the wedges are in the handle. See patent nos. 3,116,656, RE26,680, and 3,600,986 for the evolution.

Stanley bought Leverage Tool in 1982.

The specifications cite previous patents 952,079, 2,452,625, 2,487,281, 2,499,201, 2,531,285, 2,533,817, & 2,661,648 as references.

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