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US Patent: 2,533,436
Self-Locking Wrench
John S. Collison - Campbell, NE

USPTO Classifications:
81/339, 81/382, 81/390

Tool Categories:
wrenches : pliers type wrenches : locking pliers

Roland B. Collison - Bruning, NE

Collison Mfg. Co. - Bruning, NE


Patent Dates:
Applied: May 29, 1946
Granted: Dec. 12, 1950

Patent Pictures:
John S. Collison Pat. Dec, 12, 1950
USPTO pdf tiff
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This improvement on the 1918 Collison-Wright patent (no. 1,280,405) adds a second set of movable pivots in the handle linkage which result in a self-locking action even though the wrench retains the swinging end loop to keep the handle in the "closed" position. The final assembly of these tools took place in a remodeled chicken coop behind a village feed mill; the parts were produced by contract firms and the feed mill employees assembled the tools during "slack time" at the mill.

The patent cites U.S. patent nos. 1,280,405, 2,324,187, and 2,445,480 and two German patents.

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