US Patent: 2,533,436
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| Self-Locking Wrench
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Patentee:
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| John S. Collison (exact or similar names) - Campbell, NE |
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Patent Dates:
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| Applied: |
May 29, 1946 |
| Granted: |
Dec. 12, 1950 |
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Patent Pictures:
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John S. Collison Pat. Dec, 12, 1950 |
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Stan Schulz
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Description: |
| 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.
Markings read, "COLLISON "S" WRENCH / COLLISON MFG. CO. BRUNING, NEBR / PAT. MAY 29, 1946"
The patent cites U.S. patent nos. 1,280,405, 2,324,187, and 2,445,480 and German patents DE-354317 and DE-486072. |
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