US Patent: 354,770
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| Wrench
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Patentee:
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| Matthew E. Campfield (exact or similar names) - Sterling, OH |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Mar. 25, 1886 |
| Granted: |
Dec. 21, 1886 |
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Patent Pictures:
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Matthew E. Campfield patent Dec. 21, 1886 |
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Stan Schulz
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Description: |
| A lever in the base of the movable jaw raises and lowers a toothed pawl. The internal linkage and compression spring act to keep the pawl engaged with rack teeth cut in the face of the shank. This design allows for one-handed operation.
Ken Cope's "American Wrench Makers 1830-1930" speculates the Sterling Wrench Company may have produced this Campfield patent. |
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