US Patent: 137,908
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Screw-Wrenches
Improvements in Monkey-Wrenches
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Patentee:
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| David Frank (exact or similar names) - Allentown, PA |
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Patent Dates:
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| Applied: |
Mar. 21, 1873 |
| Granted: |
Apr. 15, 1873 |
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Patent Pictures:
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David Frank patent April 15, 1873 with example |
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Stan Schulz
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Description: |
| The adjusting mechanism is two gear wheels inside the movable jaw, that mesh with gear teeth cut on the main bar. They also mesh with each other to hold adjustment. A toggle moves one of the gear wheels to allow adjustment of the movable jaw.
Known example marked "Mf'd by D. Frank & Co. Allentown, PA // Pat. Apr. 15th 1873 by D. Frank." |
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