US Patent: 198,685
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| Improvement in wrenches
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Patentee:
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| Sylvanus Edward Robinson (exact or similar names) - Newark, NJ |
| USPTO Classifications: |
| 81/73 |
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Patent Dates:
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| Applied: |
Nov. 10, 1877 |
| Granted: |
Dec. 25, 1877 |
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Patent Pictures:
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Sylvanus E. Robinson patent Dec. 25, 1977 |
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Stan Schulz
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Description: |
| One known example marked "Robinsons Crank Wrench & Bit Brace Newark N.J. Pat. Jan. 26, 1875, Dec. 25, 1877"
One strange variant (see also Robinson's Jan. 26, 1875 patent no. 159,119) has a hammer poll for the crank handle, with the frame extended to form a claw -- the fulcrum point for the claw would "clash" with the knob for the jaw adjusting screw.
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