US Patent: 171,550
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| Screw Wrench
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Patentee:
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| John H. Coes (exact or similar names) - Worcester, MA |
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Patent Dates:
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| Applied: |
Jun. 19, 1871 |
| Granted: |
Dec. 28, 1875 |
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Patent Pictures:
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Patent 171550 - edited image |
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Stan Schulz
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Description: |
| The patent is for the relative arrangement of the reinforced wrench-bar, sliding jaw, and operating screw. It includes the "jog bar" on the back of the wrench bar. The specifications mention a back reinforcing rib like the Dec. 12, 1865 Lindsay patent (no. 514,65). The patent specifically cites the Richard patent no 27,090.
Wrenches with markings citing this patent may include the triangular "steam engine governor" trademark with patent dates "MAY 2 '71 & DEC 28 '75" on the sides, and a ferule shape reflecting patent no. 180,417.
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