US Patent: 1,258,628
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| Wrench
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Patentee:
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| Arthur James Whitfield (exact or similar names) - Boston, MA |
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Patent Dates:
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| Applied: |
Apr. 23, 1917 |
| Granted: |
Mar. 05, 1918 |
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Patent Pictures:
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Arthur James Whitfield patent March 5, 1918 with 24 inch TRIMO pat 3-5-18 -- Doug Busch collection |
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Stan Schulz
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Description: |
| The patent is an improvement to Whitfield's June 20, 1916 patent (no. 1,187,690). The bearing surfaces of the frame holding the movable jaw and the abutment on the handle are modified to discourage "spreading" of that portion of the frame.
TRIMO pipe wrenches were produced marked with this patent date. |
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