US Patent: 444,171
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| Wrench
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Patent Dates:
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| Applied: |
Jan. 02, 1890 |
| Granted: |
Jan. 06, 1891 |
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Patent Pictures:
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T.F. Vandegrift Pat. Jan. 6, 1891 |
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Description: |
| A spring holds the jaws open. A sliding wedge on the movable jaw and a yoke pivoting from the fixed jaw provide the adjusting means. The patent was realized as malleable iron nut or pipe wrenches.
Vandegrift received another patent for a different quick-adjusting pipe wrench a week later (pat. no. 444,511). |
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