US Patent: 1,391,179
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| Monkey Wrench
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Patent Dates:
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| Applied: |
Dec. 30, 1920 |
| Granted: |
Sep. 20, 1921 |
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Patent Pictures:
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Edwin J. Evans and George Hemphill Pat. September 20, 1921 |
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Description: |
| The slide drives a "steep pitch" spiral groove on a shaft. A shallower pitch set of grooves on the shaft move the adjustable jaw.
The wrenches are strongly made. The adjusting mechanism was also used in a pipe wrench patented March 27, 1923 (pat. no. 1,449,386). |
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