US Patent: 734,329
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| Adjustable Wrench
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Patentee:
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| Elisha F. Hirst (exact or similar names) - Richmond, IN |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Apr. 18, 1903 |
| Granted: |
Jul. 21, 1903 |
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Patent Pictures:
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Elisha F. Hirst patent July 21, 1903 |
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Stan Schulz
Vintage Machinery entry for Hirst & Co.
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Description: |
| The interior spring creates side pressure to prevent the sliding jaw from moving freely. The rotating toothed spiral cam (which sets in a central slot in the shank) provides a stop to adjust the size of the jaw opening.
Although a cam-adjust nut wrench may seem unusual, a similar shaped cam independently conceived by a British inventor resulted in the BURSTON CAM SPANNER, based on British 1932 patent GB-384,468 -- also patented in the U.S. in 1936 - [2,053,033]. |
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