US Patent: 636,247
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| Wrench
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Patentee:
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| Charles Engstrand (exact or similar names) - Hartford, CT |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jul. 22, 1899 |
| Granted: |
Nov. 07, 1899 |
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Patent Pictures:
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Charles Engstrand patent Nov. 7, 1899 |
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Stan Schulz
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Description: |
| The opening for the adjusting worm is angled, so that the main shank serves to retain the worm in the frame. The worm has a slot cut through its length to make interrupted threads which provide quick and screw adjusting options. |
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