US Patent: 618,485
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| Wrench
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Patentee:
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| William Rodman Smythe (exact or similar names) - Madison, SD |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jan. 21, 1898 |
| Granted: |
Jan. 31, 1899 |
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Patent Pictures:
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William Rodman Smythe patent January 31, 1899 |
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Stan Schulz
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Description: |
| Adjustment is accomplished by sliding a connecting pin that fits in the intersection of differently angled slots in the main shank and movable jaw.
From the specifications -- "The theory of the operation is as follows: When force is applied at J, it is communicated from the lower side of the slot D through P to the upper side of the slot C. At P this force is resolved into two forces, one of which tends to cause P to move down in slot C, and the other tends to cause it to move up in slot D. The slots C and D are placed at such an angle to each other that these forces balance each other at P. Therefore P cannot be moved by any force applied at J."
Compare this to Wm. Cronk's Oct. 22, 1912 patent no. 1,041,967. |
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