US Patent: 12,590
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Improvements in Constructing Adjustable Wrenches Screw-Wrench
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Manufacturer: |
Not known to have been produced |
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Patent Dates:
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Granted: |
Mar. 27, 1855 |
Patent Pictures:
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L.D. Gilman Pat. March 27, 1855 |
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Stan Schulz
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Description: |
A hinged toothed segment is held in engagement with rack teeth cut on the main shank by the action of a cam lever. The cam lever is connected to the toothed segment by a strap. There is no screw adjustment, so the official title is misleading.
The design was radically revised by Gilman's July 17, 1855 Added Improvement AI125.
In October 1867 Gilman sought a reissue of the patent; the claims portion of that reissue application was reproduced in the Oct. 30, 1867 AMERICAN ARTISAN. |
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