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US Patent: 2,991
Screw-Wrench
Patentee:
John Williams, Jr. - Salem, NY

USPTO Classifications:
126/59, 81/164

Tool Categories:
wrenches : wrench adjustment types : screw adjust wrenches
wrenches : nut wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
John King
Andrew L. Thompson

Patent Dates:
Granted: Mar. 04, 1843

Patent Pictures:
John Williams, Jr. patent March 4, 1843
USPTO pdf tiff
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Description:
The wrench shank is threaded, and engages threads cut in the movable jaw. The jaws are kept in alignment by a pin running parallel to the shank. The drawing shows a version with the end jaw rotating freely. The specifications describe an alternate version where the end of the shank has left-hand threads engaging threads in the end jaw, which would double the adjusting speed.

Some of these ideas are very similar to early 20th Century French designs such as the Lacheze patents 841,946 and 988,336.

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