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US Patent: 2,452,625
Screw and Toggle Adjusted Wrench and Clamp
Patentee:
Henry Alpers - Columbus, NE

USPTO Classifications:
81/375, 81/401

Tool Categories:
wrenches : wrench adjustment types

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Oct. 25, 1945
Granted: Nov. 02, 1948

Patent Pictures:
Henry Alpers Pat. Nov. 2, 1948
USPTO pdf tiff
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Description:
The movable jaw includes a lever handle and linkage with an "over the center" locking feature. A screw running the length of the tool positions the movable jaw relative to the fixed jaw. A clutch action in the movable jaw prevents moving the adjusting screw when the adjustable jaw is under load. The patent references patent nos. 444923, 723958, 754063, and 2391604.

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