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US Patent: 1,437,774
Wrench
Patentees:
John C. Piechocki - Buffalo, NY
Edmund K. Boinski - Buffalo, NY

USPTO Classifications:
269/210, 81/137

Tool Categories:
wrenches : wrench adjustment types : quick adjust wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
R. A. Thomas
Wm. Koerth

Patent Dates:
Applied: Jun. 11, 1921
Granted: Dec. 05, 1922

Patent Pictures:
John C. Piechocki and Edmund K. Boinski patent December 5, 1922
USPTO pdf tiff
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Description:
Twin spring-loaded pawls in the movable jaw engage racks or a series of holes in the main shank. In one version, the pawls terminate in pins that engage the series of holes. In the second version, the pawls have small worm screws engaging racks on the main bar, which allow for finer adjustment.

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