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US Patent: 2,428,949
Wrench With Toggle Actuated Jaw
Patentees:
Vincent S. Ward - Binghamton, NY
Gordon K. Hurlbut - Binghamton, NY

USPTO Classifications:
81/367, 81/405, D8/22

Tool Categories:
wrenches : pliers type wrenches : locking pliers

Assignees:
B.M.C. Manufacturing Corporation - Binghamton, NY

Manufacturer:
Not known to have been produced

Witnesses:
none listed

Patent Dates:
Applied: Mar. 22, 1946
Granted: Oct. 14, 1947

Patent Pictures:
Vincent S. Ward and Gordon K. Hurlbut patent October 14, 1947
USPTO pdf tiff
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Description:
Adjustable jaw on a parallelogram frame, with one corner shifted by a spiral cam to accomplish the size adjustment.

Patent nos. 249,477 and 2,420,020 are cited as references.

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