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US Patent: 3,555,939
Adjustable Open End Wrench
Kenneth F. Halls - Broomfield, CO

USPTO Classifications:
81/165, 81/172

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

Eugene E. Petersen - Omaha, NE

Petersen Tool Co. - El Dorado, KS
Petersen Tool Co. - Towanda, KS

none listed

Patent Dates:
Applied: Jan. 10, 1968
Granted: Jan. 19, 1971

Patent Pictures: [ 1 | 2 ]
Kenneth F. Halls Patent January 19, 1971
USPTO pdf tiff
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The movable jaw adjusts by an internal worm gear driven through bevel gears by a slide-powered helix grooved shaft. The specifications refer to patent numbers 3,368,432, 1,391,180, 3,125,911, 2,795,987, and 2,753,748.

Initial production took place in Kansas. After the company failed, later production was imported from Japan. Those are marked QUALI-KRAFT, with this patent number and "Made In Japan."

The side plate feature giving access to the adjusting mechanism reappears in modified form in a wrench produced under design patent D524,126.

The specifications note patent nos. 1,391,180, 2,753,748, 2,795,987, 3,125,911 and 3,368,432 as relevant prior art.

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