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US Patent: 2,550,010
One-Way Engaging Wrench Having Guided Work-Engaging Rollers
Patentee:
Alfred Kavalar - Detroit, MI

USPTO Classifications:
192/45, 81/106, 81/111, 81/183

Tool Categories:
wrenches : ratchet wrenches

Assignees:
None

Manufacturer:
T.K.F. - Detroit, MI

Witnesses:
Unknown

Patent Dates:
Applied: Aug. 23, 1949
Granted: Apr. 24, 1951

Patent Pictures:
Alfred Kavalar patent April 24, 1951
USPTO pdf tiff
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Description:
Ratchet action generated by rollers held in engagement with the work piece by springs. The patent claims this design would have more bearing surfaces and be less likely to damage the corners of hex nuts than flat jaw ratchets. The wrenches would also grip pipe. Marketed as "CAM-LOC."

The specifications cite patent nos. 602,283, 933,494, 1,200,430, 1,443,248, 2,371,653 and 2,411,739 as relevant prior art.

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