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US Patent: 2,810,313
Open-End Ratchet Wrenches of the Spanner Type
Raymond W. Hermanson - Los Angeles, CA

USPTO Classifications:
81/176.3, 81/61, 81/DIG.800

Tool Categories:
wrenches : spanner wrenches

Plomb Tool Co. - Los Angeles, CA

Not known to have been produced


Patent Dates:
Applied: Jun. 18, 1954
Granted: Oct. 22, 1957

Patent Pictures:
Raymond W. Hermanson patent Oct. 22, 1957
USPTO pdf tiff
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Swinging pawls with internal springs and "stops" to limit their swing provide the grip for this ratcheting spanner. These would have to exactly match the circumference of the notched ring they are designed to turn.

U.S. Patents 620,143, 810,304, 1,198,913, 1,913,906, 2,578,687, 2,659,257, 2,700,315 and German patent DE-828,676 are cited as references.

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