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US Patent: 309,084
Wrench
Patentee:
Frederick G. Osborn - Newark, NJ

USPTO Classifications:
81/139, 81/140

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
John D. Barclay
Bennet Osborn, Jr.

Patent Dates:
Applied: Mar. 24, 1884
Granted: Dec. 09, 1884

Patent Pictures:
Frederick G. Osborn patent December 9, 1884
USPTO pdf tiff
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Description:
The interior of the movable jaw has a pawl lever with teeth that engage a rack on the main bar. The pivot point of the lever is loose enough that the strain is directly from the jaw to the pawl. A spring holds the pawl in engagement with the rack. A push button through the face of the movable jaw disengages the teeth for adjustment.

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