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US Patent: 608,767
Wrench
Patentees:
Lott Frederick - North Summit, PA
George  Hugh Dugan - North Summit, PA

USPTO Classifications:
81/137

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

Assignees:
Lott Frederick - North Summit, PA

Manufacturer:
Not known to have been produced

Witnesses:
A. G. Miller
Albert K. Williams, Jr.
Jared Fisher
I. C. Bender

Patent Dates:
Applied: Oct. 30, 1897
Granted: Aug. 09, 1898

Patent Pictures:
Lott Frederick and George Hugh Dugan patent August 9, 1898
USPTO pdf tiff
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Description:
Interrupted threads inside the adjusting barrel engage with threads on two edges of the shank to hold the adjustment. A motion limit stop marks he position when the threads are engaged. The movable jaw and a closing collar slide on the shank and keep foreign matter from entering the interior of the adjusting barrel.

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