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US Patent: 340,233
Wrench
Patentee:
Austin McNally - Cascade, IA

USPTO Classifications:
81/141

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Norris A. Clark
A. W. Bishop
Jas. A. Hayes
James Moore

Patent Dates:
Applied: Feb. 15, 1886
Granted: Apr. 20, 1886

Patent Pictures:
Austin McNally patent April 20, 1886
USPTO pdf tiff
Google Patents
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Description:
The spring closes the jaws. The cam lever engages and disengages the rack that holds the adjustment. The shape of the rack teeth allows the teeth to disengage on "back motion", thereby giving the wrench ratchet action.

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