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US Patent: 449,129
Monkey Wrench
Patentee:
Vincent J. McDonnell (exact or similar names) - Philadelphia, PA

USPTO Classifications:
81/162, 81/163, 81/DIG.4

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
John C. Gallen
R. M. Fleischmann
Horace Pettit
Wm. L. Nevin

Patent Dates:
Applied: May 12, 1890
Granted: Mar. 31, 1891

Patent Pictures:
Vincent J. McDonnell patent March 31, 1891
USPTO (New site tip)
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Description:
A "mutilated screw" engages rack teeth on the shank to set the adjustment. A small lever aids turning the mutilated screw. A secondary fine threaded screw that engages threads in the movable jaw provides additional adjustment.

3rd patent in an evolutionary sequence - prior patents are 402,265 and 415,183; 538,841 followed this one.

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