US Patent: 538,841 - Monkey Wrench


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US Patent: 538,841

Monkey Wrench

Patentee:

Vincent J. McDonnell (exact or similar names) - Philadelphia, PA

USPTO Classifications:

81/162, 81/DIG.3

Tool Categories:

wrenches : wrench adjustment types : quick adjust wrenches

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

J. Henderson

Jno. E. Parker

Horace Pettit

Patent Dates:
Applied:	Feb. 13, 1895
Granted:	May 07, 1895

Patent Pictures:

Vincent J. McDonnell patent May 7, 1895

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Description:

Quick-adjust nut wrench with final adjustment and position of movable jaw held by a "mutilated screw." The patent includes optional forms for the screw and an optional adjustment lock.

4th patent in an evolutionary sequence -- 402,265, 415,183 and 449,129 are earlier stages.