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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
USPTO (New site tip)
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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.

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