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US Patent: 740,812
Interchangeable Wrench
Patentee:
Oliver E. Kovar (exact or similar names) - Newark, NJ

USPTO Classifications:
81/132, 81/184

Tool Categories:
wrenches : pipe and nut combination wrenches
wrenches : wrench components : pipe jaw attachments for wrenches
wrenches : wrench components : wrench handle components
wrenches : wrench components : wrench jaw components

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
C. B. Pitney
Charles H. Pell
Ralph Lancaster
Russell M. Everett

Patent Dates:
Applied: Apr. 17, 1903
Granted: Oct. 06, 1903

Patent Pictures: [ 1 | 2 ]
Oliver E. Covar patent Oct. 6, 1903
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Description:
The features claimed in the patent include (1) "lug" on fixed jaw that serves as catch for pipe gripping insert; (2) interchangeable jaws for nuts and pipe -- the jaws having an inserted toothed grip and set screw for secure clamping to the serrated main shank and (3) spring catch on removable handle.

An unmarked wrench with movable jaw having a clamping set screw and inserted gripping plate has been suggested as reflecting the intent of this patent.

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