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US Patent: 297,640
Wrench
Patentee:
Friedrich Schmemann - Philadelphia, PA

USPTO Classifications:
81/129, 81/186, 81/356, 81/362, 81/409

Tool Categories:
wrenches : pipe wrenches
wrenches : wrench components : wrench handle components

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
W. F. Kircher
L. Douville
A. P. Grant
John Wiedersheim

Patent Dates:
Applied: Nov. 08, 1883
Granted: Apr. 29, 1884

Patent Pictures:
Friedrich Schmemann patent April 29, 1884
USPTO pdf tiff
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Description:
A tongs type wrench using a lever and link to shift and hold the movable jaw. The jaws will grip pipes or nuts. There is an adjustment in the lever linkage to accommodate different pipe sizes. The patent presents an alternate clamping means using a screw instead of the lever handle.

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