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US Patent: 491,222
Wrench
Patentee:
Auguste Pellet (exact or similar names) - New York, NY

USPTO Classifications:
269/25, 269/279, 81/129, 81/97

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
J. Staib
Chas. H. Smith
A. M. Oliver
Geo. T. Pinckney

Patent Dates:
Applied: Dec. 02, 1892
Granted: Feb. 07, 1893

Patent Pictures:
Auguste Pellet patent February 7, 1893
USPTO (New site tip)
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Description:
The position of the adjustable jaw is controlled by incompressible fluid, based on the same principle as a hydraulic jack. The key element is two chambers in the cylindrical handle, with a valve between the chambers.

An internal compression spring will close the jaws if the release valve between the chambers is operated; the jaws would have be be opened manually with the release valve opened.

The movable jaw is equipped with a pipe gripping surface that can be swung into position.

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