US Patent: 488,431


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US Patent: 488,431

Wrench

Patentee:

John H. Gregory (exact or similar names) - Ione, CA

USPTO Classifications:

81/141, 81/97

Tool Categories:

wrenches : pipe wrenches

Assignees:

John H. Gregory - Ione, CA

Jacob Newman - Ione, CA

Manufacturer:

Not known to have been produced

Witnesses:

Patent Dates:
Applied:	Mar. 28, 1892
Granted:	Dec. 20, 1892

Patent Pictures:

John H. Gregoary patent December 20, 1892

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Description:

Pipe wrench. A spring on the movable jaw positions the rocking gripper. A cam lever locks and releases the engagement of teeth on the movable jaw and teeth on the main shank to set the size adjustment.

An optional metal handle has square wrench openings sized for the square studs on pipe plugs.