US Patent: 518,818 - Pipe Wrench


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US Patent: 518,818

Pipe Wrench

Patentees:

Edwin M. Jackson (exact or similar names) - Chicago, IL

Frank Roberts (exact or similar names) - Chicago, IL

USPTO Classifications:

81/90.2

Tool Categories:

wrenches : pipe wrenches

wrenches : wrench adjustment types : self-adjust wrenches

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

W. C. Corlies

Jno. A. Christiansen

Louis K. Gillson

Patent Dates:
Applied:	Jan. 08, 1894
Granted:	Apr. 24, 1894

Patent Pictures:

Edwin M. Jackson and Frank Roberts patent April 24, 1894

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Description:

"The invention consists of the use of two jaws, one pivoted upon the other, and a handle in the form of a lever pivoted to one of the jaws and bearing as a cam, upon the other, so as to close the jaws together."