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US Patent: 446,592
Pipe Wrench
Patentees:
Thomas Jefferson Duncan (exact or similar names) - Leadville, CO
Dennis McManus (exact or similar names) - Leadville, CO

USPTO Classifications:
81/102, 81/110

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
John Law
Joseph S. Jones
C. S. Heyer
W. W. Mortimer

Patent Dates:
Applied: Jul. 01, 1890
Granted: Feb. 17, 1891

Patent Pictures:
Thomas Jefferson Duncan and Dennis McManus patent February 17, 1891
USPTO (New site tip)
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Description:
A rocking link that connects the fixed and movable jaws has an internal spur that engages rack teeth cut in one face of the slot in the movable jaw.

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