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US Patent: 468,648
Wrench
Patentee:
Thomas A. Ferguson - Lyons, NE

USPTO Classifications:
81/129.5, 81/92

Tool Categories:
wrenches : wrench adjustment types : self-adjust wrenches
wrenches : pipe wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
C. Sedgwick
J. H. Theberath
T. H. Fritts
C. M. Fullerton

Patent Dates:
Applied: May 22, 1891
Granted: Feb. 09, 1892

Patent Pictures:
Thomas A. Ferguson patent February 9, 1892
USPTO pdf tiff
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Description:
Pipe wrench with spring-loaded rocking movable jaw; size adjustment accomplished by a clamped sliding block with teeth that engage rack teeth on the divided shank. A screwdriver is needed to reset this clamp.

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