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US Patent: 359,197
Pipe Wrench
Isaac Anderson - Saginaw, MI

USPTO Classifications:
81/90.3, 81/91.2

Tool Categories:
wrenches : pipe wrenches

Thomas H. Smith - Saginaw, MI
Isaac Anderson - Saginaw, MI

Isaac Anderson - East Saginaw, MI

Villette Anderson
Philip C. Masi
F. A. King
Thos. G. Derry

Patent Dates:
Applied: Aug. 10, 1886
Granted: Mar. 08, 1887

Patent Pictures:
Isaac Anderson patent March 8, 1887
USPTO pdf tiff
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A compound hook variation on the hook-jaw pipe wrench theme, evolved from Anderson's 1886 patent no 340,410. The end of the lever acts as a cam to wrap the jaw segments around the work piece. A spring holds the jaws closed. The jaw pivot can be shifted in a slot for size adjustment.

Ken Cope's "American Wrench Makers 1830-1930" notes Anderson was advertising the wrench in 1887.

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