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US Patent: 204,386
Wrench
Patentees:
Jacob H. Sievers - Valparaiso, IN
Henry T. Winkler - Valparaiso, IN

USPTO Classifications:
81/140

Tool Categories:
wrenches : wrench adjustment types : screw adjust wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
John E. Cass
Eggert Sievers

Patent Dates:
Applied: Mar. 18, 1878
Granted: May 28, 1878

Patent Pictures: [ 1 | 2 ]
Jacob H. Sievers and Henry T. Winkler patent May 28, 1878
USPTO pdf tiff
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Description:
The adjustable jaw is a separate piece with a threaded stud. The patent shows pipe and nut jaw pieces. The movable jaw is held by the thumb nut and tapered block. The tapered block cooperates with the thumb nut to tighten the grip of the jaws.

The patent model went through an online auction in 2017.

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