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US Patent: 110,789
Wrench
Patentee:
John F. Robertson (exact or similar names) - Warwick, NY

USPTO Classifications:
279/106, 81/112, 81/116

Tool Categories:
wrenches : wrench components : wrench jaw components
wrenches : nut wrenches

Assignees:
John F. Robertson - Warwick, NY
James H. Holly - Warwick, NY
John G. Knapp - Warwick, NY

Manufacturer:
Not known to have been produced

Witnesses:
Mahlon Cooper
Albe Francisco
C. H. Poole
W. H. Stebbins

Patent Dates:
Applied: Nov. 28, 1870
Granted: Jan. 03, 1871

Patent Pictures:
John F. Robertson Pat. Jan. 3, 1871
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Description:
The adjuster is a slide moved by a screw; the grooves in the adjuster and corresponding ridges on the jaws are slightly angled so that moving the adjuster opens and closes the jaw opening.

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