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US Patent: 1,012,036
Nut Guard
John H. Vinton - Boston, MA

USPTO Classifications:
81/100, 81/166, 81/180.1

Tool Categories:
wrenches : wrench components

Trimont Manufacturing Company - Roxbury, MA

Trimont Manufacturing Company - Roxbury, MA

Warren O'Neil
Fred. S. Greenleaf
Thomas J. Drummond
Louis C. Smith

Patent Dates:
Applied: Jun. 23, 1911
Granted: Dec. 19, 1911

Patent Pictures: [ 1 | 2 | 3 | 4 ]
John H. Vinton patent Dec. 19, 1911 -- TRIMO NUT GUARD
USPTO pdf tiff
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The "U" shaped nut guards protect against accidental alteration of the adjustment if the wrench rubs against a surface in use. The frame has a modified opening to accommodate them. The feature appears on TRIMO pipe and nut wrenches.

The patent is stamped on the wear surface of the metal "U" -- PAT'D 12-19-11.

See also parallel patent no. 1,012,037 for the "flat washer" style nut guard.

Patent no. 1,430,955 is a later refinement of the nut guard, and shows a frame style that was in use for TRIMO nut wrenches as early as 1912.

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