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US Patent: 221,299
Nut-Lock
Patentee:
William Gray (exact or similar names) - Beardstown, IL

USPTO Classifications:
411/144, 411/955, 411/975, 81/125

Tool Categories:
wrenches : auxiliary wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
C. Clarence Poole
Frank L. Middleton

Patent Dates:
Applied: Aug. 09, 1879
Granted: Nov. 04, 1879

Patent Pictures:
William Gray patent Nov. 4, 1879
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Description:
The patent encompasses a washer with spiral "wedges" and outside diameter larger than the nut, a nut with corresponding tapering grooves, the die to form the shapes, and a wrench with auxiliary gripping lever to hold the washer when removing the nut.

One intended use was bolts holding railroad "fish plates" connecting sections of rail. The patent notes prior art as represented in patent no. 135,052.

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