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US Patent: 1,161,777
Pipe Wrench
John La Rock - Chicago, IL

USPTO Classifications:

Tool Categories:
wrenches : pipe wrenches : pipe tongs

John La Rock - Chicago, IL
Terence F. McKenna - Chicago, IL

Mechanical Specialties Company - Chicago, IL

Terence F. McKenna
Gertrude E. Dowle
W. L. Hall

Patent Dates:
Applied: Jan. 09, 1915
Granted: Nov. 23, 1915

Patent Pictures: [ 1 | 2 ]
John LaRock patent November 23, 1915
USPTO pdf tiff
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Compound leverage tongs type wrench; the advantage is ability to grip and turn pipe very close to walls, or other closed-in situations. The jaws are thin at the ends, and enclose 2/3rds the circumference of a pipe. The wrench fits a predetermined size, so a range of pipe sizes would require several wrenches. The specifications note the leverage is sufficient to have the jaws adapted to form hoof nippers.

Contemporary "new product announcements" suggest one use for the wrench was in conjunction with electrical conduit; it was also promoted for use on air, steam and water piping on railroad rolling stock and locomotives.

Known example marked LA ROCK WRENCH 1 IN is approx. 16 1/2 inches long.

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