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US Patent: 137,910
Improvement in Railroad Track Wrenches
Patentee:
Pierre L. Gibbs - Chicago, IL

USPTO Classifications:
81/34, 81/57.2, 81/57.29

Tool Categories:
wrenches : socket wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Geo. W. Hill
Godfrey Schmid
Fred. Haynes
Ferd. Lusch

Patent Dates:
Applied: Feb. 05, 1873
Granted: Apr. 15, 1873

Patent Pictures:
Pierre L. Gibbs. Pat. April 15, 1873
USPTO pdf tiff
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Description:
The socket has two interior spurs to catch the corners of nuts on fish-plate bolts. This allows one socket to fit a range of nut sizes. The socket is driven by bevel gears, turned by a "T" handle tall enough to be turned by a standing man. The wrench has a folding foot plate which clamps over the top of a rail to help hold it in position on the nut.

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