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US Patent: 289,506
Wrench
Socket Wrench With Expansion-Jaws
Patentee:
James Davidson (exact or similar names) - Central City, CO

USPTO Classifications:
279/55, 81/115

Tool Categories:
wrenches : socket wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
C. Sedgwick
Chas. J. Howell
Henry M. Gray
John Best

Patent Dates:
Applied: Apr. 27, 1883
Granted: Dec. 04, 1883

Patent Pictures:
James Davidson patent December 4, 1883
USPTO (New site tip)
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Description:
The outer sleeve rotates the sliding loop carrying the top of the jaws. The top of the rotating sleeve is either formed with flats to be turned by a secondary wrench, or with holes for insertion of a rod handle. The drawing shows the rod handle version. The jaws are spread apart by a compression spring, and closed by the taper of the outer sleeve.

The specifications describe it as useful for the square shafts of water stops. An alternate tri-cornered jaw form for hex nuts is also described.

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