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US Patent: 10,666
Screw-Wrench
Improvement in Screw or Coach-Wrenches
Patentee:
Dexter H. Chamberlain - Boston, MA

USPTO Classifications:
81/154

Tool Categories:
wrenches : nut wrenches
wrenches : wrench adjustment types : screw adjust wrenches
wrenches : wrench adjustment types : wedge adjust wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
R. H. Eddy
F. P. Hale, Jr.

Patent Dates:
Applied: Feb. 18, 1854
Granted: Mar. 21, 1854

Patent Pictures:
Dexter H. Chamberlain patent March 21, 1854
USPTO pdf tiff
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Description:
The position of the adjustable jaw in this sliding-jaw screw-wrench is held by the wedging action of a split center shank and a tapered center screw tightened and loosened by a knob on the end of the handle.

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