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US Patent: 6,210
Sliding Wrench
Patentee:
Dexter H. Chamberlain - Boston, MA

USPTO Classifications:
81/168

Tool Categories:
wrenches : nut wrenches

Assignees:
William A. Dodge - Boston, MA

Manufacturer:
Unknown

Witnesses:
Henry F. Conant
Ezra Lincoln, Jr.

Patent Dates:
Applied: Jul. 20, 1848
Granted: Mar. 20, 1849

Patent Pictures:
Dexter H. Chamberlain patent March 20, 1849, with 12 inch example from Frank Kingsbury collection
USPTO pdf tiff
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Description:
Straps that extend along side the main bar of an adjustable nut wrench have teeth which engage screw threads cut inside the surface of a rotating cylindrical handle. No screw threads or teeth are exposed. A locking ring fixed to the shank and a screw-on end cap hold the rotating handle in place.

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