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US Patent: 22,947
Improvement in Construction of Screw Wrenches
Foster's Unyielding Grip Wrench
Patentee:
Dan P. Foster - Shelburne Falls, MA

USPTO Classifications:
81/104

Tool Categories:
wrenches : pipe and nut combination wrenches
wrenches : nut wrenches
wrenches : wrench adjustment types : screw adjust wrenches

Assignees:
None

Manufacturer:
D. P. Foster - Shelburne Falls, MA
D. P. Foster - Waltham, MA

Witnesses:
C. C. Tolman
H. S. Greenleaf

Patent Dates:
Granted: Feb. 15, 1859

Reissue Information:
Reissued as RE5,914 (Jun. 16, 1874)

Patent Pictures: [ 1 | 2 ]
Dan P. Foster patent February 15, 1859, with 1870 J.J. WALWORTH catalog listing
USPTO pdf tiff
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Description:
The adjustable jaw "floats" in relation to shank and fixed jaw. Manufacturer info. taken from Kenneth Cope's "American Wrench Makers 1830-1930." Header on reissue patent No. 5,914 notes the patent was extended seven years from the original expiration.

An 1870 WALWORTH catalog lists 3 sizes - 10", 14" and 18".

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