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US Patent: 78,176
Improvement in Wrenches
Patentee:
Joshua B. Barnes - Fort Wayne, IN

USPTO Classifications:
81/99

Tool Categories:
wrenches : pipe wrenches
wrenches : wrench adjustment types : self-adjust wrenches

Assignees:
None

Manufacturer:
C. Tresselt - Fort Wayne, IN

Witnesses:
G. J. Z. Rayhouser
William L. Gerard
J. V. White

Patent Dates:
Granted: May 26, 1868

Patent Pictures: [ 1 | 2 ]
Joshua B. Barnes patent May 26, 1868
USPTO pdf tiff
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Description:
The shape of the handle and movable jaw are similar to Barnes' June 4, 1867 patent (no. 65,465). This patent addresses the linkage between the handle and movable jaw, and a tension spring which makes the wrench self-adjusting.

Ken Cope's "American Wrench Makers, 1830-1930" shows an 1870 "Scientific American" listing which is the basis for the manufacturer attribution.

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