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US Patent: 434,912
Wrench
Patentee:
Henry Bornstein - Boston, MA

USPTO Classifications:
81/163

Tool Categories:
wrenches : wrench adjustment types : screw adjust wrenches
wrenches : wrench components : wrench adjustment locks

Assignees:
Henry Bornstein - Boston, MA
Charles Green - Boston, MA

Manufacturer:
American Improved Wrench Company - Boston, MA

Witnesses:
M. F. Eager
K. Durfee
O. M. Shaw
Reuben Simmons

Patent Dates:
Applied: Jun. 17, 1890
Granted: Aug. 26, 1890

Patent Pictures: [ 1 | 2 ]
Henry Bornstein patent August 26, 1890
USPTO pdf tiff
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Description:
The patented features are the interiorly and exteriorly threaded body, and the check nut which can turn just enough to lock and unlock the movable jaw. The double threads speed adjustment.

Marketed as BORNSTEIN'S IMPROVED VISE WRENCH.

See also British patent GB-188802927 and Canadian patent CA-34,466 which appear to represent an intermediate stage between 338,707 and this patent.

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