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US Patent: RE9,310
Self-Adjusting Watch Key
Improvement in an Adjustable Holding Device and Watch-Key
Patentee:
John S. Birch (exact or similar names) - Orange, NJ

USPTO Classifications:
7/101, 81/112

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

Assignees:
None

Manufacturer:
J. S. Birch & Co. - New York, NY

Witnesses:
W. J. Morgan
A. P. Thayer
Charles R. Searle

Patent Dates:
Applied: Jun. 11, 1880
Granted: Jul. 20, 1880

Reissue Information:
Reissue of 88,836 (Apr. 13, 1869)

Patent Pictures:
J.S. Birch Reissue Pat*d July 20, 1880
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Description:
The spring-loaded jaws open when the opposite end is pushed in. The specifications for the reissue expand on the potential uses compared to the original patent.

The reissue is roughly co-terminous with an 1880 Scientific American advertisement for Birch's Self-Adjusting Watch Key reprinted in Ken Cope's "American Wrench Makers 1830-1930."

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