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US Patent: 520,392
Wrench
Patentee:
Charles Carlson (exact or similar names) - Deer Trail, CO

USPTO Classifications:
81/161

Tool Categories:
wrenches : wrench adjustment types : quick adjust wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Chas. E. Dawson
C. J. Gallaudet
G. J. Lackey
J. C. Raynesford
Patent Dates:
Applied: Mar. 02, 1894
Granted: May 22, 1894

Patent Pictures:
Charles Carlson patent May 22, 1894
USPTO (New site tip)
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Description:
The adjusting nut has stops to limit rotation, and interrupted threads to allow for quick adjustment.

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