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US Patent: 506,261
Wrench
Patentee:
Helfred John Rosenberg (exact or similar names) - St. Louis, MO

USPTO Classifications:
81/142, 81/177.1

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

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
H. A. Carhart
D. May Goodrich
P. B. Taylor
John H. Boogher

Patent Dates:
Applied: Apr. 08, 1893
Granted: Oct. 10, 1893

Patent Pictures:
Helfred John Rosenberg patent October 10, 1893
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Description:
The two sections slide in relation to each other in a dovetail slide; the "lower" section has rack teeth cut in one edge. A sliding toothed "dog" engages the rack teeth holds the adjustment.

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