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US Patent: 1,502,192
Wrench and Process of Manufacturing the Same
Patentee:
John Helwig - St. Paul, MN

USPTO Classifications:
76/114

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

Assignees:
None

Manufacturer:
Helwig Mfg. Co. - St. Paul, MN

Witnesses:
E. A. Paul
M. R. McInnes
A. Helwig
M. Helwig

Patent Dates:
Applied: Mar. 01, 1917
Granted: Jul. 22, 1924

Patent Pictures:
John Helwig patent July 22, 1924
USPTO pdf tiff
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Description:
The initial application was renewed Oct. 20, 1921.

The slotted frame and "lip" that retains the adjusting screw are "bowed" to allow the movable jaw and adjusting screw to be inserted. The sides of the slot and the "lip" are then pressed into final position.

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