US Patent: 1,391,251 - Slip-jaw wrench


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US Patent: 1,391,251

Slip-jaw wrench

Patentee:

Michael I. Ginsburg (exact or similar names) - Philadelphia, PA

USPTO Classifications:

81/165, 81/DIG.3

Tool Categories:

wrenches : wrench adjustment types : screw adjust wrenches

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

Unknown

Patent Dates:
Applied:	Apr. 02, 1919
Granted:	Sep. 20, 1921

Patent Pictures:

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Description:

This wrench design holds tightly when rotated in one direction and releases when rotated in the opposite direction. See also Canada patent CA-224,157.