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US Patent: 1,155,955
Improvements in Pipe and Nut Wrenches
Patentee:
George A. Parmenter - Boston, MA

USPTO Classifications:
81/103

Tool Categories:
wrenches : pipe and nut combination wrenches
wrenches : wrench adjustment types : quick adjust wrenches

Assignees:
None

Manufacturer:
Parmenter Manufacturing Co. - Boston, MA

Witnesses:
Unknown

Patent Dates:
Applied: Jun. 02, 1915
Granted: Oct. 05, 1915

Patent Pictures: [ 1 | 2 ]
G. A. Parmenter Pat. Oct. 5, 1915
USPTO pdf tiff
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Description:
The sliding casing has a pin that engages notches on the main shank, while the movable jaw attached to the casing has notches which engage an extension on the shank. A spring inside the casing keeps the notches and pins engaged, and the end of the casing extending toward the handle has a gripping surface. This patent and Parmenter's Oct. 16, 1917 patent (no. 1,243,210) are both cited on the quick adjusting pipe and nut wrench his company manufactured.

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