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US Patent: 1,371,965
Port Plug Wrench
Percy York - Duluth, MN

USPTO Classifications:
81/436, 81/460, 81/53.2

Tool Categories:
wrenches : automotive specialty wrenches


Not known to have been produced

none listed

Patent Dates:
Applied: Feb. 16, 1920
Granted: Mar. 15, 1921

Patent Pictures:
Percy York patent March 15, 1921
USPTO pdf tiff
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The external ribs on the wrench correspond to the design of port plugs. These were a feature of certain designs of internal combustion engines. Port plugs provided a relatively large access hole to the interior of the cylinder -- often to access valves in engine designs where the cylinder casting did not have a separate cylinder head. Port plugs typically had a central hole threaded for the spark plug. The initial portion of this patent's specifications describe the problems inherent in this arrangement.

Patent no. 1,380,562 is for a similar tool.

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