US Patent: 1,371,965
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Wrench
Port Plug Wrench
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| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Feb. 16, 1920 |
| Granted: |
Mar. 15, 1921 |
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Patent Pictures:
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Percy York patent March 15, 1921 |
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Stan Schulz
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Description: |
| 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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