(under subclass 118) Subject matter provided with a passageway for a fluid extending through the spark plug structure from the interior of the spark plug to the exterior or to a fluid feed line so that a liquid or gas may flow between the electrode chamber and the exterior of the spark plug or the fluid feed line.
(1) Note. The passageway may be provided with a valve so that the fluid may pass in one direction only or have a valve so that the fluid feed line may be closed or opened as desired.
(2) Note. The fluid feed or air vent, for example, may supply priming fluid to the ignition spark gap space, or may blow oil off the electrodes or allow some of the burned gas to escape. Included in this subclass are spark plugs in combination with integral fuel injection nozzles.
(3) Note. The fluid feed or air vent may, for example, act
as an observation port for visual inspection of the ignition spark gap or as a port for the insertion of a cleaner.
SEE OR SEARCH THIS CLASS, SUBCLASS:
11.5, for this subject matter when the fluid passageway is for the purpose of supplying a cooling fluid (e.g., air) to the spark plug. 119, for spark plugs having valve means arranged so that the interior of the plug or part of the shell may be sealed off to permit removal or inspection of at least part of the plug without stopping the engine.
143, for spark plugs having gas directing means, such as baffles or valves in the electrode chamber where there is no fluent passageway between the interior and the exterior of the plug.
231.01+, for other discharge devices which have a fluent material supply means or flow directing means.
SEE OR SEARCH CLASS
123, Internal-Combustion Engines,
179.9+, for priming devices for internal combustion engines.
137, Fluid Handling,
455+, for automatically operated valves responsive to the fluid passing through the valve, see especially subclasses 511+ for automatically operated check valves.
239, Fluid Sprinkling, Spraying, and Diffusing, appropriate subclasses, for fuel injection nozzles for internal combustion engines, especially
86, 96, and 584+. See also (2) Note, above.
251, Valves and Valve Actuation, appropriate subclasses for manually operated valves.
