.~ Shaped electrode chamber, insulator end, shell skirt, baffle or gas directing means
DEFINITION
Classification: 313/143
(under subclass 118) Subject matter having means to provide an electrode chamber of significant shape, or having an insulator whose exposed cylinder end has a significant shape, or having a shell skirt of particular shape, or having a baffle or gas directing means.
(1) Note. The insulator end, for example, may be ridged so as to provide a longer leakage current path. The baffle, for example, may prevent oil vapor from reaching the insulator, or it may cause gas currents to concentrate in the vicinity of the electrode points.
(2) Note. The baffle may or may not be movable.
(3) Note. Spark plugs in combination with separable adapters are not included herein. See Class 123, Internal-Combustion Engines, subclass 169 for this combination. Adapters which are no more than a pipe fitting with means to attach the plug at one end and the fitting to the plug at the other end and which include joint structure will be found in the appropriate subclasses of Class 285, Pipe Joints or Couplings. Fittings or adapters which include flow regulator or baffle structure are classified in Class 138, Pipes and Tubular Conduits, subclasses 37+.
SEE OR SEARCH THIS CLASS, SUBCLASS:
127, for spark plugs having a movable cleaner, such as, for example, a movable scraper within the electrode chamber.
