(under subclass 118) Subject matter having a cleaner.
(1) Note. The cleaner may, for example, be a movable scraper which scrapes the electrode tips or movable balls which knock carbon off the insulator.
(2) Note. Many spark plugs are "self cleaning" by virtue of their operating at a sufficiently high temperature to burn off carbon deposits. Such spark plugs are not classified in this subclass unless they have means for cleaning in addition to the means which produce the high temperature operation.
SEE OR SEARCH THIS CLASS, SUBCLASS:
120, for spark plugs having fluid feed or vent means, through which means a cleaner may be inserted to clean the electrodes or other parts.
125+, for this subject matter in which an electrode is movable as, for example, where an electrode can be rubbed against another electrode or where an electrode vibrates during use to shake off deposits or where a movable scraper is an electrode tip. SEE OR SEARCH CLASS
