.~ With nonvalving movement (e.g., about valve stem) {2}
90.29
.~.~ Oscillating movement converted internally
DEFINITION
Classification: 123/90.29
(under subclass 90.28) Device wherein means is provided within the operating mechanism to convert the oscillation imparted to the valve by the compression and decompression of its return spring into unidirectional movement (i.e., rotation).
SEE OR SEARCH THIS CLASS, SUBCLASS:
90.28+, for devices generally similar to those of this subclass but involving (e.g., by attachment thereto) an element external to the operating mechanism.