(under the class definition) Apparatus including means forming a part of the working member for engagement with a relatively movable element, said means comprising (1) a spline extending longitudinally of the working member, (2) gear teeth or (3) a thread.
(1) Note. A piston having a portion thereof provided with a threaded or splined section for the sole purpose of securing a second piston portion rigidly therewith is excluded from this subclass. Such structure is classified below on other features.
SEE OR SEARCH THIS CLASS, SUBCLASS:
31+, for a rectilinearly moving working member and coaxial element interengaged for relative rotary movement in which the interengaging means includes a thread or spline on the working member.
217+, for an open ended skirt type piston formed of several parts in which the parts are detachably secured together by means of a threaded connection.
255+, for a piston formed of several parts in which the parts may be secured together by means of a threaded connection.
