(under the class definition) Subject matter comprising perfecting means to restrain or retain the means holding the parts together, the holding means being restrained against motion that would uncouple the joint.
SEE OR SEARCH THIS CLASS, SUBCLASS:
65+, for auxiliary detents in train line couplers.
80, for joints locked or sealed against unauthorized use.
305+, for a coupling comprising an essential catch.
403+, for separable fasteners essential to a socket joint.
SEE OR SEARCH CLASS 137, Fluid Handling,
614.06, and 637.05 for valved, separable flow path sections wherein the valves or their actuators may serve to block release of the means which joins the sections.
251, Valves and Valve Actuation,
89+, for means to block or disable a valve actuator and see the Search Notes thereunder, and subclass 149.9 for a valved pipe joint or coupling wherein the valve or its actuator blocks release of the means which makes the joint.
