(under subclass 116) Apparatus in which the means reversing direction of flow includes a volume increasing means for such purpose carried by the filling means and operative upon disconnection from the receiver.
(1) Note. The referred to head is of telescoping or equivalent-type chamber and becomes compressed when engaged with the receiver. Disengaging the head and receiver permits the head to expand and act as a vacuum pump.
SEE OR SEARCH THIS CLASS, SUBCLASS:
60, for a vacuum pump means comprising a receiver coupling portion of the system.