.~ Intermittently accelerated and receding members rotate in same path (alternating piston type)
DEFINITION
Classification: 418/18
(under subclass 16) Apparatus including a plurality of members each of which is rotatable about a common axis substantially in a common plane and having working chamber surfaces rotating in the same path, movement in one direction of at least one of the members being alternately and relatively increased and retarded whereby to expand and contact the working chamber and at least one of the members producing work.
