with coaxially-mounted members having continuously-changing circumferential spacing between them

Full Title

Rotary-piston pumps specially adapted for elastic fluids (with fluid ring or the like F04C19/00; rotary-piston pumps in which the working-fluid is exclusively displaced by one or more reciprocating pistons F04B) > of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents > with coaxially-mounted members having continuously-changing circumferential spacing between them

Child Classifications

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• F04C 18/067 having cam-and-follower type drive
• F04C 18/07 having crankshaft-and-connecting-rod type drive
• F04C 18/073 having pawl-and-ratchet type drive
• F04C 18/077 having toothed-gearing type drive