Pumps – Expansible chamber type – Valved piston
Patent
1988-05-26
1989-09-19
Smith, Leonard E.
Pumps
Expansible chamber type
Valved piston
417552, 92107, F04B 2104
Patent
active
048676560
ABSTRACT:
A free piston to be slidably inserted in the cylinder of an electromagnetic reciprocating compressor. The piston has a partition wall dividing the inner space of the cylinder into chambers, and a rod connected to the partition wall. The partition wall has an air hole. A valve member is attached to the front surface of the partition wall, and usually closes the air hole of the partition wall. The rod extends rearwardly from the rear-end surface of the partition wall. The rod has a substantially conical hole which extends rearwardly from the front-end surface of the partition wall. The piston further comprises a retainer cap closing the opening of the substantially conical hole and holding the valve member in an openable condition.
REFERENCES:
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patent: 4255090 (1981-03-01), Pratt
patent: 4553472 (1985-11-01), Munro et al.
patent: 4648308 (1987-03-01), Matsui et al.
Willis T946,012 May 4, 1976 defensive publication.
Blackmon Robert N.
Nitto Kohki Co. Ltd.
Smith Leonard E.
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