Double action piston having plural annular check valves

Details Double action piston having plural annular check valves Double action piston having plural annular check valves

1994-11-14

1995-09-12

Thorpe, Timothy S.

Pumps

Expansible chamber type

Plural pumping chambers

417527, 417547, 417553, 417566, F04B 3910

Patent

active

054492785

ABSTRACT:
An air pump piston is provided peripherally with a first leakproof ring and a second leakproof ring, which are located respectively and contiguously at both ends of the piston. Located peripherally between the first and the second leakproof rings is a radially disposed air hole. The piston is fastened at the second end thereof with a piston rod such that the air hole of the piston is in communication with an axial passageway of the piston rod. The piston is further provided peripherally between the first leakproof ring and the air hole with at least one first duct disposed radially. The piston is still further provided peripherally with at least one second duct which is disposed radially and located between the second leakproof ring and the air hole. The piston is provided at the first end thereof with an air admitting hole in communication with the first duct. The piston is provided at the second end thereof with an air duct in communication with the second duct. First and the second leakproof elements are fitted over the piston such that the first and the second ducts are sealed off respectively by the first and the second leakproof rings.

REFERENCES:
patent: 130642 (1872-08-01), Hussey
patent: 2683060 (1954-07-01), Wise et al.
patent: 3981625 (1976-09-01), Wickenberg
patent: 5051073 (1991-09-01), Newbold

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