Two cylinder manual air pump

Details Two cylinder manual air pump Two cylinder manual air pump

1994-05-02

1995-08-22

Berisch, Richard A.

Pumps

Changeable by assembly or disassembly

417469, 417487, 417526, 417527, 417547, 417553, 92 59, F04B 2708, F04B 3300, F04B 3910

Patent

active

054433703

ABSTRACT:
An air pump comprises a head; an air guiding tube fastened at one end thereof with the head and at another end thereof with a two-way air admitting piston; a first cylinder fitted over the two-way air admitting piston such that the first cylinder can be caused to move back and forth; a first one-way valve disposed in the anterior end of the first cylinder; a second piston disposed in another end of the first cylinder; a first one-way valve permitting air to enter only the first cylinder; a second cylinder fitted movably over the second piston; and a second one-way valve disposed in the second cylinder to permit air to enter only the second cylinder which is fastened with the first cylinder without being able to move in relation to the first cylinder.

REFERENCES:
patent: 753530 (1904-03-01), Eyck
patent: 1149324 (1915-08-01), Stapley
patent: 1412279 (1922-04-01), Eslinger
patent: 3302535 (1967-02-01), Procter et al.
patent: 4508490 (1985-04-01), Ramirez et al.
patent: 5051073 (1991-09-01), Newbold
patent: 5165876 (1992-11-01), Wang

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