Compact manual air pump having selectable high volume and high p

Details Compact manual air pump having selectable high volume and high p Compact manual air pump having selectable high volume and high p

1997-04-21

2000-02-22

Freay, Charles G.

Pumps

Expansible chamber type

Having separate noncyclic valve

417468, 417528, F04B 102, F04B 2300

Patent

active

060273194

ABSTRACT:
A pump comprises a pair of coaxial pistons, one slidably positioned in the other for simultaneous compression causing similarly directed air flow, independent passages and valves for permitting air flow from each piston into the pump head for increased air flow, and a switching device for selectively opening one passage to ambient to decrease the air flow into the pump head. The pump thus has two modes, namely a high volume mode when the two pistons operate simultaneously to direct combined air flow and a high pressure mode when the passage is opened to ambient to direct air flow from only one of the two pistons.

REFERENCES:
patent: 5779457 (1996-03-01), Chuang et al.

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