One-way umbrella valve and portable fluid pumping device includi

Details One-way umbrella valve and portable fluid pumping device includi One-way umbrella valve and portable fluid pumping device includi

1991-11-25

1992-12-22

Bertsch, Richard A.

Pumps

Ambulant, body supported, or with carrying handle

137854, F16K 1514, F04B 1700

Patent

active

051730332

ABSTRACT:
A portable fluid pumping device includes a valve assembly having a pair of one-way umbrella valves controlling the flow of air to produce a positive pressure at one port and a negative pressure at another port. Each umbrella valve includes a valve stem having a neck received within the mounting opening, and an umbrella skirt integrally joined to the neck to overlie the valve opening. The umbrerlla skirt is relatively thin for its complete extent, and the juncture between the umbrella skirt and neck of the valve stem is of frusto-conical configuration increasing in diameter from the neck to the umbrella skirt.

REFERENCES:
patent: 87728 (1869-03-01), Bellows
patent: 3062601 (1962-11-01), Sadler
patent: 4010946 (1977-03-01), Miller
patent: 4204555 (1980-05-01), Durling
patent: 4414973 (1983-11-01), Matheson
patent: 4513784 (1985-04-01), Farrand
patent: 4540352 (1985-09-01), Becher
patent: 4696322 (1987-09-01), Knapp
patent: 4726745 (1988-02-01), Adahan
patent: 4781674 (1988-11-01), Redmond

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