Pump assembly with improved seal

Details Pump assembly with improved seal Pump assembly with improved seal

1981-04-03

1984-03-06

Freeh, William L.

Pumps

Expansible chamber type

Mechanically actuated distributor

417550, 222321, 222383, F04B 2104, F04B 3910

Patent

active

044351356

ABSTRACT:
A hand-actuatable pump assembly is adapted to be sealingly secured to the mouth of a container for dispensing material in the container. The pump assembly includes a generally tubular adapter that defines a discharge passageway. A spray member is seated on the adapter and defines a discharge opening in communication with the passageway. A stem defines a tubular portion that is secured to the adapter. A valve body defines a pressure chamber. A piston sealingly and slidably engages the wall of the valve body. The piston comprises a first portion that is clamped between the stem and the adapter, and a second deflectable portion in sealing engagement in a position of rest with the stem, and being out of sealing engagement with the stem in a second position of actuation. The deflectable portion of the piston is deflectable in response to hydraulic pressure upon movement of said piston downwardly into the valve body to expose the passageway to communication with the pressure chamber.

REFERENCES:
patent: 2509204 (1950-11-01), Van Ranst et al.
patent: 2984190 (1961-05-01), Dibley et al.
patent: 3257961 (1966-06-01), Schlinker
patent: 3724726 (1973-04-01), Susuki
patent: 3940028 (1976-02-01), Beard
patent: 3949910 (1976-04-01), Focht
patent: 3954354 (1976-05-01), Boris
patent: 4050860 (1977-09-01), Boris
patent: 4063854 (1977-12-01), Hayes

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