Positive discharge valve for viscous product dispenser

Details Positive discharge valve for viscous product dispenser Positive discharge valve for viscous product dispenser

1987-06-15

1988-12-27

Shaver, Kevin P.

Dispensing

With discharge assistant

Plural

222320, 222340, 222387, B65D 3700, G01F 1100

Patent

active

047935227

ABSTRACT:
A viscous product dispenser has a positive discharge valve which is opened upon a lost motion arrangement between the spout and the pump piston at the initial actuation of the spout. The lost motion is effected by spaced apart stops on these two members permitting limited sliding movement relative to the pump piston for opening the discharge valve before the pumping movement of the piston. A piston return spring is external to the pump chamber for biasing the discharge valve to a closed position.
A stop ring on the piston head may be provided for bearing engagement with an end wall of the container on which the container is mounted for isolating the load on the piston.

REFERENCES:
patent: 3257961 (1966-06-01), Schlenker
patent: 3268123 (1966-08-01), Spatz
patent: 3414169 (1968-12-01), Corsette
patent: 3640470 (1972-02-01), Susuki et al.
patent: 3940070 (1976-02-01), Boris
patent: 4511068 (1985-04-01), Bossina
patent: 4629097 (1986-12-01), Moore
patent: 4684043 (1987-08-01), Foster et al.
patent: 4691847 (1987-09-01), Ford et al.

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