Rolling diaphragm barrier for pressurized container

Details Rolling diaphragm barrier for pressurized container Rolling diaphragm barrier for pressurized container

1984-10-05

1986-01-07

Rolla, Joseph J.

Dispensing

With discharge assistant

Container with follower

222389, B67D 104

Patent

active

045629420

ABSTRACT:
A pressurized thin walled can from which a fluent pressurized product is dispensed through a discharge valve. The pressurized can is divided into a product chamber and a propellant chamber by an impervious flexible diaphragm, preferably shaped in the form of a cup and formed of a plastic material, which is mounted to the wall inside the can and away from the can ends. As product to be dispensed is introduced into the product chamber, the flexible diaphragm is extended down into the can. As the product is later expelled through a discharge valve, the flexible diaphragm is fully everted in the upper region of the can to expel all the product. The can is thin walled, and upon being pressurized, the can diameter expands slightly. In one embodiment, a ring inside the can holds the flexible diaphragm in place. The ring includes a portion which expands to maintain the seal with the expanding can side wall. In another embodiment the ring is rigid, but of slightly larger diameter than the can. This ring stretches the can, so as to maintain the sealing contact with the can as the can expands.

REFERENCES:
patent: 1641742 (1927-09-01), Dawson
patent: 2811818 (1957-11-01), McCarty
patent: 3070265 (1962-12-01), Everett
patent: 3140802 (1964-07-01), Everett
patent: 3233779 (1966-02-01), Cornelius
patent: 3273762 (1966-09-01), O'Neill
patent: 3312378 (1967-04-01), Featherstone et al.
patent: 3862708 (1975-01-01), Waxlax
patent: 3923208 (1975-12-01), Bergloff
patent: 3931834 (1976-01-01), Caillet
patent: 4109833 (1978-08-01), Gross
patent: 4271991 (1981-06-01), Diamond

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