Dispensing – With discharge assistant – Fluid pressure
Patent
1987-11-19
1990-04-24
Bartuska, F. J.
Dispensing
With discharge assistant
Fluid pressure
222213, 222107, B65D 8314, G01F 1100
Patent
active
049193120
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to collapsible chamber metering valves and to dispensing apparatus including such valves for use in pressurized dispensing containers.
PRIOR ART
It is known to provide dispensing apparatus for a pressurized dispensing container comprising a mounting cup peripherally secured to the container, a valve mounted in the cup member such that a valve stem of the valve extends through an aperture defined by the cup member and wherein the valve includes a collapsible chamber comprising an elastomeric vessel for metering a pre-determined volume of fluid to be dispensed, inlet valve means admitting pressurized fluid to the chamber from the container when the valve is in a closed condition and outlet valve means releasing fluid from the chamber through the valve stem when the valve is in an open condition to thereby dispense the pre-determined volume of fluid.
U.S. Pat. No. 3,104,785 discloses such an arrangement in which the elastomeric vessel is of generally tubular shape so as to surround the lower part of the valve. The vessel is secured in place by virtue of the valve cup being crimped around the container opening so as to grip a radially extending flange of the elastomeric vessel. An alternative arrangement is shown in DE 2043415 in which the elastomeric vessel is gripped by crimping the valve cup against the valve body with a tubular portion of the elastomeric vessel trapped therebetween.
A need exists for providing a simplified dispensing apparatus which can be more readily and simply fabricated and which provides high reliability. There is also a need to provide apparatus which will perform well under conditions of high internal fill pressure of the pressurized dispensing container.
SUMMARY OF THE INVENTION
According to the present invention there is disclosed a dispensing apparatus for use in a pressurized dispensing container and comprising a mounting cup member peripherally securable to the container, a valve mounted in the cup member such that at least a valve stem of the valve extends through an aperture defined by the cup member, which valve includes collapsible chamber means comprising an elastomeric vessel for metering a predetermined volume of fluid to be dispensed, inlet valve means admitting pressurized fluid to the chamber from the container when the valve is in a closed condition and outlet valve means releasing fluid from the chamber through the valve stem when the valve is in an open condition to thereby dispense the predetermined volume of fluid, characterized in that the mounting cup member includes a thermoplastic layer attached to its interior surface with respect to the container and the collapsible chamber means includes an annular bonding portion of a plastics material which is thermally bonded to the thermoplastic layer.
An advantage of such apparatus is that the assembly is simplified and readily incorporated in an automated production line. The thermal bond also provides a reliable and secure means of attaching the elastomeric vessel.
Preferably the annular bonding portion of the collapsible chamber means comprises an integrally formed flange of the elastomeric vessel.
Such a flange is then directly thermally bonded to the thermoplastic layer of the cup member.
Alternatively the annular bonding portion of the collapsible chamber means comprises a retaining ring having means for gripping an integrally formed flange of the elastomeric vessel in sealing contact with the mounting cup member.
The annular bonding portion may in either case comprise at least one annular groove in the bonding surface presented to the thermoplastic layer. An advantage of such grooves is that the release of globules of plastics materials during the thermal bonding process is inhibited by the presence of the grooves. In the absence of such grooves it has been found that contamination internally or externally with respect to the elastomeric vessel may occur from plastics material sputtered during the thermal bonding and by the use of grooves distributed suitably
REFERENCES:
patent: 3104785 (1963-09-01), Beard
patent: 3377004 (1968-04-01), Kjelson
patent: 3415425 (1968-12-01), Knight et al.
patent: 3858771 (1975-01-01), Bret et al.
patent: 4088248 (1978-05-01), Blake
patent: 4526297 (1985-07-01), Grimsley
patent: 4548338 (1985-10-01), Sander
Beard Walter C.
Yallop Michael D.
Bartuska F. J.
Bespak plc
Heinl Glenn L.
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