Dispensing – Plural sources – compartment – containers and/or spaced jacket – With discharge assistant for each source
Patent
1995-12-07
1998-05-19
Huson, Gregory L.
Dispensing
Plural sources, compartment, containers and/or spaced jacket
With discharge assistant for each source
222631, 2223217, B67D 532
Patent
active
057526273
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to pump-type distribution devices and, in particular, to such devices for distributing a product that is relatively viscous, e.g., cream, gel, or milk.
BACKGROUND OF THE INVENTION
Existing systems for distributing or spraying a product, e.g., by mixing the product with a gaseous fluid, do not provide optimum conditions of use and are not always convenient to use. For example, they are not necessarily suitable for distributing a relatively viscous product, particularly in the form of a spray, i.e., as a jet of fine drops. Additionally, when the spraying is carried out using pressurised gas at a high enough pressure to force the product and the gas towards the spray nozzle area, imperfect sealing--in particular, imperfect sealing of the fluid pressurisation chamber--can degrade the quality of, or even make impossible, spraying of the product.
Furthermore, the structure of existing spray pumps is often complex, giving rise to high production costs; they cannot usually be used in all positions; and they do not permit mixed distribution of products which can only be brought into contact at the moment of distribution, e.g., because of their composition or reactivity, while permitting simple and efficient structure.
SUMMARY OF THE INVENTION
Thus, an object of the invention is to provide a pump-type distribution device which includes a movable member that is mounted on a fixed member. The device includes a first chamber which communicates, by means of an inlet aperture for the product, with the container in which the product is contained. The inlet aperture can be closed selectively by first selective closing means. The device also has a second chamber which receives the product distribution fluid, e.g., a gas.
The movable member includes a first piston, which is supported by a tubular member, and a second piston. The movable member also has an external thruster for axial displacement of the first and second pistons in the first and second chambers, respectively. In a first, upward movement of the movable member for filling the chambers, the first selective closing means permit passage of the product from the container into the first chamber. In a second, opposite movement of the movable member to exert pressure on the contents of the two chambers, the first selective closing means closes the inlet aperture.
An axial rod is attached to the thruster and is mounted so as to slide inside the tubular member. This rod and the tubular member define first and second discharge passages which communicate at one end with the first and second chambers, respectively, and, at an opposite end, with a mixing area for output and distribution of the product, as mixed with the distribution fluid. The rod and the tubular member define, in two separate "cooperation areas," first and second valves which selectively open or close the first and second passages, respectively. According to the relative position of the rod inside the tubular member, the valves close the first and second passages during the first movement and open the first and second passages during the second movement, once the inlet aperture is closed.
The device according to the invention is particularly useful for spraying a product (in particular, a relatively viscous product) by means of a gas that is pressurised in the second chamber, even if there are slight leakages of gas from this chamber. This is because opening of the discharge passages is controlled not by the pressure of the gas, but by closing of the product inlet aperture and by the action of the first piston in the product chamber. Thus, satisfactory operation is ensured even at a gas pressure which is slightly lower than that determined to be appropriate for the device.
For structural simplicity and compactness, the fixed member may have a lower portion, the cross-section of which defines the first chamber. This lower portion may extend axially upward to include an upper portion with an upper cross-section that defines the second chamber. The tubular co
REFERENCES:
patent: 3581946 (1971-06-01), Meshberg
patent: 3860150 (1975-01-01), Maier
patent: 3926343 (1975-12-01), Kleiner
patent: 4179049 (1979-12-01), Umstead
patent: 5100029 (1992-03-01), Meshberg
patent: 5395032 (1995-03-01), Fuchs
Pileur Charles
Vandromme Michel
Huson Gregory L.
Sanofi (Societe Anonyme)
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