Note: Descriptions are shown in the official language in which they were submitted.
1056780
The invention relates to a dispenser for receiving and dis-
pensing liquid and pasty compositions under pressure, which device has
a pressure-resistant outer container and a flexible inner container.
Usually the commodity to be dispensed is introduced into the
inner container of such a dispenser. The annular chamber between
the inner container and the outer container is filled under pressure
with a propellent gas. Desirable objects to be achieved in the con-
struction of a dispenser of this type reside in avoiding the escape
of the pressurized gas introduced into the outer container and the
commodity introduced into the inner container. The intermixing of
the propellent gas and the commodity must also be avoided.
Many forms of these dispensers, also called two-chamber can-
isters or two-chamber pressure containers, are known. The chief
difference between them reside in the manner of securing and connect-
ing the inner and outer containers to the container cover and to thebase of a dispensing valve which is usually inserted into the top
opening of the outer container.
In one form, the top rim of the inner container is rolled over
between the outer container and the container cover. This ensures
satisfactory securing and sealing. However, the collapse of the
inner container during emptying and the consequential emptying of
the inner container dependent upon the collapsing of the inner con-
tainer are not satisfactory. In many cases the inner container is
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made from a plastics material. Thus, if the commodity which is
introduced into the inner container is of a kind which attacks metal,
it does not have any detrimental effect on the inner container.
However, the commodity also comes into contact with the container
cover and if the latter is made of metal, the dispenser cannot be
used for many commodities.
In another form of known dispenser, the rim of the inner
container is rolled over into the bottom of the outer container.
The propellent gas for extruding the commodity is then introduced
into the inner container. The commodity itself is introduced into
the annular chamber between the inner container and the outer con-
tainer. Thus, the commodity is in contact with the entire metal
casing forming the outer container. Thus, this form of dispenser
is unsuitable for all materials which attack metal.
In a third known form of dispenser, the inner container
is hooked into the top rolled over rim of the outer container.
A dispensing valve is mounted thereon by means of its base. The
rim of the said base is flanged and thus interconnects the
inner and outer containers, thus resulting in a leak-proof and
rigid connection. The commodity introduced into the inner
container doès not come into contact with the metal of the outer
container. In this known embodiment, the top rim of the pressure
container is rolled outwardly or is bent over. When inserting
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and pressing on the base of the dispensing valve, the inner container
is thus pressed against the conically outwardly extending rim strip
of the outer container. This pressure is effected directly below
the rolled rim. The inner and the outer containers are in contact
with one another along a strip zone, thus resulting in a surface
seal. This always leads to unreliable sealing. There is the risk
of cold flow within the locations where pressure has been exerted
when plastics material is used for the inner container. Thus, the
valve can become loose and the gas can escape from the outer con-
tainer. The cold-flowing of the plastics material can also cause
expansion of the flange rim of the base of the valve when there is
a high pressure in the outer container, and the valve becomes loose.
An object of the invention is to construct a device such
that the space in the inner container is satisfactorily sealed rela-
tive to the chamber between the inner container and the outer con-
tainer, and the valve is reliably prevented from becoming loose and
dropping out.
More particularly, in accordance with the invention, there
is provided, a dispenser for receiving and dispensing liquid and
pasty compositions under pressure comprising,
a pressure-resistant outer container having an upper rim,
~ flexible inner container having an upper rim which extends
right over the upper rim of the outer container,
a dispensing valve having a base which is received in
the mouth of said inner container, said valve base hav ng a rim
which overlies the rims of said inner and outer containers with
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the rim of the inner container extending beyond said valve base
rim,
a sharp acute angular sealing edge defined on the end
of the upper rim of said outer container and a further sharp
sealing edge defined on the end of the underside of said rolled
over valve base rim,
said valve base rim being crimped over to attach -the
outer and inner containers and the valve base to one another, and
said sealing edges each sealingly engaging said rim of
the inner container with line contact at both sides thereof.
With the outer container bent over inwardly, its sealing edge is
defined as a sharp inwardly projecting linear edge on the end of
the inwardly bent over rim. A sealing composition bead may be
provided between the rims of the outer and inner containers.
The sealing composition is in turn pressed downwardly by the
mounted base of the dispensing valve. As a result of this
pressure, the sealing composition is pressed and squeezed into the
open gap between the edge of the inner container and the top of
the bent over upper rim of the outer container. The sealing
composition is compressed by 20% to 30% of its original volume
by the bearing pressure, thus resulting in high sealing forces and
a reliable leak-proof closure.
Also described is a dispenser for receiving and
dispensing liquid and pasty compositions under pressure comprising
a pressure-resistant outer container; a flexible inner container
whose top rim overlies a bent over top rim of said outer container;
a dispensing valve having a base which is inserted into the mouth
of the inner container, said base having a rim which is rolled
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ovcr the upper rims of said inner and outer containers and thus
interconnects the inner and outer con~ainers and which defines
a sealing edge which is pressed radially inwardly against the rim
of the inner container; a closable opening in the bottom of the
outer container for the purpose of introducing a pressure medium
into the chamber between said containers; and a sealing composition
interposed between said rims.
In this structure, a sealing edge extends along the
outer edge of the base of the dispensing valve which presses the
overlaid rim of the inner container along a line radially against
the outside of the outer container.
With the top rim of the outer container bent over
inwardly to form a strip portion having a sealing edge which
abuts against the inner container, the sealing edge formed on
the strip portion of the outer container rim presses the inner
container radially inwardly against the flanged rim of the base
of the dispensing valve.
It has proved to be advantageous to interpose a sealing
composition between the walls of the outer container and the
inner container below the inwardly bent over rim strip portion
of the outèr container. This sealing composition is pressed on
and against the sealing edge between the inner container and the
rim strip portion by the pressure prevailing in the gas chamber
formed between the two containers.
In all dispensers, it is advantageous to interpose a
sealing composition between the bent over top rim of the outer
container and the rim of the inner container resting thereon.
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In accordance with ~n advantageous embodiment, the
base of the dispensing valve is curved radially outwardly at its
juncture with -the rolled over portion and in the region of the
edge of the outer container to form a bulge. Thus, the inner
container is pressed radially outwardly from the inside against
the edge of the outer container, thus producing large sealing
pressures at this edge.
Specific embodiments of the invention will now be
desçribed with reference to the accompanying drawings, in which:
Fig. 1 is a side elevation of one embodiment
of dispenser with the outer container and
the valve base shown in section.
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Fig. 2. is a section taken on the line II-II of Fig. 1.
Fig. 3. is a sectional detail drawn to a larger scale of
that part shown by the circle III in Fig. 1. and
Figs. 4, 5 and 6 are sectional details, similar to Fig. 3,
but illustrating three other embodiments.
Referring to Figs 1 and 2 an inner container 14, made from
plastics material, is located within a metal outer container 12.
A charging valve 16 for a propellent gas is located in the bottom
of the outer container 12. The inner container 14 is filled with
a liquid or pasty commodity to be dispensed before a dispensing
valve 32 is inserted by its base 26 into the upper open ends of
the containers.
In the seal illustrated in Fig. 3, the top rim 18 of the
outer container is bent inwardly. The rim of the outer container
is bent-over in the form of an internal chime to provide a strip
20 having a sealing edge 22. The dispensing valve 32 (Fig. 1) is
pressed into its base 26. The base of the dispensing valve is
bent upwardly along its rim 24 and is flanged downwardly and out-
wardly at 28. The base 26 is expanded outwardly in the lower
region of the rim 24 by means of an expansion tool to form a bulge
34. A sealing ring 30 rests on the end edge 36 of the inner con-
tainer 14 and on the inwardly bent rim 18 of the outer container 12.
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After assembly the propellent gas is introduced through the
charging valve 16 into the annular chamber between the inner
and outer containers 14 and 12 to place the commodity under
pressure.
The bulge 34 presses the inner container 14 firmly against
the strip 20 of the outer container 12. The sealing edge 22 of
the outer container is pressed into the plastics material of the
inner container 14. A bead of sealing composition 38 comprising,
for example, latex, is located between the inner container 14 and
the outer container 12 below the sealing edge 22. The sealing
composition is pressed against the two edges of the strip 20 by
the pressure in the gas chamber between the inner container 14
and the outer container 12. The gas chamber is thus additionally
sealed. The inner container 14, containing the commodity, is
sealed by the clamping of its top rim between the strip 20 of the
outer container 12 and the flanged rim 24 of the valve base.
Further sealing is effected along the end edge 36 of the inner
container. The sealing ring 30 is pressed against the end edge
by high pressures. As stated initially, the sealing ring 30 is
compressed by up to 30% of its volume. This leads to high seal-
ing forces along the end edge 36.
The structure illustrated in Fig. 4 differs from Fig. 3
in that the inner container 14 is drawn across the entire in-
wardly bent top rim 18 of the outer container 12. In this struc-
ture, a sealing edge 40 is formed along the downwardly facing rim
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42 of the bent-over rim of the valve base 26. The rim 42 presses
the inner container 14 radially inwardly against the outside of
the outer container 12 along the sealing edge 40.
In Fig. 5, the rim 18 of the outer container 12 is bent
outwardly to form an external chime. A further special feature
of this structure is that the flanged rim 24 of the base of the
dispensing valve is cylindrical. Thus, a sealing edge 44 is
produced at the transition between the flanged rim 24 and the
horizontally extending portion of the base 26. The pressure pre-
vailing in the gas chamber between the two containers presses theinner container 14 against the sealing edge 44. This produces
high sealing pressure at this location. A sealing composition can
also be provided at the location 38 of Fig. 3 for the purpose of
further sealing.
In Fig. 6; the top rim 20 of the outer container 12 is of
cylindrical conStruction and it is only below the cylindrical
portion that it merges into a diverging or convex region of
widening diameter. The sealing edge 44 is thus defined on the
outer container and extends along this transition. As in the
structures shown in Figs. 3 and 4, the flanged rim 24 of the base
26 of the dispensing valve curves radially outwardly. The inner
container 14 is thereby pressed against the sealing edge 44 on
the outer container 12.
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In Figs 5 and 6 the bent-over rim of the valve base 26
is turned right under the outwardly bent rim 18 of the outer
container so that a sealing edge 22 found on the rim of the
outer container and a sealing edge 40 found on the rim of the
valve base both engage the turned-over portion of the inner
container 14.
All the structures have the common feature that the inner
container 14 is pressed against a linear sealing edge. Refer-
ring to Figs. 3 and 4, this sealing edge extends along the
rim of the inwardly bent-over strip 20 of the outer container
and coincides with this rim. In Fig. 5, the sealing edge
extends along the transition between the flanged cylindrical
rim and the horizontally extending portion of the base of the
dispensing valve. The sealing edge is displaced radially
outwardly in Fig. 6 and i5 located on the inside of the outer
container. An additional sealing edge is produced along the
outer container. An additional sealing edge is produced
along the end edge 36 of the inner container 14 in Fig. 3. In
Figs. 4, 5 and 6 an additional sealing edge is produced along
the bottom rim 42 of the bent rim of the valve base. These
different sealing edges can, within the scope of the invention,
cooperate in different ways from those illustrated in detail.
