U.S. patent application number 09/827212 was filed with the patent office on 2001-08-09 for packaging and dispensing device including a vacuum-filled container, and a method of manufacture.
This patent application is currently assigned to L'OREAL. Invention is credited to Bailly, Christian.
Application Number | 20010011562 09/827212 |
Document ID | / |
Family ID | 9521606 |
Filed Date | 2001-08-09 |
United States Patent
Application |
20010011562 |
Kind Code |
A1 |
Bailly, Christian |
August 9, 2001 |
Packaging and dispensing device including a vacuum-filled
container, and a method of manufacture
Abstract
The invention relates to a device for packaging and dispensing
at least one fluid substance. The device has at least one container
filled with a substance by a vacuum-filling process, a pump
associated with the container and having a pump chamber into which
the substance is drawn prior to being delivered to the outside, and
anti-vacuum valve-forming means organized to isolate the pump
chamber(s) of the pump(s) from the inside(s) of the associated
container(s) when a vacuum is established therein for filling
purposes.
Inventors: |
Bailly, Christian; (Rungis,
FR) |
Correspondence
Address: |
OLIFF & BERRIDGE, PLC
P.O. Box 19928
Alexandria
VA
22320
US
|
Assignee: |
L'OREAL
|
Family ID: |
9521606 |
Appl. No.: |
09/827212 |
Filed: |
April 6, 2001 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
09827212 |
Apr 6, 2001 |
|
|
|
09220791 |
Dec 28, 1998 |
|
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Current U.S.
Class: |
141/2 ; 141/18;
222/321.9 |
Current CPC
Class: |
B05B 11/0056 20130101;
B05B 11/0097 20130101; B05B 11/00416 20180801; B05B 11/3067
20130101; B05B 11/3047 20130101; B05B 11/0078 20130101; B05B
11/00412 20180801 |
Class at
Publication: |
141/2 ;
222/321.9; 141/18 |
International
Class: |
B65B 001/04 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 8, 1998 |
FR |
98 00134 |
Claims
1. A method of filling a container with a substance to be dispensed
with a pump, the pump having a pump chamber, the method comprising:
introducing the substance into the container equipped with the
pump, the pump chamber being, during the filling of the container,
maintained at a pressure higher than the pressure in the
container.
2. A method according to claim 1, wherein the container is filled
under vacuum.
3. A method according to claim 1, wherein the pump chamber is
maintained, during the filling of the container, at a pressure
higher than the pressure in the container by using a one way valve
capable of isolating the pump chamber from the container in a
closed position.
4. A method according to claim 1, wherein the pump is fixed at a
first end of the container and the container is filled through a
second end of the container, the second end being opposed to the
first end.
5. A method according to claim 1, wherein a pushbutton forming
endpiece is fitted to a control rod of the pump after filling of
the container.
6. A method according to claim 3, wherein the one way valve is
manufactured separately from the pump.
7. A method according to claim 3, wherein the one way valve is
manufactured with the pump.
8. A method according to claim 7, wherein the one way valve is
integral with the pump.
9. A method according to claim 1, wherein a one way inlet valve is
mounted on the pump prior to filling of the container, the one way
inlet valve isolating from the container, in a closed position, a
one way valve of the pump through which substance is drawn in the
pump chamber.
10. A method according to claim 5, wherein the fitting of the
endpiece is accompanied by the control rod being pushed into the
pump.
11. A method according to claim 1, wherein the method comprises
mounting on the pump, prior to filling the container, a one way
inlet valve capable of isolating, in the pump, prior to filing the
container, a one way inlet valve capable of isolating, in a closed
position, the pump from the container.
12. A method according to claim 11, wherein the mounting comprises
the step of snapping on the pump a support of the one way inlet
valve.
13. A method according to claim 1, wherein the method further
comprises the step of mounting the pump, prior to filling the
container, on a support fixed on the container.
14. A method according to claim 1, wherein the method comprises the
step of establishing a vacuum in the container for filling purposes
and subjecting the pump to vacuum.
15. A method according to claim 1, wherein the method comprises the
step of isolating the pump chamber from the container during the
filling of the container using a one way inlet valve comprising a
valve member made of elastomer material.
16. A method according to claim 1, wherein the method comprises the
step of mounting on the container the pump, the pump comprising a
one way inlet valve through which the substance is drawn in the
pump chamber, the one way inlet valve comprising a valve member
constituted by a ball, wherein the method further comprises the
step of isolating the one way inlet valve from the container using
a further one way inlet valve upstream of the pump.
17. A method of manufacturing a packaging and dispenser device
having two containers for separately containing respective
substances, and two pumps respectively associated with the
containers for dispensing the substances simultaneously, each of
the pumps having a pump chamber into which, during operation of the
pump, the substance is drawn prior to being delivered to the
outside, the method comprising the steps of: assembling each pump
fitted with valve-forming means to the associated container, the
valve-forming means being capable of isolating in a closed position
the pump chamber from the container; filling each container
separately by a vacuum-filling process; inserting both pumps and
the associated containers in a case; and fitting the case with a
dispenser endpiece common to both pumps.
18. A method of manufacturing a device for packaging and dispensing
at least one fluid substance, the device having at least one
container for containing a substance and a pump for dispensing the
substance, the pump having a pump chamber into which, in operation
of the pump, the substance is drawn prior to being delivered to the
outside, the method comprising the steps of: assembling together
the pump, the container, and valve-forming means, the container
being suitable for communicating with the pump chamber via the
valve-forming means; evacuating the container via an opening
thereof, the valve-forming means isolating the pump chamber from
the container during the evaluation step; filling the container by
causing it to communicate via the opening with a source of
substance; and closing the opening.
Description
[0001] The present invention relates to a device for packaging and
dispensing at least one fluid substance.
BACKGROUND OF THE INVENTION
[0002] Devices are known for packaging and dispensing a fluid
substance that comprise a container for containing said substance
and an associated pump, the pump having a pump chamber into which
the substance is taken before being delivered to the outside.
[0003] The pump has intake valve-forming means and delivery
valve-forming means, respectively upstream and downstream from the
pump chamber. The pressure required for expelling the substance
from the device is obtained by means of a control rod that is
movable in the pump chamber. A dispenser endpiece, such as a
pushbutton fitted with a nozzle, is fixed to the control rod before
the container is filled.
[0004] When a user presses on the dispenser endpiece, the control
rod is pressed down into the pump body and reduces the volume of
the pump chamber, causing a predetermined quantity of substance to
be dispensed.
[0005] When the user releases the dispenser endpiece, the control
rod is returned to its initial position by a spring. This return
movement of the control rod is accompanied by an increase in the
volume of the pump chamber. The delivery valve-forming means are
organized to prevent substance contained in the dispenser endpiece
from returning back into the pump chamber, and also to prevent air
penetrating therein. The intake valve-forming means open while the
control rod is returning so as to enable substance contained in the
container to be drawn into the pump chamber.
[0006] The container can be constituted by a deformable flexible
bag which shrinks as the substance is dispensed, or in a variant it
may be formed by a cylindrical wall fitted with a moving bottom,
e.g. constituted by a piston capable of sliding therein, or in a
variant constituted by a membrane which deforms to occupy the space
left empty inside the container by the substance which has been
dispensed.
[0007] In known packaging and dispensing devices as outlined above,
the container can be filled by a vacuum-filling process consisting
in establishing suction in the container and then in putting the
container into communication with a source of substance so that the
substance is drawn into the container.
[0008] Such a filling process has the particular advantages of
making high throughout possible during production and of avoiding
the substance oxidizing on coming into contact with air.
[0009] The dispenser endpiece is mounted on the control rod by
forcing the control rod into an appropriate housing in the
dispenser endpiece, with the control rod is pushed into the pump
body until it comes into abutment at the end of a push-in
stroke.
[0010] Tests have shown that when the dispenser endpiece is mounted
on the control rod after the container has been vacuum-filled,
pushing in the control rod causes a certain quantity of substance
to be expelled, giving rise to dirtying and also running the risk
of causing substance contained in the outlet channel of the
dispenser endpiece to become degraded on contact with air, and
possibly even to the outlet channel becoming blocked once the
substance has dried.
[0011] There also exists a need for packaging and dispensing
devices that have two independent containers and two pumps for
simultaneously dispensing two substances that are stored separately
in each of the containers.
[0012] Mounting a common dispenser endpiece on the control rods of
the two pumps after the containers have been vacuum-filled would
give rise to the above-mentioned drawbacks, while mounting the
dispenser endpiece before the containers are filled makes the
device more complicated to manufacture.
OBJECTS AND SUMMARY OF THE INVENTION
[0013] The present invention seeks in particular to enable the
dispenser endpiece to be mounted on the control rod(s) of the
pump(s) after vacuum-filling the container(s), but without the
drawbacks mentioned above.
[0014] According to the invention, this is achieved by the fact
that the packaging and dispensing device includes anti-vacuum
valve-forming means organized to isolate the pump chamber(s) of the
pump(s) from the inside(s) of the associated container(s) when a
vacuum is established therein for filling purposes.
[0015] Thus, by means of the invention, a vacuum is not established
in the pump chamber when the air initially present in the
associated container is drawn out, such that when the container is
put into communication with the source of substance, only the
container is filled and not the pump chamber.
[0016] As a result, when the dispenser endpiece is subsequently
fixed on the control rod(s) and the control rod(s) is/are pushed
into the pump body(ies), no substance flows out through the
dispenser endpiece.
[0017] By means of the invention, the dispenser endpiece therefore
remains substantially free of substance during storage, and any
risk of dirtying, degradation, or drying of the substance is
avoided.
[0018] In other words, the invention makes it possible to avoid
untimely dispensing of a small quantity of substance when the
dispenser endpiece is put into place on the control rod(s).
[0019] The invention makes it possible in particular to mount two
pumps each fitted with a respective container constituted by a
flexible bag inside a case, and then fitting a cover on the case to
serve both as an actuator for the pump control rods and to dispense
the mixture of substances contained in the containers.
[0020] The invention is also advantageous when the dispenser
endpiece is already fixed on a control rod before the container is
filled.
[0021] Under such circumstances, any accidental thrust on the
dispenser endpiece is then avoided during boxing or transportation,
for example, so no substance flows out from the dispenser
endpiece.
[0022] In known pumps, the intake valve-forming means are
constituted by a ball, which therefore provides sealing only when
the pump is used in a predetermined position, e.g. head-up.
[0023] The anti-vacuum valve-forming means of the invention are
preferably capable of providing sealed closure in any position,
thereby increasing the number of ways in which the pump can be
used.
[0024] In a particular embodiment, the anti-vacuum valve-forming
means form an integral portion of the pump and also act as the
intake valve, enabling the substance contained in the container to
be drawn into the pump chamber while preventing it from returning
when the control rod is pushed in.
[0025] In a variant embodiment, the anti-vacuum valve-forming means
are fitted to the pump which is manufactured separately and may be
constituted by a prior art pump that is unmodified or that has been
subjected to modifications that are minor and not expensive.
[0026] By way of example, the pump can be of the type having a
valve that is constituted by a ball and/or a control rod engaged
with a return spring.
[0027] In another embodiment, the anti-vacuum valve-forming means
comprise a support piece secured to the container with the pump
being fixed thereto.
[0028] In another variant, the anti-vacuum valve-forming means are
secured to the container.
[0029] The invention also provides a method of manufacturing a
device for packaging and dispensing at least one fluid substance,
said device having at least one container for containing a
substance and a pump for dispensing it, the pump having a pump
chamber into which, in operation of the pump, the substance is
drawn prior to being delivered to the outside, the method
comprising the steps consisting in:
[0030] assembling together the pump, the container, and anti-vacuum
valve-forming means, the container being suitable for communicating
via a first opening with the pump chamber via the anti-vacuum
valve-forming means;
[0031] evacuating the inside of the container via a second opening
thereof, the anti-vacuum valve-forming means isolating the
container from the pump chamber during the evacuation step;
[0032] filling the container by causing it to communicate via said
second opening with a source of substance; and
[0033] closing said second opening.
[0034] The invention also provides a method of manufacturing a
packaging and dispenser device having two containers for separately
containing respective substances, and two pumps respectively
associated with said containers for dispensing said substances
simultaneously, each of the pumps having a pump chamber into which,
during operation of the pump, the substance is drawn prior to being
delivered to the outside, the method comprising the steps
consisting in:
[0035] assembling each pump fitted with anti-vacuum valve-forming
means to the associated container;
[0036] filling each container separately by a vacuum-filling
process;
[0037] inserting both pumps and the associated containers in a
case; and
[0038] fitting the case with a dispenser endpiece common to both
pumps.
BRIEF DESCRIPTION OF THE DRAWINGS
[0039] Other characteristics and advantages of the present
invention appear on reading the following detailed description of
non-limiting embodiments of the invention, and on examining the
accompanying drawings, in which:
[0040] FIGS. 1 and 2 are diagrams showing a prior art packaging and
dispensing device;
[0041] FIG. 3 is a diagrammatic axial section view of a pump
constituting a first embodiment of the invention;
[0042] FIGS. 4 to 7 show various steps in the vacuum-filling
process followed by installation of the dispenser endpiece on the
control rod of the pump;
[0043] FIG. 8 is a fragmentary and diagrammatic axial section of a
variant embodiment;
[0044] FIG. 9 shows another variant embodiment;
[0045] FIG. 10 shows another embodiment of the anti-vacuum
valve-forming means;
[0046] FIG. 11 shows another embodiment of the invention;
[0047] FIGS. 12 to 18 show the process of filling and closing a
flexible bag constituting a container; and
[0048] FIG. 19 is a diagrammatic fragmentary section view of a
packaging and dispensing device constituting a last embodiment of
the invention.
MORE DETAILED DESCRIPTION
[0049] FIG. 1 shows a prior art packaging and dispensing device
1.
[0050] The device 1 comprises a container constituted by a
cylindrical-walled container 2 fitted with a moving bottom
constituted by a piston 3 that slides in sealed manner inside the
wall 2.
[0051] The container 2 has a neck 4 at its top end on which there
is fixed a pump 5 which is shown in section in FIG. 2.
[0052] The pump 5 comprises a pump body 6 constituted by
snap-fastening together a top portion 6a and a bottom portion
6b.
[0053] A control rod 8 is mounted so that its bottom portion slides
inside the body 6 against the action of a return spring 9 that
operates in compression, one end of the spring 9 bearing against a
shoulder 10 at the bottom of the bottom portion 6b of the body 6,
and its other end bearing against a shoulder 8a on an endpiece 8b
fixed to the bottom end of the control rod 8.
[0054] The top portion 6a has a flange 18 serving to mount the pump
5 together with a sealing ring 14 situated beneath the flange for
sealed fixing to the container, with mounting being provided by a
metal ring 7 that can be crimped to the neck 4 of the container
2.
[0055] The control rod 8 has an axial bore 8d extending from above
the endpiece 8e to the top end of the rod.
[0056] A dispenser endpiece 19 serving both as an actuator member
and as a nozzle is a force-fit on the top end of the control rod
8.
[0057] A piston 11 is mounted around the control rod 8 inside the
bottom portion 6b of the body 6.
[0058] The piston 11 slides in contact simultaneously with the
bottom portion 6b and with the control rod 8, and has an inside
shoulder 11a against which there bears a shoulder 8b of the control
rod 8 after it has been pushed in a short distance.
[0059] The bottom portion of the piston 11 has a skirt 11b against
which the endpiece 8e of the control rod 8 bears at rest, i.e. when
it comes into abutment via a shoulder 8f situated above the piston
11 engaging a narrowing 17 of the top portion 6a.
[0060] The control rod 8 has radial holes 8c communicating with the
axial bore 8d at its bottom end and enabling substance to be
conveyed to the dispenser endpiece 19.
[0061] The bottom portion 6b serves as a seat for a ball 13 which,
at rest, closes an orifice 26.
[0062] The piston 11 and the ball 13 define a pump chamber 12
inside the body 6.
[0063] When the control rod 8 is at rest, the holes 8c are closed
by the skirt 11b of the piston 11.
[0064] When the user presses on the dispenser endpiece 19, the
control rod 8 is pushed into the body 6.
[0065] At the beginning of the push stroke of the control rod 8,
the piston 11 is not driven by the control rod 8 so long as the
shoulder 8b has not come into abutment against the shoulder 11a of
the piston 11.
[0066] The control rod 8 thus moves relative to the piston 11 and
the endpiece 8e ceases to bear against the skirt 11b.
[0067] The holes 8c then communicate with the pump chamber 12 via
the gap which exists between the control rod 8 and the bottom edge
of the skirt 11b.
[0068] As the push stroke of the control rod 8 continues, the
shoulder 8b comes to bear against the shoulder 11a and the piston
11 is moved downwards together with the control rod 8.
[0069] The substance is then expelled from the pump chamber 12 by
the movement of the piston 11 and it passes into the axial bore 8d
via the holes 8c in order to be dispensed.
[0070] While the control rod 8 is moving downwards, the ball 13
remains pressed against its seat in the bottom of the bottom
portion 6b of the body 6, and prevents any substance being returned
to the container.
[0071] When the user releases the dispenser endpiece 19, the
control rod 8 initially slides within the piston 11 until its
endpiece 8e comes to bear against the bottom edge of the skirt
11b.
[0072] The axial bore 8d is then isolated from the pump chamber 12,
and continued upwards movement of the control rod 8 under drive
from the spring 9 generates suction in the pump chamber 12, which
is accompanied by the ball 13 lifting and substance coming in from
the container.
[0073] The inventors have found that with known pumps, if a vacuum
is formed in the container prior to the container being filled,
then the ball 13 does not close off the pump chamber 12 with
sufficient sealing, such that the air present therein is sucked
into the container.
[0074] In particular, if the container is filled while head-down,
the ball 13 leaves its seat under gravity and is completely
incapable of isolating the pump chamber 12.
[0075] As a result, when the container at low pressure is put into
communication with the source of substance for filling purposes,
some substance is also drawn into the pump chamber 12 because of
the suction present therein.
[0076] The invention seeks to remedy that drawback.
[0077] FIG. 3 is a diagrammatic axial section showing a first
embodiment of a pump of the invention, which pump is given
reference 22 and differs from above-described pump 5 in that the
bottom portion of the pump body, now referenced 6b', has an
external annular groove 28, and in that it is provided with an
anti-vacuum valve 23 secured to a support piece 24 which in turn is
snap-fastened in the groove 28.
[0078] The anti-vacuum valve 23 is specially designed to prevent
the air initially present in the pump chamber 12 from being drawn
out when the container is evacuated for filling purposes.
[0079] In the example shown, the anti-vacuum valve 23 is made of
elastomer material, being overmolded on the support piece 24 or, in
a variant, being made by dual injection therewith.
[0080] The support piece 24 is pierced by an orifice 25 which, at
rest, is closed by the anti-vacuum valve 23, and which when the
control rod 8 rises, allows the substance to reach the orifice
26.
[0081] The orifice 25 is closed by the valve 23 with the necessary
amount of sealing, even when the container is head-down and has
suction established therein.
[0082] Although the pump 22 is shown as having a ball 13, the ball
13 could be omitted, in which case the valve 23 would also act as
the intake valve.
[0083] With reference to FIGS. 4 to 7, there follows a description
of the various steps in the process whereby the container is
vacuum-filled, and also of the process whereby the dispenser
endpiece is put into place on the control rod.
[0084] Initially, as shown in FIG. 4, the container 2 is placed
upside-down, and then the head T of a vacuum-filler is applied in
sealed manner against the bottom of the container 2.
[0085] Air is then sucked out therefrom via a channel through the
head T.
[0086] While a vacuum is being established inside the container 2,
the valve 23 is pressed firmly against its seat on the support
piece 24 and prevents the air contained in the pump chamber 12 from
escaping.
[0087] The vacuum established in the container 2 is relative only,
and it suffices in the invention for filling to take place under a
pressure that is lower than atmospheric pressure.
[0088] Thereafter, as shown in FIG. 5, the inside of the container
2 is put into communication with a source of substance P, and the
substance passes through the head T into the inside of the
container, as shown in FIG. 5.
[0089] Since the pump chamber 12 is not at reduced pressure, no
substance is sucked into it.
[0090] Once the container 2 has been filled, the moving bottom
constituted by the piston 3 is put into place, as shown in FIG.
6.
[0091] Thereafter, the container 2 is turned the right way up and
the endpiece 19 can be fixed on the control rod 8, as shown in FIG.
7.
[0092] Although the control rod 8 is pushed in while the endpiece
19 is being put into place therein, no substance is caused to
escape because the pump chamber 12 does not contain any.
[0093] In the embodiment described above, the anti-vacuum valve 23
is added to the pump, and the pump differs from known pumps only in
a minor modification consisting in providing the groove 28.
[0094] In the variant embodiment shown in FIG. 8, the anti-vacuum
valve, now referenced 30, is an integral part of the pump, being
overmolded on the body thereof, referenced 31, or being made by
dual injection therewith.
[0095] The anti-vacuum valve 30 replaces the ball 13 of the
above-described pump 5 and provides the pump with better sealing
against the vacuum created in the container prior to being filled.
The remainder of the pump is similar.
[0096] Once the container has been filled, the valve 30 acts in the
same manner as the ball 13 enabling substance to penetrate into the
pump chamber 12 while the control rod is rising and preventing
substance from being returned to the container while the user is
pushing down the dispenser endpiece 19.
[0097] In another variant, shown in FIG. 9, the anti-vacuum valve,
now referenced 35, is made on an independent support piece 36.
[0098] The pump, now referenced 37, is fixed to the support piece
36.
[0099] The pump 37 is identical to the pump 5 shown in FIG. 2
except that it does not have a sealing ring 14, the flange 18 of
the top portion 6a of the pump body resting directly against an
intermediate piece 38, against which the pump is held by crimping
the ring 7.
[0100] The top portion of the intermediate piece 38 has a flange
38a which bears against the flange 18 and which has a bottom skirt
38b extending concentrically around the bottom portion 6b of the
pump body.
[0101] The support piece 36 has a sealing skirt 36a shaped to bear
in sealed manner against the bottom portion 6b of the pump body, in
the annular space that exists between said bottom portion 6b and
the skirt 38b.
[0102] The support piece 36 also has a skirt 36b serving for fixing
the intermediate piece 38, and provided with an annular groove 36c
in which a bead 38c formed on the radially outer surface of the
skirt 38b is snap-fastened.
[0103] Finally, the support piece 36 has an outer skirt 36d
provided at its top end with a rim 36e, said skirt 36d being
designed to fix the assembly to a case and also serving for fixing
to a deformable flexible bag 40 acting as the container.
[0104] The anti-vacuum valve 35 is made by overmolding in a housing
41 of the support piece 36, which housing opens out to the inside
of the sealing skirt 36a beneath the orifice 26 of the pump.
[0105] The anti-vacuum valve 35 has a fixed portion 35a fixed to
the side wall of the housing 41, and a moving portion 35b connected
to the fixed portion via a hinge-forming bridge of material 35c,
the moving portion 35b being capable of being lifted to allow
substance to pass towards the pump 37. At rest, the moving portion
35b closes the orifice provided in the bottom of the housing
41.
[0106] In a variant, the anti-vacuum valve could equally well be
made on a support piece 45 used only for fixing a container-forming
bag 46, as shown in FIG. 10.
[0107] In axial section, this support piece 45 is generally
U-shaped, with a central orifice 47 being provided in the bottom
thereof.
[0108] The anti-vacuum valve, now referenced 48, is fixed to the
support piece 45 in such a manner as to close the orifice 47 when a
vacuum is established in the bag 46.
[0109] The bag 46 is fixed by any known means to the outside
surface of the side wall 49 of the support piece 45, e.g. by
ultrasonic bonding.
[0110] The side wall 49 extends radially outwards at its top end to
form a collar enabling it to be fixed inside a case carrying, above
the support piece 45, the pump used for extracting the substance
contained in the bag.
[0111] The invention also applies to a pump as shown in FIG. 11 and
referenced 60.
[0112] This pump 60 has a delivery valve 61 formed at the outside
end of the outlet channel of the dispenser endpiece 62.
[0113] The dispenser endpiece 62 is integrally formed with the
control rod, which control rod is double-walled.
[0114] The pump body, now referenced 65, has a circularly
cylindrical central wall 70 which is extended outwards at its
bottom end to form an upwardly-open U-shaped groove serving as a
guide in which the double-wall of the dispenser endpiece 62
slides.
[0115] The radially-outer wall 67 slides in contact with the
radially-outer wall 68 of the body 65 while the radially-inner wall
69 slides in contact with the wall 70.
[0116] This wall extends upwards in narrowed form so as to define
an orifice 71 at its top end, which orifice is closed by a valve 63
when the dispenser endpiece 62 is pressed down into the body
65.
[0117] A sealing ring 72 is made at the periphery of the valve 63
to ensure that the wall 69 slides in sealed manner over the wall
70.
[0118] An annular groove 73 is formed on the radially-inner surface
of the wall 68 to retain portions in relief 74 projecting radially
outwards from the wall 67 and to limit the up stroke of the
dispenser endpiece.
[0119] A compression spring 75 has one end bearing against the end
wall of the groove formed between the walls 67 and 69, and has its
other end bearing against the end wall of the groove formed between
the walls 68 and 70.
[0120] In this case, the pump chamber is constituted by the channel
inside the dispenser endpiece 62, the outside end of this channel
being defined by the valve 61 and the inside end thereof by the
valve 63.
[0121] A deformable bag 77 is fixed to the radially-outer surface
of the wall 68.
[0122] In a variant, the pump 60 is fixed by minor modifications to
the body 65 to a container 2 having a moving bottom, as described
above.
[0123] In known pumps, the intake valve 63 is not designed to
provide sealing against a vacuum.
[0124] In the invention, an anti-vacuum valve 80 carried by a
support piece 81 is secured to the body 65 by any means known to
the person skilled in the art.
[0125] FIGS. 12 to 18 show how a container-forming flexible bag is
filled and closed.
[0126] The flexible bag, referenced 90, is initially fixed onto a
support or a pump, provided with an anti-vacuum valve of the
invention.
[0127] The assembly is supported by a retaining device 91 on which
there is applied a bell 92 through which there passes a filler
nozzle 93.
[0128] The bell 92 is provided with means 94 that are shown in part
only and that serve to control the low pressure that obtains
therein.
[0129] The pressure inside the bell 92 is reduced by sucking out
the air contained therein, said air leaving the bottom of the
device 91 via a duct 95.
[0130] The bag 90 has an open bottom 96 that is upwardly directed,
as shown in FIG. 12.
[0131] Once suction has been established inside the bell 92, the
substance P is delivered via the nozzle 93. The bell 92 and the
holding device 91 move down relative to the nozzle while the level
of substance P in the bag 90 rises, as shown in FIG. 13, so that
the bottom end of the nozzle 93 is maintained above the level of
substance in the bag.
[0132] The bell 92 is kept under suction throughout the time
required for filling.
[0133] At the end of filling, as shown in FIG. 14, the nozzle 93 is
situated outside the bag, and the vacuum is broken by allowing air
to enter via the duct 95.
[0134] Thereafter, the bell 92 is removed and the full bag 90 is
taken to a closure station provided with a device 97 for pinching
together and sealing the walls of the bag, as shown in FIG. 15.
[0135] The bottom 96 of the bag is pinched together and sealed in
two locations one above the other, as shown in FIGS. 16 and 17, and
then the portion of the bag that exists between the two lines of
sealing is cut off, as shown in FIG. 18.
[0136] The invention is advantageously implemented to provide a
device for packaging and dispensing, as shown in FIG. 19, having
two pumps like the pumps 37 described with reference to FIG. 9,
each pump having its own anti-vacuum valve and being associated
with a respective flexible bag 40 forming a container, both bags
being placed inside a common case 100.
[0137] Each bag 40 is individually filled by the method described
with reference to FIGS. 12 to 18.
[0138] Once both pumps 37 have been put into place in the case 100,
a common dispenser endpiece 101 is put into place on the control
rods 8.
[0139] The dispenser endpiece 101 has two housings 102 and 103
which fit over the ends of the control rods 8 and which communicate
with a common outlet nozzle that is not shown in order to clarify
the drawing.
* * * * *