U.S. patent number 3,893,596 [Application Number 05/445,734] was granted by the patent office on 1975-07-08 for upright-inverted aerosol dispenser.
This patent grant is currently assigned to VCA Corporation. Invention is credited to Steven W. Beres, James L. Gentile.
United States Patent |
3,893,596 |
Beres , et al. |
July 8, 1975 |
Upright-inverted aerosol dispenser
Abstract
An aerosol dispenser of the hand-held type adapted to discharge
fluid under pressure when held in either an upright or an inverted
position. The dispenser comprises a can or container, an actuator
valve carried thereby and a special dip tube assembly including
concentric inner and outer tubes defining an annular channel
therebetween. The inner dip tube at one end is carried on a hollow
depending boss which communicates with the interior of the valve
housing. The outer dip tube is similarly carried at one end, but on
a larger diameter, notched portion of the housing, the notches
providing communication between the annular channel and the upper
interior of the can adjacent the valve. The other end of the outer
dip tube carries a gravity-operated check valve. The arrangement is
such that when the container is in the upright position, the check
valve is open whereby the inner dip tube can receive fluid directly
from the lower part of the container to be discharged through the
actuator valve. In the inverted position, the check valve closes to
prevent the propellant gas in the container from escaping. Fluid is
then drawn past the notches in the housing and into the annular
channel. It thereafter enters the inner dip tube and is discharged
through the actuator valve.
Inventors: |
Beres; Steven W. (Bridgeport,
CT), Gentile; James L. (Bridgeport, CT) |
Assignee: |
VCA Corporation (Greenwich,
CT)
|
Family
ID: |
23769999 |
Appl.
No.: |
05/445,734 |
Filed: |
February 25, 1974 |
Current U.S.
Class: |
222/402.19 |
Current CPC
Class: |
B65D
83/565 (20150701); B65D 83/36 (20130101); B65D
83/32 (20130101) |
Current International
Class: |
B65D
83/14 (20060101); B65d 083/14 () |
Field of
Search: |
;222/402.19,376,402.18 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Tollberg; Stanley H.
Assistant Examiner: Lane; Hadd
Attorney, Agent or Firm: Lehmann; H. Gibner Lehmann; K.
Gibner Mays; E. Donald
Claims
We claim:
1. An aerosol dispenser of the hand-held type, comprising in
combination:
a. a container and dispensing valve carried at the top thereof for
controlling the discharge of its contents,
b. an outer dip tube,
c. means connecting one end of said outer dip tube to said
dispensing valve,
d. an inner dip tube freely disposed inside said outer dip tube,
connected at one end to and communicating with said dispensing
valve,
e. said dip tubes being coextensive and having spaced-apart annular
wall portions defining an annular channel therebetween,
f. a check valve connected to the other end of said outer dip tube
and having a port communicating with said annular channel,
g. said check valve being disposed adjacent the other end of said
inner dip tube,
h. said check valve having a gravity actuated valve part which
moves in response to tilting of the container to upright and
inverted positions respectively,
i. that end of said inner dip tube which is adjacent the check
valve being free from and unattached to said check valve,
j. said dispensing valve having means thereon enabling
communication to be had between the annular channel defined by the
dip tubes and the upper area in the container, and
k. said check valve closing off said other end of said outer dip
tube when the container is in an inverted position and opening said
other end when the container is upright.
2. The invention as defined in claim 1, wherein:
a. said dispensing valve comprises a valve housing and a valve stem
movably carried therein,
b. said valve housing having a plurality of longitudinal grooves in
its outer wall,
c. said one end of said outer dip tube being received over the
lower portion of said valve housing, and
d. said grooves and the walls of said outer dip tube defining
passages providing communication between the annular channel and
the upper area in the container.
3. The invention as defined in claim 1, wherein:
a. said dispensing valve comprises a valve housing and a valve stem
movably carried therein,
b. said valve housing having a hollow depending boss,
c. said inner dip tube being press-fitted onto said boss and
forming a tight seal therewith.
Description
BACKGROUND
This invention relates generally to small aerosol dispensers of the
hand-held type, and more particularly to dispensers adapted to
operate in either an upright or an inverted position. In the past,
a number of different arrangements have been proposed and
constructed to accomplish this. U.S. Pat. No. 3,545,488 discloses a
dispenser of the type having a first dip tube connected to the
actuator valve, a check valve connected with the free end of the
first tube, and an additional dip tube carried at one end by the
check valve and having its free end disposed adjacent the closure
dome of the container.
An alternate embodiment (FIG. 7) discloses a single dip tube which
has coextensive passages which are isolated from one another, one
of which has a circular cross sectional configuration and the other
of which has crescent-shaped cross sectional configuration.
While these constructions operated in a generally satisfactory
manner, several disadvantages were apparent with each.
Specifically, in the constructions of the above identified patent,
the free end of the second dip tube did not always occupy a
position below the level of the fluid when the container was
disposed in a horizontal position. The use of a weighted check
valve to orient the free end of the second dip tube to a position
below the level of fluid in a tilted container constituted a
somewhat less than satisfactory solution to such a problem. Where a
single dip tube having separate coextensive channels was employed,
the manufacturing costs went up, since extruded tubing of this
nature was inherently more expensive to produce than conventional
tubing. In addition, where such specially molded tubing was
connected to valve housing, the latter had to be provided with
identically molded ports.
SUMMARY
The above disadvantages and drawbacks of prior aerosol dispensers
of the upright-inverted type are obviated by the present invention
which has for its object the provision of a novel and improved
dispenser of the kind indicated which is extremely simple in
construction, effective in operation and economical to manufacture,
assemble and produce. A related object is the provision of a
dispenser as above characterized which is constituted of few
separate pieces and which can employ simple molded parts and
readily available inexpensive extruded plastic tubing requiring no
special tooling or special fabrication equipment.
The above objects are accomplished by the provision of an aerosol
dispenser comprising a pressurized container and actuator valve
carried thereby, and a special dip tube assembly connected with the
valve to enable discharge of the contents of the dispenser from
either an upright or an inverted position. The dip tube assembly
comprises inner and outer dip tubes, the latter carrying a check
valve at one end. The tubes are generally concentric, and the end
of the inner dip tube adjacent the check valve is free and
unattached. The other end of the inner dip tube is carried on a
depending nipple on the valve housing so as to communicate with the
interior thereof. The tubes thus define an annular channel, and
this communicates with the interior of the container at a location
adjacent the actuator valve. The arrangement is such that when the
container is upright, the check valve is open and fluid from the
bottom of the dispenser can enter the inner dip tube through the
check valve to thereby be discharged through the actuator valve.
When the dispenser is inverted, the check valve closes, thus
preventing escape of the propellant gas. Fluid from the top of the
inverted container enters the annular channel, and from there is
discharged through the inner dip tube. The provision of concentric
dip tubes and a simple check-valve pressed into the bottom end of
one constitutes an extremely simple and effective construction
which has the important advantage of low tooling and assembly
cost.
Other features and advantages will hereinafter appear.
In the drawings, illustrating a preferred embodiment of the
invention:
FIG. 1 is a vertical sectional view of the improved aerosol
dispenser of the present invention, shown in an upright
position.
FIG. 2 is a view like that of FIG. 1, except showing the depress
button and valve being actuated to effect discharge of the
dispenser contents.
FIG. 3 is a vertical sectional view of the improved aerosol
dispenser of the present invention, shown in an inverted
position.
FIG. 4 is a bottom plan view of the ball check valve part of FIGS.
1-3.
FIG. 5 is a top plan view of the ball check valve part of FIGS.
1-3.
FIG. 6 is a section taken on line 6--6 of FIG. 1.
FIG. 7 is a section taken on line 7--7 of FIG. 1.
Referring to FIGS. 1-3 there is illustrated an aerosol dispenser of
the hand-held type generally designated by the numeral 10,
comprising a container 12 having a top closure member 14 with an
inverted cup portion 16 carrying a valve housing 18. A valve stem
20 extends through an opening 22 in the cup portion 16 and has an
annular valve shoulder 24 which engages a valve seat 26 all in the
usual manner. A spring 28 disposed in the valve housing 18 biases
the stem 20 against the seat 26. The housing, stem, spring and seat
constitute an actuator valve, hereinafter also referred to as a
dispensing valve. The stem is further provided with a hollow bore
30 and a transverse passage 32 which provides communication between
the valve housing 18 and the discharge nozzle 34 of a depress
button 36. The valve housing is retained in the cup portion 16 by a
crimped bead 38, and the closure member 14 is held in place on the
container by a crimp 40.
Referring to FIG. 1 and in accordance with the present invention
there is provided a novel and improved dip tube and check valve
assembly for enabling discharge of the contents of the dispenser
from either an upright or an inverted position. The assembly
comprises an outer dip tube 42 and an inner dip tube 44 which is
substantially concentric with and coextensive with the first (FIG.
7). The two tubes thus define an annular channel 46 therebetween.
The outer dip tube 42 is pressed onto a large diameter portion 48
of the valve housing, the latter constituting mounting means
therefor. This portion 48 has a plurality of notches or recesses 50
(FIG. 6) which define passages providing communication between the
annular channel 46 and an area of the interior of the container
adjacent the cup portion 16. The inner dip tube 44 engages a smooth
annular external surface of a depending nipple 19 on the valve
housing to form a substantially tight seal therewith.
As shown in FIGS. 1-3, the free end of the outer dip tube 42
carries a check valve 52 which is press-fitted therein. The valve
52 includes an annular valve casing 54 having a hollow bore 56 and
inlet and outlet ports 58, 60, respectively. The valve casing 54 is
particularly illustrated in FIGS. 4 and 5. A ball 62 constituting a
movable valve part is held captive in the casting. Adjacent one end
of the casing is an annular valve seat 64 which is engaged by the
ball when the container is in the inverted position of FIG. 3.
Under these circumstances, the port 60 is closed off. When the
container is upright, the ball assumes the position shown in FIGS.
1 and 2 wherein it engages a plurality of detent nibs 65, the
latter serving to maintain the ball captive. A plurality of
longitudinal slots 66 in the casing 54 provide communication
between the bore 56 and an area of the container adjacent its
bottom. An annular shoulder 68 on the valve casing seats against
the end of the dip tube 42 and during assembly limits the insertion
of the casing to a predetermined amount.
Although FIGS. 1-3 show the dip tubes 42, 44 as being perfectly
concentric, it is to be noted that the end of the inner dip tube 44
adjacent the check valve casing 54 is free and unattached. In
practice, part of the inner dip tube may be disposed off center
with respect to the axis of the outer dip tube, and may occupy a
position of engagement at one or two points with the inner surface
of this outer tube. Such a construction is intended to fall within
the scope of the present invention as defined by the appended
claims.
The operation of the improved aerosol dispenser of the invention
can now be readily understood by referring to FIGS. 1-3. With the
container in an upright position as in FIGS. 1 and 2, the ball 62
engages the nibs 65, and the bore 56 of the casing provides
communication between the port 60 and annular channel 46, and the
area of the container adjacent the bottom wall thereof. The level
of liquid in the annular channel 46 will be the same as the level
outside the dip tube. The pressure in the upper part of the channel
46 is similarly equal to that in the upper part of the container
due to the notches 50 in the valve housing which provide for
pressure equalization in these two regions. Depression of the
button 36 will cause liquid to flow into the check valve casing 54
via the port 58 and the slots 66, past the ball 62 and out through
port 60, and into dip tube 44 to be discharged in the usual manner
through the valve housing 18 and stem 20. Such discharging is
illustrated particularly in FIG. 2.
When the container is inverted as in FIG. 3, the ball 62 assumes a
position in engagement with the valve seat 64, thus closing off the
port 60 and sealing this end of the annular channel 46 from the
adjacent area of the container bottom. A level of fluid in the
inner dip tube will be established in FIG. 3 depending among other
things upon the amount of fluid in the container when it was
inverted. However, this level will not necessarily equal the level
of fluid in the inverted container. When the valve stem 20 is
depressed, the fluid occupying the inner dip tube will gradually be
discharged. Since the port 60 is closed, the pressure of the
propellant in the can will cause fluid from the area adjacent the
cup portion 16 to flow into the annular channel 46 via the notches
50. Prolonged actuation will gradually deplete the fluid in the
inner dip tube, but before full depletion occurs, additional fluid
will be forced upward through the annular channel and will spill
over the lip of the inner dip tube to replenish the supply therein.
Thus, little or no propellant gas is lost, either from the bottom
portion of the inverted container or from the residual gas
occupying the portion of the inner dip tube adjacent its free
end.
From the above it can be seen that we have provided a novel and
improved dispenser adapted to be actuated from either an upright or
an inverted position. The above construction has the advantage of
extreme simplicity and low cost, since the dip tubes can be
economically fabricated from extruded plastic, and the check valve
molded as a single piece. The various parts are then merely pressed
together and assembled to the valve housing. The device thus
represents a distinct advance and improvement in dispenser
technology.
Variations and modifications are possible without departing from
the spirit of the invention.
* * * * *