U.S. patent number 3,658,209 [Application Number 05/084,961] was granted by the patent office on 1972-04-25 for automatic cycling discharging device.
This patent grant is currently assigned to General Time Corporation. Invention is credited to David E. Earls, John D. Freeman.
United States Patent |
3,658,209 |
Freeman , et al. |
April 25, 1972 |
AUTOMATIC CYCLING DISCHARGING DEVICE
Abstract
The device has a timing system which consists of two chambers
interconnected by a constricted passage and by a quick opening
valve one chamber being permanently filled with a timing fluid,
advantageously a liquid. A flexible member having means providing
snap action forms the wall between one of these chambers and a
discharge chamber from which pressure fluid is ejected to the
atmosphere. Pressurized fluid from a pressure pack, such as an
aerosol container, passes first to a metering chamber and then to
the surface of the flexible member by which it is ejected through a
discharge outlet.
Inventors: |
Freeman; John D. (Westport,
CT), Earls; David E. (Norwalk, CT) |
Assignee: |
General Time Corporation
(Phoenix, AZ)
|
Family
ID: |
22188306 |
Appl.
No.: |
05/084,961 |
Filed: |
October 29, 1970 |
Current U.S.
Class: |
222/649;
137/624.14; 222/499; 222/335 |
Current CPC
Class: |
B65D
83/265 (20130101); Y10T 137/86413 (20150401) |
Current International
Class: |
B65D
83/16 (20060101); B67d 005/08 () |
Field of
Search: |
;222/16,22,59,61,70,72,335,402.2,494,499,54,71,397 ;137/624.14
;239/70 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Coleman; Samuel F.
Assistant Examiner: Martin; Larry
Claims
We claim:
1. In an automatic fluid discharging device for use with a pressure
pack containing pressurized fluid which includes mechanism actuated
by said pressure fluid for intermittently discharging a spray of
fluid from said pressure pack and including a discharge chamber one
wall of which is flexible for varying the enclosed volume, the
improvement which comprises,
a cooperating fluid timing system including first and second
chambers interconnected by a constricted passage and by a pressure
equalizing valve, the second chamber being filled with timing
fluid, one wall of such chamber being common with said flexible
wall, and means providing snap action of said flexible wall between
outwardly and inwardly flexed positions to actuate said pressure
equalizing valve.
2. An automatic fluid discharging device according to claim 1 in
which the second chamber of the timing system is filled with a
liquid.
3. An automatic fluid discharging device for use with a pressure
pack containing a pressurized fluid which comprises:
a. a fluid timing system including first and second chambers
interconnected by a constricted passage and by a pressure
equalizing valve, the second chamber being filled with timing
fluid, at least one wall of the second chamber being flexible for
varying the enclosed volume, and means providing snap action of
said flexible wall between outwardly and inwardly flexed positions
thereof, and
b. a pressurized fluid section including,
a metering chamber having a valved inlet from the pressure
pack,
means for introducing fluid from the pressure pack by way of said
metering chamber to the second surface of said flexible wall,
a valve stem actuated by said flexible wall, a discharge outlet,
and
valve means associated with said stem including said valved inlet
for controlling the flow of pressurized fluid so that when said
flexible wall is flexed outwardly said valve means permits flow to
the outer surface of the flexible wall, also when said flexible
wall is in the snap action position said valve means prevents fluid
flow between the pressure pack and metering chamber and, when said
flexible wall reaches a position beyond the said snap action
position said pressure equalizing valve is opened permitting rapid
motion of said flexible wall to its inwardly flexed position and
thereby permitting flow of the metered fluid through the discharge
outlet thus reducing the pressure on the outer surface of said wall
and allowing said wall to flex to its outward position.
4. An automatic fluid discharging device according to claim 3 in
which the second chamber of the timing system is filled with a
liquid.
5. An automatic fluid discharging device for use with a pressure
pack containing a pressurized fluid which comprises:
a. a fluid timing system including first and second chambers
interconnected by a constricted passage and by a pressure
equalizing valve, the second chamber being filled with timing
fluid, at least one wall of the second chamber being flexible for
varying the enclosed volume, and means providing snap action of
said flexible wall between outwardly and inwardly flexed positions
thereof, and
b. a pressurized fluid section including,
a metering chamber having a valved inlet from the pressure
pack,
means for introducing fluid from the pressure pack through said
metering chamber to a third (FIGS. 2, 3 and 4) chamber one wall of
which is formed by the outer surface of said flexible wall,
a valve stem actuated by said flexible wall, a discharge outlet,
and
valve means associated with said stem including said valved inlet
for controlling the flow of pressurized fluid so that when said
flexible wall is flexed outwardly said valve means permits flow to
the outer surface of the flexible wall, also when said flexible
wall is in the snap action position said valve means prevents fluid
flow between the pressure pack and metering chamber and, when said
flexible wall reaches a position beyond the said snap action
position said pressure equalizing valve is opened permitting rapid
motion of said flexible wall to its inwardly flexed position and
thereby permitting flow of the metered fluid through the discharge
outlet thus reducing the pressure on the outer surface of said wall
and allowing said wall to flex to its outward position.
6. An automatic fluid discharging device according to claim 5 in
which the second chamber of the timing system is filled with a
liquid.
7. An automatic fluid discharging device for use with a pressure
pack containing a pressurized fluid and having a siphon tube, which
device has a body member including,
outer and inner timing chambers separated by a crosswise partition,
the inner chamber having a crosswise snap action diaphragm the
inner surface of which forms one wall of a control chamber,
a constriction connection between said chambers,
a member projecting from said body for connection with said siphon
tube and having a receiving chamber for pressurized liquid,
a passage in said body interconnecting said control and receiving
chambers,
a hollow valve stem fixed to the diaphragm and extending through
said passage and through said receiving chamber,
said interconnecting passage having an annular space surrounding
the valve stem,
an outlet channel in the body member extending from said annular
space,
seal ring members surrounding the hollow valve stem and positioned
respectively adjacent the outer surface of the control chamber, at
the inner end of the receiving chamber and at the outer end
thereof,
the hollow valve stem having lateral valve ports cooperating
respectively with the control chamber seal ring and the seal ring
at the inner end of the receiving chamber, and having a shoulder
adjacent its inner end cooperating with the seal ring at the outer
end of the receiving chamber,
a valve opening in said partition between said outer and inner
timing chambers,
a spring closed valve cooperating with said opening, and
the diaphragm actuating said valve member to open the same on the
diaphragm outer stroke thus quickly equalizing the pressure in the
two timing chambers and allowing the diaphragm to complete its
outward stroke and then commence its return stroke.
8. An automatic fluid discharging device for use with a pressure
pack containing a pressurized fluid which comprises:
a. a fluid timing system including first and second chambers
interconnected by a constricted passage and by a pressure
equalizing valve, the second chamber being filled with timing
fluid, at least one wall of the second chamber being flexible for
varying the enclosed volume, and means providing snap action of
said flexible wall between outwardly and inwardly flexed positions
thereof, means actuated by said flexible wall for operating said
pressure equalizing valve, and
b. A pressurized fluid section including,
a metering and discharge chamber adjacent said flexible wall,
a duct extending from the pressure pack to said metering and
discharge chamber and to said flexible wall having an inlet valve
therein,
a valve stem actuated by said flexible wall,
a discharge outlet and valve therefor, and
means actuated by said stem for controlling said inlet and
discharge valves.
Description
BACKGROUND OF THE INVENTION
Such devices are known in the art which function to eject metered
quantities of the contents of the pressure pack at certain time
intervals. A serious disadvantage of these prior devices is their
relatively high cost inasmuch as they employ as the timing
mechanism electrically powered or spring powered clockwork units,
or mechanical devices operated by the pressurized fluid which are
highly complicated in their construction and operation.
SUMMARY OF THE INVENTION
The invention relates to the automatic release at predetermined
time intervals of pressurized fluid from containers, aerosol
containers being one example. The device is entirely self-contained
and requires no external mechanism for controlling the periodic
discharge.
The automatic cycling device includes two systems or sections, a
timing system and a pressurized fluid system or section. The timing
system features two chambers one of which is permanently filled
with a timing fluid. These chambers are interconnected by a
constricted passage and by a quick acting pressure equalizing
valve, and the inner wall of one of the chambers may be formed by a
flexible diaphragm, advantageously a snap action diaphragm.
However, any diaphragm or flexible member having associated
therewith some means for biasing it from its central position
towards its opposite end positions may be used.
The pressurized fluid section includes a control and discharge
chamber one wall of which is formed by this diaphragm or flexible
member. This section includes also a metering chamber into which
the pressurized fluid from the pressure pack flows at predetermined
times. There is a passage between these two chambers and a valve
stem fixed to the diaphragm extends through this passage and the
metering chamber. In one form of the invention the portion of the
valve stem between these two chambers has an internal duct provided
with valve ports which cooperate with stationary sealing rings
location respectively adjacent the bottom wall of the control or
discharge chamber and adjacent the top of the metering chamber. A
shoulder at the lower end of the valve stem cooperates with a third
sealing ring at the entrance to the metering chamber to control the
admission of pressurized fluid from the pressure pack.
In a second form of the invention an inlet from the pressure pack
extends alongside of the valve stem, which is fixed to the
diaphragm as in the first form of the invention. This inlet passage
conducts the pressure fluid to the diaphragm and metering chamber
or area. The valve stem controls both an admission valve in the
inlet passage and a discharge valve by which the pressure fluid is
admitted to the discharge inlet. The timing system is the same
two-chamber system as in the first form of the invention.
The cycle of operation starts with the metering chamber or area
filled and with the valve stem in its outermost position. The
pressure fluid flows inwardly to the diaphragm and forces the
diaphragm inwardly thus causing the timing liquid to flow through
the restriction passage into the other of the two chambers. When
the diaphragm reaches its snap action or snap-over position its
inward movement is accelerated and the diaphragm contacts and opens
the quick acting valve thus quickly equalizing the pressure in the
two chambers. The control or discharge chamber is connected with a
discharge outlet through which the metered amount of pressurized
liquid is ejected into the atmosphere. As the pressure in the
control chamber drops the diaphragm supplies an outward force
returning the valve stem to its initial position. A new cycle
begins immediately.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view on a greatly reduced scale showing the
automatic spray device of the invention and the upper portion of an
aerosol can;
FIG. 2 is a view in vertical central section of the spray device
drawn to a greatly enlarged scale;
FIGS. 2a and 2b are somewhat diagrammatic vertical sections of a
priming and shut-off valve;
FIG. 3 is a view similar to FIG. 2 but with the diaphragm and valve
stem assembly in a different position;
FIG. 4 is a third view similar to FIG. 2 with the diaphragm and
valve stem assembly in still another position;
FIG. 5 is a pressure-deflection curve of the snap action diaphragm,
and
FIG. 6 is a vertical central section similar to FIGS. 2, 3 and 4
showing a modification.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring first to FIGS. 1-4 the automatic cycling discharging
device of the invention has a body member 1 and will be described
as in vertical position and secured to the top of an aerosol
container 2 (FIG. 1). Body 1 contains an upper timing chamber 3 and
a lower timing chamber 4 separated by a horizontal partition 5.
Upper chamber 3 is shown closed by means of a cover 6 although it
may be closed in any other desired manner. But if desired upper
chamber 3 may be open to the atmosphere. Lower chamber 4 is defined
between partition 5 and the upper surface of a flexible snap action
diaphragm 7, the peripheral edge of which is mounted in fixed
position in any suitable manner in the vertical wall of body 1. For
this purpose body 1 may be made in two parts, if desired.
The timing chambers 3 and 4 are interconnected by means of a
constriction passage 8 and by a large valve opening 9 through
partition 5. As shown, constriction passage 8 is formed in a nose
piece 10 projecting from one side of body 1 and may include a
tortuous portion 11. The degree of constriction will depend upon
the frequency of ejection of the pressurized fluid desired. The
frequency of ejection may be made variable if desired by making
passage 8 adjustable to vary the amount of constriction. Valve
opening 9 is closed by means of a pad 12 fixed to the end of a
valve member 13 which is pivoted at 14 to the underside of
partition 5. A light flat spring 15, also mounted beneath partition
5, biases valve member 12 to closed position.
When the device is not in operation lower chamber 4 and at least
the lower portion of constriction passage 8 are filled with a
timing liquid and chamber 3 may be partially filled. A closed
timing system for the automatic cycling device is thus
provided.
Cooperating with this closed timing system is the pressure fluid
section of the device which will now be described. This section
includes a control and discharge chamber 16 formed between the
lower side of diaphragm member 7 and the floor 17 of the
cylindrical cavity for the diaphragm within body member 1, together
with a metering chamber 18 and a fluid passage 19 which extends
between these two chambers 16 and 18. Completing the pressurized
fluid section is a valve means activated by diaphragm 7 which as
shown includes a valve stem 20 which is fixed to the central
portion of diaphragm 7 and extends downwardly through passage 19
and through metering chamber 18 to and slightly beyond the bottom
thereof.
Metering chamber 18 is formed in the upper portion of a cylindrical
member 21 the upper end of which is received in a threaded opening
in body 1 as shown and which at its lower end is joined in any
suitable manner to the upper end of the siphon tube 23 of the
aerosol container. Member 21 includes a manual priming and shut-off
valve 22 to be described.
The discharge outlet for the pressurized fluid is shown at 24 and
includes a channel 25 leading from passage 19. Passage 19 surrounds
the upper portion of valve stem 20, and the valve stem is hollow at
its upper portion forming a duct 33 which is somewhat longer than
passage 19.
The lower end of valve stem 20 is slabbed to provide a shoulder 26
which cooperates with a sealing ring 27 in order to control the
admission of pressure fluid from siphon tube 23 to metering chamber
18. At the upper end of metering chamber 18 there is a second
sealing ring 28, and just below the surface of floor 17 of control
chamber 16 there is a third sealing ring 29. Valve ports 30 and 31
opening laterally into duct 33 in hollow valve stem 20 cooperate
respectively with sealing rings 28 and 29 to control the flow of
the fluid to the discharge chamber 16 and from this chamber,
through passage 19 to the outlet channel 25. As shown an upstanding
projection 32 above diaphragm 7 actuates valve member 13.
In order for the device to function metering or receiving chamber
18 must be primed first, i.e., filled with pressure fluid from the
aerorol container. This is accomplished by manually turning the
priming and shut-off valve 22 to the position shown in FIG. 2a
where the pressure fluid from siphon tube 23 can flow through the
curved passage 22a in valve member 22 to a passage 22b which
conveys the fluid to metering chamber 18 independently of the valve
formed by the shoulder 26 and sealing ring 27. When valve 22 has
been in the position of FIG. 2a for a sufficient time for chamber
18 to be filled, which requires only a matter of seconds, valve 22
is manually turned to the operating position shown in FIG. 2. When
it is desired to discontinue the operation of the cycling
discharging device valve 22 is manually turned to the position
shown in FIG. 2b.
In the operation of the device, assuming that pressurized liquid
has been admitted to fill metering and receiving chamber 18, and
with ports 30 and 31 in the position of FIG. 2 this metered volume
of liquid can flow through port 30 into duct 33 in valve stem 20
and thence upwardly and through port 31 into discharge chamber
16.
It will be understood that the pressurized fluid from the pressure
pack or aerosol can 2 includes a propellant and an active
ingredient. The character of the latter will depend upon the type
of discharge desired, whether an insecticide, room freshener, or
other.
The aerosol or other pressurized liquid may vaporize partially in
order to fill control and discharge chamber 16 whose volume may be
greater than that of metering chamber 18.
The pressure within control or discharge chamber 16 exerts an
upward force on diaphragm 7 (FIG. 2) and the timing liquid filling
chamber 4 begins to flow through constriction 8 into chamber 3. The
diaphragm moves upwardly at a rate determined by the pressure
exerted by the pressurized fluid against diaphragm 7 and the
resistance to flow provided by constriction 8. After a
predetermined time the diaphragm and valve stem assembly will have
moved up to the position shown in FIG. 3 where port 30 is closed by
sealing ring 28 and projection 32 is in contact with valve lever
13. Soon after this diaphragm 7 passes the "knee" of its
force-deflection curve (FIG. 5) and is at its snap action or
snap-over point. It continues to move up under its reversed
deflecting force and still under the fluid pressure in control
chamber 16. This movement raises the right end of valve lever 13
and thereby opens valve port 9 slightly as shown in FIG. 3.
When valve port 9 starts to open timing liquid in chamber 4 begins
to pass at a faster rate into chamber 3. The diaphragm and valve
stem assembly can then move upward at a faster rate opening valve
port 9 wider. This valve arrangement provides an avalanche action
dumping liquid from chamber 4 into chamber 3 so that the diaphragm
valve stem assembly moves up quickly to the position shown in FIG.
4. Pressurized fluid from control chamber 16 now passes through
port 31, duct 33 and port 30 into annular passage 19 and into
outlet channel 25 and thence into the atmosphere through discharge
outlet 24. In the upper position of valve stem 20 shoulder 26 is
raised above sealing ring 27 thus permitting another metered volume
of pressurized liquid to refill receiving and metering chamber
18.
Pressure in discharge chamber 16 is maintained so long as liquid
propellant exists therein. After all liquid is expelled or
vaporized the pressure will quickly drop and diaphragm 7 will begin
to move downwardly. In so doing the diaphragm will pass its snap
action or snap-over point and will therefore supply a downward
force to drive valve stem 20 to its lowest position. During this
time the timing liquid from upper chamber 3 returns to lower
chamber 4 through valve port 9, valve 12 opening against the
flexing of spring 15 due to the decreased pressure in chamber 4.
Some of this liquid also returns through constriction passage 8.
The mechanism is now ready to repeat the cycle described above, the
parts having returned to their positions as shown in FIG. 2.
In a second form of the invention shown in FIG. 6 an inlet from the
pressure pack extends alongside the valve stem and conducts the
pressure fluid to the metering chamber and diaphragm. No priming
valve is required. The device has a body 34 having upper and lower
timing chambers 35 and 36 separated by a horizontal partition 37. A
cap member 38 closes the top of chamber 35.
A snap action diaphragm 39 is mounted with its circular rim in
fluid-tight relation around the lower corner of lower chamber 36. A
timing liquid fills chamber 36 and may be introduced through the
opening 40 closed by a screw threaded plug.
Chambers 35 and 36 are interconnected by means of a constriction
passage 41 and a quick opening valve V-1 which is mounted at the
lower part of an upright threaded rod 42 and maintained in normally
closed position by a helical spring 43. Valve V-1 is actuated by a
lever 44 centrally pivoted on the lower end of a screw-threaded pin
45 and operated by contact with a nut 46 on the upper end of a
valve stem 47 which is clamped to diaphragm 39 between nut 46 and a
second nut 48. The left end of lever 44 is forked and bears down on
a cross pin 49 on the lower end of valve rod 42.
Immediately below diaphragm 39 there is a recess 50 formed in the
lower surface of chamber 36. The chamber formed by this recess
serves the purposes of the metering or receiving chamber and the
control and discharge chamber. At its left side as shown in FIG. 6
is the discharge valve V-2 at the lower end of a short valve rod 51
which has an aperture 52 at its upper end to receive an actuating
lever 53. This lever is a thin metallic bar having an enlarged
central opening for valve stem 47 and a forked right end for a
screw 54 which forms a pivot for lever 53. Valve stem 47 operates
lever 53 through an enlargement 55 which is part of the valve stem
and which has a rounded upper surface as shown to engage the lower
surface of lever 53.
Discharge valve V-2 is arranged within a vertical circular opening
56 extending upwardly from the lower surface of body member 34. It
cooperates with a seat 57 supported on the upper end of a threaded
member 58 which is screwed into the lower portion of opening 56. A
coil spring 59 holds valve member V-2 in normally closed position.
A discharge nozzle 60 is threadedly engaged with the lower end of
member 58.
The device is supported on the upper end portion of a siphon tube
61 of an aerosol container 62. No priming valve is required but
siphon tube 61 is provided with a shut-off valve 63 which may be
closed when the cycling discharge device is not in use. The upper
end of siphon tube 61 is received within the lower portion of an
axial passage 64 through a cylindrical threaded member 65 which is
mounted in a threaded opening 66 at the bottom of body 34.
In the upper portion of member 65 there is a coil spring 67 at the
upper end of which is a third or inlet valve member V-3 which
cooperates with a seat 68. Inlet valve V-3 is actuated by the head
of an adjustable screw 69 which extends downwardly from the lower
end of valve stem 47. This valve controls a passage for the fluid
from the pressure pack 62 through axial passage 64 and a passage 70
alongside of valve stem 47 to the chamber formed by recess 50 and
diaphragm 39.
In operation the device of FIG. 6 differs from the device of FIGS.
2, 3 and 4 in several respects as will be easily understood. A
major difference is that the pressure fluid from the aerosol
container 62 passes directly upward through axial passage 64 and
passage 70 directly to the metering chamber or area and into
contact with the lower surface of diaphragm 39. The metering area
is formed by recess 50 and the passages connecting it with
discharge valve V-2 as well as a small annular space around the
lower rim portion of diaphragm 39. These areas are open to the
aerosol container 62 until valve stem 47 moves upwardly and closes
valve V-3.
At the start of a cycle valves V-1 and V-2 are closed and V-3 is
open. As the pressure fluid acts on diaphragm 39 it flexes upwardly
pulling stem 47 with it and causes valve V-3 to close as indicated
in FIG. 5. This occurs before the diaphragm reaches its snap-over
point. The diaphragm continues upwardly passing this point and the
rate of upward travel depends upon the rate of flow of timing fluid
through constriction passage 41. Valve V-1 opens allowing diaphragm
39 and stem 47 to move up faster and quickly open discharge valve
V-2. Pressure fluid within the metering area above referred to is
discharged through nozzle 60 to the atmosphere. As the pressure
fluid is discharged its pressure on the diaphragm is reduced and
this permits the diaphragm to relax to its intial position. The
next cycle then commences.
It will be understood that other devices may be used in place of a
snap action diaphragm. Thus for example a diaphragm having a linear
pressure-deflection curve may be used in connection with a toggle
mechanism or in connection with two permanent magnets, one arranged
to urge the diaphragm in one direction, and the other arranged to
urge the diaphragm in the opposite direction. Furthermore a
bellows, or a mere flexible sealing member, wall or partition may
be used in combination with a toggle mechanism or two permanent
magnets.
* * * * *