U.S. patent number 3,785,532 [Application Number 05/309,717] was granted by the patent office on 1974-01-15 for dispensing pump.
This patent grant is currently assigned to Diamond International Corporation. Invention is credited to Rex C. Cooprider.
United States Patent |
3,785,532 |
Cooprider |
January 15, 1974 |
DISPENSING PUMP
Abstract
A dispensing pump for application to a container of product to
be dispensed comprising an annular housing member formed with a
concentric annular recess open at one axial end thereof. A flexible
bulbous diaphragm has an annular skirt received in fluid-tight
manner in said recess and closing said one axial end of said
annular member to define therewith a variable volume pump chamber.
Entering the other end of said annular member is a fluid inlet
passage. Valve means integrally carried by said diaphragm within
the pump chamber function to close said passage in response to
axial deformation of the diaphragm. This annular skirt has a free
lower edge portion within said recess normally covering a discharge
port through said annular member which communicates with the pump
chamber and said lower edge portion and said recess are mutually
conformed to permit radial outwardly deflection of said edge
portion to uncover said discharge port in response to a given fluid
pressure within the pump chamber.
Inventors: |
Cooprider; Rex C. (Hacienda
Heights, CA) |
Assignee: |
Diamond International
Corporation (New York, NY)
|
Family
ID: |
23199373 |
Appl.
No.: |
05/309,717 |
Filed: |
November 27, 1972 |
Current U.S.
Class: |
222/207; 251/344;
417/479; 417/566; 222/383.1; 251/340; 251/353 |
Current CPC
Class: |
B05B
11/307 (20130101); B05B 11/0044 (20180801); B05B
11/0029 (20130101); B05B 11/3032 (20130101) |
Current International
Class: |
B05B
11/00 (20060101); B65d 037/00 () |
Field of
Search: |
;222/207,213,382,383
;251/340,344,353 ;137/525.1,525.3 ;417/479,566 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Reeves; Robert B.
Assistant Examiner: Scaggs, Jr.; H. Grant
Attorney, Agent or Firm: Watson, Cole, Grindle &
Watson
Claims
What is claimed is:
1. In a dispensing pump of the type which comprises a housing of
circular cross-section and a resiliently deformable diaphragm, said
housing and said diaphragm jointly defining a variable volume pump
chamber; said housing being formed with an inlet passage opening
thereinto concentrically to its circular cross-section and a
discharge port opening radially outwardly through its circular
cross-section; the improvements which include:
an inlet valve carried by said diaphragm within the pump chamber to
close said inlet passage as the diaphragm is deformed; and a
discharge valve in the form of an annular skirt constituting an
integral portion of said diaphragm, said skirt snugly encircling
said housing and normally closing said discharge port, but being
deflectible to uncover such discharge port in response to increased
fluid pressure within said pump chamber.
2. In a dispensing pump as defined in claim 1 the further
improvement wherein said housing is formed with an annular recess
encircling said pump chamber and sealingly receiving said annular
skirt; said discharge port communicating with the recess in the
outwardly deflected position of said skirt; said housing including
a radially projecting discharge spout defining a discharge passage
in communication with said recess.
3. In a dispensing pump as defined in claim 1, the further
improvement wherein said inlet valve includes a stationary tubular
valve member, defining said inlet passage and extending upwardly
into said pump chamber with its upper free end in spaced relation
to said diaphragm, and movable valve member carried by the
diaphragm in normally fluid-tight telescopic relation with the
stationary valve member; one of said valve members being formed
with an intake port for establishing communications between the
pump chamber and said inlet passage only in the normally unstressed
position of the diaphragm.
4. In a dispensing pump as defined in claim 3, the feature wherein
said movable valve member is of tubular configuration snugly
encircling and receiving the upper free end of said stationary
valve member, said stationary valve member being provided with an
intake port which is covered and closed by the movable valve member
in all except the fully raised position of the latter member.
5. In a dispensing pump as defined in claim 3, the feature wherein
said inlet port is in the form of a downwardly extending groove in
the outer wall of said stationary valve member.
6. A dispensing pump for application to a container of product to
be dispensed comprising an annular housing member formed with a
concentric annular recess open at one axial end thereof, a flexible
bulbous diaphragm having an annular skirt received in fluid-tight
manner in said recess and closing said one axial end of said
annular member to define therewith a variable volume pump chamber;
means entering the other end of said annular member in sealed
relation thereto to define a fluid inlet passage directed toward
and spaced from said diaphragm; valve means integrally carried by
said diaphragm within the pump chamber to close said passage in
response to axial deformation of the diaphragm; said annular skirt
having a free lower edge portion within said recess normally
covering a discharge port through said annular member which
communicates with the pump chamber; said lower edge portion and
said recess being mutually conformed to permit radial outwardly
deflection of said edge portion to uncover said discharge port in
response to a given fluid pressure within said port.
7. The dispensing pump as defined in claim 6 in which said annular
housing is formed with a discharge passage establishing
communication between said recess and the atmosphere.
8. A dispensing pump as defined in claim 7 in which said housing is
formed with the discharge spout defining said discharge
passage.
9. A dispensing pump as defined in claim 6 in which said means
entering the other end of said annular member comprises an inner
member having a dip tube connected in fluid-tight relation thereto,
and an upward extension of said dip tube within the pump chamber in
axially opposed spaced relation to said diaphragm for cooperation
with said valve means integrally carried by the diaphragm.
10. A dispensing pump as defined in claim 6 in which said means
entering the other end of said annular member comprises an upward
tubular extension of a container closure cap, said extension being
closed at its lower end, the dip tube extending in fluid-tight
manner through said closed lower end and projecting upwardly into
the pump chamber to define said inlet passage, said extension
constituting a stationary valve means telescopically associated
with said valve means integrally carried by said diaphragm, one of
said valve means being formed with an inlet port for establishing
communication between said inlet port and the port chamber only in
a predetermined position of the said diaphragm.
11. A dispensing pump for application to a portable product
container comprising an inner member having a product intake
passage therethrough; a resiliently flexible bulbous diaphragm
having a depending annular skirt; an outer member embracing said
inner member and securing such diaphragm to said members to define
a pump chamber the volume of which may be varied by deformation of
said diaphragm; said outer member having concentric inner and outer
annular portions defining there between an annular recess in which
is received the annular skirt of said diaphragm; said skirt being
secured in fluid-tight manner between said inner and outer portions
adjacent to the mouth of said recess, and having a free peripheral
edge portion within the said recess spaced from the bottom of the
recess and of smaller radial dimension than the recess; said free
peripheral edge portion normally encircling said inner portion of
the outer member to close a discharge valve port establishing
communication between the pump chamber and the said recess, but
being resiliently outwardly deflectible by fluid pressure within
the pump chamber.
12. A dispensing pump as defined in claim 11 including inlet valve
means carried by the said diaphragm for cooperation with said inlet
passage in response to deformation of the diaphragm, to permit
unidirectional flow only of the product through said inlet passage
to the pump chamber.
13. A dispensing pump as defined in claim 12 in which said inlet
valve means comprises a stationary valve element supported within
said inner member in coaxial spaced relation thereto; said
diaphragm including a top wall deformable axially into the pump
chamber; a movable valve element carried by the top wall and
normally in fluid-tight telescopic engagement with said stationary
valve element, one of said valve elements being formed with a port
positioned to establish communication between said inlet passage
and said pump chamber only in the unstressed condition of the
diaphragm.
14. A dispensing pump as defined in claim 13 in which said movable
valve element is a sleeve integrally affixed to said top wall of
the diaphragm and snugly telescopically receiving said stationary
element.
15. A dispensing pump as defined in claim 14 in which the
stationary valve element comprises the upper end of portion of a
dip tube which extends in fluid-tight relation through the bottom
of the pump chamber.
Description
This invention relates to an improved dispensing pump of the type
in which the pumping action is achieved through deformation of a
resiliently flexible bulbous diaphragm.
Such pumps are exemplified in the prior patents of Cooprider U.S.
Pat. Nos. 2,815,890, Stewart U.S. Pat. No. 2,853,210 and Corsette
U.S. Pat. No. 3,102,489. All of these patents disclose arrangements
in which the deformable bulbous diaphragm has a depending annular
skirt which is received within an annular groove in the housing,
the flexible inner wall portion of the housing then being expanded
into gripping engagement with the skirt by one of the pump
components during assembly of the pump to securely seal the
diaphragm to the housing. Such prior construction has greatly
facilitated the pump assembly operation, while providing a superior
seal between the bulbous diaphragm and the pump housing; however,
such prior structure has employed inlet and outlet valve components
which are formed separately from the other pump components and thus
contribute to the number of parts requiring to be formed and
assembled.
In other prior art, as exemplified by the patent to Curtis U.S.
Pat. No. 3,029,742, there is disclosed an arrangement in which the
pump intake and discharge valves are integral with the bulbous
diaphragm, substantially reducing the number of pump components.
However, such arrangement is not suitable for use in a pump of the
type above described, and further it requires that the parts be
relatively rotationally oriented during their assembly.
With the foregoing in mind, it is the primary object of the present
invention to achieve an improved and simplified dispensing pump of
the type above described, in which the intake and discharge valves
constitute integral portions of the resiliently deformable
diaphragm, but are so arranged that they require no rotational
orientation with respect to the other pump components during their
assembly.
It is a further object to provide a construction in which the
bulbous diaphragm may be assembled to the pump housing in sealed
relation in the same advantageous manner as disclosed in the prior
patents to Cooprider, Stewart, and Corsette above identified.
Further, it is an object to provide in such an improved pump
structure a specifically new and advantageous arrangement of valves
which may readily be incorporated as integral portions of the other
pump components for assembly coincident with the assembly of the
other components.
It is still a further object to provide an inlet valve which, in
addition to its valving function, also acts as an auxiliary pump to
draw flowable product from the container up to a level above the
inlet port on each suction stroke of the bulb diaphragm to release
it for flow through the port by gravity and suction into the main
pump chamber for expulsion through the ensuing compression or
discharge stroke of the diaphragm.
A further feature of the invention is to provide such a pump which,
in addition to attaining the above specified objects, also is
capable of incorporating venting and return flow function
substantially in the manner disclosed in the prior Stewart U.S.
Pat. No. 2,853,210.
The preferred embodiment of the invention is illustrated in the
accompanying drawing and described with particularity in the
detailed description which follows, it being understood that such
drawings and detailed descriptions are by way of ememplification of
the invention and not by way of limitation.
In the accompanying drawing:
FIG. 1 is an axial vertical cross sectional view on an enlarged
scale through a dispensing pump incorporating the several
improvements of the present invention;
FIG. 2 is a magnified detail section, in the same plane as FIG. 1,
through the inlet valve portion of the pump dispenser.
Referring now in detail to the accompanying drawings, the pump
structure of the invention is adapted to be operatively supported
on a conventional product container such as a bottle, jar, or can,
by means of a conventional closure cap having a top wall 10 and a
cylindrical skirt 12 which is internally threaded or otherwise
adapted for application to the neck or dispensing opening of the
container. The closure cap is adapted for formation from a suitable
resilient plastic material such as linear polyethylene, and is
provided with an annular sealing rib 14 on its under surface for
sealing engagement with the upper end of the container neck all in
accordance with usual practice.
The inner member 15 of the pump structure is preferably formed as
an integral portion of the closure cap, being in the form of a
generally vertical sleeve having its upper end open. Its lower end
is closed by an integral cup-like web 16 through the bottom of
which extends a tube 18 which is molded integrally with the
remainder of the cap structure and includes a depending portion 18a
of sufficient length to reach nearly to the bottom of the container
with which the pump is associated, for communication with the
product therein. Also it will be seen that in this embodiment, the
tub 18 has an upward extension 18b disposed coaxially within the
sleeve or innter member 15 and spaced from the wall thereof for a
purpose hereinafter apparent. Manifestly the dip tube 18 and more
particularly the upper extension 18b thereof define the product
intake passage for the pump.
Encircling and preferably rotatably embracing the inner member 15,
is a generally annular outer member or valve housing 20 having
inner and outer annular portions 21 and 22 interconnected at their
lower edges to define between them an upperwardly opening annular
recess 24 in which is received the depending annular skirt 25 of an
elastic resiliently flexible bulbous diaphragm 26.
As in each of the prior patents of Cooprider, Stewart, and Corsette
heretofore identified, the outer portion 22 of the valve housing is
comparatively rigid and circumferentially continuous to receive and
confine the depending annular skirt 25, while the inner portion 21
of said housing is circumferentially expansible, preferably being
subdivided by a plurality of axial slots into an annular series of
upwardly directed radially deflectible fingers 28. The arrangement
is such that after the bulbous diaphragm 26 has been applied to the
valve housing, with its skirt 25 received in the recess 24, the
housing 20 is press fitted on to the inner member 25 which passes
upwardly through the inner member and deflects its fingers 28
outwardly to clamp the skirt 25 in fluid-tight manner against the
inner surface of the outer casing member 22 in an annular zone
adjacent to the mouth of the recess and axially upwardly displaced
from the free lower end of the skirt.
It will be noted that the skirt 25 is of downwardly decreasing
thickness towards its lower edge. Thus, it is of substantially
smaller radial dimensions adjacent its lower edge than the
corresponding axial zone of the recess and is spaced from the
bottom of the recess.
This free lower edge of the diaphragm skirt is so proportioned that
normally it snugly encircles the inner annular portion 21 of the
pump housing 10 to close the discharge valve port 30 extending
through the inner member 15 and the inner portion 21 of the pump
housing into the recess 24.
As above described, the depending lower edge of the diaphragm skirt
25 is proportioned to snugly encircle the inner annular portion of
the valve housing, thus to close the discharge port. But it is of a
material such as natural or artificial rubber which has sufficient
flexibility and elasticity so as to be resiliently outwardly
deflectible away from the port 30 by pressure within the pump
chamber 32 so as to admit liquid into the recess 24 for discharge
to the atmosphere through a discharge passage opening through the
outer portion of the pump casing into the recess and preferably
defined by a discharge spout 35 formed integrally with the pump
housing 20. The discharge valve 25 thus constituted by the annular
diaphragm skirt requires no angular orientation with respect to the
housing 20, but is operative in all positions of rotation on the
housing.
It will be readily observed that the bulbous diaphragm 26, together
with the pump housing 20 and inner body 15, jointly define the pump
chamber 32, the volume of which may be readily varied by
deformation of the bulbous diaphragm, preferably by downward finger
pressure on its upper end wall.
Inlet valve means formed integrally with the bulbous diaphragm 26
is operatively associated with the inlet passage defined by tube 18
for permitting unidirectional flow only of product through said
passage toward the pump chamber 32. Thus the inlet valve means of
the invention comprises the stationary valve body provided by the
upward extension 18b of the dip tube 18 within the pump chamber 32.
The inlet valve per se comprises a movable valve element in the
form of a generally cylindrical sleeve 36 carried by and preferably
formed integrally with the top wall of the bulb for axial
displacement therewith. This sleeve 36 is in fluid-tight
telescoping relation with the dip tube extension 18b for axial
movement with the diaphragm top wall, between a fully raised
position of rest as shown in FIG. 1, and a depressed position (not
illustrated) which will occur at the end of the compression or
discharge stroke of the pump, as caused by downward finger pressure
on the top wall of the bulb 26.
One of the cooperating discharge valve elements, in the present
instance the upward extension 18b of the dip tube, is formed with
one or more ports 38 (FIG. 2) positioned to establish communication
between the inlet passage defined by said tube and the pump chamber
32 only in the fully raised position of the movable valve element
or sleeve 36. By reference to FIG. 2 it should be noted that in the
preferred embodiment there are provided a multiplicity of such
ports 38 in the form of longitudinally extending grooves each
extending from the free upper end of the extension downwardly for a
uniform limited distance such as to establish communication between
the interior of the cooperating sleeve like valve element and the
surrounding pump chamber 32, only when the movable valve element 36
is in substantially its fully raised position, with the bulbous
diaphragm and pump chamber fully expanded.
With the foregoing arrangement it is desirable that the outer
member 20 be relatively rotatable on the member 15, so that the two
might cooperate as a valve mechanism operable when in the
dispensing portion of FIG. 1 to permit venting of air from the
atmosphere into the container interior as necessary to replace the
product withdrawn therefrom by the pump. To this end the inner
portion 21 of the outer member is provided along its inner surface
with a vertical groove or slot 40 positioned to register with a
vent 42 opening through the inner member as in FIG. 1. To
facilitate determination of this dispensing position, the outer
member is preferably provided with a suitable pointer 44 angularly
positioned for registry with a pointer or other indicia 46 affixed
to the closure cap and positioned to register angularly with the
pointer when the outer member is rotated to an operative position
in which the groove 40 and vent 42 are in communication with each
other.
In general the arrangement is substantially similar to that
disclosed in the prior Stewart et al. U.S. Pat. No. 2,853,210, and
further incorporates the feature substantially disclosed in that
patent in accordance with which the inner wall portion of the outer
member is provided with the vertical groove 48 or passage way which
normally is isolated from the discharge port 30 and the vent
opening 42, but which establishes communication between the
discharge port 30 and the vent opening 42 in a further nonoperative
position of rotation of the parts. In the event of inadvertent
depression or deformation of the flexible bulb 26 while the parts
are in this nondispensing position, the product discharged through
the discharge port 30 will simply be returned through the return
passage 48 and vent opening 42 back into the container, to avoid
unduly stressing and/or possible rupturing the bulbous diaphragm or
forcing the latter lose from its sealed connection to the outher
pump member 20.
It is particularly to be noted that the present invention, though
incorporating the various novel features and advantages as
aforementioned, uses but three separately formed parts (diaphragm
26, outer member 20, and inner member 15) which may be produced by
conventional plastic molding and fabricating means and methods, and
may be readily assembled without necessity for relative angular
orientation of the respective parts.
In assembling these several parts, the bulbous diaphragm 26 is
first assembled to the outer pump member by inserting its depending
skirt 25 into the upwardly opening recess 24 of the latter member
until the annular downwardly directed shoulder and sealing rib 50
of the diaphragm engages the upper end edge of the outer member.
The inner member 15 is then inserted upwardly through the bottom of
the downwardly opening outer member 20 whereby its upper end will
expand the upper end portions of the flexible fingers 28 of the
inner member radially outwardly to clamp the skirt firmly between
such fingers and the encirling band provided by the outer portion
22 of the outer member. There is thus established a sealing
engagement between the skirt and portion 22 in a circular zone
displaced upwardly from the lower or free edge portion of the
diaphragm skirt.
The upper end of the inner member preferably is radially enlarged
so that after expanding the flexible fingers 28 radially outwardly
it interlocks above them in the manner of a snap fitting, to then
resist disassembly as between the inner and outer members.
The dispensing pump as thus assembled is in readiness for
application to a container to dispense the liquid or other flowable
products therein contained. For this purpose the cap is threaded on
or otherwise applied to the neck of the container with its dip tube
18 depending to a location near the bottom of the container where
it is immersed in the product to be dispensed.
In order to dispense the product, the outer member 20 and spout 36
are rotated on the inner member to bring the pointers 44 and 46
into angular registry and thus to bring discharge port segments 30
0f the inner member and the outer member into registry, following
which the product may be dispensed by intermittent downward finger
pressure on the top wall of the bulbous diaphragm 26. As the
diaphragm is depressed downwardly, the intake valve member 36 is
telescoped downwardly on its cooperating dip tube extension 18b,
while any air trapped in the pump chamber 32 is correspondingly
pressurized so as to open the discharge valve defined by skirt 25
to be released through the port 30 and discharge passage 34. As the
finger pressure is released and the bulb 26 is permitted to
reexpand to its normal volume, the ensuing upward movement of the
valve member 36 on the dip tube extension 18b draws the flowable
product upwardly through the dip tube 18. After one or more
depressions of the diaphragm 26, the product is drawn into valve
member 36 to a level above the upper end of the dip tube extension
18b, so that when the diaphragm fully regains its normal shape,
with the valve member fully raised as in FIG. 1, the product is
free to escape through the grooves 38 into the pump chamber 32,
both by action of gravity as well by reduced pressure within that
chamber resulting from expansion of the diaphragm.
After product is received within the pump chamber 32, each
depression or downward deformation of the flexible diaphragm within
the pump chamber will force the product outwardly from that chamber
through the discharge port 30 with sufficient pressure to open the
discharge valve 25 so that the product may flow beneath the lower
edge of that valve and thence outwardly through the discharge
passage 34. The pump may be actuated by intermittent pressure on
the flexible diaphragm to dispense as much of the product as is
desired.
Thereafter, the outer member 20 and spout 36 may be rotated on the
inner member to a position to which the venting groove or passage
40 is disconnected from the vent opening 42 and the latter is
placed in communication with the discharge port 30 by way of the
return passage 48 in the internal wall of the outer member.
It will be apparent that the pump components require no particular
angular orientation incident to their assembly. They comprise but a
minimum number of easily assembled parts which incorporate the
discharge and inlet valves as integral molded portions of the
diaphragm structure.
Although in this application there has been shown and described
only a single preferred embodiment of the invention, it will be
readily apparent that the invention is capable of other and
different embodiments and that its several details may be varied in
a number of respects -- all without departing from the invention as
defined in the appended claims.
* * * * *