Information
-
Patent Grant
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6186368
-
Patent Number
6,186,368
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Date Filed
Wednesday, May 26, 199925 years ago
-
Date Issued
Tuesday, February 13, 200123 years ago
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Inventors
-
-
Examiners
- Shaver; Kevin
- Bastianelli; John
Agents
-
CPC
-
US Classifications
Field of Search
US
- 222 3217
- 222 3219
- 222 3212
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International Classifications
-
Abstract
A finger operated pump assembly comprising a pump body having a base supporting an outer housing and an inner housing and defining a first portion of a compression chamber therebetween. A piston is at least partially received within the pump body and is slidable relative to the pump body along an inner surface of the outer housing. The piston has an annular lip for providing a sealing engagement with the pump body, and the piston is provided with a piston outlet defined by a poppet valve seat. A poppet is accommodated by the inner housing and the poppet is biased away from the base into engagement with the poppet valve seat by a spring to normally close the piston outlet. The poppet, the base and the inner housing all define an interior cavity. A peripheral passageway communicates with the compression chamber, and the passageway includes a one-way valve which allows the product to flow along the passageway toward the compression chamber. The interior cavity is provided with a ventilation port which allows the interior cavity, during operation of the poppet, to operate at ambient pressure. The pump body is coupled to a turret which is connected to a closure.
Description
FIELD OF THE INVENTION
The invention relates to an improved manually operated pump assembly, categorized as an accumulative pump, for dispensing a product under high pressure. The pump assembly comprises a compression chamber for pressurization of the product to be dispensed and a relief valve operating, substantially at ambient atmosphere, for controlling the release of product through a piston outlet of the pump.
BACKGROUND OF THE INVENTION
A variety of prior art manually operated hand-held pump assemblies are well known and used for dispensing a variety of products such as liquids for personal care and pharmaceutical uses, fragrance products and the like. Pumps of this type comprise a housing body and a slidable piston which together define a compression chamber for receiving and dispensing of the product. The body, as well as the internal components contained within the body, are retained by a turret. An inlet in the base of the body communicates, via a dip tube, with the product to be dispensed. A conventional spray actuator communicates with an outlet of the piston to facilitate operation of the pump and provides a mechanical mechanism for dispensing the product, as desired, by an operator.
Directional flow of product to be dispensed, from the interoir of the container into the compression chamber of the body, is controlled by a first one-way valve, typically located at or adjacent to the coupling of the body inlet to the dip tube. A second one-way valve enables the product to be dispensed from the compression chamber through the piston outlet and into a supply passage of the actuator. Finally, the product is dispensed out through a discharge orifice of the actuator.
It is desirable for the pump to reach a specified pressure, prior to releasing the product to be dispensed from the compression chamber, to ensure that the product dispensed out the discharge orifice exhibits consistent and uniform spray characteristics. For example, some sprays need to consist of particles of uniform size, e.g. particles lying within a narrow particle size range, in order for proper dispensing of the product. It is also desirable to dispense a specific dosage of product during a single actuation of the actuator. To accomplish both the desired dosage and particle size requirements, the construction and function of the pump assembly require accurately designed internal components which must be precisely controlled during operation of the pump assembly. Because the body, the piston, the spring, the valve, etc., determine the configuration and operating pressure of the compression chamber, these components are very important in controlling the function of the pump assembly.
Product dispensing requirements are increasingly more demanding. With an increase in the use of low volatile solvents, as the main carrier component for the product to be dispensed, and as well as using more viscous gel-type liquids, the design requirements for dispensing such products are more critical. In particular, the low volatile solvents and the viscous gel-type liquids require higher discharge pressures, to facilitate proper dispensing thereof, versus products that include solvents which are readily converted into vapor upon discharge. In an attempt to overcome this problem and facilitate control of the resulting spray configuration, many prior art pump assemblies use a single spring to both actuate the piston and also bias a second one-way valve. This single spring forces the piston back into its initial static position, once the actuator has actuated the piston, and holds the second one-way valve closed until a desired operating pressure is reached.
Other prior art designs use a first spring for returning the piston and a second spring for biasing the second one-way valve independently of the piston. The intended advantage of the two spring arrangement is that the second one-way valve spring can be independently adjusted to facilitate opening of the piston valve at a desired operating pressure. In either case, the second one-way valve and the spring(s) are all contained within the compression chamber of the body and are subjected to the generated operating pressure within the compression chamber. The spring(s) (or other known conventional biasing members) are typically located to bias the second one-way valve against a piston valve seat. The amount of pressure required to compress the spring, and thus move the second one-way valve away from its associated valve seat, determines the operating pressure of the pump assembly. The construction of the spring thus determines the pressure at which the product is displaced from the body out through the discharge orifice. The spring pressure translates into a high reaction force upon the product as it is released by the second one-way valve and overcomes the spring bias.
It is to be appreciated that in order for the pump assembly to dispense liquid properly, the pump section of the assembly must be initially purged of any air contained within the compression chamber-this initial purging step is commonly referred to as “priming” of the pump. When the actuator is initially depressed by an operator, any air contained within the compression chamber of the body must be displaced in order for product to be siphoned into the compression chamber of the body via the dip tube. By depressing the actuator, the piston is moved toward a base of the body thereby compressing the spring as well as any air contained within the compression chamber. The compressed air assists with maintaining the first one-way valve in a closed position. The compressed air also induces an opening force on the second one-way valve but, in most cases, the induced force of the compressed air may never reach a high enough pressure to overcome the spring closing force of the second one-way valve. For this reason, prior art pumps use a small rib(s), or some other mechanical device located near the end of the compression stroke, to disrupt the seal between an inner part of the body and the piston and allow the compressed air to escape from the compression chamber. Two methods are used for allowing the compressed air to escape from the compression chamber. The first method is to allow the air to escape around the piston which can result in residual product drying along the escape path and seizing the piston. The second method is to allow air to escape down the dip tube which results in the air and the product to be dispensed reciprocating back and forth within the tube, which is also undesirable.
Because both the second one-way valve and the spring occupy space inside the body, these components effect the compression of the air during the priming operation of the pump, and thus effect the operation of the second one-way valve. This also means that the product, siphoned via the dip tube into the body, is then pushed back through the system in the reverse direction as the piston reciprocates. This to and for movement of the air and the product reduces the efficiency of the pump and increases the force needed to operate the system. In addition, the number of strokes required in order to remove the air contained within the compression chamber is increased.
SUMMARY OF THE INVENTION
Wherefore, it is an object of the present invention to overcome the aforementioned problems and drawbacks associated with the prior art pump assembly designs.
Another object of the present invention to design a pump assembly, utilizing a smaller number of components, which is efficiently primed and operated while still ensuring a high dispensing efficiency for the pump assembly.
A further object of the invention is to provide a movable poppet which operates at ambient pressure so that the function of the poppet is essentially unaffected by the flow or circulation of the product to be dispensed within the compression chamber.
Still another object of the invention is to increase the compression efficiency of the pump assembly and also minimize the number of strokes required to “prime” the pump assembly by providing a spring which is not located along or in communication with the product dispensing flow path so that the spring is not hindered by and does not hinder or interfere with the flow of the product to be dispensed.
Yet another object of the invention is to provide a simpler, lower cost, higher quality and efficient spray pump assembly that provides the same spray characteristics for low volatile solvents, water based products, alcohol base and/or other formulas.
A still further object of the invention is provide a pump assembly having a dispensing dosage of between about 120-250 ml of product, or so, an actuation force of between about 5.5-7.5 lbs., or so, and an internal operating pressure of the compression chamber of between about 100 to 170 psi, or so.
The manually actuated pump assembly, according to the present invention, is capable of dispensing a wide range of products. The highly efficient internal volume and priming system, according to the present invention, renders the manually actuated pump assembly ideal for use with personal care products, pharmaceuticals, fragrances, etc. A majority of the structural components of the manually actuated pump, according to the present invention, are located outside of the compression chamber thereby allowing minimal clearance between the inwardly facing surfaces defining the compression chamber when those surfaces are moved into the fully actuated position. Such design of the pump assembly aids in both priming and normal operation of the pump assembly.
Priming is accomplished by venting the trapped air either out through the discharge orifice or past a seal formed between the poppet and an inner cylindrical housing, rather than down the dip tube or around the compression piston. The prior art dispensing systems, that prime through the dip tube, experience difficulties when dispensing gels or high water content products or when utilizing a long length dip tube. As note above, the pump assemblies that prime around the compression piston have a tendency to become clogged or seized due to drying of the product residue.
During normal operation, according to the present invention, the pump assembly has a high operating pressure due to the ratio of the compression chamber diameter to the piston stroke length. With an operation pressure of approximately 130 psi or so, the manually actuated pump according to the present invention operates about 30% higher than conventional pumps currently available on the market today. Another advantage of the high compression design, of the present invention, is the uniform spray consistently achieved during each dispensing stroke. In addition, less variation in the internal volume results by locating the spring and valving components external of the compression chamber. Lastly, the improved profile of the components provides substantially unrestricted flow of the product from the compression chamber to the discharge orifice.
Finally, the present invention relates to a finger pump apparatus comprising a container for housing a desired product to be dispensed, said container being closed at one end and having a spout to facilitate dispensing of the product to be dispensed; a pump body having a base supporting an outer housing and an inner housing, and said outer housing and said inner housing at least partially defining a compression chamber therebetween; a closure supporting said pump body, and said closure sealingly engaging with the spout of the container; a piston being at least partially received within said pump body and being slidable relative to said pump body along said outer housing, said piston having an annular lip for providing a sealing engagement with the pump body, and said piston being provided with a poppet valve seat defining a piston outlet; an actuator being coupled to said piston outlet, and said actuator having a discharge outlet communicating with piston outlet for facilitating dispensing of a product; a poppet being accommodated by said inner housing, said poppet being biased away from said base of said pump body by a spring into engagement with said poppet valve seat to normally close said piston outlet and prevent flow of product therethrough, and said poppet, said base and said inner housing defining an interior cavity, and said interior cavity being provided with a ventilation port which allows said interior cavity, during operation of said poppet, to communicate with an interior of the container so that the interior cavity operates at ambient pressure; a passageway communicating with said compression chamber, said passageway including an inlet with a one-way valve which allows the product to flow along said passageway toward said compression chamber; and a dip tube coupling the inlet of the passageway to a base portion of said container to facilitate pumping of the product to be dispensed by the pump assembly.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1
is a diagrammatic front perspective view of a container supporting the improved pump assembly according to the present invention;
FIG. 2
is a diagrammatic cross-sectional view of the improved pump assembly, according to the present invention, shown in a static position without an overcap, an actuator, a closure, a liner, or a dip tube affixed thereto;
FIG. 3
is a diagrammatic cross-sectional view of the improved pump assembly, according to the present invention, shown in the static position with an actuator, a closure, a liner and a dip tube attached thereto;
FIG. 4
is a diagrammatic cross-sectional view, of the improved pump assembly of
FIG. 3
, shown in a partially depressed position in which the poppet has been sufficiently displaced from the poppet annular seat to commence dispensing of product;
FIG. 5
is a diagrammatic cross-sectional view of the improved pump assembly of
FIG. 3
showing the fully depressed position of the pump assembly; and
FIG. 6
is a diagrammatic cross-sectional view, of the improved pump assembly of
FIG. 3
, shown in its partially returned position in which the poppet is biased against the poppet annular seat to facilitate suction of the product into the compression chamber during the return stroke of the improved pump assembly.
DESCRIPTION OF THE PREFERRED EMBODIMENT
While this invention is susceptible to various embodiments, the specification and the accompanying drawings disclose only one specific form as an example of the invention. For ease of description, the pump assembly embodying this invention is described in the normal operating position, in terms such as: upper, lower, horizontal, etc., are used with reference to this position. It will be understood, however, that the pumps and components embodying this invention may be manufactured, stored, transported, used, and sold in an orientation other than the position described.
Turning first to
FIG. 1
, a brief description concerning the improved pump assembly
10
, according to the present invention, used in combination with a prior art container
12
will now be provided. As can be seen in this Figure, the container
12
is a generally closed plastic container which has a spout (not shown in detail) formed on the top surface of the container. The spout is provided with an external thread (not shown) and has an aperture or opening formed therein to provide communication with an interior of the container
12
. The container
12
accommodates a desired quantity of liquid, fluid or some other product to be dispensed
14
. The product to be dispensed
14
is typically supplied from an interior space or area of the container
12
, via a dip tube
16
, to an inlet of the pump assembly
10
. As is well known in the art, the bottom end of the dip tube
16
is normally submerged in the liquid or product when the container is in a generally in an upright orientation, as illustrated in
FIG. 1. A
further detailed description concerning the function of the dip tube
16
will be provided below.
The pump assembly
10
is provided with removable cap or closure
18
which accommodates a depressible actuator
20
that is movable relative to the closure
18
to facilitate actuation of the pump assembly
10
, and a further detailed description concerning the purpose of such depression will follow below. If desired, a removable hood or overcap
22
, can encase or enclose the actuator
20
to prevent inadvertent actuation thereof. The overcap
22
is hollow shell member and typically has a perimeter edge that has a friction fit with a hollow annular skirt
24
extending from a top surface of the closure
18
. As such overcap feature in conventional and well known in the art, a further detailed description concerning the same is not provided.
With reference now to
FIGS. 2-6
, a detailed description concerning the improved pump assembly
10
, according to the present invention, will now be provided. As can be seen in
FIGS. 3-6
, for example, the base portion of the closure
18
is provided with an annular flange
26
which is located to abut against a mating flange surface (not shown in detail) of the container
12
. In addition, the closure
18
is provided with a central through bore
28
extending through the closure
18
along a longitudinal axis L of the improved pump assembly
10
. An inwardly facing surface
29
of the base of the closure
18
is provided with an internal thread
30
(or some other conventional retaining recess, lip or mechanism) for engagement with a mating external thread (or some other mating conventional retaining recess, lip or mechanism) provided on the spout of the container
12
. The closure
18
is also provided with a substantially centrally located, radially inwardly extending horizontal closure annular flange
32
which separates a base portion of the closure
18
from the annular skirt
24
. The annular flange
32
facilitates retention of the various components of the improved pump assembly
10
as will be discussed below in further detail.
A top surface of the actuator
20
is provided with a finger recess
34
which is preferably shaped or contoured to facilitate engagement with an index finger of an operator. As such shaping or contouring feature is well known in the art, a further description concerning the same is not provided. The actuator
20
is further provided with a downwardly extending annular side wall
36
which has a diameter that is slightly less than an inside diameter of the annular skirt
24
of the closure
18
to allow the annular side wall
36
of the actuator
20
to move relative to the annular skirt
24
, e.g. to move in and out of the space encompassed by the annular skirt
24
of the closure
18
without excess friction or contact occurring between those two components. According to a preferred embodiment of the invention, there is a relative sliding motion between an outwardly facing surface of the annular side wall
36
and an inwardly facing surface of the annular skirt
24
to facilitate guiding the actuator
20
as it is actuated or depressed toward the closure
18
. Such sliding motion facilitates maintaining the actuator
20
in its correct upright dispensing orientation.
An internal longitudinal central bore
38
is formed within the interior of the actuator
20
and the central bore
38
, in turn, communicates with a transverse radial bore
40
. The transverse radial bore
40
terminates at an opening formed in an exterior surface of the actuator which is sealed or closed by insert member
42
. The insert member
42
has a discharged orifice
44
formed therein. The discharged orifice
44
facilitates dispensing of the product to the dispensed
14
out of the actuator into the external environment. The insert member
42
is received within the transverse radial bore
40
and an outer periphery of the insert member
42
has a friction fit with an inner wall defining the transverse radial bore
40
to permanently retain the insert member
42
therein. An inwardly facing surface, located on the base of the insert member
42
, engages with an outwardly facing planar end surface of a central post
46
accommodated within the radial bore
40
. The end surface of the post
46
has a plurality of conventional inwardly directed channels
48
which lead to a conventional mixing chamber (not separately numbered) centrally formed on the end surface of the post
46
. It will be apparent to one skilled in the art that the plurality of inwardly directed channels
48
and the mixing chamber may also be located on and supported by the inwardly facing base surface of the insert member
42
, instead of the post
46
, for engagement with a substantially flat end surface of the post
46
. The mixing chamber directly communicates with the discharge orifice
44
for dispensing the throughly mixed and/or swirled product to be dispensed
14
out through the discharge orifice
44
. As this dispensing arrangement is conventional and well known in the art, a further detailed description concerning the same is not provided.
The annular flange
32
of the closure
18
mates with an annular flange
50
of a turret
52
(see
FIG. 3
for example) and also supports a gasket or liner
58
. The gasket or liner
58
is provided with a central aperture and is employed for biasing the annular flange
50
of the turret
52
against the annular flange
32
of the closure
18
, when the closure
18
is secured to the container
12
. The annular flange
32
of the closure
18
and the gasket or liner
58
sandwich the annular flange
50
of the turret
52
therebetween as the closure
18
is secured to the spout of the container. Such sandwiching arrangement is conventional and well known in the art.
An annular side wall
54
of the turret
52
extends through a central aperture, provided in the annular flange
32
, and the annular side wall
54
extends substantially parallel to the annular skirt
24
of the closure
18
and is spaced therefrom a sufficient distance to allow the annular side wall
36
of the actuator
20
to be readily received therebetween without an undue interference from the side wall
54
during operation of the actuator
20
. A top free end portion of the turret
52
is provided with an annular retaining edge
56
which first extends radially inwardly and then extends downwardly a short distance, along the longitudinal axis L, toward the base of the closure
18
. A further detailed description concerning the purpose of the retaining edge
56
will be provided below. An annular lip
59
(see
FIG. 2
) is provided on an inwardly facing surface of the annular side wall
54
of the turret
52
to facilitate retention of a pump body
60
and a further description concerning the purpose of the same will follow.
The pump body
60
, as can be seen in further detail with reference to
FIG. 2
, comprises an outer cylindrical housing
62
which is connected to a base
64
of the pump body
60
to form a single unitary component or structure. An inner cylindrical housing
66
is integrally connected to the base
64
, of the pump body
60
, and the inner cylindrical housing
66
is located concentric with the outer cylindrical housing
62
but spaced therefrom. An exterior surface of the pump body
60
supports an annular nub
69
which is located to engage with the annular lip
59
of the turret
52
and secure the pump body
60
to the turret
52
. A lower portion of the pump body
60
is provided with a cylindrical extension
70
having an inlet aperture
72
formed in a base end surface thereof. A first end of the dip tube
16
is frictionally received and retained within the inlet aperture
72
, as is conventionally done in this art.
The inlet aperture
72
communicates with a first portion of a compression chamber
68
, formed between an exterior surface of the inner cylindrical housing
66
and an inwardly facing surface of the outer cylindrical housing
62
, via a longitudinal passageway
74
. The longitudinal passageway
74
extends parallel to but is spaced radially from the longitudinal axis L of the pump assembly. A one way valve is located along the longitudinal passageway
74
and the one-way valve comprises a metal ball
76
that is captively retained within a cage
78
. The cage
78
allows limited to and for movement of the ball
76
to facilitate opening and closing of the one-way valve. This one-way valve allows the product to flow along the longitudinal passageway
74
when the ball
76
is spaced from an annular ball seat
80
(see FIG.
6
). The ball
76
normally rests, as can be seen in
FIGS. 3-5
, against the annular ball seat
80
to shut off product flow through the longitudinal passageway
74
. Prior to inserting the dip tube
16
within the inlet aperture
72
, the metal ball
76
is forced into the inlet aperture
72
, and urged past the annular ball seat
80
into the cage
78
where the ball
76
is thereafter permanently retained and utilized to operate the one-way valve.
It is to be appreciated that the ball
76
is normally held by gravity in a sealing position over the opening defined by the annular ball seat
80
so as to prevent the compressed liquid from being forced back down into the dip tube
16
. During actuation of the actuator, i.e. either during priming of the pump or dispensing of product, the generated pressure within the compression chamber additional serves to hold the ball
76
in its sealing engagement against the annular ball seat
80
. A further detailed description concerning the purposed of the same will follow below.
A piston
82
is at least partially accommodated within the body
60
and the piston
82
is slidably movable relative to the body
60
. A first lower end
84
of the piston
82
is provided with an annular sealing lip
86
, having an outer circumference slightly larger than the inner dimension of the outer housing
62
to provide a tight sealing engagement between the annular sealing lip
86
and the inner surface of the outer housing
62
. During operation of the piston
82
, as will be described below in further detail, the pressure generated within the compression chamber
86
assists with forcing the annular sealing lip
86
of the piston
82
into sealing engagement with the inwardly facing surface of the outer cylindrical housing
62
. An exterior surface of the piston
82
, adjacent the annular sealing lip
86
, is provided with an annular shoulder
88
which abuts against the annular retaining edge
56
of the turret
52
to captively retain at least the first lower end
84
of the piston
82
within the pump body
60
.
The piston
82
is a generally hollow member which has an exterior side wall that may taper slightly from the first lower end
84
to a second remote end
90
. A piston outlet
92
is formed adjacent the second remote end
90
of the piston
82
. The second remote end
90
of the piston
82
, located adjacent the piston outlet
92
, is provided with a reduced diameter annular cylindrical side wall
94
which is sized to be frictionally received within the central bore
38
of the actuator
20
and provide a secure retaining engagement between the second remote end
90
of the piston
82
and the actuator
20
. An annular surface of the piston
82
, defining the piston outlet
92
, forms the poppet valve seat
96
. The piston outlet
92
is normally closed by a shoulder
106
of an elongate generally cylindrical poppet
98
which is biased against the poppet valve seat
96
via a spring
104
. When the cylindrical poppet
98
becomes spaced from the poppet valve seat
96
, during actuation of the pump assembly, the piston outlet
92
is opened and allows the product to be dispensed
14
to flow from the compression chamber
68
to the central bore
38
of the actuator
20
, and a further detailed description concerning the same will be provided below.
As stated above, a first portion of the compression chamber
68
is formed between the inner cylindrical housing
66
and the outer cylindrical housing
62
. A remaining second portion of the compression chamber
68
is formed between an inwardly facing surface of the piston
82
and an exterior surface of the poppet
98
. The hollow interior dimension of the piston
82
is slightly larger than the outer diameter of the inner cylindrical housing
66
and either the piston
82
and/or the inner cylindrical housing
66
may have a channel(s) formed thereon so that the first portion of the compression chamber
68
is in constant communication with the remainder of the compression chamber
68
regardless of the position of the piston
82
relative to the inner cylindrical housing
66
.
The cylindrical poppet
98
is accommodated within a central cavity
100
defined by the inner cylindrical housing
66
. The poppet
98
is a solid elongate generally cylindrical member which supports an annular sealing and guide surface
102
adjacent a first lower end thereof. The annular sealing and guide surface
102
is sized to have an slight interference sliding fit with the inwardly facing surface of the inner cylindrical housing
66
. The annular sealing and guide surface
102
slides along the inwardly facing surface of the inner cylindrical housing
66
, in a sealed manner during operation of the pump assembly, and maintains the poppet
98
aligned with respect to the longitudinal axis L of the pump assembly
10
. The poppet
98
is biased into a normally closed position, via a spring
104
accommodated within an interior central cavity
100
, so that the shoulder
106
of the poppet
98
abuts against the poppet valve seat
96
, formed on the piston
82
, to shut off flow through the piston outlet
92
. As can be seen in
FIG. 2
, for example, the poppet
98
has a tapered or smaller constant diameter appendage
108
that extends through the piston outlet
92
and facilitates maintaining proper alignment of the poppet
98
with respect to the outlet
92
during operation of the pump assembly.
The base
64
of the central cavity
100
, accommodating the spring
104
, is provided with a ventilation port
110
which provides communication between the interior cavity
100
and an interior space of the container
12
to ventilate the cavity so that the central cavity
100
is at ambient pressure. The ventilation port
110
prevents the creation of either excess pressure or vacuum in the central cavity
100
during operation of the pump assembly
10
. A lower most portion of the poppet
98
, opposite the appendage
108
, is provided with a cylindrical extension
112
which receives one end of the spring
104
and further facilitates proper alignment and engagement between the poppet
98
and the spring
104
.
In a preferred form of the invention, a lower inwardly facing surface of the inner cylindrical housing
66
is provided with at least one nub or some other protrusion
114
so that when the annular sealing guiding surface
102
of the poppet
98
engages with the nub or other protrusion
114
, the remaining pressure in the compression chamber
68
is relieved and flows downward through the central cavity
100
and out through the ventilation port
110
, provided in the base
64
, into the interior space of the container
12
. It is to be appreciated that the nub or other protrusion
114
is formed on an inwardly facing surface of the inner cylindrical housing
66
at a location near the end of the stroke of the poppet
98
, e.g. after the poppet has moved about 95% to 98% of is normal operating stroke within the inner cylindrical housing
66
, so as not to compromise significantly the pumping efficiency of the compression chamber
68
.
The use of the protrusion or nub
114
is very useful in “priming” the air normally contained within the compression chamber
68
of the pump assembly following the manufacturing process. Since air is a compressible fluid, the compressed air typically may not generate, even after the full compression stroke of the actuator
20
, a sufficient pressure to bias the poppet shoulder
106
away from the poppet valve seat
96
and thereby allow discharge of the compressed air out of the compression chamber
68
into the central bore
38
of the actuator
20
. According to the present invention, if the actuator
20
is substantially completely depressed and the poppet shoulder
106
still has not been biased away from the poppet valve seat
96
to thereby open the piston outlet
92
, the air is immediately released by the breach in the seal formed between the annular sealing and guide surface
102
and the inwardly facing surface of the inner cylindrical housing
66
, once the annular sealing and guide surface
102
engages with the nub or the protrusion
114
. This released air is conveyed through the central cavity
100
and out the ventilation port
110
. On the return stroke of the actuator
20
, however, as soon as the annular sealing and guide surface
102
clears the nub or the protrusion
114
and again establishes a seal with the inner cylindrical housing
66
, a siphoning action is created within the compression chamber
68
and a quantity of the product to be dispensed
14
is siphoned, via the dip tube
16
and passageway
74
, toward the compression chamber
68
. This siphoned product will eventually flow into the compression chamber
68
where the product, which is generally an incompressible fluid, will actuate the poppet
98
in its intended dispensing manner after a sufficient number, e.g. four (4), of priming strokes.
It is to be appreciated that if replacement air is not allowed to enter inside the container
12
and replace the volume of dispensed product
14
, during normal operation of the pump, the container
12
will progressively become evacuated and eventually deform inwardly and/or collapse once a substantial portion of the product to be dispensed is sprayed. To alleviate this problem, at least one groove
116
is provided along either an exterior surface of the body
60
or an inwardly facing surface of the turret
52
. This groove
116
is normally sealed off from the external environment by the piston shoulder
88
engaging with the annular retaining edge
56
to provide a seal therebetween. Once the piston
82
is sufficiently depressed, the exterior surface of the piston
82
is slightly spaced from the annular retaining edge
56
to allow ambient air to flow along the exterior surface of the piston
82
and around the retaining edge
56
and down along the groove
116
, located between the exterior surface of the body
60
and the inwardly facing surface of the turret
52
, to replace the volume of the product which was just dispensed by the actuator
20
. This ventilation groove
116
also maintains the pressure inside the container at substantially the same pressure as the external surrounding environment.
Now that a detailed description concerning the basic components of the pump assembly, according to the present invention, were provided, a detailed description concerning actuation of the pump assembly will now be described.
Initially the pump assembly
10
is first installed on a spout of a desired container
12
, containing a product to be dispensed
14
, by engaging the threads
30
of the closure
18
with a mating thread, or some other conventional retaining mechanism, provided on an exterior surface of the spout of the container
12
. Once this has occurred, the dip tube
16
of the pump assembly is submerged within the product to be dispensed
14
such that an inlet of the dip tube is located adjacent a base of the container
12
. The pump assembly
10
is now ready for actuation.
When actuation is desired, the operator places his or her index finger on the finger recess
34
and depresses the actuator
20
, in the direction of arrow A of
FIG. 3
, so as to bias the actuator
20
downwardly along the longitudinal axis L toward the closure
18
. Such depression of the actuator
20
, in turn, causes a depression of the piston
82
which results in the annular sealing lip
86
sliding along the inwardly facing surface of the outer cylindrical housing
62
in an sealed manner toward the base
64
of the body
60
. This action causes the product to be dispensed
14
, contained within the compression chamber
68
, to come under pressure, i.e. it is to be noted that a liquid is generally incompressible. As the pressure of the product to be dispensed increases, this increase in pressure serves to bias the ball
76
against the annular ball seat
80
and thereby prevent the escape of any product downwardly back along the dip tube
16
. As noted above, the inwardly facing surface of the piston
82
is spaced a sufficient distance away from the outwardly facing surface of the inner cylindrical housing
66
to allow the product to be dispensed
14
to continuously flow therebetween regardless of the position of the piston
82
. Once the pressure within the compression chamber
68
increases to a sufficient pressure, e.g. an operating pressure of about 130 psi, the generated pressure of the product to be dispensed
14
overcomes the biasing force of the spring
104
and forces the poppet
98
downwardly toward the base
64
of the interior cavity
100
against the action of the spring
104
. This movement results in a compression of the spring
104
which allows the poppet shoulder
106
to separate away from the poppet valve seat
96
and thereby establishes a product flow path through the piston outlet
92
, as can be seen in FIG.
4
.
Once the poppet shoulder
106
is sufficiently spaced from the poppet valve seat
96
, the product to be dispensed
14
rushes through the piston outlet
92
and flows upwardly through the central bore
38
, the radially bore
40
, the inwardly directed channels
48
and is dispensed out through the discharge orifice
44
in a manner which generates a substantially uniform discharge spray configuration from the actuator
20
. The piston
82
continues to force the product to be dispensed
14
out through the actuator
20
, during further downward motion of the actuator in the direction of arrow A, until the annular lip
86
of the piston
82
abuts against the base
64
of the body
60
, as seen in FIG.
5
. Once the pump assembly is in its fully depressed position, an inwardly facing surface of the base
64
of pump body
60
is contoured to closely accommodate and substantially mirror the inwardly facing surface or profile of the annular sealing lip
86
of the piston
82
and thereby minimize the amount of the product to be dispensed
14
still remaining in the compression chamber
68
, e.g. the volume of the compression chamber is minimized by this arrangement. As is apparent from
FIG. 5
, the volume of the compression chamber
68
has been significantly reduced so that a substantial portion of the product to be dispensed
14
, that was previously stored within the compression chamber
68
, has been dispensed by the actuation stroke of the actuator
20
.
It is to be appreciated when the annular sealing and guide surface
102
, seen in
FIG. 5
, engages with the nub or the protrusion
114
, formed near a lower portion of the inner cylindrical housing
66
, the seal therebetween is breached and most of the remaining product to be dispensed, or air during initial priming of the pump assembly, is conveyed through the interior cavity
100
and out the ventilation port
110
to quickly relieve the generated pressure of the compression chamber
68
.
Once the actuation stroke is completed, the finger actuation pressure of the operator is relieved, e.g. the finger of the operator is removed from the finger recess
34
. Thereafter, the spring
104
immediately biases the poppet
98
, in the direction of arrow B of
FIG. 6
, toward and against the poppet valve seat
96
of the piston
82
to quickly close the piston outlet
92
and thereby prevent the further flow of the product to be dispensed
14
therethrough. The spring
104
also biases, due to biasing of the poppet
98
in the direction of arrow B, the piston
82
and the actuator
20
in an upward direction away from the closure
18
. During this return stroke of the pump assembly
10
, additional product to be dispensed
14
is siphoned into the inlet formed in the second end of the dip tube
16
. The siphoned product to be dispensed
14
flows along the dip tube
16
and moves or displaces the ball
76
away from the ball seat
80
to allow passage of the product to be dispensed
14
therepast along the longitudinal passageway
74
.
It is to be appreciated that the cage
78
captively retains the ball
76
, e.g. opens this one-way valve but retains the ball
76
so that the ball
76
may fall, due to the effects of gravity, back on the ball valve seat
80
following completion of the pump assembly return stroke to close this one-way valve. The product to be dispensed
14
continues to flow along longitudinal passageway
74
into the compression chamber
68
where the product to be dispensed
14
is accumulated and stored, as can be seen in FIG.
3
. Once the spring
104
has biased the poppet
98
, in the direction of arrow B, a sufficient distance such that the shoulder
88
of the piston
82
abuts against the annular retaining edge
56
, the ball
76
is again allowed to settle on ball valve seat
80
to thereby prevent further flow and allow pressurization of the compression chamber
68
when the actuator
20
is again depressed.
According to a preferred form of the invention, the compression chamber which has a maximum transverse dimension or diameter of between 0.225 and 0.275 inches, and more preferably a diameter of about 0.250 inches and the piston has a stroke length of between 0.275 and about 0.325 inches, and more preferably a piston stroke length of about 0.300 inches. This results in a compression chamber diameter to piston stroke ratio of between about 4 to 5 and about 2 to 3 which facilitates achievement of an operating pressure of approximately 130 psi or so.
According to the design of the present invention, if, during depression of the actuator
20
toward the closure
18
, the finger actuation pressure discontinues for any reason, once flow has been established through the piston outlet
92
, the spring
104
will immediately bias the poppet
98
in the direction of arrow B of the
FIG. 6
, toward and against the poppet valve seat
96
. This biasing action quickly closes the piston outlet
92
and thereby prevents the further flow of product to be dispensed
14
therethrough.
According to the present invention, passageway
74
leading to the compression chamber
68
extends along a second longitudinal axis LP which is off set with respect to the longitudinal axis L of the pump assembly but extends substantially parallel thereto. This arrangement facilitates venting of the base
64
of the central cavity
100
to the interior space of the container
12
so that the central cavity
100
operates at ambient pressure or to some other pressure other than the operating pressure of the compression chamber.
Since certain changes may be made in the above described finger operated pump assembly, without departing from the spirit and scope of the invention herein involved, it is intended that all of the subject matter of the above description or shown in the accompanying drawings shall be interpreted merely as examples illustrating the inventive concept herein and shall not be construed as limiting the invention.
Claims
- 1. A finger pump assembly comprising:a pump body having a base supporting an outer housing and an inner housing, said outer housing and said inner housing being coaxial with one another and said outer housing and said inner housing at least partially defining a compression chamber therebetween; a closure supporting said pump body, and said closure having a mechanism for facilitating engagement with a spout of a container; a piston being at least partially received within said pump body and being slidable relative to said pump body between the coaxial outer and inner housings and along said outer housing, said piston having an annular lip for providing a sealing engagement with the pump body, and said piston being provided with a poppet valve seat defining a piston outlet; an actuator being coupled to said piston outlet, and said actuator having a discharge outlet communicating with said piston outlet for facilitating dispensing of a product; a poppet being at least partially accommodated by the inner housing, said poppet being biased away from said base of said pump body by a spring into engagement with said poppet valve seat to normally close said piston outlet and prevent flow of product therethrough, and said poppet, said base and said inner housing defining an interior cavity, and said interior cavity being provided with a ventilation port which allows said interior cavity, during operation of said poppet, to operate at ambient pressure; and a passageway communicating directly with said compression chamber, said passageway having an inlet and a one-way valve which allows the product to flow along said passageway and directly into said compression chamber without passing through the interior cavity.
- 2. The finger pump assembly according to claim 1, wherein said poppet has an annular sealing and guide surface to facilitate sliding sealing engagement of the poppet along an inwardly facing surface of said inner housing.
- 3. The finger pump assembly according to claim 1, wherein said poppet is provided with a poppet shoulder for engaging with said poppet valve seat which defines the piston outlet, and said poppet has an appendage which extends through said piston outlet to facilitate alignment of said poppet with said piston outlet.
- 4. The finger pump assembly according to claim 1, wherein an end of said poppet, received within said inner housing, supports an extension which engages with a first end of said spring to facilitate orientation of said poppet along a longitudinal axis of said finger pump assembly.
- 5. The finger pump assembly according to claim 1, wherein said pump body is coupled to a turret and said turret is connected to said closure, and a remote free end of said closure supports an annular skirt which extends away from a base portion of said closure.
- 6. The finger pump assembly according to claim 5, wherein said turret has an annular sidewall and a free end portion of said annular sidewall is provided with an annular retaining edge for securely connecting said pump body to said turret.
- 7. The finger pump assembly according to claim 5, wherein said actuator is provided with an annular sidewall which engages with said annular skirt of said closure to facilitate actuation of said actuator along a longitudinal axis of said pump assembly.
- 8. The finger pump assembly according to claim 5, wherein said closure is provided with an annular flange, and said turret is provided with a mating annular flange, and said annular flange of said closure and a gasket sandwich said annular flange of said turret therebetween to facilitate a sealing engagement of said finger pump assembly with a desired container.
- 9. The finger pump assembly according to claim 1, wherein said actuator has a central bore which communicates with said discharge orifice, and said piston has an annular housing side wall which frictionally engages with said central bore of said actuator to couple said piston to said actuator and facilitate the supply of the product to be dispensed from said piston to said discharge orifice.
- 10. The finger pump assembly according to claim 1, wherein an inwardly facing surface of said inner housing is provided with at least one nub to facilitate relieving the pressure generated within the compression chamber once the poppet has been substantially completely displaced along an inwardly facing surface of said inner housing, and the relieved pressure is vented through the interior cavity and out through the ventilation port provided in the base of the pump body.
- 11. The finger pump assembly according to claim 5, wherein at least one groove is provided between an exterior surface of said pump body and an inwardly facing surface of said turret to allow an equalization in pressure, once the finger pump assembly is connected to a container and operated, to prevent the container attached to the finger pump assembly from becoming at least partially evacuated.
- 12. The finger pump assembly according to claim 1, wherein the passageway, communicating with said compression chamber, extends substantially parallel to a longitudinal axis of the pump assembly but is radially spaced from the longitudinal axis.
- 13. The finger pump assembly according to claim 12, wherein the valve is located along said passageway communicating with said compression chamber, and said valve comprises a ball captively retained within a cage with said ball normally resting upon a ball valve seat to prevent flow of product along said passageway and, during a siphoning action of said pump assembly, said ball is displaced from said valve seat to allow the flow of product therethrough.
- 14. The finger pump assembly according to claim 12, wherein a dip tube is coupled the inlet of the passageway to facilitate siphoning of the product to be dispensed from a base portion of a container.
- 15. A finger pump apparatus comprising:a container for housing a desired product to be dispensed, said container being closed at one end and having a spout to facilitate dispensing of the product to be dispensed; a pump body having a base supporting an outer housing and an inner housing, said outer housing and said inner housing being coaxial with one another and said outer housing and said inner housing at least partially defining a compression chamber therebetween; a closure supporting said pump body, and said closure sealingly engaging with the spout of the container; a piston being at least partially received within said pump body and being slidable relative to said pump body between the coaxial outer and inner housings and along said outer housing, said piston having an annular lip for providing a sealing engagement with the pump body, and said piston being provided with a poppet valve seat defining a piston outlet; an actuator being coupled to said piston outlet, and said actuator having a discharge outlet communicating with said piston outlet for facilitating dispensing of a product; a poppet being at least partially accommodated by said inner housing, said poppet being biased away from said base of said pump body by a spring into engagement with said poppet valve seat to normally close said piston outlet and prevent flow of product therethrough, and said poppet, said base and said inner housing defining an interior cavity, and said interior cavity being provided with a ventilation port which allows said interior cavity, during operation of said poppet, to communicate with an interior of the container so that the interior cavity operates at ambient pressure; a passageway communicating directly with said compression chamber, said passageway having an inlet and a one-way valve which allows the product to flow along said passageway and directly into said compression chamber without gassing through the interior cavity; and a dip tube coupling the inlet of the passageway to a base portion of said container to facilitate siphoning of the product to be dispensed by the pump assembly from an interior of the container.
- 16. The finger pump apparatus according to claim 15, wherein said poppet has an annular sealing and guide surface to facilitate sliding sealing engagement of the poppet along an inwardly facing surface of said inner housing;said poppet is provided with a poppet shoulder for engaging with said poppet valve seat which defines the piston outlet, and said poppet has an appendage which extends through said piston outlet to facilitate alignment of said poppet with said piston outlet; and an end of said poppet, received within said inner housing, supports an extension which engages with a first end of said spring to facilitate orientation of said poppet along a longitudinal axis of said finger pump assembly.
- 17. The finger pump apparatus according to claim 15, wherein said pump body is coupled to a turret and said turret is connected to said closure, and a remote free end of said closure supports an annular skirt which extends away from said base portion of said closure;said turret has an annular sidewall and a free end portion of said annular sidewall is provided with an annular retaining edge for securely connecting said pump body to said turret; and said actuator is provided with an annular sidewall which engages with said annular skirt of said closure to facilitate actuation of said actuator.
- 18. The finger pump apparatus according to claim 15, wherein said actuator has a central bore which communicates with said discharge orifice, and said piston has an annular housing side wall which frictionally engages with said central bore of said actuator to couple said piston to said actuator and facilitate the supply of the product to be dispensed from said piston to said discharge orifice.
- 19. The finger pump apparatus according to claim 15, wherein the passageway, communicating with said compression chamber, extends substantially parallel to a longitudinal axis of the pump assembly but is radially spaced from the longitudinal axis.
- 20. The finger pump apparatus according to claim 15, wherein at least one groove is provided between an exterior surface of said pump body and an inwardly facing surface of said turret to allow an equalization in pressure and prevent said container from becoming at least partially evacuated during operation of said finger pump apparatus.
- 21. A single spring finger pump assembly comprising:a pump body defining a longitudinal axis and having a base supporting an outer housing and an inner housing, said outer housing and said inner housing being coaxial with one another and with the longitudinal axis and said outer housing and said inner housing at least partially defining a compression chamber therebetween; a closure supporting said pump body, and said closure having a mechanism for facilitating engagement with a spout of a container; a piston being at least partially received within said pump body and being slidable relative to said pump body between the coaxial outer and inner housings and along said outer housing, said piston having an annular lip for providing a sealing engagement with the pump body, and said piston being provided with a poppet valve seat defining a piston outlet; an actuator being coupled to said piston outlet, and said actuator having a discharge outlet communicating with said piston outlet for facilitating dispensing of a product; a poppet being at least partially accommodated by the inner housing, said poppet being biased away from said base of said pump body by a spring into engagement with said poppet valve seat to normally close said piston outlet and prevent flow of product therethrough, and said poppet, said base and said inner housing defining an interior cavity, and said interior cavity being provided with a ventilation port which allows said interior cavity, during operation of said poppet, to operate constantly at ambient pressure; and a passageway communicating directly with said compression chamber, said passageway having an inlet and a one-way valve which allows the product to flow along said passageway and directly into said compression chamber without passing through the interior cavity, and the passageway extending parallel to the longitudinal axis but being offset from the longitudinal axis.
US Referenced Citations (12)