U.S. patent number 3,888,466 [Application Number 05/357,306] was granted by the patent office on 1975-06-10 for agitating apparatus.
This patent grant is currently assigned to The Coca-Cola Company. Invention is credited to Jason K. Sedam.
United States Patent |
3,888,466 |
Sedam |
June 10, 1975 |
Agitating apparatus
Abstract
An agitating apparatus is described wherein an improved agitator
system is employed in cooperation with a container so as to
thoroughly mix a dispensable fluid which is positioned within the
container and wherein the container has a removable top or cover
portion. The agitator system includes a magnetic coupling
arrangement associated therewith which is driven by a fluid motor
impeller. The impeller is driven by a fluid which is customarily
available at little or no cost and which is further utilized in the
system or subsequently dispensed with the concentrate so as to
eliminate the requirement of discarding the same. A removable
stirring element is suspended from the container top or cover
portion in order to prevent the same from being lost or being
interferred with during the cleaning or replacement of the
container.
Inventors: |
Sedam; Jason K. (Dunwoody,
GA) |
Assignee: |
The Coca-Cola Company (Atlanta,
GA)
|
Family
ID: |
26809418 |
Appl.
No.: |
05/357,306 |
Filed: |
May 7, 1973 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
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111959 |
Feb 2, 1971 |
3744764 |
|
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Current U.S.
Class: |
222/394; 222/226;
366/274; 222/335; 366/279 |
Current CPC
Class: |
B01F
13/0827 (20130101); B01F 13/089 (20130101) |
Current International
Class: |
B01F
13/08 (20060101); B01F 13/00 (20060101); B01f
013/08 () |
Field of
Search: |
;259/DIG.46,7,8,10,42,44,46,108,110 ;222/129.1,226,335 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Hornsby; Harvey C.
Assistant Examiner: Coe; Phillip R.
Attorney, Agent or Firm: Brooks; W. Dexter
Parent Case Text
This is a division of application Ser. No. 111,959, filed Feb. 2,
1971, and now U.S. Pat. No, 3,744,764.
Claims
The embodiments of the invention in which an exclusive property
right or privilege is claimed are defined as follows:
1. An agitator dispenser having a container for holding a fluid to
be dispensed as a consumable beverage wherein:
Agitating means are provided for agitating a dispensable fluid in
the container and wherein driving means are provided for driving
the agitating means, torque being applied to the driving means by
the same dispensable fluid after it has been withdrawn from the
container, and further wherein said agitating means comprises a
magnetic element immersed within the container holding the fluid so
as to form a magnetic coupling with said driving means when said
torque is applied to the driving means.
2. An agitator dispenser as defined in claim 1, wherein the
dispensable fluid in the container comprises a first liquid of
citrus juice which is dispensed with a second liquid through a
serving nozzle means after the first liquid has been withdrawn from
the container and applied torque to the driving means.
3. An agitator dispenser as defined in claim 1, wherein the
container is pressurized and includes a dip tube within the
container for withdrawal of the dispensable fluid and said
dispensable fluid comprising a pre-mix fluid.
4. An agitator dispenser as defined in claim 1, wherein the
dispensable fluid in the container comprises a first fluid of
beverage syrup and wherein the syrup after it has been withdrawn
from the container and applied torque to the driving means, is
discharged through a serving nozzle with a second fluid of
carbonated water.
5. An agitator dispenser as defined in claim 1, wherein the
dispensable fluid in the container comprises a first fluid of
beverage syrup and wherein the syrup after it has been withdrawn
from the container is combined and discharged through a serving
nozzle with a second fluid of carbonated water after the second
fluid has applied torque to the driving means.
Description
FIELD OF THE INVENTION
This invention relates to an improved agitator system that is
employed in cooperation with a container so as to thoroughly mix a
dispensable fluid held in the container. More specifically, this
invention relates to an improved agitator system including a
magnetic coupling associated therewith which is driven by a fluid
motor impeller. The dispensable fluid is used to drive the impeller
prior to being subsequently conditioned and discharged from the
container with a concentrate or extract.
DESCRIPTION OF PRIOR ART
There are presently available a wide variety of dispensing devices
that include an agitator assembly for mixing a dispensable liquid;
however, many of these agitator assemblies have not been found
totally acceptable because of various reasons.
For example, one problem in conventional dispensers which employ a
beverage or frozen concentrates to be dispensed, such as fresh
fruit juices, coffee, tea, or syrup, is the necessity of keeping
the concentrate cold to a certain extent to be palatable. This
normally has been done by the use of a refrigerating element which
is placed in close proximity to the dispenser in order to maintain
or provide a cold environment for the concentrate. Further, in
order to prevent the constituents of the concentrate from settling
on the bottom of the dispenser container, or stratifying therein,
revolving paddles or circulating pumps have been employed in the
container for agitating the concentrate. This form of agitation has
been used in the beverage industry but frequently not found
acceptable since "dead spots" will occur in the region of the
dispensing tap and on the bottom of the container. The liquid
trapped in these "dead spots" not only becomes unpalatable, but
tends to spoil more quickly than the cooler mixed liquid and causes
deposits of scum or sediment to form within the container. Also,
the circulation is inadequate next to the wall of the container,
giving rise to a ring of scum thereon which is unsightly, hard to
remove and difficult to sterilize. Because of and to try to
overcome these problems, the agitator assemblies normally have been
operated continuously.
Another problem encountered in paddle-type stirring mechanisms and
conventional circulation pumps is the leakage of oil through the
packing of the drive shafts. As is obviously known, the leakage of
a very minute quantity of such oil in the beverage itself makes it
unfit for consumption.
A further disadvantage in conventional dispensers is that they
normally employ an electric motor for driving the agitator
assembly. This arrangement has not been found acceptable and should
not be used because of the hazards attendant the generation of
sparks which may occur upon deterioration of elastomers and
insulating material used in the sealing of the electrical
components. Aside from the sparking aspect, a further disadvantage
is their large size and bulkiness which greatly restricts their
use. For example, the use of the electrical motor for driving the
agitator assembly greatly hinders the production of portable
beverage dispensers due to its space requirements. Additionally, it
is well recognized that electrical motors by their very nature
develop and produce heat which may be deleterious to the
dispensable liquids or constituents.
Accordingly, there has arisen a need in the industry for the
production of a suitable agitator dispenser apparatus, preferably
of simple construction, whereby the rate of agitation may be
controlled and the concentrate will be subjected to a uniform,
complete and thorough agitation regardless of the container's
configuration or the particular constituents of the liquid
contained therein.
SUMMARY OF INVENTION
The agitator apparatus of the present invention satisfies these
needs by providing an improved magnetic coupling between the
agitator element and the fluid motor impeller. In addition, the
fluid motor impeller itself is an improved impeller arrangement
which utilizes the hydraulic pressure of the dispensable fluid
itself as the driving force or source of power therefor. After the
dispensable fluid leaves the impeller, the same may be subsequently
conditioned by either being heated or cooled prior to being
dispensed with or as a liquid such as frozen orange juice, coffee,
tea, syrup, hot cocoa, pre-mixed beverage, carbonated beverage or
preparations for making the same. Thus, a more compact, efficient,
simply constructed and unique dispenser apparatus is provided
incorporating an improved agitator assembly whereby the product
components are utilized in the system and nothing must be
discarded.
OBJECTS OF INVENTION
It is, accordingly, an object of this invention to provide an
improved agitator apparatus.
Another object of the invention is to provide an improved agitator
apparatus incorporating a magnetic coupling generally of the type
described which is low in cost and of simple, reliable
construction.
Another object of the invention is to provide an agitator dispenser
which may be easily disassembled and cleaned in order to meet
sanitation requirements or purposes.
Another object of the invention is to provide an agitator within a
liquid or beverage container which may be driven by magnetic means
that do not require passage of a shaft through a wall of the
container, thus eliminating the need to seal the shaft against
leakage.
Another object of the invention is to provide an improved fluid
motor impeller arrangement for driving the magnetic coupling and
wherein the driving force therefor is customarily available for use
at little or no cost.
Another object of the present invention is to provide a more
compact agitated dispensing system by employing the dispensable
liquid as the driving fluid for the fluid motor impeller and
related magnetic coupling arrangement of the agitator apparatus to
ensure that all product components are utilized in the system and
nothing is required to be discarded. This alleviates the
requirement for a separate driving force for actuating the agitator
which normally has to be discarded after the impeller driving
operation.
Another object of the present invention is to provide an agitator
dispenser which mixes the liquid uniformly, which maintains
circulation in desired parts of the storage and dispensing system
during intermittant operation thereof, and which eliminates the
formation of scum or sediment on the walls of the container.
These and other objects and features of this invention along with
its incident advantages will be better understood and appreciated
from the following detailed description of an embodiment thereof,
selected for purposes of illustration only and shown in the
accompanying drawings, in which:
BRIEF DESCRIPTION OF DRAWING
FIG. 1 is a schematic view, partly in section and partly broken
away, showing a beverage dispenser system including an improved
agitator assembly for the beverage dispenser in accordance with
this invention;
FIG. 2 is an enlarged side view in section showing details of a
concentrate tank housing an agitator assembly embodied in this
invention;
FIG. 3 is an enlarged top section view, partly broken away, showing
details of a concentrate tank housing, with the tank cover removed,
embodied in this invention;
FIG. 4 is an enlarged side view in section showing details of a
concentrate tank housing an alternative embodiment of the agitator
assembly embodied in this invention;
FIG. 5 is an enlarged top section view taken along Line 5--5 of
FIG. 4, partly broken away, showing details of the alternative
embodiment.
DETAILED DESCRIPTION OF INVENTION
Referring to the drawings in detail, a beverage dispenser
incorporating this invention is illustrated in FIGS. 1-3. It will
be understood that a housing, not shown, may be provided for
supporting and enclosing various operating components
(schematically illustrated in FIG. 1) in operative assembled
relation. While the dispenser is capable of quickly and positively
discharging fluids of various types in different applications, it
is particularly suited for dispensing both hot and cold liquid
beverages at the same time. The term beverage will be understood to
include a variety of consumable liquids such as coffee, soup, beer,
fruit juices such as orange juice, vegetable juices, milk, tea,
pre-mixed beverages, carbonated beverages, and similar liquid foods
and drinks. Separate metered quantities of either hot or cold
liquids may be dispensed from each metering compartment of the
dispenser, but for the purposes of illustration, the embodiment
shown in FIGS. 1-3 will be described in connection with the
metering and dispensing of separate slugs of hot water and cold
concentrate, or syrup, to provide a blended hot beverage.
To effect precision metering and simultaneous discharge of water
and beverage concentrate in precisely proportioned quantities for a
single serving, a two stroke cycle metering pump 10 is provided in
accordance with this invention as best seen in FIG. 1. The pump 10
has a tubular body 12 and an attached coaxial housing portion 14
jointly defining a longitudinal extending chamber 16 wherein a
piston subassembly is received for reciprocating movement.
The piston subassembly includes a water piston 18 of V shaped half
section opening toward the housing portion 14 and a concentrate
piston 20 which is of reduced size and is reciprocable with a
cylindrical liner 22 preferably formed of stainless steel for
increased abrasion resistance while minimizing any resistance to
piston movement. The liner 22 projects beyond housing portion 14
and into concentrate chamber housing 24 suitably fixed to the
housing portion 14 by a nut 26.
Concentrate inlet and outlet fittings 30, 32 are provided in the
concentrate chamber housing 24, and the inlet fitting 30 is shown
having a check valve 34 exclusively providing one-way flow of
concentrate into the housing 24 through a supply line 35 connected
to an insulated concentrate tank 36 (FIGS. 1-3) that maintains the
concentrate in a refrigerated condition until discharged in a
drink. If desired, tank 36 could also be adapted to serve as a
source of concentrate to be dispensed at room temperature or even
at elevated temperatures depending on the uses to which the
dispenser is to be applied.
A throw adjustment screw 28 is threadly secured within an end of
the housing 24. The screw 38 may be set to project a preselected
distance beyond an inner end of the plug 24 and then locked in
position by a hex nut 42 to provide a left hand stop for the
concentrate piston 20 defining a discharged position for the piston
subassembly.
The piston 22 is secured to an axially extending connecting rod 46
integrally fixed to a circular end plate 48 of the water piston 18
that is reciprocable within chamber 16 to an extent limited by a
throw adjustment screw and a spacer plug (not shown) coaxially
mounted within the water piston 18 to provide a right hand stop
defining a loaded position for the piston subassembly.
To assist self-centering reciprocating movement of the pump 10, a
perforated guide tube 70 is coaxially received within the chamber
16 and has a flared end 71 abutting housing portion 14 for seating
one end of a return compression spring 72 coiled about the guide
tube 70 and the water piston 18. It is to be noted that the guide
tube 70 additionally serves to maintain the return spring 72 in
proper position.
The concentrate piston 20 and water piston 18 thus divide chamber
16 into separate concentrate and water measuring chamber portions
and a rear operating chamber portion 84, the pistons 18, 20 and
their respective chamber portions or compartments being of
predetermined sizes for precisely metering measured quantities of
concentrate and water in a fixed preselected ratio which may be
controlled in volume by setting the throw adjustment screw 38. The
forward concentrate compartment is provided with separate inlet and
outlet fittings 30 and 32 as described above, and the back water
compartment is also provided with separate inlet and outlet
fittings 86 and 88 secured to the body 12 and the housing portion
14 respectively.
While not described in detail, suitable fluid-tight seals and
packing rings are provided in the system where needed to ensure
against undesired fluid leakage between component body parts as
well as between the different compartments of the chamber 16 and
their respective fittings in accordance with well known
conventional techniques. Each of the seals is preferably formed of
a suitable, commercially available, dry bearing plastic material
exhibiting low abrasive characteristics and minimal deformation
under load while possessing high wear resistance and high
compression strength over a wide range of temperature to provide a
suitable low friction piston seal.
For illustrative purposes, the tank 90 is described as having a
suitable heated liquid therein, although it is to be understood
that the dispenser could be easily modified to permit tank 90 to
serve in a different capacity, e.g., wherein another cold liquid is
desired to be mixed with the refrigerated concentrate to provide a
blended, cold beverage.
To operate the pump 10 at high speed dispensing cycles with minimal
energy requirements, as well as to provide for minimum water
consumption, a common supply and tank return conduit 92 is
connected in permanently open communication with the operating
compartment 84 for supplying tap water under pressure to drive the
piston subassembly from its loaded position to its discharged
position. Thereafter, the spent tap water returns from the
operating compartment 84 via conduit 92 to the water tank 90 to be
heated such that it is conditioned to be dispensed in a subsequent
cycle. Moreover, the fluid circuit is particularly suited for
operation wherein ordinary city water is supplied at approximately
35 psi to 15 psi gage pressure.
More specifically, the supply and tank return conduit 92 is
connected to an open service port 94 in a solenoid operated main
flow control valve 96. The main control valve 96 has a normally
closed inlet port 98 communicating with an ordinarily water supply
line 101, and a normally open outlet port 104 of the main control
valve 96 is connected with the water tank 90. A branch inlet line
105 is provided for supplying water to the tank 90, excessive flow
being accomodated by an overflow line 103 connected to a suitable
drain, not shown. The inlet water is controlled by a float operated
valve 106 in the line 105 to assist in maintaining a substantially
constant volume within the tank 90.
The main control valve 96 is provided with suitable electrical
connections to be energized in response to a demand signal in a
well known manner. Upon energization of the main valve 96, the
pistons 18 and 20 are immediately thrust forward against the spring
force into discharge position to simultaneously dispense cold
concentrate and hot water from the pump 10 through their respective
outlets 32 and 88.
During this power stroke, the fluid circuit inlets to the
concentrate and water compartments of the pump 10 are closed. While
the check valve 34 effectively prevents reverse flow of concentrate
into tank 36, the inlet 86 to the water compartment is closed off
to the water tank by a valve member 108 of a solenoid operated
auxiliary control valve 110 seating against a normally open working
port 112 between a pump inlet line 114 and a hot water conduit 116
extending upwardly in the tank 90 for conducting hot water from the
top of the tank 90 into the water compartment of the pump 10.
Although the auxiliary control valve 110 is normally open, it is
energized in phase with the main control valve 96 to close off the
inlet 86 between the pump 10 and the tank 90 during the power
stroke of the pump.
The water supply line 101 and branch inlet line 105 are connected
to a fluid motor impeller 60 that is fed by a water supply 100. The
fluid motor impeller 60 provides an intermittent agitation of the
concentrate in the tank 36 immediately preceding withdrawal of the
concentrate through supply line 35. The agitator assembly 80 for
stirring the concentrate is driven through a magnetic drive
provided by the fluid motor impeller 60.
The agitator assembly designated generally 80 has a plurality of
vanes 81 which are equally spaced and which extend radially from
adjacent to the center of the impeller to the outer periphery
thereof. A stirrer rod 85 is suspended within the container 36 from
a removable lid portion 91. A pivot ball 89 is secured to the upper
end of the stirrer rod 85 and positioned within a cavity of the
removable lid 91 so as to rotate therein during the stirring of the
concentrate. A bar magnet 82 is completely embedded within a
plastic material 83 and attached to the lower end of the stirrer
rod 85 by the vane portions 81.
The impeller 60 has a magnetic core 61 which may be of any suitable
manufacture. In the present instance the core 61 is a bipolar
circular magnet which is suitable sealed or embedded in a plastic
ring portion 64 so as to prevent the contamination of the product
by the magnet or vice versa. This ring portion 64 is mounted for
free rotation on a stud 63 which is fixed centrally on the bottom
wall portion 62 of the impeller 60. A non-magnetic top plate 65 is
secured to the bottom portion 62 by bolts 93. The impeller 60 is
provided with an inlet 66 and outlet 67 (as shown in FIG. 3) for
passage of water therethrough.
It will be apparent that as water enters the inlet 66 of the
impeller 60 from water supply 100, the impeller will rotate and
when opposite poles of the magnets 61 and 83 come into registry
there will be a magnetic coupling between the two so that they will
revolve together as a unit causing the agitator to stir the
contents of the tank 36 to mix the contents of the concentrate and
prevent sediment from settling. It will also be apparent that as
the agitator rotates, liquid will flow through the grooves and the
impeller 60 and provide a lubricant between the ring portion 64 and
stud 63 so as to reduce wear of the parts of the impeller in
contact therewith. Additionally, because of the large ratio of
water to concentrate, it will be apparent that there is sufficient
volume of water available to drive the impeller and more compact
operation is present.
It should be manifest that while a preferred embodiment of the
present invention has been shown and described for illustrative
purposes, the present invention is nevertheless capable of wide
variation within the purview of the invention. For example, the
present invention could be incorporated in a conventional premix
carbonated beverage system. Such conventional pre-mix carbonated
beverage systems generally employ a tank for holding the premix
beverage, a carbon dioxide inlet connection for the tank, and a dip
tube suspended within the tank and connected to an outlet
connection on the top cover portion of tank. In normal operation,
carbon dioxide is supplied to the tank through the inlet connection
of the tank for driving the pre-mix beverage up the dip tube and
out of the tank. The pre-mix beverage is then supplied through a
serving nozzle to the consumer. The present invention can be
incorporated in such a system, as more aptly illustrated in FIGS. 4
and 5. In FIG. 4 it will be seen that the present invention can be
incorporated in such a system so that a stirring element 180
suspended by a stirrer rod 185 from a pivot ball 189 secured to the
upper end of the stirrer rod 185 and positioned within a cavity of
a removable lid 191 may be driven by a fluid motor impellor 160
which embodies the same construction as described above in relation
to FIG. 2. In such a system, the premixed beverage is withdrawn
through the dip tube 135 within the tank 136 and supplied as the
required drive for the fluid motor impellor 160. After passing
through the impellor 160, the premixed beverage is supplied from
outlet 167, see FIG. 5, to a serving nozzle (not shown) to the
consumer.
In view of the above-described embodiments it will be seen that a
dispenser with an agitator assembly in accordance with this
invention can be readily constructed for dispensing metered
quantities of a plurality of different fluids each of which can be
either hot or cold, depending on the requirements of the beverage
desired to be dispensed. As aforesaid, the term beverage is meant
to include a variety of consumable liquids such as coffee, soup,
beer, fruit juices, vegetable juices, milk, tea, pre-mix beverages,
carbonated beverages and similar liquid foods and drinks. The
agitator dispenser of this invention will be seen to be of rugged,
compact construction which is quick and easy to assemble in
addition to being capable of providing dependable operation over
extended periods of time with minimal maintenance and service
requirements.
It is believed that the present invention, its mode of
construction, assembly, and operation, and many of its advantages
attendant thereto should be readily understood from the foregoing
without further description, and it should also be manifest that
while a preferred embodiment of the invention has been shown and
described for illustrative purposes, the structural details are
nevertheless of wide variation within the purview of the invention
as defined in the appended claims.
* * * * *