U.S. patent number 3,874,007 [Application Number 05/276,285] was granted by the patent office on 1975-04-01 for liquid dispensing apparatus and method for toilet flush tank.
Invention is credited to John E. Dolan.
United States Patent |
3,874,007 |
Dolan |
April 1, 1975 |
Liquid dispensing apparatus and method for toilet flush tank
Abstract
A concentrated liquid supply vessel is inverted within a toilet
flush tank and suspendingly supports the closure cap which serves
as a dilution vessel. The concentrated liquid within the supply
vessel has a density greater than water and flows through the
supply vessel outlet opening into the dilution vessel during the
period when the flush tank water is lowered from its normal full
position to the elevation of the supply vessel outlet opening. This
concentrated liquid mixes with water retained within the dilution
vessel. Upon refilling of the flush tank, the diluted liquid in the
dilution vessel will migrate into the flush tank water.
Inventors: |
Dolan; John E. (Quarry Heights,
Harrison, NY) |
Family
ID: |
26811992 |
Appl.
No.: |
05/276,285 |
Filed: |
July 31, 1972 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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114265 |
Feb 10, 1971 |
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Current U.S.
Class: |
4/227.5; 4/DIG.9;
4/227.4; 248/311.3 |
Current CPC
Class: |
E03D
9/037 (20130101); E03D 9/038 (20130101); Y10S
4/09 (20130101); E03D 2009/028 (20130101) |
Current International
Class: |
E03D
9/02 (20060101); E03D 9/03 (20060101); E03d
009/02 () |
Field of
Search: |
;4/227,228 ;248/311 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Hornsby; Harvey C.
Attorney, Agent or Firm: Browne, Beveridge, DeGrandi &
Kline
Parent Case Text
This is a continuation-in-part of my earlier patent application
Ser. No. 114,265, filed Feb. 10, 1971 and abandoned and entitled
Liquid Dispensing Apparatus and Method for Toilet Flush Tank.
Claims
I claim:
1. Apparatus for dispensing liquid into a toilet flush tank which
is normally filled to a given water level, is discharged during a
flush to reduce the water level and then is refilled to the given
water level preparatory to the next flush, said apparatus
comprising the following:
a supply vessel for a concentrated liquid, said supply vessel
having an outlet opening,
means for supporting the apparatus in a flush tank at an
orientation where the supply vessel outlet opening lies below the
level of concentrated liquid therewithin, said supply vessel outlet
opening being in communication with the toilet flush tank at all
times regardless of the water level,
an upwardly open dilution vessel having an opening which is in free
substantially horizontal communication with water in the flush tank
to permit its filling by water in the flush tank,
means for supporting the dilution vessel at a position under the
supply vessel outlet opening, said dilution vessel being
constructed to remain spaced from said outlet opening regardless of
the water level in the toilet flush tank whereby lowering of the
water level in the flush tank below the dilution vessel opening
will result in a mixture in the dilution vessel of concentrated
liquid from the supply vessel and water retained by the dilution
vessel, thereby providing a dilute liquid which will be dispensed
into the flush tank water after it returns to the elevation of the
supply vessel outlet opening.
2. The apparatus of claim 1 having a concentrated liquid in the
supply vessel, said concentrated liquid having a density greater
than water whereby the concentrated liquid tends to flow downwardly
into the dilution vessel rather than migrate laterally into the
flush tank water during the initial portion of a flush before the
water level in the flush tank becomes lower than the dilution
vessel opening.
3. The apparatus of claim 1 wherein the means for supporting the
dilution vessel is a stem which is attached to the dilution vessel
and extends centrally through the supply vessel outlet opening to
suspend the dilution vessel from the supply vessel.
4. The apparatus of claim 1 wherein the supply vessel has a neck
portion leading to the supply vessel outlet opening, a plug within
the neck portion, said supply vessel outlet opening being located
in the plug.
5. The apparatus of claim 4 wherein the means for supporting the
dilution vessel is a stem which is attached to the dilution vessel
and extends through the supply vessel outlet opening, said stem
suspending the dilution vessel and having a transverse enlargement
larger than the supply vessel outlet opening to prevent removal of
the stem and the dilution vessel from the apparatus.
6. The apparatus of claim 5 wherein the plug is an inverted cup
having the supply vessel outlet opening located in its upper wall;
whereby air is entrapped within said inverted cup and forced into
the supply vessel as the flush tank water rises above the level of
the dilution vessel.
7. The apparatus of claim 1 wherein the size of the supply vessel
outlet opening is capable of discharging concentrated liquid when
the hydrostatic head at the supply vessel outlet opening is
decreasing.
8. The apparatus of claim 7 in combination with a concentrated
liquid in the supply vessel, said concentrated liquid having a
density greater than water whereby the concentrated liquid tends to
flow downwardly into the dilution vessel rather than migrate
laterally into the flush tank water during the initial portion of a
flush before the water level becomes lower than the dilution vessel
opening.
9. The apparatus of claim 1 having an inverted cup attached to the
supply vessel for concentrated liquid, said supply vessel outlet
opening being located in the upper wall of said inverted cup
whereby air is entrapped within said inverted cup and forced into
the supply vessel as the flush tank water rises above the level of
the dilution vessel.
10. A method of dispensing a concentrated liquid into a toilet
flush tank which contains a dilution vessel, said method comprising
the steps of
a. simultaneously lowering the water level in the flush tank and
feeding the concentrated liquid into the dilution vessel to permit
the concentrated liquid to mix with flush tank water retained by
the dilution vessel to form a dilute solution, and
b. raising the water level in the flush tank until it comes into
communication with the dilute solution in the dilution vessel so
that the dilute solution migrates into the flush tank contents.
11. The method of claim 10 wherein the step of feeding the
concentrated solution is performed while the dilution vessel is
immersed by water in the flush tank, said concentrated liquid being
released at a point above the dilution vessel and flowing
substantially vertically downwardly into the dilution vessel by
virtue of its having a density greater than water.
Description
This invention relates to a method and apparatus for dispensing a
concentrated liquid, typically a disinfectant or deodorant
solution, into the contents of a toilet flush tank. Apparatus of
this general type is well known and widely available; however, it
lacks the desirable operating characteristics and/or simple
structure disclosed in this specification.
Many types of prior flush tank dispensers typified by U.S. Pat.
Nos. 2,647,266 and 2,688,754 discharge the liquid into the flush
tank as the water level is lowered during the normal flush cycle.
With such an arrangement, there is no significant dispersion of the
solution in the flush tank when it is filled since dispensing
occurs principally during the discharge phase of the toilet flush
cycle. Another approach has been to provide a dilution vessel which
is filled during the refill phase of the flush cycle and then
discharged during the discharge phase of the flush cycle.
A somewhat complicated approach to dispensing concentrated
solutions into a flush tank during the refill phase of its
operation is represented by U.S. Pat. Nos. 2,913,734 and 2,967,310.
In these prior devices, a float operated pump-like device has a
chamber which is filled by the concentrated liquid in response to
the lowering of the flush tank water level and is discharged in
response to the rising of the flush tank water level. This prior
apparatus purposely prevents any preliminary dilution of the
concentrated liquid by providing an umbrella skirt which prevents
entry of the flush tank water into the dispensing chamber.
According to the present invention, a dilution vessel is located
beneath the outlet opening of the concentrated liquid supply
vessel. There is free horizontal communication between the dilution
vessel and the water in the flush tank. The dilution vessel retains
water from the flush tank throughout the entire flushing cycle and
it receives liquid from the supply vessel as the flush tank water
level is lowered, thereby resulting in a mixture in the dilution
vessel of the concentrated liquid and the retained flush tank
water. When the tank refills to the level of the dilution vessel
lip or other opening, the dilute solution then may migrate freely
into the remainder of the tank contents with the partial assistance
of the chemical solubility of the solution in water and the
turbulence which exists during the tank-refilling phase of the
flush cycle.
The objectives of the invention are to provide an uncomplicated yet
effective device which will discharge a concentrated solution into
the flush tank of a toilet during the refilling phase of the flush
cycle.
Reference is now made to the drawings wherein:
FIG. 1 is a perspective view of one form of the apparatus in its
suspended position within a toilet flush tank;
FIG. 2 is an exploded view of the apparatus of FIG. 1;
FIG. 3 is an end view of the stem used in the apparatus of FIG.
1;
FIG. 4 is a sectional view of the apparatus of FIG. 1 in operative
condition;
FIG. 5 is a sectional view of a second form of the apparatus;
FIG. 6 is a sectional view of a third form of the apparatus showing
the closure cap in its sealing position to permit transportation of
the device when not in use;
FIG. 7 is a view similar to FIG. 6, but showing the closure cap in
a position where it is suspended from the supply vessel to serve as
a dilution vessel;
FIG. 8 is a sectional view along the line 8--8 in FIG. 7;
FIG. 9 is an elevational view of a fourth form of the invention
located within the flush tank of a toilet;
FIG. 10 is a top plan view of the device of FIG. 9 as it appears
when installed within a toilet flush tank; and,
FIG. 11 is a sectional view seen along the line 11--11 in FIG.
10.
FIGS. 12 and 13 are, respectively, elevational and plan views of
the bottom of the container when the hanging clip is in its storage
position prior to installation of the device in a toilet flush
tank;
FIG. 14 is a sectional view through the dispensing elements of the
device shown in FIG. 9; and,
FIG. 15 is an exploded view of the dispensing elements.
This invention will now be described by reference to these drawings
which illustrate several preferred embodiments of the
invention.
FIG. 1 shows one embodiment of the apparatus of this invention in
its operative position where an inverted bottle 2 preferably formed
of a plastic such as polyethylene or the like, serves as a supply
vessel for the concentrated liquid. The bottle may be made by any
convenient technique such as blow molding etc. and is provided at
its bottom wall with a diametrically-extending recess having a
recessed wall portion 4 and an integrally molded, headed stud 6. A
suspension clip member 7 is laterally confined within the bottom
recess and is bifurcated to provide a slot which rides slidably on
the shank of the stud 6. The suspension clip 7 has a hooked end
portion 8 which is engageable with the upper edge of wall 10 of a
conventional toilet flush tank. The lid 12 of the flush tank
overlies the horizontal leg of the hooked end portion 8 so there is
preferably no exteriorly visible portion of the apparatus when
installed in a flush tank.
The flush tank and the mechanisms associated therewith are
conventional and well known to the average homeowner. A float valve
normally maintains the tank in a normal filled position which is
represented by the broken line 14 in FIG. 1. A flush cycle for this
type of apparatus involves a discharge phase and a refill phase,
with the discharge phase being initiated by the opening of a
discharge or flush valve at the lower portion of the flush tank.
This lowers the water level in the flush tank and releases the
flush tank water into the toilet bowl. The discharge valve then
closes and the apparatus undergoes a refill phase where fresh water
is added until the water level is restored to the normal level
14.
The significant portions of the invention reside in the liquid
discharging and diluting assembly which appears at the lower
portion of the apparatus in normal use. This includes the bottle
neck 16 which may have the usual exterior threads 18, a dilution
vessel 20 which has an open upper end which forms an opening in
free horizontal communication with water in the flush tank and a
stem 22 which, in this embodiment, is the means for supporting the
dilution vessel 20 from the supply vessel 2.
As shown in FIGS. 2-4, the dilution vessel 20 is a conventional
closure cap with interior threads 24 which cooperate in the usual
fashion with the threads 18 on the bottle neck 16.
Within the neck of the bottle, there is a plug member 26 which
overlies the lip of the bottle and has a generally cylindrical
skirt portion 28 which is frictionally retained by and sealingly
engages the interior wall of the bottle neck. The innermost portion
of the skirt 28 is slightly tapered in order to facilitate its
insertion into the bottle and to serve as a check valve seat in
some embodiments of the apparatus.
At the center of the plug 26, there is a boss 30 provided with a
central opening through which the stem member 22 projects. As
viewed in FIG. 4, the stem is held at its lower position due to the
presence of a transverse enlargement in the form of a retainer 32.
The retainer is press fit onto the upper end of the stem 22 and has
its lower surface constructed to contact the upper surface of the
boss 30 at spaced-apart portions, thereby leaving a passage for
fluid communication between the interior of the bottle 2 and the
outlet opening 34. The outlet opening 34 is annular, being defined
exteriorly by the hole in the center of the boss 30 and interiorly
by the stem 22. The difference between the diameters of the stem 22
and the hole in the plug 26 is about 0.009 inch. A convenient range
of spacing has been found to be about 0.005 to 0.050 inch. Such a
spacing insures flow of the disinfectant down the stem 22 without
any significant dispersion of the disinfectant into the flush
water.
The stem 22 has a circular flange 35 and a fluted and tapered
cylindrical head 36 which frictionally engages within a
corresponding recess in the cap or dilution vessel 20. The stem 22
and the plug 26 are made of polyethylene and therefore display
non-wetting characteristics which tends to prevent formation of a
film of liquid which would migrate through the outlet opening 34
and downwardly along the stem. A meniscus is formed between the
stem and the supply vessel outlet opening 34.
It will be evident that the apparatus will be merchandised in a
conventional upright position for a bottle, with the threads 24 on
the cap engaging the exterior threads 18 on the neck of the bottle.
In this position, the flange 34 will engage the boss 30 and
sealingly close the outlet opening 34 to prevent any inadvertent
loss of the liquid contents of the supply vessel 2. When the
consumer wishes to install the apparatus in the toilet flush tank,
the cap is loosened and the bottle is inverted so that the cap
falls until retainer 32 engages the plug 26, thereby enabling the
stem 22 to suspend the cap or dilution vessel 20 below the outlet
opening 34. The inverted bottle is then placed in the flush tank
and retained in position by the hooked end 8 of the clip member.
The normal operation of this apparatus involves a concentrated
liquid discharging phase which takes place during the flush cycle
substantially only during the lowering of the water level from the
level 14 until it arrives at the level 38 which is horizontally
aligned with the supply vessel outlet opening 34. During this
liquid discharging phase, the dilution vessel 20 is filled and is
in free horizontal communication with the tank contents. This would
appear to involve some risk that the concentrated liquid would
migrate into the flush tank water and be released during the flush
then in progress. This possibility is avoided as alluded to above
by adjusting the size of the outlet opening 34 and by using a
concentrated solution in the supply vessel 2 which has a specific
gravity greater than that of water so that when the solution is
discharged through the outlet opening 34, it will flow directly
downwardly in wisp or ribbon-like patterns into the dilution vessel
20. The loss of small amounts of the concentrated solution into the
flush tank contents at this point may further be inhibited by
shortening the stem 22. By using dimensions as above described for
the orifice 34 and conventional flush bowl concentrated
disinfectant or cleaner solution having specific gravities greater
than water, substantially no solution is dissipated into the
flushing water from stem 22 or opening 34 during the flush cycle.
Examples of some preferred concentrated solutions for use in this
invention include (by weight):
A
Two parts of sodium xylene sulfonate liquid (40% active), two parts
of sodium lauryl sulfate (30% active), 0.1 parts of blue dye, 0.5
parts of perfume oil and 95.4 parts of water. Specific gravity is
about 8.6 lbs/gal. (water being 8.3 lbs/gal.)
B
Five parts of isooctyl phenyl polyethoxy ethanol (100% active non
ionic detergent), 0.1 parts of blue dye, 0.5 parts of perfume oil
and 94.4 parts of water. Specific gravity is about 8.6 lbs/gal.
Inert fillers may be added to the solution to increase the specific
gravity if desired. The solutions were noted to form beads on a
polyethylene surface which were thinner than adjacent water beads
of the same diameter. Both solutions are partially soluble in water
to the extent that substantially no dispersion takes place during
dispensing down the stem, but excellent dispersion, with
turbulence, takes place from the dilution vessel.
As the discharge phase of the flush cycle continues, the
concentrated liquid will mix with the flush tank water retained in
the dilution vessel 20. Then, after the flush tank discharge valve
closes and the refill phase of the flush cycle continues to the
point that the flush tank water level reaches the elevation 40 of
the lip or other discharge opening in the dilution vessel 20, the
then-dilute solution is free to migrate into the tank contents with
the assistance of the currents created in the tank during the
refill phase of the flush cycle.
FIG. 5 illustrates another embodiment of this invention which is
similar in principle to the embodiment shown in FIGS. 1-4. The
differences reside in the relative elevations of the supply vessel
2a and the dilution vessel 20a, the nature of the enlargement at
the upper end of the stem 22a and the presence of a check valve
means in the flow path between the interior of the vessel and the
outlet opening 34a.
As seen in FIG. 5, the opening formed by the uppermost edge 42 of
the dilution vessel is relatively close to the peripheral edge of
the plug member 26a. In fact, these bodies are close enough that a
meniscus extends between them so that water fills the space below
the plug 26a even after the flush tank water level has receded
below the dilution vessel 20a.
The upper end of the stem 22a has a generally spherical enlargement
44 which is formed by exposing it to flame. This enlargement is not
a true sphere and the area thereof which rests on the boss 30a is
not truly circular so there is always an opening leading to the
supply vessel outlet opening 34a. As in the embodiment of FIGS.
1-4, the size of the fluid passage provided by this arrangement is
such that the concentrated liquid in the supply vessel 2a will not
normally be discharged when the exterior pressure at the supply
vessel outlet opening 34a is equal to or greater than atmospheric
pressure. However, it has been discovered unexpectedly that the
concentrated liquid is discharged by the supply vessel outlet
opening 34a in thin ribbons or wisps upon reduction of the external
hydrostatic head at the outlet side of the opening 34a.
The embodiment of FIG. 5 may utilize a check valve which comprises
a spherical body 46 which has a greater density than the
concentrated liquid and rests on a seat defined by the annular
upper edge of the skirt portion 28a of the plug member 26a. The
check valve provides a constricted flow passage which prevents
excessive discharge of the concentrated liquid particularly when
the supply vessel 2a is filled so that its contents exert a high
hydrostatic head at the outlet opening.
The reason why the concentrated liquid is able to pass around the
check valve is not completely understood, but it may result from
slight irregularities in the spherical body 46 or in the annular
seat formed by the skirt 28a. Whatever the explanation, it has been
proven that the concentrated liquid does arrive at the outlet
opening 34a, apparently without filling the intervening space
between the check valve and the supply vessel outlet opening 34a.
As in the preceding embodiment, the only significant discharge of
the concentrated solution through the discharge outlet 34a occurs
when there is a reduction of the hydrostatic head produced at the
outlet opening 34a by the flush tank water. Some concentrated
liquid may be released after the supply vessel outlet opening is
exposed to the atmosphere, but this is in relatively insignificant
quantities in relation to the amount released when the hydrostatic
head at the supply vessel outlet opening is decreasing. Again, and
because of the adjustment of specific gravity, non-wetting
characteristics and size of orifice opening 34a, substantially no
solution dissipates into the flush water during flush. Typical
dimensions found particularly suitable for carrying out the
objectives of this invention by this embodiment are as follows:
1. a blow molded polyethylene bottle having a height of about 7
inches, a base of about 3 1/2 by 1 1/2 inches, a tapered end
portion of about 5/8 inches in height and a cylindrical neck
portion 16 of about 7/8 inches in height,
2. the cylindrical neck portion 16 has an outer diameter of about
0.7 inches and an inner diameter of about 0.6 inches,
3. skirt 28a and boss 30a have a total height of about 1/2 inch
with boss 30 having a thickness of about 0.08 inches, orifice 34a
having a diameter of about 0.225 inches, and upper tapered portion
which retains marble 46 having an inner diameter of about 0.47
inches and an outer diameter of about 0.55 inches. The outer
diameter of the nontapered portion is about 0.61 inches,
4. marble 44 of ordinary glass having a diameter of about 17/32
inches,
5. stem 22a has a diameter of about 0.216 inches a total height
including head 36 of about 2 inches, the height of head 36 being
about 0.27 inches. A stem 22a of about 0.125 inches in diameter is
found too small such that immediate dissipation into the flush
water occurs. The flame retaining bubble 44 is about 0.25 inches in
diameter.
6. Cap 20a is tapered, has a height of about 1.25 inches and a
cylindrical fluid retaining section with a head 36 inserted therein
of a diameter of about 15/16 inches and a height of about 11/16
inches.
The apparatus of FIG. 5, either with or without the marble 46,
discharges the concentrated solution from the vessel 2a whenever
there is a reduction in the hydrostatic head at the supply vessel
outlet opening 34a, even when there is no opportunity for air to
enter the vessel 2a. For example, when the water level is
repeatedly raised and lowered between level 14 and an intermediate
level above the opening 34a, it has been found that the
concentrated liquid is always released under conditions of
diminishing hydrostatic pressure.
The embodiment shown in FIGS. 6-8 differs from those discussed
above by virtue of the manner in which the dilution vessel closure
is suspended by the supply vessel.
The cap 51 which serves as the dilution vessel in this third
embodiment is of generally closed-ended cylindrical construction
with the closed lower end 48 having a boss 50 contacting a plug 52
which lies within the neck of the bottle 49. The boss 50 obstructs
and seals the supply vessel outlet opening 54 so the device may be
transported safely when not in use.
The closure cap 51 is provided with interior threads 56 which
engage threads 58 on the bottle neck. Further down the bottle neck,
there are four externally radiating projections 60 which are best
shown in FIG. 8. These projections lie in the path of the internal
threads 56 or a specifically provided annular interior ridge. As
shown in FIG. 7, the projections engage the threads or interior
ridge to retain the dilution vessel and suspend it from the supply
vessel 49.
As in the preceding embodiment, there is a marble 62 which seats on
the annular upper edge of the plug member 52, thereby preventing
excessive discharge of the concentrated liquid in the supply vessel
49 into the dilution vessel 51. Since the principles of operation
of this apparatus are similar to that described above, it will not
be discussed in detail. The appropriate operation may require some
routine experimentation with the size of the supply vessel outlet
opening 54 in order to achieve optimum results.
In the embodiments discussed above, it has been found that water
enters the bottle when the hydrostatic head at the bottle outlet is
increasing. After extended usage, the bottle contents become dilute
so the device will appear to function improperly.
A fourth and presently preferred embodiment of the invention is
illlustrated in FIGS. 9-15 which is constructed to prevent dilution
of the bottle contents. As in the previously-discussed embodiments,
a dilution vessel receives the concentrated liquid from the
container.
The container-supporting means in the embodiment of FIG. 9 is
somewhat different than previously discussed. A retaining clip 70
is pivotally mounted on a button 72 which is molded integrally with
the container 74. The button is located within an indentation in
the bottom wall of the container and, as best seen in FIG. 11, the
button 72 has a reduced diameter stem and an enlarged head which
serves to retain the clip 70 on the container.
Referring to FIGS. 11 and 12, it will be seen that the clip 70 has
a base portion 80, an arcuate upstanding flange 82, a horizontal
extension 84 and a vertical leg 86. The base portion 80 lies in
contact with the horizontal wall of the indentation 76 and it has a
keyhole slot 78 which engages the button 72 for pivotal movement.
Inadvertent sliding movement of the clip is prevented by the small
bumps 79 in the base 80 which retain the stem of button 72 in the
narrow portion of the keyhole slot 78.
When the clip 70 is in its storage position shown in FIG. 13, the
horizontal portion 84 is located between the two feet 85 which
prevent the clip from inadvertently being deflected. The clip is
also retained in its storage position by the bumps 87 on the
container which lie on opposite sides of the vertical leg 86 of the
clip 70. In this condition, the container may be placed upright on
a shelf prior to installation in a toilet tank. The container will
rest on the feet and on the horizontal leg 84 of the clip 70.
The arcuate flange 82 provides the necessary offset for the
horizontal portion 84, and its arcuate shape facilitates the
pivotal movement of the clip 70 on the button 72. As will be seen
in FIGS. 9 and 11, when the device is supported in a tank of a
toilet, the horizontal extension 84 of the clip 70 lies on the
upper edge of the tank wall, while the vertical leg 86 is in
contact with the outer wall of the toilet tank. In order to prevent
the container from rocking on the toilet tank, the faces of the
container have projections 88 which afford a flat surfaces 90
aligned with the clip when in its position of use as shown in FIG.
10. The clip 70 may be swung in either direction to permit
placement of the container at a location where it will not contact
any moving parts of the toilet mechanism.
The dispensing of the concentrated fluid takes place within the
elements shown in FIGS. 14 and 15 where it will be seen that the
neck 92 of the bottle receives an inverted cup 94 which has an
opening 96 in its upper end for passage of the concentrated liquid.
A stem 98 extends through the opening 96 and has an enlarged upper
end 100 which limits the downward movement of the stem 98 with
respect to the inverted cup 94.
The dilution vessel 104 is supported at the lower end of the stem
98. The stem 98 extends through a central aperture 106 in the
dilution vessel 104, and the lower end of the stem has an enlarged
head 102 which has an upper conical surface 108 conforming to a
conical lower portion of the opening 106. Of course, the stem 98
may be made integrally with the dilution vessel 104, but the
illustrated structure is the most economical to manufacture.
The upper lip of the dilution vessel 104 lies about 0.280 inch
below the inverted cup 94, so that no meniscus will form between
these elements. If such a meniscus were permitted to form, the
desired amount of air would not be introduced into the container
when the water rises, and the dispensing elements of this
embodiment would not function properly.
The elements shown in FIG. 15 are assembled by passing the upper
head 100 of the stem 98 through the aperture 106 in the dilution
vessel, and then forcing the head 100 through the aperture 96 in
the inverted cup 94. A small notch 110 in the dilution vessel
facilitates this latter step and provides a small opening for the
passage of the liquid when the device is in use.
The inverted cup 94 serves to prevent water in the toilet tank from
entering the bottle, thereby avoiding any unwanted dilution of the
concentrated bottle contents. As the water in the toilet tank rises
in preparation for the next flush, air is trapped within the
inverted cup 94 and some air is forced through the opening 96 into
the bottle. When the toilet is flushed and the water level in the
tank recedes, the reduction of pressure within the inverted cup 94
will cause some of the concentrated liquid to pass through the
opening 96 and into the dilution vessel 104 where it becomes mixed
with the toilet tank water left in the dilution vessel. A partial
vacuum remaining within the container will prevent excessive
dispensing of the concentrate through the small outlet opening. In
this manner, the liquid concentrate is not dropped immediately into
the receding water but is instead retained in the dilution vessel
104 where it becomes premixed with the retained water. Then, as the
water level rises, the premixed solution in the dilution vessel 104
becomes mixed with the liquid in the toilet tank. Continued rising
of the water forces more air into the container so that more liquid
will be released from the container when the water again
recedes.
Those studying the disclosure will realize that there are further
variations of the invention which will utilize the novel principles
discussed in this specification. The following claims are therefore
intended to cover all forms of apparatus which utilize the spirit
of the invention as defined by the claims. As a matter of
convenience in terminology, the apparatus is described in terms of
the relationship of its elements when located within a toilet flush
tank, but it is to be understood that the claims are intended to
cover all apparatus constructed and designed to assume the claimed
relationship, even when in an upright position prior to its
installation in a flush tank.
* * * * *