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Патент USA US3094716

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June 25, 1963
P. E. PlHl. ETAL
Filed Feb. 17. 1960
2 Sheets-Sheet 1
June 25, 1963
Filecrl- Feb. 1'7. 1960
2 Sheets-Sheet 2
Unire States arent
Patented June 25, 1963
These and other objects are realized in the preferred
embodiment of this invention by utilizing a siphon device
featuring a vertically extensible Siphon tube, a float co
Paul E. Pihl, Bluemont, Va., and Preston M. Hall,
operating with said siphon tube, and a flow restriction
9612 Merwood Lane, Silver Spring, Md.
Filed Feb. 17, 1960, Ser. No. 9,218
means located in the ñush tank discharge tube.
10 Claims. (Cl. 4-48)
In the drawings:
FIGURE 1 is 4a front view partially in section of the
This invention relates generally to liquid receptacle con
first embodiment of our invention;
trol means and more particularly to the flushing apparatus
FIGURE lA shows the relative positions of the dis
for tiush tanks.
10 charge pipe, flexible sleeve, and tiow restriction means as
The primary object of this invention is to provide a
and immediately after the liquid has been iiushed from
simple inexpensive apparatus for a flush tank which
the tank;
eliminates the need for a gravity operated stop flow outlet
FIGURE 2 is a sectional plan view taken along line
valve, said valve being the cause of a large percentage of
2-2 of FIGURE 1;
the leaky ñush tanks. While a leaky flush tank connected
FIGURE 3 is a fragmentary vertical sectional view of
to a municipal Water distribution system is an expensive
the ñow restriction means of the FIGURE 1 embodiment;
annoyance, a leaky iiush tank connected to an independent
FIGURE 4 is a View of the lower end of the ñush tank
supply such as a well or tank on a farm is intolerable as
discharge tube showing a modified form of the flow re
it will soon exhause the water supply. In prior efforts to
striction means;
eliminate leaky ñush tanks, various Siphon tube arrange
FIGURE 5 is a sectional elevation View of another
ments have been proposed but none have been acceptable
embodiment of the present invention;
practically or commercially.
FIGURE 5A is a fragmentary section along the line
Siphon tubes used prior to this invention have several
disadvantages, one being that they are usually of a fixed
FIGURE 6 is a sectional elevation view of another
length and therefore are effective only for a certain given 25 embodiment of the present invention;
static water level, which in turn depends on `a given
FIGURE 6A is .a fragmentary section along the line
constant water pressure. The device of the present inven
(SA-6A of FIGURE 6;
tion, however, is adapted by a novel float means to func
FIGURE 7 is a view partly in sectional elevation of
tion effectively at various Water levels since the effective
another embodiment of the present invention;
siphon tube is vertically extensible and the top of the tube 30
FIGURE 8 is a sectional elevation of the siphon pump
is held at a fixed distance relative to the Water level.
Another disadvantage of Siphon tubes, particularly ex
tensible tubes found in the prior art, is that they are too
complex and therefore, ineiiicient, costly, and require
special tank fittings. Moreover, they may require jetting
to initiate the siphon action and to expel the contents of
shown in FIGURE 7;
FIGURE 9 is a horizontal sectional view taken along
line 9_9 of FIGURE 8;
FIGURE l0 is a sectional view of still another em
bodiment of the present invention; and
FIGURE l1 is an enlarged view of .a portion of FIG
the tank through the discharge pipe, in some instances,
URE 10.
requiring that the operator hold the handle during part
While the invention broadly may be used for dispensing
or all of the flushing operation.
any type of liquid in regulated amounts, the description
The relatively simple device of the preferred embodi 40 will be restricted to its use in a flush tank for the purpose
ment of this invention merely employs a float, discharge
of illustrating this invention. FIGURE l shows a con
tube, and a flexible connection therebetween, and it is
only necessary to depress the operating handle momen
tarily so as to initiate a Siphon action. Moreover, the
device may be easily installed by .a “do it yourself” horne 45
owner in any flush tank by a simple connection requiring »
no special skill or tools.
Accordingly, a further important object of this inven
tion is to provide a Siphon apparatus for a flush tank
ventional ceramic ñush tank 2 having a cover 4, and a
Water inlet fitting `6 which extends through the bottom
of tank 2 which is water sealed thereto at 7 and which is
connected to an inlet control valve 10 through pipe 8.
Valve 10 is operated by a conventional ñoat 12 on rod
14 and admits Water to the bottom of the tank through a
refill tube 16.
The Siphon device of the present invention Ifor discharg
that may be quickly and easily installed in a conventional 50 ing water from the tank comprises =a substantially vertical,
ñush bulb operated flush tank to replace the latter means.
single column discharge pipe 17 extending vertically
Another object of this invention is to provide an inex
through a conventional tubular bulb valve seat element
pensive apparatus Which will efficiently empty a flush tank
18 in tank outlet opening 2’ «and fixed thereto by [a Water
by a siphon means having controlled iiow and relatively
tight securing means 19, which is preferably a water
strong siphoning power.
55 resistant cement, la tightly fitting «rubber ring, or other
Another object is to provide a flushing apparatus that
may operate at varied water levels with the same high
suitable water resistant material capable of securing pipe
17 in element 18 against relative movement. Valve seat
quality performance at each level.
element 18, which is exteriorly threaded is mounted in
Another object of the invention is to minimize the noise
water tight relation through opening 2’ by means of nut 20
usually attending the operation of conventional flush tanks 60 and gaskets 20’and the lower end of valve `seat element 18
by instituting a quietly operating Siphon action to effect
extends through the opening 21’ in the upper portion of
discharge from a tank.
-a ñush bowl 21 -and is extensively sealed thereto in the
More specifically it is an object of this invention to
conventional manner. With the exception of pipe 17 Eand
provide a flush tank Siphon apparatus embodying an up
securing means 19, the structure thus far described is
right open ended tube having an annular weir of uniform 65 conventional :and further details will therefore not be set
out. The discharge pipe 17 extends substantially v'concen
height over which water is carried to overiiow to initiate
siphoning action.
trically through ñush valve seat element 18 Iand is sub'
stanti-ally longer than `said valve seat element 1.8 ‘for a
Further objects Will be apparent to those skilled in the
purpose to be described hereinafter. Surrounding the
art from the following description of the apparatus and
portion of pipe 17 in the tank 2 is :a ilexi‘ble sleeve
exempliíications thereof, and from the scope of the
24 which is made of latex, neoprene, nylon or other suit
appended claims.
able wate-r »resistant highly flexible material and `at its
lower end is sealingly clamped to pipe 17 `by a friction
clamp ring 25.
An inverted cup-shaped siphon bell 30, which may be
of either light metal or plastic, has in this embodiment
four substantially concentric tubular members depending
:from the top Wall 39 thereof. Skirts 35 and 33, the outer
and next inner members respectively, Vare sealingly secured
to or integral with the under surface of top wall 39 of
the lioat, skirt 36 being substantially longer than 3S.
When the water surface seals the 4annular bottom opening
of the -annular space 37 between skirts 36 Aand 38 las shown
at 37’ in FIGURE 1, the annul-ar space 37 with `air en
vtrapped therein forms an Áannular float chamber in bell 30.
Flotation maybe eifected by means of sealed -air pockets,
plastic foam, rubber foam or any other similar means
providing suiiicient bouy-ancy to place the top edge 44 of
a tubular member 4t) (about to be described) above water
level 39’ of the water between skirt 35 and tubular «mem
ber 40 which is the same level yas the level of the water
in prior siphoning devices used for this purpose. Not
only does the extra length of this pipe produce a stronger
Siphon, it also enables the Siphon action to be initiated
instantly by a depression of the handle since this lower
portion of the tube -acts in cooperation with flow restric
tion means 52 fas shown in FIGURE 1, or in the alterna
tive, ñow restriction means 64 shown in FIGURE 4
(both of which are hereinafter described) to build up
the head rapidly. This rapid build-up insures that the
siphon will not -be broken by olîsetting any sudden
bouyancy effect which might result when the operating
handle 58 is suddenly released. When siphoning action
is established, the pressure within skirt 38 above the top
of tube 40 drops below atmospheric pressure sufficiently
so that the Siphon float 36 and hence tubular member 40
will also be lowered around pipe 17 to the bottom of the
tank 2 and will remain there until after the tank is sub
stantially emptied and the Siphon is broken by yair flowing
in below the bottom of skirt 36 at which time Water inlet
in the tank 2 outside skirt 36.
20 valve 10 controlled by ñoat 12 begins to reñll the tank
in a well-known manner. The bell 30 will remain on the
Also suspended from the top wall 39 of the bell 30 is
bottom until flotation is established at which time the bell
the tubular member 40 having its upper edge 44 spaced
30 will float and support the lip 44 above the level of
from said top 39 Áand a lower portion closely surrounding
the water as the tank is filled. For example, the -bouyancy
'the outwardly flared upper lip 17' of discharge pipe 17
to cooperate therewith to guide the vertical movement of 25 should be such that lip 44 is supported »approximately %"
`above the water level. This assures prevention of leakage
bell 30 within tank 2 and receiving the upper end of sleeve
but permits overflow over lip 44 if the shut-off valve
24 at 23 as shown. In its unstretched condition, the inter
should not function after sleeve 24 'has reached its «fully
-nal diameter of lsleeve 24 is less than the external diam
eter of tubular member 40 so that when it is stretched over
extended position. This overflow action takes place with
the lower end of tubul-ar member 4h, it forms a fluid tight 30 out initiating siphoning action as the overflow rate is very
seal therewith. The yinternal diameter of sleeve 24 is,
0f particular importance in the operation is the char
however, greater than the external diameter of tube 17
acter of sleeve 24 which must offer very little upward
within tank 2 being normally held against the exterior of
force after being depressed. Otherwise, the -bell 30
pipe 17 by exteriorally applied hydrostatic pressure of the
would be prematurely raised to the top position and stop
water within tank 2.
the siphoning action. Therefore the sleeve 24, in addi
Innermost depending member 46 which constitutes a
tion to being made of light flexible rubber which is pref
combined flow restriction means land secondary water
erably no heavier than that used in surgical gloves, for
:inlet also depends from the top wall 39 and surrounds an
example, is also arranged to fold, slip down, or roll
opening 47 in the top wall 39 of the bell 30. The portion
4S of wall 39 defining opening 47 is funnel shaped while 40 back over on itself as tubular member 40 is lowered.
This “roll bac ” characteristic, illustrated in FIGURE
the lower portion of tube 46 has ‘a radially outwardly ex
1A, results in practically no resistance due to folding or
tending annular ñange 52 the periphery of which is sub
kinking. There -is substantially no appreciable friction
stantially uniformly spaced from the interior of tube 17
between tubular member 40 and the rubber sleeve 24 or
when the lapparatus is in the position shown in FIG
between different portions of the rubber sleeve 24 itself
URE »1.
Disposed ‘above the funnel portion 48 of wall 39 is 45 inasmuch as water is an excellent lubricant for rubber.
While, to insure that the sleeve 24 rolls back on itself,
another water inlet pipe 56 which is also connected to
au inverted truste-conical shape sleeve element may be
inlet v-alve 10 and controlled by float 12.
used, the sleeve 24 shown -in llëlGURE 1 has been found
The overall horizontal cross-sectional shape of the bell
to be inexpensive and very eñicient.
may be cylindrical, rectangular, elliptical or irregular so
As long as valve 10 is open, tube 56 directs a small
long as the minimum cross-sectional area of the upward 50
stream of water through funnel portion 4S and tube
flow passage within the Siphon »bell 30 laround tube 4t) is
46 and thence into a closet bowl so as to provide the
equal to or greater than the minimum cross-sectional area
required water seal. This Water inlet arrangement of
of the outward flow passage through the discharge tubes
my invention is eiiicient and economical inasmuch as it
40 and 17. In other words, ‘as will be seen from the
FIGURES 5 and 6 embodiments, the bell may be ellipti 55 is not necessary to provide a special inlet tube into pipe
17 as is commonly done.
cal or rectangular rather than cylindrical as shown in
When water is flushed from a tank through a discharge
FIGURES 1 and 2. The optimum contiguration of bell
pipe there will be a ñow pattern established in the tube.
30 is dictated by the tank design. The primary con
This invention utilizes a radially outwardly extending
sideration is to provide enough yarea around tube 40 for
water flow up to the top edge 44 of the tube 40 and down 60 annular flange 52, which constitutes the ilow restriction
means of this invention, on the water inlet tube 46
¿into the tube 40 so that there will lbe no restriction in
which effectively blocks passage of air through the cen
ter of the tube 17 while it permits the flow of liquid
In operation of the device, handle 58 is actuated and
causes an actuator bar 60 to depress siphon bell 30 a dis 65 between it and the pipe 17. The purpose of the ñow
restriction means is to reduce the cross-sectional area of
tance vertically downward at least suñicient to lower the
the tube 17 at least when operation is initiated sufficiently
upper edge 44 of tube 40 below the water level 39' to
so that a minimum amount of water overflowing the top
thereby initiate a Siphon action. The depression of the
edge 44 of tube 4€) will form a slug of water providing
bell 30 causes water to flow over edge 44 carrying with
it the small `amount of `ai-r trapped inside member 38 above 70 a seal transversely of the tube 17 and thereby prevent
air how through the tube 17, which in turn would
the Water level 39’ `and quickly filling 17 .
prevent initiation of the siphoning action. Thus the iiow
Because the discharge pipe 17 has a long lower portion
restriction means performs a dual function since it also
which extends through valve seat element 18, »a large water
allows the siphon to be initiated with only a momentary
head is built up therein when the bell 36 is depressed
thereby producing a Istronger `Siphon action than iS found 75 depression of the float, as brought out above, by restrict
ing the iiow area in the discharge pipe 1’7 to cause a
quick build-up of water therein and thereby prevent the
slight rebounding, due to buoyancy, of the iloat 3i) from
llow of liquid from the tank through the recess 1118 and
upwardly through the interior of the cup-shaped element
90 to overllow the top edge .108 of the tube 74. Flow
will continue until the level in the tank reaches the level
The flow restriction means is shown in the preferred
of the top edge of recess 118 when the cup-shaped ele
form on tube 46 in FIGURES l and 1A, since this form
ment 91? is in its lower position with its bottom edge 116
cause a iiow restriction while the lioat is being lowered
resting on the bottom of the tank 84. When the water
but it also provides unrestricted flow after the element
reaches that level, air will be drawn in through the recess
52 passes the lower extremity of pipe 17 as soon as the
11S and Siphon action broken. Refilling of the tank with
Siphon has been initiated. ‘lt is within the scope of this 10 this embodiment is in all material respects the same as
invention to suspend a disk-like me-mber similar to ele
in the previous embodiment.
ment 52 by means of a spider or other support in the
The embodiment of FIGURES 6 and 6A is similar
breaking the Siphon prematurely.
pipe 17.
to the embodiment of FIGURES 5 and 5A with the ex
FIGURE 4 shows another ilow restriction means 64
ceptions that a bell 130 of rectangular cross-section is
which is a radially inwardly extending annular flange 64 in 15 provided as is shown in FIGURE 6A and a substantially
pipe 17, that may be substituted for element 52. Flange
frictionless water tight joint 132 is provided between
64 restricts the ilow at the bottom of the pipe to a
the inner tubular member 134 and the outer tubular
narrow vortex so as to eleminate the possibility of an
member 136 of the axially extensible `Siphon tube as
air pass in the center thereof and also provides for a
sembly 138 in lieu ot the bellows 76 of the FIGURES
water build-up in the discharge pipe as does element 52 20 5 and 5A embodiment. The bell 131i is formed by an
but, being ñxed in tube 1S, results in a slower rate of
inverted cup-shaped element y141i of rectangular horizon
total evacuation of tank 2.
tal cross-section and is provided with transverse parti
The embodiment of FIGURES 5 and 5A comprises a
tions 142 and 144 delining with the cup-shaped element
vertically extensible tube assembly 76 formed by `an
1449 air pockets 146 and 148 which are open at their
inner rigid tube 72, an outer rigid tube 74 slideablyinter 25 lower end and which form float chambers. The bell
litting with the tube 72, and a sleeve-type flexible bellows
136 is fixed to the top of the tube 136 with its top wall
76 iixed in liuid tight relation to the lower end of tube
150 in vertically spaced relation to the top edge 152 of
'72 by a collar 78 and iixed in iiuid tight relation at its
the tube 136 by equally angularly spaced struts 154 which
upper end to the exterior of tube 7-4 substantially mid
permit free circumferentially uniform tlow of water over
way of its length. The lower end of tube 72 is lixed in 30 the annular Weir deñning top edge 152 when the bell 13€)
iiuid tight relation to the outlet fitting 30, of conventional
is depressed suiiiciently to lower the top edge 152 below
form extending through the discharge opening 32 of the
the normal level '156 of the water within the cup-shaped
bottom wall of the tank
A guide collar 86 is pro
element 141i between the partitions 142 and 144. The
vided on the exterior of the lower end of tube 74 to
normal level of the water within the tank around the bell
prevent the thin wall rubber bellows 76 from wedging
136 is indicated `at 158 and the normal level of the water
between the tube 74 and 72 under the -inlluence of the
within the compartments 146 and 148 is indicated at 161)
externally applied hydrostatic pressure as the tube 74 is
and 162. The water tight frictionless joint 132 between
lowered relative to the tube 72. The bell 83 comprises
the tubular members 134 and 136 is provided by a body
an inverted cup-shape element 9i) of elliptical crossesection
of liquid 164 retained in the open top sealed bottom
horizontally, as is best shown in FIGURE 5A, having 40 annular space between the tube 134 and a further tube
transverse partitions 92 and 94 defining with the oppo
166 which is in radially spaced surrounding relation to
site ends of element 9G open bottom air pockets 96 and
the tube 134 and between which the tube 136 is free t0
9S. The bell 88 is mounted upon the upper end of the
move vertically. The body of liquid 164 is preferably
tube 74 by joining the external surface of tube 74 to the
of mercury but may be of any other iiuid which is heavier
opposed surfaces of the partitions 921 and §4- in substan 45 than the liquid contained within the tank, which will not
tially line contact as by cementing along the lines 111i)
wet or adhere to the tube 136, which is non-corrosive,
and 162. By this construction, the air trapped within
which is immiscible with and insoluble in the liquid with
the compartments 96 and `98 above the level of the water
in the tank. Since mercury meets all of these conditions,
at the bottom thereof indicated at 1114 and 11196 buoyantly
it is ideally suitable for use in a flush tank; 4the sole dis
supports the bell 8S and the tube '74 so that the overllow 50 advantage being the expense on the present day market
Weir defining top edge 163 of the tube 74 is normally
of mercury in sufficient quantities. The proportions of
supported slightly above the level 110 of the water with
the annular space between the tubes `134 and 136 and
in the cup-shaped element §11 between partitions 92 and
the lengths of the tubes 134, 136 and 166 are such that
94 which level is the same as the level 112 of the water
the lower end of the tube 136 is immersed within the
outside the bell 88. When the bell SS is depressed by 55 body of liquid 164 when the bell 130 is in its upper posi
a suitable mechanism similar to that illustrated in FIG
tion as shown in FIGURE 6 and the tube 136 may be
URE l so that the edge y1133 is below the level 110, water
lowered fully into the body of liquid 164 without causing
is free to ñow upwardly around the tube 74 between the
that liquid to overñow the tops of the tubes 134 or 166.
partitions 92 and 94, over the top edge 11th and down
By this construction, the tubes 134, 136 and 166 provide
through the tube 74 and the tube 72 to the discharge. 60 a vertically extensible Siphon tube offering substantially
The overiiow of edge 1118 is preferably uniformly dis
tributed circumferentially around edge 193. As in the
previous embodiment, a suitable tiow restriction means
no resistance to the descent of the bell 131i and no up
ward force upon the tube 135 tending to force it upward
ly and prematurely break the siphoning action. With
is preferably Íixed to the lower end of the secondary
these exceptions, the operation of this embodiment is
water inlet conduit 114 suspended from the top wall of 65 substantially identical with that of the preceding embodi
the cup-shaped element 90. As soon as Siphon action
ments described above in detail.
is initiated, the air trapped between partitions 92 and 94
FIGURES 7-9 show still another modification of the
above the level 110 ofthe water will be evacuated through
present invention. Discharge pipe 183 has secured at
the tubes 72 and 74 and the bell, due to the diiierence
the upper end thereof a support bracket 184 which rota
in pressure exerted on the exterior of its top surface and
tably supports an open end cylindrical pump element
the interior of its top surface between partitions 92 and
136 by means of a pivot pin 18S secured to said bracket.
94, will rapidly drop its lower position in which its lower
The pump is spaced evenly from pipe 183 by means of
edge 116 rests on the bottom of the tank `84. A recess
spacers 191 which are secured to said pipe and have a
or opening 118 is formed through the side wall of the
ball-shaped end to reduce friction.
cup-shaped element 9b at each side to permit continued 75
On the inner wall of the pump is mounted a plurality
of spiral-shaped vanes 190.
Gn the outer wall is a con
tinuous spiral groove 192 adapted to receive follower
element 194 mounted on actuator rod 196.
In operation the actuator rod is depressed causing the
pump to rotate by moving the follower 194 through slot
the top end wall of said element, said element having a
depending continuous side wall extending from said ele
ment end wall downwardly in spaced surrounding rela
tion to the upper end portion of said >conduit to deñne a
iiow passage with the `exterior of said conduit, manually
192 to the 4bottom thereof. Rotation of the pump ele
ment causes Water to rise and flow into the discharge pipe
due to the action of the spiral vanes and a siphon is
actua-.table means for actuating said element from its nor
mal toward its operated position, and means in said con
thereby initiated. Once rod 196 has been depressed and
the handle released by the operator, spring 198 will bring
said conduit to restrict the cross section or" said conduit to
it back to its initial position at about the same time the
Itank is reiilled by the conventional iioat and water inlet
means (not shown).
This form differs from above embodiments in general
operative principle in only one respect, i.e., instead of
lowering the discharge pipe to the water, the water is
raised to said pipe to initiate the Siphon; and while this
slight difference exists, this modiiication may still be
used with varying water levels since the pump is partially
duit operative iat least Iduring initiation of flow through
assure formation of a water seal iacross said conduit dur
ing initiation of water ilow through said conduit.
2. The combination defined in claim 1 wherein said
conduit is provided with means intermediate the ends
thereof permitting relative axial converging and diverging
movement of the ends thereof, wherein said ele-ment is
ñxed to the upper end of said conduit.
3. The combination 4deiined in claim 2 wherein said
conduit comprises a pair of telescopically interiitting rigid
tubular members interconnected at their overlapping ends
iilled with liquid at all times as shown in FIGURE 7 20 by a thin highly ilexi-bly tubular sleeve.
4. The combination deiined in claim 2 wherein said
when the tank is full.
conduit comprises a pair of telescopically interñtting rigid
In FIGURES l0 and 11, another modiiication is shown
tubular members and wherein said movement permitting
which employs a iloat (not shown) having a tubular
means comprises a liquid joint provided with `a liquid
member 199 similarly as shown in FIGURES l, 5 and 6.
The upper portion of discharge pipe 201 has an annular 25 which is immiscible and insoluble in water, which is non
wetting, and which has a specific >gravity greater' than one.
groove 200 which receives a rubber O-ring 204. Mount
5. The combination deñned in claim 4 wherein the
ed around O-ring 204 is an annular Teilen sealing ring
liquid of said joint is mercury.
208 which has an annular depression 210 for engaging
6. The combinationV defined in claim 2 wherein the said
said O-ring 204 and preventing relative vertical move
ment therebetween. The side of the Teflon ring 20S 30 conduit comprises a pair of tubular rigid members ar
ranged in coaxial relation and wherein said movement per
opposite depression 210 iits iiush against tubular member
mitting means comprises a highly iiexible bellows inter
connecting the adjacent ends of said tubular~ members.
In operation the float is depressed and a siphon is ini
tiated as described in the operation of FTGURE 1. The
water being discharged by downward flow through tube
199 and pipe 201 is prevented from iiowing through the
annular space between the lower portion of tube 199 and
pipe 201 by O-ring 204 and the Teilen ring 20S, but due
to the lubricating effect which the water has on the
7. The lcombination defined in claim 2 wherein said con
duit comprises a pair of telescopically interiitting tubular
members and wherein -said movement permitting means
comprises concentrically arranged sealing structure inter
posed between the opposed surfaces of said members em
bodying an O-ring iixed to one of the said opposed sur
Teflon virtually no friction is encountered by tube 199 40 faces and a Teiion ring interposed between said -O-ring
and the other of said opposed surfaces, said Teñon ring
on ring 203 and the ñoat subsides with `the water level
being fixed to said O-ring and in sliding sealing contact
with said other opposed surface.
The sealing rings 204, 208 also act. as guide elements
S. The combination defined in claim l wherein said
for tube 199 assuring vertical descent of iioat.
`conduit extends through said receptacle outlet opening to
All ‘embodiments of the present invention can be used 45 a position substantially below the bottom of said tank so
in liquid vending or dispensing machines delivering a
that fluid Idischarged through said conduit from said re
measured or unmeasured amount of liquid, or slurry, or
ceptacle is confined within said conduit to a level sub
of a liquid having small suspended particles such as is
st-antially below the bottom of said tank to provide a sub
common in fruit beverages and the like.
stantial pressure diiîerential to maintain proper siphoning
The invention may be embodied in other speciiic forms 50 action.
without departing from the spirit or essential character
9. The combination defined in claim 1 wherein said
istics thereof. The present embodiments are therefore to
restricting means comprises a ilow restricting element dis
be considered in all respects as illustrative and not re
posed in said conduit and movable with said element from
strictive, the scope of the invention being indicated by
a iìow restricting position when said element is in its said
the appended claims rather than by the foregoing descrip 55 normal position to an inoperative position when said ele
tion, and all changes which come Within the meaning and
ment is in its operative position.
range of equivalency of the claims are therefore intended
10. The combination defined in claim 1 wherein said
to be embraced therein.
flow restricting element comprises ya disk disposed trans
What is claimed and desired to be secured by United
versely of said conduit and suspended from said element
States Letters Patent is:
end wall concentrically in said conduit.
1. In combination with a liquid receptacle having a bot
tom outlet opening :open externally of said tank to `atmos
References Qited in the ñle of this patent
phere, a fluid flow outlet apparatus comprising sa tubular
iluid outlet conduit vertically disposed in said receptacle
`and having an open top and its lower end internally dis 65
Miller _______________ __ June 26,
Burgum ______________ __ Feb. 2,
Coburn ______________ __ Dec. 15,
Miller _______________ __ Jan. 1,
Davisson _____________ __ Ian. 23,
element attached to said conduit for vertical reciprocating 70
movement relative to said recetpacle in a predetermined
path lbetween a normal elevated position and ian operated
depressed position and having a top end wall disposed in
spaced relation to the top end of said conduit to permit
fluid to pass between the upper end of said conduit and 75
Cole _________________ __ July 17, 1951
Great Britain _________ __
Great Britain _________ __
Germany ____________ __
France ______________ __
posed to provide iiuid communication with said receptacle
outlet opening and externally connected in ñuid tight rela
tion thereto to prevent iiuid ñow from said receptacle
other` than through said conduit, an inverted cup-shaped
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