CA2354231A1 - Accelerated rim wash for a toilet - Google Patents

Abstract

A fill valve (36) has a main valve (34) with a control chamber (44) for controlling the on and off actuation of the main valve. A tube (58) is in fluid communication with chamber (44) and extends into the water at the fill level (46) in tank (10). The flush valve (64) is connected to tube (58) such that upon actuation it raises tube (58) and lowers the pressure in chamber (44) to turn on the main valve (34) independent of whether the water level in tank (10) drops below its fill level (46) to direct water from the main valve to a rim wash conduit (28). In one embodiment the second end of the tube is connected to a volume expander member having an enlarged diameter to provide for a substantial change in volume as the enlarged diameter volume expander is partially raised above the fill level of the water tank to increase the volume for the air pressure chamber. The lower open end of the volume expander remains below the water level to provide a seal from ambient atmosphere during normal operation of the flush handle.

Description

ACCELERATED RIM WASH FOR A TOILET
This application is a divisional of Canadian patent application serial number 2,014,019 filed April 6, 1990 under the name of Masco Corporation of Indiana.
Technical Field This invention relates to water closets and more particularly to a fill valve flush system for a water closet tank.
Background of the Invention In conventional water closet tanks, a flush valve is positioned near the bottom of the tank and is operable by a flush handle via chains or other mechanical linkages. As the flush valve is opened, the water within the tank drains through the flush valve opening. The water tank also includes a fill valve which often incorporates a float member such as a ball which floats on the water within the tank. Lowering of the water level within the tank lowers the ball to actuate or turn on the fill valve. When the flush valve closes and the tank is refilled, the ball then floats to its shut off position to shut off the fill valve. This system has long been used in water closets and provides for adequate flushing if there is adequate amount of water and water pressure from the tank to the bowl.
Rim flushes for one piece low profile water closets have a separate conduit leading directly from the fill valve to the rim wash ports about the upper perimeter of the bowl. The rim wash line is directly connected to the supply conduit because the low profile of the water tank relative to the bowl does not provide adequate water pressure to the rim ports at the upper perimeter of the bowl. A diverter mechanism is often provided to direct the water from the fill valve to flow through a rim wash conduit during the draining of the tank.

When the tank is emptied and the flush valve closes, the diverter mechanism switches position to close off the rim wash conduit and directs water through a fill pipe (i.e. hush tube) that ends within the tank. The fill valve is actuated by the lowering of the water level within the tank. Operation of the flush handle opens the flush valve which allows draining of the water from the tank hence lowering of the water level within the tank.
Fill valves have also been devised which eliminate the use of ball cocks. These fill valves include an air pressure control chamber in which the rise in water level traps air within the chamber and causes it to be pressurized to shut off the valve mechanism in the fill valve. The main valve mechanism is opened when water in the control mechanism is drained as the water within the tank flows through the open flush valve. A fill valve of this type is described in detail in U.S. patent 4,574,826 and 4,646,779 issued to Dwight Johnson on March 11, 1986 and March 3, 1987, respectively.
In tankless toilets, a flush valve handle directly operates and opens the flush valve for a certain period of time. These flush valves on tankless toilets are common in commercial and institutional settings. However, these valves need a water flow of about 25 gallons per minute to produce an adequate flush in the toilet bowl. Most residential water supply lines are incapable of supplying water at this high rate so tanks are incorporated in most residential toilets.
In low water consumption toilets which are becoming popular either by regulation or by commercial need, the amount of water within the tank is often under two gallons.
Furthermore, the two gallons of water is flushed in a short six second period. This short period of time is often inadequate for the fill valve to actuate and let the water from the actuated fill valve to flow through the rim wash conduit to the rim ports and into the bowl to provide an adequate rim wash during the flush cycle.
What is needed is a tank for a toilet that provides a pressurized rim wash that simultaneously commences with the flush cycle. Furthermore, what is needed is a system which accelerates the actuation of the fill valve such that commencement of rim wash is accelerated relative to the draining of the water in the water tank so that an adequate rim wash occurs during the short flush cycle of the low water consumption toilet without the addition of separate valve mechanisms.
Summary of the Invention In accordance with one aspect of the invention, a toilet tank flushing system includes a fill valve operably mounted within the tank. The fill valve includes a main valve movable between an open and closed position and a control device for closing and opening the main valve. The control device desirably includes a control chamber which is responsive to a predetermined air pressure therein to open the valve when the pressure is below the predetermined amount and closes the valve when the pressure is above a predetermined amount. A
tube has a first end connected with the control chamber and is in air pressure communication therewith. The tube has a second end normally positioned to be submerged in the tank liquid at the fill level of the tank. The second end is operably connected to the flush actuator, commonly a flush handle, such that upon actuation of the flush handle, the second end is raised to significantly increase the volume for the air in the chamber. Consequently, the air pressure is lowered therein.
The control device responds to the lower air pressure and opens the main valve independent of any lowering of the liquid level in the tank.

In one embodiment the second end of the tube is connected to a volume expander member having an enlarged diameter to provide for a substantial change in volume as the enlarged diameter volume expander is partially raised above the fill level of the water tank to increase the volume for the air pressure chamber. The lower open end of the volume expander remains below the water level to provide a seal from ambient atmosphere during normal operation of the flush handle.
In one embodiment, the tube has a second end which is raised above the fill level in the water tank to allow the air pressure within the chamber to be in communication with the ambient atmosphere and to allow the chamber to lower its pressure down to ambient atmosphere and thus turn on the main valve independently of lowering the water from the fill level in the tank.
The invention may be summarized as a volume expander member for a fill valve, said member characterized by: a nozzle fitting section for sealing connection to a tube; an enlarged bell section having a lower open downwardly facing end; a transition section between said nozzle and bell section and positionable at a fill level of a tank; a fastener means section laterally disposed relative to said nozzle transition and bell section for fastening onto a flush actuator member.
Brief Description of the Drawings Reference now will be made to the accompanying drawings in which:
Fig. 1 is a front elevational and partially segmented view of a toilet tank in accordance with one embodiment of the invention showing the valve in the off position and the toilet tank in the filled mode;

Fig. 2 is a view similar to Fig. 1 showing the main valve in the on position and the flush valve opened;
Fig. 3 is a view similar to Fig. 2 showing, in schematic, the attachment of the tank outlet to the bowl and the rim wash conduit to the rim port with the toilet tank being in the refilling mode;
Fig. 4 is a fragmentary view of a toilet tank showing an alternate embodiment of the invention with the toilet tank in the filled mode;
Fig. 5 is a view similar to Fig. 4 showing the main valve in the on position and the flush valve opened;
Fig. 6 is an enlarged side elevational view of the volume expander shown in Fig. 4; and Fig. 7 is an enlarged cross sectional view taken along the lines 7-7 in Fig. 5.
Detailed Description of the Preferred Embodiments Referring to Fig. 1, a toilet tank 10 has a flush outlet 12 at the bottom thereof. A flush valve 18 incorporates a flapper 14 that is mounted for pivotal movement onto prongs 16. The flush valve seat assembly 18 has a conventional overflow pipe 20. The flush valve 14 is connected via chain 22 to a diverter assembly 26 of the type found in U.S. patent 4,318,194 issued to David L. Pinkston on March 9, 1982. The diverter 26 has one outlet connected to a rim wash conduit 28 and a refill pipe 30 commonly called a hush pipe. Its inlet 32 is connected to a main valve section 34 of fill valve assembly 36 which is of the type disclosed in previously mentioned U.S.
patent 4,574,824 to Johnson.
The main valve section 34 sits on top of a stem section 38 which is operably connected to a supply conduit 40.

The main valve 34 is controlled by a diaphragm as taught by the Johnson patent which is in communication with the probe 42 that is cylindrical and hollow and forms a control chamber 44. The probe extends downward to substantially below the fill level as indicated by line 46. An optional cup member 48 is attached to the bottom of the probe and forms an open inlet 50 as disclosed and claimed in a United States Patent 4,887,635 entitled "Fluid Fill Valve With Accurate Fill Level Mechanism" by Dwight Johnson and commonly assigned with the present application.
The control diaphragm is responsive to pressure in chamber 44 which corresponds to compression of air resulting from a rise of liquid from the bottom 49 of probe 42 to a response level as indicated by line 54. In turn, response level 54 is achieved by water at the fill level 46 flowing through opening 50 in cup 48 to chamber 44.
The probe 42 has a nozzle 56 which connects to a tube 58 which extends through an opening 60 of actuator arm 62 that is connected to a flush handle 64. The tube 58 is secured through the opening 60 in arm 62 and has an end section 66 normally submerged under fill level 46. The tube is hollow and is in fluid communication through nozzle 56 with chamber 44.
The tube is made from a semi-flexible material such as vinyl or ethylene propylene.
As shown in Fig. 2, the handle 64 can be operated so that it pivots and causes actuator arm 62 to pivot upwardly.
The upward motion of the actuator arm 62 causes lower end 66 to lift up above fill level 46 and expose the end 66 and chamber 44 to ambient atmosphere. Control chamber 44 consequently loses its elevated pressure and the lower pressure causes the control diaphragm to open the main valve section 36.
Simultaneously actuate arm 62 pivots diverter arm 24 upwardly which in turn pulls the flapper 14 to its open position as shown in Fig. 2 via chain 22. The weight 25 on arm 24 opens the passage to rim wash conduit 28. The main valve 34 is open and water then flows through the inlet 32 and through rim wash 28.
Referring now to Fig. 3, the rim wash conduit 28 is connected to a plurality of ports 68 about bowl 70. The flush valve passageway 12 is connected to a jet way 72 directed toward the bottom portion of bowl 70. Referring back to Fig.
2, it could be seen that the rim wash via conduit 28 and port 68 is started simultaneously with the water within the tank 10 flowing through outlet 12 and before the water is lowered from fill level 46. The main valve 34 stays on even after flush handle 64 is released and actuating arm 62 under its own weight pivots the handle 64 back to the position shown in Fig. 1. The flapper 14 due to its buoyancy is maintained in position shown in Fig. 2 until the water drains through the flush valve 18 and discharge outlet 12. Meanwhile the water within cup 48 drains through a check valve 51 at the bottom thereof.
When the water is lowered beyond the bottom end of cup 48 and near the valve seat rim 74 at level indicated by 96, the flapper 14 closes onto the rim 74 to close the flush valve 18. The closing of flush valve 18 pulls the arm 24 via chain 22 back to the position shown in Fig. 3. The diverter assembly 26 now directs water through the hush pipe 30 to refill the tank as shown in Fig. 3 past level 76. The lower end 66 of tube 58 is now sealed within the water in tank 10. Water continues to refill the tank to the fill level 46 shown in Fig.
1 at which point the chamber 44 becomes repressurized due to the fact that lower end 66 is now sealed within the water in tank 10 and water flows through opening 50 into the control chamber 44. At this point the tank achieves the ready mode as shown in Fig. 1 and is ready for another flush.

An alternate embodiment is shown in Figs. 4 and 5 wherein the tube 58 has its end 66a connected via a nozzle fitting 86 to an enlarged volume expander member 82 having an increased diameter. The expander has a lower open end 84 and an upper nozzle fitting 86. The fitting 86 sealingly fits second end 66a of tube 58. As shown more clearly in Figs. 6 and 7, the volume expander 82 made from a rigid plastic such as polyolefin has a threaded receptor section 88 capable of receiving a fastener 90 through hole 60 in arm 62. A shoulder 92 is adjacent the threaded receptor 88 and positioned to abut the edge of arm 62 to prevent rotation of member 82 with respect to arm 62. The member 82 has a transition section 93 and an enlarged bell section 95 directly leading to the open end 84. A support rib 97 reinforces the connection of the laterally disposed receptor section 88 with the transition section 93 and bell section 95 to provide a rigid member.
Aperture 99 is below receptor section 88 in rib 95 to allow the use of longer screws to pass through section 88. The enlarged section 95 is completely submerged below fill level 46 in the normal off position. The open end 84 is normally below flush rim 74.
Upon operation of the flush handle 64 as shown in Figure 5, the tube 58 is raised such that enlarged section 95 becomes partially placed above fill level 46 such that a substantial increase in effective chamber volume occurs above water level 46 to decrease the pressure within chamber 44 of probe 42. Even though the open end 84 does not become exposed to the ambient air, the pressure within chamber 44 drops a sufficient amount to turn on the main valve 34. The actuation of flush handle 64 and the raising of lower section 82 provides for the main valve 34 to turn on even before the level of water within tank 10 is lowered from the fill level 46.

The flush handle 64 is normally released soon after actuation such that the arm 62 swings back to the position shown in Fig. 4. The volume expander member 82 is also dropped with the release of flush handle 64. The lower end 84 is thus positioned below valve seat rim 74 and is always submerged within water in the tank 10. As the tank 10 is refilled when flush valve 14 is closed, the water then refills bell section 95 and the air within tube 82 will back up through chamber 44 and pass out from under now open end 49 of probe 42. As water reaches the fill level 46, it flows through cup 50 to shut off the main valve 34 by increasing pressure in chamber 44. The volume expander 82 does not significantly affect the air pressure control during the shutting off operation since the expander is substantially submerged in water.
It is noted that the volume of air in tube 58 and upper end of transition section 93 is relatively minor compared with the volume of air in chamber 44. Therefore the response levels 54 in chamber 44 are substantially the same and do not substantively change the shut off operation relative to a valve that did not have tube 58.
Both of the described embodiments allow for the main valve 34 to turn on before the water level drops from the fill position 46. Extra time is provided for water from the main valve 34 to pass through the rim wash conduit 28 under line pressure to a rim port 68. An adequate rim wash is actuated independently from a drop in the tank water level. By elimination of the need for water in the tank to drop a significant degree and waiting for the main valve 34 to be actuated by a drop in the water level, the rim wash gets the needed water at an accelerated time frame relative to conventional flush valve systems. The early rim wash before the drop of the tank water level provides for a more efficient use of the water through the rim and provides for a cleaner bowl after each flush. With this rim wash system and using an accelerated main valve actuation, adequate flushes with as little as 1.6 gallons of water are possible without the necessity of using special air sealed tanks, extra valves, or other electrical accessories that have been found in more exotic and cumbersome water saving toilets. Further, a low profile tank situated substantially behind the bowl can also be used with the above described instant on fill valve.
It should be noted that the described fill valve incorporates a control chamber that operates on air pressure.
It is also foreseen that mechanical actuation of a fill valve that incorporates floats to turn off the fill valve is also possible. It is also foreseen that other valves besides a fill valve may be used to direct water to the rim wash.
Variations and modifications of the present invention are possible without departing from the scope and spirit as defined in the appended claims.

Claims

CLAIMS:

1. A volume expander member for a fill valve, said member characterized by:
a nozzle fitting section for sealing connection to a tube;
an enlarged bell section having a lower open downwardly facing end;
a transition section between said nozzle and bell section and positionable at a fill level of a tank;
a fastener means section laterally disposed relative to said nozzle transition and bell section for fastening onto a flush actuator member.