GB2589304A

GB2589304A - Toilet system

Info

Publication number: GB2589304A
Application number: GB1915326.1A
Authority: GB
Inventors: Paul Mason Andrew
Original assignee: Marc Francis Taylor
Current assignee: Marc Francis Taylor
Priority date: 2019-10-23
Filing date: 2019-10-23
Publication date: 2021-06-02
Also published as: GB201915326D0

Abstract

A toilet system 2, including a cistern 8 and an extraction system 4, that has a conduit 40 within the cistern 8 with an outlet (34 figure 3) arranged through an aperture at the base of the cistern and which also has a suction system 20 which may be located below the conduit outlet. The system may have an overflow mechanism 42 that may be separate from the conduit outlet and a dual flush. The toilet may have a control system (26 figure 2) to operate the suction system and the suction level may be varied. An extraction system where the suction system is coupled to inlets (86 figure 6) on the underside of the toilet seat and an extraction system coupled to an inlet (120 figure 13) on the toilet bowl rim (112 figure 13) is also disclosed. Methods of fitting the extraction systems are also specified.

Description

TOILET SYSTEM

TECHNICAL FIELD

The present disclosure relates to a toilet system having a gas extraction system. BACKGROUND Toilet ventilation systems have been developed to extract gaseous odours from the vicinity of a toilet, which comprises a cistern and bowl interconnected by a flush passageway. Examples of toilet ventilation systems are provided by GB 2319268 A (referred to herein as "Hawkins"). Hawkins describes systems in which an air suction device is connected to a flushing system of the cistern, to draw the gaseous odours from a bowl of the toilet via the flush passageway. A drawback of the implementation of Hawkins is that it may be difficult to fit to a variety of different cistern and flushing mechanism designs, including modern dual flush cisterns.

Therefore, in spite of the effort already invested in the development of said toilet systems, further improvements are desirable.

SUMMARY

The present disclosure provides a toilet system comprising: a toilet having a cistern and a flushing system, wherein the flushing system comprises a flush valve to regulate liquid in the cistern into a flush passageway; and an extraction system, wherein the extraction system comprises: a conduit arranged within the cistern having an inlet in fluid communication with the flush passageway, e.g. it is directly coupled thereto, and an outlet arranged in the cistern, and a suction system configured for fluid communication with the outlet to extract gas through the conduit from a region in fluid communication with the inlet. Said region may comprise the flush passageway that interconnects with a rim of a bowl of a toilet basin.

By extracting gas through a conduit which is in fluid communication with the flushing passageway, the flushing passageway is provided with additional functionality to enable odour removal, while also maintaining its original function of providing a passageway for dispensing liquid into the bowl.

In embodiments, the conduit is sealed between said inlet and outlet to prevent fluid in the cistern entering the conduit. By providing a conduit that is watertight within the cistern, a more efficient system is provided since all of the suction is directed through to the flushing passageway, in order to remove gas from the bowl. In contrast, Hawkins teaches that the conduit should be open within the cistern in order to provide a two way air valve. This results in air mainly being drawn from the cistern when the liquid in the cistern is lower than a certain height (e.g. while refilling with water after flushing), rather than being drawn from the toilet bowl itself.

Implementing a sealed conduit may also provide a more durable and robust system since liquid from the cistern cannot enter the conduit and/or interfere with the effectiveness of the suction system. In contrast, some arrangements in Hawkins (e.g. Figs 17-18) illustrate a conduit that directs overflow liquid toward the air suction device, thereby potentially reducing the effectiveness of gas extraction by blocking the conduit, and also risking damage to the suction system! requiring unnecessary cleaning of the suction system.

In embodiments, the outlet and/or suction system are arranged at a base of the cistern. In embodiments, the suction system is located below the outlet of the conduit. By positioning the outlet and/or suction system near a lower portion of the cistern, these components may be conveniently and discretely arranged near the soil vent pipe (SVP). Furthermore, this may enable gravity to assist with extraction, thereby improving the efficiency of fluid, e.g. gas, removal.

In contrast, most arrangements in Hawkins include an outlet and air suction device located near the upper portion of the cistern. Although one arrangement includes an outlet at the base of the cistern (Fig 18 of Hawkins), this is only in combination with the two way air valve, which still presents the aforementioned problems associated with said two way air valves.

In embodiments, the cistern further comprises an overflow mechanism to regulate a height of the liquid in the cistern, the overflow mechanism to direct overflow liquid held by the cistern to external the cistern through an aperture in the cistern. In this manner, the liquid in the cistern may be maintained at a suitable height, and overfill may be prevented.

In embodiments, the aperture is arranged at the base of the cistern. By providing the aperture in a lower portion of the cistern, an outlet of the overflow mechanism may be conveniently located nearer the SVP.

In embodiments, the aperture is separated from an aperture of the outlet of the conduit. By providing a separate overflow mechanism which is distinct from the conduit. liquids and gases may be efficiently removed through different fluid pathways without interfering with each other.

In embodiments, the overflow mechanism comprises a valve to regulate fluid from entering the cistern. The valve may prevent overflow liquid (e.g. water) from returning into the cistern from the overflow mechanism. Furthermore, the valve may prevent gas (including foul odours) from entering the cistern from the SVP or other piping. In embodiments, the valve is a float valve.

In embodiments, the flushing system comprises a dual flush system that regulates the liquid in the cistern with a first mode and second mode, wherein the first mode dispenses less liquid than the second mode. Hawkins does not disclose an extracting system that is implemented with a dual flush system.

In embodiments, the toilet system comprises a control system having an input unit, wherein the control system is configured to control the operation of the suction system based on a signal from the input unit. In this manner, the suction system may be automatically controlled to extract gas from the toilet. The suction system controlled by the control system may be implemented with any of the embodiment extraction systems disclosed herein.

In embodiments, the control system comprises a processor which receives a signal from the input unit and then sends a control signal to operate the extraction system, e.g. via a relay or other electrically operated switch. In other embodiments, input unit sends the control signal directly to the extraction system.

In embodiments, the input unit comprises a remote control or switch, usable to manually provide the input. Accordingly, a user may control when the suction system operates. In embodiments, the input unit comprises a light switch for a room in which the toilet system is arranged. By configuring a light switch as the input unit, the suction system may conveniently be configured to turn on when a user turns on a light switch in the room.

In embodiments, the input unit comprises a sensor connected to the toilet. For example, the input unit may be connected on the cistern or seat. The sensor may comprise a motion sensor, pressure sensor, and/or light sensor. By having a sensor coupled to the toilet, the sensor may autonomously detect when a user is in proximity with (and thus likely to use) the toilet, in order to activate the suction system without user intervention.

In embodiments, the control system is configured to send a control signal to vary a suction level of the suction system based on the received input signal. In this manner, a higher suction may be utilised when desired, to extract more gas / odours.

In embodiments, the suction system comprises a pump or a fan. For example, the suction system may comprise a vacuum pump, rotary pump and/or a reciprocating pump.

In embodiments, there is provided a toilet seat and an extraction system, the extraction system having: a conduit system coupled to the toilet seat, the conduit system comprising one or more inlets in fluid communication with a region proximal the toilet seat and an outlet; and a suction system configured for fluid communication with the outlet to extract gas through the conduit system from a region in fluid communication with the inlet.

An extraction system as part of a toilet seat may be more convenient to implement since it does not require modification of the cistern. The extraction system, and particularly the suction system, may include any of the features described above with reference to the toilet cistern embodiments.

In embodiments, the one or more inlets are in fluid communication with the underside of the toilet seat. In this manner, the suction system may extract gas from a region near the underside of the toilet seat, i.e. from a region which is near to the odour source.

In variant embodiments, which are not illustrated, the one or more inlets may be in fluid communication with a different region of the toilet seat, e.g. an upperside of the seat.

In embodiments, the conduit system comprises a first conduit and a second conduit, wherein the first conduit and second conduit each comprise: an inlet in fluid communication with a region proximal the toilet seat; and an outlet configured for fluid communication with the suction system. By having two inlets in fluid communication with a region of the toilet seat, odours may be extracted from two regions, thereby further improving the effectiveness of odour removal. In embodiments, the two inlets are both in fluid communication with the underside of the toilet seat.

This arrangement provides for more effective odour removal, since the underside is of the seat is closer to toilet bowl when in use.

In embodiments, the respective inlets of the first and second conduits are located at opposing sides of the toilet seat. As used herein, the term "opposing sides" is defined relative to a central hole of the toilet seat, e.g. across a diameter of the toilet seat. For example, one inlet may be arranged at a left side of the toilet seat, and the other inlet may be arranged at a right side of the toilet seat.

In embodiments, the conduit system includes an underside of the toilet seat defining a circumferential cavity extending along the seat, which is closed by a closing member, the closing member comprising one or more apertures for extraction of gas into the cavity. By implementing a closing member that closes a cavity extending along a perimeter of the seat, suction may be more evenly distributed around the toilet, and gas may be extracted from a larger/more appropriate region.

As used herein, the one or more "apertures" of the closing member may also be referred to as one or more "perforations" and/or one or more "inlets" of the conduit.

In embodiments, the closing member is removably coupled to the underside of the toilet seat. In this manner, the closing member may be easily detached for convenient cleaning of the toilet seat and closing member.

In embodiments, the apertures are circumferentially distributed around the underside of the toilet 20 seat.

In variant embodiments, which are not illustrated, the closing member may include only a single aperture, e.g. an elongate hole which partially extends along the closing member.

In variant embodiments, which are not illustrated, the closing member may be unperforated, and the one or more apertures may comprise one or more gaps between the closing member and the toilet seat e.g. near the inner periphery of the toilet seat.

In embodiments, the apertures are arranged offset from a centre line along which the circumferential cavity extends, towards an interior side of the closing member / toilet seat. By providing the apertures nearer an inner periphery of the toilet seat, this facilitates extraction of gas from the interior of the toilet bowl, e.g. rather than from the outside of the toilet.

In embodiments, the apertures are angled towards the inner periphery of the seat, such that when in use, the apertures are directed toward the toilet bowl. In this manner, the gas inside the bowl (rather than external from the bowl) may be more efficiently extracted toward the suction system.

In embodiments, the toilet seat includes one or more stops that extend from the underside to abut a rim of the bowl, wherein the one or more stops extend beyond the apertures. In this manner, the apertures may be prevented from abuting the rim of the bowl, and a gap may be provided between the apertures and the bowl to facilitate gas flow through the apertures. The stops may also ensure that the closing member does not rest on the toilet, thereby reducing the risk of damage to the closing member.

In embodiments, the toilet seat further comprises one or more installation apertures to receive the conduit and thereby couple the conduit to the toilet seat. In this manner, the conduit may be conveniently attached to the toilet seat.

In embodiments, the conduit is flexible in operative proximity to the installation apertures to accommodate movement of the seat between an upward and downward position. In this manner, the seat may be raised and lowered without damaging the conduit or impeding gas flow therethrough.

In embodiments, there is provided a toilet bowl and an extraction system, the extraction system comprising: a conduit arranged within the bowl having an inlet in fluid communication with a region inside of the bowl and an outlet arranged through an aperture in the bowl, and a suction system configured for fluid communication with the outlet to extract gas through the conduit from the region in fluid communication with the inlet.

The extraction system may include any of the features described above with reference to the toilet cistern and/or toilet seat embodiments.

In embodiments, there is provided a toilet system comprising one or more of 1) the cistern and corresponding extraction system, 2) the toilet seat and corresponding extraction system, and/or 3) the toilet bowl and corresponding extraction system discussed above. The cistern, toilet seat, and/or toilet bowl may be provided with the same suction system, or with different suction systems.

The present disclosure also provides methods for fitting, which may include retrofitting, an extraction system to a toilet cistern, toilet seat, and/or toilet bowl.

In embodiments, there is provided a method of fitting, which may include retrofitting, an extraction system to a cistern of a toilet, the cistern comprising an overflow system having an inlet for receiving overflow fluid in the cistern and an outlet for dispelling the overflow fluid into a passageway, the passageway to receive liquid dispensed from a flushing system, the method comprising: forming an aperture as an outlet in the cistern; fluidically connecting the overflow system to the outlet formed by the aperture; and connecting a suction system in fluid communication with the outlet formed by the aperture to extract gas through from the passageway. In this manner, the existing overflow mechanism can be repurposed as part of a conduit for a gas extraction system. Method steps disclosed herein may be performed in any suitable order.

In embodiments, the aperture is formed as an outlet in a base of the cistern.

In embodiments, the method comprises installing a replacement overflow mechanism. The replacement overflow mechanism may be configured as described with reference to the toilet systems herein. In embodiments, the replacement overflow mechanism comprises a valve to regulate fluid from entering the cistern.

In embodiments, the method comprises forming an aperture as an overflow outlet in the base of the cistern, and fluidically connecting the replacement overflow mechanism to the overflow outlet.

In this manner, an overflow mechanism may be provided which is separate from the conduit.

In embodiments, the method comprises connecting the suction system and/or replacement overflow system to a SVP.

In embodiments, there is provided a method of fitting, which may include retrofitting, an extraction system to a toilet seat, the method comprising: arranging a conduit to have an inlet in fluid communication with an underside of a toilet seat; connecting a suction system in fluid communication with the conduit to extract gas through the conduit from a region in fluid communication with the inlet. In this manner, the toilet seat can be modified to include ventilation means.

In embodiments, the method comprises forming an aperture in the toilet seat and inserting the conduit through the aperture. In this manner, at least a portion of the conduit may be securely fastened to the seat.

In embodiments, the method comprises removably coupling a closing member to the toilet seat, wherein the closing member closes a cavity defined by an underside of the toilet seat, the closing member comprising one or more apertures for extracting gas into the cavity.

The present disclosure also provides a method of cleaning the toilet seat and/or extraction system, the method comprising steps of 1) removing a closing member; 2) cleaning the toilet seat and/or closing member; and 3) reattaching the closing member.

The methods described herein can implement any of the features of the toilet systems, toilet seats, and/or extraction systems described herein.

The present disclosure provides a toilet bowl and an extraction system. The bowl comprising: an outlet at a base for extraction of liquid in the bowl to a soil vent pipe, and; a flush passageway that interconnects with a flush outlet at a rim of the bowl to transmit liquid flushed from a cistern into the bowl. The extraction system comprising: a conduit arranged within the bowl having an extraction inlet in fluid communication with a region inside of the bowl and an extraction outlet arranged through an aperture in the bowl, and; a suction system configured to connect in fluid communication with the extraction outlet to extract gas through the conduit from the region in fluid communication with the inlet.

By implementing an extraction system having an extracting inlet of an interior wall that defines the interior of the bowl, gas can be extracted from the bowl in use.

In embodiments, wherein the extraction inlet and the flush outlet of the rim are arranged with liquid transmitted from the flush outlet to enter the interior of the bowl without entering the extraction inlet. By arranging the extraction inlet so that fluid flushed from the flush outlet cannot, in normal use, enter the extraction inlet, the inlet can remain clean and unobstructed.

In embodiments, the extraction inlet is arranged on the rim. By arranging the extraction inlet in the rim the extraction inlet may be conveniently concealed. In embodiments, the extraction inlet is arranged on the rim and radially inward (i.e. in respect of a circumference of the bowl about which the rim extends as an annulus about the centre) of the flush outlet. By implementing the extraction inlet radially inward of the rim, fluid flushed from the flush outlet may be projected on to the interior wall of the bowl, rather than over/into the extraction inlet.

In embodiments, the extraction inlet extends around an interior wall of the bowl. In embodiments, the extraction inlet is circumferentially distributed around the interior wall of the bowl. A circumferential distribution of the extraction inlet may increase the area that gas can be extracted from. In embodiments, the extraction inlet is arranged as a plurality of apertures through the interior wall of the bowl. A plurality of apertures of the extraction inlet (which can be circumferentially distributed) may increase the area that gas can be extracted from.

The preceding summary is provided for purposes of summarizing some embodiments to provide a basic understanding of aspects of the subject matter described herein. Accordingly, the above-described features are merely examples and should not be construed to narrow the scope or spirit of the subject matter described herein in any way. Moreover, the above and/or proceeding embodiments may be combined in any suitable combination to provide further embodiments.

Other features, aspects, and advantages of the subject matter described herein will become apparent from the following Detailed Description, Figures, and Claims.

BRIEF DESCRIPTION OF THE FIGURES

Aspects, features and advantages of embodiments of the present disclosure will become apparent from the following description of embodiments in reference to the appended drawings in which like numerals denote like elements.

Figure 1 is a side cross-sectional view showing an embodiment toilet system comprising a toilet cistern and an extraction system, which may have been retrofitted to the cistern.

Figure 2 is a front cross-sectional illustrative view showing a conventional toilet cistern without the extraction system shown in figure 1.

Figure 3 is a front cross-section illustrative view showing the toilet system of figure 1. Figure 4 is a top cross-section illustrative view showing the toilet cistern of Figure 3. Figure 5 is a perspective view showing the toilet system of figure 1.

Figure 6 is a side cross-sectional view showing an embodiment toilet system comprising a toilet bowl and seat and an extraction system, which may have been retrofitted to said seat.

Figures 7 and 8 are perspective views showing the toilet system of Figure 6.

Figures 9 and 10 are illustrative top and front cross sectional views showing the toilet seat of Figures 6 to 8.

Figures 11 and 12 are illustrative side cross-sectional and side views showing a suction system of the extraction system of the preceding figures.

Figure 13 is a sectional view of an embodiment toilet system comprising a toilet bowl and an extraction system.

DETAILED DESCRIPTION OF EMBODIMENTS

Before describing several embodiments of the apparatus, it is to be understood that the system is not limited to the details of construction or process steps set forth in the following description.

It will be apparent to those skilled in the art having the benefit of the present disclosure that the system is capable of other embodiments and of being practiced or being carried out in various ways.

The present disclosure may be better understood in view of the following explanations: As used herein, the term "toilet system" may refer to a system comprising a toilet and an extraction system. The toilet includes a device used for collection of human waste, it is typically not portable. A toilet includes a cistern and a bowl, which are interconnected by a passageway.

As used herein, the term "retrofit" may refer to any system which is adapted or modified from its original configuration in which it may be first sold to a customer. For example, a toilet cistern or a toilet seat may be retrofitted with additional components of an extraction system.

In variant embodiments, which are not illustrated, the toilet systems (e.g. the toilet cisterns and/or toilet seats) described herein may not be retrofitted, but may instead be provided or sold in the configuration already including an extraction system or part thereof (e.g. including only the conduit system, with the suction system being sold separately).

As used herein, the term "float valve" or "ballcock" may refer to a valve configured to regulate the flow of water from an inlet, e.g. into a toilet cistern. The float valve may rise with the water level in the cistern until a lever of the float valve is activated to turn off the water supply.

As used herein, the term "dual flush" may refer to a flushing mechanism having at least two flush modes. A dual flush system may include a flush selector to select a flush mode, which is actuated by a user. For example, one setting may correspond to a relatively large volume of water (e.g. 6 to 3 or 4.5 litres), and the other setting may correspond to a relatively smaller volume of water (e.g. 3 litres or less).

As used herein, the term "suction system" may refer to one or more devices which exert a suction force to extract fluid, e.g. gas, from a toilet system or part thereof. Suction systems may include pumps, fans, and/or vacuums.

As used herein, the term "fluid" may refer to a liquid or a gas. For example, it may refer to water and/or gaseous odours in the toilet system.

As used herein, the term "conduit" or "channel" refers to a pathway through which fluid may flow.

For example, a conduit may be a tubular conduit having at least one inlet and at least one outlet, e.g. a flexible pipe. Alternatively or in combination, a conduit may comprise a cavity defined, at least in part, by a portion of a toilet. The conduit may include a closing member which defines a boundary of the cavity.

The inlet(s) and/or outlet(s) of the conduit may comprise one or more perforations in the conduit, and/or may comprise one or more openings in the ends of the conduit.

As used herein, the term "conduit system" may refer to a system having one or more conduits.

For example, the conduit system may include one or more tubular conduits, each tubular conduit having at least one inlet and at least one outlet. The conduit system may include a conduit defined by a closing member and a portion of the toilet system, e.g. an underside of the toilet seat, or a portion of the toilet bowl, such as a rim of the toilet bowl.

As used herein, the term "closing member" may refer to a component configured to couple to a toilet or toilet seat to define a fluid pathway between the closing member and the toilet/seat. In some examples, the closing member may also be referred to as a "cover" or a "plate".

As used herein, the term "circumferential" may refer to a direction extending around at least a part of a perimeter or boundary. This is not limited to a circular direction. A circumferential direction can be any shape, e.g. circular, oval, or square, or a combination hereof. For example, a "circumferential cavity" of the toilet seat refers to a cavity which extends at least partially around the toilet seat.

As used herein, the terms "upper side" and "under side" may refer to oppositely-facing sides of a toilet seat. These might not necessarily always be upwardly or downwardly facing. For example, they may be sidewardly facing along the interior and exterior edges of the seat, as shown in Figure 10.

As used herein, the term "processor" or "processing resource" may refer to one or more units for processing including as an ASIC, microcontroller, FPGA, microprocessor, digital signal processor (DSP) capability, state machine or other suitable component. A processor may include a computer program, as machine readable instructions stored on a memory and/or programmable logic. The processor may have various arrangements corresponding to those discussed for the circuitry, e.g. on-board and/or off board the apparatus as part of the system.

As used herein the term "control system" may refer to one or more of: control circuitry; data storage; processor, which are implemented to control the suction system of the extraction system, e.g. based on an input from an input unit. The suction system may be controlled by control of electrical current suppled thereto from an electrical power supply, e.g. in magnitude and/or on/off. Said control may be based on feedback from an input unit. The control system may include an input unit.

As used herein, the term "input" or "input unit" may refer to a device implemented to trigger operation of the suction system, e.g. in response to a user interaction. Examples include a light switch; proximity sensor (including an infrared sensor); a pressure sensor, which may be implemented to determine a user sitting on the toilet.

Toilet system Referring to Figures 1 and 6, a toilet system 2 comprises an extraction system 4 and a toilet 6. The toilet 6 includes a cistern 8 and a bowl 10. A flushing passageway 12 fluidically connects the cistern 8 and the bowl 10 to enable a flushing system 14 to dispense liquid (e.g. water) from the cistern 8 into the bowl 10 through the passageway 12. The cistern 8 is arranged as a hollow receptacle for carrying liquid to be flushed into the passageway 12. The cistern 8 is implemented as side walls and a base and top wall. The base wall and top wall are separated in a height direction by the side walls. The sidewalls are arranged as opposed pairs, which are separated in the longitudinal and lateral directions. The toilet 6 further includes a seat 16 (shown in Figure 6) which is pivotably attached to the bowl 10 proximal a base of the cistern 8. A lid 18 is pivotably attached to the bowl 10 proximal a base of the cistern 8.

The extraction system 4 includes a suction system 20 in the form of a vacuum pump, which is connected to a power source, which may comprise a mains electrical supply. The suction system 20 is coupled between the toilet system and a soil vent pipe (SVP). Thus, the suction system 20 extracts gas from the toilet system to the SVP.

In embodiments having a modified cistern 8 as discussed following, the extraction system 4 extracts gas from the toilet bowl through the flushing passageway 12, such that the flushing passageway 12 operates both as an outlet to dispel water into the bowl 10 and as an inlet to draw gas into the extraction system 4. Referring to Figure 1, the direction of gas extraction is illustrated by dashed arrows, and the direction of water flow when flushing the toilet is illustrated by solid arrows. The direction of water flow in the passageway is opposite the direction of gas extraction and does not flow through the suction system.

In embodiments having a modified toilet seat 16 as discussed following, the extraction system 4 extracts gas through a passageway of the toilet seat 16. These embodiments may be used alone or in combination with each other.

Adapted cistern with extraction system Figures 2 and 3 illustrate a toilet cistern 8 before and after retrofitting with an extraction system 4. The cistern 8 houses a flushing system 14 having a body 22, which houses a flush valve 24, and a portion of the flushing passageway 12 proximal a base of the cistern 8. When open, the flush valve 24 permits liquid to flow from the cistern 8 into the bowl 10 through the flushing passageway 12.

The flushing system 14 is a dual flush system and the valve 24 is dual flush valve. In variant embodiments, which are not illustrated, alternative flushing systems may be used, e.g. single flush systems.

A flush control 26 is actuatable by a user through a top of the cistern to control the operation of the flush valve 24. Since the flushing system 14 is a dual flush system, the flush control 26 includes two buttons, each corresponding to a different volume of water. In variant embodiments, which are not illustrated, the flush control may have other configurations, e.g. it may comprise a lever or a single button, or it may be automated by incorporating a motion activated sensor.

In Figure 2, the cistern 8 includes a conventional overflow system 28. The conventional overflow 28 is fluidically connected with the flushing passageway 12 and may be integrally formed with the flush body 22. The conventional overflow 28 includes an inlet 30 for receiving overflow liquid from the cistern 8, and an outlet 32 for dispensing said overflow liquid into the portion of the passageway 12 housed in the cistern. The conventional overflow 28 extends in the height direction from the outlet 32 to the inlet 30. The conventional overflow 28 may also be referred to as an "internal overflow", since it drains internally into the toilet bowl through the flushing passageway 12 rather than e.g. into an external pipe leading to an SVP.

In variant embodiments, which are not illustrated, the conventional overflow 28 may be configured differently, e.g. it may be separate from the flushing system 14.

Referring to Figures 3 -5, in order to retrofit the cistern 8 with an extraction system 4, an outflow aperture 34 is formed in the base wall of the cistern 8. A connection conduit 36 is installed within the cistern 8 to extend in a first portion from outflow aperture 34 in the height direction to proximal a height of the inlet 30 of the conventional overflow 28. In a second portion the connection conduit 36 includes a U-formation to interconnect the first portion to the outlet 28 of the conventional overflow 28. The connection conduit 36 and conventional overflow 28 are connected by any suitable attachment system, including press fit, screw fit or adhesive. Accordingly, the connection conduit 36 is fluidically connected to the conventional overflow 28.

In variant embodiments, the connection conduit extends beyond the outflow aperture to provide an extension to connect with the suction system, as will be discussed. In embodiments, the outflow aperture is formed elsewhere in the walls of the cistern, e.g. in a side wall or top wall, and the connection conduit is correspondingly arranged.

A suction system 20 (shown in Figure 1) is fluidically connected to the connection conduit 36 to extract gas from the flushing passageway 12 through the outflow aperture 34. Hence, the direction of fluid flow through the conventional overflow 28 is reversed after retrofitting, such that after retrofitting, the original outlet 32 may be considered an inlet, and the original inlet 30 may be considered an outlet.

The conventional overflow 28 and connection conduit 36 together form a single extraction conduit 40 of the extraction system 4, which is fluidically sealed between an inlet 32 and outflow aperture 34 to prevent fluid in the cistern 8 entering the extraction conduit 40.

Since the extraction conduit 40 extends above the height of the liquid in the cistern 8 (which is set by the overflow 42 as will be discussed) liquid that could enter the extraction conduit 40 and travel beyond the second portion of the connection conduit 36 (in thereafter into the suction system) is minimised. Such liquid could enter the extraction conduit during flushing or overflow of the bowl.

Since the conduit 40 is sealed within the cistern 8, the conventional overflow 28 is no longer usable as an overflow system after retrofitting. Hence, a replacement overflow 42 is installed. Unlike the conventional overflow 28, the replacement overflow 42 is an externally draining overflow, i.e. it drains through a conduit external the toilet rather than in to the flush passageway 12 and through the toilet bowl 10. In variant embodiments, which are not illustrated, the replacement overflow may drain internally, similarly to the original overflow, e.g. by fluidically connecting the replacement overflow to the flushing passageway.

The replacement overflow 42 is implemented as a conduit with an opening for receiving overflow liquid from the cistern 8, and an outlet for dispensing said overflow liquid to external the cistern.

The replacement overflow 42 extends in the height direction from the outlet to the inlet.

The opening is arranged above a predetermined height of liquid (e.g. water) in the cistern. When the liquid reaches the height of the opening, the water flows into the overflow 42 through said opening. The overflow 42 includes a one-way valve, also referred to as a non-return valve (not shown), to regulate fluid from entering the cistern and in particular to prevent fluid from entering the cistern through the overflow 42. Alternative arrangements are also possible in which a valve is not provided.

The cistern 8 further includes a conventional refill system 44 which is connected to a source of liquid (e.g. water), to refill the cistern 8 with liquid after the cistern contents are flushed into the bowl 10. The refill system 44 includes an inlet 46 for receiving liquid from the liquid source (e.g. a pipe) and a float valve 48 to stop refill once the liquid reaches an acceptable level W. Adapted seat with extraction system Referring to figures 6 to 10, a toilet seat 16 is fitted with an extraction system 4 having a suction system 20. An annulus of the toilet seat 16 extends along a longitudinal direction 50 and lateral direction 52, circumferentially around a central hole, which in an operative position is arranged over the toilet bowl 10. Along the longitudinal direction 50, the seat 16 has a front 56 and a back 58, which are respectively distal and proximal the cistern 8 when in the operative position.

Referring to figure 10 in particular, the seat has a cross-section 16 that includes a base with an underside 64 and an oppositely-facing upperside 66, which extends in the longitudinal and lateral plane. The base interconnects inner edge 68 and outer edge 70 portions that extend in the height direction 54 to define a cavity 72.

Referring to figures 6 and 8 in particular, the seat 16 includes a conduit system 74 of the extraction system 4. The conduit system 74 is provided in fluid communication with a region proximal the seat 16. As shown in Figures 6 and 8, the conduit system 74 is placed in fluid connection with the cavity 72.

In variant embodiments, which are not illustrated, the conduit system may be placed in fluid communication with a different region of the toilet, e.g. along an upperside of the toilet seat, e.g. around the interior edge of the upperside (see Figure 10).

Similarly to the cistern embodiment, the conduit system 74 is coupled to a suction system 20 to extract gas from an inlet in proximity with the toilet. The extracted gas is then directed into an SVP.

As shown in Figures 7 to 9, the conduit system 74 includes a first conduit 76A and a second conduit 76B. The first conduit 76A and second conduit 76B each include a respective inlet 78A, 78B proximal the toilet 6 and a respective outlet 80A, 80B leading to the suction system 20. By providing two conduits 76A and 76B, each having a single inlet 78A, 78B, gas is extracted from two regions proximal the inlets.

Each conduit 76A and 76B is implemented as a tubular hose or pipe, and is coupled to the seat 16 through a respective aperture 82A, 82B in a wall at the back 58 of the seat 16. Each conduit 76A and 76B is flexible in operative proximity to the respective apertures 82A and 82B, to permit movement of the seat 16 between an upward position (Figure 8) and a downward position (Figure 6). The conduits 76A and 76B may be formed of a plastic material such as PVC or a rubber.

In variant embodiments, which are not illustrated, the conduit system may include fewer or more conduits. For example, the conduit system could only include a single conduit having an inlet proximal the back wall, e.g. only the conduit 76A. Alternatively, the conduit system could include a single conduit such as a hose which extends around the toilet seat and which comprises one or more inlets in the form of one or more perforations, to permit gas flow into the conduit. The hose could extend nearly entirely around the seat and could be attached on both sides of the seat through the two apertures in the back wall. By using such an arrangement incorporating a number of inlets in the conduit, a plurality of gas inlets can be provided around a larger region of the toilet.

Referring again to Figures 6 to 10, a closing member 84 closes the cavity of the toilet seat 16. The closing member 84 is removably coupled to the seat 16, e.g. by a snap fit or mechanical fixtures such as bolts. The closing member 84 is a solid cover or plate which may be formed of plastic.

The closing member 84 includes a plurality of apertures or perforations 86 which are distributed around the closing member 84 and which act as inlets for gas flow into the cavity 72. In this manner, the closing member 84 forms a part of the conduit system 74 along with the first and second conduits 76A, 76B.

In the present embodiment, the apertures 86 are equispaced around the closing member 84. In variant embodiments, which are not illustrated, the apertures might not be equispaced, e.g. there may be a greater number of more closely spaced apertures near the back of the seat than at the front, to extract proportionally more gases from the back of the toilet bowl.

As shown in Figure 10, the apertures 86 are offset from a centre C of the cross-section 72 and closing member 84, toward an interior side 68 of the toilet seat 16. In this manner, during use, the apertures 86 are closer to the bowl 10 and therefore provide more targeted extraction than if the apertures 86 were nearer the exterior side 70.

In variant embodiments, which are not illustrated, the apertures may be provided nearer the exterior side. Such an arrangement may reduce the likelihood of liquid from the toilet entering the cavity, thereby making it easier to maintain a clean system.

In variant embodiments, which are not illustrated, the apertures may be arranged along the centre line such that they are not offset from the centre line. This may provide a balance between the above mentioned benefits. A combination of the above arrangements may also be used, to provide apertures at a variety of different offsets from the centre, and/or to provide an elongate aperture which extends in a varying horizontal manner to provide a varying offset along its length.

Referring to Figure 8, the underside 64 of the toilet seat 16 comprises stops 88 which vertically extend from the underside 64 of the seat and beyond the closing member 84. In other words, the closing member 84 is arranged such that its lower surface is between a lower edge of the stops 88 and the underside 64 of the toilet seat. In this manner, when the seat 16 is in a downward position, the stops 88 rest on a rim of the toilet bowl 10. This provides a larger air gap near the apertures 86 (i.e. in the height direction between the apertures and the stops) to promote gas flow therethrough and also prevents closing of the apertures 86 via abutment with the rim of the bowl.

Figure 8 includes four stops 88 which are equidistant around the perimeter of the seat 16. In variant embodiments, which are not illustrated, the stops may not be equidistant, and/or fewer stops may be used (e.g. a single stop).

In embodiments, wherein a conventional toilet seat is modified to include the conduit system, the stops 88 can be present even before retrofitting the toilet seat 16, and the closing member 84 is configured to accommodate said stops 88. In variant embodiments, which are not illustrated, one or more stops may be provided when retrofitting the seat.

In embodiments, the stops 88 may extend from and be provided on the closing member.

As shown in Figure 10, the closing member 84 is substantially flat and is parallel with the horizontal plane of the toilet seat 16. In variant embodiments, which are not illustrated, the closing member may have a differently shaped surface and/or may be angled. For example, it may be slanted to angle the apertures toward the inner periphery of the seat, such that when in use, the apertures are directed toward the toilet bowl.

Suction System Referring to Figures 11 and 12, a suction system 20 implements a motor powered fan. The suction system includes blades 90 powered by a motor 92 which is powered by a power supply.

The suction system 20 includes an enclosure between an inlet 94 and an outlet 96, within which the fan is located, through which gas may flow from the toilet 6 toward the SVP. The inlet 94 and outlet 96 may be rotatable relative to one another to provide a custom fit to an existing toilet system. The inlet 94 is coupled to the conduit system of the extraction system 4, and the outlet 96 is coupled to an existing pipe which leads to an SVP. The existing pipe is provided with an aperture such that the suction system 20 may be adapted onto the existing pipe.

The suction system 20 includes a one-way valve (not shown) to prevent gas flow from the outlet 96 toward the inlet 94 when the suction system is not activated. In variant embodiments, which are not illustrated, the one-way valve may be provided external to the suction system, e.g. in one of the conduits coupled thereto, or said valve may be omitted.

In Figure 1, the suction system 20 is positioned below the cistern 8 and the toilet seat 16 (not shown). In Figure 7, the suction system 20 is located below the cistern 8 but at approximately the same height as the toilet seat 16. In variant embodiments, which are not illustrated, the suction system 20 may be located elsewhere relative to the toilet 2, e.g. above the toilet.

The toilet system includes a control system having an input unit and a processor (not shown), which are operable to control the suction system 20. In variant embodiments, which are not illustrated, the control system may include a sensor and/or a timer to control the timing of when the suction system is activated. The timer may keep the suction system turned on for a set amount of time after use.

Retrofitted toilet systems may include only a modified cistern, only a modified toilet seat, or a combination thereof. The same suction system may be connected to the conduit system of a modified cistern 8 and to the conduit system of a modified toilet seat 16. Alternatively, the cistern and toilet seat may be coupled to separate suction systems, e.g. to exert different levels of suction through each conduit system.

Referring to figure 13, a toilet bowl 100 comprises an interior cavity 102 defined by interior walls 104 and a base 106. A waste outlet 107 at the base 106 of the interior cavity 102 of the blow 100 is for extraction of liquid in the interior cavity 102 to a soil vent pipe (not shown). A flush passageway 108 interconnects with a flush outlet 110 at a rim 112 of the bowl to transmit liquid flushed from a cistern (not shown in figure 13) into to the interior cavity 102.

An extraction system 114 comprises a conduit 116 arranged within the bowl 100, i.e. between the interior walls 104 and exterior walls 118 thereof. The conduit 116 includes an extraction inlet 120 in fluid communication with a region inside the interior cavity 106 of the bowl 100. The conduit 116 includes an extraction outlet 122 arranged through an aperture 124 in exterior wall 118 at a rear of the bowl 100.

A suction system 20 (as discussed in previous embodiments and as illustrated in figure 11, and which for brevity is not further discussed) is configured to connect in fluid communication with the extraction outlet 122 to extract gas through the conduit 116 from the region in fluid communication with the extraction inlet 120. In particular, the extraction outlet 122 may be shaped to receive an inlet 94 of the suction system 20, including by press fit, screw fit or other suitable connection system.

The conduit 116 of the extraction system 114 extends as a first portion as an annulus within the rim 112, and as a second portion through the rear of the bowl 100. The first and second portion are fluidically connected (although not illustrated in figure 13).

The extraction inlet 120 is implemented as a plurality of apertures 124, which are disposed circumferentially along the rim 112. In particular, the apertures 124 are arranged on an underside of the annulus of the rim 112 and are radially inward of the in respect of the flush outlet 110. In this way, liquid flushed from the flush outlet 110 is projected on to the internal wall 104 of the interior cavity 102 without passing over the extraction inlet 120.

In variant embodiments, which are not illustrated, the extraction inlet (and other related componentry such as the first portion of the conduit) may be alternatively arranged, e.g.: it is arranged radially outward of the flush outlet 110; it is arranged as a continuous slot rather than discrete apertures; it is arranged not on the rim, e.g. it is arranged below the rim; it is arranged on a side of the rim. The extraction outlet may be alternatively arranged, e.g. on a side of the bowl.

As used in this specification, any formulation used of the style "at least one of A, B or C", and the formulation "at least one of A, B and C" use a disjunctive "or" and a disjunctive "and" such that those formulations comprise any and all joint and several permutations of A, B, C, that is, A alone, B alone, C alone, A and B in any order, A and C in any order, B and C in any order and A, B, C in any order. There may be more or less than three features used in such formulations.

In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word 'comprising' does not exclude the presence of other elements or steps then those listed in a claim. Furthermore, the terms "a" or "an," as used herein, are defined as one or more than one. Also, the use of introductory phrases such as "at least one" and "one or more" in the claims should not be construed to imply that the introduction of another claim element by the indefinite articles "a" or "an" limits any particular claim containing such introduced claim element to inventions containing only one such element, even when the same claim includes the introductory phrases "one or more" or "at least one" and indefinite articles such as "a" or "an." The same holds true for the use of definite articles. Unless stated otherwise, terms such as "first" and "second" are used to arbitrarily distinguish between the elements such terms describe. Thus, these terms are not necessarily intended to indicate temporal or other prioritization of such elements. The mere fact that certain measures are recited in mutually different claims does not indicate that a combination of these measures cannot be used to advantage.

Unless otherwise explicitly stated as incompatible, or the physics or otherwise of the embodiments, example or claims prevent such a combination, the features of the foregoing embodiments and examples, and of the following claims may be integrated together in any suitable arrangement, especially ones where there is a beneficial effect in doing so. This is not limited to only any specified benefit, and instead may arise from an "ex post facto" benefit. This is to say that the combination of features is not limited by the described forms, particularly the form (e.g. numbering) of the example(s), embodiment(s), or dependency of the claim(s). Moreover, this also applies to the phrase "in one embodiment", "according to an embodiment" and the like, which are merely a stylistic form of wording and are not to be construed as limiting the following features to a separate embodiment to all other instances of the same or similar wording. This is to say, a reference to 'an', 'one' or 'some' embodiment(s) may be a reference to any one or more, and/or all embodiments, or combination(s) thereof, disclosed. Also, similarly, the reference to "the" embodiment may not be limited to the immediately preceding embodiment.

The foregoing description of one or more implementations provides illustration and description, but is not intended to be exhaustive or to limit the scope of the invention to the precise form disclosed. Modifications and variations are possible in light of the above teachings or may be acquired from practice of various implementations of the present disclosure.

LIST OF REFERENCES

2 Toilet system 4, 114 Extraction system 20 Suction system Blades 92 Motor Extraction conduit (cistern) 36 Connection conduit 32 Inlet 34 Outlet 74 Conduit system (toilet seat) 76A First conduit 78A Inlet 80A Outlet 76B Second conduit 78B Inlet BOB Outlet 84 Closing member 86 Apertures 116 Conduit (toilet bowl) 120 Extraction inlet 124 Aperture 122 Extraction outlet 124 Aperture 6 Toilet 8 Cistern 28 Conventional overflow system Inlet 32 Outlet 34 Aperture 42 Replacement overflow system 44 Refill system 46 Inlet 48 Float valve 10, 100 Bowl 112 Rim 102 Interior cavity 104 Interior walls 106 Base 107 Waste outlet 118 Exterior wall 108 Flush passageway Flush outlet 12 Passageway 14 Flushing system 22 Body 24 Flush valve 26 Flush control 16 Seat Longitudinal direction 56 Front 58 Back 82A, 82B Installation aperture(s) 52 Lateral direction First side 62 Second side 54 Height direction 64 Underside 72 Cavity 88 Stops 66 Upper side 68 Interior edge 70 Exterior edge 18 Lid

Claims

CLAIMS1 A toilet system comprising: a toilet having a cistern, a flushing system and a passageway, wherein the flushing system comprises a flush valve to regulate liquid in the cistern into the passageway; and an extraction system, wherein the extraction system comprises: a conduit arranged within the cistern having an inlet in fluid communication with the passageway and an outlet arranged through an aperture at a base of the cistern, wherein the conduit is sealed between said inlet and outlet to prevent fluid in the cistern entering the conduit, and a suction system configured to couple in fluid communication with the outlet to extract gas through the conduit from a region in fluid communication with the inlet.
2. The toilet system of claim 1, wherein the suction system and conduit are configured with the suction system to be located below the outlet of the conduit.
3 The toilet system of claim 1 or 2, wherein the cistern further comprises an overflow mechanism to regulate a height of the liquid in the cistern, the overflow mechanism to direct overflow liquid held by the cistern to external the cistern through an aperture in the cistern, wherein the aperture is arranged at the base of the cistern.
4 The toilet system of any preceding claim, wherein the cistern further comprises an overflow mechanism to regulate a height of the liquid in the cistern, the overflow mechanism to direct overflow liquid held by the cistern to external the cistern through an aperture in the cistern, wherein the aperture is separated from the aperture of the outlet of the conduit.
The toilet system of any preceding claim, wherein the flushing system comprises a dual flush system that regulates the liquid in the cistern with a first mode and second mode, wherein the first mode dispenses less liquid into the passageway than the second mode.
6 The toilet system of any preceding claim, comprising a control system having an input unit, wherein the control system is configured to operate the suction system based on a signal from the input unit.
7. The toilet system of claim 6, wherein the control system is configured to send a control signal to vary a suction level of the suction system based on the received signal.
8 A toilet seat and an extraction system, the extraction system having: a conduit system coupled to the toilet seat, the conduit system comprising one or more inlets in fluid communication with an underside of the toilet seat and an outlet; and a suction system configured to couple in fluid communication with the outlet to extract gas through the conduit system from a region in fluid communication with the inlet(s).
9 The toilet seat and the extraction system of claim 8, wherein the conduit system comprises a first conduit and a second conduit, wherein the first conduit and second conduit each comprise: an inlet in fluid communication with the underside of the toilet-and an outlet in fluid communication with the suction system.
10. The toilet seat and the extraction system of claim 9, wherein the respective inlets of the first and second conduits are located at opposing sides of the underside of the toilet seat.
11. The toilet seat and the extraction system of any one of claims 8 to 10, wherein the conduit system includes an underside of the toilet seat defining a circumferential cavity extending along the seat, which is closed by a closing member, the closing member comprising one or more apertures for extraction of gas into the cavity.
12. The toilet seat and the extraction system of claim 11, wherein the closing member is removably coupled to the underside of the toilet seat.
13. The toilet seat and the extraction system of claim 11 or 12, wherein the one or more apertures are circumferentially distributed around the underside of the toilet seat.
14. The toilet seat and the extraction system of any one of claims 11 to 13, wherein the apertures are arranged offset from a centre line along which the circumferential cavity extends, towards an interior side of the toilet seat.
The toilet seat and the extraction system of any one of claims 11 to 14, wherein the toilet seat includes one or more stops that extend from the underside to abut a rim of the bowl, wherein the one or more stops extend beyond the apertures.
16. The toilet seat and the extraction system of any one of claims 11 to 15, wherein the toilet seat further comprises one or more installation apertures to receive the conduit and thereby couple the conduit to the toilet seat.
17. The toilet seat and the extraction system of claim 16, wherein the conduit is flexible in operative proximity to the installation apertures to accommodate movement of the seat between an upward and downward position.
18. The toilet system of any one of claims 1 to 7; comprising the toilet seat and extraction system of any one of claims 8 to 17.
19. A method of retrofitting an extraction system to a cistern of a toilet, the cistern comprising an overflow system having an inlet for receiving overflow fluid in the cistern and an outlet for transmission of the overflow fluid into a passageway, the passageway to receive liquid dispensed from a flushing system of the cistern, the method comprising: forming an aperture as an outlet in the cistern; fluidically connecting with a conduit the overflow system to an outlet formed by the aperture; and connecting a suction system in fluid communication with the conduit to extract gas from the passageway.
20. The method of claim 19, the method comprising installing a replacement overflow system.
21. The method of claim 20, comprising forming an aperture as an overflow outlet in the base of the cistern, and fluidically connecting the replacement overflow system to the overflow outlet.
22. The method of any one of claims 19 to 21, comprising connecting the suction system and/or replacement overflow system to a soil vent pipe (SVP).
23. A method of fitting an extraction system to a toilet seat, the method comprising: arranging a conduit to have an inlet in fluid communication with an underside of a toilet seat; connecting a suction system in fluid communication with the conduit to extract gas through the conduit from a region in fluid communication with the inlet.
24. The method of claim 23, wherein the method comprises forming an aperture in the toilet seat and inserting the conduit through the aperture.
25. The method of claim 23 or 24, where the method comprises removably coupling a closing member to the toilet seat, wherein the closing member closes a cavity extending along an underside of the toilet seat, the closing member comprising one or more apertures for extracting gas into the cavity.
26. A toilet bowl and an extraction system, the bowl comprising: an outlet at a base for extraction of liquid in the bowl to a soil vent pipe, and; a flush passageway that interconnects with a flush outlet at a rim of the bowl to transmit liquid flushed from a cistern into the bowl, the extraction system comprising: a conduit arranged within the bowl having an extraction inlet in fluid communication with a region inside of the bowl and an extraction outlet arranged through an aperture in the bowl, and; a suction system configured to connect in fluid communication with the extraction outlet to extract gas through the conduit from the region in fluid communication with the extraction inlet.
27. The toilet bowl and extraction system of claim 26, wherein the extraction inlet and the flush outlet of the rim are arranged with liquid transmitted from the flush outlet to enter the interior of the bowl without entering the extraction inlet.
28. The toilet bowl and extraction system of any preceding claim, wherein the extraction inlet is arranged on the rim.
29. The toilet bowl and extraction system of claim 28, wherein the extraction inlet is arranged radially inward of the flush outlet.
30. The toilet bowl and extraction system of any preceding claim, wherein the extraction inlet extends around an interior wall of the bowl.
31. The toilet bowl and extraction system of claim 29, where said extraction inlet is circumferentially distributed around the interior wall of the bowl.
32. The toilet bowl and extraction system of any preceding claim wherein the extraction inlet is arranged as a plurality of apertures through the interior wall of the bowl.