GB2211520A

GB2211520A - Localised lavatory extraction system

Info

Publication number: GB2211520A
Application number: GB8725306A
Authority: GB
Inventors: R Rajinder Singh Aujla
Original assignee: AUJLA DR RAJINDER SINGH
Current assignee: AUJLA DR RAJINDER SINGH
Priority date: 1987-10-29
Filing date: 1987-10-29
Publication date: 1989-07-05
Also published as: GB8725306D0

Abstract

A secondary cistern seat 2 with an air cavity attaches to the bottom of the conventional cistern seat 3. The air cavity opens to inner and outer orifices and to the outlet connected to the extraction fan 4 to provide suction. A rubber ring is fixed to the bottom of the seat to provide an airtight seal between the ceramic cistern and the secondary seat for effective extraction from the cistern. The system then provides a means of removing the bad odour from the cistern as soon as it is released. The system may be operated via a manual switch or automatically by a micro-switch. <IMAGE>

Description

LOCALISED LAVATORY EXTRACTION SYSTEM This invention relates to a localised lavatory extraction system for the toilet cistern.

Foul odour in lavatories is well known to everyone.

Various methods exist which are employed in an attempt to eliminate the smell of human faeces. A common means of achieving this is to use extraction fans, fitted to the walls or ceilings of lavatories to expel the stagnant air.

The extraction fan works by removing the warm stagnant air as it rises to the ceiling. Cold fresh air then enters the lavatory through the window or crevices. Then there are air freshners which work by diluting the stagnant air with pleasant smell.

These techniques, together with others of similar design, are quite ineffective as is apparent to everyone. The extraction fans fitted to the walls and ceilings do not fully achieve the required result since the time taken for the bad odour to reach the fan is prolonged. This is because the air molecules travel in a random or brown ivan motion due to the collisions between the odour molecules and the air molecules. This process allows the smell to spread into the whole of the lavatory enclosure. Of course, since the lavatory may be used repeatedly, the air is never free from the unpleasant smell. The air freshners work by diluting the bad odour molecules with those of pleasant nature. However, the process is dependent on the intensity of the bad smell.Thus the time required to achieve the dilution down to a level which is undetectable by human nasal receptors can be extremely long.

According to the present invention there is provided an effective localised extraction system which removes the foul air as soon as it is released -into the cistern, and thus avoids its propagation into the outside air. The system includes a secondary seat with air cavities which fits beneath the conventional cistern seat. The secondary seat feeds into an extraction fan by means of a pipe. The outlet from the extraction fan is either fed into the main sewage pipe or out through the wall.

A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawings in which: Figure 1 shows in perspective, the localised extraction system in position with the secondary seat attached to the cistern seat.

Figure 2 illustrates the detailed construction of the secondary seat.

Referring to the drawing in figure 1, the localised extraction system comprises a secondary seat 2 and an extraction fan 4 housed in an insulated box. The tuo are inter-connected by means of a pipe 5, the one end of which is firmly secured onto the extraction fan while the other end is connected to the secondary seat through a movable joint (not shown) so that the secondary seat may be moved up or down without moving the pipe or disturbing the pipesecondary seat extraction flow. The secondary seat 2 is secured to the cistern seat 3 by, for example a bolt or similar means (not shown). The two joined seats 2 and 3 can then rest on the cistern as usual. The exhaust of the extraction fan 4 is connected to the atmosphere through a pipe 6. The novel feature of this extraction system- is the secondary seat 2 which is shown in detail in figure 2.

The seat has an air cavity 7 which opens into various orifices 9 and 10 and an exhaust outlet 5. The inner orifices 9 provide the suction required to achieve the extraction of bad odour in the cistern as soon as it is released. The fewer outer orifices 10 ensures that the subject sitting on the cistern does not get stuck to the seat since an airtight seal may be made between the subjects posterior and the seat. A rubber ring 8 at the bottom of the secondary seat provides the necessary airtight seal between the ceramic cistern and the secondary seat for the system to operate effectively. The extraction fan may be switched manually by external switch or by a micro-switch (not shown) mounted at the bottom of the secondary seat.

Claims

1. The localised lavatory extraction system comprising a novel secondary seat with an air cavity linked by pipes to the extraction fan for exhaust output. The seat being adapted to fit any cistern seat size and shape available commercially. The localised extraction system wherein inner and outer orifices are provided to enable suction into the air cavity of the secondary seat. The localised extraction system wherein a rubber ring is provided at the bottom of the secondary seat to ensure airtight seal between ceramic cistern and the secondary seat.

2. The localised extraction system as claimed in claim 1 wherein a pipe is provided to connect the secondary seat cavity to the extraction fan.

3. The localised extraction system sequentially described herein with reference to figures 1 and 2 of the accompanying drawings.

4. The localised extraction system as claimed in claim 3 and other possible modifications of the system involving localised air cavity as means of extraction, such as the ceramic cistern itself with built-in air cavity, where the extraction principle is the same as described herein.