Lavatory pan seat

Abstract: A lavatory pan seat (10) generally of conventional shape and adapted to be mounted to the pan at the back of the rim by a hinging means (16), the seat having air inlet apertures (14) at its inner periphery communicating with an air channel within the seat which also communicates with an air extraction passage connected to a hose (20) leading to an extractor fan (22), the hinging means comprising a hollow centre piece (18) fixed to the pan and two hollow cheeks pivotally mounted to the centre piece, whereby the air extraction passage extends from the internal air channel to the fan hose (20) through said cheeks and centre piece (18).

Description: This invention relates to a lavatory pan seat. The rooms in which lavatories are housed can be rendered unpleasantly odorous after use of the lavatory, and partly for this reason these rooms are sometimes equipped with extractor fans to communicate the room atmosphere with the atmosphere outside the building. It has also been proposed to provide the lavatory with an air extraction means. In these known proposals, the lavatory seat has been provided with an internal air channel leading from air inlets at the inner periphery of the seat to an air extraction outlet at the outer periphery of the seat, the air extraction outlet communicating with an air outlet tube or pipe through which air is drawn by a fixedly mounted fan into a stench pipe or the atmosphere outside the building. Because the seat is hinged to the lavatory pan, various difficulties arise, including that of providing communication between the internal air channel of the hinged seat and the fixed fan (or associated fixed passageway in which the fan is mounted). Commonly, a flexible hose is employed to connect between the air extraction outlet of the hinged seat and the fixed fan structure. This flexible hose tends to be conspicuous, and it can affect the free hinging of the seat. U.S. Patent Specification No. 4 071 915 discloses a lavatory pan seat, cover and hinging means therefore which constitutes the closest prior art, in which an air channel within the seat, having an underside aperture to the interior of the pan, communicates with an air exhaust passage in a hollow hinging means having end caps one of which is integrally formed with an air escape pipe communicating with the air exhaust passage in the hinging means. The seat has ears which pivotally connect to a centre piece on opposite sides thereof, but the cover has an integral sleeve which turns about the centre piece. U.S. Patent No. 4 175 293, instead of having an air channel in the seat, has a hollow hinging means with a centre piece carrying a hood fixing downwardly into the pan interior. Air passes from the hood to the interior of the hinging means and thence to an air escape pipe at one side of the back of the pan. The present invention has for a principal aim to provide a seat and hinging means with an air extraction facility which is less conspicuous by virtue of a construction which resembles that of a conventional toilet seat. According to the invention, there is provided a lavatory pan seat and seat cover having a shape generally conforming to the shape of the rim of a conventional lavatory pan and hinging means with which the seat and cover can be hinged to said pan at the back of the rim, wherein the seat has at least one air inlet aperture in its wall adjacent its inside periphery, communicating with a passage for air extraction provided in the hinging means, wherein said hinging means comprises a hollow centre piece adapted to be fixed to the pan and arranged between two cheeks on the seat, one on each side of the centre piece in abutment therewith and having inner side faces which are pivotally mounted on the side faces of the centre piece to turn relatively to said centre piece and two cheeks on the cover, one on each outer side of the two seat cheeks and also pivotally mounted to turn relatively to the centre piece, at least one of said seat cheeks being hollow and the air extraction passage passing through at least said one hollow seat cheek into the centre piece, the centre piece having at its back an air extraction opening adapted for connection to an air exhaust hose and wherein said centre piece, seat cheeks and cover cheeks have part-cylindrical external profiles which axially align when the seat and cover are mounted to the pan. In accordance with the invention, therefore, the hinging means employed for the seat is formed hollow to enable air extraction via said hinging means. As the centre piece of the hinging means is fixed, no problem arises in connecting the fixed fan structure to it, and a relatively non-flexible and less conspicuous connecting hose or the like can be employed. Further features and advantages of the lavatory seat in accordance with the invention will be apparent from the following description of an embodiment, making reference to the accompanying drawings, in which:- Figure 1 is a pictorial view of a lavatory pan equipped with a pan seat in accordance with the invention; Figure 2 is a plan view of the seat, the seat cover being cut away; Figures 3 and 4 are cross-sectional views through the hinging means, in horizontal and vertical planes respectively; Figure 5 shows the seat in underplan; Figure 6 shows the seat in side elevation; Figure 7 is a vertical cross-section through the seat, when inverted, on the front to back centre line thereof; Figure 8 is an underplan view of the lower part of the seat; Figure 9 shows the lower part of the seat in side elevation; Figure 10 shows a modified seat hinging arrangement, partly in plan and partly in horizontal cross-section; Figure 11 is a vertical cross-section on the line X-X of Figure 10; Figure 12 is a cross-section corresponding to that of Figure 11, but with the seat raised; Figure 13 is a vertical cross-section on the line Y-Y of Figure 10; Figure 14 is a cross-section corresponding to that of Figure 13, but showing the manner of assembly of the seat and hinging means; and Figure 15 is a cross-section corresponding to that of Figure 13, but with the seat raised. Referring to Figures 1 and 2, the illustrated lavatory is provided with a pan seat 10 in accordance with the invention. Reference 12 denotes a seat cover. The seat has a series of air inlet openings 14 around its inside periphery, which via a not visible internal air channel communicate with a hollow hinging means 16. A fixed centre piece 18 of the hollow hinging means connects with an air outlet pipe 20 leading to a housing 22 containing an extractor fan (not shown), whereby air from inside the pan is drawn out to a stench pipe or to the atmosphere outside the building containing the room in which the lavatory is housed. In Figure 1, the arrows indicate the air flow which takes place when the fan is operative. The construction of the hollow hinging means is shown in Figures 3 and 4. This includes a base plate 24 with which the centre piece 18 is integrally formed, the base plate fixing to the rear of the pan in a conventional manner by means of nuts and bolts 26. Two hollow cheeks 28 on the seat at the rear thereof, one on each side of the centre piece 18, are pivotally mounted to turn relatively to the centre piece in order to provide for hinging of the seat. Pivotal mounting is by means of hollow cylindrical inserts 30 pushed into apertures in the wall of the centre piece 18 on opposite sides thereof. O-ring seals 32 are located between the cheeks and the inserts. Outwardly of the cheeks 28 of the seat, the cover 12 is pivotally mounted by means of cover cheeks 34 and pivot pins 36, and the hinging means also includes end pieces 38 held in place in a conventional manner by the heads of the fixing bolts 26. Separately formed bearing elements 40 constitute part of the cheeks of the seat and are shaped to provide supplementary pivotal bearings, on the ends of the pivot pins 34, on the sides of the seat cheeks 28 adjacent the cover cheeks 34. The separate bearing elements 40 are necessary to enable insertion of the inserts 30 during assembly, first of the seat and then of the cover, to the pan during installation. The centre piece 18 includes a short outlet connection pipe 42 which connects to the air outlet pipe 20 shown in Figures 1 and 2. In Figure 3, the internal air channel in the seat is referenced 44. As indicated by the dashed line, air flow from this channel when the fan is operative is via the hollow cheeks of the seat and through the hollow inserts 30 into the outlet connection pipe 42 of the centre piece. Referring to Figures 5 to 8, it can be seen that the pan seat comprises an upper part 46 and a lower part 48 assembled therewith in order to form the internal air channel 44 between them. Both parts have a shape generally conforming to the shape of the rim of a conventional lavatory pan, but the lower part has a perimeter incomplete at the front, and thus assumes a shape similar to that of a horseshoe (see Figure 8 for example). The hollow cheeks 18 of the seat which form part of the hinging means are integral with the upper part 46. The interior of said hollow cheeks communicates with the internal air channel 44. The lower part 48 is formed on its upperside (see Figure 8) with an air flow groove 50 extending around the length of the part and terminating just before the two ends of the part. Formed through the wall of the part 48, at the inside periphery thereof, are the air inlet apertures 14, the entrances to which face both generally downwardly and inwardly. The apertures 14 open into the air flow groove 50. The lower part 48 is provided on its underside with a sealing strip groove extending around the length of the part whereby a sealing strip 60, visible only in Figure 9, is fitted to the groove to cover the heads of screws 52 extending through screw holes provided to enable the lower and upper parts of the seat to be fixed together. A hole is also provided at the underside of the part 48, right through to the groove 50, for accommodating a microswitch 54. The microswitch will be operated by pressure on and compression of the sealing strip at the point where the microswitch is located. A connecting lead 56 to the microswitch extends around the groove 50 to emerge through the air extraction passage through the hinging means. The upper part 46 of the seat, as shown in Figure 5, has a complete perimeter, and is formed around the major part of its length, on its underside, with a groove matching the groove 50 in the lower part 48. As previously stated, the hollow cheeks 18 of the hinging means are also integral with this upper part 46, with the interior thereof communicating with the internal air channel defined by the matching grooves in the upper and lower parts. When in use the lavatory is used by a person sitting on the seat, the microswitch will trigger a relay timer, setting the fan into operation for the duration of closure of the microswitch and a preselected period thereafter. As the space within the pan is substantially closed, although able to draw air in through the gap created by the incomplete front of the lower part of the seat, any odours produced in the space will be directly extracted. The above-described seat may be machined from wood, or may be injection moulded of suitable plastics material such as UPVC. However, many modifications of the above-described arrangement are possible within the scope of the invention. For example, it may be practicable to form the plastics seat in one part, instead of upper and lower parts, by rotation moulding. When the seat is made of wood, the hinging means may be of metal, such as aluminium, and may incorporate nylon bearings. The extraction fan is preferably operated from the mains electricity supply, but could be powered from batteries, preferably rechargeable batteries. Moreover this fan, instead of extracting air to the exterior, may act to recirculate air through a suitable filter, such as a charcoal filter. Again, in practice, the strip for sealing the seat against the rim of the pan is not essential and, when it is provided, it may not cover the screws fixing the upper and lower parts of the seat together. Rather, said securing screws may be formed to be readily releasable, for example being replaced by quick-release bayonet-type fasteners, so that the lower part of the seat can be removed (when the seat is raised) to enable the interior air flow channel to be cleaned. It is also possible, in this connection, to locate the fan-controlling switch elsewhere, preferably towards the back of the seat, so that wiring through the interior air flow channel is minimised or avoided. An arrangement in which the switch is located in the hinging means is described later. Moreover, while a series of air inlet apertures around the inside periphery of the seat are preferred, it may sometimes be sufficient, for example if a stronger extractor fan is employed, to provide a single, larger air inlet aperture at the back of the seat, communicating directly with the air extraction passage through the hinging means. In this case the air flow channel inside the seat is not required, and the main portion of the seat can be of a solid construction, thus facilitating its production in one piece. The hinging means may also be arranged in a variety of ways, and one alternative arrangement will now be described by way of example with reference to Figures 10 to 15. In this construction, a base plate 61 fixing by screws to the lavatory pan in a conventional manner carries a hollow centre piece 62 which at the back has an aperture in which is received an adaptor plate 64 formed with a stub pipe 66 to which attaches the hose leading to the extractor fan. The provision of such an adaptor plate 64 enables the use of different sizes and shapes of tubing or piping leading to the fan. The seat 67 is again formed at the back with two hollow cheeks 68 for securing in hinging relationship to the centre piece 62. For this purpose, as shown in Figures 13, 14 and 15, the side faces of the centre piece 62 and the inner side faces of the cheeks 68 are formed with shaped cross sections 70 and 72, respectively, which enable the seat to be assembled into the centre piece from the back, as shown in Figure 14, the cross section of the centre piece being open at the back for this purpose, as indicated at 74. This assembly takes place at the manufacturing stage, as space is not available to assemble the seat into the centre piece in this way once the centre piece is fixed to the pan. Thus, although as shown in Figures 13 and 15 the seat is able freely to turn between lowered and raised positions, the bearings formed by the cooperating cross sections 70 and 72 eliminate any looseness in the seat mounting. Moreover, after assembling the seat to the centre piece in the above-described manner, closure members 76 are fixed into position behind the rear ends of the cheeks 68 of the seat by securing screws 78. The purpose of these closure members 76 is shown in Figures 11 and 12. First, the hollow cheeks 68 of the seat are each formed with a passage 80 communicating with the interior of said cheeks, and thus with the air flow channel within the body of the seat 67. Additionally, the wall of the cheek 68 defining one side of this passage 80 is formed as a projecting lip 82. Second, each closure member 76 is shaped with an abutment 84, faced with a sealing strip 86, against which the lip 82 abuts when the seat is in its lowered position (Figure 11), thus closing the end of the passage 80, which otherwise would enable escape of air when the fan is operative. However, when the seat is raised, as shown in Figure 12, the passage 80 is open into a channel 88 formed in the base plate 61 of the hinging means, which channel leads back towards the interior of the pan. Thus, when the seat is raised, any liquid present in the air flow channel within the body of the seat 67 is able to drain through the interiors of the cheeks 68 back into the pan. Moreover, as shown in Figure 11, the abutments 84 of one of the closure members 76 may incorporate a pressure switch 90 for operating the extractor fan, this switch being operated when the seat 67 is lowered and pressure is applied thereto to compress the sealing strip 86. Reverting to Figure 10, outside the cheeks 68 on the seat 67, the base plate 61 of the hinging means also carries upstands 92 (conveniently used to receive in adjustment channels 94 the heads of the screws 96 which fix the entire assembly to the pan) which incorporate on their outer side faces pivots 98 on which are mounted to turn two spaced lugs 100 projecting from the back of a lid or cover 102 for the lavatory pan. Figures 10 to 15 have been used to describe a variety of features any one or more of which may or may not be incorporated in a particular design of seat. Thus, while the manner of assembly of the seat and the hinging means in Figures 1 to 7 differs from that of Figures 10 to 15, it is readily possible to modify the first described hinging means to incorporate either or both of the liquid escape passage and the pressure switch for operating the fan, if desired.

Claims: A lavatory pan seat and seat cover having a shape generally conforming to the shape of the rim of a conventional lavatory pan and hinging means with which the seat and cover can be hinged to said pan at the back of the rim, wherein the seat (10, 67)has at least one air inlet aperture (14) in its wall adjacent its inside periphery, communicating with a passage for air extraction provided in the hinging means, characterised in that said hinging means comprises a hollow centre piece (18, 62) adapted to be fixed to the pan, and arranged between two cheeks (28, 68) on the seat (10, 67), one on each side of the centre piece (18, 62) in abutment therewith and having inner side faces which are pivotally mounted on the side faces of the centre piece (18, 62) to turn relatively to said centre piece (18, 62), and two cheeks (34, 100) on the cover (12, 102), one on each outer side of the two seat cheeks (28, 68) and also pivotally mounted to turn relatively to the centre piece (18, 62), at least one of said seat cheeks (28, 68) being hollow and the air extraction passage passing through at least said one hollow seat cheek (28, 68) into the centre piece (18, 62), the centre piece (18, 62) having at its back an air extraction opening (42, 66) adapted for connection to an air exhaust hose (20) and in that said centre piece (18, 62), seat cheeks (28, 68) and cover cheeks (34, 100) have part-cylindrical external profiles which axially align when the seat (10, 67) and cover (12, 102) are mounted to the pan. A pan seat according to claim 1, characterised in that the seat has a plurality of air inlet apertures (14) in its wall adjacent its inside periphery, and an air flow channel (44) within the interior of said seat extending around at least part of its periphery, the air inlet apertures and the air extraction passage communicating with said channel. A pan seat according to claim 2, characterised in that the centre piece interior communicates with the interiors of both hollow cheeks (28) on the seat and said cheek interiors communicate at the front of said cheeks with the air flow channel (44) in the seat (10). A pan seat according to claim 3, characterised by being formed in generally similarly shaped upper and lower parts (46, 48) which define the air flow channel (44) between them, the hollow cheeks being integrally formed with the upper part with their interiors communicating with said air flow channel. A pan seat according to claim 4, characterised in that the upper and lower parts (46, 48) are releasably secured together. A pan seat according to any of claims 1 to 5, characterised in that the outer side faces of the centre piece (18) and the respective inner side faces of the seat cheeks (28) are formed as or carry parts (30) for cooperation as bearings enabling hinging of the seat relative to the centre piece, the bearing parts associated with said at least one hollow cheek being annularly formed to enable the air extraction passage to pass through them. A pan seat according to claim 2 or any claim appendant thereto, characterised in that the hinging means incorporates a liquid escape passage (80) communicating with the air flow channel when the seat is raised and closed to said air flow channel when the seat is lowered. A pan seat according to any of claims 1 to 7, characterised by the combination with an extractor fan (22) communicating by means of the hose (20) with the air extraction passage. A pan seat according to claim 8, characterised in that the hinging means incorporates a switching device (54) for switching on the fan when the seat is lowered and pressure applied thereto.

Inventors: CASALE ENZO, CASALE, ENZO
Applicants: CASALE ENZO, CASALE, ENZO
Application year: 1991
Main classification: E03D9
IPC codes: A47K13, E03D9