A water-closet ("w.c.", "toilet" or "loo") comprises a bowl made of glassed porcelain or the like having a pan formed therein for collecting fæces, urine and like human exudates. The top of the pan is connected to the end of a water pipe for flushing the pan and carrying away the substances deposited therein. A drain pipe leads off from the bottom of the pan and through a syphon or hydraulic trap down to an outlet opening at the bottom of the bowl such that, when the water-closet is installed, the outlet opening faces down into the inlet hole of a sewage drain-pipe in the floor of the bathroom.

The present invention concerns a gasket for sealing the connection between the drain-pipe of the water-closet and the sewage drain-pipe in the floor for preventing water and the bodily wastes from leaking out and soiling the floor, thereby assisting in bathroom upkeep and hygene. Of course, the gasket may find other applications in similar fixtures, such as bidets and urinals, having drainage means passing through the floor or like building surface.

To install a water-closet on the bathroom floor is not a difficult task. The bowl is placed directly on the floor to which it is anchored by a set of bolts, such that the drain-pipe is located right on top of the sewer pipe inlet at floor level. Sealing is carried out to prevent soiling of the floor around the water-closet by means of a rubber gasket the top end of which is affixed to the drain duct and its bottom end rests resiliently against the floor.

This bottom end of a conventional gasket may include three concentric rings the free circumferential edges of which bear against the floor to prevent passage of fluid and wastes outwards.

The conventional sealing means are prone to irregularities on the floor surface, which one generally tries to overcome by adding some sealer material to make up for the uneveness of the floor. However, the material eventually loses its sealing properties with time as the material ages and because of micromovements which happen in the course of normal use of the water-closet, among other reasons.

GB-A-1567326 and GB-A-2012902 both describe connectors for connecting the outlet of a water-closet to a sewage pipe.

EP-A-1197608, which was published after the priority date of the present invention, discloses a gasket with an outer gasket part for sealing the supporting edge of a water-closet base against the floor and an inner gasket part for isolating the inside of the toilet from the surrounding environment as defined in claim 1. Nevertheless, EP-A-1197608 does not disclose spaced gasket parts that are connected to each other by circumferentially spaced spokes.

An object of the invention is to provide a gasket for sealing the outlet of water-closet so as to assure a leak-free connection, independently of the surface condition of the floor, to avoid sewage odours and leakage of liquids from the drain duct.

Another object is to provide a gasket which makes sanitary fixtures easy, quicker and cheaper to install, adaptable furthermore to different sewer piping sizes.

An accessory object of the invention is to provide a full gasket for improving the bearing and securement of the fixture of the floor and including the sealer gasket of the water-closet drain for assuring good sealing of the bearing, blocking water coming from washing down the bathroom floor from leaking into the compartment formed under the stand of the bowl and stopping dirt from getting inside and into the gap between the fixture and the floor.

In one aspect the invention provides a gasket for sealing the water-closet drain comprising a tube the top of which is affixed to the drain-pipe of the water-closet and which, according to the invention, includes a lower span fitting into the sewage pipe and provided with rings or like sealing means on the outer surface thereof for forming a fluid-tight seal against the inner surface of the sewage-pipe. In a preferred embodiment, the gasket is a single piece of moulded plastics material, such as polyvinyl, rubber or the like, integrating gasket sealing rings consisting of several rings longitudinally separated along the part of the single piece forming the tube of the gasket. In alternative embodiments, tubular bellows may be used, for instance, in place of the rings.

As an accessory, the one-piece gasket may further include the conventional concentric rings as well as inner sealer means about the top end of the gasket tube for fitting onto and forming a tight seal about the hole of the drain-pipe of the water-closet.

In a further embodiment, the drainage gasket is integrated into a common one-piece full gasket which includes an oval gasket portion through which the base of the water-closet stand rests on the floor.

• Figure 1 is a schematic perspective view of the drain piping of a water-closet which is shown transparented for purposes of illustration wherein the present invention finds application.
• Figure 2 is a perspective view of a one-piece full gasket for a water-closet including the drainage sealer gasket according to a preferred embodiment of the present invention.
• Figure 3 is a front-back elevation view of the gasket of figure 2.
• Figure 4 is a cross-section view of the gasket of figure 2.
• Figure 5 is a schematic perspective underside view of the water-closet stand of figure 1 showing the installation of the gasket of figures 2 to 4.
• Figures 6 to 12 are cross-sections analogous to that of figure 4 illustrating different drainage sealer gaskets according to respective alternative embodiments of the present invention.
• Figure 13 is a cross-section view of an inner sealer gasket part according to a more preferred embodiment of the invention.

A field of application of the gasket of the present invention for sealing the drain-outlet of water-closets 21 is disclosed, notwithstanding persons skilled in the art may adapt it to other uses. As illustrated in figure 1, the water-closet 21 comprises a bowl 23 of ceramic glass in the form of a pan 25 having an inside for receiving human wastes or exudates. A duct 27 allows water to be flushed into the pan 25 for evacuating the latter through a drain-duct 29. This drain-duct 29 conventionally includes a syphon 31 for trapping water in the pan 25 and sealing malodours in a sewage pipe 37 from emanating from the pan 25 to the bathroom.

Refering specifically to the application of the present invention, the sewage-pipe 37 has a hole at floor level 33 over which the water-closet 25 is installed such that it may be engaged by the outlet hole 33 of the W.C. drain-duct 29, using one of the gaskets described in the following exemplary embodiments to prevent soiled fluid from leaking through the connection and soiling the surface of the floor 35.

Figures 2, 3 and 4 illustrate in detail a preferred embodiment of a full gasket for water-closets 21, comprising a gasket outer portion 39 having an ovaloid shape like the perimeter of the base of the stand 41 (figure 5), on which the bowl 23 rests or bears on the floor 35 (figure 1), an inner portion 43 forming the drainage sealer gasket per se of the present invention and a pair of spokes 45 bridging both gasket portions 39 and 43 to form a single piece of moulded plastics material, such as polyvinyl, rubber or like material providing slightly resilient properties, with the aggregation of antimicrobic agents. The external gasket 39 is moulded with a small step 47 on its upper face so as to fit into the base of the stand 41. The spokes 45 are pierced by a pair of orifices 49 through which bolts for securing the bowl 23 to the floor 35 may be passed.

The water-closet drainage sealer gasket 43 comprises a tube 51 of the same slightly resilient moulded plastics material which joins the drain 33 hole at the bottom of the water-closet 21 to the sewage-pipe 37. Specifically, the upper end of the tube 51 is affixed to the drain-duct 29 whereas at its bottom end, the tube 51 the tube extends, according to the invention, into a span 53 which plugs into the sewage-pipe 37, thereby providing the necessary connection in the water-closet 21 installation.

To improve and assure the sealability of this connection, sealer rings made of the same moulded plastics material, e.g. four longitudinally-spaced flat rings 55, are integrated onto the outer wall surface of the bottom tubular span 53 according to the invention. The seal-tight connection is achieved by the resilient pressure of the rings 55 against the inner wall surface of the pipe 37.

Carrying out the sanitary connection is easy to learn and do. The upper end of the tube 51 is fitted onto the end of the hole 33 at the end of the water-closet pipe 29. The outer gasket part 39 is fitted onto the perimeter of the base of the stand 41 before bringing the bowl 23 to rest on the floor 35 and effortlessly shoving the tubular ringed span 53 down sufficiently inside the pipe 37. Thereby securing bolts are installed through the orificies 49 in the spokes 45. Figure 5 illustrates the final installation of the water-closet bowl 23 with the gasket.

Considering figures 2, 3 and 4 again, the top end of the tube 51 may be connected in different ways to the drain duct 29. The present invention suggests doing it by plugging the hole 33 of the duct 29 inside the upper end of the tube 51, the inner wall surface of which has additional seal-rings in the form of four flat rings 57 longitudinally distributed along the tube 51 and which work in the same way as the main rings 55.

Figure 6 illustrates a variant to the main seal-rings, consisting in forming the bottom span 53 as a bellows 59. The bellows 59 have the same purpose of the sealer means 53 of the preceding embodiment in that, when they are forced into the pipe 37, they exert an expansion pressure against the inner wall surface of the sewage pipe 37. In the same way, the additional sealer means may be formed by a bellows 61 in the upper end of the tube arranged to exert resilient pressure about the hold 33 of the drain duct 29.

Figures 7 and 8 illustrate other alternative embodiments which are foreseen although believed to be not as preferable as the preceding embodiments, consisting in different combinations of the seal-rings 55 and 57 of figure 5 alternated with the bellows 59 and 61 of figure 7.

The cross-sections shown in figures 9 and 10 illustrate further alternative embodiments of the drain gasket of the invention wherein an upstanding ring 63 concentric relative to the tube 51 is integrated into the one-piece full gasket of the invention. The upstanding ring 63 has at the bottom thereof a free circumferential edge 65 which bears on the floor 35, as in some conventional gaskets. The cross-sections shown in figures 11 and 12 are respectively similar to the embodiments of figures 9 and 10 except that three concentric rings 63A, 63B and 63C are integrated into the one-piece gasket to seal against the floor surface 35.

Figure 13 is a cross-section of a more preferred embodiment of the drain sealer gasket part 49 of the present invention which, as in the other embodiments, may be integrated into a single piece with the stand gasket part 39. The upper portion of the gasket 49 depicted in figure 13 is an integrated disk 67 featuring a generally flat face 69 except for an upstanding ring-shaped ridge 71 designed to fit around the outer edge 33 of the bowl drain-duct 29. Installation is simplified in this case since there is no need to first fit the gasket 43 about the drain outlet pipe 29.

The lower portion of the gasket 43 has three flat rings 55. The gasket 43 is installed and works essentially in the same way as the the other embodiments, sealing the drain connection once the bowl 23 is placed thereon and secured to the floor 35.

Of course, changes, variations and aggregations may be made to the multiple embodiments described above, without departing from the scope. The same has been described by way of preferred embodiments specifically for water-closets, however those skilled in the art may suit it to other applications without departing from the purview of the invention. For example, the inner gasket 43 may be independent or devoid of the outer gasket 39 or the four rings 57 or the bellows 61 near the upper end of the tube 51 be increased, reduced or omitted for practical reasons, if any, among other variations.