The invention relates to a siphon according to the preamble of claim 1. Such a siphon is known from
Different couplings are known in the sanitary field. Outlet pipes are thus coupled by an adhesive sleeve which is adhered to both outlet pipes. If it is necessary to take expansion into account, both pipes can be provided with a sleeve comprising two sealing rings on the inside. An end of a pipe is inserted into each sealing ring so that a watertight connection is obtained, while allowing for possible length variations in the pipes as a result of expansion and contraction.
For the purpose of fixing a siphon or waste to a washbasin, bath or shower tray it is known to screw a cylindrical coupling part into the siphon or waste from above in the receptacle. Good sealing of the receptacle onto the siphon or waste is difficult here. It is usual to arrange a sealing ring between the receptacle and the siphon or waste, but there is a risk here of leakage occurring. This can be the result of the coupling part not being tightened sufficiently, or the result of expansion and contraction and setting of the sealing ring. Water then flows out of the receptacle round the outside of the coupling part and is not stopped by the usual sealing ring.
Shower trays and baths are further often rough on the underside because they are manufactured from sprayed polyester. Although the edge around the connection is then ground, it is considerably less smooth than the upper side of the receptacle. Also in the case of ceramic washbasins the underside is considerably rougher than the part visible during normal use.
Shower drains are in some cases provided on the underside with a tubular outflow. A siphon or a sleeve with sealing ring is usually pushed onto this tubular part, and an outlet pipe is then fixed to this sleeve.
It will be apparent from the above that a prior art pipe can be coupled by means of a slide connection or by means of a screw connection. The drawback of a screw connection is that it may possibly not be tightened sufficiently, whereby the connection will begin to leak.
The drawback of a plug-in sleeve with sealing ring is that the connection to a pipe is only kept in place as a result of the friction between the pipe and the sealing ring. The danger here is that the pipe can spring out of the plug-in sleeve, resulting in leakage.
It is now an object of the invention to provide a siphon wherein the above stated drawbacks are alleviated or even prevented.
This object is achieved with a siphon according to claim 1.
In the siphon according to the invention the advantages of the known prior art couplings are combined while the drawbacks are avoided. The seal on the cylindrical wall provides for a good seal in the case of coupling to for instance an outlet pipe. In addition, the coupling means on the second edge ensure that the coupling cannot be pulled apart without warning. The seal is arranged in the wall. Since the dimensions of the wall are predetermined, the compression, and thereby the sealing force of the seal, can thus also be precalculated. The seal does not therefore depend on for instance a tightening force.
In an embodiment of a coupling piece according to the invention the coupling means comprise screw thread. The advantage of this embodiment is that parts usual in the prior art can be coupled to a coupling piece according to the invention. The screw connection then provides for a reliable coupling, while the seal provides for the watertightness of the coupling.
In another embodiment of the coupling piece according to the invention the coupling means comprise a bayonet coupling. As with a screw connection, a secure connection can be obtained with a bayonet coupling. In addition, a bayonet coupling provides the additional advantage that some play is present in the coupling, whereby changes in length resulting from contraction and expansion can be easily compensated.
In a highly preferred embodiment of the coupling piece the cylindrical wall is stepped such that a first cylindrical part and a second cylindrical part are formed, wherein the first part has a larger diameter than the second part. The coupling means are preferably arranged on the second part.
The advantage of this embodiment is that prior art coupling parts can also be used. A smooth pipe can thus be easily inserted over the first cylindrical part with the seal, while a screw part can for instance be easily screwed into the second part provided the second part is provided with a screw thread.
In addition, an inserted smooth pipe can be secured by screwing in from above an additional coupling part which engages the threaded part.
In yet another embodiment of the coupling piece according to the invention the cylindrical wall comprises a telescopic wall part. Owing to the telescopic wall part the part with the coupling means and the seal can extend and thus correct for height differences. A siphon is often cast into a concrete floor. Foam plates can then be arranged thereon as insulation. A shower drain or the like is often already arranged in such foam plates. When the siphon lies too deeply in the concrete floor and the shower drain is fixed to the siphon, there is a chance of the foam plate being deformed. It is possible with the telescopic part to compensate for such height differences.
In addition, this embodiment provides the option of compensating variations in length. A shower tray or bath will thus deform when a person steps into it. The telescopic wall part can slide in and out and thereby compensate the variations in length.
The invention further relates to a combination of a coupling piece according to the invention and a cylindrical coupling part arranged in the cylindrical wall, wherein the coupling part comprises coupling means on one side for coupling to the coupling means of the coupling piece, and wherein the coupling part comprises a flat peripheral part on the opposite side for connection to the seal of the coupling piece.
Because the coupling part is provided with a flat peripheral part which co-acts with the seal and is provided with a part which co-acts with the coupling means of the coupling piece. The two functions are thus separate of each other and the reliability of both the coupling and the seal is guaranteed.
An outlet pipe can be arranged on the coupling part.
An additional advantage of the coupling part is that, once the various parts have been fitted, the coupling part can be removed, whereby the seal is accessible and can be easily replaced. This is because the seal is arranged on the inner side of the cylindrical wall. In a prior art siphon the seal is provided for instance between the housing and for instance a shower tray, and is therefore difficult to replace or not possible to replace.
The invention further comprises a siphon comprising a housing with an inflow opening and an outflow opening and a stench trap arranged between the inflow opening and the outflow opening, wherein a coupling piece according to the invention is arranged in the inflow opening.
With a siphon according to the invention a multifunctional siphon is obtained which can be coupled in known ways as well as in the manner according to the invention, wherein seal and coupling function separately of each other.
In a preferred embodiment of the siphon according to the invention the seal extends over the inflow opening and outside the housing. Such a seal provides for an additional sealing, particularly when the siphon is mounted against for instance a washbasin.
These and other features of the invention are further elucidated with reference to the accompanying drawings.
A wall 8 rising from bottom surface 4 is arranged in the housing. Upper edge 9 of standing wall 8 forms an elongate overflow edge which forms a part of the stench trap.
A coupling piece 10 according to the invention is arranged on inflow opening 5. This coupling piece 10 has a first cylindrical part 11 and a second cylindrical part 12. Provided in cylindrical part 11 is a groove 13 in which a sealing ring can be arranged. Screw thread is provided on the inner surface of cylindrical part 12.
Siphon 1 can be coupled by screwing a suitable bush into the inflow opening, the bush being provided on the underside with a screw thread and on the upper side with a smooth surface for lying against a sealing ring arranged in groove 13.
Sealing ring 19 is provided with a flexible flange 20 which runs round the outlet opening of a washbasin 21. A bush 22 is arranged from above in the outlet opening of washbasin 21. This bush is provided on the underside with a screw thread 23 which can engage screw thread 24 in the second cylindrical part 17.
Flexible flange 20 can optionally protrude once bush 22 has been arranged.
Bush 22 is provided on the top side with a flange 25 which lies against flexible flange 20 and presses it against washbasin 21. Because flexible flange 20 lies against the smooth, often glazed part of the washbasin, a reliable seal is provided. A second sealing ring can optionally be provided instead of flexible flange 20 in flange 25.
In a prior art siphon a sealing ring is provided between the housing of the siphon and for instance the washbasin. In the invention this sealing ring can now be omitted. An additional advantage is that there are fewer resilient parts present in the mounting. As a result there is less chance that, due to setting of the resilient parts, too much play occurs and leakage results.
Two bayonet slots 36 are arranged in central part 32.
A pipe 37 can be inserted on either side of coupling piece 30, wherein the end of pipe 37 is provided with a bayonet pin 38 which engages in one of the bayonet slots 36. The associated sealing ring 35 provides for the desired seal on the outer wall of pipe 37.
A depending wall 45 is arranged on inflow opening 41. This depending wall 45 has an elliptical cross-section and is provided with a peripheral groove 46 in which a sealing ring 47 is arranged.
Arranged in depending wall 45 is an elliptical part 48 in which a cylindrical wall 49 is provided. The lower part of cylindrical wall 49 is provided with screw thread 50. Arranged on the upper side of cylindrical wall 49 is a groove 51 in which a sealing ring can be placed.
Siphon 40 according to
In order to prevent elliptical part 48 sliding out of the housing, there is provided in depending wall 45 a groove 53 into which extends a protrusion 52 of part 48.
Shown in
Sealing ring 65 is provided with a flange 66 which runs on the top side of coupling piece 61 between washbasin 67 and coupling piece 61.
A bush 68 is arranged from above in the outlet opening of washbasin 67. This bush is provided on the underside with a screw thread 69 which can engage the screw thread in the second cylindrical part 63.
Bush 68 is provided on the top side with a flange 70. In this flange 70 is arranged a groove in which an 0-ring 71 is arranged. When bush 68 is screwed into coupling piece 61 the 0-ring 71 lies against washbasin 67. A first seal is hereby obtained.
This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.