IL46835A - Sealing ring for pipe couplings - Google Patents

Description

The invention relates to a sealing ring for pipe for connection of especially sewerage pipes made of a material such as asbestos the ring being manufactured from an elastic material such as rubber or a plastic material and insertable between the pipes to be connected and an outer the sealing ring seen being designed with a hollow profile and having at least one sealing bead projecting The invention also relates to an injection mold or vulcanizing for the production of said sealing ring having two molding parts movable with respect to other provided with a frame limiting outer surface of the sealing ring being Known pipe couplings for connection of pipes consis generally of a coupling surrounding the pipes to be connected of two rings of solid to be inserted each betwee the coupling and the two In order to obtain a good sealin the of the pipes are calibrated to the pipe axis in order to obtain cylindrieal sealing against which the sealing rings These worked sealin surfaces are usually produced durin the manufacture of the As the pipes are often shortened on the building especially when connections for living quarters are the cylindrical sealing surfaces must becalibrated manuall The turning operation of the pipes on the building site in order to produce the sealing surfaces is There is already known a sealing ring of the type described above in which there is provided a bead projecting laterally from one of the hollow profile perpendicular to the axis of the This bead is however deformed in such a manner that the pipe coupling is tight against inner pressure but not against outer It is an object of the present invention to avoid these disadvantages and to create a sealing ring for pipe couplings for the connection of which permits achievement of a tight sealing against internal as well as against external without the need of turning the ends of the pipes in order to form a suitable sealing This is obtained in accordance with the present invention by means of a sealing ring of the type described in which the sealing bead extends along the inner ference of the preferably extruded hollow profile of the sealing ring which is insertable into a suitable recess of the pipe the sealing bead extending in a radial direction towards the axis of the This design of the sealing ring guarantees that the latter abuts preferably on the circumference of the pipe if it is placed in a recess of the it bears on the inner side of the this permitting to overcome large tolerances and to obtain an excellent sealing effect towards inner pressure as well as towards outer Upon insertion of the sealing the sealing bead is bent so that two sealing portions are pipe circumference and a second one surface of the sealing bead and the In this manner bigger tolerances between the outer diameter of the pipe and the inner diameter of the coupling can be especially because the hollow profile is deformable in a broader region on the other the sealing bead can be bent under any desired According to the invention there is provided on the outer side of the sealing ring at least one slot which penetrates into the inner side of the ring and preferably extends over the whole circumference of the This embodiment permits to produce the sealing ring according to the invention in a very simple manner by extrusion or vulcanisation in a The core necessary for producing the hollow profile in the mold can be held in this No matter in which manner the ring was it must have a radial prestress by which it is pressed against the bottom of the ring By providing the slot it is also possible to hold the sealing ring with lateral prestress in the recess of the If this is not necessary and the slot is only provided for facilitating the tion of the hollow this slot can be closed again after the ring has been This can be in accordance with the in that the opposite edges of the slot situated in a radial plane with respect to the ring axis are connected by welding and the Another solution consists in the insertion into the slot of at least the sealing with the Alternatively a band extending over the whole circumference of the outer side of the ring and covering the slot can be In order to obtain pipe connections which do not even at relatively high outer and inner another embodiment according to the present invention consists in a sealing ring provided with three sealing beads and having a waved This embodiment guarantees an optimal sealing Furthermore the sealing ring may advantageously be provided with several waved parallel recesses extending over its It is also possible to provide labyrinth shaped In using the sealing ring according to the invention the sealing eet of the pipe connection is guaranteed even if the outer diameter of the pipe shows The preferred embodiment of the mold for extrusion or vulcanization of the ring according to the invention is characterized by the fact that the frame of the mold has a projecting edge extending towards the axis of the ring whose conforms to the shape of the hollow space and slot to be produced in the sealing The invention is described in more detail in connection with the following drawings which represent several of the sealing ring according to the 1 represents a through a pipe coupling for connection of in which the sealing ring according to the invention is 2 shows the sealing ring of the pipe coupling according to 1 on a larger show other embodiments of a sealing ring according to the 6 represents a through an extrusion or vulcanization mold for production of a sealing ring according to the 7 is a top view of a mold according to 8 is a section through a further embodiment of a sealing ring according to the invention and 9 shows a pipe coupling obtained by using a sealing ring according to The pipe coupling represented in 1 serves for the coupling of two pipes 1 and 2 consisting of asbestos The pipe coupling comprises a coupling 3 surrounding the pipes 1 and 2 made of a fiber material asbestos the coupling having two recesses 4 and 5 situated at a distance and into each of which there is inserted a sealing ring 10 made of rubber or plastics according to the The latter is represented in the drawing in the already deformed Between the two recesses 4 and 5 there is provided a further small recess 6 into which an abutting ring 7 of substantially is and against which the pipes 1 and 2 bear with their front The ring 7 is not necessary for producing only for keeping the pipes at a certain distance from each other and for centering The sealing ring 10 according to the present invention is represented in 2 on a larger scale in the undeformed The sealing ring is designed as a hollow profile and provided with a sealing bead 11 situated at a distance from the center of the and in a radial direction towards the axis A of the The sealing lip 11 is made integrally with the hollow profile and tapers in the direction of the axis A of the The hollow profile is also provided with a slot 12 extending in a radial plane with respec to the axis A of the the slot extending the outside of the sealing ring towards the inner hollow The opposite edges of the slot are closed by These edges may also be closed by means of spot The inner diameter of the sealing ring 10 according to the invention is smaller than the outer diameter of the pipes 1 and 2 to be In producing the pipe coupling according to 1 the sealing ring 10 is thus deformed in such a manner that the sealing bead 11 is and the hollow profile is In this manner there are formed two sealing surfaces placed at a distance from each which in case of a small play between the pipe and the causing a correspondingly strong are united into a single and wider sealing surface In 3 the sealing ring 20 is also hollow and is provided with a sealing lip 21 tapering in of the sealing This slot extends in a radial plane to the axis of the The width of the slot 22 corresponds to the average thickness of the sealing bead Upon insertion of the sealing ring the slot 22 is somewhat In 4 the sealing ring 30 is shaped as a hollow profile with a sealing lip situated excentrically with respect to the middle of the and is also provided with a slot extending along its The slot is closed by means of an insert 33 of The web of the insert 33 projects into the slot while the bar of the insert 33 bears against the outer side of the profile and is glued or welded to the The sealing ring 40 of 5 is provided with a radially extending round hollow space and with a sealing lip 41 extending in the direction of the axis of the The hollow space is open towards the outer side of the sealing This opening is designated as The opening 42 may of course be as shown in by means of a surrounding band or the like which is glued to the outer face of the sealing ring Instead of the embodiments represented in 4 and the slot may also be closed by filling with glue or with a filler material containing a the hollow space may also be filled with a foam 6 and 7 represent a mold for extrusion d r o u to the This mold consists substantially of two portions 70 and 71 movable with respect to each between which there is placed a holding frame which forms the outer side the sealing ring to be The holding frame 72 has a projection 73 facing towards the axis A of the the of this projection corresponding to the inner space of the hollow sealing ring and to the slot to be provided in the The sealing produced in this withdraw by spreading the two halves of the hollow profile separated by the projection 73 which protrudes into the The sealing rings according to the invention can also be produced by extrusion of the hollow The sealing ring represented in 8 consists of such an extruded hollow whose ends are connected in order to form the Along the inner circumference of this sealing ring there are provided three sealing lips extending radial direction towards the axis A of the The sealing lips and 53 which are made integrally with the ring 50 are tapered in the direction of the ring axis The outer circumference of the sealing ring that side of hollow profile which is opposite the sealing lips 52 and 53 a waved It contains several waved recesses 54 extending over the of the ring and disposed parallel to each Instead of such waved there may also be provided through shaped recesses or grooves a or The pipe coupling represented in 9 serves for the connection of two pipes 60 and 61 made of asbestos The pipe coupling consists of a coupling 62 surrounding pipes 60 and 61 made of a fibrous for example asbestos the coupling being provided with two recesses 63 and 64 of substantially rectangular placed at a distance from each and into each of which a sealing ring made of an extruded hollow profile is Between the abutting ends of the two pipes there is also provided an abutting ring In the sealing ring represented in this figure the edges and lateral surfaces are substantially The sealing lips 52 and 53 extend only in the space distributed by the two edge It is also important that the sealing lips are situated directly at a radial distance from the hollow space of the The hollow space of the ring may be of any desired as results from the is however preferred that the section of the hollow space be oval or The outer edges of the sealing lips are also preferably The sealing ring according to the present invention is preferably used for pipe couplings of sewerage channels having an inner diameter of up to 600 In these pipes the tolerance of the outer diameter is from mm to however in a coupling in which a sealing ring according to the present invention is used the sealing effect of the coupling is not influenced by this big This coupling has the advantage to stand up to the requirements of inner pressure even if the pipes are at an angle or are not aligned inside the If necessary and upon appropriate calculation of the the sealing against outer pressure is also Regarding the sealing of sewerage pipes against inner this is based on Austrian standard B 5062 according to which the coupling has to withstand an inner pressure of 4 during 15 The values of the sealing effect against outer pressure should preferably to 5 water column during 20 insufficientOCRQuality

Claims (9)

1. Pipe coupling for connection of pipes, especial¾ sewerage pipes, made e.g. from fiber material such as asbestos-cement, said coupling being provided with a sealing ring made from an elastic working material,,, such as rubber or a plastios material, and inse table betx«een the pipes to be connected and a coupling surrounding the latter, the sealing ring having a hollow profile and being provided with at least one projecting sealing lip, wherein the sealing lip extends along the inner circumference of the ring which is preferably constituted by an extruded hollow profile insertable into recesses provided in the coupling, said lip projecting in radial direction towards the axis of the ring, and the cross-section of the ring corresponds at least partly to the cross-section of the recesses.

2. A pipe coupling according to Claim 1 , wherein the sealing ring having a hollow profile is provided at its outer surface with a circular slot ¾hich extends into the hollow inside of the sealing ring and preferably extends substantially over the whole circumference of the sealing ring.

3. A sealing ring according to Claim 2, wherein the opposite edges of the slot situated in a radial surface with respect to the axis of the ring are connected by gluing, welding or the like.

4. A sealing ring according to Claim 2, wherein a preferably f-shaped insert is provided in the slot extending over the outer circumference of the sealing ring, and this insert is connected with the sealing ring at least on the outer surf ee of the latter.

5. · A sealing ring according to Claim 2, wherein at least one band extending over the whole circumference of the sealing ring is provided for covering the slot existing in the sealing ring.

6. A sealing ring according to Claim 1, wherein the outer circumference of the ring, which is preferably provided with three sealing beads, has a waved configuration.

7. A sealing ring according to Claim 6, wherein parallel extending wave shaped recesses are provided over the outer circumference of the sealing ring.

8. A sealing ring according to Claim 6, wherein the wave shaped recesses have a labyrinth-like shape.

9. An extrusion or vulcanization mold for the manufacture of a sealing ring according to any of Claims 1-8 with two opposite movable molding parts between which there is provided a molding frame limiting the outer face of the sealed ring to be manufactured, wherein the molding frame is provided with a flange-like projection pointing towards the axis A of the ring, the cross-section of this projection corresponding to the hollow portion and to the slot to be formed in the sealing ring. PC/md