DE3123644A1 - Sleeve piece of short overall length for connecting pipes with smooth-cylindrical ends - Google Patents

Abstract

Sleeve pieces of short overall length for connecting cylindrical pipes are preferred, in particular, in the field of sanitary engineering, where, owing to restricted space, one has to make do with short introduction paths for sealing the pipes in the sleeve piece. In particular in the case of horizontal pipe arrangements, a high transverse rigidity and strong axial securing of the pipe connection have to be ensured in order to avoid leakages. The invention solves this problem in that, by using a union nut (15a) as driving element, the press ring or the press-ring segments (37), connected to one another, exhibit a double-wedge-shaped cross-section and the union nut (15a) is provided, on its inwardly drawn collar (36), with a conical guide surface (39) for the outwardly directed part of the press ring or of the press-ring segments (37). The pipe end (18) sealed in the sleeve piece (11a) is thus secured to a greater extent with respect to forces in, and perpendicular to, the pipe axis. The invention is mainly applied for the connection of drainage pipes or discharge pipes with smooth-cylindrical ends. <IMAGE>

Description

Socket piece with a short overall length for connection

of pipes with smooth cylindrical ends Addition to patent (patent application P 31 08 06do29 The invention relates to a socket piece with a short overall length for connecting pipes with smooth cylindrical ends according to patent (patent application P 31 08 064.2).

In the main application is a socket piece with a short length Connection of pipes with smooth cylindrical ends described near each socket entrance comprises a sealing element, preferably a sealing rolling ring. At a The embodiment of this socket piece is a thread in the area of each socket inlet on the outside of the socket piece to screw on a union nut provided as Driving element for a press ring or a group of interconnected press ring segments ten serves. When the union nut is turned accordingly, the press ring or the group of compression ring segments through a conical guide surface at the socket inlet pressed against the outer wall of the pipe end, whereby this pipe end against forces is secured in and perpendicular to the pipe axis. One achieves in particular the required transverse rigidity and axial securing for horizontal pipe arrangements the pipe connection.

The invention is based on the object of this transverse rigidity and to further strengthen axial securing of the pipe connection.

According to the invention, this object is achieved in that when using a union nut as a driving element of the press ring or the interconnected Press ring segments have a double wedge-shaped cross-section and the union nut at their inwardly drawn collar with a conical guide surface for the outward directed part of the press ring or the press ring segments is provided. This double wedge-shaped When tightening the union nut, the cross-section becomes on the one hand through the conical Guide surface at the socket inlet and on the other hand through the conical guide surface on the inwardly drawn collar of the union nut pressed against the outer wall of the pipe end, advantageously coming into contact with the outer wall of the pipe end Area in the press ring according to the invention or

Press ring segments compared to those in the subject matter of the main application is much larger. While maintaining a short length of the socket piece the transverse axial support is provided by the outwardly directed part of the press ring or the press ring segments reinforced with a double wedge-shaped cross-section, so that in turn, the lever forces acting on the pipe end, especially in the case of horizontal pipe arrangements, can be better intercepted through the connection.

If, according to a further embodiment of the invention, the outside directed part of the press ring or the press ring segments made of a harder (tough and tough) Material than the inward one Part of the same exists, the axial securing of the pipe connection is additionally improved and the tightening of the union nut makes it easier. At the same time, another sealing element can be used can be omitted in the socket piece, since the inwardly directed part of the press ring or the press ring segments consist of a relatively soft elastomeric material and thus kahn take over the sealing function at the same time. This can reduce the overall length of the socket piece can be further reduced. Another advantage of this embodiment the invention is that the inside of such a socket piece very can be designed simply, so that manufacturing costs can be saved.

Lever forces acting on the connection from the pipe end are still better intercepted if, according to yet another embodiment of the invention, the outwardly directed part of the press ring or the press ring segments in their operative position extends beyond the collar of the union nut.

Yet another embodiment of the invention is characterized in that that the double-wedge-shaped cross-section is symmetrical with respect to a centrally arranged flat ring is formed.

This version makes assembly easier.

According to a further embodiment of the invention, the inside is of the press ring or the press ring segments are concave. This creates a full-surface Pressing the inside of the Press ring or the press ring segments favored.

The invention will then be described with reference to the drawings of an exemplary embodiment explained. 1 shows a sectional view of a socket piece in the form of a Double socket, in the lower half of which the smooth cylindrical end of a pipe is sealed is, while the parts before sealing are shown on the upper half of the double socket are; Fig. 2 is a sectional view of interconnected by a flat ring Press ring segments with a double-wedge-shaped cross-section along the line II - II in Fig. 3 and Fig. 3 a plan view of the part shown in Fig. 2, which in the embodiment of Fig. 1 is used.

The socket piece shown in FIG. 1 is a double socket 11a, but the socket piece can alternatively also at each end, e.g. one Branch piece may be provided.

The double sleeve 11a has on the outer circumference next to the two sleeve entrances a thread 14 each. On the in Fig. 1 below thread 14 is a Union nut 15a with an inwardly drawn collar 36 is screwed on. The union nut 15a serves as a drive element for compression ring segments 37, which have a symmetrical double-wedge-shaped Have cross-section and formed on a centrally arranged flat ring 17 are. In the embodiment, three such press ring segments 37 are provided, it however, it can also be more or less. The press ring segments 37 furthermore have only a relatively short arc length in relation to the circumference of the ring and they are positioned on the flat ring 17 at equal mutual intervals. The compression ring segments can, however, also have a considerably greater arc length and in extreme cases only be separated from one another by narrow slits. Alternatively, a continuous press ring can be used in place of these press ring segments with a double wedge-shaped cross-section (not shown) can be used.

The compression ring segments 37 are perpendicular to the flat ring 17 integrally formed that their concave, toothed in the circumferential direction inside 38 approximately with the inner diameter of the flat ring 17 is aligned. This inside diameter is kept slightly larger than the largest possible outer diameter of each smooth cylindrical pipe end 18 to be sealed. The compression ring segments 37 are inclusive of the flat ring 17 in the exemplary embodiment made of a tough, hard plastic.

In the lower half of the double socket 11a, a rolling ring 24 is made Illustrates rubber in sealing position. This rolling ring 24 is in front the insertion of the pipe end 18 into the double socket 11a in a standby area 25 (shown above in Fig. 1), which is followed inwardly by a Koinpressionsbund 26 on which a sealing ring space 27 is in turn connected. When inserting the pipe end 18 in the double sleeve 11a, the rolling ring 24 is carried along by friction and through the compression collar 26 deformed so that the rolling ring 24 abruptly in the immediately to the compression collar 26 adjoining the sealing ring space 27 expanded. To When the insertion movement has ended, the rolling ring 24 takes the position shown in FIG. 1 in the lower half of the double socket 11a in the sealing ring space 27.

To that sealed in the above manner in the double sleeve 11a To secure the pipe end 18 axially and, above all, to support it transversely axially in order to e.g. to absorb horizontal pipe arrangements from the pipe ends acting leverage, the compression ring segments connected to one another by the flat ring 17 37 with the double wedge-shaped cross-section with the aid of the union nut 15a in the Brought in Fig. 1 below drawn working position, for this purpose the Union nut 15a is screwed onto the relevant external thread 14 of the double socket 11a will.

At each socket inlet of the double socket 11a are in cuts or Recesses conical guide surfaces 9 for the inwardly protruding parts (halves) the press ring segments 37 are provided, the number and arc length of each of those the press ring segments 37 corresponds. Furthermore, the union nut 15a on her inwardly drawn collar 36 has a circumferential conical guide surface 39 which cooperates with the outwardly directed parts of the press ring segments 37. Of the double wedge-shaped cross-section of the press ring segments 37 is the conical guide surfaces 9 and 39 adapted so that when the press ring segments 37 are pressed into the socket inlet by appropriate rotation of the union nut 15a, the compression ring segments 37 radially deformed inwards and pressed against the outer circumference of the sealed pipe end 18 will.

In the exemplary embodiment, the outward-facing one extends Part of the compression ring segments 37 beyond the collar 36 of the union nut 15a. the Conical guide surfaces 9 on the two sleeve entrances are as above mentioned, in incisions or recesses, a rotation lock for the compression ring segments 37 form when the union nut for driving the compression ring segments in the respective Socket inlet is screwed on.

Although in the embodiment of FIG. 1, the rolling rings 24 Take over the sealing function, an annular lip seal can replace it or the like. (not shown) in a correspondingly modified inside double socket be provided.

In a further embodiment of the invention (not shown) the inwardly protruding part of the press ring segments or of the press ring can be significant shorter (smaller) than the outward protruding part, thereby further shortening the length of the socket piece can be achieved.

Claims (5)

Socket piece with a short overall length for connecting Pipes with smooth cylindrical ends according to patent (patent application P 31 08 064.2), characterized in that when using a union nut (15a) as a driving element the press ring or the interconnected press ring segments (37) have a double wedge-shaped Have cross-section and the union nut (15a) on its inwardly drawn Bund (36) with a conical guide surface (39) for the outwardly directed part of the press ring or the press ring segments (37) is provided. 2. socket piece according to claim 1, characterized in that the after outwardly directed part of the press ring or the press ring segments (37) from a harder one (tough and hard) material as the inwardly directed part of the same or the same consists. 3. socket piece according to claims 1 and 2 e, characterized in that that the outward part of the press ring or the press ring segments (37) in its active position extends beyond the collar (36) of the union nut (15a). 4. socket piece according to claims 1 - 33, characterized in that that the double wedge-shaped cross-section is symmetrical towards one centrally arranged flat ring (17) is formed. 5. socket piece according to claims 1 - 4, characterized in that that the inside (38) of the press ring or the PreB-ring segments (37) is concave is.