DE19840593B4 - Device for producing a flat roof drainage - Google Patents

Abstract

Flat roof drainage device ("roof drain") (200; 300; 400), with:
At least one funnel-shaped hollow body (1.1) which has a first pipe socket (3.1) opening into a drainage inlet pipe and a first, peripheral clamping element (1) in the form of a retaining collar (4.1),
- At least one second clamping element (2; 3), which in the assembled state forms a releasable clamping connection (1, 2; 2, 3) with the at least one roof covering sheet (7; 70) to be laid by the clamping elements (1; 2; 3) is supported, characterized in that
The second clamping element (2) is part of a funnel-shaped hollow body (1.2) which has a second pipe socket (3.2) and a holding collar (4.2) and which is provided with latching elements (11.1 .... 11.n),
- The first hollow body (1.1) is provided with first locking elements (10.1 ... 10.n) which, with the locking elements (11.1 ... 11.n) of the second hollow body (1.2), provide a first locking connection (11.1 ... 11 .n; 10.1 ... 10.n)
The second hollow body (1.2) is provided with second latching elements (51), which form a second latching connection (serration 51; 31) with latching elements (31) of a third clamping element (3),
The third clamping element (3) is part of a funnel-shaped, third hollow body (1.3) having a third pipe socket (3.3) and a holding collar (4.3),
- And that a first clamp connection (1; 2), in which with the first and the second clamping element (1; 2) a first roof covering sheet (70) is held, and a second clamp connection (2; 3), in which with the second and the third clamping element (2; 3), a second roof covering sheet (7) is held after the locking connections (11.1, 11.n, 10.1 ... 10.n; 51; 31) have been made by compressing the nested hollow bodies (1.1 , 1.2, 1.3).

Description

• – wenigstens einem trichterförmigen Hohlkörper, der einen in ein Entwässerungseinlaufsrohr einmündenden ersten Rohrstutzen und ein erstes, peripheres Klemmelement in der Form eines Haltekragens aufweist, und
• – wenigstens einem zweiten Klemmelement, das im zusammengesetzten Zustand mit dem ersten eine lösbare Klemmverbindung bildet, mit der wenigstens eine zu verlegende Dachabdeckungsbahn von den Klemmelementen gehaltert ist.

The invention relates to a device for producing a flat roof drainage ("roof drain"), comprising:

• - At least one funnel-shaped hollow body which has a first pipe socket opening into a drainage inlet pipe and a first, peripheral clamping element in the form of a retaining collar, and
• - At least one second clamping element, which in the assembled state forms a releasable clamping connection with the first, with which at least one roof covering sheet to be laid is held by the clamping elements.

From the DE 195 10 955 A1 a multi-part roof drain fitting is known, the upper part of which is provided with a ring for receiving screws in the area of a square retaining collar. At the corners of the upper part and at the corners of a square lower part of the roof drain fitting, adjustment elements are leveled, each comprising a row of holes arranged on a wall of the lower part and a leaf spring engaging in this. With the aid of the adjusting elements, the distance between the holding collar of the upper part and a bottom of the lower part can be adjusted according to the thickness of the thermal insulation layer on the roof structure. The leaf spring setting elements only have the function of keeping the distance. A sealing clamp connection, however, is made with the help of a clamp ring and screw connections.

The disadvantage of the valve according to the state of the Technology that a special, robust clamping ring is used must, the over several screw connections are attached to the upper part. Furthermore the manufacture of such a flat roof bushing is expensive and time consuming. Moreover the sealing membrane is broken by the screws and thus their sealing effect is reduced.

It is therefore the task an inexpensive flat roof bushing device to specify for the production of a flat roof drainage ("roof drain"), their attachment to the flat roof provides the desired stability and tightness guarantee can and which can be mounted on the flat roof in a few simple steps, without having to make screw connections.

• – das zweite Klemmelement Teil eines trichterförmigen, einen zweiten Rohrstutzen und einen Haltekragen aufweisenden Hohlkörpers ist, der mit Rastelementen versehen ist,
• – der erste Hohlkörper mit ersten Rastelementen versehen ist, die mit den Rastelementen des zweiten Hohlkörpers eine erste Rastverbindung ausbilden,
• – der zweite Hohlkörper mit zweiten Rastelementen versehen ist, die mit Rastelementen eines dritten Klemmelementes eine zweite Rastverbindung (Kerbverzahnung) ausbilden,
• – das dritte Klemmelement Teil eines trichterförmigen, einen dritten Rohrstutzen und einen Haltekragen aufweisenden dritten Hohlkörpers ist,
• – und dass eine erste Klemmverbindung, bei der mit dem ersten und dem zweiten Klemmelement eine erste Dachabdeckungsbahn gehaltert ist, und eine zweite Klemmverbindung, bei der mit dem zweiten und dem dritten Klemmelement eine zweite Dachabdeckungsbahn gehaltert ist, nach der Herstellung der Rastverbindungen durch das Zusammendrücken der ineinandergeschobenen Hohlkörper zustande gebracht sind.

According to the invention, this object is achieved in that

• The second clamping element is part of a funnel-shaped hollow body which has a second pipe socket and a retaining collar and is provided with latching elements,
• The first hollow body is provided with first latching elements which form a first latching connection with the latching elements of the second hollow body,
• The second hollow body is provided with second locking elements which form a second locking connection (serration) with locking elements of a third clamping element,
• The third clamping element is part of a funnel-shaped third hollow body having a third pipe socket and a retaining collar,
• - And that a first clamping connection, in which a first roof covering sheet is held with the first and the second clamping element, and a second clamping connection, in which a second roof covering sheet is held with the second and the third clamping element, after the locking connections have been produced by the compression the nested hollow bodies are brought about.

• – das zweite Klemmelement Teil eines zweiten trichterförmigen, einen zweiten Rohrstutzen und einen Haltekragen aufweisenden Hohlkörpers sein, der ebenso Rastelemente aufweist, wobei
• – der erste Hohlkörper mit Rastelementen versehen ist, die mit den Rastelementen des zweiten Hohlkörpers eine Rastverbindung ausbilden können,
• – die Rastelemente als Rastringelemente mit scharfen Kanten ausgebildet sind,
• – an einer Innenfläche des ersten Rohrstutzens des ersten Hohlkörpers erste und an einer Mantelfläche des zweiten Rohrstutzens des zweiten Hohlkörpers zweite peripher in einer dichten Anordnung übereinander, wenigstens teilweise umlaufende Rastringelemente aufgebracht sind,
• – die Klemmverbindung nach der Herstellung der Rastverbindung durch das Zusammendrücken der beiden ineinander geschobenen Hohlkörper zustande gebracht ist.

The object of the invention can also be achieved by a two-part device of the type mentioned, in which

• - The second clamping element be part of a second funnel-shaped, a second pipe socket and a retaining collar having a hollow body, which also has locking elements, wherein
• The first hollow body is provided with latching elements which can form a latching connection with the latching elements of the second hollow body,
• The locking elements are designed as locking ring elements with sharp edges,
• - On an inner surface of the first pipe socket of the first hollow body, the first and on a lateral surface of the second pipe socket of the second hollow body, the second circumferential, at least partially circumferential locking ring elements are applied in a dense arrangement,
• - The clamp connection is established after the locking connection has been established by compressing the two hollow bodies pushed into one another.

The roof covering membranes in the sense of the invention a sealing membrane as the first and a thermal insulation layer arranged underneath as a second waterproofing membrane. The roof waterproofing can also be made there are two geomembranes or the like.

The first clamping connection holds the respective sealing membrane and the second clamping connection so tightly the thermal insulation layer that all moisture of the flat roof, such as rain or condensation water, is specifically drained off via the drainage inlet pipe. At least one of the pipe sockets preferably has at least one slot for condensate drainage.

It has been shown that the locking connection the hollow body so strong that the upper one separates them Retaining collar several times on its circumference with a suitable special tool must be lifted gradually. It should be noted that preferably only part of the periphery of the pipe socket Snap elements must be provided. In addition, guaranteed the locking connection permanent stability of the device.

Instead of an annular stop can several stop elements arranged on the circumference of the pipe socket be attached, or manufactured in one piece with the pipe socket his. In this case, the double-walled construction of the pipe socket to be dispensed with.

It is expressly pointed out that both the three- and the two-part device without one double-walled or having the individual stop elements Pipe socket can get by. The serrations are a prerequisite for this the respective mutually compatible pipe socket, which is a clamp connection can form.

In a modified embodiment of the Invention can on at least one, preferably on the pipe socket of the lowest (in assembled state) hollow body projections be arranged, each pointing in the direction of the axis of the device and a kind of leadership for the next Form pipe socket. The tabs can springy his. In the one with the ledges provided pipe socket, the upper pipe socket is pressed in. By the areas between the peripheral projections the condensed water will drain off.

The hollow body can be made of plastic, in particular made of hard plastic, or of metal, in particular of a corrosion-resistant steel or be made of aluminum.

Embodiments of the invention and the features of further subclaims are given below the drawing. The figures in the drawing show in detail:

1 a device consisting of two hollow bodies for producing a roof drain, in an exploded view;

2 according to a roof gully jamming a sealing membrane 1 , in a perspective view;

3 Locking elements for a device according to 1 and 2 , in an enlarged cross-sectional view;

4a a first device consisting of three hollow bodies for producing a roof drain;

4b to 4e other embodiments of a three-part device for producing a roof drain, and

5 an arrangement of a roof drain in a flat roof.

In 1 is a device 100 to produce a roof drain, which in principle consists of two funnel-shaped hollow bodies 1.1 and 1.2 consists.

The terms "above", "below", "upper", "lower" relate to a fixed position of the hollow body, which, for example, from the 1 emerges and corresponds to the assembled state.

The two hollow bodies 1.1 . 1.2 each have a peripheral clamping element 1 . 2 in the form of a collar 4.1 . 4.2 on that over a truncated cone 2.1 . 2.2 in a pipe socket 3.1 . 3.2 transforms. The collar 4.1 . 4.2 is on the broad base side 12 of the truncated cone 2.1 . 2.2 arranged. The wall of the truncated cone 2.1 . 2.2 is opposite the pipe socket 3.1 . 3.2 inclined at an angle of 45 °. Other angular positions in the range from 30 ° to 60 ° appear possible.

The pipe socket 3.2 of the hollow body 1.2 is on the outside with a variety of peripheral locking elements 11.1 ... 11.n Mistake. The locking elements 11.1 ... 11.n are in a tight arrangement on a lateral surface 16 of the pipe socket 3.2 brought in. Like a longitudinal axial cut through the pipe socket 3.2 (see. 3 ) shows, form the locking elements 11.1 ... 11.n a sawtooth configuration, with sharp edges 19.1 .... 19.n the locking elements 11.1 ... 11.n upwards, in the direction of the truncated cone 2.2 point (cf. 3 ).

The pipe socket 3.1 of the first hollow body 1.1 has similar, with the locking elements 11 of the hollow body 1.2 compatible locking elements 10.1 .... 10.n on. In the same longitudinal axial section through the pipe socket 3.2 (see. 3 ) form the locking elements 10.1 .... 10.n a similar, sawtooth-shaped configuration in which the sharp edges 20.1 .... 20.n the locking elements point downwards. The locking elements 10.1 .... 10.n also run peripherally on an inner surface 17 of the pipe socket 3.1 , which is interrupted and divided into several locking ring element fields 21 (Groups of teeth) like it 1 shows are divided.

Furthermore, the pipe socket 3.1 of the hollow body 1.1 , a double wall 8th . 9 on that on one of the base side 12 opposite side 13 of the hollow body is arranged, and on the pipe socket 3.1 an annular inner pocket 5 forms in which the pipe socket 3.2 of the hollow body 1.2 can intervene with its locking elements. The wall 9 and the connecting web molded onto them can also be omitted.

The device 100 is still a sieve 15 ( 1 , above) assigned, the dimensions of which correspond to the size of the retaining collar 4.2 correspond.

In 2 is based on the 1 beschrie bene device 100 shown in their assembled state. A vertical drainage inlet pipe 6 extends to an opening 24 working on a flat roof 20 (see. 5 ) is incorporated. On the drainage inlet pipe 6 is over a sealing ring 14 the lower hollow body 1.1 stated. The flat roof 20 has a concrete ceiling 22 , a heat-insulating layer 23 and a bitumen waterproofing membrane 7 which is rolled out over the (later) gully and cut out in the opening area. The bitumen waterproofing membrane 7 with its opening edge 26 on the lower hollow body 1.1 flanged in such a way that this over the retaining collar 4.1 and the truncated cone 2.1 almost to the pipe socket 3.1 enough. The second, upper hollow body 1.2 is with its pipe socket 3.2 in the ring-shaped inner pocket 5 of the hollow body 1.1 pushed into place. After making the locking connection 11.1 ... 11.n ; 10.1 .... 10.n a clamp connection has been created with the two retaining collars 4.1 . 4.2 and additionally with the truncated cones 2.1 . 2.2 the geomembrane 7 holds clamped.

In 4a is a first three-part embodiment (reference number 200 ) to see the device in which three similarly designed, nested hollow bodies 1.1 . 1.2 . 1.3 form two locking and two clamp connections. The pipe socket 3.1 . 3.2 . 3.3 the hollow body 1.1 . 1.2 . 1.3 each end with a peripheral edge 32.1 . 32.2 , and 32.3 , The middle pipe socket 3.2 shows on its outer surface 36 locking elements 11.1 ... 11.n on that with the on an inner surface 37 of the bottom, widest pipe socket 3.1 introduced locking elements 10.1 ... 10.n the first locking connection (serration 10.1 ... 10.n ; 11.1 ... 11.n ) form. On an inner surface 38 of the middle pipe socket 3.2 are also locking elements 51 introduced with the locking elements 31 of the top pipe socket 3.3 the second locking connection (serration 31 . 51 ) form. The locking elements 31 . 51 correspond to the locking elements already described in detail 10.1 ... 10.n ; 11.1 ... 11.n , Accordingly, by the holding collar 4.1 . 4.2 . 4.3 after making the locking connections 10.1 ... 10.n ; 11.1 ... 11.n ; 31 . 51 two clamp connections formed. The lower hollow body 1.1 is over a sealing ring 18 from a common part of the drainage inlet pipe 6 surround. The condensed water can go through slits 27 that on the middle pipe socket 3.2 are introduced into the drainage inlet pipe 6 flow.

In a second three-part embodiment (reference number 300 ) is the pipe socket 3.1 of the lowest hollow body 1.1 as with the device 100 , double-walled (cf. 4b ). The top pipe socket 3.3 is graduated so that the condensation water through the middle pipe socket 3.2 incorporated slot 27 into the drainage inlet pipe 6 can flow.

The pipe socket is preferred of the first hollow body double-walled, so that this is an annular inner pocket has, which is compatible with the pipe socket of the second hollow body is and thus an annular Stop forms. The locking elements are on an outer wall of the inner pocket and accordingly on a lateral surface of the second pipe socket applied. Alternatively, the inner surface of the pipe socket of the first hollow body and the inside wall of the inside pocket can be equipped with locking elements.

A third three-part embodiment ( 4d ) represents a device 400 for the production of a roof drain, in which the lowest pipe socket 3.1 three stop elements pointing in the direction of the axis 29 has. Otherwise the device 400 the device 200 similar.

In 4e is a fourth three-part embodiment as a device 500 shown, in which, instead of a bottom hollow body provided with a truncated cone, a hollow body consisting of two cylindrical parts 1.1 is selected. The top, attached to the collar 4.1 subsequent, cylindrical part 41 the lowest hollow body goes over a paragraph 42 into the pipe socket forming the lower cylindrical part 3.1 about. This embodiment is technically feasible, but not equivalent to the "conical" embodiments with regard to the drainage of the condensed water.

Finally in 4c a further, different embodiment (reference number 600 ) shown, in which the lowest pipe socket 3.1 no locking elements, but three peripherally arranged, centrally directed projections 28 has. The middle hollow body 1.2 is with its pipe socket 3.2 pressed into the lowermost hollow body, the elastic projections 28 a resilient guide for the pipe socket 3.2 form. The condensed water can pass through the areas between the peripheral projections 28 into the drainage inlet pipe 6 flow.

Instead of the rolled out membrane or additionally can a deformable bitumen or PVC adhesive flange in the roof drain Form of a preferably rectangular arc can be connected.

The hollow body 1.1 . 1.2 and 1.3 are made of a hard plastic, preferably hard polyvinyl chloride. Metals are also suitable for production. The locking elements 10 . 11 . 31 . 51 can be made together with the pipe socket, but can also be applied subsequently.

100 up to 600

contraption

1.1 1.2, 1.3

hollow body

2

clamping element

2.1 2.2, 2.3

truncated cone

3

clamping element

3.1

first pipe socket

3.2

second pipe socket

3.3

third pipe socket

4.1 4.2, 4.3

retaining collar

5

inside pocket

6

Drainage inlet pipe

7

geomembrane

8th, 9

double wall

10.1, ... 10.n

locking elements

11.1, ... 11.n

locking elements

12

Base side

13th

page

14

seal

15

scree

16

lateral surface

17

Inner surface

18

sealing ring

19.1, ... 19.n

edge (out of 11)

20.1, ... 20.n

edge (of 10)

20

flat roof

21

Locking ring element field (Tooth group)

22

concrete ceiling

23

thermal barrier

24

opening

26

opening edge (v. 7)

27

slot

28

head Start

29

Stop element

31

locking elements

32.1, 32.2, 32.3

(Peripheral) edge

36

lateral surface

37

Inner surface

38

Inner surface

39

lateral surface

41

(Cylindrical) part

42

paragraph

51

locking elements

70

geomembrane

Claims (13)

Flat roof drainage device ("roof drain") ( 200 ; 300 ; 400 ), with: - at least one funnel-shaped hollow body ( 1.1 ) which has a first pipe socket opening into a drainage inlet pipe ( 3.1 ) and a first, peripheral clamping element ( 1 ) in the form of a collar ( 4.1 ), - at least one second clamping element ( 2 ; 3 ) which, when assembled, has a releasable clamp connection with the first ( 1 . 2 ; 2 . 3 ) with which at least one roof covering sheet to be laid ( 7 ; 70 ) of the clamping elements ( 1 ; 2 ; 3 ) is held, characterized in that - the second clamping element ( 2 ) Part of a funnel-shaped, a second pipe socket ( 3.2 ) and a collar ( 4.2 ) having hollow body ( 1.2 ) with locking elements ( 11.1 .... 11.n) is provided, - the first hollow body ( 1.1 ) with first locking elements ( 10.1 ... 10.n ) is provided with the locking elements ( 11.1 ... 11.n ) of the second hollow body ( 1.2 ) a first locking connection ( 11.1 ... 11.n ; 10.1 ... 10.n ) form, - the second hollow body ( 1.2 ) with second locking elements ( 51 ) is provided with locking elements ( 31 ) a third clamping element ( 3 ) a second locking connection (serration 51 ; 31 ) train, - the third clamping element ( 3 ) Part of a funnel-shaped, a third pipe socket ( 3.3 ) and a collar ( 4.3 ) having third hollow body ( 1.3 ) - and that a first clamp connection ( 1 ; 2 ), with the first and the second clamping element ( 1 ; 2 ) a first roof covering sheet ( 70 ) and a second clamp connection ( 2 ; 3 ), with the second and the third clamping element ( 2 ; 3 ) a second roof covering sheet ( 7 ) is held after the locking connections have been made ( 11.1 . 11.n . 10.1 ... 10.n ; 51 ; 31 ) by compressing the hollow bodies pushed together ( 1.1 . 1.2 . 1.3 ) are accomplished. Flat roof drainage device (roof drain) ( 100 ), with: - at least one funnel-shaped first hollow body ( 1.1 ) which has a first pipe socket opening into a drainage inlet pipe ( 3.1 ) and a first, peripheral clamping element ( 1 ) in the form of a collar ( 4.1 ), and - at least one second clamping element ( 2 ) which, when assembled, has a releasable clamp connection with the first ( 1 . 2 ) with which at least one roof covering sheet to be laid ( 7 ; 70 ) of the clamping elements ( 1 . 2 ) is held, characterized in that - the second clamping element ( 2 ) Part of a second funnel-shaped, a second pipe socket ( 3.2 ) and a collar ( 4.2 ) having hollow body ( 1.2 ), the locking elements ( 11.1 ... 11.n ), - the first hollow body ( 1.1 ) with locking elements ( 10.1 , ... 10.n ) is provided with the locking elements ( 11.1 ... 11.n ) of the second hollow body ( 1.2 ) a snap connection ( 11.1 ... 11.n ; 10.1 ... 10.n ) can form - that the locking elements as locking ring elements ( 11.1 ... 11.n ; 10.1 ... 10.n ) with sharp edges ( 19.1 ... 19.n ; 20.1 ... 20.n ) are formed, with an inner surface ( 17 ) of the first pipe socket ( 3.1 ) of the first hollow body ( 1.1 ) first and on a lateral surface ( 16 ) of the second pipe socket ( 3.2 ) of second hollow body ( 1.2 ) second peripherally in a dense arrangement one above the other, at least partially circumferential locking ring elements ( 11.1 ... 11.n ) are applied, and - the clamp connection ( 1 . 2 ) after the snap connection ( 11.1 ... 11.n . 10.1 ... 10.n ) by compressing the two hollow bodies pushed into each other ( 1.1 . 1.2 ) is accomplished. Device according to claim 1, characterized in that - on an inner surface ( 37 ) of the first pipe socket ( 3.1 ) first, on a lateral surface ( 36 ) of the second pipe socket ( 3.2 ) second and on an inner surface ( 38 ) of the second pipe socket ( 3.2 ) third and on a lateral surface ( 39 ) of the third pipe socket ( 3.3 ) fourth peripherally in a dense arrangement one above the other, at least partially circumferential locking ring elements ( 11.1 ... 11.n ; 10.1 ... 10.n ; 31 ; 51 ) as locking elements with sharp edges ( 19.1 ... 19.n ; 20.1 ... 20.n ) are arranged and - the first snap connection by compressing the first and the second pipe socket ( 3.1 . 3.2 ) and the second locking connection by compressing the second and third pipe socket ( 3.2 . 3.3 ) is accomplished. Device according to claim 1 or 2 or 3, characterized in that the first, second and third locking ring elements ( 11.1 ... 11.n ; 10.1 ... 10.n ; 31 ; 51 ) have a sawtooth-shaped configuration in cross section. Device according to one of claims 1 to 4, characterized in that the locking elements or locking ring elements ( 11.1 ... 11.n ; 10.1 ... 10.n ; 31 ; 51 ) on at least one of the pipe sockets ( 3.1 . 3.2 . 3.3 ) interrupted and into several locking ring element fields ( 21 ) are divided. Device according to one of claims 1 to 5, characterized in that - the hollow body ( 1.1 ; 1.2 ; 1.3 ) one truncated cone each ( 2.1 . 2.2 . 2.3 ) on the widespread base side ( 12 ) the collar ( 4.1 . 4.2 . 4.3 ) is arranged - and that the truncated cone ( 2.1 . 2.2 . 2.3 ) on its holding collar ( 4.1 . 4.2 . 4.3 ) opposite side ( 13 ) the pipe socket ( 3.1 ; 3.2 . 3.3 ) connects. Device according to one of claims 1 or 4 to 6, characterized in that the latching elements ( 10.1 ... 10.n ; 11.1 ... 11.n ; 51 ; 31 ) on the pipe socket ( 3.1 . 3.2 . 3.3 ) are applied. Device according to one of claims 1 to 7, characterized in that at least one of the pipe sockets ( 3.1 . 3.3 ) at least one stop element ( 29 ) for the corresponding pipe socket to be pushed into this. Device according to one of claims 1 to 8, characterized in that - at least one of the pipe sockets ( 3.1 ; 3.3 ) a double wall ( 8th . 9 ), which on the pipe socket ( 3.1 ; 3.3 ) an annular inner pocket ( 5 ) forms - the locking elements ( 10.1 ... 10.n ) on the inside pocket ( 5 ) are applied - and that the with locking elements ( 11.1 ... 11.n ) provided pipe socket ( 3.2 ) in the pipe socket ( 3.1 ; 3.3 ) hollow body to be pushed into the inner pocket ( 5 ) is compatible. Device according to at least one of the preceding claims, characterized in that on at least one of the pipe sockets ( 3.1 . 3.2 . 3.3 ) at least one opening or one slot ( 27 ) is incorporated for water drainage. Device according to at least one of the preceding claims, characterized in that at least one of the hollow bodies ( 1.1 ; 1.3 ) on its pipe socket ( 3.1 . 3.3 ) with at least three peripherally arranged and centrally directed, preferably resilient projections ( 28 ) for receiving the in the hollow body ( 1.1 ; 1.3 ) hollow body to be inserted ( 1.2 . 1.3 ) is provided. Device according to at least one of claims 6 to 11, characterized in that the truncated cone ( 2.1 . 2.2 . 2.3 ) the hollow body ( 1.1 . 1.2 . 13 ) opposite the pipe socket ( 3.1 . 3.2 . 3.3 ) is inclined at an angle of (30 ° to 60 °, preferably at an angle of approximately 45 °. Device according to at least one of the preceding claims, characterized in that the hollow body ( 1.1 . 1.2 . 1.3 ) are made of plastic, especially hard plastic, or of metal.