IE48202B1

IE48202B1 - A pipe socket

Info

Publication number: IE48202B1
Application number: IE1226/79A
Authority: IE
Original assignee: Wavin Bv
Priority date: 1978-02-21
Filing date: 1979-08-08
Publication date: 1984-10-31
Also published as: GB2014681B; NL175457B; DE2906317A1; IE791226L; GB2014681A; BE874335A; DK75379A; FR2417711A1; NL7801932A; NL175457C

Abstract

A pipe coupling connects to a corrugated pipe part (12) the inner side of the coupling being provided with a projecting coupling member in the form of a cam 2 having a radially disposed wall 3 and ridges 4 for increasingly radially deforming the corrugated pipe part (12) when it is pushed into the pipe coupling.

Description

Ihe invention relates to a pipe socket for making a tensile resistant pipe connection with a corrugated pipe end.

Corrugated pipes have transverse or helical grooves so that in axial cross-section their walls define a series of wave crests and valleys, and it is known to make a tensile resistant pipe connection with a corrugated pipe end by pressing wall portions of a socket radially inwardly to form coupling members which engage the pipe end in a wave valley thereof.

Such a pipe connection has the disadvantage that it does not provide sufficient tensile resistance owing A,j. to the deformabi1ity of the coupling members and the wave crests of the corrugations, particularly if a small number of coupling members is employed. The provision of a small number of coupling members is, however, required from cost considerations since the cost expenditure involved in forming these coupling members by deformation of the socket wall is very high. Moreover the whole operation is rather complicated and thus the cost price of the pipe 48303 socket may become unacceptably high.

The present invention seeks to provide a pipe socket which provides a better tensile resistant pipe connection with a corrugated pipe end.

According to the invention there is provided a pipe socket for making a tensile resistant pipe connection with a corrugated pipe end, the inside of the socket being provided with at least one radially inwardly extending coupling member, adapted to engage the TO corrugated pipe end in a wave valley thereof , and at least one radially inwardly extending deforming member extending axially inwardly of the or each coupling member, the coupling and deforming members beinn arranged such that when the corrugated pipe end is pushed into the socket to make a pipe connection therewith, the or each deforming member engages the pipe end to locally deform the pipe end radially inwardly and to cause the pipe to be urged radially outwardly axially inwardly of the location of the or each coupling member.

It will be appreciated that the urging of the pipe radially outwardly axially inwardly of the or each coupling member enhances the engagement of the latter with the corrugated pipe end and provides an improved 48303 tensile resistant pipe connection.

Preferably the or each deforming member is arranged for gradually increasingly radially inwardly deforming the pipe end as it is pushed into the socket. The deforming members in the preferred embodiments of the invention described hereinafter comprise axially inwardly extending wedge-shaped elements, the heights of which increase in the axially inward direction. Such an arrangement allows for a difference in the inner diameter of the socket and the crest diameter of the corrugated pipe end.

The or each deforming member may extend axially inwardly substantially from a radial plane through the or each coupling member.

The socket may be provided with two, diametrically oppositely located deforming members which are preferably located symmetrically with respect to a single coupling member.

The socket may be provided with a single deforming 20 member and a single coupling member, the coupling member being located diametrically opposite the deforming member.

The socket is preferably formed as a plastics injection moulding with the or each coupling member formed as a cam extending axially inwardly the radially inner surface of the cam makinq an acute angle of,say,70° with the socket wall .

The invention also includes a pipe connection comprising a socket as defined in the preceding paragraphs and a corrugated pipe end inserted in said socket, the or each coupling member engaging in a corrugation valley of the pipe end, the or each deforming member locally deforming the pipe end radially inwardly and the pipe end being urged radially outwardly axially inwardly of the location of the or each coupling member.

In order that the invention may be well understood, two embodiments thereof, which are given by way of example only, will now be described with reference to the accompanying drawings, in which: Fig.l is an axial cross-section of a double socket pipe connector; Fig.2 is a fragmentary axial cross-section of a pipe length having a socket at one end; and Fig.3 illustrates a pipe connection comprising a corrugated pipe end inserted into one socket of a double socket pipe connector similar to that shown in Figure 1.

The inside of each of the two sockets of the double 5 socket pipe connector 1 shown in Figure 1 is provided with a radially inwardly extending coupling member formed as a cam 2 having a surface 3 for engaging a corrugated pipe end inserted in the socket, as will be described hereinafter. The inside of each socket 10 is also provided with two radially inwardly extending deforming members comprising wedge-shaped elements 4,4a, the heights of which increase in the axially inwardly direction to a maximum height at the centre 5 of the connector 1. The wedge-shaped deforming 15 elements 4,4a of each socket are disposed diametrically opposite each other and extend axially inwardly substantially from a radial plane through the surface 3 of the cam 2 as indicated by the reference numeral 6. The elements 4, 4a extend parallel to the central 20 axis of the connector in the illustrated embodiment and whilst this is preferred it is not essential. The radially inner surface 7 of each wedge-shaped deforming element forms the hypotenuse of the axial cross-section of this element and the width of the surface is relatively small with respect to the total inner circumference of the wall of the socket.

The caw 2 of each socket extends axially inwardly with its radially inner surface making an acute angle of,say,70° to the wall of the socket,and the deforming elements 4.4a are disposed symmetrically with respect to the cam.

At the centre of the connector there is provided an abutment collar 8 for preventing a pipe end inserted in either of the sockets of the connector being pushed through into the other socket. To this end, the collar extends radially inwardly of the elements 4,4a, its radially inner surface 8a having a diameter less than the minimum distance between the elements 4, 4a.

In Figure 2, there is shown a socket 11 formed at the end of a pipe length 10. As in the sockets shown in Figure 1, the inside of the socket 11 is provided at circumferentially spaced apart locations with radially inwardly extending coupling and deforming members. In socket 11, however, only one deforming member -wedge-shaped element 4 - is shown, although it is to be understood that two diametrically opposite deforming members could be provided. Further, in socket 11 two coupling members-cams 2-are provided. 4820 2 Figure 3 illustrates the way in which a tensile resistant pipe connection is made between a socket of a double socket similar to that shown in Figure 1 and a pipe end of a corrugated pipe 12.

In order to make the pipe connection the corrugated pipe end is pushed into the socket, the wedge-shaped deforming elements engage the pipe end and locally deform the pipe end radially inwardly and cause the pipe end to be urged radially outwardly towards the socket wall axially inwardly of the location of the cam, thus enhancing the engagement of the pipe end by the cam 2 whose surface 3 engages the side of a wave valley of the pipe end. As will be appreciated, the fact that the pipe end is gradually increasingly radially inwardly deformed by the deforming member, by virtue of their wedge-shape in the embodiment, results in a similar gradually increasingly radially outwardly urging of the pipe end axially inwardly of the cam further enhancing the cooperation between the cam and the corrugated pipe end to provide a tensile resistant connection between the socket and the pipe end.

It will also be noted that the cam is located a significant distance axially inwardly of the mouth of the socket, designated 9 in Fig. 1 so as to 48302 effect a reliable connection.

It is to be understood that other arrangements of circumferentially spaced coupling and deforming members may be used. For example a coupling member may be disposed diametrically opposite a deforming member, and a cam may be disposed 90° from a deforming member.

Whilst the deforming members in the embodiments are solid ridges, it is to be understood that they may be hollow, thus saving material.

Claims

1. A pipe socket for making a tensile resistant pipe connection with a corrugated pipe end, the inside of the socket being provided with at least one radially inwardly extending coupling member, 5 adapted to engage the corrugated pipe end in a wave valley thereof, and at least one radially inwardly extending deforming member extending axially inwardly of the or each coupling member, the coupling and deforming members being arranged such that when 10 the corrugated pipe end is pushed into the socket to make a pipe connection therewith, the or each deforming member engages the pipe end to locally deform the pipe end radially inwardly and to cause the pipe to be urged radially outwardly axially 15 inwardly of the location of the or each coupling member.

2. A pipe socket as claimed in claim 1, wherein the or each deforming member is arranged for gradually increasingly radially inwardly deforming the pipe 20 end as it is pushed into the socket.

3. A pipe socket as claimed in claim 1 or 2, wherein the or each deforming member comprises an axially inwardly extending wedge-shaped element, η the height of which increases in the axially inward di rection.

4. A pipe socket as claimed in any one of claims 1 to 3, wherein the or each deforming member extends 5 axially inwardly substantially from a radial plane through the or each coupling member.

5. A pipe socket as claimed in any one of the preceding claims,wherein the socket is provided with two, diametrically oppositely located said 10 deforming members.

6. A pipe socket as claimed in any one of the preceding claims provided with a single said coupling member.

7. A pipe socket as claimed in claim 6 when appended 15 to claim 5, wherein said deforming members are located symmetrically with respect to said coupling member.

8. A pipe socket as claimed in any one of claims 1 to 4, provided with a single said coupling member and a single said deforming memher- th® coupling 20 member being located diametrically opposite the deforming member.

9. A pipe socket as claimed in any one of the preceding claims, wherein the radially inner surface of the or each coupling member extends axially inwardly at an acute angle to the wall of the socket.

10. A pipe socket as claimed in any one of the 5 preceding claims, and formed as a plastics injection moulding.

11. A double socket pipe connector, wherein each socket comprises a socket as claimed in any one of the preceding claims and wherein an annular abutment 10 is located between the sockets.

12. A double socket pipe connector as claimed in claim 11, wherein the or each deforming member of each socket extends to said annular abutment and said annular abutment extends radially inwardly of said 15 deforming members.

13. a pipe connection comprising a pipe socket as claimed in any of claims 1 to 10 or a pipe socket of a pipe connector as claimed in claim 11 or 12 and a corrugated pipe end inserted in said 20 socket, the or each coupling member engaging in a corrugation valley of the pipe end, the or each deforming member locally deforming the pipe end radially inwardly and the pipe end being urged A8Z03 radially outwardly axially inwardly of the location of the or each coupling member.

14. A pipe socket for making a tensile resistant pipe connection with a corrugated pipe end and substan5 tially as herein described with reference to Figure 1 or 2 of the accompanying drawings.