Patent GB-1279689-A (GB)
Title: Pipe socket joint
IPC: F16L47/12
Filed: 1969-07-22
Abstract: 1279689 Pipe joints INDUSTRIEBEDARF GmbH 22 July 1969 [22 July 1968] 36901/69 Heading F2G A spigot and socket pipe joint is characterized by an annular chamber being formed by cooperation of a groove within the socket and another groove on the outer surface of the spigot, the chamber having end portions of tapering wedge shaped cross-section and being adapted to be filled with a hardening filler via a hole through the outer wall of the socket. The spigot and socket may have a non-circular (e.g. triangular) cross-section so that mutual rotation is prevented or alternatively an independent third member may co-operate with both spigot and socket to prevent said rotation. As shown in Fig. 3 the spigot 1 and socket 3 are sealed by a packing 22 and a further packing between the end of the spigot and the socket. A resilient ring 28 retains the joint against axial separation prior to casting the filler into chamber 8. Holes 13, 14 are for admitting filler and venting respectively. Recesses 23<SP>1</SP> are spaced about the spigot periphery and complementary recess 23 are formed in the socket to accommodate elements 24 to prevent rotation. The elements 24 may be of circular or wedge shaped cross-section (Figs. 4 and 5, not shown). In an alternative joint (Fig. 6, not shown) the socket groove defining the chamber has annular teeth and the complementary spigot groove has two axially extending arcuate recesses.  In a further joint (Fig. 12, not shown) the seal 22 and ring 28 are dispensed with and rotation is prevented by a pin arranged tangentially to the spigot, engaging a notch in the spigot surface at its mid point and being held by its ends in recesses in the socket. Two pipes may each make a spigot and socket joint of the invention with a common socket in the form of a sleeve. The pipe ends may be separated by a sealing ring and each pipe may be locked to its respective sleeve end by two tangential pins (Fig. 10, not shown) or alternatively, the pipes may abut end to end at a conical interface, only one tangential pin being used at each end (Fig. 15, not shown). In a further form for joining lined pipes (Fig. 9, not shown) the sleeve is formed by two stub sleeves (3<SP>1</SP>), (3<SP>11</SP>) arranged end to end and having a sealing ring (42) disposed between them. The seal (42) may be in a different plane to the pipe ends, the latter being sealed by a resilient ring 40 between their ends, the ring 40 having an inwardly directed channel to accommodate an outwardly extending flange (39) on a lining sleeve (38). Each pipe end is locked against rotation with the sleeve by pins (36) as in the embodiment of Fig. 3. The stub sleeves are held together by being compressed between loose end rings (29) by the bolts which prevent mutual rotation of the stub sleeves. In an alternative form of the Fig. 9 embodiment the join of the pipes and the join of the stub sleeves are in the same radial plane and a common seal (42) suffices for both. In yet another alternative, the join between the stub sleeves may be in a plane oblique to a radial plane of the sleeve. In a further embodiment two pipes are joined end to end by a common sleeve by joints according to the invention (Fig. 16). In this example the pipes 1, 2 are locked against mutual rotation with each other and not with the sleeve 3. A spacer 53 of insulative material is disposed between the pipe ends and has axial dovetail like extensions 67 which mate with corresponding recesses in the pipe ends. Resilient sealing collars 65, 65<SP>1</SP> prevent leakage, and the position of the sleeve is controlled by the abutment of rings 66 with the sleeve end.