Abstract: Attachable and detachable joints for use in pipe systems carrying pressured fluids are made using thermoplastics, preferably polyolefin, and provided with an integrally formed male spigot end and a female socket end. The joints are constructed using a push-fit principle. A sealing ring is inserted into the sealing groove of the female socket making the joint leak proof. Plastic or metal clamps are provided to sustain the longitudinal forces imposed on the joint exerted by the pressured fluid. The male spigot is provided with an integrally formed collar that serves as the holding surface to clamp resisting longitudinal forces.

Abstract: The invention describes easily attachable and detachable joints for use in pipe systems carrying pressured fluids. The pipes used for the purpose are made using thermoplastics, preferably polyolefin and provided with integrally formed male spigot end (1) and a female socket end (2). The invention also discloses a method of forming tubes along with their male spigot (1) and the female sockets (2). Joints made using the pipes provided with integral male (1) and female ends (2) are constructed using a push-fit principle. A sealing ring (10) is inserted in the sealing groove (3) of the female socket (2), making the joint leak proof. Plastic or metal clamps (6) are provided to sustain the longitudinal forces imposed on the joint exerted by the pressured fluid. The male spigot (1) is provided with an integrally formed collar (4) that serves as the holding surface to clamp resisting longitudinal forces. The joint is simple in its construction, easy to assemble in field, robust and cost effective.

Abstract: A device is described for implementing a socket on an end of crosscut plastic pipes (3) having a framework (4), having a transverse conveyor (27) for the plastic pipes (3), having at least two units situated along the transverse conveyor (27) in the framework (4), on the one hand, for heating the pipe ends (2) and, on the other hand, for widening the heated pipe ends (2) to form a socket, the units having jaw tools (16, 17), which externally enclose the pipe ends (2), and which can be fed transversely to the conveyance direction with the aid of actuators (18) mounted in the framework (4), and having at least one tool (7, 8), which is axially insertable into the pipe end (2) for at least one of the units.

Abstract: A method is described for producing a pipe end socket (3) made of thermoplastic material with a sealing ring (5) which engages in a form-fitting manner on the inside of the socket in a circumferential bead (4) and which comprises a sealing part (6) and a supporting part (7), with the sealing ring (5) being introduced into a preformed bead region and is then tightly held in a form-fitting manner in the circumferential bead (4) by a final forming of the preformed bead region. In order to provide advantageous process conditions it is proposed that the pipe end socket (3) with the circumferential bead (4) is preformed at a deformation temperature corresponding at least to the softening temperature with an overdimension which allows an insertion of the sealing ring (5), and after the cooling below the softening temperature and after inserting the sealing ring (5) said pipe end socket with the circumferential bead is pressed into the final shape by taking into account a cooling-induced shrinkage.

Abstract: The invention relates to a method for producing a pipe termination box (3) from thermoplastic material which comprises a sealing ring (5). Said sealing ring has a sealing part (6) and a support part (7) and positively engages on the box interior with a peripheral bead (4). The sealing ring (5) is introduced into a preshaped bead area and is then positively held in the peripheral bead (4) by shape-finishing the preshaped bead area. In order to create advantageous process conditions, the pipe termination box (3) is preshaped at a shaping temperature that corresponds at least to the softening temperature and is oversized to allow for the sealing ring (5) to be inserted. Once the box has cooled off below the softening temperature, it is compressed to the final shape with the sealing ring (5) inserted while allowing for shrinking that occurs during cooling-off.