Coupling body for a plug connection of pipelines, in particular plastic pipelines

A coupling element of a plug connector for tubing, the coupling element comprising:

• a retaining screw having a screw shaft with an outer threaded section at an anterior area in the screwing-in direction, the screw shaft connecting to an actuating section located posterior to the screwing-in direction, an inner passage opening runs in axial direction through the retaining screw, a contact shoulder located in the passage opening and extending radially inward to the longitudinal axis, a retaining element configured as a toothed disc or toothed ring is arranged on the contact shoulder, and an annular sealing element mounted on the passage opening posteriorly in the screwing-in direction to the toothed disc or toothed ring in a peripheral groove, the peripheral groove being open toward the passage opening and having a groove base and two mutually opposite side walls ending at the groove base,
• a sleeve-shaped spacing element arranged between the retaining element and the annular sealing element, the retaining element being held in an axial direction between an anterior end face in the screwing-in direction of the spacing element and the contact shoulder, the mutually opposing side walls of the peripheral groove including an anterior side wall in the screwing-in direction formed by a posterior end face in the screwing-in direction of the spacing element, and the spacing element having an axial length bridging an area of inward deformation of a wall of an inserted tube when the retaining element is under load and biting down with the teeth into the wall of the inserted tubing such that the annular sealing element abuts against an undeformed area of the tube wall,
• a locking element mounted in the passage opening, an anterior end face of the locking element forming the posterior side wall of the peripheral groove, the locking element including a push-through opening at its posterior end in the screwing-in direction, a portion of the locking element defining the groove base and one of the mutually opposed groove walls of the peripheral groove, the groove base being formed by a sleeve-shaped outer threaded section, an end-side end face of the sleeve-shaped outer threaded section forming a stop surface delimiting movement of the spacing element, and the outer threaded section being in threaded engagement with an inner threaded section of the passage opening.

A coupling element of a plug connector for tubing, the coupling element comprising:

• a retaining screw having a screw shaft with an outer threaded section at an anterior area to the screwing-in direction, the screw shaft connecting to an actuating section located posterior to the screwing-in direction, an inner passage opening runs in axial direction through the retaining screw, a contact shoulder located in the passage opening and extending radially inward to the longitudinal axis, a retaining element configured as a toothed disc or toothed ring is arranged on the contact shoulder, and an annular sealing element mounted on the passage opening posteriorly to the screwing-in direction to the toothed disc or toothed ring in a peripheral groove, the peripheral groove being open toward the passage opening and having a groove base and two mutually opposite side walls ending at the groove base, the sealing member being in engagement with the groove base,
• a sleeve-shaped spacing element arranged between the retaining element and the annular sealing element, the retaining element being held in an axial direction between an anterior end face in the screwing-in direction of the spacing element and the contact shoulder, the mutually opposing side walls of the peripheral groove including an anterior side wall in the screwing-in direction formed by a posterior end face in the screwing-in direction of the spacing element, and the spacing element having an axial length bridging an area of inward deformation of a wall of an inserted tube when the retaining element is under load and biting down with the teeth into the wall of the inserted tubing such that the annular sealing element abuts against an undeformed area of the tube wall,
• a locking element engaged with a surface defining the inner passage opening, an anterior end face of the locking element forming the posterior side wall of the peripheral groove, a portion of the locking element defining the groove base and one of the mutually opposed groove walls of the peripheral groove, the groove base being formed by a sleeve-shaped exteriorly threaded section of the locking element.