SU917710A3 - Device for forming bell-mouthed portion with groove in thermodeformable pipe - Google Patents

Abstract

1450821 Forming grooved bell ends on pipes JOHNS-MANVILLE CORP 21 Jan 1974 [23 Oct 1973] 2684/74 Heading B5A [Also in Division F2] An internal groove is formed in the bell end of a PVC pipe by pushing the pipe over a hard rubber sealing gasket projecting from a supporting core so that a groove is formed by the gasket, and then deforming the groove (see Fig. 12) to reduce its extent. The gasket is left in the groove or can be replaced; several gaskets and retaining members can be used. As described, the gasket 26 (Fig. 10) is seated in a recess of a lubricated and heated steel core 54. A plurality of pivoted ramp bars 68 are projected from the core by rods 73 actuated by a frusto-conical surface 71 (Fig. 5). The heated pipe end is pushed over the core, ramp bars and gasket until it meets a stop 56, whereafter the ramp bars are spring retracted flush with the core (Fig. 12) and the pipe end is drawn on to the core by suction and air pressure. A plurality of plungers 90, 104 mounted on an annular support 72 (Fig. 5) are operated by pistons or linkages to deform the pipe groove about the gasket (Fig. 12) to lock the gasket in position. After fluid cooling, the pipe is withdrawn from the core, with the gasket riding up an inclined surface of the core recess. The plungers 90, 104 comprise a plurality of straight edged members 94 (Fig. 7) that form a plurality of opposing or staggered locking projections in the pipe. Alternatively, arcuate plungers form a continuous locking projection adjacent the groove edges or in the body of the groove.

Description

The invention relates to arm’s engineering.

A device for the tight connection of two pipes, containing a cylindrical rod with circumferential grooves and a groove under the sealing element, the outer diameter of the latter being larger than the diameter of the rod [1].

The known device is not reliable enough.

The purpose of the invention is to increase the reliability of the device.

This goal is achieved by the fact that a turning element fixed at one end on the rod is installed in the recess, the rotating element is made of several plates.

In FIG. 1 shows a device, a section; in FIG. 2-5 - stages of the process of obtaining a thermally deformable pipe. bell with a kayavka.

The device comprises a cylindrical rod 1, around the circumference of which a recess 2 and a groove 3 are placed, in which the sealing element is placed

4. A pivot element 5 is installed in the recess 2, fixed at one end to the rod 1. Inside the cylindrical • rod 1, a cone-shaped movable element 7 is placed that interacts with its beveled part with the rod 8. The pivot element 5 is made of several composite plates.

The device operates as follows.

When heating the end section of the thermo-deformable pipe of the corresponding size to the limits of elastic deformation, this end is placed outside the cylindrical rod 1. Then, the end section of the pipe is moved along the beveled part of the cylindrical rod 1, which causes the end of the pipe to deform when interacting with the sealing element 4, the rotary elements 5 are fixed in corresponding inclined positions. Then, the pivoting elements 5 are displaced to their original horizontal position.

When moving the end section, it fits tightly along the contour of the nylindrical rod 1 with the formation of 5 sections of the corresponding shape. After receiving the side walls using the groove-deforming elements, the rotary elements 5 are moved back to the retracted position. The obtained end of the bell is allowed to cool to a temperature below the limits of elastic deformation by prolonged curing at room temperature or using a coolant. With costa-15 precise cooling of the end of the socket, it is separated from the cone-shaped movable rod 1, and the sealing element 4 remains inside the groove (not necessary).

Claims (2)

Claim 1. A device for receiving a thermally deformable pipe a bell with a groove for a sealing element, comprising a cylindrical rod with a groove located around the circumference and a groove for a sealing element, the outer diameter of the latter being larger than the shaft gauge, characterized in that, in order to increase reliability, a groove is installed a swivel element fixed at one end to the rod. 2. The device according to p. ^ Characterized in that the rotary element is made integral.