HRP20000514A2 - Coupling sleeve for the connection of two plastic pipes - Google Patents

Description

The invention relates to a coupling for connecting two plastic pipes, which plastic pipes are inserted into the oppositely lying front sides of the coupling, with the ends of the coupling having a clamping ring on the inside, the clamping ring having a clamping cone on the outside, and a clamping cone on the inside sides one or more clamping ribs, and the receiving part of the clamping ring has a clamping counter-cone, whereby the inserted plug ends are tightly clamped and secured against pulling out due to the alternating action of pulling back between the clamping cone and the clamping counter-cone. The clamping ring is a common steel clamping ring, which has a functional slit laid parallel or diagonally to the longitudinal axis of the coupling. Connectors are used especially for connecting underground pipes for cables.

In the case of the known coupling of the design described in the introduction, at least one of the clamping ring receptacles is made as a frontally open clamping ring receptacle, into which a clamping counter-ring with a cone with a clamping counter-cone is inserted. Both the frontally located open receiving part of the inserted steel connecting part (clamp) and the anti-conical clamping ring are fixed by means of a connecting head (coupling) with a threaded annular transfer nut. Seals are also provided, which are shaped as lip seals and consisting of a trapezoidal support ring and a custom shaped (page 2 of original) sealing lip on the support ring insertion device. The well-known connecting head proved to be suitable, but it is necessary to improve it, especially in terms of production technique and assembly-technical aspect.

The purpose of the invention is to create a connecting head of the type described in the introduction, which is simple and characterized by monragation-technical and performance simplicity.

For the solution of this task, the invention teaches that both clamping ring receptacles at the end of the coupling of the coupling heads should be designed as frontally closed chambers and that the respective clamping counter-cone in the area of the chamber on the inside is shaped so that it falls into the coupling head. At the same time, the invention starts from the knowledge that the production and assembly of the coupling head can be performed particularly simply, when the clamping conical ring is dispensed with on both sides. Only both steel clamping rings have to be placed in the chamber, whereby the counter-cone clamp is already inserted into the shape during the production of the connecting head in the area of the chamber. In addition, the transfer nut can be dispensed with on both sides, because the clamp ring receptacles are designed as end-closed chambers. As a result, both plastic tubes can be pushed into the open faces of the coupling head, without having to be fixed with a toggle nut. It is surprising that the connection head according to the invention enables a safe connection of all plastic pipes despite the simple construction and simple assembly.

According to a further proposal of the invention, at least one seal is provided on both sides of the connecting head, that the seals are shaped like O-rings. Therefore, lip seals are no longer needed, because simple O-rings are used, so that the places where the seals are inserted are characterized by simple shapes.

According to the preferred embodiment, both places for placing the seals are arranged behind the place for placing the clamping rings. The coupling head can have end faces of the same internal diameter, so that plastic pipes with push-in ends of the same external diameter can be introduced into both end faces. If there is also the possibility, that the front sides have different internal diameters, so that on both front sides, or in both front sides, they can introduce plastic pipes with ends for influencing different external diameters. In this form of performance, it creates a connecting head according to the invention, the so-called reduction coupling head.

In the following, the invention is explained in more detail on the basis of only one example in the drawing. The schematic view shows:

Figure 1. average section through the connecting head according to the invention, i

Figure 2. object according to Figure 1 in another embodiment.

The pictures show a connecting head-coupling for connecting two plastic pipes 2, which can be inserted into the coupling 1 with their connecting, plug-in ends 3. In the end parts of the coupling 1, there is always one receiving part 4 for the clamping ring 5 inside. the ring 5 has a clamping cone 6 on the outer circumference and one or more clamping ribs 7 on the inside. The clamping ring 4 has a clamping cone 8. The introduced connecting ends are tightly clamped by alternating friction caused by the alternating action between the clamping cone 6 and the clamping countercone 8. The ends themselves plastic pipes 2 or their ends are only indicated in the pictures.

Both clamping ring receptacles 4 are designed as a chamber 4 from the front side. In the area of both chambers 4, the respective clamping countercone 8 is shape-adjusted into the coupling 1 on the inside. In addition, both sides of the seal receptacles 9 are provided for seals 10, whereby both seals 10 are shaped as O-rings. Both receptacles for gaskets 9 for O-rings 10 are located in the direction of insertion (arrow A) behind the receptacles of clamping rings 4.

While with the coupling 1 according to drawing 1 both end faces 3 have the same diameter (internal), both end faces 3 in the embodiment according to drawing 2 show different internal diameters.

Accordingly, plastic pipes 2 with plug-in ends of different outer diameters can be inserted into both front sides 3, so that this form of performance forms a reduction coupling head = coupling.

Claims (5)

1. Coupling (coupling head) for connecting two pipes made of plastic (2), which can be inserted into the oppositely lying front sides (3) of the coupling (1) with the plug ends, where in the end parts of the couplings (1) on the inner side there is one clamping ring (4) for one clamping ring (5), where the clamping ring (5) has a clamping cone (6) on the outer circumference, and one or more clamping ribs (7) on the inside, and the clamping ring holder (4) has one clamping counter-cone (8), whereby the prominent ends of the pipe are clamped and secured against pulling out due to the alternating effect of friction during pulling between the clamping cone (6) and the countercone (8), indicated by the fact that both clamping ring receptacles (4) are made from the front edge side as closed chambers ( 4) and that the respective clamping countercone (8) in the area of both chambers (4) on the inside should match the shape of the coupling (1). 2. The coupling (1) according to claim 1 has at least one seal holder (9) for one seal (10), characterized in that the seals (10) are shaped as O-rings. 3. Couplings (1) according to claim 1 or 2, characterized by the fact that both seal acceptances (9) for O-rings (10) are arranged in the direction of insertion behind the acceptance part of the clamping ring (4). 4. Connectors (1) according to one of claims 1 to 3, characterized in that both front sides (3) have the same inner diameter. 5. Coupler (1) according to one of claims 1 to 3, characterized in that both front sides have different internal diameters.