DE3705601C1 - Plastic-pipe coupling - Google Patents

Abstract

The invention relates to a coupling for a plastic pipe, comprising a joining piece having a clamping-lever closure in engagement therewith. The invention is characterised in that the joining piece exhibits a bore which is intended to receive the end portion of the pipe and in which there is inserted, in an annular groove, an O-ring for sealing the gap between bore and pipe. The clamping-lever closure is dimensioned such that, in its closed position, it adheres non-displaceably on the pipe without deforming said pipe to any great extent. Means for connecting the joining piece to the clamping-lever closure are provided. <IMAGE>

Description

The invention relates to a coupling for a plastic pipe, consisting of a connector and one with this in Engaging clamping lever lock.

Hose or pipe couplings, such as z. B. from DE-OS 35 11 289 are known, comprise as an integral part of the connector a spout on which the end of the Hose is pushed on. Requirement for The usability of a pipe coupling with a nozzle is that the reduction in the clearing brought about by the spout Cross-section and the cross-sectional jump do not interfere and also that the tube has enough flexibility to do so to be able to expand that it can be pushed onto the spout.

The aim of the present invention is to create a Coupling for hard plastic pipes. Such pipes will be used for example to inoculate concrete. For such Plastic pipes are not couplings with a socket suitable, because the ends of the plastic pipes can be do not expand to the extent that they can be postponed. Such pipes also have the requirement that they no change in the clear cross section in the May experience coupling area. For this reason too a coupling with a grommet is prohibited.

The invention is therefore based on the object To create coupling for plastic pipes that the meets the aforementioned requirements, namely on the one hand Attachment without grommet and also without Change in cross-section inside the plastic tube gets along.

To solve this problem, the invention Coupling for plastic pipe of the type mentioned proposed in which the connector has a hole for Includes the end portion of the tube in which a circumferential groove an O-ring to seal the gap is inserted between the bore and tube that the Tension lever lock is dimensioned so that it on the Pipe is immovable without deforming it and that Means for connecting the connector with the Tension lever lock are provided.

Such a plastic pipe coupling fulfills the demands made. Part of the clutch is missing, like a spout, which reduces the cross section and cause a cross-section jump inside the pipe would. Furthermore, deformation, in particular of the tube when using the invention Coupling not required.

In addition, the plastic pipe coupling according to the invention other notable benefits:

• - To form the coupling, commercially available parts such as Connector and cocking lever lock are used,  
• - The coupling is extremely simple at the end of the pipe to attach, first the connector on the Pushed on the pipe end, and then the Clamping lever lock placed around the tube with which Connector engaged and tensioned,
• - The clutch is released in the reverse order just as easy
• - The clutch is also inexpensive to manufacture because it is largely made up of commercially available parts,
• - The coupling does not damage the Plastic tube, the tension lever lock is just like that dimensioned that he was on the plastic tube adheres immovably without this when clamping Significantly deform or damage.

Advantageous embodiments of the clutch according to the invention for plastic pipes are in the subclaims featured.

An exemplary embodiment is shown in the drawing. It shows

Fig. 1 is a side view,

Fig. 2 is a view from the direction A,

Fig. 3 shows a longitudinal section and

Fig. 4 shows a cross section along the line BC .

The coupling according to the invention comprises the connector 1 and the tension lever lock 2 . The connector 1 has a threaded portion 3 at one end and at the other end it has a bore 4 into which the end of the tube 5 is inserted. An O-ring 7 is inserted into a circumferential groove 6 in the bore 4 . This seals the gap between the bore 4 and the peripheral surface of the tube 5 .

The connector 1 also has an outer peripheral surface 8 at the end opposite the threaded section 3 , the function of which is explained below.

In axial section to the connector 1 , the tension lever lock 2 is placed around the tube 5 . It is a commercially available tension lever lock, known for. B. from DE-OS 20 26 158 and 28 49 880, the structure and mode of action therefore need not be described here. The tension lever lock 2 is axially aligned with the connector 1 so that the heads 9 of the extended pivot bolts 10, 11 of the tension lever lock 2 lie in the same cross-sectional plane as the outer circumferential groove 8 of the connector 1 . Then the tension lever lock is closed, the cheeks 12, 13 of the two half-shells 14, 15 of the tension lever lock 2 being pressed into the surface of the tube 5 and thus being axially immovably connected to the tube 5 by static friction. In the end, the cheeks 12, 13 can be equipped with a toothing (not shown here) or with claws which penetrate into the surface of the tube when the tension lever lock 2 is closed to improve the adhesion. In the closed position of the clamping lever lock 2 , the heads 9 engage in the outer circumferential groove 8 and thus secure the connection piece 1 against axial displacement relative to the tube 5 . If the heads 9 of two pivot bolts 10, 11 engage in the outer circumferential groove 8 in the connection piece 1 , there is no risk that the tension lever lock 2 will pull out of the way.

• 1 connector
  2 clamping lever lock
  3 threaded section
  4 hole
  5 pipe
  6 circumferential groove
  7 O-ring
  8 outer circumferential groove
  9 head
  10 pivot bolts
  11 pivot bolts
  12 cheek
  13 cheek
  14 half-shell
  15 half-shell

Claims (5)

1. Coupling for a plastic tube, consisting of a connecting piece with a clamping lever lock which engages with it, characterized in that the connecting piece ( 1 ) has a bore ( 4 ) for receiving the end portion of the tube ( 5 ), in which in a circumferential groove ( 6 ) an O-ring ( 7 ) for sealing the gap between the bore ( 4 ) and tube ( 5 ) is inserted so that the clamping lever lock ( 2 ) is dimensioned so that it sticks to the tube ( 5 ) in its closed position without significantly deforming it, and that means for connecting the connecting piece ( 1 ) to the clamping lever lock ( 2 ) are provided. 2. Coupling according to claim 1, characterized in that means for releasably connecting the connecting piece ( 1 ) with the clamping lever lock ( 2 ) are provided. 3. Coupling according to claim 1 or 2, characterized in that the two pivot bolts ( 10, 11 ) of the clamping lever lock ( 2 ) each have a head ( 9 ) at their extended end, which in the closed state of the clamping lever lock ( 2 ) in an outer circumferential groove ( 8 ) engages in the connector ( 1 ). 4. Coupling according to one of claims 1 to 3, characterized in that the side cheeks ( 12, 13 ) of the half-shells ( 14, 15 ) of the clamping lever lock ( 2 ) are provided with teeth or with claws. 5. Coupling according to claim 3 or 4, characterized in that the clamping lever lock ( 2 ) with the heads ( 9 ) of two pivot pins ( 10, 11 ) engages in the outer circumferential groove ( 8 ) in the connector ( 1 ).