GB2159225A

GB2159225A - A device for connecting a hose end to a connecting sleeve

Info

Publication number: GB2159225A
Application number: GB08511911A
Authority: GB
Inventors: Karl Weinhold
Original assignee: Individual
Current assignee: Individual
Priority date: 1984-05-15
Filing date: 1985-05-10
Publication date: 1985-11-27
Also published as: DE3417924A1; GB2159225B; GB8511911D0; ES286757U; DE3417924C2; FR2564563B1; CA1260514A; FR2564563A1; ZA853213B; DD234057A1; AT391539B; ATA108085A; ES286757Y

Abstract

A device for connecting a hose end to a connecting sleeve, having a bush on to which a hose end can be pushed, a hose clamp consisting of several shell parts (16,17) and a tension lever lock surrounding the connecting sleeve, the shell parts each having a clamping flange which rests on the hose, and a holding flange (26) which engages over a ring-shaped rim (15) on the connecting sleeve, the outside diameter of the ring-shaped rim being adapted to the inside diameter of the holding flanges in such a way that the open hose clamp is prevented from pulling off the bush. <IMAGE>

Description

SPECIFICATION A device for connecting a hose end to a connecting sleeve The invention relates to a device for connecting a hose end to a connecting sleeve, with as an integral part of the connecting sleeve a bush for pushing on the hose end, with a hose clamp comprising at least two shell parts which surrounds the connecting sleeve, with a tension lever lock, the tension lever of which is linked to one shell part and the spring of which connects the tension lever to an adjacent shell part, and with an external ring-shaped rim on the connecting sleeve, wherein the shell parts are provided on their one side with inwardly projecting holding flanges which engage over the ring-shaped rim, and on their other side with clamping flanges which press the hose onto the bush.

With such a device until now the connecting sleeve and the hose clamp were connected by a holder extending in the radial direction, the one end of the holder engaging a hinge pin connecting the shell parts, and the other end being placed on the connecting sleeve next to the ring-shaped rim. To this end the holder is provided with a bore, so that it can be pushed over the bush up to the ringshaped rim. The securing on the side facing away from the ring-shaped rim takes place with the aid of a spring ring.

Since it is important to connect the hose clamp to the connecting sleeve in such a way that it cannot be detached, until now the technical effort involved has been endured.

However, this has made the manufacture and installation considerably more expensive.

It is proposed according to the invention that the outside diameter of the ring-shaped rim is adapted to the inside diameter of the holding flanges in such a way that, also when the tension lever lock is open, the hose clamp is prevented from pulling off the bush by means of the ring-shaped rim.

A radial holder as a connection between the connecting sleeve and hose clamp is now no longer required. Also when the tension lever lock is open, the shell parts, the tension lever and the spring form a closed ring. When according to the proposal of the invention the diameters are suitably adapted to one another, also this ring cannot be pulled off the connecting sleeve over the bush. In the opposite direction a pulling off is anyway not possible, since the connecting sleeve is generally provided, at its end facing away from the bush, with an external hexagon, the outside diameter of which at any rate forms the largest outside diameter of the connecting sleeve.

Whereas, therefore, until now the ringshaped rim solely served, together with the holding flanges, to prevent the hose end positioned on the bush and the hose clamp from pulling off, now the ring-shaped rim can ensure this function also when the hose clamp is open, provided that the ring formed by the shell parts and the open tension lever lock is closed. To keep this ring closed, the connection between the spring and shell part may under no circumstances be an easily detachable connection. Such a connection is known, for example, in the form of a hook formed by bending over the end of the spring and hooking it into a slot in the shell part. Within the framework of the invention a connection should be used which is difficult to loosen, but preferred is an undetachable connection.

According to a further proposal of the invention the latter can be produced in an advantageous manner in that the spring end engaging with the shell part is stuck from the outside through a slot in the shell part, and is dimensioned and shaped such that also when the tension lever lock is open it cannot get out of the slot.

This can be achieved, for example in that the spring end is made suitably long and is introduced into the slot before the other spring end is connected to the tension lever.

In that case, after producing the latter connection the overall length of the spring is too great to permit the spring from getting out of the slot.

In a further embodiment of the invention it is proposed that the inside diameter of the holding flanges is smaller than that of the clamping flanges.

This means that the holding flanges of the hose clamp extend radially particularly far inwards, so that the desired securing effect can also be obtained with a smaller outside diameter of the ring-shaped rim. A smaller outside diameter of the ring-shaped rim is advantageous, since as a result thereof the maximum outside diameter of the connecting sleeve can as a whole be reduced.

Generally, the bush of such a connecting sleeve is provided with a bead. The clamping flanges on the hose clamp must press the hose end onto the bush, if at all possible directly next to this bead. As a result thereof the hose is in a small section deflected from the axial into the radial direction and back again into the axial direction. This results, however, in a considerable improvement in the sealing effect. However, this is dependent on the clamping flanges of the hose clamp being positioned very accurately, seen in the axial direction.

Until now this positioning also had to be ensured with the aid of a holder extending in the radial direction.

However, according to a further proposal of the invention this can be achieved in a far simpler manner when the connecting sleeve is provided with an annular groove, which on its side facing the bush is delimited by the ringshaped rim, and when the groove width is dimensioned such that the holding flanges engaging in the annular groove, and accordingly also the hose clamp, are fixed in the axial direction.

Since now according to the invention the ring-shaped rim forms part of the annular groove, a fixing of the hose clamp in relation to the bush becomes possible in both axial directions. The axial position of the clamping flanges can accordingly be ensured with particularly great accuracy.

Since this measure can also be applied advantageously when a securing of the hose clamp in relation to the connecting sleeve does not take place by means of the ringshaped rim and the holding flanges, protection is claimed for this measure independent of the realisation of the features contained in claim 1.

Furthermore it is advantageous according to the invention when the groove wall opposite the ring-shaped rim is inclined towards the base of the groove and the ring-shaped rim.

As a result thereof the outer region of the annular groove is broader, facilitating the entering of the holding flanges into the annular groove.

in the following a preferred embodiment of the invention is described in greater detail with reference to a drawing. Shown are: Fig. 1 a cross-section through the device when the tension lever lock is closed; Fig. 2 a longitudinal section along the line ll-ll in Fig. 1; Fig. 3 another longitudinal section along the the line HI-Ill in Fig. 1; Fig. 4 a cross-section through the device when the tension lever lock is open.

A bush 11, forming part of a connecting sleeve 12, serves to push on a hose end 10.

At its end facing away from the bush 11 the connecting sleeve 12 has a threaded bore 13, into which a piping piece or another connecting part can be screwed. In this area the outer periphery of the connecting sleeve 12 forms a hexagon.

Between this area and the bush lithe connecting sleeve 12 has an annular groove 14, which on its side facing the bush 11 is delimited by a ring-shaped rim 15. Whereas the side wall of the annular groove 14 formed by this rim 15 lies in a radial plane, the opposite groove wall is inclined in such a way that the width of the groove decreases in the direction of the base of the groove.

The connecting sleeve 12 is surrounded by a hose clamp which is formed by two shell parts 16 and 17. The latter are connected at one end by means of a pivot pin 18, while at the opposite end a tension lever lock is provided. This consists of a tension lever 19 and a spring 20. The tension lever 19 is fastened to the shell part 17 by means of another pivot pin 21, whilst the one end of the spring 20 is connected to the tension lever 19 by a pivot pin 22. The shell part 16 has a slot 23 through which the other end of the spring 20 extends. This end is bent roughly into a Zshape. The spring 20 is dimensioned and shaped such that, when installing the device, it is first of all introduced with its bent end into the slot 23, and only then it is fastened to the tension lever 19 by means of the pivot pin 22.Then the ring formed by the shell parts 16 and 17, the tension lever 19 and the spring 20 can no longer be opened, provided that no undue force is applied.

The shell parts 16 and 17 are provided on one side with the clamping flanges 24 which, when the tension lever lock is closed, press the hose end 10 onto the bush 11. This pressing on takes place directly behind a bead 25 formed on the bush 11.

On the opposite side the shell parts 16 and 17 have holding flanges 26 which, when the tension lever lock is closed, engage in the annular groove 14. Since the ends of the shell parts 16 and 17 overlap in the region of the hinge pin 18, and the hose clamp has a relatively large axial dimension there, in this region contact will first of all be established against the inclined groove wall, which can be noted in particular from Fig. 3. However, the same also applies to the diametrically opposite region in which the tension lever 19 is fastened. In any case, during closing of the tension lever lock the holding flanges 26 are pressed in the direction of the ring-shaped rim 15 whilst they enter the annular groove 14.

This ensures accurate positioning of the clamping flanges 24 in relation to the bead 25.

The inside diameter of the holding flanges 26 is smaller than that of the clamping flanges 24. This permits a corresponding reduction of the outside diameter of the ringshaped rim 15. Nevertheless, due to the adaptation to one another of these diameters it is ensured that the holding flanges 26 also still engage behind the ring-shaped rim 15 when the tension lever lock is open, so that the hose clamp cannot be pulled off in the direction of the bush.

As can be noted from Fig. 1 and 2, the spring end stuck through the slot 23 in the shell part 16 can also be used for the following: when closing the tension lever 19 from the position shown in Fig. 4, in the course of this closing movement the spring end will come to rest or be pressed onto the hose end 10. Whereas until now the hose clamp could roughly turn freely in relation to the connecting sleeve 12, there now occurs friction between these parts which reduces the relative ability to turn. However, as a result thereof the closing of the tension lever 19 during the last part of the closing movement is facilitated, seeing that the hose clamp cannot turn around the connecting sleeve 12, or can only do so to a limited extent, so that it offers greater resistance to the closing movement of the tension lever 19.

Claims

1. A device for connecting a hose end to a connecting sleeve, with as an integral part of the connecting sleeve bush for pushing on the hose end, with a hose clamp consisting of at least two shell parts which surrounds the connecting sleeve, with a tension lever lock, the tension lever of which is linked to one shell part and the spring of which connects the tension lever to an adjacent shell part, and with an external ring-shaped rim on the connecting sleeve, wherein the shell parts are provided on their one side with inwardly projecting holding flanges which engage over the ring-shaped rim, and on their other side with clamping flanges which press the hose onto the bush, characterised in that the outside diameter of the ring-shaped rim is adapted to the inside diameter of the holding flanges in such a way that, when the tension lever lock is open, the hose clamp is prevented from pulling off the bush by means of the ringshaped rim.

2. A device according to claim I, characterised in that the spring end engaging with the shell part is located from the outside through a slot in the shell part and is dimensioned and shaped such that when the tension lever lock is open it cannot get out of the slot.

3. A device according to claim 1 or claim 2 characterised in that the inside diameter of the holding flanges is smaller than that of the clamping flanges.

4. A device for connecting a hose end to a connecting sleeve according to claim 1, 2 or 3, characterised in that the connecting sleeve is provided with an annular groove which, on its side facing the bush is delimited by the ring-shaped rim, and in that the groove width is dimensioned such that the holding flanges engaging in the annular groove, and accordingly also the hose clamp, are fixed in the axial direction.

5. A device according to claim 4, characterised in that the groove wall opposite the ringshaped rim is inclined towards the base of the groove and the ring-shaped rim.

6. A device according to any one of the foregoing claims, characterised in that a part of the spring extending through the associated shell part is pressed onto the hose end during closing movement of the tension lever.

7. A device for connecting a hose end to a connecting sleeve substantially as herein described with reference to the accompanying drawings.