LU80826A1 - FITTING FOR THE SEALED JOINT OF A PAIR OF CYLINDRICAL TUBES - Google Patents

Description

BL-2563 / EM / Vd '* —Γ 4 ÂRAND-DUCHË DE LUXEMBOURG ’

Patent N "............... Q ..... (J ...... (j. ^ 0 from .2,4 ..... Minister of the National Economy and the Middle Classes

Title issued: ........................................ _. . , _ ..., _. . .

Industrial Property Service

Μ ΤΤ ~. ) LUXEMBOURG

η ΙΛ, 'Μ w ^ ^ ^ Invention Patent Application <—I. Request

The so-called public limited company: MRHTA, B -....... WAASMUNSTER / ................................ ....... (1)

Belgium................................................. .................................................. .................................................. .................................................. ................................................

represented by M. Ernest MEYERS, ing.cons.en propr.ind ......................... (2> 46 rue du Cimetière, Luxembourg, acting as agent opposes________ this twenty-four January one thousand nine hundred and sixty - ^^ ~ born at --------------------- hours, at the Ministry of the Economy Nationale et des Classes Moyennes, in Luxembourg: 1. this request for obtaining a patent for invention concerning: * "Connection for the tight junction of a pair of tubes .......... ................... Φ "........... cylindrical ....." ........... .................................................. .................................................. .................................................. .........................................

declares, assuming responsibility for this declaration, that the inventor (s) is (are):

Jean LÆIKKECHT, avenue Adolphe Buyl 138, B - 1050 BRUSSELS ___________ (5) 2. the delegation of power, dated ....._________________ on _____ ÎQ19 3. the description in language ............ ............................... of the invention in two copies; 4 ............... § ............. drawing boards, in two copies; 5. the receipt of the taxes paid to the Registration Office in Luxembourg, on January 23, rail n & uf ccnt seventy-nine ..................... ..........................

claims for the above patent application the priority of one (s) request (s) of / / (6) ......................... ......... / ........................................ .................... filed (s) in (7) ................. ..... .................................................. .................................................. ......

the ................................................. ............. L .................................... ............................................... ... .................................................. .................................................. ........... (8) on behalf of ... ................. / ............ .................................................. .................................................. .................... .............................. .................................................. ............ (9) elect domicile for him / her and, if appointed, for their proxy, in Luxembourg ................. ......................

46 rue ~ cLu Craetière (10) requests the issue of a patent for the subject described and represented in the abovementioned appendices, - with postponement of this issue to _______months.

: * The ....... agent___i___ f \ II. Deposit Minutes

The above application for a patent for invention has been filed with the Ministry of National Economy and the Middle Classes, Industrial Property Service in Luxembourg, dated: January 24, 1979 qq ........ Pr. the Minister at 15 ... hours · "'of the National Economy !, of the Middle Classes,'" ·?; / "* -v; V \ v; 'Λ · ί% MV) c.>; i A "SOOT 1S" x :? '· * "E *' BL-2563 DESCRIPTIVE MEMORY filed in support of a PATENT OF INVENTION application in the name of the public limited company called" ΜΑΝΤΑ "for:" Connection for the tight junction of a pair of tubes cylindrical ".

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The present invention relates to a connector for the sealed connection of a pair of cylindrical tubes with a smooth external wall, by axial displacement of the connector with respect to the tubes, this connector comprising: - a socket which is placed on the ends of the tubes, - two annular seals made of elastic material, and - two sleeves mounted, each with axial displacement on one of the ends of the sleeve and having an annular rim projecting inwards, the sleeves being capable of occupying, when the fitting * is mounted on a pair of tubes to be connected, a first position corresponding to the maximum mutual spacing of the sleeves on the sleeve, position in which the uncompressed seals are located between one end of the sleeve and the annular rim of a sleeve, and a second position for complete mutual approximation of the sleeves on the socket in which the tubes are connected in a star manner. ehe, position in which the compressed seals are between one end of the sleeve and the annular rim of a sleeve.

An important object of the invention is to present a connector of this type which is quick and easy to assemble, without requiring skilled labor and which, while having these advantages, is perfectly sealed against high pressures.

: * For this purpose each joint has a transverse cross-section in firm form of h, the vertical branch of h being arranged against the corresponding end of the bush and the top, of this vertical branch projecting, in the deployed state of the joint , in a groove arranged in the internal peripheral wall of the sleeve corresponding to the distance from said flange.

/ '- 3 -

For the same purpose, according to another characteristic of the invention, the sleeves are mounted on the sleeve so as to be able to move in a translation parallel to the axis of the sleeve, means for direct fixing of the sleeves to the sleeve being planned.

An object of the invention is also to present a fitting of the above type which allows on the one hand the complete mutual approximation of the sleeves on the sleeve from their position of maximum mutual spacing following a simple axial translation of these sleeves on the socket and on the other hand a good retention of these sleeves in their position of mutual approximation without the need to use complicated accessories.

To this end, according to a first embodiment of the invention, the connector comprises an external sleeve screwed onto the two sleeves with threads of different directions.

For the same purpose, according to another embodiment of the invention, each sleeve comprises a series of elastic projections directed inwards and being in abutment against an external peripheral rib of the sleeve in position of maximum spacing of the sleeves , said rib being preceded in the direction of the center of the sleeve by a projection guide ramp which leads to a groove arranged in the sleeve for the reception of the projections in the position of complete approximation of the sleeves.

Still for the same purpose, according to yet another embodiment of the invention, the connector comprises a means of locking the sleeves with external flanges located near the center of the socket, these sleeves being * brought together by bolts and nuts, thus allowing compression of the joints.

Other details and particularities of the invention will emerge from the description given below, without limitation, of several embodiments of the invention, / * - 4 - with reference to the drawings, in which:

FIG. 1 represents a view in elevation and in half-section, of a connector according to the invention mounted on a pair of tubes, the connector being illustrated, in the upper part of the figure, in the initial state of assembly and at the bottom of the figure, in the state in which the assembly is finished.

2 shows a schematic view, in elevation, of a clamp which can be used for mounting the fitting according to Figure 1, the clamp being illustrated in the position of the fitting which corresponds to the position of mutual approximation complete with sleeves.

Figures 3 and 4 show partial views in elevation and in section, of fittings similar to that of Figure 1, but the sleeve locking means is produced each time in a different way, the left half of the corresponding figure to the position of mutual spacing of the sleeves and the right half to the position of mutual approximation of the sleeves.

Figure 5 is a view similar to that according to Figure 3, the connector comprising a seal of a different type and being illustrated in the initial state of assembly.

FIG. 6 shows an elevational view, partially in section, of a connector similar to that of FIG. 1, but the sleeve locking means of which is produced according to yet another alternative embodiment, the connector being illustrated, the upper part of the figure, in the initial state of the assembly and the lower part of the figure, in the state in which the assembly is finished.

FIG. 7 represents a partial view in section of a connector according to the invention, the connector being illustrated in the initial state of assembly.

Figure 8 is a view similar to that according to Figure 7, the connector comprising a seal of a different type.

FIG. 9 represents a partial sectional view j of another connector according to the invention, the connector being illustrated at the right part of the figure in the initial state of the assembly and at the left part of the figure at state in which assembly is complete.

FIG. 10 is an elevation view of a sleeve of the connector according to FIG. 9.

Figure 11 is a view along arrow XI of the "r, · Figure 10.

: .¾ Figure 12 shows a partial sectional view h of a connector according to the invention, the connector being illustrated in the initial state of assembly.

Figure 13 is a view similar to that according to Figure 12, the connector comprising a seal of a different type. Dan $ of the different figures the same numbers of iq'ji 'reference designate similar or equivalent elements.

^ As follows from FIG. 1, the connector according to ·, - the invention comprises a socket 1, a pair of annular seals 2 and a pair of sleeves 3.

The bushing 1 has an internal bore 4 dimensioned to accommodate the smooth ends slidingly, of a pair of cylindrical tubes with smooth external wall, 5, 6, which must be connected in a fluid-tight manner as the tubes 5, 6 are intended to transport. In the center, the sleeve has an internal bead 7 for centering.

Each of the sleeves 3 has an internal bore 8, dimensioned to allow the sleeve to slide over the sleeve 1 and it ends, on the side opposite the end directed towards the center of the sleeve 1, by an annular flange 9 directed towards the interior, dimensioned to bear, slidingly, against the external periphery of the corresponding tube 5,6. The peripheral wall of the internal bore 8 of each 'sleeve 3 has a receiving groove 10, in the position of maximum mutual spacing of the sleeves shown in the upper part of Figure 1, of a radial branch 11 that has the seal 2. The seals 1 # ·% * - 6 - are made of an elastic material such as rubber or similar material and they have an h-shaped cross section. Each of the seals 2 is oriented in such a way that the large branch 11 of the h is arranged against the end of the socket 1, that the small branch 12 of the seal is directed towards the rim 9 of the sleeve and that the bases 13 of the branches 11 and 12 surround the corresponding tube 5,6.

On the internal side, the annular rim 9 of each sleeve 3 is connected to the internal peripheral wall 8 by a ramp 14.

Finally, near its end which is directed towards the center of the socket 1, each of the sleeves 3 has an internal circular housing 15 for receiving a circlip 16 whose role will be explained below.

It should also be noted that the sleeve 1 has, at its ends, a reduction in external diameter which gives rise to the formation of a housing 17 between the internal peripheral wall 8 of each of the sleeves 3 and the sleeve.

The radial dimension of this housing 17 is less than the thickness of the branch 11 of the joint 2.

The fitting of the fittings described above is carried out as follows: the socket 1, the seals 2 and the sleeves 3 are preferably delivered in the form of a fitting forming a block, the elements 1, 2 and 3 being retained together in the mutual position shown in the upper part of Figure 1 by the circlips 16 abutting against the radial edge 18 that forms with the external peripheral wall of the sleeve 1 a gradual drop 19 arranged in said peripheral wall. The connector is fitted onto the ends of the tubes 5,6 to be joined until they abut against the bead 7 of the sleeve 1, which gives rise to no difficulty since the sleeve 1, the seals 2 and the rim 9 of the sleeves 3 slide freely on the tubes.

, Then we proceed to the mutual approximation of the sleeves 3 on the

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- »», - 7 - sleeve 1. During cgfaouvement, first of all the rear flank 20 of the groove 10 of the sleeves comes into contact with the branch 11 of the corresponding seal 2 and discharges it into the housing 17; the radial dimension of the housing 17 being less than the thickness of the branch 11 of the joint, the latter is compressed, as can be clearly seen in the lower part of FIG. 1. The movement of mutual approximation of the sleeves 3 then has for result that the ramp 14 of each sleeve progressively comes into contact with the small branch 12 of the corresponding seal 2 and presses it on the one hand, against the end of the sleeve 1 and, on the other hand, against the external periphery of the tube 5.6; in position of mutual coupling couplet of the sleeves, shown in the lower part of FIG. 1, the axial distance between each of the ends of the sleeve 1 and the internal flange 9, of each sleeve 3 is less than the thickness of the joint 2 in the deployed state, so that the seals 2 are compressed axially to a point such that their middle part is pushed back towards the tube by forming a fold 21 of additional sealing contact. In the position of complete mutual approximation of the sleeves, the circlips 16, after having crossed the slope 19 which put them under tension, relax, each in a respective circular notch 22, which has the external peripheral wall of the sleeve 1 and thus lock the sleeves 3 in their fully reconciled state.

To facilitate their sliding along the external periphery of the sleeve, the circlips 16 have a contact edge which is rounded.

* To carry out the mutual reconciliation of the sleeves, any tightening means is suitable; we have rg? shown schematically in Figure 2, by way of example, a clamp 24 which can be used for this purpose; each of the branches 25 of this clamp comprises a pair of pads 26 which are applied, on either side and S * / other of the tubes 5, 6, against the sleeve 3.

ß - 8 -

The means for locking the sleeves 3 in the position of maximum mutual approximation constituted by the circlips 16 can be achieved in many other ways. Figures 3 to 6 show some variants.

According to FIG. 3, the locking means is constituted by a series of pressure screws 27 which are placed in threaded channels 28, arranged at a distance from each other, through the peripheral wall of each of the sleeves 3, near their end facing the center of socket 1.

These pressure screws 27 are therefore located near * the ends of the sleeves 3 which face each other. These screws constitute means for direct attachment of the sleeves 3 to the socket 1 on which they bear.

It should be noted that also in the embodiment according to Figure 3, the sleeves 3 are mounted on the sleeve 1 so as to be able to move in a translation parallel to the axis of the sleeve 1 and therefore parallel to the axis of tubes 5 and 6.

According to FIG. 4, the locking means is constituted by a series of spring clips 29 in the general shape of a V, the branches of which are bent inwards at 30. On the one hand, the sleeve 1 has, along its periphery external a series of symmetrical elevations 31 provided with a central depression 32, receiving staples 29 and locating their top 33. On the other hand, each of the sleeves 3 ends on the side directed towards the center of the socket 1 , by a radial rim 34 for sliding on the external periphery of the sleeve 1. Inside, the radial rim 34 is extended by a ramp 35 which leads to an annular edge 36.

In the position of mutual spacing, the sleeves 3 are retained by the ends of the staples 29 engaged against h - 9 - the flanges 34. When the sleeves 3 are brought together, the staples 29 are pushed back elastic -inwardly by the ramps 35 until passing by the edges 36 of the ends 30 which, then, come out of the differences in level 31 and block the sleeves in their position of complete mutual approach, bearing against the respective annular edge 36.

An alternative embodiment would consist in having, each time, two half-staples instead of a staple 29, each half-staple having one end 30 and one end situated in the axis of symmetry of the staple 29; this second end could be folded back at a little more than 90 ° relative to the branch of the half-staple to hang on the corresponding side wall 37 of the central depression 32 of the socket 1.

The embodiment according to FIG. 5 differs from the embodiment according to FIG. 3 only in that the seals 2 have a circular cross section. These joints are therefore toroids.

According to Figure 6, the locking means is constituted by a series of spring clips 38 in general firm of C, fitted as bridges around the periphery of the gap 39 between the sleeves 3. For this purpose, a sleeves 3 has, externally, an annular groove 40 for clamping one of the ends of each clip 38 while the other sleeve 3 has, at its end which is directed towards the center of the sleeve 1, a flange 41 projecting outwards, behind which the other end of each clip 38 is hooked, in the position of maximum mutual separation of the sleeves 3. At a distance from the flange 41 the sleeve 3 has a circular groove 42 opening outwards, connected by a ramp 43 to the flange 41. When the sleeves 3 are brought close to each other on the socket 1 the staples 38 have their I end which moves along the ramp 43 and falls / »- 10 - finally in the groove 42, thus locking the sleeves 3 in the position of complete mutual rapprochement.

The connector according to FIG. 7 intended for the sealed junction of the cylindrical tubes 5 and 6 comprises a sleeve 1, a pair of annular seals 2, a pair of sleeves 3 and an outer sleeve 44. The external peripheral portions of the sleeves 3 are threaded and are capable of cooperating with threaded portions which have the internal periphery of the outer sleeve 44.

The threaded portions of the two sleeves 3 have a thread pitch of different direction and it is obvious that the thread pitch of each threaded portion of the internal periphery of the outer bush 44 corresponds to the thread pitch of the threaded portion of the sleeve with which this tapped portion cooperates.

To effect mutual reconciliation of the sleeves 3 and consequently the compression of the annular seals 2, it suffices to turn the outer sleeve 44.

In the embodiment according to FIG. 7, the seals 2 have an h-shaped cross section, as described in detail above for the embodiment according to FIG. 1.

The embodiment according to Figure 8 differs from the embodiment according to Figure 7 only in that the seals 2 have a circular cross section. These joints are therefore toroids.

The connector according to FIGS. 9 to 11, intended for the sealed junction of the cylindrical tubes 5 and 6, comprises a socket 1, a pair of annular seals 2 and a pair of sleeves 3. The seals 2, produced made of an elastic material such as rubber or the like, have a cross section in circular shape. Each seal 2 therefore constitutes a torus. The sleeves are also made of a material having a certain elasticity. Each sleeve 3 ends, on the opposite side to the end directed towards the center of the sleeve 1, by an annular flange 9 directed inwards and dimensioned to bear, against sliding, against the external periphery of the corresponding tube. 5.6. The parts of the sleeves 3 which are directed towards the center of the sleeve 1 and therefore towards the other sleeve have a series of grooves 45. On either side of each groove the sleeves are therefore provided with lips 46 whose ends form protrusions 47. As these lips 46 and these protrusions 47 are formed in the material of the sleeves 3, they are themselves elastic. The projections 47 are directed inwards and are in abutment against an external peripheral rib 48 of the sleeve 1 in the position of maximum separation of the sleeves 3.

The ribs 48 are preceded in the direction of the center of the sleeve by a guide ramp 49 of the projections 47. This guide ramp ends in a groove 50 which is arranged in the sleeve 1 for the reception of the projections 47 in the approaching position. complete with sleeves.

The sleeve 1, the seals 2 and the sleeves 3 are preferably delivered in the form of a block connection, the elements 1, 2 and 3 being retained together in the mutual position shown on the right side of Figure 3 by the projections 47 abutting against the outer peripheral rib 48 of the sleeve 1. During assembly the fitting is fitted on the ends of the tubes 5 and 6 to be joined until they abut against the inner bead 7 of the sleeve 1. Then we proceed to the mutual approximation of the sleeves> -ons 3 on 3a sleeve. During this movement the elastic seals 2 are compressed between the sleeve on the one hand and the sleeves 3 and their internal edges 9 on the other hand. The movement of bringing the sleeves 3 closer at the same time results in the projections 47 sliding on the guide ramps 49 to finally be placed in the groove 50 in the position of complete bringing together of the sleeves 3.

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It follows more particularly from Figures 9 to 11 that the locking of the sleeves 3 relative to the sleeve 1 is achieved without the use of additional parts such as an outer sleeve, circlips or staples.

It also follows from FIG. 9 that the seals can have a circular cross section.

In the embodiment according to FIG. 12, the parts of the sleeves 3 facing one another include external flanges 51 connected by bolts 52 and nuts 53. As the external flanges are provided on the parts of the sleeves which are directed towards each other, the bolts 52 may be short.

In the embodiment according to Figure 12 the seals are toroids and therefore have a cross section of circular shape.

The embodiment according to Figure 13 differs from the embodiment according to Figure 12 in that the seals have a firm cross-section of h.

It follows from the foregoing description that the invention relates to a connector for pipes, hoses and accessories for pipes, hoses or tubes, of all sizes and for a wide variety of uses.

In addition, the different embodiments have their specific advantages.

In the embodiments according to FIGS. 1, 3, 4, 6, 7 and 13, the assembly of two tubes or two tubular parts is carried out by the use of two annular seals the cross section of which is h . This particular shape (h) of the joints makes it possible to compress the latter between the walls of the tubes to be assembled and the three steel parts which have been described.

r Jl 'jr *> - 13 -: i

It is understood that in all embodiments the seals are made of elastic material of composition suitable for the use for which they are intended.

In all embodiments, the assemblies resist high pressure, they maintain the seal despite the shocks that can occur in service and they allow slight elongations of the overall tubular pipe in the event of impact or subsidence of the earth.

In all the embodiments, the sleeves only perform an axial translation which is not combined with a rotation around the geometric axis of the cylindrical tubes and of the connector.

. In all embodiments the sleeves comprise a fixing means and the seals are compressed between one end of the sleeve and an annular flange of the sleeve projecting inwards.

In the embodiments according to Figures 1 and 3 to 6, the above axial translation is imposed by a clamp.

In the embodiments according to FIGS. 7 and 8, the translation bringing the sleeves 3 closer together is imposed by the rotation of an outer sleeve 44, the sleeves 3 not participating in this rotation.

This socket blocks the sleeves 3 relative to each other when the latter have arrived in their position of complete mutual approximation.

The socket 44 of the embodiments according to FIGS. 7 and 8 consequently combines the role of the clamp 24 of FIG. 2 and the role of the locking elements, that is to say. circlips 16 of the following embodiment. Figure 1, pressure screws 27 of the embodiments according to Figures 3 and 5, spring clips 29 of the embodiment according to Figure 4 and staples! spring 38 of the embodiment according to FIG. 6.

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In the embodiment according to FIGS. 9 to 11, the reconciliation of the sleeves 3 can be achieved by any suitable means, for example by pliers, but the sleeves 3 are self-locking with respect to the sleeve by the combination of the projections 47 provided on the sleeves 3 and of the groove 50 presented by the sleeve 1.

In all these embodiments, the mounting of each assembly constituting the connector is almost instantaneous.

The embodiments according to Figures 12 and 13, are characterized in that the external flanges 51 against which bear the heads of the bolts 52 and the nuts 53 are at a small distance from each other, where in known fittings of the same kind these external flanges are located at opposite ends of the sleeves, which requires the use of much longer bolts and, therefore, less reliable as a means of attachment.

It goes without saying that the subject of this patent application is not limited to the modes of execution described above and that many modifications can be made to it, in particular as to the form, the number, the composition and at the disposal of the elements involved in its realization without departing from the scope of the patent.

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Claims (14)

2. Connection according to claim 1, characterized in that the sleeve has, at its ends, a reduction in external diameter which gives rise to the formation of a housing I between the internal periphery of the sleeve and the sleeve. - 16 - <[^ â 3. Connection according to the preceding claim, characterized in that the radial dimension of the housing is less than the thickness of the vertical branch of the h. 4. Connection according to either of the preceding claims, characterized in that the internal peripheral wall of each sleeve is connected to the internal wall of the internal annular rim of said sleeve by a ramp-shaped wall. 5. Fitting for the tight junction of a pair of cylindrical tubes with a smooth outer wall by axial displacement of the fitting relative to the pipes, this fitting comprising r - a socket which is placed on the ends of the pipes, - two seals annular in elastic material, and - two sleeves each mounted for axial displacement on one of the ends of the sleeve and having an annular rim projecting inwards, the sleeves being capable of occupying, when the fitting is mounted on a pair of tubes to be connected, a first position corresponding to the maximum mutual spacing of the sleeves on the sleeve, position in which the uncompressed joints are located between one end of the sleeve and the annular rim of a sleeve, and a second approximation position complete mutual sleeves on the sleeve, in which the tubes are tightly connected, position in which the compressed joints are located between one end of the d ear and the annular rim of a sleeve, characterized in that the sleeves are mounted on the sleeve so as to be able to move in a translation parallel to the axis of the sleeve, means for direct fixing of the sleeves to the sleeve being planned. /> __ W - *** Λ - 17 - * 6. Connection according to the preceding claim, I. \ characterized in that the fixing means are located at i. proximity of the ends of the facing sleeves. 7. Connection according to either of claims 5 and 6, characterized in that it comprises, for each sleeve, a circlip housed in a groove arranged in the sleeve and! which is in abutment against an external peripheral rib of the sleeve in the position of maximum spacing of the sleeves, said rib being preceded, in the direction of the center of the sleeve, by a guide ramp of the circlip which results in a groove arranged in the socket, for the reception of the circlip in position of complete approximation of the sleeves. 8. Connection according to either of claims 5 and 6, characterized in that it comprises pressure screws associated with tapped channels arranged in the peripheral wall of the sleeves, said pressure screws ending against the peripheral wall outside of the socket. 9. A connector according to either of claims 5 and 6, characterized in that it comprises a series of spring clips in the general shape of C each fitted on the periphery of the gap between the sleeves, in a first pair of elevations arranged in the external peripheral wall of the sleeves, in the position of maximum mutual spacing of the sleeves, one of the sleeves having, for each clip, a second elevation more distant from the face directed towards the other sleeve , that said first unevenness of said sleeve, second unevenness in which engages the corresponding end of the clip, in the position of complete approximation of the sleeves. ÎO. Connection according to either of claims 5 and 6, characterized in that it comprises spring clips in the general shape of a V, housed in symmetrical unevennesses that the external peripheral wall of. the socket, the branches of the staples having their ends / / 18. J which is curved inwardly to form surfaces for hooking respectively to a first pair of flanges presented by the sleeves, in the position of maximum separation i from the sleeves and to a second pair of flanges, more distant from the faces directed towards each other of the sleeves, that the flanges of said first pair of flanges, in the position of maximum approximation of the sleeves, the internal peripheral surface of each sleeve, between the fastening flanges of the staples, forming a ramp of slip for these, 11. Fitting according to claim 10, characterized in that each clip comprises two independent elements. 12. Connection for the tight connection of a pair of cylindrical tubes with a smooth external wall, by axial displacement of the connection with respect to the tubes, this connection comprising: - a sleeve which is placed on the ends of the tubes, - two seals annular sealing in elastic material, and - two sleeves mounted, each with axial displacement, on one of the ends of the sleeve and having an annular rim projecting inwards, the sleeves being capable of occupying, when the fitting is mounted on a pair of tubes to be connected, a first position corresponding to the maximum mutual spacing of the sleeves on the sleeve, position in which the uncompressed joints are located between one end of the sleeve and the annular rim of a sleeve, and a second position of complete reconciliation of the sleeves on the sleeve in which the tubes are tightly connected, position in which the compressed joints are located between one end / of the sleeve and the annular rim of a sleeve, Ί V / - 19 - · * characterized in that it comprises an external sleeve on the two sleeves with thread pitch of different direction. 13. Connection for the sealed connection of a pair of cylindrical tubes with a smooth external wall, by axial displacement of the connection with respect to the tubes, this connection comprising: - a socket which is placed on the ends of the tubes, - two seals d annular seal in elastic material, and - two sleeves mounted, each with axial displacement on one of the ends of the sleeve and having an annular rim projecting inwards, the sleeves being capable of occupying, when the connector is mounted on a pair of tubes to be connected, a first position corresponding to the maximum mutual spacing of the sleeves on the sleeve, position in which the uncompressed joints are located between one end of the sleeve and the annular rim of a sleeve, and a second position of complete mutual approximation of the sleeves on the sleeve in which the tubes are tightly connected, position in which the compressed joints are located between one end of the d ear and the annular rim of a sleeve, characterized in that each sleeve comprises a series of elastic projections directed inwards and being in abutment against an external peripheral rib of the sleeve in position of maximum separation of the sleeves, said rib being preceded in the direction of the center of the sleeve by a projection guide ramp which leads to a groove arranged in the sleeve for the reception of the projections in position this complete approximation J of the sleeves. . / - 20 - 14. Connection according to the preceding claim, characterized in that the raised projections are formed by the ends of the lips forming part of the sleeve and separated from each other by grooves renovated in the material of the sleeve. 15. Connection for the tight connection of a pair of cylindrical tubes with an external wall 1ίε = 5, by axial displacement of the connection with respect to the tubes, this connection comprising: - a socket which is placed on the ends of the tubes, - two seals sealing rings on elastic material, and - two sleeves mounted, each with axial displacement on one of the ends of the sleeve and having an annular rim projecting inwards, the sleeves being capable of occupying, when the fitting is mounted on a pair of tubes to be connected, a first position corresponding to the maximum mutual spacing of the sleeves on the sleeve, position in which the uncompressed seals are located between one end of the sleeve and the annular twist of a sleeve, and a second position of bringing the sleeves closer to each other on the sleeve in which the tubes are tightly connected, position in which the compressed joints are located between one end of the dou ille and the annular rim of a sleeve, characterized in that it comprises a means of locking the sleeves with external edges located near the center of the sleeve, these sleeves being brought together by bolts and nuts, thus allowing the ccrtression of joints. 16. Connection for the tight junction of a pair of cylindrical tubes as described above or shown in the accompanying drawings. '_____ .. /, ’t