MXPA00008378A - Snap-on connection for fluid conduit - Google Patents

Abstract

The invention concerns a snap-on connection for a fluid conduit, particularly for motor vehicle, comprising a cylindrical shell (114) mounted fixed on one end of the conduit (10) to be connected on a tubular connection piece (12) designed to be inserted in the shell (114) and comprising a peripheral projection (20) in the proximity of its free end, and a cylindrical locking member (124) directly mounted around the shell (114) and designed to co-operate with part of the shell (114) and with the connection piece peripheral projection (20) for maintaining the connection piece (12) engaged in the shell (114). The invention is characterised in that the locking member (124) comprises at least a longitudinal slot (136) and is formed with two lateral brackets arranged respectively on either side of said slot (136) to enable, by pushing on the brackets (142a, 142b) in two opposite directions, to open the locking member (124) for disconnecting the conduit (10) and the connection piece (12). The invention is particularly applicable to conduits of fluid under relatively high pressure for motor vehicles.

Description

COUPLING BY RATCHET OF A FLUID DUCT The present invention relates to the improvement of a ratchet coupling for a fluid conduit, in particular for automotive vehicles, the coupling being intended, in particular, for conduits through which fluid passes under relatively high pressure, such as, for example, the ducts of an air conditioning circuit. Very often, duct couplings of this type comprise a metal bushing which is fixed - for example, by a rim - at the end of the duct, and which is intended to be locked in the tubular end piece of a circuit element mentioned above, The cap ensures that the conduit and the endpiece maintain a hermetic seal before the passage of the fluid. A cylindrical securing member surrounds the ferrule and the ferrule, and cooperates with them by producing a catch or a ratchet coupling, or both at the same time, to oppose the separation of those parts and to maintain the connection between the conduit and the conduit. tip. That type of coupling must be reliable, while being as simple and as inexpensive as possible. It is also required or desired to be easy and quick to assemble, and to allow the conduit and the ferrule to be disconnected by means of a rapid movement that can be carried out with one hand, without the help of tools. A particular object of the present invention is to satisfy this need, by means of a ratchet coupling which complies with the aforementioned conditions. For this purpose, the present invention provides a coupling consisting of a cylindrical bushing secured to one end of a conduit, to make the coupling to a tubular end piece which is designed to be inserted into the bushing and having a projection peripheral in the vicinity of its free end, and a cylindrical securing member around the ferrule and designed to cooperate with a part of the ferrule and with the peripheral projection on the ferrule, to keep the ferrule hooked in the ferrule, the coupling characterized in that the securing member has at least one longitudinal groove and is formed by two lateral legs arranged on respective opposite sides of said groove, to allow the securing member to open it to disconnect the conduit from the ferrule. a push in two opposite directions on the legs. The longitudinal groove of the securing member makes it possible, first of all, to mount it easily on the bushing or on the ferrule and, secondly, to open it with just one hand, when it is desired to disconnect the conduit the end. In a practical embodiment of the securing member, the aforementioned lateral legs are formed at one end of the securing member and are adjacent to each other. In another practical embodiment of the present invention, the securing member consists of two diametrically opposed longitudinal grooves, and the two lateral legs mentioned above are diametrically opposed and are located on respective sides of an axial plane passing through both grooves. In both cases it is sufficient to use two fingers to apply torsional moment on the two lateral legs, in order to open the securing member and allow the conduit and the end piece to be disconnected. The securing member can be manufactured as a single piece or it can be manufactured as two semi-cylindrical parts that engage each other and fit together or in the aforementioned bushing, or do both at the same time, by elastic adjustment or coupling by ratchet. The securing member can be manufactured with plastic or metal materials. Preferably, it is mounted on the bushing and -. cooperates with the end piece by ratchet coupling. In general, the part of the bushing with which the securing member cooperates is constituted by at least one shoulder or peripheral retallousness of the bushing, in a first practical embodiment of the coupling, or, at least one projection located on the periphery of the bushing and directed towards the end of the ferrule, which is adjacent to the tubular ferrule in a second peripheral embodiment of the present invention. This second practical embodiment has the advantage of avoiding the sharp angle needed to manufacture the shoulder in the bushing, and makes it possible to reduce the axial length of the securing member. The present invention will be better understood, and other features, details and advantages will become more evident when the following description is read, which is given as an example and is made with reference to the accompanying drawings, in which which: Figures 1 and 2 are a side view and a plan view, respectively, of a coupling constituting a first practical embodiment of the present invention; Figure 3 is an axial sectional view taken along the line III-III of Figure 2; Figure 4 is an axial sectional view taken along the line IV-IV of Figure 3; Figure 5 is an axial sectional view of a variant of the first practical embodiment of the coupling object of the present invention. Figure 6 is a schematic perspective view of the securing member of the couplings shown in Figures 1 to 5; Figures 7 and 8 are schematic perspective views of two variants of practical embodiment of said securing member; Figure 9 is a schematic perspective view, showing a portion of the securing member of Figure 8 mounted in place on a coupling; Figure 10 is a schematic perspective view, showing the two parts of the securing member of Figure 8 mounted in place on a coupling; Figure 11 is an axial sectional view of a second practical embodiment of a coupling object of the present invention; Figure 12 is a perspective view of the axis of the bushing of the coupling of Figure 11; Figure 13 is an axial sectional view of the cap-device subassembly subassembly of the coupling of Figure 11; fa.

Figures 14 and 15 are perspective views of two pieces forming the coupling securing member of Figure 11; Figure 16 is a perspective view of the coupling of Figure 11; Figures 17 and 18 are, respectively, views of the one-piece variant of the coupling member of Figures 14 and 15; Figures 19 and 20 are perspective views of another one-piece variant of the securing member of Figures 14 and 15; Figure 21 is a partial perspective view of the coupling of Figure 11, comprising the securing member of Figures 19 and 20; Figure 22 is a partial perspective view of the coupling of Figure 11, with another variant of the securing member of Figures 18 and 19; Figures 23 and 24 represent, schematically and partially, possible variants of the bushing belonging to the coupling of Figure 11; and Figure 25 is a perspective view to illustrate another practical embodiment of the securing member; Figure 26 is an axial sectional view of the bushing and the securing member of Figure 25, once the said two elements were coupled together; Figures 27 and 28 are perspective views to illustrate yet another practical embodiment of the bushing and the securing member, respectively; and Figure 29 is an axial sectional view of the bushing and the securing member of Figures 27 and 28, once the said two elements were coupled together. First, reference is made to Figures 1 to 4, which represent a first embodiment of a coupling object of the present invention, designed to connect a conduit 10 to a tubular end 12, both elements consisting of rigid tubes - for example, metallic-for the circulation of a fluid under relatively high pressure, as, for example, in an air conditioning circuit of a motor vehicle. The coupling object of the present invention comprises a metal cap 14 of cylindrical shape in general, which is pressed on the end of the conduit 10, the bushing being formed by a ring 16 projecting outwards, acting as a support stop and put into position for one end of the bushing 14. The other end of the bushing 14 extends beyond the end of the conduit 10, and comprises a seal 18 for sealing which is molded on the face -, »-. ^ * - »- * * - 'a ^ & ^ J = t * inside the bushing. The endpiece 12 has an outwardly projecting ring 20, the outside diameter of which is slightly smaller than the inside of the free end of the bushing 14, in the practical embodiment shown, the ring 20 being at a distance from the free end of the end piece. 12, so that said free end can be inserted, not only inside the bushing 14 but also inside the enlarged free end 22 of the conduit 10, as shown in Figures 3 and 4, when the ring 20 is inside the bushing 14. In this position, the impermeability to the passage of the fluid is guaranteed by the gasket 18 for hermetic sealing of the bushing 14, which is applied against the external peripheral surface of the endpiece 12, the internal cylindrical surface of the gasket 18 being able to be formed, in a conventional manner, with ribs or annular lips for hermetic closure, which form, on the end of the endpiece 12, a plurality of successive lines for hermetic sealing. In the connection position shown in the Figures 3 and 4, the end 12 guides the enlarged part 22 of the conduit 10 and the free end of the bushing 14, in which the peripheral ring 20 of the endpiece 12 is received, thereby avoiding any transverse movement of the 12 inside the bushing 14 and the conduit 10.

J The coupling object of the present invention also comprises a securing member 24 surrounding the bushing 14 and the endpiece 12, and which is mounted on the bushing 14 with little play in the translation in the axial direction and in the rotation about the longitudinal axis 26 having in common, one end 28 of the member 24 resting on a peripheral stop 30 of the bushing 14, in the direction preventing the member 24 from moving towards the endpiece 12, the other end 32 of the member 24 of securing having a shape such that it allows it to be hooked by elastic ratchet, behind the peripheral ring 20 of the endpiece 12, as shown in Figure 3. This end 32 has a cylindrical annular shape and its internal peripheral edge 34 extends, in the direction radial, towards the axis 26 in at least two diametrically opposed points of the periphery of that axis, so as to form elastic legs for elastic ratchet, to which the ring 20 radially outwardly, when the endpiece 12 is inserted into the bushing 14 and the conduit 10, and that they return to their initial securing position by pressing against the ring 20, as soon as it engages in the bushing 14 and released the said legs. In this position (as shown in Figure 3), the connection between the conduit 10 and the ferrule 12 is positively maintained by the securing member 24. This member has at least one and, preferably, two grooves. 36 diametrically opposite longitudinals, extending over the largest part of the length of that securing member, between its end 32 projecting beyond the bushing 14 and the vicinity of its opposite end 28, one of the two slots being able to extend over the entire length of the securing member 24, so as to allow it to be opened by elastic deformation, thereby facilitating its assembly on the bushing 14. Two side legs 38 are formed on the securing member 24, on each side of said longitudinal slot 36, in the vicinity of the end 32. These side legs extend radially, with respect to the longitudinal axis of the member 24, and are offset from each other along the said axis, while remaining adjacent or sensibly adjacent. By pushing the two legs 38 in two opposite directions, as shown by the arrows in Figure 6, which can be done with the index and thumb fingers without the need for a special tool, it is possible to open the end 32 of the member sufficiently. 24 for securing the ring 20, on the end piece 12, the legs 34 for fixing the spring, in order to disconnect the endpiece 10 from the endpiece.

In the variant shown in the axial section of Figure 5, the securing member 24 is identical to that of Figures 1 to 4 and 6, while the bushing 14 differs, from that shown in Figures 1 to 4. , in that it has a gasket 40 for sealing which is molded on the inside of its end that surrounds the conduit 10. This provides two seals, one between the bushing 14 of the conduit 10, and the other between the bushing 14 and the ferrule 12. The two legs 38 are substantially in the same plane, in the practical embodiment of Figures 1 to 6. In one variant they can be in different planes. In these circumstances, member 24 can be unlocked, either bringing the two legs 38 together, or, on the contrary, moving one away from the other. The securing member 24, which is manufactured as a single piece in the practical embodiment shown in Figures 1 to 6, can be fabricated as two semi-cylindrical parts 42, as shown schematically in Figure 7. Preferably, the two parts 47 are identical and comprise means for fixing one to the other by hooking or by elastic ratchet. For this purpose, the semi-annular end 44 of each piece 42, located at the end of the conduit, extends by a leg 46, on one of the sides, and has a cover 48, on the other side, to receive the paw 44 belonging to the other part 42. The end of each piece 42 located at the end of the end piece is semi-annular in shape and has an inner edge 48 extending inwardly, to form an elastic ratchet leg against the collar 20 of the end piece 12. In the assembly it is sufficient to place the two pieces 42 on each side of the sleeve 14 and insert the legs 46 into the corresponding covers 48, whereby the two pieces 42 are connected and the securing member 24 is formed. form with a side leg 38 of the above specified type, such that, when armed, the securing member 24 has two side legs 38 which are diametrically opposed. It is still possible to exert a torsional moment with the index and thumb on the two legs 38, to open said end of the securing member 24 and, thereby, allow the conduit 10 to be disconnected from the endpiece 12. In the embodiment variant practice, which is shown in Figure 8, the securing member 24 is made of two identical parts 52 that have the same characteristics as the parts 42 of Figure 7, and each is semi-cylindrical in its entire length, but without openings between the ends. In addition, the adjusting legs with elastic ratchet or fixation 54 and 56 are formed in respective ends 58 and 60 of the parts 52, each of which also has a side leg 38, of the type specified above, at the end 62 located adjacent to the endpiece 12. The parts 52 are mounted on a bushing 14, of the As shown schematically, in Figures 9 and 10. In Figure 9, a part 52 (below) was mounted on the bushing 14 already tightened on the end of the conduit 10, while another part 52 (above ) is located above the bushing 14, ready to be mounted on the bushing and on the part 52 below. The leg 54 (back) of the part 52 below surrounds the cylindrical part (back) of the bushing 14 leaving some play, while the other clamp leg 56, of the aforementioned part 52 below, is tightened in a manner elastic against the cylindrical part of the other (anterior) end of the bushing 14. When the top part 52 is placed on the bushing 14, as shown in Figure 10, its front end 60 covers the fixing leg 56 of the part 52 below, while the rear end 58 of the top piece 52 is engaged between the bushing 14 and the leg A "fastening 54 of the bottom piece 52, and retained by said elastic leg 54. In this position of Figure 10, the securing member 44 is mounted and fixed on the bushing 14, and is ready to be locked, by adjustment of elastic ratchet, on a ferrule 12 that is inside the ferrule 14, and inside the end of the conduit 10. As before, the torsional moment generated by means of the index and the thumb on the lateral legs 38 allows the front end of the securing member 24 to be operated to disconnect the conduit 10 from 12. A particularly important advantage of the coupling object of the present invention, is that the securing member 24 is not prevented from rotating on the bushing 14 and the endpiece 12, and it can be displaced at will to the interior of the most suitable angular position around its longitudinal axis, so that it can be operated. The securing member 24 can be made of any suitable material, in particular a plastic or metal material. Although it is mounted on the cap 14 in the practical embodiment that is preferred for the present invention, it could also be mounted on the tip 12, so that it is secured by elastic ratchet on the sleeve 14. Reference is now made to Figures 11 to 16, which show a second embodiment practice of the coupling object of the present invention. In comparison with the first practical embodiment, the coupling has improvements relative to the bushing 114, the sealing device 118 and the securing member 124. In general, the member 124 is fitted over the bushing 114 by the elastic deformation of the said member 124. , and arming means are provided between the bushing 114 and the securing member 124, for securing the securing member on the bushing 114. The metal bushing 114 still has a cylindrical shape in general and is tightened about the end of the conduit 10, the ring 16 that is on the conduit 10 acting as support stop and put into position for bushing 114 (Figure 11). On the other hand, towards the free end of the bushing 114, which extends beyond the end of the conduit 10, there is provided, at least one projection 130 that leaves the peripheral surface of the bushing 114, which is intended to cooperate with the securing member. 124, in the manner explained below. The bushing 114 has four projections 130, which are diametrically opposed in pairs (Figure 12).

¿G & üj 1 The sealing device 118 (Figures 11 and 13) is constituted by a cylindrical joint 132 to which extends, in an axial direction to one of the ends, a cylindrical protective insert 134. Advantageously, the joint 132 is secured to the insert 134 so as to form a single piece with it. This connection can be ensured by adhesion or by mechanical gripping means having complementary shapes. The seal 132 is made with an elastomeric material, while the protective insert 134 can be made with metal or plastic material. The sealing device 118 is housed in the bushing 114, by the initial insertion of the gasket 132. The bushing 114 has a reduction in its diameter, in order to define an internal annular shoulder 135, which forms a stop for the gasket 132. The free end of the protective insert 134 has an outer flange 138 which presses against the end surface of the bushing 114, when the gasket 132 is pressed against the shoulder 135. Thereafter, the bushing 114 is fixed to the bushing 114. press on the duct 10, as in the first practical embodiment, before it is mounted on the endpiece 12. It is important to note that the operation makes it possible, in a single operation, to fix the sleeve 114 on the duct 10 , to secure the seal 132 axially, and to provide a hermetic seal between the saj-bushing 114 and conduit 10. The securing member 124 is fabricated as two parts 140a and 140b, to which is shown in Figures 14 and 15, respectively. The first part 140a is generally semi-cylindrical in shape, about an axis X-X, and has a curved wall 141a, from which it can be divided into three zones: a cross-sectional area of end Xa, which extends between a leg side 142a folded outwardly and longitudinal side 144a; - a central transverse area Ya, which extends between a longitudinal side 146a and another longitudinal side 148a; a curved tongue 150a extending through the central area Ya, from the middle part of the longitudinal side 148a; and a transverse end region Za, which extends between two longitudinal sides 152a. The free end of the end transverse area Za is bent inward, between the two longitudinal sides 152a, to form a leg 155a for closure by elastic adjustment. Through the curved wall 141a an opening 157a is made, at a level situated between its central area Ya and its end zone Za, the said opening 157a having complementary shape to the projections 130 emerging from the 1 .. > cap 114. The opening 157a of the first part 140 is substantially located at 90 ° with respect to the side leg 142a, and the elastic ratchet leg 155a is located at substantially the same level as the opening 157a. In this way, the opening 157a of the securing member 124 and a projection 130 of the bushing 114 constitute reinforcing means having a complementary shape, for securing the securing member 124 on the bushing 114. The second part 140B of the securing member 124 is , in general, similar, in terms of total shape, to the first part 140a, and the same reference numbers are retained, replacing a by b_. In any case, the difference lies in the fact that the position of the side leg 142b and the tongue 150b is inverted; that is to say: the lateral grasping leg 142b is located in the central transverse area Yb; and the tongue 150b is located in the extreme transverse region Xb. The securing member 124 is engaged in place by elastic deformation around the bushing 114. The first part 140a is located on the bushing 114, such that one of the four projections 130 of the bushing 114 engages the bushing 114. opening 157a of the first part 140a: in this way it is prevented that this part moves in the axial or rotation direction. Then, the second part 140b is placed in such a way that the projection 130 of the bushing 114, which is far from the projection that was already hooked in the opening 157a of the first part 140a, in turn is hooked in the opening 157b of the second part 140b, as long as once these positions have been reached: the two parts 140a and 140b are diametrically opposed to one another and, together, surround the bushing 114; - the two legs for elastic ratchet 155a and 155b define, between them, two notches 158, in which the third and fourth projections 130 coming out of the bushing 114 fit; - the zones Xa, Ya and Za of the wall 142a of the piece 140a are facing, respectively, the zones Xb, Yb and Zb of the wall 142b of the piece 140b; the two side legs 142a and 142b are substantially located in the same plane, with a slot 136 therebetween; - the side leg 142a of the piece 140a covers the longitudinal side 146b of the piece 140b and, reciprocally, the free end of the tongue 150b of the piece 140b is facing the longitudinal side 144a of the piece 140a. Once the coupling is mounted on the conduit 10, the end piece 12 can be hooked on the bushing 114, until the two legs 155a and 155b engage, by elastic ratchet coupling, behind the peripheral ring 20 that is on the tip 12, as shown in Figures 11 and 16. In a variant of this second practical embodiment, the securing member 124 is constituted as a single piece having at least one longitudinal slot to allow the securing member 124 to deform elastically while it is being mounted on the bushing 114 and, also, while being introducing the endpiece 12. In Figures 17 and 18 there is shown an assurance member 124 formed by a single piece and generally cylindrical in shape: in comparison with Figures 14 and 15, now the two walls 141a and 141b are joined, maintaining a longitudinal groove 136 which is in level with the side legs 142a and 142b. The securing member 124 has two transverse openings 157a and 157b, diametrically opposed and which were designed to receive two projections 130 on the bushing 114. The two openings 157a and 157b are substantially located at 90 °, with respect to the side legs 142a and 142b, as in the example illustrated in Figures 14 and 15. Towards one end, the securing member 124 also has two legs 155a^^ t ^^^^^^ atíéj ^^^^ É ^^^^^ and ^ i ^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^ and 155b for elastic ratchet and diametrically opposite, to cooperate with the peripheral ring 20 that is on the end 12. These two legs are sensibly located at the same level as the openings 157a and 157b. Remote from the side legs 142a and 142b it is advantageous to provide at least one transverse groove 136b, so as to increase the elasticity of the securing member 124 (Figure 18). The slot 136a is diametrically opposite to that of the side legs 142a and 142b and, advantageously, receives a projection 130 of the bushing 114, to prevent the securing member 124 from moving, and to make it easier opening. In the case where the bushing 114 has four projections 130 distributed in a regular manner around its periphery, two diametrically opposed projections 130 are intended to be received by the two openings 157a and 157b; a third projection 130 is intended to be received by the slot 136, and the fourth projection 130 is intended to receive a notch 158, which is defined between the two legs for elastic ratchet 155a and 155b, on the side remote from the two side legs 142a and 142b. The securing member shown in Figures 19 and 20 is also made in one piece, but is intended to cooperate with a bushing 114 having only two diametrically opposed peripheral projections 130. In this case, the walls 141a and 141b of the securing member 124 do not have the openings 157a and 157b. The two projections 130 are located between the notches 158 that are defined between the two legs 155a and 155b, as shown in Figure 21. Up to now, the two legs of the securing member 124 were intended to be manipulate by hand, so as to open them in two opposite directions in order to release the end 12. For this purpose, the legs are sensibly folded at 90 °, in order to make them easier to handle. In a variant, the legs could also be manipulated by means of a tool, of the type of the clamp used to manipulate rings of open elastic perimeter. An example is given in Figure 22, in which two side legs 142a and 142b are folded at an angle of 180 °, and each of them has a central hole 160 in which the respective arm of the clip can be hooked. From the second practical embodiment described above, it is possible to envisage variants that refer to various parts of the coupling. The projections 130 provided on the bushing 114 can be made on the tubular insert 134 of the securing device 118. For this, it is sufficient to arrange the external rim 138 of the rim 134.

^ ^ ^ * In the corresponding manner, as schematically shown in Figure 23. In general terms, the projections 130 that are on the bushing 114, or the insert 134 related to the gasket 132, are manufactured in the form of a rim that It has two lateral sides that form a living angle with the peripheral surface of the bushing 114. An angle can be formed by giving it, on one of the sides of the projection 130, the shape of a ramp, in order to make the coupling easier. . An example is represented schematically in Figure 24, in the case of the bushing 114 with two projections 130, it being understood that the two ramps 130a are symmetrical with each other, with respect to a point located on the bushing axis 114. FIGS. 26 illustrate another practical embodiment of a single piece for the securing member 124, with different arming means for immobilizing said member on the bushing 114. The securing member 124 has a cylindrical part 160 with a longitudinal slot 136 that allows it to deform elastic way The cylindrical part extends axially and on one side, in the form of two diametrically opposed end portions 162a and 162b. Each end portion 162a, 162b forms a semicircular ring 164a, which extends radially outwardly, defining a semicircular internal groove 166a, 166b, and then folds inwardly to form an elastic pawl leg 155a, 155b, as in previous practical achievements. When the securing member 124 is armed around the bushing 114, the projection 130 of the bushing 114, such as the shape of a ferrule at the end of the bushing, is received by the notches 166a, 166b of the securing member 124, so as to keep in place. It will be noted that the two legs 142a and 142b of the securing member 124 are defined by two notches 170 located on each side of the slot 136. Figures 27 to 29 illustrate a final practical embodiment with a one-piece securing member 124, with arming means having a reverse structure, ie, that the projections 130 are provided at the level of the securing member 124, while the corresponding openings are provided in the bushing 114. Expressed more precisely, the bushing 114 presents, for example, two diametrically opposed openings 170a, 170b (Figure 27) and the securing member 124 has legs 172a, 172b folded inwardly and formed in the free ends of said securing member 124, which are located between the two legs for -4 elastic adjustment 155a and 155b (Figure 28), to engage in the openings 170a, 170b of the bushing 114 (Figure 29). -aM-i-i-fc-a-watoa, ^ é ^ ff. ^ * »J

Claims (23)

1. A ratchet coupling for a fluid conduit, in particular for automotive vehicles, comprising the coupling of a cylindrical bushing (14, 114) secured to one end of a conduit (10), to make the coupling to a tubular ferrule ( 12) which is designed to be inserted into the bushing (14, 114) and having a peripheral projection (20) in the vicinity of its free end, and a cylindrical securing member (24, 124) fitted around the bushing (114) and designed to cooperate with a part of the bushing (114) and with the peripheral projection (20) that is on the end piece, to keep the endpiece (12) engaged in the bushing (114), characterized in the coupling because the member (24, 124) has at least one longitudinal groove (36, 136) and is formed by two side legs (38, 142a, 142b) organized on respective opposite sides of said groove (36, 136), to allow to the insurer member or (14, 124) is opened to disconnect the conduit (10) from the ferrule (12) by applying a thrust in two opposite directions on the legs (38, 142a, 142b).

2. A device according to claim 1, characterized in that the side legs (38) are formed in the F ^ s ^ i ^^ neighborhood of one end of the securing member (24, 1249). A device according to claim 1 or 2, characterized in that the side legs (38) are adjacent to each other. 4. A device according to any one of the preceding claims, characterized in that the securing member (24, 124) is as one piece. A device according to claim 1 or 2, characterized in that the securing member (24) is manufactured as two semi-cylindrical parts (42, 52) which are fixed to each other or on the aforementioned bushing (14), by means of elastic adjustment or by ratchet. 6. A device according to claim 5, characterized in that the two semi-cylindrical parts (42, 52) are identical to each other. 7. A device according to claim 6, characterized in that each semicircular part (52) has two legs (54, 56), for the elastic assembly on the bushing (14) or the end piece (12), and on the other half-cylindrical part ( 52), respectively. A device according to claim 1 or 2, characterized in that the securing member (24) comprises, at least one of its ends, of a cylindrical part whose inner edge (34) extends radially towards the axis of the securing member in, at least two, points of the periphery thereof, to form securing legs. A device according to any one of the preceding claims, characterized in that the securing member is mounted on the bushing (14) and cooperates; by elastic ratchet, with the radial projection (20) of the ferrule (12). A device according to any one of the preceding claims, characterized in that the securing member (24) is made of plastic or metal material. A device according to any one of claims 1 to 3, characterized in that the part of the bushing (114) that cooperates with the securing member (124) is constituted by reinforcing means in a complementary manner, for retaining the securing member ( 124) on the bushing (114). A device according to claim 11, characterized in that the assembly means consist of, at least one, projection (130) towards the free end of the bushing 114, and in that the securing member (124), at least one, aperture ( 157a) or notch (158), into which the projection (130) of the bushing engages. A device according to claim 12, characterized in that the securing member (124) consists of two pieces (124a, 124b) fitted around the bushing (114), each piece (124a, 124b) having at least one opening ( 157th, 157b) in which a peripheral projection (130) of the bushing (114) is to be hooked. A device according to claim 13, characterized in that each of the two pieces (124a, 124b) of the securing member (124) comprises a leg for elastic adjustment (155a, 155b) intended to be held by elastic ratchet on the projection peripheral (20) of the endpiece (12), those two said legs being in diametrically opposite position. A device according to claim 12, characterized in that the securing member (124) is formed by a single piece which, in general, has a cylindrical shape and has a longitudinal groove (136) with two side legs (142a, 142b) in each side of the groove (136), and towards one end has two legs for adjustment by elastic ratchet (155a, 155b), in diametrically opposite position, intended to be elastically closed on the peripheral projection (20) of the tip (12). 16. A device according to claim 15, characterized in that the securing member (124) has at least one opening (157a, 157b), in which the peripheral projection (130) of the bushing (114) is to engage.17. A device according to claim 16, characterized in that the bushing (114) has four projections (130) distributed in a regular manner around the periphery of that bushing, and characterized in that the The securing member (124) has two diametrically opposed openings (157a, 157b), in which two peripheral projections (130) engage, and characterized in that the two engaging legs (155a, 155b) define, between them, two notches (158). ) in which the other two peripheral projections (130) of the bushing (114) engage. 18. A device according to claim 16, characterized in that the bushing (114) has four projections (130) spaced in a regular manner on its periphery, characterized in that the securing member 15 (124) has two diametrically opposed openings (157a, 157b) in which two peripheral projections engage (130); a third opening (136a), in which a third peripheral projection engages; and characterized in that the two engaging legs (155a, 155b) define, between them, a 20 notch (158) in which the fourth peripheral projection (130) of the bushing (114) engages. 19. A device according to claim 16, characterized in that the bushing (114) has two diametrically opposed projections (130); and characterized 25 because the two engaging legs (155a, 155b) define, between ^ & ^^^^^^^ ¡^ j & amp; amp; > & ^^^^^^^^^^^^^^^^^^^^ them, two diametrically opposite notches (158) in which the two peripheral projections (130) of the bushing (114) are hooked . A device according to claim 15, characterized in that the securing member (124) comprises a cylindrical part (160) with a longitudinal groove (136); in that the cylindrical part (160) extends axially and from one of the sides, in the form of two diametrically opposed end portions (162a, 162b); because each end part (162a, 162b) forms a semicircular ring (164a, 164b) extending radially outwards defining a semicircular internal groove (166a, 166b) and folding inward to form a pawl for ratchet (155a, 155b), and in that the bushing (114) has a projection (130) in the form of a ferrule for engaging in said notches (166a, 166b). A device according to claim 1 or 2, characterized in that the assembly means consist of, at least one, projection (172a, 172b), formed by a folded leg, inwardly, of the securing member (124) and, when minus one, opening (170a, 170b) of the bushing (114). 22. A device according to any of claims 11 to 21, characterized in that it consists of a device for sealing (118) housed inside the bushing (114), said device (118) consisting of, ** - • - - * •• -k-a-a? -k- > iÉ-í-- -. - J-fc »" - at least one cylindrical seal for sealing (132) fixed on the duct (10) by means of flange 2

3. A device according to claim 22, characterized in that the seal for hermetic sealing ( 132) extends it, in the axial direction, a cylindrical protection insert (134). -k-l - M-M-ÍÉ-l-i-li, fa-a --- ^. ^ - a - ^ J - l - i > .l ^ - tofc..l- ,. ..... ^ "... ..., ,,. ,, - .i.» -. -. ^ ^ ^ ..