FR2857079A1 - Sleeves e.g. air duct, connecting device, has loose flange with hooks which comprise secondary hook to be engaged with hooking unit of beveled collar, and sealed joint arranged between collars and maintained by flange - Google Patents

Abstract

The device has a loose flange (31) movable on one of sleeves. The flange connects a base collar and a beveled collar (35), and has hooks (33). The base collar presents a flange complementary to a setback inside the flange. The collar (35) has a hooking unit. The hooks comprise a secondary hook (40) to be engaged with the unit. A sealed joint is arranged between the collars and maintained by the flange (31).

Description

DEVICE FOR CONNECTING TIGHTLY

TWO SLEEVES

  The present invention relates to a device adapted to seal a first sleeve to a second sleeve, the first sleeve having on at least one of its ends a first fixed annular collar, the second sleeve having on at least one of its ends a second fixed ring collar.

  It is known in the prior art to seal sealing sleeves allowing the flow of fluids, such as gases and liquids, by means of fixed and movable flanges.

  Thus, in order to seal two sleeves, the end of a first sleeve has a first fixed annular collar in which a second fixed annular collar of the end of a second sleeve is secured, the first collar having suitable housings adapted to cooperate with the second collar and hold together the two collars after a rotational movement of one of the sleeves around its longitudinal axis.

  It is also known, according to the prior art, to connect two sleeves in a sealed manner, to provide a third sleeve covering, for example silicone, which is arranged by sliding on one of the sleeves around the two end portions sleeves abutting.

  The third sleeve is then held on the end portions of the two sleeves by a friction and clamping effect, the clamping effect being obtained by means of a first and second clamping collar, the first collar being place by tightening around the portion of the third sleeve covering the first sleeve and the second collar being tightened around the portion of the third sleeve covering the second sleeve.

  This type of connection allows the formation of flexible connections between the sleeves for their implementation in tight places and requiring adaptation of the sleeves to their external environment. lo

  However, because of the flexibility of the connection, it is necessary to add support elements of the connection and sleeves to prevent mobility of the sleeves and thus a risk of breaking the connection too high.

  In addition, this type of connection requires investments in time, maneuver and elements, since it requires the installation of a third sleeve, two clamps and a support element of the connection, and are therefore a high cost price.

  In addition, known devices are often limited in weight and size.

  These problems are important especially in the field of aeronautics where the ventilation systems and pressurization must be as light as possible, thus saving fuel consumption.

  The present invention proposes to solve these problems by means of a simple device for use and installation, a small footprint and a low weight, making it possible to obtain improved sealing of the connected sleeves and a rigid connection thus reducing the number of sleeve support members.

  The present invention relates to a device adapted to seal a first sleeve to a second sleeve, the first sleeve having on at least one of its ends a first fixed annular collar, the second sleeve having on at least one of its ends a second fixed annular collar, said device comprising an annular rotating flange movable on at least one of said sleeves and capable of interconnecting said first and second annular collars, said rotating flange having regularly spaced hook-like tenons, characterized in that: first annular collar has a shape flange complementary to an inner recess of said rotating flange; The second annular collar comprises hooking means; The tenons comprise at least one secondary hook adapted to engage with said attachment means of said second annular collar.

  Advantageously, the attachment means are in the form of at least one parallelepipedic element having a beveled end.

  In order to allow the fixing of the annular collars between them, the attachment means have at least one longitudinal element capable of cooperating with the secondary hook.

  In order to facilitate the sliding of the rotating flange on the contiguous annular collars, the annular collars and the rotating flange have support points in the form of lugs and / or orifices for the user when he slides the rotating flange on the two collared annular collars.

  In order to reduce the weight of the device according to the invention, the annular collars and the rotating flange are made of plastic material.

  In order to allow a sliding of the rotating flange on the sleeve and a coaxial centering of the first and second sleeves, the diameter of the rotating flange is approximately 0.1 to 10 mm, and preferably 1 mm to the diameter of the flange. first and second sleeves.

  To improve the sealing of the device according to the invention, a seal is disposed between the first and second annular collars 15 joined together and held together by the rotating flange.

  In a preferred form, the sleeves are air ducts.

  In order to allow the rotation of the rotating flange to be locked on the annular collars, the rotating flange comprises at least one engagement element capable of engaging in a groove disposed on at least one of the two annular collars.

  The present invention is now described by way of purely illustrative and non-limiting examples of the invention, and with the aid of the accompanying drawings in which: FIG. 1 shows in perspective the end of a sleeve with a fixed annular collar; Figure 2 is a schematic sectional view of two sleeves connected by a rotating flange and two fixed annular collars; Figure 3 shows in perspective a rotating flange; Figure 4 shows a sectional view of two elements in the form of 5 connected by the rotating flange; Figure 5 shows in perspective a lug of the rotating flange cooperating with a lug of a fixed annular collar; FIG. 6 represents a perspective view of a set of ventilation ducts connected by means of the device according to the invention; Figure 7 shows an alternative sectional view of the two projecting elements and the rotating flange; Figures 8 and 9 show a partial view from above of two stages of installation of the rotating flange on the projecting elements of Figure 7; Figure 10 shows another sectional view of the two projecting elements and the rotating flange. Figure 11 shows a side view of a first annular collar suitable for use with a second possible embodiment of a rotating flange; Figure 12 shows a perspective view of three quarters of a second possible embodiment of a rotating flange according to the invention; Fig. 13 shows a perspective view of a second annular collar suitable for use with the second possible embodiment of the rotating flange; and Fig. 14 is a perspective view of the connection between the first and second annular collars. with the second embodiment of the rotating flange.

  Figure 1 shows a sleeve 1 of generally cylindrical shape and longitudinal axis X-X.

  The present invention applies to the ends of any type of sleeve 5 made from any type of suitable material having a shape and an end adapted to be connected to another sleeve.

  Advantageously, the sleeve 1 is made of a rigid material, for example a nonwoven material associated with a resin layer and coated with a layer of a waterproof and / or insulating product.

  The sleeve 1 has at least one of its ends a fixed annular collar 2 having a flange 3 with projecting elements 4.

  The projecting elements 4 are in any suitable form but preferably in the form of substantially parallelepipedal elements so as to form a rim 3 in the form of crenellations.

  The projecting elements 4 are of generally rectangular shape in a plane perpendicular to the longitudinal axis X-X.

  The projecting elements 4 are evenly spaced on the flange 3 and the intermediate space 3a between two successive projecting elements 4 is substantially equal to the largest dimension 4a of the projecting elements 4 of generally parallelepipedal shape.

  According to the representation of FIG. 2, the end of a first sleeve 1 with a first fixed annular collar 2 is connected to the end of a second sleeve 5 with a second annular collar 6.

  The second fixed annular collar 6 has a rim 7 with projecting elements 8.

  The first 1 and second 5 sleeves have, when assembled, substantially the same longitudinal axis X-X and the same diameter.

  The sleeves (1, 5) are in any suitable cylindrical form, i.e. they may be, for example, bent, folded over or U-shaped. The first 2 and second 6 annular collars are substantially identical, that is to say that they have the same projecting elements (4, 8), the same rim (3, 7) and the same spacings 3a between the projecting elements (4 , 8).

  The first 2 and second 6 fixed annular collars are connected and held together by a rotating flange 9, the preferred embodiment of which will be explained later.

  The rotating flange 9 makes it possible to ensure that the longitudinal axis of the first sleeve 2 is coaxial with the longitudinal axis of the second sleeve 5.

  The rotating flange 9 is inserted into the second sleeve 5 and slides freely on this sleeve 5.

  However, it is also possible to slide the rotating flange 9 on the first sleeve 1.

  To allow free sliding, the diameter of the rotating flange 9 is slightly greater than the diameter of the sleeve on which it slides, here the second sleeve 5.

  Thus, advantageously, the diameter of the rotating flange 9 is about 0.1 to 10 mm greater than the diameter of the sleeve (1, 5) on which it slides, and preferably 1 mm.

  Figure 3 shows in perspective a possible embodiment of the rotating flange 9.

  The rotating flange 9 is a generally cylindrical flattened ring of central axis Y-Y and has on one of its faces 9a ten regularly spaced pins.

  The pins 10 are in the form of hooks, that is to say that each post 10 is in the form of two parallelepiped elements (11, 12).

  The first parallelepipedal element 11 is arranged according to its largest dimension on the outer edge of the face 9a and perpendicularly thereto, the second parallelepipedal element 12 being arranged perpendicular to the first parallelepipedal element 11 and more precisely on the end of the first parallelepipedic element 11.

  In addition, the second parallelepipedal element 12 is turned towards the inside of the rotating flange 9, that is to say towards its central axis YY.

  According to the particular representation of FIG. 3, the rotating flange 9 has nine hook-shaped lugs 10, seven of them being identical and the two others having, in addition to the first and second parallelepiped elements (11, 12), a lug 13 of generally parallelepipedal shape and disposed on the second parallelepipedal element 12 projecting along the axis YY.

  More specifically, the lug 13 is disposed substantially in the middle of the distal face 10a of the post 10, that is to say on the face furthest from and opposite to the face 9a of the rotating flange 9.

  The intermediate space between two successive tenons is substantially identical to the largest dimension of the first parallelepiped elements 11 and is greater than or equal to the largest dimension 4a of the projecting elements (4, 8).

  FIG. 4 shows a sectional view of a projecting element 4 of the first annular collar 2 attached to the projecting element 8 of the second annular collar 6 and connected together by the rotating flange 9.

  The hook-shaped tenons represent, in section, an inverted U: the proximal branch 14 of the U is represented by the face 9a, and corresponds to the distance between the inner edge of the ring constituting the rotating flange 9 and the base of the first parallelepipedic element 11, the base 15 of the U corresponds to the distance between the second parallelepipedal element 12 and the face 9a of the rotating flange 9, and the distal branch 16 corresponds to the distance between the end of the first parallelepipedal element 11 and the The projecting elements 4 of the first annular collar 2 and the projecting elements 8 of the second annular collar 6 have, respectively, a sectional view, respectively, a width ((17), (19)) and a length ((18), (20)) capable of cooperating with the U of the rotating flange 9.

  The second parallelepipedal element 12 also has a sectional view of a width 21, the size of which is explained later.

  The distal face 10a of the post 10 corresponds, in section, to a length 22.

  The lugs 13 of the tenons 10 are disposed on the distal face 10a of the tenons 10 and have substantially a dimension equal to the length 22 of the distal face 10a, in section, on which they are arranged.

  In order to achieve a perfectly tight attachment of the sleeves (1, 5) with the aid of the rotating flange 9, the length of the second projecting element 8 is substantially equal to the length of the proximal branch 14 of the U of the post 10.

  Similarly, the length of the base 15 of the U of the post 10 is substantially equal to the sum of the widths (17, 19) of the projecting elements (4, 8) of the first 2 and second 6 annular collars.

  FIG. 5 represents in front perspective a lug 23 of an annular collar (2, 6) with a lug 13 of the rotating flange 9.

  Indeed, the fixed annular collar of the sleeve on which does not slide the rotating flange 9 has a lug 23 of generally parallelepipedal shape and adapted to cooperate with the ten hook-shaped having a lug 13.

  Thus, if the rotating flange 9 slides on the second sleeve 5, then the first annular collar 2 has the lug.

  By analogy, if the rotating flange 9 slides on the first sleeve 1, then the second annular collar 6 has the lug 23.

  The lug 23 is advantageously arranged on the annular collar 2 at a minimum distance corresponding to the width 21 of the second parallelepipedal element 12.

  By the choice of the lengths (18, 20) and widths (17, 19, 21) of the projecting elements (4, 8) and parallelepipedal elements (11, 12), the hook-shaped tenons cooperate with and maintain the projecting elements (4, 8) contiguous with the first 2 and 6 second fixed annular collars.

  The lug 23 of the annular collar (2, 6) is represented in a generally parallelepipedal shape, but it is understood that it can also be in any suitable form.

  The presence of the lugs (13, 23) allows the user of the device according to the invention to bear on it with the help of his fingers to slide, without risk of pinching and without effort, the rotating flange 9 on the fixed annular collars (2, 6).

  The sliding of the rotating flange 9 on the annular collars (2, 6) stops when the lug 23 of the rotating flange 9 comes into contact with the lug 13 of the annular collar 2.

  Several lugs are advantageously present on the rotating flange 9 and the corresponding annular collar to thereby allow the use of the lugs (13, 23) regardless of how the sleeves (1, 5) are connected.

  Advantageously, the annular collar (2, 6) and the rotating flange 9 each comprise two lugs (13, 23).

  The distance between two lugs 13 on the rotating flange 9 is equal to the same distance between two lugs 14 on the annular collar (2, 6).

  However, the rotating flange 9 and the annular collar (2, 6) corresponding may each comprise one, two, three lugs (13, 23) or more, the number of lugs (13, 23) being limited by the number of tenons in the form of a hook 10.

  To achieve the fixing of two ends of sleeves (1, 5) provided with an annular collar (2, 6) as defined in Figure 1 with the aid of the rotating flange 9 defined in Figure 3, it is necessary: in a first, join the ends of the sleeves (1, 5) provided with the annular collars (2, 6); superimposing and joining the protruding elements (4, 8) of one of the collars (2, 6) with the protruding elements (4, 8) of the other annular collars (2, 6); sliding the rotating flange 9 on the sleeve (1, 5) where it is inserted towards the two contiguous ends, the hook-shaped ten being directed towards both ends; inserting the hook-shaped tenons 10 in the free intermediate spaces 3a present between two successive projecting elements (4, 8), these intermediate spaces 3a having to be at least equal to the largest dimension of the first and second parallelepiped elements (11). 12) hook-shaped tenons; rotate the rotating flange 9 around its axis YY, which is then substantially coincident with XX, the rotational movement being carried out by the user using the lugs (13, 23) placed on the collar annular (2, 6) and the rotating flange 9; and possibly join the lugs 13 of the rotating flange 9 with the lugs 23 of the fixed annular collar (2, 6).

  Alternatively, the lugs (13, 23) can be replaced by orifices arranged in the same way as the lugs (13, 23), these orifices having the same function as the lugs (13, 23), that is, that is to say that they are points of support for the fingers of the user, thus facilitating the sliding of the rotating flange 9 on the annular collars (2, 6) contiguous, and are arranged on the annular collars (2 , 6) and the rotating flange 9.

  The orifices are advantageously designed and shaped to allow the user's fingers to use it as a fulcrum.

  Any type of suitable tool can also be used with these orifices to facilitate the sliding of the rotating flange (9) on the collared annular collars (2, 6).

  In a preferred form, the sleeves (1, 5) are air ducts for the circulation of hot air and cold air, and more particularly, for example, on board an aircraft.

  The annular collars (2, 6) and the rotating flange 9 are made of plastic material thus enabling cost savings and weight gain.

  Alternatively, the annular collars (2, 6) and the rotating flange 9 are made of metal materials when applied in atmospheric areas at high pressure.

  It is understood that the annular collars (2, 6) and the rotating flange 9 can however be made in any type of suitable material.

  This type of attachment is thus advantageously used in aircraft ventilation and pressurization systems where any weight gain on the structure of the aircraft results in a reduction in fuel consumption.

  Additionally, a seal of known type and of substantially the same diameter as the first and second sleeves (1, 5) is inserted at the interface of the ends of the first and second sleeves (1, 5) before they are not connected by the rotating flange 9.

  FIG. 6 represents an assembly 24 of ventilation ducts consisting of sleeves advantageously connected by means of the device according to the invention.

  Alternatively, as shown in FIG. 7, the rotating flange 9 has a third parallelepipedal element or blocking element 25 arranged perpendicularly on the face 9b, that is to say on the face opposite the face 9a having the first parallelepipedic element 11.

  The third parallelepipedal element 25 is arranged so that it is in contact with the body of the sleeve 5 on which the rotating flange 9 is inserted, that is to say that it is arranged on the end of the branch 14 of the U on the face 9b.

  Advantageously, the annular collars (2, 6) have a groove 26 adapted to cooperate with the end of the third parallelepipedal element 25 which comprises, for example, a cooperation element 27 adapted to engage in the groove 26, the cooperation element 27 is in any suitable form, for example in the form of a truncated sphere.

  The groove 26 is disposed either over the entire periphery of the annular collar body (2, 6), or partially on the annular collar body (2, 6).

  Advantageously, several cooperation elements 27 are regularly arranged on the rotating flange 9, each cooperation element 27 being able to cooperate with a specific groove 26.

  In this case, there are as many grooves 26 as there are cooperation elements 27.

  Advantageously, three grooves 26 are provided.

  The grooves 26 may also be provided directly on the end of the sleeve (1, 5).

  Thus, once the rotating flange 9 placed on the annular collars (2, 6) contiguous, the insertion into the groove 26 of the engagement member 27 causes the rotational locking of the rotating flange 9 on the two collars annular (2, 6) and thus ensures a better hold of the flange 9 on the collars (2, 6).

  Figures 8 and 9 show an alternative or additional embodiment of the projecting elements (4, 8).

  Figures 8 and 9 are top views of the sliding step of the projecting elements (2, 6) in the tenons of the rotating flange 9, a pin 10 being partially shown.

  The projecting element 4 of the first sleeve 1, of generally parallelepipedal shape, has a beveled edge 4a adapted to facilitate the engagement of the projecting element 4 of the first sleeve 1 in the rotating flange 9, the projecting element 8 the second sleeve 5 having been inserted beforehand into a stud 10 of the rotating flange 9.

  The presence of a bevelled edge 4a on one of the projecting element (4, 8) facilitates the insertion of the projecting elements (4, 8) in the tenons of the rotating flange 9, it being understood that the beveled edge 4a is of appropriate shape and size to facilitate the insertion of the projecting element (4, 8) into the studs 10.

  Alternatively, the rotating flange 9, and more specifically, the tenons 10 have a bevelled edge shaped to facilitate the sliding of the rotating flange 9 on the adjoining projecting elements (4, 8).

  FIG. 10 represents another sectional view of the projecting elements (4, 8) with the rotating flange 9.

  The groove 26 has a longitudinal dimension, that is to say parallel to the longitudinal axis of the sleeve (5), greater than any other of its dimensions. In this way, the engagement member 27 is held in the groove 26 and the rotating flange 9 can not be rotated about itself when the flange 9 is disposed on the projecting members (4, 8). ).

  In addition, in order to prevent any axial movement of the rotating flange 9 if it dissociates from the projecting elements (4, 8), a stop 28 is provided on the annular collars (2, 6).

  FIG. 11 represents a profile view of a first annular collar that can be used with a second possible embodiment of an annular flange according to the invention.

  Figure 11 shows a first fixed annular collar 29 said base collar adapted to be fixed on the end of a sleeve (1, 5).

  The base collar 29 is generally circular in shape with a central axis Z-Z and has a planar rim substantially coinciding with a plane perpendicular to the Z-Z axis.

  The rim 30 can take any suitable form.

  Thus, in a preferred embodiment, the flange 30 is in the form of a ring. However, the flange 30 may be in a crenellated form.

  Figure 12 shows a perspective side view of a second possible embodiment of a rotating flange.

  The rotating flange 31 according to a second possible embodiment is in a generally annular shape having a lower face 31a on which are arranged lugs 32 and an upper face 31b on which are disposed pins 33.

  More specifically, the lugs 32 and the lugs 33 are placed at regular intervals, respectively, on the lower face 31a and on the upper face 31b.

  The pins 33 are in the form of a hook and are identical to the hooks of the first possible embodiment of the rotating flange 9.

  In addition, the rotating flange 32 has an inner recess 34 of complementary shape to the flange 30 of the base collar 29.

  Thus, when the base collar 29 is fixed on one end of a sleeve (1, 5), the rotating flange 31 is slidable on this sleeve (1, 5), the diameter of the internal recess of the flange 31 being substantially equal to the diameter of the sleeve (1, 5) on which the base collar 29 is fixed.

  The rotating flange 31 is inserted into the sleeve (1, 5) so that its upper face 31b is directed towards the base collar 29 when the user slides the rotating flange 31 on the sleeve (1, 5).

  Thanks to the internal recess 34 of complementary shape to the flange 30, it is possible to wedge the rotating flange 31 on the base collar 29.

  FIG. 13 represents a perspective view of a second fixed annular collar 5, called a beveled collar 35 capable of cooperating with the base collar 29 and the rotating flange 31.

  The bevelled collar 35 is in a generally cylindrical shape and has an outline 36 on which are arranged at regular intervals hooking means 37 adapted to cooperate with the tenons 33 of the rotating flange 31.

  The beveled collar 35 is capable of being fixed on one end of a sleeve (1, 5) in such a way that the hooking means 37 are situated substantially in the same plane as the end of the sleeve (1, 5). .

  More specifically, the attachment means 37 are in the form of a parallelepipedal element 38 with a flattened and bevelled end 38a, flat or curved.

  In addition, the parallelepipedic element 38 has on its upper surface 38b a longitudinal element 39 whose function will be explained later. The longitudinal member 39 is in any suitable form and more

  particularly it has a slightly beveled edge.

  Fig. 14 shows a perspective view of the base collar assembly 29, bevelled collar 35 and rotating flange 31 in the assembled state, the base collar 29 not being visible from the perspective of FIG.

  It can be seen from FIG. 14 that the tenons 33 are of complementary shape to the parallelepipedal element 38 thus making it possible to keep the base collar 29 and the beveled collar 35 together.

  Thus, the user must, to connect the sleeves (1, 5) on which are fixed the base collar 29 and the beveled collar 35, the rotating flange 31 is inserted on the base collar 29; the rotating flange assembly 31 and base collar 29 is mounted on the sleeve 5; the collar 35 is mounted on the sleeve 1; wedging the rotating flange 31 on the flange 30 of the base collar 29; insert the hooks 33 of the rotating flange 31 into the spaces between two successive parallelepipedal elements 38 of the beveled collar; rotating the rotating flange 31 so as to engage the hooks 33 on the bevelled end 38a of the parallelepipedal element 38; hook a secondary hook 40 on the longitudinal member 39, the secondary hook 40 being disposed on at least one of the studs 33 of the rotating flange 31.

  Once, the secondary hook connection 40 / longitudinal member 39 made, then the rotating flange 31 can no longer move and the assembly thus formed (base collar 29 / beveled collar 351 rotating flange 31) is fixed and sealingly connects the ends of the sleeves (1, 5) to which the base collar 29 and the beveled collar 35 are attached.

  The secondary hook 40 and the longitudinal element 39 are of complementary shape, it being understood that the longitudinal element 39 may have a slightly beveled edge in order to facilitate the hooking of the secondary hook 40 on the longitudinal element 39.

  The pins 32 and 39 are points of support for the user when the latter 5 slides the rotating flange 31 on the attachment means 37.

  Alternatively, the lugs 32 may be replaced by orifices of known type and allowing at least the insertion of a finger therethrough, thereby also perform the fulcrum function. 15

Claims (10)

  1. Device adapted to seal a first sleeve (1) to a second sleeve (5), the first sleeve (1) having on at least one of its ends a first fixed annular collar (2, 29), the second sleeve (5) having on at least one of its ends a second fixed annular collar (6, 35), said device comprising an annular rotating flange (9, 31) movable on at least one of said sleeves (1, 5) and adapted to to connect together said first (2, 29) and second (6, 35) annular collars, said rotating flange (9, 31) having tenons (10, 33) in the form of regularly spaced hooks, characterized in that: said first annular collar (29) has a flange (30) of complementary shape to an inner recess (34) of said rotating flange (31); Said second annular collar (35) comprises hooking means (37); Said pins (10) comprise at least one secondary hook (40) adapted to engage with said hooking means (37) of said second annular collar (35).   2. Device according to claim 1, characterized in that said attachment means (37) are in the form of at least one parallelepiped element (38).   3. Device according to claim 2, characterized in that said parallelepipedal element (38) has a beveled end (38a) flat or curved.   4. Device according to one of the preceding claims, characterized in that said hooking means (37) have at least one longitudinal member (39) adapted to cooperate with said secondary hook (40).   5. Device according to one of the preceding claims, characterized in that said rotating flange (9, 31) and / or the collar (35) has points of support in the form of lugs (13, 32, 39). and / or orifices for the user when he slid said rotating flange (9, 31) onto said two adjoining annular collars (2, 6, 29, 35).   6. Device according to one of the preceding claims, characterized in that said annular collars (2, 6, 29, 35) and said rotating flange 15 (9) are made of plastic material.   7. Device according to one of the preceding claims, characterized in that the diameter of said rotating flange (9) is greater by about 0.1 to 10 mm, and preferably 1 mm, to the diameter of the first (1) and second (5) sleeves.   8. Device according to one of the preceding claims, characterized in that a seal is arranged between the first and second annular collars (2, 6, 29, 35) contiguous and held together by said rotating flange (9, 31).   9. Device according to one of the preceding claims, characterized in that said sleeves (1, 5) are air ducts.   10. Device according to one of the preceding claims, characterized in that said rotating flange (9, 33) comprises at least one cooperating element (27) adapted to engage in a groove (26) disposed on at least one of two annular collars (2, 6, 29, 35).