Pipe clamp for plastic or rigid water pipes, including means for retaining the joint

Abstract

The present invention relates to a rigid support collar for plastic or rigid water pipes, said collar comprising at least one bossed collar (1) and a retaining element (2) adapted to clamp a main pipe (3) to retain the bossed collar (1) on the latter, the bossed collar (1) comprising at least one central plate (7) having a concave lower wall and a support ring formed by a cylindrical neck (8), extending from the central part of the upper wall of the plate, and provided with an internal thread (9) capable of receiving outwards a tap (5) and inwards a seal (6) pressed against the main pipe (3) after installation and tightening of the support collar, and tabs (10, 11) extending on either side of the plate (7), said tabs (10,11) possibly comprising two arms; said support collar is notable in that said joint (6) comprises fastening means for removably fixing said joint (6) to the inner wall of the plate (7), said fastening means being capable of cooperating with the peripheral edge of the plate (7) of the bossed collar (1) and / or with the arms of the lugs (10,11). Figure 1,

Description

Description Title of the invention: Support collar for plastic or rigid water pipes comprising means for retaining the seal technical field

[0001] — The present invention relates to a collar for performing a support to connect a secondary pipe to a main pipe carrying a fluid under pressure, such as drinking water for example. This collar, commonly called The support collar is used particularly during extension work or renovation of a drinking water network. State of the art

[0002] In the field of water distribution in particular, it is well known to use a support collar when a main line carrying a fluid under pressure must be supplemented or increased by at least one secondary line, the rac- the rope of the latter should preferably be carried out without the transport of the The pressurized fluid is interrupted. These support collars include a A bossed collar that is intended to be placed on the main pipe to which one wants connect the new secondary pipe and equip it with a seal ensuring a watertight connection between the pipe and the bypass element. The said bossed collar is formed so as to to receive a closing device, such as a tap for example, to which is connected the new conduit or, possibly, a connecting piece linking the new drive directly to the existing main line.

[0003] — The bossed collar is mounted and held on the main pipe by means of a retaining element that surrounds the main pipe, the bossed collar and the element of the retaining devices being designed to fit the existing conduit on at least part of its circumference.

[0004] Furthermore, said bossed collar is usually made up of a curved plate with cylindrical span comprising in its central part a cylindrical neck, forming the grip ring, and fitted with an internal thread suitable for receiving a tap or Similar. The tap in question, which has a thread, once properly installed. Oriented in the collar of the bossed collar, it is locked in the collar by means of a screw cooperating with a lateral tapped hole drilled in the neck, the tapped hole extending perpendicular to the axis of revolution of the collar along a diameter of the latter.

[0005] — In order to ensure a seal between the bossed collar and the main pipe, a gasket The flexible tubular part is positioned under the bossed collar, 1.e. at the level of its face concave, at the level of the hole in the cylindrical neck, said joint has a front face intended to be in contact with the main pipe and an opposite rear face in contact with the concave face of the bossed collar, said seal being pressed onto the main pipe when the bossed collar is fixed and tightened onto the pipe by means of the retaining element. Such support collars are described in particular in French patent applications FR2785359, FR2807492 and FR2938041. Document FR2785359 describes a service connection collar for a pipeline, said collar comprising a rigid base with a cylindrical neck adapted to receive a service connection valve or similar and a retaining element, the seal being ensured by a flexible tubular gasket engaged in the base, from the lower end of the cylindrical neck, and extending beyond the base on the side of the main pipeline, said gasket being pressed against the pipeline by the base. This gasket includes an anti-creep ring, said ring having a front face facing the pipeline and a rear face opposite the front face. Furthermore, document FR2807492 describes a device for making branches in a fluid conduit, of the type comprising a collar and a flexible collar situated around a network conduit, the collar comprising a tubular seal whose base part can be fitted tightly to the surface of the conduit and whose distal part has a tubular extension ending in a forged lip, like a ring, which can extend against a circumferential fin, and of the type comprising, in addition, a transverse groove flush with the circumferential fin and into which the blade of a spatula or cutter which obstructs the passage of fluid in the branch can be inserted, said groove is located at the bottom of a circumferential mortise at the bottom of which is a sealing O-ring which is fixed to said mortise by a cylindrical sleeve which is coupled by sliding or screwing,thus forming a sealed chamber between the multi-seal and the O-ring, preventing the entry of foreign agents from inside or outside the bypass. Furthermore, document FR2938041 describes a gasket sealing system for a pipe support collar, the collar having a support head with an internal channel extending between a pipe side and a tap side opposite the pipe side, the tap-side channel having internally a tap section for fixing a tap inserted into the channel on the support head, the pipe-side channel having internally a gasket section for receiving the gasket in the support head, the gasket being a tubular element made of substantially elastic material intended to be compressed between the tap and the pipe when the collar is in place, mounted on the pipe.The outer periphery of the joint of a general cylindrical template is formed of an alternation of raised ribs and recessed reserves, the ribs and reserves being parallel areas extending vertically between the upper and lower ends of the joint, the joint section of the channel having a regular internal surface cy-. complementary index of the template of the external periphery of the joint so that free spaces are created between the joint section of the channel and the reserves at least in the uncompressed state of the joint. All these prior art support collars have the disadvantage of including a seal which is mounted loose under the bossed collar so that, when installing the support collar on a pipe, said seal is likely to come out of its housing making installation longer. Disclosure of the invention One of the aims of the invention is therefore to remedy these drawbacks by proposing a simple and inexpensive support collar, allowing quick and easy mounting on a pipe of any diameter without risk of loss of the seal during assembly. To this end, and in accordance with the invention, a rigid support collar for plastic or rigid water pipes is proposed, said collar comprising at least one bossed collar and a retaining element suitable for clamping a main pipe to hold the bossed collar on the latter, the bossed collar comprising at least a central plate whose lower wall is concave and a support ring formed by a cylindrical neck, extending from the central part of the upper wall of the plate, and provided with an internal thread capable of receiving outwards a tap and inwards a seal pressed against the main pipe after installation and tightening of the support collar, and tabs extending on either side of the plate, said tabs possibly comprising two arms;said collar is remarkable in that said seal includes fastening means allowing said seal to be removably fixed to the inner wall of the plate, said fastening means being able to cooperate with the peripheral edge of the plate of the bossed collar and / or with the arms of the lugs. Preferably, the joint consists of a flat base of the same shape and dimensions as the dimensions of the lower wall of the boss collar plate and a tubular part extending from the central part of the base, said tubular part being able to extend into a housing made in the lower part of the boss collar neck, under the internal threading, and the base being able to bear against the lower wall of the plate. The said fixing means consist of tabs extending perpendicularly to the base, on the same side as the tubular part, at two opposite ends of the base and whose ends are curved towards the tubular part to form hooks capable of cooperating with the peripheral edge of the bossed collar plate. According to a first variant of the execution, the legs are dimensioned in such a way that that they can extend between the legs of the bossed collar plate so that the hooks cooperate with the longitudinal peripheral edges of the plate. According to a second variant of the embodiment, the legs are dimensioned so that they can extend between the arms of the legs of the bossed collar plate, through respective openings, and the hooks cooperate with the transverse peripheral edges of the plate at the level of said openings. According to a third embodiment, the joint comprises two pairs of tabs, each tab extending from the ends of the longitudinal edges of the joint's base, and the hooks of these tabs cooperating with the upper edges of the tabs of the bossed collar. The tubular portion of the joint bears against the lower wall of the bossed collar's plate on a shoulder. According to another embodiment, each leg comprises two hooks extending perpendicularly to said legs and to the plane passing through the center of the joint and the legs, said hooks thus extending parallel to each other and parallel to the base of said joint, in such a way that said hooks are able to cooperate with the upper edges of the arms of the legs of the bossed collar plate when said legs extend between the arms of the legs, through the slots, of the plate. Furthermore, said seal is obtained in a flexible material, such as a natural or synthetic elastomer or similar, so that the base of said seal conforms to the concave shape of the lower wall of the plate and said seal can flow slightly when the support collar is tightened on the pipe. Incidentally, the upper face of the base of the joint includes ribs extending concentrically around the tubular part and, preferably, three concentric ribs. Brief description of the drawings Other advantages and features will become clearer from the following description of several embodiments, given by way of non-limiting examples, of the support collar according to the invention, with reference to the attached drawings in which: [fig.1] is a perspective view of a support collar according to the invention, [fig.2] is an exploded perspective view of the bossed collar of the service collar according to the invention, ready to receive a service valve, [fig.3] is a sagittal cross-sectional view of the bossed collar equipped with a sealing gasket for the support collar according to the invention, [fig.4] is a partial torn perspective of the support collar according to the invention on which a support valve is mounted, [fig.5] is a torn perspective view of the support collar and the joint of the support collar according to the invention, [fig.6] is a perspective view of the joint of the support collar according to the invention. [fig.7] is a perspective view of the bossed collar and the joint of the support collar according to the invention. [fig.8] is a perspective view of the bossed collar and the seal of an embodiment variant of the support collar according to the invention, [fig.9] is a perspective view of the bossed collar and the joint of the embodiment variant of the support collar according to the invention shown in figure 8, [fig.10] is a front and perspective cross-sectional view of the bossed collar and the joint of the embodiment of the support collar according to the invention re- shown in figures 8 and 9, [fig.11] is a perspective view of the bossed collar and the seal of a second embodiment of the support collar according to the invention, [fig.12] is a front and perspective cross-sectional view of the bossed collar and the joint of the second embodiment of the support collar according to the invention shown in figure 11, [fig.13] is a perspective view from below of the bossed collar and the joint of the second embodiment of the support collar according to the invention presented in figure 11, [fig.14] is a perspective view of the bossed collar and the seal of a third embodiment of the support collar according to the invention, [fig.15] is a torn perspective view of the bossed collar and the joint of the third embodiment of the support collar according to the invention re- presented in figure 14, [fig.16] is a perspective view from below of the bossed collar and the joint of the third embodiment of the support collar according to the invention re- presented in figures 14 and 15. Method of embodiment of the invention In the remainder of the description of the following invention, the same numeric references designate the same elements. The different views are not necessarily drawn to scale. With reference to Figures 1 and 2, the pipe support collar for plastic or rigid water pipes according to the invention comprises a bossed collar 1 and a retaining element 2 adapted to clamp a main pipe 3 to hold the bossed collar 1 onto the latter, the bossed collar 1 having at least one gripping ring 4 capable of receiving, on the outside, a service valve 5 and, on the inside, a seal 6 pressed against the main pipe 3 after the collar has been installed and tightened of support. The said bossed collar 1 consists of a curvilinear plate 7 with a cylindrical bearing surface comprising in its central part a cylindrical neck 8, forming the gripping ring 4, provided with an internal thread 9 and whose free ends are provided with lugs 10 and 11, extending on either side of the cylindrical neck 8, and comprising a rectangular opening 12 and 13 respectively forming female articulation means. Furthermore, in this particular embodiment, said retaining element 2 consists of a first module called retaining 14 of curvilinear shape with cylindrical span and whose free ends are respectively provided with a male or female articulation means, a module called clamping 15 of curvilinear shape with cylindrical span and a module called clamping 16. It is quite clear that the retaining element 2 can be substituted by any other retaining element, modular or not, rigid or flexible, without going out of the scope of the invention. According to an essential feature of the support collar according to the invention, with reference to Figures 1 to 7, the seal 6 consists of a flat rectangular base 17 of the same dimensions as the dimensions of the lower wall of the plate 7 of the bossed collar 1 and a tubular portion 18 extending from the central part of the base 17, said tubular portion 18 being adapted to extend into a recess formed in the lower part of the neck 8 of the bossed collar 1, below the internal thread 9, and the base 17 being adapted to bear against the lower wall of the plate 7. Said seal 6 is made of a flexible material, such as a natural or synthetic elastomer or similar, such that the base 17 of said seal conforms to the concave shape of the lower wall of the plate 7 and that said seal can flow slightly when the support collar is tightened onto the pipe 3.In this particular embodiment, the tubular part 17 has a square outer section and a circular inner section. Furthermore, the upper face of the base 17 of the joint comprises ribs 19 extending concentrically around the tubular part 18. In this particular embodiment, the joint comprises three concentric ribs 19. Furthermore, the seal 6 advantageously includes fastening means for removably attaching said seal 6 to the inner wall of the plate 7. In this way, the seal 6 is held under the bossed collar 1 during the pre-assembly of the service tap 5 onto the bossed collar, preventing any loss of the seal during pre-assembly and thus securing the installation of the service tap. These fastening means consist of tabs 20 extending perpendicularly to the base 17, on the same side as the tubular portion 18, at two opposite ends of the base 17, and whose ends are curved towards the tubular portion 18 to form hooks 21 adapted to cooperate with the peripheral edge of the plate 7 of the bossed collar 1. The tabs 20 and hooks 21 are formed as a single unit with the base 17 and the tubular portion 18, and from the same material as the latter, namely a flexible natural or synthetic elastomer. However, it is understood that the tabs 20 and hooks 21 could be made from a different material than the base 17 and the tubular portion 18, preferably a slightly less flexible material such as a polymer, without departing from the scope of the invention. In this embodiment, the joint will be obtained by overmolding using any method well known to those skilled in the art. Furthermore, in this particular embodiment, the lugs 20 are dimensioned so that they can extend between the arms of the lugs 10 and 11 of the plate 7 of the bossed collar, through the openings 12 and 13 respectively, and that the hooks 21 cooperate with the transverse peripheral edges of the plate 7 at the level of said openings 12 and 13. According to a first embodiment, with reference to figures 8 to 10, the support collar for plastic or rigid water pipes according to the invention comprises, in the same way as before, a bossed collar 1 and a retaining element, not shown in the figures, suitable for clamping a main pipe to hold the bossed collar 1 on the latter, the bossed collar 1 having at least one gripping ring 4 which can receive on the outside a service tap, not shown, and on the inside a seal 6 pressed against the main pipe 2 after installation and tightening of the support collar. The said bossed collar 1 consists of a curvilinear plate 7 with a cylindrical bearing surface comprising in its central part a cylindrical neck 8, forming the gripping ring 4, provided with an internal thread 9 and whose free ends are provided with lugs 10 and 11, extending on either side of the cylindrical neck 8, and comprising a light 12 and 13 respectively. The said support element may consist of any support element, rigid or flexible, modular or not, without going outside the scope of the invention. Furthermore, the seal 6 consists of a flat rectangular base 17 of the same dimensions as the dimensions of the lower wall of the plate 7 of the bossed collar 1 and a tubular part 18 extending from the central part of the base 17, said tubular part 18 being able to extend into a housing made in the lower part of the neck 8 of the bossed collar 1, under the internal thread 9, and the base 17 being able to bear against the lower wall of the plate 7. Said seal 6 is made of a flexible material, such as a natural or synthetic elastomer or similar, such that the base 17 of said seal 6 conforms to the concave shape of the lower wall of the plate 7 and that said seal 6 can flow slightly when the support collar is tightened on the pipe. Furthermore, the seal 6 advantageously includes fastening means for removably attaching said seal 6 to the inner wall of the plate 7. In this way, the seal 6 is held under the bossed collar 1 during the pre-assembly of the service tap 5 onto the bossed collar, preventing any loss of the seal during pre-assembly and thus securing the installation of the service tap. These fastening means consist of tabs 20 extending perpendicularly to the base 17, on the same side as the tubular portion 18, at two opposite ends of the base 17, and whose ends are curved towards the tubular portion 18 to form hooks 21 adapted to cooperate with the peripheral edge of the plate 7 of the bossed collar 1. The tabs 20 and hooks 21 are formed as a single unit with the base 17 and the tubular portion 18, and from the same material as the latter, namely a flexible natural or synthetic elastomer. However, it is understood that the tabs 20 and hooks 21 could be made from a different material than the base 17 and the tubular portion 18, preferably a slightly less flexible material such as a polymer, without departing from the scope of the invention. In this embodiment, the joint will be obtained by overmolding using any method well known to those skilled in the art. The joint 6 differs from the one described previously in that the base 17 of said joint 6 has a circular shape, the plate 7 of the bossed collar also having a circular shape, that the tubular part 17 has a circular outer section and a circular inner section and that the tabs 20 are dimensioned so that they can extend between the tabs 10 and 11 of the plate 7 of the bossed collar, so that the hooks 21 cooperate with the longitudinal peripheral edges of the plate 7. According to a second embodiment, with reference to figures 11 to 13, the support collar for plastic or rigid water pipes according to the invention comprises, in the same way as before, a bossed collar 1 and a retaining element, not shown in the figures, suitable for clamping a main pipe to hold the bossed collar 1 on the latter, the bossed collar 1 having at least one gripping ring 4 which can receive on the outside a service tap, not shown, and on the inside a seal 6 pressed against the main pipe 2 after installation and tightening of the support collar. The said bossed collar 1 consists of a curvilinear plate 7 with cylindrical bearing surfaces comprising in its central part a cylindrical neck 8, forming the gripping ring 4, equipped with an internal thread 9 and whose free ends are equipped with curvilinear lugs 10 and 11 with cylindrical bearing surfaces, extending on either side of the cylindrical neck 8. The said retaining element may consist of any retaining element, rigid or flexible, modular or not, without going outside the scope of the invention. Furthermore, the seal 6 consists of a flat rectangular base 17 of the same dimensions as the dimensions of the lower wall of the plate 7 of the bossed collar 1 and a tubular part 18 extending from the central part of the base 17, the base 17 being able to bear against the lower wall of the plate 7. Said seal 6 is obtained in a flexible material, such as a natural or synthetic elastomer or similar, such that the base 17 of said seal 6 conforms to the concave shape of the lower wall of the plate 7 and that said seal 6 can flow slightly when the support collar is tightened on the pipe. Furthermore, the seal 6 advantageously includes fastening means for removably attaching said seal 6 to the inner wall of the plate 7. In this way, the seal 6 is held under the bossed collar 1 during the pre-assembly of the service tap 5 onto the bossed collar, preventing any loss of the seal during pre-assembly and thus securing the installation of the service tap. These fastening means consist of tabs 20 extending perpendicularly to the base 17, on the same side as the tubular portion 18, at two opposite ends of the base 17, and whose ends are curved towards the tubular portion 18 to form hooks 21 adapted to cooperate with the peripheral edge of the plate 7 of the bossed collar 1. The tabs 20 and hooks 21 are formed as a single unit with the base 17 and the tubular portion 18, and from the same material as the latter, namely a flexible natural or synthetic elastomer. However, it is understood that the tabs 20 and hooks 21 could be made from a different material than the base 17 and the tubular portion 18, preferably a slightly less flexible material such as a polymer, without departing from the scope of the invention. In this embodiment, the joint will be obtained by overmolding using any method well known to those skilled in the art. The joint 6 differs from that described previously in that the tubular part 18 of the joint bears against the lower wall of the plate 7 of the bossed collar 1, on a shoulder 22 and in that it has two pairs of tabs 20, each tab 20 extending to the end of the longitudinal edges of the base 17 of said joint and the hooks 21 of said tabs 20 cooperating with the upper edges of the tabs 10,11 of the bossed collar 1. According to a final embodiment, with reference to Figures 14 to 16, the pipe support collar for plastic or rigid water pipes according to the invention comprises, in the same manner as before, a bossed collar 1 and a retaining element, not shown in the figures, adapted to clamp a main pipe to hold the bossed collar 1 onto the latter, the bossed collar 1 having at least one gripping ring 4 capable of receiving, on the outside, a tapping valve. load, not shown, and inwards a seal 6 pressed against the main pipe 2 after installation and tightening of the support collar. The said bossed collar 1 consists of a curvilinear plate 7 with a cylindrical bearing surface comprising in its central part a cylindrical neck 8, forming the gripping ring 4, provided with an internal thread 9 and whose free ends are provided with lugs 10 and 11, extending on either side of the cylindrical neck 8, and comprising a light 12 and 13 respectively. The said support element may consist of any support element, rigid or flexible, modular or not, without going outside the scope of the invention. Furthermore, the seal 6 consists of a circular flat base 17 of the same dimensions as the dimensions of the lower wall of the plate 7 of the bossed collar 1, which in this particular embodiment is also circular, and a tubular part 18 extending from the central part of the base 17, the latter being able to bear against the lower wall of the plate 7. Said seal 6 is obtained in a flexible material, such as a natural or synthetic elastomer or similar, such that the base 17 of said seal 6 conforms to the concave shape of the lower wall of the plate 7 and that said seal 6 can flow slightly when the support collar is tightened on the pipe. Furthermore, the seal 6 advantageously includes fastening means for removably attaching said seal 6 to the inner wall of the plate 7. In this way, the seal 6 is held under the bossed collar 1 during the pre-assembly of the service tap 5 onto the bossed collar, preventing any loss of the seal during pre-assembly and thus securing the installation of the service tap. These fastening means consist of tabs 20 extending perpendicularly to the base 17, on the same side as the tubular portion 18, at two opposite ends of the base 17, and whose ends are curved towards the tubular portion 18 to form hooks 21 adapted to cooperate with the peripheral edge of the plate 7 of the bossed collar 1. The tabs 20 and hooks 21 are formed as a single unit with the base 17 and the tubular portion 18, and from the same material as the latter, namely a flexible natural or synthetic elastomer. However, it is understood that the tabs 20 and hooks 21 could be made from a material other than the base 17 and the tubular portion 18, preferably a slightly less flexible material such as a polymer, without departing from the scope of the invention. In this embodiment, the joint will be obtained by overmolding using any method well known to those skilled in the art. The joint 6 differs from the one described previously in that the base 17 of said joint 6 has a circular shape, the plate 7 of the bossed collar also having a circular shape, and the tabs 20 extend radially and are diametrically opposite, and that the lugs 20 are dimensioned so that they can extend between the arms of the lugs 10 and 11 of the plate 7 of the bossed collar 1. Furthermore, each lug 20 includes two hooks 21 extending perpendicularly to said lugs and to the plane passing through the center of the joint 6 and the lugs 20, said hooks 21 thus extending parallel to each other and parallel to the base 17 of said joint 6, so that said hooks 21 are able to cooperate with the upper edges of the arms of the lugs 10 and 11 of the plate 7 of the bossed collar 1 when said lugs 20 extend between the arms of the lugs 10 and 11 of the plate 7 to hold said joint in position under the plate 7. Finally, it is quite clear that the examples we have just given are only particular illustrations and in no way limiting as to the fields of application of the invention.

Claims

Demands

1. Rigid support clamp for plastic or rigid conduits of water, said collar comprising at least one bossed collar (1) and a retaining element (2) suitable for clamping a main pipe (3) for to hold the bossed collar (1) on the latter, the bossed collar (1) comprising at least one central plate (7) the lower wall is concave and a supporting crown formed by a cy- neck lindrique (8), extending from the central part of the upper wall of the plate, and equipped with an internal thread (9) capable of receiving towards On the outside, a tap (5) and on the inside, a pressed seal (6). against the main pipe (3) after fitting and tightening the clamp of support, and the legs (10,11) extending on either side of the plate (7), said legs (10,11) possibly comprising two arm, characterized in that said joint (6) comprises means of fastening allowing said joint (6) to be removably fixed to the inner wall of the plate (7), said fastening means being suitable for cooperate with the peripheral edge of the plate (7) of the bossed collar (1) and / or with the arms of the legs (10,11).

2. A support collar according to claim 1 characterized in that that the joint (6) consists of a flat base (17) of the same shape and of same dimensions as the dimensions of the lower wall of the plate (7) of the bossed collar (1) and a tubular part (18) extending from the central part of the base (17), said tubular part (18) being able to extend into a dwelling constructed in the in- lower part of the collar (8) of the bossed collar (1), below the internal tapping (9), and the base (17) being able to bear against the lower wall of the platinum (7).

3. A support collar according to claim 2 characterized in that that said fastening means consist of tabs (20) extending perpendicular to the base (17), on the same side as the tubular part (18), at two opposite ends of the base (17) and whose ends are curved towards the tubular part (18) to form hooks (21) capable of cooperating with the peripheral edge of the plate (7) of the bossed collar (1).

4. Support collar according to claim 3 characterized in that that the legs (20) are dimensioned in such a way that they can extend between the legs (10) and (11) of the plate (7) of the collar boss (1) so that the hooks (21) cooperate with the peri- edges longitudinal spheres of the plate (7).

5. Support collar according to claim 3 characterized in that that the legs (20) are dimensioned in such a way that they can extend between the arms of the legs (10) and (11) of the plate (7) of the collar with boss (1), through lights (12) and (13) respectively, and that the hooks (21) cooperate with the transverse peripheral edges of the plate (7) at the level of said lights (12) and (13).

6. Support collar according to claim 3 characterized in that that said joint (6) comprises two pairs of tabs (20), each tab (20) extending to the end of the longitudinal edges of the base (17) of said joint (6) and the hooks (21) of said legs (20) cooperating with the upper edges of the tabs (10, 11) of the bossed collar (1).

7. Support collar according to claim 6 characterized in this that the tubular part (18) of the joint (6) bears against the in- wall lower part of the plate (7) of the bossed collar (1) on a shoulder (22).

8. Support collar according to claim 3 characterized in this that each leg (20) comprises two hooks (21) extending perpendicularly ocularly to said legs (20) and to the plane passing through the center of the joint {6) and the legs (20), said hooks (21) thus extending parallel between them and parallel to the base (17) of said joint (6), in such a way that said hooks (21) be able to cooperate with the upper edges the arms of the legs (10) and (11) of the plate (7) of the bossed collar (1) when said legs (20) extend between the arms of the legs (10) and (11), through the lights (12) and (13), of the plate (7).

9. Support collar according to any one of claims 2 to 8 characterized in that the base (17) of said joint (6) has a shape circular.

10. Support collar according to any one of claims 2 to 8 characterized in that the base (17) of said joint (6) has a shape rectangular.

11. Support collar according to any one of claims 2 at 10 characterized in that the tubular part (18) has a cross-section Square exterior and a circular interior section.

12. Support collar according to any one of claims 2 at 10 characterized in that the tubular part (18) has a cross-section An outer circular section and an inner circular section.

13. Support collar according to any one of claims 2 to 12 characterized in that said joint (6) is obtained in a material flexible, such as a natural or synthetic elastomer or similar, of such that the base (17) of said joint conforms to the concave shape of the lower wall of the plate (7) and that said seal may flow slightly when the support collar is tightened onto the pipe (3).

14. Support collar according to any one of claims 2 at 13 characterized in that the upper face of the base (17) of the joint (6) includes ribs (19) extending concentrically around the tubular part (18).

15. Support collar according to claim 14 characterized in that that the joint (6) comprises three concentric ribs (19).