Core having grooves arranged in a herringbone pattern, for the production of a tire with stays

Abstract

The present invention relates to a tool (1) for manufacturing a tire (40), said tool comprising a core (10) that has a central axis (Z10) and is subdivided into a succession of sectors (54, 55) which each comprise a plurality of grooves (12) designed to accommodate stays (5) intended to each connect a first anchoring point (M1) to a second anchoring point (M2) in order to reinforce the tire (40), each sector (54, 55) being arranged so as to be able to be moved in a direction referred to as "individual removal direction" (D_extract), said direction running within the individual angular range (A54, A55) over which said sector (54, 55) extends and being perpendicular to the central axis (Z 10).

Description

HERRINGBONE GROOVED CORE FOR THE MANUFACTURE OF A GUYED BANDAGE

[0001] The present invention relates to the general field of the manufacture of toroidal tires, and more particularly to the manufacture of pneumatic toroidal tires intended to equip vehicle wheels.

[0002] To improve the behavior, in particular the drift resistance, of the pneumatic tires, the applicant had the idea of ​​implementing thread-like reinforcements called "stays" which extend within the toric inflation cavity delimited by the tire, and which each connect an anchoring point located in a sidewall or a bead of the tire to an anchoring point located at the top of the tire.

[0003] To manufacture such stay bandages, the applicant has already proposed, in application WO-2022 / 200718, a tool comprising a toric core which has a shape matching that of the wall delimiting the cavity of the bandage, and in which grooves are hollowed out suitable for the passage of the stays.

[0004] Although such tooling is generally satisfactory, it presents a certain complexity, in particular because it is necessary, in order to be able to extract the core from the bandage without damaging the stays, to divide said core into a multitude of pieces, which must be extracted one by one according to very specific demolding trajectories. In particular, it is planned to axially subdivide the core into three annular sub-assemblies, namely a central crown forming the top of the core and two peripheral crowns called "ears" which are attached to the central crown, on either side of said central crown, to receive the sides and shoulders of the bandage, each of these three sub-assemblies itself being angularly divided, in azimuth around the central axis of the core, into a plurality of distinct sectors, which are moreover more numerous in the ears than in the central crown.

[0005] The multiplicity of the constituent elements of the core and the complexity of their respective extraction movements naturally tends to make the demoulding process, and therefore more generally the manufacturing process of a cable-stayed bandage, relatively long and rather inefficient on an industrial level.

[0006] The objects assigned to the invention therefore aim to remedy the aforementioned drawbacks and to propose improved tooling which makes it possible to simplify the manufacturing process of a bandage reinforced by stays and thus to improve the efficiency of said manufacturing process.

[0007] The objects assigned to the invention are achieved by means of a tool intended for the manufacture of a toroidal bandage, said tool comprising a core which materializes a volume called "reserved volume" corresponding to a cavity of the bandage, said core being delimited externally by a convex toroidal surface called "receiving surface" which is centered on a central axis and which comprises a radially external top zone, intended to receive components constituting the crown of the bandage, and, on either side axially of said top zone, a first lateral zone folded towards the central axis and intended to receive components constituting a first sidewall and a first heel of the bandage, as well as a second lateral zone folded towards the central axis and intended to receive components constituting a second sidewall and a second heel of the bandage,said core further comprising a plurality of grooves which are distributed in azimuth around the central axis and hollowed out inside the reserved volume, from the receiving surface, so that each of said grooves has a mouth which extends continuously, along the profile of the receiving surface, from a first mouth portion located in the top zone to a second mouth portion located in one of the first and second lateral zones and that each of said grooves forms a housing which is delimited, in azimuth around the central axis, by a first lateral wall and by a second lateral wall which are distant from each other in azimuth and which are both intersecting with the receiving surface, so that each groove is capable of receiving, inside the housing, between the first lateral wall and the second lateral wall, a filiform reinforcing element, called a "stay",which enters said groove through the first mouth portion and exits said groove through the second mouth portion, said stay being designed to permanently integrate the structure of the bandage and extend through the cavity of the bandage by connecting a first anchoring point, called the "top anchoring point", located in the top of the bandage, to a second anchoring point, called the "lateral anchoring point", located in one of the first and second flanks or one of the first and second heels of the bandage, said tooling being characterized in that the core is subdivided, in azimuth around the axis, central axis, in a succession of sectors which each cover a predetermined azimuthal angular range, called "individual angular range", around said central axis, at least one of said sectors, and preferably each of said sectors, being arranged so as to be able to be moved relative to the neighboring sectors, in order to be released from the tire, in a direction called "individual extraction direction" which belongs to the individual angular range occupied by said sector and which is perpendicular to the central axis, and in that several grooves, preferably all the grooves, belonging to this same sector are arranged according to a configuration called "radially extractable configuration" according to which,in projection in a plane called the "reference tangent plane" which is normal to the individual extraction direction of the sector considered and which is tangent to the radially outermost part of the summit zone of the receiving surface of said sector considered, the first side wall of each of said several grooves is located on a first side of, and at a distance from, the fictitious straight line called the "base straight line" which passes through the first anchoring point and through the second anchoring point of the stay fitting in the groove concerned, while the second side wall is located on the second side, opposite the first side, of the base straight line, and at a distance from said base straight line, so that said first and second side walls do not interfere with the volume swept by the stay when said stay is aligned, in orthogonal projection in the reference tangent plane, with the base straight line and which is created, between the stay and the sector,a relative movement carried by the individual extraction direction of said sector.,

[0008] Advantageously, by orienting the side walls of the grooves belonging to the same sector of the core according to the same common direction which corresponds to the individual extraction direction of the sector concerned, the tool according to the invention makes it possible to extract the sector concerned from the bandage, after constitution of said bandage and where appropriate after curing of said bandage, according to a centripetal radial extraction movement which is oriented in accordance with the individual extraction direction and which, in the radial plane containing the central axis of the core and said individual extraction direction, is therefore perpendicular to said central axis, while allowing all the stays present in said sector to slide naturally out of said grooves, according to this same individual extraction direction, without the side walls of the grooves hindering the passage of the stays. Thus, in particular, when the sector is extracted from the cavity of the bandage, the side walls of the grooves do not cause any forced deviation of said stays in azimuth, nor therefore do they generate any transverse force on the stays, which advantageously avoids the appearance in said stays of excessive longitudinal tension, which could lead to tearing of the stay or to breakage of the stay in tension. Similarly, this prevents the side walls of the grooves from generating significant friction on the surface of the stays, or even a shearing effect, which could weaken the stay or even tear it off.

[0009] Thanks to the arrangement proposed by the invention, any damage to the stay is therefore advantageously avoided during the demolding operation, and more generally any damage to the bandage, which would occur through abrasion, breakage or tearing of a stay.

[0010] Furthermore, the arrangement according to the invention makes it possible to produce a tool, and more particularly a core, the structure of which is simplified, in particular because the invention makes it possible to implement sectors which each cover the entire axial extent of the receiving surface, and therefore the entire axial width of the bandage from the first flank to the second flank, and which can each be moved in a single block according to the individual extraction direction. Thus, during the demolding step, it is possible to release in a single movement the entire portion of the bandage which occupies the individual angular range to which the sector concerned is assigned, here by executing a simple centripetal radial translation movement of the sector concerned according to its individual extraction direction.

[0011] The sector extraction movements can therefore be easily motorized and even automated, without risk to the integrity of the stays and the bandage, which makes it possible to considerably improve the precision, reproducibility, and speed of execution of the demolding operation, and therefore more generally the efficiency of the manufacturing process of said bandage.

[0012] Other objects, characteristics and advantages of the invention will appear in more detail on reading the description which follows, as well as with the aid of the appended drawings, provided for purely illustrative and non-limiting purposes, among which:

[0013] Figure 1 illustrates, in a perspective view with material cut away along a radial plane, an example of a pneumatic tire reinforced by stays which can be produced using a tool according to the invention.

[0014] Figure 2 illustrates, in a perspective view, the core of a tool according to the invention, here a core which comprises ten sectors forming an annular assembly, including five sectors called "keys" which are designed to be accessible by radially internal approach and to be removed first during disassembly of said annular assembly, each in its own individual radial extraction direction, and, alternating with the keys, five sectors called "vaults" which are supported and locked in position by the keys and designed to become maneuverable, in their own individual radial extraction directions, after they have been released by the removal of the keys.

[0015] Figure 3 is a front view, projected in a plane normal to the central axis, of the core of Figure 2.

[0016] Figure 4 is a top view of the core of Figures 2 and 3, in a reference tangent plane which is here perpendicular to the radial bisector plane of the upper sector of said core, which upper sector here corresponds to a vault.

[0017] Figure 5 is a perspective view of the core of Figure 2, to which, to better visualize the orientation of the grooves, the fictitious gauge planes have been added which delimit the passages cleared for the stays between the side walls of the grooves; in the arrangement shown, the first side wall and the second side wall of the same groove extend along planes parallel to each other, and coincide with said fictitious gauge planes.

[0018] Figure 6 is a partial front view, projected in a plane normal to the central axis, of the upper part of the core of Figure 5, showing the corresponding sector, here a vault, as well as the grooves and the corresponding fictitious gauge planes.

[0019] Figure 7 is a partial top view of the core of Figures 5 and 6, in a reference tangent plane which is perpendicular to the radial bisector plane of the vault sector, said view showing in particular said vault sector, the ends of the key sectors neighbors, as well as the grooves and the associated fictitious gauge planes; we can thus see that all the fictitious gauge planes belonging to this same vault sector, and therefore here all the side walls of the grooves dug in this vault sector, extend parallel to the individual extraction direction of said vault sector, which individual extraction direction is here normal to the plane of the figure.

[0020] Figure 8 is a detailed perspective view of a key sector that has been isolated from the core of Figures 2 to 7.

[0021] Figure 9 is a perspective view of the key sector of Figure 8, to which the representation of the fictitious gauge plans which materialize the passages reserved for the stays within the grooves has been added.

[0022] Figure 10 is a front view of the key sector of Figure 8, in a plane normal to the central axis of the core.

[0023] Figure 11 is a view from below of the key sector of Figures 8 and 10, in a plane normal to the individual extraction direction of said key sector, which view thus shows the radially internal face of said key sector, seen from the central axis.

[0024] Figure 12 is a top view of the key sector of Figures 8, 10 and 11, in a reference tangent plane which is normal to the individual extraction direction of the key sector, and which is here perpendicular to the radial plane forming the bisector plane of said key sector.

[0025] Figure 13 illustrates, in a schematic view, the principle of producing the stays from a single continuous wire which is engaged in the successive grooves forming a serpentine, and the loops of which form the extrema of the alternations of said serpentine are intended to form the lateral anchor points of the stays.

[0026] Figure 14 illustrates, in a perspective view, the core of Figure 1 within which the key sector shown in Figures 8 to 12 has been released by a centripetal radial translation along its individual extraction direction, in accordance with the movement carried out during the demolding operation to extract said sector from the cavity of the bandage.

[0027] Figure 15 is a front view of the core of Figure 14, in a plane normal to the central axis.

[0028] Figure 16 illustrates, in a partial sectional view in a radial plane, the initial configuration of two stays within two grooves of the core of Figure 2 during a step of making the bandage of Figure 1, the wall of the bandage matching the receiving surface of the core, and the stays each extending from a top anchoring point to a lateral anchoring point. Here, the two stays form a continuous wire which extends from the first side of the bandage, from which emerges the first stay which enters the first groove, to the second side of the bandage into which the second stay enters by leaving the second groove, after passing through the top of the bandage, into which is integrated the portion of the wire which forms the junction between the first stay leaving the first groove and the second stay entering the second groove.In the arrangement shown here, the grooves are further provided with compensators, each comprising a stop, here formed by a ball suspended by a spring, which make it possible to constitute, inside each groove, a reserve of stay length which can be mobilized to allow the heels of the bandage to move axially away from the receiving surface of the core, and therefore to move away from each other, without damage to the stays, to open the bandage to a sufficient extent to allow the axially widest portion of the core sector to pass when said sector performs its radial release movement in its individual extraction direction to exit the cavity of the bandage.

[0029] Figure 17 illustrates, in a partial sectional view in a radial plane, the configuration of the stays and the compensators during a demolding step during which the sides and the heels of the bandage are moved apart to move them away from the top of the bandage, which also has the effect of moving the heels apart from each other along the central axis of the bandage, so as to allow the extraction of the core sector from the cavity of the bandage, in the individual extraction direction perpendicular to the central axis, through the neck-shaped passage delimited by the sides and the heels of the bandage.During this stage, each stop concerned pushes against its spring to allow the stay to unfold in order to increase its apparent length and thus to adjust said apparent length to the distance which increases, under the effect of the deflection of the wall which allows the widening of the neck, between the first anchor point located in the top and the second anchor point located in the side.

[0030] Figure 18 illustrates, in a partial sectional view in a radial plane, the configuration of the stays and the compensators at the end of the demolding step, the relevant sector of the core being completely removed from the cavity of the tire, the stay being thus completely removed from the groove, and the sides and the heels of the tire having returned to their rest position, by elastic return, while, within the extracted sector, the stop is, under the effect of the return exerted by the spring, in the empty position that said stop occupies in the absence of stay pressing on said stop.

[0031] Figure 19 is an enlarged partial view of the core of Figure 2.

[0032] Figure 20 illustrates, according to a partial sectional view in a radial plane, the configuration of the stays and the compensators during a demolding step, in a second sector which is still in place within the cavity of the bandage, and which is distinct from and immediately adjacent to a first sector which is in the process of being extracted from the cavity as illustrated in Figure 17.

[0033] The present invention relates to a tool 1 intended for the manufacture of a toroidal bandage 40, as shown in FIG. 1.

[0034] In a manner known per se, such a toroidal bandage 40 comprises a crown 41 intended to form a tread, a first annular bead 42 and a second annular bead 43, each reinforced by at least one annular bead wire and designed to allow the bandage 40 to be attached to a mounting support such as a rim, as well as a first sidewall 44 and a second sidewall 45 which connect the crown 41 respectively to the first bead 42 and to the second bead 43.

[0035] The crown 41, the first and second flanks 44, 45 and the first and second heels 42, 43 form as a whole a wall 3 having a concave internal surface 3_in which delimits a cavity 4 of the bandage 40, cavity 4 which is intended to receive an inflation fluid, such as air, under a pressure greater than atmospheric pressure, in order to keep the bandage 40 inflated.

[0036] The tool 1 comprises a core 10, such as that shown in figures 2, 3, 14, 15, 16 and 19 which materializes a volume called “reserved volume” 11 corresponding to the cavity 4 of the bandage 40.

[0037] Said core 10 is delimited externally by a convex toroidal surface called “receiving surface” 10 out which is centered on a central axis Z 10.

[0038] The central axis Z10 of the core coincides in practice with the central axis of the tire 40, with respect to which the tire 40 has a shape of revolution, and which corresponds substantially to the axis of rotation of the wheel receiving said tire 40. This central axis Z10 defines three directions conventionally used by those skilled in the art: an axial direction, a radial direction, and a circumferential direction.

[0039] By “axial direction” is meant a direction parallel to the central axis Z10 of the core 10, i.e. parallel to the axis of rotation of the tire 40.

[0040] By "radial direction" is meant a direction which extends along a radius of the core 10, that is to say a direction which is secant and perpendicular to the central axis Z10.

[0041] By "circumferential direction" is meant a direction which is contained in a plane normal to the central axis Z10 and which is perpendicular to a radius itself perpendicular to the central axis Z10, that is to say, equivalently, an orthoradial direction which is normal to a radial plane containing the central axis (Z10). In a plane normal to the central axis Z10, said circumferential direction at a point considered is therefore the tangent to the circumference of a circle passing through said point considered and whose center is on said central axis Z10.

[0042] By "meridian plane" P MER, or "radial plane", is meant a plane which contains the central axis Z 10, which central axis Z10 thus forms a first direction of extension of said meridian plane while the second direction of extension of said meridian plane extends radially relative to said central axis Z 10. Such a meridian plane is therefore normal to the circumferential direction.

[0043] By "equatorial plane" P_EQ is meant the plane normal to the central axis Z 10 and which passes through the radially outermost point of the tire 40. Usually, said equatorial plane P_EQ is preferably located axially midway between the axially outermost points of the tire. Said equatorial plane P_EQ therefore axially divides the tire 2 into two toroidal halves, preferably substantially symmetrical, called, by analogy with the terrestrial globe, "hemispheres".

[0044] The receiving surface 10 out of the core 10 has a shape conjugated to the shape of the internal surface 3_in of the wall 3 of the bandage 40 which it is desired to manufacture.

[0045] The receiving surface 10 out of the core 10 comprises a radially external top zone 51 intended to receive components constituting the crown 41 of the bandage 40, and, on either side axially of said top zone 51, a first lateral zone 52 folded towards the central axis Z10 and intended to receive components constituting a first sidewall 44 and a first heel 42 of the bandage 40, as well as a second lateral zone 53 folded towards the central axis Z10 and intended to receive components constituting a second sidewall 45 and a second heel 43 of the bandage 40.

[0046] Typically, the components constituting the crown 41, the first and second sidewalls 44, 45 and the first and second beads 42, 43 will comprise rubber-based components, more particularly one or more raw rubber-based components, such as rubber strips or rubber plies, which plies and / or strips may optionally be provided with reinforcing threads embedded in a layer of rubber. Said components will be laid so as to cover the receiving surface 10 out and match the shape of said receiving surface 10 out to form the wall 3 of the tire 40, and more particularly the internal surface 3_in of said wall 3.

[0047] Preferably, according to an arrangement known per se, when the section of the bandage 40 is considered in a radial plane containing the central axis Z10, the wall 3 of the bandage has a shape which envelops the core 10 in the form of a narrowing when progressing towards the central axis Z10, that is to say that the minimum distance which axially separates the internal surface of the first heel 42 from the internal surface of the second heel 43 is strictly less than the maximum axial width of the internal surface 3_in of the wall 3, considered between the first flank 44 and the second flank 45. In other words, the first and second flanks 44, 45 define between them a neck, which the core 10 must cross to extract itself from the cavity, and the axial opening of which is preferably less than the overall axial width of the receiving surface 10 out of said core 10, as is notably visible in FIGS. 16 and 18.The internal surface 3_in of the wall 3 of the bandage 40, and the corresponding receiving surface 10 out of the core 10, thus preferably present, in section in a radial plane. containing the central axis Z10, a section in (capital Omega), as seen in figures 1, 8, 16, 17 and 18.

[0048] The core 10 is preferably metallic, for example made of steel. Said core 10 thus offers a rigid and robust receiving surface, and can be reused over a long period of time, for the successive manufacture of a large number of bandages 40.

[0049] The core 10 further comprises a plurality of grooves 12 which are distributed in azimuth around the central axis Z10 and hollowed out inside the reserved volume 11, from the receiving surface 10 out, so that each of said grooves 12 has a mouth 14 which extends continuously, along the profile of the receiving surface 10 out, from a first mouth portion 14A located in the top zone 51 to a second mouth portion 14B located in one of the first and second lateral zones 52, 53 of the receiving surface 10 out, as can be seen in particular in FIGS. 16 and 19.

[0050] Each of said grooves 12 thus forms a housing which is delimited, in azimuth around the central axis Z 10, by a first side wall 15 and by a second side wall 16 which are distant from each other in azimuth and which are both intersecting with the receiving surface 10 out, so that each groove 12 is capable of receiving, inside the housing, between the first side wall 15 and the second side wall 16, a filiform reinforcing element 5, called a “stay” 5, which enters said groove 12 via the first mouth portion 14A and emerges from said groove 12 via the second mouth portion 14B, said stay 5 being designed to permanently integrate the structure of the tire 40 and extend through the cavity 4 of the tire 40 by connecting a first anchoring point M1, called a “top anchoring point” Ml, located in the top 41 of the bandage 40, at a second anchoring point M2, called “lateral anchoring point” M2,located in one of the first and second flanks 44, 45 or one of the first and second heels 42, 43 of the bandage 40.,

[0051] The stay 5 advantageously has a certain flexibility, so as to be able to flex without damage, in particular during the manufacture of the tire 40, but a quasi-inextensibility in the direction of its length, considered from the first anchoring point M1 to the second anchoring point M2, so that, once the tire 40 has its definitive functional configuration, typically once the pneumatic tire 40 is mounted on a rim and inflated to the required pressure, the stay 5 is in a taut state, extending rectilinearly from the first anchoring point M1 to the second anchoring point M2. The stay 5 thus taut then advantageously prevents the top 41 of the bandage 40 from moving away from the sidewall 43, 44 of the bandage 40, and vice versa, which makes it possible to stiffen said bandage 40 and in particular to reduce, when the vehicle equipped with the bandage 40 is cornering, the drift phenomenon linked to the elasticity of the sidewalls 43, 44.

[0052] Preferably, the stay 5 will be formed from a single-strand or multi-strand wire, made from one or more strands of textile material, polymer material such as aramid, or even metallic material. According to one possible embodiment, the stay 5 is made from a composite wire made from glass fibers and resin.

[0053] For information purposes, the threadlike nature of the stay 5 is such that the length of the portion of the stay 5 which extends into the cavity 4, i.e. the length of the stay 5 considered along the path formed by the stay 5 from the first anchoring point M1 to the second anchoring point M2, is preferably at least ten times, preferably at least twenty times, or even at least fifty times greater than the maximum width of said stay, i.e. the largest dimension of the transverse section of the stay 5.

[0054] The stay 5 has at least one section which is embedded in a first portion 3 1 of the wall 3 corresponding to the top 41, so as to be integrated and fixed to the top 41, and at least one other section which is embedded in a second portion 3 2 of the wall 3 which corresponds to one of the first and second flanks 44, 45 or one of the first and second heels 42, 43, so as to be integrated and fixed to said flank 44, 45, respectively so as to be integrated and fixed to said heel 42, 43.

[0055] By convention, it may then be considered that the first anchoring point M1 corresponds to the point on the internal surface 3_in of the wall 3 at which the stay 5 emerges from the first portion 3 1 of the wall 3 corresponding to the top 41 to extend into the cavity 4 of the object, while the second anchoring point M2 corresponds to the point on the internal surface 3_in of the wall 3 at which the stay 5 emerges from the second portion 3 2 of the wall 3, corresponding to the side 44, 45 or the heel 42, 43 considered, to extend into the cavity 4.

[0056] Preferably, the receiving surface 10 out is solid, outside the openings formed by the mouths 14 of the grooves 12.

[0057] Preferably, the grooves 12 are blind, that is to say that said grooves 12 have a solid bottom 13, located under the receiving surface 10 out, in the reserved volume 11, as is notably visible in figures 12, 16 and 18.

[0058] Said solid bottom 13 extends, through the reserved volume 11, from the first mouth portion 14A of the groove 12, to the second mouth portion 14B of the groove 12.

[0059] In practice, the first mouth portion 14A is located opposite the position occupied by the first anchoring point M1, summit, when the first portion 31 of the wall 3 corresponding to the top 41 is in contact with the receiving surface 10 out, and the second mouth portion 14B is located opposite the position occupied by the second anchoring point M2, lateral, when the second portion 32 of the wall 3 corresponding to the flank 44, 45 or the heel 42, 43 considered is in contact with the receiving surface 10 out, as can be seen in FIG. 16. This is particularly the case during the operations of making the bandage 40 during which the components of the crown 41, the flanks 44, 45 and the heels 42, 43 are placed on the receiving surface 10 out.Preferably, the groove 12, and more particularly its mouth 14, will therefore advantageously extend, along the receiving surface 10 out, at least from the first anchoring point M1 to the second anchoring point M2.

[0060] As is clearly visible in figures 2, 3, 14 and 15, the core 10 is subdivided, in azimuth around the central axis Z 10, into a succession of sectors 54, 55 which each cover a predetermined azimuthal angular range A54, A55, called “individual angular range” A54, A55, around said central axis Z10.

[0061] As is clearly visible in Figures 15 and 17, at least one of said sectors 54, 55, and preferably each of said sectors 54, 55, is arranged so as to be able to be moved relative to the neighboring sectors 55, 54, in order to be released from the tire 40, in a direction called the “individual extraction direction” D extract which belongs to the individual angular range A54, A55 occupied by said sector 54, 55 and which is perpendicular to the central axis Z 10.

[0062] Geometrically, the individual extraction direction D extract is therefore secant to the central axis Z10 and forms a right angle with said central axis Z10. Equivalently, it can be considered that the individual extraction direction D extract of a sector 44, 45 corresponds to the straight line forming the intersection of the equatorial plane P_EQ and a meridian plane P MER which is located within the individual angular range A44, A45 occupied by said sector in azimuth around the central axis Z 10.

[0063] According to the invention, and as is particularly clearly visible in Figures 4, 7, and 12, several grooves 12, preferably all the grooves 12, which belong to the same sector 54, 55, which sector 54, 55 is arranged to be able to be moved in the aforementioned individual extraction direction D extract, are arranged in a configuration called the “radially extractable configuration” according to which, in projection in a plane called the “reference tangent plane” P REF which is normal to the individual extraction direction D extract of the sector 54, 55 considered and which is tangent to the radially outermost part of the top zone 51 of the receiving surface 10 out of said sector 54, 55 considered, the first side wall 15 of each of said several grooves 12 is located on a first side of, and at a distance from,the fictitious straight line called the “base line” D0 which passes through the first anchoring point M1 and through the second anchoring point M2 of the stay 5 which is housed in the groove 12 concerned, while the second side wall 16 is located on the second side, opposite the first side, of the base line D0, and at a distance from said base line D0, so that said first and second side walls 15, 16 do not interfere with the volume swept by the stay 5 when said stay 5 is aligned, in orthogonal projection in the reference tangent plane P REF, with the base line D0 and that a relative movement carried by the individual extraction direction D extract from said sector 54, 55 is created between the stay 5 and the sector 54, 55.,

[0064] Thus, the invention allows the stays 5 to freely exit the grooves 12, without the stays 5 being deflected in azimuth by the side walls 15, 16 of the grooves 12, when the sector 54, 55 is set in motion relative to the bandage 40 according to a single rectilinear translation movement carried by the individual extraction direction D extract.

[0065] Indeed, each groove 12 advantageously leaves free a passage which contains a fictitious volume obtained by scanning in rectilinear translation along the individual extraction direction D extracts a fictitious body which has the transverse dimensions of the stay 5, which is initially located inside the reserved volume 11, and which passes through the first anchoring point M1 and the second anchoring point M2 while being aligned, in projection in the reference tangent plane P REF, on the base line DO, such that this base line DO is defined by the nominal positions of the first and second anchoring points M1, M2, that is to say by the positions occupied by the first and second anchoring points M1, M2 during the making of the bandage 40, and therefore the positions occupied by said first and second anchoring points M1, M2, during the making of the bandage and then at the end of the making of the bandage 40, when the crown 41, the first and second heels 42,43 and the first and second flanks 44, 45 of the bandage are in contact with the receiving surface 10 out of the core 10 so that the internal surface 3_in matches said receiving surface 10 out.,

[0066] It will be noted that, the summit anchor point M1 being at a radial distance from the central axis Z0 which is greater than the radial distance at which the lateral anchor point M2 is located, the base line D0 is non-parallel to the central axis Z0. As will be seen later, the base line D0 is also preferably contained in a radial plane, in which case said base line D0 is secant to the central axis Z0. In said radial plane, said base line D0 then extends obliquely, at a non-zero angle of inclination, relative to the central axis Z0.

[0067] In practice, the implementation of a radially extractable configuration according to the invention has the consequence that when one is placed in the reference tangent plane P REF and one looks at the receiving surface 10 out of the same sector 54, 55, in the individual extraction direction D extract, as in FIG. 12, one sees in full all the bottoms 13 of the grooves 12 through the mouths 14 of said grooves.

[0068] The housings defined by the grooves 12 of the same sector 54, 55 in accordance with the radially extractable configuration, here therefore preferably the housings defined by all the grooves 12 of the same sector 54, 55, to accommodate the stays 5, therefore have, in other words, shapes which are all demouldable with respect to the same common direction, here shapes which are all demouldable in relation to the individual extraction direction D extract from the sector 54, 55 considered.

[0069] Preferably, the individual extraction direction D extract is contained in the meridian plane which forms the bisector plane of the sector 54, 55 considered. By "bisector plane", noted "P MER BISECTOR", we mean the radial plane which contains the central axis Z 10 and which divides the individual angular range A54, A55 occupied by the sector 54, 55 considered into two equal azimuthal angular sub-ranges.

[0070] If we consider, in the equatorial plane P_EQ normal to the central axis Z 10, the arc of a circle which is formed around the central axis Z10 by the portion of the circumference, radially the most external, of the receiving surface 10 out belonging to the sector 54, 55 considered, arc which thus defines, with respect to the central axis Z 10, an angle corresponding to the individual angular range A54, A55 occupied by said sector 54, 55, then the individual extraction direction D extract is carried by the bisector of said angle, that is to say the bisector of said individual angular range A54, A55, said bisector being the half-line which comes from the central axis Z10 forming the vertex of the angle and which passes through the middle of the arc of a circle to divide the angular range A54, A55 into two equal adjacent angles, as can be seen in Figures 3, 10 and 15.The normal reference plane P REF is then orthoradial, that is to say normal to the bisector and tangent to the arc of a circle formed by the circumference portion of the receiving surface 10 out, so that said reference plane P REF is tangent to the arc of a circle at the midpoint of said arc of a circle, which corresponds to the intersection of said bisector with said arc of a circle.

[0071] Certainly, it would be possible, in absolute terms, to use an individual extraction direction D extract which, although carried by a radial plane and being perpendicular to the central axis Z10, would not be contained in the bisector plane of the sector 44, 45 considered, but in a radial plane which would be closer to one of the ends of the individual angular range A54, A55 than to the other end of said individual angular range A54, A55 covered by the sector 54, 55 considered. Thus, in front view in a plane normal to the central axis Z10, the individual extraction direction D extract would appear inclined relative to the bisector plane.

[0072] However, we will prefer to choose an individual extraction direction D extract carried by the bisector plane P MER BISECTOR, and therefore centered on the sector 54, 55 considered.

[0073] Thus, the individual extraction direction D extract of a sector 54, 55 considered will preferably be carried by the straight line formed by the intersection of the equatorial plane P_EQ with the bisector meridian plane P MER BISECTOR of said sector 54, 55 considered.

[0074] Such an arrangement centered on the bisector plane will simplify the structure of the core 10, and in particular the arrangement of the joint planes between adjacent sectors 54, 55, as well as the management of extraction movements. In addition, it will thus be possible to produce families of sectors 54, 55, in this case a family of sectors forming keys 54 and a family of sectors forming vaults 55 as described below, which will be substantially or even exactly identical to each other within the same family, and therefore interchangeable with each other, between members of the same family, within the same core 10, which will simplify the manufacture and assembly of the core 10.

[0075] Likewise, it will be possible to produce sectors 54, 55 which will have a symmetrical arrangement with respect to their bisector plane, which will thus form a sagittal plane, which will make it possible to place the sector 54, 55 concerned indifferently in one direction or the other within the core 10, the first lateral zone 52 being able to be interchanged with the second lateral zone 53 without consequence for the bandage 40.

[0076] Preferably, as can be seen in particular in Figures 8 and 16, the sector 54, 55 considered comprises on the one hand a first convex lobe 17 which extends from the top zone 51 to the first lateral zone 52 and which comprises a first set of grooves 12 and on the other hand a second convex lobe 18 which extends from the top zone 51 to the second lateral zone 53 and which comprises a second set of grooves 12.

[0077] The first lobe 17 here forms a left lobe in Figure 16, and the second lobe 18 a right lobe, located opposite the left lobe 17 with respect to the equatorial plane P_EQ. The first lobe 17 and the second lobe 18 make it possible to define rounded bulges of the cavity 4 of the bandage, to ensure a smooth, curved transition of the wall 3 between the top 41 and the sides 44, 45 of the bandage, in an area which is located radially at more greater distance from the central axis Z 10 than the narrowing forming the neck delimited by the heels 42, 43.

[0078] The first lobe 17 and the second lobe 18 of the same sector 54, 55 are advantageously integral with one another, preferably formed in one piece with one another, so as to form a subassembly which is movable as a whole in the individual extraction direction D extract of the sector 54, 55 considered.

[0079] The sector 54, 55 considered thus forms a single integral block which extends from one axial end of the internal surface 3_in of the bandage to the other axial end of the internal surface 3_in and which presents, in section in a radial plane containing the central axis Z 10, a section in (capital Omega), as can be seen in particular in figure 16.

[0080] The first set of grooves 12 and the second set of grooves 12 of said sector 54, 55 are arranged in accordance with the same radially extractable configuration defined from said individual extraction direction D extract.

[0081] Thus, advantageously, it is possible to extract from a block, in a single centripetal radial movement carried by the same individual extraction direction D extract which is common to all the grooves 12 of the first set and the second set, the entire portion of the core 10 which covers the angular range A54, A55 and which fills the cavity 4 of the bandage from one axial end of the cavity 4 to the other axial end of the cavity 4.

[0082] It is therefore no longer necessary to axially divide the core 10, and in particular the sector 54, 55 considered, into several pieces which should each be extracted according to different movements.

[0083] It will also be noted that the grooves 12 of the first set of grooves 12 are preferably contained in the first hemisphere of the core 10, on one and the same side relative to the equatorial plane P_EQ, and are interrupted axially set back from said equatorial plane P_EQ, while the grooves 12 of the second set of grooves 12 are contained in the other hemisphere of the core 10, on the opposite side relative to the equatorial plane P_EQ, and are interrupted axially set back from said equatorial plane, P_EQ.

[0084] Thus, the receiving surface 10 out has a solid central strip 56 in the top zone 51, which central strip 56 forms, when the sectors 54, 55 are assembled to form the annular structure of the core 10, an annular strip around the central axis Z10, an annular strip which is devoid of mouths 14 of grooves 12 and which is split at the level of the joint planes between adjacent sectors 54, 55.

[0085] Said central strip 56 advantageously accommodates and supports, outside the grooves 12, the portions of the stays 5 which form the summit anchoring points Ml, as well as the constituent components of the top 41 of the bandage in which said portions of the stays 5 forming the summit anchoring points Ml are inserted.

[0086] According to a preferred characteristic which may constitute as such a definition of the invention, each groove 12 which is arranged in accordance with the radially extractable configuration leaves clear, in the entire portion of the reserved volume 11 which extends from the location provided for the stay 5 inside said groove 12 to the mouth 14 of said groove 12, a free space called “useful passage” 19 which extends from a first fictitious gauge plane PG1 which is parallel to the individual extraction direction D extract and parallel to the base line D0, and located at a distance from said base line D0 on one side of said base line D0 so as to be tangent to the first side wall 15, to a second fictitious gauge plane PG2 which is also parallel to the individual extraction direction D extract and parallel to the base line D0, so that said second gauge plane PG2 extends parallel to the first gauge plane PG1,said second gauge plane PG2 being located at a distance from said base line D0 on the other side of said base line D0 so as to be tangent to the second side wall 16.,

[0087] For better understanding, the gauge planes PG1, PG2, which are each perpendicular to the same reference tangent plane P REF associated with the sector 54, 55 considered, are shown in figures 5, 6, 7 and 9.

[0088] Each pair of first and second gauge planes PG1, PG2 delimits a hollow air gap, which corresponds to the useful passage 19 in which the stay 5 will be housed.

[0089] Within each groove 12 conforming to the radially extractable configuration, the first side wall 15 and the second side wall 16 of said groove 12 remain outside the useful passage 19, on either side of said useful passage 19 delimited by the first and second gauge planes PG1, PG2, that is to say on either side of the air gap delimited by the first and second gauge planes PG1, PG2.

[0090] For this purpose, the first side wall 15 can extend parallel to the first gauge plane PG1, and in particular merge with said first gauge plane PG1, as is the case in Figures 5, 6, 7 and 9.

[0091] According to a variant, the first side wall 15 can form a clearance angle relative to said first gauge plane PG1, so that said first side wall 15 extends obliquely and gradually moves away from the first gauge plane PG1, on the side opposite the side where the second gauge plane PG2 is located, to create a housing which widens from the bottom 13 towards the mouth 14 of the groove 12.

[0092] Likewise, the second side wall 16 may preferably extend parallel to the second gauge plane PG2, and in particular merge with said second gauge plane PG2, as is the case in FIGS. 5, 6, 7 and 9.

[0093] Alternatively, the second side wall 16 may form a clearance angle relative to said second gauge plane PG2, such that said second side wall 16 extends obliquely and gradually moves away from the second gauge plane PG2, on the side opposite the side where the first gauge plane PG1 is located, to create a housing which widens from the bottom 13 towards the mouth 14 of the groove 12. According to a possible arrangement, each of the first and second side walls 15, 16 will have a clearance angle.

[0094] In all cases, the first and second side walls 15, 16, preferably made of metal, are advantageously rigid, in order to ensure precise guidance and positioning of the stay 5.

[0095] Preferably, the distance W19 which separates the second gauge plane PG2 from the first gauge plane PG1, a distance which is called the “useful passage width” W19, is between 0.3 mm and 3 mm, preferably between 0.8 mm and 2.2 mm, for example between 1 mm and 1.8 mm, or even between 1.1 mm and 1.3 mm.

[0096] In practice, the useful passage width W19 will be chosen to be equal to or greater than the largest transverse dimension of the stay 5, for example between 101% and 160% of the largest transverse dimension of the stay 5, for example between 110% and 150%, or even between 110% and 130%, for example equal to 120% of the largest transverse dimension of the stay 5.

[0097] More specifically, since the diameter of the stay 5 is known, a sizing rule can be applied which consists of choosing a useful passage width W19 equal to the diameter of the stay 5 increased by 10% to 30%, for example by 20%.

[0098] For information purposes, the largest dimension of the cross-section of the stay 5, i.e. the diameter of the stay 5 when said stay 5 is formed by a wire or cable having a circular cross-section, is preferably between 0.3 mm and 3 mm, for example between 0.8 mm and 1.2 mm. This dimension may of course be adapted according to the size of the bandage 40.

[0099] Preferably, the first side wall 15 and the second side wall 16 of at least one groove 12 arranged in the radially extractable configuration, and preferably the first side wall 15 and the second side wall 16 of each of the grooves 12 which are arranged in the radially extractable configuration, are planar and extend parallel to each other and parallel to the individual extraction direction D extract.

[0100] Thus, the first side wall 15 and the second side wall 16 can be generated along the same generating line, which corresponds to the individual extraction direction D extract.

[0101] In practice, such an arrangement according to which the first and second side walls 15, 16 delimiting the same groove are flat and parallel to each other, as well as the azimuthal fineness of the width W19 of the useful passage 19 formed between these side walls 15, 16, allow in particular precise azimuthal positioning of the stays 5.

[0102] Such an arrangement also makes it possible to easily produce the grooves 12 of the same sector 54, 55 by means of a relatively simple machining process, for example by sawing using a saw whose width corresponds to the width of the useful passage W19, or by electroerosion using a wire which is stretched in a direction parallel to the base line D0 and which is made to penetrate into the material of the core 10 following the individual extraction direction D extract.

[0103] Furthermore, in such an arrangement, the first side wall 15 merges with the first gauge plane PG1, the second side wall 16 merges with the second gauge plane PG2, and the width of the useful passage W19 corresponds to the width W12 of the groove, in particular to the width of the groove W12 as considered in the depth range of said groove 12 into which the stay 5 penetrates and is housed during the step of making the bandage 40.

[0104] As an indication, the width W12 of the groove 12, in particular at the location where the stay 5 is housed during the production of the bandage 40, is preferably between 101% and 160% of the largest transverse dimension of the stay 5, for example between 110% and 150%, or even between 110% and 130% of the largest transverse dimension of the stay 5, for example equal to 120% of the largest transverse dimension of the stay, and / or, in absolute terms, between 0.3 mm and 3 mm, preferably between 0.8 mm and 2.2 mm, for example between 1 mm and 1.8 mm, or even between 1.1 mm and 1.3 mm. Here again, we can use a sizing rule which consists of choosing a groove width W12 equal to the diameter of the stay 5 increased by 10% to 30%, for example by 20%.

[0105] Preferably, for each of the grooves 12 which are arranged in accordance with the radially extractable configuration, the first anchoring point M1 and the second anchoring point M2 of the same groove 12 are located at the same azimuthal position around the central axis Z 10.

[0106] Thus, once stretched in functional position within the bandage 40, each stay 5 will extend at the same azimuth, and more generally in the same radial plane.

[0107] It will be noted that the fact on the one hand of placing, for each stay 5, the first anchoring point M1 and the second anchoring point M2 at the same azimuthal position, which has the effect that the base line D0 is contained in a radial plane, in this case the radial plane which is located at the azimuth common to the first and second anchoring points M1, M2, and therefore the radial plane which contains said first and second anchoring points M1, M2, and on the other hand of combining this arrangement with the orientation of the grooves 12 according to the radially extractable configuration specific to the invention, is visually translated, due to the curve of the receiving surface 10 out, by grooves 12 which, in front view in a plane normal to the central axis Z10, present, as is visible in figures 3, 6, 10 and 15, a intersection with the receiving surface lO out, and therefore a mouth trace 14, which has a curved shape, the curvature of which increases all the more as the groove 12 considered is distant from the radial plane containing the individual extraction direction D extract, and therefore here, the curvature of which increases all the more as the groove 12 considered is distant from the bisector meridian plane P MER BISECTOR of the sector 54, 55 considered.

[0108] It will be noted that, for the same reason, seen from the outside of the bandage 40, and more particularly in top view in the reference tangent plane P REF normal to the individual extraction direction D extract, the grooves 12 of the first set of grooves formed in the first lobe 17 of a sector 54, 55 form, with the grooves 12 of the second set of grooves belonging to the second lobe 18 of the same sector 54, 55, in particular in the summit zone 51, herringbone patterns, as is notably visible in FIGS. 2, 4, 7, 12, 14 and 19.

[0109] Seen in the reference tangent plane P REF, the grooves 12 are all the more inclined, relative to the circumferential direction, and therefore all the more folded towards the circumferential direction, as said grooves 12 are distant, in azimuth, from the meridian plane P MER containing the individual extraction direction D extract, here therefore all the more inclined as the grooves 12 are distant, in azimuth, from the bisector meridian plane P MER BISECTOR of the sector 54, 55 considered.

[0110] In this respect, it will be noted that the first gauge plane PG1 and the second gauge plane PG2 of the same groove 12 are certainly parallel to each other, and both perpendicular to the reference tangent plane P REF, but that, on the other hand, the first and second gauge planes PG1, PG2 of a first groove are not parallel to the first and second gauge planes PG1, PG2 of a second neighboring groove 12 which belongs to the same sector 54, 55, and more particularly which belongs to the same lobe 17 as the first groove, but which is offset in azimuth relative to the first groove.Thus, although the first and second gauge planes PG1, PG2 of the second groove 12 are also perpendicular to the same reference tangent plane P REF as the first and second gauge planes PG1, PG2 attached to the first groove 12, the first gauge plane PG1 and the second gauge plane PG2 attached to the second groove form, with respect to the first gauge plane PG1 and with respect to the second gauge plane PG2 of the first groove 12, in the. tangent reference plane P REF, a non-zero angle, as is notably visible in Figure 12. This is advantageously valid for any pair of first and second grooves 12 which are arranged in accordance with the radially extractable configuration and which are considered relative to each other within the same sector 54, 55.

[0111] Preferably, the angular repetition pitch, noted K 12, which separates in azimuth two successive first anchoring points M1, defining, within the same sector 54, 55, two successive grooves 12 arranged in accordance with the radially extractable configuration, is between 0.75 degrees and 3 degrees, preferably between 1 degree and 2 degrees, for example preferably equal to 1.5 degrees.

[0112] It is thus possible to obtain a large number of shrouds 5 distributed over the angular range A54, A55 considered, and more generally which are distributed in a relatively homogeneous manner while being close to each other within the bandage 40, which gives excellent behavior of the bandage 40 when drifting.

[0113] It should be noted that the above-mentioned values, in particular the angular repetition pitch values ​​K12, will be applicable in particular to tires intended to be mounted on rims with a diameter of 17 inches to 24 inches, in particular for passenger vehicles with a sporting purpose.

[0114] Preferably, and as is clearly visible in particular in Figures 2, 3, 14 and 15, the core 10 comprises two families of sectors 54, 55, namely on the one hand a first family of sectors 54 forming sectors called "keys" 54, which are designed to be accessible by radially internal approach and to be removed first during disassembly of the core 10, each in its own individual extraction direction D extract, and on the other hand a second family of sectors 55 which form, alternating with the keys 54, sectors called "vaults" 55 which are supported and locked in position by the keys 54 and designed to become maneuverable, each in its own individual radial extraction direction D extract, after said vaults 55 have been released by the removal of the keys 54.

[0115] Preferably, the keys 54, in particular all the keys 54 of the same core 10, will be identical to each other, and therefore interchangeable with each other.

[0116] Likewise, the vaults 55, in particular all the vaults 55 of the same core 10, will be identical to each other, and therefore interchangeable with each other.

[0117] This will allow the standardization of the manufacturing and assembly of the core 10.

[0118] Preferably, the individual angular range A54, A55 covered by each sector 54, 55 is between 5 degrees and 90 degrees.

[0119] More particularly, the individual angular range A54 covered by each key 54 will be between 5 degrees and 20 degrees, for example between 10 degrees and 15 degrees, and the individual angular range A55 covered by each vault 55 will be between 50 degrees and 90 degrees, for example equal to 60 degrees.

[0120] By convention, the individual angular range A54, A55 of a sector 54, 55 will be measured in the equatorial plane P_EQ, on the external circumference, at the maximum radius, of the receiving surface 10 out, between the two joint planes which mark the azimuthal limits of the sector 54, 55 considered and therefore the start of the neighboring sectors 55, 54. This individual angular range A54, A55 will correspond, in the equatorial plane P_EQ, to the angle whose apex is located on the central axis Z 10 and which intercepts the arc of a circle drawn by the radially external surface of the sector 54, 55 in said equatorial plane P_EQ.

[0121] Preferably, the core 10 comprises an even number of sectors 54, 55, for example between six sectors 54, 55 and twenty sectors 54, 55, preferably ten sectors 54, 55 as illustrated in Figures 2 and 3, to form an annular assembly which covers the entire 360 ​​degrees in azimuth around the central axis Z10.

[0122] Half of said even number of sectors, here therefore preferably five sectors 54, form sectors 54 called "keys" which are designed to be accessible by radially internal approach and to be removed first during disassembly of said annular assembly, each in its own individual extraction direction D extract radial, and the other half of said number of sectors, here therefore preferably five sectors 55, form, alternating with the keys 54, sectors 55 called "vaults" which are supported and locked in position by the keys 54 and designed to become maneuverable, each in its own individual extraction direction D extract radial, after said vaults 55 have been released by the removal of the keys 54.

[0123] Each of said sectors 54, 55 comprises its own set of grooves 12, which are arranged in accordance with the radially extractable configuration defined from the individual extraction direction D extract of the sector 54, 55 considered.

[0124] As indicated above, each sector 54, 55 preferably extends, over its individual angular range A54, A55, in a single block over the entire axial width of the cavity 4, and therefore comprises for this purpose a first lobe 17 and a second lobe 18, connected to each other by a bridge which crosses the equatorial plane P_EQ and which forms the solid central band 56 mentioned above.

[0125] The total number of sectors 54, 55 constituting the core 10, here for example twenty sectors, or more preferably ten sectors as illustrated in figures 2, 3, 14 and 15, results from a compromise between on the one hand the simplicity of the core 10, the simplicity and compactness of the operating members making it possible to move the sectors 54, 55, and the speed of the demolding operation, which encourage reducing the number of sectors 54, 55, and on the other hand the technical feasibility of the joint planes between neighboring sectors 54, 55, and more particularly the feasibility of the faces limiting the keys 54 which are generated according to planes parallel to the individual extraction direction D extract of said keys 54, and more generally the possibility of radially extracting the sectors 54, 55 without interfering with the neighboring sectors, which encourages maintaining an azimuthal splitting of the core 10 into a number sufficiently high of sectors 54, 55.

[0126] It will be noted in this respect that the joint planes belonging to a key 54 will advantageously be generated by using as generator the individual extraction direction D extract of the key 54 considered, so that the intersection of said joint planes with the curved receiving surface 10 will present, in projection in a plane normal to the central axis Z10, a curved shape, and, in view from the summit zone 51, a chevron appearance.

[0127] The sectors 54, 55 are furthermore preferably equipped with fixing shanks 57, which fixing shanks 57 may for example have T-shaped or dovetail-shaped grooves, and allow an operating mechanism (not shown) to engage on said sectors 54, 55, in order to be able to support and move said sectors 54, 55.

[0128] Said operating mechanism will be capable of deploying and supporting said sectors 54, 55 in an annular assembly forming the core 10 during the operation of making the bandage 40, and if necessary during the operation of baking the bandage, then of retracting the sectors 54, 55 and of extracting said sectors 54, 55 from the bandage 40 during the demolding operation.

[0129] The operating mechanism may comprise a bundle of axial rods, called “daggers”, which will engage the fixing tails 57, at the rate of one rod per sector 54, 55, in order to carry and be able to transport said sectors 54, 55.

[0130] Each of these rods will advantageously be movable, independently of the other rods, on the one hand in radial translation, and on the other hand in axial translation relative to a gripper, such as a gripper ring, designed to grip and hold the bandage 40 from the outside.

[0131] The rods will thus first be able to move axially to each engage the fixing tail 57 of a sector 54, 55, and lock with said sector 54, 55.

[0132] Then sectors 54, 55 can be removed one after the other, here first keys 54 one after the other, then vaults 55 one after the other.

[0133] To do this, each rod will in turn first execute a centripetal radial movement, according to the individual extraction direction D extract of the corresponding sector, to extract said sector 54, 55 from the cavity of the bandage, then an axial recoil movement to release said sector 54, 55 from the axial range occupied by the bandage 40, then, preferably, a centrifugal radial movement to leave the space necessary for the execution of the movements of the following rods, and therefore for the execution of the extraction movements of the following sectors 54, 55.

[0134] The reconstitution of the core 10 for the purpose of manufacturing a new bandage 40 will be obtained by carrying out the above movements in reverse order, in order to reassemble the sectors 54, 55 into an annular core 10.

[0135] All the above-mentioned movements may be guided by suitable guiding means, in particular translational guide rails, and motorized by any suitable motors, preferably electric motors.

[0136] A suitable control unit, such as an electronic control unit, will make it possible to control, coordinate and automate said movements, and in particular to control, during the demolding step, the centripetal radial retraction of the keys 54, one by one or all simultaneously, initially, before triggering and controlling the centripetal radial retraction of the vaults 55, in a second step.

[0137] Furthermore, according to a preferred characteristic which may constitute an invention in its own right, at least one of the grooves 12, and more particularly at least one of the grooves 12 arranged according to the radially extractable configuration, and preferably each of the grooves 12 of the sector 54, 55 considered, comprises a compensator 20 which comprises a stop 21 which creates inside the groove 12 a point called “intermediate passage point” M3 which is located outside the base line D0, so that the length L5_tot of the path followed by the stay 5 in the groove 12, from the first anchoring point M1 to the second anchoring point M2 via the intermediate passage point M3 defined by the stop 21, is strictly greater than the distance called “base distance L0” which separates, in a straight line, the second anchoring point M2 from the first anchoring point M1,which allows the compensator 20 to constitute a reserve of stay length which can be mobilized to allow the side 44, 45 or the heel 42, 43 containing the second anchoring point M2 to be moved away from the top 41 containing the first anchoring point M1 when the sector 54, 55 concerned is extracted from the cavity 4 according to the individual extraction direction D extract.,

[0138] Indeed, as indicated above, the first heel 42 and the second heel 43 preferably form, in section in a radial plane containing the central axis Z10, and with respect to the axially widest part of the cavity 4, a constriction, so that the first flank 44 and the second flank 45 form undercut faces with respect to the individual extraction direction D extract of the sector 54, 55 considered, here more particularly with respect to the individual extraction direction D extract which is perpendicular to the central axis Z10 and contained in the bisector meridian plane P MER BISECTOR of the sector 54, 55 considered.

[0139] In this case, the demolding operation requires axially separating the first heel 42 and the second heel 43 from each other, to allow the passage of the sector 54, 55 which it is desired to extract from the cavity 4 of the bandage 40.

[0140] In this respect, the separation of the beads 42, 43 can be caused simply by forcing the elastic deformation of the first and second flanks 44, 45 of the tire under the effect of the thrust of the first and second lobes 17, 18 of the sector 54, 55 which executes the centripetal radial extraction movement, relative to the tire 40, in the individual extraction direction D extract. In this case, the first and second flanks 44, 45 and / or the first and second beads 42, 43 can slide on the lobes 17, 18, remaining in contact with the receiving surface 10 out, at least at the start of the extraction movement, as illustrated in FIG. 17.

[0141] Optionally, it could be envisaged to actively detach the first heel 42 from the first lateral zone 52 of the receiving surface 10 out while, simultaneously, detaching the second heel 43 from the second lateral zone 53 of the receiving surface 10 out, by exerting on said first and second heels 42, 43 opposite traction forces, in order to open a passage of suitable width in front of the sector 54, 55 concerned. For this purpose, it would be possible, for example, to force the separation of the heels using a suitable traction tool, distinct from the sector 54, 55 considered and engaging on said heels 42, 43.

[0142] It will also be noted that, due to the continuity of material of each of the first and second heels 42, 43 around the central axis Z 10, the fact of locally moving a heel 42, 43 away from the position that said heel 42, 43 initially occupies on the receiving surface 10_out of the core, in the angular range A54, A55 corresponding to the sector 54, 55 that it is desired to extract from the cavity 4 of the bandage 40, also has the effect of moving this same heel 42, 43 away from the receiving surface 10_out in the neighboring sectors 54, 55, as illustrated in FIG. 20.

[0143] Of course, the spacing of the heels 42, 43, regardless of how the spacing is caused or regardless of the sector 54, 55 affected by said spacing, must not cause any damage to the bandage 40 or to the stays 5. In particular, the spacing of the heels 42, 43 must not cause any weakening or tensile breakage of the stays 5, nor tearing of their anchor points M1, M2.

[0144] Now, advantageously, the compensator 20 is capable of restoring, when necessary, all or part of the reserve of stay length that said compensator 20 has constituted within the groove 12, and thus allows all the stays 5 concerned to adapt without damage to the variations, and more specifically to the increases, of the distance which separates the first and second anchoring points M1, M2, variations which are induced by the displacement of the heel 42, 43 concerned.

[0145] This compensation, and more particularly the unfolding of the stay 5, can advantageously occur in the sector 54, 55 which executes the demolding movement in the individual extraction direction D extract, while the top zone 51 of said sector 54, 55 detaches and moves away from the internal surface 3_in of the top 41 of the bandage, as illustrated in FIG. 17, but also in the sectors 55, 54 which are immediately adjacent to said sector executing the demolding movement, while said neighboring sectors 55, 54 are still in place in the cavity 4 of the bandage, the top zone 51 of each of said neighboring sectors 54, 55 still being in contact with the internal surface 3_in at the top 41 of the bandage, but the heels 42, 43 of said neighboring sectors 55, 54 are separated and thus detached from the lateral zones 52, 53 of the receiving surface 10 out, as illustrated in Figure 20.

[0146] The stay length reserve Delta L is equal to the difference between, on the one hand, the length L5_tot of the path initially followed by the stay 5 in the groove 12, from the first anchor point M1 to the second anchor point M2 via the intermediate passage point M3 defined by the stop 21, and on the other hand the basic distance L0: Delta L = L5_tot - L0

[0147] Preferably, after the stay 5 has been placed in the groove 12, during which a slight longitudinal pull is exerted on the stay 5, a triangular configuration is obtained, in which the stay 5 is stretched so as to form rectilinear segments from the first anchoring point M1 to the intermediate passage point M3 first, then from the intermediate passage point M3 to the second anchoring point M2, as can be seen in Figure 16. The compensator 20 thus allows the geometric creation of a triangle M1M2M3 whose first anchor point M1 and second anchor point M2 respectively form a first vertex and a second vertex which define the base [M1M2] of said triangle, and whose intermediate passage point M3 defined by the stop forms the third vertex.

[0148] The maximum available stay length reserve Delta L is then, in absolute terms, the difference between, on the one hand, the cumulative length of the two pieces of stay forming the short sides [M1M3] and [M3M2] of the triangle and, on the other hand, the initial length of the base [M1M2] of the triangle, it being recalled that said initial length of the base [M1M2] is the base distance LO as defined by the shape and dimensions of the core 10 and which separates the first anchoring point M1 located in the first wall portion 31, here the apex 41, from the second anchoring point M2 located in the second wall portion 32, here one of the first and second flanks 44, 45 or one of the first and second heels 42, 43, when said first and second wall portions 31, 32 match the receiving surface 10 out of said core 10.

[0149] Preferably, said stay length reserve Delta L is between 3% and 30%, preferably between 8% and 20%, more preferably between 10% and 15%, of the basic distance L0.

[0150] Preferably, alternatively or cumulatively with the relative proportions indicated above, the stay length reserve Delta L may be comprised, in absolute value, between 3 mm, minimum value, and 30 mm, maximum value, for example between 10 mm, minimum value and 18 mm, maximum value, preferably between 12 mm and 15 mm.

[0151] This dimensioning of the Delta L length reserve, and more particularly the low values ​​(minimum values) chosen for said Delta L length reserve, advantageously makes it possible to have sufficient excess stay length 5 in stock in the groove 12, at the end of the manufacturing step and before the possible baking step and the demolding step, that is to say sufficient initial excess stay length, so that the stay 5 can then undergo without damage: - a possible intrinsic shortening of said stay 5 caused by thermal shrinkage, during the baking step, while the first and second anchoring points M1, M2 are held by the core 10 at a fixed distance from each other, in this case at the basic distance LO from each other, and, above all, - an elongation of the effective distance which separates the first and second anchoring points M1, M2, caused by the forced separation of the first and second wall portions 31, 32, when at least one of said first and second wall portions 31, 32 is detached and separated from the receiving surface 10 out of the core 10 during the demolding step, and in particular when the first heel 42 and the second heel 43 are axially separated from each other, by detaching them from the first lateral zone 52 and respectively from the second lateral zone 53 of the core 10, to allow the passage of the first and second lobes 17, 18 of the sector 54, 55 concerned in centripetal radial translation according to the individual extraction direction D extract of said sector 54, 55.

[0152] This same dimensioning of the Delta L length reserve, and more particularly the high values ​​(maximum values) chosen for said Delta L length reserve, advantageously make it possible to limit the initial excess length of the stay 5 in such a way that, after the demolding operation, and once the tire 40 has been placed in the functional configuration, here once the tire 40 has been mounted on a mounting support, such as a rim, and once the tire 40 has been inflated by introducing a pressurized fluid into the cavity 4, then the wall 3, and more particularly the first wall portion 3 1 and the second wall portion 3 2, are in a configuration such that the initial excess length of the stay is absorbed, that is to say that the stay 5 extends in a rectilinear manner, and therefore in a substantially taut manner, in the cavity 4, from the first anchoring point M1 to the second anchoring point M2, and can thus perform its stay function,by opposing the relative distance of the first and second anchoring points M1, M2, and therefore by retaining the second portion of wall 32, here a flank 44, 45 or a heel 42, 43, relative to the first portion of wall 31, here the top 41, and vice versa.,

[0153] Particularly preferably, the stop 21 is adaptive, in that said stop 21 allows a variation in the position of the intermediate passage point M3 within the groove 12 in reaction to a variation in the intensity of the longitudinal tension which prevails in the stay 5, between the first anchoring point M1 and the second anchoring point M2.

[0154] This adaptive character may in particular be obtained by giving the stop 21 elastic behavior.

[0155] According to one possible implementation, this elastic behavior will allow the stop 21 to operate by a threshold effect, according to which said stop 21, depending on the stresses exerted on the stay 5, will be able to alternately either retain the stay 5 at an intermediate passage point M3, by resisting the movement of the stay 5, or on the contrary, by elastically retracting under the effect of a stress greater than a predetermined threshold, release and / or allow the stay 5 to pass to allow the latter to modify its position in response to the stress.

[0156] It would thus be possible, for example, to provide a stop 21 in the form of a curved leaf spring, which would have a sole, fixed to a first side wall 15 delimiting the groove 12, and an arch carried by the sole and forming a bulge in the direction of a second side wall 16 delimiting the groove 12, opposite the first side wall 15, so that said arch, elastically deformable and forming at rest with the second side wall 16 a constriction which is narrower than the transverse dimension of the stay 5, could stop the sinking of the stay 5 into the groove 12 at the intermediate passage point M3, or even maintain the stay 5 at the intermediate passage point M3 by elastic pinching between the arch and the second side wall 16, and, when sufficiently intense traction is exerted on the stay 5, release said stay 5 and / or allow said stay 5 to cross the constriction, either to sink deeper into the groove 12,either to extract itself from said groove 12.,

[0157] However, according to another preferred implementation possibility, as can be seen in figures 16, 17 and 18, the stop 21, which is preferably formed by a ball 23, is mounted movably in the groove 12 and supported by an elastic member 22, preferably a helical spring 27, so that the stop 21 is capable of ensuring elastic suspension of the stay 5 housed in the groove 12.

[0158] Advantageously, the elastic member 22 is capable of deforming elastically against the force which results, at the intermediate passage point M3, from a traction which is exerted on the stay 5 at the level of the first and second anchoring points M1, M2, which thus allows the stop 21, and therefore at the intermediate passage point M3, to move at the within the groove 12, and consequently allows the stay 5 to unfold to the extent necessary to adapt at any time to the spacing distance which separates the first anchor point M1 from the second anchor point M2.

[0159] In particular, the stop 21, here the ball 23, will thus be able to push against the elastic member 22, here by compressing the spring 27, to reduce the height of the triangle M1M2M3 and thus increase the length of the base [M1M2], as illustrated in figure 17.

[0160] Furthermore, such an elastic suspension advantageously makes it possible to maintain the stay 5 in tension between the first anchoring point M1 and the intermediate passage point M3 on the one hand, and between the intermediate passage point M3 and the second anchoring point M2 on the other hand, and therefore to maintain a stay 5 which is rectilinear in each piece, on each of the two sides [M1M3], [M3 M2] of the triangle.

[0161] This advantageously makes it possible to order the stay 5 within the groove 12, both during the manufacturing step, including the installation of the stay 5 then the installation of the components constituting the wall 3 of the bandage 40, and during at least part of the demolding operation. By avoiding having a loose or disordered stay 5 within the groove 2, any risk of jamming or tangling of the stay 5 is advantageously avoided, in particular during the demolding step.

[0162] Preferably, as can be seen in figures 15 to 17, the compensator 20 comprises a cartridge 30 which is inserted removably into the core 10, and more particularly into the sector 54, 55 concerned, in a direction which is transverse to the side walls 15, 16 delimiting the groove 12.

[0163] Said cartridge 30 comprises a plurality of chambers 24 each containing a stop 21, here a ball 23, which is captive in said chamber 24, which is slidably mounted in said chamber 24 and which is moved by an elastic member 22, here a helical spring 27. Each chamber 24 is provided with a slot 25 which is arranged to align with the corresponding groove 12 in order to allow the stay 5 concerned to reach the stop 21 located in said chamber 24.

[0164] Within each chamber 24, the elastic member 22 pushes the stop 21 towards the slot 25, against the stay 5, as illustrated in Figure 17, and, in the absence sufficient force exerted by the stay 5, presses the stop 21 against the bottom of the chamber 24, as can be seen in figure 18.

[0165] The direction D21 of movement of the stop 21, and more particularly the direction of translation of the cursor formed here by the ball 23, such that this direction of translation is defined by the chamber 24, is preferably parallel to the gauge planes PG1, PG2, here therefore parallel to the side walls 15, 16 of the groove 12, and, in consideration in a radial plane passing through the bottom 13 of the groove, perpendicular or substantially perpendicular (at + / - 5 degrees, for example) to the bottom 13 of the groove 12, and therefore here preferably substantially perpendicular to the base line DO.

[0166] The invention of course relates as such to a method of manufacturing a bandage 40 during which a tool 1 according to the invention is used.

[0167] According to this method, a stay 5 is placed in each groove 12 of the core 10 that is desired, then at least one elastomer-based component is placed on the receiving surface 10 to form the crown 41, the first and second flanks 44, 45 and the first and second heels 42, 43 of the bandage, then the bandage 40 is demolded by moving the sectors 54, 55 constituting the core, each according to a centripetal radial movement carried by the individual extraction direction D extract specific to the sector 54, 55 concerned, in order to extract each sector 54, 55 from the cavity 4 of the bandage 40 while leaving the stays 5 in place in the cavity 4 of the bandage 40.

[0168] More particularly, we begin by assembling the core 10 by deploying and suitably positioning the sectors 54, 55, here first the vaults 55 then the keys 24 which will, by a centrifugal radial deployment movement, each fit between two vaults 55, so that we obtain an annular core 10.

[0169] The actual manufacturing step will preferably comprise a first preparation phase, during which annular anchoring structures based on raw rubber, such as strips of raw rubber, forming adhesive strips, are placed on the receiving surface 10 out, including an annular anchoring structure on each of the first and second lateral zones 52, 53, in the immediate vicinity of the second mouth portions 14B of the grooves 12, and at least one third annular anchoring structure on the summit zone 51, here on the solid central band 56 which crosses the equatorial plane P_EQ, in the immediate vicinity of the first mouth portions 14A of the grooves 12.

[0170] When installing the stays 5, portions of said stays 5 will be pressed against said annular anchoring structures, to adhere to said anchoring structures, typically by penetrating into the raw rubber strips, so that said anchoring structures will thus ensure that said stays 5 are held in position during the operation of installing said stays 5 and then during the operation of putting in place the constituent elements of the rest of the wall 3 of the bandage 40. Said annular anchoring structures will advantageously permanently integrate the bandage 40 thus manufactured.

[0171] The manufacturing stage continues with a phase of installing the stays 5, which can be carried out in a manner quite similar to that described in application WO-2022 / 200718 mentioned in the preamble.

[0172] Preferably, the same continuous reinforcing wire 70 is used to form several stays 5, preferably all the stays 5, by arranging said continuous reinforcing wire 70 in a serpentine fashion through the successive grooves 12, as illustrated in FIGS. 13 and 16.

[0173] To this end, the wire 70 is pressed against the first anchoring structure located in the first lateral zone 52, to form a lateral anchoring point M2, then, while exerting a slight longitudinal tension on the wire 70, said wire 70 is inserted into a first groove 12, under the receiving surface 10 out, so that said wire 70 passes through the inside of the first lobe 17 and emerges from said groove 12 in the top zone 51, where said wire 70 is pressed against the top anchoring structure present in the top zone 51 of the receiving surface 10 out, to form a top anchoring point ML. A first stay 5 has thus been produced, housed in said first groove 12.

[0174] After the wire has crossed the equatorial plane P_EQ, the wire 70 is then plunged into a second groove 12 located axially in the extension of the first groove 12, so that said wire 70 crosses the interior of the second lobe 18 and emerges from the second groove 12 in the second lateral zone 53, where said wire 70 is pressed against the second anchoring structure to create a lateral anchoring point M2, and thus form a second stay 5 housed in the second groove 12.

[0175] Said continuous reinforcing wire 70 is thus made to go back and forth in one piece from one lateral zone 52, 53 of the core 10 to the other lateral zone 53, 52, each time passing through the top zone 51, as can be seen in FIG. 13, so as to form alternations.

[0176] In each lateral zone 52, 53, the wire 70 turns back, forming a loop 71 which is pressed into the corresponding anchoring structure before the wire 70 re-enters a groove 12.

[0177] Of course, if a stop 21 is provided in a groove 12, the wire 70 comes to bear on said stop 21, so as to form a fold at the intermediate passage point M3, and thus constitute a reserve of stay length 5 inside the groove 12 concerned, between the first and second side walls 15, 16.

[0178] The manufacturing step then comprises a filling phase during which the components constituting the crown 41, the sides 44, 45 and heels 42, 43 of the bandage 40 are deposited on the receiving surface 10, in order to construct the wall 3 of the bandage 40.

[0179] Said components will preferably comprise rubber-based strips or sheets, possibly reinforced by longitudinal reinforcing threads, made of textile, polymer, or metal. Other reinforcing components may be provided, such as composite strips based on fiberglass and resin.

[0180] All or part of said components may preferably be placed by winding on the core 10, which may for this purpose be rotated around its central axis Z 10.

[0181] The process then includes, after the preparation step, a cooking step.

[0182] During this process, the core 10 and the bandage 40 carried by said core 10 are placed in a baking mold, in order to vulcanize the components of the rubber-based bandage 40. For this purpose, the temperature of the mold, and more particularly of the bandage, will preferably be brought to a value between 120°C and 200°C.

[0183] As an alternative to the aforementioned filling phase and cooking step, it could be envisaged to produce all or part of the top 41, the sides 44, 45 and / or the heels 42, 43 of the bandage 40 by injection of a thermoplastic elastomer material, after having dressed the core 10, carrying the stays 5, by means of a suitable injection mold.

[0184] The cooking step will then be replaced by a cooling step to bring the thermoplastic elastomer material to a solid and elastic state.

[0185] It is of course possible to envisage a mixed process, combining a filling phase where solid rubber-based elements are placed on the core 10, and a thermoplastic elastomer material injection phase. The curing step could then occur before, simultaneously with, or after the thermoplastic elastomer material injection phase.

[0186] In all cases, the method then comprises, once the bandage 40 has been produced, a demolding step during which the core 10 is removed from the bandage 40 while leaving the stays 5 in place in the cavity 4 of said bandage 40, as is notably illustrated in the sequence of figures 16, 17 and 18.

[0187] To do this, we begin by releasing at least one key 54, preferably automatically by means of the operating mechanism described above, according to a centripetal radial movement oriented perpendicular to the central axis Z 10, in accordance with the individual extraction direction D extract of the key 54 concerned, and as illustrated in Figures 14 and 15.

[0188] In doing so, the stays 5 which are initially contained in the grooves 12 of said key 54, and which are retained by the bandage 40 at their respective anchoring points M1, M2, will slide freely along the grooves 12 without encountering any obstacle, between the first and second side walls 15, 16, following a trajectory carried by the individual extraction direction D extract and directed from the bottom 13 of the groove 12 towards the mouth 14 of said groove, from a location radially internal to the key 54, situated in the reserved volume 11, to a position radially external to said key 54, situated outside the reserved volume 11.

[0189] If, during this extraction movement, the first and second lobes 17, 18 of the key 54 force the axial separation of the flanks 44, 45 and the heels 42, 43, by elastic deflection of the flanks 44, 45, the compensators 20 release all or part of the excess length of stay 5 stored in the grooves 12, to allow each stay 5 to accompany without damage the temporary increase in the distance which separates its two anchor points M1, M2, as illustrated in figure 17.

[0190] The key 54 continues its radial movement towards the central axis Z10 according to the individual extraction direction D extract until it is completely clear of the cavity 4, and more particularly until the top zone 51 of the receiving surface 10 out is at a radial distance from the central axis Z10 which is strictly less than the radius of the radially internal limit of the heels 42, 43, as illustrated in Figure 18.

[0191] We can then act in the same way with the other keys 54, then with the vaults 55, the description above applying mutatis mutandis, to completely release the bandage 40, cooked, provided with its stays 5.

[0192] Of course, the invention is in no way limited to the variants described above, the person skilled in the art being able to isolate or freely combine the above-mentioned characteristics or to substitute equivalents for them.

Claims

CLAIMS 1. Tooling (1) intended for the manufacture of a toroidal bandage (40), said tooling comprising a core (10) which materializes a volume called "reserved volume" (11) corresponding to a cavity (4) of the bandage (40), said core (10) being delimited externally by a convex toroidal surface called "receiving surface" (10 out) which is centered on a central axis (Z 10) and which comprises a radially external top zone (51), intended to receive components constituting the crown (41) of the bandage (40), and, on either side axially of said top zone (51), a first lateral zone (52) folded towards the central axis (Z10) and intended to receive components constituting a first sidewall (44) and a first bead (42) of the bandage (40), as well as a second lateral zone (53) folded towards the central axis (Z10) and intended to receive components constituting a second sidewall (45) and a second heel (43) of the bandage,said core (10) further comprising a plurality of grooves (12) which are distributed in azimuth around the central axis (Z10) and hollowed out inside the reserved volume (11), from the receiving surface (10 out), so that each of said grooves (12) has a mouth (14) which extends continuously, along the profile of the receiving surface (10 out), from a first mouth portion (14A) located in the top zone (51) to a second mouth portion (14B) located in one of the first and second lateral zones (52, 53) and that each of said grooves (12) forms a housing which is delimited, in azimuth around the central axis (Z10), by a first lateral wall (15) and by a second lateral wall (16) which are distant from each other in azimuth and which are both intersecting with the receiving surface (10 out), so that each groove (12) is capable of receiving, inside the housing,between the first side wall (15) and the second side wall (16), a filiform reinforcing element (5), called a "stay" (5), which enters said groove (12) through the first mouth portion (14A) and emerges from said groove (12) through the second mouth portion (14B), said stay (5) being designed to permanently integrate the structure of the bandage (40) and extend through the cavity (4) of the bandage (40) by connecting a first anchoring point (M1), called the "top anchoring point" (M1), located in the top (41) of the bandage (40), to a second anchoring point (M2), called the "lateral anchoring point" (M2), located in one of the first and second flanks (44, 45) or one of the first and, second heels (42, 43) of the bandage (40), said tooling (1) being characterized in that the core (10) is subdivided, in azimuth around the central axis (Z10), into a succession of sectors (54, 55) which each cover a predetermined azimuthal angular range (A54, A55), called "individual angular range" (A54, A55), around said central axis (Z 10), at least one of said sectors (54, 55), and preferably each of said sectors (54, 55), being arranged so as to be able to be moved relative to the neighboring sectors (55, 54), in order to be released from the bandage (40), in a direction called "individual extraction direction" (D extract) which belongs to the individual angular range (A54, A55) occupied by said sector (54, 55) and which is perpendicular to the central axis (Z 10), and in that several grooves (12), preferably all the grooves (12), belonging to this same sector (54,55) are arranged according to a configuration called "radially extractable configuration" according to which, in projection in a plane called "reference tangent plane" (P REF) which is normal to the individual extraction direction (D extract) of the sector (54, 55) considered and which is tangent to the radially outermost part of the summit zone (51) of the receiving surface (10 out) of said sector (54, 55) considered, the first lateral wall (15) of each of said several grooves (12) is located on a first side of, and at a distance from, the fictitious straight line called "base straight line" (D0) which passes through the first anchoring point (M1) and through the second anchoring point (M2) of the stay (5) which is housed in the groove (12) concerned, while the second lateral wall (16) is located on the second side, opposite the first side, of the base straight line (D0), and at a distance of said base line (D0), so that said first and second side walls (15,16) do not interfere with the volume swept by the stay (5) when said stay (5) is aligned, in orthogonal projection in the reference tangent plane (P REF), with the base line (D0) and when a relative movement carried by the individual extraction direction (D extract) of said sector is created between the stay (5) and the sector (54, 55).

2. Tooling according to claim 1 characterized in that the individual extraction direction (D extract) is contained in the meridian plane which forms the bisector plane (P MER BISECTOR) of the sector (54, 55) considered.

3. Tooling according to one of the preceding claims, characterized in that the sector (54, 55) in question comprises on the one hand a first convex lobe (17) which extends from the top zone (51) to the first lateral zone (52) and which comprises a first set of grooves (12) and on the other hand a second convex lobe (18) which extends from the top zone (51) to the second lateral zone (53) and which comprises a second set of grooves (12), in that the first lobe (17) and the second lobe (18) are integral with each other, preferably formed in one piece with each other, so as to form a subassembly which is movable as a whole in the individual extraction direction (D extract) of said sector (54, 55) in question, and in that the first set of grooves (12) and the second set of grooves (12) are arranged in accordance with the same radially extractable configuration defined from said individual extraction direction (D extract).

4. Tooling according to one of the preceding claims, characterized in that each groove (12) which is arranged in accordance with the radially extractable configuration leaves free, in the entire portion of the reserved volume (11) which extends from the location provided for the stay (5) inside said groove (12) to the mouth (14) of said groove (12), a free space called "useful passage" (19) which extends from a first fictitious gauge plane (PG1) which is parallel to the individual extraction direction (D extract) and parallel to the base line (DO), and located at a distance from said base line (DO) on one side of said base line (DO) so as to be tangent to the first side wall (15), to a second fictitious gauge plane (PG2) which is also parallel to the individual extraction direction (D extract) and parallel to the base line (DO), so that said second gauge plane (PG2) extends parallel to the first gauge plane (PG1),said second gauge plane (PG2) being located at a distance from said base line (DO) on the other side of said base line (DO) so as to be tangent to the second side wall (16), and in that the distance (W19) which separates the second gauge plane (PG2) from the first gauge plane (PG1), called “useful passage width” (W19), is between 0.3 mm and 3 mm, preferably between 0.8 mm and 2.2 mm, for example between 1 mm and 1.8 mm, or even between 1.1 mm and 1.3 mm., 5. Tooling according to one of the preceding claims, characterized in that the first side wall (15) and the second side wall (16) of at least one groove (12) arranged according to the radially extractable configuration, and preferably of each of the grooves (12) arranged according to the radially extractable configuration, are flat and extend parallel to each other and parallel to the individual extraction direction (D extract).

6. Tooling according to one of the preceding claims, characterized in that, for several, preferably for each, grooves (12) which are arranged in accordance with the radially extractable configuration, the first anchoring point (M1) and the second anchoring point (M2) of the same groove (12) are located at the same azimuthal position around the central axis (Z 10).

7. Tooling according to one of the preceding claims, characterized in that the angular repetition pitch (K12) which separates in azimuth two successive first anchoring points (Ml), defining, within the same sector (54, 55), two successive grooves (12) arranged in accordance with the radially extractable configuration, is between 0.75 degrees and 3 degrees, preferably between 1 degree and 2 degrees, for example preferably equal to 1.5 degrees.

8. Tooling according to one of the preceding claims, characterized in that the individual angular range (A54, A55) covered by each sector (54, 55) is between 5 degrees and 90 degrees.

9. Tooling according to one of the preceding claims, characterized in that the core (10) comprises an even number of sectors (54, 55), preferably ten sectors (54, 55), to form an annular assembly which covers the entire 360 degrees in azimuth around the central axis (Z 10), of which half of said even number of sectors, preferably five sectors (54), form sectors (54) called "keys" which are designed to be accessible by radially internal approach and to be removed first during disassembly of said annular assembly, each according to its own individual radial extraction direction (D extract), and the other half of which, preferably five sectors (55), form, alternating with the keys (54), sectors (55) called "vaults" which are supported and locked in position by the keys (54) and designed to become maneuverable, each according to its own individual radial extraction direction (D extract), after said vaults (55) have been released by the withdrawal of the keys (54), each of said sectors (54, 55) comprising its own set of grooves (12) arranged in accordance with the radially extractable configuration defined from the individual extraction direction (D extract) of the sector (54, 55) considered.

10. Tooling according to one of the preceding claims, characterized in that at least one of the grooves (12) comprises a compensator (20) which comprises a stop (21) which is intended to cooperate with the stay (5) and which creates, inside the groove (12), a point called the “intermediate passage point” (M3) which is located outside the base line (DO), so that the length (L5_tot) of the path followed by the stay (5) in the groove (12), from the first anchoring point (M1) to the second anchoring point (M2) via the intermediate passage point (M3) defined by the stop (21), is strictly greater than the distance called the “base distance (LO)” which separates, in a straight line, the second anchoring point (M2) from the first anchoring point (M1), which allows the compensator (20) to constitute a reserve of stay length which is mobilizable to allow the flank (44, 45) or the heel (42,43) containing the second anchoring point (M2) to be moved away from the vertex (41) containing the first anchoring point (Ml) when the sector (54, 55) concerned is extracted from the cavity (4) according to the individual extraction direction (D extract)., 11. Tooling according to claim 10 characterized in that the stop (21), preferably formed by a ball (23), is mounted movably in the groove (12) and supported by an elastic member (22), preferably a helical spring (27), so that the stop (21) is capable of ensuring elastic suspension of the stay (5) housed in the groove (12).

12. Method for manufacturing a bandage (40) during which a tool (1) according to any one of the preceding claims is used, a stay (5) is placed in each groove (12) of the core (10) that is desired, then at least one elastomer-based component is placed on the receiving surface (10 out) to form the crown (41), the first and second flanks (44, 45) and the first and second heels (42, 43) of the bandage, then the bandage (40) is demolded by moving the sectors (54, 55) constituting the core, each according to a centripetal radial movement carried by the individual extraction direction (D extract) specific to the sector (54, 55) concerned, in order to extract each sector (54, 55) from the cavity (4) of the bandage (40) while leaving the stays (5) in place in the cavity (4) of the bandage (40).

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