CORE FOR THE MANUFACTURE OF A REINFORCED BANDAGE WITH GUARDS, FEATURING A STOP COMPENSATOR INTENDED TO FACILITATE BANDAGE DEMOLDING

Abstract

The present invention relates to a tool (1) for manufacturing an object (2), such as a pneumatic tire, which comprises a wall (3) which delimits a cavity (4) and at least one stay which passes through the interior of the cavity (4) so ​​as to connect a first anchor point (M1) located in a first portion (3_1) of the wall (3) to a second anchor point (M2) which is located in a second portion (3_2) of the wall (3), said tool (1) comprising a core (10) provided with at least one groove (12) receiving the stay (5), and a compensator (20) which includes a stop (21), preferably formed by a finger (70) with a spherical tip (71) forming a constriction (60) intended to pinch the stay (5),to create a reserve of guy wire length that can be mobilized to allow the second portion (3_2) of the wall containing the second anchor point (M2) to move away from the first portion (3_1) of the wall containing the first anchor point (M1) when the core (10) is extracted from the cavity (4). Figure 17,

Description

Title of the invention: CORE FOR THE MANUFACTURE OF A STRAP-REINFORCED BANDAGE FEATURING A STOP COMPENSATOR INTENDED TO FACILITATE BANDAGE DEMOLDING

[0001] The present invention relates to the general field of manufacturing objects using a molding core, in particular rubber-based objects, which objects comprise on the one hand a wall that delimits a cavity and on the other hand wire reinforcements forming guy wires that extend through the cavity of the object in order to connect one portion of the wall to another portion of the wall.

[0002] The present invention relates more particularly to the manufacture of pneumatic tires which, in order to improve their drift behavior, are provided with stays which extend within the toroidal inflation cavity which is delimited by the tire, and which each connect a first anchor point located in the top of the tire to a second anchor point located in the sidewall or in the heel of the tire.

[0003] To manufacture such stay bandages, the applicant has already proposed, in application WO-2022 / 200718, a manufacturing tool comprising a toroidal core which has a shape conjugate to that of the wall delimiting the cavity of the bandage, and in which grooves adapted to the passage of the stays are cut.

[0004] Although such tooling generally gives satisfactory results, the inventors have nevertheless found that the demolding stage, during which the core is extracted from the cavity of the bandage after the said bandage has been cooked, could present a certain complexity, in particular with regard to the need to subdivide the core into a plurality of elements, and to move these different elements successively along particular demolding trajectories to avoid any damage to the stays.

[0005] The objects assigned to the invention therefore aim to remedy the aforementioned drawbacks and to provide an improved manufacturing tool that makes it possible to manufacture an object reinforced by guy wires while simplifying the demolding of said object.

[0006] The objects assigned to the invention are achieved by means of a tool for manufacturing an object, such as a pneumatic tire, which comprises, on the one hand, a wall having a concave internal surface delimiting a cavity, and on the other hand, at least one wire-like reinforcing element, called a "stay," which passes through the interior of the cavity so as to connect a first anchor point located in a first portion of the wall to a second anchor point located in a second portion of the wall, at a non-zero distance from the first anchor point, said tool comprising a core which materializes a volume called the "reserved volume" which corresponds to the cavity of the object and which is delimited by a convex external surface, called the "receiving surface", which receiving surface has a shape conjugate to the internal surface of the wall of the object, is intended to receive one or more constituent components of said wall of the object, and thus determines a distance called the "base distance" between the first anchor point and the second anchor point, said core further comprising at least one groove which is cut inside the reserved volume, from the receiving surface, so as to accommodate the guy wire, said tooling being characterized in that it comprises a compensator which has a stop which is intended to cooperate with the guy wire and which creates, inside the groove, a point called the "intermediate passage point" which is located outside the fictitious line, called the "base line",which passes through the first anchor point and the second anchor point, so that the length of the path followed by the guy wire in the groove, from the first anchor point to the second anchor point via the intermediate passage point defined by the stop, is strictly greater than the basic distance, which allows the compensator to have a reserve of guy wire length which can be mobilized to allow the second portion of the wall containing the second anchor point to move away from the first portion of the wall containing the first anchor point when the core is extracted from the cavity,

[0007] Advantageously, the stop according to the invention allows the compensator to deflect the stay, during the initial insertion of said stay into the groove, from the most direct path that the stay could theoretically adopt, in the absence of a stop, between the first anchor point and the second anchor point.

[0008] The compensator thus stores in the groove an excess of stay length which corresponds to the difference between on the one hand the length of the effective path of the stay passing through the intermediate passage point created by the stop and on the other hand the minimum theoretical length, called "base distance", which the said stay would travel if the said stay followed a straight, direct path through the groove, between the first anchor point and the second anchor point, without making a detour through the intermediate passage point.

[0009] Advantageously, this excess length forms a reserve of stay which is available in particular at the time of demolding, and which allows the stay to accompany, without damage to said stay, a spreading movement by which the first portion of the wall of the object, containing the anchoring point, is spread apart from the second portion of the wall of the object, in order to open the cavity more widely and thus allow the extraction of the core out of said cavity.

[0010] Thus, the temporary increase, during demolding, of the distance separating the first anchor point from the second anchor point can be compensated by the compensator according to the invention.

[0011] More generally, the configuration conferred by the stop on the path followed by the stay advantageously allows the stay to be "unfolded" or "straightened" when the first anchor point moves away from the second anchor point, and thus to geometrically bring the path actually followed by the stay closer to a straight path, here to geometrically bring the path actually followed by the stay closer to the fictitious line which joins, at the moment considered, and in particular at the time of demolding, the first anchor point to the second anchor point.

[0012] The compensator is thus able to "give slack" to the stay to adapt to the spacing required between the anchor points, at each instant considered, the apparent length of said stay which corresponds to the length measured, at the instant considered, in a straight line between the two ends of the stay formed by the anchor points, that is to say the length of the base of the fictitious triangle whose vertices are formed respectively by the first anchor point, the second anchor point, and the intermediate passage point.

[0013] The compensator according to the invention thus prevents the stay from being damaged or even broken under the tensile stress to which its anchor points subject it during demolding.

[0014] Advantageously, the implementation of a compensator according to the invention makes it possible in particular to consider the extraction of the core out of the cavity in an extraction direction in relation to which the wall of the object initially forms an undercut face which, in the absence of a compensator allowing an elongation of the stay, and therefore in the absence of the possibility of separating the portions of the wall of the object from each other, would make the extraction impossible, or at the very least impossible without damaging or even breaking the stay.

[0015] It will be noted that, preferably, the stop will be mounted movably in the groove and supported by an elastic element, so that said stop is capable of ensuring elastic suspension of the stay housed in the groove.

[0016] Advantageously, such a suspended arrangement makes it possible in particular to compensate, on the occasion of demolding, for the temporary increase in the distance which separates the first anchorage point from the second anchorage point thanks to a movement of the stop which collapses elastically, against the elastic element which supports said stop, under the effect of the tension which is exerted on the stay, and more particularly under the effect of an increase in the tension which is exerted on the stay, when said stay is stressed in tension by its anchorage points.

[0017] More generally, this suspended arrangement allows the guy wire to be "unfolded" or "straightened" when the first anchor point moves away from the second anchor point, thanks to the fact that the intermediate passage point, defined by the movable stop, can be brought closer to the fictitious line which joins, at the moment considered, and in particular at the time of demolding, the first anchor point to the second anchor point, and therefore that the path which is actually followed by the guy wire can be geometrically brought closer to a straight path.

[0018] Other objects, features and advantages of the invention will become apparent in more detail from the following description and with the aid of the accompanying drawings, which are provided by way of illustration only and are not intended to be limiting, among which:

[0019] Fig. 1 illustrates, according to a perspective view with material removal along a radial plane, an example of a guyed pneumatic tire that can be produced using tooling according to the invention.

[0020] Figure 2 illustrates, in an exploded perspective view, an element of a tool allowing the bandage to be applied [Fig.l].

[0021] Figure 3 illustrates, in a detailed cross-sectional view, a stop arrangement, here a suspended stop arrangement, as used in the tooling of [Fig.2], in which the stop is formed by a ball and the elastic element by a helical spring, here stressed in compression.

[0022] Figure 4 illustrates, in cross-section, a possible variant of the arrangement of suspended stop, according to which the stop is formed by a ball and the elastic element by a torsion spring.

[0023] Figure 5 illustrates, according to a partial cross-sectional view in a radial plane, the initial configuration of the stay and the compensator during a step in making the bandage of the [Fig.1], the wall of the bandage conforming to the receiving surface of the core, and the suspended stop, with which each groove considered is equipped, deviating the path followed by the stay to create a reserve of stay length in the groove concerned.

[0024] Figure 6 illustrates, according to a partial cross-sectional view in a radial plane, the The configuration of the stay and the compensator during a demolding step in which the sides and heels of the bandage are spread apart from the top of the bandage. This also has the effect of spreading the heels apart along the central axis of the bandage, allowing the core to be extracted from the bandage cavity in a direction perpendicular to the central axis, through the neck-shaped passage defined by the sides and heels of the bandage. During this step, each relevant stop compresses against its elastic element to allow the stay to unfold, increasing its apparent length and thus adjusting said apparent length to the increasing distance due to the effect of the deflection of the wall which allows the widening of the pass, between the first anchor point located in the summit and the second anchor point located in the flank.

[0025] Fig. 7 illustrates, according to a partial cross-sectional view in a radial plane, the configuration of the stay and the compensator at the end of the demolding step, the core being totally out of the cavity of the bandage, the stay being thus totally out of the groove, and the sides and heels of the bandage having returned to their rest position, while, within the extracted core, the stop is, under the effect of the return exerted by the elastic element, in the rest position that said stop occupies in the absence of a stay pressing on said stop.

[0026] Fig. 8 is a front view, in a plane normal to the central axis of the bandage, of a toroidal core used to manufacture the bandage of Fig. 1 in accordance with the steps illustrated in Figures 5, 6 and 7, said core being subdivided, in azimuth around the central axis, into a succession of sectors forming keys and arches, and said core being here in a configuration which corresponds to the demolding step of a first sector, forming a key, at the moment when said first sector crosses the neck formed by the sides of the bandage which are kept apart.

[0027] Fig. 9 illustrates, according to a partial cross-sectional view in a radial plane, during the demolding stage of a first sector as illustrated in Fig. 6, the configuration of the stays and compensators in a second sector which is still in place within the cavity of the bandage, and which is distinct and immediately adjacent to said first sector.

[0028] Fig. 10 illustrates, in perspective view, a variant of the compensator according to the invention, the stop of which includes a spring-blade which is arranged to form a constriction with one of the lateral walls of the groove in order to be able to, on the one hand, block the stay, or even elastically pinch the stay against said lateral wall of the groove, and thus temporarily hold said stay at the intermediate point of passage, and on the other hand release the stay when it is necessary to give slack in response to a sufficient pull exerted on said stay.

[0029] Fig. 11 is a longitudinal cross-sectional view of the compensator of Fig. 10.

[0030] Fig. 12 illustrates, according to a partial view, the principle of implantation within a core, in two adjacent grooves, of two spring-blade compensators of the type shown in Figures 10 and 11.

[0031] The [Fig. 13] is a cross-sectional view of the installation shown in the [Fig. 12], in a cutting plane containing the longitudinal axis of a compensator, to show the interaction between the spring-blade, the lateral wall of the groove and the stay.

[0032] Fig. 14 illustrates, in perspective view, another variant of compensator according to the invention, comprising a stop which takes the form of a finger provided with a spherical point.

[0033] Fig. 15 illustrates, according to a partial schematic view in exploded perspective, the principle of placement within a core, opposite two adjacent grooves, of two fingers according to Fig. 14, as well as the interaction of said fingers with the corresponding stays.

[0034] Fig. 16 is a cross-sectional view of the implantation shown in Fig. 15, in a cutting plane containing the longitudinal axis of a finger, to show the constriction formed by the spherical tip and the lateral wall of the groove at the desired intermediate passage point, and the corresponding interaction of the stay with the finger.

[0035] Fig. 17 illustrates, according to a partial cross-sectional view in a radial plane, the initial configuration of the stay and a compensator according to figures 10 to 13, during a step in making the bandage of Fig. 1, where the wall of the bandage fits the receiving surface of the core, and the spring-blade stop, with which each groove considered is equipped, retains the stay at the intermediate point of passage so as to deflect the path followed by the stay to create a reserve of stay length in the groove concerned.

[0036] Figure 18 illustrates, in a partial cross-sectional view in the same plane as Figure 17, a first phase of the demolding step, during which the heel of the bandage is forced to flex elastically away from the top of the bandage. This allows the core to begin its radial extraction from the bandage cavity through the neck defined by the heels. As this occurs, the tension exerted on the stay becomes sufficient to force it through the constriction formed by the stop. This releases the stay, allowing it to leave the intermediate point and continue its progression freely towards the bottom of the groove, thus providing slack in the stay. It should be noted that, immediately after being released from the constriction, the stay is advantageously slack, thus fully utilizing the length reserve provided by the compensator.

[0037] Figure 19 illustrates, in a partial cross-sectional view in the same plane as Figures 17 and 18, a second phase of the demolding step, during which the elastic flexing of the sides and heels of the bandage is increased to move them away from the top of the bandage. This has the effect of further separating the heels from each other along the central axis of the bandage, so as to allow the complete extraction of the core from the cavity of the bandage in an extraction direction perpendicular to the central axis, through the neck-shaped passage delimited by the sides and heels of the bandage. In doing so, the stay, substantially taut between the side and the top, passes again through the constriction formed by the stop, in the opposite direction to the previous one, to exit the groove and leave the core.

[0038] The present invention relates to a tool 1 intended to manufacture an object 2, such as for example a pneumatic tire 40 shown in [Fig.1].

[0039] Whatever the nature and purpose of the object 2, the object 2 referred to in the invention comprises, as can be seen in particular in figures 1, 5, 6 and 7, on the one hand a wall 3 which has a concave internal surface 3_in delimiting a cavity 4, and on the other hand at least one wire-like reinforcing element 5, called a "stay" 5, which passes through the interior of the cavity 4 so as to connect a first anchor point M1 located in a first portion 3_1 of the wall 3 to a second anchor point M2 which is located in a second portion 3_2 of the wall 3, at a non-zero distance from the first anchor point M1.

[0040] The stay 5 advantageously forms an integral, permanent part of the structure of the object 2.

[0041] The stay 5 advantageously exhibits a certain degree of flexibility, so as to be able to flex without damage, particularly during the manufacture of the object 2, but near-inextensibility along its length, considered from the first anchor point M1 to the second anchor point M2, so that, once the object 2 has its final 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 straight from the first anchor point M1 to the second anchor point M2, and prevents the second portion 3_2 of the object's wall from deviating from the first portion 3_1 of said object wall, thus stiffening the object 2. As indicated in the preamble, in the case where the object 2 is a pneumatic tire, the presence of the stay reduces the drift phenomenon related to the elasticity of the sides of the bandage.

[0042] Preferably, the stay 5 will be formed from a single-strand or multi-strand yarn made from one or more strands of textile material, polymer material such as aramid, or even metallic material. According to one embodiment, the stay 5 is made from a composite yarn made from glass fibers and resin.

[0043] By way of example, the threadlike nature of the stay 5 is such that the length of the portion of the stay 5 which extends in the cavity 4, that is to say the length of the stay 5 considered along the path formed by the stay 5 from the first anchor point M1 to the second anchor 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, that is to say the largest dimension of the cross-section of the stay 5.

[0044] The stay 5 has at least one section which is embedded in the first portion of 3_1 of the wall 3, so as to be integrated and fixed to said first portion 3_1 of the wall, and at least one other section which is embedded in the second portion of 3_2 of the wall 3, so as to be integrated and fixed to said second portion 3_2 of the wall. It is then considered, by convention, that the first anchor point M1 corresponds to the point on the internal surface 3_in of the wall 3 of the object at the level at which the stay 5 emerges from the first portion 3_1 of the wall 3 to extend into the cavity 4 of the object, while the second anchor point M2 corresponds to the point on the internal surface 3_in of the wall 3 of the object at the level at which the stay 5 emerges from the second portion 3_2 of the wall 3 to extend into the cavity 4.

[0045] The invention is of course applicable to the manufacture of objects 2 which can be of various natures, shapes and dimensions.

[0046] In particular, although the invention is particularly intended for the manufacture of pneumatic tires 40 for equipping vehicle wheels, it could be envisaged to produce, by means of the tooling 1 and the process according to the invention, other types of inflatable pneumatic structures, bands reinforced by stays 5, etc.

[0047] Whatever the form or purpose of the object 2, the invention is more particularly applicable to the manufacture of objects 2 whose wall 3 is formed from rubber, and in particular applicable to a manufacturing process of object 2 which includes first of all a manufacturing step during which the wall 3 of the object 2 is shaped on the tooling 1 from one or more components based on raw rubber, i.e. unvulcanized, then a baking step during which the object 2 is baked in order to vulcanize said wall 3, then finally a demolding step during which the object 2 is separated from the tooling 1, after the baking operation.

[0048] As can be clearly seen in Figures 2, 5, 6 and 7, the tooling 1 includes a core 10 which materializes a volume 11, called the "reserved volume" 11, which corresponds to the cavity 4 of the object 2 and which is delimited by a convex external surface 10_out, called the "receiving surface" 10_out, which receiving surface 10_out has a form conjugate to the internal surface 3_in of the wall 3 of the object 2, is intended to receive one or more constituent components of said wall 3 of the object, and thus determines a distance called the "base distance" L0 between the first anchoring point M1 and the second anchoring point M2.

[0049] Typically, the receiving surface 10_out will be intended to be covered by one or more rubber-based components, more particularly one or more raw rubber-based components, such as rubber strips or rubber sheets, which sheets and / or strips may optionally be provided with reinforcing threads embedded in a layer of rubber. These components will be positioned so as to conform to the shape of the receiving surface 10_out to form the internal surface 3_in of the wall 3 of the object 2.

[0050] The core 10 is preferably metallic, for example steel. Said core 10 thus offers a rigid and robust receiving surface 10_out, and can be reused durably, for the successive manufacture of a large number of objects 2.

[0051] As can be seen in particular in figures 2, 5, 7 and 8, the core 10 includes at least one groove 12 which is cut inside the reserved volume 11, from the receiving surface 10_out, so as to accommodate the stay 5.

[0052] The groove 12 thus forms a slot which penetrates the volume of the core 10 and which opens onto the receiving surface 10_out by means of an opening 14 so that it is possible, before said groove 12 is covered and masked by constituent components of the wall 3, to engage the stay 5 in said groove 12 simply by sliding said stay 5 into said groove 12, from outside the core 10, so that said stay 5 passes through the receiving surface 10_out through the opening 14 to sink and lodge in the reserved volume 11, inside the core 10, and then remains inside the core 10 while the components of the wall 3 are placed on said core 10.

[0053] Preferably, the receiving surface 10_out is solid, apart from the opening formed by the mouth 14 of the groove 12, respectively, if there are several grooves, apart from the openings formed by said grooves.

[0054] Preferably, the groove or 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.

[0055] Said solid bottom 13 extends from a first portion of the mouth 14A of the groove 12, which opens onto a first zone of said receiving surface 10_out intended to receive the first portion 3_1 of the wall 3, to a second portion of the mouth 14B of the groove 12, which opens onto a second zone of said receiving surface 10_out intended to receive the second portion 3_2 of the wall 3.

[0056] The groove 12, and more particularly the opening 14 of said groove 12 through which said groove 12 opens onto the receiving surface 10_out, extends, on the receiving surface 10_out, continuously at least over the entire length of the receiving surface 10_out which goes from the first portion of the opening 14A to the second portion of the opening 14B. More particularly, the opening 14 of the groove 12 extends, on the receiving surface 10_out, continuously from the position of the first anchor point M1 to the position of the second anchor point M2, considered when the first portion 3_1 of the wall and the second portion 3_2 of the wall of the object are in contact with the receiving surface 10_out, as is the case on [Fig.5]. The first anchor point M1 and the second anchor point M2 are thus positioned during the manufacturing step of object 2, and more specifically of wall 3 of object 2, each opposite a portion of the mouth 14A, 14B of the groove 12.

[0057] According to the invention, the tooling 1 comprises a compensator 20 which has a stop 21 which is intended to cooperate with the stay 5 and which creates, inside the groove 12, a point M3 called the "intermediate passage point" M3 which is located in the groove 12 and outside the fictitious line DO, called the "base line" DO, which passes through the first anchor point M1 and the second anchor point M2, so that the total length L5 of the path 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, is strictly greater than the base distance LO, which allows the compensator 20 to have a reserve of stay length, denoted "Delta_L",which can be mobilized to allow the second portion 3_2 of the wall containing the second anchor point M2 to move away from the first portion 3_1 of the wall containing the first anchor point M1 when the core 10 is extracted from the cavity 4. ,

[0058] Thus, when the stay 5 is inserted into the groove 12, and then when the object 2 is made on the core 10, the stay 5 comes to rest against the stop 21, and therefore adopts a trajectory which is deviated from the shortest trajectory represented by the base line D0.

[0059] In practice, the basic line D0 is defined by the nominal positions of the first and second anchor points M1, M2, that is to say by the positions occupied by the first and second anchor points M1, M2 when the object 2 is made, when the first portion of wall 3_1 and the second portion of wall 3_2 are in contact with the receiving surface 10_out of the core 10 so that the internal wall 3_in fits said receiving surface 10_out.

[0060] Geometrically, the compensator 20 allows the 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 21 forms the third vertex.

[0061] In a particularly preferential way, the stop 21 is adaptive, in that said stop 21 allows a variation of the position of the intermediate passage point M3 within the groove 12 in reaction to a variation of the intensity of the longitudinal tension which reigns in the stay 5, between the first anchor point M1 and the second anchor point M2.

[0062] This adaptive character can in particular be obtained by giving the stop 21 an elastic behavior.

[0063] According to one possible implementation, this elastic behavior will allow the stop 21 to function 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, resisting the movement of the stay 5, or on the contrary, by elastically giving way under the effect of a stress greater than a predetermined threshold, release and / or let the stay 5 pass to allow the latter to change its position in response to the stress.

[0064] One could thus, for example, provide a stop 21 in the form of a curved spring-blade, which would have a base, fixed to a first lateral wall 15 delimiting the groove 12, and an arch supported by the base and forming a bulge towards a second lateral wall 10 delimiting the groove 12, opposite the first lateral wall 15, so that said arch, elastically deformable and forming at rest with the second lateral 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 hold the stay 5 at the intermediate passage point M3 by elastic pinching between the arch and the second lateral wall 16, and, when a sufficiently intense tension is exerted on the stay 5, release said stay 5 and / or allow said stay 5 to pass the constriction, either to sink deeper into groove 12,either to extract oneself from said groove 12. ,

[0065] According to another possible embodiment, to which reference will preferably be made in what follows, the stop 21 is mounted movably in the groove 12 and is supported by an elastic member 22 so that said stop 21 is capable of ensuring elastic suspension of the stay 5 housed in the groove 12.

[0066] According to such an arrangement, during the making of the object 2 on the core 10, the stay 5 comes to rest against the stop 21 and can push said stop 21 against the restoring force generated by the elastic member 22, over a distance of penetration which depends among other things on the stiffness of said elastic member 22 and on the longitudinal tension which is exerted in the stay 5 during the installation of the stay 5.

[0067] When, after the formation of the wall 3 of the object on the core 10, the separation of the second portion 3_2 of the wall is forced relative to the first portion 3_1 of the wall, so as to straighten the wall 3 to further open the cavity 4 in order to give passage to the core 10 for demolding, as illustrated in [Fig.6], an additional tension is generated on the ends of the stay 5 which are located respectively at the first anchor point M1 and the second anchor point M2, and thus the longitudinal tension in the stay 5 is increased.

[0068] In response, the compensator 20 releases all or part of the initially constituted reserve of shroud length, allowing the shroud 5 to unfold and to straighten to the extent necessary to relieve this increase in longitudinal tension.

[0069] To do this, it is notably possible for the adaptive stop 21 to move, or even completely release, the intermediate passage point M3, to allow the corresponding portion of the stay 5 to approach the fictitious line which connects the first anchor point M1 to the second anchor point M2 at the moment considered.

[0070] If the stop 21 is suspended elastically, the elastic member 22 deforms elastically, and thus allows the stop 21, and therefore the intermediate passage point M3, to move within the groove 12, which allows the stay 5 to unfold to the extent necessary to adapt at all times to the spacing distance which separates the first anchor point M1 from the second anchor point M2.

[0071] Thanks to this flexibility of the intermediate passing point M3, the compensator 20 is indeed geometrically capable of bringing the third vertex M3 closer to the base [M1M2] of the triangle M1M2M3, thus reducing the height of the triangle which is emanating from said third vertex M3 and perpendicular to the base [M1M2], and increasing the value of the angle at the vertex of said third vertex M3. This deformation of the triangle M1M2M3 makes it possible to increase the length of the base [M1M2] of the triangle to the necessary and sufficient extent to accommodate the spreading movement which moves the first anchor point M1 and the second anchor point M2 further apart.

[0072] It should also be noted that the compensator 20 advantageously forms a tensioning device which, thanks to the restoring force exerted by the elastic element 22, makes it possible to maintain the stay 5 under tension between the first anchor point M1 and the intermediate passage point M3 on the one hand, and between the intermediate passage point M3 and the second anchor point M2 on the other hand, that is to say, to maintain a stay 5 that is straight in sections, on each of the two sides [M1M3], [M3M2] of the triangle which are formed by the stay 5 opposite the base [M1M2]. It should be noted that, here, the sides of the triangle which are occupied by the stay 5 preferably form the two shorter sides of said triangle, each being of a length less than the length of the base [M1M2] which then forms the longer side of the triangle.

[0073] Maintaining tension in the two sections of the stay 5 forming sides [M1M3] and [M3M2] allows, in particular, for the stay 5 to be positioned within the groove 12, both during the manufacturing stage, including the placement of the stay 5 and then the placement of the constituent components of the wall 3 of the object 2, and during at least part of the demolding operation. This avoids, in particular, any risk of the stay 5 becoming jammed or entangled, especially during the demolding stage.

[0074] According to the invention, the reserve of shroud length, denoted "Delta_L", is advantageously constituted by means of the compensator 20 during insertion initial of the stay 5 in the groove 12, and is then available and usable by the compensator 20 to allow a variation, and more precisely an increase, of the distance which separates the second anchor point M2 from the first anchor point M1, compared to what this distance is initially, namely compared to the basic distance LO which is initially defined by the core 10 during the wall making step 3.

[0075] It will be noted that, advantageously, the compensator 20 not only makes it possible to compensate for a forced increase in the distance separating the second anchor point M2 from the first anchor point M1, when such an increase is caused by the demolding operation, but also for a possible intrinsic shortening of the stay 5 which results from a thermal shrinkage of the stay 5, linked to the nature of the material or materials constituting the stay 5, and which is caused by a baking step which is carried out after the wall making step 3 and before the demolding step.

[0076] The reserve length of the stay 5, Delta_L, is equal to the difference between, on the one hand, the length L5_tot of the path 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 base distance L0: Delta_L = L5_tot - L0

[0077] In the aforementioned triangular configuration, in which the stay 5 is tensioned so as to form straight segments from the first anchor point M1 to the intermediate passage point M3 first, and then from the intermediate passage point M3 to the second anchor point M2, the maximum available stay length reserve Delta_L is, in absolute terms, the difference between, on the one hand, the cumulative length of the two pieces of the stay forming the shorter 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 L0 as defined by the shape and dimensions of the core 10 and which separates the first anchor point M1 located in the first portion of wall 3_1 from the second anchor point M2 located in the second portion of wall 3_2 when said first and second portions of wall 3_1,3_2 conform to the receiving surface 10_out of said core 10. ,

[0078] Preferably, said reserve of stay length Delta_L is between 3% and 30%, preferably between 8% and 20%, more preferably between 10% and 15%, of the basic distance L0.

[0079] Preferably, alternatively or cumulatively with the relative proportions indicated above, the reserve of stay length Delta_L can be, 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.

[0080] This dimensioning of the length reserve Delta_L, and more particularly the low values ​​(minimum values) chosen for said length reserve Delta_L, advantageously allows for sufficient excess length of stay 5 in stock in the groove 12, at the end of the manufacturing stage and before the possible curing and demolding stages, i.e., sufficient initial excess length of stay, so that the stay 5 can then undergo without damage: - any possible intrinsic shortening of said stay 5 caused by thermal shrinkage, during the curing stage, while the first and second anchor points M1, M2 are maintained by the core 10 at a fixed distance from each other, in this case at the basic distance L0 from each other, and, above all, - an increase in the effective distance separating the first and second anchor points M1, M2,caused by the forced separation of the first and second wall portions 3_1, 3_2, when at least one of said first and second wall portions 3_1, 3_2 is detached and separated from the receiving surface 10_out of the core 10 during the demolding step.

[0081] This same dimensioning of the length reserve Delta_L, and more particularly the upper values ​​(maximum values) chosen for said length reserve Delta_L, advantageously allows the initial excess length of the stay 5 to be limited in such a way that, after the demolding operation, and once the object 2 is placed in the functional configuration for which said object 2 is intended, for example once the object 2 is mounted on a mounting support, such as a rim, and / or once the object 2 is inflated by introducing a pressurized fluid into the cavity 4, then the wall 3, and more particularly the first portion of the wall 3_1 and the second portion of the wall 3_2, are in a configuration such that the initial excess length of the stay is absorbed, that is to say, the stay 5 extends in a straight line, and therefore in a substantially taut manner, in the cavity 4, from the first anchor point M1 to the second anchor point M2,and can thus perform its bracing function, by counteracting the relative separation of the first and second anchor points M1, M2, and therefore by holding the second section of wall 3_2 in relation to the first section of wall 3_1 and vice versa.

[0082] Preferably, the core 10 comprises a plurality of grooves 12 spaced apart from each other and intended to accommodate each one a separate stay 5.

[0083] This allows the object 2 to be equipped with a plurality of stays 5, each extending from a first anchor point M1, distinct from the first anchor points M1 of the other stays 5, to a second anchor point M2, distinct from the second anchor points M2 of the other stays 5. The object 2 thus presents, as shown, in particular the case on the [Fig.1], a series of first anchor points M1 and a series of second anchor points M2, connected to each other by a series of guy wires 5, which ensures multi-point guying of the wall 3.

[0084] As indicated above, each of the grooves 12 of the plurality of grooves 12 advantageously has an opening 14 which forms a continuous opening along the profile of the receiving surface 10_out, from the first portion of the wall 3_1 to the second portion of the wall 3_2, and more particularly from the first anchor point M1 of the stay 5 associated with the groove 12 considered to the second anchor point M2 of said stay 5.

[0085] When the core 10 comprises a plurality of grooves 12, the compensator 20 then preferably comprises, as can be seen in particular in [Fig.2], a plurality of stops 21, each of said stops 21 being intended for one of said grooves 12. Each stop 21 can of course preferably be supported by an elastic member 22.

[0086] Thus, each stay 5 will be offered a passage point M3 giving said stay 5 a reserve of length, which will be available in particular during the demolding operation.

[0087] Even more preferably, each stop 21 is supported by its own elastic element 22, distinct from the elastic elements 22 associated with the other stops 21, to ensure an individual elastic suspension of each stay 5, independent of the suspension of the other stays 5.

[0088] That being said, it is not excluded to consider a collective elastic organ 22, shared by several movable stops 21.

[0089] It will be noted that, in the present application, preferential reference is made, for convenience of description, to a particular groove 12 and to the corresponding stay 5, it being understood that the considerations and characteristics applicable to a groove 12 may preferably apply, in a similar manner, to several grooves 12, preferably to all the grooves 12 of the core 10, and to the corresponding stays 5.

[0090] Preferably, the groove 12 is delimited by two solid lateral walls 15, 16 facing each other, which are secant to the receiving surface 10_out and which define between them a groove width W12 which is sufficient to allow the free passage of the transverse section of the stay 5.

[0091] Each of said side walls 15, 16 extends preferably continuously from the mouth 14 of the groove 12 to the bottom 13 of said groove 12.

[0092] Said lateral walls 15, 16, which may preferably be parallel to each other, advantageously allow the stay 5 to be guided inside the groove 12, and to limit the transverse movement of said stay 5, in particular when said stay 5 is in contact with the movable stop 21.

[0093] By way of example, 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 between 0.3 mm and 3 mm, preferably between 0.5 mm and 2 mm, for example between 0.8 mm and 1.2 mm

[0094] In practice, the width W12 of the groove 12 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.

[0095] More particularly, knowing the diameter of the stay 5, we can apply a dimensioning rule which will consist of choosing a groove width W12 equal to the diameter of the stay 5 plus 10% to 30%, for example plus 20%.

[0096] As an indication, alternatively or cumulatively with the ranges of relative values ​​mentioned above, the width W12 of the groove 12 can be, in absolute value, 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.

[0097] Preferably, the stop 21 is formed by a ball 23 whose diameter is strictly greater than the width W12 of the groove 12 and which is guided in sliding in a chamber 24 which communicates with said groove 12 by a slot 25 which allows the stay 5 to engage the stop 21, as can be seen in particular in figures 2, 3, 4, 5 and 6.

[0098] The stop 21 thus forms a slider which is mounted movable and guided in the chamber 24, here in rectilinear translation.

[0099] The slot 25 preferably has a width equal to the width W12 of the groove, or possibly slightly greater than the width W12 of the groove, but in all cases strictly less than the diameter of the ball 23, and more preferably strictly less than the radius of the ball 23, so that the ball 23 remains captive in the chamber 24 without being able to pass through the slot 25, and that the slot 25 overlaps the groove 12 to allow the stay 5 to slide into the chamber 24 in order to bear against the stop 21 while being guided by the slot 25. The stay 5 can thus slide in the slot 25, and more generally in the groove 12, along the lateral walls 15, 16, without risk of jamming, when the stop 21 moves under the combined action of a longitudinal tension exerted on the stay 5 and the restoring force exerted by the elastic organ 22.

[0100] Of course, a slider of a shape other than a ball 23 could be used as a stop 21, provided that this shape is suitable for sliding, here rectilinear, and that the the slider has a width greater than the width of the slot 25, to remain captive in the chamber 24. For example, a rectangular parallelepiped with rounded corners and edges, mounted to slide in the chamber 24, could be used as a stop 21.

[0101] However, the use of a ball 23 has several advantages, including simplicity of implementation, a rounded contact surface which does not risk injuring the stay 5 by abrasion or cutting the stay 5, and a spherical shape which ensures a sliding of the stop 21 inside the chamber 24 without jolts or seizing.

[0102] The direction D21 of displacement of the stop 21, and more particularly the direction of translation of the cursor formed here by the ball 23, as this direction of translation is defined by the chamber 24, is preferably parallel to the lateral walls 15, 16 of the groove 12, and perpendicular or substantially perpendicular (at + / - 5 degrees, for example) to the basic line DO.

[0103] Such an arrangement is both simple, robust, and well suited to optimize the sensitivity of the compensator 20 to variations in longitudinal tension that affect the stay 5.

[0104] It is of course possible to consider different types of elastic members 22. According to one possibility illustrated in [Fig.4], the elastic member 22 can be formed by a torsion spring 26, one arm of which supports the stop 21, here the ball 23, against the stay 5.

[0105] However, according to a preferred arrangement, the elastic element 22 is formed by a helical spring 27, as illustrated in Figures 2, 3, 5, 6 and 7.

[0106] Such an arrangement is indeed particularly simple, compact and inexpensive.

[0107] In addition, it allows easy selection of a stiffness of the elastic element 22 which is adapted to the stay 5 and the core 10 used.

[0108] Preferably, the preload of the elastic element 22, which is here a compression preload against the stop 21 and therefore against the sinking of the stay 5, can be adapted by means of a setting screw which axially compresses the helical spring 27 within the chamber 24, against the ball 23.

[0109] In this respect, it will be noted that it will be possible to close the chamber 24 by means of a threaded breech which will ensure a dual function by forming, opposite the slot 25, on the one hand a sealing member whose function is to prevent the elastic member 22, here the helical spring 27, as well as the stop 21, here the ball 23, from escaping from the chamber 24, and on the other hand a calibration screw whose function is to adjust the preload in compression of the elastic member 22, here the helical spring 27.

[0110] The preload of the elastic element 22 may preferably be chosen to be equal to or greater than the foreseeable intensity of the force that the stay 5 exerts on the stop 21, against said elastic element 22, during the installation of the stay 5 in the groove 12, due to the longitudinal tension that the installation device exerts on the stay 5. Thus, the stop 21 will be able to resist indentation during the installation operation of the stay 5, and will only give way and indent against the elastic element 22 during the demolding operation, when the longitudinal tension in the stay 5 is increased by pulling on the second portion of the wall 3_2. Thus, it will be advantageously possible to define precisely, and reproducibly, the position of the intermediate passage point M3 during the installation of the stay 5.

[0111] Here, said intermediate passage point M3 will indeed initially correspond to the rest position of the ball 23 when said ball 23 is pressed against the bottom of the chamber 24, opposite the opening of the slot 25, by the helical spring 27.

[0112] In practice, the prestress of the elastic member 22, and therefore here more particularly the prestress which presses the ball 23 into the bottom of the chamber 24, awaiting the stay 5, may be between 2 Newtons and 50 Newtons, for example between 8 Newtons and 15 Newtons, or more particularly between 10 Newtons and 12 Newtons.

[0113] Preferably, the intermediate passage point M3 defined by the stop 21 is, as can be clearly seen in [Fig.5], located in an area which is strictly contained between the base line D0 on the one hand and the outline of the receiving surface 10_out on which the groove 12 opens on the other hand.

[0114] Thus, when the stay 5 is inserted into the groove 12, by exerting a slight longitudinal tension in said stay 5 and by forcing said stay 5 to pass through the first anchor point M1 and the second anchor point M2, then the interception of the stay 5 by the stop 21 occurs automatically, slightly below the receiving surface 10_out, thus imposing on the stay 5 a bend, at the level of the intermediate passage point M3, so that the stay 5 cannot reach a direct straight configuration between the first anchor point M1 and the second anchor point M2, that is to say so that the stay 5, although passing through the first and second anchor points M1, M2, cannot come to be fully taut and coincide with the basic line D0.

[0115] If the stop 21 is suspended, the elastic element 22 is then preferably arranged so as to be able to push the stop 21 against the stay 5, in the direction of the receiving surface 10_out.

[0116] Advantageously, this configuration allows the elastic element 22, here the helical spring 27, to work in compression, in a stable and robust manner, against the stay 5, and to use the stop 21, here the ball 23, as a pusher which tends to elastically recall the stay 5 towards the mouth 14 of the groove 12, and therefore towards the receiving surface 10_out, opposite the bottom 13 of the groove 12.

[0117] The sinking of the stop 21, here along the direction of displacement D21 imposed by the configuration of the chamber 24 which guides the stop 21, automatically adapts to the intensity of the longitudinal tension exerted in the stay 5, thus allowing the compensator 20 to dynamically accommodate the length variations imposed on the stay 5.

[0118] More particularly, during the initial placement of the stay, the stop 21 sinks to a first degree of indentation, which may be substantially zero, and which it maintains while the components of the wall 3 are placed on the core, as can be seen in [Fig.5], then, when the second portion of the wall 3_2 is separated from the first portion of the wall 3_1 in order to proceed with demolding, the stop 21 sinks further by compressing the elastic element 22, to reach a second degree of indentation, greater than the first degree of indentation, which allows, as illustrated in [Fig.6], the intermediate passage point M3 to be repositioned so as to unfold the stay 5 to accompany the increase in the distance which separates the first anchor point M1 from the second anchor point M2.

[0119] Preferably, as illustrated in [Fig.2], the compensator 20 comprises a cartridge 30 which is inserted removably into the core 10 in a direction D30 called the "insertion direction" D30 which is transverse to the lateral walls 15,16 delimiting the groove 12, and more preferably, when the core 10 comprises a series of several grooves 12, which is transverse to the lateral walls 15, 16 delimiting the different grooves 12.

[0120] The cartridge 30 includes a chamber 24 which contains a stop 21, preferably a ball 23, moved by an elastic element 22, preferably a helical spring 27, said chamber 24 being provided with a slot 25 which is arranged, here transversely to the insertion direction D30, to align with the groove 12 of the core 10 in order to allow the stay 5 to reach the stop 21 located in said chamber 24.

[0121] More preferably, in the case of a plurality of grooves 12, the cartridge 30 comprises a plurality of chambers 24 each containing a stop 21, preferably a ball 23, moved by an elastic element 22, preferably a helical spring 27, each chamber 24 being provided with a slot 25 which is arranged to align with the corresponding groove 12 of the core 10 in order to allow the relevant stay 5 to reach the stop 21 located in said chamber 24.

[0122] The cartridge 30 is thus in the form of a slotted cage 25, which is inserted through the core 10 to position the stops 21, here the balls 23, opposite each groove 12.

[0123] Preferably, each chamber 24 contains the elastic element 22 specific to the stop 21 concerned. Thus, the cartridge 30 will ensure individual elastic suspension of each stop 21, and therefore of each corresponding stay 5.

[0124] Preferably, the chamber 24 will form a bore arranged to receive on the one hand the ball 23 and on the other hand the helical spring 27 which pushes said ball 23 in the direction of the slot 25, and therefore against the stay 5.

[0125] According to one possible arrangement, the stops 21 and the elastic elements 22 can be held in place inside the cartridge 30 by the solid portion of the core 10 itself. To this end, the cartridge 30 will be inserted iteratively, each iteration comprising: a first step in which an assembly consisting of a stop 21, here a ball 23, and an elastic element 22, here a helical spring 27, is introduced into the chamber 24 closest to the core 10; then a step in which the cartridge 30 is pushed into the core 10, along the insertion direction D30, to a distance corresponding to the spacing between two successive chambers 24. The operation will be repeated as many times as there are chambers 24 to be filled.

[0126] According to another possible arrangement, each of the chambers 24 can be closed by means of a threaded breechblock, which will be screwed into the cartridge 30, at a threaded end of the chamber 24, after the stop 21, here the ball 23, and the elastic element 22, here the helical spring 27, have been inserted into said chamber 24. The threaded breechblock will thus provide support for the elastic element 22, here the helical spring 27, at an end of said elastic element 22 located opposite the end supporting the stop 21. Once the cartridge 30 is fitted with its stops 21 and elastic elements 22, held by the threaded breechblocks, the cartridge 30 as a whole can be inserted into the core 10.

[0127] Such an arrangement allows, on the one hand, easy handling of the cartridge 30 without risk of losing balls 23 or springs 27, since the threaded breeches which close the chambers 24 retain these elements inside said chambers 24, and on the other hand, individual calibration of each elastic element 22, since the pushing of each threaded breech into the corresponding chamber 24, by screwing, makes it possible to increase the preload in compression of the elastic element 22, here of the helical spring 27.

[0128] In a particularly preferential manner, the tooling 1 shall be intended for the manufacture of a toroidal tire 40, such as that illustrated in [Fig. 1], said toroidal tire 40 comprising a crest 41 intended to form a tread, a first annular bead 42 and a second annular bead 43 designed to allow the tire 40 to be attached to a mounting support such as a rim, as well as a first flank 44 and a second flank 45 which connect the crest 41 respectively to the first bead 42 and the second bead 43; the crest 41, the first and second flanks 44, 45 and the first and second bead 42, 43 together form the wall 3 having the concave internal surface 3_in which delimits the cavity 4 of the tire 40.

[0129] The receiving surface 10_out of the core 10 then has, as can be seen in figures 5, 6 and 7, a toroidal shape which is centered on a central axis Z10 and which includes a radially external summit zone 51, intended to receive constituent components of the summit 41 of the band 40, and, on either side axially of said summit zone 51, a first lateral zone 52 folded towards the central axis Z10 and intended to receive constituent components of the first flank 44 and the first heel 42 as well as a second lateral zone 53 folded towards the central axis Z10 and intended to receive constituent components of the second flank 45 and the second heel 43.

[0130] It will be noted that, in a manner known per se, the first and second heels 42, 43 will preferably each contain at least one rod, for example formed by a braid of one or more metal wires or by turns of continuous wire wound around the central axis Z10, so that each rod will form, around the central axis Z10, an annular reinforcement whose circumference is almost inextensible.

[0131] The toroidal core 10 will advantageously be divided into juxtaposed sectors 54, 55, each occupying a predetermined angular sector in azimuth around the central axis Z10, as can be seen in [Fig.8].

[0132] This succession of sectors 54, 55 comprises, alternately, sectors 54 called "keys" 54, designed to be accessible by radially internal approach and to be removed first during the disassembly of the core 10 carried out during the demolding operation, and sectors 55 called "vaults" 55 which are supported and locked in position by the keys 54 and designed to become maneuverable after they have been released by the removal of the keys 54.

[0133] According to one possible arrangement, sectors 54, 55 may themselves be axially divided into three blocks, as described in application WO-2022 / 200718 mentioned in the preamble, namely: - a first block called the "central block" which forms a central portion of the summit zone 51 of the reception surface 10_out, the set of central blocks forming a ring called the "central ring", - a second block called the "left ear" which is axially attached to the first block, said left ear 22 comprising the first lateral zone 52 of the reception surface 10_out as well as a portion of the summit zone 51 which axially extends the central portion of the summit zone carried by the central block, on the corresponding side of said central block, - a third block called the "right ear" which is axially attached to the central block, on the side of the central block which is axially opposite to the side receiving the left ear, said right ear comprising the second lateral zone 53 of the receiving surface 10_out as well as a portion of the summit zone 51 which axially extends the central portion of the summit zone 11 on the corresponding side of the central block.

[0134] However, according to a preferred embodiment, each sector 54, 55 may be monolithic, in that it extends in a single piece over the entire axial width of the core 10, from the first lateral zone 52 inclusive to the second lateral zone 53 inclusive, including the apex zone 51, thus offering a sector 54, 55 which, in cross-section in a radial plane containing the central axis Z10, has a Q-shaped (capital Omega) cross-section, as can be seen in Figures 5, 6 and 7. In practice, the implementation of a monolithic sector 54, 55 amounts to fusing into a single piece the different constituent blocks of a sector 54, 55 as described in application WO-2022 / 200718, namely the left ear, which here will form a first lobe 17, the central block, and the right ear, which will form here a second lobe 18.

[0135] It should be noted that, for simplicity of representation, [Fig.2] represents a portion of a sector 54, 55, which can in practice correspond to an ear within the meaning of application WO-2022 / 200718. Of course, the arrangement illustrated in [Fig.2], namely the implementation of a cartridge 30 as described above, can nevertheless be found in a similar way within a monolithic sector 54, 55, by providing a cartridge 30 for each portion of the monolithic sector 44, 45 fulfilling the function of an ear, and therefore ultimately by providing two cartridges 30 for each monolithic sector 54, 55, as shown in Figures 5, 6 and 7.

[0136] Preferably, the toroidal core 10 will be divided into twenty sectors 54, 55 around the central axis Z10, even more preferably into ten sectors 54, 55 with five keys 54 and five vaults 55, as illustrated in [Fig.8].

[0137] The core 10 intended to manufacture a toroidal bandage 40 comprises a plurality of grooves 12 which are distributed in azimuth around the central axis Z10, as can be clearly seen in [Fig.8], and which are arranged to allow the passage, through the cavity 4, of stays 5 which each connect, as can be clearly seen in particular in [Fig.1], a first anchor point M1 called the "summit anchor point" which is located in the apex 41 of the bandage 40 to a second anchor point M2 called the "lateral anchor point" which is located in one of the flanks 44, 45 or the heels 42, 43 of the bandage 40.

[0138] Thus, in this particular case, the first portion 3_1 of the wall 3 mentioned above will correspond to the top 41 of the bandage 40, while the second portion 3_2 of the wall 3 will correspond to one of the flanks 44, 45 or to one of the heels 42, 43 of the bandage 40.

[0139] Preferably, the first anchor point M1 and the second anchor point M2 associated with the same stay 5, and therefore with the same groove 12, are located at the same azimuthal position around the central axis Z10. The baseline D0 associated with said groove 12 is then, in this case, contained in a radial plane containing the central axis Z10 of the core 10.

[0140] The compensator 20 advantageously associates with each groove 12 of the plurality of grooves 12 of the core 10 intended to manufacture a toroidal tire 40 a stop 21, preferably suspended by an elastic element 22, in order to create a reserve of stay length Delta_L in said groove 12.

[0141] Thus, in each groove 12, there is a stop 21 capable of positioning the stay 5 housed in the groove 12, at a point called the "intermediate passage point" M3 which is located in the groove 12 and outside the fictitious line, called the "baseline" D0, which passes through the first anchor point M1 and the second anchor point M2, so that the total length L5 of the path 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, is strictly greater than the baseline distance L0 which is defined between the first and second anchor points M1, M2 by the core 10, for the stay 5 considered, which allows the compensator 20 to have, for each stay 5, a reserve of stay length which is deployable to allow for flank 44, 45 or heel 42,43 containing the second anchor point M2 to move away from the apex 41 containing the first anchor point M1 when the core 10 is extracted from the cavity 4. ,

[0142] Preferably, in each groove 12 there is a stop 21 formed by a ball 23, which is mounted movably in said groove 12 and which is here supported by an elastic element 22, preferably a helical spring 27, so that said stop 21 is capable of ensuring elastic suspension of the stay 5 at the intermediate passing point M3.

[0143] It will be noted that, preferably, the first heel 42 and the second heel 43 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 extraction direction D_extract of the sector 54, 55 considered, extraction direction D_extract which, as can be seen in figures 6 and 8, is here perpendicular to the central axis Z10, and contained in the bisector plane of the sector 54, 55 considered, that is to say the radial plane called "median radial plane" which contains the central axis Z10 as well as the bisector of the angle covered, around the central axis Z10, by the sector 54, 55 considered.

[0144] In this case, the demolding operation requires axially separating the first heel 42 and the second heel 43 from each other, to allow passage of the sector 54, 55 which we wish to extract.

[0145] In this respect, the separation of the heels 42, 43 can be caused simply by forcing the elastic deformation of the first and second flanks 44, 45 of the bandage under the effect of the thrust of the first and second lobes 17, 18 of the sector 54, 55 which performs the centripetal radial extraction movement, relative to the bandage 40, along the extraction direction D_extract. In this case, the first and second flanks 44, 45 and / or the first and second heels 42, 43 can slide on the lobes 17, 18, remaining in contact with the receiving surface 10_out, at least at the beginning of the extraction movement, as illustrated in [Fig. 6].

[0146] Alternatively, one could consider actively detaching 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 opposing tensile forces on said first and second heels 42, 43, in order to open a passage of suitable width in front of the sector 54, 55 concerned. For this purpose, the heels could, for example, be forced apart using a suitable tensile tool, separate from the sector 54, 55 considered and engaging with said heels 42, 43.

[0147] 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 Z10, 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 occupied by the sector 54, 55 which we wish to extract out of 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.9].

[0148] Of course, the separation of the heels 42, 43, regardless of how the separation is caused or the sector 54, 55 concerned by said separation, must not cause any damage to the bandage 40 or to the stays 5. In particular, the separation of the heels 42, 43 must not cause any weakening or tensile failure of the stays 5, nor tearing of their anchor points M1, M2.

[0149] 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 anchor points M1, M2, variations which are induced by the displacement of the heel 42, 43 concerned.

[0150] This compensation, and more particularly the unfolding of the stay 5, can advantageously occur in the sector 54, 55 which performs the demolding movement along the extraction direction D_extract, while the summit zone 51 of said sector 54, 55 detaches and moves away from the internal wall 3_in of the summit 41 of the bandage, as illustrated in [Fig.6], but also in the sectors 55, 54 which are immediately adjacent to said sector performing the demolding movement, while said adjacent sectors 55, 54 are still in place in the cavity 4 of the bandage, the summit area 51 of each of said adjacent sectors 54, 55 being still in contact with the inner wall 3_in at the level of the summit 41 of the bandage, but that the heels 42, 43 of said adjacent sectors 55, 54 are spread apart and thus detached from the lateral areas 52, 53 of the receiving surface 10_out, as illustrated in [Fig.9].

[0151] Advantageously, the compensator 20 therefore allows all the relevant stays 5 to adapt flexibly to the tension induced by the displacement of the heel 42, 43, which is specific to them, both in the sector 54, 55 which executes the demolding movement according to the extraction direction D_extract and in the sectors 54, 55 which are immediately adjacent to said sector executing the demolding movement.

[0152] It will also be noted that the differential movement of the stop 21 with respect to the core 10, permitted by the deformation of the elastic member 22, can advantageously be carried by a direction of displacement D21 which is not parallel to the direction of extraction D_extract followed by the core 10.

[0153] Of course, the invention also relates to a method of manufacturing an object in which a tool 1 according to the invention is used.

[0154] According to this manufacturing process, a stay 5 is placed in each groove 12 of the core 10, against the stop 21, here preferably against the stop 21 which is supported by the elastic element 22, then at least one component is placed on the receiving surface 10_out to form the wall 3, then the object 2 is demolded by separating a first portion of the wall 3_1 containing a first anchor point M1 of the stay 5 and a second portion of the wall 3_2 containing a second anchor point M2 of the stay 5, to allow the extraction of the core 10 out of the cavity 4 delimited by the wall 3.

[0155] Preferably, when installing the stay 5, a longitudinal tension is exerted on the stay 5, between the first anchor point M1 and the second anchor point M2, so that the path followed by the stay 5 within the groove 12 forms a broken line, straight in pieces, of which the intermediate point of passage M3 forms a vertex.

[0156] This placement of the stay 5 against the stop 21 can cause a certain recoil of said stop 21, in the direction D21 of displacement, to the extent necessary to allow the force exerted by the elastic member 22 on the stop 21 to balance the force exerted by the stay 5 on the stop 21.

[0157] The stay 5 is preferably fixed to the receiving surface 10_out of the core, by attaching the stay 5 to anchoring structures pre-arranged on the surface of reception 10_out and intended to permanently integrate the wall 3 of the object 2, so as to form the first and second anchor points M1, M2. This makes it possible to keep the stay 5 under tension while the core 10 is covered with constituent components of the wall 3. According to a preferred embodiment, the anchor structures will be formed by sticky strips, for example raw rubber strips, arranged on the core 10 respectively near the first portion of the mouth 14A through which the stay 5 enters the groove 12 and near the second portion of the mouth 14B through which the stay 5 exits the groove 12, sticky strips against which the stay 5 will be pressed, or even in which the stay 5 will be buried.

[0158] Of course, the wall 3 will be sufficiently flexible, and more preferably elastically flexible, to tolerate the gap necessary for the extraction of the core 10.

[0159] Preferably, the manufactured object 2 is a bandage 40, more preferably a toroidal bandage 40, the wall of which 3 is formed from one or more rubber-based components.

[0160] In this case, according to the manufacturing process, the stays 5 are placed on the core 10, in the grooves 12, the said rubber-based component(s), intended to form the wall, are placed in the raw state on the receiving surface 10_out of the core, then the core 10 fitted with the stays 5 and the wall 3 is subjected to a baking operation allowing the rubber-based wall component(s) to be vulcanized, then the bandage 40 is demolded by separating, by elastic deformation, the second portion of the wall 3_2 from the first portion of the wall 3_1 and by extracting the core 10 from the cavity 4 delimited by the said wall 3.

[0161] In the case of a toroidal bandage 40, this will allow in particular, by axially separating the sides 44, 45 and the heels 42, 43 of the bandage to enlarge the neck delimited by said heels 42, 43, to clear a passage sufficient to extract the core 10, here the sector 54, 55 concerned of said core 10, through said neck according to a centripetal radial demolding movement.

[0162] Of course, the invention is by no means limited to the examples of embodiment described above, the person skilled in the art being able in particular to isolate or freely combine one or the other of the aforementioned characteristics, or to substitute equivalents for them.

[0163] In particular, as an alternative to the placement of raw rubber-based components and the aforementioned baking step, consideration could be given to producing all or part of the object 2, and in particular all or part of the top 41, the sides 44, 45 and / or the heels 42, 43 of the band 40, by injecting a thermoplastic elastomer material, after covering the core 10, carrying the stays 5, by means of a suitable injection mold.

[0164] The cooking step will then be replaced by a cooling step allowing the thermoplastic elastomer material to be brought to a solid and elastic state.

[0165] A hybrid process could of course be considered, combining a filling phase in which solid rubber-based elements are placed on the core 10, and a thermoplastic elastomer injection phase. The curing step could then occur before, simultaneously with, or after the thermoplastic elastomer injection phase.

[0166] In all cases, the process then includes, once the object 2 has been made, here once the bandage 40 has been made, a demolding step during which the core 10 is released from the cavity 4 of the object 2 leaving the stays 5 in place in said cavity 4, as illustrated in particular in the sequence of figures 5, 6 and 7.

[0167] As mentioned above, other possibilities for the realization of the compensator 20, and more particularly of the stop 21, can be considered.

[0168] In particular, as indicated above, it may be envisaged that the stop 21 be arranged to operate by threshold effect, so as to, depending on the stresses exerted on the stay 5, and more particularly depending on the intensity of the longitudinal tension exerted in the stay 5, either retain the stay 5 at an intermediate passage point M3, resisting the movement of the stay 5, or, under the effect of a stress greater than a predetermined threshold, release and / or allow the stay 5 to pass to allow said stay 5 to change its position in response to the stress, and more particularly to allow said stay 5 to leave the intermediate passage point M3 at which said stay 5 was initially retained by said stop 21.

[0169] According to one embodiment which may constitute an invention in itself, the groove 12 being delimited, as already mentioned above, by a first solid lateral wall 15 and a second solid lateral wall 16 facing each other, which intersect the receiving surface 10_out and which define between them a groove width W12 sufficient to allow the free passage of the cross-section of the stay 5, the stop 21 may advantageously define, with the second lateral wall 16, a constriction 60 which is narrower than the cross-section of the stay 5, as can be seen in particular in Figures 13 and 16, so as to be able, on the one hand, to stop the insertion of the stay 5 into the groove 12 at the intermediate passage point M3 by blocking the stay 5 between the stop 21 and said second lateral wall 16, as can be seen in Figures 13, 16 and 17, and on the other part,when sufficiently intense tension is exerted on the stay 5, release said stay 5 to allow said stay 5 either to sink deeper into the groove 12, here more particularly towards the bottom 13, as illustrated in [Fig. 18], or to emerge from said groove 12, as illustrated in [Fig. 19], here in , crossing the mouth 14 to cross the reception surface 10_out and thus free itself from the core 10.

[0170] For this purpose, according to a first variant of arrangement, the stop 21 can include, as illustrated in figures 10, 11 and 13, a leaf spring 61 which is carried by a base 62 fixed to the first lateral wall 15.

[0171] Said sole 62 may be in the form of a barrel, preferably cylindrical, which may be screwed into the core 10.

[0172] Said shaft may have a flat 62A arranged to be substantially flush with the first lateral wall 15.

[0173] The spring-blade 61 has an arch 63 which forms a bulge in the direction of the second lateral wall 16, opposite the first lateral wall 15, so that said arch 63 forms, with the second lateral wall 16, the constriction 60.

[0174] Said leaf-spring 61 is advantageously elastically deformable so as to be able on the one hand to retain the stay 5 at the intermediate passage point M3, or even to hold the stay 5 at the intermediate passage point M3 by elastic pinching between the arch 63 and the second lateral wall 16 and, on the other hand, when a sufficiently intense tension is exerted on the stay 5, to release said stay 5 and / or allow said stay 5 to pass through the constriction 60, to allow said stay 5 either to sink deeper into the groove 12, or to extract itself from said groove 12.

[0175] As can be seen in Figures 10, 11 and 13, the spring-blade 61, and more particularly its arch 63, preferably has, on the one hand, a first ramp 64, forming an insertion ramp, which guides the stay 5 in the F_in direction of insertion into the groove 12, up to the constriction 60 defining the intermediate passage point M3, and which thus allows the stay 5 to reach, and then pass through, the constriction 60 towards the bottom 13 of the groove 12, and on the other hand, a second ramp 65, forming an extraction ramp, which guides the stay 5 in the F_out direction of extraction out of the groove 12, and which thus allows the stay 5, when it has been previously inserted beyond the constriction 60 in the direction of insertion F_in, and is therefore entirely in the zone of the core 10 located between the constriction 60 and the bottom 13 of the groove 12, to cross said constriction 60 again in the opposite direction, here the extraction direction F_out,towards the mouth 14 and the receiving surface 10_out. ,

[0176] The spring-blade 61 flexes elastically, relative to the sole 62, to allow the arch 63 to accompany the movements of the stay 5, and more particularly to disappear when the stay 5 is inserted into the constriction 60, or, even more so, when the stay 5 passes through the constriction 60, in the direction of penetration F_in or in the direction of extraction F_out.

[0177] According to a second variant of the arrangement, illustrated in figures 14, 15 and 16, the stop 21 includes a finger 70 which is fixed in the core 10 and which is provided with a spherical tip 71, which spherical tip 71 protrudes into the groove 12, from the first lateral wall 15 delimiting the groove 12, and is interrupted at a non-zero distance, noted "W72", from the second lateral wall 16 in order to create, between the surface of the spherical tip 71 and the second lateral wall 16, an air gap 72 which forms the constriction 60.

[0178] More preferably, the finger 70 may have a cylindrical body 73 with a circular base, the cylindrical body 73 being followed by a neck 74, and the spherical tip 71 then follows the neck 74.

[0179] The cylindrical body 73 may advantageously be threaded, so that it can be inserted and fixed in the core 10 by screwing.

[0180] As can be seen in particular in [Fig.14], the spherical tip 71 preferably has a sphere diameter D71 which is greater than the minimum diameter D74 of the neck 74 which precedes said spherical tip 71, so that said spherical tip 71 creates an enlargement with respect to said neck 74.

[0181] Finger 70 then has a shape reminiscent of a bowling pin.

[0182] In addition, the minimum diameter D74 of the neck is preferably strictly less than the diameter D73 of the cylindrical body 73.

[0183] Furthermore, in particular to facilitate the mounting of the finger 70 in the core 10 by allowing the insertion of the finger 70 through an opening which opens transversely into the groove 12, the diameter D71 of the spherical tip 71 is preferably at most equal to, or even less than, the diameter D73 of the cylindrical body 73.

[0184] Thus, ultimately, we prefer: D74 < D71 < D73, or even: D74 <D71 = D73.

[0185] The presence of the collar 74, here preferably a frustoconical collar 74 coaxial with the cylindrical body 73 of the finger 70, advantageously allows, as can be seen in [Fig. 16], for the finger 70 to be prevented, when the stay 5 enters and is driven into the groove 12, from interfering with the stay 5 before said stay 5 reaches the spherical tip 71 and the constriction 60, in the direction of the insertion F_in. Thus, the finger 70 is prevented from prematurely jamming the stay 5 before said stay 5 reaches the desired intermediate point M3, or even from damaging said stay 5.

[0186] Advantageously, the shape of the collar 74 ensures that the stay 5 comes into contact with the finger 70 at the spherical tip 71, and therefore with the rounded and convex surface, consequently non-cutting and non-abrasive, of the finger 70.

[0187] More generally, it should be noted that the use of a spherical point 71, by nature devoid of abrasive reliefs or cutting edges, allows the stay 5 to come into contact with the stop 21, here more particularly with the finger 70, and to slide without damage along said stop 21, here on the rounded surface of the spherical point, to reach or even pass through the constriction 60, and this both in the direction of penetration F_in and in the opposite direction F_out of extraction, and whatever the angle at which the stay 5 approaches the stop 21.

[0188] As an indication, the diameter D71 of the spherical tip 71 will preferably be between 2.5 mm and 6.5 mm.

[0189] Preferably, the spherical tip 71 is in a fixed position on the finger 70, and more preferably formed in one piece with the body 73, even more preferably in one piece with the body 73 and the neck 74. The finger 70 thus has a simple and robust structure, inexpensive to manufacture.

[0190] The spherical tip 71, and more generally the finger 70, shall preferably be made of steel, for example an alloy steel such as 40 CrMnNiMo 8-6-4 or 34 CrNiMo 6. Such a choice makes it possible, in particular, to obtain a finger 70 that is particularly mechanically resistant, despite its relative thinness. In addition, the surface of the finger 70, and more particularly the surface of the spherical tip 71, shall advantageously be polished, preferably to achieve an arithmetic roughness Ra equal to or less than 0.4 pm, in order to minimize friction with the stay 5, and to prevent any abrasion of the latter.

[0191] Advantageously, the use of a finger 70, or several fingers 70 at the rate of one finger per groove 12, makes it possible to make a compensator 20 particularly robust, and makes it possible to make a fixed adjustment of the width W72 of the air gap 72, by simple choice of the positioning of the finger 70 in the core, and this individually for each groove 12.

[0192] In this respect, the cylindrical body 73 of the finger 70 may advantageously be threaded, so that it can be screwed into the core 10, in the desired position.

[0193] The width W72 of the air gap 72, that is to say the smallest non-zero distance which separates the spherical tip 71, and more particularly the outer surface of the spherical tip 71, from the second lateral wall 16, and which therefore defines the width of the passage left available for the stay 5 at the level of the constriction 60, is chosen strictly less than the corresponding nominal dimension of the cross section of the stay 5.

[0194] This allows the constriction 60 to cause the stay 5 to lock between the spherical tip 71 and the second lateral wall 16, and thus to stop the stay 5 at the desired intermediate passage point M3 when the stay 5 is inserted into the groove 12. This also allows the constriction 60 to cause the stay 5 to clamp, by pinching between the spherical tip 71 and the second lateral wall 16, when forces the engagement of the stay 5 in the air gap 72, and that the cross section of the stay 5 flattens slightly to adapt to the width W72 of said air gap 72.

[0195] The finger 70 thus makes it possible to temporarily hold, if necessary by a reversible pinching, the stay 5 at the intermediate passing point M3 whose position is defined by the position of the constriction 60.

[0196] The width W72 of the air gap 72 will depend in particular on the intensity of the longitudinal tension force which can be exerted without damage on the stay 5 to force the passage of said stay 5 through the air gap 72, in particular to free the stay 5 from the constriction 60, during the demolding operation.

[0197] As an indication, the width W72 of the air gap 72 may represent between 40% and 60% of the nominal diameter of the cross section of the stay 5.

[0198] Thus, the width W72 of the air gap 72 may preferably be between 0.2 mm and 1.2 mm, in particular when it is desired to use stays 5 whose cross section has a nominal diameter, before crushing in the air gap 72, of between 0.5 mm and 2 mm.

[0199] By way of example, the following could be considered for implementation: - a stay 5 having a diameter of 0.5 mm, a groove width W12 equal to 0.6 mm (i.e., 120% of the stay diameter) and a gap width W72 equal to 0.2 mm (i.e., 40% of the diameter of stay 5); or - a stay 5 having a diameter of 0.9 mm, a groove width W12 equal to 1.1 mm (i.e., 122% of the stay diameter) and a gap width W72 equal to 0.45 mm (i.e., 50% of the diameter of stay 5); or - a stay 5 having a diameter of 2 mm, a groove width W12 equal to 2.4 mm (i.e. 120% of the diameter of the stay) and a gap width W72 equal to 1.2 mm (i.e. 60% of the diameter of the stay 5).

[0200] The stay 5 will advantageously be chosen so as to be able to withstand without damage a crushing between the spherical tip 71 and the second lateral wall 16, to the extent necessary to cross the air gap 72 forming the constriction 60. For this purpose, it may be possible to opt for a stay 5 which will be formed of a polymer monofilament, or which will comprise one or more polymer strands, said polymer, being intrinsically deformable, being for example polyamide (“Nylon”), and / or to opt for a stay 5 which will have a multi-strand structure allowing a crushing by spatial rearrangement of the strands.

[0201] It should be noted that the use of a fixed finger 70 with a spherical tip 71 offers several advantages, particularly compared to the use of a spring-loaded blade 61. First, the roundness of the spherical tip 71 makes the stop 21 non-abrasive and non-cutting, both in the insertion direction F_in and in the extraction direction F_out. Second, the operation of such a finger 70 is advantageously passive, since it has no moving parts, which minimizes the risks of wear, misalignment or breakage of the stop 21. Finally, the fixed setting of the air gap 72 provided by such a finger 70 makes it possible to obtain perfectly reproducible operation from one making / unmolding cycle to another.

[0202] The operation of a compensator 20 with a constriction 60, applicable to both a compensator 20 using a spring-blade 61 and to a compensator 20 using a finger 70 with a spherical tip 71, will now be described more specifically, with reference to figures 17 to 19 which illustrate principles valid for each of these two variants.

[0203] During the installation of the stay 5, it enters the groove 12 through the opening 14, in the direction of the penetration F_in. The longitudinal tension exerted during installation on said stay 5, between the first anchor point M1 and the second anchor point M2, keeps said stay 5 taut, until it reaches the constriction 60, and thus comes into contact with the stop 21, at the intermediate passage point M3.

[0204] The stay 5, attached at the intermediate point M3, then bends to form a broken line, the first segment of which extends from the first anchor point M1 to the intermediate point M3, and the second segment from said intermediate point M3 to the second anchor point M2, as illustrated in [Fig. 17]. This creates the reserve of stay length, as explained above. This reserve of stay length Delta_L is here equal to the difference between, on the one hand, the cumulative length of the two sides [M1M3] and [M3M2] of the triangle M1M2M3 that are adjacent to the point M3 and, on the other hand, the length of the base [M1M2] of said triangle M1M2M3.

[0205] The longitudinal tension exerted in the stay 5 during installation is however chosen so as to be insufficient to allow said stay 5 to pass through the constriction 60, of which the stay 5 therefore remains captive, temporarily, during this step of installation of the stay 5.

[0206] During a first phase of the demolding step, at least one section of the wall 3 containing the second anchor point M2, here for example the first heel 42 of a bandage 40, is detached and moved away from the receiving surface 10_out of the core 10, thus forcing the first and second anchor points M1, M2 to move away from each other, which increases the tensile force exerted on the stay 5.

[0207] Under the effect of the increased longitudinal tension thus exerted in the stay 5, the resultant of the forces exerted, at the intermediate passage point M3, by each of the two segments [M1M3] and [M3M2] of the stay 5, adjacent to the intermediate passage point M3, becomes sufficient to force the stay 5 to pass through the constriction 60, in the direction of the indentation F_in, and to free oneself from said constriction 60, as illustrated in [Fig. 18].

[0208] The reserve of shroud length is thus released, giving slack to the shroud 5, and therefore allowing the shroud 5 to accompany without damage the increase in the distance which separates the second anchor point M2 from the first anchor point M1.

[0209] Then, during a second phase of the demolding step, the core 10 is extracted from the cavity 4 of the object 2, here from the bandage 40. This has the effect of moving the stay 5, relative to the core 10, in the direction of the extraction F_out, towards the mouth 14 of the groove 12.

[0210] In doing so, the stay 5 passes back through the constriction 60, and crosses this constriction 60 in the direction of extraction F_out, under the effect of the traction, here radial, by which the object 2 is separated from the core 10, here more particularly by which the core 10 is extracted from the band 40 in the direction of extraction D_extract. The stay 5 is thus freed from the constriction 60, and therefore more generally from the stop 21, and can freely exit the groove 12 to accompany the demolded object 2, as can be seen in [Fig. 19].

Claims

1. Demands Tooling (1) intended for manufacturing an object (2), such as a pneumatic tire, comprising on the one hand a wall (3) having a concave internal surface (3_in) delimiting a cavity (4), and on the other hand at least one wire-like reinforcing element (5), called a "stay" (5), which passes through the interior of the cavity (4) so ​​as to connect a first anchor point (M1) located in a first portion (3_1) of the wall (3) to a second anchor point (M2) which is located in a second portion (3_2) of the wall (3), at a non-zero distance from the first anchor point (M1), said tooling (1) comprising a core (10) which materializes a volume, called a "reserved volume" (11), which corresponds to the cavity (4) of the object (2) and which is delimited by a convex external surface, called a "receiving surface" (10_out), which receiving surface (10_out) possesses a shape conjugate to the internal surface (3_in) of the wall (3) of the object (2),is intended to receive one or more constituent components of said wall (3) of the object (2), and thus determines a distance called the "base distance" (LO) between the first anchor point (M1) and the second anchor point (M2), said core (10) further comprising at least one groove (12) which is cut inside the reserved volume (11), from the receiving surface (10_out), so as to accommodate the stay (5), said tooling (1) being characterized in that it comprises a compensator (20) which includes 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 imaginary line, called the "base line" (DO), which passes through the first anchor point (M1) and the second anchor point (M2), so that the length (L5_tot) of the path 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), is strictly greater than the base distance (LO), which allows the compensator (20) to have a reserve of guy wire length which can be mobilized to allow the second portion (3_2) of the wall containing the second anchor point (M2) to move away from the first portion (3_1) of the wall containing the first point, anchoring (Ml) when the core (10) is extracted from the cavity (4).

2. Tooling according to claim 1 characterized in that the stop (21) is adaptive, in that said stop (21) allows a variation of the position of the intermediate passage point (M3) within the groove (12) in reaction to a variation of the intensity of the longitudinal tension which reigns in the stay (5), between the first anchor point (M1) and the second anchor point (M2).

3. Tooling according to claim 1 or 2 characterized in that the stop (21) is mounted movably in the groove (12) and is supported by an elastic member (22) so that said stop (21) is capable of ensuring elastic suspension of the stay (5) housed in the groove (12).

4. Tooling according to claim 3 characterized in that, the groove (12) being delimited by two solid lateral walls (15, 16) which face each other, which are secant to the receiving surface (10_out) and which define between them a groove width (W12) which is sufficient to allow the free passage of the transverse section of the stay (5), the stop (21) is formed by a ball (23) whose diameter is strictly greater than the width (W12) of the groove (12) and which is guided in sliding in a chamber (24) communicates with said groove (2) by a slot (25) which allows the stay (5) to engage the stop (21).

5. Tooling according to claim 3 or 4 characterized in that the elastic element 22 is formed by a helical spring (27).

6. Tooling according to one of the preceding claims characterized in that the intermediate passage point (M3) defined by the stop (21) is located in an area strictly contained between the base line (DO) on the one hand and the outline of the receiving surface (10_out) on which the groove (12) opens on the other hand.

7. Tooling according to claim 6 and one of claims 3 or 4 characterized in that the elastic member (22) is arranged so as to be able to push the stop (21) against the stay (5), in the direction of the receiving surface (10_out).

8. Tooling according to any one of the preceding claims, characterized in that the core (10) comprises a plurality of grooves (12) spaced apart from each other and each intended to accommodate a separate stay (5), and in that the compensator (20) comprises a plurality of stops (21), each of said stops (21) being intended for one of said grooves (12).

9. Tooling according to claim 8 characterized in that the compensator (20) comprises a cartridge (30) which is inserted removably into the core (10) in a direction called "insertion direction" (D30) which is transverse to the lateral walls (15, 16) delimiting the different grooves (12), and which comprises a plurality of chambers (24) each containing a stop (21) moved by an elastic member (22), each chamber (24) being provided with a slot (25) which is arranged to align with the corresponding groove (12) of the core (10) in order to allow the relevant stay (5) to reach the stop (21) located in said chamber (24).

10. Tooling according to any one of the preceding claims characterized in that the reserve of stay length (Delta_L), equal to the difference between on the one hand the length L5_tot of the path 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 base distance (L0), is between 3% and 30% of the base distance (L0), and / or between 3 mm, minimum value, and 30 mm, maximum value.

11. Tooling (1) according to any one of the preceding claims, characterized in that it constitutes tooling for manufacturing a toroidal tire (40) comprising a crest (41) for forming a tread, a first annular bead (42) and a second annular bead (43) designed to allow the tire (40) to be attached to a mounting support such as a rim, as well as a first flank (44) and a second flank (45) which connect the crest (41) respectively to the first bead (42) and the second bead (43), the crest (41), the first and second flanks (44, 45) and the first and second bead (42, 43) together forming the wall (3) having the concave internal surface (3_in) which delimits the cavity (4) of the tire (40), in that the core receiving surface (10_out) has a toroidal shape which is centered on an axis central (Z10) and which includes a radially external apex zone (51),intended to receive constituent components of the apex (41) of the bandage (40), and, on either side axially of said apex zone (51), a first lateral zone (52) folded towards the central axis (Z10) and intended to receive constituent components of the,

12.

13. first flank (44) and first heel (42) and a second lateral zone (53) folded back towards the central axis (Z10) and intended to receive constituent components of the second flank (45) and second heel (43), in that the core (10) comprises a plurality of grooves (12) which are distributed in azimuth around the central axis (Z10) and arranged to allow the passage, through the cavity, of stays (5) which each connect a first anchor point (M1), called the "summit anchor point", located in the apex (41) of the bandage, to a second anchor point M2, called the "lateral anchor point", located in one of the flanks (44, 45) or heels (42, 43) of the bandage (40), and in that the compensator (20) associates with each groove (12) of the plurality of grooves (12) a stop (21), preferably suspended by an elastic element (22), in order to create a reserve of stay length in said groove (12). Tooling according to any one of claims 1, 6, 8, 10 or 11, characterized in that the stop (21) is arranged to operate by threshold effect, so as to, depending on the stresses exerted on the stay (5), either retain the stay (5) at an intermediate passing point (M3), resisting the movement of the stay (5), or, under the effect of a stress greater than a predetermined threshold, release and / or allow the stay (5) to pass through to allow the latter to change its position in response to the stress. Tooling according to any one of claims 1, 6, 8, 10, 11 or 12, characterized in that, the groove (12) being delimited by a first solid lateral wall (15) and a second solid lateral wall (16) facing each other, which are intersecting the receiving surface (10_out) and which define between them a groove width (W12) which is sufficient to allow the free passage of the cross-section of the stay (5), the stop (21) defines, with the second lateral wall (16), a constriction (60) which is narrower than the cross-section of the stay (5), so as to be able, on the one hand, to stop the sinking of the stay (5) into the groove (12) at the intermediate passage point (M3) by blocking the stay (5) between the stop (21) and said second lateral wall (16), and on the other hand, when a sufficiently intense tension is exerted on the stay (5),release said stay (5) to allow said stay (5) either to penetrate further into the groove (12) or to be extracted from said groove (12).

14. Tooling according to claim 13 characterized in that the stop (21) comprises a finger (70) which is fixed in the core (10) and which is provided with a spherical tip (71) which projects into the groove (12) from the first lateral wall (15) delimiting the groove (12) and which is interrupted at a non-zero distance from the second lateral wall (16) in order to create, between the surface of the spherical tip (71) and the second lateral wall (16), an air gap (72) which forms the constriction (60).

15. Tooling according to claim 13 characterized in that the stop (21) comprises a spring-blade (61) which is carried by a base (62) fixed to the first lateral wall (15), said spring-blade (61) having an arch (63) which forms a curve towards the second lateral wall (16), opposite the first lateral wall (15), such that said arch forms, with the second lateral wall (16), the constriction (60), said spring-blade (61) being elastically deformable so as to be able, on the one hand, to retain the stay (5) at the intermediate point of passage (M3), or even to hold the stay (5) at the intermediate point of passage (M3) by elastic pinching between the arch (63) and the second lateral wall (16) and, on the other hand, when sufficiently intense tension is exerted on the stay (5), to release said stay (5) and / or allow said stay (5) to cross the constriction (60),to allow said stay (5) either to penetrate further into the groove (12), or to be extracted from said groove (12).

16. A method of manufacturing an object in 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), against the stop (21), then at least one component is placed on the receiving surface (10_out) to form the wall (3), then the object (2) is demolded by separating a first portion of the wall (3_1) containing a first anchoring point (M1) of the stay (5) and a second portion of the wall (3_2) containing a second anchoring point (M2) of the stay (5), to allow the extraction of the core (10) out of the cavity (4) delimited by the wall (3).

17. The method according to claim 16, characterized in that the manufactured object (2) is a bandage (40) whose wall (3) is formed from one or more rubber-based components, and in that, at this Finally, the stays (5) are placed on the core (10), in the grooves (12), the said rubber-based component(s), intended to form the wall (3), are placed in the raw state on the receiving surface (10_out) of the core, then the core (10) fitted with the stays (5) and the wall (3) is subjected to a cooking operation allowing the rubber-based wall component(s) to be vulcanized, then the bandage (40) is demolded by separating, by elastic deformation, the second portion of the wall (3_2) from the first portion of the wall (3_1) and by extracting the core (10) from the cavity (4) delimited by the said wall (3).

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