Core for manufacturing a tire reinforced by stays, comprising a stop compensator intended to facilitate the removal of the tire from the mold

Abstract

The present invention relates to a tool for manufacturing an object, such as a pneumatic tire, which comprises a wall (3) delimiting a cavity (4) as well as at least one stay which runs through the inside of the cavity so as to connect a first anchor point (M1) located in a first portion (3_1) of the wall to a second anchor point (M2) located in a second portion (3_2) of the wall, said tool comprising a core (10) provided with at least one groove (12) accommodating the stay, and a compensator (20) which comprises a stop (21) for constituting a spare stay length which can be used 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 removed from the cavity.

Description

CORE FOR THE MANUFACTURE OF A TIRE REINFORCED BY SHUTTERS COMPRISING A COMPENSATOR WITH STOPS INTENDED TO FACILITATE THE DEMOLDING OF THE TIRE

[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 which delimits a cavity and on the other hand filiform reinforcements forming stays which extend through the cavity of the object in order to connect a portion of the wall to another portion of the wall.

[0002] The present invention relates more particularly to the manufacture of pneumatic tires which, to improve their drifting behavior, are provided with stays which extend within the toric inflation cavity which delimits the tire, and which each connect a first anchoring point located in the top of the tire to a second anchoring point located in the sidewall or in the bead of the tire.

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

[0004] Although such tooling is generally satisfactory, the inventors have nevertheless noted that the demolding step, during which the core is extracted from the cavity of the bandage, after curing said bandage, could present a certain complexity, in particular with regard to the need to subdivide the core into a plurality of elements, and to successively move these different elements 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 propose an improved manufacturing tool which makes it possible to manufacture an object reinforced by stays while simplifying the demolding of said object.

[0006] The objects assigned to the invention are achieved by means of a tool intended to manufacture an object, such as a pneumatic tire, which comprises on the one hand a wall which has a concave internal surface delimiting a cavity, and on the other hand at least one filiform reinforcing element, called a "stay", which crosses the interior of the cavity so as to connect a first anchoring point located in a first portion of the wall to a second anchoring point which is located in a second portion of the wall, at a non-zero distance from the first anchoring point, said tool comprising a core which materializes a volume called "reserved volume" which corresponds to the cavity of the object and which is delimited by a convex external surface, called "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 "base distance" between the first anchoring point and the second anchoring point,said core further comprising at least one groove which is hollowed out inside the reserved volume, from the receiving surface, so as to accommodate the stay, said tooling being characterized in that it comprises a compensator which comprises a stop which is intended to cooperate with the stay and which creates, inside the groove, a point called the "intermediate passage point" which is located outside the fictitious straight line, called the "base straight line", which passes through the first anchoring point and the second anchoring point, so that the length of the path followed by the stay in the groove, from the first anchoring point to the second anchoring point via the intermediate passage point defined by the stop, is strictly greater than the base distance,which allows the compensator to have a reserve of guy 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, relative to the most direct path that the stay could theoretically adopt, in the absence of a stop, between the first anchoring point and the second anchoring point.

[0008] The compensator thus stores in the groove an excess length of stay 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 theoretical minimum length, called "basic distance", which said stay would travel if said stay followed a straight, direct path through the groove, between the first anchor point and the second anchor point, without making a detour via the intermediate crossing point.

[0009] Advantageously, this excess length forms a reserve of stay which is in particular available 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 separated from the second portion of the wall of the object, in order to open the cavity more widely and thus allow the core to be extracted from said cavity.

[0010] Thus, the temporary increase, during demolding, of the distance which separates the first anchoring point from the second anchoring 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 makes it possible to "unfold" or "straighten" the stay 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 straight line which joins, at the instant in question, and in particular at the time of demolding, the first anchor point to the second anchor point.

[0012] The compensator is thus capable of "giving 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 crossing 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 envisage the extraction of the core from the cavity in an extraction direction with respect to which the wall of the object initially forms a counter-face. draft which, in the absence of a compensator allowing the stay to be extended, and therefore in the absence of the possibility of moving the wall portions of the object apart from each other, would make 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 member, 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, during demolding, for the temporary increase in the distance which separates the first anchoring point from the second anchoring point thanks to a movement of the stop which collapses elastically, against the elastic member 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 subjected to traction by its anchoring points.

[0017] More generally, this suspended arrangement makes it possible to "unfold" or "straighten" the stay 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 straight line which joins, at the instant in question, 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 stay can be geometrically brought closer to a straight path.

[0018] Other objects, characteristics and advantages of the invention will appear in more detail on reading the description which follows, as well as with the aid of the appended drawings, provided for purely illustrative and non-limiting purposes, among which:

[0019] Figure 1 illustrates, in a perspective view with material cut away along a radial plane, an example of a braced pneumatic tire capable of being produced using a tool according to the invention.

[0020] Figure 2 illustrates, in an exploded perspective view, an element of a tool for producing the bandage of Figure 1.

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

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

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

[0024] Figure 6 illustrates, in a partial sectional view in a radial plane, the configuration of the stay and the compensator during a demolding step during which the sides and the beads of the bandage are separated to move them away from the top of the bandage, which also has the effect of separating the beads from each other along the central axis of the bandage, so as to allow the core to be extracted 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 the beads of the bandage.During this stage, each stop concerned pushes against its elastic member to allow the stay to unfold in order to increase its apparent length and thus to adjust said apparent length to the distance which increases, under the effect of the deflection of the wall which allows the widening of the neck, between the first anchor point located in the top and the second anchor point located in the side.

[0025] Figure 7 illustrates, in a partial sectional view in a radial plane, the configuration of the stay and the compensator at the end of the demolding step, the core being completely removed from the cavity of the tire, the stay being thus completely removed from the groove, and the sides and the heels of the tire having returned to their rest position, while, within the extracted core, the stop is, under the effect of the return exerted by the elastic member, in the rest position that said stop occupies in the absence of a stay pressing on said stop.

[0026] Figure 8 is a front view, in a plane normal to the central axis of the bandage, of a toric core used to manufacture the bandage of Figure 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 vaults, and said core being here in a configuration which corresponds to the step of demolding 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] Figure 9 illustrates, according to a partial sectional view in a radial plane, during the demolding step of a first sector as illustrated in Figure 6, the configuration of the stays and the compensators in a second sector which is still in place within the cavity of the bandage, and which is distinct from and immediately adjacent to said first sector.

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

[0029] Figure 11 is a longitudinal sectional view of the compensator of Figure 10.

[0030] Figure 12 illustrates, in a partial view, the principle of installation within a core, in two neighboring grooves, of two leaf spring compensators of the type shown in Figures 10 and 11.

[0031] Figure 13 is a sectional view of the arrangement shown in Figure 12, in a sectional plane containing the longitudinal axis of a compensator, to show the interaction between the leaf spring, the side wall of the groove and the stay.

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

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

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

[0035] Figure 17 illustrates, in a partial sectional view in a radial plane, the initial configuration of the stay and a compensator according to Figures 10 to 13, during a step of making the bandage of Figure 1, where the wall of the bandage matches the receiving surface of the core, and the spring-blade stop, with which each groove considered is equipped, retains the stay at the intermediate passage point 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 sectional view in the same sectional plane as Figure 17, a first phase of the demolding step, during which the heel of the tire begins to be forced to flex elastically to move away from the top of the tire, in order to allow the core to begin to extract itself radially from the cavity of the tire by passing through the neck delimited by the heels. In doing so, the traction exerted on the stay reaches a sufficient intensity to force the stay to cross the constriction formed by the stop, which releases the stay and therefore allows said stay to leave the intermediate passage point and continue its progression freely towards the bottom of the groove, which makes it possible to give slack to said stay. It will be noted that, just after being released from the constriction, the stay is advantageously loose, thus fully utilizing the reserve length which has been created by the compensator.

[0037] Figure 19 illustrates, in a partial sectional view in the same sectional plane as Figures 17 and 18, a second phase of the demolding step, during which the elastic bending of the sidewalls and the beads of the bandage is accentuated to move them away from the top of the bandage, which has the effect of further separating the beads 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 passage in the form of a neck delimited by the sides and heels of the bandage. In doing so, the stay, substantially stretched between the side and the top, crosses again 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 the destination of the object 2, the object 2 targeted by the invention comprises, as is notably clearly visible 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 filiform reinforcing element 5, called “stay” 5, which crosses the interior of the cavity 4 so as to connect a first anchoring point M1 located in a first portion 3 1 of the wall 3 to a second anchoring point M2 which is located in a second portion 3 2 of the wall 3, at a non-zero distance from the first anchoring point M1.

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

[0041] The stay 5 advantageously has a certain flexibility, so as to be able to flex without damage, in particular during the manufacture of the object 2, but a quasi-inextensibility in the direction of its length, considered from the first anchoring point M1 to the second anchoring point M2, so that, once the object 2 has its definitive functional configuration, typically once the pneumatic tire 40 is mounted on a rim and inflated to the required pressure, the stay 5 is in a taut state, extending rectilinearly from the first anchoring point M1 to the second anchoring point M2, and prevents the second portion 32 of the wall of the object from moving away from the first portion 31 of said wall of the object, which makes it possible to stiffen the object 2. As indicated in the preamble, in the case where the object 2 is a pneumatic tire, the presence of the stay makes it possible to reduce the drift phenomenon linked to the elasticity of the sides of the bandage.

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

[0043] For information purposes, the threadlike nature of the stay 5 is such that the length of the portion of the stay 5 which extends into the cavity 4, i.e. the length of the stay 5 considered along the path formed by the stay 5 from the first anchoring point M1 to the second anchoring point M2, is preferably at least ten times, preferably at least twenty times, or even at least fifty times greater than the maximum width of said stay, i.e. the largest dimension of the transverse section of the stay 5.

[0044] The stay 5 has at least one section which is embedded in the first portion 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 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 anchoring point M1 corresponds to the point of the internal surface 3_in of the wall 3 of the object 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 anchoring point M2 corresponds to the point of the internal surface 3_in of the wall 3 of the object 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 varied nature, shapes and dimensions.

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

[0047] Whatever the shape or the destination 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 method of manufacturing an object 2 which firstly comprises a manufacturing step during which the wall 3 of the object 2 is shaped on the tool 1 from one or more components based on raw rubber, i.e. unvulcanized, then a curing step during which the object 2 is cured in order to vulcanize said wall 3, then finally a demolding step during which the object 2 is separated from the tool 1, after the curing operation.

[0048] As is clearly visible in Figures 2, 5, 6 and 7, the tool 1 comprises a core 10 which materializes a volume 11, called “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 “receiving surface” 10 out, which receiving surface 10 out has a shape conjugated 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 “base distance” LO 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 possibly be provided with reinforcing threads embedded in a layer of rubber. Said components will be placed so as to match 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 made of 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 comprises at least one groove 12 which is hollowed out 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 into the volume of the core 10 and which opens onto the receiving surface 10 out by a mouth 14 so that it is possible, before said groove 12 is covered and masked by components constituting the wall 3, to engage the stay 5 in said groove 12 simply by sliding said stay 5 into said groove 12, from the outside of the core 10, so that said stay 5 passes through the receiving surface 10 out through the mouth 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, outside the opening formed by the mouth 14 of the groove 12, respectively, if there are several grooves, outside the openings formed by said grooves.

[0054] Preferably, the groove(s) 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 mouth portion 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 mouth portion 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 mouth 14 of said groove 12 by which said groove 12 opens onto the receiving surface 10 out, extends, at the receiving surface 10 out, continuously at least over the entire length of the receiving surface 10 out which goes from the first mouth portion 14A to the second mouth portion 14B. More particularly, the mouth 14 of the groove 12 extends, at the receiving surface 10 out, continuously from the position of the first anchoring point M1 to the position of the second anchoring 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 in FIG. 5.The first anchoring point M1 and the second anchoring point M2 are thus presented, during the step of making the object 2, and more particularly the wall 3 of the object 2, each facing a mouth portion 14A, 14B of the groove 12.

[0057] According to the invention, the tool 1 comprises a compensator 20 which comprises a stop 21 which is intended to cooperate with the stay 5 and which creates, inside the groove 12, a point M3 called the “intermediate passage point” M3 which is located in the groove 12 and outside the fictitious straight line D0, called the “base straight line” D0, which passes through the first anchoring point M1 and the second anchoring point M2, so that the length L5_tot of the path followed by the stay 5 in the groove 12, from the first anchoring point M1 to the second anchoring point M2 via the intermediate passage point M3 defined by the stop 21, is strictly greater than the base distance L0, which allows the compensator 20 to have a reserve of guy 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 inserting the stay 5 into the groove 12, then making the object 2 on the core 10, the stay 5 comes to bear 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 base line D0 is defined by the nominal positions of the first and second anchoring points M1, M2, that is to say by the positions occupied by the first and second anchoring points M1, M2 during the making of the object 2, when the first wall portion 31 and the second wall portion 32 are in contact with the receiving surface 10 out of the core 10 so that the internal wall 3_in matches said receiving surface 10 out.

[0060] Geometrically, the compensator 20 makes it possible to create a triangle M1M2M3 whose first anchor point M1 and the 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] Particularly preferably, the stop 21 is adaptive, in that said stop 21 allows a variation in the position of the intermediate passage point M3 within the groove 12 in reaction to a variation in the intensity of the longitudinal tension which prevails in the stay 5, between the first anchoring point M1 and the second anchoring point M2.

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

[0063] According to one possible implementation, this elastic behavior will allow the stop 21 to operate by a threshold effect, according to which said stop 21, depending on the stresses exerted on the stay 5, will be able to alternately either retain the stay 5 at an intermediate passage point M3, by resisting the movement of the stay 5, or on the contrary, by elastically retracting under the effect of a stress greater than a threshold predetermined, release and / or allow the stay 5 to pass to allow the latter to modify its position in response to the request.

[0064] It would thus be possible, for example, to provide a stop 21 in the form of a curved leaf spring, which would have a sole, fixed to a first side wall 15 delimiting the groove 12, and an arch carried by the sole and forming a bulge in the direction of a second side wall 16 delimiting the groove 12, opposite the first side wall 15, so that said arch, elastically deformable and forming at rest with the second side wall 16 a constriction which is narrower than the transverse dimension of the stay 5, could stop the sinking of the stay 5 into the groove 12 at the intermediate passage point M3, or even maintain the stay 5 at the intermediate passage point M3 by elastic pinching between the arch and the second side wall 16, and, when sufficiently intense traction is exerted on the stay 5, release said stay 5 and / or allow said stay 5 to cross the constriction, either to sink deeper into the groove 12,either to extract itself from said groove 12.,

[0065] According to another possible implementation, to which reference will preferably be made in the following, 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, when the object 2 is being made on the core 10, the stay 5 comes to bear against the stop 21 and can push said stop 21 against the return force generated by the elastic member 22, over a pushing distance which depends, among other things, on the stiffness of said elastic member 22 and the longitudinal tension exerted in the stay 5 during the installation of the stay 5.

[0067] When, after the wall 3 of the object has been formed on the core 10, the second portion 32 of the wall is forced apart from the first portion 31 of the wall, so as to straighten the wall 3 to further open the cavity 4 in order to allow the core 10 to pass through to carry out the demolding, as illustrated in FIG. 6, an additional traction is generated on the ends of the stay 5 which are located respectively at the first anchoring point M1 and at the second anchoring point M2, and therefore the longitudinal tension in the stay 5 is increased.

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

[0069] To do this, it is in particular 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 move closer to the fictitious straight line which connects the first anchor point M1 to the second anchor point M2 at the instant in question.

[0070] If the stop 21 is elastically suspended, 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 any time to the spacing distance which separates the first anchoring point M1 from the second anchoring point M2.

[0071] Thanks to this flexibility of the intermediate crossing point M3, the compensator 20 is in fact able, geometrically, to bring the third vertex M3 closer to the base [M1M2] of the triangle M1M2M3, thus reducing the height of the triangle which comes 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 extent necessary and sufficient to accompany the separation movement which moves the first anchor point M1 and second anchor point M2 away from each other.

[0072] It will also be noted that the compensator 20 here advantageously forms a tensioning device which, thanks to the return force exerted by the elastic member 22, makes it possible to keep the stay 5 in tension between the first anchoring point M1 and the intermediate passage point M3 on the one hand, and between the intermediate passage point M3 and the second anchoring point M2 on the other hand, that is to say to keep a stay 5 which is rectilinear in pieces, on each of the two sides [M1M3], [M3M2] of the triangle which are formed by the stay 5 opposite the base [M1M2]. It will be noted that, here, the sides of the triangle which are occupied by the stay 5 preferably form the two short sides of said triangle, each being of a length less than the length of the base [M1M2] which then forms the long side of the triangle.

[0073] Maintaining tension in the two pieces of the stay 5 forming the sides [M1M3] and [M3M2] makes it possible in particular to order the stay 5 within the groove 12, both during the manufacturing step, including the installation of the stay 5 and then the installation of the components constituting the wall 3 of the object 2, and during at least part of the demolding operation. This avoids in particular any risk of jamming or tangling of the stay 5, in particular during the demolding step.

[0074] According to the invention, the reserve of stay length, denoted “Delta L”, is advantageously constituted by means of the compensator 20 during the initial insertion of the stay 5 into 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 anchoring point M2 from the first anchoring point M1, in relation to what this distance is initially, namely in relation to the basic distance L0 which is initially defined by the core 10 during the step of making the wall 3.

[0075] It will be noted that, advantageously, the compensator 20 makes it possible not only to compensate for a forced increase in the distance separating the second anchoring point M2 from the first anchoring 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(s) constituting the stay 5, and which is caused by a curing step which is carried out after the step of making the wall 3 and before the demolding step.

[0076] The stay length reserve 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 basic distance L0: Delta L = L5_tot - L0

[0077] In the aforementioned triangular configuration, according to which the stay 5 is tensioned so as to form rectilinear segments from the first anchor point M1 to the intermediate crossing point M3 first and then from the intermediate crossing 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 short sides [M1M3] and [M3M2] of the triangle and on the other hand the initial length of the base [M1M2] of the triangle, it being recalled that said initial length of the base [M1M2] is the base distance LO as defined by the shape and dimensions of the core 10 and which separates the first anchoring point M1 located in the first wall portion 3 1 from the second anchoring point M2 located in the second wall portion 3 2 when said first and second wall portions 3 1, 3 2 match the receiving surface 10 out of said core 10.

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

[0079] Preferably, alternatively or cumulatively with the relative proportions indicated above, the stay length reserve Delta L may be comprised, in absolute value, between 3 mm, minimum value, and 30 mm, maximum value, for example between 10 mm, minimum value and 18 mm, maximum value preferably between 12 mm and 15 mm.

[0080] This dimensioning of the Delta L length reserve, and more particularly the low values ​​(minimum values) chosen for said Delta L length reserve, advantageously makes it possible to have sufficient excess stay length 5 in stock in the groove 12, at the end of the manufacturing step and before the possible baking step and the demolding step, that is to say sufficient initial excess stay length, so that the stay 5 can then undergo without damage: - a possible intrinsic shortening of said stay 5 caused by thermal shrinkage, during the baking step, while the first and second anchoring points M1, M2 are held by the core 10 at a fixed distance from each other, in this case at the basic distance L0 from each other, and, above all, - an extension of the effective distance which separates the first and second anchoring points M1, M2, caused by the forced separation of the first and second wall portions 31, 32, when at least one of said first and second wall portions 31, 32 is detached and separated from the receiving surface 10 out of the core 10 during the demolding step.

[0081] This same dimensioning of the Delta L length reserve, and more particularly the high values ​​(maximum values) chosen for said Delta L length reserve, advantageously make it possible to limit the initial excess length of the stay 5 in such a way that, after the demolding operation, and once the object 2 has been 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 wall portion 3 1 and the second wall portion 3 2, are in a configuration such that the initial excess length of the stay is absorbed, that is to say that the stay 5 extends in a rectilinear manner, and therefore in a substantially taut manner, in the cavity 4, from the first anchoring point M1 to the second anchoring point M2, and can thus exercise its stay function, by opposing the relative distance of the first and second anchoring points M1, M2, and therefore by retaining the second wall portion 3 2 relative to the first wall portion 3 1 and vice versa.

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

[0083] This makes it possible to equip the object 2 with a plurality of guy wires 5, each of which extends from a first anchoring point M1, distinct from the first anchoring points M1 of the other guy wires 5, to a second anchoring point M2, distinct from the second anchoring points M2 of the other guy wires 5. The object 2 thus has, as is notably the case in FIG. 1, a series of first anchoring points M1 and a series of second anchoring 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 a mouth 14 which forms a continuous opening along the profile of the receiving surface 10 out, from the first portion of the wall 31 to the second portion of the wall 32, and more particularly from the first anchoring point M1 of the stay 5 associated with the groove 12 considered to the second anchoring point M2 of said stay 5.

[0085] When the core 10 comprises a plurality of grooves 12, the compensator 20 then preferably comprises, as is notably visible 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 5-stay will be offered a M3 crossing point giving said 5-stay a reserve length, which will be usable in particular during the demolding operation.

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

[0088] This being the case, it is not excluded to consider a collective elastic member 22, shared by several movable stops 21.

[0089] It will be noted that, in the present application, reference is preferably 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 can preferably apply, in an analogous 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 side walls 15, 16 which face each other, which intersect 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 preferably extends continuously from the mouth 14 of the groove 12 to the bottom 13 of said groove 12.

[0092] Said side walls 15, 16, which can preferably be parallel to one another, advantageously make it possible to guide the stay 5 inside the groove 12, and to limit the transverse movement of said stay 5, in particular when said stay 5 is engaged with the movable stop 21.

[0093] For information purposes, the largest dimension of the cross-section of the stay 5, i.e. the diameter of the stay 5 when said stay 5 is formed by a wire or a cable having a cross-section of circular shape, 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 specifically, since the diameter of the stay 5 is known, a sizing rule can be applied which consists of choosing a groove width W12 equal to the diameter of the stay 5 increased by 10% to 30%, for example increased by 20%.

[0096] For information purposes, alternatively or cumulatively with the ranges of relative values ​​mentioned above, the width W12 of the groove 12 may 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 is notably visible in figures 2, 3, 4 5 and 6.

[0098] The stop 21 thus forms a cursor which is mounted mobile 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 the slot 25 is superimposed on the groove 12 to allow the stay 5 to slide into the chamber 24 in order to come 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 side walls 15, 16, without risk of jamming, when the stop 21 moves under the combined action of a longitudinal traction exerted on the stay 5 and the return force exerted by the member elastic 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 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 damaging the stay 5 by abrasion or cutting the stay 5, and a spherical shape which ensures sliding of the stop 21 inside the chamber 24 without jolts or seizure.

[0102] The direction D21 of movement of the stop 21, and more particularly the direction of translation of the cursor formed here by the ball 23, such that this direction of translation is defined by the chamber 24, is preferably parallel to the side walls 15, 16 of the groove 12, and perpendicular or substantially perpendicular (at + / - 5 degrees, for example) to the base line D0.

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

[0104] It is of course possible to envisage 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 branch of which supports the stop 21, here the ball 23, against the stay 5.

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

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

[0107] Furthermore, it makes it possible to easily choose a stiffness of the elastic member 22 which is adapted to the stay 5 and the core 10 used.

[0108] Preferably, the preload of the elastic member 22, which here is a preload in compression against the stop 21 and therefore against the sinking of the stay 5, can be adapted by means of a calibration 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 provide for closing the chamber 24 by means of a threaded cylinder head which will provide a dual function by forming, opposite the slot 25, on the one hand a closure member having the function of preventing 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 having the function of adjusting the compression preload of the elastic member 22, here the helical spring 27.

[0110] The prestress of the elastic member 22 may preferably be chosen equal to or greater than the foreseeable intensity of the force that the stay 5 exerts on the stop 21, against said elastic member 22, when the stay 5 is placed 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 being pushed in during the operation of installing the stay 5, and will only give way and push in, against the elastic member 22, at the time of the demolding operation, when the longitudinal tension in the stay 5 is increased by pulling on the second wall portion 3 2. Thus, it will be possible to advantageously define precisely, and in a reproducible manner, the position of the intermediate passage point M3 when installing the stay 5.

[0111] Here, said intermediate passage point M3 will in fact 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 is clearly visible in FIG. 5, located in a zone which is strictly between the base line D0 on the one hand and the outline of the receiving surface 10 out onto 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 anchoring point M1 and the second anchoring point M2, then the interception of the stay 5 by the stop 21 occurs automatically, slightly below the receiving surface 10 out, thus imposing a bend on the stay 5, at the intermediate passage point M3, so that the stay 5 cannot reach a direct rectilinear 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 completely stretched and merge with the basic straight line DO.

[0115] If the stop 21 is suspended, the elastic member 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 member 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 return the stay 5 in the direction of the mouth 14 of the groove 12, and therefore in the direction of the receiving surface 10 out, opposite the bottom 13 of the groove 12.

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

[0118] More particularly, during the initial installation of the stay, the stop 21 sinks to a first degree of sinking, 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 moved away from the first portion of the wall 3 1 in order to proceed with the demolding, the stop 21 sinks further by compressing the elastic member 22, to reach a second degree of sinking, greater than the first degree of sinking, which makes it possible, as illustrated in FIG. 6, to reposition the intermediate passage point M3 so as to unfold the stay 5 to accompany the increase in the distance which separates the first anchoring point M1 from the second anchoring point M2.

[0119] Preferably, as illustrated in Figure 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 side 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 side walls 15, 16 delimiting the different grooves 12.

[0120] The cartridge 30 comprises a chamber 24 which contains a stop 21, preferably a ball 23, moved by an elastic member 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 member 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 stay 5 concerned 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 member 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 members 22 may be held in place inside the cartridge 30 by the solid part of the core 10 itself. To this end, the installation of the cartridge 30 will be carried out by iterations, each iteration comprising: a first step during which the following is introduced into the chamber 24 closest to the core 10 an assembly formed of a stop 21, here a ball 23, and an elastic member 22, here a helical spring 27, then a step during which the cartridge 30 is pushed inside the core 10, in the insertion direction D30, over a distance which corresponds 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 cylinder head, 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 member 22, here the helical spring 27, have been introduced into said chamber 24. The threaded cylinder head will thus provide support for the elastic member 22, here the helical spring 27, at one end of said elastic member 22 located opposite the end supporting the stop 21. Once the cartridge 30 is fitted with its stops 21 and elastic members 22, held by the threaded cylinder heads, the cartridge 30 as a whole can be inserted into the core 10.

[0127] Such an arrangement makes it possible, on the one hand, to easily handle the cartridge 30 without the risk of losing balls 23 or springs 27, since the threaded cylinder heads which close the chambers 24 retain these elements inside said chambers 24, and on the other hand to carry out an individual calibration of each elastic member 22, since the insertion of each threaded cylinder head into the corresponding chamber 24, by screwing, makes it possible to increase the prestress in compression of the elastic member 22, here of the helical spring 27.

[0128] Particularly preferably, the tool 1 will be intended for the manufacture of a toroidal bandage 40, such as that illustrated in FIG. 1, said toroidal bandage 40 comprising a crown 41 intended to form a tread, a first annular bead 42 and a second annular bead 43 designed to allow the bandage 40 to be attached to a mounting support such as a rim, as well as a first sidewall 44 and a second sidewall 45 which connect the crown 41 respectively to the first bead 42 and to the second bead 43; the crown 41, the first and second sidewalls 44, 45 and the first and second beads 42, 43 together form the wall 3 having the concave internal surface 3_in which delimits the cavity 4 of the bandage 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 e which is centered on a central axis Z 10 and which includes a radially external summit zone 51 intended to receive components constituting the top 41 of the bandage 40, and, on either side axially of said top zone 51, a first lateral zone 52 folded towards the central axis Z 10 and intended to receive components constituting 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 components constituting 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 Z 10, so that each rod will form, around the central axis Z 10, 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 Z 10, as can be seen in Figure 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 a possible arrangement, sectors 54, 55 could 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 receiving surface 10 out, all of the central blocks forming a crown called the “central crown”, - 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 receiving surface 10 out as well as a portion of the top zone 51 which axially extends the central portion of the top 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 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 one 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 top zone 51, thus providing a sector 54, 55 which has, in section in a radial plane containing the central axis Z10, a section in (capital Omega), as can be seen in Figures 5, 6 and 7. In practice, the implementation of a monolithic sector 54, 55 amounts to merging 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 will here form a first lobe 17, the central block, and the right ear, which will here form a second lobe 18.

[0135] It will be noted that, for simplicity of representation, Figure 2 represents a portion of a sector 54, 55, which may correspond in practice to an ear within the meaning of application WO-2022 / 200718. Of course, the arrangement illustrated in Figure 2, namely the implementation of a cartridge 30 as described above, can be found in a similar manner 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 appears in Figures 5, 6 and 7.

[0136] Preferably, the toroidal core 10 will be divided into twenty sectors 54, 55 around the central axis Z 10, even more preferably into ten sectors 54, 55 at the rate of five keys 54 and five vaults 55, as illustrated in figure 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 Z 10, as is clearly visible in FIG. 8, and which are arranged to allow the passage, through the cavity 4, of stays 5 which each connect, as is notably clearly visible in FIG. 1, a first anchoring point M1 called the “summit anchoring point” which is located in the top 41 of the bandage 40 to a second anchoring point M2 called the “lateral anchoring 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 sides 44, 45 or to one of the heels 42, 43 of the bandage 40.

[0139] Preferably, the first anchoring point M1 and the second anchoring 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 base line 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 bandage 40 a stop 21, preferably suspended by an elastic member 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 straight line, called the “base straight line” D0, 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 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 can be mobilized for allow sidewall 44, 45 or heel 42,43 containing the second anchor point M2 to move away from the vertex 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 member 22, preferably a helical spring 27, so that said stop 21 is capable of ensuring elastic suspension of the stay 5 at the intermediate passage 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 Z 10, and with respect to the axial part the widest of the cavity 4, a constriction, so that the first flank 44 and the second flank 45 form undercut faces relative 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 the “median radial plane” which contains the central axis Z10 as well as the bisector of the angle covered, around the central axis Z 10, 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 the passage of the sector 54, 55 which is to be extracted.

[0145] In this respect, the separation of the beads 42, 43 can be caused simply by forcing the elastic deformation of the first and second flanks 44, 45 of the tire under the effect of the thrust of the first and second lobes 17, 18 of the sector 54, 55 which executes the centripetal radial extraction movement, relative to the tire 40, in the extraction direction D extract. In this case, the first and second flanks 44, 45 and / or the first and second beads 42, 43 can slide on the lobes 17, 18, remaining in contact with the receiving surface 10 out, at least at the start of the extraction movement, as illustrated in FIG. 6.

[0146] Optionally, it could be envisaged to actively detach the first heel 42 from the first lateral zone 52 of the receiving surface 10 out while, simultaneously, detaching the second heel 43 from the second lateral zone 53 of the receiving surface 10 out, by exerting on said first and second heels 42, 43 opposite traction forces, in order to open a passage of suitable width in front of the sector 54, 55 concerned. For this purpose, it could for example be possible to force the separation of the heels using a suitable traction tool, distinct from the sector 54, 55 considered and engaging on said heels 42, 43.

[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 Z 10, the fact of locally moving a heel 42, 43 away from the position that said heel 42, 43 initially occupies on the receiving surface 10 out of the core, in the angular range occupied by the sector 54, 55 that it is desired to extract from the cavity 4 of the bandage 40, also has the effect of moving this same heel 42, 43 of the receiving surface 10_out in the neighboring sectors 54, 55, as illustrated in figure 9.

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

[0149] Now, advantageously, the compensator 20 is capable of restoring, when necessary, all or part of the reserve of stay length that said compensator 20 has constituted within the groove 12, and thus allows all the stays 5 concerned to adapt without damage to the variations, and more specifically to the increases, of the distance which separates the first and second anchoring points M1, M2, variations which are induced by the displacement of the heel 42, 43 concerned.

[0150] This compensation, and more particularly the unfolding of the stay 5, can advantageously occur in the sector 54, 55 which executes the demolding movement in the extraction direction D extract, while the top zone 51 of said sector 54, 55 detaches and moves away from the internal wall 3_in of the top 41 of the bandage, as illustrated in FIG. 6, but also in the sectors 55, 54 which are immediately adjacent to said sector executing the demolding movement, while said neighboring sectors 55, 54 are still in place in the cavity 4 of the bandage, the top zone 51 of each of said neighboring sectors 54, 55 still being in contact with the internal wall 3_in at the top 41 of the bandage, but the heels 42, 43 of said neighboring sectors 55, 54 are separated and thus detached from the lateral zones 52, 53 of the receiving surface 10 out, as illustrated in Figure 9.

[0151] Advantageously, the compensator 20 therefore allows all the stays 5 concerned to adapt flexibly to the traction, induced by the movement of the heel 42, 43, which is specific to them, both in the sector 54, 55 which executes the demolding movement in 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 relative to the core 10, permitted by the deformation of the elastic member 22, can advantageously be carried by a direction of movement D21 which is not parallel to the extraction direction D extract followed by the core 10.

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

[0154] According to this manufacturing method, 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 member 22, then at least one component is placed on the receiving surface 10 to form the wall 3, then the object 2 is demolded by separating from each other a first portion of the wall 31 containing a first anchoring point M1 of the stay 5 and a second portion of the wall 32 containing a second anchoring point M2 of the stay 5, to allow the extraction of the core 10 from 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 anchoring point M1 and the second anchoring point M2, so that the path followed by the stay 5 within the groove 12 forms a broken line, rectilinear in pieces, of which the intermediate passage point M3 forms a vertex.

[0156] This positioning of the stay 5 against the stop 21 can cause a certain recoil of said stop 21, in the direction D21 of movement, 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 receiving surface 10 out and intended to permanently integrate the wall 3 of the object 2, so as to form the first and second anchoring points M1, M2. This makes it possible to keep the stay 5 in tension while the core 10 is covered with components constituting the wall 3. According to a preferred embodiment, the anchoring structures will be formed by adhesive strips, for example strips of raw rubber, arranged on the core 10 respectively near the first mouth portion 14A through which the stay 5 enters the groove 12 and near the second mouth portion 14B through from which the stay 5 emerges from the groove 12, adhesive 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 spacing 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 3 of which is formed from one or more rubber-based components.

[0160] In this case, in accordance with the manufacturing method, the stays 5 are placed on the core 10, in the grooves 12, 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 furnished with the stays 5 and the wall 3 is subjected to a baking operation making it possible to vulcanize the rubber-based component(s) of the wall, 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 said wall 3.

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

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

[0163] In particular, as an alternative to the installation of raw rubber-based components and the aforementioned curing step, it could be envisaged to produce all or part of the object 2, and in particular all or part of the crown 41, the sides 44, 45 and / or the heels 42, 43 of the tire 40, by injection of a thermoplastic elastomer material, after having dressed the core 10, carrying the stays 5, by means of an appropriate injection mold.

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

[0165] It is of course possible to envisage a mixed process, combining a filling phase where solid rubber-based elements are placed on the core 10, and a thermoplastic elastomer material injection phase. The curing step could then occur before, simultaneously with, or after the thermoplastic elastomer material injection phase.

[0166] In all cases, the method then comprises, once the object 2 has been produced, here once the bandage 40 has been produced, a demolding step during which the core 10 is removed from the cavity 4 of the object 2 while leaving the stays 5 in place in said cavity 4, as is notably illustrated in the sequence of figures 5, 6 and 7.

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

[0168] In particular, as indicated above, it may be envisaged that the stop 21 is 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, by 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 modify 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 a possible embodiment which may constitute an invention as such, the groove 12 being delimited, as already mentioned above, by a first lateral wall 15 and a second lateral wall 16 which are solid and face each other, which are intersecting with 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 can advantageously define, with the second lateral wall 16, a constriction 60 which is narrower than the transverse section of the stay 5, as is notably visible in FIGS. 13 and 16, 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 side wall 16, as can be seen in Figures 13, 16 and 17, and on the other hand, when a sufficiently intense traction 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 in the direction of the bottom 13, as illustrated in Figure 18, or to extract itself from said groove 12, as illustrated in Figure 19, here by crossing the mouth 14 again to cross the receiving surface 10 out and thus disengage from the core 10.

[0170] For this purpose, according to a first arrangement variant, the stop 21 may comprise, as illustrated in FIGS. 10, 11 and 13, a leaf spring 61 which is carried by a sole 62 fixed to the first side 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 barrel may have a flat 62A arranged to be substantially flush with the first side wall 15.

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

[0174] Said spring blade 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 maintain the stay 5 at the intermediate passage point M3 by elastic pinching between the arch 63 and the second side wall 16 and, on the other hand, when sufficiently intense traction 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 more deeply into the groove 12, or to extract itself from said groove 12.

[0175] As seen in Figures 10, 11 and 13, the leaf spring 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 direction F in of insertion into the groove 12, up to the constriction 60 defining the intermediate passage point M3, and which therefore allows the stay 5 to reach, then cross, the constriction 60 in direction of 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 direction F out of extraction out of the groove 12, and which therefore allows the stay 5, when it has been previously pushed beyond the constriction 60 in the direction of the pushing F in, and is therefore entirely in the zone of the core 10 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, in the direction of 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 retract when the stay 5 is inserted into the constriction 60, or, even more so, when the stay 5 crosses the constriction 60, in the direction of insertion F in or in the direction of extraction F out.

[0177] According to a second arrangement variant, illustrated in figures 14, 15 and 16, the stop 21 comprises a finger 70 which is fixed in the core 10 and which is provided with a spherical tip 71, which spherical tip 71 projects into the groove 12, from the first side wall 15 delimiting the groove 12, and is interrupted at a distance, denoted “W72”, non-zero, from the second side wall 16 in order to create, between the surface of the spherical tip 71 and the second side 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 comes after 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 Figure 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 a widening relative to said neck 74.

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

[0182] Furthermore, 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 orifice 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] So, ultimately, we preferably have: D74 < D71 < D73, or even: D74 < D71 = D73.

[0185] The presence of the neck 74, here preferably a truncated cone-shaped neck 74 coaxial with the cylindrical body 73 of the finger 70, advantageously makes it possible, as can be seen in FIG. 16, to prevent, when the stay 5 enters the groove 12 and sinks into the groove 12, the finger 70 from interfering with the stay 5 before said stay 5 reaches the spherical tip 71 and the constriction 60, in the direction of sinking F in. Thus, it is possible to prevent the finger 70 from prematurely jamming the stay 5 before said stay 5 reaches the desired intermediate passage point M3, or even damaging said stay 5.

[0186] Advantageously, the shape of the neck 74 makes it possible to ensure that the stay 5 comes into contact with the finger 70 at the level of the spherical tip 71, and therefore the rounded and domed surface, consequently non-cutting and non-abrasive, of the finger 70.

[0187] More generally, it will be noted that the use of a spherical tip 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 tip, to reach or even cross the constriction 60, and this both in the direction of insertion 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 a single piece with the body 73, even more preferably in a single 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, will 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 which 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, will advantageously be polished, preferably to achieve an arithmetic roughness Ra equal to or less than 0.4 pm, in order to minimize the friction of the stay 5, and to avoid any abrasion of the latter.

[0191] Advantageously, the use of a finger 70, or of several fingers 70 at the rate of one finger per groove 12, makes it possible to produce a particularly robust compensator 20, and makes it possible to achieve a fixed adjustment of the width W72 of the air gap 72, by simply choosing 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 distance, non-zero, which separates the spherical tip 71, and more particularly the external surface of the spherical tip 71, from the second side 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 to be strictly less than the corresponding nominal dimension of the transverse section of the stay 5.

[0194] This allows the constriction 60 to cause a blocking of the stay 5 between the spherical tip 71 and the second side wall 16, and therefore a stopping of the stay 5 at the desired intermediate passage point M3 when the stay 5 is introduced into the groove 12. This further allows the constriction 60 to cause a tightening of the stay 5, by pinching between the spherical tip 71 and the second side wall 16, when the engagement of the stay 5 is forced into the air gap 72, and the transverse section of the stay 5 is slightly compressed 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 reversible pinching, the stay 5 at the intermediate passage point M3, the position of which 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 that it is known 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 transverse 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 transverse section has a nominal diameter, before crushing in the air gap 72, between 0.5 mm and 2 mm.

[0199] For example, we could consider implementing: - 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 an air gap width W72 equal to 0.2 mm (i.e. 40% of the stay diameter 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 an air gap width W72 equal to 0.45 mm (i.e. 50% of the stay diameter 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 stay diameter) and an air gap width W72 equal to 1.2 mm (i.e. 60% of the stay diameter 5).

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

[0201] It will be noted that the use of a fixed finger 70, with a spherical tip 71, has several advantages, in particular compared to the use of a spring blade 61. All firstly, the roundness of the spherical tip 71 makes the stop 21 non-abrasive and non-cutting, both in the direction of insertion F in and in the direction of extraction F out. Then, the operation of such a finger 70 is advantageously passive, since it does not include any moving parts, which minimizes the risks of wear, misadjustment or breakage of the stop 21. Finally, the fixed adjustment of the air gap 72 provided by such a finger 70 makes it possible to obtain perfectly reproducible operation from one manufacturing / demolding cycle to another.

[0202] The operation of a compensator 20 with a constriction 60, applicable both to a compensator 20 using a leaf spring 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] When installing the stay 5, it enters the groove 12 through the mouth 14, in the direction of the depression F in. The longitudinal tension that is exerted during installation on said stay 5, between the first anchoring point M1 and the second anchoring 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, held at the intermediate crossing point M3, then bends to form a broken line, the first segment of which extends from the first anchor point M1 to the intermediate crossing point M3, and the second segment of which extends from said intermediate crossing point M3 to the second anchor point M2, as illustrated in Figure 17. This makes it possible to create the stay length reserve, as already explained above. This stay length reserve 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 which are adjacent to the crossing 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 cross the constriction 60, in 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 anchoring 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, thereby forcing the first and second anchoring 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 which is 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 [M3 M2] of the stay 5, adjacent to the intermediate passage point M3, becomes sufficient to force the stay 5 to cross the constriction 60, in the direction of the depression F in, and to disengage from said constriction 60, as illustrated in FIG. 18.

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

[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 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 extraction direction 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 bandage 40 in the extraction direction 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 Figure 19.

Claims

CLAIMS 1. Tooling (1) intended to manufacture an object (2), such as a pneumatic tire, which comprises 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 filiform reinforcing element (5), called a "stay" (5), which passes through the interior of the cavity (4) so ​​as to connect a first anchoring point (M1) located in a first portion (3 1) of the wall (3) to a second anchoring point (M2) which is located in a second portion (3 2) of the wall (3), at a non-zero distance from the first anchoring 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 (lO out) has 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 anchoring point (Ml) and the second anchoring point (M2), said core (10) further comprising at least one groove (12) which is hollowed out inside the reserved volume, (11), from the receiving surface (10 out), so as to accommodate the stay (5), said tool (1) being characterized in that it comprises a compensator (20) which comprises a stop (21) which is intended to cooperate with the stay (5) and which creates, inside the groove (12), a point called the “intermediate passage point” (M3) which is located outside the fictitious straight line, called the “base straight line” (D0), 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 (L0), which allows the compensator (20) to have a reserve of stay 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 anchor point (M1) when the core (10) is extracted from the wall. of 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 in the position of the passage point. intermediate (M3) within the groove (12) in reaction to a variation in the intensity of the longitudinal tension which prevails in the stay (5), between the first anchoring point (M1) and the second anchoring point (M2).

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 side walls (15, 16) which face each other, which are intersecting with 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) communicating 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 member 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 a zone strictly between the base line (DO) on the one hand and the outline of the receiving surface (10 out) onto 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 one of the preceding claims, characterized in that the core (10) comprises a plurality of grooves (12) spaced apart from each other and intended to accommodate each 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 removably inserted into the core (10) in a direction called the “insertion direction” (D30) which is transverse to the side 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 stay (5) concerned to reach the stop (21) located in said chamber (24).

10. Tooling according to one of the preceding claims, characterized in that the stay length reserve (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 anchoring point (M1) to the second anchoring 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 one of the preceding claims, characterized in that it constitutes a tooling intended for the manufacture of a toroidal bandage (40) comprising a crown (41) intended to form a tread, a first annular bead (42) and a second annular bead (43) designed to allow the attachment of the bandage (40) to a mounting support such as a rim, as well as a first sidewall (44) and a second sidewall (45) which connect the crown (41) respectively to the first bead (42) and to the second bead (43), the crown (41), the first and second sidewalls (44, 45) and the first and second beads (42, 43) forming as a whole the wall (3) having the concave internal surface (3_in) which delimits the cavity (4) of the bandage (40), in that the receiving surface (10 out) of the core has a toroidal shape e which is centered on a central axis (Z 10) and which comprises a summit zone (51), radially external,intended to receive components constituting the top (41) of the bandage (40), and, on either side axially of said top zone (51), a first lateral zone (52) folded towards the central axis (Z 10) and intended to receive components, constituting the first sidewall (44) and the first heel (42) as well as a second lateral zone (53) folded towards the central axis (Z10) and intended to receive components constituting the second sidewall (45) and the second heel (43), in that the core (10) comprises a plurality of grooves (12) which are distributed in azimuth around the central axis (Z 10) and arranged to allow the passage, through the cavity, of stays (5) which each connect a first anchoring point (M1), called "summit anchoring point", located in the top (41) of the bandage, to a second anchoring point M2, called "lateral anchoring point", located in one of the sides (44, 45) or the 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 member (22), in order to create a reserve of stay length in said groove (12).

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 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 the latter to modify its position in response to the stress.

13. 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 side wall (15) and a second side wall (16) which are solid and face each other, which are intersecting with 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) defines, with the second side wall (16), a constriction (60) which is narrower than the transverse 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 side wall (16), and on the other hand, when a sufficiently intense traction is exerted on the shroud (5),releasing said stay (5) to allow said stay (5) either to sink deeper 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 side wall (15) delimiting the groove (12) and which is interrupted at a non-zero distance from the second side wall (16) in order to create, between the surface of the spherical tip (71) and the second side 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 leaf spring (61) which is carried by a sole (62) fixed to the first side wall (15), said leaf spring (61) having an arch (63) which forms a bulge in the direction of the second side wall (16), opposite the first side wall (15), so that said arch forms, with the second side wall (16), the constriction (60), said leaf spring (61) being 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 maintain the stay (5) at the intermediate passage point (M3) by elastic pinching between the arch (63) and the second side wall (16) and, on the other hand, when sufficiently intense traction is exerted on the stay (5), to release said stay (5) and / or to authorize said guy wire (5) to cross the constriction (60),to allow said stay (5) either to sink deeper into the groove (12) or to extract itself from said groove (12)., 16. A method of manufacturing an object during which a tool (1) according to any one of the preceding claims is used, a stay (5) is placed in each groove (12) of the core (10), 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 from each other 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) from the cavity (4) delimited by the wall (3).

17. Method according to claim 12 characterized in that the object (2) manufactured is a bandage (40) whose wall (3) is formed from one or more rubber-based components, and in that, for this purpose, the stays (5) are placed on the core (10), in the grooves (12), 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 baking operation making it possible to vulcanize the rubber-based component(s) of the wall, 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 said wall (3).

Images