A core with grooves arranged in a herringbone pattern for the production of a tire with stays.

Abstract

The present invention relates to a tool (1) for manufacturing a tire (40), the tool comprising a core (10) having a central axis (Z10) and subdivided into a series of sectors (54, 55), each of which comprises a plurality of grooves (12) designed to receive stays (5) each intended to connect a first fastening point (M1) to a second fastening point (M2) to reinforce the tire (40), and each sector (54, 55) is arranged to be movable in a direction called an “individual extraction direction” (D_extract), the direction extending within an individual angular range (A54, A55) over which the sector (54, 55) extends and is perpendicular to the central axis (Z10).

Description

Technical Field

[0001] The present invention relates to the manufacture of toroidal tires, more specifically to the general field of manufacturing toroidal pneumatic tires intended to be mounted on the wheels of vehicles.

Background Art

[0002] In order to improve the behavior of pneumatic tires, especially cornering, the applicant has considered using a filamentary reinforcement called a "stay" that extends into an annular expansion cavity that defines the boundary of the tire and that connects each of the attachment points located on the sidewall or bead of the tire to an attachment point located on the crown of the tire.

[0003] To manufacture such a tire having stays, the applicant has already proposed in International Publication No. WO 2022 / 20718 a tool comprising an annular core having a shape conjugate to that of the wall defining the boundary of the cavity of the tire and in which grooves designed for the passage of the stays are embedded.

[0004] Such a tool is generally satisfactory, but it has a certain complexity because it requires the core to be disassembled into a number of parts that each need to be individually withdrawn along a very special demolding path so that the core can be withdrawn from the tire without damaging the stays. In particular, it is provided that the core is axially redissected into three annular subassemblies, namely a central ring forming the crown of the core and two peripheral rings called "lags" that are arranged adjacent to the central ring on both sides of the central ring to receive the sidewalls and shoulders of the tire, and each of these three subassemblies is itself angularly decomposed azimuthally around the central axis of the core into a plurality of separate sectors, which are more numerous in the lags than within the central ring.

Prior Art Documents

Patent Documents

[0005] [Patent Document 1] International Publication No. 2022 / 200718 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] The diversity of core components and the complexity of their respective extraction movements naturally tend to make the demolding process and, therefore, the manufacturing process of tires with stays in general, relatively redundant and quite inefficient on an industrial scale.

[0007] Therefore, the object of the present invention is to overcome the aforementioned drawbacks and to provide an improved tool that simplifies the manufacturing process of a tire reinforced with a stay and thus improves the efficiency of the manufacturing process. [Means for solving the problem]

[0008] The object of the present invention is achieved using a tool for manufacturing a toroidal tire, which includes a core that forms a volume called a “retaining volume” corresponding to the cavity of the tire, which is outwardly bounded by a convex toroidal surface called a “receiving surface” that includes a radially outer crown zone centered on the central axis and intended to receive components of the crown of the tire, which on both axial sides of the crown zone include a first lateral zone curved inward toward the central axis and intended to receive components of the first side wall and first bead of the tire, and a second lateral zone curved inward toward the central axis and intended to receive components of the second side wall and second bead of the tire, which also includes a plurality of grooves distributed at azimuthal angles around the central axis and embedded from the receiving surface into the retaining volume, so that each of these grooves has an opening that extends continuously along the profile of the receiving surface from a first opening located in the crown zone to a second opening located in one of the first and second lateral zones, and so that each of these grooves is spaced apart from each other at azimuthal angles The housing is formed by a first and second lateral wall, both of which intersect with the receiving surface, with the boundary defined at an azimuth angle around the central axis, and each groove can receive thread-like reinforcing elements called "stays" between the first and second lateral walls into the inside of the housing, between the first and second lateral walls, which enter the groove through a first opening and exit the groove through a second opening, and these stays permanently incorporate the structure of the tire and extend through the cavity of the tire to a first fixing point called a "crown fixing point" located on the crown of the tire, between the first and second side walls of the tire. Designed to connect to a second attachment point called a “lateral attachment point” located on one of the first and second beads, the tool divides the core into a series of sectors by azimuth angles around the central axis, each covering a predetermined azimuth angle range called an “individual angular range” around this central axis, and at least one of these sectors, and preferably each of these sectors, is removed from the tire along a direction called an “individual pull-out direction” that is located within the individual angular range occupied by this sector and is perpendicular to the central axis.The grooves are arranged to be movable relative to adjacent sectors, and the multiple grooves located in the same sector, preferably all of the grooves, are arranged in a configuration called a “radially pullable configuration,” in which, in a projection into a plane called a “reference tangent plane,” which is perpendicular to the individual pull-out directions of the sector in question and tangent to the radially outermost part of the crown zone of the receiving surface of this sector in question, the first transverse wall of each of these multiple grooves is located at a distance from the first side of a hypothetical straight line called a “baseline” passing through the first and second fixing points of the stay received in the groove in question, while the second transverse wall is located at a distance from the baseline on the second side opposite to the first side of this baseline, so that the first and second transverse walls do not interfere with the volume swept by the stay when the stay is aligned with the baseline in an orthographic projection into the reference tangent plane, and so that the relative movement carried out by the individual pull-out directions of the sector is generated between the stay and this sector.

[0009] Advantageously, by orienting the lateral walls of grooves located in one and the same sector of the core according to one and the same common direction corresponding to the individual pull-out directions of the sector in question, the tool according to the present invention allows the sector in question to be pulled out of the tire after the tire has been constructed and, where appropriate, after the tire has hardened, by a centripetal radial pull-out movement oriented according to the individual pull-out directions and thus perpendicular to this central axis in a radial plane containing the central axis of the core and the individual pull-out directions, while all the stays present in this sector are allowed to slide out of the groove along this same individual pull-out direction without the lateral walls of the groove obstructing the passage of the stays. In other words, particularly when the sector is pulled out of the tire cavity, the lateral walls of the groove do not cause any forced deviation of this stay in the azimuthal angle and therefore do not generate any transverse forces on the stay, thereby advantageously avoiding the generation of excessive longitudinal tension in this stay that could potentially tear the stay or break the stay under tension. Similarly, this also avoids situations where the lateral walls of the groove generate significant friction or even shear effects on the surface of the stay, which could weaken or even tear the stay.

[0010] The arrangement provided by the present invention thus advantageously avoids any damage to the stays and, more generally, any damage to the tires that would otherwise occur during the demolding operation through wear, breakage, or tearing of the stays.

[0011] Furthermore, the arrangement according to the present invention enables the creation of a tool and, more specifically, a core with a simplified structure, since the invention allows the use of sectors that each cover the entire axial range of the receiving surface and thus the entire axial width of the tire from the first side wall to the second side wall, and each can move in a single block along the individual pull-out direction. That is, during the demolding stage, the entire portion of the tire that occupies the individual angular range to which the sector in question is assigned can be released in a single move, by performing a simple movement in this case in the centripetal radial translation along the individual pull-out direction of the sector in question.

[0012] The sector withdrawal movement can be easily electrified and further automated without any risk to the integrity of the stay and tire, thereby significantly improving the precision, repeatability, and speed of the demolding operation and, more generally, the efficiency of the method of manufacturing the tire.

[0013] Further objects, features, and advantages of the present invention will become apparent in more detail from reading the following description and from referring to the accompanying drawings provided purely for non-limiting illustrative purposes. [Brief explanation of the drawing]

[0014] [Figure 1] This figure shows an example of a pneumatic tire reinforced with stays, which can be produced using the tools according to the present invention, in a perspective view having a radial plane cross-section. [Figure 2]This figure shows a perspective view of the core of a tool according to the present invention, in which the core comprises 10 sectors forming an annular assembly, including 5 sectors called "keys" that are accessible from the radially inward and designed to be removed first along their own pull-out radial direction during the dismantling of the annular assembly, and 5 sectors called "arches" that are supported and locked in place by the keys and, after being released by the removal of the keys, are designed to be operable along their own pull-out radial direction. [Figure 3] This is a front view of the core shown in Figure 2, projected onto a plane perpendicular to the central axis. [Figure 4] Figures 2 and 3 are top views of the core in reference tangent plane, where the reference tangent plane is perpendicular to the radial bisector plane of the upper sector of the core, and the upper sector corresponds to the arch in this case. [Figure 5] Figure 2 is a perspective view of the core, and to more clearly show the orientation of the grooves, a virtual gauge plane has been added that defines the passages open for stays between the lateral walls of the grooves. In the illustrated arrangement, the first and second lateral walls of the same groove extend along a plane parallel to each other and coincide with its virtual gauge plane. [Figure 6] Figure 5 is a partial front view of the upper core component projected onto a plane perpendicular to the central axis, showing the corresponding sector, in this case the arch, the corresponding groove, and the virtual gauge plane. [Figure 7] Figures 5 and 6 are partial top views of the core in a reference tangent plane perpendicular to the radial bisecting plane of the arch sector, which in particular shows the arch sector, the end of the adjacent key sector, and the associated groove and virtual gauge plane, and it is clear that all virtual gauge planes belonging to this same arch sector and therefore all the lateral walls of the groove embedded in this arch sector in this case extend parallel to the individual pulling directions of the arch sector, in this case the individual pulling directions are perpendicular to the plane of the figure. [Figure 8] Figures 2-7 show detailed perspective views of key sectors separated from the core. [Figure 9]Perspective view of the key sector of FIG. 8, with an added depiction of a virtual gauge plane that embodies a passageway retained within the groove for the stay. [Figure 10] Front view of the key sector of FIG. 8 in a plane perpendicular to the central axis of the core. [Figure 11] Bottom view of the key sectors of FIGS. 8 and 10 in a plane perpendicular to the respective extraction directions of the key sectors, i.e., revealing the radial inner surface of the key sector as viewed from the central axis. [Figure 12] Top view of the key sectors of FIGS. 8, 10, and 11 in a reference tangent plane perpendicular to the respective extraction directions of the key sectors, where the reference tangent plane is perpendicular to the radial plane that forms the bisecting plane of the key sector in this case. [Figure 13] Diagram schematically showing the principle of generating a stay from a single continuous thread engaged with a serpentine-shaped continuous passageway, where in this case, the loops forming the alternating extreme values of the serpentine shape are intended to form the lateral fixing points of the stay. [Figure 14] Perspective view of the core of FIG. 1, where within this core, the key sectors shown in FIGS. 8 - 12 are removed through a centripetal radial translation along their respective extraction directions according to the movements executed to extract this sector from the tire cavity during the mold release operation. [Figure 15] Front view of the core of FIG. 14 in a plane perpendicular to the central axis. [Figure 16]Figure 1 shows the initial configuration of two stays in two grooves with respect to the core in Figure 2 during the tire assembly stage, with the tire wall fitting to the receiving surface of the core, and each stay extending from the crown fixing point to the lateral fixing point. In this case, the two stays form a continuous thread that extends to the second side wall of the tire, from where the first stay enters the first groove through the first side wall of the tire and passes through the crown of the tire, and then the second stay exits the second groove and immediately enters, with this crown incorporating a portion of the thread that forms the joint between the first stay exiting the first groove and the second stay re-entering the second groove. In the arrangement shown herein, compensators are also provided in the grooves, each compensator including a stop formed in this case by a spring-suspended ball, which makes it possible to form a stay length retainer within each groove, which can be mobilized so that the tire bead moves axially away from the receiving surface of the core and thus apart from each other, in order to release the tire so that the widest portion in the axial direction of the sector can pass through without damaging the stay as the sector of the core performs its radial removal movement along its individual pull-out direction and exits the tire cavity. [Figure 17] This is a partial cross-sectional view in the radial plane showing the configuration of stays and compensators during the demolding stage, which causes the tire sidewall and bead to separate and move away from the tire crown, and also has the effect of moving the beads away from each other along the tire's central axis so that the core sectors can be pulled out of the tire cavity along individual pull-out directions perpendicular to the central axis through a passage in the form of a neck, which is bounded by the tire sidewall and bead. During this stage, each stop in question is pressed against its spring in order to unfold the stay and increase its visible length, and thus to match its visible length to the distance between the first fixing point located on the crown and the second fixing point located on the sidewall, which is increasing under the wall deflection effect that allows the neck to widen. [Figure 18]It is a partial cross-sectional view in the radial plane showing the structure of the stay and the compensator after the release stage. The sector with the core problem has been completely removed from the cavity of the tire, that is, the stay has been completely removed from the groove, and the sidewalls and beads of the tire have been returned to their rest positions by elastic recovery. In the extracted sector, the stop is positioned at the no-load position occupied by the stop when there is no pressing of the stay against the stop under the return action exerted by the spring. [Figure 19] It is an enlarged partial view of the core in FIG. 2. [Figure 20] It is a view showing the structure of the stay and the compensator during the release stage in a partial cross-sectional view of the radial plane. It is still in a fixed position within the cavity of the tire and in the second sector separated from and directly adjacent to the first sector, where it has been pulled out of the cavity as shown in FIG. 17 with respect to its components.

DETAILED DESCRIPTION OF THE INVENTION

[0015] The present invention relates to a tool 1 for manufacturing a toroidal tire 40 as shown in FIG. 1.

[0016] Such a toroidal tire 40 includes a crown 41 intended to form a tread in a manner known per se, a first annular bead 42 and a second annular bead 43 each reinforced by at least one annular bead wire and designed to be able to mount the tire 40 on a mounting support such as a rim, and a first sidewall 44 and a second sidewall 45 connecting the crown 41 to the first bead 42 and the second bead 43, respectively.

[0017] The crown 41, the first and second sidewalls 44, 45, and the first and second beads 42, 43 together form a wall 3 having a concave inner surface 3_in. This wall 3 defines the boundary of the cavity 4 of the tire 40, and the cavity 4 is intended to receive an inflation fluid such as air under a pressure higher than atmospheric pressure to keep the tire 40 in an inflated state.

[0018] Tool 1 includes a core 10 as shown in Figures 2, 3, 14, 15, 16, and 19, which forms a volume called a “retained volume” 11 corresponding to the cavity 4 of the tire 40.

[0019] The core 10 is externally bounded by a convex toroidal surface called the "receiving surface" 10_out, which has its center on the central axis Z10.

[0020] The central axis Z10 of the core actually coincides with the central axis of the tire 40, and the tire 40 has a shape that exhibits rotational symmetry with respect to this central axis, which substantially corresponds to the axis of rotation of the wheel that accepts the tire 40. This central axis Z10 defines three directions conventionally used by those skilled in the art: the axial direction, the radial direction, and the circumferential direction.

[0021] The expression "axial direction" is understood to mean the direction parallel to the central axis Z10 of the core 10, that is, the direction parallel to the rotation axis of the tire 40.

[0022] The term "radial direction" is understood to mean the direction extending along the radius of core 10, that is, the direction intersecting and perpendicular to the central axis Z10.

[0023] The expression "circumferential direction" is understood to mean a direction perpendicular to the radius that is contained within a plane perpendicular to the central axis Z10 and is itself perpendicular to the central axis Z10; in other words, an orthogonal direction perpendicular to the radial plane containing the central axis (Z10). That is, in a plane perpendicular to the central axis Z10, the circumferential direction at the point in question is the tangent of the circumference passing through that point, and the center of that circle lies on the central axis Z10.

[0024] The terms "meridian plane" P_MER or "radial plane" are understood to mean a plane containing a central axis Z10, where this central axis Z10 forms the first extension direction of the meridian plane, while the second extension direction of the meridian plane extends radially relative to the central axis Z10. In other words, such a meridian plane is perpendicular to the circumferential direction.

[0025] The term "equatorial plane" P_EQ refers to a plane perpendicular to the central axis Z10 and passing through the outermost radial point of the tire 40. Typically, the equatorial plane P_EQ is preferably located midway along the axial direction between the outermost axial points of the tire. That is, the equatorial plane P_EQ divides the tire 40 axially into two preferably substantially symmetrical toroidal halves, which are called "hemispheries" due to their analogy with the sphere of the Earth.

[0026] The receiving surface 10_out of the core 10 has a shape that is conjugate to the shape of the inner surface 3_in of the wall 3 of the tire 40 intended to be manufactured.

[0027] The receiving surface 10_out of the core 10 includes a radially outer crown zone 51 intended to receive components of the crown 41 of the tire 40, and on both axial sides of the crown zone 51, a first lateral zone 52 curved inward toward the central axis Z10 and intended to receive components of the first side wall 44 and first bead 42 of the tire 40, and a second lateral zone 53 curved inward toward the central axis Z10 and intended to receive components of the second side wall 45 and second bead 43 of the tire 40.

[0028] Typically, the components of the crown 41, the first and second side walls 44, 45, and the first and second beads 42, 43 will include rubber-based components such as rubber strips or rubber pies, more specifically, one or more components of the uncured rubber system, the pies and / or strips may be provided with reinforcing threads embedded in the rubber layer. These components are laid to cover the receiving surface 10_out and conform to the shape of the receiving surface 10_out in order to form the wall 3 of the tire 40, more specifically, the inner surface 3_in of the wall 3.

[0029] Preferably, considering the cross-section of the tire 40 in a radial plane containing the central axis Z10 in a known arrangement, the tire wall 3 has a shape that surrounds the core 10 and narrows as it progresses toward the central axis Z10, i.e., the minimum distance separating the inner surface of the first bead 42 from the inner surface of the second bead 43 in the axial direction is strictly less than the maximum axial width of the inner surface 3_in of wall 3 considered between the first side wall 44 and the second side wall 45. In other words, the first side wall 44 and the second side wall 45 define a neck between them, through which the core 10 must pass to be pulled out of the cavity, and the axial opening of this neck is preferably smaller than the total axial width of the receiving surface 10_out of the core 10, as can be seen particularly in Figures 16 and 18. In other words, the inner surface 3_in of the wall 3 of the tire 40 and the corresponding receiving surface 10_out of the core 10 preferably have an Ω (uppercase omega) shaped cross-section in the radial plane containing the central axis Z10, as can be seen in Figures 1, 8, 16, 17, and 18.

[0030] The core 10 is preferably made of metal, for example, steel. That is, the core 10 provides a rigid and robust receiving surface 10_out and can be reused for a long period of time to continuously manufacture many tires 40.

[0031] The core 10 also includes a plurality of grooves 12 that are distributed at azimuthal angles around the central axis Z10 and embedded in the retaining volume 11 from the receiving surface 10_out, so that each groove 12 has an opening 14 that extends continuously along the profile of the receiving surface 10_out from a first opening 14A located in the crown zone 51 to a second opening 14B located in one of the first transverse zones 52 and 2 transverse zones 53 of the receiving surface 10_out, as can be seen particularly in Figures 16 and 19.

[0032] Each groove 12 forms a housing whose boundaries are defined by a first transverse wall 15 and a second transverse wall 16 that are spaced apart from each other at an azimuth angle around the central axis Z10 and intersect the receiving surface 10_out. To this end, each groove 12 can receive a thread-like reinforcing element 5 called a “stay” 5 within the housing between the first transverse wall 15 and the second transverse wall 16, which enters the groove 12 through a first opening 14A and exits the groove 12 through a second opening 14B. The stay 5 is designed to permanently incorporate the structure of the tire 40 and to extend through the cavity 4 of the tire 40, connecting a first fixing point M1 (called the “crown fixing point”) located on the crown 41 of the tire 40 to a second fixing point M2 (called the “lateral fixing point”) located on either the first side wall 44 or the second side wall 45 of the tire 40 or to either the first bead 42 or the second bead 43.

[0033] It is advantageous that the stay 5 has a certain degree of flexibility so that it can be bent without damage, especially during the manufacture of the tire 40, but does not substantially stretch along its length when considering the distance from the first fixing point M1 to the second fixing point M2. Thus, when the tire 40 is in its final functional configuration, typically when the pneumatic tire 40 is mounted on the rim and inflated to the required pressure, the stay 5 becomes taut and extends linearly from the first fixing point M1 to the second fixing point M2. In this case, the taut stay 5 then advantageously prevents the crown 41 of the tire 40 from moving away from the sidewalls 43, 44 of the tire 40 and vice versa, thereby stiffening the tire 40, and in particular when a vehicle equipped with the tire 40 is cornering, the drift phenomenon associated with the elasticity of the sidewalls 43, 44 can be reduced.

[0034] Preferably, the stay 5 will be formed from a single-strand or multi-strand thread made of one or more strands of fabric material, polymer material such as aramid, or metal material. In one possible embodiment, the stay 5 is made from a composite thread produced from fiberglass and resin.

[0035] As a guideline, the filamentous characteristics of the stay 5 are such that the length of the portion of the stay 5 extending within the cavity 4, i.e., the length of the stay 5 considered along the line formed by the stay 5 from the first fixing point M1 to the second fixing point M2, is preferably at least 10 times, preferably at least 20 times, or at least 50 times the maximum width of the stay, i.e., the maximum dimension of the cross-section of the stay 5.

[0036] The stay 5 has at least one portion that is embedded in the first portion 3_1 of the wall 3 corresponding to the crown 41 and is incorporated into and fixed to the crown 41, and at least one other portion that is embedded in the second portion 3_2 of the wall 3 corresponding to one of the first side wall 44 and the second side wall 45 or one of the first bead 42 and the second bead 43 and is incorporated into and fixed to its side wall 44, 45 or its bead 42, 43.

[0037] By convention, the first fixing point M1 can be considered to correspond to a point on the inner surface 3_in of wall 3 such that the stay 5 emerges from the first portion 3_1 of wall 3 corresponding to the crown 41 and extends into the cavity 4 of the object, while the second fixing point M2 can be considered to correspond to a point on the inner surface 3_in of wall 3 such that the stay 5 emerges from the second portion 3_2 of wall 3 corresponding to its side walls 44, 45 or beads 42, 43 and extends into the cavity 4.

[0038] Preferably, the receiving surface 10_out is solid except for the opening formed by the mouth 14 of the groove 12.

[0039] Preferably, the groove 12 is a blind groove, meaning that the groove 12 has a solid bottom 13 located below the receiving surface 10_out within the retaining volume 11, as can be seen particularly in Figures 12, 16, and 18.

[0040] This solid bottom portion 13 extends through the retaining volume 11 from the first opening portion 14A of the groove 12 to the second opening portion 14B of the groove 12.

[0041] In fact, as can be seen in Figure 16, when the first portion 3_1 of the wall 3 corresponding to the crown 41 is in contact with the receiving surface 10_out, the first opening portion 14A is located next to the position occupied by the first crown fastening point M1, and when the second portion 3_2 of the wall 3 corresponding to its side walls 44, 45 or beads 42, 43 is in contact with the receiving surface 10_out, the second opening portion 14B is located next to the position occupied by the second lateral fastening point M2. This is particularly applicable during the assembly operation of the tire 40 in which the components of the crown 41, side walls 44, 45, and beads 42, 43 are laid on the receiving surface 10_out. Therefore, preferably, the groove 12, more specifically its opening 14, will extend along the receiving surface 10_out from at least the first fastening point M1 to the second fastening point M2.

[0042] As is clearly visible in Figures 2, 3, 14, and 15, the core 10 is subdivided by azimuth angles around the central axis Z10 into a series of sectors 54, 55, each sector encompassing a predetermined azimuth angle range A54, A55, which are called “individual angular ranges” A54, A55, around the central axis Z10.

[0043] As is clearly visible in Figures 15 and 17, at least one of these sectors 54, 55, preferably each of these sectors 54, 55, is positioned to move relative to adjacent sectors 55, 54 in order to remove it from the tire 40 along a direction called “individual extraction direction” D_extract, which is located in an individual angular range A54, A55 encompassed by sectors 54, 55 and is perpendicular to the central axis Z10.

[0044] Geometrically, each individual extraction direction D_extract thus intersects the central axis Z10 and forms a right angle with the central axis Z10. In an equivalent manner, each individual extraction direction D_extract in sectors 44 and 45 can be considered to correspond to a straight line that forms the intersection of the equatorial plane P_EQ and the meridional plane P_MER located within the individual angular ranges A44 and A45 covered by this sector in terms of azimuth angles around the central axis Z10.

[0045] In the present invention and as currently available, as is particularly evident in Figures 4, 7 and 12, a plurality of grooves 12, preferably all of the grooves 12, located in the same sectors 54, 55, arranged to move along the individual extraction directions D_extract described above, are arranged in a configuration called a “radially extractable configuration,” in which each of the plurality of grooves 12 is first in projection onto a plane called a “reference tangent plane” P_REF, which is perpendicular to the individual extraction directions D_extract of the sectors 54, 55 and tangent to the radially outermost part of the crown zone 51 of the receiving surface 10_out of the sectors 54, 55 The lateral wall 15 is positioned at a distance from the baseline on the first side of a virtual straight line called the "baseline" D0 that passes through the first and second fixing points M1 and M2 of the stay 5 received in the groove 12, while the second lateral wall 16 is positioned at a distance from the baseline on the second side opposite to the first side of the baseline D0. Therefore, the first lateral wall 15 and the second lateral wall 16 do not interfere with the volume swept by the stay 5 when the stay 5 is aligned with the baseline D0 in an orthographic projection onto the reference tangent plane P_REF, and relative movement carried out by the individual extraction directions D_extract of sectors 54 and 55 is generated between the stay 5 and sectors 54 and 55.

[0046] In other words, according to the present invention, when sectors 54 and 55 are driven relative to the tire 40 for one and the same linear translational movement carried out by each extraction direction D_extract, the stay 5 is able to move freely out of the groove 12 without being deviated in the azimuth angle by the side walls 15 and 16 of the groove 12.

[0047] Specifically, each groove 12 is advantageously initially located within the retaining volume 11 and, while aligned with the baseline D0 in projection onto the reference tangent plane P_REF, releases a passage containing a virtual volume obtained by a linear translation sweep along the individual extraction direction D_extract of the virtual body having transverse dimensions of the stay 5 passing through the first and second fixing points M1 and M2. This baseline D0 is determined by the nominal positions of the first and second fixing points M1 and M2, i.e., the positions of the first and second fixing points M1 and M2 during assembly of the tire 40 and therefore the positions occupied by the first and second fixing points M1 and M2 during and after assembly of the tire 40, when the crown 41 of the tire, the first and second beads 42 and 43, and the first and second side walls 44 and 45 of the tire are in contact with the receiving surface 10_out of the core 10 so that the inner surface 3_in conforms to the receiving surface 10_out.

[0048] Note that the baseline D0 is not parallel to the central axis Z0 because the crown fixing point M1 is located at a radial distance greater than the radial distance to the lateral fixing point M2 when viewed from the central axis Z0. As will be described later, it is even more preferable that the baseline D0 is included in the radial plane, in which case the baseline D0 intersects the central axis Z0. In that case, in that radial plane, the baseline D0 extends obliquely with respect to the central axis Z0 at a non-zero angle of inclination.

[0049] In practice, the implementation of the radially pullable configuration according to the present invention, when positioned on the reference tangent plane P_REF and the receiving surfaces 10_out of single sectors 54, 55 are viewed from the individual pull-out directions D_extract, results in all of the bottom 13 of the groove 12 being visible through the groove opening 14, as shown in Figure 12.

[0050] The housing, defined by grooves 12 in a single sector 54, 55 according to a radially pullable configuration, in this case preferably defined by all 12 grooves 12 in a single sector 54, 55, has a shape for receiving the stay 5, in other words, a shape from which all can be released in a single common direction, in this case a shape from which all can be released in the individual pull direction D_extract of the sectors 54, 55.

[0051] Preferably, each extraction direction D_extract is contained within the meridional plane that forms the bisecting plane of sectors 54, 55. The “bisecting plane,” denoted as “P_MER_BISECTOR,” refers to the radial plane containing the central axis Z10, which divides the individual angular ranges A54, A55 covered by sectors 54, 55 into two equal azimuthal angular subranges.

[0052] In the equatorial plane P_EQ perpendicular to the central axis Z10, considering the arc formed around the central axis Z10 by the radially outermost circumference of the receiving portion 10_out belonging to sectors 54 and 55, this arc defines angles corresponding to the individual angular ranges A54 and A55 covered by sectors 54 and 55 with respect to the central axis Z10. Each extraction direction D_extract is carried out by the angle bisector, i.e., the bisector of the individual angular ranges A54 and A55. As can be seen in Figures 3, 10, and 15, this bisector is a radial structure that starts from the central axis Z10, which forms the vertex of the angle, passes through the center of the arc, and divides the angular ranges A54 and A55 into two equal adjacent angles. In other words, the vertical reference plane P_REF is perpendicular to the bisector, i.e., perpendicular, and is tangent to the arc formed by a portion of the circumference of the receiving surface 10_out. Therefore, this reference plane P_REF is tangent to the arc at its center, and the center of the arc corresponds to the intersection of its bisector and the arc.

[0053] Of course, from an absolute standpoint, it is conceivable to use individual extraction directions D_extract that are not included in the bisector plane of sectors 44 and 45, but rather in the radial plane that is close to one of the ends of the individual angular ranges A54 and A55 covered by sectors 54 and 55, even though the radial plane is borne by the central axis Z10 and is perpendicular to the central axis Z10. In other words, in the front view in a plane perpendicular to the central axis Z10, the individual extraction directions D_extract will appear to be inclined with respect to the bisector plane.

[0054] However, it is considered that priority should be given to selecting individual extraction directions D_extract, which are centered on sectors 54 and 55, and are handled by the bisecting plane P_MER_BISECTOR.

[0055] In other words, it is preferable that the individual extraction directions D_extract of sectors 54 and 55 are carried out by straight lines formed by the intersection of the isomolecular meridional plane P_MER_BISECTOR and the equatorial plane P_EQ of sectors 54 and 55.

[0056] Such an arrangement centered on a bisecting plane simplifies the structure of the core 10, particularly the arrangement of dividing lines between adjacent sectors 54 and 55, and the management of pull-out movement. Furthermore, families of sectors 54 and 55, in this case the family of sectors forming the key 54 and the family of sectors forming the arch 55 as described later, can be manufactured, and these are substantially and more strictly identical to one another within a single family, that is, they are interchangeable among members of a single family within one and the same core 10, thereby simplifying the manufacturing and assembly of the core 10.

[0057] Similarly, sectors 54, 55 having a symmetrical arrangement with respect to their bisecting planes that form a sagittal plane can be manufactured in this way, thereby allowing these sectors 54, 55 to be positioned in one direction or the other within the core 10, and the first lateral zone 52 is interchangeable with the second lateral zone 53 without affecting the tire 40 in any way.

[0058] Preferably, as can be seen particularly in Figures 8 and 16, the sectors 54, 55 have a first convex lobe 17 on one side extending from the crown zone 51 to the first transverse zone 52 and including a first set of grooves 12, and a second convex lobe 18 on the other side extending from the crown zone 51 to the second transverse zone 53 and including a second set of grooves 12.

[0059] In this case, the first lobe 17 forms the left lobe in Figure 16, and the second lobe 18 forms the right lobe, positioned opposite the left lobe 17 with respect to the equatorial plane P_EQ. The first lobe 17 and the second lobe 18 ensure a gentle curved transition of the wall 3 between the tire crown 41 and the side walls 44, 45 in a zone located radially away from the central axis Z10 than the constricted portion that defines the rounded ridge of the tire cavity 4 and the neck defined by the beads 42, 43.

[0060] The first lobes 17 and the second lobes 18 of one and the same sectors 54, 55 are advantageously fixed to each other, preferably forming a one-piece assembly that as a whole is movable along the individual extraction direction D_extract of this sector 54, 55.

[0061] In other words, sectors 54 and 55 in question form a single, integrated block extending from one axial end to the other axial end of the inner surface 3_in of the tire, and have an Ω (uppercase omega) shaped cross-section in the radial plane containing the central axis Z10, as can be seen in particular in Figure 16.

[0062] The grooves 12 of the first set and the grooves 12 of the second set in sectors 54 and 55 are arranged according to the same radially extractable configuration determined based on the individual extraction direction D_extract.

[0063] In other words, advantageously, in one and the same centripetal radial movement undertaken by a single individual extraction direction D_extract common to all 12 grooves of the first and second sets, the entire portion of the core 10 that occupies the angular range A54, A55 and fills the cavity 4 of the tire from one end to the other in the axial direction of the cavity 4 can be extracted from the block.

[0064] It is therefore no longer necessary to decompose core 10, particularly sectors 54 and 55, axially and into several parts, each of which needs to be pulled out with a different movement.

[0065] Similarly, note that the grooves 12 of the first set of grooves 12 are preferably contained within the first hemisphere of the core 10 on one and the same side with respect to the equatorial plane P_EQ, and end axially before the equatorial plane P_EQ, while the grooves 12 of the second set of grooves 12 are contained within the other hemisphere of the core 10 on the opposite side with respect to the equatorial plane P_EQ, and end axially before the equatorial plane P_EQ.

[0066] In other words, the receiving surface 10_out has a solid central strip 56 in the crown zone 51, and when this central strip 56 connects sectors 54 and 55 to form the annular structure of the core 10, it forms an annular strip surrounding the central axis Z10, but this annular strip does not have the opening 14 of the groove 12 and is divided by the dividing line between adjacent sectors 54 and 55.

[0067] The central strip 56 advantageously receives and supports the portion of the stay 5 that forms the crown fixing point M1 away from the groove 12, and the tire component 41 into which the portion of the stay 5 that forms the crown fixing point M1 is inserted.

[0068] By a preferred feature that can itself constitute the definition of the present invention, each groove 12 arranged according to the radially pullable configuration releases a free space called a “useful passage” 19 in the entire portion of the retaining volume 11 extending from a position provided for the stay 5 within the groove 12 to the mouth 14 of the groove 12, the useful passage 19 extending from a first virtual gauge plane PG1 located at a distance from the baseline D0 on one side of the baseline D0 so as to be parallel to the individual pull direction D_extract and parallel to the baseline D0 and tangent to the first transverse wall 15, to a second virtual gauge plane PG2 located at a distance from the baseline D0 on the other side of the baseline D0 so as to be parallel to the first gauge plane PG1 so as to be parallel to the individual pull direction D_extract and parallel to the baseline D0 and tangent to the second transverse wall 16.

[0069] For easier understanding, gauge planes PG1 and PG2, respectively, perpendicular to the same reference tangent plane P_REF associated with sectors 54 and 55 are shown in Figures 5, 6, 7, and 9.

[0070] Each pair of the first gauge plane PG1 and the second gauge plane PG2 defines the boundary of the hollow void corresponding to the useful passage 19 into which the stay 5 is received.

[0071] Within each groove 12, which is configured to be radially pullable, the first transverse wall 15 and the second transverse wall 16 of the groove 12 are located outside the useful passage 19 and on both sides of the useful passage 19 as defined by the first and second gauge planes PG1 and PG2, that is, on both sides of the gap as defined by the boundary of the first and second gauge planes PG1 and PG2.

[0072] For this purpose, the first side wall 15 extends parallel to the first gauge plane PG1 and can coincide with the first gauge plane PG1, in particular, as in the cases of Figures 5, 6, 7, and 9.

[0073] Due to the deformation, the first lateral wall 15 can form a tapering angle with respect to the first gauge plane PG1, so that the first lateral wall 15 extends obliquely and gradually away from the first gauge plane PG1 on the side opposite to where the second gauge plane PG2 is located, in order to generate a housing that extends from the bottom 13 to the opening 14 of the groove 12.

[0074] Similarly, the second side wall 16 preferably extends parallel to the second gauge plane PG2 and, in particular, can coincide with the second gauge plane PG2, as in the cases of Figures 5, 6, 7, and 9.

[0075] In the deformation, the second lateral wall 16 can form a tapering angle with respect to the second gauge plane PG2, so that the second lateral wall 16 extends obliquely and gradually away from the second gauge plane PG2 on the side opposite to where the first gauge plane PG1 is located, in order to generate a housing that extends from the bottom 13 to the opening 14 of the groove 12. In one possible arrangement, each of the first lateral wall 15 and the second lateral wall 16 will have a tapering angle.

[0076] In all cases, it is advantageous that the first and second side walls 15, 16, which are preferably made of metal, have rigidity to ensure accurate guidance and positioning of the stay 5.

[0077] Preferably, the distance W19, called the "useful passage width" W19, that separates the second gauge plane PG2 from the first gauge plane PG1 is between 0.3 mm and 3 mm, preferably between 0.8 mm and 2.2 mm, for example between 1 mm and 1.8 mm, and more preferably between 1.1 mm and 1.3 mm.

[0078] In practice, the usable passage width W19 will be selected to be greater than or equal to the maximum transverse dimension of the stay 5, for example, 101% to 160% of the maximum transverse dimension of the stay 5, for example, 110% to 150%, and further 110% to 130%, for example, equal to 120% of the maximum transverse dimension of the stay 5.

[0079] More specifically, if the diameter of stay 5 is known, a dimensional determination rule can be applied, which essentially involves selecting a useful passage width W19 equal to the diameter of stay 5 plus 10% to 30%, for example, 20%.

[0080] As a guideline, the maximum cross-sectional dimension of the stay 5, i.e., the diameter of the stay 5 when it is formed by threads or cords having a circular cross-section, is preferably 0.3 mm to 3 mm, for example, 0.8 mm to 1.2 mm. This dimension can, of course, be adapted according to the size of the tire 40.

[0081] Preferably, the first transverse walls 15 and second transverse walls 16 of at least one groove 12 arranged according to a radially pullable configuration, preferably the first transverse walls 15 and second transverse walls 16 of each groove 12 arranged according to a radially pullable configuration, are planar and extend parallel to each other and parallel to the individual pull directions D_extract.

[0082] In other words, the first transverse wall 15 and the second transverse wall 16 can be generated along one and the same busbar corresponding to the individual extraction direction D_extract.

[0083] In fact, the arrangement in which the first and second side walls 15 and 16 that define the boundary of the single groove are planar and parallel to each other, and the precision of the azimuth angle of the width W19 of the useful passage 19 provided between these side walls 15 and 16, makes it possible to precisely position the stay 5 in terms of azimuth angle.

[0084] Such arrangement also allows for the easy formation of grooves 12 in single sectors 54, 55 using relatively simple machining processes, for example, by cutting with a saw of a width corresponding to the useful passage width W19, or by electrical discharge machining using a wire that is tensioned along a direction parallel to the baseline D0 and passed through the material of the core 10 along the individual extraction direction D_extract.

[0085] Furthermore, in such an arrangement, the first lateral wall 15 coincides with the first gauge plane PG1, the second lateral wall 16 coincides with the second gauge plane PG2, and the useful passage width W19 corresponds to the groove width W12, and in particular to the groove width W12 considered in the depth range of the groove 12 into which the stay 5 enters and is received during the construction stage of the tire 40.

[0086] As a guideline, the width W12 of the groove 12, especially the width at the position where the stay 5 is received during the assembly of the tire 40, is preferably 101% to 160% of the maximum transverse dimension of the stay 5, for example, 110% to 150%, and moreover, 110% to 130%, and equal to, for example, 120% of the maximum transverse dimension of the stay 5, and / or 0.3 mm to 1.3 mm in absolute terms, preferably 0.8 mm to 2.2 mm, for example, 1 mm to 1.8 mm, and moreover, 1.1 mm to 1.3 mm. Here, a dimensional rule can be applied to select the groove width W12 to be essentially equal to the diameter of the stay 5 plus 10% to 30%, for example, 20%.

[0087] Preferably, for each groove 12 arranged according to a radially pullable configuration, the first and second fixing points M1 and M2 of one and the same groove 12 are located at one and the same azimuth angle positions around the central axis Z10.

[0088] In other words, when stretched to their functional positions within the tire 40, each stay 5 extends in the same azimuth angle, and more generally in the same radial plane.

[0089] For each stay 5, the first fixing point M1 and the second fixing point M2 are positioned at the same azimuth angle, which has the effect that the baseline D0 is included in the radial plane, in this case the radial plane located at the common azimuth angle of the first and second fixing points M1 and M2 and therefore the radial plane containing the first and second fixing points M1 and M2. Furthermore, by combining this arrangement with the orientation of the groove 12 in the radially pullable configuration unique to the present invention, the appearance is such that the receiving surface 10_ou Due to the curvature of t, the front view in a plane perpendicular to the central axis Z10 has a curved shape, as can be seen in Figures 3, 6, 10, and 15, and its curvature increases as the distance of this groove 12 from the radial plane containing the individual extraction direction D_extract increases, that is, in this case, the groove 12 becomes the groove that shows the intersection line with the receiving surface 10_out, i.e., the mouth line 14, which increases as the distance of the groove 12 from the isomolecular meridional plane P_MER_BISECTOR of these sectors 54, 55 increases.

[0090] For similar reasons, note that when viewed from the outside of the tire 40, more specifically in a top view of the reference tangent plane P_REF perpendicular to the individual extraction direction D_extract, the grooves 12 of the first set of grooves provided in the first lobes 17 of sectors 54 and 55 form a herringbone pattern with the grooves 12 of the second set of grooves belonging to the second lobes 18 of the same sectors 54 and 55, particularly in the crown zone 51, as can be seen in Figures 2, 4, 7, 12, 14, and 19.

[0091] As can be seen in the reference tangent plane P_REF, the groove 12 becomes increasingly inclined with respect to the circumferential direction, i.e., increasingly curved inward in the circumferential direction, the further it moves azimuthal from the meridional plane P_MER containing the individual extraction direction D_extract, i.e., the further it moves azimuthal from the isomolecular meridional plane P_MER_BISECTOR of these sectors 54, 55.

[0092] In this regard, the first gauge plane PG1 and the second gauge plane PG2 of one and the same groove 12 are parallel to each other and both are perpendicular to the reference tangent plane P_REF, whereas, in contrast, the first and second gauge planes PG1 and PG2 of the first groove belong to the same sectors 54 and 55, more specifically to the same lobe 17 as the first groove, but are not parallel to the first and second gauge planes PG2 and PG3 of the adjacent second groove 12 which are offset in azimuth. That is, the first and second gauge planes PG1, PG2 of the second groove 12 are also perpendicular to the same reference tangent plane P_REF as the first and second gauge planes PG1, PG2 associated with the first groove 12, but the first and second gauge planes PG1, PG2 associated with the second groove 12 form a non-zero angle with respect to the first gauge plane PG1 and the second gauge plane PG2 of the first groove 12 in the reference tangent plane P_REF, as can be seen particularly in Figure 12. This is advantageously true for any pair of first and second grooves 12 arranged according to a radially pullable configuration and considered relative to each other within one and the same sectors 54, 55.

[0093] Preferably, within one and the same sector 54, 55, the angular repeat pitch denoted as K12, which defines two consecutive grooves 12 arranged according to a radially pullable configuration, separating two consecutive first fixing points M1 by an azimuth angle, is 0.75 to 3 degrees, preferably 1 to 2 degrees, and equal to 1.5 degrees as a preferred example.

[0094] In this way, many stays 5 can be obtained that are distributed across the angle range A54, A55 in question, and more generally, the stays 5 are distributed relatively evenly within the tire 40 while being close to each other, thereby providing the tire 40 with excellent cornering behavior.

[0095] Please note that the values ​​mentioned above, particularly the angular repeat pitch K12, apply to tires intended for mounting on rims with diameters of 17 to 24 inches, especially those for sports cars.

[0096] Preferably, and as is particularly evident in Figures 2, 3, 14, and 15, the core 10 includes two sector families 54, 55, namely, a first sector family 54 forming a sector called the "key" 54, which is designed to be accessible radially inward and to be initially removed along its individual extraction direction D_extract when the core 10 is dismantled, and a second sector family forming a sector called the "arch" 55, which is supported and locked in place by the key 54 and designed to be operable along its own individual radial extraction direction D_extract after being released by the removal of the key 54.

[0097] Preferably, all keys 54, especially the keys 54 of a single core 10, are identical to each other and therefore interchangeable.

[0098] Similarly, all arches 55, especially the arches 55 of the single core 10, are identical to one another and therefore interchangeable.

[0099] This will enable the standardization of the manufacturing and assembly of Core 10.

[0100] Preferably, the individual angular ranges A54, A55 covered by each sector 54, 55 are between 5 degrees and 90 degrees.

[0101] More specifically, the individual angle range A54 covered by each key 54 is 5 to 20 degrees, for example, 10 to 15 degrees, and the individual angle range A55 covered by each arch 55 is 50 to 90 degrees, for example, equal to 60 degrees.

[0102] By convention, the individual angular ranges A54 and A55 of sectors 54 and 55 are measured in the equatorial plane P_EQ around the outer perimeter of the receiving surface 10_out at its maximum radius, between two dividing lines indicating the starting positions of adjacent sectors 54 and 55. These individual angular ranges A54 and A55 correspond in the equatorial plane P_EQ to angles where their vertices lie on the central axis Z10 and intersect the arc drawn on the radial outer surface of sectors 54 and 55 in the equatorial plane P_EQ.

[0103] Preferably, the core 10 includes an even number of sectors 54, 55, for example, 6 to 20 sectors 54, 55, preferably 10 sectors 54, 55 as shown in Figures 2 and 3, forming an annular assembly that covers the entire 360 ​​degrees of azimuth around the central axis Z10.

[0104] Half of the even number of sectors, i.e., preferably five sectors 54 in this case, form sectors 54 called “keys” which are designed to be accessible radially inward and to be removed first along their own individual extraction direction D_extract during the dismantling of the annular assembly, and the remaining half of the number of sectors, i.e., preferably five sectors 55 in this case, form sectors 55 called “arches” which are supported and locked in place by the keys 54, alternating with the keys 54, and to be operated along their own individual radial extraction direction D_extract after being released by the removal of the keys 54.

[0105] Each of sectors 54 and 55 includes its own set of grooves 12, which are arranged according to a radially extractable configuration determined based on the individual extraction direction D_extract of this sector 54 and 55.

[0106] As described above, each sector 54, 55 preferably extends as a single block across the entire axial width of the cavity 4 for its individual angular range A54, A55, and for this purpose has a first lobe 17 and a second lobe 18, which are connected to each other by a bridge that passes through the equatorial plane P_EQ and forms the solid central strip 56 described above.

[0107] The total number of sectors 54, 55 constituting the core 10, in this case, for example, 20 sectors, more preferably 10 sectors as shown in Figures 2, 3, 14, and 15, is a compromise between, on the one hand, the simplicity of the core 10, the simplicity and compactness of the operating members that make the sectors 54, 55 movable, and the speed of the demolding operation that facilitates a reduction in the number of sectors 54, 55, and on the other hand, the technical feasibility of dividing lines between adjacent sectors 54, 55, in particular the feasibility of limiting surfaces of the key 54 manufactured on a plane parallel to the individual extraction direction D_extract of the key 54, and more generally the possibility of radially extracting sectors 54, 55 without interference with adjacent sectors, thereby facilitating the maintenance of the stage of decomposing the core 10 into azimuthal angles to make a sufficiently large number of sectors 54, 55.

[0108] In this regard, it should be noted that, advantageously, the dividing lines belonging to the key 54 are manufactured using the individual extraction direction D_extract of the key 54 as the generatrix, so the intersection of the dividing line and the curved receiving surface 10_out has a curved shape when projected onto a plane perpendicular to the central axis Z10, and has a herringbone appearance when viewed from the crown zone 51 side.

[0109] The sectors 54 and 55 are further preferably provided with fixed tails 57, which have, for example, T-shaped slots or dovetail slots, and an operating mechanism (not shown) can engage with these sectors 54 and 55 to support and move them.

[0110] This operating mechanism positions and supports sectors 54 and 55 within the annular assembly forming the core 10 during the assembly operation of the tire 40 and, where appropriate, during the hardening operation of the tire, and thereafter, during the demolding operation, it is possible to retract sectors 54 and 55 and withdraw them from the tire 40.

[0111] The operating mechanism may include a set of axial rods called "pikes," with one rod engaging with a fixed tail 57 for each sector 54, 55 so that the sectors 54, 55 can be carried and transported.

[0112] Each of these rods is, advantageously, movable both radially and axially relative to a gripping device, such as a gripping ring, designed to grip and hold the tire 40 from the outside, independently of the other rods.

[0113] In other words, these rods can first move axially so that each engages with the fixed tail 57 of sectors 54, 55 and locks together with sectors 54, 55.

[0114] Subsequently, sectors 54 and 55 can be removed one after the other, in which case the keys 54 can be removed sequentially first, followed by the arches 55.

[0115] To this end, each rod will first sequentially perform a centripetal radial movement along the individual extraction direction D_extract of the corresponding sector to extract sectors 54, 55 from the cavity of the tire 40, then perform an axial backward movement to remove sectors 54, 55 from the axial range covered by the tire 40, and then preferably perform a centrifugal radial movement to leave the necessary space to move the subsequent rod and thus extract the subsequent sectors 54, 55.

[0116] The core 10 is reshaped to manufacture a new tire 40 by performing the above-described movements in reverse order and reassembling sectors 54 and 55 into the annular core 10.

[0117] All of the above movements can be guided by appropriate guiding means, in particular guide rails for translational guidance, and these guiding means are driven by appropriate motors, preferably electric motors.

[0118] A suitable control unit, such as an electronic control unit, enables the control, adjustment, and automation of its movement, particularly by controlling the centripetal radial retraction of the keys 54 one by one or simultaneously in a first stage during the demolding phase, and then initiating and controlling the centripetal radial retraction of the arch 55 in a second stage.

[0119] Furthermore, by a preferred feature that can constitute the invention in itself, at least one of the grooves 12, more specifically, at least one of the grooves 12 arranged in a radially pullable configuration, preferably each groove 12 in sectors 54, 55 of the sectors in question, includes a compensator 20, which compensator 20 has a stop 21 that forms a point in the groove 12 called an "intermediate passing point" M3, which is located away from the baseline D0, so that the first fixing point M1 is moved through the intermediate passing point M3 defined by the stop 21 to the second fixing point The length L5_tot of the path that the stay 5 follows within the groove 12 to the attachment point M2 is strictly greater than a distance called the "base distance L0" that separates the second attachment point M2 and the first attachment point M1 in a straight line, thereby allowing the compensator 20 to form a stay length reserve that can be mobilized to move the sidewalls 44, 45 or beads 42, 43 containing the second attachment point M2 away from the crown 41 containing the first attachment point M1 when the sectors 54, 55 are pulled out of the cavity 4 along the individual extraction direction D_extract.

[0120] Specifically, as described above, the first bead 42 and the second bead 43 preferably form a constriction relative to the widest part in the axial direction of the cavity 4 in a cross-section in a radial plane containing the central axis Z10, so that the first side wall 44 and the second side wall 45 are perpendicular to the central axis Z10 with respect to the individual extraction direction D_extract of the sector 54 and form a surface having an undercut with respect to the individual extraction direction D_extract contained in the isomolecular meridional plane P_MER_BISECTOR of the sectors 54 and 55.

[0121] In this case, the demolding operation requires moving the first bead 42 and the second bead 43 axially away from each other so that sectors 54 and 55, which are to be pulled out of the cavity 4 of the tire 40, can pass through.

[0122] In this regard, the separation of beads 42 and 43 can be caused simply by forcing elastic deformation on the first and second sidewalls 44 and 45 of the tire under the pressing effect of the first and second lobes 17 and 18 of sectors 54 and 55, which are performing a centripetal radial extraction movement along the individual extraction direction D_extract relative to the tire. In this case, the first and second sidewalls 44 and 45 and / or the first and second beads 42 and 43 can slide over the lobes 17 and 18 while maintaining contact with the receiving surface 10_out, at least at the start of the extraction movement, as shown in Figure 17.

[0123] Optionally, in order to form a passage of appropriate width in front of the sectors 54, 55 in question, it is also conceivable to apply opposing tensile forces to the first and second beads 42, 43, thereby actively pulling the first bead 42 away from the first lateral zone 52 of the receiving surface 10_out and simultaneously pulling the second bead 43 away from the second lateral zone 53 of the receiving surface 10_out. For this purpose, for example, it is possible to force the beads to move apart using a suitable traction tool that is away from the sectors 54, 55 in question and engages with the beads 42, 43.

[0124] Similarly, note that another effect of locally moving the beads 42, 43 away from the position they initially cover on the core's receiving surface 10_out in the angular range A54, A55 corresponding to sectors 54, 55 that are to be withdrawn from the cavity of the tire 40, so that each of the first and second beads 42, 43 is materially continuous around the central axis Z10, is that these same beads 42, 43 move away from the receiving surface 10_out in adjacent sectors 54, 55, as shown in Figure 20.

[0125] Naturally, the separation of the beads 42 and 43, regardless of the method that causes the separation or which sectors 54 and 55 are affected by the separation, must not cause damage to the tire 40 or the stay 5. In particular, the separation of the beads 42 and 43 must not weaken the stay 5, cause it to break under tension, or cause it to tear and separate from their fastening points M1 and M2.

[0126] However, advantageously, the compensator 20 can, when appropriate, restore all or part of the stay length retention it has formed in the groove 12, so that the entire stay 5 can adapt without damage to variations, more specifically, increases, in the distance separating the first and second fastening points M1 and M2, which are caused by the movement of the beads 42 and 43.

[0127] This compensation, more specifically, the deployment of stay 5, advantageously occurs not only in sectors 54, 55 while the crown zones 51 of sectors 54, 55 undergo demolding movement along the individual extraction direction D_extract as shown in Figure 17, but can also occur in sectors 55, 54 directly adjacent to the sector undergoing demolding movement, on the other hand, the adjacent sectors 55, 54 remain in place within the tire cavity 4, and each crown zone 51 of the adjacent sectors 54, 55 remains in contact with the inner surface 3_in of the tire crown 41, but the beads 42, 43 of the adjacent sectors 55, 54 move away from the lateral zones 52, 53 of the receiving surface 10_out, as shown in Figure 20, and thus detach.

[0128] The retained stay length Delta_L is equal to the difference between the length L5_tot of the initial path that stay 5 follows within groove 12 from the first fixing point M1 to the second fixing point M2, passing through the intermediate passing point M3 defined by stop 21, and the base distance L0: Delta_L=L5_tot-L0

[0129] Preferably, after the stay 5 is laid in the groove 12, a slight longitudinal tensile force is applied to the stay 5, but a triangular configuration exists. In this configuration, as can be seen in Figure 16, the stay 5 is stretched to form a straight section first from the first fixing point M1 to the intermediate passing point M3, and then from the intermediate passing point M3 to the second fixing point M2. In this way, the compensator 20 makes it possible to geometrically form triangles M1M2M3, and the first fixing point M1 and the second fixing point M2 of this triangle form the first and second vertices that define the base [M1M2] of the triangle, respectively, and the intermediate passing point M3, defined by the stop, forms the third vertex.

[0130] In that case, the maximum available stay length reserve Delta_L is, in absolute terms, the difference between the total length of the two stay sections forming the shorter sides [M1M3] and [M3M2] of the triangle and the initial length of the base [M1M2] of the triangle, and when the first and second wall portions 3_1, 3_2 fit into the receiving surface 10_out of the core 10, the initial length of the base [M1M2] is the base distance L0 determined by the shape and dimensions of the core 10, which is thought to separate the first fixing point M1 located in the first wall portion 3_1, in this case the crown 41, from the second fixing point M2 located in the second wall portion 3_2, in this case one of the first and second side walls 44, 45 or one of the first and second beads 42, 43.

[0131] Preferably, this stay length retained Delta_L is 3% to 30%, more preferably 8% to 20%, and more preferably 10% to 15% of the base distance L0.

[0132] Preferably, instead of or in addition to the relative ratio described above, the stay length retention Delta_L can be between a minimum of 3 mm and a maximum of 30 mm in absolute value, for example, between a minimum of 10 mm and a maximum of 18 mm, preferably between 12 mm and 15 mm.

[0133] These dimensions of length retention Delta_L, more specifically the low (minimum) value selected as length retention Delta_L, are advantageous in that they allow sufficient excess length of the stay 5 to be stored in the groove 12 after the construction phase and before the possible curing and demolding phases, i.e., sufficient initial excess length for the stay 5 to continue without damage and undergo the following: -During the curing stage, while the first and second fixing points M1 and M2 are kept at a certain distance from each other by the core 10, in this case the base distance L0, there is a unique shortening of the stay 5 that may occur due to thermal shrinkage, and in particular, - The effective distance separating the first and second fixing points M1 and M2 is extended, which occurs when at least one of the first and second wall portions 3_1 and 3_2 detaches from the core 10 receiving surface 10_out during the demolding stage, in particular when the first bead 42 and the second bead 43 are pulled away from the first transverse zone 52 and the second transverse zone 53 of the core 10, respectively, causing the first and second wall portions 3_1 and 3_2 to be forced to separate, causing the first and second lobes 17 and 18 of this sector to advance in a centripetal radial translation along the individual extraction direction D_extract of this sector 54 and 55.

[0134] This same dimensional determination of length retain Delta_L, more specifically, the high value (maximum value) selected as length retain Delta_L, is advantageous because it limits the initial excess length of the stay 5, so after the demolding operation and when the tire 40 is placed in its functional configuration, in this case when the tire 40 is mounted on a mounting support such as a rim, and when the tire 40 expands by introducing pressurized fluid into the cavity 4, the wall 3, specifically the first wall portion 3_1 and the second wall portion 3_2, The configuration is such that the initial excess length of the stay is absorbed, that is, the stay 5 extends linearly, that is, substantially in a tensioning manner, through the cavity 4 from the first fixing point M1 to the second fixing point M2, that is, it performs its retention function against the relative separation movement of the first and second fixing points M1 and M2, and thus can hold the second wall portion 3_2, in this case the side walls 44, 45 or beads 42, 43, against the first wall portion, in this case the crown 41, and vice versa.

[0135] Particularly preferred is the stop 21, which is adaptable in that it allows for positional variation of the intermediate passing point M3 in the groove 12 in response to variations in the strength of the dominant longitudinal tension within the stay 5 between the first fixing point M1 and the second fixing point M2.

[0136] This adaptability is achieved, in particular, by imparting elastic behavior to Stop 21.

[0137] In one possible implementation, this elastic behavior allows the stop 21 to function with a threshold effect, thereby either holding the stay 5 at the intermediate passing point M3 against its movement in response to the stress applied to the stay 5, or conversely, elastically bending under the influence of a stress exceeding a predetermined threshold, thereby releasing or allowing the stay 5 to pass through and changing its position in response to the stress.

[0138] That is, for example, a stop 21 in the form of a curved leaf spring can be provided, and this stop 21 will have a base fixed to a first transverse wall 15 that defines the boundary of the groove 12, and an arch supported on this base that forms a dome shape in the direction of a second transverse wall 16 that defines the boundary of the groove 12. The arch, which is elastically deformable and forms a constriction narrower than the transverse dimension between the second transverse wall 16 and the stay 5 when stationary, prevents the stay 5 from sinking into the groove 12 at the intermediate passing point M3, and further holds the stay 5 at the intermediate passing point M3 by elastic clamping between the arch and the second transverse wall 16, and allows the stay 5 to be released and / or allowed to pass through the constriction, sink further deeper into the groove 12, or be pulled out of the groove 12 when a sufficiently strong tensile force is applied to the stay 5.

[0139] However, in another preferred possible implementation, as can be seen in Figures 16, 17, and 18, a stop 21, preferably formed by a ball 23, is movably mounted in the groove 12 and supported by an elastic member 22, preferably a helical spring 27, so that the stop 21 can ensure elastic suspension of the stay 5 received in the groove 12.

[0140] Advantageously, the elastic member 22 can elastically deform at the intermediate passing point M3 against the force resulting from the tensile force applied to the stay 5 at the first and second fixing points M1 and M2, that is, the stop 21 and therefore the intermediate passing point M3 can move within the groove 12, and as a result, the stay 5 can be deployed as much as necessary to always conform to the separation distance separating the first fixing point M1 and the second fixing point M2.

[0141] In particular, stop 21, in this case ball 23, can sink in by compressing spring 27 against elastic member 22, as shown in Figure 17, thereby lowering the height of triangle M1M2M3 and thus increasing the length of base [M1M2].

[0142] Furthermore, such an elastic suspension is advantageous in that it is possible to keep the stay 5 under tension on the one hand between the first fixing point M1 and the intermediate passing point M3, and on the other hand between the intermediate passing point M3 and the second fixing point M2, and thus keep the stay 5 in a straight line section by section with respect to each of the two sides [M1M3] and [M3M2] of the triangle.

[0143] This advantageously allows the stay 5 to remain in the groove 12 during the construction phase, which includes laying the stay 5 and then the components of the tire 40 wall 3, as well as during at least part of the demolding operation. By ensuring that the stay 5 does not become loose or disoriented within the groove 12, the risk of the stay 5 getting caught or entangled is advantageously avoided, particularly during the demolding phase.

[0144] Preferably, as can be seen in Figures 15-17, the compensator 20 includes a cartridge 30 that is detachably inserted into the core 10, more specifically into sectors 54 and 55, along a direction that transverses the lateral walls 15 and 16 that define the boundaries of the groove 12.

[0145] The cartridge 30 includes a plurality of chambers 24, each chamber 24 housing a stop 21, in this case a ball 23, which is captured within the chamber 24, slidably mounted within the chamber 24, and moved by an elastic member 22, in this case a helical spring 27. Each chamber 24 is provided with a slot 25, which is positioned to align with a corresponding groove 12 so that the stay 5 in question can reach the stop 21 located within the chamber 24.

[0146] Within each chamber 24, as shown in Figure 17, the elastic member 22 pushes the stop 21 in the direction of the slot 25 against the stay 5, and if the force exerted by the stay 5 is insufficient, the elastic member 22 presses the stop 21 against the bottom of the chamber 24, as can be seen in Figure 18.

[0147] The direction of movement D21 of stop 21, more specifically the direction of translational movement of the moving body forming ball 23, is determined by chamber 24, but is preferably parallel to gauge planes PG1, PG2, i.e., in this case parallel to the side walls 15, 16 of groove 12, and also perpendicular or substantially perpendicular (e.g., ±5 degrees) to the bottom 13 of groove 12, i.e., in this case preferably substantially perpendicular to baseline D0.

[0148] The present invention naturally relates to a method for manufacturing a tire 40 in which the tool 1 according to the present invention is used.

[0149] In this method, to form the crown 41, first and second side walls 44, 45, and first and second beads 42, 43 of the tire, stays 5 are placed in each groove 12 of the desired core 10, then at least one elastomer component is laid on the receiving surface 10_out, and then the tire 40 is demolded by moving the constituent sectors 54, 55 of the core through centripetal radial movement carried out by the individual extraction direction D_extract specific to each sector 54, 55, in order to pull each sector 54, 55 out of the cavity 4 of the tire 40, while leaving the stays 5 in place in the cavity 4 of the tire 40.

[0150] More specifically, the core 10 is first assembled by positioning sectors 54 and 55 appropriately, with the arches 55 first and the key 54 then fitted between the two arches 55 through centrifugal radial deployment movements so that an annular core 10 is obtained.

[0151] Therefore, this construction stage preferably includes a first preparation phase during which annular fixing structures based on uncured rubber, such as strips of uncured rubber forming an adhesive strip, are laid one each in the first and second transverse zones 52, 53 on the receiving surface 10_out, immediately adjacent to the second opening portion 14B of the groove 12, and at least one third annular fixing structure is laid immediately adjacent to the first opening portion 14A of the groove 12 on the crown zone, here in the case of a solid central strip 56 passing through the equatorial plane P_EQ.

[0152] In the phase of laying the stay 5, a portion of the stay 5 is pressed against the annular fixing structure so that it adheres to the fixing structure by typically embedding it into a strip of uncured rubber, so that these fixing structures hold the stay 5 in place during the operation of laying the stay 5 and subsequently during the operation of positioning the remaining components of the wall 3 of the tire 40. Advantageously, these annular fixing structures permanently incorporate the tire 40 thus manufactured.

[0153] The construction phase continues with the laying of stay 5, which can be carried out in a manner very similar to that described in International Publication No. 2022 / 200718, mentioned in the preface.

[0154] Preferably, a single continuous reinforcing thread 70 is used to form multiple stays 5, preferably all of the stays 5, by arranging the continuous reinforcing thread 70 in a meandering shape through a continuous groove 12, as shown in Figures 13 and 16.

[0155] To this end, the thread 70 is pressed against the first fixing structure located in the first lateral zone 52 to form a lateral fixing point M2, and then the thread 70 is inserted into the first groove 12 below the receiving surface 10_out while applying slight longitudinal tension to the thread 70, so that the thread 70 passes inside the first lobe 17 and exits the groove 12 in the crown zone 51, where the thread 70 is pressed against the crown fixing structure located in the crown zone 51 of the receiving surface 10_out to form a crown fixing point M1. As a result, a first stay 5 is generated and is received in the first groove 12.

[0156] After passing through the equatorial plane P_EQ, this thread then enters the second groove 12, which is located on the axial extension of the first groove 12, and so this thread 70 passes through the interior of the second lobe 18 and exits the second groove 12 in the second transverse zone 53, where this thread 70 is pressed against the second fixing structure in order to form a transverse fixing point M2 and receive the second stay 5 into the second groove 12.

[0157] As can be seen in Figure 13, these continuous reinforcing threads 70 are arranged to move back and forth as a single unit, passing through the crown zone 51 each time, from the lateral zones 52 and 53 of the core 10 to the other lateral zones 53 and 52, forming an alternation.

[0158] In each lateral zone 52, 53, the thread 70 is folded back to form a loop 71, which is then pressed into the corresponding fastening structure before the thread 70 re-enters the groove 12.

[0159] Of course, if a stop 21 is provided in the groove 12, the thread 70 will carry the stop 21, forming a fold at the intermediate passing point M3, and thus forming a length retention of the stay 5 within the groove 12 in question between the first and second side walls 15 and 16.

[0160] This construction phase then includes a packing phase, during which the components of the tire 40, namely the crown 41, side walls 44, 45, and beads 42, 43, are placed on the receiving surface 10_out in order to construct the wall 3 of the tire 40.

[0161] These components preferably include rubber-based strips or pies and are reinforced, where appropriate, with longitudinal reinforcing threads of fabric, polymer, or metal. Other reinforcing components, such as composite strips based on fiberglass and resin, may be provided.

[0162] Preferably, all or some of these components can be wrapped around and laid on the core 10, which can be configured to rotate around its central axis Z10 for this purpose.

[0163] This method then includes a curing step after the construction step.

[0164] During this curing stage, the core 10 and the tire 40 supported on the core 10 are placed in a curing mold, and the rubber components of the tire 40 are vulcanized. For this purpose, it is preferable that the temperature of the mold, and more specifically the temperature of the tire, be between 120°C and 200°C.

[0165] In the packing and curing phases described above, it is assumed that all or part of the crown 41, sidewalls 44, 45 and / or beads 42, 43 of the tire 40 are generated by injection molding a thermoplastic elastomer material after backing the core 10 with the stay 5 supported, using an appropriate injection mold.

[0166] In other words, the curing step is replaced by a cooling step that brings the thermoplastic elastomer material to a solid and elastic state.

[0167] Of course, a mixing method combining a packing phase in which solid rubber elements are laid on the core 10 and a phase in which thermoplastic elastomer material is injection molded is also conceivable. In that case, the curing step can be performed before, simultaneously with, or after the phase in which the thermoplastic elastomer material is injection molded.

[0168] In all cases, after the tire 40 has been produced, the method then includes a demolding step, during which the core 10 is removed from the tire 40, leaving the stay 5 in place within the cavity 4 of the tire 40, in particular as shown in the steps of Figures 16, 17, and 18.

[0169] For this purpose, first, at least one key 54 is removed, preferably using the operating mechanism described above, automatically through centripetal radial movement perpendicular to the central axis Z10, in accordance with the individual extraction direction D_extract of that key 54, as shown in Figures 14 and 15.

[0170] In this process, the stay 5, which is initially trapped in the groove 12 of the key 54 and held at its respective fixing points M1 and M2 by the tire 40, slides freely along the groove 12 without encountering any obstacles, from the radially inner position of the key 54 located in the retaining volume 11 to the radially outer position of the key 54 located away from the retaining volume 11, along a trajectory from the bottom 13 of the groove 12 toward the mouth 14, with each extension direction D_extract being carried between the first and second side walls 15 and 16.

[0171] During this pulling movement, if the first and second lobes 17, 18 of the key 54 are forced by the elastic deflection of the side walls 44, 45 to separate the side walls 44, 45 and the beads 42, 43 in the axial direction, the compensator 20 releases all or part of the excess length of the stay 5 stored in the groove 12, so that each stay 5 can follow the temporary increase in the distance separating the two fastening points M1, M2 without damage, as shown in Figure 17.

[0172] The key 54 continues to move radially toward the central axis Z10 along the individual extraction direction D until it is completely removed from the cavity 4, more specifically, until the crown zone 51 of the receiving surface 10_out is positioned at a radial distance from the central axis Z10 that is strictly smaller than the radius of the radial internal limit of the beads 42, 43, as shown in Figure 18.

[0173] The same process can then be performed on the other key 54 to completely release the hardened tire 40 to which the stay 5 is attached, and then on the arch 55, modifying it and applying the above description.

[0174] Naturally, the present invention is by no means limited to the modifications described above, and those skilled in the art will find that, in particular, the above features can be separated or freely combined, or substituted with equivalent features. [Explanation of symbols]

[0175] 1 Tool 10 cores 12 grooves 52 First horizontal zone M1 First fixing point P_EQ Equatorial plane

Claims

1. The tire (40) includes a core (10) that forms a volume called a “retaining volume” (11) corresponding to the cavity (4) of the tire, the core (10) having a radial outer crown zone (51) centered on the central axis (Z10) and intended to receive components of the crown (41) of the tire (40), and first lateral zones (52) on both axial sides of the crown zone (51) that are curved inward toward the central axis (Z10) and intended to receive components of the first side wall (44) and first bead (42) of the tire (40), and the central axis The core (10) is also bounded on the outside by a convex toroidal surface called a “receiving surface” (10_out) which includes a second lateral zone (53) that is curved inward toward the line (Z10) and intended to receive components of the second side wall (45) and second bead (43) of the tire, and the core (10) also includes a plurality of grooves (12) that are distributed at azimuthal angles around the central axis (Z10) and embedded in the retaining volume (11) from the receiving surface (10_out), so that each of the grooves (12) is along the profile of the receiving surface (10_out) The groove (12) has a mouth portion (14) that extends continuously from a first mouth portion (14A) located in the crown zone (51) to a second mouth portion (14B) located in one of the first and second lateral zones (52, 53), and each of the grooves (12) forms a housing whose boundary is defined in the azimuthal angle around the central axis (Z10) by a first lateral wall (15) and a second lateral wall (16) that intersect the receiving surface (10_out) at a distance from each other in the azimuthal angle, and each groove (12) passes through the first mouth portion (14A) to the groove A thread-like reinforcing element (5) called a "stay" (5) can be received inside the housing between the first side wall (15) and the second side wall (16), entering (12) and exiting the groove (12) through the second mouth-shaped portion (14B), and the "stay" (5) can be received inside the housing between the first side wall (15) and the second side wall (16), so as to permanently incorporate the structure of the tire (40) and extending through the cavity (4) of the tire (40) to a first fixing point (M1) called a "crown fixing point" (M1) located on the crown (41) of the tire (40) to the first and second side walls (44,A tool (1) for manufacturing a toroidal tire (40), which is designed to connect to a second fastening point (M2) called a “lateral fastening point” located in one of the 45) or one of the first and second beads (42, 43), The core (10) is subdivided by azimuth angles around the central axis (Z10) into a series of sectors (54, 55), each covering a predetermined azimuth angle range (A54, A55) called “individual angular ranges” (A54, A55) around the central axis (Z10), and at least one of the sectors (54, 55), preferably each of the sectors (54, 55), is positioned in the individual angular range (A54, A55) occupied by the sector (54, 55) and is moved relative to adjacent sectors (54, 55) so as to be removed from the tire (40) along a direction called “individual extraction direction” (D_extract) which is perpendicular to the central axis (Z10). Multiple grooves (12) located in the same sector (54, 55), preferably all of the grooves (12), are projected onto a plane called the “reference tangent plane” (P_REF), which is perpendicular to the individual extraction direction (D_extract) of the sector (54, 55) in question and tangent to the radial outermost part of the crown zone (51) of the receiving surface (10_out) of the sector (54, 55) in question, such that the first lateral wall (15) of each of the multiple grooves (12) passes through a virtual straight line called the “baseline” (D0) that passes through the first fixing point (M1) and the second fixing point (M2) of the stay (5) received in the groove (12) in question. The first side of the baseline (D0) is located at a distance from it, while the second side wall (16) is located on the second side of the baseline (D0) opposite to the first side, and at a distance from the baseline (D0), so that the first and second side walls (15, 16) do not interfere with the volume swept by the stay (5) when the stay (5) is aligned with the baseline (D0) in orthographic projection on the reference tangent plane (P_REF), and so that the relative movement carried out by the individual extraction directions (D_extract) of the sectors (54, 55) is generated between the stay (5) and the sectors, so that the first and second side walls (15, 16) are arranged in a configuration called a "radially extractable configuration". A tool characterized by (1).

2. The tool according to claim 1, characterized in that the individual extraction directions (D_extract) are contained within the meridional planes that form the bisecting plane (P_MER_BISECTOR) of the sector (54, 55) in question.

3. The sectors in question (54, 55) have a first convex lobe (17) on one side extending from the crown zone (51) to the first transverse zone (52) and including a first set of grooves (12), and a second convex lobe (18) on the other side extending from the crown zone (51) to the second transverse zone (53) and including a second set of grooves (12), The first lobe (17) and the second lobe (18) are fixed to each other and preferably formed as one piece with each other, so as to form a subassembly that is movable as a whole along the individual extraction direction (D_extract) of the sector (54, 55) in question. The grooves (12) of the first set and the grooves (12) of the second set are arranged according to the same radially pullable configuration determined based on the individual pull-out direction (D_extract), The tool according to feature 1 or 2.

4. Each groove (12) arranged according to the radially extractable configuration extends from a first virtual gauge plane (PG1) located at a distance from the baseline (D0) on one side of the baseline (D0) to a second virtual gauge plane (PG2) which is also parallel to the individual extraction direction (D_extract) and the baseline (D0), and is tangent to the first side wall (15). The second gauge plane (PG2) extends parallel to the first gauge plane (PG1), leaving a clear free space called a “useful passage” (19) throughout the entire portion of the retaining volume (11) extending from the position provided for the stay (5) inside the groove (12) to the opening (14) of the groove (12), and the second gauge plane (PG2) is positioned at a distance from the baseline (D0) on the other side of the baseline (D0) so as to be tangent to the second side wall (16), The distance (W19) called the "useful passage width" (W19) that separates the second gauge plane (PG2) from the first gauge plane (PG1) is between 0.3 mm and 3 mm, preferably between 0.8 mm and 2.2 mm, for example between 1 mm and 1.8 mm, or more specifically between 1.1 mm and 1.3 mm. The tool according to any one of claims 1 to 3.

5. The tool according to any one of claims 1 to 4, characterized in that the first transverse wall (15) and the second transverse wall (16) of each of the at least one groove (12) arranged according to the radially pullable configuration, and preferably the first transverse wall (15) and the second transverse wall (16) of the groove (12) arranged according to the radially pullable configuration, are planar and extend parallel to each other and parallel to the individual pull-out directions (D_extract).

6. The tool according to any one of claims 1 to 5, wherein, for a plurality of grooves (12) arranged according to the radially pullable configuration, preferably for each of them, the first fixing point (M1) and the second fixing point (M2) of one and the same groove (12) are located at one and the same azimuth position around the central axis (Z10).

7. The tool according to any one of claims 1 to 6, characterized in that the angular repeating pitch (K12) that defines two consecutive grooves (12) arranged according to the radially pullable configuration within one and the same sector (54, 55) by separating two consecutive first fixing points (M1) at an azimuthal angle is between 0.75 degrees and 3 degrees, preferably between 1 degree and 2 degrees, and is equal to 1.5 degrees as a preferred example.

8. The tool according to any one of claims 1 to 7, characterized in that the individual angular ranges (A54, A55) covered by each sector (54, 55) are between 5 degrees and 90 degrees.

9. The core (10) comprises an even number of sectors (54, 55), preferably 10 sectors (54, 55), to form an annular assembly that covers the entire 360 ​​degrees in azimuthal angles around the central axis (Z10), with half of the even number of sectors, preferably 5 sectors (54), forming sectors (54) called “keys” that are designed to be accessible radially inward and that each one is initially removed along its own individual radial extraction direction (D_extract) during the dismantling of the annular assembly, and the other half, preferably 5 sectors (55), supported by the keys (54). The tool according to any one of claims 1 to 8, wherein sectors (55) called "arches" are arranged alternately with the key (54), each designed to be locked in place and operable along its own individual radial extraction direction (D_extract), and after the "arches" (55) are released by the removal of the key (54), each of the sectors (54, 55) includes its own set of grooves (12) arranged according to the radially extractable configuration determined based on the individual extraction direction (D_extract) of the sector (54, 55) in question.

10. At least one of the grooves (12) includes a compensator (20) having a stop (21) that generates a point in the groove (12) called an "intermediate passing point" (M3) located away from the baseline (D0) and intended to cooperate with the stay (5), and so the length (L5_tot) of the path traced by the stay (5) in the groove (12) from the first fixing point (M1) to the second fixing point (M2) through the intermediate passing point (M3) defined by the stop (21) is such that the second fixing point (M2) is directly from the first fixing point (M1). The tool according to any one of claims 1 to 9, characterized in that the compensator (20) is formed to be strictly larger than a distance called the “base distance (L0)” that separates the lines, thereby enabling the sidewall (44, 45) or the bead (42, 43) containing the second fixation point (M2) to be mobilized to move away from the crown (41) containing the first fixation point (M1) when the sector (54, 55) in question is pulled out of the cavity (4) along the individual extraction direction (D_extract).

11. The tool according to 10, wherein the stop (21), preferably formed by a ball (23), is movably mounted in the groove (12) and is supported by an elastic member (22), preferably a helical spring (27), so as to ensure elastic suspension of the stay (5) received in the groove (12).

12. A method for manufacturing a tire (40) in which a tool (1) according to any one of claims 1 to 11 is used during execution, The stays (5) are positioned in each groove (12) of the desired core (10), then at least one elastomer component is placed on the receiving surface (10_out) to form the crown (41), first and second sidewalls (44, 45), and first and second beads (42, 43) of the tire, and then the tire (40) is demolded by moving each constituent sector (54, 55) of the core one by one using a centripetal radial movement carried out by the individual extraction direction (D_extract) specific to the sector (54, 55) in question, in order to extract each sector (54, 55) from the cavity (4) of the tire (40), leaving the stays (5) in place within the cavity (4) of the tire (40). method.

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