Abstract: Rubber areas of a tire having electrical conductivity are used to transmit ignals to an integrated circuit embedded within the thickness of the tire without relying on an inductive or capacitive coupling. Rather, an electric signal from an identification device is conducted to the integrated circuit through a first electrically conductive area of rubber such as a bead cover and/or the tire tread, and a responsive signal is returned to the identification device through a second electrically conductive area.

Abstract: A metal wire having the following features:(a) it is formed, at least in part, by a steel having a carbon content of at least 0.1% and at most 0.6% and a boron content of less than 8 ppm;(b) the steel of the wire has a strain-hardened lower bainite type structure (7);(c) the diameter of the wire varies from 0.10 to 0.40 mm;(d) the resistance to rupture of the wire is at least equal to 2800 MPa;(e) the elongation upon rupture of the wire is at least equal to 0.4%.The method according to the invention for producing this wire consists in strain hardening a machine wire having 28% to 90% proeutectoid ferrite and 72% to 10% perlite, thereupon carrying out a heat treatment to obtain a structure of lower bainite type, then effecting a strain hardening on the wire, the temperature of the wire upon the strain hardening being less than 0.3 T.sub.F, T.sub.F being the melting point of the steel expressed in Kelvin.

Abstract: In order to remedy the drawbacks consisting of separations at the end of upturns (50) of the carcass reinforcement (1) of a tire having frustoconical seats as well as the rapid wear of the bead protectors, said tire is provided with beads (B) each of which has an auxiliary bead ring (4) located in the part intended to cover the tire flange (13), a reinforcement ply (5) being wound around the bead ring (4) in order to form two layers (51) and (52) which extend to the tip (6) of the bead (B).

Abstract: In order to optimize the behavior of a conventional passenger car on snow-covered and icy ground, the driving axle of said vehicle is equipped with tires the treads (1) of which are provided with elements in relief (11) having incisions (14) of a width other than zero, the traces of which are transverse while the load-bearing axle of the same vehicle is equipped with tires of the same structure but with treads (2, 3) provided with elements in relief or blocks (21, 31) having incisions (24, 34) of a width other than zero, the traces of which are elliptical.

Abstract: An integral rim (J') having frustoconical seats (2') inclined 15.degree..+-.1.degree., the axial widths (P') of which are greatly decreased as compared with the axial widths (P) of the known frustoconical seats (2), and having a mounting groove (3') of reduced height (H') so as to permit an increase in the space available for the braking means. The assembly of a rim (J') as described above and of a tire (T) having beads the tips of which have been truncated permits better resistance of said beads to fatigue while permitting easy mounting. The invention is employed for tires and rims intended for heavy vehicles.

Abstract: The identification of pneumatic tires by electromagnetic coupling with a nsponder embedded in the thickness of the pneumatic tire is made possible by a suitable interrogation antenna so that, regardless of the position of the transponder in the pneumatic tire, a position which is unknown, the coupling is always of the same quality. Such an antenna may take the form of a figure eight or of a closed torus.

Abstract: In order to improve the compromise between the properties of adherence to ow-covered or icy ground and its wear properties, the tread of a tire which is provided with incisions having a width other than zero and, seen in cross section, fork-shaped traces with two branches, has grooves the walls of which are provided with an incision which forms with the trace of the groove a trace which is symmetrical to the trace of the incision which is parallel to and closest to said groove.

Abstract: Tread for heavy vehicles with radial carcass comprising a plurality of cimferential rows of blocks (13) having incisions (15), defined by circumferential (10) and transverse (12) grooves, said blocks being connected to each other in circumferential direction by platforms 14) which are arranged in the transverse grooves (12) and the height of which increases from the center towards the edges of the tread, the depth of the incisions (15) decreasing from the center towards the edge of the tread and the density of the incisions being maximum in the central zone (Z) of the tread.

Abstract: The removal of the tread consists in grasping a zero-degree reinforcement rd, which the crown of the tire must necessarily contain in order to apply this method, and pulling transversely on it until it is completely removed from the tire. In this way, the tread is very easily separated from the carcass of the tire.

Abstract: A motorcycle tire includes a belt consisting successively, starting from ing ply 22 to tread 11, of a crown ply 12 at 0.degree., then a crown ply 13 at 45.degree., and a crown ply 14 at -45.degree..

Abstract: In order to improve the resistance to dislodging of the beads of a tire ur severe conditions of travel, the combination in accordance with the invention is formed of said tire and a rim (1) the seat of which, placed on the outside of the vehicle, has a circumferential protrusion (2). The base (3) of the bead (B) intended to rest against said seat has a width (L.sub.1) which is at least equal to the axial distance (L) separating the rim flange (11) from the summit (A) of the protrusion (2), a meridian profile adapted to that of the seat, while the rubber bead filler has a modulus of elasticity in extension at least equal to 4 MPa, measured under an elongation of 10%.

Abstract: Tread for heavy-vehicle tires with radial carcass having at least one cirferential groove (1) in the form of a broken line and wide transverse grooves (2) in the form of a broken line defining blocks, the wide transverse grooves (2) having walls of constant and symmetrical inclination over a median zone (6) extending on both sides of the median plane over a width of between 40% and 75% of the width of the tread and having, beyond said median zone and up to the edges, walls of variable and asymmetrical inclination as well as two circumferential narrow side grooves (5) located at a distance from the edges not exceeding 1/3 of the width of the tread and having a depth of between 10% and 70% of the depth of the transverse grooves.

Abstract: A method and installation (1) for the on-line production of a ply (21) of semblies (20) of threads (30, 40) and the winding thereof on a beam (29). A plurality of rotary devices (2) permitting the production of the assemblies (20) is used to obtain the ply (21); the ply (21) is driven along by pulling elements (23) common to all the assemblies (20); elements (32) which permit the synchronizing of the speeds of the devices (2) and of the elements (23) are used; the ply (21) is wound on the beam (29); elements (33) which permit the detection of a defect (35) in the ply (21) are used. Beams (29) obtained by this method or with this installation.

Abstract: A tire mold including a pair of shells (2) for molding the side walls of tire and a ring or sectors (1) for molding the tread of the tire and in which each sector (1) of the mold includes an outer support (10) and an inner mold fitting (11). The contact of the sectors with each other and of the sectors on each side wall molding shell (2) takes place via segments (3) of small cross section, compressed elastically upon the closing of the mold, so as to assure complete tightness of the mold.

Abstract: An assembly (100) for the reinforcing of an article of plastic and/or rubber, characterized by the following features:(a) it comprises two adjacent concentric layers (1, 2) of filaments (10, 20), the filaments (10, 20) having their axes (O.sub.1, O.sub.2) arranged, within each of the layers, substantially on a circle (C.sub.1, C.sub.2) of radius R.sub.1, R.sub.2 ; in each layer (1, 2) the filaments (10, 20) are wound in the same direction and have the same pitch (P.sub.1, P.sub.2);(b) the layers (1, 2) have the same direction of winding;(c) R.sub.1, R.sub.2, P.sub.1, P.sub.2 are in accord with the relationship:P.sub.1 >P.sub.2 >P.sub.1 .times.[1-2(R.sub.2 -R.sub.1)/R.sub.2 ].Articles reinforced by such assemblies, for instance pneumatic tires.

Abstract: Process and device (1) for the heat treatment of at least one metal wire using capstans (2, 3) characterized by the following features: (a) the wire (4) is brought around at least two capstans (2, 3) which conduct the heat and which include recesses (11). The wire (4) is reeved and crossed in said recesses (11), the width of the recesses (11) being slightly greater than that of the wire (4); (b) the capstans (2, 3) are heated or cooled by means of at least one gas (27), which passes between the capstans and a part which is in contact with a heat exchanging fluid; (c) the thickness of the gas layer is chosen according to the heat treatment to be applied. Installations for the heat treatment of metal wires (4) include at least one device (1), metal wires (4) treated by the process and/or the device (1), and/or the installations according to the invention, as well as items reinforced by said wires (4), in particular tire treads.

Abstract: A tread for tires with radial carcass reinforcement and crown reinforcement ormed of at least two plies of cables or cords arranged at angles with the circumferential direction and intended for travel on sand or sandy soil, the tread being provided with closed cells to entrap the sandy soil, the area occupied by the cells being at least 20% of the actual area of contact of the tread with hard flat ground.