Abstract: A mold for molding and vulcanizing a rubber tire comprises a rigid core defining an interior surface of the tire, two side parts and a peripheral ring divided into a plurality of segments. In order to be able to close the mold, all the members are designed to slide on each other during final phase of their closing movement.

Abstract: In order to monitor gas leakage in the tires of a vehicle, absolute gas psure and temperature in the tires are first simultaneously measured. A ratio of the measured pressure to the measured temperature for reach of the tires is then calculated. The calculated ratios are then compared to produce an indicator N and an alarm is issued when this indicator N deviates from a predetermined range of values.

Abstract: To provide good handling behavior for a motorcycle, the belt of the rear motorcycle tire has threads extending parallel to the equatorial plane and the slip angles of the tires as a function of the camber (slip angle .delta. as a function of camber angle .gamma.) are such that the difference: front slip angle .delta.2 minus rear slip angle .delta.1 as a function of camber angle .gamma. is an invariably increasing function of .gamma..

Abstract: The elastic tire (1) is composed of a plurality of elastic elements (3) ped between the nondeformable anchoring zone (2) and the tread (4). Each elastic element (3) comprises two connecting elements (34) and (35) the ends of which form a quadrilateral and an arm (31) guided by the connecting elements and joined to the tread (4).

Abstract: A device and electric circuit mounted on a wheel of a vehicle and to transmit via bearings an electrical signal for measurement of parameters such as the pressure and temperature of the tire. The measurement is made based on the conduction state of a semiconductor element coupled to a sensor sensing the tire pressure and/or temperature. Specifically observed are three resistances of sufficient different values: the resistance of a semiconductor element in the on-state, a resistance R.sub.o two orders of magnitude greater than the preceding one and the internal resistance of at least one semiconductor element in the off-state. The sensor and circuit ar integrated in a standard valve. In one embodiment, it is possible to operate an electric element mounted on the wheel.

Abstract: A device for locking the beads of a tire against flanges of a multi-piece rim comprises two main parts. The first part having an approximately cylindrical shape is formed essentially of a flexible material. It is strapped by a second part which is nonextensible radially.

Abstract: A method of obtaining a reinforcing assembly comprising reinforcement threads and a solid matrix is characterized by the fact that reinforcement threads surrounded individually by a sheathing of organic material I and furthermore surrounded by another sheathing of organic material II are grouped together, by the fact that the material II is caused to migrate into voids between the threads sheathed with material I and by the fact that the material II is caused to solidify.

Abstract: A device for assembling at least two threads comprises two groups of bobbins; a wall and means for driving the wall in rotation around an axis; and means for twisting a first thread in the direction of rotation of the wall, the twisting means permitting the first thread to come into contact with the inner face of the wall and to turn around the axis while turning around the second bobbin.

Abstract: A material intended to form a joint between at least two bodies on the outside of their interface, at least one of the bodies being deformable, is characterized by the following features:(a) it is formed of a fluid mixture having a viscosity, measured at normal temperature, of from 0.3 Pa.s to 700 Pa.s;(b) a dry extract of the fluid mixture, measured at normal temperature and pressure, is from 20% by weight to 80% by weight, based on the weight of the fluid mixture;(c) the dry extract of the fluid mixture comprises an elastomer fraction at least 20% by weight of which elastomer fraction is formed of at least one unsaturated elastomer capable of cross-linking either at ambient temperature or by heating for a period of time of less than one minute.Methods for producing assemblies with this material, consisting, for instance, of manufacturing, repairing or recapping a tire.Assemblies obtained by these methods.

Abstract: In order to reduce the heating at the edges of the tread reinforcement plies, the additional working ply has an axial width which is between 1.05 times the axial width of the tread and 1.1 times the maximum axial width of the radial carcass reinforcement. The cables of this additional working ply follow a geodesic trace and form an angle of between 25.degree. and 65.degree. with the equatorial plane of the tire.

Abstract: A process of preparing a bimodal or multimodal homopolymer of a conjugated diene or a bimodal or multimodal copolymer of a conjugated diene with another conjugated diene or with a vinyl aromatic compound consists in polymerizing the monomer(s) in a reaction medium at a temperature of between 20.degree. C. and 200.degree. C. in the presence of a catalytic system comprising an organolithium initiator, a barium, strontium or calcium compound, and an organometallic compound of a metal of group 2B or 3A of the periodic classification of elements of the Mendeleev Table and adding hydrogen as a modifying agent to the reaction medium during the course of the polymerization reaction.

Abstract: A spare tire which is expandable by inflation, having a radial carcass reinforcement anchored to at least one bead ring in each bead and having a tread reinforcement formed of at least two plies of cables which are parallel in each ply and crossed from one ply to the next and form acute angles with the longitudinal direction of the tire, is improved due to the fact that the plies are composed of cables whose elasticity decreases as the inflation pressure increases and as the tire passes from the collapsed condition to the expanded condition ready for travel.

Abstract: A device for simultaneously supporting a tire which is to be recapped and for applying hermetically against the sidewalls of said tire a flexible sheathing which is connected to a source of vacuum comprises support means for supporting the tire by its beads and for varying the distance between the beads; annular means intended to be applied against the flexible sheathing in the region of the sidewalls of the tire; bearing means supporting both said support means and said annular means, said bearing means facing each other with an adjustable axial distance between them; and connecting means connecting said bearing means to each other and making it possible to vary the distance between said bearing means.

Abstract: The tread reinforcement of a high-speed radial tire comprises at least one folded ply of twisted metal cords. The direction of the fold of the ply, the direction of the inclination of the cords with respect to the circumferential direction of the tire, and the direction of the twist of the cords are such, relative to one another, that the cords are relatively untwisted at the fold. Thus, in the case where the ply is folded radially outward, the folded ply and the cords composing it are both type S or both type Z, while in the case where the ply is folded radially inward, the folded ply and the cords composing it are of opposite S/Z type.

Abstract: A pneumatic tire comprises a bead, a package bead ring in the bead, and a carcass reinforcement turned around the bead ring. The bead ring comprises at least one wire having a cross section of a quadrilateral with two parallel opposite faces. The wire or wires form multiple turns around the tire through the bead that are contiguous in directions extending both radially and axially of the tire.

Abstract: Tires, especially radial carcass tires, have the properties of their sidewalls improved by forming at least the outer surface of the sidewalls from organic peroxide vulcanizates of one or more mixes of elastomers of the diene type and of the ethylene-propylene type.

Abstract: Thin, continuous steel wires are produced by solidification of a jet of liquid steel projected into a cooling fluid. The solidication is initiated and accelerated by the presence of oxygen in the cooling fluid and by selection of the relative amounts of silicon and manganese in the liquid steel so as to provide solid silica as the oxidation product which is principally formed.