摘要:
La rustine à appliquer aux pneus radiaux sans chambre à air ou avec chambre à air ayant subi les ruptures de trois cordes métalliques ou plus dans leurs parties latérales, constitue un perfectionnement de la rustine avec goujon en caoutchouc de surface bombée selon la Demande de Brevet Européen n° 87114126.3 du même inventeur. Sa principale caractéristique réside non seulement dans le goujon en caoutchouc 2 à encastrer dans la fenêtre F découpée dans les parties latérales du pneu, dans la zone de laquelle sont enlevées les parties abimées des cordes métalliques, mais également dans le fait que la couche de caoutchouc 1 contenant les cordes métalliques radiales dont est pourvue la rustine est en relief par rapport à la surface d'attaque A, et a la même largeur et le même parcours trapézoïdal que la base du goujon en caoutchouc 2. Cela permet de placer la rustine de manière stable et précise en superposant ses cordes métalliques à celles du pneu ayant subi des ruptures: dans ce but, sur le prolongement de l'axe longitudinal de la fenêtre F, sont formées deux rainures C d'une largeur égale à celle de la fenêtre, c'est à dire du goujon en caoutchouc, et d'une profondeur égale à celle du caoutchouc qui recouvre à l'intérieur les cordes du pneu. D'importants avantages de la rustine selon cette invention sont représentés par la possibilité d'effectuer une substitution correcte des cordes métalliques abimées en rétablissant complètement les fonctionnalités du pneu, et par l'impossibilité que la rustine ne se déplace avant la vulcanisation au cours des phases du rechapage. Pour les références, voir fig.3.
摘要:
The method according to the invention allows the production of patch-rubbers intended to repair radial-ply and bias-ply tires. Said patch-rubbers, while showing the same strength as the nowadays known, are more flexible and do not affect the original mechanical features and performances of the regions of the tires having been repaired therewith. The patch-rubbers obtained by implementing the method are also suitable to perform retreading operations on tires by means of both high pressure molding machines and autoclaves. The method essentially consists in inclining, in respect of the longitudinal or symmetry axes of the patch-rubbers, alternatively in the clockwise and in the counterclockwise direction, the cords made of a fibre and embedded into each one ply of a plurality of superposed plies, and in superposing to said plies, having said cords made of a fibre embedded therein, a further ply of smaller area having rectilinear metallic or fibre cords embedded therein; said further ply being so positioned that, when the patch-rubber is applied to the tire to be repaired, said metallic or fibre cords either match the direction of the radial metallic cords forming the casing of radial-ply tires in the sidewalls and in the tread respectively, or form a given angle with the direction of the biased metallic cords forming the casing of bias-ply tires.
摘要:
The patch-rubber according to the invention is intended to effect a restoration, previous or not to a retreading, of radial-ply tires in which some of the metallic cords embedded in their sidewalls are broken. Contrary to the rectangularly shaped patch-rubbers formed by a plurality of rectangularly shaped plies whereby both metallic cords and the cords made of a fibre embedded in the various plies are parallel to each other and to the longitudinal axis A of the patch-rubber, the patch-rubber according to the invention is trapezoidally shaped, the metallic cords embedded therein are radially arranged like those embedded into the sidewalls of the tires, and the cords made of a fibre are inclined relative to the longitudinal or symmetry axis A of the whole patch-rubber. The patch-rubber is further provided with a rubber dowel showing dimensions matching those of a window opening cut-out from the tire sidewalls, in the zone thereof where the broken metallic cords have been taken away, said rubber dowel being to be inserted into said window opening. Moreover, on account of its peculiar pre-bent structure, stabilized by a vulcanization process, the patch-rubber may be easily put in use without being submitted to stresses in condition where no load is applied to the tire. The rubber dowel further ensures the quick and precise positioning of the whole patch-rubber with its metallic cords arranged parallel to those of the tire.
摘要:
The method according to the invention allows the production of patch-rubbers intended to repair radial-ply and bias-ply tires. Said patch-rubbers, while showing the same strength as the nowadays known, are more flexible and do not affect the original mechanical features and performances of the regions of the tires having been repaired therewith. The patch-rubbers obtained by implementing the method are also suitable to perform retreading operations on tires by means of both high pressure molding machines and autoclaves. The method essentially consists in inclining, in respect of the longitudinal or symmetry axes of the patch-rubbers, alternatively in the clockwise and in the counterclockwise direction, the cords made of a fibre and embedded into each one ply of a plurality of superposed plies, and in superposing to said plies, having said cords made of a fibre embedded therein, a further ply of smaller area having rectilinear metallic or fibre cords embedded therein; said further ply being so positioned that, when the patch-rubber is applied to the tire to be repaired, said metallic or fibre cords either match the direction of the radial metallic cords forming the casing of radial-ply tires in the sidewalls and in the tread respectively, or form a given angle with the direction of the biased metallic cords forming the casing of bias-ply tires.
摘要:
The patch-rubber according to the invention is intended to effect a restoration, previous or not to a retreading, of radial-ply tires in which some of the metallic cords embedded in their sidewalls are broken. Contrary to the rectangularly shaped patch-rubbers formed by a plurality of rectangularly shaped plies whereby both metallic cords and the cords made of a fibre embedded in the various plies are parallel to each other and to the longitudinal axis A of the patch-rubber, the patch-rubber according to the invention is trapezoidally shaped, the metallic cords embedded therein are radially arranged like those embedded into the sidewalls of the tires, and the cords made of a fibre are inclined relative to the longitudinal or symmetry axis A of the whole patch-rubber. The patch-rubber is further provided with a rubber dowel showing dimensions matching those of a window opening cut-out from the tire sidewalls, in the zone thereof where the broken metallic cords have been taken away, said rubber dowel being to be inserted into said window opening. Moreover, on account of its peculiar pre-bent structure, stabilized by a vulcanization process, the patch-rubber may be easily put in use without being submitted to stresses in condition where no load is applied to the tire. The rubber dowel further ensures the quick and precise positioning of the whole patch-rubber with its metallic cords arranged parallel to those of the tire.