Abstract: A pneumatic tire having an excellent cut resistance is disclosed, which comprises an annular crown portion constituting a tread, a pair of side portions supporting said crown portion, a pair of bead portions located at each foot of said side portions for fitting to a rim, a carcass layer composed of at least one rubberized cord ply toroidally extending between said bead portions and a liner layer disposed indise and adjacent to said carcass layer.In the tire according to the invention, a fault surface having an extremely low adhesion which intercepts the crack growth from the outside of the tire is further arranged in said liner layer at at least a part of a region extending between said bead portions.

Abstract: A pneumatic tire is disclosed, which comprises a carcass composed of at least one ply and an inner liner arranged inside the carcass and composed of plural rubber layers. In the tire of this type, the inner liner comprises at least three layers of an outermost layer adjacent to the carcass, an innermost layer facing the inner space of the tire and an intermediate layer interposed between the innermost and outermost layers. The innermost layer is composed of a rubber composition containing 15-60 parts by weight of natural rubber and the balance of a halogenated butyl polymer as a rubber component, while the intermediate layer is composed of a rubber composition containing only a halogenated butyl polymer as a rubber component, which is different from that of the outermost layer in the rubber component.

Abstract: A composition comprising at least one sulfur-vulcanizable rubber, this composition being intended to adhere to at least one metallic surface during the course of vulcanization, is characterized by the fact that it further comprises from 0.1 to 2 parts by weight of nickel, present in the form of nickel (II) acetylacetonate, per 100 parts by weight of rubber.

Abstract: A method and apparatus for heating pressure vessels used in the tire retreading and tire repairing industry which includes a plurality of heat exchangers in the form of plate coils associated with the pressure vessel with steam being circulated through the plate coils for heating the pressure vessel to a temperature required for vulcanizing rubber. Steam is supplied from a boiler and returned to a condensate return tank through valves and traps in order to provide a closed loop system with the steam being produced by the boiler passing through steam lines into the upper end portions of the plate coils which are attached to the pressure vessel, either interiorly or exteriorly, in a manner to radiate heat into the insulated pressure vessel in order to raise the temperature interiorly of the vessel to that required for vulcanizing rubber.

Abstract: An adjustable tire building drum is disclosed for use during strip winding of OTR tire treads having nine replaceable segments with interfitting fingers extending circumferentially to define a rigid generally cylindrical shell whose diameter and axial length may readily be adjusted for a wide variety of different tire sizes. A unique precision actuating mechanism is provided for adjusting the segments radially including a heavy cantilever link and an associated stabilizing arm for each segment which maintains rigidity even when the segmental shell is expanded 90 to 100 percent.

Abstract: A pneumatic tire having a tread with a mid-circumferential plane and a plurality of circumferential grooves therein of two different configurations. The grooves of each configuration have differing widths and are interspersed together so that the total area of grooves on each side of said plane are equal.

Abstract: Radial tires having highly improved durable life by using a rubber composition prepared by incorporating a given amount of a primary fatty acid having 6-10 carbon atoms and/or metal salts of thereof to a rubber for embedding rubber for steel cords in belt portion or carcass portion of radial tires. By further adding thereto cobalt salt of organic acids other than the above described fatty acids and/or boric acid or a metal salt of boric acid, the corrosion resistance of steel cords is synergistically improved.

Abstract: A heavy duty pneumatic radial tire is disclosed, which comprises a tread portion, a pair of side portions, a pair of bead portions each reinforced with a bead ring, a radial carcass ply, a metal cord reinforcing layer and a composite rubber filler. In this tire, the carcass ply is a rubberized layer of aromatic polyamide fiber cords and a tip of its turnup portion terminates at a position lower than an upper end of a rim flange when the tire is mounted on a rim. In the metal cord reinforcing layer, one end facing the turnup portion terminates over the tip of the turnup portion and the other end facing the carcass ply extends toward the side portion over a position corresponding to the above-mentioned one end facing the turnup portion.

Abstract: A method and apparatus for retreading vehicle tires. A carcass is provided with a prevulcanized tread and an unvulcanized tie-gum layer between the carcass and tread. A microwave applicator is located above the tread to emit microwaves against the tire for generating heat energy in the tire whereby the tie-gum layer is vulcanized. Vulcanization of the edges of the tie-gum layer is facilitated by local heating at or in connection with said edges by heat generation outside of the tire. The heating can be effected either by utilizing a material with a high dissipation factor for microwave energy or, alternatively, by use of electric resistance wires.

Abstract: The side wall (5) of a pneumatic tire comprises an at least double encirculating multi-layer winding (9, 12) which is joined in an interlacing manner with the laterally adjacent winding (9, 12) by means of staggered layers (10, 11, 13, 14).

Abstract: A tire consisting of an air-tight internal panel (1), carcass (2), wire cap (10), hump strip (9), belt (5), tread (6), shoulder portion (7), wire core (11) and lateral portion (8), whereby a combined prefabricated air-tight panel (1) with carcass fabric (2) in special rubber mixture encircles at least twice and on which is at least a double encircling coil (5) with textile treads crossing each other in more than three layers.

Abstract: A pneumatic radial tire for passenger cars having a low rolling resistance and an excellent wet skid resistance is disclosed. The radial tire comprises a carcass of a radial construction toroidally extending between a pair of bead cores with the ends turned thereover, a tread portion arranged outside a crown portion of the carcass and having a two laminate structure of tread base rubber and tread cap rubber, and a reinforcing belt layer embedded in the tread base rubber and superimposed about the crown portion of the carcass. The tread base rubber and tread cap rubber have resiliences of not less than 65% and not more than 60%, respectively. The tread portion has a sectional ratio of a sectional area of the tread cap rubber occupied in the equatorial section of tire to a total sectional area of the tread portion of not less than 50% and a negative ratio of not more than 45%. The belt layer has a flatness of not more than 15%.

Abstract: A process for making a radial tire comprises steps of transforming a cylindrical tire carcass assembly into a toroidal shape, laying over a given number of belts, winding a plurality of synthetic fiber threads, laying over a tread cap, transforming the tire carcass assembly to such an extent that the upper surface thereof contacts substantially all over the lower surface of the belts, joining integrally these tire components to form a green tire, and subjecting the green tire to vulcanization in a vulcanizing mold.The synthetic fiber threads are wound over the belts in the circumferential direction with a space of 5 mm to 15 mm left between each adjacent thread in the range of more than 70% of the width of the belts.

Abstract: A heavy duty pneumatic radial tire is disclosed, which comprises a carcass composed of at least one rubberized ply containing cords arranged substantially in a radial plane of the tire and a belt superimposed about a crown portion of the carcass just beneath a tread and composed of at least three rubberized belt plies. In this tire, metal cords of a first belt ply nearest to the carcass among the above belt plies are arranged at an angle of 25.degree.-50.degree. without crossing with metal cords of a second belt ply near the carcass next to the first belt ply with respect to a central circumferential line of the tire, and metal cords of the second belt ply and a third belt ply near the carcass next to the second belt ply, a tensile strength of each of which being 1.5-2 times that of the metal cord of the first belt ply, are arranged at an angle of 10.degree.-30.degree.

Abstract: An apparatus and method wherein strip material is clamped to a shuttle finger slidably mounted in a shuttle casing which in turn is slidably mounted on a strip applier frame. The shuttle casing and shuttle finger are movable simultaneously from a retracted first position to a second position with the end of the shuttle casing adjacent an applicator roll. The shuttle finger is then movable by itself from the second position to a third position for transferring a tongue portion of the strip onto the applicator roll. The tongue portion may then be elevated into clamping engagement with the drum and the strip released from the shuttle finger. The shuttle casing and shuttle finger may then be returned to the first position, the drum rotated a predetermined amount to partially wrap the strip around the drum and the strip cut at a predetermined location whereupon the drum is rotated to fully wrap the strip of flexible material around the drum.

Abstract: A tire with a crown comprising a strengthening reinforcement and at least one protective ply arranged above the strengthening reinforcement is characterized by the fact that the protective ply has the following features: it comprises a three-dimensional fabric impregnated with rubber; the fabric comprises warp threads and woof threads; the warp threads and the woof threads undulate; the warp threads and the woof threads are made with one or more materials whose rupture stress is less than 140 kg/mm.sup.2 ; and the porosity of the fabric before impregnation with rubber varies from 60% to 90%.

Abstract: An asymmetrical belt for a radial carcass pneumatic tire comprises two steel plies of which one ply is a single cut ply and the other ply is a folded ply comprising a main body portion and a radially outwardly folded portion. The two plies are arranged such that the single cut ply is situated radially outwardly of the folded ply with one end portion lying within the bite formed by the fold of the folded ply. The belt configuration further comprises a textile ply which extends across the median portion and the non enclosed end portion of the single cut ply. The textile ply is preferably composed of parallel cords making an angle of not more than 10.degree. with the mid-circumferential plane of the tire.

Abstract: A high-durable pneumatic radial tire is disclosed. In the tire of this type, steel cords each made from particular steel filaments are used in at least one of belt and carcass. This steel filament has a pearlite structure having an average value of interlamellar distance between cementites of 300-500 .ANG., and a tensile strength of not less than 220 kgf/mm.sup.2.

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 pneumatic tire includes a tread, a pair of sidewalls and a pair of bead portions and further a carcass and a belt for reinforcing the tread, sidewalls and bead portions. The carcass consists of at least one layer of rubber coated cord ply whose organic fiber cords are arranged in parallel with each other in substantially radial surfaces of the tire. The belt consists of a rubber coated metal cord layer folded at least at one edge, whose metal cords are arranged in parallel with each other at relatively small angles with respect to an equatorial line of the tire.According to the invention, a reinforcing layer of at least one rubber coated layer is arranged in an inside of and in substantially intimate contact with the folded edge of the rubber coated metal cord layer of the belt and extending at least 7% of an overall width of the belt from a folded position of the belt. Cords of the reinforcing layer are organic fiber cords and are in parallel with each other at angles of 0.degree.-40.degree.