Abstract: A heavy duty radial tire having a tread of a double zigzag pattern, wherein the main groove is formed into a zigzag and further the ridge of a rib adjacent to the zigzag main groove is formed into a zigzag, whose pitch and amplitude are considerably smaller than those of the zigzag main groove, has a high irregular wear resistance without deteriorating the wet performance of the tire.

Abstract: A composite tread has at least a low hysteresis component and a high hysteresis component therein. The components are geometrically arranged such that upon wear, generally more of the high hysteresis compound is exposed as wear progresses which imparts good traction to the life of the tread.

Abstract: During the winding of the layers of the wires of a tire bead ring, a piece of ribbon is interposed at least twice per revolution between two consecutive layers of wires, the ribbon being formed of a thin flexible support bearing on each of its faces a layer of a material which adheres both to the support and to the wires.

Abstract: There is disclosed herein a method of manufacturing low aspect radial tires. The radial tires are mounted upon a bladder assembly during the time from the assembly of the tread reinforcing structure with the carcass until the vulcanization of the tire in a mold. Restrictor band material is wrapped around the tire to prevent circumferential growth of the tire beyond a predetermined diameter, so that the tire will not become too large to fit into the mold.

Abstract: A radial tire forming apparatus wherein a first stage forming arrangement comprising a carcass band forming drum, green case forming drum and band transfer, and a second stage forming arrangement comprising a belt-tread structure forming drum, raw tire forming drum and belt-tread transfer, are so arranged that the above mentioned respective forming drums may be positioned on the same axis. A green case transfer is set above the first and second stage forming arrangements and improvements in the green case transfer and further a novel formation of a gripping device for forming the green case transfer are provided.

Abstract: A pneumatic radial tire having highly durable bead structure is disclosed. One or more carcass ply layers of steel cords are turned up around a bead core from the inside to the outside. A reinforcing strip of steel cords is positioned outwardly adjacent to and without extending radially outwardly beyond the turn-ups of carcass plies. A bead filler of approximately triangular sectional shape is disposed at the region enclosed by the carcass plies and the turn-ups of the carcass plies. The bead filler comprises high hardness rubber stock and medium hardness rubber stock. A cap of organic textile cord fabric covers an upper end of the carcass plies. A fin-shaped rubber buffer having a hardness lower than that of the medium hardness rubber stock by 3.degree. to 20.degree. is disposed radially outwardly of the capped end and axially outwardly adjacent to the medium hardness rubber stock. A reinforcing strip of organic textile cords may be further disposed outwardly adjacent to the reinforcing strip of steel cords.

Abstract: A motor vehicle pneumatic tire is made of polyurethane or another similar moldable material which hardens into an elastic plastic material and which has a substantially cylindrical or cylindrical belt insert mounted beneath the tread substantially composed of threads, wires or similar stability support elements which are mounted in the circumferential direction of the tire in a spaced-apart manner at a distance of 0.5-3.0 mm and which elements have a cross section of 0.5-2.5 mm. The stability support and the plastic mass of the belt insert encompassing the same having a tensile strength in the circumferential direction of at least 3 Mill.N and the elements of the stability support have a breaking strength of at least 1,500 N.

Abstract: A tire whose crown is extended on both sides by a sidewall terminating in a bead and is provided with a tread formed in the major part of adjacent blocks separated from each other in the axial direction of the tire by circumferential or oblique grooves is characterized by the fact that at least some of the circumferential or oblique grooves separating the adjacent blocks in the axial direction have a cross section which decreases substantially from the leading edge to the trailing edge of the blocks.

Abstract: A pneumatic tire is disclosed which comprises a tread, a carcass cord layer and at least two belt reinforcing layers disposed between the tread and the carcass cord layer, wherein the reinforcing cord of one of the belt reinforcing layers has an angle of 15.degree. to 30.degree. with respect to the circumferential direction of the tire and the reinforcing cord of the other makes an angle of 150.degree. to 165.degree. to the circumferential direction. The carcass cord layer consists of only one layer and the reinforcing cord thereof makes an angle of 66.degree. to 82.degree. with respect to the circumferential direction of the tire.

Abstract: A pneumatic radial tire is disclosed which comprises a tread, a carcass cord layer and at least two belt reinforcing layers disposed between the tread and the carcass cord layer, the reinforcing cord of one of the belt reinforcing layers having an angle of 15 to 30 degrees with respect to the tire circumferential direction and the reinforcing cord of the other of the belt reinforcing layers having an angle of 150 to 165 degrees with respect to the tire circumferential direction. The carcass cord layer consists of upper and lower two layers, and the angle .alpha..sub.2 of the reinforcing cord of the upper carcass cord layer with respect to the tire circumferential direction and the angle .alpha..sub.1 of the reinforcing cord of the lower carcass cord layer with respect to the tire circumferential direction satisfy the following relations:1/2(.alpha..sub.1 +.alpha..sub.2)=96.degree. to 108.degree.(.alpha..sub.2 -.alpha..sub.1)=10.degree. to 40.degree..

Abstract: A lorry tire which is filled with compressed air during normal operation and which has the necessary stability for continued movement and has adequate running properties even in the case of a loss of air, due to its low height to width ratio, its flat tread curvature and its relatively rigid and thick sidewalls.

Abstract: A method of manufacturing a tire comprises a first process including the steps of forming a carcass ply or the like to a cylindrical configuration, placing bead cores on the cylindrical carcass ply and then effecting assembly of a carcass ply-bead core structure. A second process of the method includes the steps of receiving the structure from the last step in the first process, effecting assembly of a cylindrical carcass layer and then deforming the latter into a trochoidal configuration to obtain a green tire, wherein the carcass ply located between both the bead cores on the structure is caused to expand either in the first process or in the second process. The structure is placed on a drum device in the second process, the bead cores are wrapped with the end portions of the carcass ply and then the green tire for the radial tire is assembled by attaching side wall members or the like.

Abstract: In repairing articles of natural rubber or elastomer predominantly of natural rubber with cured polymer or prepolymer (polyurethane/polyurea), adhering advantages are obtained especially at elevated temperatures when the damaged area is treated with halogen-containing oxidant dissolved in 1,2-dichloroethane instead of other solvents.

Abstract: For automatically feeding a rubbery strip to a tire-building drum for the production of, for example, a green tire, the rubbery strip is forwardly conveyed toward the tire-building drum until a leading end portion thereof is received on a smooth surface with one face of the leading end portion directed toward the tire-building drum so as to establish close contact between the other face of the leading end portion of the rubbery strip and the smooth surface portion throughout the width of the rubbery strip whereby the leading end portion of the rubbery strip is detachably retained to the smooth surface portion, whereupon the leading end portion of the rubbery strip is transferred from the surface portion to the tire-building drum for permitting the leading end portion of the strip to be wrapped round the tire-building drum and thereafter the leading end portion of the rubbery strip is cut from the remainder of the strip for forming a cut segment having a predetermined length, the tire-building drum being there

Abstract: A pneumatic tire is disclosed, which comprises a pair of bead portions each containing at least one bead core therein and a carcass of at least one rubberized ply extending between the bead portions and containing organic fiber cords therein and has a load applied to one bead core of not less than 6.0 kg/cm. In this tire, at least one tire-cord layer of organic fibers is further arranged as a flipper between the bead core and the carcass ply so that a distance between a portion of the bead core facing bead base and the carcass ply is within a range of 0.8-3.0 mm and at least 1/3 of the periphery of the bead core is covered with the tire-cord layer.

Abstract: A process of manufacturing a bladder which is to be disposed on each of axially opposite end portions of a tire building machine having a tire building drum, respectively, and is employed for turning back a ply cord bound on the tire building drum of the tire building machine, comprising of the steps of binding a bladder material on a cylindrical member, the bladder material being reinforced with cords and unvulcanized, the cylindrical member having two annular grooves formed in the outer peripheral portion thereof, binding a cloth belt containing water around the outer peripheral surface of the bladder material so that the bladder material is shaped conformingly to the outer peripheral portion of the cylindrical member and the two annular grooves, vulcanizing in a vulcanizing vessel the bladder material to form two annular ridges on the bladder material conformingly to the shape of the annular groove, and taking out the bladder material from the vulcanizing vessel and turning back the bladder material around

Abstract: A pneumatic tire having a pocket filled with lubricant attached to the inner sidewall of the tire having a puncture sealant surrounded by an O-ring built into the inside wall of the pocket. The puncture sealant allows lubricant to be injected into the pocket by use of a syringe and eliminates the need for subsequent sealing of the pocket and leakage of lubricant from the pocket.

Abstract: A filament, and optionally a cord of cabled filaments, as a composite of (A) a filament and/or cord of steel, (B) a brass and/or zinc coating thereon and (C) a undercoat comprised of selected compounds. The invention further relates to a composite of such filament and/or cord as a reinforcement with rubber.

Abstract: A pneumatic tire which comprises:a tread portion; a breaker structure to brace the tread portion; two sidewalls each having an associated bead containing a bead core, and each sidewall containing a reinforcing ply of cords anchored around the bead core of the respective one of said associated beads and extending into the tread portion radially outwardly of the breaker structure to overlap at least part of the width of the breaker structure but terminating short of the other of said associated beads.

Abstract: A vehicle tire crown portion 10 including a tread 11 is injection molded and prevulcanized in a closed annular mold cavity 17 defined by a segmented outer mold 16 clamped together by a locking ring 22 and a segmented core 19 pressed against the outer mold by upper and lower pressure plates 25, 26. The core is then removed by disassembling its segments, whereafter a carcass 14 and prevulcanized sidewalls 12, 13 are placed in the central portion of the mold on an inflatable air bag 38 flanked by lateral mold section 39, 40. The vulcanization of the tire assembly is then completed, during which the sidewalls are joined to the retained crown portion.