Abstract: A structure for a radial tire for trucks and buses having textile cords in its carcass ply layer and steel cords in its belt layer is disclosed. The tire of this invention has a tread angle within a certain range, which angle is taken such as to be constituted by a line directed from a width-end point of the tire to a width-end point of the tread and a line directed from the width-end point of the tread in the straight vertical direction. More specifically, the ratio of the width of the tread to the width of the tire is so arranged that the tread angle with full air pressure be 17.degree..+-.3.degree. and the difference between the tread angle with full air pressure and the tread angle with an air pressure of 0.5 kg/cm.sup.2 be 3.degree. or less.

Abstract: A radial tire for trucks and buses which includes a belt layer whose steel cords are disposed at an angle of 15.degree. to 25.degree. relative to the circumferential direction of the tire and a carcass layer whose cord material is selected from materials having a K value equal to 10 to 15 as calculated by the equation K=E/T, where E is the tensile modulus of the cord material in kg/mm.sup.2 and T is the breaking strength per unit area of the cord material in kg/mm.sup.2. In accordance with various disclosed embodiments, the belt layer may be a three ply structure with the outer two plies substantially parallel with one another to provide a higher resistance to shock bursts; separation in such a belt layer may be further restrained by making the sum of the cord end counts per unit width of the second and third plies 1.50 to 1.

Abstract: A molded polyurethane article consisting of a foamed polyurethane core and a polyurethane surface skin layer as molded together as an integral unit. The above polyurethane article is produced by forming the surface skin layer of a surface-forming polyurethane composition rendered thixotropic by adding an aliphatic or functionally equivalent primary diamine as one of active hydrogen compounds in the composition and the surface layer so formed is caused to be bonded to a polyurethane core upon foaming of a foamable polyurethane composition to provide an integral article.

Abstract: A process for preparing an integral-skinned polyurethane foam wherein a foamable composition for formation of polyurethane which comprises a polyol, polyisocyanate, cross-linking agent, catalyst, and blowing agent is reacted and expanded in a mold, characterized in that(a) said polyol is a polyether polyol having a terminal ethylene oxide adduct rate of at least 60%, an OH number of 20 to 100 and a functionality of 4 to 8, or a polyester polyol having a functionality of 4 to 8;(b) said polyisocyanate is a non-aromatic polyisocyanate having an isocyanate index of 90 to 130;(c) said cross-linking agent is diethanolamine and ranges from 0.5 to 20 parts by weight based on 100 parts by weight of said polyol;(d) said catalyst is an organometallic salt; and(e) said blowing agent is a halogenated hydrocarbon of a low boiling point.

Abstract: A relatively high speed and heavy duty bias tire for use in trucks, buses, construction vehicles and the like. In case .beta.>.gamma. wherein .beta. is the slant angle of the face of the groove walls on the center line side and .gamma. is the slant angle of the face of groove walls on the shoulder line side, .beta.=5.degree. to 45.degree., .beta.-.gamma.=1.degree. to 16.degree. and .beta./.gamma.=1.10 to 2.00. In case .beta.=.gamma., then the radius R.sub.1 of curvature between the bottom of the groove walls and the center line side face and the radius R.sub.2 of curvature between the bottom of the groove walls and the shoulder line side face are in the relationships R.sub.1 > R.sub.2 and R.sub.1 /R.sub.2 =1.10 to 2.00.

Abstract: A boot for covering the juncture between a drive shaft and a universal joint casing formed of a resilient material and having a small end portion and a large end portion with a bellows structure therebetween. The bellows has undulations with ridges and valleys with ridge angles determined such that contact between adjacent undulations when the boot is operatively connected is confined to a plane. Preferably, the thickness of the resilient material is greater in a longitudinally center portion than in the remaining portions of the bellows and the distance between neighboring ridges in the central portion is greater than in the remaining portions.

Abstract: A radial tire having carcass plies of polyester cords in which all or part of carcass plies are folded from the inside of bead core to the outside and a steel chafer outside the folded edges or a reinforcing layer of organic fiber.The steel chafer has a cord angle of 15.degree.-45.degree., and a height H equal to 15-28% of the tire internal height IH. The maximum height h of the folded edges of the carcass plies is at most 85% of the height H of the steel chafer and the cord angle of the organic fiber reinforcing layer is 20.degree.-75.degree. with respect to the tire circumferential direction and 10.degree. or more with the cords in the steel chafer.

Abstract: A radial tire for heavy duty vehicles with a plurality of carcass ply layers made of textile cords having end portions of such layers turning round a bead core and having turnup along a bead filler is disclosed. The tire of this invention has its inner layers comprising thick cords, while outer layers comprises thin cords long enough to entirely cover the bead filler, whereby the bead filler is fully in contact with the outer layer made of thin cords.

Abstract: A radial tire for heavy duty use in vehicles. The tire has a carcass having a two-ply structure using polyester cords of more than 4500d as the ply cords. The spacing of the cords between the first and second plies at approximately the maximum tire width, is nearly 1.2-1.7 times as large as cord diameter. The edge portions of the ply cords turned up around bead cores are coated with the same rubber as ply coating rubber, an extension of the edge covering rubber from the edge of the ply cords is three times or more as large as cord diameter.

Abstract: Flexible expansion joints utilized for coupling conduit pipes or pipelines for conveyance, supply, service and drainage of service water, sewage, industrial water, etc. are provided, which comprise a tubular flexible body portion and two side joint portions. The tubular flexible body portion comprises bias cord reinforcement layer(s) provided circumferentially at a "cord angle" of 10.degree. to 45.degree.. Alternatively, it may further comprise circumferential cord reinforcement layer(s) circumferentially provided at a "cord angle" of 0.degree. to 25.degree. inside the bias cord reinforcement, and a plurality of coaxial rigid rings. The flexible expansion joints have good pliability, flexibility, vibration absorbing property, internal and external pressure resistance, durability, anti-deformation property and the like.

Abstract: A tire for construction vehicles including the lug type, the semi-lug type, and the block type with a ratio of 60-75 percent of the area of the projecting portion of the tread to the total area of the tread having the standard size of 16.00-25 or larger or the wide size of 20.5-25 or larger, wherein the size of the projecting portion of the tread is under the conditions specified by the following formulas:1.0.ltoreq.k.ltoreq.1.3 at 1/8 point1.0.ltoreq.k.ltoreq.1.6 at 1/4 pointsaid "k" designating the quotient of "a" the diameter of a maximum circle to be drawn within the width of the projecting portion by "h" designating the height of the grooves in the tread, and said 1/8 point and 1/4 point designating a point respectively 1/8 and 1/4 of the width of the tread from the end of the tread.

Abstract: Process for making a radial tire wherein a breaker ply layer and a tread layer are successively secured on the upper part of a first step assembly. The first step assembly consists of a carcass ply layer, bead portions and side wall rubbers. The tread layer is a composite form having a tread rubber, a pair of joint rubbers and a cushion rubber. Uneven surfaces are formed circumferentially containing therein the joint portions joint of the Joint rubbers and the side wall rubbers.

Abstract: An apparatus which is responsive to fluid pressure for detecting and indicating visually and accoustically the variation of pressure conditions such as the underinflation of vehicle tires. The apparatus comprises pressure sensors, annular conductive members, at least a pair of confronting heads, response means and indicating means. When the tire air pressure is normal, since the impedance value of the conductive members does not vary, the indicating device is not actuated. However, if the air pressure within even one of the tires becomes abnormal, the apparatus performs as designed and a signal emitted by the indicating device informs the driver of the abnormality.

Abstract: An assembly of a pneumatic tire and a wheel rim in which the tire is provided unitedly with at least one ring-formed projection area to the outside of the rolling axis direction of the tire and adjacent the rim flange, whereby safety and durability are maintained without causing the bead areas to separate from the rim when the tire is "run flat." The projection area is disposed and formed adjacent the rim flange at a specified diameter difference, and the bead area inward of the tire is formed at a specified inclination. Further, the projection area is reinforced circumferentially with a reinforcing material and has a rigid part comprising a high modulus rubber compound.

Abstract: An emulsion oil containing oil and water in a ratio of 5 - 9.5:5 - 0.5 by volume is burned by two-stage combustion method or by the combination of two-stage combustion method and exhaust gas recirculation method.