Abstract: A golf ball satisfies the following conditions (1) to (6): (1) the number of dimples is 360 to 492; (2) total volume enclosed by the dimples as expressed as a percentage of the volume of the golf ball, VR, is 0.715% to 0.825%; (3) the total surface area of the dimples as expressed as a percentage of the surface area of the golf ball, SR, is not less than 70%; (4) the cover has a Shore D hardness of 53 to 63; (5) the difference obtained through subtraction of JIS C hardness of the surface portion of the core from JIS C hardness of the cover is 0 to 20; and (6) initial velocity is in excess of 77.7 m/s (255 ft/s).
Abstract: Disclosed herein is a rubber composition for use in vibration insulating material, which comprises as rubber components 5-50 parts by weight of a copolymer consisting of 99.5-45% by weight of a conjugated diolefin, 0.5-30% by weight of an ethylenically unsaturated carboxylic acid and 0-40% by weight of another vinly monomer polymerizable therewith, and 50-95 parts by weight of at least one rubber selected from natural rubber and synthetic diene rubbers. This rubber composition is excellent in the breaking properties and vibration insulating properties with a small temperature dependence of hysteresis loss.
September 10, 1987
Date of Patent:
March 7, 1989
Bridgestone Tire Company Limited, Japan Synthetic Rubber Company Limited
Abstract: A pneumatic radial tire for motorcycle is disclosed, which comprises a tread, a pair of sidewalls, a carcass composed of at least one rubberized ply containing organic fiber cords arranged in a direction of approximately 90.degree. with respect to the equatorial plane of the tire, and a belt disposed between said tread and said carcass at a width corresponding to a tread width and composed of at least two rubberized plies each containing cords with a modulus of elasticity of at least 600 kg/mm.sup.2 arranged at an inclination angle of 15.degree.-30.degree. with respect to the equatorial plane of the tire. In the tire, each end of the carcass is wrapped around a bead ring embedded in each radially inner end portion of the sidewalls toward a direction of the tread to form a turnup portion; a tapered rubber filler extending from an upper part of the bead ring toward the tread direction and having a Shore A hardness of at least 60.degree.
Abstract: A pneumatic tire for a two-wheeled vehicle, including a pair of sidewalls, a tread, a carcass, bead rings embedded in radially inner ends of the pair of sidewalls and stiffeners including tapered rubber fillers. According to the invention, the tire comprises a belt layer between the tread and the carcass. The belt layer consists of at least one ply whose width is at least 0.5 time of a width of the tread. Cords of the ply have a modulus of elasticity of at least 600 kg/mm.sup.2 and are arranged substantially in parallel with an equatorial plane of the tire.The tire according to the invention maintains a hoop effect of the belt layer to sufficiently exhibit characteristics as a radial tire and eliminates an extreme difference in bending rigidity in radial directions over from the tread to the sidewalls to obtain smooth turning of the two wheeled vehicle at a corner.
Abstract: A radial tire for passenger cars comprising a rubber filler interposed between a turn-up portion of a carcass ply wound around a bead ring from the inside toward the outside thereof and the carcass ply and having a dynamic modulus of elasticity of at least 300 kg/cm.sup.2 and comprising an additional layer closely adhered to said rubber filler and composed of cords having a high modulus of elasticity which is larger than 2.5.times.10.sup.5 kg/cm.sup.2 and inclined at an angle within a range between 45.degree. and 75.degree. with respect to the carcass cord, the additional layer being arranged over a range which is 50% to 75% of the tire sectional height.
Abstract: A pneumatic radial tire comprising a carcass of a radial structure and a belt superimposed about a crown portion of the carcass is disclosed. The belt is composed of at least one open-twisted steel cord layer formed by embedding open-twisted steel cords. Each cord is composed of 4-5 steel filaments and having an elongation of 0.2-0.7% under a load of 5 kg/cord and a twisting pitch of 8-16 mm, in a coating rubber having a 100% modulus of 30-70 kg/cm.sup.2.
March 7, 1986
Date of Patent:
January 12, 1988
Bridgestone Tire Company Limited
Noboru Kusakabe, Masaaki Morimoto, Eiichi Koyama, Koichi Kojima
Abstract: A pneumatic radial tire is disclosed, which comprises a toroidal tire body extending from bead portions to a crown portion through sidewall portions, and a reinforcement for the tire body consisting of a carcass composed of at least one cord ply containing polyester fiber cords therein, which cord ply being wound around a bead core embedded in each of the bead portions from the inside of the tire to the outside thereof, and a belt composed of at least two ply layers superimposed around the crown portion of the carcass and containing cords arranged at a relatively small inclination angle with respect to the mid-circumferential plane of the tire, the cords of which being crossed with each other. In this type of the tire, the carcass line of the tire body at a mounted state of the tire on a normal rim under a normal internal pressure depicts such a radial profile in tire section that a ratio of R/R' is within a range of 0.65-0.
Abstract: A pneumatic tire for motorcycles is disclosed, which comprises a tread portion defining a maximum width of the tire, a pair of sidewall portions, a pair of bead portions, a carcass of radial or semi-radial structure composed of at least one rubberized cord ply containing organic fiber cords therein, and a belt superimposed about a crown region of the carcass and composed of at least one cord layer containing cords with a modulus of elasticity of at least 600 kgf/mm.sup.2 arranged at an angle of not more than 30.degree. with respect to the equatorial plane of the tire, and has an aspect ratio of not more than 86%.
Abstract: A pneumatic semi-radial tire for motorcycle is disclosed, which comprises a tread, a pair of sidewalls, a carcass composed of at least one rubberized ply containing organic fiber cords inclined at an angle of 50.degree.-85.degree. with respect to the equatorial plane of the tire, and a belt disposed between said tread and said carcass at a width corresponding to a tread width and composed of at least two rubberized plies each containing cords with a modulus of elasticity of at least 600 kg/mm.sup.2 arranged at an inclination angle of 15.degree.-30.degree. with respect to the equatorial plane of the tire.
Abstract: A heavy duty low-section pneumatic and a process for manufacturing the same are disclosed. This tire comprises a radial carcass toroidally extending between bead portions, a belt composed of a first and second belt layers successively superimposed around a crown portion of the carcass and a tread rubber having substantially the same width as the maximum width of the belt. In the belt, the first belt layer is composed of at least two cord plies each containing cords inclined at a small angle with respect to the equatorial plane of the tire, the cords of which being crossed with each other with respect to the equatorial plane, while the second belt layer is composed of at least one cord ply containing non-expansible or hardly expansible cords arranged in substantially parallel to the equatorial plane and extends over both sides of the first belt layer between the first belt layer and the carcass.
Abstract: A pneumatic radial tire having a high durability is disclosed, which comprises a carcass composed of at least one ply containing polyester fiber cords embedded in rubber. This polyester fiber cord has particular fiber properties and cord properties. Among the cord properties, the elongation under a tension of 2 g/D of the cord after the specific post-cure inflation treatment is not more than 4.5% and the sum of the elongation and heat shrinkage is not more than 8.0%.
Abstract: A sealant composition for the puncture-sealing tire and a method of producing the same are disclosed. This sealant composition is crosslinking-reaction type and comprises (A) at least one rubber, (B) a tackifier, (C) an acryloyl or methacryloyl group-containing polymerizable unsaturated compound, (D) a filler and (E) a photopolymerization initiator. In the production of the sealant composition, the component (A) is first reacted with the component (C) and then kneaded with the components (B), (D) and (E).
Abstract: A bead forming apparatus, comprising stationary and movable support members; a collapsible bead forming drum rotatable about an axis fixed with respect to the stationary support member; feed rollers mounted on the movable support member to drive the bead forming element toward the bead forming drum along a predetermined path, the rollers being rotatable about axes parallel with the axis of rotation of the bead forming drum and including a main feed roller, a first auxiliary feed roller to impart a coiling tendency to the bead forming element to be passed from the main feed roller toward the bead forming drum, and a second auxiliary feed roller to guide the bead forming element to travel past the first auxiliary feed roller toward the bead forming drum; cutting blades for cutting the bead forming element at a predetermined location on the aforesaid path; an aperture for retaining the leading end of the bead forming element extending from the second auxiliary feed roller at the aforesaid predetermined location;
Abstract: A vibration isolating device is disclosed, which comprises two vibration-damping fluid chambers, and a partition member interposed between the two fluid chambers and provided with a restricted passage. In this device, an auxiliary vibration-damping unit is arranged in one of the two fluid chambers subjected to vibrations from vibration source.
March 5, 1984
Date of Patent:
June 17, 1986
Bridgestone Tire Company Limited
Takuya Dan, Hiroshi Kojima, Michihiro Orikawa
Abstract: A tire building apparatus comprising: an extruder having an extrusion die comprising a doughnut-shaped die member and an axially elongated die member to provide for consecutively extruding a cylindrical-shaped material downwardly from space between the doughnut-shaped die member and the axially elongated die member; a tire supporting unit for supporting a green tire into which the cylindrical-shaped material is to be inserted; an expanding unit adapted to hold the cylindrical-shaped material from the inside of the green tire and to expand radially and outwardly the cylindrical-shaped material to bond to an inner surface of the green tire; a severing assembly on the tire supporting unit for severing to a predetermined length the cylindrical-shaped material inserted into the green tire; and a drive unit adapted to drive the tire supporting unit to move with respect to the extruder.