Patents Assigned to Bridgestone Tire Company, Ltd.
  • Patent number: 4553894
    Abstract: A method of and an apparatus for transferring annular articles from one stage to another, each article having a ferromagnetic element, comprising hanging the annular articles from a hanger bar having spacer elements arranged at spacings from each other, the articles suspended from the hanger bar being axially spaced apart in parallel from each other across the spacer elements and having center axes aligned with each other in a predetermined direction, and transferring the articles from the hanger bar to a subsequent stage by repeating the steps comprising transferring one of the articles from the hanger bar to a carrier member constructed of permanent magnet, the article transferred to the carrier member being attached to the carrier member with the ferromagnetic element attracted to the permanent magnet, moving the article transferred to the carrier member upwardly with respect to the hanger bar so that the article is disengaged from the two adjacent spacer elements, moving the carrier member away from the h
    Type: Grant
    Filed: December 20, 1983
    Date of Patent: November 19, 1985
    Assignee: Bridgestone Tire Company Ltd.
    Inventors: Makito Mukae, Tsuginori Oshima
  • Patent number: 4481327
    Abstract: Rubber compositions having improved tensile strength, elongation and modulus of unvulcanized rubbers without deteriorating physical properties of vulcanized rubbers are prepared by utilizing synergistic effect of addition of a filler having high reinforcing property and alkadiene sulfones in given amounts to natural rubber and/or dienic synthetic rubbers.
    Type: Grant
    Filed: December 29, 1982
    Date of Patent: November 6, 1984
    Assignee: Bridgestone Tire Company, Ltd.
    Inventors: Masaki Ogawa, Yasushi Hirata, Akira Tsuchikura
  • Patent number: 4442880
    Abstract: A heavy duty pneumatic tire having an improved durability is disclosed. This tire comprises a carcass of a bias structure composed of at least 12 rubberized laminated ply layers each containing organic fiber cords embedded therein, and divided into three inner, middle and outer ply groups by three bead cores, the cords of which are crossed with each other, as a reinforcement for a toroidal casing inclusive of a tread. In a region extending from an upper area of a bead portion of the casing within a range of 0.15 to 0.45 times a tire height as measured from a bead base of the tire, at least an average cord distance between adjacent ply layers at the middle and outer ply groups is made substantially wider than at the inner ply group and a cord distance between adjacent ply layers at the outer ply group is made substantially not more than at the middle ply group.
    Type: Grant
    Filed: April 13, 1983
    Date of Patent: April 17, 1984
    Assignee: Bridgestone Tire Company, Ltd.
    Inventor: Masanobu Takahashi
  • Patent number: 4062825
    Abstract: A polyurethane composition having high tear strength has been produced by mixing homogeneously 20 to 50 parts by weight of finely divided acidic silica particles, 100 parts by weight of isocyanate-terminated prepolymer and appropriate parts of curative, and curing the mixture in a manner well known in the prior art, where the ratio (l/d) of average chain distance (l) between adjacent crosslinking points of the cured polyurethane chains to average size (d) of finely divided silica particles is in the range of from 2.5 to 20.
    Type: Grant
    Filed: October 23, 1975
    Date of Patent: December 13, 1977
    Assignee: Bridgestone Tire Company, Ltd.
    Inventors: Yoji Watabe, Michio Ishii, Yutaka Iseda
  • Patent number: 4053446
    Abstract: Polydiene polyurethanes having high tear strength are obtained by using polydiene glycols, prepared with use of lithium-based catalyst, having a number average molecular weight of 1,000 to 5,000 and functionality of 1.8 - 2.1, diisocyanates and chain-extending agents, and by controlling chemical cross-link density being 4 .times. 10.sup.-5 mole/cc and less. When the chemical cross-link density is within the above range, elongation and tensile strength in addition to tear strength of the polyurethane are improved significantly. Furthermore, when 10 - 50 parts by weight of the specified carbon black are added to 100 parts by weight of the mixture of the prepolymer, the chain-extending agent and the additive prior to curing the prepolymer, these mechanical properties of the polyurethane are improved further.
    Type: Grant
    Filed: August 31, 1976
    Date of Patent: October 11, 1977
    Assignees: Bridgestone Tire Company, Ltd., Japan Synthetic Rubber Company, Ltd.
    Inventors: Yoji Watabe, Michio Ishii, Yutaka Iseda, Kouei Komatsu, Noboru Ohshima, Yozo Nakata, deceased
  • Patent number: 3947540
    Abstract: A method for curing tires especially adapted for curing very large-sized or so-called giant tires which have not been generally in such demand as to warrant mass production characterized by holding the curing mold in a stably closed locked condition during the curing process under purely mechanical force in contrast to hydraulic force such as heretofore employed, comprising the steps of placing a mold unit composed of upper and lower mold halves and containing a semi-shaped "green" tire upon a stand of a mechanical press having a plunger mechanism supporting an upper housing member moved by means of a crank gear, driving the crank gear to a first position located ahead of its lower dead center a predetermined amount whereby the plunger mechanism and housing section are smoothly and continuously moved through an arcuate path from a raised position to a lowered position at which the plunger mechanism and housing member are adjacent the upper mold half, adjusting the position of the plunger mechanism relative to
    Type: Grant
    Filed: January 14, 1974
    Date of Patent: March 30, 1976
    Assignees: Bridgestone Tire Company, Ltd., Kobe Steel, Ltd.
    Inventors: Mitsuo Hashimoto, Nobuo Kawakami, Kazuhiko Nakagawa, Yasuhiko Fujieda
  • Patent number: 3939890
    Abstract: A wide base type pneumatic tire for construction vehicle has a given sectional thickness distribution of crown portion, a tread pattern of lug arrangement and a crown radius of at least 75% of overall tire width, and is usable for dump truck, earth mover and the like.
    Type: Grant
    Filed: April 21, 1975
    Date of Patent: February 24, 1976
    Assignee: Bridgestone Tire Company, Ltd.
    Inventor: Masaru Abe
  • Patent number: 3939663
    Abstract: An oil fence having a directional control device consisting of rudder plates or wind receiver plates secured to vertical plates or skirts of the fence at an angle thereto, which are subjected to a force due to relative movement of water or wind to cause the fence to position at an angle relative to the direction of the movement of the water or wind, whereby when the oil fence is being tugged by a towing boat the oil fence line is positioned at an angle without being subjected to any bending moment or any other undue force so as to collect or recover pollutants, e.g., spilt oil effectively from water surface.
    Type: Grant
    Filed: September 27, 1974
    Date of Patent: February 24, 1976
    Assignee: Bridgestone Tire Company, Ltd.
    Inventors: Toshiyata Tezuka, Hiroshi Kawakami, Katsutoshi Miura
  • Patent number: 3938077
    Abstract: An alarm device for informing reduction of pneumatic pressure of tires comprises a group of oscillators each consisting of an oscillator circuit, an electric power supply source thereof, a switch for closing an electric power supply circuit when the internal pressure of the tire is lowered to less than a prescribed value and radiation antenna, a group of receiver tuning circuits having a receiver antenna, a sweep generator, a comparison circuit for generating the gate control signal, a gate circuit for sequentially gating the output of a ratio detection circuit, pulse noise elimination circuits consisting of monostable circuits and smoothing filters, comparators for comparing the smoothed DC signal with reference signals which discriminate the operation of an oscillator, and alarm devices for generating alarm information.
    Type: Grant
    Filed: November 25, 1974
    Date of Patent: February 10, 1976
    Assignee: Bridgestone Tire Company, Ltd.
    Inventors: Kenzo Nakanishi, Yasuaki Hanasaka
  • Patent number: 3935892
    Abstract: A pneumatic tired wheel having excellent highspeed performance after puncture comprises a tubeless tire, a bead stopper and a rim. The tubeless tire comprises a pair of elastic reinforcements having a Shore A hardness of at least 47, the bead stopper comprises an independent air-tight chamber and a crown portion with at least one inextensible reinforcing layer. The crown portion has an outer diameter determined in connection with the outer diameters of the flange of the rim and the tread portion of the tire.
    Type: Grant
    Filed: June 19, 1974
    Date of Patent: February 3, 1976
    Assignee: Bridgestone Tire Company, Ltd.
    Inventors: Iwao Arimura, Yasuo Suzuki, Akira Matsuda, Akio Sato
  • Patent number: D277562
    Type: Grant
    Filed: June 23, 1982
    Date of Patent: February 12, 1985
    Assignee: Bridgestone Tire Company, Ltd.
    Inventors: Junichi Kawajiri, Toshio Hayakawa, Hideaki Nishio