Patents Assigned to Bridgestone Metalpha Corporation
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Publication number: 20020037422Abstract: A method of manufacturing a metallic fiber in which from a convergent extended wire, which is formed by a metallic fiber and a matrix member which is formed of a metallic material and whose dissolvability is higher than the dissolvability of the metallic fiber, the matrix member is continuously dissolved and removed by an electrolytic processing in a plurality of electrolytic tanks which are arranged in the conveying direction of the convergent extended wire, wherein: the convergent extended wire is passed through electrolytes in the plurality of electrolytic tanks, which are arranged in the shape of a gentle convex arch at the vertical direction upper side which includes the conveying passage of the convergent extended wire, the convergent extended wire is passed above a plurality of feeding devices which are provided at the outer sides of the electrolytes and which are disposed in the same arch-shape so as to correspond to the electrolytic tanks, in each of the plurality of electrolytic tanks, the metallicType: ApplicationFiled: September 5, 2001Publication date: March 28, 2002Applicant: Bridgestone Metalpha CorporationInventors: Tadashi Takahashi, Yukio Aoike, Tatsuo Hirayama
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Patent number: 6338780Abstract: A method of manufacturing a metallic fiber in which from a convergent extended wire, which is formed by a metallic fiber and a matrix member which is formed of a metallic material and whose dissolvability is higher than the dissolvability of the metallic fiber, the matrix member is continuously dissolved and removed by an electrolytic processing in a plurality of electrolytic tanks which are arranged in the conveying direction of the convergent extended wire, wherein: the convergent extended wire is passed through electrolytes in the plurality of electrolytic tanks, which are arranged in the shape of a gentle convex arch at the vertical direction upper side which includes the conveying passage of the convergent extended wire, the convergent extended wire is passed above a plurality of feeding devices which are provided at the outer sides of the electrolytes and which are disposed in the same arch-shape so as to correspond to the electrolytic tanks, in each of the plurality of electrolytic tanks, the metallicType: GrantFiled: January 9, 2001Date of Patent: January 15, 2002Assignee: Bridgestone Metalpha CorporationInventors: Tadashi Takahashi, Yukio Aoike, Tatsuo Hirayama
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Patent number: 6325875Abstract: A metal fiber of titanium or titanium alloy has given equivalent area diameter and specific surface area and is produced by a bundle drawing method wherein mild steel is used as a material for covering layer and outer housing and a composite wire is subjected to a heat treatment at a given temperature.Type: GrantFiled: January 12, 2001Date of Patent: December 4, 2001Assignee: Bridgestone Metalpha CorporationInventor: Shuji Amamoto
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Patent number: 6316122Abstract: A metal fiber of titanium or titanium alloy has given equivalent area diameter and specific surface area and is produced by a bundle drawing method wherein mild steel is used as a material for covering layer and outer housing and a composite wire is subjected to a heat treatment at a given temperature.Type: GrantFiled: August 31, 1998Date of Patent: November 13, 2001Assignee: Bridgestone Metalpha CorporationInventor: Shuji Amamoto
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Patent number: 6270913Abstract: A method of manufacturing a metallic fiber in which from a convergent extended wire, which is formed by a metallic fiber and a matrix member which is formed of a metallic material and whose dissolvability is higher than the dissolvability of the metallic fiber, the matrix member is continuously dissolved and removed by an electrolytic processing in a plurality of electrolytic tanks which are arranged in the conveying direction of the convergent extended wire, wherein: the convergent extended wire is passed through electrolytes in the plurality of electrolytic tanks, which are arranged in the shape of a gentle convex arch at the vertical direction upper side which includes the conveying passage of the convergent extended wire, the convergent extended wire is passed above a plurality of feeding devices which are provided at the outer sides of the electrolytes and which are disposed in the same arch-shape so as to correspond to the electrolytic tanks, in each of the plurality of electrolytic tanks, the metallicType: GrantFiled: October 27, 1998Date of Patent: August 7, 2001Assignee: Bridgestone Metalpha CorporationInventors: Tadashi Takahashi, Yukio Aoike, Tatsuo Hirayama
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Publication number: 20010001286Abstract: A method of manufacturing a metallic fiber in which from a convergent extended wire, which is formed by a metallic fiber and a matrix member which is formed of a metallic material and whose dissolvability is higher than the dissolvability of the metallic fiber, the matrix member is continuously dissolved and removed by an electrolytic processing in a plurality of electrolytic tanks which are arranged in the conveying direction of the convergent extended wire, wherein: the convergent extended wire is passed through electrolytes in the plurality of electrolytic tanks, which are arranged in the shape of a gentle convex arch at the vertical direction upper side which includes the conveying passage of the convergent extended wire, the convergent extended wire is passed above a plurality of feeding devices which are provided at the outer sides of the electrolytes and which are disposed in the same arch-shape so as to correspond to the electrolytic tanks, in each of the plurality of electrolytic tanks, the metallicType: ApplicationFiled: January 9, 2001Publication date: May 17, 2001Applicant: BRIDGESTONE METALPHA CORPORATIONInventors: Tadashi Takahashi, Yukio Aoike, Tatsuo Hirayama
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Patent number: 6102095Abstract: A corrosion resistant steel cord for reinforcing rubber articles, particularly a belt and/or carcass of a pneumatic tire, has a residual compressive stress inside the twisting helix of each steel filament such that a ratio R.sub.1 /R.sub.0 is less than one, where R.sub.0 is the radius of curvature of a helix in each helically formed steel filament obtained by untwisting of the cord and R.sub.1 is the radius of curvature of the helix after removal of a surface layer from the inside of the helix in the steel filament. The steel filaments have a tensile strength of 4,000-4,800 N/mm.sup.2.Type: GrantFiled: November 24, 1997Date of Patent: August 15, 2000Assignees: Bridgestone Corporation, Bridgestone Metalpha CorporationInventors: Naohiko Obana, Yoshikazu Kaneko, Ryuzo Osawa
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Patent number: 5873962Abstract: A steel cord intended for use to reinforce rubber products is produced by drawing, into a steel filament of 0.10 to 0.40 mm in diameter and more than 3,000 N/mm.sup.2 in strength, a wire rod having a carbon content of more than 0.70% by weight, and twisting a plurality of such steel filaments together. Also a pneumatic tire is provided which employs in at least a portion of a reinforcing member thereof the steel cord improved in corrosion resistance and having an R.sub.1 /R.sub.0 ratio .times.100 which is less than 100, where R.sub.0 is the radius of spiral curvature of the spiraled steel filament resulting from untwisting said steel cord and R.sub.1 is the radius of spiral curvature of said steel filament of which the surface layer inside the spiral is removed by dissolving.Type: GrantFiled: December 19, 1996Date of Patent: February 23, 1999Assignee: Bridgestone Metalpha CorporationInventors: Yoshikazu Kaneko, Naohiko Obana
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Patent number: 5858200Abstract: A method of manufacturing a metallic fiber in which from a convergent extended wire, which is formed by a metallic fiber and a matrix member which is formed of a metallic material and whose dissolvability is higher than the dissolvability of the metallic fiber, the matrix member is continuously dissolved and removed by an electrolytic processing in a plurality of electrolytic tanks which are arranged in the conveying direction of the convergent extended wire, wherein: the convergent extended wire is passed through electrolytes in the plurality of electrolytic tanks, which are arranged in the shape of a gentle convex arch at the vertical direction upper side which includes the conveying passage of the convergent extended wire, the convergent extended wire is passed above a plurality of feeding devices which are provided at the outer sides of the electrolytes and which are disposed in the same arch-shape so as to correspond to the electrolytic tanks, in each of the plurality of electrolytic tanks, the metallicType: GrantFiled: May 23, 1997Date of Patent: January 12, 1999Assignee: Bridgestone Metalpha CorporationInventors: Tadashi Takahashi, Yukio Aoike, Tatsuo Hirayama
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Patent number: 5822973Abstract: A steel cord intended for use to reinforce rubber products is produced by drawing, into a steel filament of 0.10 to 0.40 mm in diameter and more than 3,000 N/mm.sup.2 in strength, a wire rod having a carbon content of more than 0.70% by weight, and twisting a plurality of such steel filaments together. Also a pneumatic tire is provided which employs in at least a portion of a reinforcing member thereof the steel cord improved in corrosion resistance and having an R.sub.1 /R.sub.0 ratio.times.100 which is less than 100, where R.sub.0 is the radius of spiral curvature of the spiraled steel filament resulting from untwisting said steel cord and R.sub.1 is the radius of spiral curvature of said steel filament of which the surface layer inside the spiral is removed by dissolving.Type: GrantFiled: October 6, 1997Date of Patent: October 20, 1998Assignee: Bridgestone Metalpha CorporationInventors: Yoshikazu Kaneko, Naohiko Obana
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Patent number: 5806296Abstract: A steel cord intended for use to reinforce rubber products is produced by drawing, into a steel filament of 0.10 to 0.40 mm in diameter and more than 3,000 N/mm.sup.2 in strength, a wire rod having a carbon content of more than 0.70% by weight, and twisting a plurality of such steel filaments together. Also a pneumatic tire is provided which employs in at least a portion of a reinforcing member thereof the steel cord improved in corrosion resistance and having an R.sub.1 /R.sub.0 ration.times.100 which is less than 100, where R.sub.0 is the radius of spiral curvature of the spiraled steel filament resulting from untwisting said steel cord and R.sub.1 is the radius of spiral curvature of said steel filament of which the surface layer inside the spiral is removed by dissolving.Type: GrantFiled: May 23, 1996Date of Patent: September 15, 1998Assignee: Bridgestone Metalpha CorporationInventors: Yoshikazu Kaneko, Naohiko Obana
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Patent number: 5709073Abstract: A steel cord for the reinforcement of rubber articles exhibits largely different bending rigidities in two crossing directions at section of the cord and comprises a bundle of plural strands each being obtained by twisting 3 or more steel filaments and a wrapping filament helically wound around the bundle. The steel filaments have a twisting pitch in the range of 3.0 to 30.0 mm. A single wrapping filament is helically wound around the bundle at a twisting pitch of 2.0-15 mm. Various cord structures may be used, for example, 1.times.3, 1.times.5, 2+6 and 3.times.4.Type: GrantFiled: September 13, 1996Date of Patent: January 20, 1998Assignee: Bridgestone Metalpha CorporationInventors: Shuichi Onuma, Naohiko Obana, Kazuto Fujita, Motonori Bundo
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Patent number: 5706641Abstract: A steel cord which is suitable for reinforcing a rubber product and has excellent fatigue resistance. The steel cord has a layer-twisted structure formed by steel filaments respectively having a diameter of 0.15 mm to 0.25 mm. A core of the steel cord is formed by 1 to 4 steel filaments. A least 6 steel filaments are wound around the steel filaments of the core to form at least one layer. When the steel cord is bent from a straight state to a state in which a radius of curvature thereof is d/(17.times.10.sup.-3) wherein d is a diameter in millimeters of each steel filament in an outermost layer of the steel cord, a maximum amount of movement of each steel filament in the outermost layer in a cross-section of the steel cord is less than or equal to (-0.5454d+0.1454).times.10.sup.3 um. The steel cord preferably has a two-layer-twisted structure or a three-layer-twisted structure, and has an arrangement in which the diameters of the steel filaments gradually decrease from the core to the outermost layer.Type: GrantFiled: November 14, 1995Date of Patent: January 13, 1998Assignee: Bridgestone Metalpha CorporationInventor: Hiroki Ishizaka
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Patent number: 5677088Abstract: An improved nickel electrode plate for an alkaline storage battery in which a paste-like active material is filled. The plate has a porous structure comprising one non-woven fabric or two or more such fabrics made of metal fibers each having a diameter of 10 .mu.m or more and a length of at least 10 mm and a framework made of nickel wires each thicker than the metal fiber to support the non-woven fabric or fabrics. The metal-fiber non-woven fabric or fabrics and nickel wires are sintered together to form the porous structure.Type: GrantFiled: November 30, 1995Date of Patent: October 14, 1997Assignee: Bridgestone Metalpha CorporationInventor: Tatsuo Kobayashi
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Patent number: 5669577Abstract: An air cylinder is actuated to remove a winding reel from a winding shaft. When a piston rod is driven to advance in an axial direction of the winding shaft toward a transmission rod and abuts and presses against a pressure-applied end portion of the transmission rod against a first coil spring, the piston rod receives reactive force from the pressure-applied end portion. On receiving reactive force, the air cylinder moves back in an axial direction of the winding shaft, which is opposite to that in which the piston rod advances, on a linear guide against a second coil spring and a pawl piece abuts against and engages with a flange. After the pawl piece and the flange have engaged with each other, the air cylinder is prevented from moving back in the axial direction still further. Pressing force of the piston rod onto the pressure-applied end portion of the transmission rod when a diameter of a collet sleeve is reduced acts on the pawl piece via the flange and then does not act on a bearing as thrust load.Type: GrantFiled: August 1, 1995Date of Patent: September 23, 1997Assignee: Bridgestone Metalpha CorporationInventor: Masamitsu Nagashima
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Patent number: 5651246Abstract: A method for producing a steel cord from 3 to 6 steel filaments on which a coating is applied to retain the adhesion to a rubber, the steel cord being destined for use to reinforce a rubber product having a flat section, comprising the following steps of preforming steel filaments at a ratio of more than 120% by twisting them together to form an open-structure steel cord; and passing the steel cord through a flattening apparatus provided at each of outlet and inlet thereof with a roller having a groove formed in the center of the circumference thereof, and between the inlet and outlet rollers with at least a roller of which the circumferential surface is flat, to repeatedly bend the steel cord vertically or horizontally.Type: GrantFiled: October 15, 1996Date of Patent: July 29, 1997Assignee: Bridgestone Metalpha CorporationInventor: Noboru Kusaba
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Patent number: 5605036Abstract: A steel cord for the reinforcement of rubber articles exhibits largely different bending rigidities in two crossing directions at section of the cord and comprises a bundle of plural strands each being obtained by twisting 3 or more steel filaments and a wrapping filament helically wound around the bundle.Type: GrantFiled: December 20, 1994Date of Patent: February 25, 1997Assignee: Bridgestone Metalpha CorporationInventors: Shuichi Onuma, Naohiko Obana, Kazuto Fujita, Motonori Bundo
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Patent number: 5586733Abstract: A metallic-filament take-up reel by which a metallic filament wound on a winding drum is retained inside at least one of flanges thereof.Type: GrantFiled: July 19, 1995Date of Patent: December 24, 1996Assignee: Bridgestone Metalpha CorporationInventors: Yoshihiro Miura, Masami Goto
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Patent number: 5561974Abstract: A steel cord for the reinforcement of rubber articles has a three-layer twisting structure comprising a core of 2 steel filaments, a middle sheath layer of 6 steel filaments and an outer sheath layer of 11 steel filaments, in which a ratio of filament diameter ds in the middle and outer sheath layers to filament diameter dc in the core (ds/dc) is within a range of 1.15-1.5 and a twisting pitch of the core is not less than 20 mm, and is used as a reinforcing member in a heavy duty pneumatic radial tire, conveyor belt and the like.Type: GrantFiled: November 22, 1994Date of Patent: October 8, 1996Assignees: Bridgestone Corporation, Bridgestone Metalpha CorporationInventors: Takaya Yamanaka, Eiji Kudo