With Specified Procedure For Bead, Carcass Or Sidewall Formation Patents (Class 156/130.7)
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Patent number: 6461460Abstract: A process for the manufacture of a tire the beads of which are without anchoring bead wires and are reinforced by complexes of layers of reinforcement elements of low angle, around which complexes the radial carcass reinforcement is anchored by winding, said process being characterized in that each complex is produced independently of the carcass reinforcement blank, the manufacture of said complex including using at least one raw blank of reinforcement elements which are oriented at a higher angle than the angle to be obtained in the vulcanized state, subjecting said ply to pre-extension before formation of a two-layer sleeve, the pitch, angle and width characteristics of which are obtained by pantograph effect upon a second extension.Type: GrantFiled: April 11, 2001Date of Patent: October 8, 2002Assignee: Michelin Recherche et Technique S.A.Inventors: Michel Ahouanto, Luc Bestgen
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Publication number: 20020117251Abstract: A thread 4, intended to form a carcass reinforcement for a tire, is laid in contiguous hoops on a rigid core 1 by a system with a single oscillating arm transporting an orifice 6 so as to enable the orifice 6 to pass over a core 1 and come as near as possible to each bead of the tire, in order to lay adjacent hoops.Type: ApplicationFiled: January 31, 2002Publication date: August 29, 2002Applicant: Michelin Recherche et Technique S.A.Inventor: Jean-Claude Mayet
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Patent number: 6439287Abstract: Vehicular tire and process of making the same. The tire includes a carcass made of rubber, sidewalls, and tread. The carcass, in a sidewall region, includes at least one carcass ply having parallel textile reinforcements embedded in the rubber and two carcass ply ends, and the two carcass ply ends are arranged to overlap in a circumferential direction, thereby forming an overlapping point. A sidewall rubber strip is positioned to cover the carcass in the sidewall region, and a moiré pattern is formed on the sidewall rubber strip. The process includes circumferentially overlapping the two carcass ply ends of the carcass, thereby forming an overlapping region, covering the overlapping region on the outside with a sidewall rubber strip, and forming a moiré pattern on the sidewall rubber strip.Type: GrantFiled: February 17, 2000Date of Patent: August 27, 2002Assignee: Continental AktiengesellschaftInventor: Johannes Josef Baumhöfer
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Publication number: 20020104605Abstract: A motorcycle tire having excellent belt cord durability, high-speed durability, impact force absorbability, running stability and uniformity performances is produced by constituting a belt with a low-cost steel cord member having a specified twisting construction of 2 to 7 filaments and a specified space between the mutual filaments over a full length of the cord in the belt.Type: ApplicationFiled: December 6, 2001Publication date: August 8, 2002Applicant: BRIDGESTONE CORPORATIONInventors: Kiyoshi Ikehara, Sumito Nakagawa, Tsutomu Nakamura
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Publication number: 20020088529Abstract: A pneumatic tire is highly precisely and efficiently manufactured by a method wherein, during formation of a green tire, at least one constitutive member, such as a sidewall (17), is formed by radially outwardly expanding a widthwise center portion of a substantially cylindrical carcass band (13), and subsequently winding an unvulcanized rubber strip and joining the rubber strip onto an outer peripheral surface of the expanded carcass band (13).Type: ApplicationFiled: November 19, 2001Publication date: July 11, 2002Applicant: BRIDGESTONE CORPORATIONInventors: Yuichiro Ogawa, Shuhei Iizuka
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Publication number: 20020088530Abstract: A green tire holding device (10) including a frame (12), a rod (14) extending horizontally from the frame (12), and a bladder (16) mounted on the rod (14). The bladder (16) is inflatable to an inflated shape so that it contacts a substantial portion of an inner circumference of a green tire (T) to support the green tire during a pre-curing wait cycle. The green tire holding device (10) can comprise a plurality of rods (14), a plurality of bladders (16), and/or a plurality of bladders (16) on each rod (14). The bladders (16) can be inflated at substantially the same time and/or certain bladders (16) can be deflated independently of other bladders (16). In a tire manufacturing method, the loaded green tire storage device (10) is transported to a doping/curing area with the bladders (16) deflated. At the doping/curing area, the tires (T) are removed from the rods (14), doped, and re-hung on the rods (14).Type: ApplicationFiled: January 11, 2001Publication date: July 11, 2002Inventor: James M. Kirby
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Publication number: 20020074077Abstract: A method of manufacturing a pneumatic tire comprises assembling unvulcanized rubber components to make a green tire, vulcanizing the green tire, and winding an unvulcanized rubber tape so that the windings collectively have a predetermined cross sectional shape for at least one of the unvulcanized rubber components to thereby make said at least one of the unvulcanized rubber components.Type: ApplicationFiled: October 30, 2001Publication date: June 20, 2002Inventors: Ikuji Ikeda, Yoshikazu Tanaka, Naohiko Kikuchi
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Patent number: 6398893Abstract: A pneumatic tire having an excellent tire uniformity without air leakage is manufactured by laying a central innerliner, belt layers and tread rubber on an outer circumference of a shaping drum with an outer surface form being approximately the same as an inner surface form of a tire product, and laying an approximately ring-shaped sidewall assembly comprising a bead core provided with a bead filler, a side carcass layer, an outside innerliner and the like on each side face of the shaping drum without a step of expanding and deforming a green case into an approximately semi-circular form.Type: GrantFiled: March 15, 2000Date of Patent: June 4, 2002Assignee: Bridgestone CorporationInventor: Sunao Shida
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Publication number: 20020046796Abstract: A carcass ply producing apparatus for producing a carcass ply constituting a carcass layer of a tire comprisesType: ApplicationFiled: September 26, 2001Publication date: April 25, 2002Inventors: Mitsuru Hitotsuyanagi, Katsuhiro Nakatani, Kenji Nakakura, Kietsu Maeda
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Process for improving the cured adhesion of a precured rubber compound to an uncured rubber compound
Publication number: 20020046798Abstract: The present invention relates to a process for improving the cured adhesion of at least two rubber components which contact each other in a pneumatic tire. The process involves the steps of assembling and vulcanizing a pneumatic tire wherein prior to vulcanization of the pneumatic tire, one of the components is a precured rubber compound and the other is an uncured rubber compound. The process involves using a precured rubber compound comprising from 40 to 100 parts by weight of natural rubber or emulsion-polymerized styrene-butadiene copolymer rubber containing 0.5 to 3 phr of a fatty acid, precipitated silica and no fatty acid other than contained in the natural rubber or emulsion-polymerized styrene-butadiene rubber.Type: ApplicationFiled: December 4, 2000Publication date: April 25, 2002Inventor: Bruce Raymond Hahn -
Publication number: 20020040755Abstract: A method and apparatus for treading a tire carcass in which a crude rubber tread is deposited on a tire carcass to be treaded, the tire carcass thus covered having been mounted on a rim and inflated, a resilient ring-shaped mold possessing an inner annular surface ensuring molding of the tread is positioned on the tread, a resilient flange is placed between each bead and each peripheral edge of the mold and covers the outer surface of the tire casing lying between the bead and the edge, and the assembly is placed in a pressurized and heated enclosure.Type: ApplicationFiled: September 19, 2001Publication date: April 11, 2002Inventor: Francois Chamoy
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Publication number: 20020026979Abstract: A method of making a pneumatic tire with a breaker and a band, comprises: applying a raw breaker material to a cylindrical drum; spirally winding a plurality of parallel band cords around the raw breaker material on the cylindrical drum so that angles of the windings are not more than 5 degrees with respect to the tire equator; and gradually increasing one of (1) an average density of the band cords in the tire axial direction and (2) an average tension of the band cords in the tire axial direction, from a center portion of the band towards each axial edge of the band during winding the band cords.Type: ApplicationFiled: June 26, 2001Publication date: March 7, 2002Inventor: Masatoshi Tanaka
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Patent number: 6352602Abstract: A bead wire winding device is provided with a winding guide(s) (3) which is rotated with a molding support body (1), and which approachingly and retreatingly displaces with respect to each side portion of the molding support body (1). A bead wire (W) is supplied to a wire seating portion (11) of the winding guide (3) within a space defined by each winding guide (3) which is in an approached state with respect to a respective side surface of the molding support body (1), and in an enlarged diameter state. The winding guide (3) is constituted by a plurality of radially displacing members (9), which can be enlargingly and reducingly displaced in a radial direction, connected to a boss portion (7) through link members (8). Each of the radially displacing members (9) has a protrusion that forms a wire seating portion (11). A clamping claw (13) is provided on at least one of the radially displacing members (9), and is urged constantly in a closing direction and pinches a tip portion of the bead wire (W).Type: GrantFiled: March 31, 2000Date of Patent: March 5, 2002Assignee: Bridgestone CorporationInventor: Yuichiro Ogawa
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Publication number: 20010025682Abstract: A method of manufacturing a carcass structure for vehicle tyres includes preparing strip sections, each comprising longitudinal and parallel thread elements coated at least partly with at least one layer of raw elastomer material. A first series of strip sections is laid down onto a toroidal support. First primary portions of annular reinforcing structures are applied against end flaps of the first series strip sections. At least one second series of strip sections is laid down onto the toroidal support. Together, the first and second series define a first carcass ply. A third series of strip sections is laid down onto the toroidal support. Second primary portions of the annular reinforcing structures are applied against end flaps of the third series strip sections. At least one fourth series of strip sections is laid down onto the toroidal support. Together, the third and fourth series define a second carcass ply.Type: ApplicationFiled: April 30, 2001Publication date: October 4, 2001Inventor: Renato Caretta
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Publication number: 20010023737Abstract: At least one carcass ply (3) is formed by depositing a strip-like element (13) comprising longitudinal thread-like elements (13a) incorporated into a layer of elastomer material (13b), onto a toroidal support (11). Deposition of the strip-like element (13) takes place in alternated deposition sections (23, 24) each comprising two radially-extending side portions (23a, 24a, 23c, 24c) and a crown portion (23b, 24b) extending at a radially external position. The side portions of each deposition section (23, 24) are at least partly overlapped with side portions belonging to an adjacent deposition section. Associated with the carcass ply (3) are annular structures (4) comprising a circumferentially inextensible annular insert (32) axially external to an anchoring element (31). A belt structure (5), a tread band (8) and sidewalls (9) are combined with the thus formed carcass structure (2) to define a tire (1) to be submitted to a vulcanization step.Type: ApplicationFiled: June 5, 2001Publication date: September 27, 2001Applicant: PIRELLI PNEUMATICI S.p.A.Inventors: Renato Caretta, Fiorenzo Mariani
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Publication number: 20010018946Abstract: A device for the substantially vertical suspension of tire carcasses which includes a plurality of supports arranged about a lifting axis (XX′), which supports bear on the inside of a tire carcass, the supports being mobile radially relative to the lifting axis, the device further including a system having at least one spring which exerts a radial expansion force on the supports, this expansion being limited by a stop. The invention also relates to a process for building a tire in using this device.Type: ApplicationFiled: March 9, 2001Publication date: September 6, 2001Applicant: MICHELIN Recherche et Technique S.A.Inventor: Angelo Bagnasco
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Patent number: 6270606Abstract: A a carcass has at least one endless carcass cord ply, which is formed by at least one carcass cord extending zigzag in the tire's circumferential direction while being folded at both outer ends of the endless carcass cord ply alternately to right and left. The bead core has an upper bead core portion which is formed by a bead cord being substantially continuous to the carcass cord and spirally wound on the endless carcass cord ply in one or more stages in the tire's circumferential direction.Type: GrantFiled: December 18, 1998Date of Patent: August 7, 2001Assignee: Sumitomo Rubber Industries, Ltd.Inventor: Kiyoshi Ueyoko
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Patent number: 6264780Abstract: A method and an apparatus for manufacturing a bead filler which does not deteriorate the uniformity of a pneumatic tire are provided. The apparatus extrudes a rubber composition at a surface velocity V1 in a top portion 28 and at a surface velocity V2 in a base portion 26, while forming the rubber composition in the shape of a filler portion 24 in a forming portion 40 by a truncated cone shaped extruding roller 38. The filler portion 24 formed in a curved shape similar to a shape of a side portion of a tire is formed due to the difference in velocity between the surface velocities V1 and V2. The filler portion 24 is successively joined to and wound around an annular bead core from a winding start end, and is disposed in the side portion of the tire after forming the bead filler.Type: GrantFiled: August 27, 1998Date of Patent: July 24, 2001Assignee: Bridgestone CorporationInventors: Noriyuki Iwanaga, Takashi Senbokuya