Abstract: Provided are a mold allowing smooth removal of a molded article therefrom without deforming the molded article, and a method of producing the molded article using the mold. The mold includes a first mold piece (A), a second mold piece (B), and a plurality of third mold pieces (C). One of the first mold piece (A) and the second mold piece (B) has a protrusion cavity surface (2f) that protrudes toward the third mold piece (C) from a mating surface (1a) to contact with the third mold piece (C) and shapes an external profile of the molded article (Ma) together with a cavity surface (3f) of the third mold piece (C) when the mold pieces are clamped with each other.

Abstract: A segmented mold operator includes a main frame fixed to an upper cavity part of a tire press cavity and a control plunger with an axially movable cylinder rod that is configured to apply a squeeze pressure to the tire press cavity. A rotatable lock ring is rotatably coupled about an end of the cylinder rod and axially movable therewith. The lock ring includes a plurality of teeth radially arranged thereon to interface with a mold ring adapter via a bayonet connection. A lock ring frame is independent from the rotatable lock ring and is separated therefrom along the cylinder rod. A locking plunger is configured to selectively engage the rotatable lock ring to thereby prevent rotation of the rotatable lock ring. An electronic lock sensor is configured to electronically sense an axial position of the lock rod.

Abstract: A correcting apparatus of a seamless belt includes a bottomed cylindrical main body that has an inner peripheral surface formed of mirror surface and that accommodates a seamless belt at a distance from the inner peripheral surface, a lid body detachably attached to the main body, a fixing unit that fixes an upper end and a lower end of the seamless belt to the mirror surface, a pressing unit that presses the seamless belt accommodated in the main body against the mirror surface, and a heating unit that heats the mirror surface.

Abstract: A mold includes at least one axial member carrying at least one sidewall molding surface for molding a sidewall of a tire, radial segments each carrying at least one surface for molding a tread of the tire and locking surfaces for connecting the axial member with the radial segments. First radial and axial locking surfaces which are displaceable and carried by the axial member cooperate with second radial and axial locking surfaces. The sidewall molding surface is integral with a fixed portion of the axial member. The first radial and axial locking surfaces are integral with at least one locking member mounted in the axial member and are movable relative to the fixed portion.

Abstract: Provided are a apparatus and a method for vulcanizing a pneumatic tire, where are capable of: smoothly releasing a vulcanized pneumatic tire from multiple sectors separated from one another in a circumferential direction in each of an upper mold and a lower mold; and thereby lightening load on each mold. In addition to springs for biasing the sectors to always move into a smaller diameter, respectively, pushpins for moving the sectors into larger and smaller diameters are actuated by the respective cylinder rods of drive cylinders, and thereby the movements of the individual sectors into the larger and smaller diameters are controlled. Accordingly, even though the sectors would otherwise move abruptly into the smaller diameter due to biasing forces of the springs after the vulcanized tire is released from the sectors at the larger diameter, a radius-reducing movement speed of the sectors is control led by the cylinder rods in contact with rear ends of the push pins.

Abstract: A mold includes at least one axial member carrying at least one sidewall molding surface for molding a sidewall of a tire, radial segments each carrying at least one surface for molding a tread of the tire and locking surfaces for connecting the axial member with the radial segments. First radial and axial locking surfaces which are displaceable and carried by the axial member cooperate with second radial and axial locking surfaces. The sidewall molding surface is integral with a fixed portion of the axial member. The first radial and axial locking surfaces are integral with at least one locking member mounted in the axial member and are movable relative to the fixed portion.

Abstract: The mold for molding a tire has the contact part 42 that contacts with the end surface in the circumferential direction of the adjacent pieces and the non-contact part 44 that does not contact with the end surface in the circumferential direction of the adjacent pieces at the end surface 40 in the circumferential direction of the piece 30 in the segments right after the mold of the cycle of the tire molding process in which the opening and closure of the mold are repeated is closed, and the non-contact part 44 is present in the inner side of the tire radial direction, the contact part 42 is present outside of the tire radial direction than the non-contact part, and right before the mold in the cycle of the tire molding process is opened, the end surface 40 in the circumferential direction of the piece 30 in the segments contacts with the end surface 40 in the circumferential direction of the adjacent pieces in the non-contact part 44.

Abstract: This invention relates to an expandable curing bladder for use in curing rubber products; the bladder comprising an inner layer and an outer layer bonded to the first layer; the inner layer comprising a rubber composition comprised of, based on parts weight per 100 parts by weight rubber (phr): an isobutylene copolymer rubber selected from butyl rubber and/or halobutyl rubber, wherein said butyl rubber comprises a copolymer of isobutylene and isoprene which contains from about 0.5 to about 5 weight percent units derived from isoprene; wherein said halobutyl rubber is a halogenated butyl rubber comprises a chlorinated or brominated copolymer of isobutylene and isoprene which contains from about 0.5 to about 5 weight percent units derived from isoprene; and the outer layer comprising a rubber composition comprising a silicon rubber.

Abstract: The tire mold comprises a laminated peripheral crown having a stack in the circumferential direction of a plurality of thin sheets. Cutouts distributed over several adjacent sheets increase the venting ability of the mold.

Abstract: The invention relates to a device for treading a vulcanized tire carcass using an uncured tread comprising a rim (6) for mounting the carcass, an elastic annular mold (7) whose circumferential outer surface is covered with an elastic sleeve (16), the mold being intended to mold the uncured tread (3), the device comprising two disc-shaped elastic flanges (8, 9) intended to cover, respectively, one sidewall of the assembly composed of the constituted tire covered with the mold (7), the larger-diameter peripheral end (82, 92) of each flange (8, 9) bearing a rigid annular member (33) for connection with the sleeve (16) covering the mold (7).

Abstract: A resilient annular or ring-shaped mold for molding a crude rubber tread covering a vulcanized tire carcass, the mold being made of a resilient material, characterized in that it has provision for limiting its diameter in compression.

Abstract: The tire mold includes a peripheral ring split into two parts (G and D). The peripheral ring is laminated. It consists of a stack in the circumferential direction of a number of thin adjacent elements (1) made, for example, of metal sheets. The elements are of two different types: standard elements and intermediate elements, which follow on from one another circumferentially. The mold includes alignment means interacting with said intermediate elements in order to impose an orientation with respect to the radial direction on said intermediate elements. These means are, for example, grooves in which the intermediate elements are engaged.

Abstract: Mold for a tire or for an annular tread member of a tire, including a mullicity of sectors moving radially and closed by the axial displacement of a crown coming to act upon the frusto-conical sector seats, and of an annular element, midway between the crown and the sector seats, intended to permit axial retraction of the crown when the internal pressure in the cavity of the mold exceeds a given threshold of pressure.

Abstract: The tire mold includes a shell for the molding of the sidewalls, said shell including a laminated assembly formed of lamelliform elements directed substantially parallel to the axis, the molding surface for said sidewall being formed by the adjacent edges of the said lamelliform elements.

Abstract: The pressure compression mould for the production and/or revulcanisation of tires forms a hollow space where the pressure and the temperature can be regulated. Each sidewall of the compression mould is designed with an elastic and flexible annular disc membrane which the sidewalls of a tire placed in the mould is made to thrust against in order to control the outwardly directed tensile forces in the tire. The membrane sides facing towards the mould hollow space is equipped with an annular disc-shaped membrane-protective plate in order to prevent direct contact between side faces of the tire and the respective membranes during the production/vulcanisation. The plate is split up, both in the radial and circular plane, into a series of smaller plates the free ends of which mutually overlap each other.

Abstract: Expandable bladders for use in curing presses for hydrocarbon rubbers, such as pneumatic tires, are a crosslinked elastomer composition comprising isobutylene repeat units and including a fluorinated ethylene polymer added in particulate form and thereafter dispersed throughout the bladder. These fluorinated ethylene polymer may or may not form fibers. The bladders may further comprise graphite. A preferred isobutylene elastomer is a brominated copolymer of from 80 to 99 weight percent isobutylene and from 1 to 20 weight percent paramethylstyrene. The bladders have enhanced lubricity, reduced adhesion to cured tire innerliners, better resistance to cracking during flexing, and have lower tension set than similar compositions without fluorinated ethylene polymers. The above enhancements allow hydrocarbon rubbers such as tires to be molded with fewer defects caused by abraded or deformed bladders. They also enhance the useful life of the bladder reducing the cost of tire curing.

Abstract: Expandable bladders for use in curing presses for hydrocarbon rubbers such as pneumatic tires are a crosslink elastomer comprising isobutylene repeat units and include graphite. A preferred isobutylene elastomer is a brominated copolymer of isobutylene and p-methylstyrene. The bladders have enhanced lubricity, low adhesion to tire innerliners, and lower hot tension set. The above enhancements allow hydrocarbon rubbers such as tires to be molded with fewer defects caused by abraded or deformed bladders. They also enhance the useful life of the bladder reducing the cost of tire curing.

Abstract: A radially expandable and contractible rim used to secure an annular elastomeric sealing ring to a tire bead during retreading of a tire.

Abstract: The peripheral ring of a sector mold for tires is formed of an assembly of plates 1 resting against each other and stacked in such a manner as to push each other back. The ring therefore has a continuous tendency to increase in diameter. This tendency is resisted, for instance, by a conical hoop which simultaneously pushes all the plates 1 radially in the molding direction.

Abstract: The present invention relates to a method of producing a precured retreaded tire, etc., and the purpose of the invention is to produce the tire with saving space and power. Here, a precured retreated tire means a tire made by linking a plate rubber member, which has been vulcanized and molded so as to form tire grooves in advance, to a circumferential surface of a buffed abraded tire without vulcanizing said plate rubber member. A producing method according to the present invention comprises a step to insert a bladder (30) into a tire (T), a step to closely connect a plate of once vulcanized rubber member (T1) to a circumferential face of a buffed tire with an unvulcanized linking rubber (R) placed therebetween by attaching an envelope (48) to an outer circumferential face of the tire with fluid pressure, and a step to vulcanize the linking rubber by a heating device (46) and integrally combine the plate rubber member to the circumferential face of the tire, in order.

Abstract: An apparatus for vulcanizing a pneumatic vehicle tire, the beads of which, in a mounted state, are disposed on the radially inner periphery of a wheel rim. A tire blank, with the beads displaced laterally outwardly, is vulcanized using a heating press that is provided with two axially displaceable contour rings for forming the inner regions of the tire beads, and a heating bellows. To facilitate introduction of the tire blank and to protect the heating bellows, it is proposed, for loading the heating press, to axially move the contour rings together, into a position above a vulcanizing position, in such a way that the evacuated heating bellows moves downwardly through a space defined by the lower contour ring. The tire blank is subsequently placed over the contour rings, accompanied by a slight oval deformation of the lower tire bead, and is subsequently fixed on the contour rings by increasing the axial spacing therebetween. At the same time, the heating bellows passes into the interior of the blank.

Abstract: Vulcanization apparatus to vulcanize, with the heat and pressure of a fluid, a molding of rubber belt material (before being cut crosswise into the final products) while the molding is being held intact over the external circumference of a hollow cylindrical mold. A steaming jacket is provided into which the mold with the molding sticking intact thereto is inserted. The steaming jacket comprises a rubber sleeve on the interior of a cylindrical casing and secured and sealed at upper and lower axial ends of the rubber sleeve against the casing. The sleeve is swelled inwardly when heated high pressure fluid is passed through an internal space between the casing and the sleeve. The vulcanization apparatus is provided with steam supply and discharge pipes for the internal space of the jacket and steam supply and discharge pipes for the mold inserted into the jacket.

Abstract: A system for curing a green tire made from elastomeric material includes a tire mold with a surface defining a cavity for shaping the tire. A plurality of vent passages communicate the cavity with the exterior of the tire mold. An inflatable bladder presses the tire against the surface defining the cavity for a predetermined time in response to fluid pressurization. A fluid pressure source pressurizes the bladder. A conduit communicates the fluid pressure source with the bladder. A restrictor member is located in the conduit for restricting the rate of increase of fluid pressure in the bladder to a predetermined rate of increase during the first one-third of the predetermined time. During the first one-third of the predetermined cure time, portions of the tire adjacent the plurality of vent passages cure and restrict the flow of other uncured portions of elastomeric material into the vent passages.

Abstract: For eliminating burrs which form on moulded, or injected products, a moulding device and, in particular, a tire-vulcanizing mould, is provided with a plastically and elastically deformable portion on the coupling surface between the corresponding elements. The coupling, between the facing surfaces, is not simultaneous, but involves a portion of surface having an amplitude that increases in its size, during the shutting movement of the mould.

Abstract: A method and apparatus whereby tire mold is closed to within approximately one inch of full closure with a green tire in place therein for molding, and the mold is then evacuated employing a vacuum conduit prior to full mold closure whereby air within the mold cavity is evacuated and the necessity for vent holes in the mold is eliminated. A mold for practice in the invention is free of vent holes in the thread, sidewall, and bead portions of the mold and includes, along the parting line, at least one vacuum conduit whereby the mold cavity may be evacuated to not more than 16932 Pa within not more than about 60 seconds employing a source of vacuum. Seals are provided radially outward of the vacuum conduit along the parting line, and, where necessary, adjacent any moveable bead ring associated with the tire mold. Seals are preferably of a type wherein a differential between pressures experienced by one seal surface and obverse seal surface cause a more effective sealing arrangement.

Abstract: An apparatus and method for cold retreading or recapping of the running surface of a vehicle tire. A rubber, rope and cloth mold larger in diameter than the recap tires produced in it is produced utilizing a new tire male mold covered with perforated polypropylene film, uncured rubber with nylon rope at its edges and highly stretchable cloth enclosed in an envelope and cured by application of pressure and heat. A larger male mold is used to make the final female mold directly, or a like-size male mold is used to make an intermediate mold which is used to produce a tread ring that is stretched to form a larger diameter male mold from which a final mold is prepared. The somewhat flexible, compressible final female mold thus produced is then utilized in recapping tires by positioning it around a prepared tire carcass coated with cement, a layer of uncured rubber, and a sheet of perforated polypropylene film.

Abstract: An apparatus for expanding an annular tire component into a ring comprising an inflatable, expandable annular pressure vessel formed by an inflatable bag or diaphragm attached to a cylindrical carrier drum and guide means for accurately controlling in a predetermined manner the axial position of the bag with respect to the carrier drum. The guide means are preferably radially extending pins sliding in bearings.

Abstract: An apparatus and method for cold retreading of the running surface of a vehicle tire. A rubber and cloth mold is produced utilizing a new tire male mold covered with perforated polyethylene film, uncured rubber and highly stretchable cloth enclosed in an envelope and cured by application of pressure and heat. The somewhat flexible female mold thus produced is then utilized in recapping tires by positioning it around a prepared tire carcass coated with cement, a layer of uncured rubber, and a sheet of perforated polyethylene film. The mold and tire assembly is then enclosed in an envelope, and like assemblies are placed in a chamber where curing of the rubber layer is accomplished by inflation of the tire carcass, evacuation of the envelope, pressurization of the chamber and application of heat.

Abstract: A body having rubber material thereon is positioned on a lower member, and an upper member is moved toward the lower member, such relative movement causing tread-forming shoes to move to inward positions to form a tread on the rubber material. As an alternative, the upper and lower members may be brought together, and rubber material may be injected into position to have a tread formed thereon. Upon movement of the upper and lower member relatively apart, the rubber material is made to remain in contact with the shoes, and the body is removed, whereupon an annular core having rubber material thereon is disposed on the lower member, and the upper and lower members are again brought together to deposit the rubber material in contact with the shoes onto the rubber material on the core.

Abstract: A body having rubber material thereon is positioned on a lower member, and an upper member is moved toward the lower member, such relative movement causing tread-forming shoes to move to inward positions to form a tread on the rubber material. As an alternative, the upper and lower members may be brought together, and rubber material may be injected into position to have a tread formed thereon. Upon movement of the upper and lower member relatively apart, the rubber material is made to remain in contact with the shoes, and the body is removed, whereupon an annular core having rubber material thereon is disposed on the lower member, and the upper and lower members are again brought together to deposit the rubber material in contact with the shoes onto the rubber material on the core.

Abstract: A mold base has an annular support plate secured thereto and formed with a plurality of equiangularly spaced radial slots and with an external peripheral guide groove. A support structure on the support plate carries an annular base plate mounting the lower half of a cylindrical radially inner chill whose upper half is carried by an annular closure plate. An arm on the base pivotally supports a radial arm pivotally connected to the closure plate, and a toggle linkage is connected between the base and the radial arm. An operating ring is guided in the guide groove for angular displacement by a hydraulic actuator. Radially outer chill sectors are positioned on the base plate and carried by respective die sectors guided in the radial slots of the support plate, and bent crank links connect the die sectors to the operating ring. The die sectors have beveled clamping surfaces engageable with beveled peripheries of the base and closure plates upon displacement of the operating ring in a mold closing direction.

Abstract: Apparatus casting for injection-molding car tires whose internal contour is determined by a core and whose external contour is established by mold shells which are, at least partially, provided with lateral shells movable in an axial direction, thereby the various regions of the tires being cast or injected in separate operations. The mold shells, in addition to lateral shells, are provided with external segments and at least two external segments of different shape are pivotedly attached to segment holders positioned around the tire being produced so that the segment holders are radially adjustable with respect to the tire under production.

Abstract: A resilient mold and a method for retreading tires using such mold which has an inner face of a normal, unstretched diameter which is smaller than the outer diameter of a tire tread. The mold is in the shape of a ring and has, on its inner side or face, an embossing pattern which applies a tread design to a vulcanizable rubber band previously applied to a tire body. The ring mold is first expanded and then fitted over the tire body and the so-applied vulcanizable band and, thereafter, the ring mold is allowed to contract responsive to its inherent tension. The ring mold, thus fitted over the tread band, is centered on the body while the tire is rotated. This whole unit is then heated to a temperature which converts the tread band into a plastic form and embosses the tread design from the ring mold onto the tread band, which is vulcanized and bonded to the tire body.

Abstract: A mold cavity for producing a pneumatic vehicular tire is radially expandable to form successive coaxial annular layers, e.g. carcass, reinforcing belt and tread, of the tire body. The mold cavity is defined by a stationary core, several outer annular mold walls alternately juxtaposable with the core, and a pair of opposite cheeks axially bracketing the core and the juxtaposed segments. The segments of each mold wall are movably mounted on a respective carrier ring and are radially outwardly retractable thereon to clear the cheeks whereby they can be axially moved into and out of alignment with the core. With successive operative positioning of segment sets of progressively increasing inner radii around the core, the mold cavity is expanded after each molding step preparatorily to formation of the next layer after partial hardening of the elastomeric material of the layer previously formed therein.

Abstract: An adjustable tire curing mold or matrix suitable for retreading tires of varying diameter. A plurality of rigid mold segments with adjacent segments joined to form a continuous annular mold of variable diameter, and means for compressing the mold segments inwardly about a tire positioned within the mold.

Abstract: A method for retreading tires using a resilient mold or matrix ring which is normally smaller than a tire body. On its inner side, this ring has an embossing pattern which applies a tread design to a vulcanizable rubber band previously attached to a tire body. The matrix ring is first expanded and then fitted over the tire body with its vulcanizable band in place. Thereafter, the matrix ring is allowed to contract responsive to its inherent tension. The matrix ring thus attached over the tread band is centered on the body while the tire rotates. This whole unit is then heated to a temperature which converts the tread band into a plastic form and embosses the tread design from the matrix ring onto the tread band, which is vulcanized and bonded to the tire body.