Abstract: A sealing ring having at least one jacket face serving as a slide surface is produced of fibers and sliding agent that are passed to one another, with the fibers being relatively short fibers.

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 high temperature seal, particularly suitable for use in vehicle engine exhaust systems, is formed of a composite structure including refractory sheet material and wire mesh. In a typical application, the seal is disposed between confronting ends of an engine exhaust manifold pipe and an exhaust tail pipe, and permits relative rotation of the pipes without impairment of the effectiveness of the seal, thereby preventing leakage of high temperature exhaust gases passing through the joined pipes.

Abstract: Injection molding a tread on an annular tire casing (44) positioned in a mold (10') by introducing a fluid molding compound (76',78') at high pressures and high temperatures into a tread molding space (105) through runner passages (114) extending from an edge (116) to a centerplane (20'--20') of the mold (10') and having gates (118) opening into the tread molding space (105). Alternatively the runner passages (56,58) may be defined by annular runner surfaces (60,62,64,66) in communication with the tread molding space (48) through annular gates (52,54). The fluid molding compound (76,78) may be ejected from annular transfer recesses (68,70) in the mold (10) by squeeze rings (84,86) movable into the transfer recesses (68,70) to introduce the fluid molding compound (76,78) into the runner passages (56,58).

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: 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 elastomeric bladder for dividing a pressure vessel into two chambers is formed in one piece and carries integrally at least one rigid element (18 or 19). A tubular blank bladder 10A of raw elastomer is shaped in a mould by fluid pressure applied to the interior of the blank while the rigid elements 18, 19 are clamped against the ends E1, E2 of the bladder valve and a vulcanization is performed whereby the rigid elements 18, 19 are bonded to the bladder.

Abstract: An apparatus and method for vulcanizing a tire using a pair of split dies which form a tire receiving space between them when the dies are closed. The dies include sealing surfaces within the space and adjacent the axially outer surfaces of the tire beads. The apparatus is mounted within the space and within the inner diameter of the tire, and includes holding means which are radially movable into and out of engagement with the tire beads. The apparatus further includes extruding means which operate in association with the movement of the dies when opening and closing, for moving the holding means toward and away from the tire beads. When the dies are closed, the extruding means move the holding means to press the beads tightly against the sealing surfaces. The interior of the tire is then directly heated and pressurized.

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: A process for making a radial tire comprises steps of transforming a cylindrical tire carcass assembly into a toroidal shape, laying over a given number of belts, winding a plurality of synthetic fiber threads, laying over a tread cap, transforming the tire carcass assembly to such an extent that the upper surface thereof contacts substantially all over the lower surface of the belts, joining integrally these tire components to form a green tire, and subjecting the green tire to vulcanization in a vulcanizing mold.The synthetic fiber threads are wound over the belts in the circumferential direction with a space of 5 mm to 15 mm left between each adjacent thread in the range of more than 70% of the width of the belts.

Abstract: A composite gasket includes two spaced rings of refractory sheet material and a ring of knitted wire mesh. The knitted wire mesh extends into the space between the refractory rings and radially outward from the outside diameter of the refractory rings.

Abstract: A radial tire having an annular cavity is built with precision and positioned between the upper and lower mold sections of a tire press. An upper center mechanism has an inflatable clamping bladder for gripping the upper bead of the tire which is suspended from the center mechanism to insure orientation of the tire components in substantially the built condition of the tire. The upper center mechanism including the upper bead ring and clamping bladder is lowered to grip and center the upper bead on the upper bead ring. The lower bead is positioned over the lower bead ring and sealing air may be utilized to provide the necessary centering and seating. The sealing air in the tire cavity is maintained at a pressure sufficient to hold the beads in seating engagement with the bead rings while the curing bladder is being inserted in the tire cavity and while the clamping bladder is deflated and retracted with the center support assembly from the tire cavity.

Abstract: The annular tread belt body is assembled of uncured resilient material having reinforcing cords and is then mounted on a precured tire casing. The read belt body is assembled with a predetermined configuration at a radially inner surface and the precured tire casing has a matching predetermined configuration on the radially outer surface for mounting of the tread belt in a centered position on the tire casing. The tread belt body and precured tire casing are enclosed in a segmental mold where the tread belt is cured. After removal from the mold, the tread belt is separated from the tire casing. The tread belt is then mounted on the radially outer surface of a tire having reinforcing cords positioned in a generally radial direction relative to the axis of the tire.

Abstract: An improved bicycle tire which can be folded for storage and transportation while maintaining the same running properties as a conventional tire. A plurality of bead cores made of a cord tensile member embedded in the bead section of the tire are provided by winding three to five turns of a cord tensile member having a low elongation ratio and high strength and which has been twisted one to two turns/10 cm in such a manner that the start and finish ends of the bead core overlap one another by 60 to 150 mm. The bead core preferably has a cut elongation of 5% or less and the strength of 300 kg/core.

Abstract: A method and apparatus for curing tires in a press without a bladder or clamps including apparatus to convert bladder presses to bladderless, clampless operation.

Abstract: In order that the stresses upon travel will be as small as possible in the region of the shoulders of a tire, it is molded between a mold and a core which together define a central zone and two lateral zones and, in each of the latter two, the median line of the sidewalls has a point of inversion of curvature located at a distance from the crown of the tire which is greater than the distance of the point of inversion of curvature of the median line of the sidewalls of the tire when mounted on its rim.

Abstract: An improved pneumatic tire and improved method for building same on a high crown building drum. The lower bead portion of the tire is provided with an additional reinforcing ply structure which is wrapped about a substantially inextensible bead wire.An improved method of building a tire on a high crown building drum wherein the additional reinforcing ply structure in the bead area is placed in tension during vulcanization.

Abstract: Inner tubes for pneumatic tires including a toric cushion made from an elastomer material having cells independent of each other.A process for manufacturing such inner tubes with a mold for preforming and vulcanizing semi-toric elements, the mold includes fingers for molding recessed cavities and an incorporated heating network, the preformed semi-toric elements having undergone a first vulcanization are then joined together and subjected to a second vulcanization in an appropriate apparatus.

Abstract: A method for manufacturing a cycle or auto-cycle wheel rim includes employing a tubular braided fibre glass sleeve which is inflated internally so as to conform its shape to the inside of a mould. An inflatable sleeve is placed inside the braided glass fibre sleeve. An appropriate length of the assembly formed by the two concentric sleeves is placed in a mould which has the shape of the wheel rim to be formed and which has plastics material injection channels and at least one air inlet channel emerging inside the inflatable sleeve. The inflatable sleeve is inflated through the air inlet channel. Plastics material in injected into the mould between the inflated sleeve and the braided fibre glass sleeve. The mold is baked for setting the structure obtained, and the wheel rim thus is then stripped from the mould.

Abstract: A tire having a reinforcing sheet of tubular knit material stretchable during shaping into a toroidal form. The knit material provides openings for striking through of the liquid reaction mixture of elastomer forming material used in molding the tire. The sheet of knit material may be folded over spaced-apart bead rings and overlapped to provide multiple layers. The tire is molded on a core supporting the reinforcing sheet and bead rings with the strands of the knit material straightened out and in tension at the time of cure.

Abstract: A cast or injection molded tire having a reinforcing sheet of netting material providing openings for striking through of elastomeric material during filling of the mold. The process of making the tire includes shaping the sheet of netting material by stretching and thereby orienting the strands. The shaping is done at elevated temperatures and then the netting material cooled in the shaped form. A mat of overlapping sheets of netting material may be used with the strands being multidirectional to provide uniform sidewall strength. An overlapping breaker ply of netting material may also be used to connect two mats of reinforcing sheets on opposite sides of the tire.

Abstract: A tire having a pair of bead portions for mounting on a rim, a tread portion radially outward of said bead portions and connecting sidewalls is cast and cured from different liquid elastomer forming materials in a three-stage process. First, the inner layer of the tire is molded of high modulus material on a collapsible core in a mold with an outer shell. Second, the first outer shell is removed and a second outer shell of a second mold is mounted around the core and cast inner layer. The tread portion of the tire is then molded by centrifugal casting from a low modulus material. Third, the sidewalls are molded of low modulus, optionally microcellular, material by injection of the liquid elastomer forming material into the sidewall spaces between the molded inner layer and the second outer shell.

Abstract: This disclosure includes a novel method of and apparatus for utilizing dry pulverulent heated material for curing a tire by positioning a tire encased in a pervious cover within a chamber, filling the chamber with dry pulverulent heated material, utilizing adjustable heating panels in exterior surrounding relationship to the pulverulent material within the chamber to heat the pulverulent material and thus cure the tire, and providing a circulation system for the pulverulent material for feeding the same into and removing the same from the chamber.

Abstract: A tire curing press and method are characterized by a center mechanism operative first to center the top bead of a green tire carcass with respect to the top mold section and then the bottom bead with respect to the bottom mold section, and to hold the beads centered and axially separated as the press closes to cause the beads to register and seat with the toe rings of the top and bottom mold sections simultaneously as the press closely approaches its closed condition. The center mechanism comprises top and bottom segmented annular clamping rings adapted to engage and shape the axial interior of the bead area of the tire and respective chuck assemblies including a multi-faceted linear cam and respective followers for each ring segment operative to collapse each alternate ring segment and then each other ring segment. The clamping rings achieve automatic loading, centering and unloading and may be used individually or paired in bladder or bladderless curing.

Abstract: Disclosed is a method for making a hollow plastic article having a separate full ring-shaped member bonded to the article within the blow mold, and the article so made.