| Belt for use in forming a core for manufacturing an elastomeric tire -> Monitor Keywords |
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Belt for use in forming a core for manufacturing an elastomeric tireBelt for use in forming a core for manufacturing an elastomeric tire description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070287347, Belt for use in forming a core for manufacturing an elastomeric tire. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF INVENTION [0001]1. Field of The Invention [0002]This invention pertains to an inelastic belt that is for fitting onto a tire core build mandrel whereon a core of plies and beads has been installed, with the belt formed from a pair of woven belt sections that are installed over one another, with the belt section ends joined together at spaced intervals around the mandrel of approximately one hundred eighty degrees, and with the formed belt providing a desired crossing angle of it inelastic belt warp cords or filaments. [0003]2. Prior Art [0004]The present invention is in a belt for installation over a plies and beads as have been installed onto a tire core build mandrel, with the mandrel mounting the core for fitting into a mold cavity for receiving a flow of an elastomeric material, preferably a polyurethane, encapsulating the core in a formed tire. The belt is formed by overlaying two woven belt sections where each belt section is has a warp of Rayon cords or filaments and includes cotton cords or filaments as the weave fill, and the one belt section has been turned one hundred eighty degrees around its longitudinal axis with respect to the other, and joined belt section ends are spaced approximately one hundred and eighty degrees from one another around the tire core mandrel top or crown surface. The belt sections each have Rayon warp cords that are inelastic and are set at an angle of from twenty four (24) to twenty six (26) degrees to the parallel belt edges, and which cotton fill cords or filaments of the weave aid in providing for holding the Rayon warp cords in position with the warp cords maintained straight and parallel to one another. In practice, two belt sections are laid over one another as the single belt with the Rayon warp cords or filaments having a crossing angle of from forty- eight (48) to fifty- two (52) degrees. In which positioning, the cotton fill cords or filaments aid in maintaining the positioning of the Rayon warp cords or filaments and separate the layers of warp cords or filaments. The belt sections are each formed to have a length to encircle the tire core build mandrel, above a plies sleeve fitted thereon, and the belt section ends each have like opposing angles to fit closely together, with the belt section joined ends spaced approximately one hundred eighty degrees from one another, around the tire core build mandrel top or crown surface. With the single or additional belts encircling the tire core build mandrel, a tire cord is wrapped continuously therearound, completing the assembly of the tire core that can then be fitted into mold cavity to receive a flow of an elastomeric material, preferably a polyurethane material, that encapsulates the core, completing the tire. Which preferred polyurethane material is absorbed into the surfaces of the Rayon warp and cotton cords or filaments and provides a mechanical bond thereto. [0005]A plies sleeve with beads and a Rayon warp cord or filament belt or belts is shown and described in pending patent applications for spin casting and vacuum forming tires of one of the present inventors, as set out in U.S. patent applications entitled: "Improved Method and Apparatus for Forming a Core of Plies, Belts and Beads and for Positioning the Core in a Mold for Forming an Elastomeric Tire", Ser. No. 10/909,807, filed Aug. 2, 2004; and a "Method and Apparatus for Vacuum Forming an Elastomeric Tire", Ser. No. 10/936,635, filed Sep. 4, 2004. Which patent applications demonstrate a utilization of a plies sleeve and shows a Rayon cord or filament belt formed on the upper surface of that plies sleeve, across a top or tread area of a tire core build mandrel [0006]A formation of a tire belt is shown in an earlier U.S. patent application by one of the present inventors entitled, "Method and Apparatus for Forming a Core of Plies, Belts and Beads and for Positioning the Core in a Mold for Forming an Elastomeric Tire", Ser. No. 10/909,807, filed Aug. 2, 2004. In which tire belt formation, a Rayon cord or filament is laced back and forth between spaced offset teeth of gear plates, with the cord forming an angle of approximately twenty four (24) degrees to the belt sides. In which belt formation, sections of cotton matt material were fitted between the plies surface, and between belt sections and belts and a final section of thin cotton material was installed onto of a final belt in forming the tire core. Whereas, with the invention, a need for installing sections of cotton material, or like separators between the plies, belt sections and belts is not needed. SUMMARY OF THE INVENTION [0007]It is a principal object of the present invention to provide a tire belt formed from two belt sections that are stacked to form a single belt after one of the belt sections has been rotated one hundred eighty (180) around its longitudinal axis to the other, and the belt section ends are joined across from one another, forming a continuous belt around a tire core build mandrel top or crown surface that a tire plies has been mounted on. [0008]Another object of the present invention is to provide a tire belt that is a weave of Rayon warp cords or filaments and cotton fill cords or filaments where the rectangular weave is held together by the cotton fill cords or filaments when belt sections are cut on a bias beneath an adhesive layer where the warp cords or filaments are at angles of from twenty four (24) to twenty six (26) degrees to the belt section cut edges, and the distance across the belt section is that of the width of a tire core build mandrel top or crown surface. [0009]Another object of the present invention is to provide a tire belt formed from a pair of belt sections where the one belt section is rotated one hundred eighty (180) degrees around its longitudinal axis the other such that the warp cord or filament angle of the two belt sections combine to a warp cord or filament crossing angle of from forty eight (48) to fifty two (52) degrees. [0010]Another object of the present invention is to provide a tire belt that does not require a use of spacing layers between the belt sections, belts or above or below a tire belt. [0011]Still another object of the present invention is to provide a tire belt formed from a pair of belt sections that are cut or otherwise formed from sections of a weave of Rayon warp and cotton cords or filaments, where the cuts are treated with an adhesive layer and are on a bias angle to the weave such that the warp cords or filaments are at an angle of from twenty four (24) to twenty six (26) degrees to the belt section sides. [0012]Still another object of the present invention is to provide a tire belt formed from a pair of like belt sections where the one belt section is rotated one hundred eighty (180) degrees about its longitudinal axis to the other belt section, where the respective Rayon warp and cotton fill cords or filaments each have a diameter that is selected to allow for a desired spacing distance between the Rayon warp cords or filaments when the belt sections are stacked, and between a plies layer below the belt and between the belt top surface and a wound layer of tire cord. [0013]Still another object of the present invention is to provide a tire belt formed from belt sections cut from a woven section with the cut edges receiving an adhesive, such as a starch based adhesive, applied thereto, with the belt section to have a length to close around a mandrel top or crown surface, above a plies layer, and where the belt section ends are formed with like opposing angles to fit together, forming a continuous belt section, with two overlaying belt sections having their contacting ends spaced approximately one hundred eighty degrees apart around the mandrel top or crown surface, forming a single belt, and including an arrangement for holding which belt section ends together. [0014]Still another object of the present invention is to provide a belt system where a belt is formed by overlaying two like belt sections, where the one belt section has been rotated one hundred eighty degrees relative to the other around the belt section longitudinal axis, and the warp and fill cords or filaments that form the belt section weave are Rayon and cotton cords or filaments, respectively, that provide for a strong surface bonding with a polyurethane mixture as is preferably used to form a tire containing the belt, providing a mechanical lock between the cords or filaments surfaces and the cured polyurethane material. [0015]The present invention is in a belt system for installation around a top or crown surface of a tire core build mandrel that a core of plies and beads have been mounted on, forming a core of plies beads and belts that is encapsulated in an elastomeric tire formed by casting, molding, vacuum forming or like methods. The belt or belts of the invention are fitted and maintained around the top or crown surface of the tire core build mandrel, and receives a winding of tire cord wound around the mounted belt as a final step informing a tire core that is for mounting in a mold wherein an elastomeric material, preferably a polyurethane material, is introduced during the tire molding, casting or vacuum forming process. The belt sections of the invention are each formed from a section of woven material that has a selected width to allow cutting or otherwise forming individual belt sections where the width across each belt section is the width of the top or crown of the tire core build mandrel with a plies sleeve fitted thereon. Additionally, the belt section is cut or otherwise formed from the section of woven material to where its warp cords or filaments present like angles of twenty four (24) to twenty six (26) degrees to the belt section sides, and with the fill cords or filaments assisting in maintaining the warp cords or filaments together after the section of woven material is cut or formed into belt section. Additionally, the cut belt section edges are preferably treated with an application of an adhesive to eliminate a possibility of the belt section cut section edges unraveling. Each of which belt sections is formed to have a length to fit around the tire core build mandrel mounting the plies sleeve, and the belt section ends are formed to have like opposing angles that, when fitted and maintained together, form a continuous belt that encircles the tire core build mandrel top or crown surface, above a plies sleeve. A second belt section that is like the first belt section but may be slightly longer and narrower, and is rotated one hundred eighty (180) degrees around its longitudinal axis, is installed on top of the first belt section, forming a belt that has a crossing angle of the warp cords of filaments of from forty eight (48) to fifty two (52) degrees. [0016]The invention provides woven belt sections for assembly in pairs into a continuous belt that fits snugly around a top or crown surface of a tire core build mandrel whereon a plies sleeve has been mounted. The individual belt sections are formed from a weave of Rayon warp and cotton cords or filaments where the Rayon warp cords or filaments preferably have a diameter of from point zero two five (0.025) to zero three five (0.0350 inches and the cotton fill cords preferably have a diameter of from point zero zero eight (0.008) to point zero two zero (0.020) inches, and the preferred weave has a weave density of from ten (10) to eighteen (18) Rayon warp cords per inch and four (4) to fourteen (14) cotton fill cords per inch. In practice, a weave known as a single layer plain weave is preferred to form the woven section where the cotton cords of filaments and will aid in maintaining the Rayon warp cords or filaments in a straight parallel attitude to one another and at a desired spacing distance when belts sections are stacked. Before which belt section stacking, and preferably before or during belt section cutting, the belt section sides are stabilized, as by application of an adhesive, such as a starch based adhesive, that is applied there along, holding the Rayon warp cords or filaments together, with the Rayon warp cords maintained at an angle of from twenty four (24) to twenty six (26) degrees to the belt sections sides. [0017]In practice the selection of the particularly of the Rayon warp and cotton fill cords or filaments, and their preferred arrangement in cords or filaments per inch, provides finished belt sections that, when stacked together and onto a plies sleeve surface, create a required spacing distance between the Rayon warp cords or filaments in the belt section and between the belt sections to allow for a free passage of a polyurethane material flow therethrough, encasing the tire core, in the tire formation process. Accordingly, where earlier arrangements of plies sleeve, belts and belt cord wrap have required the inclusion of spacing layers, such as sections of thin cotton material, a spacing layer or layers are not required with the belt arrangement of the present invention. With the present invention, the tire core assembly is simplified in that, to form a belt, a pair of belt sections are individually positioned over one another without a need for a separate spacing layer arranged therebetween, and are positioned around a tire core build mandrel top or tread surface, directly onto a plies sleeve earlier fitted thereto. The belt sections ends are fitted and maintained together, with the Rayon warp filaments essential straight and tight, and spacing is provided between the belt sections. Thereafter, a second belt can be fitted over a first, as needed, and the assembly is then wound with a continuous tire cord, completing a formation of a tire core for installation in a mold to form an elastomeric tire. DESCRIPTION OF THE DRAWINGS [0018]The invention may take physical form in certain parts and arrangement of parts, used to form the belt of the invention that is herein shown as a preferred embodiment and will be described in detail in this specification and illustrated in the accompanying drawings which form a part hereof: [0019]FIG. 1 shows a top plan view of a woven section of material that is a weave of Rayon warp and cotton fill cords or filaments and is shown as being cut or separated with a round blade that travels along broken lines A, behind an application of a layer of an adhesive, shown as a brush, that is in contact with the belt sections , with the formed belt sections ends at the sides of the woven section shown as having like opposing angles with each belt section for joining into a continuous belts section; [0020]FIG. 2 shows an enlarged side elevation view of a section of a belt section showing the separate parallel Rayon warp cords or filaments and a continuous cotton fill cords or filaments of the invention as having received an application of an adhesive, as shown in FIG. 1; [0021]FIG. 3 is an end elevation view of the enlarged side elevation view of the section of a belt section shown in FIG. 2: Continue reading about Belt for use in forming a core for manufacturing an elastomeric tire... 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