Tubular material based on a fabric-reinforced resin, and a bicycle or similar vehicle frame constructed with such a material
AssigneeTechnique du Verre Tisse S.A.
InventorRegis Foret
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Abstract
A tubular material based on a fabric reinforced resin, said material comprising layed up fabric layers, the inside and outside layers consisting of bidirectional braided sheaths, said latter two layers sandwiching an intermediate, unidirectional braid consisting primarily of parallel, longitudinal yarns at least 10% of which have a high tensile strength and the remainder of which are yarns of the same type as the yarns of said bidirectional braids. An application in the construction of a bicycle frame is described.
Claims21
A tubular material comprising a plurality of superimposed layers of fabric, said plurality of superimposed layers including an inside layer, an intermediate layer and an outside layer, said inside layer and said outside layer comprising bidirectional braided sheets, said inside layer and said outside layer comprising a material selected from the group consisting of glass fibers, carbon fibers and boron fibers, said intermediate layer comprising at least one layer of parallel, high-strength longitudinal yarns, at least 10% of said longitudinal yarns being high tensile strength yarns having a higher tensile strength than the remaining longitudinal yarns, said high tensile strength yarns comprising aramid fibers.
A tubular material based on a fabric-reinforced resin, said material comprising a plurality of superimposed layers of fabric, the inside layer and outside layer of said material comprising bidirectional braided sheaths, said inside and outside layers sandwiching at least one intermediate layer of longitudinal yarns, wherein:
- said inside layer and said outside layer comprise bidirectional braids comprising high-strength fibers, and
- said unidirectional intermediate layer comprises at least one layer of parallel, high-strength longitudinal yarns, at least 10% of said longitudinal yarns being high tensile strength yarns having a higher tensile strength than the remaining longitudinal yarns, said high tensile strength yarns comprising aramid.
In a bicycle or similar vehicle frame comprising a number of interconnected tubular members, the improvement comprising:
- said tubular members comprising a tubular material based on a fabric-reinforced resin, said material comprising a plurality of superimposed layers of fabric, the inside layer and outside layer of said material comprising bidirectional braided sheaths, said inside and outside layers sandwiching at least one intermediate layer of longitudinal yarns;
- said inside layer and said outside layer comprising bidirectional braids based on high-strength fibers, and
- said unidirectional intermediate layer comprising at least one layer of parallel, high-strength longitudinal yarns, at least 10% of said longitudinal yarns being high tensile strength yarns having a higher tensile strength than the remaining longitudinal yarns, whereby in the event of rupturing said inside and outside layers, said tubular material will not separate into two portions, said high tensile strength yarns comprising aramid.
Dependencies are inferred from the claim text.