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US 4,083,491 AGranted
Synthetic railroad crosstie
AssigneeThe Dow Chemical Company
InventorAlbert A. Hill
Life of this patent
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AssigneeThe Dow Chemical Company
InventorAlbert A. Hill
Estimating the term…
A railroad crosstie is constructed from at least two individually distinct rail support blocks interconnected by a web system which is fastened to the blocks and which comprises at least one self-supporting rigid sheet member adapted to be buried in the roadway ballast when the tie is in place. The blocks are selected to support and secure rails in conventional manner, and the interconnecting web system holds the blocks in relative position in the roadbed. The rigid sheet member adapted to be buried in the roadway ballast is advantageously disposed or provided with means such as horizontal longitudinal corrugations to interact mechanically with the particles of standard railroad ballast, whereby the tie resists being withdrawn from the roadbed. Exemplary ties have trapezoidal rail support blocks of cellular high density polyethylene interconnected with side panels of longitudinally corrugated steel sheet, which ties are lighter than standard wood ties but have comparable load properties and durability superior to wood.
In a railroad crosstie, adapted to support rails on a railway roadbed, comprising at least two rail-support blocks and a web system interconnecting and fastened to such blocks, each rail-support block having a base face and a rail face, each such block being adapted to support a rail and to receive rail fastening devices on its rail face, the rail-support blocks being separated from each other by distances corresponding to the distances separating rails to be carried by that crosstie, the interconnecting web system comprising at least one self-supporting rigid sheet component adapted to be buried in particulate ballast when the crosstie is in place in the roadbed, said sheet component having means to interact mechanically with the ballast, the improvement wherein the said self-supporting rigid sheet component is composed of non-metallic material.
A railroad crosstie, adapted to support rails on a railway roadbed, comprising at least two rail-support blocks and a web system interconnecting and fastened to such blocks, each rail-support block having a base face and a rail face, each such block being adapted to support a rail and to receive rail fastening devices on its rail face, the rail-support blocks being separated from each other by distances corresponding to the distances separating rails to be carried by that crosstie, the interconnecting web system comprising at least one self-supporting rigid sheet component adapted to be buried in particulate ballast when the crosstie is in place in the roadbed, said sheet component having means to interact mechanically with the ballast, wherein the rail-support blocks have aligned side faces and rectangular cross-section transverse of the crosstie and the interconnecting web system comprises two side panels of non-metallic, self-supporting rigid sheet each of which sheets interfaces with one set of aligned side faces of the rail-support blocks and is fastened to such side faces.
In a railroad crosstie, adapted to support rails on a railway roadbed, comprising at least two rail-support blocks and a web system interconnecting and fastened to such blocks, each rail-support block having a base face and a rail face, each such block being adapted to support a rail and to receive rail fastening devices on its rail face, the rail-support blocks being separated from each other by distances corresponding to the distances separating rails to be carried by that crosstie, the interconnecting web system comprising at least one self-supporting rigid sheet component adapted to be buried in particulate ballast when the crosstie is in place in the roadbed, said sheet component having means to interact mechanically with the ballast, the improvement wherein the rail-support blocks have aligned side faces, the interconnecting web system comprises two of said self-supporting rigid sheet components in the form of two side panels of self-supporting rigid sheet and also comprises a bottom panel lying in a plane parallel to the base faces of the rail-support blocks and having side edges secured to the side panels, the bottom panel running lengthwise of the crosstie between but not beneath the rail-support blocks.
A railroad crosstie, adapted to support rails on a railway roadbed, comprising at least two rail-support blocks and a web system interconnecting and fastened to such blocks, each rail-support block having a base face and a rail face, each such block being adapted to support a rail and to receive rail fastening devices on its rail face, the rail-support blocks being separated from each other by distances corresponding to the distances separating rails to be carried by that crosstie, the interconnecting web system comprising at least one self-supporting rigid sheet component adapted to be buried in particulate ballast when the crosstie is in place in the roadbed, said sheet component having means to interact mechanically with the ballast, wherein the rail-support blocks are composed of cellular high density polyethylene having average bulk density from about 15 to about 50 pounds per cubic foot and have aligned longitudinally corrugated side faces, and the interconnecting web system comprises two side panels of self-supporting rigid sheet metal each of which metal panels is corrugated longitudinally to match the interfacing corrugations on the side faces of the said rail-support blocks and is fastened to such side faces, and the interconnecting web system also comprises a bottom panel lying in a plane parallel to the base faces of the rail-support blocks and having side edges secured to the side panels, the bottom panel running lengthwise of the crosstie between but not beneath the rail-support blocks.
Dependencies are inferred from the claim text.