Dual-mode rail-highway semi-trailer
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United States of America Patent
Stats
-
Jan 1, 1991
Issued Date -
N/A
app pub date -
Jun 10, 1987
filing date -
Nov 18, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A dual-mode semi-trailer having over-the-road or highway running gear with rubber tired wheels in which a demountable flanged rail wheel bogie is employed, the body being supported upon the highway running gear during over-the-road travel by air-spring elements and being supported upon the rail wheel bogie during travel over railroad tracks, structure being provided to selectively raise and lower the highway running gear for selective use in the railroad mode or highway mode of travel, structure also being provided to attach or detach the rail wheel bogie from the body for operation in the rail or highway mode of travel, the semi-trailers bodies being couplable end-to-end to form a train of multiple semi-trailers in the railroad mode of travel. The highway running gear may be of the single axle or tandem axle type, in each case each axle carrying sets of tires of conventional size allowing loads as high as legally permitted to be carried over the road in the highway mode of travel, the highway running gear being slidably mounted to the vehicle body allowing adjustable foreaft positioning to further enhance permissable highway load capacity due to improved weight distribution, the rail wheel bogie being preferably of the dual-axle type.
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