Convertible rail-highway semi-trailer air controlled braking and suspension shifting system
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United States of America Patent
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-
May 3, 1983
Issued Date -
N/A
app pub date -
Sep 25, 1981
filing date -
May 1, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An air control system is provided for a vehicle convertible between highway and railway modes of travel. Air springs suspend a rail-wheel set axle unit and highway wheel-set axle units from the vehicle body so that the one wheel-set axle unit is stored in a raised inoperative position while the other is in the lowered operative position. During a transfer from the highway mode of travel to the railroad mode of travel, or vice-versa, a valved air control system selectively allows the wheel-set axle units to be positioned in either the raised or lowered positions. The air control system also includes, in addition to the mode selection function, the highway braking function, the rail braking function, the parking brake and the emergency brake functions.
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