| 摘要 |
An air suspension unit for a road/rail trailer comprises a road wheel axle (10) which mounts to a chassis or frame of the trailer for movement by air-operated means (52;17,21) between lowered operative and raised stowed positions of the road wheel or wheels carried by the axle, and axle retention means (22) for retaining the axle in the stowed position for rail travel of the trailer. The retaining means comprises jaws (24) which are normally mechanically urged, e.g. by spring loading, to a closed position in which they engage around the axle (10) in its stowed position to retain the axle in that position, and are opened by an air operated piston (35) to release the axle. The piston connects to the air supply of the trailer to which the unit is applied for use. Therefore, when the trailer is supported on bogies for rail travel with the axle held in the stowed position by the jaws (24) and the trailer is separated from is tractor so that the air supply is disconnected, the piston (35) is automatically inoperative and cannot open the jaws to release the axle from the stowed position. |
