| 摘要 |
The roadway-enclosing equipment comprises one or more oblong portions. A movement mechanism is coupled to each portion. This can comprise rollers (14) on axes parallel to that of the oblong portion (9), and which are movable by a bellows supplied with compressed air from the retracted position into a protruding one, the air being delivered from a compressor or receiver. Endless belts (15) forming crawler tracks can be passed round the rollers. |
