| 摘要 |
The present invention provides a vehicle comprising a frame and a swivelling track, including a track mat, mounted thereon, said track mat being adapted to be lengthened on one side thereof and correspondingly shortened on the other side thereof by the turning, with reference to said frame, of an end roll, rotatably mounted on a shaft, guiding said track mat so as to bring said track mat into a curved position to cause the vehicle to turn. |
