| 摘要 |
PROBLEM TO BE SOLVED: To improve safety effectively in terms of execution while suppressing increase in at least weight and cost by reducing the number of components without causing a problem of attachment.SOLUTION: A pair of crawler frames 2L, 2R each having a crawler 8 fitted on the outer periphery is arranged in right and left both sides of a car body 1, hydraulic cylinders 13 are arranged astride between each crawler frame and the car body, and each crawler frame is provided to be movable between an extended position where an interval between the right and left crawlers is made maximum and a contract position where the interval is made minimum by the hydraulic cylinders. A regulating means 15 for regulating at least contract action of the hydraulic cylinders or the movement from the extended position of each crawler frame by the contract action in the extended position of each crawler frame is provided and the regulating means is provided in the attaching structure 20 of the hydraulic cylinder or a hydraulic circuit. |
