| 摘要 |
PURPOSE:To perform easy running of a vehicle over a step even when a substance to be conveyed is heavy by a method wherein a frontward protruding wheel protruded from the front of a car body is provided, and an intermediate wheel to support a car boby on the step difference when a vehicle is traveling over the step defference is arranged at the central part in a longitudinal deirection of a car body. CONSTITUTION:A fixed caster 2 being a frontward protruding wheel is attached to the front of a bed plate 1 and a swivel caster 3 is attached to the rear of the bed plate 1 and brought into contact with earth to support the bed plate 1. An intermediate caster 4 and a rear caster 5 are attached in the intermediate position between the fixed caster 2 and the swivel caster 3 and the rear position, respectively, of the swivel caster 3 in a state to be separated away from a floor by a distance of approximately 5-10mm. When a step differnce 14 is present, the fixed caster 2 is brought into contact with the front thereof. When a handle 8 is turned down to this side, the front part of a track 13 is placed on the step difference 14. When a vehicle is further advanced, the intermediate caster 4 is placed on the step difference 14 and when, with this state, the handle 8 is pushed forward, the truck 13 is transferred to a position above the step difference 14 around the intermediate caster 4 and with this state, the vehicle is advanced in a horizontal posture. |
