| 摘要 |
<p>The present invention relates to a bogie where an operating piece moves forward and backward by the rotation of a towing loop so that a front wheel coupling unit operates up and down in order to connect or disconnect the front wheel. The front wheel and the rear wheel of the bogie can move in the same trajectory, and the bogie can be easily converted into a two-wheel steering or a four-wheel steering bogie. Thus, the bogie can be usually used as a normal bogie but can be converted into a four-wheel steering bogie, as necessary, and be connected with other bogies when multiple bogies are to be connected to move. The bogie can reduce transferring time by minimizing the rotational radius when moving and also can shorten working hours by being converted into a two-wheel or a four-wheel bogie by the simple up and down movement of the towing loop. In addition, the bogie can economically reduce purchase costs without the need to store a two-wheel and a four-wheel bogie together, and can improve work efficiency by being used and stored even in a small field site.</p> |
