| 摘要 |
According to an embodiment of the present invention, a construction machine includes a central pin and a stopper. The central pin includes: a supporting body, a rotary body combined to a part of the supporting body to be rotatable and an end thereof processed in a stepping manner; and is the center of rotation of the rotary body by penetrating the supporting body and the rotary body. The stopper is combined either to the supporting body or the rotary body, and controls the rotation of the central pin by fitting the end of the central pin processed in a stepping manner. |
