| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a pile driver capable of protecting a lower structure and a leader by preventing an upper structure from swiveling even when swiveling operation of the upper structure is performed erroneously as the leader is tilted forward largely. <P>SOLUTION: A first spindle 22 for supporting a base leader 16a to be tiltable in the forward and backward directions with respect to an upper structure 14 is arranged at a position orthogonal to an axis line of the base leader 16a in the base leader 16a in the horizontal direction, and its both ends 22a each project at both sides of the base leader 16a. A front bracket 15 is connected with the upper structure 14 and the first spindle 22 respectively to be turnable through a rotary pin 29, and is provided with a limit switch 34 for stopping operation of turning means 13 by the rotation angle of the first spindle 22 to rotate according to the forward tilting of the base leader 16a when the base leader 16a is tilted forward more largely than a preset inclination angle. <P>COPYRIGHT: (C)2012,JPO&INPIT |
