Patent ID: 8839852

Claim:
An excavator comprising: a body including a driving device generating a rotating driving force; a leader supported by the body and having a predetermined length; a head including a frame which is sliding along the leader and fixing a top portion of a first rod; a rod clamp installed at a bottom end of the leader and clamping a second rod inserted into the ground; and a position fixture sliding along the leader by means of the head and aligning the first rod with the second rod when assembling the first rod and the second rod, wherein the position fixture includes: a base member slidably installed on the leader, the base member having a first side and a second side opposite the first side, a support plate positioned adjacent the first side of the base member and including a support groove, into which a bottom portion of the first rod is laterally inserted for coaxially aligning the position of the first rod with the second rod clamped by the rod clamp, and a locking unit positioned adjacent the second side of the base member and including a locking bracket, wherein, in a case where the head is elevated and the locking bracket is locked on the frame of the head, the position fixture is elevated together with the head and wherein, in a case where the head is lowered, the position fixture is lowered together with the head until the base member is brought into contact with the rod clamp and comes to a halt after the base member is brought into contact with the rod clamp, thereby the locking bracket being disengaged from the frame of the head.