Drilling apparatus having head

Abstract

Disclosed is a drilling apparatus having a head. The drilling apparatus includes a main body, a lead supported by the main body of the drilling apparatus, a driving shaft slidably installed in the lead and having a unit rod connected thereto for performing a drilling work, and a head having an actuator for driving the driving shaft, wherein the driving shaft includes a screw coupling part formed on the outer circumferential surface of the driving shaft and screw-coupled with an end of the unit rod for performing the drilling work, and a screw coupling inducing part formed at a front end of the screw coupling part to induce screw coupling between the driving shaft and a rod screw coupling part formed at a hollow part formed at the end of the unit rod. The drilling apparatus can reduce the number of work numbers by combining the unit rod with the driving shaft, thereby increasing the efficiency of the drilling work.

What is claimed is: 
     
         1 . A drilling apparatus having a head, comprising:
 a main body;   a lead supported by the main body of the drilling apparatus;   a driving shaft slidably installed in the lead and having a unit rod connected thereto for performing a drilling work; and   a head having an actuator for driving the driving shaft,   wherein the driving shaft includes a screw coupling part formed on the outer circumferential surface of the driving shaft and screw-coupled with an end of the unit rod for performing the drilling work, and a screw coupling inducing part formed at a front end of the screw coupling part to induce screw coupling between the driving shaft and a rod screw coupling part formed at a hollow part formed at the end of the unit rod.   
     
     
         2 . The drilling apparatus of  claim 1 , wherein a stopper is provided on the outer circumferential surface of a top end of the screw coupling part of the driving shaft for preventing the unit rod screw-coupled to the driving shaft from elevating. 
     
     
         3 . The drilling apparatus of  claim 1 , wherein the screw coupling induction part includes a taper part extending from the screw coupling part of the driving shaft to an end of the screw coupling induction part and having diameters gradually decreasing. 
     
     
         4 . A drilling apparatus having a head, comprising:
 a main body;   a lead supported by the main body of the drilling apparatus;   a driving shaft slidably installed in the lead and having a unit rod connected thereto for performing a drilling work; and   a head having an actuator for driving the driving shaft,   wherein the driving shaft includes a first driving shaft supported on the head body by a bearing and exposed to a bottom end of the head body, and a second driving shaft having a screw coupling part screw-coupled coaxially with the first driving shaft and screw-coupled with an end of the unit rod for performing the drilling work, and a screw coupling inducing part formed at a front end of the screw coupling part to induce screw coupling between the driving shaft and a rod screw coupling part formed at a hollow part formed at the end of the unit rod.   
     
     
         5 . The drilling apparatus of  claim 4 , wherein the first driving shaft includes stepped coupling parts having different diameters, and a plurality of second driving shafts having different diameters to be selectively coupled to the coupling parts of the first driving shaft.