Cutting edge apparatus

Abstract

A cutting edge apparatus includes a cylindrical outer pipe to be driven into a ground. The apparatus includes a vibratable vibration cylinder provided within the outer pipe and being movable relative to the outer pipe in an axial direction of the outer pipe. The apparatus includes a cutting edge member substantially identical in outer size with the outer pipe and being integrally mounted to the outer circumference of the end of the vibration cylinder. The apparatus includes a vibrator mounted to the vibration cylinder and configured to vibrate the vibration cylinder. The vibration cylinder has a tapered rear portion so that the rear portion becomes smaller in size as the rear portion extends toward the rear end of the vibration cylinder.

1 . A cutting edge apparatus comprising: 
 a cylindrical outer pipe to be driven into a ground;    a vibratable vibration cylinder provided within the outer pipe and being movable relative to the outer pipe in an axial direction of the outer pipe;    a cutting edge member substantially identical in outer size with the outer pipe and being integrally mounted to the outer circumference of the end of the vibration cylinder; and    a vibrator mounted to the vibration cylinder and configured to vibrate the vibration cylinder,    wherein the vibration cylinder has a tapered rear portion so that the rear portion becomes smaller in size as the rear portion extends toward the rear end of the vibration cylinder.    
   
   
       2 . The cutting edge apparatus according to  claim 1 , 
 wherein the cutting edge member has a distal end coated with a hard material.    
   
   
       3 . The cutting edge apparatus according to  claim 1 , further comprising: a lubrication supplier configured to supply a lubricant to the outer pipe or the outer circumferential surface of a following pipe provided at the back of the outer pipe.  
   
   
       4 . The cutting edge apparatus according to  claim 1 , 
 wherein the cutting edge member is fixed to the outer circumference of the end of the vibration cylinder.