Patent ID: 8210274

Claim:
A vibration hammer comprising: a main body; a striking unit having a piston housing installed to be elevated in the upper portion of the main body by a hydraulic pressure controlling valve unit installed in the main body, a hammer guide slidably installed in the lower portion of the main body and to be coaxial with and spaced apart from the piston housing, a piston having both ends fixed to the hollow portion of the piston housing and the hollow portion of the hammer guide respectively and is elastically deformable at a predetermined angle with an elevating direction of the piston housing and a rod installed on the end of the piston and including a boring bit at its end; and a rotating unit installed in the main body and reciprocally rotating the hammer guide elevated together with the piston; wherein the elastically deformable portion between the both ends of the piston supported by the piston housing and the hammer guide has the outer diameter smaller than the inner diameter of the hollow portion of the piston housing and the hammer guide.