Patent ID: 7568529
Filing Date: 2009-08-04
Classification: B06B,B25D,B28D

Abstract:
1. A drill tool comprising: a drive source accommodated in a tool body; a bit drive shaft rotation-driven by the drive source and projecting from a front end of the drill body; a diamond bit attached to a front end of the bit drive shaft; and a vibrating apparatus configured to generate vibrating force in an axial direction of the bit drive shaft and vibrating moment in a rotational direction of the bit drive shaft, wherein a magnitude of the vibrating force pulsates and a magnitude of the vibrating moment pulsates, wherein the vibrating apparatus comprises: two eccentric weights arranged on the same axial line orthogonal to an axial line of the bit drive shaft and opposite to each other in substantially symmetrical positions about the axial line of the bit drive shaft; a vibrating apparatus motor configured to drive the two eccentric weights in rotational directions reverse to each other; and an output shaft of the vibrating apparatus motor is arranged on the same axial line as the axial line of the bit drive shaft.