DRILL DEVICE HAVING A ROTARY-VIBRATORY DRIVE

摘要

The invention relates to a drill device comprising a vibratory drive connected to a drill string for providing a vibration to the drill string, a rotary drive connected to the drill string for providing a rotation to the drill string, characterized in that the vibratory drive is placed between the rotary drive and the drill string, and in that between the vibratory and rotary drives a coupling is placed, which coupling substantially prevents the passing on of vibrations from the vibratory drive to the rotary drive. Preferably the coupling has a first and a second coupling member that are placed coaxially with respect to each other, wherein the first coupling member comprises an internally toothed ring, wherein the second coupling member comprises a toothed wheel, wherein the teeth of the toothed wheel mesh with the toothed ring, wherein at least in a circumferential direction, a space between the teeth of the toothed ring is larger than the thickness of the teeth of the toothed wheel.