Patent ID: 8469641

Claim:
A tool for drilling a bore, wherein the tool comprises: a casing; a tool-holder spindle which extends along an axis and which is to carry a drilling tool; and a drive mechanism for driving the tool-holder spindle, wherein the drive mechanism is capable of driving the drilling tool simultaneously in rotation about an axis and in translation along the axis in accordance with an advance movement, the drive mechanism being suitable for combining the advance movement of the spindle with an oscillating movement along the axis of an amplitude sufficient to break up swarf formed, while at the same time keeping the drilling tool in the bore which is in the process of being drilled, the drive mechanism comprising: a first drive member for driving the spindle in rotation about its axis relative to the casing; a second drive member for driving the spindle in translation along its axis relative to the casing, the second drive member being screwed onto a threaded portion of the spindle, so that the spindle advances or returns along the axis as a function of a relative rate of rotation of the first drive member and the second drive member, wherein the second drive member is movably coupled to a clutch at a first end of the second drive member; and a cam/cam follower unit for ensuring the oscillating movement of the spindle, the cam/cam follower unit comprising a cam and a cam follower, the cam being fixed for rotation with the spindle, and the cam follower being fixed for rotation with the second drive member, wherein the second drive member includes the cam follower at a second end of the second drive member and wherein the cam is distinct from the second drive member and positioned adjacent to the cam follower.