Drilling and threading attachment

Claim 1

IN AN ATTACHMENT OF THE CHARACTER DESCRIBED, A SPINDLE INCLUDING A BODY PORTION HAVING IN ITS PERIPHERAL SURFACE A LONGITUDINAL GROOVE AND AN ANNULAR GROOVE AT THE FORWARD END OF SAID LONGITUDINAL GROOVE COMMUNICATING THEREWITH, A CARRIER MEMBR AXIALLY SLIDABLE AND ROTATABLE ON SAID BODY PORTION OVER SAID GROOVES, A PIN PROJECTING FROM SAID CARRIER MEMBER AND MOVABLE IN SAID GROOVES, SAID LONGITUDINAL GROOVE HAVING A SPIRALLED SIDE PORTION LEADING TO SAID ANNULAR GROOVE AND ENGAGEABLE BY SAID PIN TO CAUSE FORWARD AXIAL MOVEMENT OF SAID CARRIER MEMBER IN RESPONSE TO A ROTATIONAL FORCE APPLIED THERETO IN A DIRECTION TO URGE SAID PIN AGAINST SAID SPIRALLED SIDE PORTION, SAID PIN BEING, ADAPTED TO PASS FROM SAID SPIRALLED SIDE PORTION INTO SAID ANNULAR GROOVE TO RELEASE SAID CARRIER MEMBER FOR FREE ROTATION RELATIVELY TO SAID SPINDLE IN THE DIRECTION OF SAID FORCE, AND MEANS CARRIED BY SAID ATTACHMENT AND OPERABLE UPON THE APPLICATION OF A ROTATIONAL FORCE TO SAID CARRIER MEMBER IN THE OPPOSITE DIRECTION FOR NON-ROTATABLY AND SLIDABLY CONNECTING SAID CARRIER MEMBER TO SAID SPINDLE IN A POSITION WHEREIN SAID PIN IS DISPOSED IN ALIGNMENT WITH SAID LONGITUDINAL GROOVE TO PERMIT REARWARD SLIDING MOVEMENT OF SAID CARRIER MEMBER ON SAID BODY PORTION.