Power-driven tool for drilling or impact-drilling

Claim 1

A POWER-DRIVEN TOOL FOR DRILLING OR IMPACT-DRILLING COMPRISING A HOUSING, A SHAFT JOURNALED FOR ROTATION IN SAID HOUSING, POWER-DRIVEN MEANS TO ROTATE SAID SHAFT, SAID SHAFT HAVING A FORWARD PORTION, A SPINDLE HAVING A BLIND AXIAL BORE, SAID FORWARD PORTION OF SAID SHAFT BEING RECEIVED WITHIN SAID BLIND AXIAL BORE OF SAID SPINDLE, MEANS INTERCONNECTING SAID SPINDLE AND SAID SHAFT, WHEREBY SAID SPINDLE IS CONSTANTLY ROTATED BY SAID SHAFT, AND WHEREBY SAID SPINDLE IS FREE TO MOVE AXIALLY WITH RESPECT TO SAID SHAFT, A STATIONARY CAM ELEMENT RETAINED IN SAID HOUSING CONCENTRICALLY ABOUT SAID SHAFT AND REARWARDLY OF SAID SPINDLE, SAID STATIONARY CAM ELEMENT INCLUDING A FORWARD FACE HAVING A FIRST SERIES OF CIRCUMFERENTIALLYSPACED NOTCHED TEETH FORMED THEREON, SAID SPINDLE INCLUDING A REARWARD COLLAR PORTION HAVING BOTH FORWARD FACE AND A REARWARD FACE, A SECOND SERIES OF CIRCUMFERENTIALLY-SPACED NOTCHED TEETH FORMED ON SAID REARWARD FACE OF SAID COLLAR PORTION AND AXIALLY ALIGNED WITH SAID NOTCHED TEETH ON SAID STATIONARY CAM ELEMENT, A SPINDLE BEARING SLEEVE BETWEEN SAID SPINDLE AND SAID HOUSING AND ABUTTING AGAINST SAID FORWARD FACE OF SAID COLLAR PORTION OF SAID SPINDLE, SAID SPINDLE BEARING SLEEVE HAVING A THREADED ENGAGEMENT WITH SAID HOUSING, EXTERNALLYACCESSIBLE MEANS TO SELECTIVELY ROTATE SAID SPINDLE BEARING SLEEVE INTO AND OUT OF SAID HOUSING, THEREBY VARYING THE AXIAL SPACING BETWEEN SAID FIRST AND SECOND SERIES OF NOTCHED TEETH, RESILIENT MEANS URGING SAID SPINDLE OUT OF SAID HOUSING, AND A THRUST BEARING MOUNTED ON SAID SPINDLE FORWARDLY OF SAID SPINDLE BEARING SLEEVE, WHEREBY IN THE IMPACT-DRILLING POSITION SAID FIRST AND SECOND SERIES OF NOTCHES TEETH IMPACT AGAINST EACH OTHER, AND WHEREBY IN THE DRILL POSITION SAID THRUST BEARING ABUTS AGAINST SAID SPINDLE BEARING TO PRECLUDE SAID NOTCHED TEETH FROM ABUTTING TOGETHER.