Power chuck

Claim 1

IN A MACHINE TOOL SPINDLE HAVING A SOCKET WITH A TAPERED SECTION, THE COMBINATION OF: A TOOL ADAPTER INCLUDING A TAPERED SHANK ADAPTED TO BE RECEIVED IN SAID SOCKET, A TOOL CARRYING PORTION ADJACENT THE LARGER END OF SAID SHANK, AN ANNULAR RADIALLY EXTENDING RIDGE EXTENDING PERIPHERALLY AROUND THE LARGER END OF SAID SHANK, SAID RIDGE PRESENTING AN ANNULAR CAMMING SURFACE, INCLINED TO THE AXIS OF SAID SHANK, FACING TOWARD SAID TOOL CARRYING PORTION OF SAID TOOL ADAPTER; AND A POWER CHUCK IN SAID SPINDLE COMPRISING A PLURALITY OF RADIALLY MOVABLE JAWS MOUNTED ADJACENT THE MOUTH OF SAID SOCKET AND BETWEEN THE LATTER AND SAID TAPERED SECTION OF SAID SOCKET, EACH OF SAID JAWS HAVING A SHOULDER FACING TOWARD THE SOCKET MOUTH FOR ENGAGING THE RIDGE OF A TOOL ADAPTER AS THE RIDGE IS MOVED PAST SAID SHOULDER AND URGING THE JAWS OUTWARDLY, AND POWER MEANS FOR MOVING SAID JAWS RADIALLY INWARDLY, EACH OF SAID JAWS FURTHER HAVING AN ARCUATE CAMMING SURFACE, INCLINED TO THE SPINDLE AXIS, FACING AWAY FROM THE SOCKET MOUTH AND EFFECTIVE UPON RADIALLY INWARD MOVEMENT OF SAID JAWS BY SAID POWER MEANS AFTER THE RIDGE OF A TOOL ADAPTER IS POSITIONED PAST SAID SHOULDER TO ENGAGE A SEGMENTAL PORTION OF SAID ANNULAR CAMMING SURFACE ON SAID RIDGE AND THEREBY DEVELOP AN AXIAL FORCE URGING THE TAPERED SHANK INTO SEATED ENGAGEMENT WITH THE TAPERED SECTION OF SAI SOCKET.