Piercing tool and retainer therefor

Claim 1

A TOOL FOR USE IN A PNEUMATIC HAMMER OF THE PERCUSSION TYPE HAVING A STRAIGHT ANNULAR BODY PORTION, AN ANNULAR BALL RECEIVING DEPRESSION IN THE PERIPHERAL SURFACE OF SAID BODY PORTION INTERMEDIATE ITS OPPOSITE ENDS, A CONCAVE GROOVE IN THE PERIPHERAL SURFACE OF SAID TOOL AND EXTENDING THROUGH THE END SURFACE WHICH IS RECEIVED IN A RETAINER, IN COMBINATION WITH A RETAINER HAVING A BALL CAGE SLEEVE, A SLOT THROUGH THE WALL OF SAID SLEEVE, A BALL IN SAID SLOT HAVING A DIAMETER GREATER THAN THE THICKNESS OF THE WALL OF SAID SLEEVE, SAID SLEEVE BEING FURTHER PROVIDED WITH AN APERTURE THROUGH THE WALL THEREOF, A BALL IN THE APERTURE HAVING A DIAMETER GREATER THAN THE WALL THICKNESS OF SAID SLEEVE, SAID FIRST NAMED BALL ADAPTED FOR RECEPTION IN THE ANNULAR DEPRESSION FORMED IN SAID TOOL AND SAID LAST NAMED BALL ADAPTED FOR RECEPTION IN THE CONCAVE GROOVE IN SAID TOOL, AND A ROTATABLE LOCKING SLEEVE SURROUNDING SAID BALL CAGE SLEEVE, SAID LOCKING SLEEVE BEING PROVIDED WITH AN APERTURE THROUGH THE WALL THEREOF HAVING A DIAMETER LESS THAN THE DIAMETER OF SAID FIRST NAMED BALL.