Turret for a machine tool

Claim 1

IN TOOL CHANGING AND SUPPORTING APPARATUS FOR A MACHINE TOOL HAVING A BED, TURRET APPARATUS COMPRISING: A BASE SECTION ON SAID BED; A HEAD SECTION DISPOSED ON SAID BASE SECTION AND CONSTRUCTED TO CARRY A TOOL FOR WORKING A BLANK; MEANS ROTATABLY MOUNTING SAID HEAD SECTION ON SAID BASE SECTION FOR ROTATION RELATIVE TO THE BASE SECTION; MEANS ON SAID HEAD SECTION FOR MOUNTING A TOOL HOLDER; A FIRST RING FIXEDLY CONNECTED TO SAID HEAD SECTION AND ROTATABLE THEREWITH, THE RING HAVING A PAIR OF DIAMETRICALLY OPPOSITE RADIALLY EXTENDING V-SHAPED SLOTS; A SECOND RING FIXEDLY CONNECTED TO SAID BASE SECTION AND DISPOSED RADIALLY INWARDLY OF FIRST SAID RING AND HAVING A PAIR OF DIAMETRICALLY OPPOSED RADIALLY EXTENDING V-SHAPED SLOTS; A PAIR OF SHOES DISPOSED ABOVE SAID RINGS AND DIAMETRICALLY OPPOSITE ONE ANOTHER; MEANS EXERTING A FORCE ON SAID HEAD SECTION TO ROTATE THE SAME UNTIL SAID V-SHAPED SLOTS ARE IN SUBSTANTIAL RADIAL ALIGNMENT AND THEN RELIEVE SAID FORCE; AND MEANS TO CAUSE SAID SHOES TO MOVE DOWNWARDLY INTO SAID SLOT WHEN THE SLOTS ARE IN SUBSTANTIAL RADIAL ALIGNMENT, SAID RINGS ARE RADIALLY SPACED FROM ONE ANOTHER AND EACH SHOE HAS A PISTON ROD EXTENDING DOWN THROUGH THE SPACE BETWEEN THE RINGS, THE PISTON ROD BEING CONNECTED TO A PISTON DISPOSED IN A CYLINDER FORMED IN SAID BASE SECTION, THE PISTON BEING FOR USE IN MOVING SAID SHOES IN AND OUT OF SAID SLOTS.