Apparatus for machining articles such as pistons for internal combustion engines

Claim 1

APPARATUS FOR MACHINING A WORKPIECE HAVING AN AXIS TO A SHAPE IN CROSS SECTION WHICH IS SELECTIVELY VARIABLE ALONG SAID AXIS FROM CIRCULAR TO ELLIPTICAL AND WHICH IS TAPERED IN THE DIRECTION OF SAID AXIS, SAID APPARATUS COMPRISING MEANS FOR ROTATING SAID WORKPIECE ABOUT THE AXIS THEREOF, A CUTTING TOOL, A HOUSING SUPPORTING SAID CUTTING TOOL, MEANS FOR MOVING SAID HOUSING ALONG A PATH SUBSTANTIALLY PARALLEL TO AND ADJACENT SAID AXIS FOR ENGAGING SAID TOOL WITH SAID WORKPIECE, A BELL CRANK MEMBER PIVOTALLY SUPPORTED INTERMEDIATE THE ENDS THEREOF ON SAID HOUSING AND HAVING SAID TOOL SUPPORTED ON ONE END THEREOF, A ROTATABLE CAM IN SAID HOUSING, A LEVER HAVING ONE END DISPOSED FOR FOLLOWING SAID CAM, PIVOT MEANS CONNECTING THE OPPOSITE ENDS OF SAID CRANK AND SAID LEVER, MEANS MOVABLY SUPPORTED IN SAID HOUSING AND ENGAGED WITH A PORTION OF SAID LEVER SO AS TO FORM A FULCRUM FOR SAID LEVER, SAID FULCRUM MEANS BEING MOUNTED IN SAID HOUSING FOR MOVEMENT ALONG SAID LEVER PORTION IN A PREDETERMINED LINE FROM A BEGINNING POSITION, SAID FULCRUM MEANS BEING ADJUSTABLE IN SAID HOUSING SO THAT SAID LINE IS MOVABLE BETWEEN A POSITION PARALLEL TO AND A POSITION NONPARALLEL TO SAID LEVER PORTION, MEANS MAINTAINING SAID LEVER PORTION IN ENGAGEMENT WITH SAID FULCRUM MEANS DURING FOLLOWING MOVEMENT OF SAID ONE END OF SAID LEVER ON SAID CAM, AND MEANS RESPONSIVE TO MOVEMENT OF SAID HOUSING ALONG SAID PATH FOR MOVING SAID FULCRUM MEANS ALONG SAID PREDETERMINED LINE.