Device and method for generating internal spherical surfaces

Claim 1

A ROTATABLE DEVICE FOR GENERATING AN INTERNAL SPHERICAL SURFACE IN A WORKPIECE COMPRISING: A BODY MEMBER, SAID BODY MEMBER HAVING A SHANK PORTION AT A FIRST END ADAPTED TO BE RECEIVED AND HELD BY MACHINE MEANS AND A SECOND END CONFIGURED TO RECEIVE A PIVOTABLE CUTTING TOOL HOLDER; A CUTTING TOOL HOLDER ADAPTED TO ADJUSTABLY SUPPORT AT LEAST ONE CUTTING TOOL EXENDING THEREFROM; MEANS PIVOTABLY SUPPORTING SAID CUTTING TOOL HOLDER AT SAID SECOND END OF SAID BODY MEMBER, SAID SUPPORTING MEANS HAVING A PIVOT AXIS NORMAL TO THE MAJOR AXIS OF SAID BODY MEMBER FOR CONTINUOUS PIVOTAL MOVEMENT OF SAID CUTTING TOOL HOLDER THROUGH AT LEAST 90* FROM THE ROTATIONAL AXIS OF SAID DEVICE; A CUTTING TOOL ADJUSTABLY SUPPORTED ON SAID CUTTING TOOL HOLDER AND HAVING ITS CUTTING PORTION OF THE OUTER RADIAL EDGE THEREOF; AND MEANS CARRIED BY SAID DEVICE AND OPERATIVELY CONNECTED WITH SAID CUTTING TOOL HOLDER FOR CONTROLLABLY PIVOTING SAID CUTTING TOOL HOLDER ABOUT SAID PIVOTAL AXIS FIXED WITH RESPECT TO SAID MAJOR AXIS OF SAID BODY MEMBER DURING AND INDEPENDENTLY OF ROTATION OF THE DEVICE AND THE WORKPIECE RELATIVE TO EACH OTHER.