Apparatus for machining geometric cones

Claim 1

FOR USE WITH A LATHE COMPRISING A ROTARY SPINDLE AND HAVING A LATHE CARRIAGE MOUNTED FOR MOVEMENT IN THE DIRECTION OF THE SPINDLE AXIS AND A CROSS-SLIDE MOUNTED ON THE LATHE CARRIAGE FOR TRANSVERSE MOVEMENT RELATIVE THERETO, A LATHE ATTACHMENT APPARATUS FOR MACHINING GEOMETRIC CONES, SAID APPARATUS COMPRISING: A WORKPIECE; A PATTER CAM HAVING THE CROSS SECTIONAL CONFIGURATION OF THE GEOMETRIC CONE WHICH IS TO BE MACHINED, SAID CAM AND WORKPIECE BEING MOUNTED ON THE LATHE SPINDLE WITH THE CAM DISPOSED COAXIAL WITH THE SPINDLE AXIS, WHEREBY THE CAM AND WORKPIECE OR ROTATABLE BY ROTATION OF SAID SPINDLE; CAM FOLLOWER MEANS DISPOSED IN ENGAGEMENT WITH THE PERIPHERAL EDGE OF THE CAM, WHEREBY A RECIPROCATING LINEAL MOTION WILL BE IMPARTED TO THE CAM FOLLOWER MEANS BY ROTATION OF THE CAM; A TRACER BAR GUIDE MOUNTED FOR PIVOTAL MOVEMENT ABOUT A PIVOT FIXED WITH RESPECT TO THE LATHE BODY AND SLIDABLY AND PIVOTALLY CONNECTED TO SAID CAM FOLLOWER MEANS, WHEREBY RECIPROCATING LINEAL MOTION OF THE CAM FOLLOWER MEANS IMPARTED BY ROTATION OF THE CAM IS CONVERTED TO OSCILLATORY PIVOTAL MOVEMENT OF THE TRACER BAR GUIDE, SAID TRACER BAR GUIDE HAVING A STRAIGHT GUIDE SURFACE THEREON WHICH IS COPLANAR WITH THE AXIS OF SAID TRACER BAR PIVOT;