Convertible roll-belt abrading machine

Claim 1

A SURFACE FINISHING MACHINE COMPRISING, IN COMBINATION. A SUPPORTING FRAME, A TABLE SUPPORTED BY SAID FRAME AND MEANS ON SAID TABLE FOR TRANSLATING A WORKPIECE OVER SAID TABLE, A DRIVE ROLLER JOURNALLED ON SAID FRAME IN SPACED PARALLELISM ABOVE SAID TABLE AND MEANS FOR DRIVING SAID DRIVE ROLLER, A PEDESTAL MOUNTED ON SAID FRAME TO ONE SIDE OF SAID DRIVE ROLLER AND INCLUDING AN UPPER END PORTION DISPOSED ABOVE SAID DRIVE ROLLER, SAID UPPER END PORTION OF THE PEDESTAL DEFINING A CYLINDER, A PISTON RECEIVED IN SAID CYLINDER AND PROJECTING UPWARDLY FROM SAID UPPER END OF THE PEDESTAL, MEANS FOR SUPPLYING FLUID UNDER PRESSURE TO SAID CYLINDER TO EXTEND SAID PISTON, A PLATFORM CARRIED BY THE UPPER END OF SAID PISTON FOR OSCILLATION ABOUT THE AXIS OF SAID PISTON, A TRACKING ROLLER JOURNALLED ON SAID PLATFORM ABOUT AN AXIS CONTAINED WITHIN A PLANE PARALLEL TO A PLANE CONTAINING THE AXIS OF SAID DRIVE ROLLER, AN ENDLESS ABRASIVE BELT TRAINED ABOUT SAID DRIVE AND TRACKING ROLLERS AND DEFINING SPACED VERTICAL FLIGHTS LYING ON OPPOSITE SIDES OF SAID UPPER END PORTION OF THE PEDESTAL, AN ARM FIXED TO THE UPPER END PORTION OF SAID PEDESTAL AND PROJECTING LATERALLY THEREFROM TO EXTEND OUTWARDLY FROM BETWEEN SAID FLIGHTS, A ROD RECIPROCABLY CARRIED BY THE FAR END PORTION OF SAID ARM FOR MOVEMENT ALONG A PATH SUBSTANTIALLY PARALLEL TO WORKPIECE MOVEMENT, A PIN CONNECTED TO SAID ROD AND EXTENDING RADIALLY THEREFROM, A COLLAR FIXED TO SAID PLATFORM AND SLIDABLY RECEIVING SAID PIN, AND MEANS FOR RECIPROCATING SAID ROD TO OSCILLATE SAID PLATFORM.