Rolling machine for forming tubular workpieces

Claim 1

A MACHINE FOR FORMING A PREDETERMINED CONFIGURATION ON THE INNER SURFACE OF A GENERALLY TUBULAR WALLED WORK PIECE WHICH INITIALLY HAS AN UNFINISHED INTERNAL SURFACE DIMENSIONALLY GREATER THAN SAID PREDETERMINED CONFIGURATION COMPRISING A ROTATABLE FINISHING ARBOR OF A CONFIGURATION CORRESPONDING TO SAID PREDETERMINED CONFIGURATION, SPINDLE MEANS FOR ROTATABLY SUPPORTING THE WORK PIECE IN CONCENTRIC TELESCOPED RELATION ABOUT THE ARBOR, MEANS FORMING A PLURALITY OF TRANSVERSELY SHIFTABLE ROLLER SUPPORTS, A FORM ROLLER JOURNALLED ON EACH SUPPORT FOR CONJOINT ROTATION WITH THE WORK PIECE, A PLURALITY OF INDIVIDUAL HYDRAULIC MOTORS, ONE FOR EACH OF THE SUPPORTS, CONNECTED TO SHIFT THE SUPPORTS TO AND FRO, A PLURALITY OF ROTARY CAM POWERED AND CONTROLLED LIQUID COLUMN TYPE MOTION TRANSFER DEVICES, ONE FOR EACH OF THE HYDRAULIC MOTORS, CONNECTED TO OPERATE THE HYDRAULIC MOTORS, AND COMMON CAMSHAFT MEANS FOR DRIVING THE TRANSFER DEVICES IN UNISON TO SYNCHRONOUSLY SHIFT THE ROLLER SUPPORTS TRANSVERSELY TO ROLL THE WORK PIECE WALL PROGRESSIVELY INWARDLY BETWEEN THE PLURALITY OF FORM ROLLERS AND TO TERMINATE THE TRANSVERSE SHIFTING JUST AFTER THE INTERNAL SURFACE OF THE WORK PIECE WALL MAKES COMPLETE PERIPHERAL CONTACT WITH THE ARBOR BUT BEFORE ANY NOTICEABLE THINNING OF THE WORK PIECE WALL TAKES PLACE.