Apparatus for painting, scale removing, traction and so on for massive bodies made of iron plates

Claim 1

A REMOTELY CONTROLLABLE APPARATUS FOR PERFORMINA A SURFACE TREATING OPERATION ON AN IRON BODY, COMPRISING A RIGID FRAME OF NON-MAGNETIC MATERIAL AND HAVING LONGITUDINAL SIDE PIECES, SAID SIDE PIECES HAVING A PLURALITY OF RECESSES THEREIN TRANSVERSE TO THE PLANE OF THE RIGID FRAME, A PLURALITY OF PAIRS OF FOOT PIECES OF MAGNETIC MATERIAL, ONE PAIR OF FOOT PIECES SLIDABLY POSTIONED IN EACH RECESS FOR SLIDING MOVEMENT INTO AND OUT OF THE RECESS, AT LEAST ONE PERMANENT MAGNET MOUNTED BETWEEN THE FOOT PIECES IN EACH PAIR OF FOOT PIECES ADJACENT THE ONE ENDS OF THE FOOT PIECES WITHIN THE RECESSES AND THE OTHER ENDS OF THE FOOT PIECES PROJECTING OUT OF THE RECESS, A ROLLER OF NON-MAGNETIC MATERIAL ROTATABLY MOUNTED BETWEEN THE FOOT PIECES ADAJCENT THE ENDS OF THE FOOT PIECES PROJECTING OUT OF THE RECESSES, AN ENDLESS CHAIN OF NON-MAGNETIC MATERIAL ALONG EACH SIDE PIECE OF THE GRAME AND RUNNING OVER EACH ROLLER OF THE SUCCESSIVE PAIRS OF FOOT PIECES IN SAID PLURALITY OF FOOT PIECES ON THE RESPECTIVE SIDE PIECES OF THE FRAME THE CHAIN AS IT PASSES OVER EACH ROLLER BEING POSITIONED BETWEEN THE ROLLER OF A PAIR OF FOOT PIECES AND THE OTHER ENDS OF THE FOOT PIECES, THE RADIUS OF THE ROLLER PLUS THE THICKNESS OF THE CHAIN BEING SLIGHTLY GREATER THAN THE DISTANCE FROM THE AXIS OF THE ROLLER TO THE ENDS OF THE FOOT PIECES, MOTOR MEANS MOUNTED ON THE FRAME AND COUPLED TO SAID ENDLESS CHAINS FOR DRIVING SAID CHAINS FOR MOVING THE APPARATUS OVER THE SURFACE OF AN IRON BODY AND STEERING THE APPARATUS DURING SUCH MOVEMENT, AND MEANS ON SAID FRAME FOR PERFORMING A SURFACE TREATING OPERATION ON THE IRON BODY.