Apparatus for performing work on the internal wall of piping

Claim 1

FOR USE WITH PIPING THROUGH WHICH A FLUID UNDER PRESSURE FLOWS, HAVING A VALVE CONTROLLED INLET FOR SAID FLUID AND AN OUTLET FOR THE FLUID DOWNSTREAM OF THE INLET AN APPARATUS FOR PERFORMING WORK ON THE INTERNAL WALL OF THE PIPING AND ADAPTED TO BE DISPOSED ENTIRELY WITHIN THE PIPING BETWEEN THE FLUID INLET AND OUTLET WHEN THE INLET VALVE IS CLOSED COMPRISING A SUPPORT ADAPTED TO TRAVEL THROUGH THE PIPING, MEANS ON SAID SUPPORT ADAPTED TO TO ENGAGE THE INTERNAL WALL OF THE PIPING TO FORM A FLUIDTIGHT SEAL THEREWITH, TO ORIENT THE APPARATUS IN PROPER POSITION IN THE PIPING AND TO PREVENT ROTATION OF SAID SUPPORT AND ADAPTED TO HAVE THE FLUID IMPINGE THEREAGAINST WHEN THE INLET VALVE IS SUBSEQUENTLY OPENED TO MOVE THE SUPPORT THROUGH THE PIPING IN A DOWNSTREAM DIRECTION, SAID MEANS CONSTITUTING THE SOLE MEANS FOR MOVING THE SUPPORT THROUGH THE PIPING, WORKING TOOL MEANS CARRIED BY THE SUPPORT ADAPTED TO PERFORM WORK ON THE INTERNAL WALL OF THE PIPING, MEANS FOR MOUNTING SAID WORKING TOOL MEANS FOR ROTATION RELATIVE TO SAID SUPPORT, AND MEANS ADAPTED TO BE ACTUATED BY THE FLUID FOR ROTATING SAID MOUNTING MEANS AND SAID WORKING TOOL MEANS WITH RESPECT TO SAID SUPPORT AND CONSTITUTING THE SOLE MEANS FOR ACTUATING THE TOOL MEANS, MEANS FOR REDUCING THE EFFECTIVE AMOUNT OF THE FLUID ON SAID ROTATING MEANS FOR THE MOUNTING MEANS AND THE WORKING TOOL MEANS SO THAT THE SPEED OF ROTATION OF SAID MOUNTING MEANS AND SAID WORKING TOOL MEANS IS CONTROLLED BY SAID FLUID REDUCING MEANS.