Pipe cleaning and coating apparatus

Claim 1

APPARATUS FOR REMOVING SOLID SCALE-FORMING MATERIALS FROM INTERIORS OF CONDUITS AND PIPES SUCH AS BOILER TUBES HAVING OPPOSITE OPEN ENDS AND BEING SUBJECT TO SCALE-PRODUCING ACTIONS OF HARD WATER, THE APPARATUS BEING ADAPTED FOR COATING SUCH INTERIORS WITH PROTECTIVE LIQUID COATING COMPOSITIONS, WHICH APPARATUS IS ADAPTED TO BE PROGRESSIVELY ADVANCED AND RETRACTED, SELETIVELY, THROUGH AND OUT FROM SUCH TUBES AND WHICH COMPRISES IN COMBINATION, A CHAMBER FOR MAINTAINING A SUPPLY OF AIR UNDER PRESSURE, MEANS FOR INTRODUCING COMPRESSED AIR INTO THE CHAMBER, A NOZZLE ASSEMBLY CARRIED BY THE CHAMBER, LIQUIDSUPPLYING CONDUIT MEANS EXTENDING THROUGH THE CHAMBER AND NOZZLE ASSEMBLY, A LIQUID-CONTROL VALVE IN THE CONDUIT MEANS FOR OPENING AND CLOSING THE CONDUIT MEANS, SELECTIVELY, AIR DUCTS INTERCONNECTING THE CHAMBER AND NOZZLE ASSEMBLY FOR DISCHARGING COMPRESSED AIRFROM THE CHAMBER THROUGH THE NOZZLE ASSEMBLY, VALVE-OPERATING MECHANISM CARRIED BY SAID LIQUID SUPPLY CONDUIT, SAID VALVE OPERATING MECHANISM COMPRISING A SPRING BIASED PLUNGER IN COMMUNICATION THROUGH A DIAPHRAGM WITH SAID LIQUID-CONTROL VALVE FOR OPERATING THE LIQUID-CONTROL VALVE, AND PIVOTALLY MOUNTED LEVER MEANS MOUNTED ON SAID LIQUID SUPPLY CONDUIT ACTING ON SAID SPRING BIASED PLUNGER OF SAID VALVE OPERATING MECHANISM FOR OPENING AND CLOSING THE VALVE SELECTIVELY RESPONSIVELY TO ADVANCEMENT AND RETRACTION OF THE LEVER MEANS BEYOND EITHER END OF THE TUBE BEING CLEANED AND COATED.