Long travel soot blower with telescopic feed tube

Claim 1

A LONG-RETRACTING TYPE SOOT BLOWER COMPRISING A FRAME, A CARRIAGE MOVABLY MOUNTED ON SAID FRAME, A LANCE TUBE FORMED WITH A NOZZLE IN THE FORWARD END THEREOF SUPPORTED ON SAID CARRIAGE AND MOVABLE THEREBY TO AND FROM A RETRACTED INOPERATIVE POSITION AND A PROJECTED CLEANING POSITION, A TELESCOPIC FEED TUBE ON SAID FRAME COMPRISING A PLURALITY OF SEALED TELESCOPICALLY MOUNTED SECTIONS DISPOSED IN SEALED TELESCOPIC SLIDING RELATIONSHIP WITH THE OUTERMOST SECTION THEREOF DISPOSED IN COMMUNICATION WITH THE INTERIOR OF SAID LANCE TUBE IN ALL MOVED POSITIONS THEREOF AND EXTENSIBLE AND CONTRACTIBLE IN RESPONSE TO MOVEMENT OF SAID CARRIAGE BETWEEN SAID RETRACTED AND SAID PROJECTED POSITION, SAID SECTIONS DISPOSED IN LONGITUDINALLY STATIONARY RELATIONSHIP RELATIVE TO EACH OTHER DURING A PORTION OF THE TRAVEL OF SAID LANCE TUBE BETWEEN THE RETRACTED AND PROJECTED POSITIONS, SEALING MEANS ON SAID CARRIAGE DISPOSED IN FRICTIONAL SEALING RELATIONSHIP AROUND SAID OUTERMOST SECTION OF SAID FEED TUBE PERMITTING INDEPENDENT LONGITUDINAL SLIDING MOVEMENT THEREOF RELATIVE TO SAID CARRIAGE AND SAID LANCE TUBE DURING A PORTION OF THE LONGITUDINAL TRAVEL OF SAID CARRIAGE, AND SUPPLY MEANS FOR SUPPLYING A PRESSURIZED BLOWING MEDIUM TO SAID FEED TUBE FOR DISCHARGE THROUGH SAID NOZZLE IN SAID LANCE TUBE.