Target-type pilot burner

Claim 1

IN COMBINATION WITH A SOURCE OF COMBUSTION GAS UNDER PRESSURE, ORIFICE MEANS CONNECTED TO SAID SOURCE FOR DISCHARGING AN UPWARDLY DIRECTED JET OF COMBUSTION GAS FROM SAID SOURCE, AND A VERTICALLY EXTENDING THERMOCOUPLE ASSEMBLY PROJECTING UPWARDLY AT THE FRONT SIDE OF SAID ORIFICE MEANS IN SPACED RELATIONSHIP THEREWITH; THE IMPROVEMENT COMPRISING A COMBINATION INCINERATOR-TARGET TYPE PILOT BURNER HOOD ASSEMBLY COMPRISING A FIRST VERTICALLY DISPOSED OPEN ENDED TUBULAR MEMBER, MEANS ON THE LOWER END OF SAID FIRST TUBULAR MEMBER FOR MOUNTING SAID FIRST TUBULAR MEMBER UPON SAID ORIFICE MEANS AT A LOCATION SUCH THAT A JET OF COMBUSTION GAS DISCHARGED UPWARDLY FROM SAID ORIFICE MEANS PASSES UPWARDLY AND CENTRALLY THROUGH SAID FIRST TUBULAR MEMBER, A TARGET MOUNTED AT THE UPPER END OF SAID FIRST MEMBER AND INCLINED UPWARDLY AND FORWARDLY FROM THE REARWARD SIDE OF SAID FIRST TUBULAR MEMBER TO OVERLIE THE OPENING AT THE UPPER END OF SAID FIRST TUBULAR MEMBER AND TO DEFINE A RELATIVELY OPEN REGION ABOVE SAID FIRST TUBULAR MEMBER FOR THE INJECTION OF SECONDARY AIR TO MIX WITH COMBUSTION GAS ABOVE SAID FIRST TUBULAR MEMBER, A SECOND VERTICALLY DISPOSED OPEN ENDED TUBULAR MEMBER MOUNTED WITHIN SAID FIRST TUBULAR MEMBER TO DEFINE AN ANNULAR PASSAGE BETWEEN THE INNER WALL OF SAID FIRST TUBULAR MEMBER AND THE OUTER WALL OF SAID SECOND TUBULAR MEMBER, THE UPPER END OF SAID SECOND TUBULAR MEMBER BEING LOCATED AT SUBSTANTIALLY THE SAME LEVEL AS THE UPPER END OF SAID FIRST TUBULAR MEMBER AND THE LOWER END OF SAID SECOND TUBULAR MEMBER BEING SPACED UPWARDLY FROM THE LOWER END OF SAID FIRST TUBULAR MEMBER, SAID SECOND TUBULAR MEMBER BEING RELATED TO SAID MOUNTING MEANS IN A FASHION SUCH THAT A GAS JET DISCHARGED FROM SAID ORIFICE MEANS PASSES UPWARDLY THROUGH SAID SECOND TUBULAR MEMBER TO THEREBY INSPIRATE A FLOW OF AIR DOWNWARDLY THROUGH THE ANNULAR PASSAGE BETWEEN SAID TUBULAR MEMBERS FOR MIXTURE WITH THE JET OF GAS AT THE LOWER END OF SAID SECOND TUBULAR MEMBER, SAID SECOND TUBULAR MEMBER BEING OFFSET REARWARDLY WITHIN SAID FIRST TUBULAR MEMBER WHEREBY THE RADIAL WIDTH OF SAID ANNULAR PASSAGE IS GREATEST ADJACENT THE FORWARD SIDE OF SAID ASSEMBLY, AND SAID TARGET BEING POSITIONED TO DEFLECT A PILOT FLAME AT THE UPPER END OF SAID SECOND TUBULAR MEMBER LATERALLY ACROSS THE FORWARD PORTION OF THE UPPER END OF SAID ANNULAR PASSAGE INTO OPERATIVE RELATIONSHIPS WITH SAID THERMOCOUPLE ASSEMBLY AND TO AT LEAST PARTIALLY RESTRICT THE FLOW OF AIR INSPIRATED THROUGH SAID PASSAGE WHILE AT THE SAME TIME DEFINING THE UPPER BOUNDARY OF SAID REGION FOR THE INJECTION OF SECONDARY AIR INTO THE PRIMARY AIR-COMBUSTION GAS MIXTURE DISCHARGED FROM THE UPPER END OF SAID SECOND TUBULAR MEMBER.