Cooling arrangement for crossover tubes

Claim 1

A FLAMETUBE FOR A COMBUSTION CHAMBER, SAID TUBE HAVING AN ANNULAR WALL WITH OPENINGS THEREIN FOR THE FLOW OF AIR INTO THE TUBE, SAID TUBE HAVING A PARTIALLY CLOSED UPSTREAM END, A LATERALLY EXTENDING CORSSOVER TUBE MOUNTED IN A SIDE OPENING IN THE ANNULAR WALL AND PROJECTING OUTWARDLY THEREFROM WITH THE INNER END OF THE LATERAL TUBE SUBSTANTIALLY IN ALIGNMENT WITH THE ANNULAR WALL, SAID LATERAL TUBE BEING WELDED TO THE FLAMETUBE OVER SUBSTANTIALLY THE UPSTREAM HALF OF THE LATERAL TUBE AND HAVING AN OUTWARDLY PROJECTING FLANGE ON THE DOWNSTREAM HALF THEREOF LOCATED WITHIN SAID EXTENDING PARALLEL TO THE ADJACENT FLAMETUBE WALL, THE LATERAL TUBE BEING SPACED FROM THE EDGE OF THE OPENING IN THE FLAMETUBE WALL OVER SUBSTANTIALLY THE DOWNSTREAM HALF OF THE LATERAL TUBE TO FORM A PASSAGE FOR AIR BETWEEN THE LATERAL TUBE AND THE FLAMETUBE WALL AND A SUBSTANTIALLY SEMICYLINDRICAL SHIELD EXTENDING AROUND AND LOCATED IN SPACED CONCENTRIC RELATION TO THE LATERAL TUBE IN THE DOWNSTREAM SIDE THEREOF, SAID SHIELD BEING SECURED ALONG ITS OUTER EDGE TO THE CROSSOVER TUBE AT A POINT AT ITS INNER EDGE TO THE EDGE OF THE OPENING IN THE CURED AT ITS INNER EDGE TO THE EDGE OF THE OPENING IN THE FLAMETUBE WITHIN WHICH THE LATERAL TUBE IS POSITIONED FOR DIRECTING AIR ENTERING THE SPACE BETWEEN THE SHIELD AND THE LATTERAL TUBE INTO THE PASSAGE BETWEEN THE LATERAL TUBE AND THE FLAMETUBE WALL.