Heat-exchanger core-unit construction

Claim 1

A RENITENT, TUBE-SUPPORTING HEADER-PLATE FOR COREUNITS FOR HEAT-EXCHANGERS OF THE TYPE WHEREIN A PAIR OF THE HEADER-PLATES ARE ADAPTED TO BE SPANNED BY AND SUPPORTED ON AN ASSEMBLY OF FINNED FLAT TUBES WITH ROUNDED LATERAL EDGES AND WHICH HEAT-EXCHANGERS ARE USED IN THE COOLING SYSTEMS OF HEAT-ENGINES POWERING MOTOR VEHICLES, THE HEADER-PLATE HAVING A SERIES OF ELONGATED OPENINGS FORMED WITHIN THE OPPOSITE FACES THEREOF AND PRESENTING CONTINUOUS FLAT PARALLEL SURFACES WITH ROUNDED ENDS DISPOSED NORMAL TO THE PLATE AND APPROXIMATING THE EXTERIOR CROSS-SECTIONAL CONTOUR OF THE ABOVE-DEFINED TUBES, THE PLATE ALSO HAVING PORTIONS THEREOF AT THE OPPOSITE ENDS OF THE OPENINGS EXTRUDED ABOVE ONE FACE OF THE PLATE FOR FORM KNOBS WITH THE OPPOSED INNER FACES THEREOF CURVED TO APPROXIMATE THE CONTOUR OF THE ROUNDED LATERAL EDGES OF THE TUBES, THE PLATE BEING ADAPTED FOR BONDING TO THE TUBE ENDS THROUGHOUT THE ENTIRE AREAS OF CONTACT THEREOF WITH THE RESPECTIVE FLAT PARALLEL AND ROUNDED END SUFFACES OF THE PLATE AND THE CURVED INNER FACES OF THE RESPECTIVE KNOBS.