Art of producing expandable laminate strips with use of flattened tubes for cores

Claim 1

THE METHOD OF MAKING TUBULAR BODIES OF PREDETERMINED INTERNAL DIMENSIONS, WHICH COMPRISES PREPARING A HOLLOW CORE OF OBLONG CROSS-SECTION OF A METAL COMPATIBLE WITH THE METAL FOR FORMING THE MAJOR PORTIONS OF THE BODY STRUCTURE, THE INTERIOR OF THE CORE HAVING ACCURATELY PREDETERMINED CROSS-SECTIONAL DIMENSIONS, PROVIDING COATINGS OF FIRST ANTI-WELD MATERIAL AT THE EXTERIOR EDGES OF THE CROSS-SECTION OF THE HOLLOW CORE, MOUNTING THE CORE IN A MOLD AND CASTING SAID MAJOR BODY METAL AROUND THE CORE FOR WELDING UNION THEREWITH AND THEREBY FORMING A HOLLOW INGOT WITH THE SAID COATINGS EXTENDING IN PARALLELISM WITH AND SPACED FROM THE CHANNEL PROVIDED BY THE INTERIOR OF THE CORE, PROVIDING SECOND ANTI-WELDING MATERIAL IN THE CHANNEL OF THE INGOT, ROLLING THE INGOT TO PROVIDE A STRIP HAVING METAL LAMINATIONS OF SAID MAJOR BODY METAL SEPARATED BY THE RESIDUE OF THE SECOND ANTIWELDING MATERIAL WITH THE LAMINATIONS CONNECTED AT THE LATERAL EDGES OF THE SECOND ANTI-WELDING RESIDUE BY METAL PORTIONS EXTENDING FROM EXTERNAL SURFACE TO EXTERNAL SURFACE OF THE STRIP AND HAVING THE RESIDUES OF SAID FIRST ANTIWELDING MATERIAL LATERALLY SPACED FROM THE RESIDUE OF THE SECOND ANTI-WELDING MATERIAL, SAID RESIDUES OF THE FIRST MATERIAL PROVIDING LONGITUDINAL WEAKNESSES IN THE ROLLED STRIP, SEVERING THE STRIP LONGITUDINALLY ALONG THE RESIDUES OF THE FIRST MATERIAL, SEVERING THE STRIP TRANSVERSELY TO PROVIDE A SECTION OF PREDETERMINED LENGTH, AND BENDING THE LAMINATIONS APART TO FORM THE TUBULAR BODY.

Claim 2

THE METHOD OF MAKING TUBULAR BODIES OF PREDETERMINED INTERNAL DIMENSIONS, WHICH COMPRISES PREPARING A HOLLOW CORE OF OBLONG CROSS-SECTION OF A METAL COMPATIBLE WITH THE METAL FOR FORMING THE MAJOR PORTIONS OF THE BODY STRUCTURE, THE INTERIOR OF THE CORE HAVING ACCURATELY PREDETERMINED CROSS-SECTIONAL DIMENSIONS, PROVIDING COATINGS OF FIRST ANTI-WELD MATERIAL AT THE EXTERIOR EDGES OF THE CROSS-SECTION OF THE HOLLOW CORE, MOUNTING THE CORE IN A MOLD AND CASTING SAID MAJOR BODY METAL AROUND THE CORE FOR WELDING UNION THEREWITH AND THEREBY FORMING A HOLLOW INGOT WITH THE SAID COATINGS EXTENDING IN PARALLELISM WITH AND SPACED FROM THE CHANNEL PROVIDED BY THE INTERIOR OF THE CORE, PROVIDING SECOND ANTI-WELDING MATERIAL IN THE CHANNEL OF THE INGOT, ROLLING THE INGOT TO PROVIDE A STRIP HAVING METAL LAMINATIONS OF SAID MAJOR BODY METAL SEPARATED BY THE RESIDUE OF THE SECOND ANTIWELDING MATERIAL WITH THE LAMINATIONS CONNECTED AT THE LATERAL EDGES OF THE SECOND ANTI-WELDING RESIDUE BY METAL PORTIONS EXTENDING FROM EXTERNAL SURFACE TO EXTERNAL SURFACE OF THE STRIP AND HAVING THE RESIDUES OF SAID FIRST ANTIWELDING MATERIAL LATERALLY SPACED FROM THE RESIDUE OF THE SECOND ANTI-WELDING MATERIAL, SAID RESIDUES OF THE FIRST MATERIAL PROVIDING LONGITUDINAL WEAKNESSES IN THE ROLLED STRIP, SEVERING THE STRIP LONGITUDINALLY ALONG THE RESIDUES OF THE FIRST MATERIAL, SEVERING THE STRIP TRANSVERSELY TO PROVIDE A SECTION OF PREDETERMINED LENGTH, AND BENDING THE LAMINATIONS APART TO FORM THE TUBULAR BODY.