Method of manufacturing water cooled exhaust manifolds

Claim 1

THE METHOD OF MANUFACTURING CURVED WATER COOLED MARINE EXHAUST MANIFOLDS COMPRISING, LAYING OUT THE OUTLINE OF A PATTERN OF THE DESIRED CURVED SHAPE ON A FLAT SHEET OF METAL, CUTTING THE BLANK PATTERH FROMTHE SHEET, FORMING A LENGTHWISE EXTENDING ARCUATE HALF SHELL FROM SAID BLANK BY A DIE PRESSING OPERATION ADAPTED TO MAINTAIN THE THICKNESS OF THE ARCUATE HALF SHELL CONSTANT THROUGHOUT ITS ENTIRE LENGTH, FORMING A SECOND CURVED BLANK OF IDENTICAL CONFORMATION INTO A COMPLEMENTARY LENGTHWISE EXTENDING ARCUATE HALF SHELL, PLACING THE TWO HALF SHELLS TOGETHER WITH THEIR OUTER EDGES IN CONTACT AND WELDING SAID EDGES TOGETHER THROUGHOUT THEIR LENGTH TO FORM A LEAKPROOF CURVED INNER TUBE FOR THE EXHAUST GASES OF A WATER COOLED MANIFOLD, FORMING TWO LAGER HALF SHELLS CONFORMING IN SHAPE AND CONTOUR TO THE FIRST NAMED HALF SHELLS SAID SECOND HALF SHELLS ALSO FORMED IN A MANNER TO PRODUCE A HALF SHELL OF CONSTANT THICKNESS THROUGHOUT ITS ENTIRE LENGTH, PLACING SAID LARGER SECOND HALF SHELLS TOGETHER WITH THEIR EDGES IN CONTACT SURROUNDING THE FIRST FORMED INNER TUBE AND WELDING THEM TOGETHER TO FORM A LARGER OUTER WATER JACKET TUBE, WELDING THE EXTREME END EDGES OF THE INNER EXHAUST GAS TUBE TO A END EDGES OF OUTER SURROUNDING WATER JACKET TUBE TO A MOUNTING BRACKET IN A MANNER WHEREBY THE INNER AND OUTER TUBES WILL BE EQUALLY SPACED APART TO FORM A PASSAGE THEREBETWEEN FOR THE WATER COOLANT SURROUNDING THE INNER EXHAUST TUBE.

Claim 2

THE METHOD OF MANUFACTURING CURVED WATER COOLED MARINE EXHAUST MANIFOLDS COMPRISING, LAYING OUT THE OUTLINE OF A PATTERN OF THE DESIRED CURVED SHAPE ON A FLAT SHEET OF METAL, CUTTING THE BLANK PATTERH FROMTHE SHEET, FORMING A LENGTHWISE EXTENDING ARCUATE HALF SHELL FROM SAID BLANK BY A DIE PRESSING OPERATION ADAPTED TO MAINTAIN THE THICKNESS OF THE ARCUATE HALF SHELL CONSTANT THROUGHOUT ITS ENTIRE LENGTH, FORMING A SECOND CURVED BLANK OF IDENTICAL CONFORMATION INTO A COMPLEMENTARY LENGTHWISE EXTENDING ARCUATE HALF SHELL, PLACING THE TWO HALF SHELLS TOGETHER WITH THEIR OUTER EDGES IN CONTACT AND WELDING SAID EDGES TOGETHER THROUGHOUT THEIR LENGTH TO FORM A LEAKPROOF CURVED INNER TUBE FOR THE EXHAUST GASES OF A WATER COOLED MANIFOLD, FORMING TWO LAGER HALF SHELLS CONFORMING IN SHAPE AND CONTOUR TO THE FIRST NAMED HALF SHELLS SAID SECOND HALF SHELLS ALSO FORMED IN A MANNER TO PRODUCE A HALF SHELL OF CONSTANT THICKNESS THROUGHOUT ITS ENTIRE LENGTH, PLACING SAID LARGER SECOND HALF SHELLS TOGETHER WITH THEIR EDGES IN CONTACT SURROUNDING THE FIRST FORMED INNER TUBE AND WELDING THEM TOGETHER TO FORM A LARGER OUTER WATER JACKET TUBE, WELDING THE EXTREME END EDGES OF THE INNER EXHAUST GAS TUBE TO A END EDGES OF OUTER SURROUNDING WATER JACKET TUBE TO A MOUNTING BRACKET IN A MANNER WHEREBY THE INNER AND OUTER TUBES WILL BE EQUALLY SPACED APART TO FORM A PASSAGE THEREBETWEEN FOR THE WATER COOLANT SURROUNDING THE INNER EXHAUST TUBE.