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US 3,979,808 AGranted
Method of continuously processing metal bands into hollow rails
AssigneeRapena Patent- und Verwaltungs AG
InventorsRaimund Falkner, Heinz Grune
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AssigneeRapena Patent- und Verwaltungs AG
InventorsRaimund Falkner, Heinz Grune
Estimating the term…
A method of continuously processing two bands of material into profiled rails, inserting insulating material adjacent their lateral longitudinal borders, and then connecting their lateral longitudinal borders through the insulating material. Initial corrugations are formed in each of the bands, and the bands are simultaneously passed between rotating pairs of forming rolls. The initial corrugations formed in the bands are increased so that the length of each enveloping line of each part of each band is longer than the enveloping line contemplated for the corresponding part. The longitudinal border of one of the rails is provided with projections, and the border of the other rail is provided with openings. Finally, the longitudinal border provided with projections is bent around the other longitudinal border, and its projections are forced through the strip of insulating material into the openings of the other longitudinal border. A tenoned folder connection of the longitudinal borders which is free from metallic contact between the rails is thus created.
A method of continuously processing two bands of material by pairs of forming rolls into two profiled rails and connecting their lateral longitudinal borders, inserting strips of insulating material and producing folded welts to make a hollow rail, the said bands of material being simultaneously passed between rotating pairs of forming rolls while first being corrugated in various areas to facilitate the subsequent profiling operations, characterized in that the corrugations are increased until their enveloping lines transversely to the band of material are longer than the enveloping line of the longitudinal profile contemplated in the area involved, that of the longitudinal borders of the two profiled rails contemplated for a folded connection each, one is provided with openings and the other with lug-type projections, and that these longitudinal borders are then forced together, the longitudinal border provided with projections being bent around the other longitudinal border and having its projections forced through the insulating strip of material into the openings of the other longitudinal border so as to create a tenoned folded connection of the longitudinal borders which is free from metallic contact between the rails.
A method of continuously processing two bands of material by pairs of forming rolls into two profiled rails and connecting their lateral longitudinal borders, inserting strips of insulating material between the lateral borders of the rails and producing folded welts to make a hollow rail, the said bands of material being simultaneously passed between rotating pairs of forming rolls while first being corrugated in various areas to facilitate the subsequent profiling operations, characterized in that the corrugations are increased until their enveloping lines transversely to the band of material are longer than the enveloping line of the longitudinal profile contemplated in the area involved, a directrix is determined on at least one of said bands of material, said directrix coinciding with a marked longitudinal edge of the completely profiled rail, the first area of said one band of material extending from one outside edge to said directrix is largely held in its initial position during successive forming steps while the second area extending from the other outside edge ot the said directrix is twisted about said directrix relative to its initial position during said consecutive forming steps so that the said other outside edge performs a swinging motion, and the border tensile stress is reduced.
Dependencies are inferred from the claim text.