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AssigneeVobau Artur Baston Gesellschaft fur Vorrichtungsbau mit Beschrankter Haftung
InventorsArtur Baston, Karl-Heinz Baston
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For the production of a hollow cylindrical body, for example a tube or a container, first a bottom channel (1) is wound spirally onto a mandrel. A top channel (2) is wound on to the bottom channel (1) offset by half the channel width. The top and bottom channel (1, 2) both have an approximately E-shaped cross section with two outside flanges (3, 4) and two middle flanges (5, 6). The distance between the two middle flanges (5, 6) correspond to the combined thicknesses of the two outside flanges (3, 4). The confronting surfaces (7, 8) of the two outside flanges (3, 4) and of the two middle flanges (5, 6) are provided with a sawtooth cross-sectional shape, so that an inseparable, interlocking connection results between the bottom channel (1) and the top channel (2). The bottom channel (1) and top channel (2) can consist of different plastic materials.
A hollow body comprising a bottom spirally wound channel having turns with adjacent side walls lying closely against each other, and a top spirally wound channel inter-engaged with said bottom channel, said top channel having turns with adjacent side walls lying closing against each other, said top and bottom channels each having an E-shaped cross section with a base web having two outer limbs each carrying one of the side walls of the channel, and two spaced apart middle limbs, said two middle limbs of one channel being spaced apart by a distance to closely receive the outer limbs of two adjacent turns of the other channel, said two middle limbs of one channel having inner side surfaces which engage inner side surfaces of the outer limbs of two adjacent turns of the other channel.
Dependencies are inferred from the claim text.