Plastic tube formed by spiral winding of a snap locking profile strip
AssigneePont-A-Mousson S.A.
InventorsMichel Langenfeld, Andre Lagabe
Life of this patent
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Abstract
A profile strip 1 is composed of a rectangular cross-sectional body 2 having on each edge a recessed fastening means 3, 4, one male and the other female. Each fastening means 3-4 comprises an axial support flange 10, 13 which lengthens one of the exterior and interior surfaces 5, 6 of the body 2. The two adjacent flanges are abutting, and the two fastening means when engaged define, with the adjacent sides 7 of the body, a U-sectioned space which is filled by a border insert 16 having a complementary cross-section. The invention enables large diameter tubes of plastic material to be formed without any internal or external projections.
Claims6
A tube of plastic material formed by spirally winding a profile strip comprising a rectangular cross-sectional body (2) having a recessed fastening means on each edge, one male and the other female, wherein each fastening means (3, 4) comprises an axial support flange (10, 13) which lengthens one of the exterior (5) and interior (6) surfaces of the body, said axial support flanges (10, 13) both extending from the same surface of said body, two adjacent flanges abutting one another and two fastening means when engaged defining with adjacent sides (7) of the body a U-sectioned space, and a border insert (16) having a complementary cross-section filling said space and operating to lock said fastening means together.
Dependencies are inferred from the claim text.