Plastic tube formed by spiral winding of a snap locking profile strip
US4301200A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 5, 1980 |
| Grant date | Nov 17, 1981 |
| Priority date | — |
| Expiry date | Sep 5, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24744
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.