Spiral ribbed pipe
US4630650A · kind A · utility
21Cited by
10References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 15, 1984 |
| Grant date | Dec 23, 1986 |
| Priority date | — |
| Expiry date | Oct 15, 2004 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L11/16
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A spiral ribbed pipe formed from an elongate strip coiled helically. The pipe has a helical seam and an integral reinforcing rib formed along and around the seam, thereby increasing strength and rigidity of the pipe and its seam. The helical seam comprises a pair of interlocking edges located radially inward of the rib and intermediate a pair of offsets, whereby the inner surface of each coil of strip is longitudinally aligned with the surfaces of adjacent coils to provide a smooth interior pipe surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.