Pipe coupling
US4416474A · kind A · utility
4Cited by
4References
10Claims
0Family size
Inventors
Key dates
| Filing date | Jan 12, 1981 |
| Grant date | Nov 22, 1983 |
| Priority date | — |
| Expiry date | Jan 12, 2001 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L21/08
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A section of corrugated pipe is provided having complementary bell and spigot end portions, the bell end portion being longitudinally segmented and having integrally formed flexible side wall strips connected to and projecting from a substantially cylindrical shroud. The spigot end portion of each section is receivable within the bell end portion, and an annular recess is formed in the exterior surface for receiving the side wall strips of another section when connected therewith. A plastic liner extends through each pipe section with sealing means provided to form a continuous, smooth inner conduit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.