Double-walled spiral pipe
US6186182A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 1, 1999 |
| Grant date | Feb 13, 2001 |
| Priority date | — |
| Expiry date | Oct 1, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M35/10137
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A double-walled spiral pipe in accordance with the present invention is composed of an outer wall 10 having a cylindrical shape, which is prepared by winding spirally a coated steel plate 11 having corrugations 12; and an inner wall 20 having a cylindrical shape, which is contacted with the wave bottom of corrugations of said outer wall 10, and can contracted or elongated depending upon a change of the pitch of the corrugations of said outer wall 10. The inner wall 20 having a cylindrical configuration is installed to be contacted with the wave bottom of corrugations of the outer wall 10, and functions to drain a sewage, etc. The inner wall 20 has a semi-circular portion which is formed at the point of the wave bottom of the corrugations of the outer wall, and a plane surface is formed between the semi-circular portions. Accordingly, although corrugations 12 of the outer wall 10 can be easily deformed depending upon a sectional load or soil pressure or heat, by which a pitch of the corrugations 12 can be wide or narrow, the semi-circular portion 22a of the inner wall 20 is flattened, thereby the inner wall 20 is prevented from a damage or breakage caused by outer factors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.