Apparatus and method for pneumatically rodding multi-passage cable housing conduits
US4030702A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 26, 1976 |
| Grant date | Jun 21, 1977 |
| Priority date | — |
| Expiry date | Aug 26, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02G1/086
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Cable pull lines are pneumatically rodded through underground cable housing conduit comprising joined multipassage sections by attaching the free end of the pull lines to individual foam carriers inserted into each passage at one end of the conduit and forcing air through a manifold into said passages behind the foam carriers to simultaneously drive the carriers to the open exit end of the conduit. The pull lines have been previously uniformly wound on a reel and a brake is used to tension the reel as the pull lines unwind therefrom to keep the foam carriers in phase as they advance through the conduit and thereby to prevent air bypassing the leading foam carriers through gaps at the conduit section joints with resultant loss of driving pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.