Apparatus and method for pneumatically rodding multi-passage cab

Details Apparatus and method for pneumatically rodding multi-passage cab Apparatus and method for pneumatically rodding multi-passage cab

1976-08-26

1977-06-21

Smith, Al Lawrence

Implements or apparatus for applying pushing or pulling force

Method or apparatus for placement of conductive wire

By fluid pressure differential in conduit

B65H 5900

Patent

active

040307026

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.

REFERENCES:
patent: 1851435 (1932-03-01), Jessup
patent: 2188959 (1940-02-01), Schaer
patent: 2515953 (1950-07-01), Dufresne
patent: 2661187 (1953-12-01), Dailey
patent: 3244403 (1966-04-01), Ensley
patent: 3363879 (1968-01-01), Irik

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