Pipes and tubular conduits – Structure
Patent
1989-11-03
1991-07-02
Bryant, III, James E.
Pipes and tubular conduits
Structure
138108, 138121, 138173, 138DIG11, 174 683, 350 9623, F16L 1104, E21C 2916
Patent
active
050278649
ABSTRACT:
An inner duct is disclosed which can fit inside a duct and extend along a length thereof for receiving communication cable, particularly a light-guide cable. The inner duct has a continuous side wall with protruding ribs on the inside and outside surfaces to maintain an effective supply of lubricant during the installation of the inner duct and cable in the inner duct. The ribs on the inside surface of the inner duct guide the cable during the placement operation. It is preferred to install a plurality of inner ducts into a duct during which the ribs on the inner duct interlock with one another to prevent spiraling. The ribs also facilitate the dissipation of heat due to friction and ambient sources of heat.
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ARNCO Corporation brochure entitled "Suggested Procedures and Equipment for Placing Lightguide Cable", 1985.
Bell System Practices, AT&T Co Standard, "Innerduct Placing Underground", Section 628-200-215, Issue 1, Feb. 1981, Suggested Procedures and Equipment for Placing Lightguide Cable.
Conti Allen C.
Conti Armand R.
Arnco Corporation
Bryant III James E.
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