Method for installing cable using an inner duct
AssigneeArnco Corporation
InventorsAllen C. Conti, Armand R. Conti
Life of this patent
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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.
Claims20
A method for installing a transmission cable in a selected length of a duct comprising the steps of:
- selecting a length of an inner duct which can fit inside said duct, said inner duct having a wall surface with protruding ribs extending in the direction of the length of the inner duct,
- installing the inner duct inside the duct to extend along the length thereof, and
- installing a transmission cable in said inner duct.
A method for installing a transmission cable in a selected length of a duct comprising the steps of:
- selecting a bundle of inner ducts which can fit inside said duct, said inner ducts each having a wall surface with protruding ribs extending in the direction of the length of the inner duct,
- installing the bundle of inner ducts inside the duct, and
- installing a transmission cable in at least one inner duct of said bundle of inner ducts.
A method for installing a transmission cable in a duct comprising the steps of:
- extruding plastic material to form a length of an inner duct having a wall surface with protruding ribs extending in the direction of the length thereof to fit inside and extend along a selected length of said duct, and
- installing the inner ducts inside the duct to receive a transmission cable.
Dependencies are inferred from the claim text.