Electricity: conductors and insulators – Conduits – cables or conductors – Single duct conduits
Patent
1979-04-18
1981-03-17
Tolin, Gerald P.
Electricity: conductors and insulators
Conduits, cables or conductors
Single duct conduits
174151, 174 23R, 248 56, H02G 322
Patent
active
042569206
ABSTRACT:
A re-entrable duct is provided through which a cable is adapted to penetrate a wall, e.g., of an environmentally controlled manhole. The re-entrable duct includes a duct pipe, e.g., a length of steel pipe, through which the cable passes. A resilient annular plug having a central aperture through which the cable passes, e.g., a so-called split rubber duct plug, is situated at each end of the duct pipe. The annular plugs with the duct pipe define a sealant chamber. A quantity of bentonite is provided which substantially fills the sealant chamber. A sleeve is secured to one end of the duct pipe adjacent one such split rubber duct plug, that sleeve including an end plate having a central aperture therethrough which the cable passes. The cable is thus secured within the central aperture in a circumferential, hermetic sealed manner, thereby defining a secondary sealed air chamber between the split rubber duct plug and the end plate. Finally, a crimpable tube is disposed within, and projects from the central aperture in the end plate, and is crimped into hermetically sealed contact onto the cable. Together, the three components of the re-entrable duct seal provide a three-stage seal against moisture and at least a one-stage seal against gas. All components can be re-entered if necessary, and all may be placed from one end of the steel duct pipe only.
REFERENCES:
patent: 1460698 (1923-07-01), Berry
patent: 1851940 (1932-03-01), Williams
patent: 2276969 (1942-03-01), Heinichen
patent: 3347974 (1967-10-01), Arendt
patent: 3970783 (1976-07-01), Lukas
Ayres Rand K.
Sherif Hassan A.
Northern Telecom Limited
Tolin Gerald P.
Tone D. A.
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