E - Fixed Constructions – 04 – C
Patent
E - Fixed Constructions
04
C
248/17, 277/40,
E04C 2/52 (2006.01) F16L 5/02 (2006.01) H01B 17/30 (2006.01) H02G 3/08 (2006.01) H02G 9/10 (2006.01)
Patent
CA 1101820
ABSTRACT OF THE DISCLOSURE 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 and is adapted to surround the cable. 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 through which the cable passes. The cable is thus secured within the central aperture in a cir- cumferential, hermetic sealed manner, thereby defining a secondary sealed air chamber between the splitrubber duct plug and the end plate. Finally, a crimpable tube is disposed within, and projects from, the central aper- ture in the end plate, and is crimped into hermetically selaed 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.
325852
Ayres Rand K.
Sherif Hassan A.
Innovate Llp
Northern Telecom Limited
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