Electricity: conductors and insulators – Conduits – cables or conductors – Combined
Patent
1986-04-01
1988-01-05
Nimmo, Morris H.
Electricity: conductors and insulators
Conduits, cables or conductors
Combined
174 88C, 285161, H02G 1508
Patent
active
047177926
DESCRIPTION:
BRIEF SUMMARY
This invention relates to sealed jointing apparatus for use in the connection of conduit sections at a connection zone, and more specificially, but not necessarily, relates to a flexible hermetically sealed cable splice/jointing point.
The present invention will find particular use in the telecommunications and electric industrial fields. However it can also be used in gas or water pipe systems to enable greater flexibility in these systems.
Up until now, in telecommunication cable work with different types of cables, such as coaxial, fibre optical and multi-core, all types of cable closure method used the outside of the cable sheath for affixing the seal. Therefore the outer sheath of any cable had to enter into the area which would contain the conductor splices.
It has been well recognized within the electrical and telecommunication fields that this type of splice closure method often failed at the point of seal between the cable sheath and the main splice/joint sleeve, (referred to as the primary seal means) with the result that moisture could penetrate the joint thereby causing the failure of the contained circuits. In order to overcome these deficiences, the industries have used additional method steps which includes (1) air pressurization of the system and (11) splice/joint encapsulation using resins or jelly substances and oil filling of the splice area. These methods had the disadvantage of being expensive and labour intensive and in most cases the flexibility of the system was greatly impaired.
Also in this type of splice, the cables' aluminium screen had to be jumped across the splice by affixing a continuity wire to the butts of all cables contained within.
To enter previous straight through joints, cable seals have always had to be broken which again is expensive and time-consuming and depending on the size and type of cable very possibly a two-man operation.
It is an object of the present invention to obviate or mitigate these disadvantages and to provide a jointing point which can be both quickly entered and closed.
According to the present invention there is provided sealed jointing apparatus for use in the connection of conduit sections comprising an annular casing having open ends; spaced end closures at the end of the casing, and defining with the casing a connection zone into which conduit sections pass for jointing; and releasable securing means for releasably securing at least one of the end closures to the casing; said releasable securing means comprising an end cap including two radially spaced coupling threads, one of which coupling thread threadingly engages an external thread on the casing while the other coupling thread engages an internal thread on said one end closure whereby the casing is releasably coupled to said one end closure.
By means of the present invention, the conductor splices in joined telecommunication cable sections can be contained in a hermetically sealed zone bounded by the end closures and the casing, and access can be had to the cable splices simply by releasing the releasable securing means and pushing the casing aside: the end closure means remain in position and the primary seal means which are provided at the end closure are untouched. Closure of the joint simply comprises the reverse of this operation. It will be understood that such access without breaking the cable seal (i.e. the primary seal) provides considerable operational and economic advantages.
In a preferred embodiment, the end closure comprises at least one and preferably two annular members associated with a respective conduit section. Preferably, the or each annular member includes a rigid axially-extending auxiliary sleeve arranged such that there is formed in the annular member a closed-bottom annular slot to receive an end part of a telecommunication cable sheath, with the sleeve located between the sheath and a core part of the cable, so that functionings of the said primary seal means is facilitated. The sleeve can be of metal and can be used to provide screen continuity for the teleco
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Hay George M.
Sterritt James L.
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