Electricity: conductors and insulators – Conduits – cables or conductors – Combined
Patent
1997-07-22
1999-03-16
Reichard, Dean A.
Electricity: conductors and insulators
Conduits, cables or conductors
Combined
H02G 1508
Patent
active
058833331
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
The present invention relates to a cable splice closure, for example for telecommunications or electrical cables. The invention also relates to a device for gripping a cable, which device may, for example, form part of a cable splice closure. Although the invention is particularly applicable to the splicing and gripping of cables (including copper wire cables, optical fibre cables, wires, and optical fibres), at least some embodiments of the invention may be applicable to the splicing and gripping of pipes (especially district heating pipes) or other elongate objects. Hence, even though, throughout the specification, cables are referred to, it is to be understood that pipes or other elongate objects may, at least in some embodiments of the invention, be substituted for cables.
INTRODUCTION TO THE INVENTION
Many different types of cable splice closures are known. For example, International Patent Application published under the number WO 93/26070 (Raychem) discloses a cable sealing device (e.g. a cable splice closure) which comprises a housing into which the cable passes, a sealing material that seals a gap between the cable and the housing, and means for transmitting an axial force in the cable to the housing other than through the sealing material, the means allowing substantially radial movement of the cable. In preferred embodiments of the cable sealing device, the axial force transmitting means comprises a transverse member having substantially radially-extending slots within which cable clamps in the form of hose clamps or jubilee clips can slide.
European patent application no. 0538008 discloses a cable splice enclosure comprising first and second elongate casings which define a housing which is filled with an encapsulant. An end plate assembly is located at each end of the housing, and comprises a base plate and a cover plate. Each end plate assembly defines cable-receiving recesses of generally U-shaped configuration into each of which a cable seal formed from resilient material (e.g. thermoplastic rubber) is inserted. In order to form a seal between each cable seal and its respective cable extending through it, the base plate and the cover plate are forced towards each other by tightening nuts on bolts connecting the two plates, which has the effect of compressing the cable seals. Strain-relief for the cables may be provided by a central support extending longitudinally from each end plate, the support having concave arcuate portions which have teeth to penetrate the insulation of cable jackets under the influence of a clamp tightened around the support and the cables.
U.S. Pat. No. 4,387,268 discloses a sleeve for protecting a splice of electric or telephone cables, which is made up of two half-shells joined together by their adjacent edges around the splice. These adjacent edges are provided with a groove which, when the half-shells are joined together, defines a duct into which pasty material (self-curing silicone or polyurethane elastomer) can be injected in order to create water-tightness between the edges. The opposite ends of the sleeve are provided with detachable jaws for securing axially the ends of the cables to the sleeve. Between at least two such detachable jaws is a chamber connected with the duct.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a cable splice closure and a device for gripping a cable which are simpler than known closures and gripping devices such as the closures disclosed in WO 93/26070, EP 0538008 and U.S. Pat. No. 4,387,268 and which consequently may be easier to manufacture and, more importantly, easier to install. It is a further object of the invention to provide such simplified closures and devices substantially without detriment to the mechanical and environmental protection provided to cables and splices around which they are installed, and preferably to improve such mechanical and environmental protection. A particular object of the invention is to provide simple yet eff
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Damm Jesper
Laeremans Etienne
Wambeke Alain
Burkard Herbert G.
N.V. Raychem S.A.
Reichard Dean A.
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