Electricity: conductors and insulators – Conduits – cables or conductors – Combined
Patent
1995-06-21
1997-03-11
Kincaid, Kristine L.
Electricity: conductors and insulators
Conduits, cables or conductors
Combined
174 92, 174 93, H02G 15113
Patent
active
056103700
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a closure for coaxial cables or the like in CATV or other wide-band communications networks, having a special cable gripper and preferably having a body that can form an environmental seal around cable inlets and cable outlets, and electronics such as a printed circuit board or other means mounted inside the sleeve body having branch circuit connections for splicing and/or splitting a CATV or other signal. The attenuation of the branch circuit connections can preferably be changed.
SUMMARY OF THE INVENTION
Thus, the invention provides a closure for a cable joint having a cable inlet having a cable gripper that can provide strain relief to a cable within the inlet, the cable gripper being adjustable to grip cables of different diameters n such a way that the position of the center line of a gripped cable is substantially independent of cable diameter.
The cable gripper preferably comprises at least two first sections and at least one second section, the first and second sections each having a cable gripping surface which is preferably convex and which surfaces together approximate to a cylinder within which the cable can be received, in which movement of the second section towards the first sections causes the first sections to move towards one another.
The first sections are preferably resiliently biased apart, and the second section preferably may be moved towards and away from the first sections by means of a screw-thread.
The second section may be pivoted relative to the first sections to split the cylinder preferably facilitating entry of a cable, for example transversely.
The closure of the invention preferably has a sealing material such as a gel, a mastic or an elastomer at the inlet, and preferably has a base and a cover, the cable gripper being provided in the base and the inlet being defined partly in the base and partly in the cover.
The closure is preferably a CATV splitter box and has means for electrical connection to inner and outer conductors of a coax cable when that cable is positioned in the inlet, together with electronic circuitry or other means for splitting a CATV signal.
In a wide-band communications network of this kind, the signal strength made available to the individual end subscriber is determined by the attenuation of the splicer/splitter through which the signal is de-coupled from the main circuit. Splicers/splitters with varying attenuation are required due to varying network structures. Thus, for example, the telecommunications authority of the Federal German Post Office uses splicers/splitters in their wide-band communications networks with three different attenuations, namely 10, 15 and 20 dB.
Preference may be made to a device of this type disclosed in DE-40 04 811-Al , which is designed in such a way that the attenuation can be adjusted for any application, and a suitable path can be selected, depending on the attenuation desired. A heat-shrinkable sheath is provided as an external covering for the electronics.
A disadvantage of that device is, however, that suitable electronics must be provided to allow for any desired attenuation. It has also been shown that the technical effort required to provide every individual outlet of the tap with every attenuation value required is very great, and not justifiable from the economic point of view.
An enclosure of the type described above, may have a closure body or housing formed so that it can be opened and tightly closed again, and may have a printed circuit board with a line disconnection for every tap, each mating with a socket, a replaceable modular transfer element being inserted into the socket, provided with corresponding plug connections and having a pre-set selectable attenuation. The closure may comprise a heat-shrinkable or other sleeve.
With such a closure it is possible to connect each tap simply on site at the required attenuation, by opening the closure if necessary, then determining the required attenuation, for example by measuring the main circuit, and t
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patent: 4919372 (1990-04-01), Twist et al.
patent: 4988834 (1991-01-01), Birch
patent: 5021006 (1991-06-01), Fargeaud et al.
patent: 5124507 (1992-06-01), Dehling
patent: 5162772 (1992-11-01), May
Fremgen Dieter
Vock Frank
Burkard Herbert G.
Kincaid Kristine L.
Nguyen Chau N.
Raychem GmbH
Zahrt II William D.
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