Electricity: conductors and insulators – Conduits – cables or conductors – Single duct conduits
Patent
1996-11-12
1998-06-30
Kincaid, Kristine L.
Electricity: conductors and insulators
Conduits, cables or conductors
Single duct conduits
439460, 285162, 285322, H02G 318
Patent
active
057737584
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention concerns a device for assembly of a flexible cable in a cylindrical orifice enabling the cable to be gripped in the orifice so that it resists axial pulling forces. Among the applications of such a device, one particularly important one is in a high-voltage (HV) transformer in which the device can be used to secure HV cables to the transformer outputs.
BACKGROUND OF THE INVENTION
There exist many devices for attaching cables so that they are gripped and can resist accidental pulling forces. In the field of HV transformers, in particular those intended for use with cathode ray tubes (CRT), the HV outputs of the transformer (that provide the power supply, focusing voltage, etc.) are connected to other components via HV electrical cables. In the case of an HV transformer used with the CRT of a television, for example, the output voltage required to power the CRT is typically 25 to 30 KV, whereas the focusing voltage is 10 to 12 KV. To assure safety in use, the transformer must have projecting tubular parts, known as "chimneys", that prolong the insulating casing of the transformer and in which the HV output cables are inserted. To assure the electrical connection of the HV cables to the corresponding outputs of the HV transformer, cable assembly devices are included at the open ends of the chimneys.
An HV transformer in which the chimneys are associated with clipping devices intended to prevent pulling out of the cables is described in the European patent No. 0236 642. The clamping device has a small tapered collar that engages a pin within each chimney. Above the clamping collar, the device includes a rigid tubular extension that protrudes from the end of the chimney.
Another commonly-used solution, which will be described below with reference to FIG. 1, consists of a cable grip that is split axially and that has two lateral external protuberances half way along of the split section that engage holes n the chimneys. This solution requires the chimneys to be made longer in order o allow space for the cable grip.
Both the conventional techniques mentioned above have the disadvantage of increasing the overall size of the HV transformer, since the chimneys must be made longer than the strict minimum required for electrical safety reasons. In view of the increasing need for miniaturization of components, this is therein serious drawback. Furthermore, these techniques make the deliberate removal of the cable difficult, since axial extraction from the chimney of the HV transformer requires a large radial deformation of the cable.
SUMMARY OF THE INVENTION
The object of the present invention is a device for mechanical assembly of a flexible cable in a cylindrical orifice, including a cable grip member to hold the cable in the cylindrical orifice and prevent its being pulled out axially, wherein said cable grip member engages a thread in said cylindrical orifice, enabling the cable grip member to be clicked axially into the cylindrical orifice before the insertion of the flexible cable, but enabling the axial extraction of the flexible cable only by unscrewing the cable grip member from the orifice.
The cable assembly technique according to the invention can be used for all types of cable, electrical cable for example. It minimizes the additional space required by the assembly system, while enabling easy insertion of the cable in the cylindrical orifice, assuring excellent resistance of the cable to axial pulling forces, and enabling easy removal of the cable.
Another object of the invention is a compact HV transformer for which the fitting and removal of the cables in the chimneys is easy and rapid.
The device according to the invention provides for mechanical assembly of a flexible cable in a cylindrical orifice by means of a cable grip member that enables the cable in the cylindrical orifice to resist axial pulling forces. According to the invention, the cable grip member works in association with a threaded section in the cylindrical orifice that enables the cable grip m
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Coutureau Thierry
Tharradin Marguerite
Kincaid Kristine L.
Reichard Dean A.
Thomson Multimedia S.A.
Tripoli Joseph S.
Wein Frederick A.
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