Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1997-09-16
2000-04-18
Bryant, David P.
Metal working
Method of mechanical manufacture
Assembling or joining
29235, B23P 1102
Patent
active
060499605
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method and a device for sliding and positioning sleeve-shaped, elastic, radially expandable components on cylindrical or conical base bodies having a smallest outer diameter to be covered or enclosed which is greater than the non-expanded inner diameter of the sleeve-shaped component to be mounted. Preferably, the invention has as objective to slide such radially expandable, sleeve-shaped components on base bodies made from insulated cable wires or cable wire bundles prepared in a manner known per se.
An important field of application of the method according to the invention and of the device for implementing the method thus includes to slide and position components of cable fittings on base bodies in the form of cable ends or cable connections which have been prepared in a manner known per se for making insulated cable connections for single-conductor and three-conductor plastic cables carrying nominal voltages of about 30 kV.
Upon application of the method in the cable connection technique and cable insulation technique, the preferably employed, conventional expandable sleeve-shaped components are made for example from silicone rubber or EPDM and can be modified, depending on the application, with fillers in order to effect e.g. a field control or to increase the leakage current resistance. In particular, these components can also be constructed of several elastic layers, e.g. layers having a different conductivity and/or dielectric constant, and are used for assembling cable fittings, i.e. for providing an insulation at the ends of a cable in conjunction with cable terminations, cable plugs, as cable end caps, or as cable sleeves for insulation at the point of connection between two cable ends, and thus form part of a cable fitting set.
In these cases, the base body to be enclosed is an insulated cable wire or an insulated cable wire bundle, preferably from plastic cables with polyethylene insulation, with the outer sheath, including the so-called outer conductor layer, being removed, as is customary when the cable fittings are installed. If necessary, prior to sliding and positioning of the elastically expandable sleeve-shaped component, the insulating layer of the cable is provided with an enveloping layer which forms e.g. a barrier against escape of cable mass in paper insulated mass-impregnated cables.
Conventionally, when the sleeve-shaped components are fitted over and positioned on the cable ends prepared in a conventional manner, e.g. over a completed cable connection, the component is usually pulled by hand over the cable connection or cable end region, requiring a great exertion of force. In order to ensure that the cable connection, including the cable ends on both sides and the regions where the cable exits the cable sleeve, is sealed reliably, the inner diameter of the sleeve-shaped component in its relaxed state must be sufficiently smaller than the smallest outer diameter of the cable connection or cable end to be enclosed.
A potential problem, however, exists in that the prepared cable wire connections and the conductor cross sections can be very different in thickness and outer diameter, respectively. In order to ensure a tight enclosure with sufficient tension even at the thinnest regions at the ends of the cable wire connection and the conductor cross section, the sleeve-shaped component must be so dimensioned as to provide a sufficient enveloping force in the relaxed state also in these thin regions. Since the sleeve-shaped components are available with graduated dimensional sizes, it may happen that such a component is not wide enough even in the stretched state in order to allow easy sliding over the prepared cable connection; In these situations, which are typically carried out manually, the assembler is required to apply a significant force which increases with increasingly required expansion of the sleeve-shaped component.
The required force is also dependent on the material of which the components that move relative to one
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Haim Klaus-Dieter
Pilling Jurgen
Rotzsche Ralf
Weichold Jens
Bryant David P.
Cozart Jermie E.
Feiereisen Henry M.
Zittauer Kunststoff GmbH
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