Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
2002-08-15
2003-12-02
Thompson, Gregory (Department: 2835)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C211S026000, C211S182000, C312S223100, C312S236000, C312S265300, C312S265500, C312S265600, C312S111000, C312S108000, C174S034000, C361S703000, C361S818000, C361S831000, C361S724000, C361S826000, C454S184000
Reexamination Certificate
active
06657861
ABSTRACT:
I. APPLICATION AREA
The invention relates to a distribution cabinet which is usually set up outdoors and accommodates the distribution installations for weak-current systems, for example telephone systems, with associated power-supply devices and cable-terminal/-connection devices for a certain area.
II. TECHNICAL BACKGROUND
Nowadays—in addition to having sufficient structural stability and resistance to vandalism, etc.—such distribution cabinets have to satisfy further requirements, for example excessive electromagnetic radiation must not be emitted to the surroundings, and, for use in warmer countries in particular, the temperatures in the interior of the distribution cabinet must not rise to too high a level, despite the heat-emitting electrical subassemblies accommodated there, nor must they drop to too low a level.
Such distribution cabinets are basically produced either from metal or from plastic, plastic combining the advantage of less expensive production with the advantage of an electrically non-conductive material, with the result that, even in the case of unplanned contact being established between the housing of the distribution cabinet and an electrical component, there is never a risk of a person who touches the housing from the outside receiving an electric shock.
As far as the sufficient cooling capability of such distribution cabinets is concerned, it is already known for cooling to be effected by air circulation. For this purpose—up until now only in the case of distribution cabinets consisting of sheet steel—the body is of double-walled configuration, it being possible for the ambient air to circulate in the interspace between the walls, that is to say to pass in at the bottom and to pass out at the top, as a result of which, on the one hand, the interior is heated up by the sunlight and, on the other hand, heat is dissipated on the inner wall, which are heated up by the electrical subassemblies in the main chamber.
Such a double-walled construction is indeed theoretically possible even in the case of distribution cabinets produced from plastic. However, on account of the greater wall thicknesses which are necessary in this case, and of the outer and inner dimensions being predetermined by standards in the various countries, this would result in excessively small free spaces on the inside and overall dimensions on the outside.
In addition, it is extremely important for such distribution cabinets not to exceed the admissible maximum value of electromagnetic radiation emitted to the outside, that is to say for the EMC (electromagnetic compatibility) to be ensured.
III. DESCRIPTION OF THE INVENTION
a) Technical Object
The object of the present invention is thus to provide a distribution cabinet and an assembly kit for producing such a distribution cabinet, the distribution cabinet consisting at least partially of plastic and nevertheless providing sufficiently good shielding against electromagnetic radiation, on the one hand, and a sufficient cooling capability, on the other hand.
b) Solution of the Object
This object is achieved by the features of claim 1. Advantageous embodiments can be gathered from the subclaims.
Up until now, distribution cabinets produced from plastic usually comprised a base box, which was usually open on the top side and also on the underside, since the underground cables were introduced into the base unit, a body, which was positioned on the base and on which one or two doors or flaps for opening the body were provided, for the purpose of installing or maintaining and checking the electrical units in the interior of the body, and a cover protecting the body, open on the top side, and one upward against rain and other influences, and usually positioned in a sealed manner.
It was additionally possible for the body to have a base plate as an integral or separate component which—apart from the through-passages for the cables—separated off the main chamber in the interior of the body from the base chamber.
A distribution cabinet according to the invention may be produced from these known components by the addition of an installation frame which is made up, in particular, of deflected sections of an endless profile. The specific integration of the profile makes it possible, on the one hand, to simplify the assembly to form a—three-dimensional—installation frame to a very considerable extent and, in addition, to facilitate the optional fitting of EMC shielding and/or the production of a double-shell wall of the distribution cabinet for ventilation and cooling purposes.
The profile here—as seen in cross section—preferably has an approximately rectangular cross section, in particular two continuous outer surfaces running at right angles to one another. The other two, inwardly oriented outer surfaces each have an insertion pocket which is open on the outside and is intended for the insertion of insertion panels, of which the insertion direction is arranged parallel to the continuous outer surfaces and which are preferably also arranged as far as possible in the outward direction in the profile side surface thereof.
This preferably produces a cross-sectionally continuous hollow-chamber profile in the inner corner of the profile, this stabilizing the profile, in particular when the cross-sectional shape of the hollow chamber has one or more recesses, preferably directed outward.
In the case of essentially constant wall thicknesses being provided, these recesses are produced, on the one hand, by the already mentioned insertion pockets and, on the other hand, by at least one, preferably precisely one further pocket
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, which extends parallel to one of the insertion pockets and is open in the outward direction, but has undercuts, preferably arranged symmetrically in relation to one another in both flanks. These undercuts are used for arranging embracing a groove nut therein.
This configuration makes it possible, on the one hand, for three such profile sections to be connected to one another relatively easily to form a three-dimensional corner connection:
This takes place by two profile sections being cut to length and mitered and positioned one against the other. This three-dimensional corner connection is secured by an angle which is pushed, by way of its legs, into the open ends—from the miter—of the undercut of the pocket and is fixed there by means of, for example, clamping screws or else is fastened on the outsides of the two profile sections.
Since this angle or a groove nut has a threaded bore in the direction of the third, as yet missing, angle profile, this third angle can be positioned flush on the first two angles, which are already connected to one another, and fixed against the angle or the groove nut by means of a clamping screw, which is arranged in the longitudinal direction of the pocket, and within this pocket of the third profile, and can be screwed into the threaded bore of the angle or of the groove nut. This clamping screw is secured in its longitudinal direction in the third profile with the aid of a transversely running threaded bolt arranged in a transverse bore or with the aid of other means.
All of the additional elements necessary for the corner connection are located within the cross section of the three corner-forming profile sections.
It is possible for the profile configuration, furthermore, to be used very easily in order to complete the installation frame, formed from the profile sections, in that appropriately cut-to-size insertion panels are inserted into the insertion pockets, with the result that the respective side of the installation frame is a more or less closed side, that is to say when the panels are continuous panels which do not have any through-passages.
If the EMC shielding is to be achieved by means of the insertion panels, these panels will consist of metal or will have metallic components as a coating or addition, if the panels themselves consist of plastic. In addition, an EMC seal is then preferably positioned between the edges of the panels and the grooves of the insertion pockets accommodating
Krone GmbH
McGlew and Tuttle , P.C.
Thompson Gregory
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