Control box with a frame structure

Details Control box with a frame structure Control box with a frame structure

1998-04-21

1999-10-26

Cuomo, Peter M.

Supports: cabinet structure

Knockdown or setup type

Skeletal frame

312400, 3122655, A47B 4700

Patent

active

059715111

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
This invention relates to a switchgear cabinet with a rack, which is assembled from individual frame legs or is formed by individual frame legs bent off at the side walls, wherein the open, vertical sides of the rack are closed off by side walls and a rear wall, which are fastened on the facing frame legs of the rack, and wherein a cabinet door is hinged on the two vertical frame legs of the front of the rack and can be stopped in the closed position.
2. Description of Prior Art
Switchgear cabinets of this type are taught by German Patent Publication DE 33 44 598 C1 and German Patent Publication DE 37 31 547 A1. These publications teach that the interior of the switchgear cabinet is covered on all sides by a wall element which is employed as a rear wall, side wall or cabinet door. In this case, the joints between neighboring wall elements are a particular weak spot whereby forced access to the interior of the switchgear cabinet is possible. For switchgear cabinets placed outdoors, the built-ins in the switchgear cabinet are not sufficiently protected against vandalism.
A weather-proofed switchgear cabinet with a removable protective hood, which is maintained spaced apart from the connecting surfaces of the switchgear cabinet, is disclosed by German Patent Publication DE 295 19 260 U1.
A switchgear cabinet with double walls, which are insulated against each other by mineral wool, is taught by German Patent Publication DE 92 02 819 U1.


SUMMARY OF THE INVENTION

It is an object of this invention to provide a switchgear cabinet of the type discussed hereinabove whereby forcible access to the built-ins in the interior is made considerably more difficult.
This and other objects are attained by a switchgear cabinet in accordance with this invention in which the rear wall and the two side walls are covered by protective walls spaced apart therefrom and are connected to the facing vertical frame legs of the rack. The cabinet door is made of double walls wherein the inner door wall is at a distance from the outer door wall and forms receptacle spaces for seals, hinges and locking elements free in the direction of the vertical edges of the outer door wall. The protective walls of the side walls are beveled, at least in the area of their vertical edges, such that they cover the free spaces between the protective wall of the rear wall and the rack and the receptacle spaces between the outer door wall and the rack and, therefore, their fastening points.
In this way, a double wall, formed by the wall element and the protective wall is always obtained in the area of the vertical sides of the rack, without complicating the components and increasing the assembly effort for the switchgear cabinet. The fastening points at all joints are covered and not accessible. In addition, the joints essentially present the use of tools for forcibly removing the protective wall from the rack. In this way, the switchgear cabinet is sufficiently secured against vandalism.
An increased protection against rain and water spray is also achieved by this design, since the sealing elements are moistened. Furthermore, an increased HF protection is achieved as a result of this geometry.
In order to also provide protection for the underside and the top of the switchgear cabinet, in accordance with one embodiment of this invention, the underside of the rack is connected to a base. In accordance with one embodiment of this invention, an additional housing, for example for an air conditioner, is fastened on the top of the rack, which can also be double-walled.
The attachment of the protective wall in the area of the rear wall is achieved in accordance with one embodiment of this invention in such a way that the protective wall for the rear wall has, in the area of its beveled vertical sides, connecting bolts attached on its inside, which are screwed together with a profile side of the facing vertical frame legs of the rack. For fastening the rear wall, the rear wall has edges beveled in an L-shape

REFERENCES:
patent: 3856374 (1974-12-01), Christen
patent: 5171079 (1992-12-01), Bayerle
patent: 5388903 (1995-02-01), Jones et al.
patent: 5536079 (1996-07-01), Kostic

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