Supports: cabinet structure – Knockdown or setup type – Skeletal frame
Reexamination Certificate
1999-05-18
2001-01-16
Cuomo, Peter M. (Department: 3624)
Supports: cabinet structure
Knockdown or setup type
Skeletal frame
C211S026000
Reexamination Certificate
active
06174034
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a switching cabinet with a rack which has a lower and upper frame with horizontal width and depth struts wherein the lower and the upper frame have corner cavities wherein vertical frame profiles can be attached and wherein the vertical frame profiles have profiled parts turned toward the inside of the rack.
2. Description of Prior Art
Such a frame is known from European Patent Reference EP 0 533 555 B1. The vertical frame profiles are formed as hollow profiles. To form a rack individual frame profiles are assembled adjacent to one another at ends by corner connectors. The corner connectors have various individual parts. Each pair of depth and width struts of the lower and upper frame are connected perpendicularly to one another of one of these individual parts. Additional individual parts are installed in the hollow chambers with connecting plugs running in the longitudinal direction of the frame profiles and fixedly connected to the frame profiles. To complete the corner connection the vertical frame profiles are then screwed onto the individual parts of the lower and upper frame with their individual parts mounted on the end side.
This type of the corner connection is very expensive. For the individual connectors a high production cost is necessary. The individual parts of the connector must be matched precisely with one another in order to insure that the individual frame profiles are aligned perpendicularly to one another. Also the expenditure for mounting is significant since all the vertical frame profiles and the depth and width struts are equipped with the individual parts of the connector.
Still other racks are known in which connectors have three connecting plugs perpendicular to one another. The connecting plugs can be plugged into hollow chambers of the vertical frame profiles and the lower and upper struts. With these connectors rigid connections are in fact generated in the corner of the rack. However, it is not possible to mount or dismount the vertical frame profiles afterwards without the entire rack having to be disassembled in the process. The dismounting of a frame profile can, for example, be required in order to simplify access to the inside of the rack.
SUMMARY OF THE INVENTION
It is one objective of this invention to provide a switching cabinet of the type mentioned initially in which the vertical frame profiles can be mounted on the rack or dismounted from the rack with little expenditure on parts or mounting.
This objective of this invention is accomplished with vertical frame profiles that can be pushed at ends by their profile parts into corner cavities from an outer side of the rack at least on one side of the rack and the profile parts can be placed on and affixed to a connector of the corner cavity.
The corner cavity is formed so that the vertical frame profile can be mounted or dismounted from it on a rack already placeably mounted. Thereby no additional individual parts mounted on the vertical frame profile are needed since fastening of the frame to the connector profile follows directly.
According to a preferred embodiment of this invention, the vertical frame profiles with their profile parts form an open outer slot pointing to an inside of the rack for receiving the connector. The two profile parts can, for example, be perpendicular to one another and thus form a corner cavity. The two profile parts are then placed on correspondingly formed stops of the connector and centered on them. Thus the vertical frame profiles can, for example, be aligned exactly perpendicularly to the depth and width struts of the lower and upper frame. The outer slot being open outwards insures that the frame profile can be introduced simply from the outer side of the rack into the corner cavity.
Additionally or alternatively the corner cavities of the upper and lower frame can form corner cavities open outwards into which the ends of the frame profiles can then be pushed.
In one embodiment of this invention the vertical frame profiles are connected interchangeably with the connectors. Thus the vertical frame profiles have at their ends one or more screw holes which can be disposed flush to the threaded holes of the connectors and fastening screws can be introduced into the screw holes accessible from the outer side of the rack and can be screwed into the threaded holes. The mounting of the vertical frame profiles is thus simple. The vertical frame profiles can by screwed on comfortably from the outer side of the rack. At this point the fastening screws are easily accessible. In order to achieve good support of the vertical frame profiles, in a preferred embodiment of this invention, the connectors project over the upper or lower frame in an axial direction of the vertical frame profile and the vertical frame profiles are supported by the front side up to the free end of the connector.
If the corner cavity has a plane supporting surface on which the connector and the front end of the vertical frame profile are set, then the vertical frame profile can be aligned simply to the fastening points of the connector. If the vertical frame profiles are screwed onto the connector, then the corresponding screw holes and the threaded holes are disposed flush to one another.
REFERENCES:
patent: 2167525 (1939-07-01), Rosendale
patent: 5498073 (1996-03-01), Charbonneau et al.
patent: 0 533 555 B1 (1993-03-01), None
patent: 2551303 (1985-03-01), None
patent: 2231117 (1990-11-01), None
Benner Rolf
Kohler Martina
M{umlaut over (u)}nch Udo
Reuter Wolfgang
Anderson Jerry A.
Cuomo Peter M.
Pauley Petersen Kinne & Fejer
Rittal--Werk Rudolf Loh GmbH & Co. KG
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