Rack with a lower frame and an upper frame made of a continuous

Supports: cabinet structure – Knockdown or setup type – Foldable

Patent

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Details

3122654, A47B 4300

Patent

active

06142594&

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
This invention relates to a rack for a switching cabinet with a bottom and top frame assembled from horizontal depth and width struts, wherein the depth and width struts arranged at an angle to each other have corner mounts open to an outside of the rack on which vertical frame sections can be mounted, the ends of the depth and width struts form guides on which the vertical frame sections are positioned, and the depth and width struts of the bottom and/or top frame are joined in one piece into a continuous section.
2. Description of Prior Art
This type of rack is known from Great Britain Patent Reference GB 2 231 117 A. A rack with a bottom and top frame is shown in this document in which the bottom and top frames are designed in three parts. Specifically, upper and lower flange plates are joined via four side parts. The flange plates are welded to the side plates. Notches that serve as corner mounts for the vertical frame sections are provided in the corner regions of the flange plates. The ends of the U-shaped side parts extend slightly into the corner mounts and therefore form guides on which the vertical frame sections lie in the assembled state. The manufacturing cost to produce such bottom and top frames is significant. Moreover, precise longitudinal alignment of the vertical frame section poses problems and is not simple to carry out without additional aid.
A switching cabinet having two vertical side parts joined via horizontal plates is known from European Patent Reference EP 0 577 140 A1. The vertical side parts have a frame-like design and can be made from a continuous section. The continuous section has angled notches. The continuous section can be bent in the region of these notches so that a closed frame is formed.
This type of rack is known, for example, from German Patent Reference DE 36 11 693. The bottom and top frame of such a rack are produced from two depth and width struts and four identical corner connectors. The depth and width struts are designed as hollow sections into which the plug-in projections of the corner connectors are inserted. The vertical frame sections are also pushed onto a plug-in projection of the corner connector. To achieve a rigid connection, the depth and width struts, as well as the vertical frame sections, are welded to each other on the corner connectors.


SUMMARY OF THE INVENTION

It is one object of this invention to provide a rack of the initially mentioned type in which a simplified design is achieved for the bottom and/or top frames and to which the vertical frame section can be added on simply and fitted precisely.
This object is achieved with a continuous section formed from a stamped and bent part, wherein the depth and width struts are joined to each other via connection sections, on which the depth struts can be bent out relative to the width struts. In the vertical direction mounting surfaces at a spacing from the guides are arranged in the corner mounts of the bottom and/or top frame on which the ends of the vertical frame section are positioned.
In this embodiment of a rack, a simple connection between adjacent depth and width struts arranged at an angle is achieved. To produce the bottom and top frame, a flat material blank or a steel sheet is first punched out. Profiling of the material blank then occurs so that a continuous section is produced. To produce the closed bottom/top frame the depth and width struts joined in one piece are bent out opposite each other. The free ends of the continuous section can be joined, for example, welded or screwed. The design of the bottom/top frame is substantially simplified since additional corner connectors for joining the depth and width struts can be dispensed; specifically, it is designed in one part. For matching alignment of the vertical frame section in the corner mount of the bottom/top frame, mounting surfaces on which the vertical frame sections are positioned on the end are used in addition to the guides that are formed from the ends of the d

REFERENCES:
patent: 3110535 (1963-11-01), Anderson
patent: 3129841 (1964-04-01), Loewenthal et al.
patent: 3642310 (1972-02-01), Hudson

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