Supports: cabinet structure – Knockdown or setup type – Skeletal frame
Patent
1997-05-02
2000-05-16
Cuomo, Peter M.
Supports: cabinet structure
Knockdown or setup type
Skeletal frame
403231, 403169, 312140, A47B 4700
Patent
active
06062664&
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to switchgear cabinets and, more particularly, to frames for switchgear cabinet. Still more particularly, the invention relates to switchgear cabinets made up of frame members and corner joints, the corner joints being introduced with plug-in rods into sockets and being connected to the frame members.
BACKGROUND AND OBJECTS OF THE INVENTION
In known frames, hollow sections are frequently used as frame members which form closed sockets for the plug-in rods of the corner joints. Thus the cross-section of the sockets and of the plug-in rods can be square, rectangular or triangular. However, the closed hollow sections are expensive to produce.
Frames are also known which are made up of open frame members. However, in this case the corner joints of the frame require specially-designed connector parts, a plurality of special parts being usually necessary in order to connect the three frame members abutting in the region of the corner. The advantage of the simpler manufacture of the frame members is achieved at the expense of the increased outlay on parts and assembly for building the frame.
The object of the invention is to provide a frame of the type already mentioned, in which corner joints with sockets are also used with frame members designed as hollow sections, and thus the outlay on parts and assembly can be kept low.
SUMMARY OF THE INVENTION
This object is achieved according to the invention in that the inventive structure has a number of particular characteristics: The frame members (sometimes referred to herein as "rack members") are designed as open hollow sections that are bent several times, are symmetrical about a diagonal plane extending therealong, and are open in the area of their inner sides. The frame members, continuing from two portions forming two outer sides (or "outer profile sides") which are perpendicular to one another, are bent inwards several times to form sockets (or "connecting receptacles") for the plug-in rods (or "connecting projections") of a corner joint (or "corner member"). Each socket, thus formed by the bent rack members, contacts the inserted plug-in rod at least at two points distributed over at least 180.degree. (preferably more than 180.degree.) around the cross-section of the plug-in rod.
Each open hollow rack member is provided, for example, by bending to form two sockets into which two plug-in rods of the corner joint may be inserted. The hollow rack member structure is symmetrical about a diagonal plane, and can be used as a frame member at any position of the frame. The only essential point is that the bent-over sockets form at least three contact points for the plug-in rods, which extend over more than 180.degree. of the periphery of the plug-in rods. This ensures that the plug-in rod is held laterally immovably in the socket.
In accordance with one embodiment of this invention, the plug-in rods are round in cross-section, the sockets are formed from three rack-member portions bent inwards at right angles which continue into an inwardly-bent end portion, the rack-member portions which are parallel to one another of the sockets are adapted to the diameter of the round plug-in rods, and each inwardly-bend end portion forms a further contact point for a plug-in rods, then corner members (or "joint members") with plug-in rods which are cut to length from commercially-available bar material may be used. Such plug-in rods are introduced into connecting receptacles in the corner members and secured therein.
If the design is such that the plug-in rods have a square cross-section, and such that the sockets include four rack-member portions inwardly bent at right angles, with the end portion not closing into contact with other portions of the rack member, then the same advantages can be achieved.
An opportunity of attachment over the entire length of the frame members is provided in that the inner portions (or "inner sides") of the sockets, each of which extends in a plane parallel to that of one of the outer profile sides
REFERENCES:
patent: 3645569 (1972-02-01), Reilly
patent: 4632473 (1986-12-01), Smith
patent: 4678359 (1987-07-01), Keen
patent: 4691970 (1987-09-01), Neri
patent: 4768845 (1988-09-01), Yeh
patent: 5470139 (1995-11-01), Hsiao
Cuomo Peter M.
Rittal--Werk Rudolf Loh GmbH & Co. KG
Vu Stephen
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