Supports: cabinet structure – Knockdown or setup type – Skeletal frame
Patent
1995-09-07
1997-12-09
Brittain, James R.
Supports: cabinet structure
Knockdown or setup type
Skeletal frame
3122651, 403 13, 403231, 403258, 403205, A47B 4700
Patent
active
056952635
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY
The invention relates to a cabinet for holding electrical and electronic equipment and subassemblies.
Such cabinets, which are known as 19", control and equipment cabinets, allow numerous different fitting in and on designs and constructions and are suitable for the formation of cabinet and casing systems.
The known equipment cabinets or cabinet casings have a framework of vertical, horizontal and transverse sectional bars, whose cross-section is generally identical. The sectional bars are interconnected by means of corner connectors. As a function of the place of use and the intended use the frames are clad with an upper and lower covering and with side walls, as well as with a rear wall or door and with a front frame or door.
These known cabinets are not always able to meet the requirements with respect to a safe and stable construction. In addition, the necessary manufacturing and assembly expenditure has a disadvantageous influence on costs.
The object of the invention is to provide a stable and reliable cabinet construction, which simultaneously allows an extremely efficient manufacture and assembly.
In a construction of the sectional bars and corner connectors advantageous from the manufacturing and assembly standpoint and which are provided with guide elements for fitting on and with through holes for fixing the sectional bars with the aid of fixing elements, a positive and non-positive connection of the sectional bars is brought about on the front sides thereof.
The guide elements are in particular block-like, e.g. parallelepipedic and are constructed on connecting faces of the corner connectors, allowing in conjunction with a first, complimentary constructed cavity of the sectional bars, particularly with a front opening of a T-groove, a rapid mounting of the sectional bars with prepositioning. The fixing of the fitted sectional bars is subsequently carried out with fixing elements guided in the through holes of The corner connectors and which in each case are inserted into and secured in a second cavity of the sectional bars.
It is advantageous to use hollow corner connectors, which are inexpensively manufactured as pressure die castings. A particularly stable connection between the corner connectors and the sectional bars is obtained with the aid of assembly screws, which are guided with a smooth shank almost positively in thread-free through holes of the corner connectors and with the aid of a self-tapping thread are screwed into a more particularly centrally arranged, circular channel of the sectional bars.
Advantageously on screwing in an assembly screw into the channel provided with a smooth wall, a precise orientation of the sectional bars is obtained.
For the fitting of the cladding parts and for an unhindered opening movement of a door, it is appropriate to have a flush reception of the connecting elements. For easy handling purposes the fixing elements, e.g. countersunk head screws, are accessible from the outer faces of the corner connectors. The outer faces run in a preferred corner connector construction parallel to the connecting faces, which receive the front ends of the sectional bars.
The connecting faces on which the guide elements are in particular arranged in projecting manner, are provided in the vicinity of the exit openings of the through holes with spot facings, which can be used for receiving material thrown up occurring on screwing the assembly screws into the central channels of the sectional bars.
It is advantageous for a stable cabinet or casing construction if at least the horizontal connecting faces are constructed congruently to the adjacent, vertical sectional bars. A sealing web, which is constructed as an extension of the inside of an almost rectangular hollow section and which is in each case directed away from the cabinet interior, can e.g. rest on or be adjacent to a wedge-like constructed area of the corner connector.
For retaining bottom and top coverings, e.g. a bottom and top place or a bottom and top sheet, on the corner connectors
REFERENCES:
patent: 3034844 (1962-05-01), Anderson et al.
patent: 4036149 (1977-07-01), White
patent: 4726701 (1988-02-01), Thomas
patent: 4835935 (1989-06-01), Murphy
patent: 4870711 (1989-10-01), Felix
patent: 5011323 (1991-04-01), Liuo
patent: 5228762 (1993-07-01), Mascrier
Flamme Hans
Heckner Helmut
Simon Peter
Streifeneder Robert
Brittain James R.
Knurr-Mechanik fur die Elektronik Aktiengesellschaft
Tran Hanh V.
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