Supports: racks – Elements
Reexamination Certificate
1999-04-19
2001-03-27
Gibson, Jr., Robert W. (Department: 3634)
Supports: racks
Elements
C211S026000, C211S189000, C211S182000, C312S257100, C312S265100, C361S829000
Reexamination Certificate
active
06206211
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a rack for a switching cabinet.
2. Description of Prior Art
A wide variety of requirements are imposed on a rack of a switching cabinet, all of which must be met by the cross-sectional shape of the employed frame pieces. Frame pieces that deviate in cross-sectional shape of the vertical frame piece can be used in the region of the lower or upper frame. A wide variety of fastening possibilities aligned in several directions are required precisely in the vertically aligned frame pieces of the rack. Optimal strength, preferably torsional rigidity must also be achieved with the least possible material cost for the frame pieces and simple manufacture of the frame piece must nevertheless be possible. Also, in the region of the vertical outside corner edges of the rack sufficient free space must be present to mount the hinge flap of a cabinet door and to form and accommodate sealing elements for the side walls or cabinet back wall being mounted.
A number of frame pieces are known for the rack of a switching cabinet that partly meet the mentioned requirements, but do not offer a satisfactory solution in all respects. Frame pieces designed as open hollow sections perform much more poorly than closed hollow sections.
SUMMARY OF THE INVENTION
It is one object of this invention to provide a frame piece for a rack of a switching cabinet, which has sufficiently high strength for universal fastening possibilities with limited material cost and simple manufacturing, particularly when used as a vertical frame piece and optimally meets the imposed requirements.
This object is solved according to this invention with a frame piece having a section outside as a connection section between the outsides of the rack that meet each other at right angles. The fastening sections of a section interior are connected to the connection section, which have fastening mounts in the section longitudinal direction and also grade into section sides having fastening mounts. The fastening sections are situated in a first angle to the outsides of the rack and the section sides are positioned at a second angle to the fastening section being connected. The fastening sections and section sides form two inside edges of the section interior.
The section outer parts designed as a connection section starting from the outsides of the rack that contact each other at right angles leave sufficient free space in the region of the outer corner edge to meet the requirements for attachment of a cabinet door and for sealing of the side walls, back wall or cabinet door being mounted.
The fastening sections in the section sides of the section internal side have different fastening planes in different directions, in which their alignment with respect to the outsides of the rack can be established with choice of the first and second angles. The torsional rigidity of the frame piece can be optimized and the material expenditure reduced with choice of these angles. Also, the section sides facing each other form a mount opened toward the interior of the rack for attachment of assembly rails, which can expand the variation in fastening possibilities.
The fastening possibilities can be improved because the fastening mounts of the fastening sections have a first identical spacing to the inner edges, and the fastening mounts of the section sides have a second identical spacing to the inside edges.
If the embodiment is simplified so that the first spacings are chosen equal to the second spacings, then uniformly configured assembly rails, attachment parts and the like can be mounted on all fastening planes of the fastening sections and section sides.
The torsional rigidity of the frame piece can be increased by joining the section sides to each other and/or to the connection section.
Incorporation in a rack can be simplified by designing the frame piece as having mirror-image symmetry with respect to the corresponding rack diagonal.
The first and second angles can be chosen as acute, right or obtuse angles so that the fastening planes can be positioned in different directions.
In order to configure the frame piece as a closed hollow section, in one embodiment the section sides are connected to each other directly or via a transition section.
Greater capabilities for selecting the angle between the outside of the rack and the fastening sections and the angle between the section sides and the fastening sections is then allowed with the transition section or direct connection of the section sides to the connection section of the section outer part.
The transition section between the section sides runs parallel to the facing part of the connection section and can be connected to the facing part.
The fastening mounts can be designed as holes and/or square or rectangular openings and extend as rows with uniform spacing in a longitudinal direction of the section. The fastening mounts in the fastening sections and section sides can then differ in design and/or spacing from those in the section sides.
According to one embodiment the alignment of the fastening planes can be laid out so that the fastening sections each run parallel to the section sides not contacted.
If the section internal side has a transition section between the section sides, then for more fastening possibilities, the transition section can have fastening mounts.
The frame piece can be simply produced as a part of an extruded section.
In another manufacturing possibility for the frame piece it is formed as a stamped-bent part, which is preferably joined in the region of the free edges of the section sides or is formed as a stamped-bent part joined in the region of the connection section.
REFERENCES:
patent: 4643319 (1987-02-01), Debus et al.
patent: 5202818 (1993-04-01), Betsch et al.
patent: 5749476 (1998-05-01), Besserer et al.
patent: 5761797 (1998-06-01), Besserer et al.
patent: 5806946 (1998-09-01), Benner et al.
patent: 5930972 (1999-08-01), Benner et al.
patent: 5992646 (1999-11-01), Benner et al.
patent: 6030063 (2000-02-01), Benner
patent: 6062664 (2000-05-01), Benner
patent: 6070957 (2000-06-01), Zachrai
Munch Udo
Nicolai Walter
Vogel Georg
Gibson , Jr. Robert W.
Pauley Petersen Kinne & Fejer
Rittal--Werk Rudolf Loh GmbH & Co. KG
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