Cable entry for a switch cabinet

Details Cable entry for a switch cabinet Cable entry for a switch cabinet

2000-01-14

2001-11-27

Reichard, Dean A. (Department: 2831)

Electricity: conductors and insulators

Boxes and housings

C174S058000, C220S004020

Reexamination Certificate

active

06323422

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a cable lead-in for a switchgear cabinet with an opening in a bottom of the switchgear cabinet, which is surrounded by a connecting support. The opening can be closed by bottom plates, which can be lined up with each other and connected with the connecting support. The sides of adjoining bottom plates which are associated with each other have beveled edges with sealing strips fastened thereon, and the cables are inserted into the switchgear cabinet and sealed by deforming the sealing strips.
2. Description of Related Art
Such a cable lead-in is known from German Patent Reference DE 78 16 729 U1 wherein sealing strips are embodied as plastic foam blocks. When adjoining bottom plates are lined up with each other, the cables introduced between the plastic foam blocks of adjoining bottom plates are sealed. While lining up, the bottom plates are pressed against each other and the plastic foam blocks are deformed in the process. In this case the edges of the bottom plates are uniformly beveled toward one side of the bottom plates, so that with a sufficiently wide sealing area there must be sufficient space on this side of the bottom plates for these edges. Thus, the installation space above the bottom plate is correspondingly reduced.
As shown in German Patent Reference DE 196 04 219 C1, it is also known to attach an additional edge on one side of a bottom plate, which is oriented toward the other side of the bottom plate. In this way edge areas are created outside of the sealing strip, which can have a row of fastening means for the strain-relieved and/or electrically conducting connection of the cables with the bottom plate.
SUMMARY OF THE INVENTION
It is one object of this invention to provide a cable lead-in of the type mentioned above but which results in a sufficiently wide sealing area without essentially restricting the installation space above and under the bottom plate, and without making production of the bottom plate considerably more expensive.
In accordance with this invention, this object is achieved with edges of the bottom plates designed as double seams, one section of which is pointed toward the top or bottom of the bottom plate, while the second end section of the double seam extends both over the first section and projects in relation to the top or bottom of the bottom plate. The sealing strip extends over the width of the end section of the double seam.
The edge of the bottom plate embodied as a double seam is easy to produce and extends over both sides of the bottom plate. Thus, even with a broader sealing area the installation space above as well as under the bottom plate is only negligibly restricted.
So that the bottom plate can be easily connected with the connection support of the switchgear cabinet, in one embodiment on the sides without a double seam the bottom plate extends past the double seam by means of support edges. In this case, the double seam does not interfere with the placement of the bottom plate on the connection support of the switchgear cabinet.
If a cable lead-in is provided on only one side of the bottom plate, the bottom plate is simplified because the bottom plates have a single-beveled edge on the side opposite the double seam.
The single-beveled edge does not interfere with the connection between the bottom plate and the connection support if the single-beveled edge projects away from the underside of the bottom plate and terminates in front of the support sections of the bottom plate.
The corners of the support sections of the bottom plate are preferably slanted.
In one preferred embodiment, the end section of the double seam projects past equal portions on the top and bottom of the bottom plate.
If a strain-relieved or electrically conducting connection of the cables with the bottom plate is desired, in a further embodiment the end section of the double seam is widened at least on one side past the fixed-in-place sealing strip and has in this area at least one row of fastening means for the strain-relieved and/or electrically conducting connection of the cables with the bottom plate.
BRIEF DESCRIPTION OF THE DRAWING


REFERENCES:
patent: 4670623 (1987-06-01), Siffrin
patent: 4963696 (1990-10-01), Owen et al.
patent: 5079389 (1992-01-01), Nelson
patent: 5107073 (1992-04-01), Steffen
patent: 5300731 (1994-04-01), DeBaratolo, Jr. et al.
patent: 5422436 (1995-06-01), Zachrai
patent: 78 16 729 (1978-09-01), None
patent: 27 20 936 (1978-11-01), None
patent: 196 04 219 C1 (1997-06-01), None

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