Supports: cabinet structure – Knockdown or setup type – Skeletal frame
Reexamination Certificate
1999-05-18
2001-04-17
Cuomo, Peter M. (Department: 3624)
Supports: cabinet structure
Knockdown or setup type
Skeletal frame
C211S189000, C211S182000
Reexamination Certificate
active
06217138
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a frame section for a rack of a switchgear cabinet having at least one interior wall facing an interior of the switchgear cabinet, which has at least one row of fastening receivers cut at even distances.
2. Description of Prior Art
A rack of this type is described in German Patent Reference DE 33 44 598. The rack has twelve identical frame sections, which are connected with each other. The frame sections support two interior walls, which are connected with each other at right angles. A row of fastening receivers is cut into each of these interior walls. The fastening receivers are formed by holes with an essentially square cross section.
SUMMARY OF THE INVENTION
It is one object of this invention to provide a frame section of the type mentioned at the outset, wherein impairment of the stiffness because of the fastening receivers is small and wherein a stable installation of built-in units at the fastening receivers is possible.
In accordance with this invention this object is achieved with fastening receivers embodied as slit-shaped holes, having a clear opening width in a longitudinal direction of the frame section greater than a clear opening width transversely to the longitudinal direction.
The longitudinally oriented slit-shaped fastening receivers affect only slightly the stiffness, in particular the distortion resistance, of the frame section. Because the fastening receivers extend in the longitudinal direction of the frame section, a stable attachment of built-in units is possible. Fastening elements of a structural height, which is matched to the clear opening width in the longitudinal direction of the frame section, can be supported in the fastening receivers. Because a large opening width is provided, the fastening elements can also have a correspondingly massive dimension in the longitudinal direction of the frame section. The main load axis when attaching built-in units now extends along the frame section in such a way that the fastening element introduced into the fastening receiver can optimally absorb the occurring load.
Therefore the result is a frame section having a high degree of stiffness achieved by special dimensioning of the fastening receivers. The solid attachment of built-in units on the fastening receivers is also possible.
When dimensioning the fastening receivers, the clear opening width of the fastening receivers in the longitudinal direction of the frame section should be at least twice as large as the opening width transversely to the longitudinal direction. The most diverse fastening elements can be fixed in place in the fastening receivers. The employment of hook-shaped fastening elements is advantageous. Mounting rails can be used as built-in units, for example, and are bent from sheet metal. In this case the hook-shaped fastening element is punched out of the sheet metal. The clear opening width transversely to the longitudinal direction of the frame section is then matched to the thickness of the sheet metal. It is therefore possible to provide a simple and cost-effective connecting mechanism due to the slit-shaped fastening receivers.
In a preferred embodiment of this invention two interior walls, which extend at right angles to each other, face the interior of the switchgear cabinet, and a further profiled side embodied as an interior wall is connected at right angles with the interior walls. Each one of the interior walls/profiled sides has a row of fastening receivers. A plurality of fastening possibilities is provided by this frame section, which can be used depending on the space availability in an interior of the switchgear cabinet. In particular, one profiled side is always parallel in relation to an interior wall, resulting in two levels of fastening, which extend parallel with each other. The number of attachment possibilities for built-in units can also be easily increased because the interior wall facing the interior of the switchgear cabinet respectively has at least one further row of fastening receivers. The rows of fastening receivers extend parallel with respect to each other. It is conceivable in connection with a rack assembled from the frame legs in accordance with this invention, that the horizontal frame sections, which form a bottom frame and a cover frame, have two rows of fastening receivers on an interior wall extending vertically with respect to the side of the rack. At least the row of fastening receivers facing the side of the rack forms the slit-shaped holes, and the rows of fastening receivers transition into the rows of fastening receivers of the vertical frame sections. Because the rows of fastening receivers of the horizontal frame sections transition into the vertical frame sections, built-in units can be fastened in the corners. It is an advantage if the fastening receivers transition into each other in a grid layout.
REFERENCES:
patent: 4643319 (1987-02-01), Debus et al.
patent: 5333950 (1994-08-01), Zachrai
patent: 20 43 699 (1972-03-01), None
patent: 33 44 598 (1984-09-01), None
patent: 41 40 072 (1993-06-01), None
patent: 42 44 143 (1994-07-01), None
patent: 43 36 285 (1995-04-01), None
patent: 296 01 867 U (1996-08-01), None
Benner Rolf
Kohler Martina
Munch Udo
Reuter Wolfgang
Anderson Jerry A.
Cuomo Peter M.
Pauley Petersen Kinne & Fejer
Rittal--Werk Rudolf Loh GmbH & Co. KG
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