Joints and connections – Rod end to transverse side of member – Corner joint
Reexamination Certificate
1998-11-12
2001-02-20
Kim, Harry C. (Department: 3629)
Joints and connections
Rod end to transverse side of member
Corner joint
C312S265100, C211S026000, C211S183000
Reexamination Certificate
active
06190081
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a fastening device for attachment of add-on elements, such as mounting rails, storage plates or the like, to vertical frame profiles of a switchgear cabinet, which have rows of evenly distributed fastening retainers, wherein a fastening block, which has fastening retainers for connecting the add-on element, can be added to the frame profile.
2. Description of Prior Art
Such a fastening device is known from German Patent Reference DE 195 37 016 C1. A rack for a switchgear cabinet is described in this publication, wherein the frame profiles are embodied mirror-reversed in relation to their cross-sectional diagonal line and have two receiving sections with fastening retainers in the area of the inside of the rack. These receiving sections are oriented parallel with respect to the associated outsides of the rack and form an interior retainer. A dove-tailed groove, open toward the cross-sectional diagonal line, adjoins this interior retainer. A fastening block, having a dove-tailed strip, can be inserted into the groove and can be fixed in place therein by rotating the fastening block 90°. Here, the fastening block is supported in the dove-tailed groove by a dove-tailed strip. The free surfaces of the fastening block have threaded bores and mounting rails can be fastened therein.
SUMMARY OF THE INVENTION
It is one object of this invention to create a fastening device which allows simple and secure fixing in place of the fastening block, and wherein the fastening block can be produced with a small cost for parts.
This object is attained with a fastening block manufactured as a punched and bent element from a sheet metal blank or as an extruded element. At least one hook element projects from the fastening block, which can be suspended in an associated fastening retainer of the frame profile. The fastening block has two lateral walls, which extend at right angles with respect to each other and form a common vertical inner edge facing the interior of the switchgear cabinet. The lateral walls have the fastening retainers for connecting the add-on elements.
The attachment of the fastening block to a vertical frame profile is easily made possible with the hook elements. In particular, the hook elements can be positioned on the frame profile in a mounting position, which is prescribed by the fastening grid of the fastening receivers. Mounting rails can be installed on the lateral walls. It is possible to absorb large forces by means of the interlocking connection of the fastening block with the vertical frame profile, so that correspondingly large loads can be exerted on the mounting rails. In accordance with this invention, the fastening block is made as a punched and bent element from a sheet metal blank or as an extruded element and is manufactured as a part. In this way the fastening block can be produced in a cost-effective manner.
It is provided in accordance with a preferred embodiment of this invention that the lateral walls are maintained on the same level in which profiled sides of the vertical frame profiles, which extend vertically with respect to the sides of the switchgear cabinet with which they are associated, are also arranged. Thus the profiled sides and the lateral walls form a common fastening level.
A possible variation of this invention is distinguished because the fastening block is maintained in an interior receiver of the vertical frame profile, which is formed by two interior walls extending at an angle with respect to each other and extending in a longitudinal direction of the frame profile. The interior walls have fastening receivers, and the fastening block is fixed in place in one of the fastening receivers by at least one hook element. Thus the fastening block is aligned on the interior walls by means of centering surfaces, so that an exact positioning is possible.
In one preferred embodiment of this invention, adjoining one of the two lateral walls the fastening block has a flange supporting at least one hook element. The flange has a screw receiver, into which a screw is introduced and is screwed into a fastening receiver of the frame profile. Initially, the fastening block can be positioned and maintained on the frame profile with its hook elements. The fastening block can be captively fixed on the frame profile with the screw. This is of particular importance when a switchgear cabinet equipped with built-ins is transported or otherwise subjected to vibrations. The screw assures that the fastening block is always securely fixed in place on the frame profile with its hook elements.
If horizontal support surfaces are bent away from the lateral walls, which seal the fastening block on the top and bottom, and the support surfaces have fastening receivers, the fastening block can be used for the attachment of horizontal storage surfaces which can be placed on the support surfaces and can be fixed in place on the fastening receivers with fastening screws.
This invention will be explained in greater detail in what follows by means of an exemplary embodiment represented in the drawings.
REFERENCES:
patent: 4014618 (1977-03-01), Kristiansen
patent: 4158998 (1979-06-01), Clement
patent: 5312078 (1994-05-01), Marsh
patent: 5655821 (1997-08-01), Laboch et al.
patent: 5749476 (1998-05-01), Besserer et al.
patent: 5930972 (1999-08-01), Benner et al.
patent: 5992646 (1999-11-01), Benner et al.
patent: 6012791 (2000-01-01), Benner et al.
patent: 87 03 311 U (1987-06-01), None
patent: 89 10 783 U (1990-01-01), None
patent: 195 37 016 (1996-10-01), None
Besserer Horst
Hartel Marc
Nicolai Walter
Kim Harry C.
Pauley Petersen Kinne & Fejer
Rittal-Werk Rudolf Loh GmbH & Co.
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