Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
1998-12-18
2001-01-23
Gandhi, Jayprakash N. (Department: 2841)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C361S740000, C361S756000, C361S797000, C361S801000, C361S802000, C211S041170
Reexamination Certificate
active
06178092
ABSTRACT:
FIELD OF AND BACKGROUND OF THE INVENTION
The invention relates to new and useful improvements in subassembly racks with plug-in modules. More particularly, the invention relates to subracks with at least one plug-in module that is provided with a front plate for mounting the module to the subrack.
In conventional subracks, the metallic front plates of plug-in modules generally form a closed, electromagnetically screening front side. The gaps between the individual front plates of the modules are generally bridged with electromagnetic screening by contact spring elements on the front plate. One resulting problem is that the front plates can be slightly displaced between the gaps by the horizontal lateral forces produced because of the contact spring elements. Because of the combined offsets of a number of front plates, one given opening may have too small a width to receive its intended front plate. A module which is to be inserted last between several modules already mounted in place can thus no longer be pushed into the subrack, or can be pushed in only with a risk of damaging the contact spring elements.
A subrack for plug-in modules provided with front plates is known, e.g., from German Patent DE 41 30 355 C1 and from the catalog “europac lab HF, EMC Schroff, D 9/94 7/7 (39600-100)” from the company Schroff GmbH. Longitudinally arranged, equidistant threaded holes for screwing on front plates are provided on two front module rails. The front plates have at least one fastening screw on the top and on the bottom. In addition to the fastening screws, at least one additional centering pin is arranged on the back side of each of the front plates. When a plug-in module is inserted, these centering pins connect into corresponding centering holes arranged in front of the threaded holes, and serve to position the individual front plates in the positions provided at the respective slot on the subrack.
It is disadvantageous that, apart from the fastening screws, centering pins are additionally required to be fitted on the back of the front plates. These centering pins have to be fashioned onto the front plates in their accurate position since, in particular when the front plates are produced by an extrusion process, the centering pins cannot be integrally formed at the same time as the front plates themselves during the production process. One result is a disadvantageously increased outlay in terms of material. In addition, an increased number of production steps is needed for manufacturing the front plates.
OBJECTS OF THE INVENTION
It is therefore an object of the invention to provide a subrack with modules which have front plates configured in a less complicated way. It is a further object to provide a subrack with modules that can be positioned satisfactorily on the subrack and can be inserted and withdrawn without difficulty.
SUMMARY OF THE INVENTION
These and other objects of the invention are achieved by the teachings of the independent claims. Particularly advantageous refinements of the invention are the subject matter of the dependent claims.
The subrack according to the invention has the advantage that the front plate is configured with screws reaching through it. The screws are preferably designed in the form of shank screws which can be fitted into the front plate so that the front plate has virtually no ability to move, i.e., has no play, in the radial direction, but the shank screws can still be rotated and be displaced in the axial direction.
It is particularly advantageous that the shank screws of the front plates simultaneously undertake two functions. Specifically, when the module is plugged into the subrack, the front plate is simultaneously centered by the shank screws and can be fixed accurately in position on the subrack by the same shank screws.
Another advantage is the reduced outlay associated with manufacturing the front plates for a subrack according to the invention, relative to that for conventional arrangements.
REFERENCES:
patent: 5375724 (1994-12-01), Mazura
patent: 2348170 (1975-04-01), None
patent: 8533398U1 (1986-03-01), None
patent: 4130355C1 (1992-09-01), None
patent: 296 02 426 U1 (1996-05-01), None
patent: 0527608A1 (1993-02-01), None
patent: 2599927 (1987-12-01), None
Catalog “europac lab HF”, EMC Schroff, D Sep. 1994 7/7 (39600-100), Sep. 1994, 3 pages.
Billenstein Ernst
Korber Werner
Kurrer Siegfried
Schaffer Kurt-Michael
Gandhi Jayprakash N.
Siemens Aktiengesellschaft
Sughrue Mion Zinn Macpeak & Seas, PLLC
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