Electricity: conductors and insulators – Boxes and housings – Hermetic sealed envelope type
Reexamination Certificate
1998-04-28
2001-05-15
Reichard, Dean A. (Department: 2831)
Electricity: conductors and insulators
Boxes and housings
Hermetic sealed envelope type
C174S034000, C361S679090, C361S816000, C361S818000
Reexamination Certificate
active
06232550
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a module carrier having spaced-apart sheet metal side plates and a sheet metal cover disposed between and attached to the side plates. The cover is formed by a cover plate and flanges or segments which depend from the cover plate and engage the side plate. The side plate has strips which are parallel to an edge of the side plate and forms eyes into which tongues of the cover flange can be inserted.
Module carriers for electrical and electronic components are for example defined in the norms of the IEC standards for the chasses and components of the 19-inch technology, and various manufacturers offer module carriers in this technology. Thus a brochure of the company Knürr AG, Schatzbogen 29, D-81829 Munich, shows 19-inch module carriers/VME system in the 1997 catalogue of which the sheet metal cover is bent off and inserted with its individual tongues into strips in side parts which protrude outwardly. Other tongues of the bent-off angle piece are connected to the side parts with screws. This connection has the disadvantage that temporally unlimited contact forces which are required for a screening arise at the screw connections with certainty, whereas an admittedly good primary anchoring and a good primary contacting can be achieved with the inserted tongues, but a long-term contacting is however not so certain. A further disadvantage is the contours of the angle piece, the tongues, the screw heads and the strips, which protrude with respect to the plane of the side parts and provide obstacles for hard objects.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a force-locked, repeatedly insertable connection between the cover and the side plates of an electronic module carrier.
This object is satisfied by arranging the cover segment and the eyes on the inner side of the module carrier. Contact springs are cut free on the cover plate and knobs are arranged on the outer sides of the springs which produce a predetermined contact force when the cover is in its inserted position.
The arrangement has the advantage that through the protected arrangement, contact springs can be chosen which are sufficiently long and elastic in order to produce permanent contact surfaces independently of vibrations and shocks. Although formed of the same sheet metal, contact springs with a long resiliency path are possible. With knobs which are pressed out of the sheet metal, the same material can be chosen for the contact in order to reduce the risk of corrosion due to differing electrochemical potentials. If the contact springs and insertion tongues are placed close to one another spatially, the embossing of the knobs, the cutting free of the contact springs and the cutting free of the insertion tongues can be combined in one tool and the distance L between two contact points along the bending edge of an angle piece can be chosen freely corresponding to the screening requirements through a mere displacement of the worked article. If larger bending torques are to be transmitted between the angle piece and the sheet metal cover, eyes and insertion tongues can be arranged at alternating distances from the bending edge of the angle piece and thus, seen on the average over the distance of the strips, take up bending torques in both directions. It is essential that the elastic reset of the contact springs be great enough in order to produce sufficiently large contact forces in spite of micro-movements. A further advantage results if the knobs are arranged in the vicinity of the insertions since the tolerances are taken up on insertion within a comparably large elastic travel of the contact springs.
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Elma Electronic AG
Reichard Dean A.
Townsend and Townsend / and Crew LLP
Walkenhorst W. David
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