Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
1999-05-24
2001-12-25
Gandhi, J N (Department: 2841)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C361S753000, C361S759000, C361S804000, C174S13800J
Reexamination Certificate
active
06333855
ABSTRACT:
BACKGROUND OF THE INVENTION
Mounting devices or connectors are often required, for example, for mounting printed circuit boards in a housing, wherein the printed circuit boards are separated from an electrically conducting or metallic carrier. The mounting devices must be easily attached onto the carrier such that the printed circuit boards can be placed in the desired position with minimal effort and cost. In addition, the mounting devices must be designed such that reliable and easily detachable mechanical and electrical connections can be formed between the printed circuit boards and the carrier. The printed circuit boards, which are often mounted in housings offering little access to the boards, should also be installable and removable as conveniently as possible.
In view of the foregoing, a conventional mounting device having of a spacing sleeve, a screw and a nut is often inadequate in that the spacing sleeve cannot be affixed onto the carrier and thus must be held in place by hand during installation. In addition, sufficient space within a housing or enclosure is usually required in order to screw the nut in a controlled manner as required.
Conventional plastic, dowel-like mounting devices having elastic mounting wings inserted into corresponding recesses of the carrier, thereby fixing the mounting element on the carrier, are also inadequate in that electrically conducting connections cannot be made. The additional use of a screw and nut with these mounting devices is ruled out for the reasons described above.
Thus, there is a need for a printing circuit board mounting device that overcomes the above-mentioned shortcomings of the conventional mounting devices.
SUMMARY OF THE INVENTION
The present invention provides a printed circuit board mounting device that can be manipulated easily and reliably, thus rendering possible the convenient mounting of a printed circuit board on a carrier, and also the formation of an electrical connection between the printed circuit board and the carrier. Consequently, the mounting device of the present invention allows swift and easy installation and removal of printed circuit boards within an electronic housing or enclosure.
In accordance with a preferred embodiment of the present invention, the mounting device includes: a spacing element for attaching onto the carrier and for supporting the printed circuit board; and an electrically conducting mounting element coupled to said spacing element for forming a mechanical and electrically conducting connection between the circuit board and the carrier.
In another preferred embodiment of the present invention, the mounting device is characterized in that the spacing element is formed of a plastic or elastic material, and includes a sleeve-type spacing section and a mounting section.
In yet another preferred embodiment of the present invention, the mounting device is characterized in that the mounting section includes a plurality of elastic, finger-type or wing-type mounting members provided for engagement in corresponding recesses of the carrier.
In still another embodiment of the present invention, the mounting device is characterized in that the mounting element includes a screw which, in its tightened position, forms an electrical connection between the printed circuit board and the carrier by means of its head or via a shim at a first end in contact with the printed circuit board and by means of its second, free end in contact with the carrier.
Further in accordance with the present invention, the screw has at its second end a tip which, when tightened, is attached to the carrier or into a bore provided in the carrier.
When the mounting devices according to the invention are used, the carriers are provided with recesses for receiving the mounting members and the printed circuit boards are provided with holes for the screws. Optionally, the carriers are also provided with bores for receiving the tips of the screws, which may, however, be omitted if the carriers are composed of a sufficiently soft material and are formed, for example, by aluminum rails or aluminum profiled sections. In that case, it is possible to screw the tips whose material must of course be harder than aluminum, into the solid material of the carriers.
To mount a printed circuit board, the mounting members are fitted into the recesses. This is easily performed, even in the case of unfavorable installation conditions in a large and unmanageable housing, since the recesses on the carrier can be easily located by touch. The printed circuit board is then placed on the spacing elements, typically four per printed circuit board, and positioned such that the holes in the printed circuit board are aligned with the bores of the spacing element. The screws are then fitted through the holes in the printed circuit board into the bores and tightened.
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Leroy Roger
Prabaonnaud Jean François
Vassal Jean Louis
Wegmann George
Alarmcom Elpro SA
BakerBotts LLP
Gandhi J N
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