Receptacle for electronic cards and method of assembling the sam

Details Receptacle for electronic cards and method of assembling the sam Receptacle for electronic cards and method of assembling the sam

1984-12-06

1986-06-17

Abrams, Neil

Geometrical instruments

211 41, H05K 114

Patent

active

045952493

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a receptacle for electronic cards.
The present invention also relates to a method of assembling the same.
Apparatuses of the programmable auto-control type usually incorporate, in practice, a container of which the bottom (often arranged vertically during operation) carries a printed circuit, used as a bus, and rows of connections, each of which is intended for connecting the printed circuit to corresponding pins arranged at the edge of an input card or an output card. The input cards and output cards, which will be called input/output cards hereafter, are placed side by side in the container. Each card also carries, on a side thereof remote from the bottom of the container, other connections by means of which it is connected to devices to be monitored, where an input card is concerned, or to devices to be controlled, where an output card is concerned.
It is known to make the rows of connections in blocks which are fastened to the bottom of the container and then connect the connections electrically to the printed circuit by means of brazed seams.
However, the material of the container bottom, for example metal, and that of the printed circuit have very different coefficients of thermal expansion. Since the printed circuit is connected to the container bottom opposite each row of connections, movements of thermal origin risk causing bending in the printed circuit, and this can damage and/or impose a strain on it, and even fracture the brazed seams between this printed circuit and the connections.
It is also known to produce as a container a frame formed by two opposing flanks connected to one another by means of two pairs of profiled crossmembers. Each pair of crossmembers forms one of the sides of the frame. Slides or card guides directed perpendicularly to the crossmembers and to the container bottom are mounted next to one another against the face of each pair of crossmembers which is directed towards the interior of the container. The slides make it possible to slidably insert an input/output card between two opposing slides, each of which is carried by one of the pairs of crossmembers. The rows of connections are fastened to the printed circuit, which is fastened by means of screwing or snapping-in to one of the ends of at least some of the slides.
In this embodiment, there is no longer any risk that the electrical connections made between the rows of connections and the printed circuit will be subjected to mechanical stress, since the block carrying each row of connections is connected mechanically to the substrate of the printed circuit. However, the printed circuit risks being subjected to bending stress if it experiences movements of thermal origin which the ends of the slides cannot follow because of their method of assembly. Moreover, the printed circuit mounted in this way is not protected on either side and is therefore widely exposed to shocks, dust and other attacks.
The object of the invention is, therefore, to overcome these disadvantages by proposing an arrangement of a programmable auto-control, in which the printed circuit and its connection to the rows of connections are protected from mechanical attacks, particularly from stresses attributed to differential thermal movements.
The invention is therefore directed to a container the bottom of which possesses at least one printed circuit, on which connecting blocks, each carrying a row of connections, are fastened towards the interior of the container, slides aligned side by side along two opposite walls adjacent to the bottom of the container, one end of each slide being associated mechanically with the container bottom, means of positioning the said end of each slide as regards displacement parallel to the rows of connections and as regards displacement transverse to the bottom of the container, and input/output cards which are each mounted removably side by side between two opposing slides, the cards having on one of their edges pins adapted to cooperate with the connecting blocks so as to connect the c

REFERENCES:
patent: 3733523 (1973-05-01), Reynolds et al.
patent: 3838777 (1974-10-01), Thornicroft et al.
patent: 3895719 (1975-07-01), Cakora
patent: 4046443 (1977-09-01), Champagne
patent: 4096546 (1978-06-01), Gabr
patent: 4407416 (1983-10-01), Anderson

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