Electricity: conductors and insulators – Boxes and housings – Hermetic sealed envelope type
Patent
1981-07-20
1984-09-04
Tolin, G. P.
Electricity: conductors and insulators
Boxes and housings
Hermetic sealed envelope type
339198R, 361426, H02G 1308
Patent
active
044699140
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to an arrangement in a telecommunications system for fitting a connection block in a cover so that a complete connecting means is obtained which can be connected to the front edge of a circuit board or in the back plane of a rack containing circuit boards.
DESCRIPTION OF PRIOR ART
In the Philips (Netherlands) data handbook from April 1978, Components and Materials, part 10, Connectors, there is shown under the catalogue number 433202625920 a typical example of how a connection block is attached in a cover by means of a plurality of screws. This is the most usual way in the art of fitting a connection block into a cover, the block being provided with rows of terminals to which wires are to be connected. The cover thereby serves as a protection for the terminals and wires.
In known embodiments, the problem occurs that the plastic material of the cover gradually cracks with repeated screwing or tightening with nuts in the material. A further problem is that when a complete connector, i.e. connection block and cover, is fitted to a circuit board and the cover needs to be removed, the whole connector must be removed so that the screws will be accessible, the electrical contact between board and connector thus being broken.
SUMMARY OF THE INVENTION
The arrangement in accordance with the invention solves the problem by the cover being so formed that a standardized connection block, e.g. of the type prescribed in DIN standard 41612 (IEC standard 130-14), is pushed into the cover and thereby obtains guiding by guiding pins in the cover through the screw holes in the block which are normally used for screwed attachment. The cover is provided with resilient end walls on which projecting bosses directed towards the interior of the cover are arranged. When the block is pushed into the cover, said end walls first deflect outwardly but reassume their original position when the block is pressed against the bottom of the cover, the bosses then snapping in over the edges of the short ends of the block to lock it to the cover. With the aid of a tool the cover can easily be removed from the block without interrupting the contact between the block and a connected circuit board. The advantages of the arrangement in accordance with the invention in relation to known arrangements is that apart from a stronger connector, there are also obtained large gains in time in fitting and removing the connector, due to the technically simple solution, which in turn give considerable economic advantages.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in detail with the aid of an embodiment, while referring to the attached drawing, in which:
FIG. 1 is a front view of a cover in which a connection block can be inserted;
FIG. 2 is a side view of the cover, partly in section as taken along line A--A in FIG. 1; and
FIG. 3 is a rear view of the cover.
PREFERRED EMBODIMENT
As is apparent from FIG. 1, a cover 1 (a plastic cover according to the example) is provided with guiding pins 2 in the vicinity of each short end, the task of these pins being to serve as guides for a connection block which is pressed into the cover. For said guidance the fact is utilized that the connection block is a standard block and the pins guide the block in the through-holes which in known embodiments are utilized for screws. It is thus not the connection block itself which is the inventive subject. It will be seen from the figure that both long sides of the cover 1 farthest out towards the end walls are provided with slits 5 so that resilient end walls 3 are obtained. Each of the end walls 3 is provided on the inside with a projecting boss 4 directed towards the guiding pin 2. The bosses 4 are at a small distance from the pins 2. The task of the bosses is to snap in over the edges of the short ends of the block when the latter is fitted into the cover, thereby locking it in the cover. In conjunction with the respective guiding pin, the cover is provided with a stop projection formed as a wa
REFERENCES:
patent: 3013105 (1961-12-01), Craig
patent: 3598900 (1971-08-01), Drake
patent: 3710224 (1973-01-01), Daniels
patent: 4273966 (1981-06-01), Briggs, Jr.
Petersson Jan A. S.
Schneider Adalbert G.
Sjoberg Lars G.
Telefonaktiebolaget L M Ericsson
Tolin G. P.
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