Geometrical instruments
Patent
1981-07-20
1984-07-10
McQuade, John
Geometrical instruments
339198H, H01R 13627
Patent
active
044589727
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a device in a telecommunication system, adapted for operation when connecting a first connecting means to a second connecting means, each comprising a connection block and a cover, to lock the connecting means to each other to form a bus member, and for connecting said bus member or either of said connecting means to the front edge of a circuit board or to the back plane of a magazine containing circuit boards.
DESCRIPTION OF PRIOR ART
In known devices, for example as is apparent of Philips data handbook from April 1978, Components and Materials, part 10, Connectors, catalogue number 433202625920, metal locking devices mounted outside the covers are utilized for locking, the locking device being supplemented by some kind of receiving means on the circuit board edge or in the back plane.
SUMMARY OF THE INVENTION
The problem with the known devices is that the locking devices often have poor flexibility, i.e. they cannot be used for locking attachment between bus members as well as being utilized for non-locking attachment to the edge of a circuit board or in the back plane of a circuit board magazine. A locking device of the known type is furthermore expensive to produce.
The device in accordance with the invention is characterized by solving the problem by providing the cover with special locking holes in which lamellar locking springs, made from plastic, are insertable. The locking holes are arranged as through channel-like recesses in the transverse direction of the cover. The locking springs are formed with a wide and a narrower portion, the narrower portion being insertable from one side of the cover and retained by a resilient snap-on action. The narrower portion of the spring projects in approximately to the middle of the locking hole, and the wide portion projects outside the front edge of the cover. At its back edge, the locking hole is provided with a locking protuberance. In connecting a first connecting means the cover of which is provided with locking springs, to a second connecting means, that portion of the locking springs lying outside the locking hole on said first connecting means are pushed into the rear portion of the locking hole in said second connecting means, said locking protuberance in the locking hole engaging in a recess in the locking spring by resilient snap action to lock the connecting means to each other. As will be explained in conjunction with an embodiment, the locking springs are also formed so that a positive but non locking connection between said connecting means and the front edge of a circuit board or the back plane of a circuit board magazine can be obtained.
The advantages with the device in accordance with the invention as compared with known devices is that the locking device will be substantially simpler and can be manufactured at lower cost by it being made of a plastic material. Most important is, however, that a flexible locking device is obtained which can be used both for rigid locking when arranging bus members and also for unlocked attachment to circuit boards or the back plane in a circuit board magazine.
BRIEF DESCRIPTION OF THE DRAWING
The device in accordance with the invention will now be described in detail with the aid of an embodiment, while referring to the appended drawing, in which,
FIG. 1 illustrates a cover seen from one side with locking holes but without locking springs,
FIG. 2 illustrates the cover seen from one side with locking springs arranged in the locking holes,
FIG. 3 illustrates a locking spring seen from above,
FIG. 4 is a sectional view of a locking spring taken along line 4--4 in FIG. 3 and
FIG. 5 illustrates the appearance of the locking holes from the rear of a cover, i.e. the back portion of the locking hole.
PREFERRED EMBODIMENT
As will be seen from FIG. 1, a cover 1 is provided with a plurality of channel-like holes or recesses 2 running right through the cover, designated hereinafter as locking holes. The locking holes are accessible from the front edge 3 of the
REFERENCES:
patent: 2765581 (1956-10-01), Adler
patent: 3822499 (1974-07-01), De Vos
patent: 4012100 (1977-03-01), Viscosi
patent: 4159592 (1979-07-01), Gabriel
Malmberg Karl G.
Petersson Jan A.
Schneider Adalbert G.
McQuade John
Telefonaktiebolaget L M Ericsson
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