Electrical connectors – With insulation other than conductor sheath – Insulating body having plural mutually insulated terminals...
Patent
1997-02-20
1998-06-30
Nguyen, Khiem
Electrical connectors
With insulation other than conductor sheath
Insulating body having plural mutually insulated terminals...
439532, H01R 922
Patent
active
057724768
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an electrical control or signalling device such as a push button comprising a body to be inserted into an orifice in a wall and an electrical unit, notably a contact block, and a supporting baseplate detachably joined to the body on the back of the wall and fitted with removable fixing means for the electrical unit.
Fixing the electrical unit in a detachable way to the supporting baseplate must be carried out in a reliable and durable manner. It is already known, for example, in accordance with document DE-24 46 912 to provide on the electrical unit, two elastic feet that click into lateral notches in the baseplate, but the fixing thus obtained is not sufficiently strong. On the other hand, it is known to fix the contact block to the baseplate by means of a single screw. The fixing is then strong and can be carried out rapidly enough but the prerequisite positioning of the unit is not satisfactory.
The object of the invention is to give great rigidity to the fixing of an electrical unit under a baseplate of a control or signalling device of the type described above, while reducing the time for mounting the device.
According to the invention, the electrical unit includes, on its fixing face situated towards the supporting baseplate, on one side a fixing screw that engages a tapped hole in the baseplate and on the opposite side a rigid positioning and holding heel engaged in a recess of a complementary shape, made in the baseplate.
The introduction of the rigid heel into the recess allows the operator to preposition the unit with the effect that one side of the unit is retained on the baseplate before the screw situated on the other side is tightened up.
The electrical units are advantageously stackable and have, for this reason, on their connecting face, which is situated on the other side to the baseplate, a tapped element and a recess similar to those on the baseplate in order to receive the fixing screw and respectively the rigid heel of a stacked unit.
The invention will be better understood by reading the description that will be made below, with reference to the Figures, of a preferred embodiment.
FIG. 1 is an elevation view of a push button conforming to the invention
FIG. 2 shows, in perspective, a part of the push button, formed by the baseplate and the contact block.
FIG. 3 is an elevation view of the part of the push button shown in FIG. 2.
FIG. 4 is a plan view of the part shown in FIG. 3.
FIG. 5 is a perspective view of a stack of contact blocks under the baseplate of the push button.
FIG. 6 is a side view of the stack.
The electrical control or signalling device illustrated in the Figures is a push button comprising a body 10 fitted with a head 11 and a tubular part 12 with axis X1 and having a diameter less than the width of the head. This is positioned, with, if required, a seal and/or a label which are not shown, on the external face 13a of a thin support wall 13, for example made of metal, which forms part of an enclosure, such as a console, a cabinet, . . . . The wall 13 is oriented in a plane S and includes an orifice 13b into which the tubular part 12 of the push button is inserted, with clearance, this part including, for example, the moving shank of the push button.
A baseplate 20 of a generally polygonal shape, preferably rectangular, is linked to the push button on the reverse side of the wall 13, that is to say on the internal side of the wall 13, in order to support in a detachable way the detachable electrical units 30 such as switch contact blocks, indicator lamp units or auxiliary units. The baseplate is positioned on the tubular part 12 and is rigidly fixed to it by elements shaped to co-operate with one another, for example by fitting into one another, or by clicking onto one another, in order to prevent them being taken out in the direction X1. The baseplate 20 has a central opening 21 to allow free passage of the tubular part 12 of the push button and it is on the other hand fixed against the internal face 13c of the wall 13 by means of an attachme
REFERENCES:
patent: 3001170 (1961-09-01), Eyre et al.
patent: 3054979 (1962-09-01), Buiting
patent: 3244848 (1966-04-01), Chapin et al.
Nguyen Khiem
Schneider Electric SA
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