Electricity: circuit makers and breakers – Electric switch details – Cases and bases
Patent
1997-02-05
1999-10-26
Gellner, Michael L.
Electricity: circuit makers and breakers
Electric switch details
Cases and bases
248 271, H01H 902
Patent
active
059732776
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
This invention relates to an electrical control or signalling device such as a push button or lamp or analogous device including a dialogue element intended to be fixed on one side of a support wall, this element being extended by a tubular part to be engaged in an orifice in the wall in order to receive, from the other side of the wall, means of attachment to the wall and an electrical unit such as a switch contact block or an auxiliary unit.
DISCUSSION OF BACKGROUND
The fixing means mentioned above can include a nut screwed onto a thread on the tubular part of the device; if one wishes the attachment to be especially strong and durable, it is generally preferable to benefit from the attachment of a baseplate supporting the contact blocks to the tubular part in order to fix to this baseplate anchoring means such as a tapered screw or pivoting anchoring arms that can be displaced by means of a screw.
Such a device, described in patent EP-452 462, includes a pivoting lever, with a forked shape. It has the advantage of being simple and robust and of facilitating the operations of attachment to the support wall and disassembly, the operator only, in effect, having to manipulate a single screw.
However, the pivoting lever mechanism used in this way has some disadvantages. If it is a lever of the first kind, the clamping operation is rapid since the fitter only makes a small angular rotational movement to the manipulation screw, but the transmitted load is reduced in accordance with the ratio of the lever arms; if it is a lever of the second kind, the transmitted load is increased, but this occurs to the detriment of the amount of rotational movement made to the screw and hence on the clamping time. Furthermore, the mechanical efficiency is decreased by loss of load at the lever pivots.
Finally, when such a push button is mounted on walls of various thicknesses, the anchoring arms of the lever are applied to points on this wall located at variable distances from the axis of the push button. The result is variable positioning of the clamping load that is not controlled by the couple exerted on the push button.
SUMMARY OF THE INVENTION
The aim of the invention is to avoid the disadvantages described whilst guaranteeing to the fitter a firm clamping exerted by means of a single screw in a manner that is independent of variations in the mounting dimensions.
A further aim is to ensure the transmission of load with satisfactory efficiency, in conjunction with an angular travel during manipulation (that is a clamping time) that is as low as possible, with the help of simple devices taking up little space.
According to the invention, the detachable baseplate on the tubular part of the body of the device includes a slide acted upon by a manipulation screw and including anchoring arms which surround the tubular part and which can anchor themselves under the support wall; the slide is linked to the screw and is guided in translation by guide surfaces on the baseplate or on the tubular part and the arms of the slide each have a sharp edge or anchoring point defining a support line which can be displaced within a plane perpendicular to the support plane.
The mounting of the device on the support wall can therefore be carried out with compromise sought for between the transmitted load and the clamping time, whilst keeping the support at a specified distance from the axis of the tubular part whatever the thickness of the wall.
Advantageously, it is provided on the slide, on the side of the orifice for passage of the manipulation screw facing the anchoring edges, a complementary support area which defines with the line previously mentioned, a support plane parallel to the support plane and which can be displaced parallel to it.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be better understood on reading the description which has been made below, with reference to the Figures, of a preferred embodiment.
FIG. 1 is a front elevation and cross-sectional view o
Gellner Michael L.
Nguyen Nhung
Schneider Electric SA
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