The present invention relates to a faceplate for electrical master
boxes with openable flap.
It is known that the faceplates normally used for electrical master
boxes in which, for example, automatic switches, differential circuit breakers,
and other electrical components are grouped together, are often provided with
a covering flap that is pivoted to the faceplate.
Currently available flaps are usually opened manually by acting in
appropriately provided protruding regions or with other elements that allow to
provide a hold for opening.
With all solutions, although opening the flap is an extremely common
operation, in many cases it is not an easy one, and therefore the risk arises of
damaging the flap due to incorrect actuations.
A principal aim of the invention is to solve the above problem by
providing a faceplate for electrical master boxes with an openable flap that allows
to open the flap in a fully automatic manner with an extremely easy and quick
Within the scope of this aim, a particular object of the invention
is to provide a faceplate in which the flap opens gradually without causing undue
impacts or snap actions.
Another object of the present invention is to provide a faceplate
which by virtue of its particular constructive characteristics is capable of giving
the greatest assurances of reliability and safety in use.
Another object of the present invention is to provide a faceplate
for electrical master boxes that can be easily obtained starting from commonly
commercially available elements and materials and is furthermore competitive from
a merely economical point of view.
This aim, these objects, and others which will become apparent hereinafter
are achieved by a faceplate for electrical master boxes with openable flap, according
to the invention, comprising a frame that can be coupled to a supporting box for
electrical components and having a cover that can be overturned and can be arranged
in the region affected by said electrical components, characterized in that it
comprises elastic means for overturning said cover to open it, as well as friction
means adapted to slow down the opening rotation of said cover.
Further advantages of the invention will become apparent from the
following detailed description of a faceplate for electrical master boxes, with
openable flap, illustrated only by way of non-limitative example in the accompanying
- figure 1 is a schematic perspective view of the faceplate according to the
invention, with the cover in open position;
- figure 2 is a front view of the faceplate, with the cover in closed position;
- figure 3 is a sectional view, taken along a plane III-III of figure 2;
- figure 4 is a sectional view, taken at the plane IV-IV of figure 2;
- figures 5 and 6 are sectional views, taken along the plane V-V of figure 2,
in the open position and in the closed position respectively;
- figure 7 is a cutout view of the detail of the pivoting of the cover to the
faceplate frame, in the region where the elastic means act;
- figure 8 is a schematic sectional view, taken along the plane VIII-VIII of
- figure 9 is a view of the opening button, seen from the rear face;
- figure 10 is a view of means for detachably retaining the cover in the closed
With reference to the above figures, the faceplate for electrical
master boxes with openable flap, according to the invention, which is generally
designated by the reference numeral 1, comprises a frame 2 that can be coupled
in a known manner to a box for electrical components and has a region 3 for accommodating
the various electrical components, which can be constituted by differential circuit
breakers, magnetothermal circuit breakers, other signalling elements, or other
The region 3 is closed by a cover 10 that is pivoted to the frame
2 so that it is available in a closure position, in which it substantially conceals
the region affected by the various electrical components, and in an open position,
in which it allows access to said components.
The particularity of the invention is constituted by the fact that
means are provided which allow to automatically open the cover 10.
Said means are constituted by at least one coiled spring 20 that
is wound around the pivot 21 that allows the mutual pivoting of the cover 10 and
of the frame 2 and has one end 20a that acts against the cover 10 and another end
20b that acts against the frame 2.
In order to achieve gradual opening, there are provided friction
means, generally designated by the reference numeral 30, which have a first gear
31 that meshes with a circular rack-like portion 32 that is rigidly coupled to
the cover 10 and is centered on the rotation axis of the cover 10.
The friction device 30, which is a per se known component, has a
disk-like element that rotates rigidly with the gear 31 and moves in a bath of
oil or of another highly dense liquid.
The faceplate furthermore comprises an opening element, generally
designated by the reference numeral 40, which is constituted by a button 41 that
can be accessed on the faceplate and acts on a rocker lever 42 which pushes, at
the other end, a pusher pin 43 that is elastically contrasted by a return spring
44 that engages one end of the flap 10 that is opposite to the pivoting end so
as to space it in such a manner as to overcome the action that keeps the flap closed,
which can be provided by virtue of elastic teeth or by means of a permanent magnet
50 that is accommodated in the faceplate and engages a ferromagnetic part 51 that
is connected to the cover 10.
With the described arrangement, during closure of the cover, in practice
the coiled spring 20 is loaded and the cover 10 remains closed due to the action
of the retention means.
When one wishes to open the cover 10, it is sufficient to act on
the button 41 which, by virtue of the above-described kinematic system, produces
a first spacing of the cover from the faceplate, with consequent automatic opening
produced by the coiled spring 20, which opens the cover 10 with a gradual movement
due to the braking action applied by the friction means 30.
From the above description, it is thus evident that the invention
achieves the intended aim and objects, and in particular the fact is stressed that
a faceplate is provided in which cover opening is achieved automatically, in a
gradual and uniform manner.
In practice, the materials employed, so long as they are compatible
with the specific use, as well as the contingent shapes and dimensions, may be
any according to the requirements.
Where technical features mentioned in any claim are followed by reference
signs, those reference signs have been included for the sole purpose of increasing
the intelligibility of the claims and accordingly, such reference signs do not
have any limiting effect on the interpretation of each element identified by way
of example by such reference signs.