The present invention relates to a sealed door for cabinets containing
electrical equipment. It is known that a lot of electrical equipment, such as the
electric consoles for distribution and/or control of electric energy, are normally
installed inside metal containers which are mounted on the ground or wall or are
inset and which are provided with one or more internal compartments and a front
door for access to the equipment.
It is also known that these doors are made by means of stamped metal
sheets, or using profiled members, cut with their ends inclined at forty five degrees
and connected together by means of internal reinforcements so as to form a perimetral
frame supporting a central glass panel or the like.
Said doors must comply with the various safety standards, including
that of providing a seal against infiltration of water, dust or the like so as
to avoid the risk of short-circuits and/or damage to the electrical equipment
mounted inside the container.
The technical problem which is posed, therefore, is that of providing
a door for cabinets and/or similar containers for electrical equipment which is
sealed, both at the joint between the glass and frame of the door and at the point
of internal contact of the door with the frame of the container.
Within the scope of this technical problem a further requirement
is that the door should consist of a limited number of parts which can be assembled
with one another and disassembled with ease so as to facilitate any maintenance
operations, such as for example the replacement of the central panel, and reduce
production costs, but at the same time ensure a high degree of rigidity of the
door itself which prevents possible warping thereof which would result in discontinuous
contact of the door such as to cause loss of the sealing effect.
In addition, it is required that the door assembled and fitted to
the container should permit an external finish such that it may have a pleasing
These results are obtained by the present invention which provides
a sealed door, for containers of electrical equipment and the like, comprising
a perimetral frame consisting of profiled members connected together by means
of angular joints and a panel fixed on said frame, in which each of said joints
consists of a substantially parallelepiped member, with at least two surfaces
which are adjacent to one another and from which there extend outwards male members
designed to be engaged with associated cavities of the said profiled members to
which they can be secured via associated locking means, on the inner front surface
of said joints there being formed at least two seats for housing a corresponding
section of associated sealing gaskets, extending along the entire perimeter of
the frame and housed in corresponding seats of said profiled members.
Further details may be obtained from the following description of
an example of embodiment of the invention, provided with reference to the accompanying
drawings, in which:
- Figure 1 shows an exploded view of a sealed door according to the present invention;
- Figure 2 shows a plan view from the inner side of the door according to Fig.
- Figure 3 shows a cross-section along the plane indicated by III-III in Fig.
- Figure 4 shows a container with the door mounted and in a partially open position.
As shown in the Figures, the door according to the invention is composed
of a perimetral frame 1 designed to support and retain a central panel 30 and consisting
of profiled members 10 connected together by means of angular joints 20.
More particularly, the profiled member 10 comprises at least one
first part 10a extending in the longitudinal direction and having a substantially
square cross-section, for abutment against a corresponding frame 40a of a container
40 (Fig. 4), and at least one flange 10b, extending laterally with respect to said
first part 10a and over the entire length of the profiled member, which flange
is designed to form a support base for a glass pane 30.
Said part 10a of the profiled member has an internal cavity 10c extending
longitudinally along its entire length.
The internal front surface of said first part 10a has formed on it
a seat 11 with a substantially semi-circular cross-section, which extends in the
longitudinal direction along the entire length of the profiled member and which
partially contains inside it a gasket 12 made of rubber or similar material, designed
to provide the required seal between door and container 40 once the door is closed
up against the container itself.
As can be seen from Fig. 3, said seat 11 has upper ends 11a of its
wall 11b extending beyond the ideal line corresponding to the diameter of the seat
11; in this way the gasket 12, which has a diameter equal to the diameter of the
seat 11, may be forced into the seat itself and stably retained therein by said
ends 11a of the wall 11b.
A similar seat 13 extending in the longitudinal direction is formed
in the region of the free edge 10d of the said flange 10b of the profiled member
intended to be joined to the glass 30 and in this case also the seat 13 has ends
13a of its wall 13b extended beyond the diameter of the seat so as to allow retention
of an associated gasket 14 designed to effect the seal between the perimetral frame
1 and the glass 30.
The profiled member 10 also has additional longitudinal grooves 16
and 17 respectively formed on the inner side of the part 10a of the profiled member
and in the vicinity of the free edge 10d of the flange 10b, but in a more inward
position than the seat 13 of the gasket 14 on which the glass 30 rests. Said grooves
16 and 17 are arranged along planes substantially perpendicular to one another
and allow the internal edge 18a of a cover-piece 18 substantially in the form of
an overturned "L" to be respectively guided and retained and to be engaged with
a self-threading screw 19 for locking said cover-piece, by means of which perimetral
locking of the glass 30 on the assembled frame is achieved.
The force exerted by the screw 19 moreover allows the gasket 14 arranged
between the profiled member 10 and the glass 30 to be compressed so as to obtain
the desired seal in addition to said locking action.
As illustrated, the profiled members 10 are joined together by means
of angular joints 20 comprising a body 21 with a substantially square shape in
plan view and a cross-section corresponding to that of the profiled members 10.
From the surface of each of the two inner sides 22a, 22b of the joint
20, adjacent to one another, there extends a male member 22 which is substantially
cube-shaped and designed to be inserted into the corresponding cavity 10c of the
profiled member 10 until the latter comes into contact against the respective
surface 22a, 22b of the joint itself.
Said male member 22 has formed on its upper surface a threaded hole
22c which, once the joint has been engaged, is arranged coaxially with respect
to a corresponding through-hole 15 in the profiled member 10 so as to allow relative
locking by means of a screw 23.
The joint 20 also has formed on it a first seat 21, consisting of
two straight sections 21a arranged at 90° with respect to one another and connected
by a curved section 21b, corresponding to the seat 11 of the profiled member,
allowing the continuity thereof to be maintained along the entire perimeter of
the frame 1 once the latter has been assembled, this continuity allowing the sealing
gasket 12 to be housed and firmly retained along its whole length.
At the outer corner 24 of the joint 20 there is also arranged a hinge
element 25 fixed to the joint by means of screws 25a, said hinge element 25 allowing
the door and container to be rotationally joined together as well as mounting
for right-hand or left-hand doors.
At the inner corner 26 of the joint there are also provided two triangular
seats 26a and 26b respectively designed to form a locating abutment for positioning
of the glass 30 and the seat for a block 27 for retaining a corner 31 of the glass
30, which block has two extensions 27a and 27b perpendicular to one another and
designed to be arranged inside said grooves 17 where they are locked by the respective
The internal surface of said corner 26 of the joint also has formed
in it an additional seat 28 consisting of two straight sections 28a connected by
a curved section 28b and corrresponding to the seat 13 for retaining the gasket
14, which seat is therefore also stably positioned at the corner of the joint,
enabling the continuity of the seal to be maintained by means of the pressure
exerted by the block 27 mentioned.
It is therefore obvious how the door according to the invention allows
the desired sealing of the container to be obtained by means of a combination of
parts which are structurally simple and may be easily assembled so as to form
an extremely rigid frame without the need for additional reinforcements inside
the profiled members. Said rigidity also allows the fitting, on the door, of transparent
or opaque panels of limited thickness and weight, as well as glass panes or panels
of considerable thickness necessary for helping achieve the overall rigidity of
Many variants may be introduced as regards the realization of the
parts which make up the invention, without thereby departing from the protective
scope of the present invention as defined by the claims which follow.