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(11) | EP 3 597 850 A1 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | APPARATUS FOR MAKING AND MOUNTING A SLIDING PANEL FOR DOORS AND WINDOWS |
| (57) Apparatus for making and mounting a sliding panel for doors and windows, preferably
suitable for acting as mosquito net; wherein said panel cooperates with a box guide
with support and slide function according to modes that simplify and accelerate the
adjustment of the position of said panel relative to the box guide, which is suitably
fixed to the lintel of a door or of a window.
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[0001] The present patent application for industrial invention relates to an apparatus for making and mounting a sliding panel for doors and windows, preferably consisting in a mosquito net.
[0002] The peculiarities and the advantages of the present invention will become evident after a short description of the prior art and of its specific drawbacks.
[0003] Sliding mosquito nets for doors and windows have been available for long on the market, each of them basically consisting in a panel formed of a frame with a preferably rectangular shape, which is suitable for centrally supporting a portion of close mesh net.
[0004] Such a panel slides relative to the opening of a door or of a window, in such a way to alternatively go from an operating position, wherein it blocks the passage of the door or of the window, preventing the penetration of insects, to a non-operating position, wherein it frees the passage of the door or of the window after sliding in lateral direction.
[0005] According to the most common embodiments of sliding mosquito nets, the frame is provided on its upper crossbar with two wheels that revolve in idle on cylindrical rods that are mounted in projecting position; it being provided that said wheels are parallel to the surface of said crossbar and project towards the door or the window.
[0006] Said wheels cooperate with a horizontal box guide with a preferably square section, which is mounted at the height of the lintel of the door or of the window in order to let the panel slide alternately relative to the passage of the door or of the window.
[0007] In view of the above, the side of the box guide opposite the mosquito net is provided with a central longitudinal slot that intersects two circular holes; it being provided that:
- the slot of said box guide is suitably dimensioned to receive the cylindrical rods of the two wheels of the mosquito net, with possibility of sliding,
- the two holes of said box guide are spaced by exactly the same distance as the wheels mounted on the upper crossbar of the mosquito net
- said holes are suitable for being exactly penetrated by the two wheels of the mosquito net and are spaced by the same distance as the two support rods of said wheels,
- after being inserted in the box guide through the two holes, the wheels of the mosquito net can slide alternately, using the lower horizontal wall of the box guide as supporting surface.
[0008] It appears evident that in order to move such a mosquito net, the user simply needs to push the mosquito net in either direction because such a simple movement will rotate the two wheels of the mosquito net - which will now act as a trolley - inside the box guide that is fixed at the height of the lintel.
[0009] In spite of its large popularity, such a consolidated technology is not completely devoid of drawbacks, the first one being the complicated manipulation of such a sliding mosquito net when it is installed for the first time and when its position is adjusted.
[0010] In fact, the box guide that cooperates with the mosquito net may be not perfectly horizontal because of defective mounting or because the lintel where it is fixed is not perfectly disposed at a right angle.
[0011] Evidently, the non-perfectly horizontal position of the box guide will impair the position of the mosquito net, which will be not disposed at a right angle.
[0012] Moreover, such a non-perfectly horizontal position of the mosquito net can be visually detected only after mounting the mosquito net on the box guide.
[0013] In view of the above, the mosquito net must be disassembled in order to adjust its position relative to the lintel in order to be finally disposed at a right angle.
[0014] The operations that are currently necessary to adjust the position of the panel will be illustrated in detail in the following description.
[0015] However, it must be noted that the most critical aspect of such an adjustment operation of the position of the sliding panel is related to the fact that it is necessary to disassemble the sliding panel from the box guide, in a condition that requires a significant amount of attention and a considerable physical effort because the user must lift and hold the panel when it is disassembled (to extract the wheels of the mosquito net from the holes of the box guide) and when it is re-assembled (to exactly insert the two wheels in the holes of the box guide).
[0016] A careful observation of this problem has resulted in the disclosure of the present invention, the main purpose being to obtain a sliding panel that can be installed easily and firmly, and that especially cooperates with practical and effective means to adjust its position, in such a way that the operator can dispose the sliding panel always at a right angle relative to the box guide, without having to remove the sliding panel from its operating position.
[0017] Such a purpose is achieved with the modular apparatus that is described and claimed hereinafter.
[0018] For the sake of clarity, the description of the invention continues with reference to the appended drawings, which have a merely illustrative, not limiting value, wherein:
- Fig. 1 is an axonometric view of a sliding panel that is obtained with the apparatus of the invention;
- Figs. 1A, 1B and 1C are sectional views of Fig. 1, respectively cut along the planes A-A, B-B and C-C;
- Fig. 2 is a cross-sectional view of one of the metal sections used for the frame of said panel;
- Fig. 3 is a cross-sectional view of the box guide that is suitable for cooperating with the upper crossbar of said panel;
- Fig. 4 is an axonometric view of one of the upper corners of the frame of said panel;
- Fig. 5 is an axonometric view of the corner of the panel of Fig. 4, shown in cooperation with said box guide;
- Fig. 6 is an exploded view of Fig. 5;
- Fig. 7 is an axonometric view of a section of the lower crossbar of the panel, together with a corresponding section of the strip with guiding and siding function that is fixed to the floor;
- Fig. 8 is a view of a specimen of the first square, which is suitable for cooperating with the upper crossbar of said panel;
- Fig. 8A is an exploded view of Fig. 8;
- Fig. 9A, 9B and 9C are three views of a specimen of the second square, which is suitable for cooperating with the lower crossbar of said panel.
[0019] With reference to the aforementioned figures, the apparatus of the invention comprises the following parts.
[0020] The first part consists in a sliding panel (1) provided with a frame formed of two uprights (100), an upper crossbar (101) and a lower crossbar (102) obtained with metal sections mounted at right angle with the interposition of connection and fixing squares (S) with traditional configuration and operation.
[0021] Said uprights (100) and said two crossbars (101, 102) are provided with identical longitudinal grooves (100a, 101a, 102a) that are perfectly joined at right angle and obtained on the external perimeter of said panel (1).
[0023] For this reason, each of said grooves (100a, 101a, 102a) comprises:
- a longitudinal bottom wall (103)
- two lateral edges (104) that protrude perpendicularly from the sides of said bottom wall (103)
- a longitudinal opening (105) that is defined by the free borders (104a) of said edges (104), which are shortly directed one towards the other; it being provided that the width (z-z) of said longitudinal opening (105) is lower than the width (x-x) of said longitudinal bottom wall (103), as expressly shown in Fig. 2.
[0024] The grooves (101a, 102a) provided in said two crossbars (101, 102) can be accessed at each end by means of corresponding lateral recesses (101a', 102a') obtained at the ends of each one of said uprights (100); in this respect, reference is made to the observation of Fig. 6.
[0025] Moreover, it must be noted that the frame of the panel (1) centrally supports a net that acts as mosquito net, or alternatively a glass.
[0026] The second part of the apparatus according to the present invention consists in a box guide (2) that is open at the ends and has a length that is practically double than the length of the two said crossbars (101, 102) of the panel (1), as shown in Fig. 1.
[0027] Said box guide (2) is suitable for being mounted under the lintel of the door or of the window provided with a sliding mosquito net.
[0028] With reference to Fig. 1A, said box guide (2) is has a downward longitudinal groove, with a substantially C-shaped cross-section and downward concavity, being defined by an upper horizontal wall (24) and two vertical edges (21) that project from the lateral borders of said top wall (24).
[0029] Each of said vertical edges (21) supports a longitudinal grooved track (22) with horizontal direction, which is disposed in projecting position at the lower end (21a), said longitudinal grooved track (22) projecting towards the interior of the box guide (2); it being also provided that the two grooved tracks (22) define a central longitudinal notch (23).
[0030] The task of said box guide (2) is to cooperate with the upper crossbar (101) of said panel (1) in such a way that the panel (1) can be in a correct right-angle position and make alternate opening or closing travels relative to the door or to the window provided with the box guide (2).
[0031] The specific modes of said cooperation will be illustrated in the following description. It must be noted that said upper crossbar (101) of the panel (1) must be positioned under said box guide (2), in such a way to perfectly interface said longitudinal opening (105) of said crossbar (101) with said longitudinal notch (23) of said box guide (2), as expressly shown in Fig. 1A.
[0032] Moreover, it must be noted that said box guide (2) also cooperates with a compensation section (200), which basically consists in a metal profile with overturned "U"-shaped section and is suitable for being fixed to the wall in correspondence of the lintel of said door or window.
[0033] As a matter of fact, said box guide (2) is provided in upper position with longitudinal ribs (210) suitable for being exactly engaged in said concave lower side of the compensation section, when the box guide (2) is used.
[0034] Such a coupling between box guide (2) and compensation section (200) is stabilized by firmly fixing the compensation section (200) under the lintel with a set of screws (not shown in the appended figures).
[0035] Likewise, the box guide (2) is fixed to the lintel with a corresponding set of screws (201) that are inserted from the bottom upwards through corresponding holes (24a) obtained on the upper horizontal wall (24) of the box guide (2).
[0036] In such a situation, before being engaged in the masonry of the lintel, said screws (201) also penetrate the upper flat wall (200a) of said compensation section (200); such provisions can be verified through the combined observation of Figs. 1A and 3.
[0038] Each one of said screws (201) must be inserted in the box guide (2) through said longitudinal notch (23) provided in the box guide (2) on the downward-facing side, until the head of said screw (201) is stopped against the lower surface of said horizontal wall (24) of the box guide (2).
[0039] It must be noted that, in addition to fixing the box guide (2) to the lintel, said screws (201) are the adjustment means that can be used to dispose the box guide (2) in a perfectly horizontal position, also when said lintel is not perfectly disposed at right angle.
[0040] Considering that the box guide (2) is the fixing and sliding point for said panel (1), it is evident that if the box guide (2) is not capable of being in a perfectly horizontal position, also the position of the panel (1) will be irremediably impaired.
[0041] Said adjustment screws (201) can be actuated by inserting a screwdriver from the bottom upwards inside the box guide (2) through said longitudinal notch (23) provided in the box guide (2).
[0042] The third part of the apparatus according to the invention consists in a metal strip (3) suitable for being fixed to the lintel of the door or of the window in perfect alignment with said box guide (2) mounted in the lintel of the door or of the window, and having the same length.
[0043] In particular, said strip (3) is provided in upper position with a rectilinear longitudinal rib (3a) that is suitable for being disposed in a perfectly aligned position relative to the position of said longitudinal notch (23) in the box guide (2).
[0044] The function of said strip (3) is to be coupled with the lower crossbar (102) of said panel (1), in such a way to act as an additional guiding and sliding element of the panel (1) in opening position and in closing position. The specific modes of said coupling will be illustrated shortly.
[0045] The fourth part of the apparatus according to the invention consists in a first square (4) that comprises a horizontal segment (4a) joined at right angle with a vertical segment (4b).
[0046] The horizontal segment (4a) of said first square (4), which is suitably provided with a rectangular section, is exactly inserted in one of the ending sections of said groove (101a) provided in the upper crossbar (101) of the panel (1), using one of said lateral recesses (101a') provided at the ends of said groove (101).
[0047] In view of the above, the height (H) of the horizontal segment (4a) is substantially equal to the distance (y-y) between the bottom wall (103) of the corresponding groove (101a) and the two borders (104a) that define the longitudinal opening (105), whereas the width (L) is substantially equal to the width (x-x) of the bottom wall (103) of said groove (101a) and is consequently lower than the width (z-z) of said longitudinal opening (105) of said groove (101a); the dimensional ratios between the aforementioned parts can be verified by means of the combined observation of Figs. 2 and 8A.
[0048] In particular, the higher width of the horizontal segment (4a) of said first square (4), compared to the width of the longitudinal opening (105) of the groove (101a) prevents the first square (4) from coming out of its corresponding groove (101a) through said longitudinal opening (105).
[0049] Moreover, it must be noted that said horizontal segment (4a) is provided in upper position with a cylindrical tubular rod (40), which is preferably obtained in one piece on the first square (4).
[0050] An axis (41a) is orthogonally mounted on the top of said rod (40), and is suitable for rotating freely relative to the rod (40); it being also provided that an equal number of idle wheels (41) is mounted in parallel position at the two ends of said axis (41a).
[0051] Preferably, the fixing of said axis (41a) on the top of the rod (40) is obtained by means of a screw with vertical axis (42) suitable for cooperating with a tightening nut (43), as shown in Fig. 8A.
[0052] In fact, said screw (42) penetrates said rod (40) from the bottom upwards, taking advantage of the provision of an access hole that passes through said horizontal segment (4a) of the first square (4).
[0053] The length of said screw (42) is such that, when its enlarged head is stopped against the perimeter borders of said access hole, its tip can end above said tubular rod (40), after crossing a suitable hole (41a') that is perpendicularly obtained through said revolving axis (41a) used to support the wheels (41).
[0054] In such a way, the tip of said screw (42) can be helically coupled with said tightening nut (43) disposed on said axis (41a) of the wheels (41).
[0055] It must be noted that the diameter of said tubular cylindrical rod (40) is lower than the width of the longitudinal opening (105) of said groove (101 a) of the upper crossbar (101) of the panel (1).
[0056] Therefore, when said horizontal segment (4a) of the first square (4) is inserted in the groove (101a), the vertical rod (40) can slide freely along the longitudinal opening (105) of the groove (101a), in such a way that its pair of wheels (41) projects above said upper crossbar (101) of the panel (1).
[0057] Furthermore, it must be considered that the diameter of said vertical rod (40) that projects from the horizontal segment (4a) of the first square (4) is also lower than the width of the longitudinal notch (23) provided in said box guide (2) that is suitable for being fixed in the lintel of a door or of a window.
[0058] Likewise, it must be noted that said two wheels (41) provided on top of said cylindrical rod (40) are suitable for being inserted and alternatively sliding inside the grooved tracks (22) internally provided in the box guide (2), according to cooperation modes that will be illustrated hereinafter in detail.
[0059] The vertical segment (4b) of said first square (4), which is provided with a basically rectangular section, is designed to act as end-stop means for the insertion of the horizontal segment (4a) in said groove (101 a') of the upper crossbar (101 a) of the panel (1).
[0060] Such an end-stop effect occurs when said vertical segment (4b) is stopped against the bottom wall (103) of the groove (100a) of one of the two uprights (100) of the panel (1); it being provided that such a deep penetration of the vertical segment (4b) of the first square (4) in the groove (100a) is permitted by the fact that the width (L1) of said vertical segment (4b) is lower than the width (z-z) of the longitudinal opening (105) of said groove (100a).
[0061] Said vertical segment (4b) is also provided with a circular through hole (4b') for the insertion of a self-tapping screw suitable for engaging in said bottom wall (103) of said groove (100a) of one of the uprights (100) of the panel (1), thus stabilizing the operating position of the first square (4) relative to the sliding door (1).
[0062] The fifth part of the apparatus according to the invention consists in a second square (5) with the same structure and dimensions as the first square (4), which is suitable for cooperating with one of the ends of the groove (102a) provided in the lower crossbar (102) of the panel (1).
[0063] Also the second square (5) comprises a horizontal segment (5a) and a vertical segment (5b), which are practically identical to the corresponding segments (4a, 4b) of the first square (4).
[0064] As a matter of fact, the horizontal segment (5a) of said second square (4) is suitable for being firmly inserted in one of the ends of said groove (102a) of the lower crossbar (102) of the panel (1), after passing through the lateral recess (102a').
[0065] Likewise, the vertical segment (5b) is the end-stop means for the insertion of the horizontal segment (5a) in the groove (102a) when it is stopped against the bottom wall (103) of the groove (100a) of one of said uprights (100) of the panel (1).
[0066] Also in this case, said vertical segment (5b) is provided with a circular through hole (5b') for the insertion of a self-tapping screw suitable for engaging in said bottom wall (103) of said groove (100a) of one of the uprights (100) of the panel (1), thus stabilizing the operating position of the second square (5).
[0067] The peculiarity of the second square (5) consists in the fact that its horizontal segment (5a) is provided in lower position with a pair of longitudinal edges (5a') spaced by a distance (L2) that is lower than the width (z-z) of the longitudinal opening (105) of said groove (102a) of the lower crossbar (102) of the panel (1).
[0068] In view of the above, the two edges (5a') of the second square (5) protrude through said longitudinal opening (105) under the lower crossbar (102) of the door (1).
[0069] In such a condition, the two edges (5a') can embrace from opposite sides, from up downwards, the longitudinal rib (3a) that projects from the surface of said strip (3) fixed to the floor.
[0070] A similar exact coupling between the edges (5a') of the second square (5) and the rib (3a) of the strip (3) contributes to the stability and correctness of the alternate sliding movements of the panel (1) because of a similar cooperation between the lower crossbar (102) and the strip (3).
[0071] After illustrating the structure of the various parts of the apparatus according to the invention, this description continues by illustrating the sequence of installation operations and the cooperation mode of the different parts.
[0072] First of all, the compensation section (200), which is fixed to said box guide (2), is fixed under the lintel of a door or of a window.
[0073] Successively, two specimens of said first square (4) are mounted on said box guide (2), inserting each one of said first squares (4) through one of the lateral ends of the box guide (2).
[0074] In particular, the two wheels (41) disposed on the horizontal segment (4a) of each first square (4) must penetrate the box guide (2) and must be exactly coupled with said grooved tracks (22) provided in the box guide (2).
[0075] At the end of such an operation, the tubular rod (4) that protrudes upwards from each first square (4) in order to support the corresponding pair of wheels (41) is slidingly inserted in the longitudinal notch (23) of said box guide (2), whereas the horizontal segment (4a) is disposed under and out of said box guide (2).
[0076] The vertical segments (4b) of the two first squares (4) protrude downwards relative to the box guide (2), substantially at the two ends of the box guide (2).
[0077] Then, the box guide (2), which is already provided with two specimens of said first square (4), is mounted under the compensation profile (200) that is already fixed to the lintel; it being provided that a similar operation is made by means of the screws with vertical axis (201).
[0078] Now, the panel (1) is practically "hung" to said two first squares (4) that are already coupled with the box guide (2).
[0079] Therefore, the horizontal segments (4a) of the two first squares (4) are inserted through the recesses (101a') in the two ends of the groove (101a) of the upper crossbar (101) of the panel (1), until the two vertical segments (4b) are stopped against the bottom wall (103) of the grooves (100a) of the two uprights (100) of the panel (1), where they are fixed with the self-tapping screws.
[0080] On the other hand, the horizontal segments (5a) of the two second squares (5) must be inserted through the recesses (102a') in the two ends of the groove (102a) of the lower crossbar (102) of the panel (1), until the two vertical segments (5b) are stopped against the bottom wall (103) of the grooves (100a) of the two uprights (100) of the panel (1), where they are fixed with the self-tapping screws.
[0081] Moreover, it must be noted that the four sections used to make the frame of the panel (1) are provided on the sides of said longitudinal openings (100a, 101a, 102a) with two thin rectilinear grooves (111), each one of them being preferably suitable for forcedly housing a dust proof brush seal (112) that prevents the penetration of dust.
[0082] In view of this description, the specific advantages of the apparatus according to the invention compared to the prior art can be easily understood.
[0083] Firstly, it must be noted that the positioning of the panel (1) in the two supporting and guiding points, which are represented by said box guide in upper position (2) and said strip (3) mounted on the floor, is extremely easy.
[0084] An additional advantage of said apparatus is represented by the fact that the position of the panel (1) can be adjusted rapidly and comfortably, in such a way to correctly dispose the panel (1) at right angle also when the lintel with the box guide (2) and the compensation section (200) is not perfectly horizontal.
[0085] In view of the above, it must be noted that the prior art provides for the possibility of adjusting the position of a sliding panel, in such a way that the sliding panel is perfectly positioned at right angle; it being provided, more precisely, that the part used for adjusting the position is not the panel (1), but the box guide (2) where the upper crossbar (101) of said panel (1) is to be "hung".
[0086] As mentioned above, like some expressions of the prior art, also the apparatus of the present invention provides for the possibility of adjusting the position of the box guide (2) by means of the screws (201) that are screwed in the masonry of the lintel.
[0087] It must be noted that such an adjustment of the position of the box guide (2) can be performed only after uncoupling the panel (1) from said box guide (2); this is done in order to free the box guide (2) from the weight discharged by the panel (1) in its operating position.
[0088] In such a context, the real advantage of the apparatus according to the present invention compared to the prior art consists in the fact that the removal of the panel (1) from the box guide (2) is more rapid and more practical, when the user needs to use the adjustment screws (201) of said box guide (2).
[0089] The drawbacks that are encountered in the prior art when the user needs to disassemble the crossbar of a sliding panel - of the type provided with a pair of wheels that protrude on the side of the panel towards the box guide - from the box guide have been already illustrated in the premise, saying that the worst inconvenience is caused by the fact that the disassembling of a traditional panel from the box guide requires the user to manually move and support the heavy panel for the entire time that is necessary to remove the panel from the box guide, adjust the screws of the box guide and replace the panel on the box guide.
[0090] On the contrary, with the panel (1) according to the apparatus of the invention, similar operations are easier and less demanding for the operators.
[0091] In fact, in order to disassemble the panel (1) from the box guide (2), it is simply necessary to remove the screws used to fix said vertical segments (4b) of the pair of said first squares (4) on the sides of the upper crossbar (101) of the panel (1).
[0092] During such a disassembling operation, and for the entire time that is necessary to adjust the screws (201) provided in the box guide (2), it is not necessary to support the weight of the panel (1) because the lower crossbar (102) remains advantageously positioned and coupled with the strip (3) that is fixed to the floor.
- a panel (1) provided with a frame formed of four metal sections disposed at right angle, respectively acting as upper crossbar (101), lower crossbar (102) and uprights (100)
- a compensation section (200) with overturned "U"-shaped section, suitable for being fixed under to the lintel of a door or of a window by means of screws with horizontal axis
- a box guide (2) that is open at the ends and suitable for being joined in upper
position with said compensation section (200), and fixed to said lintel by means of
fixing and adjustment screws with vertical axis (201) suitable for crossing said compensation
section (200); wherein said box guide (2) is also suitable for being joined in lower
position to the upper crossbar (101) of said panel (1), with the interposition of
means (4) that provide the support and the alternative sliding of the panel (1) relative
to the box guide (2);
apparatus characterized in that
- said uprights (100) and said upper crossbar (101) of the panel (1) are provided with longitudinal grooves (100a, 101a) that are joined at right angle; wherein said grooves (100a, 101a) have a substantially "C"-shaped cross-section and a longitudinal opening (105) with width (z-z) lower than the width (x-x) of said grooves (100a, 101a) in the bottom wall (103); wherein the groove (101a) provided in said crossbar (101) of the panel (1) is accessible at the two lateral ends by means of two recesses (101 a') obtained in the upper ends of each of said uprights (100)
- said box guide (2) has a substantially "C"-shaped cross-section with downward concavity, being defined by an upper horizontal wall (24) and two vertical edges (21) that project from the borders of said horizontal wall (24) and support grooved longitudinal tracks (22) in projecting position in the lower edge (21a) and towards the interior of said box guide (2), said grooved longitudinal tracks (22) being suitable for defining a longitudinal notch (23) in intermediate position
- said upper crossbar (101) of the panel (1) is suitable for being exactly disposed under said box guide (2), in such a way to perfectly interface said longitudinal opening (105) of said crossbar (101) with said longitudinal notch (23) of said box guide (2)
- said supporting and sliding means of the upper crossbar (101) of the panel (1) relative to the box guide (2) consist in two specimens of a first square (4) formed of a vertical segment (4b) with a through hole (4b') and a horizontal segment (4a) from where a vertical rod (40) projects in upper position, supporting a perpendicular axis (41a), at the ends of which two idle wheels (41) are pivoted in parallel direction; wherein the horizontal segment (4a) of each specimen of said first square (4) is suitable for being exactly inserted through one of said lateral recesses (101a') obtained on the upright (100) inside one of the ends of the groove (101a) of said upper crossbar (101) of the panel (1), in such a condition that said rod (40) that projects in upper position from said horizontal segment (4a) of the first square (4) is exactly inserted, with possibility of sliding freely, in the longitudinal opening of the groove (101a) of the upper crossbar (101) and in the longitudinal notch (23) of the box guide (2), whereas the two wheels (41) that project from the top of said rod (40) are exactly inserted, with possibility of sliding freely, in the two grooved tracks (22) provided on the box guide (2) on the two sides of said longitudinal notch (23); wherein said vertical segment (4b) of each of said first squares (4) is suitable for penetrating through the longitudinal notch (100a') of the groove (100a) of the upright (100) of the panel (1) when the horizontal segment (4a) is completely inserted in the groove (101a) of the upper crossbar (101) of the panel (1), until reaching the bottom wall (103) of said groove (100a) where it is fixed with a screw suitable for crossing said hole (4b').
- wherein the lower crossbar (102) of said panel (1) is provided with a longitudinal groove (102a) that corresponds to said grooves (101a, 100a), and is accessible on the two sides through two corresponding recesses (102a') obtained at the lower ends of each of said uprights (100) ;
- wherein two specimens of a second square (5) with the same shape and dimensions as the first square (4) are provided, said second square (5) being formed of a vertical segment (5b) with a through hole (5b') and a horizontal segment (5a) under which two parallel edges (5a') protrude downwards; wherein the horizontal segment (5a) of each of said second squares (5) is suitable for being exactly inserted in one of the ends of the groove (102a) of said lower crossbar (102) of the panel (1) through one of said lateral recesses (102a') obtained on the upright (100), in such a way that said edges (5a') protrude under the groove (102a) through the longitudinal opening (103); wherein said vertical segment (5b) of each one of said second squares (5) is suitable for penetrating through the longitudinal notch (100a') of the groove (100a) of the upright (100) of the panel (1) when the horizontal segment (5a) is completely inserted in the groove (102a) of the lower crossbar (102) of the panel (1), until reaching the bottom wall (103) of said groove (100a) where it is fixed with a screw suitable for crossing said hole (5b');
- wherein a strip (3) is provided in order to be fixed to the floor in perfect alignment with said box guide (2), said strip (3) being provided in upper position with a rectilinear longitudinal rib suitable for being comprised between the two edges (5a') of the two second squares (5) and guide the alternate travels of the second squares (5) when the lower crossbar (102) of the panel (1) is exactly brought to its operation position on said strip (3).
- said grooves (100a, 101a, 102a) of the panel (1) have an identical substantially "C"-shaped section defined by a longitudinal bottom wall (103), two lateral edges (104) that protrude perpendicularly from the sides of said bottom wall (103), a longitudinal opening (105) comprised between the free borders (104a) of said edges (104), which face each other shortly
- the height (H) of the horizontal segments (4a, 5a) of said first square (4) and second square (5) is substantially equal to the distance (y-y) between the bottom wall (103) of each of said grooves (100a, 101a, 102a) and the two borders (104a) that define said longitudinal opening (105), and the width (L) is substantially equal to the width (x-x) of the bottom wall (103) of each one of said grooves (100a, 101a, 102a) and consequently larger than the width (z-z) of said longitudinal opening (105) of said grooves (100a, 101a, 102a);
- wherein the width (L1) of the vertical segments (4b, 5b) of said first square (4) and second square (5) is lower than the width (z-z) of said longitudinal opening (105) of said grooves (100a, 101a, 102a).