FR2971537A1 - Device for controlling access of unauthorized persons to cargo loading area defined on e.g. surface, has control unit operating in two positions, where unit allows drive rotation of external door in one of positions - Google Patents

Abstract

The device has an L-shaped internal door (PI1) rotatably mounted on a surface (S) at level of an internal opening (OI) to partially control access to the internal opening. A control unit including a lever (L1) is operated in a position in which the unit allows drive rotation of the internal door, and immobilizes a plane-shaped external door (PE1) in a partially blocking position for an external opening (OE), and in another position in which the unit immobilizes the internal door in a partially blocking position for the internal opening and allows drive rotation of the external door.

Description

The invention relates to devices that make it possible to control access to a loading zone that is defined on a surface having one of its edges. is located at the interface with the vacuum. The term "surface" here means any place on which one can walk and / or drive and which includes an edge located at the interface with the vacuum and protected by a guardrail or railing. It may therefore be a floor or a flat roof or a balcony or an advance of a facade of a building or a building (such as a bridge) or an area of an outdoor site, such as a promontory, cliff or mountain. In order to allow the raising of a load on a surface of the aforementioned type, or the descent of a load located on a surface of the aforementioned type, in a secure manner and by means of a lifting system such as a hoist or a system with pulley (s) or a forklift, it is imperative to provide at the edge of this surface a loading area secured by an access control device. The simplest of these devices comprises at least one door mounted to slide or to rotate at an opening, said outer, defined in a guardrail (or guardrail) and located on an outer side of the loading area. Here "outer side" is understood to mean a side which is situated at the interface with the void, by "inside" a side which is situated on the surface considered opposite the outer side, and by "lateral side" a side which connects the outer side to the inner side.

It will be understood that this very simple device does not ensure the safety of people who intervene in the loading area when the door is in the open position and therefore it does not obstruct the opening.

To improve security, more sophisticated devices have been proposed. Thus, it has been proposed a device comprising a turntable to be placed in front of the outer opening of a loading area and provided with a railing on three-quarters of its perimeter. The turntable and the support rollers must be sized to the loads they will have to bear, their weight can quickly become (very) heavy, and therefore their price can quickly become (very) high. Moreover, the manual operation of such a turntable with its load can quickly require a (very) great effort, including when the rollers have been carefully selected. In addition, if it is desired that the upper face of the turntable is not elevated relative to the surface it equips, it is mandatory to integrate the device in a housing, which can be (very) expensive or impossible to achieve, especially in the case of a suspended surface (such as a balcony). It has also been proposed a device comprising a kind of tilting cage that can obstruct either a portion of the lateral sides and the inner side of a loading zone, or another part of the lateral sides and the outer side of a zone of loading. It will be understood that in one of its two positions (the riskiest) the tilting cage does not prevent access to the outer opening by a lateral side, which does not offer total security. In addition, the tilting of the cage requires a certain height, which is not always available when the surface to be equipped is a floor of a building. In addition, this device is difficult to use or even unusable, when the lifting system is hoist type (or the like) because the tilting cage can cover at least partially the load or the load space. It has also been proposed, in particular in the patent document FR 2540927, an electronic device comprising inner and outer doors retractable by means of jacks and / or motorized axes. Such a device is complex and expensive. In addition, it can only operate when it is powered and can not be operated manually when one of the drive mechanisms of its doors fails.

The invention therefore aims to provide a device that does not have all or part of the aforementioned drawbacks. It proposes more specifically for this purpose a device dedicated to controlling access to a loading area defined on a surface having an edge located at the interface with the vacuum and protected by a guardrail which is interrupted at an opening said outer located on a side said outside the loading area. This control device is characterized in that it comprises: at least one so-called outer door adapted to be rotatably mounted on the surface at the level of the outer opening in order to at least partially control access to the latter, at least one so-called inner door adapted to be rotatably mounted on the surface at a so-called inner opening, situated on an inner side of the loading zone which is placed facing the outer side, in order to control at least partially access to this interior opening, and - control means adapted to be placed in a first position, in which they allow the rotational drive of the inner door and immobilize the outer door in a position at least partially obstructing the outer opening, in a second position, in which they immobilize the inner door in a position at least obstructing the inner opening and allow rotation of the outer door. The control device according to the invention may comprise other features that can be taken separately or in combination, and in particular: it may comprise two external doors capable of being rotated in opposite directions under the control of the control means ; it may comprise two inner doors adapted to be rotated in opposite directions under the control of the control means; - The control means may comprise, firstly, a first lever having an intermediate portion rotatably mounted on a first bar adapted to be fixed to the surface and comprising first and second opposite ends which are secured respectively to inner rods. and externally adapted to allow or prohibit the rotational drive respectively of the inner and outer first doors, and, secondly, a second lever having an intermediate portion rotatably mounted on a second bar adapted to be attached to the surface and comprising first and second opposite ends which are secured respectively to inner and outer rods adapted to allow or prohibit the rotation of the second inner and outer doors respectively; each inner door may comprise a lower portion rotatably coupled to a plate which is provided with a hole adapted to allow the passage of a portion of an inner rod, and each outer door may comprise a lower portion coupled in rotation to a plate which is provided with a hole adapted to allow the passage of a portion of an outer rod; the control means may comprise, on the one hand, a first coupling means arranged either to allow the rotational drive of a first inner door when a second outer door is immobilized in a position partially obstructing the outer opening; either to allow the rotational drive of the second outer door when the first inner door is locked in a position partially obstructing the inner opening, and secondly, a second coupling means arranged either to allow the drive rotating a second inner door when a first outer door is immobilized in a position partially obstructing the outer opening, or to allow rotation of the first outer door when the second inner door is secured in an obstructing position partially the inner opening; the first coupling means can be coupled, on the one hand, to a first part of the second lever, comprising the first end of the latter, and, on the other hand, to a second part of the first lever, comprising the second end; of the last. Similarly, the second coupling means can be coupled, on the one hand, to a second part of the second lever, comprising the second end of the latter, and, on the other hand, to a first part of the first lever, comprising the first end of the latter; the first and second coupling means may each be in the form of a cable sliding in a sheath; - The first and second levers can be adapted to be rotated by pressing a foot of a person; alternatively, at least one of the first and second levers can be fixedly secured to a control bar which is adapted to drive it in rotation; each inner door may have an L shape; each outer door may be substantially flat. Other features and advantages of the invention will appear on examining the detailed description below, and the accompanying drawings, in which: - Figure 1 schematically illustrates, in a perspective view from the outside, an example of a device according to the invention installed on a floor of a building, and in a rest position, before or after use, - Figure 2 schematically illustrates, in a perspective view on the outside, the control device of Figure 1 in a first intermediate position, for example after placement in the loading zone of a load from the stage, in order to lower it, - Figure 3 schematically illustrates, in a front view of the interior, a part FIG. 4 schematically illustrates, in a perspective view on the outside, the control device of FIG. 1 in a second position in FIG. intermediate allowing the removal of a load from the floor and placed in the loading area to lower it, or the placement of a load from a lower level in the loading area. The attached drawings may not only serve to complete the invention, but also contribute to its definition, if any. The invention aims to provide a device (D) for controlling access to a defined loading zone (ZC) in the immediate vicinity of an edge (BD) of a surface (S) located at the interface with the vacuum. In the following, we consider, by way of non-limiting example, that the surface (S) is a floor of a floor of an industrial building where are stored (or stored) parts, equipment and appliances (possibly intended to equip vehicles (possibly of automobile type)). But, the invention is not limited to this application. It concerns indeed any type of surface on which it is possible to circulate on foot and / or in a vehicle and comprising an edge (BD) situated at the interface with the void and protected by a railing or railing (R). It may also be a flat roof or a balcony or an advance of a facade of a building or a building (such as a bridge), or a zone an outdoor site, such as a promontory, a cliff or a mountain. The term "void" here means the space separating the edge (BD) of a first surface (S) (here a floor) from a second surface situated at a level lower than that of the first surface and on which one can either receive a load that is descended from the first surface by means of a lifting system, such as a hoist (or the like), or place a load that must be raised to the first surface by means of a lifting system, such as a hoist (or the like). FIGS. 1 to 4 show schematically an exemplary embodiment of a device D according to the invention responsible for controlling access to a loading area ZC which has been defined on a surface S (here a building floor) whose edge BD is located at the interface with the vacuum and protected by a guardrail R which is interrupted at a so-called external opening OE, located on an outside said side of the loading zone ZC.

Here, the term "outer side" refers to one side of the loading zone ZC which is located at the interface between the surface S and the void, and on the "inside" side of the loading zone ZC which is located on the surface. S opposite the outer side, and "side side" one side of the loading zone ZC which connects the outer side to the inner side. Furthermore, here means "guardrail" (or "guardrail") means of protection which are installed on the BD edge of the surface S to prevent people, loads and possible vehicles from falling to a lower level or floor. It may for example be a rigid structure having transparent portions, as illustrated, or assembled bars, or a wall height adapted. It will be noted that the rail R extends on the lateral sides of the loading zone ZC in order to permanently prohibit access to the latter (ZC) by its two lateral sides. But, in one variant, the fixed structural elements that prevent access to the loading zone ZC by its two lateral sides could be part of the control device D. As illustrated, a control device D, according to the invention, comprises at least one so-called outer door PEi, at least one so-called inner door Pli and control means (Li, TIi, TEi, MPj, Bi).

Note that in the non-limiting example illustrated in Figures 1 to 4 the (control) device D comprises two outer doors PEi (i = 1 or 2) and two inner doors P11. But, the device D could include a single outer door PEi and two interior doors fold, or two external doors PEi and a single inner door fold.

Note also that in the non-limiting example illustrated in Figures 1 to 4 each inner door Pli has an L-shaped, to limit the space required for its drive in rotation between a fully open position and a fully closed position. But each inner door fold could be substantially flat, especially when part of the loading area ZC 3o is located on a balcony. Note also that in the non-limiting example illustrated in Figures 1 to 4 each outer door PEi is substantially flat because it does not pose congestion problem when it is rotated.

But each outer door PEi could have an L shape. Each outer door PEi is intended to be rotatably mounted on the surface S, at the outer opening OE which is defined in the rail R, to control at least partially access to this external OE opening. Note that in the nonlimiting example illustrated in Figures 1 to 4 the two outer doors PEi are installed so as to be rotated in opposite directions under the control of the control means (Li, Tli, TEi, MPj , Bi). Note also that in the non-limiting example illustrated in Figures 1 to 4, the two outer doors PEi open outwardly so that their rotational drive is not hindered by the presence of a load in the area ZC loading. Furthermore, each inner door P11 is intended to be rotatably mounted on the surface S, at a so-called internal opening OI which is located on the inside of the loading zone ZC, and therefore opposite the opening OE exterior, in order to at least partially control access to this inner opening OI. Note that in the non-limiting example illustrated in Figures 1 to 4 the two inner doors Pli are installed so as to be rotated in opposite directions under the control of the control means (Li, Tli, TEi, MPj , Bi). It will also be noted that in the nonlimiting example illustrated in FIGS. 1 to 4, the two inner doors P1 open towards the outside of the loading zone ZC so that their rotation drive is not hindered by the presence of a load in this loading zone ZC. The control means MC are arranged so as to be placed by a person in a first position or in a second position according to the loading phase envisaged or when it is not desired to use the device D. In the first position (illustrated in FIGS. 1 to 3), the control means (Li, Tli, TEi, MPj, Bi) authorize the rotational drive of each inner door P11 and immobilize each external door PEi in a position in which it at least partially obstructs the outer opening OE. It will be understood that in this first position only the inner doors P11 can be opened (see FIG. 1) in order to allow either the placement in the charging zone ZC of a charge originating from the stage S at the beginning of a phase loading device for lowering this load to a lower level by means of a lifting system (not shown), such as for example a hoist, or the removal of the loading zone ZC from a load from a lower stage, at the end of a loading phase intended to mount this load from a lower level to the floor S by means of a lifting system (not shown), such as for example a hoist, or a rest position ( or non-use) in which the device D occupies the least space on the floor S. Note that in this first position the inner doors fold can also be in the closed position (which obstructs the inner opening OI - see Figures 2 and 3), but in this they are not locked in this closed position so that they can be opened at any time. This closed position of the inner Ply doors is an intermediate position that occurs just after placing a load from the floor into the loading area ZC to lower it, or just after placement in the loading area. ZC of a charge from a lower level, in order to extract it and move it on the surface S.

In the second position (illustrated in FIG. 4), the control means (Li, Tli, TEi, MPj, Bi) immobilize each inner door P11 in a closed position in which it at least partially obstructs the inner opening O1 and allows the rotation drive of each outer door PEi.

It will be understood that in this second position only the external doors PEi can be opened (see FIG. 4) in order to allow either the placement in the charging zone ZC of a charge coming from a level lower than that of the stage S , at the beginning of a loading phase intended to mount this load at the level of the stage S by means of a lifting system (not shown), such as for example a hoist or a forklift, or the withdrawal of the loading zone ZC of a load from stage S, at the end of a loading phase intended to lower this load to a level lower than that of stage S by means of a lifting system (no shown), such as a hoist or a forklift. Note that in this second position the outer doors PEi can also be in the closed position (which obstructs the outer opening OE), but in this case they are not locked in this closed position in order to be open at any time. In the nonlimiting example illustrated in FIGS. 1 to 4, the control means (Li, Tli, TEi, MPj, Bi) comprise first L1 and second L2 levers. The first lever L1 is here installed on the right lateral side of the loading area ZC (when facing the inner opening 01). This allows a person to operate it from outside the ZC loading area. This first lever L1 comprises an intermediate portion which is rotatably mounted on a first bar B1 (here substantially vertical) intended to be fixed on the surface S. This first lever L1 also comprises first and second opposite ends, located on both sides. other of its intermediate part, and which are respectively secured to an inner pin (or pin) T11 and an outer pin (or pin) TE1 which are arranged to allow or prohibit the rotational drive respectively of the first inner doors P11 and outdoor PE1.

The second lever L2 is here installed on the left lateral side of the loading area ZC (when facing the inner opening 01). This allows a person to operate it from outside the ZC loading area. This second lever L2 comprises an intermediate portion which is rotatably mounted on a second bar B2 (here substantially vertical) intended to be fixed on the surface S. This second lever L2 also comprises first and second opposite ends, located on both sides. other of its intermediate part, and which are respectively secured an inner rod T12 and an outer rod TE2 which are arranged to allow or prohibit the rotation of the second inner door P12 and outer door PE2 respectively. Note that in the presence of a single inner door and a single outer door the device D could comprise only one lever placed on one of the two lateral sides of the loading zone ZC.

It will also be noted that in the nonlimiting example illustrated in FIGS. 1 to 4, the first L1 and second L2 levers are adapted to be rotated by a pressure exerted by the foot of a person or on a first lever portion which includes the first end, or a second lever portion which includes the second end. But, in a variant, at least one of the first L1 and second L2 levers could be fixedly secured to a clean control bar to drive it in rotation and manually operable. In this case, the control bar is fixedly secured to a lever Li, and either this control bar is rotatably mounted on the bar Bi, or the lever Li is rotatably mounted on the bar Bi. In the nonlimiting example illustrated in FIGS. 1 to 4, each inner door P1 comprises a lower part which is rotatably coupled to a plate PL (such as for example a rigid disk) which is provided with a hole TR intended to allow the passage of a portion of the inner shaft Tli of a lever Li. Similarly, each outer door PEi comprises a lower portion which is rotatably coupled to a plate PL (such as a rigid disk) which is provided with a hole TR intended to allow the passage of a portion of the outer rod TEi of a lever Li.

In order to facilitate the movement from top to bottom of the internal rods Tli and external TEi, it is possible to provide, as illustrated without limitation, guiding means secured to the adjacent and corresponding R-rail portions R. For example, these guide means may consist of bars whose free end is provided with a through hole inside which can slide a rod Tli or TEi. It will be understood that when the first part of a lever Li (which includes the first end) is rotated downwards, the inner shaft Tli is then moved up and down, and thus its lower part enters the hole TR of the PL disk of the inner door corresponding fold, which locks the rotation of the latter (fold), while the outer rod TEi which is secured to the second part of the same lever Li is moved from bottom to top, and therefore its lower part is extracted from the hole TR of the disk PL of the corresponding outer door PEi, which unlocks the rotation of the latter (PEi). Conversely, when the second part of a lever Li (which includes the second end) is rotated downwards, the outer rod TEi is then moved up and down, and thus its lower part enters the hole TR of the disk PL of the corresponding outer door PEi, which locks the rotation of the latter (PEi), while the inner rod Tli which is secured to the first part of the same lever Li is moved upwards, and therefore its The lower part is extracted from the hole TR of the disk PL of the inner door P1 corresponding, which unlocks the rotation of the latter (P11).

It will also be noted, as shown non-limitatively in FIGS. 1 to 4, that the control means (Li, Tli, TEi, MPj, Bi) may optionally comprise, in addition, first MP1 and second MP2 coupling means intended to constrain the levers Li to be simultaneously placed in the same position.

More specifically, the first coupling means MP1 is arranged either to allow the rotational drive of the first inner door P11 when the second outer door PE2 is immobilized in a position which partially obstructs the outer opening OE, or to allow the rotational drive of the second outer door PE2 when the first inner door P11 is immobilized in a position which partially obstructs the inner opening 01. The second coupling means MP2 is arranged either to allow the rotational drive of the second inner door P12 when the first outer door PE1 is immobilized in a position which partially obstructs the outer opening OE, or to allow the rotational drive of the first outer door PE1 when the second inner door P12 is immobilized in a position which partially obstructs the opening 01. To do this, the first coupling means MP1 can for example couple the first part of the second lever L2 to the second part of the first lever L1, and the second coupling means MP2 can for example couple the second part of the second lever L2 to the first part of the first lever L1 . For example, the first MP1 and second MP2 coupling means may each be in the form of a cable which slides in a sheath and whose ends are secured (as shown) to two different parts of the two levers Li. It will be understood that when the first end of such a cable is returned to its sheath following the upward and downward rotation of the lever portion to which it is secured, the second end of this same cable is rejected. out of its sheath which causes in rotation from bottom to top the lever part to which it is secured. It should be noted that instead of using sheaths, pulleys can be used. Of course other types of coupling means may be envisaged, including rods. Thanks to this coupling of position of the two levers Li, it is certain that the rotation of the two inner doors P1 is simultaneously unlocked while the rotation of the two external doors PEi is simultaneously locked, that the rotation of the two external doors PEi is simultaneously unlocked while the rotation of the two inner doors Fold is simultaneously locked. This ensures permanent safety for those who work in the ZC loading zone. Note that to further secure access to the outer opening OE, there may be provided a locking means for temporarily securing to one another the two outer doors PEi or the two inner doors P1. Such a locking means may, for example, be a padlock which is passed a ring in two holes defined in two tabs respectively secured to the two doors concerned.

If it is desired to lower a load of the stage S to a lower level, it is possible to proceed as indicated below. The situation illustrated in Figure 1 starts from (rotation of the PEi external doors locked and rotation of the inner doors fold unlocked). The load is deposited in the loading zone ZC and is attached to the hoisting system, then the two inner doors P1 of the outside of the loading zone ZC are closed (see FIGS. 2 and 3). Then, the first L1 or the second L2 lever is tilted inward while standing outside the loading zone ZC, which locks the rotation of the two inner Ply doors and unlocks the rotation of the two outer doors PEi . Then, outside the loading zone ZC, the two external doors PEi are opened to allow the lifting system to extract the load from the loading zone ZC in order to lower it to the lower level (see FIG. 4). . Then, external doors PEi are closed from outside the charging zone ZC, and the first L1 or second L2 lever is tilted outwards, which locks the rotation of the two external doors PEi and unlocks the rotation. two interior folds (see figures 2 and 3). Finally, the inner fold doors can be opened to free up space on the (floor) surface S (see Figure 1). If you want to mount a load of a lower level to the floor S, we can proceed as indicated below. The situation illustrated in Figure 1 starts from (rotation of the PEi external doors locked and rotation of the inner doors fold unlocked).

Then, close the inside doors Fold (see figure 2 and 3 - rotation of the PEi external doors locked and rotation of the inner doors Fold unlocked). Then, the first L1 or the second L2 lever is tilted while standing outside the loading zone ZC, which locks the rotation of the two inner Ply doors and unlocks the rotation of the two outer doors PEi. Then, outside the loading area ZC, the two external doors PEi are opened from outside the loading zone ZC in order to allow the lifting system to place in the loading area ZC the load which it has mounted at the level of the stage S. Then, external doors PEi are closed from outside the loading area ZC, and the first L1 or the second L2 lever is tilted outwardly while standing outside the loading zone ZC. which locks the rotation of the two outer doors PEi and unlocks the rotation of the two inner doors Fold. Then, from the outside of the loading zone ZC, the two inside doors P1 are opened, in order to separate the load from the lifting system, and the load is removed from the loading zone ZC.

The invention is not limited to the control device embodiments described above, only by way of example, but encompasses all the variants that can be envisaged by those skilled in the art within the scope of the claims herein. after.

Claims (12)

REVENDICATIONS1. Device (D) for controlling access to a loading zone (ZC) defined on a surface (S) having an edge (B) at the vacuum interface and protected by a guardrail (R) interrupted at the a so-called outer opening (OE) located on an outside said side of said loading zone (ZC), characterized in that it comprises i) at least one so-called outer door (PEi) adapted to be rotatably mounted on said surface (S) at said outer opening (OE) to at least partially control access thereto (OE), ii) at least one said inner door (P11) adapted to be rotatably mounted on said surface ( S) at a so-called inner opening (OI), located on an inner side said loading zone (ZC) placed opposite said outer side, to control at least partially access to this inner opening (OI) ), and iii) control means (Li, Tli, TEi, MPj, Bi) propr to be placed in a first position, in which they allow the rotation of said inner door (P11) and immobilize said outer door (PEi) in a position at least partially obstructing said outer opening (OE), or in a second position, in which they immobilize said inner door (P1) in a position at least partially obstructing said inner opening (OI) and allow the rotational drive of said outer door (PEi). 2. Device according to claim 1, characterized in that it comprises two outer doors (PEi) adapted to be rotated in opposite directions under the control of said control means (MC). 3. Device according to one of claims 1 and 2, characterized in that it comprises two inner doors (P1) adapted to be rotated in opposite directions under the control of said control means (MC). 4. Device according to the combination of claims 2 and 3, characterized in that said control means (Li, Tli, TEi, MPj, Bi) comprise i) a first lever (L1) having an intermediate partemounted to rotate on a first bar (B1) adapted to be fixed to said surface (S) and comprising first and second opposite ends secured respectively to inner (T11) and outer (TE1) rods adapted to allow or prohibit the rotation respectively of said first interior doors (P11) and outside (PE1), and ii) a second lever (L2) having an intermediate portion rotatably mounted on a second bar (B2) adapted to be fixed to said surface (S) and comprising first and second opposite ends respectively secured to inner rods (T12) and outer rods (TE2) adapted to allow or prohibit the rotation respectively of said second gates int higher (P12) and outer (PE2). 5. Device according to claim 4, characterized in that each inner door (P1) comprises a lower portion rotatably coupled to a plate (PL) provided with a hole (TR) adapted to allow the passage of a portion of an inner rod (Tli), and each outer door (PEi) comprises a lower portion rotatably coupled to a plate (PL) provided with a hole (TR) adapted to allow the passage of a portion of an outer rod ( TEi). 6. Device according to one of claims 4 and 5 or the combination of claims 2 and 3, characterized in that said control means (Li, Tli, TEi, MPj, Bi) comprise i) a first coupling means (MP1 ) arranged to allow rotation of a first inner door (P11) when a second outer door (PE2) is immobilized in a position partially obstructing said outer opening (OE), or to allow rotational driving of said second outer door (PE2) when said first inner door (P11) is immobilized in a position partially obstructing said inner opening (01), and ii) second coupling means (MP2) arranged either to allow rotational driving a second inner door (P12) when a first outer door (PE1) is immobilized in a position partially obstructing said outer opening (OE), or to authorize the driving e n rotation of said first outer door (PE1) when said second inner door (P12) is immobilized in a position partially obstructing said inner opening (OI). 7. Device according to one of claims 4 and 5 in combination with claim 6, characterized in that said first coupling means (MP1) is coupled, on the one hand, to a first portion of said second lever (L2), having the first end thereof (L2), and secondly to a second portion of said first lever (L1), having the second end thereof (L1), and said second coupling means (MP2) is coupled, on the one hand, to a second portion of said second lever (L2), having the second end thereof (L2), and, on the other hand, to a first portion of said first lever (L1), comprising the first end of the latter (L1). 8. Device according to one of claims 6 and 7, characterized in that said first (MP1) and second (MP2) coupling means are each arranged in the form of a cable sliding in a sheath. 9. Device according to one of claims 4 to 8, characterized in that said first (L1) and second (L2) levers are adapted to be rotated by pressing a foot of a person. 10. Device according to one of claims 4 to 8, characterized in that at least one of said first (L1) and second (L2) levers is securely fixed to a control bar own to rotate it. 11. Device according to one of claims 1 to 10, characterized in that each inner door (Ply) has an L shape. 12. Device according to one of claims 1 to 11, characterized in that each outer door (PEi) is substantially flat.