Motorized adjustable slat shutter

Abstract

The invention relates to a motorization device (300) for the motorized opening and closing of the slats of a shutter with adjustable slats, comprising: an electric geared motor (301) configured to drive a motor shaft (201) in rotation; a drive rod (211), rotationally linked to the motor shaft (201); a receiving shaft (202), parallel to the motor shaft (201) and rotationally linked to an adjustable slat (120); a receiving rod (212) rotationally linked to the receiving shaft (202); a transmission rod (200) linked by a first pivot joint (231) to the drive rod (211) and by a second pivot joint (232) to the receiving rod (212), arranged in a deformable parallelogram between the motor shaft (201) and the receiving shaft (202); a configuration of the deformable parallelogram being limited by a stop (225) corresponding to the open position of the orientable blades;and an electronic control of the electric geared motor including a limitation of a motor torque.

Description

Title of the invention: Motorized adjustable slat shutter technical field

[0001] The invention belongs to the field of openings and windows, more particularly the invention relates to the field of hinged or sliding shutters comprising slats arranged in louvers. Previous technique

[0002] Adjustable slat shutters include slats, most commonly made of wood, plastic or aluminum alloy, arranged in the form of louvers, and which, when the shutters are closed and obstruct an opening, nevertheless allow, by rotation of the slats around their major axis, to open their surface for lighting or ventilation purposes, while continuing to obstruct the opening from any access.

[0003] According to a prior embodiment, [Fig.1], this type of shutter (100) comprises, for one leaf, an outer frame (110), parallel adjustable slats (120), connected to two parallel uprights (111, 112) of the frame, by a pivot joint about their major axis (121), so that the slats can pivot about this axis between a closed position, where a first longitudinal edge (122), parallel to the major axis, of a first slat is joined or overlapped with a second longitudinal edge (123) of a second slat adjacent to the first slat, and an open position where the first and second longitudinal edges are separated, the open position, shown [Fig.1] corresponding to the slats being perpendicular to the uprights (111, 112) and to a pivot of 90° or less about the major axis, relative to the closed position.

[0004] All the slats pivot at the same time by a substantially equal angle. To this end, the slats are connected to each other, on the side of the inner face of the shutter, on their short edge (124) by a linkage system comprising at least one rod (130) extending parallel to the upright and in pivot connection with all the slats along an axis parallel to the major axis, so that a translation of the rod (130) substantially perpendicular to this pivot connection axis and parallel to the uprights produces a rotation of all the slats.

[0005] During such a movement, if the rod remains parallel to the upright, taking into account the kinematics, any point of the rod follows a circular arc trajectory, the rod moving away from the upright, while remaining parallel to it, when the device passes from the closed position to the open position and vice versa.

[0006] A manual control (140) allows this movement to be performed by the rod via a lever pivoting at one of its ends around an axis located in an upright and connected to the rod by means of a pivot joint distant from the end pivot joint, the pivoting lever between two stops of extreme positions corresponding to the closed position and the open position of the blades, materialized for example by the limits of a slot made in the upright.

[0007] However simple the manually operated device may be, its motorization poses difficulties.

[0008] According to examples of embodiments, the motorization is achieved by moving the manual control lever or an equivalent lever acting on the linkage.

[0009] Such a motorization device, installed for example on the surface of a post, is bulky and unsightly.

[0010] Another solution consists of motorizing the rotation of one of the blades, which then transmits the movement to the others via the linkage. Document KR20050021671A describes an example of implementing such a solution.

[0011] This device requires special parts and the presence of limit switches corresponding to the extreme positions of the blades (open / closed) so that the device completely closes the blades in the closed position without leaving any gap but without causing "forcing" on the blades, particularly when they are mounted in a clinker configuration.

[0012] However, while the open position always corresponds to the slats being perpendicular to the frame, the orientation of the slats in the closed position depends on the design of the shutters. It may be located at 90° to the open position or less than 90°, particularly if the slats are mounted in a staggered pattern, so that at least the limit switch corresponding to the closed position must be adjusted and set relative to the housing according to the shutter on which the device is mounted, which is tedious, not to mention that this adjustment is likely to change over time.

[0013] The motorized opening and closing of the slats allows them to be controlled remotely. Therefore, if an obstacle is introduced between the slats, their closure may cause damage, even though the person operating the opening mechanism may not be nearby to notice the problem.

[0014] The same applies if such a device is, for example, installed on hinged shutters. With a manual control, it is generally not possible to control the opening of the slats if the shutters are open and folded against a wall: the control is too far away and in any case the person notices the configuration.

[0015] With a motorized control, it might be possible to remotely trigger an opening, while the open hinged shutters are pressed against the wall, which would cause degradation of the slats. Summary of the invention

[0016] The proposed device aims to resolve these drawbacks and, to this end, relates to a motorized device for the motorized opening and closing of the slats of a shutter with adjustable louvers comprising a plurality of adjustable slats, arranged in a louvered configuration, each adjustable slat being pivotable around a major axis, between an open position and a closed position, the adjustable slats of the plurality being linked in rotation, comprising:

[0017] a low voltage electric geared motor configured to drive a rotating motor shaft;

[0018] a drive link, rotationally connected to the drive shaft by a first drive end;

[0019] a receiving axis, parallel to the driving axis and linked in rotation to a blade that can be oriented around its major axis;

[0020] a receiving link connected in rotation to the receiving axis by a first receiving end;

[0021] a transmission connecting rod linked by a first pivot joint to a second drive end of the drive connecting rod and by a second pivot joint to a second receiving end of the receiving connecting rod, the drive connecting rod, the receiving connecting rod and the transmission connecting rod being arranged in a deformable parallelogram between the driving axis and the receiving axis;

[0022] a configuration of the deformable parallelogram being limited by a stop corresponding to the open position of the adjustable blades; and

[0023] an electronic control of the electric geared motor comprising a limitation of a motor torque.

[0024] Thus, this device does not require a limit switch. The limitation of the motor torque is sufficient to detect an open position of the steerable blades, the transmission rod reaching its stop in this position, as well as a closed position of the steerable blades, the latter coming into contact with each other.

[0025] The device is implemented according to the embodiments and variants set out below, which are to be considered individually or according to any technically operative combination.

[0026] Advantageously, the motor shaft is rotationally linked to the adjustable slat by a flange fixed to a small edge of the adjustable slat. This coupling method allows the device to be easily adapted to any shutter with adjustable slats.

[0027] Advantageously, the electronic control includes an electronic control board and a remote control electronically connected to the electronic control board by a link chosen from a wired link and a wireless link.

[0028] Advantageously, the device includes an angular position sensor for one of the axes, either the driving axis or the driven axis, and the electronic control includes a learning mode to determine from the angular sensor an angular displacement between the open and closed position of the adjustable blades.

[0029] According to one embodiment, the device comprises a battery adapted to power the electric geared motor and a solar panel adapted to recharge the battery. Thus, the device can operate autonomously and does not require connection to a power source.

[0030] According to this embodiment, the device advantageously comprises a sensor configured to measure the intensity of an electric current delivered by the solar panel, and in which the electrical control of the geared motor is configured to control the rotation angle of the motor shaft as a function of the intensity of the electric current delivered by the solar panel. Thus, the orientation of the blades can be automatically controlled according to the amount of sunlight.

[0031] The device is more particularly suited to a shutter comprising a frame and a plurality of adjustable slats extending along a major axis between two uprights of the frame and in which the device is integrated into one of the two uprights.

[0032] According to one embodiment, the shutter comprises a hinged leaf configured to close an opening in a wall in a closed position and to uncover the opening in an open position where the hinged leaf is against the wall, comprising an electronic compass fixed to the leaf and configured to deliver an orientation signal according to an orientation of the leaf relative to the wall, and in which the electronic control of the electric geared motor prohibits any movement of the motor shaft when the orientation signal corresponds to the open position.

[0033] The device can also be adapted as a shutter comprising a first leaf equipped with the motorized device and a second leaf comprising a frame and a plurality of adjustable slats extending along a major axis between two uprights of the frame, comprising a coupling device, capable of linking an orientation of the slats of the second leaf to an orientation of the slats of the first leaf when both leaves are in the blackout position.

[0034] According to one embodiment, the two leaves are hinged, the second leaf comprising a cremone bolt for locking it in the concealed position, the cremone bolt comprising a locked configuration and an unlocked configuration, and in which the coupling device is clamped when the cremone bolt is in the unlocked configuration so as to prevent the rotation of the adjustable blades of the second leaf. Brief description of the drawings

[0035] The device is implemented according to the preferred but in no way limiting embodiments set out below with reference to [Fig. 1] to [Fig. 6] in which: Fig. 1

[0036] [Fig.l] relating to the prior art represents, according to a perspective view, a shutter leaf comprising adjustable slats arranged in louvers; Fig. 2

[0037] [Fig.2] is a kinematic diagram representing an example of a connecting rod arrangement for the implementation of the device, 2A for an open configuration of the adjustable blades, 2B for a closed configuration of the adjustable blades; Fig.3

[0038] [Fig.3] shows, in a perspective and exploded view, an example of a casing including the device for its integration into a component; Fig. 4

[0039] [Fig.4] is a perspective and exploded view of a shutter leaf equipped with the device, in closed configuration of adjustable blades seen from the side of its inner face; Fig. 5

[0040] [Fig.5] is a front view of the leaf shown [Fig.4] external face side; Fig. 6

[0041] [Fig.6] shows a front view of the inner side of a shutter comprising two leaves coupled by a coupling device, the second leaf being partially visible. Description of the implementation methods

[0042] The device is adaptable to a shutter leaf as shown [Fig.1] for example at the location of the manual control or any other location on one of the uprights (111, 112) perpendicular to the adjustable slats, on the side of the inner face of the shutter, even if, for example for original equipment, the shutter does not have a manual control or if, in renovation, the manual control is retained in addition to the motorization.

[0043] The shutter can be hinged, sliding or fixed.

[0044] The device is, for example, mounted in a surface-mounted housing on one of the uprights (111, 112) and coupled to one of the adjustable slats as shown later. The opening and closing movements are then transmitted to this adjustable slat and reproduced by the other adjustable slats due to the connection via the rod (130).

[0045] According to a schematic embodiment [Fig.2] the device comprises a motor axis (201) and a receiver axis (202) whose axes of rotation are fixed relative to the volt to be motorized.

[0046] The drive shaft (201) rotates a drive rod (211) by one end of the latter, and by its second end the drive rod (211) is connected to one end of a transmission connecting rod (220) by a pivot joint (231). The other end of the transmission connecting rod (220) is connected by a pivot joint (232) to a second end of a receiving connecting rod (212) which is rotationally connected to the receiving shaft (202).

[0047] The assembly is arranged as a deformable parallelogram of which two of the pivot axes, in this case that of the driving axis (201) and that of the receiving axis (202), are fixed in space.

[0048] [In an extreme 2A configuration the deformation of the parallelogram is limited by the transmission rod (220) coming to meet a stop (225).

[0049] From this extreme position a rotation of an angle (270) of 90° or more of the driving shaft (201) is transmitted from the drive link (201) to the transmission link (220), which leaves the contact of the stop, to the receiving link (212) and to the receiving shaft (202), to arrive at the configuration 2B.

[0050] A person skilled in the art understands that the arrangement of the connecting rods and axes of [Fig.2] can be reversed without changing the operating principle of the mechanism, the driving axis then becoming the receiving axis.

[0051] [Fig.3] According to one embodiment, the device includes a housing (390) for its attachment and integration into the leaf of a shutter, the housing including an electric geared motor (301) with low voltage typically from 6V to 24V according to implementation examples, powered by a battery (350) delivering an appropriate voltage.

[0052] The device includes an electronic control board (360) capable of controlling the electric geared motor. Advantageously, the electronic control board includes a receiver for a wireless control link via ZigBee®, RTS®, Bluetooth® or Wifi®, without these examples being limiting, allowing control of one or more devices of this type via a remote control or a home automation application, particularly on a smartphone.

[0053] Alternatively, or in addition to the wireless connection, a wired control can be installed.

[0054] The electronic control board (360) allows the start and stop of the electric geared motor (301) powered electrically by the battery (350), as well as its direction of rotation to open or close the adjustable slats of a shutter equipped with this device, according to an order received from the remote control.

[0055] To this end, the receiving shaft (202) of the device is coupled to an adjustable slat of a shutter via a flange (310). This flange is configured to be fixed on a small edge of an adjustable slat near the stile of a shutter.

[0056] Since all the adjustable slats of such a shutter are linked in rotation by a rod system, the connection of a single slat to the device allows the entire set of adjustable slats to be controlled.

[0057] Different flange shapes, dimensions, and mounting arrangements allow the device to be adapted to any type of shutter, any size of adjustable slats, and any material used for these adjustable slats, such as PVC, wood, or aluminum alloy, whether the slats are hollow or solid. Therefore, the device does not require a direct connection between the receiving shaft and the hinge shaft of the adjustable slat in the frame, making it suitable for both new installations and retrofits on any type of shutter with adjustable slats.

[0058] [Fig.3] represents the device in a configuration where the adjustable blades of the The flaps are open and the transmission rod (220) is against the stop. According to this embodiment, the stop is formed by the outer face of a bearing (302) of the receiving shaft (202).

[0059] Starting from the configuration of [Fig.3], a user can, for example, control the closing of the adjustable slats of the shutter by an action on the remote control. Following this action, the electronic control board commands the electric geared motor to rotate the motor shaft (201) in the appropriate direction, which is transmitted by the transmission rod (220) and the connecting rods (211, 212) to the receiver shaft (202). The transmission rod (220) leaves contact with the stop, and the rotation of the receiver shaft (202) is transmitted to the adjustable slat via the flange (310). The adjustable slat then progresses towards the closed position and drives the other adjustable slats of the shutter by means of the rod.

[0060] This rotation (370) can be interrupted by the user at any time, in which case it stops leaving the orientable blade in an intermediate position between the open configuration and the closed configuration.

[0061] If the action is continued, the steerable blades rotate until they come into the closed position where the large edges of the steerable blades come into contact with each other.

[0062] This contact between the edges of the adjustable blades, which constitutes a stop, results in an increase in the driving torque delivered by the electric geared motor, an increase in torque which can be detected, for example, by measuring the intensity of the supply current of the electric geared motor.

[0063] Thus, the electronic control board includes a sensor capable of detecting such an increase in the motor supply intensity, for example by exceeding a predefined threshold, and in response stops the motor's rotation.

[0064] Conversely, starting from the closed configuration of the adjustable blades, an action on the remote control in this direction causes the geared motor to rotate electric (301) in the opposite direction, controlled by the electronic control board, until the transmission rod (220) comes into contact with the bearing (302) of the receiving shaft, this contact causes an increase in motor torque, the electrical supply current of the latter increasing, the threshold detection leads to stopping the electric geared motor, in a position which corresponds to the full opening of the orientable blades.

[0065] Thus the device does not require a limit switch sensor for either the opening or the closing of the adjustable blades.

[0066] In addition, the control of stopping the electric geared motor when its delivered torque reaches a defined threshold, makes it possible to improve the safety of the device in particular if an obstacle is lodged between the orientable blades and hinders their operation, thus preventing damage to the orientable blades and injuries.

[0067] The torque / current limit leading to motor shutdown can be adjusted.

[0068] According to one embodiment, the electric geared motor may comprise a measurement of its angular position, for example by means of an angular encoder linked to the motor shaft of the electric geared motor or linked to the motor shaft (201) of the electric geared motor or to the receiver shaft.

[0069] In the presence of such an angular sensor, the translation of the extreme angular positions of the steerable blades can be measured during an initial learning procedure comprising a maneuver between the two extreme positions, the device being stopped in these two positions by the limitation of the torque.

[0070] Once these angular values ​​are known, and consequently adapted to any shutter without any operation other than carrying out a back-and-forth maneuver, with these values ​​known, the stroke can be split into several intermediate and reproducible positions of the orientation of the blades.

[0071] [Fig.4] The device (300) is integrated into the surface-mounted adjustable slat shutter on a amount (111) on the side of the inner face of said flap.

[0072] [Fig.5] a solar panel (500) is installed on the external face of a leaf (101). This solar panel is designed to deliver a voltage sufficient to recharge the device's battery, which is sized to allow the adjustable blades to operate at an average daily frequency for several days without needing to be recharged, for example, 30 days.

[0073] Thus, the device is autonomous and does not require an electrical connection to the mains.

[0074] Advantageously, the electronic control board includes a measurement of the current intensity delivered by the solar panel. Within the solar panel's operating range, this intensity is proportional to the light power to which the solar panel is exposed.

[0075] This information can be advantageously used, in an embodiment, to control the orientation of the adjustable slats according to the illumination of the shutter. Particularly if the device is equipped with an angular position measurement system, the adjustable slats can then be more or less closed depending on the intensity of the shutter's illumination, when the shutter is in the position of closing an opening to the outside.

[0076] According to one embodiment, the shutter is of the hinged type, the leaf being mounted on a facade in front of an opening, for example by hinges (510) allowing a movement by pivoting of the leaf around a leaf axis (501) so that in the concealed position as represented [Fig.5] the leaf obstructs part of the opening, and an open position in which the leaf, by a rotation of 180° around the leaf axis (501), is brought against the facade uncovering the opening.

[0077] In this open position of the leaf, the adjustable blades must be in the closed position to avoid damaging them, in particular by impact of the large edges of the adjustable blades against the facade.

[0078] To avoid this risk, the leaf is advantageously equipped with an electronic compass (520) capable of delivering to the electronic control board information proportional to the orientation of the leaf relative to magnetic north.

[0079] Once the leaf (101) is installed on the facade, during a calibration procedure, its orientation relative to magnetic north is measured by the electronic compass and this orientation value is recorded in a memory of the electronic control board.

[0080] If the orientation of the leaf deviates from this memorized orientation beyond a certain tolerance, advantageously adjustable and measured by the electronic compass, then the electronic control board commands the rotation of the electric geared motor in the direction of closing the adjustable slats until the motor torque limit is reached. The adjustable slats are then in the closed position, regardless of their initial orientation. Thus, the adjustable slats are systematically in the closed position when the leaf (101) is brought to the open position.

[0081] [Fig.6] according to an example embodiment the shutter comprises two leaves (101, 601) for example two hinged shutters, but the device is also adaptable to two sliding leaves.

[0082] In the case of two hinged leaves, one of the two (600) includes a cremone bolt for locking the leaves in the closed position. The cremone bolt, shown [Fig. 6] in the locked position, comprises a first locking bar (611) and a second locking bar (612) moving in translation parallel to a leaf upright under the action of a manual cremone control (620).

[0083] A coupling device allows the two leaves (101, 601) to be coupled so that the opening and closing of the adjustable blades of the first leaf by the motorization device (300) can also control the adjustable blades of the second leaf (600).

[0084] According to one embodiment, the purely mechanical coupling device comprises two coupling plates (631, 632). A first coupling plate (631) is linked in translation to a rod (130, [Fig. 4]) connecting the small edges of the adjustable slats of the first leaf (101), and a second coupling plate (632) is linked to a rod connecting in translation to the small edges of the adjustable slats of the second leaf (601). The two plates (632, 632) have, for example, a crenellated profile, which interlocks with one another when the two leaves are in the closed position as [Fig. 6].

[0085] Thus a movement of the rod of the first leaf (101) under the effect of the motorization device (300) during an opening or closing command of the adjustable blades of the first leaf (101) is transmitted by the first coupling plate (631) to the second coupling plate (632) which acting on the rod of the second leaf produces a synchronized movement of the adjustable blades of the second leaf (600).

[0086] When the leaves are in the open position separated from each other, the coupling device is no longer operational.

[0087] A safety device prevents the movement of the adjustable blades of the two leaves if the cremone bolt is not in the locked position.

[0088] To this end, the second locking bar (612) of the cremone, for example, includes a projecting stop (640), suitable for cooperating with a groove (641) made in the second coupling plate (632).

[0089] [Fig.6] the cremone is in the locked position and the stop (640) is outside the groove (641).

[0090] When the cremone bolt is moved to the unlocked position, the second locking bar (612), as shown in this example, moves towards the cremone bolt control (620), driving the stop (640) into the groove of the locking plate. If, in this unlocked configuration of the cremone bolt, the motor (300) is activated to open the adjustable slats, then the movement of the coupling plates (632, 632) is prevented by the presence of the stop (640) in the groove (641). The drive torque delivered by the electric geared motor increases due to this blockage, and the electronic control of the motor stops the movement.

[0091] Thus, the motorized control of opening the adjustable blades is only possible if the cremone bolt is locked. List of reference signs

[0092] 101 leaf

[0093] 110 outer frame

[0094] 111,112: uprights

[0095] 120 adjustable blade

[0096] 121 major axis

[0097] 122 longitudinal edge

[0098] 123 second edge

[0099] 124 minor edge

[0100] 130 rod

[0101] 140 manual control

[0102] 201 motor shaft

[0103] 202 driven shaft

[0104] 211 drive link

[0105] 212 driven link

[0106] 220 transmission link

[0107] 231 pivot joint

[0108] 232 second pivot joint

[0109] 300 motorization device

[0110] 301 electric geared motor [YES] 302 bearing (of the receiving shaft)

[0112] 310 flange

[0113] 350 battery

[0114] 360 electronic control board

[0115] 370 rotation (of the motor shaft)

[0116] 390 housing

[0117] 500 solar panel

[0118] 501 swing axle

[0119] 510 hinges

[0120] 520 electronic compass

[0121] 601 second leaf

[0122] 611 first locking bar

[0123] 612 second locking bar

[0124] 620 cremone bolt

[0125] 631 coupling plate

[0126]

[0127]

[0128] 632: second coupling plate 640: stop 641: groove

Claims

Demands

1. A motorization device (300) for the motorized opening and closing of the slats of a shutter with adjustable louvers comprising a plurality of adjustable louvers (120), arranged in a louvered configuration, each adjustable louver being pivotable about a major axis (121), between an open position and a closed position, the adjustable louvers of the plurality being rotationally linked, comprising: a low-voltage electric geared motor (301), configured to drive a motor shaft (201) in rotation; a drive link (211), rotationally linked to the motor shaft (201) by a first drive end; a receiving shaft (202), parallel to the motor shaft (201) and rotationally linked to an adjustable louver (120) about its major axis (121); a receiving link (212) rotationally linked to the receiving shaft (202) by a first receiving end;a transmission connecting rod (200) linked by a first pivot joint (231) to a second drive end of the drive connecting rod (211) and by a second pivot joint (232) to a second receiving end of the receiving connecting rod (212), the drive connecting rod (211), the receiving connecting rod (212) and the transmission connecting rod (220) being arranged in a deformable parallelogram between the drive shaft (201) and the receiving shaft (202); a configuration of the deformable parallelogram being limited by a stop (225) and corresponding to the open position of the steerable blades; and an electronic control of the electric geared motor comprising a limitation of a motor torque.

2. Device according to claim 1, wherein the receiving shaft (202) is rotationally linked to the steerable blade by a flange (310) fixed on a small edge (124) of the steerable blade.

3. Device according to claim 1, wherein the electronic control comprises an electronic control board (360) and a remote control electronically connected to the electronic control board by a link selected from a wired link and a wireless link.

4. Device according to claim 1, comprising an angular position sensor of one of the axes between the motor axis (201) and the axis receiver (202) and in which the electronic control includes a learning mode to determine from the angular sensor an angular displacement between the open position and the closed position of the steerable blades.

5. Device according to claim 1, comprising a battery (350) adapted to provide power to the electric geared motor (301) and a solar panel (500) configured to recharge the battery.

6. Device according to claim 5, comprising a sensor configured to measure the intensity of an electric current delivered by the solar panel (500) and in which the electronic control of the electric geared motor (301) is configured to drive an angle of rotation of the motor shaft as a function of the intensity of the electric current delivered by the solar panel (500).

7. Shutter (100) comprising a frame and a plurality of adjustable blades extending along a major axis (121) between two uprights (111, 112) of the frame and comprising a device (300) according to claim 1, integrated into one of the two uprights.

8. Shutter (100) according to claim 7, comprising a hinged leaf (101) configured to close an opening in a wall in a closed position and to uncover the opening in an open position where the leaf (101) is against the wall, comprising an electronic compass (520) fixed to the leaf (101) and configured to deliver an orientation signal as a function of an orientation of the leaf relative to the wall, and wherein the electronic control of the electric geared motor prevents any movement of the motor shaft (201) when the orientation signal corresponds to the open position.

9. Shutter comprising a first leaf (101) according to claim 7 and a second leaf (601) comprising a frame and a plurality of adjustable slats extending along a major axis between two uprights of the frame, comprising a coupling device (631, 632), capable of linking an orientation of the slats of the second leaf (601) to an orientation of the slats of the first leaf (101) when both leaves are in the closed position.

10. A shutter according to claim 9, wherein both leaves are hinged, the second leaf (601) comprising a cremone bolt for locking it in the closed position, the cremone bolt comprising a locked configuration and an unlocked configuration, and in which the coupling device (631, 632) is restricted when the cremone is in the unlocked configuration so as to prevent the rotation of the orientable blades of the two leaves.

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