UNIVERSAL OPERATING DEVICE FOR A SCREEN, SUCH AS A WINDOW COVERING

Description

[0001] The invention relates to an operating device for a screen, such as a window covering, which screen is provided with a screen shaft and a drive element for the screen shaft, comprising:
a first operating mechanism comprising a first operating element which is connected to a first movement transfer element connected by means of a first transmission to the drive element, wherein the first operating mechanism is configured to convert a linear movement of the first operating element to a first rotational movement of the drive element for operating the screen shaft in a first rotational direction (clockwise or counterclockwise).

[0002] An example of such a known operating device is a chain operation with a chain loop or a cord loop with which the screen shaft can be rotated in two opposite directions in order to move a screen cover attached to the screen shaft upward or downward.

[0003] The present invention has for its object to improve the known operating device.

[0004] According to the invention the operating device further comprises:
a second operating mechanism comprising a second operating element which is connected to a second movement transfer element connected by means of a second transmission to the drive element, wherein the second operating mechanism is configured to convert a linear movement of the second operating element to a second rotational movement of the drive element for operating the screen shaft in a second rotational direction opposite to the first rotational direction (counterclockwise or clockwise).

[0005] The operating device according to the invention has various advantages. Firstly, the two operating elements can be embodied independently of each other. They no longer form part of a loop, whereby the operating device according to the invention is completely child-proof. The operation thereof is further highly intuitive for the user since a separate operating element is provided for upward and downward movement of the screen. The operating device according to the invention is moreover universally applicable as replacement for chain operation in diverse types of window covering. In the device according to the invention the first operating mechanism comprises a first pull cord and the first movement transfer element comprises a first cord reel for winding up the first pull cord, and the second operating mechanism comprises a second pull cord and the second movement transfer element comprises a second cord reel for winding up the second pull cord.

[0006] Cord reels provide the option of controlled operation in one direction.

[0007] The first transmission is provided with a first unidirectional coupling and a first toothed wheel on the drive element for co-action with the first unidirectional coupling in an operational position, wherein the first transmission is further provided with a first activator for activating the operational position of the unidirectional coupling, wherein the first movement transfer element is connected to the first activator, and the second transmission is provided with a second unidirectional coupling and a second toothed wheel on the drive element for co-action with the second unidirectional coupling in an operational position, wherein the second transmission is further provided with a second activator for activating the operational position of the second unidirectional coupling, wherein the second movement transfer element is connected to the second activator.

[0008] An operating device according to the preamble of claim 1 is known from US 5890529.

[0009] In the transmission according to US 5890529 the movement transfer element pushes the unidirectional coupling in axial direction over the central shaft in engagement with the toothed wheel on the drive element. This results in a vulnerable transmission which is susceptible to wear and not suitable for heavy load, for instance of large screens.

[0010] The invention provides an operating device with an improved first and second transmission, wherein the first unidirectional coupling is provided with a central first body with a first opening and a number of flexible first arms and wherein the second unidirectional coupling is provided with a central second body with a second opening and a number of flexible second arms. The first and second unidirectional couplings act in radial direction, this contributing toward a compact transmission.

[0011] The first activator is provided with a first flange with a number of first protrusions for bending the first arms outward in radial direction of the first unidirectional coupling and the second activator is provided with a second flange with a number of second protrusions for bending the second arms outward in radial direction of the second unidirectional coupling. The activator likewise acts in radial direction, this further contributing toward a compact transmission with a minimal number of components.

[0012] In a further elaboration each of the protrusions is provided with a securing element which extends in peripheral direction of the flange for the purpose of locking one of the flexible arms. The securing elements ensure deactivation of the unidirectional coupling when it is not active.

[0013] In a further preferred embodiment the operating device comprises a housing with a passage for the central shaft in which the first movement transfer element and the second movement transfer element and the spring are accommodated. The two operating mechanisms of the operating device according to the invention can advantageously be accommodated in compact manner in a shared housing.

[0014] According to a subsequent preferred embodiment, the drive element is provided on the inner side with the first and the second toothed wheel. This further contributes toward a compact embodiment of the operating device.

[0015] In a cost-efficient variant the first and the second toothed wheel are formed by one toothed wheel with straight toothing. This variant is simpler to produce.

[0016] In a practical preferred embodiment the first unidirectional coupling is arranged round a connecting bush for the drive element, which connecting bush is arranged on the central shaft.

[0017] In an elegant preferred embodiment the second unidirectional coupling is arranged round a collar around the passage of the housing.

[0018] In a compact preferred embodiment the first activator and the second activator are arranged coaxially round the pin in the passage of the housing.

[0019] The invention also relates to a screen, such as a window covering, provided with an operating device according to the invention.

[0020] The invention will now be described in more detail with reference to the figures.

Figure 1 is a schematic view of a roller blind with an operating device according to the invention;

Figure 2 shows the operating device of figure 1 in more detail;

Figure 3 shows the operating device of figure 2 with exploded parts;

Figure 4A shows a part of figure 2 in more detail;

Figure 4B is a cross-sectional view of a part of figure 2;

Figure 5A is a cross-sectional view of another part of figure 2 in a first position;

Figure 5B is a cross-sectional view of the other part of figure 5A in a second position; and

Figure 6 shows a variant of the drive element in the operating device of figures 2 and 3.

Figure 1 is a schematic view of a window covering 100 with an operating device 1 according to the invention. In the shown preferred embodiment the window covering is a roller blind system 100 provided with a flexible sheet-like object 101 such as a roller blind fabric or a screen covering which a user, using operating device 1, can wind up and unwind round a roller blind tube (not shown) with operating elements 7 and 8. The roller blind is further provided with two bracket holders or screen shaft holders 103 which are arranged on the outer ends of the roller blind system and are configured for releasable coupling to mounting brackets 102 for the purpose of mounting the roller blind system on a surface. Shaft holder 103 is provided with a connecting piece or pin 104 for connection to a screen shaft (not shown) of roller blind system 100. In roller blind system 100 the pin 104 and the screen shaft lie mutually in line along a central axis.

Figure 2 shows operating device 1 in more detail. Figure 3 shows operating device 1 with exploded parts.

[0021] Operating device 1 according to the invention comprises two operating mechanisms. Each operating mechanism has its own respective operating element 7, 8 which is connected to a respective movement transfer element 10, 20. Both movement transfer elements 10, 20 are received in a housing comprising two housing parts 2, 4. First housing part 2 has a central passage 3, second housing part 4 has a central passage 5, first movement transfer element 10 has a central passage 14 and second movement transfer element 20 has a central passage 24 for the purpose of connecting the screen shaft to pin 104 of screen shaft holder 103.

[0022] Each movement transfer element is connected by means of an associated transmission to a drive element 60. The first operating mechanism is configured to convert a linear movement of first operating element 7 to a rotational movement of drive element 60 in clockwise direction. The second operating mechanism is configured to convert a linear movement of second operating element 8 to a rotational movement of drive element 60 in counterclockwise direction.

[0023] The first transmission is provided with a first unidirectional coupling 31 and a first toothed wheel 33 on drive element 60 for co-action with first unidirectional coupling 31 in an operational position. The first transmission is further provided with a first activator 32 for activating the operational position of unidirectional coupling 31. First activator 32 is connected to first movement transfer element 10.

[0024] The second transmission 40 is provided with a second unidirectional coupling 41 and a second toothed wheel 43 on drive element 60 for co-action with second unidirectional coupling 41 in an operational position. The second transmission is further provided with a second activator 42 for activating the operational position of second unidirectional coupling 41. Second activator 42 is connected to second movement transfer element 20.

[0025] First activator 32 and second activator 42 are arranged coaxially round pin 104 in the passage of housing 2, 3.

[0026] First unidirectional coupling 31 has a central first body 310 with a first opening 311 and a number of flexible first arms 312.

[0027] Second unidirectional coupling 41 has a central second body 410 with a second opening 411 and a number of flexible second arms 412.

[0028] First activator 32 has a first flange 321 with a number of first protrusions 322 and a first passage 323 with a first neck 324. Neck 324 is provided with first projections for co-action with a discontinuous collar 15 around central passage 14 on first cord reel 10.

[0029] Second activator 42 has a second flange 421 with a number of second protrusions 422 and a second passage 423 with a second discontinuous collar 424 with second projections. The discontinuous collar is configured to be received in recesses 25 in passage 24 on second cord reel 20.

[0030] Operating device 1 comprises a connecting bush 50 for receiving in drive element 60, which connecting bush is arranged on pin 104. Arranged with braking effect round connecting bush 50 are a number of throttle springs 51. The number of throttle springs preferably lies between one and five, and is most preferably three.

[0031] First unidirectional coupling 31 is arranged clamping lightly round an outer end of connecting bush 50. Second housing part 4 is provided with an external collar 6 round central passage 5. Second unidirectional coupling 41 is arranged clamping lightly round collar 6. First toothed wheel 33 and second toothed wheel 43 are arranged adjacently on the inner side of drive element 60.

[0032] Drive element 60 is configured for co-action with an end plug 107 intended to be received in a roller blind tube of roller blind system 100.

[0033] Housing 2, 4 is rotatable and so is not dependent on the direction of installation.

[0034] The operating device according to the invention can be used for both left or right-hand operation for a window covering.

[0035] The operation of the operating mechanisms will be explained in more detail with reference to figures 4A, 4B, 5A and 5B.

[0036] In the shown preferred embodiment the first operating mechanism comprises a first pull cord 11 and the first movement transfer element is a first cord reel 10 for winding up the first pull cord 11.

[0037] In the shown preferred embodiment the second operating mechanism comprises a second pull cord 21 and the second movement transfer element is a second cord reel 10 for winding up the second pull cord 21.

[0038] First pull cord 11 and second pull cord 21 are mutually connected by a spring, preferably a recoil spring 12. This recoil spring 12 is shown in figures 4A and 4B.

[0039] Figure 4A shows a part of operating device 1 in more detail. Figure 4B is a cross-sectional view of housing 2, 4 of operating device 1. Cord reel 10 is configured to guide first pull cord 11 along the periphery. In the shown preferred embodiment the first cord reel 10 is provided with a first peripheral edge 18 with a first outer cord passage 13 for attaching the first pull cord 11. First cord reel 10 is also provided with a first collar 16 with a first inner channel 17. Recoil spring 12 is placed between first collar 16 and first peripheral edge 18. The outer ends of recoil spring 12 take a hook-like form and an outer end hooks into channel 17.

[0040] The other outer end of first pull cord 11 is connected to first operating element 7. Cord reel 10 is provided with a stop for first operating element 7 during winding up of first pull cord 11. In the shown preferred embodiment first operating element 7 is a bead chain and the narrowed cord passage on the underside of housing 4 functions as stop for the beads of bead chain 7.

[0041] The outer end of first pull cord 11 is connected to an outer end of recoil spring 12. In the shown preferred embodiment this connection is indirect, i.e. via cord reel 10.

[0042] Cord reel 20 is configured to guide second pull cord 21 along the periphery. In the shown preferred embodiment second cord reel 20 is provided with a second peripheral edge 28. Second cord reel 20 is also provided with a second collar 26 with a second recess 27. The other hook-like end of recoil spring 21 hooks into recess 27. Also situated in the second collar is a second outer cord passage 23 for passage of second pull cord 21.

[0043] The other end of pull cord 21 is connected to the second operating element. Cord reel 20 is provided with a stop for second operating element 8 during winding up of second pull cord 21. In the shown preferred embodiment second operating element 8 is a bead chain and the narrowed cord passage on the underside of housing 4 functions as stop for the beads of bead chain 8.

[0044] The outer end of second pull cord 21 is connected to an outer end of recoil spring 12. In the shown preferred embodiment this connection is indirect, i.e. via cord reel 20.

[0045] The operation of the transmissions will be explained in more detail with reference to figures 5A and 5B.

[0046] Figure 5A is a schematic view with a variant of the transmission in a first position or rest position, and

[0047] Figure 5B is a schematic view of the transmission of figure 5A in a second position or operational position.

[0048] In the variant of the transmission the second unidirectional coupling of figure 3 is shown with a variant of activator 42. Each of the protrusions 422 is provided with a securing element 426 extending in peripheral direction of flange 421.

[0049] When operating element 8 is operated in counterclockwise direction (arrow L), each protrusion 422 slides under the nearby arm 412 and forces it to bend outward in radial direction of unidirectional coupling 41. Hooks 413 engage in toothed wheel 43, as a result of which drive element 60 co-rotates in counterclockwise direction.

[0050] When operating element 8 is no longer being operated by the user, recoil spring 12 ensures that activator 42 moves in clockwise direction (arrow R). As a result each securing element 426 slides partially over and locks the nearby arm 412. Drive element 60 can rotate freely round unidirectional coupling 41.

[0051] It is noted that the number of arms of the unidirectional coupling can vary, preferably between two and four. The number of protrusions of the activator has to be the same. The securing element or locking element on the protrusion of the activator is optional. Although the variant of figure 5A and figure 5B is illustrated only on the basis of second activator 42, it is likewise suitable for first activator 32. In addition to the shown unidirectional coupling, which is based on a ratchet-pawl mechanism, alternative unidirectional couplings are further available in the relevant field, such as a throttle spring.

[0052] Figure 6 shows a variant of the drive element in the operating device of figures 2 and 3. Drive element 60' is provided with a straight toothing 63 for co-action with the first unidirectional coupling 31 and second unidirectional coupling 41.

[0053] Although the operating device according to the invention has been elucidated on the basis of a roller blind system, it will be apparent that the operating device is universally applicable with other types of window covering. A skilled person in the field will appreciate that this can be achieved by adapting the drive element for co-action with a type of plug other than the end plug for connection to the screen shaft of another type of window covering.

[0054] The invention is of course not therefore limited to the described and shown preferred embodiments but extends to any embodiment falling within the scope of protection as defined in the claims and as seen in the light of the foregoing description and accompanying drawings.

Claims

1. Operating device (1) for a screen, such as a window covering (100), which screen is provided with a screen shaft, said operating device comprising: a drive element (60; 60') for the screen shaft,

- a first operating mechanism comprising a first operating element (7) which is connected to a first movement transfer element (10) connected by means of a first transmission to the drive element, wherein the first operating mechanism is configured to convert a linear movement of the first operating element to a rotational movement of the drive element for operating the screen shaft in a first rotational direction,

- a second operating mechanism comprising a second operating element (8) which is connected to a second movement transfer element (20) connected by means of a second transmission to the drive element, wherein the second operating mechanism is configured to convert a linear movement of the second operating element to a rotational movement of the drive element for operating the screen shaft in a second rotational direction opposite to the first rotational direction, wherein the first transmission is provided with a first unidirectional coupling (31) and a first toothed wheel (33; 63) on the drive element for co-action with the first unidirectional coupling in an operational position, wherein the second transmission is provided with a second unidirectional coupling (41) and a second toothed wheel (43; 63) on the drive element for co-action with the second unidirectional coupling in an operational position, wherein the first transmission is further provided with a first activator (32) for activating the operational position of the first unidirectional coupling, wherein the first movement transfer element (10) is connected to the first activator, and wherein the second transmission is further provided with a second activator for activating the operational position of the second unidirectional coupling, wherein the second movement transfer element is connected to the second activator, characterized in that the first unidirectional coupling (31) is provided with a central first body (310) with a first opening (311) and a number of flexible first arms (312) and the second unidirectional coupling (41) is provided with a central second body (410) with a second opening (411) and a number of flexible second arms (412),

wherein the first activator (32) is provided with a first flange (321) with a number of first protrusions (322) for bending the first arms (312) outward in radial direction of the first unidirectional coupling (31) and that the second activator (42) is provided with a second flange (421) with a number of second protrusions (422) for bending the second arms (412) outward in radial direction of the second unidirectional coupling (41).

2. Operating device as claimed in claim 1, wherein each of the protrusions (422) is provided with a securing element (426) which extends in peripheral direction of the flange (421) for the purpose of locking one of the flexible arms (412).

3. Operating device as claimed in any of the foregoing claims, comprising a housing (2, 4) with a passage (3, 5) for connecting the screen shaft to a pin (104) in which the first movement transfer element (10) and the second movement transfer element (20) and a spring (12) are accommodated.

4. Operating device as claimed in any of the foregoing claims, wherein the drive element (60') is provided on the inner side with the first and the second toothed wheel (63).

5. Operating device as claimed in any of the foregoing claims, wherein the first and the second toothed wheel are formed by one toothed wheel (63) with straight toothing.

6. Operating device as claimed in any of the foregoing claims 3-5,
wherein the first unidirectional coupling (31) is arranged round a connecting bush (50) for the drive element, which connecting bush is arranged on the pin (104).

7. Operating device as claimed in any of the foregoing claims 3-6,
wherein the second unidirectional coupling (41) is arranged round a collar (6) around the passage (5) of the housing (4).

8. Operating device as claimed in any of the foregoing claims 3-7,
wherein the first activator (31) and the second activator (41) are arranged coaxially round the pin (104) in the passage (3, 5) of the housing (2, 4).

9. Screen, such as a window covering (100), provided with an operating device (1) as claimed in any of the foregoing claims.

Ansprüche

1. Betätigungsvorrichtung (1) für einen Schirm, wie eine Fensterabdeckung (100), welcher Schirm mit einer Schirmwelle versehen ist, wobei die Betätigungsvorrichtung umfasst: ein Antriebselement (60; 60') für die Schirmwelle, einen ersten Betätigungsmechanismus, der ein erstes Betätigungselement (7) umfasst, das mit einem ersten Bewegungsübertragungselement (10) verbunden ist, das mittels eines ersten Getriebes mit dem Antriebselement verbunden ist, wobei der erste Betätigungsmechanismus so konfiguriert ist, dass er eine lineare Bewegung des ersten Betätigungselements in eine Drehbewegung des Antriebselements umwandelt, um die Schirmwelle in einer ersten Drehrichtung zu betreiben, einen zweiten Betätigungsmechanismus, der ein zweites Betätigungselement (8) umfasst, das mit einem zweiten Bewegungsübertragungselement (20) verbunden ist, das mittels eines zweiten Getriebes mit dem Antriebselement verbunden ist, wobei der zweite Betätigungsmechanismus so konfiguriert ist, dass er eine lineare Bewegung des zweiten Betätigungselements in eine Drehbewegung des Antriebselements zum Betreiben der Schirmwelle in einer zweiten Drehrichtung entgegengesetzt zur ersten Drehrichtung umwandelt, wobei das erste Getriebe mit einer ersten unidirektionalen Kupplung (31) und einem ersten Zahnrad (33; 63) auf dem Antriebselement zum Zusammenwirken mit der ersten unidirektionalen Kupplung in einer Betriebsstellung versehen ist, wobei das zweite Getriebe mit einer zweiten unidirektionalen Kupplung (41) und einem zweiten Zahnrad (43; 63) wobei das zweite Getriebe mit einer zweiten unidirektionalen Kupplung (41) und einem zweiten Zahnrad (43; 63) an dem Antriebselement zum Zusammenwirken mit der zweiten unidirektionalen Kupplung in einer Betriebsposition versehen ist, wobei das erste Getriebe ferner mit einem ersten Aktivator (32) zum Aktivieren der Betriebsposition der ersten unidirektionalen Kupplung versehen ist, wobei das erste Bewegungsübertragungselement (10) mit dem ersten Aktivator verbunden ist, und wobei das zweite Getriebe ferner mit einem zweiten Aktivator zum Aktivieren der Betriebsposition der zweiten unidirektionalen Kupplung versehen ist, wobei das zweite Bewegungsübertragungselement mit dem zweiten Aktivator verbunden ist, dadurch gekennzeichnet, dass die erste unidirektionale Kupplung (31) mit einem zentralen ersten Körper (310) mit einer ersten Öffnung (311) und einer Anzahl von flexiblen ersten Armen (312) versehen ist und die zweite unidirektionale Kupplung (41) mit einem zentralen zweiten Körper (410) mit einer zweiten Öffnung (411) und einer Anzahl von flexiblen zweiten Armen (412) versehen ist, wobei der erste Aktivator (32) mit einem ersten Flansch (321) mit einer Anzahl von ersten Vorsprüngen (322) versehen ist, um die ersten Arme (312) in radialer Richtung der ersten unidirektionalen Kupplung (31) nach außen zu biegen, und dass der zweite Aktivator (42) mit einem zweiten Flansch (421) mit einer Anzahl von zweiten Vorsprüngen (422) versehen ist, um die zweiten Arme (412) in radialer Richtung der zweiten unidirektionalen Kupplung (41) nach außen zu biegen.

2. Betätigungsvorrichtung nach Anspruch 1, wobei jeder der Vorsprünge (422) mit einem Sicherungselement (426) versehen ist, das sich in Umfangsrichtung des Flansches (421) erstreckt, um einen der flexiblen Arme (412) zu verriegeln.

3. Betätigungsvorrichtung nach einem der vorhergehenden Ansprüche, umfassend ein Gehäuse (2, 4) mit einem Durchgang (3, 5) zur Verbindung der Schirmwelle mit einem Stift (104), in dem das erste Bewegungsübertragungselement (10) und das zweite Bewegungsübertragungselement (20) sowie eine Feder (12) untergebracht sind.

4. Betätigungsvorrichtung nach einem der vorhergehenden Ansprüche, wobei das Antriebselement (60') auf der Innenseite mit dem ersten und dem zweiten Zahnrad (63) versehen ist.

5. Betätigungsvorrichtung nach einem der vorangehenden Ansprüche, wobei das erste und das zweite Zahnrad durch ein Zahnrad (63) mit gerader Verzahnung gebildet sind.

6. Betätigungsvorrichtung nach einem der vorstehenden Ansprüche 3 bis 5, wobei die erste unidirektionale Kupplung (31) um eine auf dem Stift (104) angeordnete Verbindungsbuchse (50) für das Antriebselement angeordnet ist.

7. Betätigungsvorrichtung nach einem der vorangehenden Ansprüche 3-6, wobei die zweite unidirektionale Kupplung (41) um einen Kragen (6) um den Durchgang (5) des Gehäuses (4) herum angeordnet ist.

8. Betätigungsvorrichtung nach einem der vorangehenden Ansprüche 3-7, wobei der erste Aktivator (31) und der zweite Aktivator (41) koaxial um den Stift (104) im Durchgang (3, 5) des Gehäuses (2, 4) angeordnet sind.

9. Schirm, wie z.B. eine Fensterabdeckung (100), versehen mit einer Betätigungsvorrichtung (1) nach einem der vorangehenden Ansprüche.

Revendications

1. Dispositif de manoeuvre (1) pour un écran, tel qu'une couvre-fenêtre (100), lequel écran est pourvu d'un arbre d'écran, ledit dispositif de manoeuvre comprenant : un élément d'entraînement (60 ; 60') pour l'arbre d'écran un premier mécanisme de manoeuvre comprenant un premier élément de manoeuvre (7) relié à un premier élément de transfert de mouvement (10) relié à l'élément d'entraînement au moyen d'une première transmission, le premier mécanisme de manoeuvre étant configuré pour convertir un mouvement linéaire du premier élément de manoeuvre en un mouvement de rotation de l'élément d'entraînement pour manoeuvrer l'arbre d'écran dans un premier sens de rotation, un deuxième mécanisme de manoeuvre comprenant un deuxième élément de manoeuvre (8) relié à un deuxième élément de transfert de mouvement (20) relié à l'élément d'entraînement au moyen d'une deuxième transmission, le deuxième mécanisme de manoeuvre étant configuré pour convertir un mouvement linéaire du deuxième élément de manoeuvre en un mouvement de rotation de l'élément d'entraînement pour manoeuvrer l'arbre d'écran dans un deuxième sens de rotation opposé au premier sens de rotation, la première transmission étant munie d'un premier coupleur unidirectionnel (31) et d'une première roue dentée (33 ; 63) sur l'élément d'entraînement pour coopérer avec le premier coupleur unidirectionnel dans une position opérationnelle, la deuxième transmission étant munie d'un deuxième coupleur unidirectionnel (41) et d'une deuxième roue dentée (43 ; 63) sur l'élément d'entraînement pour coopérer avec le deuxième coupleur unidirectionnel dans une position opérationnelle ; la première transmission étant en outre pourvue d'un premier activateur (32) pour activer la position opérationnelle du premier coupleur unidirectionnel, le premier élément de transfert de mouvement (10) étant relié au premier activateur, et la deuxième transmission étant en outre pourvue d'un deuxième activateur pour activer la position opérationnelle du deuxième coupleur unidirectionnel, le deuxième élément de transfert de mouvement étant relié au deuxième activateur, caractérisé en ce que le premier coupleur unidirectionnel (31) est muni d'un premier corps central (310) avec une première ouverture (311) et une pluralité de premiers bras flexibles (312) et en ce que le deuxième coupleur unidirectionnel (41) est muni d'un deuxième corps central (410) avec une deuxième ouverture (411) et une pluralité de deuxièmes bras flexibles (412), le premier activateur (32) étant muni d'une première bride (321) avec une pluralité de premières protubérances (322) pour plier les premiers bras (312) vers l'extérieur en direction radiale du premier coupleur unidirectionnel (31) et que le deuxième activateur (42) est muni d'une deuxième bride (421) avec une pluralité de deuxièmes protubérances (422) pour plier les deuxièmes bras (412) vers l'extérieur en direction radiale du deuxième coupleur unidirectionnel (41).

2. Dispositif de manoeuvre selon la revendication 1, dans lequel chacune des protubérances (422) est munie d'un élément de fixation (426) qui s'étend en direction périphérique de la bride (421) dans le but de bloquer l'un des bras flexibles (412).

3. Dispositif de manoeuvre selon l'une quelconque des revendications précédentes, comprenant un boîtier (2, 4) avec un passage (3, 5) pour relier l'arbre de l'écran à une broche (104) et dans lequel sont logés le premier élément de transfert de mouvement (10) et le deuxième élément de transfert de mouvement (20) ainsi qu'un ressort (12).

4. Dispositif de manoeuvre selon l'une quelconque des revendications précédentes, dans lequel l'élément d'entraînement (60') est muni, du côté intérieur, de la première et de la deuxième roue dentée (63).

5. Dispositif de manoeuvre selon l'une quelconque des revendications précédentes, dans lequel la première et la deuxième roue dentée sont formées par une roue dentée (63) à denture droite.

6. Dispositif de manoeuvre selon l'une quelconque des revendications précédentes 3-5, dans lequel le premier coupleur unidirectionnel (31) est disposé autour d'une douille de connexion (50) pour l'élément d'entraînement, laquelle douille de connexion est disposée sur la broche (104).

7. Dispositif de manoeuvre selon l'une quelconque des revendications précédentes 3-6, dans lequel le deuxième coupleur unidirectionnel (41) est disposé autour d'un collet (6) autour du passage (5) du boîtier (4).

8. Dispositif de manoeuvre selon l'une quelconque des revendications précédentes 3-7, dans lequel le premier activateur (31) et le deuxième activateur (41) sont disposés de façon coaxiale autour de la broche (104) dans le passage (3, 5) du boîtier (2, 4).

9. Écran, tel qu'un couvre-fenêtre (100), équipé d'un dispositif de manoeuvre (1) tel que revendiqué dans l'une quelconque des revendications précédentes.

Drawing