EP2397645A1 - Mono-controlled motorized blind - Google Patents

Abstract

The blind has a winding shaft including a tubular body and a sleeve (18), and a platform integrated with the shaft. The platform comprises lower ballasting edge and a windable part (24) that connects the edge and the shaft. The shaft is rotated to unroll the windable part and to drive the edge in a direction opposite to the shaft. A stopping mechanism (46) comes into contact with the shaft to stop rotation of the shaft when the edge is blocked and the windable part is released.

Description

The present invention relates to a motorized blind comprising a winding shaft and an apron integral with the winding shaft and whose deployment of the deck is able to be interrupted when it encounters an obstacle.

Known motorized blinds with adjustable blades are installed along the bay windows. They comprise on the one hand a winding shaft mounted in an upper part of the bay and a set of stackable blades having a terminal support blade capable of stackably receiving the other blades of said set of blades. The winding shaft is controllable in rotation by means of an electric motor. On the other hand, the blinds comprise retaining means for retaining each of said blades and drive ribbons, usually called lacettes, and connecting said terminal support blade and the winding shaft freely passing through the other blades. The ribbons are able to be wrapped around the winding shaft, while the free support blade exerts on them a tension under the effect of gravity. The winding shaft is intended to be rotated to unwind the ribbons and cause the vertical drive of the terminal support blade in translation between a close position and a position remote from said shaft in which said retaining means retain from close to near said other blades facing said bay, while said final blade is suspended from the ribbons.

To avoid any disorder of the laces when the final blade encounters an obstacle, it was sought to interrupt in this case the movement of the motor by various methods. Also according to the document FR 2,149,395 , the motorized blind further comprises a stop mechanism comprising a control rod pivotally mounted in a direction substantially parallel to the winding shaft and adapted to come into contact with at least one of the ribbons. When the terminal support blade meets an obstacle and locks in translation, then the ribbon relaxes and the control rod pivots to actuate an electric switch to stop the control motor in rotation of the winding shaft.

The disadvantage of this device lies in the reliability of the stop mechanism and the rotation stop control of the winding shaft. Indeed, the control rod has a certain flexibility which requires a complete release of the ribbon for the switch is actuated, and efforts to exert on it to control the stopping of the electric motor are relatively important. In addition, if the motorized blind has only one stop mechanism for a single ribbon winding, and the final blade encounters an obstacle next to another ribbon winding, not equipped, it will take several seconds before that said other ribbon winding finally feels the voltage anomaly; the final blade then being stopped while it has a very pronounced slope, which is both unsightly and risky. We can of course overcome this disadvantage by equipping each of the ribbon windings around the winding shaft of a stop mechanism, but we find ourselves quickly having to manage many electrical conductors, including microswitches and a box electric. This significantly increases the price of the product.

Also, a problem that arises and that aims to solve the present invention is to provide a motorized blind including a stop mechanism more reliable and more economical, capable of interrupting the movement of the final blade, regardless of the location where is the obstacle.

For this purpose, the present invention provides a motorized blind comprising a winding shaft and an apron integral with said winding shaft. Said apron having a lower ballast border and at least one windable portion connecting said lower ballast border and said winding shaft, said at least one windable portion being able to be wound around said winding shaft, while said bottom edge ballast means exerts a tension on said at least one rollable portion, said winding shaft being adapted to be rotated to unwind said at least one rollable portion and to drive said lower ballast border in translation in an opposite direction said winding shaft, said motorized blind further comprising a stop mechanism mounted along said winding shaft and adapted to come into contact with said at least one windable part, said stop mechanism being intended for causing said winding shaft to stop rotating as soon as said lower ballast border is locked in translation and said at least one windable portion expands; according to the invention said stop mechanism engages said winding shaft to mechanically lock said winding shaft in rotation when said at least one windable portion expands.

Thus, a feature of the invention lies in the implementation of a stop mechanism, maintained in a fixed position along the winding shaft, which does not act on a switch to cut off the power supply. the drive motor of the shaft, but which comes directly into engagement with the shaft to lock it mechanically and thus interrupt the electric motor. Indeed, the latter is equipped, for example, with a device for measuring the rotational speed of its rotor, and when this speed undergoes a sudden change, in this case a deceleration, the power supply is then cut off instantly and the engine stopped. In this way, unlike the motorized blinds according to the prior art, for which the stop mechanism acts on the power supply of the motor via a switch, which induces a certain response time in stopping the rotating winding shaft, according to the invention, the winding shaft is instantly mechanically locked in rotation and it is this blockage which causes the stop of the electric motor which drives it. Therefore, the reliability of the stop mechanism, and hence the efficiency of the rotational stop of the winding shaft is large. Also, as soon as the lower ballast meets an obstacle, and the windable portion relaxes, the winding shaft whose rotation allows the deployment of the deck, is instantly immobilized. It will be observed that the rollable portion relaxes, not only at the end of the race of the lower ballast border, but when the lower ballast border meets an obstacle, in any of the positions between a close position of the shaft winding and a position away from the winding shaft.

Preferably, said stop mechanism is located outside said winding shaft, while said at least one windable portion extends between said stop mechanism and said winding shaft. In this way, it is easier to detect the loosening of the roll-up part when it occurs, whatever the position of the lower ballast border.

According to a feature of the invention particularly advantageous, said winding shaft comprises a tubular member adapted to receive a tubular motor inside said tubular member for driving said tubular member in rotation. In this way, the motorized blind can not only be produced at an advantageous cost, because these tubular motors associated with a tubular member are produced in large series for many other applications and therefore at an advantageous cost. They are used in particular for shutter type applications. They are also more compact. However, motorized blinds, according to the prior art, are usually equipped with a central motor dual output and therefore double reducer, which makes them on the one hand more complex, and on the other hand more expensive. In addition they are larger, and therefore the housing that hosts such a type of engine must also be of a larger volume.

Furthermore, the winding shaft advantageously has a catching tooth intended to cooperate with said stop mechanism to mechanically lock said winding shaft in rotation. Thus, as the winding shaft unfolds the deck, as soon as the state of the stop mechanism is changed by the voltage drop in the roll-up portion, it is driven radially towards the winding shaft and the hooking tooth that protrudes from the shaft. And, simultaneously when the gripping tooth rotational movement comes to the stop mechanism, it then engages in it and the shaft locks in rotation. The stop mechanism is indeed securely moored in the blind casing so as to retain the winding shaft.

More specifically, with regard to the stop mechanism, it advantageously comprises a movable feeler member having a first fixing end and a first contact end opposite said first fixing end and able to come into contact with said at least one rollable part. .

The first fixing end is preferably pivotally mounted along an axis substantially parallel to said winding shaft. Thus, the feeler member pivots, for example in a cradle traversed by the winding shaft, which cradle is mounted in a fixed position in the aforementioned casing. The contact end of the feeler member, against which the rollable portion is frictionally driven, extends substantially perpendicular to the center of the winding shaft, while the fastening end extends in a position offset laterally from the center of the shaft. The probe member thus extends in arc opposite the winding shaft. In addition, said stop mechanism preferably comprises a return spring of said feeler member for driving said feeler member in motion when said at least one rollable portion relaxes. Advantageously, and according to the aforementioned preferred embodiment, said feeler member is pivotally driven when said at least one rollable portion expands. Thus, when the rollable portion is under tension under the weight of the lower ballast edge, it then exerts a force on the contact end of the feeler member which is then held in a pivoted position where its contact end is removed of the winding shaft and in which the return spring is compressed. There is thus a stable equilibrium between the force of the roll-up portion on the contact end and the return force of the spring. Also, when the lower ballast meets an obstacle, the rollable portion relaxes and the return spring causes the pivoting of the feeler member and bringing the contact end of the winding shaft. It is this pivoting of the feeler member that allows the stop mechanism to engage the winding shaft to mechanically lock it.

In addition, said stop mechanism preferably comprises a movable locking member having a second fixing end and a second end of contact opposite to said second fixing end adapted to engage said winding shaft. Preferably, the second fixing end of the locking member is pivotally mounted along an axis substantially parallel to said winding shaft. Thus, since the feeler member is pivotally biased back by its return spring, simultaneously, the second contact end of the locking member, which is advantageously provided with a hook, engages the shaft. winding and in particular with the above-mentioned hooking tooth.

According to a particularly advantageous embodiment of the invention, the feeler member and the locking member form two distinct pieces, and said feeler member is intended to be driven in motion to come into contact with said locking member. in order to drive said locking member in motion. Preferably, said feeler member pivots to come into contact with said locking member so as to cause said locking member which pivots in turn. Such a feature allows, as will be explained below, the locking member to remain in the locking position, while the contact member can return to its pivoted position when the rollable portion is at again switched on.

Furthermore, it will be observed that the feeler member and the locking member may also, according to yet another embodiment, be movably mounted in translation to perform functions identical to the stop mechanisms. It is also envisaged that one is mobile in translation while the other is pivotal.

According to a particularly advantageous embodiment of the invention, said apron comprises, on the one hand, a set of blades having a terminal support blade forming said lower ballast border, and on the other hand at least one drive ribbon passing through said other blades and forming said at least one rollable portion. Also, said shaft has a circular track for receiving said at least one coiled drive tape. Preferably, the circular track is formed in the bottom of a grooved pulley, so as to guide perfectly the winding of the tape on itself.

It will be observed that the apron may also consist of a fabric adapted to be wound around the winding shaft, and the rollable part adapted to cooperate with the stop mechanism is formed by one of the side edges. of said canvas.

In addition, and according to yet another embodiment, the motorized blind further comprises: adjustable retaining means comprising a cord and an angular segment integral with said cord, together forming a loop around said winding shaft, said angular segment being able to be angularly driven by friction by said shaft to adjust the orientation of said blades; and also a mobile locking cap for blocking said angular segment with respect to said winding shaft in an intermediate angular position corresponding to a determined orientation of said blades; and finally, an unlocking element for driving said movable locking cap and for causing the release of said angular segment when said at least one driving tape is unwound. As will be explained below in more detail, such features allow the deployment of the deck consisting of stackable blades with a position of the latter inclined relative to the vertical so as to avoid the total occultation of the premises during this deployment.

• la Figure 1 est une vue schématique en perspective de détail d'éléments du store motorisé conforme à l'invention;
• la Figure 2 est une vue schématique en perspective de détail des éléments illustrés sur la Figure 1, de trois quarts avant droit;
• la Figure 3 est une vue schématique en perspective de détail des éléments illustrés sur la Figure 1, de trois quarts avant gauche;
• la Figure 4 est une vue schématique en coupe droite de l'élément illustré sur la Figure 2;
• la Figure 5 est une vue schématique en perspective d'un autre élément illustré sur la Figure 1 ;
• la Figure 6 est une vue schématique en perspective de l'élément illustré sur la Figure 2, de trois quarts arrière droit et équipé dudit autre élément représenté sur la Figure 5 ;
• la Figure 7 est une vue schématique en perspective de détail de l'objet représenté sur la Figure 6 ;
• la Figure 8 est une vue schématique en coupe droite de l'objet représenté sur la Figure 1 dans une première position de fonctionnement ; et,
• la Figure 9 est une vue schématique en coupe droite de l'objet représenté sur la Figure 1 dans une seconde position de fonctionnement.

Other features and advantages of the invention will emerge on reading the following description of a particular embodiment of the invention, given by way of indication but not limitation, with reference to the accompanying drawings in which:

• the Figure 1 is a schematic perspective view of detail of elements of the motorized blind according to the invention;
• the Figure 2 is a schematic perspective view of detail of the elements illustrated on the Figure 1 three quarters front right;
• the Figure 3 is a schematic perspective view of detail of the elements illustrated on the Figure 1 three quarters front left;
• the Figure 4 is a schematic cross-sectional view of the element shown on the Figure 2 ;
• the Figure 5 is a schematic perspective view of another element illustrated on the Figure 1 ;
• the Figure 6 is a schematic perspective view of the element shown on the Figure 2 , three quarters rear right and equipped with said other element shown on the Figure 5 ;
• the Figure 7 is a schematic perspective view of detail of the object represented on the Figure 6 ;
• the Figure 8 is a schematic cross-sectional view of the object represented on the Figure 1 in a first operating position; and,
• the Figure 9 is a schematic cross-sectional view of the object represented on the Figure 1 in a second operating position.

The Figure 1 partially illustrates a winding shaft comprising a tubular member 10 adapted to receive inside a tubular motor not shown. The tubular member 10 extends longitudinally along an axis of symmetry A and here passes through a return assembly 14, which comprises a cradle 16 intended to be held in a fixed position inside a longitudinal casing not shown and including the tubular member 10. The cradle 16 accommodates inside a functional sleeve 18 in which is fitted the tubular member 10 and to which it is connected in rotation through a longitudinal groove 20 of the tubular member 10. In addition, the cradle 16 has an upper window 17 and it comprises a movable cover 22 installed through the upper window 17 and which is adapted to cooperate with the functional sleeve 18 as will be explained hereinafter.

In addition, the movable hood 22 has in each of its corners, a fastening pin 19 and the fixing studs 19 of the movable cowl 22 are respectively engaged in an oblong orifice 23. Thanks to the oblong holes which extend in the lateral edges of the upper window 17, in directions which cut the tubular member 10, the cover 22 is movable in translation between a close position and a position away from the functional sleeve 18, while remaining prisoner of the cradle 16.

The elements described above are intended for the operation of a motorized blind with steerable blades not shown. Such a blind comprises a winding shaft formed of the tubular member 10 and a set of blades having a terminal support blade, or final blade, adapted to receive in stack the other blades of said set of blades. In addition, such a blind further comprises at least one other lift assembly 14 identical and spaced from the first. Also, and advantageously, the tubular member 10 is equipped with at least one lift assembly at each of its ends.

Furthermore, the motorized blind comprises, for each of the lift assemblies 14, a drive tape 24 forming the roll-up part and intended to connect the not shown support blade and the winding shaft formed of the tubular member 10. In moreover, the drive ribbon 24 is able to pass through the other blades of the blade set not shown here. Also appears more clearly on the Figure 2 , the functional sleeve 18 around which is wound ribbon 24 between two adjacent coaxial ribs 26, 28 forming the two opposite flanks of a pulley. The drive tape 24 is thus wound on itself around a circular track formed around the functional sleeve 18 and hidden, on the Figure 2 by the coaxial ribs 26, 28. Also, the not shown support blade exerts a tension T on the ribbon in a direction opposite to the functional sleeve 18.

The latter has an axial inner rib 30 intended to engage inside the longitudinal groove 20 of the tubular member 10 illustrated in FIG. Figure 1 , so that the rotational movement of the tubular member 10 induces the rotation of the functional sleeve 18 and causes the unwinding of the tape and thus the drive of the terminal support blade in translation opposite the tubular member 10. Furthermore, the functional sleeve 18 has, on the one hand, a groove 32 of trapezoidal axial section, adjacent to the pulley formed by the two coaxial ribs 26, 28, and which will be described below in more detail on the Figure 6 and on the other hand a truncated rib 34 circular. This truncated rib 34 constitutes a rock wheel and it extends in a plane substantially perpendicular to the axis of the functional sleeve 18 and the tubular member 10, opposite the pulley formed by the two coaxial ribs 26, 28 with respect to the trapezoidal groove 32. It defines a first free end 36 forming a hooking tooth projecting from the functional sleeve 18 with two opposite reinforcing cheeks 38, 40, on each side and joined by a bridge 42 which extends in an axial direction. Opposite the first free end 36 forming a hooking tooth, the truncated rib 34 has a second free end 44 chamfered and able to form ramp. Also, the truncated rib 34 has a notch 45 between its two opposite free ends 36, 44.

In addition, the motorized blind comprises a stop mechanism 46 installed along the functional sleeve 18, and integral with the cradle 16 not shown in this Figure 2 . This stop mechanism 46 first comprises a feeler member 48 installed facing the pulley formed by the two adjacent coaxial ribs 26, 28 to cooperate with the ribbon 24 and a locking member 50 installed opposite the truncated rib. 34 to cooperate with the hooking tooth 36. The blocking member 50 and the feeler member 48 are thus mounted at a distance from one another along the functional sleeve 18.

It will be observed that the locking member 50 has a general prismatic shape, the advantages of which will be explained below, whereas the feeler member 48 extends in an arc. The latter has a first fixing end 52 on the inside of the cradle 16 and a first opposite contact end 54 against which the ribbon 24 comes to bear substantially perpendicular to the axis M of the functional sleeve 18. Thus, the first contact end 54 and the first attachment end 52 are radially spaced from the tubular sleeve 18 substantially the same distance and angularly offset relative to each other vis-a-vis the functional sleeve 18. As well as it will be explained hereinafter, the stop mechanism 46 is located outside the functional sleeve 18 so as to be actuable while the drive tape 24 is still wound around the functional sleeve 18.

The feeler member 48 is presented in a vacuum on the Figure 2 for explanation purposes. On the other hand, its attachment end 52 is pivotally mounted on the inside of the cradle 16 about a feeler member axis 56 substantially parallel to the axis M of the functional sleeve 18. In addition, the feeler member 48 has a heel 58 in which is housed a return spring 60 adapted to extend behind the feeler member 48 to abut against the inside of the cradle 16. Therefore, the feeler member 48 is rotated by the return spring 60 for driving the first contact end 54 towards the functional sleeve 18. This is actually the ribbon 24 when it is stretched which exerts efforts on the first contact end 54 tending to move it away from the functional sleeve 18 and thereby compressing the return spring 60. In this way, when the functional sleeve 18 is rotated through the tubular member 10, the tensioned ribbon 24 is frictionally driven against the first end. contact 54 of the probe member 48 which is then held pivoted in a position away from the functional sleeve 18.

The locking member 50 has a second fastening end 62 pivotally mounted on the inside of the cradle 16 around a locking member axis 64 substantially parallel to the feeler member axis 56. In contrast to the second fixing end 62, the locking member 50 has a second contact end 66 having a return 68 forming a hook oriented towards the axis M of the functional sleeve 18.

In addition, the feeler member 48 has between these two opposite ends 54, 52 a lateral profiled lug 70 oriented towards the locking member 50, while the locking member 50 has between its two opposite ends 62, 66 a profile receiving member 72 oriented toward the feeler member 48 so as to cooperate with the profiled lateral lug 70.

We find more precisely on the Figure 3 the receiving profile 72 of the locking member 50 and the profiled lateral lug 70 of the feeler member 48. The receiving profile 72 is open in a direction opposite to the functional sleeve 18, while the profiled lateral lug 70 extends opposite the opening of this receiving section 72.

Thus, as soon as the functional sleeve 18 is rotated in the direction of clockwise on the Figure 3 , through the tubular member 10 not shown, the ribbon 24 is unwound in a direction opposite to the functional sleeve 18 to allow the deployment of the deck consisting of the aforementioned blades. The ribbon 24 is then stretched and is frictionally driven against the first contact end 54 of the feeler member 48 which is then kept away from the functional sleeve 18. It will also be observed, on the one hand, that in this operating phase , the locking member 50 is independent of the feeler member 48, and secondly that the truncated rib 34, while rotating, maintains the second contact end 66 of the locking member at a distance from the sleeve 18, except between the two opposite ends 36, 44 of the truncated rib 34. It will be explained hereinafter, with reference to FIG. Figure 4 that such a characteristic is advantageous when the functional sleeve 18 is rotated in the opposite direction.

Referring back to Figure 3 in a phase of deployment of the apron, since the terminal support blade of the blade deck meets an obstacle, the ribbon 24 relaxes and relaxes while the tubular member and the functional sleeve 18 continue their rotation. The relaxation of the drive ribbon 24 occurs as soon as the terminal support blade encounter an obstacle between its position close to the functional sleeve 18 and its end-of-travel position, separated from the functional sleeve 18.

Also, as soon as the tension in the ribbon 24 drops, the feeler member 48 then pivots thanks to the action of its return spring 60 and the first contact end 54 of the feeler member 48 is driven towards the functional sleeve. 18. As a result, the lateral profiled lug 70 bears against the inside of the reception profile 72 of the locking member 50 and, continuing its travel, causes the locking member 50 to pivot in the same direction and therefore, the second contact end 66 is brought closer to the functional sleeve 18. This second contact end 66 then bears against the truncated rib 34 as illustrated by FIG. Figure 4 . On this Figure 4 , the functional sleeve 18 is rotated in a counterclockwise direction, corresponding to the operating phase described above at the location of the Figure 3 . And as soon as the notch 45 of the truncated rib 34 comes opposite the second contact end 66, the locking member 50 then pivots towards the axis M of the functional sleeve 18, and the second contact end 66 enters the inside of the notch 45, while the attachment tooth 36 engages against the hook return 68 of the locking member 50. In this way, the functional sleeve 18 and the tubular member 10 which 'drives in rotation, are stopped net, and the tubular motor which drives them is stopped. Indeed, the tubular motor comprises means for measuring the speed of rotation of its rotor. And as soon as this speed of rotation falls suddenly, the tubular motor is stopped.

The force exerted by the hooking tooth 36 on the locking member 50 is relatively important with regard to the rigidity of the connection between its second fastening end 62 and the inside of the cradle 16. Also, the 50, when it receives the attachment tooth 36, is forced between the inner wall of the not shown blind housing and the functional sleeve 18 and thanks to its prismatic wedge shape, it hangs tangentially relative to the sleeve 18. Such an operation assumes that the connection between the second fastening end 62 of the locking member 50 and the inside of the cradle 16 is substantially deformable to allow the tangential movement of the locking member 50.

Thus, when the ribbon 24 expands, the stop mechanism 46 causes the mechanical blocking of the tubular member 10 in rotation.

In addition, when the terminal support blade is released from its obstacle, the ribbon 24 becomes taut again, and the feeler member 48 then pivots by releasing the locking member 50. The latter nevertheless remains in its retaining position of the tooth d hooking 36, as long as the functional sleeve 18, has not been rotated in an opposite direction, so that the final blade can move up and away from the obstacle that can then be eliminated. In addition, when it is rotated in the opposite direction, the second chamfered free end 44 of the truncated rib 34 forms a ramp and bears against the return edge 68 of the second contact end 66 which causes the tilting of the locking member 50 to its initial position. Thus, when the functional sleeve 18 is again rotated in the direction of unwinding of the ribbon 24, the attachment tooth 36 escapes the return range 68 of the second contact end 66 and the apron can thus again deploy.

We will now refer to Figures 5 and 6 , illustrating for the first, adjustable retaining means 80 of the apron blades and for the second, these adjustable retaining means 80 installed in the trapezoidal groove 32 of the functional sleeve 18. Thus, on the Figure 5 the adjustable retaining means 80 comprise a cord 82 and an angular segment 84. This angular segment 84 has two opposite segment cheeks 86, 88 spaced apart from each other. Each of these cheeks 86, 88 is substantially inclined relative to a median plane which extends between the two, so as to be able to engage inside the trapezoidal groove 32 forming a clutch. Moreover, the cord 82 extends in an arc between the two cheeks 86, 88 of the angular segment 84 and is locked therein in translation by means of a crimped element 90 held in a fixed position inside the segment 84 The segment 84 and the cord 82 thus form a loop, of which two opposing strands 92, 94 extend to receive the opposite amounts of the support ladder of the apron blades. Thus, the rotation of the tubular member, and therefore of the functional sleeve 18, causes the segment 84 to be engaged within the trapezoidal groove 32, which makes it possible to drive into position. translating the two opposing strands 92, 94 in opposite directions, and thus simultaneously modifying the orientation of the apron blades.

In addition, the segment 84 has two opposite abutment ends, a rising abutment end 96, and a lowering abutment end 98, respectively able to abut against opposite abutments, a rest stop 99 and a stop of descent 101, arranged in the cradle 16 and that can be seen on the Figures 8 and 9 which will be referred to below. Therefore, the segment 84 is held in a fixed position, when its upstanding bearing end 96 bears against the upstart stop 99, and the functional sleeve 18 is rotated, clockwise on the Figure 8 , to fold the apron. Also, the two opposite walls of the trapezoidal groove 32 are respectively driven in sliding against the two opposite cheeks 86, 88 of the segment 84. In this position of the segment 84, the apron blades are inclined horizontally in a position of transparency.

Before describing the deployment of the deck, where the functional sleeve 18 is rotated in a counter-clockwise direction, it will be described in more detail with reference to the figure 7 .

Thus, the functional sleeve 18 has a spring rod 100 that can be activated when the circular track of the pulley formed by the two coaxial ribs 26, 28 is released from the ribbon 24. This is the case when the apron is approaching its position. fully deployed. The spring rod 100 has an anchoring portion 102 which extends in an arc along a circular fastening rib 104 adjacent to one of the coaxial ribs 26 and a return portion 106 which extends in an axial direction. across the groove of the pulley formed by the two coaxial facing ribs 26, 28. To do this, the circular fastening rib 104 has a non-through radial oblong hole 108 for guiding and retaining the return portion 106, while the two coaxially facing ribs 26, 28 respectively have two radial slots 110, 112 facing in the axial extension of the radial oblong hole 108. Thus, the return portion 106 is on this Figure 7 in its free position away from the circular track of the pulley formed by the two coaxial ribs 26, 28. When the ribbon 24 is wrapped around the pulley, the return portion 106 is held against the circular track in the bottom of the pulley.

We will refer again to Figures 8 and 9 , on which we find, the cradle 16 and the functional sleeve 18 inside and the movable cover 22. The latter has, inside, a stop tab 114 adapted to come between the two cheeks opposed 86, 88 of the segment 84, while the latter has a stop bridge 116 which extends precisely between the two opposite cheeks 86, 88, substantially midway between the two opposite bearing ends 96, 98. We also find on these Figures 8, 9 , the fixing studs 19 and the oblong orifices 23 inside which they are engaged.

Thus, from an angular position where the segment 84 is held in a fixed position and its resting support end 96 is in abutment against the upstart stop 99, when the functional sleeve 18 is rotated according to the opposite direction of clockwise as illustrated by the Figure 8 not only does the segment 84 engage within the trapezoidal groove 32, and the opposing strands 92, 94 are driven so as to pivot the apron blades which then assume a semi-occultation position, corresponding to inclined blades, but also the ribbon 24 unfolds to deploy the deck, while the movable cover 22 is in a position close to said functional sleeve 18. The stop tab 114 is then engaged between the two opposite cheeks 86, 88 of the segment. 84, while the stop bridge 116 abuts against the stop tab 114, which blocks the angular segment 84 in an intermediate angular position corresponding to an inclined position of the blades. As the functional sleeve 18 continues to rotate, the two opposite walls of the trapezoidal groove 32 are respectively slidably driven against the two opposite cheeks 86, 88 of the segment 84.

When the apron approaches its fully extended position, all the blades of the blade set lie in the ladders and the ribbon 24 does not suddenly support anything, and the additional rotation of the functional sleeve 18 causes the slack 24 to loosen. ribbon 24 is determined so that it relaxes at a moment of the course where it covers only an angular fraction of the circular track. Thus, the ribbon 24 releases the return portion 106 which is initially applied against the circular track and which is then driven in a position away from the circular track with the spring rod 100 which relaxes. The portion of the return portion 106 which extends between said one of the coaxial ribs 26 and the adjacent circular fastening rib 104, and which therefore deviates radially from the functional sleeve 18 abuts against an interior receiving zone of the movable cowl 22 and drives the latter in motion in a position away from the functional sleeve 18, as illustrated by FIG. Figure 9 . In this way, the stop bridge 116 escapes the stop tab 114, and the functional sleeve 18 continues its rotational movement, it then drives the angular segment 84 in motion on an angular fraction, until the The downstop end 98 of the segment 84 bears against the downstop 101. With this movement of the angular segment 84 on said angular fraction, the blades of the blade set are oriented vertically in the occultation position.

In addition, the ribbon 24 is further expanded and the stop mechanism 46 is activated as indicated above, so as to mechanically lock the functional sleeve 18 and the tubular member 10 and therefore to stop the tubular motor.

It will be recalled, on the one hand that the stop mechanism comprising the feeler member 48 and the locking member 50, can be made in one piece, and secondly that it can be adapted to blinds no longer with blades, but with canvas. The mechanism is then installed near the tubular member and at the edge of said fabric.

Claims (11)

Motorized blind comprising a winding shaft (10, 18) and an apron integral with said winding shaft, said deck having a lower ballast border and at least one windable portion (24) connecting said lower ballast border and said ballast shaft. winding (10, 18), said at least one windable portion (24) being adapted to be wound around said winding shaft, while said lower ballast edge exerts a tension on said at least one windable portion (24), said winding shaft (10, 18) being adapted to be rotated to unwind said at least one windable portion (24) and to cause said lower ballast to be driven in translation in a direction opposite to said winding shaft (10, 18), said motorized blind further comprising a stop mechanism (46) mounted along said winding shaft and adapted to come into contact with said at least one windable portion (24), said latch stopping anism (46) being intended to cause the rotational stopping of said winding shaft (10, 18) as soon as said lower ballast border is locked in translation and said at least one windable portion expands;
characterized in that said stop mechanism (46) engages said winding shaft (10,18) to mechanically lock said winding shaft in rotation when said at least one windable portion (24) expands. Motorized blind according to claim 1, characterized in that said stop mechanism (46) is located outside said winding shaft (10, 18), whereas said at least one windable portion (24) extends between said stop mechanism (46) and said winding shaft (10, 18). Motorized blind according to claim 1 or 2, characterized in that said winding shaft (10, 18) comprises a tubular member adapted to receive a tubular motor inside said tubular member (10) for driving said tubular member in rotation . Motorized blind according to any one of claims 1 to 3, characterized in that said winding shaft (10, 18) has a tooth hooking device (36) intended to cooperate with said stop mechanism (46) for mechanically locking said winding shaft (10, 18) in rotation. Motorized awning according to any one of claims 1 to 4, characterized in that said stop mechanism (46) comprises a movable feeler member (48) having a first attachment end (52) and a first contact end (54). ) opposite said first fixing end (52) and adapted to come into contact with said at least one rollable part (24). Motorized blind according to claim 5, characterized in that said stop mechanism (46) comprises a return spring (60) of said feeler member (48) for driving said feeler member in motion when said at least one rollable portion (24) relaxes. Motorized blind according to any one of claims 1 to 6, characterized in that said stop mechanism (46) comprises a movable locking member (50) having a second fixing end (62) and a second contact end ( 66) opposite said second securing end adapted to engage said winding shaft (10, 18). Motorized blind according to claims 5 and 7 or 6 and 7, characterized in that said feeler member (48) is intended to be driven in motion to come into contact with said locking member (50) so as to drive said locking member moving. Motorized awning according to any one of claims 1 to 8, characterized in that said apron comprises on the one hand a set of blades having a terminal support blade forming said lower ballast border, and on the other hand at least one ribbon d drive (24) passing through said other blades and forming said at least one rollable portion. Motorized awning according to claim 9, characterized in that said winding shaft (10, 18) has a circular path for receiving said at least one wound tape (24). Motorized blind according to claim 9 or 10, characterized in that it further comprises: - Adjustable retaining means comprising a cord (82) and an angular segment (84) integral with said cord, together forming a loop around said winding shaft (10, 18), said angular segment being able to be angularly driven by friction by said winding shaft (10, 18) to adjust the orientation of said blades; a movable locking cap (22) for locking said angular segment (84) with respect to said winding shaft (10, 18) in an intermediate angular position corresponding to a determined orientation of said blades; and, an unlocking element (100) for driving said movable locking cap (22) and for causing the release of said angular segment (84) when said at least one driving tape (24) is unwound.

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