Abstract:
This actuator device ( 1 ) is for actuating a release member for a motor and gearbox unit for applying rotary drive to a tube for winding a closure or solar protection screen. The release member is controlled by means of a cable. The device comprises a tensioner mechanism ( 20, 30 ) for tensioning the cable ( 11 ) in an actuation direction (Fa, Fa′), at least one locking means for locking the tensioner mechanism, and at least one unlocking means ( 41   a ) for unlocking the tensioner mechanism. The unlocking means are actuatable in a direction substantially perpendicular to the actuation direction.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention relates to a device for actuating a release member for a motor and gearbox unit that applies rotary-drive to a tube for winding a closure or solar protection screen. The invention also relates to a closure or solar protection installation including such a device. 
     The term closure installation is used to cover doors, gates, shutters, and equivalent pieces of equipment. 
     2. Brief Description of the Related Art 
     In this kind of installation, it is known to use an electric motor to rotate a tube for winding a panel that constitutes a door or a shutter or a solar protection blind. It is also known, e.g. from EP-A-0 597 780, to provide a drive release member so as to enable operation to be performed manually, in particular for safety reasons, to allow maintenance to be carried out on the installation, or in the event of an electrical power failure. The release member is controlled by a sheathed cable connected to an actuator device. With the help of an actuator device, the user acts on the tension of the cable and thus on the member for releasing the motor and gearbox unit, thereby enabling the motor to be uncoupled from the above-mentioned winding tube. 
     One such actuator device is described in FR-A-2 647 152. In that application, a release lever is secured to one-fourth of a toothed wheel having the release cable attached thereto. The tension in the cable is then proportional to the extent to which the toothed wheel portion is turned. To turn said portion, the lever is tilted in an operating direction perpendicular to the axis of the wheel. That device also includes a mechanism for locking the toothed wheel. A catch is received in one of the teeth of the wheel. When the wheel is turned through one tooth, the catch disengages from the tooth with which it was engaged and engages in the following tooth. The device is again locked. To unlock it, the user needs to act on a second lever in a direction that is colinear with the previous operating direction. That action has the effect of disengaging the catch from the toothed wheel which then becomes a “free wheel”. Because the actuation directions for locking and unlocking are colinear, there is a major risk of involuntarily action being taken. This risk increases if it is desired to make the device more compact than the device described. It has been found advantageous, in use, and for better control over the force exerted on the cable, for the device to be more compact, ergonomic, and suitable for being gripped firmly in one hand. The solution described in FR-A-2 647 152 also implies locking means that are distinct from the control lever, which is not favorable to reducing overall size. 
     SUMMARY OF THE INVENTION 
     To mitigate the problems described above, the invention proposes a compact and ergonomic device that ensures safe unlocking of the mechanism for applying tension to the release cable. 
     To this end, the invention relates to an actuator device for actuating a release member for a motor and gearbox unit for applying rotary drive to a tube for winding a closure or solar protection screen, the release member being controlled by means of a cable. The actuator device comprises a tensioner mechanism for tensioning the cable in an actuation direction, at least one locking means for locking the tensioner mechanism, and at least one unlocking means for unlocking the tensioner mechanism. The unlocking means are actuatable in a direction substantially perpendicular to the actuation direction. 
     Thus, the invention eliminates the risk of actuating the unlocking means in untimely manner. 
     According to aspects of the invention that are advantageous but not essential, the device incorporates one or more of the following features: 
     The tensioner mechanism forms a deformable handle that can be held in one hand. An actuator device in the form of a handle serves to facilitate actuating the cable and to control the sensitivity of the operating force. It is important to be able to control the traction force exerted, since too great a force would run the risk of damaging the cable return mechanism. Ergonomic handle shapes, e.g. notch shapes, enable the handle to be held securely and force to be well controlled. 
     The tensioner mechanism comprises a first part to which the cable is fastened, and a second part to which a sheath of said cable is fastened, the two parts being mounted to be movable relative to each other. The locking means is then suitable for blocking the degree of freedom between the two moving parts. The movement of one part relative to the other thus delivers traction to the release cable and thereby acts on the release member. Furthermore, the blocking by the locking means ensures that the force on the cable is maintained and thus that the state of the release member is maintained. 
     The two parts are mounted to pivot relative to each other, the lever effect making it possible to obtain a long stroke in a contact unit. 
     The unlocking means comprise at least one tooth disposed on one of the moving parts of the tensioner mechanism and suitable for co-operating with a set of teeth disposed on the other moving part of the tensioner mechanism. 
     The unlocking means is disposed on one of the moving parts, thus making the device more compact. 
     At least one of the two parts of the tensioner mechanism includes means for marking the relative position between the two parts. This marking indicates the position of one moving part relative to the other, which amounts to giving an indication concerning the traction force exerted on the cable and thus about the state in which the release member is to be found. 
     The device includes two unlocking means, the two unlocking means being actuated simultaneously in order to obtain unlocking. This solution serves to increase the safety of unlocking against wrong operation: it is necessary to actuate both means simultaneously in order to obtain effective unlocking of the mechanism when under tension. 
     The two unlocking means act on the locking mechanism on either side of the actuation direction, so as to obtain a device that is compact. 
     The invention also provides a closure or solar protection installation that includes an actuator device of the type defined above. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention can better understood on reading the following description given purely by way of example and made with reference to the accompanying drawings, in which: 
         FIG. 1  is a face view of the actuator device of the invention, shown in the “released” position, the release member releasing the motor and gearbox unit; 
         FIG. 2  is a view of the right side of the actuator device of the invention; 
         FIG. 3  is a plan view of the actuator device of the invention; 
         FIG. 4  is a view from beneath of the actuator device of the invention; and 
         FIG. 5  is a face view of the area denoted as V in  FIG. 1 . 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     The actuator device shown in  FIGS. 1 to 4  is for controlling a release member of the type described in EP-A-0 597 780, a brake control device of the type described in FR-A-2 612 246, or any other similar type of member. 
     Such a release member can be as follows: in a device for operating an installation for closing or providing protection against the sun that includes a winding tube rotated by a tubular motor supported by a base constrained to rotate with a toothed wheel, the release member comprises, for example, a blocking latch movable in translation between a first position in which the latch prevents rotation of the toothed wheel, and a second position in which the latch does not interact with the toothed wheel. 
     By pulling on an operating cable, a rod, or a strap, the blocking latch is moved in translation easily and intuitively, including in an emergency or panic situation. 
     For better operation, provision may also be made of a mechanism for resiliently returning the cable by repositioning the cable in a rest position when it is no longer under tension. Such devices are known and are often integrated in the release member. 
     The actuator device as shown in  FIGS. 1 to 4  is in the form of a release handle  1  made up of two moving parts  20  and  30 . The first moving part  20  is engaged in the second moving part  30 . The second moving part  30  then covers part of the first moving part. 
     A cable  11  protected by a sheath  12  connects the release handle  1  to the release member (not shown). The cable  11  is mounted on the handle  1  by applying the following steps. The cable  11  is passed through an opening  22  in the first moving part  20 , and then through an opening (not shown) in the second moving part  30 . A cable clamp  13  is then fixed on the cable  11  in the desired position. In operation, the cable clamp  13  is completely housed in a cavity  31  formed in the second moving part  30 . As a result, the handle  1  is ergonomic without any accessible sharp part. The sheath  12  comes to bear against a top face  21  of the first moving part  20 . The two moving parts  20  and  30  can pivot relative to each other about a transverse pin  50 . The transverse pin  50  is at a distance from the openings provided for passing the cable in the moving parts  20  and  30 , thereby forming a lever arm. Consequently, when a hand is tightened over the two moving parts  20  and  30 , substantially in directions Fa and Fa′, these two parts pivot relative to each other and thus move apart the end of the sheath  12  and the cable clamp  13 . This movement applies tension to the cable, and thus actuates the release member. 
     Because of the selected dimensions and an ergonomic shape, the handle  1  is easily manipulated in one hand and makes it possible to control the tension applied to the cable. 
     To increase the accuracy of control and to maintain a constant tension on the cable, locking means  40   a  are provided for locking the two moving parts  20  and  30  relative to each other. The locking means  40   a  comprise firstly a set of teeth  35   a  that are situated on an inside peripheral zone of the second moving part  30 . The set of teeth  35   a  is generally in the form of a circular arc substantially centered on the pin  50 . 
     The locking means  40   a  also comprises a tooth  26   a  secured to the first moving part  20 . Naturally, an inverse disposition of the tooth  26   a  and the set of teeth  35   a  being on the second and first moving parts  30  and  20  could be envisaged. 
     The tooth  26   a  and the set of teeth  35   a  co-operate when the two moving parts overlap at least in part so as to block the two moving parts  20  and  30  relative to each other. This blocking serves to prevent the release cable  11  from returning to its equilibrium position. 
     The slopes of the inclined teeth in the set of teeth  35   a  and of the co-operating tooth  26   a  are thus implemented in such a manner as to facilitate the movement of tensioning the cable (the teeth of the set of teeth  35   a  present a sloping ramp profile in this direction), and to block the return movement towards the equilibrium position of the cable  11  (the teeth of the set of teeth  35   a  present a stop profile in this direction). 
     Furthermore, the bottom end of the first moving part  20  is also provided with a slot  24   a . This slot  24   a  defines a tab  23   a  with a small amount of resilience, on which the tooth  26   a  is mounted. The resilience of the tab  23   a  depends on the size of the slot  24   a.    
     This resilience determines the operating force and has an influence on the sensation perceived by the user when actuating the handle  1 , on the release force, and possibly also on the audible sound that occurs on passing a tooth of the set of teeth. This audible effect contributes to the ergonomics of the device and to controlling the operating force. 
     Unlocking means  41   a  are provided for enabling the device to be released once it has become locked. The unlocking means  41   a  comprise an unlocking button  32   a  that can be moved in a direction Fd substantially perpendicular to the actuation direction Fa or Fa′ of the device  1 , i.e. in a direction that is substantially perpendicular to the operating direction for tensioning the cable. The term “substantially” should be understood as being plus or minus 20°. 
     The button  32   a  is inserted in an opening  33   a  of the second moving part  30 . It is connected to the moving part  30  via a resilient tab  34   a , thus enabling the button  32   a  to be moved relative to the second moving part  30  in the direction Fd. The second moving part  30 , the button  32   a , and the tab  34   a  can naturally be obtained as a single molded part. 
     When moved in the direction Fd, the button  32   a  encounters a linear projection  25   a  disposed on the tab  23   a . The purpose of this linear projection  25   a  is to form a point of contact between the button  32   a  when it is actuated and the tab  23   a , regardless of the position of the moving parts  20  and  30  relative to each other. If the actuation of the button  32   a  is continued in the direction Fd, then the tab  23   a  flexes, thereby releasing the tooth  26   a  from the set of teeth  35   a . The device is then unlocked and the two moving parts  20  and  30  can return to a position in which the cable is in its equilibrium position. 
     The unlocking force thus depends on the resilience of the tab  23 , as mentioned above. The position and the size of the projection  25   a , and the dimensioning of the slot  24   a  are likewise parameters that have an influence on the unlocking force. 
     A preferred embodiment presents two locking means  40   a  and  40   b , and two unlocking means  41   a  and  41   b . The need to act simultaneously on both unlocking means  41   a  and  41   b  reinforces the safety of such a device against errors of manipulation. 
     The second locking and unlocking means  40   b  and  41   b  may be made symmetrically relative to the plane that contains the actuation direction Fa. The handle thus has a second tab  23   b , a second slot  24   b , a second linear projection  25   b , a second set of teeth  35   b , a second tooth  26   b , and also a second button  32   b , as shown in  FIG. 4 . 
     Nevertheless, provision can be made for devices that have only one locking and/or unlocking means  40   a ,  41   a.    
     The ergonomic shape of the handle  1 , the dimensioning of the tab  23 , in particular in terms of resilience/stiffness, and the optional audible effect of the locking means  40  all have an influence on the perception of the user while actuating the device of the invention, and thus on the user&#39;s control over the tension force in the cable. 
     An advantageous aspect of the invention also consists in monitoring the angular position between the two moving parts  20  and  30 . To do this, marker means may be provided. The marker means may operate visually. 
     Thus, as shown in  FIG. 1 , the first moving part  20  has a plurality of patterns disposed on a circular arc substantially centered on the transverse pin  50 . These patterns are masked by the second moving part  30  with the exception of one pattern that can be seen through an opening  36   a  provided for this purpose in the second moving part  30 . When the device is actuated, the moving parts pivot relative to each other so the opening  36   a  of the second moving part  30  shifts relative to the first moving part  20 , thus allowing a new pattern on said first moving part  20  to appear. Consequently, the pattern that is visible is a function of the angular position between the two moving parts. It is possible to use a green spot when the motor and gearbox unit is released and a red spot when it is engaged. Other marker means could be used, in particular an oblong opening  36   a  with marking in the form of a graduated scale on the first moving part  20 . The same marker means could also be provided on the other side of the device. 
     In a variant, an additional locking mechanism may be provided to reinforce the safety of the device. This mechanism consists in blocking the degree of freedom between the two moving parts  20  and  30 . The mechanism may be a pin (not shown) that is inserted in the opening  36   a  and that passes through both moving parts  20  and  30 . The first moving part  20  then has at least two through holes, of axis substantially perpendicular to the actuation direction Fa, and disposed in such a manner that when the device is in the “engaged” or the “release” position (i.e. when the release member actuated by the device is in the corresponding state), one of the through hole axes lies on the axis of the hole constituting the opening  36   a . Preferably, the second moving part  30  has two openings  36   a  and  36   b  on a common axis that are disposed symmetrically on either side of the first moving part  20 . Thus, the additional locking is obtained when the pin passes through these two openings and the through hole.