Abstract:
Disclosed is a device ( 30 ) for manually controlling the position of switching means which have two extreme positions A and C and an intermediate position B. Said device comprises a crank ( 5 ) and a crankpin ( 6 ). The invention is characterized by the fact that the device comprises a translationally movable sliding member ( 1 ) that has a neutral position and is provided with guideways ( 20, 21 ), within which the crankpin ( 6 ) is displaced. Said guideways allow the crankpin to be guided towards three areas of the sliding member, in which the position thereof is stable and which correspond to the three positions of the switching means, when the sliding member is moved towards the neutral position. The inventive device has the advantage of being simple while allowing a change in the state of the motor which operates the closing element, darkening element, or sun-shading element, or sun-shading element to be controlled by means of a single movement of a rod ( 14 ).

Description:
BACKGROUND OF THE INVENTION  
       [0001]     The present invention relates to a device for manual control of the position of switching means for the electrical powering of a motor for operating a closure, privacy or sun-protection element. It relates in particular to a device according to the preamble of claim  1  and to a process for control of a motor operated by means of such a process.  
         [0002]     Two positions of the switching means allow the motor to be powered in order to turn it in a first direction of rotation and in a second direction of rotation, respectively. The third position of the switching means is a position in which the motor is not powered.  
       DESCRIPTION OF THE PRIOR ART  
       [0003]     Patent application EP 0 936 342 discloses a control device comprising a switch controlling the power to a motor and means for actuating said switch. These actuating means consist of a bistable mechanical device that can occupy a first state in which the switch is closed and a second state in which the switch is open.  
         [0004]     The bistable mechanism consists of a cylindrical component that can move in translation and in rotation in a fixed cylindrical tubular component to which it is connected by means of the action of a stud of the moveable component over a ramp of the fixed component. The moveable component is pushed toward the switch by a spring and is connected to a pulling member, which can be actuated manually, allowing the moveable component to be displaced counter to the action of the spring. The device is brought into its first state by means of an action on the pulling member, and is brought into its second state either by means of a second action on the pulling member or by means of a load moment exerted on the motor, giving rise to a relative rotary movement between the moveable component and the fixed component.  
         [0005]     Similarly, application DE 26 22 229 discloses a bistable switch comprising a slider that can move in translation, in which a rod connected kinematically to electrical contacts is displaced.  
         [0006]     Patent FR 1 025 384, discloses a device for electrical control of a motor for operating shutters and doors, allowing powering of the motor in one direction or in the other by means of a manual action, and the automatic stopping of the motor when the shutter or the door reaches an end-of-travel point. This device comprises a rotary three-phase reversing switch that can be placed in three positions corresponding to powering of the motor in two directions and to stopping of the motor. The operations of placing in the powering positions are carried out by virtue of two cables that drive the shaft of the switch carrying the contacts in rotation. The operation of placing in the position of stopping the motor may be carried out by means of an action on the cables in order to bring the switch into its intermediate position. When the door or the shutter arrives at the end-of-travel point, cams interact with levers in order to bring the shaft of the switch carrying the contacts into its intermediate position.  
         [0007]     Furthermore, application FR 2 473 221 discloses a three-position electrical commutator comprising a slider that can move in translation in which a pin integral with a lever acting on electrical contacts is displaced. Successive actions on the slider move the commutator from a contact position into another position via a non-stable position in which there is no electrical contact.  
         [0008]     Such embodiments present disadvantages. The first-mentioned embodiments do not allow the door or the shutter to be set in motion in one direction and then in the other direction by means of a single manual action.  
         [0009]     The other embodiments allow this, but in one of the embodiments the actions have to be carried out on two different members, one allowing the rise and the other allowing the fall, and the architecture of this embodiment is complex, expensive and requires a great deal of space. Moreover, in the other embodiment, there is no intermediate position allowing stopping of the motorized element between the two contact positions.  
         [0010]     Patent application FR 2 813 456 discloses a device for manual control of an electric motor for a roller shutter. It includes a plate integral with an electric motor. This plate has two housings, one receiving a barrel and one receiving a switch. A rod connected to a ring and passing through the wall of the plate makes it possible to turn the barrel by virtue of a ratchet-wheel system. The rotary movement of the barrel is converted by a connecting-rod/crank system into a translational movement of a slide, entraining the switch. When the roller shutter arrives at the end-of-travel point, means make it possible to return the switch into a position of equilibrium in which the motor is not powered.  
         [0011]     This device presents drawbacks. Its numerous moving components make it complicated. Furthermore, when the shutter has arrived at the end-of-travel point, it is necessary to act twice on the rod in order to command it to displace itself in the opposite direction.  
       SUMMARY OF THE INVENTION  
       [0012]     An object of the invention is to produce a manual-control device that palliates these drawbacks and improves known, prior-art devices. In particular, the invention proposes to produce a simple device that makes it possible, by means of a single action on a rod, to command a change in the state of the motor operating the closure, privacy or sun-protection element. Moreover, the device has to allow cutting off of the power to the motor when the entrained element arrives at the end-of-travel point.  
         [0013]     The control device according to the invention is characterized by the characterizing part of claim  1 .  
         [0014]     Dependent claims  2  through  6  define embodiments of the device according to the invention.  
         [0015]     The process according to the invention is defined by claim  7 . 
     
    
     DESCRIPTION OF THE DRAWINGS  
       [0016]     By way of examples, the appended drawing shows two embodiments of the manual-control device according to the invention.  
         [0017]      FIG. 1  is a sectional view of a first embodiment of the manual-control device according to the invention.  
         [0018]      FIG. 2  is a sectional view in plane II-II of  FIG. 1  of this embodiment.  
         [0019]      FIG. 3  is a view similar to that of  FIG. 1 , the slider being shown in another position.  
         [0020]      FIG. 4  is a cross-sectional view of the switching means.  
         [0021]      FIGS. 5   a  through  5   l  are diagrammatic views of the control device according to the first embodiment, shown in successive positions of the slider.  
         [0022]      FIGS. 6 and 7  are sectional views of the control device according to a first variant of the first embodiment, the slider being shown in two positions.  
         [0023]      FIG. 8  is a sectional view of the control device according to a second variant of the first embodiment.  
         [0024]      FIG. 9  is a diagrammatic view of the control device according to this second variant.  
         [0025]      FIG. 10  is a diagrammatic view of the control device according to a third variant of the first embodiment.  
         [0026]      FIG. 11  is a front view of the slider of the control device according to a second embodiment.  
         [0027]      FIGS. 12 and 13  are partial sectional views in planes XII-XII and XIII-XIII of the slider of the control device according to the second embodiment.  
         [0028]      FIGS. 14   a  through  14   j  are diagrammatic views of the control device according to the second embodiment, shown in successive positions of the slider. 
     
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0029]     The control device, shown in  FIG. 1 , principally comprises a shaft  2  that can move in rotation in a bore  44  made in a structure  10  and connected in rotation at its end by a coupling  3  and  4  to a crank  5  ending in a crank pin  6  and a slider  1  that can move in translation in a sleeve  9  integral with the structure  10 . This control device allows electrical powering of a motor entraining a load such as a shutter, a door or any other element.  
         [0030]     The shaft  2  and the structure  10  interact in order to produce means for switching the current upon rotation of the shaft  2  in the structure  10 . As shown diagrammatically in  FIG. 4 , the shaft has terminals  45  along its longitudinal axis that are designed to come into contact with terminals  42  arranged axially in the bore  44 , or with terminals  43  arranged axially in the bore  44 , depending on the direction in which the shaft is turning. The position A, shown in  FIG. 4   a , in which the terminals  45  and  42  are in contact, allows closure of an electrical circuit so as to power the motor (not shown) in order to turn it in a first direction of rotation. The position C, shown in  FIG. 4   c , in which the terminals  45  and  43  are in contact, allows closure of an electrical circuit so as to power the motor in order to turn it in a second direction of rotation. The position B, shown in  FIG. 4   b , in which the contacts  45  are not in contact with any other, allows opening of the circuit powering the motor.  
         [0031]     The shaft  2  has, at one of its ends, a hollow hexagonal form  3  receiving a crank  5  provided with a male hexagonal form  4  and with a crank pin  6 . The shaft  2  and the crank  5  are connected in rotation by these complementary forms  3  and  4 .  
         [0032]     It is also possible for the shaft not to have any electrical contact and to consist of a simple transmission shaft, the purpose of which is to position a switch, for example a switch incorporated into the motor, as a function of the position of the crank pin  6  in the slider.  
         [0033]     The slider  1  is in a sliding relationship in the sleeve  9 . Its translation axis is perpendicular to the axis of rotation  7  of the shaft  2 . The slider  1  and the sleeve  9  have, respectively, a lug  12  and a lug  11 , each provided with a hole. The ends of a spring  8  allowing the slider  1  to be returned to the bottom of the sleeve  9  are articulated in these holes.  
         [0034]     The slider  1  has another lug  13  opposite the lug  12 . This lug  13 , also, is provided with a hole by means of which, as shown in  FIG. 3 , it is possible, by means of a rod  14 , to apply pulling forces to the slider  1  so as to displace it in translation counter to the action of the return spring  8 .  
         [0035]     The slider  1  is provided with tracks  20  and  21  in which the crank pin  6  is displaced. A leafspring  17  returns the slider  1  counter to the crank pin  6  so that the latter is permanently displaced to the bottom of the tracks  20  and  21 . These tracks  20  and  21  have different levels relative to the axis of rotation  7  of the shaft  2 .  
         [0036]     The crank pin  6  is able to move from the lower level, into which it is displaced in  FIG. 1 , to the upper level, into which it is displaced in  FIG. 3 , by virtue of a ramp  27 . In point of fact, when the crank pin is displaced in the lower track and arrives in contact with the ramp  27  by means of the displacement of the slider  1  through the effect of a pulling force on the rod  14 , the action of the crank pin  6  contacting on the slider  1  pushes the latter back counter to the action of the spring  17 . In this way, the crank pin  6  is able to scale the ramp  27 .  
         [0037]     The crank pin  6  is also able to move from the upper level, into which it is displaced in  FIG. 3 , to the lower level, into which it is displaced in  FIG. 1 , by virtue of the steps  24   a  and  24   b  shown in  FIG. 2 . In this case, it is the spring  17  that returns the slider  1  into a position in which the crank pin  6  is at the bottom of the track  21 .  
         [0038]     The slider  1  has a rocker  15  that can move in rotation about an axis parallel to the axis  7  of the shaft  2 . This rocker  15  has two symmetrical stable positions relative to the axis of translation of the slider  1 . It consists of two side arms and a central arm. As shown in  FIG. 2 , it allows the crank pin to be steered into the track A by virtue of the contact of the crank pin  6  on its central arm, and then it rocks into its other stable position when the crank pin  6  passes into the track A by means of contact of the crank pin  6  on its side arm closing off the track A. In this way, when the crank pin  6  next passes over the ramp  27 , said crank pin will be steered into the track B.  
         [0039]     The transverse displacements of the crank pin  6  in the tracks of the slider  1  give rise to rotations of the shaft  2  in the structure  10  so as to cause the motor to be powered in order to turn it in a first direction, or cause the motor to be powered in order to turn it in a second direction or to cause stopping of the motor. The slider comprises three zones a, b and c, shown in  FIG. 5   b  and in  FIG. 10 , in which the crank pin occupies a position such that the switching means are in extreme positions A, C or intermediate position B.  
         [0040]     Reference is now made to  FIGS. 5   a  through  5   l , which represent the path the crank pin  6  will follow at the time of three successive actions on the rod  14 .  
         [0041]     In  FIG. 5   a , the crank pin  6  is in its intermediate position B relative to its rocking movement about the axis  7  of the shaft  2 . This position corresponds to the stopping of the motor. In this position, a pulling force F is applied to the slider  1  via the rod  14 . This results in displacement of the slider  1  relative to the sleeve  9  and, consequently, the displacement of the crank pin  6  relative to the slider  1 .  
         [0042]     Through the action of this force F, the crank pin  6  passes over the ramp  27  and comes into contact with the central arm of the rocker  15 , as shown in  FIG. 5   b.    
         [0043]     Still through the action of the force F, as shown in  FIG. 5   c , the crank pin  6  is displaced along a ramp  22   a  and causes the rocker  15  to rock into its other position of equilibrium. Once the crank pin  6  has arrived at the end of the ramp  22   a , the pulling force F is stopped.  
         [0044]     As shown in  FIG. 5   d , the slider  1  is entrained by the spring  8  exerting a return force R and resulting in the crank pin  6  coming into contact with the ramp  23   a . The crank pin is displaced over this ramp  23   a  until it is located in the position shown in  FIG. 5   e.    
         [0045]     As the spring  8  is still applying a return force, the crank pin  6  is displaced, passing over the step  24   a  until it arrives in the stable position shown in  FIG. 5   f.    
         [0046]     In this position, the motor is powered and rotates in a first direction of rotation. When it is desired to stop the motor, a pulling force F is again applied to the rod  14 , as shown in  FIG. 5   g . The crank pin  6  then comes into contact against the step  24   a  and is displaced against the latter and then against the ramp  25   a  as far as its end, as shown in  FIG. 5   h . This step constitutes a means that makes it possible to permanently divert the crank pin steering toward the track above the step.  
         [0047]     At this time, the pulling force is stopped, and through the effect of the return force R the crank pin comes into contact with the ramp  26   a  and is displaced along the latter, as shown in  FIG. 5   i.    
         [0048]     Having arrived at the end of this ramp  26   a , the crank pin  6  is located in its stable position of  FIG. 5   a . In this position, the motor is not powered.  
         [0049]     When a new pulling force F is applied to the slider  1  by means of the rod  14 , the crank pin  6  again passes over the ramp  27  and comes into contact with the central arm of the rocker  15 , as shown in  FIG. 5   k . At this time, the crank pin  6  will follow a path that is symmetrical, relative to the axis of sliding of the slider, to the path described for  FIGS. 5   a  through  5   j , resulting in different powering of the motor so as to turn it in a second direction of rotation.  
         [0050]     When the element entrained by the motor arrives at the end-of-travel point or at an obstacle, means known to a person skilled in the art make it possible to position the switching means in their “stop-motor” state. This is achieved by means of a rotation of the switching means about the axis  7  of the shaft  2  and results in the displacement of the crank pin  6  in the slider  1 , as shown in  FIG. 5   l . The slider is consequently provided with a track  103  having substantially the shape of an arc of a circle, passing via the three stable positions of the crank pin in the slider. The crank pin is then located in a stable position, shown in  FIG. 5   j.    
         [0051]     In this embodiment, the tracks define three stable positions that may be occupied by the crank pin when the slider is returned toward its position of rest and that correspond to the three positions of the switching means. These tracks have substantially the form of inverted Vs: a first wing  100  of the V serving to displace the crank pin transversely relative to the slider when the latter is displaced in a first direction, and the second wing  101  serving to displace the crank pin transversely relative to the slider in the same direction when it is displaced in the other direction.  
         [0052]     According to the nature of the switching means and, in particular, as a function of their ability to remain stable in a position into which they have been brought, the ends of these tracks may or may not have means for holding the crank pin in position at the end of the track. These means may, for example, consist of dishes  102 , such as those shown in  FIG. 10 . The crank pin comes to be positioned in said dishes when it arrives at the end of the track.  
         [0053]     The slider could also be returned into its position of rest by forces other than that of an elastic element. In particular, it could be returned under its own weight or by means of an action on the part of the user via the rod.  
         [0054]     A first variant of this embodiment is shown in  FIGS. 6 and 7 . The control device  40  shown in these figures differs from the device described above in that the slider  1  is not returned into contact with the crank pin. In fact, in this case, it is the crank  41  that is formed from elastic leaves allowing the crank pin  6  to be returned to the bottom of the tracks of the slider  1 .  
         [0055]     A second variant of this embodiment is shown in  FIGS. 8 and 9 . The control device  50  shown in these figures differs from the devices described above in that the tracks  52  of the slider  1  have only one level. Consequently, means for returning the crank pin  6  and the tracks  52  relative to one another are no longer necessary.  
         [0056]     However, flaps  51   a  and  51   b  articulated about horizontal axes and consisting of tabs produced from an elastic material are added into the tracks  52 . They are designed to replace the steps  24   a  and  24   b  of the devices described above. In effect, these flaps  51   a  and  51   b  allow the displacement of the crank pin in only one direction in the two vertical side channels of the slider  1  shown in  FIG. 9 . It should be noted that the tabs may also be articulated about axes parallel to the bottom of the tracks  52 . These tabs constitute means that make it possible to permanently divert the crank pin steering toward the tracks located above the tabs.  
         [0057]     A third variant of this embodiment is shown in  FIG. 10 . The slider  1  of the control device shown in this figure differs from the slider described above in that it has no flap. However, it has ramps  75   a  and  75   b  that make it possible, after having applied a force to the slider  1 , to bring the crank pin  6  into a stable position such that when there is further action on the slider  1  the crank pin  6  comes into contact with one of the ramps  76   a  or  76   b  and then into contact with one of the ramps  77   a  or  77   b  so as to bring it into its stable position corresponding to the stopping of the motor.  
         [0058]     When the crank pin  6  is in its stable position allowing powering of the motor and the element entrained by the motor arrives at the end-of-travel point, the switching means are brought into their “stop-motor” position, and the crank pin  6  acts on the ramp  78   a  or on the ramp  78   b  and displaces the slider  1  counter to the action of the return spring  8  in order to escape from its “power-motor” position of equilibrium.  
         [0059]     The slider  61  and the crank pin  70  of a second embodiment are shown in FIGS.  11  to  13 . This crank pin  70  differs from the crank pin of the devices described above in that it has a shoulder  71 . The slider  61  differs from the sliders described above in that the tracks have three levels: a track  62  at a lower level, two tracks  63  and  64  at an upper level, and a track  65  at an intermediate level. The slider  61  has a ramp  66  allowing the crank pin  70  to move from the track  62  to the track  63 , and a ramp  67  allowing the crank pin  70  to move from the track  65  to the track  64 . The slider  61  has a step  68  allowing the crank pin to move from the track  63  to the track  65 , and a step  69  allowing the crank pin  70  to move from the track  64  to the track  62 .  
         [0060]     The operating principle of a device of this type is explained with reference to diagrams  14   a  through  14   i.    
         [0061]     In  FIG. 14   a , the crank pin  70  is in contact with the track  65 . After action on the slider  61 , it is displaced and passes over the ramp  67 , and is displaced transversely until it arrives in the position shown in  FIG. 14   c , in which the motor is powered in order to turn in a first direction of rotation. The action of the return spring then brings the crank pin into a stable position shown in  FIG. 14   d.    
         [0062]     A further action on the slider  61  allows the crank pin  70  to be brought into a position of equilibrium, shown in  FIG. 14   h , in which the motor is not powered. The crank pin is then in contact with the track  62 . A further action on the slider  61  makes it possible, as shown in  FIG. 14   i , to steer the crank pin toward the ramp  66  and to displace the crank pin  70  transversely so as to power the motor in order for it to turn in a second direction of rotation.  
         [0063]     It should be noted that the shaft  2  that can move in rotation in the structure  10  may be stable in the three “power motor in a first direction”, “power motor in a second direction” and “stop-motor” positions. In such a case, when it is in a position in which the motor is powered, a force of the slider on the crank pin is necessary in order to rock it into the position in which the motor is stopped. In such a case, use may be made of a slider that is not returned into a position of rest. It is then necessary to effect a back-and-forth movement with the rod in order to change the position of the switch.