FR2721972A1 - LOCKING DEVICE FOR ROLLING SHUTTER - Google Patents

Abstract

The lock consists of a pivoted and spring-loaded catch (16) in each of the slat guide channels (11,12) which engages with an aperture (17) in the end of a slat (4). The catch is located in the middle of the guide channel, and the slat with the aperture to engage with it is located in the middle of the blind when it is in its fully down position. The catch is in the form of a lever and is spring-loaded by elastic strips (23,24) which cause the catch to press against the blind as it comes down and retract as it is raised.

Description

The invention relates to a locking device for a roller shutter.

  comprising an apron winding on and unwinding from a support shaft and composed of a juxtaposition of blades, in particular articulated with respect to each other and the ends of which move in lateral slides. The present invention will find its application in the field of building carpentry and very particularly in that of closings of the

roller shutter type.

  Generally, a rolling shutter usually consists of a support shaft on which and from which a deck is rolled up and unrolled

  under the action of drive means, either manual or motorized.

  This tree is often housed in a box surmounting the opening which should be closed by means of said roller shutter. As for the deck, it is composed of a juxtaposition of blades connected to each other by means of articulation means which, moreover, are often telescopic. Thus, these blades, not only, are able to pivot with respect to each other, but, moreover, move in a direction perpendicular to their longitudinal axis. Thus, it is possible to obtain either a total concealment using the apron when the blades are held contiguous or, on the contrary, an openwork position in whole or in part, all the blades or only some of them being, under these conditions, kept apart from each other revealing days. During deployment or folding of the deck, the blades are guided in their movement, up to their end, using

side slides.

  These blades, particularly when they are made of synthetic material of the PVC type, have a certain flexibility, so that under the impulse of a force exerted perpendicularly on the apron in the deployed position, the latter deforms forming a belly . This deformation is all the more important as the pressure exerted on this deck is great,

  of course, but it is also proportional to the width of said deck.

  Thus, in the context of aprons of relatively large width and under the influence of a more or less powerful wind, the deformations of the apron can be such that the ends of the blades can be released from their slides. The same result is of course obtained under the influence of a

  voluntary push corresponding, for example, to the actions of a sour

  late attempting to break into a building.

  Finally, to reduce the risk of these blades coming off their slides, the width of the latter has simply been increased and determined according to the width of the deck so as to take advantage of a length of engagement of the lateral ends of a blade behind the scenes

which is sufficient.

  It is obvious that this solution is not acceptable insofar as it does not answer the problem of the deformation of the apron and that it requires the use of slides whose width is adapted to that of the roller shutter which imposes a cumbersome management of the production and storage of these slides without counting, that wide slides are

  often considered unsightly.

  It is to all of these drawbacks that the present invention has been able to provide a solution insofar as it responds to the problem of the deformation of the deck, the latter being considerably limited, so that

  the side rails are able to keep a standard width.

  To this end, the invention relates to a locking device for a roller shutter comprising an apron which is wound on and takes place from a support shaft and composed of a juxtaposition of blades, in particular articulated with respect to each other, and the ends move in lateral slides, characterized in that it comprises at least one locking member, is arranged in each of the lateral slides so that at the passage of at least one determined blade in front of these locking members , these are able to cooperate with the ends of this blade, or, conversely, equipping each of the ends with one or more blades and coming to cooperate with retaining means associated with the lateral slides, this to limit the bending of the or the blades concerned and prevent its or their ends from coming off laterally from the slides

side.

  The advantages obtained thanks to this invention consist in that, by preventing, through the locking members, the deformation of even a single blade, for example disposed in a central zone of the deck, we reduce, so considerable, the deformations which the other blades can show and consequently, the deck under the influence of a thrust caused, either by the wind, or voluntarily. This means that the side rails can keep a standard width

  while being applied to large roller shutters.

  Advantageously, such a blocking device can constitute, easily, and under certain conditions, a locking member capable of preventing a direct intervention on the apron making it possible to repel the latter to

inside the box.

  Other objects and advantages of the present invention will become apparent from

  course of the description which follows relating to modes of

  realization which are given only by way of indicative and nonlimiting example.

  The understanding of this description will be facilitated by referring to

  attached drawings and in which: - Figure 1 is a partial schematic perspective view of a roller shutter capable of being fitted with a locking device according to the invention; - Figures 2 to 5 correspond to partial views, schematically and in section of a locking device according to a first embodiment and associated with a side slide, these figures illustrating the kinematics of the locking member from the moment o it is in the retracted position inside a housing provided for this purpose, until it engages in an opening in the lateral end of a blade; - Figure 6 is a schematic perspective view of the blade receiving the locking device in a configuration similar to that illustrated in Figure 4; - Figure 7 illustrates schematically and partially a section of slide with which is associated a locking device corresponding to the embodiment illustrated in Figures 1 to 6, this locking device receiving a manually controlled locking member having the function of maintain the locking member in its active position engaged in the opening of a blade and, thus, giving this locking member the locking function of the deck; - Figures 8 and 9 show the cooperation between the locking member and the manually controlled locking member in a schematic and perspective representation form; - Figure 10 is a partial schematic perspective view of a slide receiving control means with power take-off on the shaft to actuate the locking member capable of holding the locking member in the active position corresponding to the locking apron; - Figures l and 12 show the cooperation between the control means, the locking member and the locking member; FIG. 13 is a diagrammatic view of a rolling shutter, the apron of which deploys along a slide, a detail of the latter being shown in enlarged form so as to illustrate the locking member still erased in its housing, and the locking member pending along the internal wall of the slide; - Figure 14 shows the same detail in an enlarged manner as that shown in Figure 13 and illustrates schematically the engagement of the locking member in the opening of a blade, the control means being at l 'Approach to the locking member in order to push it towards the locking member; - Figure 15 is a view similar to Figure 13 o is shown in detail and enlarged, the simultaneous cooperation of the control means with the locking member and the latter with the locking member which, being thus maintained in its active position, prevents the apron from going up

  following a direct action on the latter.

  - Figure 16 illustrates schematically and partially a side slide equipped with a locking member corresponding to a second embodiment; - Figure 17 is a schematic and partial view of a blade end equipped with a locking member intended to cooperate with retaining means associated with a lateral slide; - Figure 18 illustrates, schematically, the intervention of the locking member on the retaining means associated with a side slide in the event of bending of the blade; - Figure 19 illustrates the position taken by the retaining lug of

  the blocking member when rolling up the apron.

  As shown in Figure 1, the present invention relates to the field of roller shutters. Thus, a roller shutter 1 usually comprises a support shaft 2 capable of being driven in rotation by means of manual or motorized maneuvering means, from or on this support shaft 2 unwinding or winding up an apron 3. This consists of a juxtaposition of blades 4, 5 connected together by means of articulation means 6, possibly telescopic $ making it possible to give this deck 3 a position in whole or in part openwork or, on the contrary, a position of total concealment. More precisely, during the deployment of the deck 3 and as long as the final strip 5 of the latter does not rest on the threshold bar 7 in the lower part 8 of the opening closed by the shutter, said strips 4, 5, due to their own weight, exert a traction on each other, maintaining them in a position apart so as to reveal openings 10 at their junctions 6. By cons. once said final 5 rests on the threshold bar 7, and if one continues the maneuver of unwinding of the deck 3, the different blades 4 come gradually to bear on each

  others and eliminating the openings 10.

  On either side of the opening corresponding, for example, to a door, window or the like, there are, in addition, side slides 11, 12, of approximate "U" section inside which come move the ends 13, 14 of the blades 4, 5. Usually, such lateral slides 11, 12 cooperate, at their upper part, with a box (not shown) accommodating the entire mechanism

  winding and unwinding of the deck 3.

  We now refer to Figures 1 to 6.

  The present invention advantageously relates to a blocking device 15 for a rolling shutter 1 of the type described above. This blocking device has in particular a function. when the deck 3 is deployed, to limit its deformations under the influence of a thrust which would be applied to it in a direction perpendicular to its plane. In fact, such a thrust exerted, for example, by a relatively violent wind or by a person trying to break into a house leads to the bending of the blades 4 and in certain cases, to the release of the ends 13, 14 of the either of these side slides

11, 12.

  As specified above, the locking device according to the invention has the function of limiting these deformations of the deck 3 and, consequently, of avoiding the consequences which have just been indicated. For this, it comprises at least one blocking member 16 arranged, according to a first conceivable embodiment, in each of the lateral slides 11, 12 and able to cooperate with the ends 13, 14 of at least one blade 4 of the apron 3. In fact, these ends 1: 3. 14 of the blade 4 are provided with an opening 17 in which such a locking member 16 can be positioned

  when said blade 4 passes in front of the latter.

  More precisely, by immobilizing, by means of such blocking members 16, the ends 13, 14 of a blade 4 at the level of the lateral slides 11, 12, the bending deformation of this blade 4 is necessarily limited, but also that of the following and previous blades 4 because of their connection by means of articulation means 6. Consequently, given that in the event of a thrust exerted by the wind, the deck 3 tends to deform so important. often in its middle part, it is advantageous to arrange the locking members 16, substantially in the middle zone of the lateral slides 11, 12, the present invention not, however, being limited to such an arrangement. In addition, the blade 4 equipped with openings 17 intended to cooperate with these locking members 16 is, preferably, that coming to be positioned at the right of said members of

  blocking 16 when the deck 3 is closed and in the total concealment position.

  In fact, the blade 4 concerned is the one which is positioned at the right of the

  locking members 16 when all the other blades 4, 5, arranged in

  below are held contiguous against each other.

  Figures 2 to 6 illustrate a preferred embodiment of such a

  locking device according to the first embodiment of the invention.

  In this case, the locking member 16 is in the form of a lever 18.

  This is mounted tilting around an axis 19 parallel to the axis of the blades 4, 5 of the deck 3, this inside a housing 20 affixed, preferably, on the rear wall 21, oriented, in the direction of the house, of a side slide 11. 12. This arrangement on the rear wall 21 of the side slide 11, 12 is, of course, preferred for safety reasons and, therefore, of inaccessibility from the outside , but, here again, an arrangement on the outer wall 21A is conceivable without departing from the spirit of the present invention. This lever 18 is thus able to tilt inside the lateral slide 11, 12 through an opening 22 giving access to the interior of said housing 20. As visible in FIG. 2, this lever 18 is subjected to first elastic return means 23, in the form of a leaf spring, ensuring its automatic return to the retracted position inside the housing 20 in the absence of

  blades 4, 5 of the deck 3 in front of the locking member 16.

  On the other hand, as visible in FIG. 3, when the final blade 5 of the deck 3 passes, second elastic return means 24, with a stiffness coefficient greater than the first elastic return means 23, cooperate with said final blade 5, then with the following blades 4. They are thus placed under stress in order to tilt the lever 18 in an active position, in the direction of the internal part of the lateral slide 11, 12. Thus, under the action of these second elastic return means 24, the lever 18 comes to bear on the rear wall of the blades 4, 5, of the apron 3 until there comes up, at the right of this lever 18, an opening 17 arranged at the level of a well-defined blade 4. This is particularly visible in the

figure 4.

  Note that Figure 6 corresponds to a situation similar to that shown in Figure 4. We can see, in particular, the opening 17 in the end of a blade 4, this opening 17 being adjusted to the section of the lever 18 in order to obtain the desired result, namely maintaining an end 13, 14 of a blade 4 inside a lateral slide 11, 12 and, consequently, limiting the deformation of the deck 3 preventing bending of a blade 4 by

  through said blocking members 16.

  Such a locking device 15 corresponding to the embodiment described above can advantageously constitute locking means capable of preventing the lifting of the deck 3 by an action

direct on the latter.

  More precisely by immobilizing the locking member 16, in its position illustrated in FIG. 5, it is obvious that the blades 4, 5 of the deck 3, extending under these locking members 16, no longer have any relative mobility relative to each other, since, in this position, they are held contiguous. Consequently, the deck 3 cannot be pushed back from the bottom inside the box containing the drive mechanism. Finally, such a blocking device 15 can thus replace, advantageously, the anti-lifting devices that are usually found in the upper part of the deck, and serving

  of connection between the latter and the support shaft 2.

  Figures 7 to 9 illustrate such a blocking device 15 serving as manually controlled locking means. More specifically, in this case, the housing 20 associated with a lateral slide 11, 12 and containing the lever 18, also receives a locking member 25. This is in the form of a latch 26 provided with 'a hook 27 which can be hung on the lever 18 when the latter is in the active position as shown in Figure 5. Ultimately, a control lever 28 external to the housing 20 ensures the tilting of the latch 26 for lock the blocking member 16 in its active position or, on the contrary, to ensure unlocking and finally authorize the up or down control of the deck 3. In the context of FIGS. 10 to 12, it is illustrated control means 29 with power take-off on the axis of the support shaft 2 for actuating the locking member 25A capable of immobilizing the locking member 16

in its active position.

  In fact, it is a question here of automating the locking function conferred on the locking device according to the invention, so that, once the shutter is closed, the user is assured that the curtain 3 cannot be maneuver

from the outside.

  More specifically, these control means 29 comprise, first of all, a slide 30 capable of moving inside a lateral slide 11, 12 under the impulse of transmission means 31. These are, for example, constituted by a cable 32 describing a looped circuit coming from being wound up, partially. on the one hand around a drive pulley 33 disposed on the axis 34 of the support shaft 2 and, on the other hand, around a return pulley 35 placed inside a lateral slide 11, 12. Incidentally a cable guide 36 can be placed at the upper end of such a lateral slide 11, 12 in order to guide the cables from the support shaft 2 in the direction of the internal part of such a lateral slide 11, 12. Thus, during the rotation control of the support shaft 2, corresponding to the deployment of the deck 3, the slider 30, integral with the transmission means 31, comes to move inside a lateral slide 11, 12. Once the apron 3 is deployed so that the locking members 16 cooperate with the openings 17 of a blade 4 and, therefore, in the final phase of deployment of this apron 3, the slide 30 meets the member locking 25A in the form of a latch 26A mounted tilting inside a lateral slide 1 1, 12. This slide 30 then pushes said latch 26A and, therefore, its hook 27A above the lever 18 in order to immobilize

the latter in its active position.

  It should be observed that according to the embodiment illustrated in the accompanying drawings, the slide 30 moves along the wall constituting the bottom 37 of the side slide 11, 12 while the locking member 25A is mounted on the front wall 21A or the rear wall 21 of said lateral slide 11. 12, this around an axis 38 perpendicular to the plane of the shutter 1. In addition. the slide 30 has a bevelled part 39 which is intended to cooperate with a tapered end 40 corresponding to the latch 26A so as to obtain a progressive control of the latter. Note, also, that the center of gravity of the latch 26A is substantially offset from its pivot axis on the front wall 21A or the rear wall 21 of a side slide 11, 12, so that, when ordered up the deck 3 and therefore the slide 30, this latch 26A rocks under its own weight by releasing the locking member 16. Figures 13 to 15 are attached to an embodiment involving control means 41 to grip movement on the deck 3 to actuate the locking member 25B to immobilize the locking member 16 in its active position. More specifically, such power take-off control means on the deck 41 also include a slide 30B which. under the action of a rod 42, moves on the internal side of the front wall 21A of a lateral slide 11, 12. This slide 30B again has a beveled end 43 capable of cooperating with a tapered end 44 latch 26B corresponding to the locking member 25B. In this case, this latch 26B, pivotally mounted about a horizontal axis on the internal side of the front wall 21A of a lateral slide 11, 12, is subjected to elastic return means 45 allowing it to

  step aside in front of the blocking member 16 when the slide 30B is removed.

  As for the latter's power take-off on the bulkhead 3, it is effected by means of a bracket 46 terminating the rod 42 at its upper end, said bracket 46 resting, by means of its horizontal branch 47 on the part of the deck 3 still wound around the support shaft 2. Ultimately, when the deck 3 is deployed, the section formed by the deck-shaft assembly 2 tends to decrease. This movement is accompanied, via the bracket 46, by the rod 42 which pushes, progressively and downward, the slider 30B. Once the apron 3 is fully unwound, therefore corresponding to the closing of the shutter, the bracket 46 and the rod 42 are in their maximum lowered position. Under these conditions, the slider 30B is engaged at the rear of the locking member 25 by pushing it in the direction of the locking member 16 which is thus immobilized in the active position preventing any

reassembly of the deck 3.

  In the opposite direction, corresponding to the command to raise said apron 3, the blades 4 located above the locking members 16 gradually move away from one another. Simultaneously, the first blades of this deck 3 wind around the support shaft 2 resulting in an increase in the section of the latter. It then takes place, the upward control of the rod 42 and therefore of the slider 30B. The latter thus releases the latch 26B which, under the action of elastic return means 45, returns to its erased position against the internal side of the front wall 21A corresponding to a slide 11, 12. By continuing the upward movement of the apron 3, the blocking member 16 gradually tilts in the direction of the housing 20 which serves as its housing, emerging from the opening 17 corresponding to a blade 4 and in which it was

previously engaged.

  Finally, it should be observed that while remaining in the spirit of the present invention, it is perfectly possible to envisage conferring on the

  this locking device the only door lock function 3.

  Under these conditions, the openings 17 arranged in the blade 4 and intended to receive a blocking member 16 may simply be in the form of a cutout machined in the ends 13, 14 of a blade 4, or else of means d '' any hooking insofar as o

  these can cooperate with the locking members 16.

  Furthermore, in this simple locking function, the blocking device may comprise only a single blocking member 16 associated with a single lateral slide 11, 12 knowing, however, that a blocking member 16 disposed in each of the slides side 11, 12 naturally provides a better result. However, such blocking members 16 arranged in each of the lateral slides 11, 2 are not obliged, here, to cooperate

with the same blade 4.

  In fact, all these limitations are mainly necessary when this blocking device fulfills the function of limiting deformation of the

  deck under the impulse of a perpendicular thrust.

  As for FIG. 16, it illustrates the embodiment of a blocking device which, although not capable of ensuring a locking function, provides an astonishing result in terms of limitation of deformation of the deck under the impulse d 'such a thrust applied perpendicularly. ll More specifically, in this case, the blocking member 16A corresponding to this blocking device 15 is in the form of an elastic blade 48 projecting inside a lateral slide 11, 12, or side of the rear wall 21, ie at the level of the front wall 21A, this while being arranged parallel to the direction of movement of the apron 3. This elastic blade 48 furthermore has its ends 49, 50 bent in the direction of a same rear wall 21 or front 21A of said lateral slide 11, 12 so as to obtain progressive access 51 and clearance 52 slopes avoiding hindering the progression of the blades 4, 5 inside these lateral slides 11, 12 whether when ordering

  when deploying or folding the apron 3.

  Thus, several blades 4 of the deck 3 can be equipped, at their ends 13, 14, with opening 17 capable of cooperating with such a locking member 16A. In particular, may be equipped with openings 17, on the one hand, the blade 4 coming to be located at the right of these locking members 16A when the deck 3 is in the position of total obscuration and, on the other hand 4 positioned in front of said blocking members 16A when the deck 3 is on the contrary in a fully open position. One can also consider equipping a lateral slide 11, 12 with several blocking members 16A even able to cooperate, each with openings 17 arranged at the level of well-defined blades 4. It is thus possible to consolidate an apron 3 not only in its middle part, but, substantially, over its entire height. This may be necessary in the case of large roller shutters fitted, for example, with slats

made of relatively flexible PVC.

  Figures 17 to 19 of the attached drawings apply to a corresponding design. noticeably. to a kinematic inversion of

  embodiments described above.

  Thus, according to this second embodiment of the invention, the locking device 15, having the function of limiting the deformations of the deck 3 when the latter is deployed, consists of at least one locking member 16B fitted to each of the ends 13, 14 of one or more blades 4, 5, these locking members 16B being able to cooperate with retaining means 53 associated with the lateral slides 11, 12, in order to limit the bending of the blade (s) 4, 5. concerned and in order to prevent the ends 13, 14 of this or these latter, from coming off, laterally,

  said lateral slides 11, 12.

  Preferably, a blocking member 16B is in the form of a retaining lug 54 projecting from the external wall 55 and / or internal 56 of a blade 4, 5, this, precisely, at the level of the ends 13, 14 of the latter. As for the retaining means 53, they consist of a flange 57, 58 equipping, as the case may be, the free end of the external wall 21A and / or the rear wall 21 of a slide 11, 12. This or these flanges 57, 58, constitute, in a way, a constriction through which a blade 4, 5 precisely. fitted with a protruding retaining lug 54, cannot be removed. Substantially. the flanges 57, 58 are defined by the "T" grooves usually fitted to these free ends of the rear 21 and external 21A walls, this on the side internal to the slide 11, 12 and serving to receive a seal 60. Note that these flanges 57, 58 can be defined by other means and in particular by a simple seal attached by gluing or the like at the free end of the

  external wall 21A and / or the rear wall 21 of a slide 11, 12.

  The fact that the retaining lug (s) 54 are projecting from the external and or internal wall 55, 56 of one or more blades 4, 5, can hinder the normal winding of the deck 3 on the support shaft 2. Also, the retaining lug (s) 54 are subjected to elastic return means in projecting position 61 which, moreover, allow the erasure of these retaining lugs 54 in an opening 62 present for this purpose at

  level of the ends 13, 14 of the blade or blades 4, 5, concerned.

  As illustrated in FIGS. 17 to 19 of the attached drawings, said elastic return means 61 are, here, in the form of an elastic U-shaped blade 63 capable of being inserted into the thickness d 'a blade 4, 5 between the outer wall 55 and the inner wall 56 of the latter. As for the retaining lug 54, it is defined by a square wing 64 at one end of this blade 63 so that said square wing 64 emerges, either from the external wall 55 or internal 56 of a blade 4, 5, through an opening 62. Note that, in the same way, the two ends of the blade 63 can be equipped with a square wing 64 in order to define two retaining lugs 54 having projecting through openings 62 arranged, respectively, in the outer wall 55 and inner 56 of a blade 4, 5. Thus, when winding the deck 3, each of these lugs

  retainer 54 can disappear in the thickness of the blade 4, 5.

  Of course, the elastic return means 61 can take many other configurations which, moreover, are within the reach of those skilled in the art. Thus, they can, for example, be defined by a curved elastic blade which, for its engagement in the thickness of a blade 4, 5 of the deck 3, must be substantially straightened so that it is kept under stress and repels , resiliently, the retaining lug 54 in the projecting position. The advantages of such an embodiment consist in that the number of blades 4, 5, capable of being equipped with locking members 16B is indifferent. In addition, such blocking members 16B associated with the blades 4, 5 are operational at any time, whether the deck 3 is partially or fully deployed. Another advantage of this design is its

reduced cost price.

  The advantages of the present invention are obvious. Indeed, the blocking device, as described above, responds adequately to the problem of the deformability of a roller shutter curtain under the impulse of a pressure applied perpendicularly. he can

  still solve the various locking problems of said deck.

  Finally, its simplicity makes it possible to envisage equipping, also, such

  already existing rolling shutter locking devices.

  Although the invention has been described in connection with a particular embodiment, it is understood that it is in no way limited thereto and that it is possible to make various modifications to it. of materials and combinations of these various elements, without departing from the framework and

the spirit of the invention.

Claims (20)

Claims   1. Locking device for rolling shutter (1) comprising an apron (3) which is wound on and takes place from a support shaft (2) and composed of a juxtaposition of blades (4, 5), in particular articulated by relative to the others and whose ends (13, 14) move in lateral slides (11. 12), characterized in that it comprises at least one locking member (16; 16A) disposed in each of the lateral slides ( 11, 12) so that at the passage of at least one blade (4, 5) determined in front of these locking members (16; 16A), these are able to cooperate with the ends (13, 14 ) of this blade (4, 5), this to limit the bending of the latter and prevent its ends (13. 14) from being released laterally from the side slides (11, 12).   2. Locking device according to claim 1, characterized in that the blade (4) intended to cooperate with the locking members (16; 16A), comprises, at its ends (13, 14), openings ( 17) in   which are able to engage said locking members (16; 16A).   3. Locking device according to any one of claims 1 and   2, characterized in that the locking members (16) are preferably arranged in a central region of the lateral slides (11, 12).   4. Locking device according to any one of claims i to 3,   characterized by the fact that the blade (4) intended to cooperate with the locking members (16), is preferably that which comes to be positioned in line with the latter when the apron (3) is closed and in the total concealment position . 5. Locking device according to claim 1, characterized in that a blocking member (16) is in the form of a lever (18) mounted pivoting about an axis (19), parallel to the axis blades (4, 5) of the deck (3), inside a housing (20) affixed to the rear wall (21) or the front wall (21A) of a lateral slide (il, 12), this lever (18) being capable of tilting inside said lateral slide (11, 12) through a   opening (22) giving access to the interior of said housing (20).   6. Locking device according to claim 5, characterized in that the lever (18), constituting a locking member (16), is subjected to first elastic return means (23) ensuring its automatic return in   position cleared inside the housing (20) in the absence of blades (4, 5) at the   in front of such a locking member (16) and, on the other hand, to second elastic return means (24), of stiffness coefficient greater than the first elastic return means (23), these second elastic return means (24) being forced under the passage of the blades (4, 5) in front of the locking member (16) in order to control the tilting of the lever (18) in an active position, in the direction of the internal part of the lateral slide (11, 12).   7. Locking device according to any one of claims 2 to 6,   characterized in that it constitutes locking means capable of preventing the lifting of the bulkhead (3), and that it comprises a locking member (25; 25A; 25B) with manual or automatic control means, with   even to cooperate with a blocking member (16) in order to immobilize it   ci in active position, engaged in an opening (17) of a blade (4) of the apron (3).   8. Locking device according to claims 5 and 7, characterized by   the fact that the locking member (25) is in the form of a latch (26) disposed in the housing (20) receiving the lever (18) constituting the locking member (16), this latch (26) , provided with a hook (27), being operated by means of a control handle (28) external to the housing (20) in order to make it cooperate with the lever (18) to immobilize this one in active position.   9. Locking device according to claims 5 and 7, characterized by   the fact that the locking member (25A) is actuated by means of control means (29) with power take-off on the axis of the support shaft (2).   10. Locking device according to claim 9, characterized in that the control means (29) with movement on the axis of the support shaft (2) comprise a slide (30) capable of moving at the inside a lateral slide (11, 12) under the impulse of transmission means (31), this slide (30) being able to push the locking member (25A), in the form of a latch ( 26A), above the lever (18) in order to immobilize the latter once in its active position and engaged in an opening (17) of a blade (4).   11. Locking device according to claims 5 and 7, characterized by   the fact that it comprises control means (41) with power take-off on the bulkhead (3) for actuating the locking member (25B) in view   to immobilize the blocking member (16) in its active position.   12. Locking device according to claim 11, characterized in that the control means (41) with power take-off on the bulkhead (3) comprise a bracket (46) resting, by means of a horizontal branch ( 47), on the part of the deck (3) still wound on the support shaft (2), this bracket (46) being integral with the upper end of a rod (42) extending inside of a lateral slide (11, 12) and actuating a slide (30B) capable of acting on the latch (26B) constituting the locking member (25B) to bring this latch (26B) in cooperation with the lever (18) and immobilize it in the active position,   engaged in an opening (17) of a blade (4).   13. Locking device according to any one of claims 8, 10   and 12, characterized in that the latch (26, 26A, 26B) constituting the locking member (25, 25A, 25B) is subjected to return means in position cleared.   14. Locking device according to claim 1, characterized in that the locking member (16A) is constituted by an elastic blade (48) projecting inside a lateral slide (11, 12), either on the side of the rear wall (21), ie at the level of the front wall (21A), while being arranged parallel to the direction of movement of the deck (3), this elastic blade (48) further comprising at its ends (49, 50) a gradual access (51) and clearance (52) slope to facilitate progression   blades (4, 5) inside said lateral slides (11, 12).   15. Locking device according to claim 14, characterized in that a lateral slide (11, 12) comprises, distributed over its height, several locking members (16A) in the form of elastic blades (48) and / or that several blades (4) of the deck (3) have, at the level of their ends (13, 14), openings (17) capable of accommodating an organ blocking device (16A).   16. Locking device for a roller shutter comprising an apron (3) which is wound on and takes place from a support shaft (2) and composed of a juxtaposition of blades (4, 5), in particular articulated with respect to each other and whose ends (13, 14) move in lateral slides (11, 12), characterized in that it comprises at least one locking member (16) disposed in at least one lateral slide (11, 12) and that at least the blade (4), coming to be positioned in front of this blocking member (16) when the deck (3) is in the closed position and completely concealed, has an opening or a cutout (17) even receiving said locking member (16), the latter being able to be immobilized in this active position by means of a locking member (25; 25A; 25B) actuated by manual control means or by automatic control means, of the control means type (29) with power take-off on the axis d e the support shaft (2) or control means (41) to   power take-off on the bulkhead (3).   17. Locking device for a roller shutter comprising an apron (3) which is wound on and takes place from a support shaft (2) and composed of a juxtaposition of blades (4, 5), in particular articulated with respect to each other and whose ends (13, 14) move in lateral slides (11, 12), characterized in that it comprises at least one locking member (16B) equipping each of the ends (13, 14) with a or several blades (4, 5) and coming to cooperate with retaining means (53) associated with the lateral slides (11, 12), this to limit the bending of the blade (s) (4, 5) concerned and prevent these or their ends (13, 14) of   laterally release the lateral slides (11, 12).   18. Locking device according to claim 17, characterized in that a blocking member (16B) is in the form of a retaining lug (54) projecting from the external wall (55) and / or internal (56) of a blade (4, 5), this at the ends (13, 14) of the latter, the retaining means (53) associated with the lateral slides (11, 12) being constituted by a flange (57 , 58) equipping the free end of the external wall (21A) and / or the rear wall (21) with a slide (11, 12) in order to create, at the level of the latter, a constriction through which a blade (4, 5), fitted with at least one projecting retaining lug (54) cannot be extracted. 19. Locking device according to claim 18, characterized in that the retaining lug (s) (54) are subjected to elastic return means in projecting position (61) in order to allow the erasure of this   or of these retaining lugs (54) in the thickness of a blade (4, 5).   20. Locking device according to claim 19, characterized in that said elastic return means (61) are in the form of an elastic blade folded in a "U" shape (63) capable of being inserted into the thickness a blade (4, 5), between the outer wall (55) and the inner wall (56) of the latter, the retaining lug (54) being defined by an end folded in a square (64) of this blade (63) so that said folded end (64) emerges either from the external (55) or internal (56) wall of a blade   (4, 5), through an appropriate opening (62).