FR2835277A1 - ROLLER SHUTTER WITH MANEUVER BY STRAP WITH ANTI-LIFTING DEVICE - Google Patents

Abstract

Roller shutter capable of being associated with an opening comprising a vertical component, comprising: - an apron (1) with articulated blades capable of winding and unwinding, - a winding shaft (2) defined along a first axis (3 ), - means (4) for connecting a primary blade (5) of the deck with the winding shaft, - drive means (6) for rotating the winding shaft comprising a strap for unwinding and wind the apron between two positions, a lowered position to close the opening and a raised position to leave the opening free, - means (9, 53) for locking the apron in the lowered position to prevent it, by a direct action on him, to bring it back to its raised position, and- means (29) for unlocking the apron to allow it to pass from a lowered position to a raised position, said means for locking the apron comprising cooperating means (20) with the winding shaft in order to prevent its rotation in the direction of winding of the deck, the means for unlocking the deck comprising means (30) cooperating with the means for driving the winding shaft in rotation to release the rotation of the latter.

Description

at least one wing (28, 31) of the second hinge element (22).

VOLETROULANTA MAN_UVREPARSANGLE

AVECDISPOSITIFANTI-LIFT

  The present invention relates to roller shutters with maneuver by strap which are OS capable of being associated with building openings or the like comprising a vertical component allowing gravity to act on the flight and rolling in order to train it.

lowered position.

  Such roller shutters do not normally have anti-lifting means, and when the roller shutter is lowered, a malicious person can raise the apron by acting directly on it and by lifting it by lifting in particular from the

final blade.

  There are, however, roller shutters with man_uvre by strap comprising anti-lift safety means. Such a rolling shutter essentially comprises: an apron with articulated blades capable of winding and unwinding, a winding arDre defined along a first axis, means for linking the primary blade of the apron, ie the blade upper part of the apron when it is unrolled, with the winding shaft, for example fasteners or the like, and means for driving in rotation by strap of the winding shaft to place the apron between two positions, a lowered position to close the opening and a raised position to leave this opening free. The course of the apron in the opening is effected by gravity when the operator acts on the strap to release the apron. The means for rotating the winding shaft comprises a pulley or the like secured to the winding shaft, a strap mounted in cooperation with the pulley so that, by a first tensile force exerted on the strap , the pulley is rotated in a first direction to tend to move the deck from its lowered position to its raised position and that, by a second pulling force on the strap opposite to the first, the pulley is able to be released rotating in the opposite direction to the first to tend to move the deck from its raised position

  to its gravity lowered position.

  Such anti-lifting means are already known. They are for example constituted by hooks or latches mounted in cooperation with a blade, for example the furthest from the winding shaft when the deck is in its lowered position or final blade, and accessible from the side of the flap which is turned towards the inside of the building which includes such a rolling shutter, or towards the side of the shutter which faces towards the outside of the building and in this case the means for blocking the apron are generally locks 3s with lock, these hooks or locks coming , by manual action, hook into notches or other suitable housings made in the uprights of the opening. Such means are very impractical to use, since they are in particular not actuated automatically and, if the users of the shutters forget to engage them, their function

  anti-lift mechanism lapses.

  I1 exi st other realizations of anti-lift availability which have been developed by the Applicant, in the specific cases of control of the shutter by winch or motor, which are described in particular in documents FR2789436, FR2789437. Such anti-lifting devices include connecting rods or the like which are mounted in co-operation with the primary blade, these are coming, when the deck is fully unwound in the opening, either in the lowered position, automatically blocking by arc -butt or similar, to thereby achieve a rigid connection between the winding shaft and the roller shutter in the lowered position in combination with the irreversible transmission of the rotational movement between the winch or the motor and the winding arDre. The shutter is thus locked automatically when it is lowered and arrives at the end of the unwinding, by the fact that the specific control by winch or motor ensures an irreversibility of the movement of the winding shaft, and do nc prevents this shaft to turn when the shutter is pressed directly. Such devices are not functional with an operating mechanism by means of rolling shutters, for which the rotation of the winding shaft is free in

both ways.

  The present invention proposes to overcome these drawbacks. More specifically, it relates to a rolling shutter capable of being associated with an opening comprising a vertical component, comprising: - an apron with articulated blades capable of winding and unwinding, - a winding shaft defined along a first axis , - means for connecting a primary blade of the apron with the winding arDre, - means of rotational drive of the winding shaft for unrolling and winding the apron between two positions, a lowered position to close the opening and a raised position to leave the opening free, these drive means comprising: * a pulley integral with said winding shaft, * a strap mounted in cooperation with the pulley so that, by a first force of traction exerted on the strap, the pulley is rotated in a first direction to tend to move the deck from its lowered position to its raised position and that, by a second traction force or analog Gue opposite to the first exerted on this strap, the pulley is driven in the opposite direction to the first direction to tend to move the deck from its raised position to its lowered position by gravity, characterized by the fact that said flight and rolling ant comprises - means for locking the apron in the lowered position to prevent it, by direct action on it, from bringing it back to its raised position, and - means for unlocking the apron to allow it to pass from a lowered position to a raised position, said means for locking the apron in the lowered position comprising means cooperating with said winding shaft or the pulley secured in order to prevent its rotation in the first direction, and said means for unlocking the apron comprising cooperating means with said means for driving the winding shaft in rotation in order to allow the rotation of the winding shaft to be released

in the first sense.

  If it is an advantageous characteristic, the means for lowering the apron in the lowered position comprise: an assembly comprising a ratchet wheel comprising bevel cut teeth and a pawl defined between two first and second ends, said assembly being mounted in cooperation with the winding arDre so that: A the ratchet wheel is integral with said winding arre, and that A the ratchet is mounted, by its first end, in rotation around a second axis parallel to the first axis so that it is able to take two positions, a meshed position in which its second end is meshed in the teeth of the ratchet wheel, preventing the ratchet wheel from rotating in the direction allowing the rewind turn in the first direction to move the apron from its lowered position to its raised position, and a disengaged position which allows the ratchet wheel to turn in the first direction, and - elastic means for tending to bring said pawl into its engaged position, the means for unlocking the deck comprising means for transforming the first tensile force applied to said strap into a rotational driving force applied to said ratchet to tend to move it from its geared position to its position, aesengrenee. Other characteristics and advantages of the invention will become apparent during the

  following description given with reference to the drawings annexed by way of illustration but

  in no way limiting, in which: FIGS. 1 and 2 represent, in schematic form and according to an end view in partial transverse section, two embodiments of a rolling shutter according to

the invention.

  Figures 3 and 4 represent two diagrams respectively illustrating the breakdown of the forces which apply during the operation of the shutter according to

  the two embodiments schematically illustrated in FIGS. 1 and 2.

  Figures 5a to 5c show, in schematic form and in an internal cross-sectional view, the embodiments of the roller shutter according to Figures 1

  or 2, in three different operating positions.

  It is clearly specified that, in the figures, the same references designate the same elements, whatever the figure on which they appear and whatever the form of representation of these elements. Likewise, if elements are not specifically referenced in one of the figures, their references can be easily found by

referring to another figure.

  The Applicant also wishes to specify that the figures represent two embodiments of the object according to the invention, but that there may be other modes of

  realization that meet the definition of this invention.

  It further specifies that, when, according to the definition of the invention, the object and the invention comprises "at least one" element having a given function, the mode of

  embodiment described may include several of these elements.

  It also specifies that, if the embodiments of the object according to the invention as illustrated comprise several elements of identical function and that if, in the

  description, it is not specified that the object according to this invention must obligatorily

  include a particular number of these elements, the subject of the invention could be defined

  as having "at least one" of these elements.

  The present invention relates to a rolling type shutter with anti-lift security device capable of being associated with an opening of a building of any kind

  whatever, having a vertical component.

  The roller shutter comprises, with reference to FIGS. 1 to 5, an apron 1 with articulated blades capable of being wound and unwound, of the type with rigid blades mounted pivoting with respect to each other, a winding shaft 2 defined according to a first axis 3 and provided with lateral flanges 51 to ensure correct guiding of the winding of the apron around the winding shaft, by means 4 to link the primary blade 5 of the apron 1 with the winding shaft 2, that is to say the highest blade of the tab lier or first blade starting from the winding shaft, and means 6 for driving in rotation of the winding shaft 2 to unroll and wind the apron between two positions, one position

  lowered to close the opening and a raised position to leave the opening free.

  These drive means 6 comprise, as illustrated, a pulley 7 or the like secured to the winding shaft 2, that is to say rigidly fixed to the latter, a strap 8 mounted in cooperation with the pulley 7 so that , by a first tensile force exerted on the strap, the pulley is rotated in a first direction according to arrow S. Figure 1, to tend to pass the deck 1 from its lowered position to its raised position and that, by a second tensile force or the like opposite to the first exerted on this strap, the pulley is released and can rotate in the direction according to arrow D, FIG. 1, opposite to the first direction to tend to move the deck from its raised position to its position lowered by gravity. To this end, the strap 8 has a first end 40 connected in a known manner to a spring box located ergonomically in general in a zone between the middle part and the bottom part of the opening, the other end 41 of the strap 8 being fixed to the pulley 7 so that the strap is wound around this pulley when the apron passes from its raised position to its lowered position, under the action of its weight when the strap is relieved by its end 40 against the effect of the spring of the spring box 42. The second pulling force therefore has the effect of canceling the tension exerted on the strap by the spring box in which the end 40 of the strap, release the strap from the spring box, and thus release the pulley during the course of the tab lier

the opening.

  In known manner, the deck 1 is guided in its movements by these lateral edges in appropriate slides 52 placed in the opening of the building or

  analog in which the roller shutter is installed.

  The flap further comprises means 9 for locking the apron 1 in the lowered position and thus preventing it, by direct action on it, from returning it to its raised position. According to a characteristic of the invention, these means 9 comprise, in the two illustrated embodiments, an assembly 20 comprising a ratchet wheel 21 comprising teeth 22 cut in a bevel and a pawl 23 defined between two first 24 and second 25 ends , this assembly being mounted in cooperation with the winding shaft 2 so that the ratchet wheel 21 is integral with the winding shaft 2 and that the pawl 23 is mounted, by its first end 24, in rotation around a

  second axis 26 parallel to first axis 3, by means of a “rotation shaft-

  bearing "so that this pawl is able to assume two positions, a geared position shown in solid lines in FIG. 1, in which its second end 25 is meshed in the teeth 22 of the ratchet wheel, preventing the ratchet wheel 21 to rotate in the direction allowing the winding shaft to rotate in the first direction S to raise the deck, that is to say to make it pass from its lowered position to its raised position, and a disengaged position, shown in broken lines in Figure 1 and in solid lines in Figure 2, which allows the ratchet wheel 21 to rotate in this first direction, and elastic means 27 to tend to bring the pawl 23 into its position

1 S gear.

  The elastic spring means 27 can be constituted by a tension spring like that which is illustrated diagrammatically in FIG. 1, or by a flexible leaf spring 27 like that which is illustrated diagrammatically in FIG. 2, but it can also be produced by a spring wound in a spiral and interposed in a manner known in it

  even between the rotation axis of the pawl and the pawl or its bearing.

  These means 9 further comprise according to the embodiments shown, and according to any known means, in particular as shown in Figures Sa-c connecting rod means 53 establishing an articulated connection between each of the two lateral ends of the primary blade S and l 'winding shaft 2 preferably via its side flanges S 1, so that the two connecting rods 53 come to prevent, when the deck is fully lowered in the opening as shown in Figure Sa, any relative movement between the deck 1 and the winding shaft 2, this immobilization being obtained for example in the lowered position of the deck by bracing or the like of the connecting rods 53 between its own ends, the trunk SO and the winding shaft 2, as shown in the figure Sa. The connecting rods-primary blade connection being a connection with a degree of freedom in rotation, the deck is immobilized relative to the winding shaft. The operation of the connecting rods 53 is as follows: in FIG. Sa, the connecting rod automatically adopts this position at the end of the apron unwinding 1, and, in combination with the ratchet-ratchet wheel device 21, 23 described above, makes it possible to carry out a blocking of the apron in the lowered position, the immobility of the apron 1 relative to the trunk SO being obtained via the connecting rod elements 53, winding shaft 2, ratchet wheel 21, pawl 23. When the apron is raised via the strap of manceuvre, the winding shaft exerts traction on the flexible fasteners 4 which wind around the shaft, as shown in Figure Sb, by driving the deck 1 and the rods 53 which slide in circular slides 54 produced in the flanges S1 so as not to impede the winding movement of the deck around the shaft, the connecting rods 53 being pivotally mounted on the primary blade of the deck; when the primary blade comes into contact against the winding shaft, as shown in FIG. Sc, the connecting rods 53 adopt their respective position of rest relative to the flanges S 1, cease to move in the circular slides 54, and the apron wraps around the tree when winding continues. Of course, any means making it possible to ensure relative immobility of the apron relative to the winding arDre in the lowered position of the apron may be suitable for the roller shutter according to the invention, and in particular to the embodiment of the blocking of the shaft. by a ratchet and ratchet wheel system shown on

Figures 1 and 2.

  The means 29 for unlocking the apron to enable it to pass from a lowered position to a raised position comprise means 30 for kansforming the first traction force applied to the strap into a rotational driving force applied to the pawl to tend to move it from its meshing position to its disengaged position. In a preferred embodiment the means 30 for transforming the first tensile force applied to the strap 8 into a rotational driving force applied to the pawl 23 to tend to move it from its engaged position to its disengaged position, comprise means 31 to guide the strap 8 in its movement between two first 32 and second 33 non-confused points, these two points being located substantially on either side of the assembly 20, and sliding guide means 34 on a third point 35 defined on the pawl 23, of the strap part 36 between the two first and second points 32, 33, this third point 35 being located outside the straight line 37 passing through the two first and second points 32, 33, FIGS. 1 and 3, the strap part 36 between the first and second points being arranged

  to slide on the third point.

  In practice, the means 31 for guiding the strap 8 in its movement between two first 32 and second 33 non-confused points are for example constituted by the fact that these two points 32 and 33 correspond respectively to the point of the pulley from which detaches the strap, which is therefore substantially a fixed point in the space where the roller shutter is installed, and at the point from which users maneuver the strap, which is always substantially located vertically above the pulley and can therefore be considered

  as substantially fixed in this same space.

  Figures 1 and 3 show the first embodiment of a roller shutter comprising an anti-lift device according to the invention. In this embodiment, the third point 35 is located between the two first and second ends 24, 25 of the pawl 23, the strap part 36 between the first two and the second points 32, 33 sliding on

  this third point 35 passing between the ratchet wheel 21 and this third point 35.

  Figures 2 and 4 show the second embodiment of a roller shutter comprising an anti-lift device according to the invention. In this embodiment, the third point 35 is located on the pawl 23 beyond its first end 24, the strap portion 36 between the first two and the second points 32, 33 sliding on this third point 35 so that the wheel ratchet 21 and this third point 35 are located in the same

  side relative to this part of strap 36.

  It is further specified that the first tensile force, which has been defined before, is generally given by the users themselves when they grip the

  strap and they pull it to tend to move the end 40 of this away from the pulley 7.

  As for the second opposite tensile force, it can be given by users who pull on the accessible part of the strap but in the opposite direction to tend to move the end 40 of the strap away from the spring box and thus allow the descent of the shutter by gravity, the free part of the strap 8 released from the spring box then coming to wind on the pulley 7 as the deck descends from the value of the

length of the released strap.

  In a preferred embodiment, as shown in Figures 1 and 2, the strap is in fact made up of a band, one end of which, in this case the end, is connected to a spring box as explained above, known in itself, and the other end 41 of which is fixed to the pulley 7 so that the strap is wound around this pulley when the apron passes from its raised position to its lowered position, under the action of its weight when the strap is relieved by its end 40 against the effect of the spring of the spring box 42. When the deck 1 descends, the spring of the spring box 42 is banded and the strap is wound around of the pulley 7. When the apron passes from its lowered position to its raised position, the strap unrolls from the pulley 7 and is wound in

  the spring box under the action of the banded spring which returns to its original state.

  I1 is mentioned that the third sliding point 35 may advantageously be constituted, as illustrated in the figures, by a roller mounted idly rotating or the like on

which comes to rest on the strap.

  Likewise, the flap comprises a box 50, the winding shaft 2 and the pawl 23 being pivotally mounted relative to the box 50 or the like which is itself fixed on the

  walls in which the openings are made.

  The pawl 23 is advantageously limited in its movement aimed at disengaging it from the ratchet wheel 21 by an appropriate stop 38 fixed to the shutter box

  rolling, as shown in figure 1.

  The roller shutter described above and illustrated in FIGS. 1 and 3 operates as follows: First of all, it is assumed that the deck 1 is in the lowered position and that no tensile force is exerted on the strap 8. In addition, according to the representation of Figures 1 to 4, the ratchet wheel 21 and the deck 1 are arranged on the winding shaft 2 so that this deck moves from its lowered position to its raised position, by a rotation senestrorsum S of the winding shaft 2, and therefore of the pulley 7 and the ratchet wheel 21. As

  For information, it is specified that the reverse representation has been used in the figures Sa-c.

  Under these conditions, the strap part 36 is not bandaged and the pawl 23 is in its engaged position, its end 25 abutting against a stiff blank of a

  toothing 22, position shown in solid lines in FIG. 1.

  In this configuration, if it is assumed that a force is exerted directly on the deck to tend to raise it, the ratchet wheel 21 cannot rotate and thereby prevents the rotation of the winding shaft 2, and therefore lifting the deck in combination

  with the connecting rods 53, as described above with the help of Figures Sa-c.

  When we want to move the deck 1 from a lowered position to a raised position, it suffices to exert on the end 40 of the strap 8 near point 33, a pulling force downwards by reference to FIGS. 1 and 3. During this traction against the opposite force which is exerted on its end 41 mounted in cooperation with the pulley 7, the part 36 of the strap tends to bandage and take the position shown in

  broken lines in this same figure 1.

  In this movement, it drives the sliding point 35 in a translation to the left with reference to FIG. 1, which causes the pawl 23 to pivot in a senestrorsum rotation. In this rotation, the end 25 of the pawl emerges from the ratchet wheel 21 which can then pivot in the senestrorsum direction, allowing the deck to be wound on the winding shaft 2. When the tensile force does not s '' exercises more on the strap at its end 40, under the action of the spring 27, the pawl can return to its position

meshed on the ratchet wheel.

  To move the apron 1 from its raised position to its lowered position, in order to close the opening of the building or the like, it suffices to exert a tensile force on the strap, opposite to the tensile force which allowed the lifting of the deck 1.1a pulley 7 then pivots in the direction dextrorsum D and the end 25 of the pawl 23 slides on the oblique blanks of the teeth without preventing the rotation of this pulley. The winding shaft being linked to the pulley, it pivots in the same direction D and unrolls the deck to bring it into its

  lowered position allowing partial or total closing of the opening.

  It is understood that in the configuration of a total closure of the opening, the return force of the pawl against the ratchet wheel must be calculated so that the return spring of the pawl can play its role despite the tension of the strap due to the spring box. The operation of the embodiment illustrated in FIGS. 2 and 4 will not be

  described here because it is deduced without any difficulty from the structural description made

  before and that of the operation of the embodiment according to Figures 1 and 3

given above.

  It is specified that these two operating modes can be explained by the content of FIGS. 3 and 4 which give a vector representation of the forces which

  apply to the pawl, at its point 35, by means of strap 8.

  It suffices to note that the two forces F 1 and F2 which are exerted on the strap when the tensile force is applied to its end 40 are equivalent to a resultant F3 which, itself, breaks down into two components, a tangential component F4 and an orthogonal component Fs which is perpendicular to the second axis 26, which causes, in a manner known per se, the rotation of the pawl in the direction

senestrorsum mentioned above.

  The forces F 1 to Fs represented in FIG. 4 have different orientations from those according to FIG. 3, due to the position of the point 35 on the pawl 23, but give

  always a senestrorsum rotation of this ratchet.

i

Claims (8)

  1. Roller shutter capable of being associated with an opening comprising a vertical component, comprising: - an apron (1) with articulated blades capable of winding and unwinding, - a winding artery (2) defined along a first axis (3), - means (4) for connecting a primary blade (5) of the deck with the winding shaft 1 0, - drive means (6) in rotation of the winding shaft (2 ) to unwind and wind the apron between two positions, a lowered position to close the opening and a raised position to leave the opening free, these drive means comprising: * a pulley (7) integral with said winding artre, * a strap (8) mounted in cooperation with the pulley (7) so that, by a first pulling force exerted on the strap, the pulley is rotated in a first direction to tend to move the deck from its position lowered to its raised position and that by a second pulling force or the like opposite to the first exercise on this strap, the pulley is driven in the opposite direction to the first direction to tend to move the deck from its raised position to its lowered position by gravity, charac terized by the fact that said vo l et ant roller comprises means (9, 53) for locking the apron (1) in the lowered position to prevent it, by a direct action on it, from returning it to its raised position, and - means (29) for unlocking the apron (1) to enable it to pass from a lowered position to a raised position, said means for locking the apron in lowered position comprising means (20) cooperating with said winding shaft (2) or the pulley (7) integral in order to prevent its rotation in the first direction, and said means (29) for unlocking the deck (1) comprising means (30) cooperating with said drive means (6) in rotation of the shaft winding (2) in order to allow a release of shaft rotation winding in the first direction.   2. Roller shutter according to claim 1, characterized in that the means (9) for locking the deck in the lowered position comprise: - an assembly (20) comprising a ratchet wheel (21) having teeth (22) cut into bevel and a pawl (23) defined between two first and second ends (24, 25), said assembly being mounted in cooperation with the winding shaft (2) so that: At the ratchet wheel (21 ) is integral with said winding shaft, and that AT the pawl (23) is mounted, by its first end (24), in rotation about a second axis (26) parallel to the first axis (3) so that it is able to take two positions, a meshed position in which its second end is meshed in the teeth of the ratchet wheel, preventing the ratchet wheel from rotating in the direction allowing the winding shaft to rotate in the first direction to move the apron from its lowered position to its position it is raised, and a disengaged position which allows the ratchet wheel to turn in the first direction, and - elastic means (27) to tend to bring said pawl (23) into its engaged position, and that the unlocking means ( 29) of the deck (1) comprise means (30) for transforming the first tensile force applied to said strap (8) into a rotational driving force applied to said pawl (23) to tend to pass it from its   gear position to its disengaged position.   3. Roller shutter according to claim 2, characterized in that the means (30) for transforming the first tensile force applied to the strap (8) into a rotational drive force applied to the pawl (23) to tend to move it from its engaged position to its disengaged position, comprise: - means (31) for guiding said strap (8) in its movement between two first (32) and second (33) unmatched points, these two points being located on either side of said assembly (20), and - sliding guide means (34) on a third point (35) defined on the pawl (23), of the part (36) of strap included between the two first and second points (32,33), this third point (35) being located outside the straight line (37) passing through the two first and second points (32, 33), the strap part (36) lying between the   two first and second points being arranged to slide on said third point.   4. Roller shutter according to claim 3, characterized in that said third point (35) is located between the two first and second ends (24, 25) of said pawl (23), the strap part (36) between two first and second points (32, 33) sliding on said third point (35) passing between the ratchet wheel (21) and this third point (35).   5. Roller shutter according to claim 3, characterized in that said third point (35) is located on said pawl (23) beyond its first end (24), the strap part (36) lying between the two first and second points (32, 33) sliding on this third point (35) so that the ratchet wheel (21) and this third point (35) are   located on the same side with respect to this part of strap (36).   6. Roller shutter according to one of claims 1 to 5, characterized in that a   first end (40) of the strap (8) is mounted in cooperation with a spring box (42), the second end (41) of the strap being integral with the pulley (7), this so-called strap   being further arranged to wrap around said pulley (7).   7. Roller shutter according to one of claims 2 to 6, characterized in that   said pawl (23) is mounted, by its first end (24), in rotation about a second axis (26) by means of a "staircase rotation artery" assembly, the means of   spring (27) being constituted by a flexible leaf spring.   8. Roller shutter according to claims 2 to 6, characterized in that it   comprises a box (50), the winding shaft (2) and the pawl (23) being pivotally mounted