FR2811013A1 - MANUAL TYPE DRIVE DEVICE FOR ROLLING SHUTTER - Google Patents

Abstract

The present invention relates to a drive device (1) of manual type of a winding shaft (5) of a roller shutter curtain, said device (1) comprising a pulley (3) for winding a roller shutter. operating cord (2) integral in rotation with said winding shaft (5) by a reduction mechanism (6) and being completed by a torque limiting mechanism (14). This device is characterized in that: - said mechanism reduction gear (6) comprises a sun gear (7), associated with said drive shaft (4), and cooperating with at least one planet wheel (11) of a planet carrier (10) meshed on a fixed ring gear (8 ) of the drive device (1); - said torque limiting mechanism (14) is defined by said planet carrier (10) rotatably mounted on said pulley (3) and comprising drive means (15) cooperating with additional drive means (16) associated with this pulley (3), these drive means (15) and / or these drive means complementary element (16) being of elastic type.

Description

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  The present invention relates to a manual type drive device of a winding shaft on which is wound the apron of a rolling shutter, said driving device comprising a pulley, on the one hand, on which is wound at least partly an operating cord or the like and, on the other hand, integral in rotation, by means of a reduction mechanism, with a drive shaft engaged with said winding shaft, said device being completed by a torque limiting mechanism authorizing the disengagement of the pulley drive beyond a determined resisting torque

produced by the winding shaft.

  The present invention will find its application in the field of the manufacture of roller shutters intended to equip a door, window or the like and relates, more particularly, to the design of the devices for driving the winding shaft.

of the deck of such a rolling shutter.

  We already know training devices

  corresponding to the above description and comprising a pulley

  suitable for driving in rotation, by means of a

  reduction, the drive shaft of a winding shaft.

  Such a device has been described in document EP-0,692,605 and comprises, interposed between the pulley and said reduction gear, a torque limiting mechanism. The latter adopts the form, on the one hand and at the level of said reduction mechanism, of a disc whose peripheral periphery has inclined surfaces and, on the other hand and at the level of said pulley, a belt provided with inclined walls suitable, as the case may be, for clinging to or sliding on the reverse surfaces of said disc in order to, respectively, drive the latter or, in particular by

  if it is blocked, do not drive it.

  The inclined walls of said belt are defined by elastic washers, on the one hand, fitted with pads intended to cooperate with the downward surfaces and, on the other hand, prestressed so as to ensure such cooperation as soon as they are removed.

  mounting on the disc of the reduction mechanism.

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  It will be observed that the traction exerted by a user on a cord associated with the pulley results in a torque exerted by the belt of the latter on the disc of the reduction mechanism. The transmission of this torque to said mechanism and, therefore, to the drive shaft, then depends on the

  coefficient of adhesion of the pads on said disc.

  It is obvious that this coefficient of adhesion is liable to change over time and depends on the state of the surfaces on the slopes and of the pads as well as on the stress exerted by the elastic washers. The relaxation of this constraint and / or fouling of the tilted surfaces and / or wear of the pads can prevent the deck from moving. In addition, it will be noted that over time, in particular when said torque limiting mechanism is not very stressed, the pads may tend to stick to the sloping surfaces so that the torque to be exerted on the pulley in order to actuate said torque limiting mechanism

  increases at the risk of rendering it inoperative.

  The present invention seeks to overcome the drawbacks of the state of the art training devices.

technical.

  To this end, the present invention relates to a drive device of the manual type of a winding shaft on which is wound the deck of a rolling shutter, said drive device comprising a pulley, on the one hand, on which is wound at least partly an operating cord or the like and, on the other hand, integral in rotation, by means of a reduction mechanism, of a drive shaft in engagement with said shaft winding, said device being completed by a torque limiting mechanism authorizing the disengagement of the drive by the pulley beyond a determined resistive torque produced by the winding shaft, characterized in that: - said mechanism reduction is of the epicyloidal gear type and comprises a planetary gear, associated with said drive shaft, and capable of cooperating with at least one satellite wheel, mounted on a planet carrier, and geared on a fixed ring of the device drive;

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  - Said torque limiting mechanism is defined by said planet carrier, on the one hand, on which is mounted, in rotation, said pulley, and, on the other hand, comprising drive means capable of cooperating with means of 'additional drive associated with this pulley, these drive means and / or these additional drive means being of elastic type so as to allow their deformation under the effect of a resistance to drive determined in order to allow a free

  rotation of the pulley relative to said planet carrier.

  Another characteristic is that said pulley

  adopts the form of a sheave at the rear of which is disposed said carrier

  satellite, on the latter being rotatably mounted at least one satellite wheel via an axis, defining said drive means, and able to cooperate with at least one elastic blade, extending at the rear of said sheave, and defining said

  additional training resources.

  According to an additional characteristic of the present invention, said pulley takes the form of a crown defining a bore inside which is housed, at least in part, said planet carrier, on the latter being mounted in rotation at least one satellite wheel via an axis, defining said drive means, and able to cooperate with at least one elastic blade, extending through said bore, and defining

  said complementary drive means.

  In fact, the reduction mechanism comprises several satellite wheels, preferably three in number, each mounted on said planet carrier by means of an axis, these axes being, on the one hand, arranged concentrically, in particular at 120, and, on the other hand, capable of defining said means

drive.

  An additional characteristic relates to the complementary drive means which are defined by at least one elastic blade adopting, at least in part, an arcuate shape of radius of curvature adjusted to the concentric arrangement of the axes of the satellite wheels, such an elastic blade being intended to cooperate

  with means capable of making it integral with said pulley.

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  In fact, the additional training means are

  constituted by an elastic blade of annular shape.

  An additional characteristic concerns the fact that said

  annular blade is defined by two semi-blade portions

  circular comprising, at at least one of their free ends, an extension capable of cooperating with a receiving member formed at said pulley and defining said

means of solidarity.

  Said annular elastic blade is defined by a single piece comprising two semi-circular portions connected together at the level of the extension fitted to one of the free ends

  of each of these semicircular portions.

  An additional characteristic relates to the fact that at the level of the elastic blade or blades corresponding to the complementary drive means is provided, in particular by deformation, at least one cradle for receiving an axis of a satellite wheel. According to another characteristic, said drive shaft

  has a ring gear capable of cooperating with the wheel (s)

  satellites and comprising an axial extension rotatably mounted on a sleeve at which said fixed ring of the reduction gear mechanism is defined capable of cooperating with this or these satellite wheels. In fact, the planet wheel or wheels have a double toothing capable of meshing, for one, on the toothed crown of the drive shaft and, for the other, on the fixed crown, said crowns comprising , depending on the case, a number of teeth

identical or different.

  The planet wheel or wheels may, however, have a simple toothing capable of meshing with the toothed crown of the drive shaft as well as on the fixed crown, said crowns

  comprising, in this case, a different number of teeth.

  The advantages of the present invention consist in that the drive device for the winding shaft is capable of being disengaged so as to prevent the drive of the shaft.

winding by the pulley.

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  Thus, when the deck is immobilized, for example in the fully folded position, in the fully or at least partially deployed position, in particular after stopping on an obstacle, the disengageable nature of this drive device makes it possible to prevent the pulley from exert a constraint on the drive shaft knowing that such a constraint would be likely to cause significant damage to said drive device or even to the deck itself. In this regard, it should be noted that such a declutching is all the more beneficial as the presence of a reduction mechanism prevents a user from realizing the stress actually imposed on the pulley which, in absence of a torque limiting mechanism, would be liable to cause damage to said drive device, or even to the bulkhead

all the more important.

  According to another advantage of the present invention, said complementary drive means take the form of at least one blade whose design is particularly clever and which

  represents a low cost price.

  The establishment of such a blade at the pulley and the reduction mechanism is carried out by simple operations

mounting.

  Another advantage, again, is that the elastic blade comprises a cradle for receiving the axis of a satellite wheel, such a cradle being capable of defining a surface through which said blade, driven by the pulley, exerts a force on said axis, a component of which is oriented in the direction of movement of the latter. Other objects and advantages of the present invention will become apparent

  during the description which follows relating to modes

  of realization which are given only as indicative examples

and not limiting.

  Understanding this description will be facilitated by

  Referring to the attached drawing in which: - Figure 1 is a schematic perspective view of a drive device according to the invention;

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  - Figure 2 is a schematic view, in elevation and in section along IIII of Figure 3 corresponding to the drive device; - Figure 3 is a schematic view in section on III-III of Figure 2. - Figure 4 is a schematic view of an elastic blade

  annular shape shown in Figure 3.

  The present invention relates to the field of roller shutters and relates more particularly to a device for driving the

apron of such a shutter.

  As visible in the figures of the appended drawing, such a drive device 1 is of the manual type and is susceptible

  to be operated via a cord 2 or the like.

  Said drive device 1 comprises a pulley 3 around which is wound, at least partially, said cord 2, this pulley 3 being mounted, integral in rotation and by means of a reduction mechanism 6, on a drive shaft 4 in engagement with the winding shaft 5 of the apron of the

roller shutter.

  As shown in FIG. 2 and according to the invention, said reduction mechanism 6 is of the epicyloidal gear type and is defined, on the one hand, by a sun gear 7 associated with said drive shaft 4 and constituted by a first ring movable gear 8, and, on the other hand, by a second fixed gear 9

  that includes said drive device 1.

  This reduction mechanism 6 is, again, defined by a satellite carrier 10 receiving at least one satellite wheel 11 rotatably mounted on the latter 10, such an assembly being produced by means of an axis 12 parallel to the axis of rotation 13 of said

satellite carrier 10.

  Such a satellite wheel 11 is intended to cooperate, on the one hand, with the mobile toothed ring 8 of the sun gear 7 and,

  on the other hand, with the fixed toothed crown 9.

  As shown in Figures 2 and 3 and according to the invention, said drive device 1 is completed by a torque limiting mechanism 14 provided capable of ensuring the disengagement of

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  the drive of the drive shaft 4 by the pulley 3, this

  beyond a determined resistant torque produced by the shaft

winding 5.

  According to the invention, said torque limiting mechanism 14 is defined by said planet carrier 10, on the one hand, on which is mounted, in rotation, said pulley 3 and, on the other hand, comprising drive means 15 able to cooperate with resources

  complementary drive 16 associated with this pulley 3.

  It will be observed that these drive means 15 and / or these complementary drive means 16 are of the elastic type and are designed so as to allow their deformation under the effect of a determined training resistance, this in order to allow a

  free rotation of the pulley 3 relative to said planet carrier 10.

  According to a first embodiment not shown, said pulley 3 can take the form of a sheave provided with a peripheral groove on which is wound, at least in part, a cord 2

or the like.

  At the rear of this sheave is disposed said planet carrier 10 on which is rotatably mounted at least one satellite wheel 11 by means of an axis 12 defining said drive means 15. This axis 12 is suitable for cooperate with at least one elastic blade 19, made integral with said sheave, extending behind the latter, and defining said means

  complementary training 16.

  However, according to a preferred embodiment of the invention and as visible in FIG. 2, said pulley 3 takes the form of a crown 17 defining a bore 18 inside which is housed, at least in part, said planet carrier 10, on the latter 10 being rotatably mounted at least one satellite wheel 11,

  this via an axis 12.

  In fact, it should be observed that the mechanism of

  reduction 6 comprises, preferably, several wheels-

  satellites 11, 11A, 11B each mounted on said planet carrier via an axis 12, 12A, 12B. The axes 12, 12A, 12B of these satellite wheels 11, 11A, liB are arranged concentrically and in a circle whose center is crossed by

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  the axis of rotation 13 of the planet carrier 10 and / or of the shaft

training 4.

  However and according to a preferred embodiment visible in FIG. 3, said planet carrier 10 receives three satellite wheels 11, 11A, 11B mounted, each on the latter 10, by means of an axis 12, 12A, 12B, these axes 12, 12A, 12B being arranged with

concentrically and at 120.

  According to the invention, said drive means 15 are defined, as the case may be, by the axis 12 of said satellite wheel 11 or

  by the axes 12, 12A, 12B of said satellite wheels 11, 11A, 11B.

  These drive means 15 are designed capable of cooperating with said complementary drive means 16 defined by at least one elastic blade 19 extending, as the case may be, behind said sheave or, at least in part, through at least part

of said bore 18.

  According to a first characteristic, such an elastic blade 19 adopts, at least in part, an arcuate shape with a radius of curvature

  adjusted to the concentric arrangement of the axles 12 of the wheels-

  satellites 11, said elastic blade 19 being intended to cooperate

  with means 20 capable of making it integral with said pulley 3.

  A preferred embodiment visible in Figure 3 consists of

  that such an elastic blade 19 adopts an annular shape.

  According to another characteristic, said annular blade 19 is defined by two portions 21, 21A of semicircular blade comprising, at at least one of their free ends 22, 23, an extension 24, 25 capable of cooperating with a receiving member 26 formed at the level of said pulley 3 and defining

  said securing means 20.

  In this regard, it will be observed that such an extension 24, 25 may be of the axial type and be oriented along the axis of rotation 13 of said

  planet carrier 10 or along the axis (s) 12 of the wheel (s)

  satellites 11. Such an embodiment allows, for example, a mounting of such an elastic blade 19 at the rear of said sheave of the

pulley 3.

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  However and according to the embodiment corresponding to a pulley 3 in the form of a crown 17, such an extension 24, 25

  is of the radial type as shown in Figure 3.

  In fact and as shown in FIG. 4, said annular elastic blade 19 is defined by a single piece comprising two semicircular portions 21, 21A connected together at the extension 24 fitted to one of the free ends 22 of each

  of these semi-circular portions 21, 21A.

  According to a first embodiment, such an elastic blade 19 can be designed capable of tightening strongly on the axes 12 of the satellite wheels 11 by exerting on the latter a radial force of sufficient intensity to ensure their drive by the pulley 3, this in below a determined resisting torque

  likely to be produced by the winding shaft 5.

  When the winding shaft 5 is immobilized in rotation, the pulley 3 exerts a torque greater than the determined torque imposed by said winding shaft 5 so that the elastic blade 19 slides relative to said axes 12 of the satellite wheels 11 ce who ensures the

disengagement of the drive.

  However and according to a preferred embodiment, the elastic blade or blades 19 of the complementary drive means 16 are completed by at least one cradle 27 for the reception of a

axis 12 of a satellite wheel 11.

  Such a cradle 27 is formed at the level of said elastic blade (s) 19, in particular by deformation when giving such blade 19 the shape in which it is located at

of said drive device 1.

  In fact, such a cradle 27 preferably consists of a

  housing of form adjusted to that of axis 12, in particular semi

circular.

  Such an embodiment has been shown in Figures 3 and 4 for an elastic blade 19 of annular shape corresponding to a mode of

  preferred embodiment of the invention.

  In this regard, it should be observed that said cradle 27 defines at least one surface 28 through which said blade 19 is capable of exerting, under the impulse of the rotation of the

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  pulley 3, and on said axis 12 a force of which a component is oriented tangentially to the circle along which said axis 12 is

likely to move.

  The application of such a force makes it possible to drive said axis 12, this below a determined resistant torque capable of

  to be produced by the winding shaft 5.

  However, when the winding shaft 5 is immobilized in rotation and exerts a determined resistive torque, the elastic blade 19 disappears and the cradle 27 disengages from its axis 12 which

  disengages the drive.

  In such a case, said axis 12 and, consequently, said satellite carrier 10, are no longer driven by the pulley 3 which

  then turns freely around said planet carrier 10.

  The user, exerting a traction on the cord 2, feels, at the level of the latter, a jerky advance corresponding to the jump

  successive of a cradle 27 on an axis 12.

  According to another characteristic of the drive device 1, the drive shaft 4 thereof has, at the level of the sun gear 7, a movable ring 8 provided with teeth 29 intended to

  cooperate with the satellite wheel or wheels 11 of the planet carrier 10.

  This ring gear 8 has an axial extension 30 capable of cooperating with a sleeve 31 in which said extension 30 is

mounted in rotation.

  It is, more particularly, at this sleeve 31 that said fixed crown 9 is defined, fitted with teeth 32 intended to

  cooperate with said one or more satellite wheels 11.

  In this regard, it will be observed that the satellite wheel or wheels 11 may, according to a first embodiment, have a double toothing 33, 34 capable of meshing, for one 33, on the teeth 29 of the toothed crown. mobile 8 of the drive shaft 4 and, for

  the other 34, on the teeth 32 of the fixed crown 9.

  In such a case, said movable toothed crown 8 and said fixed toothed crown 9 can, as the case may be, include a number of

  identical or different teeth (29, 32).

  Such double toothing 33, 34 makes it possible to constitute a

reduction mechanism 6.

  However, according to another embodiment, the satellite wheel or wheels 11 have a simple toothing capable of meshing with the toothed crown 8 of the drive shaft 4 as well as on the fixed crown 9. In this case, it will be observed that said crowns (8, 9) have a different number of teeth (29, 32). As shown in Figures i and 2, said sleeve 31 is made integral with a flange 35 adapted to be, on the one hand, disposed in front of the pulley 3 and, on the other hand, made solar of a housing

  36 inside which the drive device 1 is mounted.

  The removal of this flange 35 gives access to said pulley 3 but also to the elastic blade 19 of the complementary drive means 16 as well as to the planet carrier 10 and its satellite wheels 11, in particular for intervention on one

  any of the parts of said drive device 1.

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

  for this to move away from the framework and the spirit of the invention.

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Claims (10)

  1) drive device (1) of the manual type of a winding shaft (5) on which the roller shutter deck is wound, said drive device (1) comprising a pulley (3), d 'on the one hand, on which is wound at least partly an operating cord (2) or the like and, on the other hand, integral in rotation, by means of a reduction mechanism (6), of a drive shaft (4) engaged with said winding shaft (5), said device (1) being completed by a torque limiting mechanism (14) authorizing disengagement of the drive by the pulley (3) beyond a determined resistive torque produced by the winding shaft (5), characterized by the fact that: said reduction gear (6) is of the epicyloidal gear type and comprises a sun gear (7), associated with said shaft   drive (4), and able to cooperate with at least one wheel-   satellite (11), mounted on a planet carrier (10), and meshed on a fixed ring (8) of the drive device (1); - said torque limiting mechanism (14) is defined by said planet carrier (10), on the one hand, on which is mounted, in rotation, said pulley (3), and, on the other hand, comprising means of drive (15) capable of cooperating with complementary drive means (16) associated with this pulley (3), these drive means (15) and / or these complementary drive means (16) being of elastic type so as to allow their deformation under the effect of a resistance to drive determined in order to allow free rotation of the pulley (3) relative to said satellite carrier (10).   2) drive device (1) according to claim 1, characterized in that said pulley (3) takes the form of a sheave at the rear of which is disposed said planet carrier (10), on the latter ( 10) being rotatably mounted at least one satellite wheel (11) via an axis (12), defining said drive means (15), and able to cooperate with at least one elastic blade (19) , extending behind said sheave, and defining   said complementary drive means (16). 13 2811013   3) Drive device (1) according to claim 1, characterized in that said pulley (3) takes the form of a crown (17) defining a bore (18) inside which is housed, at at least in part, said planet carrier (10), on the latter being rotatably mounted at least one satellite wheel (11) via an axis (12), defining said drive means (15), and able to cooperate with at least one elastic blade (19), extending through said bore (18), and   defining said complementary drive means (16).   4) Drive device (1) according to any one of   Claims 2 or 3, characterized in that the said mechanism   reduction gear (6) comprises several satellite wheels (11, 11A, 11B), preferably three in number, each mounted on said satellite carrier (10) via an axis (12, 12A, 12B) , these axes (12, 12A, 12B) being, on the one hand, arranged concentrically, in particular at 120, and, on the other hand, capable of defining   said drive means (15).   ) Drive device (1) according to claim 4, characterized in that the complementary drive means (16) are defined by at least one elastic blade (19) adopting, at least in part, an arcuate shape of radius of curvature adjusted to the concentric arrangement of the axes (12, 12A, 12B) of the satellite wheels (11, 11A, 11B), such an elastic blade (19) being intended to cooperate with means (20) suitable for   make integral with said pulley (3).   6) drive device (1) according to claim 5, characterized in that the complementary drive means (16) consist of an elastic blade (19) of annular shape.   7) Drive device (1) according to claim 6, characterized in that said annular blade (19) is defined by two portions (21, 21A) of semicircular blade comprising, at the level of at least one of their free ends (22, 23), an extension (24, 25) capable of cooperating with a receiving member (26) formed at the level of said pulley (3) and defining said joining means (20). 14 2811013   8) Drive device (1) according to claim 7, characterized in that said elastic annular blade (19) is defined by a single piece comprising two semi-circular portions (21, 21A) connected together at the extension (24) fitted to one (22) of the free ends (22, 23) of each   of these semicircular portions (21, 21A).   9) Drive device (1) according to any one of   Claims 2 to 8, characterized in that at the level of the or   elastic blades (19) of the complementary drive means (16) is provided, in particular by deformation, at least one cradle (27)   for receiving an axle (12) from a satellite wheel (11).   ) Drive device (1) according to any one of   previous claims, characterized in that said tree   drive (4) has a ring gear (8) capable of cooperating with the planet wheel or wheels (11) and comprising an axial extension (30) rotatably mounted on a sleeve (31) at which said crown is defined fixed (9) of the reduction mechanism   (6) able to cooperate with the satellite wheel or wheels (11).   11) Drive device (1) according to claim 10, characterized in that the planet wheel or wheels (11) have a double toothing (33, 34) capable of meshing, for one (33) , on the ring gear (8) of the drive shaft (4) and,   for the other (34), on the fixed crown (9).   12) Drive device (1) according to claim 10, characterized in that the planet wheel or wheels (11) have a single toothing capable of meshing with the toothed crown (8) of the shaft drive (4) as well as on the fixed crown (9), said crowns (8, 9) having a different number of teeth.