FR2741661A1 - DEVICE FOR ROTATING A ROLLING SHUTTER WINDING ELEMENT - Google Patents

Abstract

The device for rotating a roller shutter curtain roller (7) in rotation comprises an electric motor (2) and a brake (10). The brake consists essentially of a member integral in rotation with the rotot (2a) of the electric motor, such as a ring (11) or a disc (14) intended to cooperate with pads (19, 19 ') carried by a flaccid. According to the invention, means (20, 22, 23, 24, 25, 26, 27) are provided for driving the flange (18) in rotation inside a fixed casing (1), these means also being able to block the flange in relation to the housing. The invention applies to the manual control of a rolling wheel.

Description

The invention relates to a device for driving the drum in rotation.

  for rolling up a roller shutter and a roller shutter comprising

such a device.

  It is known to actuate a roller shutter by means of an electric motor, however in the event of a failure of the electric motor or of interruption of the current supply to the sector, it is necessary to

  ability to manually operate the roller shutter.

  The patent application FR.A.2 455 160 discloses a device for driving a roller shutter in which, when it is necessary to use the manual control, a rotation is made about its axis of rotation. casing containing both an electric motor and its braking system. This device therefore requires providing that this casing must be able to rotate about its axis, which implies rotating electrical connections and special mechanical connections in order to allow this kind of movement. This device is therefore complex, which increases its cost and predisposes it to operating failures.

  We also know from patent application DE-A-1 201 719 a provision

  in which the movement imparted by the manual control is

  transmitted to the movable shaft by means of a planetary gear train.

  This system implements a complex transmission comprising numerous gears, including a hollow wheel and a particularly expensive screw. Finally, from the patent application FR-A-2 270 193, a device is known in which the actuation of the manual control axially displaces a rotary sliding member, which disengages the brake and engages the rotor of an electric motor. The axial displacement of the sliding member is obtained against an elastic means constituted by a return spring and thanks to the effect of a resisting friction torque, due to a braking pad, which must constantly oppose the movement to maintain the operational position of the sliding rotary member. Thus, the user who operates the manual control must

  overcome both the weight of the flap and the friction force due to the shoe.

  This makes the maneuver painful and requires significant efforts of the

user share.

  The invention solves the problems of the prior art by means of a device for rotating a drive element of a roller shutter which is relatively simple to manufacture and easy to use.

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  It relates to a device for driving a roller shutter winding element in rotation comprising an electric motor, essentially consisting of a stator and a rotor, and a brake, intended to prevent the rotation of said element. winding when said motor is not activated, said brake comprising at least one member integral in rotation with said rotor and intended to cooperate with at least one locking element carried by a flange, said motor and said brake being mounted inside a fixed casing, characterized in that it comprises means for driving said flange in rotation inside said fixed casing, said means being capable of locking

  said flange rotating relative to said fixed casing.

  The invention also relates to a rolling shutter comprising such a device.

positive.

  Thanks to the invention, it is not necessary to provide systems

  complex drive themes of the motor shaft, which allows for a simple and economical device. It also allows easy maneuvering when using the manual control since it

  it is not necessary to overcome significant friction forces.

  According to a variant of the invention, the means for driving the flange in rotation inside the fixed casing comprise an irreversible transmission which is advantageously produced by means of a spring arranged between, on the one hand, a crown secured to the fixed casing and, on the other hand, a drum connected to a manual control element and

  an element kinematically connected to the flange.

  The invention will be better understood and other advantages thereof

  will appear more clearly in the light of the description which follows

  follow of an embodiment of a conforming training device

  to its principle, given only by way of example and made in reference to

  Reference to the accompanying drawings in which: FIG. 1 is a sectional view of the device for rotating the winding drum of a rolling shutter; Figure 2 is an enlarged view of the brake device of Figure 1 and Figure 3 is a view along line III-III of Figure

2.

  The device of FIG. 1 comprises a fixed casing 1, in which is placed an electric motor 2 supplied with current by

  electrical conductors 3. The fixed casing here has the form of a cylindrical tube

  drique with circular section but any tube, cylindrical or not, whatever its section, would be compatible with the invention. The output shaft 4 of the electric motor 2 is engaged with a reduction gear 5 the output of which is fixed in rotation at the center of a disc 6 at the periphery of which is mounted a winding cylinder 7 of the bulkhead, not shown of a roller shutter. Thus, depending on the direction of rotation of the output shaft 4 of the motor 2, the winding cylinder 7 will be driven to

  roll up or unwind the roller shutter deck.

  At the end of the shaft 4 opposite the reduction gear 5 is disposed an assembly 10 forming a brake. As it appears in FIG. 2, this assembly comprises, in particular, a metal ring 11 fixed in rotation relative to the shaft 4, but capable of sliding axially on this shaft. A spiral spring 12 mounted around the shaft 4 bearing against the rotor 2a of the electric motor 2 and against the internal face of the ring 11

  tends to move aside the ring 11 from the rotor of the electric motor 2.

  When the electric motor 2 is not activated, no current flows in its rotor 2a and the ring 11 is subjected to the sole force of the spring 12, which moves it away from the electric motor. On the contrary, when the electric motor is running, the current in the rotor 2a of the electric motor induces magnetic forces which tend to attract the

  ring 11 towards the rotor and to move it in the direction thereof.

  The ring 11 is finished, at its end furthest from the

  rotor 2a of the electric motor 2, by a surface 13 substantially ortho-

  gonal to the axis of the shaft 4. Furthermore, a disc 14 is mounted fixed in rotation and in translation relative to the shaft 4 by means of an elastic pin 15. The distance between the disc 14 and the ring 11 varies therefore depending on the position of the ring 11 relative to the rotor of the electric motor. Two pins 16 and 16 'are mounted in holes in the disc 14 and the ring 11; they carry a plate 17 which they can drive in rotation. Thus the disc 14 and the plate 17 are integral with the rotor 2a. On the other hand, a flange 18 carries one or two pads 19 and 19 'in the form of a crown, immobilized in rotation relative to the latter and arranged inside the space between the disc.

  14 and the ring 11, on either side of the free plate 17.

  The operation of the brake motor is as follows: When the electric motor 2 is active, the magnetic forces induced in the rotor 2a attract the ring 11 towards the rotor, so that the disc 14 and the ring 11 are spaced apart sufficiently to that the contact between the plate 17, the disc 14 and the ring 11 on the one hand, and the pads 19 and 19 'on the other hand is not blocking. On the contrary,

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  When the motor 2 is not active, the spring 12 pushes the ring 11 in abutment against the pad 19 ', the ring 11 therefore presses the pad 19' against the plate 17 which is pressed itself against the pad 19 in support against the disc 14. In this way, the rotational movement of the ring 11 is prevented by the friction generated between the parts 14, 17, 19, 19 'and 11. The shaft 4 which is integral in rotation with the ring 11 is therefore also blocked in rotation. Thus, when the electric motor 2 is not activated, it is braked by the whole of the

  structure 10. We speak of a brake motor.

  According to the invention, the device further comprises means for driving the flange 18 in rotation inside the casing.

  fixed 1. These means comprise a rod 20 connected to its outer end

  lower than a bevel gear, itself connected to a crank 21 suscep-

  tible to be taken over by a user. The end of the rod 20 closest to the brake motor is provided with external grooves allowing it to be fixed in rotation inside a drum

training 22.

  As it appears in FIG. 3, the drum 22 is provided with a lug 23. Over the greater part of its circumference not corresponding to the angular sector occupied by the lug 23, the drum 22 is surrounded by a flange 24 d 'a sleeve 25. The sleeve 25 carries two axes of rotation 26 and 26' of two toothed wheels 27 and 27 '. Wheels 27 and 27 '

  are the satellites of a planetary gear centered on the flange 18.

  The teeth of the toothed wheels 27 and 27 'are engaged with teeth formed on the one hand on a crown 29 fixed inside the casing 1

and on the other hand on the flange 18.

  Over most of its length, the flange 18 is mounted inside

  of the ring 29, the contact between the external cylindrical surface of the flange 18 and the internal cylindrical surface of the ring 29 being a sliding contact. On the other hand, an internal cylindrical part of the crown 29 is disposed around the drive drum 22 of the flange 24 and of the sleeve 25. As shown in FIG. 3, a brake spring 30 is arranged in the space annular located between the

  crown 29, on the one hand, and the drum 22 or the sleeve 25 on the other hand.

  Because of the presence of the spring 30, a torque coming from the drum 22 can be transmitted to the sleeve 25 while a torque coming from the sleeve 25 cannot be transmitted to the drum 22. In fact, as the ends of the spring 30 are arranged in the radial spaces located between the lug 23 of the crown 22 and the sleeve 25, a torque from the sleeve 25 tends to apply the end of the spring to the lug 23 and radially dilate the envelope of the spring which comes contact with the crown 29 and thus blocks any movement. On the contrary, a rotational movement originating from the drum 22 and transmitted by the lug 23 tends to press one end of the

  spring 30 against the flange 24 of the sleeve 25 without expanding the envelope

  lops the spring 30, and the movements of the assembly formed by the drum 22 and the sleeve 25 are therefore possible inside the fixed ring 29, since the spring 30 does not prevent the transmission of a torque from drum 22 to sleeve 25, whatever

meaning of this couple.

  The operation is as follows: If the motor 2 is not activated, we have seen previously that the ring 11 and the disc 14 compress

  the pads 19 and 19 'so that a rotation of the shaft 4 would have

  dance to rotate the flange 18. If the flange 18 is rotated, it tends to rotate the toothed wheels 27 and 27 'which are themselves engaged with the teeth of the crown 29. This has the consequence that the axes 26 and 26 'tend to rotate, and therefore that the sleeve 25 tends to rotate. As we have seen previously, this rotational movement is prevented by the presence of the spring 30. Thus, the flange 18 is locked in position and the brake assembly 10 is very effective: it prevents the rotation of the shaft 4 when the engine

electric 2 is not activated.

  On the contrary, if it is necessary to use the manual control, the rod 20 is rotated by means of the crank manipulated by the user. The drum 22 is then driven in rotation and the latter rotates the sleeve 25 without being prevented by the spring 30 according to what has been seen previously. According to a kinematics opposite to that which has been described above, the sleeve 25, the axes 26 and 26 ', the toothed wheels 27 and 27' cause the flange 18 to rotate in the direction of rotation of the rod 20. The shaft 4 being integral with the flange 18 thanks to the brake assembly 10, it is rotated and thereby the reduction gear 5, the

  disc 6 and cylinder 7 are also set in motion.

  It should be noted that the sliding contact between the flange 18 and the internal cylindrical surface of the crown 29 allows the user to maneuver the roller shutter without having to overcome a significant friction force, which is a significant improvement over the devices. of

prior art.

  It therefore appears that the assembly which has been described above constitutes

  kills an irreversible transmission allowing the transmission of a movement-

  ment of the rod 20 towards the shaft 4, but blocking the transmission of a

  movement from shaft 4 to rod 20.

  According to a variant of the invention not shown, the irreversible transmission could be achieved by a system comprising a worm wheel. Any other irreversible transmission could also be used. The roller shutter has been shown with a cylinder 7, but it can operate with one or more discs 6 connected directly to the roller shutter deck, in particular if the latter consists of slats or blades. Likewise, the invention has been presented with a shoe brake motor, but it applies to any type of brake applicable to its technical field, and in particular to a dog brake, the element of which

  blocking consists of the dog itself.

Claims (10)

R E V E N D I C A T I 0 N S   1. Device for rotating a winding element   Lement (7) of roller shutter curtain comprising an electric motor (2), essentially consisting of a stator and a rotor (2a) and a brake (10), intended to prevent the rotation of said winding element when said motor is not activated, said brake comprising at least one member (11, 14, 19), integral in rotation with said rotor and intended to cooperate with at least one locking element (19, 19 ') carried by a flange (18 ), said motor and said brake being mounted inside a fixed casing (1), characterized in that it comprises means (20, 22, 23, 24, 25, 26, 27) for driving said flange rotating inside said fixed casing, said means being able to block   said flange rotating relative to said fixed casing.   2. Drive device according to claim 1, characterized in that said means comprise an irreversible transmission (22, 23, 24, 25, 30).   3. Drive device according to claim 2, characterized in that said irreversible transmission comprises a spring (30) disposed between, on the one hand, a ring (29) integral with said fixed casing (1) and, on the other hand , a drum (22) connected to a control element   manual (20) and a sleeve (25) kinematically connected to said flange.   4. Drive device according to claim 3, characterized   in that the envelope of said spring (30) is able to expand radially-   when applying to said drum (22) a torque transmitted by said sleeve (25).   5. Drive device according to claim 3, characterized in that the envelope of said spring (30) does not expand radially during the transmission of a torque from said drum (22) to said sleeve (25). 6. Drive device according to claim 2, characterized in that said irreversible transmission comprises a worm wheel. 7. Drive device according to claim 1, characterized   in that said winding element is a winding cylinder (7).   8. Drive device according to claim 1, characterized in that said winding element is a disc (6) supporting said deck. 8 2741661   9. Drive device according to claim 1, characterized in that said blocking element is one or two pads (19, 19 ') in the form of a crown and said member integral with the rotor (2a) is a ring   (11), a disc (14) or a tray (17).   10. Roller shutter comprising a drive device according to   one of the preceding claims.