EP1568845A1 - Opening and closing device for an opening element having a couple limiting function - Google Patents

Abstract

The present invention relates to a device for closing and opening an opening, such as in particular a rolling shutter, blind or the like, such as in particular a shutter, blind or the like, comprising maneuvering means, means for transmission and mechanical end-of-travel means. According to the invention, the mechanical end-of-travel means are constituted by a clutch device (1), having at least: a first drive element (2), secured to the operating means, having a double-slope radial toothing , a first slope (4) for meshing in a first direction of rotation, a second slope (5) for meshing in a second direction of rotation, a second element (3), driven, secured to the transmission means, having a radial toothing with double slope coinciding with the radial toothing of said first driving element (2), resilient means for pressing the first element (2) and the second element (3) against each other at the level of their teeth <IMAGE >

Description

The present invention relates to a closure device and opening an opening, such as in particular a shutter, blind or similar, comprising maneuvering means, transmission means and mechanical end-of-stroke means.

Document FR-2,729,771 is particularly known from such closing and opening devices. It presents a clutch device provided with of a pin traversing radially a shaft integral with the drum coming from make contact, pressed by a spring, at the level of conformal impressions performed at the bottom of a bore of a sleeve surrounding said shaft.

The limiting torque from which the pin will come out of footprints is determined by the elastic means and in particular the stiffness of the spring used and the geometry of the contact zone between the pin and the impression.

However, in this known device, the contact zone is generally semi-cylindrical and identical in both directions of rotation. It does not allow in particular to easily define the limit torque in playing on said contact geometry. Moreover, such a geometry does not allow not to obtain a different limit torque according to the two directions of rotation.

The purpose of the present invention is to propose a device for closing and opening of an opening, comprising means for transmission, maneuvering means and end-of-travel means to torque limiter function in both directions of rotation, which compensates for disadvantages mentioned above, and in particular makes it possible to have a zone of contact whose geometry authorizes, during the design, to define the couples limits in an easy and standardized way in said two directions of rotation.

Another object of the invention is to propose a device to settle jointly and easily during the course of the installation of said opening and / or closing device, the one or more couples limits in both directions of rotation.

Another object of the invention is to propose a device for closing and opening equipped with a brake system that holds the shutter even when the clutch device decouples the means of maneuvering the transmission means or during a failure of said clutch device.

Other goals and benefits will emerge during the following description which is given for information only and which does not have for purpose of limiting it.

• un premier élément d'entraínement, assujetti aux moyens de manoeuvre, présentant une denture radiale à double pente, une première pente pour engrener dans un premier sens de rotation, une deuxième pente pour engrener dans un deuxième sens de rotation,
• un deuxième élément entraíné, assujetti aux moyens de transmission, présentant une denture radiale à double pente coïncidant à la denture radiale dudit premier élément d'entraínement,
• des moyens élastiques pour presser le premier élément et le deuxième élément l'un contre l'autre au niveau de leur denture, de telle façon que lorsque le couple transmis par le premier élément d'entraínement audit deuxième élément entraíné devient supérieur à une valeur prédéterminée au moins un des deux éléments s'écarte pour que ledit premier élément d'entraínement n'engrène plus ledit deuxième élément entraíné et en ce que l'angle constitué entre la ligne d'action induite par le couple suivant ledit premier sens de rotation et ladite première pente est inférieur à l'angle constitué entre la ligne d'action induite par le couple suivant ledit deuxième sens de rotation et ladite deuxième pente, de telle façon que le couple limite C₁ nécessaire pour que ledit premier élément d'entraínement n'engrène plus ledit deuxième élément entraíné dans ledit premier sens de rotation est inférieur au couple limite C₂ nécessaire pour que ledit premier élément d'entraínement n'engrène plus ledit deuxième élément entraíné dans ledit deuxième sens de rotation.

The invention relates to a device for closing and opening an opening, in particular a shutter, blind or the like, comprising a movable member such as a shutter drum, operating means such as in particular a crank, transmission means such as in particular a winch, and mechanical end-of-travel means, with torque limiting function, in both directions of rotation, characterized in that the mechanical end-of-travel means consist of a device for dog, showing at least:

• a first drive element, subject to the operating means, having a double slope radial toothing, a first slope for meshing in a first direction of rotation, a second slope for meshing in a second direction of rotation,
• a second element driven, subject to the transmission means, having a double slope radial toothing coinciding with the radial toothing of said first drive element,
• elastic means for pressing the first element and the second element against each other at their teeth, such that when the torque transmitted by the first drive element to said second driven element becomes greater than a predetermined value at least one of the two elements deviates so that said first drive element no longer meshes said second driven element and in that the angle formed between the action line induced by the torque along said first direction of rotation and said first slope is less than the angle formed between the action line induced by the torque along said second direction of rotation and said second slope, so that the limit torque C ₁ required for said first drive element meshes more said second element driven in said first direction of rotation is less than the limit torque C ₂ necessary for said pre The first drive member no longer meshes said second member driven in said second direction of rotation.

• la figure 1 est une vue de coupe du dispositif à crabot conforme à l'invention selon le cadre I-I tel qu'illustré à la figure 6,
• la figure 2 est une vue schématique des efforts mis en jeu au niveau de la denture du dispositif à crabot conforme à l'invention à l'équilibre et pour un couple limite C₁ suivant un premier sens de rotation,
• la figure 3 est une vue schématique des efforts mis en jeu au niveau de la denture du dispositif à crabot conforme à l'invention, à l'équilibre et pour un couple limite C₂ suivant un second sens de rotation,
• la figure 4 est une vue en perspective du dispositif de fermeture et d'ouverture d'un ouvrant conforme à l'invention suivant un premier mode de réalisation,
• la figure 5 est une vue de profil du dispositif de fermeture et d'ouverture d'un ouvrant conforme à l'invention tel qu'illustré à la figure 4,
• la figure 6 est une vue selon la coupe VI-VI telle qu'illustrée à la figure 5,
• la figure 7 est une vue en perspective éclatée du dispositif selon un second mode de réalisation de l'invention,
• la figure 8 est une vue de face partielle du dispositif selon un second mode de réalisation,
• la figure 9 est une vue de profil de l'invention telle qu'illustrée à la figure 8,
• la figure 10 est une vue selon la coupe X-X telle qu'illustrée à la figure 9,
• la figure 11 est une vue selon la coupe X-X telle qu'illustrée à la figure 9 le crabot débrayé, et une vue selon le cache XI-XI,
• la figure 12 est une vue de coupe du dispositif à crabot selon un troisième mode de réalisation.

The invention will be better understood on reading the following description which forms an integral part thereof and among which:

• FIG. 1 is a sectional view of the clutch device according to the invention according to the frame II as illustrated in FIG. 6,
• FIG. 2 is a schematic view of the forces involved at the level of the toothing of the clutch device according to the invention at equilibrium and for a limit torque C ₁ according to a first direction of rotation,
• FIG. 3 is a schematic view of the forces involved at the level of the toothing of the clutch device according to the invention, at equilibrium and for a limiting torque C ₂ in a second direction of rotation,
• FIG. 4 is a perspective view of the device for closing and opening an opening leaf according to the invention according to a first embodiment,
• FIG. 5 is a profile view of the device for closing and opening an opening leaf according to the invention as illustrated in FIG. 4,
• FIG. 6 is a view along section VI-VI as illustrated in FIG. 5,
• FIG. 7 is an exploded perspective view of the device according to a second embodiment of the invention,
• FIG. 8 is a partial front view of the device according to a second embodiment,
• FIG. 9 is a side view of the invention as illustrated in FIG. 8,
• FIG. 10 is a view along section XX as illustrated in FIG. 9,
• FIG. 11 is a view along section XX as illustrated in FIG. 9 with the clutch disengaged, and a view according to the cover XI-XI,
• Figure 12 is a sectional view of the clutch device according to a third embodiment.

The invention relates to a closing and opening device 15 of an opening, in particular a shutter (not shown), blind or the like, comprising a movable member such as in particular a drum (not shown), maneuvering means such as in particular a crank (not shown), transmission means 16, 17, such as in particular a winch, and mechanical end-of-travel means 2, 3, with torque limiter function in both directions of rotation.

The invention will find a particular application for roller blind aprons rigidly attached to the drum by means of a latch. A lock allows the jamming of the apron at the end of the low stroke and prevents any fraudulent lifting of said shutter. Generally, roller shutter aprons additionally have stop-action projections which come into contact at the end of the high run with the high crossbar, the trunk or the lintel.

In the case of a high and / or low stop, too much effort important on the actuating means such as the crank can cause the destruction of the apron or transmission mechanism. End means in accordance with the invention make it possible to protect the device closing and opening and in particular the rolling shutter apron and its means transmission in the case of an upper stop and in the case of an abutment low.

• un premier élément 2 d'entraínement, assujetti aux moyens de manoeuvre, présentant une denture radiale à double pente, une première pente 4 pour engrener dans un premier sens de rotation, une deuxième pente pour engrener dans un deuxième sens de rotation,
• un deuxième élément 3 entraíné, assujetti aux moyens de transmission, présentant une denture radiale à double pente coïncidant à la denture radiale dudit premier élément 2 d'entraínement,
• des moyens élastiques 6 pour presser le premier élément 2 et le deuxième élément 3 l'un contre au niveau de leur denture, coopérant de telle façon que lorsque le couple transmis par le premier élément 2 d'entraínement audit deuxième élément 3 entraíné devient supérieur à une valeur prédéterminée, au moins un des deux éléments s'écarte pour que ledit premier élément 2 d'entraínement n'engrène plus ledit deuxième élément 3 entraíné.

According to the device according to the invention, the mechanical end-of-travel means are constituted by a clutch device 1 having at least:

• a first drive element 2, subject to the operating means, having a double slope radial toothing, a first slope 4 for meshing in a first direction of rotation, a second slope for meshing in a second direction of rotation,
• a second element 3 driven, subject to the transmission means, having a double slope radial toothing coinciding with the radial toothing of said first element 2 training,
• elastic means 6 for pressing the first element 2 and the second element 3 against each other at the level of their toothing, cooperating in such a way that when the torque transmitted by the first driving element 2 to said second element 3 is higher than a predetermined value, at least one of the two elements deviates so that said first element 2 training no longer meshes said second element 3 driven.

Thus, the end-of-travel means constituted by a device with a clutch are arranged between the actuating means and the means of transmission. They thus make it possible to protect the whole kinematic chain and mechanical ; thus according to the embodiment, crank, rod, joint, tip, axis of the flap, fastener and blades will be protected. The means of transmission such as in particular gear wheel and worm can then be made of plastic.

According to a variant, the first training element can take the form of a plate 2 having a double slope radial toothing pressed by elastic means 6 against a second element driven taking the form of a plate 3 provided with a double slope radial toothing.

According to another variant, for example, the first element of training can take the form of a tubular element in which is coaxially inserted a flexible tubular element of smaller diameter constituting the second element, as disclosed in the document CH-666 560. In this embodiment, the first tubular element can have a radial internal toothing in a double-slope crown, suitable for meshing with an external radial toothing of the second element driven tubular. The second tubular driven element can then have internal elastic means, as illustrated in document CH-666.560 and in particular at least one longitudinal groove, allowing the deformation of the external radial toothing of said second tubular element and allowing said external radial teeth to move away when the transmitted torque becomes too much important.

Radial toothing with a first and a second slopes to mesh in both directions of rotation allows when the design better determination of limit couples. Indeed, the couple limit depends on several parameters and more particularly the angle of each slope, the average radius of the toothing, the effort induced by the means elastic and friction coefficients of the materials used in level of the teeth. The importance of these parameters on the limiting torque will become clearer when describing Figures 2 and 3.

When designing, correspondence tables can be allow, depending on the slopes used, the average radius of the toothing, used materials and the elastic force to determine undit limit torque.

According to the invention, the device is able to present in limiting torque C ₁ in a first direction of rotation, distinct from a limiting torque C ₂ in a second direction of rotation.

According to the device according to the invention, the angle 7 formed between the action line 8 induced by the torque along said first direction of rotation and said first slope 4 is less than the angle 13 formed between the line of action 12 induced by the pair along said second direction of rotation and said second slope 5, so that the limiting torque C ₁ necessary for said first element 2 training no longer meshes said second element 3 driven in said first direction of rotation is less than the limit torque C ₂ necessary for said first drive element 2 no longer causes said second element 3 driven in said second direction of rotation.

By action line 8, 12 is meant by the couple, the right at the level of the teeth contained in a plane perpendicular to the axis of rotation of said clutch device 1 and perpendicular to a radius of the circle following the radial teeth.

As illustrated in Figure 2 or 3, such a line of action would be parallel to vector 8 or vector 9 illustrating the component of forces induced by the torque.

FIG. 2 illustrates the forces involved at the level of the toothing of the clutch device 1 according to the invention, at equilibrium, and for a limit torque C ₁ according to a first direction of rotation. In order to simplify the reasoning, we will not take into account the forces due to the friction between the materials.

As illustrated in Figure 1, the first element 2 drive engages the second element 3 driven following a first direction of rotation in the same sense as the vector 8.

At equilibrium and for a limiting torque C ₁ , only the slope 4 is subject to transmission forces. As illustrated in FIG. 2, the force F ₂₃ 14 represents the resultant of the forces of the first driving element 2 on the second element 3 which is driven.

The force F ₂₃ can decompose as the sum of the force F _e 9 induced by the elastic means and the force F _C1 8 due to the limit torque C ₁ induced by the operating means and the opposite resistance of the transmission means. The force F _R 10 then represents the resultant of the forces opposed to the force F ₂₃ . At equilibrium, for a limit torque, the force F ₂₃ 14 is perpendicular to the first slope 4. It can be deduced by simply projecting forces F _e 9 and FC ₁ 8 on an axis parallel to said first slope 4 that: F _C1 cos ₁ = F _e Sin  ₁ , the angle  ₁ representing the angle 7 formed between the action line 8 and the first slope 4 or the angle formed between the force FC ₁ 8 and the first slope 4.

Considering that the toothing is at an average distance of radius R ₁ from the axis of rotation, the approximation is reached that the limit torque C ₁ can be expressed as follows: VS 1 = R 1 x Sin  1 cos 1 F e

It is then understood that the limit torque depends on the angle  ₁ and the average radius R ₁ of the toothing as well as the forces F _e induced by the elastic means.

In the case of a zero slope ( ₁ = 0 °), the limit torque C ₁ is zero and in the case of a right angle slope ( ₁ + 90 °), this pair is theoretically infinite.

In theory, the efforts due should also be taken into account. friction between the materials, and the limit pairs would then be slightly higher.

In the same way, FIG. 3 illustrates the forces involved at the level of the toothing of the clutch device according to the invention at equilibrium and for a limit torque C ₂ in a second direction of rotation. In this case, only the slope 5 is subject to the transmission forces. We find the force F ₂₃ 24 which can be decomposed as the sum of the force F _C2 12 due to the limit torque C ₂ and the force F _e 9 due to the elastic means. One finds likewise the force F _R 26 opposed to the force F ₂₃ 24.

The diagram of Figure 3 is made on the same scale as the diagram of Figure 2 and for a force F _e 9 identical, that is to say, the same force induced by the elastic means. By simple construction, one realizes that the force F _C2 12 is superior to the force F _C1 8. This characteristic is confirmed by the formula of the limiting torque which is a function increasing in  on the useful interval. Thus, by choosing an angle  ₂ 13 greater than the angle  ₁ 7, a higher limit torque C ₂ is obtained in a second direction of rotation at the limit torque C ₁ in a first direction of rotation.

According to one embodiment, the first direction of rotation is the direction of downward actuation of the closing and opening device and in particular of said shutter, said second direction of rotation being the direction of actuation uphill. Indeed, in order to take into account the own weight of the closing and opening device, the limiting torque C ₂ of rise must be greater than the limiting torque C ₁ of descent.

According to one embodiment, the elastic means consist of Belleville washers 6 connected in series. Advantageously, the addition or removal of a said washer makes it possible to increase or decrease the forces of the elastic means and makes it possible to jointly adjust the limit torque C ₁ and the limit torque C ₂ .

According to another embodiment, the elastic means are constituted by a spring 6 '.

According to one embodiment, the transmission means of the closing and opening device are constituted by a wheel pair toothed 16 and worm 17 disposed in a housing 25.

Said toothed wheel 16 is secured in particular to the drum of rolling shutter, meshing with the worm 17. The worm 17 is actuated by the operating means by means of the clutch device.

According to one embodiment, said second element 3 driven is constituted by the worm 17 with the presence of a toothing radial at one of its ends, said first training element is having in the form of a pawl 2 located on the same axis of rotation of the According to a variant, this pawl is free to translate in a housing relative to the screw and deviates in the case of too much torque.

According to one embodiment, the ratchet 2 is pressed elastically against the worm 17 by means of Belleville washers mounted in series, one against the other, in a housing of the common housing to ratchet, adding or removing a Belleville washer jointly adjust the limit torque (s) in both directions of rotation.

Belleville washers also do not deteriorate the crankcase on which they rest, the latter being able to slide on one another in rotation.

According to one embodiment (FIG. 6), said pawl 2 and the screw endless 17 are traversed by the same polygonal tree, even fluted (not shown), said pawl 2 having a section opening polygonal 19 complementary or splined to said polygonal tree, or grooved, such that said pawl 2 is free in translation but blocked in rotation with respect to said polygonal shaft, said shaft constituting an axis of rotation for the worm 17.

According to another advantageous embodiment, illustrated in 7 to 11, the pawl is made using two parts, a sleeve 2 'and a ring 2 "having a radial toothing.

The sleeve 2 'is traversed by a polygonal or corrugated shaft of control and has for this purpose a hole of polygonal section 19 or groove in such a way that said sleeve 2 'is rotated by said polygonal or corrugated shaft.

The sleeve 2 'has moreover its circumference outer longitudinal grooves 30 cooperating with grooves conform to the inner circumference of said ring 2 "so as to rotate said crown. In this embodiment, said sleeve 2 'is preferably fixed in translation. By cons, said crown 2 "is able to move along the longitudinal grooves of said sleeve 2 '. Said sleeve 2 'has a shoulder 31 on which the elastic means 6 'support to press said ring 2 "against the radial toothing of said This advantageous embodiment makes it possible to prevent the resilient means 6 ', generally made of metal, do not rub against a wall of the casing 25, generally made of plastic material, and do not deteriorate latest.

According to an equivalent principle, another embodiment is illustrated in FIG. 12. According to this embodiment, the radial toothing 3 'of said worm 17 is free in translation relative to an extension 29 of said worm 17. Said extension 29 has a section polygonal, or fluted, adapted to cooperate with a polygonal section, fluted, in conformity 28 of the radial toothing 3 '. Thus, said toothing 3 ' is rotatably secured to said worm 17. Elastic means 6 such that in particular a spring rest on a shoulder of the worm 17 for pressing said radial toothing 3 'against the radial toothing of the pawl 2.

According to one embodiment, said device has braking means 20 cooperating with said worm 17. In order to prevent the descent including the shutter or the like under the action of his own weight, it is useful to integrate in the closing and opening device braking means. These means are particularly necessary in the case of a pair gearwheel 16 / worm 17 having a pitch between teeth and a no significant screws and making the transmission system reversible when the weight of the shutter apron is too high.

Advantageously, the braking means 20 act on the kinematic chain downstream of the interconnection means and more particularly at the level of the worm. This provision improves security and allows in particular to retain the shutter apron when the device of clutch decouples maneuver means of transmission means.

Thus, according to one embodiment, the braking means are constituted by resilient means 20 secured to said housing 25 and cooperating by friction at an extension 21 of said worm 17. In particular, they may be in the form of a shape spring conventional 20 secured to the housing 25 by two legs and tightened on a extension 21 of said worm 17.

Alternatively, the winch housing has fasteners symmetrical about the axis of rotation of said gear wheel 16. This feature makes it possible to use the casing in fixing to the right or to the left of a any trunk of rolling shutter or with a winding of the apron towards outside or inside the house.

Naturally, other modes of implementation of the invention, within the reach of those skilled in the art, could have been envisaged without however, outside the scope of the invention.

Claims (10)

Device for closing and opening (15) an opening, in particular a shutter, blind or the like, comprising a movable member such as in particular a shutter drum, operating means such as in particular a crank, means of transmission such as in particular a winch, and mechanical end-of-travel means, with torque limiter function, in both directions of rotation, characterized in that the mechanical end-of-travel means are constituted by a clutch device (1 ), showing at least: a first drive element (2), subject to the operating means, having a double slope radial toothing, a first slope (4) for meshing in a first direction of rotation, a second slope (5) for meshing with a second sense of rotation, a second element (3), driven, subject to the transmission means, having a double slope radial toothing coinciding with the radial toothing of said first element (2) training, elastic means for pressing the first element (2) and the second element (3) against each other at their teeth, cooperating in such a way that when the torque transmitted by the first driving element (2) to said driven second element (3) becomes greater than a predetermined value, at least one of the two elements moves apart so that said first element (2) d drive no longer engages said second element (3) driven, and in that the angle (7) formed between the action line (8) induced by the torque following said first direction of rotation and said first slope (4) is less than the angle (13) formed between the action line (12) induced by the torque along said second direction of rotation and said second slope (5), so that the limiting torque C ₁ necessary so that said first element (2) of training no longer meshes said second element (3) driven in said first direction of rotation is less than the limit torque C ₂ necessary for said first element (2) to drive engages plus said second element (3) driven in said second direction of rotation. Device according to claim 1, characterized in that said first direction of rotation is the direction of downward actuation of the closing and opening device and in particular of said shutter, said second direction of rotation being the direction of upward actuation. . Device according to claim 1, characterized in that the elastic means are constituted by Belleville washers (6) connected in series. Device according to claim 1, characterized in that the transmission means are constituted by a gear pair (16) / worm (17) disposed in a housing (25). Device according to claim 4, characterized in that said second element (3) driven is constituted by the worm (17) with the presence of a radial toothing at one (18) of its ends, said first element drive is in the form of a pawl (2) located on the same axis of rotation of the worm (17). Device according to claim 5, characterized in that said pawl (2) and the worm (17) are traversed by a same polygonal shaft, said pawl (2) having an opening of polygonal section (19) complementary to said polygonal shaft, such that said pawl (2) is free in translation but locked in rotation relative to said polygonal shaft, said shaft constituting an axis of rotation for the worm (17). Device according to claim 4, characterized in that said device has braking means (20) cooperating with said worm (17). Device according to claim 7, characterized in that the braking means are constituted by resilient means (20) secured to said housing and cooperating by friction at an extension (21) of said worm (17). Device according to claim 5, characterized in that said pawl (2) is composed of a ring (2 ") secured in rotation but free in translation relative to a sleeve (2 ') driven in rotation by the control means, said ring (2 ") being pressed against the radial toothing of the screw by means of elastic means (6) bearing on said sleeve (2 '). Device according to claim 5, characterized in that the radial toothing (3 ') of the screw is free in translation but secured in rotation relative to an extension (29) of said worm (17), the radial toothing (3 ') being pressed against the toothing of the pawl (2) by means of the elastic means (6).

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