FR2997435A1 - MANEUVER MECHANISM FOR SECTIONAL DOOR APRON AND DOOR HAVING THE SAME - Google Patents

Abstract

The operating mechanism for a sectional door apron comprises on a frame (20) a drive member (21) having a rotary output shaft (210) and a motion transmission (22) between the shaft outlet (210) and the drive shaft (12) of the door leaf. The motion transmission (22) is formed of a first trapezoidal groove pulley (220), coupled to the drive shaft (12), of a second trapezoidal groove pulley (221) coupled to the drive shaft (22). outlet (210) and an endless belt (222) of trapezoidal cross-section engaged in the grooves of the two pulleys. The belt (222) cooperates with a tensioning means arranged in clutch and can occupy an engaged state in which the belt (222) is stretched between the pulleys and a disengaged state in which the belt (222) is relaxed.

Description

MANEUVER MECHANISM FOR SECTIONAL DOOR APRON AND DOOR COMPRISING IT Technical field. The present invention is in the field of equipment used to operate the deck of a sectional door between an open position and a closed position and vice versa and relates to a drive mechanism of the drive shaft of this deck. State of the art It is known that sectional doors are in particular intended to equip the openings in the walls of buildings for professional use and are typically formed of a guiding and holding structure fixed against the edge of the opening of the building and an apron movably engaged in the guide structure. This guide structure is usually formed of two vertical rails fixed at the edge of the opening.

The apron is formed of a plurality of panels hinged together according to their horizontal borders. The apron is maneuvered along the rails by a motorization usually consisting of two cables wound on two drums mounted to fix on the same horizontal drive shaft engaged in guide bearings fixed to the wall above the opening. The drive shaft is coupled to an electric gear motor attached to one of the elements of the guide structure. Usually, the geared motor occupies a lateral position with respect to the guide structure and protrudes with respect to the latter. More specifically, the geared motor is disposed at the end of the shaft and is coupled to the latter. These geared motors often have a relatively large footprint that does not allow their implementation in reduced spandrels. By corner you must hear the horizontal distance between the deck and the angle of the wall. But sometimes such a distance is reduced to a few centimeters and is therefore insufficient to receive the gearmotor. Usually, the reduction ratio of the geared motor is relatively high which prohibits or makes particularly difficult the operation of the deck by hand in case of power failure. However, the basic safety rules impose the possibility of operating the deck in the absence of any power supply to the geared motor. For this reason, on the drive train between the output shaft of the gearmotor and the drive shaft of the deck, is often arranged a manually operated clutch. This clutch has the effect when inactive, to release the drive shaft of the deck and allow the free movement of lifting or lowering of the latter. A clutch mechanism for a sectional door is described in US Pat. No. 5,581,939. This clutch mechanism essentially comprises two coaxial coupling hubs, the first of which, fixedly mounted, is in permanent coupling relation with the coupling. drive shaft and whose movably mounted second is in permanent coupling relation with the output shaft of the electric motor. By axial displacement, the second hub is brought into engagement with the second hub to ensure a transmission of torque and movement or is released to break this transmission and release the drive shaft. The axial displacement of the second hub between its two positions, coupled and uncoupled, is provided by an articulated operating arm manipulated by an operator. In order to allow this movement, the second hub has a groove in which is engaged the upper end of the operating arm, the latter, in the lower part receiving a handle. To transmit a sufficient force capable of overcoming the possible mechanical resistances due to seizure phenomena, the operating arm is arranged as an inter-support lever and the distance between its upper end and its axis of articulation is much smaller than the distance between this same axis and the handle. In this arrangement, the lever is angularly movable in a vertical plane, parallel to the drive shaft, and the distance to be traveled by its lower end to move the second hub from one position to the other is relatively important and requires a sufficient stool value.

Other geared motors are equipped with emergency maneuvering means by chain or cable, but an operation of the door apron with such means is particularly long and tedious. Thus, such geared motors, for obvious safety reasons, are not used for the operation of door aprons of emergency center premises or security centers or other premises. Presentation of the invention. The object of the present invention is to solve the drawback mentioned above by proposing an operating mechanism for a sectional door with a low or zero sparse value. Another object of the present invention is to provide an operating mechanism incorporating simple and effective disengaging means allowing a quick manual operation of the door apron. For this purpose, the operating mechanism for door leaf with vertical opening and closing movement, comprising on a frame, a motor member provided with a rotary output power output shaft and a motion transmission associated with the shaft. output of the drive member, adapted to transmit movement and torque to the drive shaft of the door leaf, is essentially characterized in that the motion transmission is formed of a pulley driven trapezoidal groove, provided to be coupled to the drive shaft of the deck, a driving pulley trapezoidal groove coupled to the output shaft of the drive member and an endless belt, of trapezoidal cross-section, engaged in the grooves of the two pulleys and that said belt cooperates with a tensioning means arranged in clutch and can occupy an engaged state in which the belt is tensioned and a driving torque can be transmitted from the a driving pulley to the driven pulley and a disengaged state in which the belt is relaxed and no driving torque can be transmitted to the driven pulley. Thanks to these provisions, the drive member and the clutch no longer occupy an axial alignment position with the transmission shaft but a lateral position which reduces the bulk. A door equipped with such a drive mechanism, can then equip openings without spars or reduced spandrels. According to another characteristic of the invention, the tensioning means comprises: a support structure belonging to the frame, on which is mounted the driving member, this support structure being movable between a first position or clutch position according to which the belt is tensioned and a second position or declutching position according to which the belt is relaxed and no torque can be transmitted between the pulleys, said support structure being biased to a disengagement position by an elastic return member, - an arm clutch extending downwards, forming a lever, fixed to said support structure, by action on which said support structure is biased towards its engaged position and against the action exerted by the elastic return member . The multiplier lever arrangement of the clutch arm makes it possible, from a calibrated force of moderate intensity, applied on the latter to generate a tension of the belt sufficiently high to induce a limited drive torque. in value, sufficient to ensure the driving of the deck under normal conditions of use, and insufficient to ensure this training in the presence of an obstacle on the path of the deck. In this situation, the tension of the belt is insufficient to ensure the transmission of torque between the driving pulley and the driven pulley. The value of this maximum torque will be chosen so as not to hurt any person who is inadvertently or accidentally on the path of the deck. It will thus be understood that the chosen mode of transmission with pulleys and belts is also a fuse means in that, from a certain value of torque, for a given belt tension, this belt no longer drives and slides in the gorges pulleys leading and led.

In combination with this characteristic, the motor unit is controlled by an appropriate electronic circuit which continuously measures, or at regular time intervals, the value of the driving torque and the limit, by interrupting the power supply of the motor unit, at a value well below that induced by the tension of the belt. It is understood that the electronic control circuit introduces additional safety factors and that its failure will have no detrimental effect for the safety of persons inadvertently under the path of the deck. According to another characteristic of the invention, there is provided a means for actuating the clutch arm towards its clutch position. This actuating means induces a multiplier effect and facilitates the maneuvering of this arm. According to another characteristic of the invention, the actuating means of the clutch arm comprises an actuating lever and a force transmission meshing with the actuating lever capable of transmitting a radial force of clutch to the arm clutch. According to another characteristic of the invention, the transmission of force comprises a clutch cable attached by one of its ends to the actuating lever and an elastic member fixed on the one hand to the clutch cable and on the other hand at the clutch arm. This elastic member, consisting of a coil tension spring limits and calibrates the intensity of the force applied to the clutch arm to bring it and maintain it in its engaged state. Another advantage of the use of a spring is to compensate for the wear that causes the elongation of the belt over time. According to another characteristic of the invention, the drive pulley is associated with a thrust heel, fixed to the support structure, said thrust heel, in the disengaged position, being able to act on the belt to force the latter to remain in position. drive pulley groove and move away from the flanks of the driven pulley groove. Alternatively, the thrust heel is associated with the driven pulley and the clutch and disengagement functions are performed at the driving pulley. The invention also relates to a sectional door. This door is essentially characterized by an operating mechanism according to the invention. Brief presentation of figures and drawings. Other objects, advantages and features of the invention will appear on reading the description of a preferred embodiment given by way of non-limiting example with reference to the accompanying drawings, in which: FIG. front view of a sectional door equipped with a drive mechanism according to the invention, - Figure 2 is a side view of the sectional door according to the invention, the drive mechanism being engaged, - the Figure 3 is a side view of the sectional door according to the invention, the drive mechanism being disengaged. Best way to realize the invention. The attached figures show a sectional door comprising a guide structure 10 in which is slidably mounted an apron 11 formed of several panels hinged together according to their horizontal edges. This sectional door is provided in the upper part with a horizontal drive shaft 12, mounted on bearings, to which are fixed two or more drums 13 for winding traction cables 14 fixed at their lower end to the deck 11 of the door. The drive shaft 12 is kinematically associated with an operating mechanism 2 according to the invention. The guide structure 10 is essentially formed of two keys bordering the jambs of the opening of the door and two vertical guide rails fixed to the two keys. In the upper part, the two rails may each be extended by a bent segment of guide rail followed by a horizontal or inclined segment of guide rail. The operating mechanism 2 according to the invention comprises on a frame 20 on the one hand a motor member 21 of the type of those having a rotary output shaft 210 of power take-off and on the other hand a transmission of movement 22 between output shaft 210 of the drive member 21 and the drive shaft 12 of the deck 11 of the sectional door. It may be noted that the motion transmission 22 develops in a direction perpendicular to the drive shaft 12 and no longer in an axial direction which reduces the bulk. Similarly, the motor member 21 no longer occupies an axial alignment position with the drive shaft 12 but a lateral position to the latter which further reduces the bulk. Thus it becomes possible to motorize aprons 11 equipping door openings with low spandrels or stool does not exist. In the preferred embodiment, the frame 20 is secured by bolts or other attachment to one of the keys of the guide structure. This frame is formed of at least one vertical flank receiving in fixing the motor member 21. This motor unit is preferably constituted by a DC electric gear motor, known per se, fixed by bolts to the vertical flank forming the frame 20 This flank is provided with a through-opening for the passage of the output shaft 210 of the motor member 21. The transmission of movement 22, between the output shaft 210 of the geared motor and the drive shaft 12, is formed of a driven pulley 220 trapezoidal groove, coupled to the drive shaft 12 of the deck, a driving pulley 221 trapezoidal groove coupled to the output shaft 210 of the drive member and a endless belt 222, trapezoidal cross-section, engaged in the grooves of the two pulleys 220 and 221. As can be understood, the driving pulley 221 rotates the driven pulley via the endless belt 222 and transmits a driving couple and u no motive power. According to the preferred embodiment, the driving pulley 221 has a diameter smaller than that of the driven pulley 220. This results in a reduction in the rotational speed of the driven pulley 220 and consequently an increase in the torque available on this driven pulley 220. pulley. According to a first embodiment, the frame 20 comprises a bearing in which is engaged the drive shaft 12, the latter emerging from the bearing to receive the driven pulley 220. Alternatively, according to a second embodiment, the driven pulley 220 is mounted on a coupling sleeve engaged in a ball bearing carried by the frame 20. This coupling sleeve is adapted to cooperate in coupling relation with the drive shaft 12 of the deck. The coupling relationship can be established by complementary grooves of the sleeve and the drive shaft, adapted to cooperate in shape interlocking with each other. The use of trapezoidal pulleys and a suitable belt makes it possible in a simple and inexpensive way to transmit relatively large torques of the driving pulley towards the driven pulley, and with very little slippage of the belt 222 in the pulleys. grooves pulleys 220 and 221. However, such an arrangement requires the use of a tensioning means of the belt 222 for proper operation. Advantageously, according to a characteristic of the invention, the tensioning means is arranged in clutch and can occupy an engaged state in which the belt 222 is tensioned and a power and a rotational movement can be transmitted from the driving pulley 221 to the driven pulley 220 and a disengaged state in which the belt 222 is relaxed and no power and rotational movement can be transmitted to the pulley 220 and the drive shaft 12, the latter then being free to rotate. Thus in disengaged configuration, the deck 11 of the door can be operated manually by an operator knowing that the drive shaft 12 cooperates with compensation springs to balance the weight of said deck.

In the preferred embodiment, the tensioning means comprises a support structure 20a belonging to the frame 20, on which is mounted the motor member 21, this support structure 20a being movable between a first position or clutch position according to which the belt 222 is tensioned and a second position or declutching position in which the belt 222 is relaxed, said support structure being biased towards the disengaging position by an elastic return member 23. Additionally, the tensioning means comprises an arm clutch 24 extending downwards, by action on which said support structure 20a is biased towards its engaged position and against the action exerted by the resilient return member 23. Preferably this member return spring 23, in the form of a tension spring with turns, is arranged in tension between an element of the guide structure 10 and the clutch arm 24 or b is the support structure 20a. Still according to a preferred embodiment, the constituent flank of the frame 20 is formed of two cooperating flank portions, one 20b is fixed and receives the bearing of the drive shaft 12 or the coupling sleeve and whose the other is movable and receives in fixing the motor member 21, this movable portion constituting the support structure 20a mentioned above. The driven pulley 220 is associated with the fixed portion 20b of flank while the driving pulley 221 is associated with the movable portion 20a flank. Advantageously, the movable flank portion, that is to say the support structure 20a mentioned above, is articulated to the fixed portion 20b of flank along a horizontal axis parallel to the axes of rotation of the driven pulleys 220 and leading 221 and spaced apart. these latter. Thus, the tensioning of the belt 222 is effected by simple pivoting in one direction of the support structure 20a, which greatly simplifies the production of the operating mechanism, this pivoting in the considered direction leading to the separation of the axes of rotation of the two pulleys, one of the other. Pivoting in the other direction leads to bringing the axes of rotation of the two pulleys together and to relax the belt. The clutch arm 24 is bolted to the support structure 20a and extends downwardly. This arm 24, at a distance from the axis of articulation of the support structure 20a, at its end receives a radial clutch force. Preferably, the clutch arm 24 is arranged as a lever multiplier so that the force applied to it for the clutch is transmitted amplified, for example in a ratio of one for eight, to the belt 222 so to tighten the latter and to ensure the clutch function. This radial clutch force is applied to the arm 24 by means of manual actuation maneuverable by an operator. This actuating means is configured capable of amplifying the effort exerted on it by the operator, with a view to actuating the arm 24, and transmitting it to this arm in an amplified manner. Such an arrangement facilitates the operation of the clutch arm 24 in the direction of the clutch. According to a practical embodiment, the actuating means of the clutch arm 24 comprises an operating lever 26 articulated to the guiding structure 10 and a transmission of force engaged with the operating lever and capable of transmitting the clutch. This force transmission is constituted by a clutch cable 25 connected to the operating lever 26. Advantageously, this radial force is transmitted to the clutch arm 24 by the clutch arm 24. by means of an elastic member 27, biased in tension, constituted for example by a tension spring 27 with contiguous turns at rest. Such an arrangement is intended to limit and calibrate the intensity of the force applied to the clutch arm 24 and consequently to limit the degree of tension of the belt 222 to the value necessary and sufficient for correct operation. . This avoids any risk of damage to the belt 222 by excessive tension. Such an arrangement also determines a calibrated tension value for the belt 222, this tension value depending on the intensity of the tensile force exerted by the spring 27 on the clutch arm 24 and more particularly on the intensity of the tension. the normal component to this arm, this tensile force. The value of the tension of the belt 222 also depends on the moment of this tensile force relative to the axis of articulation of the support structure 20a. the value of the tension of the belt 222 determines the maximum value of the torque that can be transmitted to the drive shaft 12 and is chosen accordingly, so that the value of this torque is sufficient for the drive of the deck 11 in normal conditions of use and is instead insufficient for driving the driven pulley in the presence of an obstacle on the path of the deck 11. In this situation, the belt 222 must be able to slip in the grooves of the pulleys 220, 221. avoids that people who would be inadvertently or by accident under the deck 11 are injured by the latter under the effect of too much thrust force. To further strengthen this safety arrangement, the geared motor 21 is associated with an electronic control and control circuit capable of measuring the value of the electric current consumed by the geared motor and to compare this value with one or more setpoints. More specifically, the electronic control circuit is able to determine the position of the deck 11 relative to one of its fully closed or fully open positions from data delivered by a distance counter driven by the output shaft. of the gearmotor, to measure, for each position of the deck, the value of the current consumed and to compare this value with a preset setpoint curve. In the case of over-consumption of current, during the lowering of the deck 11 for example, the electronic control circuit will first control the stopping of the gearmotor 21 and thus the stopping of the deck 11 and immediately after activate this gearmotor 21 in the direction the rise of the deck 11. An over-consumption of the geared motor 21, detected during the ascent of the deck 11, will cause the stop gearmotor 21 and consequently the stopping of the deck 11.

The operating lever 26 constituting the force transmission, is of the inter-resistant type and is articulated by one of its two ends to the corresponding key of the guide structure 10 of the apron 11. At its other end, this lever is endowed of a handle. The clutch cable 25 at its corresponding end is fixed to the lever and is engaged on a return element 29 integral with the corresponding key. This operating lever 26 is adapted to cooperate with two fixed locking members 28, spaced apart from each other, embodying the engaged and disengaged positions.

In a preferred embodiment, the locking member 28 is constituted by a vertical lever system 26 fixed to the corresponding key. To lock the motor drive in the disengaged or engaged position by a latch system allowing a balance position when the cable is tensioned to maintain the clutch function.

According to the preferred embodiment, the clutch arm 24 is engaged in the guiding gap between two elements of the guiding structure 10 so as to be guided and held laterally and at a distance from the axis of the clutch. articulation of the structure 20a. Such an arrangement avoids twisting of the support structure 20a. In the preferred embodiment, one of the elements of the structure may be the corresponding guide rail, and the other structural element may be constituted by a rigid rectilinear metal section fixed to the rail that comprises the guide structure and this spacing of the latter to provide the guiding interval mentioned above. In the disengaged position of the lever 26, the clutch cable 25 is expanded and the guide structure 20a is held in the disengaged position by the spring 23. In this position, the belt 222 is relaxed due to the reduction of the distance between the pulleys 220, and 221. In order for this belt 222 in this position to be systematically spaced from the faces of the groove of the driven pulley 220, a thrust heel 223 in the form of an arc flange of circular circumference is associated with the driving pulley 221 and partially surrounds the latter. This thrust heel 223 is attached to the support structure 20a. In the disengaged position, this thrust heel 223 acts on the belt 222 and more particularly on the part of the latter wound in the groove of the pulley 221, which forces the belt 222 to move away from the faces of the groove of the pulley 221. pulley 220 without leaving said groove. To further enhance this effect, the thrust heel can be extended towards the driven pulley 220 by two straight flanges 224 provided to limit the deformation of the two straight strands of the belt 222.

Claims (9)

CLAIMS1 / Operating mechanism for sectional door apron, comprising on a frame (20) a motor member (21) having a rotary output power output shaft (210) and a motion transmission (22) associated with the output shaft (210) of the drive member, adapted to transmit movement and torque to the drive shaft (12) of the door leaf, characterized in that the motion transmission (22) is formed a first pulley (220) having a trapezoidal groove, adapted to be coupled to the drive shaft (12) of the apron, of a second pulley (221) having a trapezoidal groove coupled to the output shaft (210) of the drive member (21) and an endless belt (222) of trapezoidal cross-section, engaged in the grooves of the two pulleys (220 and 221) and that said belt (222) cooperates with a means for setting tension arranged in clutch and can occupy an engaged state in which the belt (222) is tensioned and a c orple can be transmitted from the driving pulley (221) to the driven pulley (220) and a disengaged state in which the belt (222) is relaxed and no torque can be transmitted to the pulley (220). 2 / operating mechanism according to the preceding claim, characterized in that the tensioning means comprises: - a support structure (20a) belonging to the frame (20), on which is mounted the motor member (21), this structure carrier (20a) being movable between a first position or clutch position in which the belt (222) is tensioned and a second position or disengagement position in which the belt (222) is relaxed and no torque can be transmitted between the pulleys, said support structure being biased towards a disengagement position by an elastic return member (23), - a clutch arm (24) extending downwards, fixed to said structure, by action on which said structure support (20a) is biased towards its engaged position and this against the action exerted by the elastic return member 30 (23). 3 / operating mechanism according to the preceding claim, characterized in that the frame (20) is formed of at least one vertical flank formed of two cooperating flank portions, one of which (20b) is fixed and is associated with led ledge (220) and the other is movable and receives in fixing the motor member (21), said movable portion constituting the support structure (20a). 4 / operating mechanism according to the preceding claim, characterized in that the movable portion (20a) flank, that is to say the support structure (20a) is articulated to the fixed portion (20b) flank along an axis horizontal parallel to the axes of rotation of the driven and driving pulleys (220, 221), that the values of the normal distances between the axis of articulation of the support structure 20a) and the axes of rotation of the two driven and driving pulleys (220, 221) are smaller than the value of the distance between the two pulleys (220, 221). 5 / operating mechanism according to any one of claims 2 to 4, characterized by a means for actuating the clutch arm to its clutch position. 6 / operating mechanism according to the preceding claim, characterized in that the actuating means of the clutch arm (24) comprises an actuating lever (26) hinged and a transmission of force engaged with the lever of actuation (26) adapted to transmit a radial clutch force to the clutch arm (24). 7 / operating mechanism according to the preceding claim, characterized in that the force transmission comprises a clutch cable (25) fixed at one end to the actuating lever (26) and a resilient member (27) fixed on the one hand to the clutch cable and on the other hand to the clutch arm (24). 8 / operating mechanism according to any one of claims 2 to 7, characterized in that the driving pulley (221) is associated with a thrust heel (28), fixed to the support structure (20a), said heel of thrust in the disengaged position being able to act on the belt (222) to force the latter to move away from the flanks of the groove of the driven pulley (220). 9 / operating mechanism according to any one of the preceding claims, characterized in that the motor member (21) is controlled by an electronic circuit capable of measuring permanently or at regular time intervals, the value of the drive torque and to limit it, by interrupting the power supply of the motor unit, to a value lower than that induced by the tension of the belt (222) .10 / Sectional door comprising a guide structure (10) slidably receiving an apron (11) actuated by cables (14) wound on drums (13) fixed on a horizontal shaft (12) mounted on bearings, characterized in that said drive shaft (12) is kinematically associated with a mechanism operating mechanism according to any one of the preceding claims. 11 / Door according to the preceding claim, characterized in that the transmission of movement (22) of the operating mechanism is radial to the drive shaft (12) and the drive member (21) is lateral to said shaft (12). ).