ES2401673T3 - Lifting mechanism with a tightrope switch for a vertically mobile door - Google Patents

Abstract

Lifting mechanism for a vertically mobile door, whose lifting mechanism has at least one reel (32) for a flexible suspension element, such as a lifting cable (28), an axis (30) around which the reel (32) is mounted ), a motor (22) to rotate the shaft (30) and a loosening switch to stop the motor (22) when the tension of the suspension element decreases, whose loosening switch is arranged in connection with the reel (32) and has an element, which is mounted to rest against the suspension element that unwinds from the reel (32), the loosening switch being arranged to remain in a first position when the tension of the suspension element exceeds a predetermined threshold value and to move to a second position , which disconnects the motor function (22), when the voltage of the suspension element falls below the predetermined threshold value, characterized in that said loosening switch is arranged to move from the first position to the second position by rotating around a pivot pin (54) and said rotation is arranged to occur by means of the degrading force of the loosening switch.

Description

Lifting mechanism with a tightrope switch for a vertically mobile door.

The present invention relates to a lifting mechanism for a vertically mobile door, whose lifting mechanism has at least one reel for a flexible suspension element, such as a lifting cable, an axis around which the reel is mounted, a motor to rotate the shaft and a loosening switch to stop the motor when the lifting cable tension is reduced. The invention also relates to a vertically mobile door that is equipped with a lifting mechanism according to the invention.

Vertically mobile fabric doors are generally used as partitions in manufacturing spaces and as passage doors in ships and facilities. The vertically mobile fabric doors with two fabrics have an inner fabric and an outer fabric between which there are horizontal transverse reinforcements. On the upper edge of the vertically mobile door there is an upper housing, in which the lifting mechanism of the door and the motor belonging thereto are placed. On the lower edge of the vertically mobile door is a lower beam that is connected to the lifting mechanism with at least two ropes or lifting cables that move between the inner and outer fabrics. On the vertical edges of the vertically mobile door there are edge rails that guide the linear movement of the horizontal reinforcements and the lower beam. The vertically mobile door is opened by raising the lower beam upwards with the help of the lifting mechanism, whereby the horizontal reinforcements congregate on the lower beam and the inner and outer fabrics fold over different sides of the lower beam. The vertically mobile door is closed correspondingly by lowering the lower beam suspended on the ropes or lifting cables against the lower edge of the opening or the floor of the space.

Vertically mobile fabric doors are typically large. The width and height of a vertically mobile door that works, for example, as a partition in an industrial building or as the door of an aircraft hangar can be several meters, even tens of meters. Large vertically mobile doors are heavy, so special attention needs to be paid to the operational reliability and safety of use of the door lift mechanism. The vertically mobile fabric doors are thus equipped with a safety locking mechanism that prevents an uncontrolled fall of the door, for example due to the breakage of the ropes or lifting cables. In addition to the safety lock, the motor of the vertically mobile door lift mechanism can be equipped with an emergency stop mechanism that is activated in connection with a malfunction of the lift mechanism, such as breakage or loosening of a power cable. elevation.

A vertically mobile door is known from reference publication US 4368770, whose lifting mechanism comprises a reel placed in the center of the upper edge of the door, on which reel two lifting cables have been wound. Lifting cables pass through the upper corners of the door to the edges of the door and are attached to the lower beam of the door. In the upper corners of the door there is a loosening switch that makes contact with the lifting cable and stops the motor of the lifting mechanism when the tension of the lifting cable is reduced. The structure of the loosening switch has not been described in more detail in the reference publication.

US 2002/184824 A1 and WO 2008/048561 A2 describe lifting mechanisms of a vertically mobile door.

It is an object of the invention to provide a lifting mechanism for a vertically mobile door, in which the emergency stop of the lifting mechanism materializes in a safe and simple manner.

The objects of the invention are achieved with a lifting mechanism and a vertically mobile door according to independent claims 1 and 5. Some advantageous embodiments of the invention are presented in the dependent claims.

The lifting mechanism of the vertically mobile door according to the invention has at least one reel for a flexible suspension element, such as for a lifting cable. The reel is fixed around the axle so that it rotates with the motor. The lifting mechanism also contains a loosening switch to stop the motor when the tension of the lifting cable decreases. In the invention, the loosening switch is arranged in connection with the reel and has an element that is adapted to rest against the lifting cable that unwinds from the reel and to alter its travel line. The lifting cable directs a force component on the element that rests against it, whose force component keeps the loosening switch in a first position as long as the tension of the lifting cable exceeds a predetermined threshold value. When the loosening switch is in the first position, the motor of the lifting mechanism operates normally. When the tension of the lifting cable falls below the predetermined threshold value, for example as a result of the breakage or detachment of the lifting cable, the loosening switch moves to a second position, in which the motor function is disconnected: Loosening switch is arranged to move from the first position to the second position by rotating around a pivot pin. The rotation of the loosening switch takes place by means of gravity, when the energy stored in the loosening switch is released.

In an advantageous embodiment of the lifting mechanism according to the invention, the loosening switch comprises a first and second support arms that are fastened at its first end in a pivoted manner to the vertically mobile door structures. The element that rests against the lifting cable is a rod that is attached at its ends to the ends of the support arms, and the suspension element is adapted to move between the support arms on the rod.

Another advantageous embodiment of the lifting mechanism according to the invention further comprises a microswitch that has a detection element for detecting the position of the loosening switch. Said detection element is advantageously a detection rod that extends under the first support arm, whose detection rod activates the microswitch.

The vertically mobile door according to the invention has a door plate, at the lower edge of which there is a lower beam. The vertically mobile door has a lifting mechanism that has at least one reel for a flexible suspension element, such as a lifting cable. The suspension element is attached, at its first end, to the reel and, at its second end, to the bottom beam of the vertically movable door. The lifting mechanism also includes a shaft around which the reel is mounted, and a motor for rotating the shaft. The rotation of the shaft in a first direction of rotation causes the suspension elements to be wound on the reels, whereby the lower beam attached to the suspension element is raised upwards and the vertically mobile door is opened. Correspondingly, the rotation of the shaft in the second direction of rotation causes the suspension elements to unwind from the reels, whereby the lower beam descends downwards by means of gravity and the vertically mobile door is closed. The lifting mechanism also contains a loosening switch to stop the motor when the tension of the lifting cable is reduced. In the vertically mobile door according to the invention, the loosening switch is arranged in connection with the reel and has an element that is adapted to rest against the suspension element that unwinds from the reel and to alter its travel line. The tensioned suspension element directs a force component on the element that rests against it, whose force component keeps the loosening switch in a first position as long as the tension of the suspension element exceeds a predetermined threshold value. When the loosening switch is in the first position, the motor of the lifting mechanism operates normally. When the tension of the suspension element falls below the predetermined threshold value, for example, as a result of breakage or detachment of the suspension element, the loosening switch moves to a second position, in which the motor function is switched off: Said loosening switch is arranged to move from the first position to the second position by rotating around a pivot pin. The rotation of the loosening switch is designed to occur due to the force of gravity of the loosening switch.

In an advantageous embodiment of the vertically mobile door according to the invention, said loosening switch comprises first and second support arms that are fastened at its first end in a pivoted manner to the structures of the vertically mobile door. The element is a rod that is attached at its ends to the ends of the support arms, and the suspension element is adapted to move from the reel between the support arms on the rod to the lower beam.

In another advantageous embodiment of the vertically mobile door according to the invention, the lifting mechanism comprises several reels mounted around the axle, and an own loosening switch has been arranged in connection with each reel.

In another advantageous embodiment of the vertically mobile door according to the invention, this is a vertically mobile fabric door, advantageously a vertically mobile fabric door with two fabrics, which folds upwards.

An advantage of the lifting mechanism according to the invention is that it is structurally simple and functionally reliable. The loosening switch, which stops the motor of the lifting mechanism, operates without an external power source by means of gravity, which ensures its reliable operation.

An additional advantage of the invention resides in that its manufacturing costs are low.

Next, the invention will be described in detail. The description refers to the attached drawings, in which:

Figure 1 shows as an example a vertically mobile door according to the invention seen from the front,

Figure 2a shows as an example a lifting mechanism of a vertically mobile door according to the invention taken as a perspective view, and

Figure 2b shows the lifting mechanism of Figure 2a viewed from the side.

Figure 1 shows as an example a vertically mobile door according to the invention seen from the front. The vertically mobile door shown in Figure 1 is a so-called vertically mobile fabric door with two fabrics, which folds upwards and has a rectangular flexible door plate 10. The door plate 10 comprises two surface fabrics substantially parallel to a certain distance from each other, a first surface fabric 12 and a second surface fabric 14, and a plurality of horizontal reinforcements 16 between the first surface fabrics 12 and second 14. The horizontal reinforcements 16 are beam-like parts, preferably of aluminum, which are located in a horizontal position at a distance from each other. The surface fabrics 12, 14 are a PVC fabric reinforced with a polyester band or some other sufficiently durable cloth material suitable for this purpose. The surface fabrics 12, 14 are advantageously protected against fire, mold and UV light. On the lower edge of the door plate 10 there is a lower beam 18 similar to a box and on the upper edge of the door plate 10 there is an upper housing 20 in connection with which the lifting mechanism of the door plate is placed door 10. The lifting mechanism includes an axis that is substantially as long as the width of the door plate, around which the axis is reels, and a motor 22 for rotating the axis (the axis and the reels are not shown in the figure). Each reel has a lifting cable 28 that is attached at its second end to the lower beam 18. The operation of the lifting mechanism is controlled by a control center 24 that is placed next to the vertically movable door in the space wall. . On the vertical edges of the door vertically there are side rails 26a, 26b that guide the ends of the lower beam 18 and the horizontal reinforcements 16 to move them in the direction of the side rails 26a, 26b.

Figure 2a shows as an example the lifting mechanism of a vertically mobile door according to the invention taken as a perspective view. In order to better highlight the structure of the lifting mechanism, the wall of the upper housing 20 of the vertically mobile door has been partially removed. Figure 2b shows the lifting mechanism of Figure 2a viewed from the side, from the direction of the shaft end 30.

The lifting mechanism comprises an axis 30 around which cylindrical reels 32 have been mounted. The reels 32 are held to the axis 30 in a fixed manner, so that the rotation of the axis 30 generates the rotation of the reels 32. The axis 30 is rotated with the motor included in the lifting mechanism (the motor is not shown in the figure). The number of reels 32 depends on the width of the vertically mobile door. In narrow vertically mobile doors, two reels 32 are sufficient, one on each edge of the vertically mobile door. The vertically wider mobile doors need to be equipped with several reels 32. There may thus be 2, 3, 4, 5, 6, 7, 8 or more than eight reels 32, depending on the width of the door. The first end of the lifting cable 28 is attached to the reel 32 and the second end of the lifting cable 28 is attached to the lower beam 18 of the vertically movable door (Figure 1). The weight of the lower beam 18 generates a load on the lifting cable 28 which keeps the lifting cable 28 tense. The rotation of the shaft 30 in a first direction of rotation causes the lifting cable 28 to wind over the reels 32, whereby the lower beam 18 attached to the lifting cable 28 rises upwards and the vertically mobile door is opened. Correspondingly, the rotation of the shaft 30 in the second direction of rotation causes the lifting cable 28 to unwind from the reels 32, whereby the lower beam 18 descends downwards by means of gravity and the door is closed vertically mobile.

The shaft 30 is suspended from the upper housing 20 by means of support elements 34. The upper housing 20 is a C profile made of metal having at the free edges of its wings edges 42 pointing towards each other. The upper housing 20 of a functional vertically mobile door, when attached to the upper edge of the door opening or to the ceiling of the installation space of the vertically mobile door, is in the position according to Figure 2a, where the gap between it is between the edges 42 of the upper housing 20 points down. The support elements 34 have an upper support 36 similar to a plate and a lower support 38 that has substantially the same shape as the upper support 36. The upper support 36 and the lower support 38 are attached to each other, one on top of the other. , with fastening bolts 40, so that the edges 42 of the upper housing 20 are pressed between the upper supports 36 and lower 38 (Figure 2b). On the second surface of the lower support 38, whose surface points downwards in Figure 2a, there is a bearing housing 44, in the center of which is a bearing 46. The bearing 46 may be a sliding bearing, a ball bearing or a roller bearing In the center of the bearing 46 there is a hole, through which the shaft 30 passes. The number of support elements 34 depends on the length of the shaft 30, the number of reels 32 and the load of the lifting cables 28. There are advantageously two support elements 34 for each reel 32, whereby the support elements 34 are placed on both sides of the reel at a certain distance from the reel.

A loosening switch is arranged in connection with each reel 32 to monitor the tension of the lifting cable 28. The loosening switch has a first support arm 50a, which is placed next to the first end of the reel 32, and a second support arm 50b, which is placed next to the second end of the reel

32. The first ends of the support arms 50a, 50b are fastened with a pivot pin 54 (Figure 2b) to a fastening projections 56 which are attached to the upper housing wing 20. The pivot pin 54 is placed in the first side of the axis 30 at a certain distance from the axis 30, when viewed from the end of the axis 30 (figure 2b). The second ends of the support arms 50a, 50b are connected to each other with a rod 52 that is substantially parallel to the axis 30. The lifting cable 28 that unwinds from the periphery of the reel 32 moves between the support arms 50a , 50b on the rod 52 to the lower beam 18. The weight of the lower beam 18 generates a load on the lifting cables 28, whereby the lifting cable 28 strives to find its way to the vertical line that passes along the periphery of the reel 32 and the lower beam 18. The rod 52 fastens to the second ends of the support arms 50a, 50b sits under the reel, some distance in the lateral direction with respect to the vertical line passing through the periphery of reel 32 and bottom beam 18 of the vertically movable door. The tensioned lifting cable 28, loaded by the weight of the lower beam 18, rotates on the rod 52 and makes contact with its surface, that is, the rod 52 alters the travel line of the lifting cable 28, generating a curve in this. However, this curve generated in the lifting cable 28 is quite small, so that it causes significant friction that would increase the tension force of the lifting cable 28 or increase the load on the motor of the lifting mechanism. A horizontal force component is directed from the tensioned lifting cable 28 to the rod 52 that rests against it. This force component forces the rod 52 to move towards the other side of the shaft 30, when viewed from the end of the shaft 30, which causes the support arms 50a, 50b to rotate clockwise. around pivot pins 54. When the support arms 50a, 50b rotate, their center of gravity and the center of gravity of the rod 52 move upward, that is, potential energy is stored in them. In connection with the first ends of the support arms 50a, 50b there may be stops with which the rotation of the support arms 50a, 50b is limited clockwise, that is, in the direction of the first side of axis 30.

In FIG. 2b, the rod 52 and the support arms 50a, 50b drawn with a full line are in the first position, in which the lifting cable 28 is in the loaded tensioned position. If the lifting cable 28 breaks

or it comes off at its first or second end, its tension force disappears. Thus, no horizontal force component is directed from the lifting cable 28 to the rod 52, whereby the rod 52 and the supporting arms 50a, 50b rotate by means of gravity around the pivot pins 54 in the direction counterclockwise to the second position, in which the support arms 50a, 50b are almost vertical. When the tension in the lifting cable 28 is removed, the potential energy stored in the support arms 50a, 50b and in the rod 52 is thus released, which causes the loosening switch to turn towards the second position. This second one is shown in Figure 2b with dotted lines.

The lifting mechanism further includes a microswitch 60 that has a detection rod 62 extending under the first support arm 50a. In the first position of the lifting mechanism, the first support arm 50a remains above the detection rod 62, separated from the detection rod 62 due to the horizontal force component directed by the lifting cable 28 towards the rod 52. When the tension of the lifting cable 28 is significantly removed or decreased, the horizontal force component provided is thus removed, whereby the lifting mechanism is returned to the second position shown in Figure 2b with dotted lines. In this second position, the first support arm 50a presses the detection rod 62, which activates the microswitch 60. The microswitch 60 is connected with conductors to a control center 24 that controls the operation of the motor 22 belonging to the lifting mechanism. . The activation of the microswitch 60 sends a stop command to the control center 24, which stops the motor 22 which rotates the axis 30. Thus, all the reels 32 attached to the axis 30 stop, thereby stopping the movement of the door. Instead of a detection rod 62, the microswitch 60 may be equipped with some other measurement sensor or detection element that detects the position of the loosening switch.

In the lifting mechanism according to the invention, an own loosening switch is arranged in connection with each reel 32, whose loosening switch monitors the tension of the lifting cable 28 stored in the reel 32 in question. The lifting mechanism thus reacts immediately to a significant reduction in the tension of even a single lifting cable 28, stopping and blocking all the lifting cables of the vertically mobile door so that they remain motionless.

In the above description, the vertically movable door suspension element is a lifting cable 28 that is wound on a reel 32 of the lifting mechanism. It is obvious to someone skilled in the art that, instead of a cable, some other flexible structural part that is wound on a roller and resists tension, such as a rope, chain, string or lifting cable, can be used as the vertically mobile door suspension element.

Some advantageous embodiments of the lifting mechanism and the vertically mobile door according to the invention have been described above. The invention is not limited to the solutions described above, but the inventive idea can be applied in numerous ways within the scope of the claims.

Claims (7)

one.

 Lifting mechanism for a vertically mobile door, whose lifting mechanism has at least one reel (32) for a flexible suspension element, such as a lifting cable (28), a shaft (30) around which the reel is mounted (32), a motor (22) for rotating the shaft (30) and a loosening switch to stop the motor (22) when the tension of the suspension element decreases, whose loosening switch is arranged in connection with the reel ( 32) and has an element, which is mounted to rest against the unwinding suspension element of the reel (32), the loosening switch being arranged to remain in a first position when the tension of the suspension element exceeds a predetermined threshold value and to move to a second position, which disconnects the motor function (22), when the tension of the suspension element falls below the predetermined threshold value, characterized because said loosening switch is arranged to move from the first position to the second position by rotating around a pivot pin (54) and said rotation is arranged to occur by means of the gravity force of the loosening switch.

2.

 Lifting mechanism according to claim 1, characterized in that said loosening switch comprises a first and second support arms (50a, 50b), which are fixed at its first end in a pivoted manner (54) to the structures of the vertically mobile door , and the element is a rod (52), which is fixed at its ends to the ends of the support arms (50a, 50b), the suspension element being mounted to move between the support arms (50a, 50b) on the rod (52).

3.

 Lifting mechanism according to claim 1 or 2, characterized in that it further comprises a control center (24) for controlling the operation of the motor (22) and a microswitch (60) connected to the control center

(24) to stop the motor (22) when the microswitch (60) is activated, whose microswitch (60) has a detection element to detect the position of the loosening switch.

Four.

Lifting mechanism according to claim 3, characterized in that said detection element is a detection rod (62), which extends below the first support arm (50a) and activates the microswitch (60).

5.

 Vertically mobile door, which has a door plate (10), a lower beam (18) and a lifting mechanism as disclosed in any of claims 1 to 4, wherein the suspension element is fixed at its second end to the lower beam (18).

6.

 A vertically movable door according to claim 5, characterized in that the lifting mechanism comprises several reels (32) mounted around the axis (30) and an own loosening switch has been arranged in connection with each reel (32).

7.

 Vertically mobile door according to any of claims 5-6, characterized in that it is a vertically mobile fabric door, advantageously a vertically mobile fabric door with two fabrics (12, 14), which folds upwards.