FI96355B - rolling Shutter - Google Patents

Abstract

A roll-up door comprises a flexible door leaf (1) which is rolled up round an upper roller (2) and which, when unrolled therefrom, closes a door opening. A motor turns the roller (2) in both the unrolling and the rolling-up direction. Two upper pulleys (4), which are coaxial with the roller (2), are disposed one at each end of the roller so as to turn with the roller. Two ropes (6), each travelling over a lower pulley (5) provided in the lower part of the door opening, are, at one end, fixed to the free end of the door leaf (1) and, at the other end, fixed to an upper pulley (4) each, so as to be rolled up round the upper pulley when the roller (2) is turned in the unrolling direction and be unrolled from the upper pulley when the roller is turned in the rolling-up direction. The two upper pulleys (4) are of larger diameter than the roller (2). The upper pulleys (4) are connected to the roller (2) by a spring means (7) which is adapted, when the roller (2) is turned in the unrolling direction, to entrain the two upper pulleys (4) in this movement. The spring means (7) is so mounted that its spring tension increases when the roller (2) is thus turned owing to the fact that the upper pulleys (4) turn more slowly than the roller because of the difference in diameter.

Description

96355

rolling shutter

The present invention relates to a roller door having a flexible door leaf wound on a roll on an upper roll 5, which, when unloaded from the roll, closes the door opening, a motor for rotating the roll in both unwinding and rotating directions, two coaxial camshafts at each end of the roll to rotate therewith, and 10 two ropes, each passing over a lower pulley located at the bottom of the doorway, both ropes being attached at one end to the door leaf at its free end and at the other end to the upper rope pulley, when the roll is unwound -15 in the winding direction, the ropes are wound on the upper pulley and, when the roll is rotated on the reel in the direction of rotation, they are unwound from the upper pulley.

It is an object of the present invention to provide a roller door with a particularly simple device for stretching the door leaf into a fully or partially open space, increasing the tensile force provided by the device as the degree of unloading increases, and further enabling the weight of the door leaf to be balanced pu-25 without falling down or rewinding on a roll.

This object is achieved by a roller door as described above, which according to the present invention is characterized in that both upper rope pulleys have a larger diameter than the roll and are fixed to the roll by a spring means adapted as the roll rotates in the unwinding direction to bring both upper rope pulleys rotational movement, the spring means being mounted so that its spring tension increases during said rotation of the roll due to the fact that the upper pulleys rotate more slowly than the shaft as a result of the difference in diameter.

96355 2

The invention will now be explained in more detail with reference to the accompanying drawing.

Fig. 1 is a schematic side view showing a roller door according to the invention with the door panel in a partially open state.

Figure 2 corresponds to Figure 1 but illustrates the door panel in a state where it is more open than in Figure 1.

Figure 3 is a schematic side view showing an alternative embodiment of a roller 10 door according to the invention.

The roller door shown in Figures 1 and 2 has a door leaf 1 of flexible material, for example a fabric covered with plastic coatings. The door plate 1 is supported by an upper roller 2, which is placed above the door opening (not shown) and whose shaft 3 is rotatably mounted on a side stand (not shown). The door plate 1 is wound on a roller on a roll 2 so that when opened from the roller it closes the door opening. The roller 2 can be rotated both in the direction of unwinding from the roll and in the direction of rotation on the roll by means of a motor 20 (not shown) arranged to rotate the shaft 3.

The two upper pulleys 4, the diameter of which is larger than the roll 2, are supported by freely rotating shaft 3 on both sides of the roll 2. The two lower pulleys 5 are located in the lower part of the door opening directly below each of the upper 25 pulleys 4. The rope 6 passes over each rope pulley 5 and is attached at one end to the door leaf 1 at its free end edge and at the other end directly above the upper pulley 4 so that as the roll 2 rotates from the roll to the unwinding and to the unwinding from the upper pulley 4.

Both upper pulleys 4 are attached to the roll 2 by a spring 7, which for the sake of clarity is described by a tension spring 35 mounted outside the roll 2 and on the corresponding pulleys 4. The spring can, as experts know,

II

96355 3 be any type of spring capable of performing the function described in more detail below.

The springs 7 are mounted on the roller and the rope reel so that when the roller is rotated in the unwinding direction, they engage the rope pulleys 4 in that rotation at the same time as their spring tension increases during that rotation, as will be explained in more detail below.

When the door leaf 1 is further opened from the partially opened state shown in Fig. 1, the shaft 3 and with it the roll 2 turn clockwise (Fig. 1) by means of a motor. Thus, a certain part of the door plate 1 is unwound from the roll 2, while the same length of rope 6 is wound on each pulley 4. During this turning of the roll 2, the springs 7 cause the pulleys 4 to turn. However, since the diameter of the rope pulleys 15 is larger than that of the roller 2, the rope pulleys do not rotate as much as the roller 2, which causes the springs 7 to tension the further the further the rotation of the roller 2 continues. This situation is illustrated by the reference mark 8 and the reference mark 9 drawn on both the roller 2 and the pulley 4, respectively. These reference marks 8 and 9 are opposite to each other when the door plate 1 is in the partially opened state shown in Fig. 1. When the door leaf part L is released from the roller 2, the roller has turned clockwise to the state shown in Fig. 2, where, as shown in Fig. 25, the reference mark 8 on the roller 2 is slightly above the reference mark 9 on the pulley 4. As also shown in Fig. 2, the spring 7 is stretched about.

As should be apparent from the above, the springs 7 30 stretch the door leaf 1 through ropes 6 attached to the free end edges of the door leaf 1, whereby the tensile force produced by the springs 7 increases each time the door leaf 1 is opened. 2 and the diameter of the wheels 4 of the rope 35. As will also be seen, the springs 96 ensure, when suitably selected as described above, that the weight of the door leaf 1 is balanced so that the door leaf either remains in place without falling or is wound on the roll 2, if the engine were to shut down, for example, during a power failure.

Compared to the embodiment shown in Figures 1 and 2, Figure 3 shows a space-saving roller door which requires very little space outside the wall into which the door opening is formed. The roller door according to Figure 3 differs from the roller door according to Figures 1 10 and 2 only in that a steering wheel 10 is placed on each rope 6. The steering wheel 10 is placed slightly below the upper rope pulley 4 and is closer to the wall. The lower pulleys 5 are also moved closer to the wall and placed directly below the guide pulleys 10.

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Claims (1)

96355 Claim: A roller door with a flexible door leaf (1) wound on a roll on an upper roll (2), which, when unloaded by the roll 5, closes the door opening, the motor for rotating the roll in both the unwind and roll directions, two rollers a coaxial shaft, an upper pulley (4) arranged at each end of the roll to rotate therewith, and two ropes (6) each passing over a lower pulley (5) located at the bottom of the door opening, both ropes (6) being attached at one end to the door plate (1) at its free end and at the other end to the upper rope pulley (4), whereby when the roll (2) is rotated from the roll 15 in the unwinding direction, the ropes are wound on the upper rope pulley and when the roll is rotated on the roll unloaded from the upper rope pulley, characterized in that the diameter of both upper rope pulleys (4) is larger than the roll (2) and that they are fixed to the roll by means of a spring means (7) adapted to rotate both rollers (4) in said rotational movement as the roll (2) rotates in the unwinding direction, the spring means (7) being mounted so as to increase its spring tension (2) during that • I 25 rotation due to the fact that the upper rope pulleys (4) rotate slower than the roller due to the difference in diameter. 6 96355 Rullport, vilken har ett böjligt portblad (1), som är upprullat päen Övre Vals (2), varvid detta vld avrull-5 Ning frän valsen tillsluter en portöppning, en motor för kringvridning av valsen i säväl avrullnings- som upprull- a ring, which is made up of a roll of coaxial rollers, a pair of rollers (4), a pair of rollers (6), a piece of rollers (5), a pair of rollers (5) -gens nedre parti, varvid de bäda linorna (6) vid sin ena ände är fästa pä portbladet (1) vid dettas fria ände och vid sin andra ände är fästa pä varsin Övre linrulle (4), varvid linorna vid valsens (2) kringvridning in the case of roll-15 rolls on the rollers and rollers in the roll-on rolls on the rollers, the rollers of the roll-on rollers (4) have the same diameter as the rollers (2) fjord-20 organ (7), which is anordnat att vid valsens (2) fingering and unraveling of the furrow (4) folding (4) folding, folding (7) fitting, folding (2) the genome of the liner 25 is rolled (4). Il