FOLDING DOOR SYSTEM

Description

[0001] The present invention relates to a folding door system. In the folding door system according to the invention, in particular, an opening width is maximized.

[0002] Folding door systems are known from the prior art. These folding door systems usually comprise two folding doors, with each folding door having two door leaves. The folding door system has a complicated mechanism, as the door leaves must not only be moved but also folded. This results in a large number of moving parts, which results in play between the individual moving parts. For this reason, known folding door systems only have a maximum opening width of 2.00 m. Otherwise, the sum of the bearing play in the moving parts would cause the door leaves to sink so greatly when the folding door system moved that the folding doors would settle on the floor. This would mean that the distance to the floor would have to be increased, which would, however, result in poorer thermal insulation of the folding door.EP 1 160 409 B1 discloses an example of a folding door system.

[0003] It is therefore an object of the invention to provide a folding door system which has a maximum opening width while being simple and cost-effective to manufacture.

[0004] The problem is solved by the features of claim 1.

[0005] The subclaims contain preferred developments of the invention.

[0006] Each leaf of the folding door system preferably has a frame, wherein a vertical profile element of the frame has a first principal moment of inertia of between 30,000 mm 4< and 60,000 mm 4< , preferably 48,470 mm 4< , at the center of gravity. A second principal moment of inertia of the vertical profile element is between 60,000 mm 4< and 80,000 mm 4< , preferably 73,570 mm 4< , at the center of gravity. A polar moment of inertia of the vertical profile element is between 120,000 mm 4< and 130,000 mm 4< , preferably 122,041 mm 4< .

[0007] Alternatively or additionally, it is provided that each wing has a frame, wherein a vertical profile element of the frame has a first principal moment of inertia at the center of gravity of between 20,000 mm 4< and 40,000 mm 4< , preferably 31,934 mm 4< . A second principal moment of inertia of the vertical profile element is between 50,000 mm 4< and 80,000 mm 4< , preferably 65,389 mm 4< . Finally, a polar moment of inertia of the vertical profile element is between 85,000 mm 4< and 110,000 mm 4< , preferably 97,324 mm 4< .

[0008] Finally, it is provided that a horizontal profile element of the frame at the center of gravity has a first principal moment of inertia between 85,000 mm 4< and 120,000 mm 4< , preferably 102,266 mm 4< . A second principal moment of inertia of the horizontal profile element at the center of gravity is between 85,000 mm 4< and 120,000 mm 4< , preferably 103,497 mm 4< . Finally, a polar moment of inertia of the horizontal profile element at the center of gravity is between 150,000 mm 4< and 250,000 mm 4< , preferably 205,763 mm 4< .

[0009] Thanks to all the moments of inertia described above, the frame is designed to be stable, preventing the folding door from sinking due to an unstable frame. This also prevents the folding door from resting on the floor when opened at large widths.

[0010] It is preferably provided that the guide rail is made of a material with a modulus of elasticity at 20°C between 60 MPa and 80 MPa, preferably 70 MPa. Thus, in addition to the shape of the guide rail, which was previously described using the area moment of inertia, the material of the guide rail is also very stable, so that here too no subsidence due to an unstable material occurs. The modulus of elasticity is determined in accordance with EN ISO 689-1:2009. It is further advantageous that the guide rail is made of a material with a shear modulus at 20°C between 10 MPa and 40 MPa, preferably 27 MPa. The shear modulus is determined in accordance with DIN 53445. Based on the described modulus of elasticity and the shear modulus, a very robust guide rail is thus provided that allows only slight subsidence of the leaves of the folding door system during movement.

[0011] The frame of the wing preferably has four profile elements. The four profile elements are advantageously connected to one another in a force-locking manner. The contact pressure between two profile elements is 45,000–100,000 N. The contact pressure is adjustable, particularly during assembly of the profile elements to the frame. This contact pressure creates a rigid frame, which, together with the previously mentioned area moments of inertia of the profile elements, allows only a slight lowering of the folding doors, thus achieving a large opening width.

[0012] Advantageously, the filler element located within the frame has a thickness of 28-30 mm. This thickness makes the filler element very stable, allowing it to absorb forces. This further stiffens the frame and thus reduces the lowering of the folding door leaves during movement.

[0013] Furthermore, the filling element is designed to have a density of 2-3 g / cm3. Thus, the filling element has sufficient stability to stiffen the frame. This leads to a reduction in the lowering of the folding door leaves during movement.

[0014] The frame preferably has a width between 500 mm and 700 mm, particularly preferably 600 mm. In particular, together with the aforementioned parameters, the frame is very rigid. Thus, the frame allows a large opening width due to its large width. Two folding doors, each with two leaves, are particularly advantageous, so that an opening width of between 2000 mm and 2800 mm, preferably 2400 mm. The weight of a folding door is in particular between 80 kg and 100 kg, particularly preferably 90 kg. The rigid frames and the reinforcement of the frame by the filling element and the aforementioned minimized play between the hinges result in a very large opening width. This also ensures that the leaves do not touch the floor while the folding door system is being opened or closed.

[0015] Furthermore, to achieve a large opening width, it is important that no vibrations occur during the drive of the folding door system. Therefore, it is preferably provided that the leaves can be accelerated by the drive unit for opening the folding door in such a way that maximum acceleration of the leaves can be achieved after a travel of the folding door of a maximum of one-third, in particular of a maximum of one-quarter, of the total travel of the folding door. This rapid acceleration of the leaves of the folding doors prevents vibration, in particular the swinging up of the leaves. This also minimizes the lowering of the leaves during the travel.

[0016] It is particularly advantageous that the acceleration of the blades can be reduced to zero by the drive unit after the first quarter and before the last quarter, in particular after the first third and before the last third, of a travel path. The reduction occurs in particular linearly. This ensures a continuous acceleration of the blades, which in turn results in the prevention or at least reduction of blade vibrations.

[0017] Finally, it is preferably provided that the maximum closing speed of the folding door is no more than half the maximum opening speed of the folding door. If a folding door needs to be opened, this is usually because a user wants to pass through the door. Therefore, the folding door system must be opened quickly, as users usually do not want to wait long to pass through. Rapid opening can be achieved with the acceleration profiles described above without vibrations occurring during movement, which would result in the folding door leaves sinking, thus creating the risk of the folding door coming into contact with the floor supporting the folding door system. However, the advantageous embodiments of the invention effectively prevent such a sinking, ensuring rapid opening of the folding door system even with large opening widths.During the closing process, however, the rapid movement of the leaves is not required. Rather, the slower movement of the leaves facilitates obstacle detection, effectively preventing contact between a user and the closing door. This allows the folding door to open very quickly and close very securely, even with large opening widths.

[0018] The invention will now be described in more detail using an exemplary embodiment. In the following: Fig. 1 is a schematic illustration of the folding door system according to an embodiment of the invention, Fig. 2 is a schematic detailed view of a hinge connection between two leaves of a folding door of the folding door system according to the embodiment of the invention, Fig. 3 is a further schematic detailed view of a hinge connection between two leaves of a folding door of the folding door system according to the embodiment of the invention, Fig. 4 is a schematic sectional view of the connection of the hinges of the leaves of the folding door system according to the embodiment of the invention, Fig. 5 is a schematic view of the drive of the folding door system according to the embodiment of the invention, Fig. 6 is a schematic exploded view of the carriage of the folding doors of the folding door system according to the embodiment of the invention,7 a schematic view of the bearing of the carriages of the folding doors of the folding door system according to the embodiment of the invention, Fig. 8 a schematic view of the seal of the folding doors of the folding door system according to the embodiment of the invention, Fig. 9 a schematic representation of the sealing effect of the seal from . Fig. 8, Fig. 10 a schematic representation of the obstacle monitoring of the folding door system according to the embodiment of the invention in an open position of the folding doors, Fig. 11 a schematic representation of the obstacle monitoring of the folding door system according to the embodiment of the invention in a closed position of the folding doors, Fig. 12 a schematic representation of the obstacle monitoring of the folding door system according to the embodiment of the invention in a half-closed position of the folding doors, Fig. 13 a first schematic representation of the closing process of the folding door system according to the embodiment of the invention, Fig. 14 a second schematic representation of the closing process of the folding door system according to the embodiment of the invention, Fig. 15 a third schematic representation of the closing process of the folding door system according to the embodiment of the invention, Fig.16 a first schematic flow chart of the obstacle detection of the folding door system according to the embodiment of the invention, Fig. 17 a second schematic flow chart of the obstacle detection of the folding door system according to the embodiment of the invention, Fig. 18 a schematic representation of a flow chart of a locking control of the folding door system according to the embodiment of the invention, and Fig. 19 a schematic representation of the speed profile and the acceleration profile of the folding door system according to the embodiment of the invention.

[0019] Fig. 1 shows a schematic view of the folding door system 1 according to an embodiment of the invention. The folding door system 1 comprises a first folding door 2 and a second folding door 3. The first folding door 2 and the second folding door 3 each comprise a first leaf 24 and a second leaf 25, which are connected via a hinge system (cf. Fig. 2 to 4) are connected. The first wing 24 has a first frame 10, while the second wing 25 has a second frame 11. In particular, the individual wings 24, 25 are constructed identically, so that in particular the first frame 10 is also identical to the second frame 11. A filling element 22 is held by each of the first frame 10 and the second frame 11, wherein the filling element 22 is in particular a glass pane. If the folding door system 1 is to be opened or closed, at least one of the folding doors 2, 3, i.e. either the first folding door 2 or the second folding door 3 or the first folding door 2 and the second folding door 3 together, is moved along a guide rail 8. This folds the first wings 24 and the second wings 25 relative to one another. Therefore, the folding door system 1 has a folding side into which the first wing 24 and the second wing 25 move for folding.

[0020] The Fig. 2shows a section through the first folding door 2 in a top view. It can be seen that the first frame 10 and the second frame 11 each have two vertical profile elements 12 and two horizontal profile elements 13. In order to obtain a secure and reliable connection between the horizontal profile element 13 and the vertical profile element 12, as well as to achieve simple and cost-effective assembly of the first frame 10 and the second frame 11, the horizontal profile element 13 and the vertical profile element 12 are butted against one another and screwed together. For this purpose, a counter element 49 is introduced into the horizontal profile element 13. The counter element 49 lies directly against the vertical profile element 12 and is screwed to the vertical profile element 12 via two fastening screws 66. The fastening screws 66 are supported on a fastening element 48 which is arranged in the vertical profile element 12.In this way, a defined contact force can be set between the vertical profile element 12 and the horizontal profile element 13. This ensures a secure and, in particular, rigid connection. Furthermore, the support of the fastening screws 66 on the fastening element ensures that the fastening screws 66 do not protrude from the vertical profile element 12 and thus complicate the assembly of the first wing 24 or the second wing 25.

[0021] The vertical profile element 13 comprises two thermal separations 31 and two clamping elements 50, each arranged substantially perpendicular to one another. The clamping elements 50 serve to accommodate the filling element 22, while the thermal separations 31 thermally insulate the two clamping elements 50 from one another. Thus, in particular, a first outer surface 32 of the first frame 10 and the second frame 11 is thermally separated from a second outer surface 33 of the first frame 10 and the second frame 11, which is in particular opposite the first outer surface. Thus, the folding door system 1 also forms a thermal separation between those areas that are to be separated with the folding door system 1.

[0022] By designing the thermal breaks 31 as insulation webs, a chamber 51 is formed within the vertical profile element 12. The fastening element 48 is mounted within this chamber 51. In particular, the fastening element 48 is a perforated plate that is inserted into fastening grooves 47 (see Fig. 3 ) is inserted. This enables a very simple connection between the horizontal profile element 13 and the vertical profile element 12, while at the same time preventing the fastening screws 66 from projecting out of the vertical profile element 12 as described above.

[0023] As both Figure 2 as well as from Fig. 3As can be seen, a first hinge element 20 is inserted into the first frame 10, while a second hinge element 21 is inserted into the second frame 11. The first frame 10, in particular the vertical profile element 12, has a groove 43 in the vertical direction. The first hinge element 20 is inserted into this groove 43. Analogously, the second frame 11 also has a groove 43 into which the second hinge element 21 is inserted.

[0024] To fix the first hinge element 20 and the second hinge element 21 to the first frame 10 and the second frame 11, the first hinge element 20 and the second hinge element 21 have a fastening web 44. With the fastening web 44, the first hinge element 20 is inserted into the groove 43 of the first frame 10, and the second hinge element 21 is inserted into the groove 43 of the second frame 11. Both the fastening web 44 and the groove 43 have an undercut 55, so that the first hinge element 20 is arranged in the groove 43 with a positive fit in all directions except the vertical. The same applies to the second hinge element 21.

[0025] In order to achieve complete fixation of the first hinge element 20 and the second hinge element 21 to the first frame 10 and the second frame 11, both the first hinge element 20 and the second hinge element 21 have a strip web 45. The strip web 45 is attached, in particular, opposite the undercut 55 to the first hinge element 20 and to the second hinge element 21. A threaded bore 46 is provided in the strip web 45, into which a grub screw can be screwed. Thus, the strip web 45 can be pushed away from the first frame 10 by screwing the grub screw into the threaded bore 46, which simultaneously presses the groove 43 against the fastening web 44. Thus, the first hinge element 20 can be pressed against the first frame 10, in particular against the vertical profile element 12, via the undercut 55. The contact pressure creates a force connection which also acts in the vertical direction.Thus, by clamping the first frame 10 between the fastening web 44 and the grub screw screwed into the threaded hole 46 of the strip web 45, a complete fixation of the first hinge element 20 is possible. The same applies analogously to the second hinge element 21 and the second frame 11.

[0026] The first hinge element 20 and the second hinge element 21 have the advantage that they are only attached to an outer region of the first frame 10 and the second frame 11. This prevents, in particular, the attachment of the hinge elements 20, 21 from creating a cold bridge along the thermal breaks 31 in the vertical profile elements 13. This ensures safe and reliable thermal separation. At the same time, a secure and rigid connection of the first hinge element 20 to the first frame 10 and of the second hinge element 21 to the second frame 11 is possible. This results in a very stable folding door 2, 3, which is why any lowering in the horizontal direction of the leaves 24, 25 is very small, even with large opening widths.

[0027] In order to connect a first hinge element 20 to a second hinge element 21, the first hinge element 20 has a first sleeve-shaped region 52, while the second hinge element 21 has a second sleeve-shaped region 53. The connection of the first sleeve-shaped region 52 to the second sleeve-shaped region 53 is particularly Fig. 4shown. Thus, a door bolt 54 is mounted, in particular via a bearing each, on the inner surface 56 of the first sleeve-shaped region 52 and the second sleeve-shaped region 53. The inner surface 56 of the sleeve-shaped regions 52, 53 have the shape of a hollow splined shaft, whereby the bearing of the door bolt 54 is mounted rotationally fixed in the first sleeve-shaped region 52 and the second sleeve-shaped region 53. In this way, a low-friction yet stable bearing is achieved, whereby play in the connection between the first hinge element 20 and the second hinge element 21 is minimized. Due to the thus minimized hinge play, the lowering of the folding doors 2, 3 during the movement between an open and closed position is a maximum of 4 mm.A further advantage of this connection is that each first sleeve-shaped region 52 can be connected to two second sleeve-shaped regions 53, whereby each second sleeve-shaped region 53 can also be connected to two first sleeve-shaped regions 52. Thus, the folding door 2, 3 can be very flexibly assembled from the first leaf 24 and the second leaf 25. The number of first hinge elements 20 and second hinge elements 21 thus allows the rigidity of the mounting of the first leaf 24 and the second leaf 25 relative to one another to be adjusted.

[0028] The Fig. 5shows a drive of the folding door system 1. A drive unit 4 is provided, which is in particular a direct current electric motor. The drive unit 4 is connected to a gear 5 that drives a conversion device 6. The conversion device 6 is in particular a disc or comprises two lever arms, with a rod 7 attached to the outer regions of the disc or the lever arms. In particular, a separate rod 7 is provided for each folding door 2, 3. The conversion device 6 converts the rotation of the gear 5 into a translation of the rod 7.

[0029] If the folding door 2, 3 is to be opened, the drive unit 4 is controlled accordingly, whereby it applies a torque to the gear 5. Via the gear 5, the torque is applied to the conversion device 6, in which the torque is converted into a tensile force within the rod 7. Thus, by controlling the drive unit 4, a tensile force can be generated on the rod 7, with which each folding door 2, 3 can be displaced along the guide rail 8. A control unit 19 is provided to control the drive unit 4. The folding door system 1 also has a monitoring device 23, with which a movement of the folding doors 2, 3 can be monitored. This will be explained below with reference to the Fig. 10 to 15 described.

[0030] In order to guide the folding doors 2, 3 in the guide rail 8, each folding door 2, 3 has a carriage 9. An exploded view of the carriage 9 is shown in Fig. 6 shown.

[0031] The carriage 9 comprises a base body 26 having a plurality of bores. Four vertical rollers 15 can be inserted into four of these bores, wherein the vertical rollers 15 have an axle 65 that is frictionally fastened within the bores of the base body 26. A roller body 16 is mounted on the axle 65 via a bearing 30, in particular a closed ball bearing. The roller body 16 has a roller surface 17 that runs on a running surface 18 of the guide rail 8. The vertical rollers 15 have a diameter of 100 mm, in particular.

[0032] The base body 26 also has a through-hole 29 through which a bolt 27 is guided. A horizontal roller 14 is mounted on the bolt 27. The horizontal roller 14 is mounted directly on the bolt 27, i.e., without an additional bearing. Likewise, the horizontal roller 14 has a larger diameter than the vertical rollers 15. Finally, the horizontal roller 14 has a spherical running surface. The horizontal roller 14 serves to laterally guide the carriage 9 within the guide rail 8.

[0033] A suspension 28 for the folding door 2, 3 is attached to the bolt 27. In particular, the suspension 28 is screwed to a thread of the bolt 27. This also enables height adjustment and thus alignment of the folding door 2, 3 relative to the carriage 9. Therefore, the folding door system 1 is adaptable to a variety of environmental conditions.

[0034] If the folding door system 1 is in the closed position, i.e., the first folding door 2 and the second folding door 3 are in an extended state, the space between the first folding door 2 and the second folding door 3 must be sealed. For this purpose, a sealing element 34 is provided. The sealing element 34 is shown schematically in Fig. 8 The sealing effect of the sealing element 34 is shown in Fig. 9 shown.

[0035] The sealing element 34 comprises a plate-shaped base region 35 as well as a first tubular sealing region 36 and a second tubular sealing region 41. A wall thickness of the tubular sealing region 41 is between 0.5 mm and 1.5 mm, in particular 1.0 mm. A wall thickness of the base region 35 is between 0.5 mm and 2.0 mm, in particular between 1.0 mm and 1.5 mm. Both the first sealing region 36 and the second sealing region 41 are arranged on the same side of the base region 35 and are in particular aligned symmetrically to one another. On the side of the base region 35 of the sealing element 34 opposite the first sealing region 36 and the second sealing region 41, two undercut elements 42 are arranged, with which the sealing element 34 can be attached to the vertical profile elements 13 of the first frame 10 and the second frame 11.It is also provided that both the first frame 10 and the second frame 11 are covered by the base region 35 of the sealing element 34. Thus, the sealing element 34 fulfills a first sealing effect by sealing the vertical profile elements 13.

[0036] A second sealing effect is achieved by the first sealing region 36 and the second sealing region 41 of a sealing element 34 resting against the base region 35 of another sealing element 34. Thus, it is provided in particular that the first sealing region 36 and the second sealing region 41 of a sealing element 34, which is arranged at a movable end 38 of the first folding door 2, rest against the base region 35 of the sealing element 34, which is attached to the movable end 38 of the second folding door 3, when the folding door system 1 is closed. It is provided that the first sealing region 36 and the second sealing region 41 are deformed by resting against the base region 35 of another sealing element 34, so that a contact force is exerted by the sealing element 34 itself. This ensures a high level of tightness.

[0037] In order to take the kinematics of the folding door system 1 into account, the first sealing region 36 and the second sealing region 41 each have a first leg 39 and a second leg 41. The first leg 39 is attached to the base region 35, while the second leg 40 is attached to the first leg 39. The first leg 39 is angled relative to the base region 35. The angle is designed such that the first leg 39 of the first sealing region 36 points in the direction of the second sealing region 41. Likewise, the first leg 39 of the second sealing region 41 points in the direction of the first sealing region 36. In contrast, the second leg 40 of the first sealing region 36 points away from the second sealing region 41, and the second leg 40 of the second sealing region 41 also points away from the first sealing region 36. In this way, there is a kink between the first leg 39 and the second leg 40.This bend can be used to generate a spring effect of the first sealing region 36 and the second sealing region 41, in which the first sealing region 36 and the second sealing region 41 are deformed by contact with the base region 35 of another sealing element 34. The elastic restoring force of the first sealing region 36 and the second sealing region 42 thus enables two sealing elements 34 to fit tightly against one another. This is shown in . Fig. 9 shown.

[0038] Preferably, a first angle between the first leg 39 and the second leg 40 is between 120° and 150°, particularly preferably 135°. A second angle between the first leg 39 and the base region 35 is between 55° and 80°, particularly 68°.

[0039] The folding door system 1 is located in the Fig. 9shown state in a closed position, so that the sealing elements 34 attached to the movable ends 38 of the first folding door 2 and the second folding door 3 abut each other. Fig. 9 no deformation of the sealing elements 34 is shown, but it is schematically shown how far the first sealing areas 36 and the second sealing areas 41 would penetrate into the respective opposite base areas 35 if these were not deformed. Thus, Fig. 9It can be seen that in order to close the folding doors 2, 3, a considerable deformation of the sealing elements 34 is necessary, so that the first sealing areas 36 and the second sealing areas 41 generate a high restoring force. This ensures that the sealing elements 34 are pressed firmly against one another. In this way, on the one hand, a high sealing effect is ensured, while on the other hand, the sealing element 34 adapts to the kinematics of the folding door system 1. For example, with the folding door systems, it is necessary that during a closing process the movable ends 37 of the folding doors 2, 3 are first moved towards one another, with the movable ends 38 of the folding doors 2, 3 being moved apart from one another by a small amount in a final movement step. If this is carried out with conventional seals, the conventional seal must be strongly compressed, which results in an increased driving force of the drive unit 4.In contrast, the first sealing regions 36 and the second sealing regions 41 are easily deformable, resulting in low driving forces within the drive unit 4. This protects the drive unit 4, while at the same time eliminating the risk of an erroneous error message being generated due to excessive driving forces.

[0040] In the Fig. 10 to 12 A folding door system 1 is shown schematically, with the folding doors 2 in different positions. Fig. 10 the folding door system 1 is fully opened, in Fig. 11 completely closed and in Fig. 12 partially open.

[0041] The folding door system 1 has an obstacle sensor 57 that generates a sensor field 59. Thus, the obstacle sensor 57 can detect whether an obstacle, in particular a person, is located within the sensor field 59. The obstacle sensor 57 is, in particular, an optical sensor. On a floor on which the folding door system 1 is mounted, a projection 58 of the sensor field 59 results in an ellipse.

[0042] When the folding door system 1 is moved, a passage from a first area 60 to a second area 61 can be opened or closed. To open the passage, movable ends 38 of the first folding door 2 and the second folding door 3 are moved along the guide rail 8 toward the fixed ends 37 of the first folding door 2 and the second folding door 3. The first folding door 2 and the second folding door 3 are attached to a wall and / or floor at the fixed ends 37, allowing rotation. Thus, when the folding door system 1 is opened, the folding doors 2, 3 fold in toward the first area 60. This means that the first leaves 24 and the second leaves 25 of the folding doors 2, 3 are always located within the first area 60, but never within the second area 61.

[0043] One problem with this movement is Fig. 12shown. Here it can be seen that the folding doors 2, 3 are directly adjacent to the sensor field 59, in particular to the projection 58 of the sensor field 59 of the obstacle sensor 57. Thus, the projection 58 has a first entry area 63, into which the first folding door 2 enters during an opening or closing process, while the second folding door 3 enters a second entry area 64 of the projection 58. However, this would always lead to the erroneous assumption that an obstacle is located within the closing path of the folding doors 2, 3. To prevent this, the monitoring device 23 is configured, which is Fig. 16 or 17 The flow charts shown in Fig. 16 and 17 The flow charts shown are explained below with reference to the Fig. 13 to 15 explained.

[0044] The Fig. 13 to 15show a plan view of a schematic folding door system 1 according to the embodiment of the invention. In Fig. 13 the folding door system 1 is partially closed, whereby the first folding door 2 and the second folding door 3 remain outside the sensor field 59, in particular outside the projection 58 of the sensor field 59. Fig. 5 It can be seen that the first folding door 2 and the second folding door 3 remain in a fully closed position outside the projection 58.

[0045] Fig. 14shows a state in which the first folding door 2 is directly adjacent to the first entry area 63 and the second folding door 3 is directly adjacent to the second entry area 64. If the first folding door 2 and the second folding door 3 execute a closing movement, they have just left the sensor field 59. In this state, the first folding door 2 and the second folding door 3 are located within an activation area 62. The activation area 62 corresponds to a predefined width of the guide rail 8 along the direction of travel of the folding doors 2, 3, wherein this width is arranged symmetrically around a center point between the first folding door 2 and the second folding door 3. The position of the first folding door 2 and the second folding door 3 is thus defined in particular by the position of the movable ends 38 on the guide rail 8.If the movable ends 38 and thus the first folding door 2 and the second folding door 3 are located within the activation area 62, the first folding door 2 is located outside the first entry area 63 and the second folding door 3 is located outside the second entry area 64.

[0046] If the schedule is Fig. 16executed by the monitoring unit 23, the obstacle sensor 57 is active at all times. The sequence begins with an initial step S00. Subsequently, in a first step, it is determined whether the first folding door 2 and the second folding door 3 are executing a closing movement. This can be determined in particular using a position sensor (not shown). The position sensor is in particular an incremental encoder arranged on the rotation axis of the drive unit 4. Thus, on the one hand, the position of the first folding door 2 and the second folding door 3 can be determined, and on the other hand, it can also be determined whether the first folding door 2 and the second folding door 3 are currently executing a closing movement. If the presence of a closing movement is affirmed, the second step S02 is executed.Here, a query is made as to whether the obstacle sensor 57 has detected an object within the sensor field 59, in particular the projection 58. If this is the case, the process continues with the third step S03. However, if this is not the case, the process proceeds to a final termination step S05.

[0047] In the third step S03, it is queried whether the first folding door 2 and the second folding door 3 are located within the activation area 62. If this is the case, the closing movement of the first folding door 2 and the second folding door 3 is stopped or reversed in a fourth step S04. Since the first folding door 2 and the second folding door 3 are located within the activation area 62, detection of the first leaf 24 or the second leaf 25 of the first folding door 2 or the second folding door 3 within the projection 58 and thus false detection of a non-existent obstacle is ruled out. A detected obstacle must therefore be an external obstacle, for example a pedestrian crossing the folding door system 1. Stopping and / or reversing is therefore necessary. The final termination step S05 is then executed.

[0048] In this very simple sequence, the obstacle sensor 57 is permanently activated, whereby signals from the obstacle sensor are not used at all times. Thus, the signals from the obstacle sensor are only considered when the first folding door 2 and the second folding door 3 are within the activation area 62. Therefore, in Fig. 17 a more energy-saving variant of the process is shown.

[0049] The process again begins with an initial step S10. In a first step S11, it is determined whether the first folding door 2 and the second folding door 3 are executing a closing movement. If this is the case, a second step S12 determines whether the first folding door 2 and the second folding door 3 are within the activation area 62. If this is not the case, the obstacle sensor 57 is deactivated in a third step S13 and the process continues with the first step S11. The folding door system 1 is therefore in a position in which the signal from the obstacle sensor 57 is not reliable, since in this position an incorrect detection of the first folding door 2 or the second folding door 3 as an obstacle is possible. Since the obstacle sensor 57 does not provide reliable data, deactivating the obstacle sensor 57 is advisable in order to save energy.

[0050] If, however, it is determined in the second step S12 that the first folding door 2 and the second folding door 3 are located within the activation area 62, the obstacle sensor 57 is activated in a fourth step S14. Subsequently, in a fifth step S15, it is checked whether the obstacle sensor 57 has detected an obstacle. If this is not the case, the process continues with the second step S12 in a sixth step S16. If, however, an obstacle is detected, the closing movement of the first folding door 2 and the second folding door 3 is stopped and / or reversed in a seventh step S17. Again, in this case, it can be assumed that the detected obstacle is an external obstacle, for example, a person walking through the folding door system 1, which is why stopping and / or reversing is necessary. The process is then terminated with a final termination step S18.

[0051] The Fig. 17 The procedure shown enables the same results as in Fig. 16 , whereby energy can be saved by temporarily switching off the obstacle sensor 57. Thus, the folding door system 1 is very cost-effective, yet still reliable and safe to operate.

[0052] Obstacle monitoring makes it possible to realize a closing movement of the folding door system 1 not exclusively by monitoring the power consumption of the drive unit 4. In this case, an obstacle would have to come into contact with the closing folding door system 1 for the obstacle to be detected. However, people in particular find contact with the closing folding door system 1 very unpleasant, which is why this should be avoided if possible. However, since the sensor field 59, and in particular the projection 58, must be arranged outside a passage plane of the folding door system 1, the problem must always be expected that the obstacle sensor 57 incorrectly detects the first leaf 24 or the second leaf 25 of the folding doors 2, 3 as an obstacle.Therefore, without the previously described procedures, obstacle monitoring using obstacle sensor 57 would only be possible with very precise adjustment of the projection 58 of sensor field 59. The sensor field 59 would have to be aligned in such a way that retraction of the folding doors 2, 3 is safely and reliably prevented. This complex adjustment of the obstacle sensor is avoided by the previously described procedures.

[0053] The Fig. 18 shows a flow chart of a wind load control, which is carried out in particular by the control unit 19 of the folding door system 1. Such a wind load control is intended to ensure that the folding doors 2, 3 remain in the closed position even in the presence of strong gusts of wind and are not forced open by the wind. In particular, it is provided that the Figure 18 The flow chart shown is executed in the control unit every ten milliseconds.

[0054] For wind load control, it is assumed that the folding door system 1 is in the closed position. If the position sensor detects that the folding doors 2, 3 are not in the closed position, this must have been caused by a gust of wind. Alternatively, this can also be caused by a force applied manually to the folding door system 1. In both cases, however, it is undesirable for the folding doors 2, 3 to open. Thus, the wind load control is implemented in such a way that it attempts to minimize any deviation of the door position of the folding doors 2, 3 from the target position, i.e., from the closed position.

[0055] As previously described, the position sensor is used to determine the door position. The position sensor is, in particular, an incremental encoder arranged on a motor shaft of the drive unit 4. To ensure sufficiently accurate position determination, the incremental encoder has a resolution of between 3,000 and 35,000, preferably between 5,000 and 30,000, and particularly preferably between 7,500 and 2,000, pulses per travel path between the open and closed positions of the folding door system 1. Such a resolution ensures that the positions of the first folding door 2 and the second folding door 3 can be reliably detected.

[0056] The wind load control as it is Figure 18shown, essentially comprises three control complexes, which are initialized by a first step S21, a fourth step S24 and a sixth step S26. These control complexes have different tasks, which are described in detail below: After an initialization step S20, the first step S21 queries whether the folding door system 1 has opened by more than a predefined limit value within a predefined period of time. The predefined period of time is in particular the throughput time, thus preferably ten milliseconds. The predefined limit value is advantageously 20, particularly advantageously 43, pulses of the incremental encoder. If such an opening is detected, the process continues with the second step S22. In the second step S22, a power that is delivered to the drive unit 4 and which effects a closing force on the folding doors 2, 3 is increased.In particular, the power is electrical power, with the electrical voltage preferably being constant. Thus, the power is controlled via the current intensity. Therefore, it is particularly preferred that the current delivered to the drive unit 4 be increased in the second step S22. The increase is advantageously 500 mA.

[0057] With the increased current, the drive unit 4 generates an increased closing force, which acts on the first folding door 2 and on the second folding door 3. This closing force, on the one hand, creates a holding force when the folding door system 1 is in the fully closed position; on the other hand, the closing force causes the leaves 24, 25 of the folding door system 1 opened by gusts of wind to close. In a subsequent third step S23, a time counter is finally started, which is, in particular, 15 minutes.

[0058] The first control complex, initiated by the first step S21, ensures that the folding door system 1 does not open repeatedly in the event of repeated gusts. Thus, the first step S21 determines whether a strong gust of wind is present, since only a strong gust of wind allows the large opening within a short period of time. If a strong gust of wind is detected, it can be assumed that this strong gust of wind will be followed by further gusts of wind, which will usually have the same maximum strength as the initially detected gust of wind. Thus, by increasing the current supplied to the drive unit 4, the folding door system 1 can remain in a closed position, even if subsequent gusts of wind act on the folding doors 2, 3. Starting the counter in the third step S23 enables a gradual reduction of the current increased in the second step S22.This reduction is the subject of the second rule complex, which is initiated with the fourth step S24.

[0059] If the query in the first step S21 is answered in the negative or the third step S23 has been successfully executed, the fourth step S24 queries whether the time counter has been started. If this is the case, the fifth step S25 is executed at regular intervals. The regular intervals are in particular every three minutes. Finally, in the fifth step S25, the current increased in the second step S22 is reduced, in particular by 100 mA in each case. The process then continues with the sixth step S26. This is preferably repeated five times so that after 15 minutes of the time counter running, the increased current is reduced five times by 100 mA. After the 15 minutes have elapsed, the current increased in the second step S22 is thus completely reduced again. In this way, overloading of the drive unit 4 is avoided, in particular.

[0060] The third control complex is initiated with the sixth step S26. In the sixth step S26, it is determined whether the folding doors 2, 3 exhibit a deviation from the fully closed position. As previously described, such a deviation is caused in particular by a wind load or by a manual force on the leaves 24, 25 of the folding door system 1. Since the folding door system 1 is intended to remain in the fully closed position, such a deviation is undesirable.

[0061] If a deviation is detected, the process continues with the seventh step S27. In the seventh step S27, the current supplied to the drive unit 4 is increased. The increase is linear to the deflection of the folding doors 2, 3 from the fully closed position. A p-controller is thus implemented. The current to be supplied to the drive unit 4 is therefore calculated according to the following scheme: new current = previous current + deviation of the folding doors 2, 3 from the closed position x control factor. In this way, the system reacts immediately to the effect of wind force on the folding door system 1, ensuring that the folding door system 1 is only forced open by the wind load in very few cases, since such a pushing open is effectively prevented by the control according to the seventh step S27.

[0062] Due to the control in the seventh step S27, it may happen that the power delivered to the drive unit 4 exceeds the rated power of the drive unit 4. In particular, the delivered current then exceeds a specified maximum rated current. This is checked in an eighth step S28. If the maximum rated current is exceeded, the process continues with the ninth step S29. If, however, the maximum rated current is not exceeded, the process ends with the termination step S30.

[0063] In the ninth step S29, the current applied to the drive unit in the seventh step S27 is reduced to the maximum rated current. This occurs in particular within a predetermined period of time, which is advantageously ten seconds. The brief overload of the drive unit ensures that the folding door system 1 remains in the closed position even in strong gusts of wind. However, unlike in the prior art, a drive unit 4 with a high maximum rated power need not be used; rather, due to the monitoring of the power delivered to the drive unit 4 in the eighth step S28, a drive unit 4 with a low maximum rated power can also be used. Since the spatial dimension of the drive unit 4 usually increases with increasing rated power, it is thus possible to use a small and compact drive unit 4.Thus, a filigree folding door system 1 can be realized which nevertheless has a sufficiently high-performance wind load control so that the folding door system 1 remains in the closed position even when strong gusts of wind occur.

[0064] The Fig. 19finally shows travel curves of the folding door system 1 during opening and closing of the folding doors 2, 3. The upper diagram shows a speed profile, while the lower diagram represents an acceleration profile. In both diagrams, a position of the folding doors 2, 3 is shown on the abscissa axis, i.e. a position of the movable end 38 on the guide rail 8. This means that at a left-hand limit value the folding door system 1 is completely closed, while at a right-hand limit value on the abscissa axis the folding door system 1 is completely open. The coordinate axes of the diagrams show a speed in the upper diagram and an acceleration of the folding doors 2, 3 in the lower diagram. If the folding door system 1 is opened, the folding doors 2, 3 behave according to the upper curve of the diagrams.If, on the other hand, the folding door system 1 is closed, the folding doors 2, 3 behave according to the lower curves in the diagrams. The speed and acceleration profiles shown allow the folding door to open quickly, while at the same time vibrations within the folding door system 1 are avoided both during opening and closing. Due to the reduction in vibrations, the lowering of the leaves 24, 25 of the folding door system 1 is minimized, which is why they can have a small distance to the floor. This increases thermal insulation. At the same time, the reduction in vibrations and the resulting minimal lowering of the folding doors 2, 3 allow a large opening width to be achieved. In particular, a maximum opening width of 2,400 millimeters is possible in this way. This means that when four leaves 24, 25 are used, as shown in . Figure 1was shown, each wing has a width of 60 millimeters.

[0065] Out of Figure 19 It can be seen that the leaves 24, 25 of the folding door system 1 can be accelerated by the drive unit to open the folding doors 2, 3. In this case, maximum acceleration is reached after a travel distance of a maximum of one third, preferably a maximum of one quarter, of the total travel distance of the folding doors 2, 3. In this way, rapid opening of the folding door system 1 is achieved. After the maximum acceleration is reached, the acceleration is reduced by the control unit 19, wherein the reduction occurs in particular linearly. It is provided that the acceleration is reduced to zero before reaching the last quarter, in particular before reaching the last third, of the maximum travel distance of the folding doors 2, 3.

[0066] Within the last quarter or within the last third of the travel path of the folding doors 2, 3, the leaves 24, 25 are finally decelerated. For this purpose, a negative acceleration is applied to the folding doors 2, 3, whereby the maximum negative acceleration is in particular 50 percent higher than the maximum positive acceleration of the folding doors 2, 3. The resulting rapid deceleration of the leaves 24, 25 allows a gentle reaching of the end stop in the open position.

[0067] It is evident that in this way a very rapid opening of the folding door system 1 is possible, so that a user who wants to pass through the folding door system 1 does not have to wait for the opening process of the folding doors 2, 3.

[0068] When the folding door system 1 is closed, the maximum closing speed of the folding doors 2, 3 is at most half the maximum opening speed of the folding doors 2, 3. This enables monitoring of the closing process, in particular, since the reduced speed when closing the folding door system 1 allows monitoring of the closing movement. Therefore, if the folding door system 1 detects an obstacle within the travel path of the folding doors 2, 3, the folding door system 1 can stop and / or reverse the leaves 24, 25, which enables very safe operation of the folding door system 1.

[0069] In addition to the described movement of the folding doors 2, 3 when opening and closing the folding door system 1, the first frame 10 and the second frame 11 are also relevant for determining a maximum opening width of the folding door system 1. Therefore, a vertical profile element 12 of the first frame 10 or the second frame 11 has a first principal moment of inertia between 30,000 mm 4< and 60,000 mm 4< , preferably 48,470 mm 4< at the center of gravity. A second principal moment of inertia is between 60,000 mm 4< and 80,000 mm 4< , preferably 73,570 mm 4< . Finally, a polar moment of inertia is between 120,000 mm 4< and 130,000 mm 4< , preferably 122,041 mm 4< .

[0070] Alternatively, the vertical profile element 12 of the first frame 10 or the second frame 11 has a first principal moment of inertia at the center of gravity of between 20,000 mm 4< and 40,000 mm 4< , preferably 31,934 mm 4< . A second principal moment of inertia is between 50,000 mm 4< and 80,000 mm 4< , preferably 65,389 mm 4< . Finally, a polar moment of inertia is between 85,000 mm 4< and 110,000 mm 4< , preferably 97,324 mm 4< .

[0071] A horizontal profile element 13 of the first frame 10 or the second frame 11 has a first principal moment of inertia at the center of gravity of between 85,000 mm 4< and 120,000 mm 4< , preferably 102,266 mm 4< . A second principal moment of inertia is between 85,000 mm 4< and 120,000 mm 4< , preferably 103,497 mm 4< . Finally, a polar moment of inertia is between 150,000 mm 4< and 250,000 mm 4< , preferably 205,763 mm 4< .

[0072] Such area moments of inertia minimize the risk of the frame sinking even when the filling element is inserted. To further minimize the sinking, the guide rail is made of a material with a modulus of elasticity at 20°C between 60 MPa and 80 MPa, preferably 70 MPa. The modulus of elasticity is determined according to EN ISO 6892-1:2009. The shear modulus of the material of the guide rail 8, which can be determined in particular according to DIN 53445, is between 10 MPa and 40 MPa, preferably 27 MPa, at 20°C. This creates a very rigid frame 10, 11 around the filling element 22, so that the sinking of the first leaf 24 or the second leaf 25 and thus of the first folding door 2 or the second folding door 3 is minimized.

[0073] In this way, a maximum opening width of 2,400 millimeters is achievable, with the folding doors 2, 3 being lowered by a maximum of four millimeters over the entire travel range between the closed and open positions. This allows for a sufficiently high gap seal between the lower edge of the folding doors 2, 3 and the floor supporting the folding door system 1.

[0074] Furthermore, the folding door system 1 operates very quietly. This is achieved by minimizing the transmission and emission of structure-borne noise in the individual components of the folding door system 2. In particular, the roller body 16 of the rollers 14, 15 has a modulus of elasticity at 20°C between 2,700 MPa and 3,100 MPa, preferably 2,900 MPa. Furthermore, the roller body 16 has a density at 20°C between 1.10 g / cm 3 and 1.70 g / cm 3 , preferably 1.42 g / cm 3 . The modulus of elasticity is determined according to ISO 527. The density is determined according to ISO 1183.

[0075] The running surface 18 of the guide rail 8 has a modulus of elasticity at 20°C between 60 MPa and 80 MPa, preferably 70 MPa. Furthermore, the running surface 18 has a shear modulus at 20°C between 10 MPa and 40 MPa, preferably 27 MPa. Finally, the density of the running surface 18 at 20°C is between 3 g / cm 3 and 5 g / cm 3 , preferably 2 g / cm 3 . The modulus of elasticity is determined according to EN ISO 6892-1:2009. The shear modulus is determined according to DIN 53445, and the density according to ISO 1183.

[0076] Since both the modulus of elasticity and the shear modulus and the density are relevant for the transmission of structure-borne sound, the selection of these parameter ranges ensures minimal propagation of structure-borne sound within the folding door system 1. Thus, low noise emissions are present during operation of the folding door system 1.

[0077] The base body 26 of the carriage 9 has a modulus of elasticity at 20°C between 2,500 MPa and 2,900 MPa, preferably 2,700 MPa. The shear modulus of the base body 26 at 20°C is between 600 MPa and 900 MPa, preferably 750 MPa. Finally, the density of the base body 26 at 20°C is between 1.10 g / cm 3 and 1.70 g / cm 3 , preferably 1.39 g / cm 3 . The modulus of elasticity is again determined according to ISO 527, and the shear modulus according to DIN ISO 1827:2010-07. The density is again determined according to ISO 1183. This also results in poor structure-borne sound propagation within the base body 26 and thus within the entire carriage 9, which also minimizes noise emissions.

[0078] The roller surfaces 17 of the rollers 14, 15 have a surface roughness Rz between 5.0 µm and 7.0 µm, preferably 3.0 µm. In particular, the entire roller body 16 has such a surface roughness. Thus, there is little energy loss when the roller surfaces 17 roll on the running surface 18, which ensures quiet running. Likewise, the energy loss and wear, and thus also the noise emission, are reduced by the surface hardness of the roller body 16, in particular of the roller surface 17 of the rollers 14, 15, measured according to the Rockwell scale R, being between 100 and 140, preferably 120. In particular, the surface hardness is thus 92 according to the Rockwell scale M.

[0079] The running surface 18 preferably has a groove, wherein the groove is oriented parallel to a displacement direction of the carriage 19. Grooving is understood to mean a regular, wave-like pattern on the surface of the running surface 18. The groove has a surface roughness Ra, measured in the longitudinal direction, of 0.05 to 1.0, preferably 0.5. Thus, low noise emissions from the running surface 18 are also achieved due to low energy loss.

[0080] In order to ensure that the rollers 14, 15 roll reliably on the running surface 18 and to prevent the carriage 9 from jumping on the guide rail 8, a static surface pressure between a roller surface 17 of the rollers 14, 15 and the running surface 18 is between 8 N / mm 2< and 12 N / mm 2< , preferably 10 N / mm 2< .

[0081] The travel speed of the carriage 9 relative to the guide rail 8 is between 10 cm / s and 100 cm / s, preferably between 10 cm / s and 75 cm / s, particularly preferably between 10 cm / s and 50 cm / s. Since friction is fundamentally dependent on speed, these values can minimize friction and thus energy loss and thus also noise emissions. This, in turn, ensures very quiet operation of the folding door system 1.

[0082] Finally, the base body 26 of the carriage 9 is very solid and compact, thus avoiding noise. Thus, the length of the base body 26 is between 40 mm and 80 mm, preferably 60 mm. The width of the base body 26 is between 15 mm and 20 mm, preferably 18 mm. The height of the base body 26 is between 10 mm and 15 mm, preferably 13 mm. The vertical rollers 15 attached to the base body 26 have a radius between 75 mm and 125 mm, preferably 100 mm.

[0083] The connection between the vertical roller 15 and the base body 26 is made via an axle 65. The axle 65 has a modulus of elasticity at 20°C between 150 MPa and 250 MPa, preferably 200 MPa. The shear modulus of the axle 65 at 20°C is between 70 MPa and 90 MPa, preferably 81 MPa. Finally, the density of the axle 65 at 20°C is between 5.0 g / cm 3 and 10.0 g / cm 3 , preferably 7.9 g / cm 3 . The modulus of elasticity is determined according to EN ISO 689-1:2009, the shear modulus according to DIN 53445, and the density according to ISO 1183.

[0084] This minimizes the propagation of structure-borne noise throughout the entire assembly of the carriage 9, i.e., the roller body 16, the axle 65, and the base body 26. This ensures extremely quiet operation.

[0085] Finally, flattening of the rollers 14, 15 due to long periods of inactivity is prevented, which could lead to the generation of disturbing noises. Thus, after eight hours of resting on a flat surface and subjected to a test load of 200 N, the flattening of the rollers 14, 15, particularly the vertical rollers 15, is a maximum of 0.20 mm, preferably a maximum of 0.12 mm. This minimal flattening ensures that the rollers 14, 15 do not run unevenly if the folding door 1 is left inactive for long periods.

[0086] The water absorption of the roller body 16 after immersion in water at 23 degrees Celsius is between 0.1 and 0.5, preferably 0.3. The water absorption of the roller body 16 after storage at 50 percent relative humidity is between 1.2 and 1.6, preferably 1.4. The water absorption is determined according to ISO 62. In particular, Method 1 (immersion in water at 23 degrees Celsius) and Method 4 (storage at 50 percent relative humidity) are used. These values ensure that an increase in volume of the rollers 14, 15 upon water absorption does not lead to irregular running and thus to noise.

[0087] The folding doors 2, 3 have a maximum thermal transmittance UD of 3.0 W / (m 2 < K). In particular, the maximum thermal transmittance UD is 1.7 W / (m 2 < K). Thus, there is little heat transfer through the folding door system 1, making it suitable for separating a warm area from a cold area.

[0088] The frame 10, 11 of the folding doors 2, 3 is made, in particular, of a material having a thermal transmittance UD between 2.0 W / (m 2 < K) and 4.0 W / (m 2 < K). The filling element 22 of the folding doors 2, 3 comprises a material having a thermal transmittance UD between 0.5 W / (m 2 < K) and 1.5 W / (m 2 < K), preferably 1.0 W / (m 2 < K). These values enable the aforementioned low heat transfer through the folding door system 1.

[0089] As previously described, both the first frame 10 and the second frame 11 have thermal separations 31 in the vertical profile elements 12. The thermal separations 31 are, in particular, insulating webs, wherein the thermal separations 31 are made of a material with a thermal conductivity coefficient between 0.1 W / (m 2 < K) and 0.3 W / (m 2 < K), preferably 0.2 W / (m 2 < K). The elastic modulus of the thermal separation 31 at 20°C is between 400 MPa and 3,000 MPa, wherein the elastic modulus is measured in particular according to DIN 53457. Finally, it is provided that the thermal separation 31 comprises a material with a coefficient of linear expansion between 0.10 mm / (m K) and 0.25 mm / (m K), preferably between 0.15 mm / (m K) and 0.20 mm / (m K). Thus, sufficient thermal insulation is ensured by the thermal separation 31, thereby minimizing heat transfer through the first frame 10 and the second frame 11.

[0090] Furthermore, the filling element 22 comprises a material with a thermal conductivity coefficient between 0.60 W / (m 2 < K) and 0.90 W / (m 2 < K), preferably 0.76 W / (m 2 < K). The elastic modulus of the filling element 22 at 20°C is between 50 GPa and 90 GPa, preferably 70 GPa. Finally, it is provided that the filling element 22 comprises a material with a linear expansion coefficient of 0.01 mm / (m K). Thus, the heat transfer through the filling element 22 is also minimized.

[0091] The filling element 22 is connected to the first frame 10 and the second frame 11 via an adhesive. The adhesive has a tensile strength between 1.0 N / mm 2 and 2.5 N / mm 2 , preferably 1.8 N / mm 2 . The tensile strength can be determined in particular according to ISO 527.

[0092] In order to seal a gap between the folding doors 2, 3 and a floor or the guide rail 8, the folding door system 1 has seals in the form of brushes. These brushes seal the gap between the folding door 2, 3 and the floor or guide rail 8. The seals in the form of brushes have a bristle length between 12 mm and 20 mm, preferably 15.9 mm. A base body of the brushes comprises a round base body, which in particular has a diameter between 2.0 mm and 4.0 mm, preferably 2.9 mm. In this way, a secure and sufficient sealing of a gap between the folding door 2, 3 and the floor or guide rail 8 is possible. Heat transport through this gap is therefore virtually prevented.

[0093] Finally, a thermal bridge allowance between the filling element 22 and the first frame 10 or the second frame 11 is between 0.050 W / (m 2 < K) and 0.060 W / (m 2 < K), preferably 0.056 W / (m 2 < K). Likewise, a thermal bridge allowance between the first frame 10 and the second frame 11 and a wall supporting the frames is between 0.050 W / (m 2 < K) and 0.060 W / (m 2 < K), preferably 0.056 W / (m 2 < K). These low thermal bridge allowances effectively prevent thermal bridges from being created by the installation of the folding door system 1. Thus, the heat transport through the folding door system 1 is also reduced here. List of reference symbols

[0094] 1. Folding door system 2. First folding door 3. Second folding door 4. Drive unit 5. Gear 6. Conversion device 7. Rod 8. Guide rail 9. Carriage 10. First frame 11. Second frame 12. Vertical profile element 13. Horizontal profile element 14. Horizontal roller 15. Vertical roller 16. Roller body of the rollers 17. Roller surface of the rollers 18. Running surface of the guide rail 19. Control unit 20. First hinge body 21. Second hinge body 22. Filling element 23. Monitoring unit 24. First leaf 25. Second leaf 26. Carriage base body 27. Bolt 28. Suspension 29. Through opening 30. Bearing 31. Thermal break 32. First outer surface 33. Second outer surface 34. Sealing element 35. Base area of the sealing element 36. First sealing area of the sealing element 37. Fixed end of the folding door 38. Movable end of the folding door 39. First leg of the sealing area 40. Second leg of the sealing area 41. Second sealing area of the sealing element 42. Undercut element 43.Groove 44.Fastening web 45.Strip web 46.Threaded hole 47.Fastening groove 48.Fastening element 49.Counter element 50.Clamping element 51.Chamber 52.First sleeve-shaped area 53.Second sleeve-shaped area 54.Door bolt 55.Undercut 56.Inner surface of the sleeve-shaped area 57.Obstacle sensor 58.Projection of the sensor field 59.Sensor field 60.First area 61.Second area 62.Activation area 63.First entry area 64.Second entry area 65.Axis 66.Fastening screws.

Claims

1. A folding leaf door system (1), comprising - at least one folding leaf door (2, 3) with at least two leaves (24, 25), and - at least one drive unit (4) for moving the folding leaf door (2, 3) between a closed position and an open position, - a monitoring device (23) with which a movement of the folding leaf doors (2, 3) can be monitored, - a position sensor which can be used to determine the position in which the first folding leaf door (2) and the second folding leaf door (3) are located and which can be used to establish whether the first folding leaf door (2) and the second folding leaf door (3) are currently carrying out a closing movement, characterised in that the folding leaf door further comprises: - at least two hinge elements (20, 21) on each leaf (24, 25), via which two leaves (24, 25) of the folding leaf door (2, 3) are connected with play, wherein a maximum lowering of at least one region of the folding leaf door (2, 3) during movement of the folding leaf door (2, 3) between the open position and the closed position is at most 4 millimetres, - an obstacle sensor (57) that generates a sensor field (59), - wherein the activation range (62) corresponds to a predefined width of a guide rail (8) along the direction of travel of the folding leaf doors (2, 3), wherein this width is arranged symmetrically about a centre point between the first folding leaf door (2) and the second folding leaf door (3), ∘ wherein the obstacle sensor (57) is active at all times and the monitoring unit (23) is configured to carry out the following process: ▪ the process begins with an initial step (S00); ▪ then it is established in a first step (S01) whether the first folding leaf door (2) and the second folding leaf door (3) carry out a closing movement; ▪ if the presence of a closing movement is confirmed, a second step (S02) is carried out, wherein it is queried here whether an object was detected within the sensor field (59) with the obstacle sensor (57), wherein if this is the case, the process continues with a third step (S03); however, if this is not the case, the process proceeds to a final termination step (S05); • wherein it is queried in the third step (S03) whether the first folding leaf door (2) and the second folding leaf door (3) are located within the activation range (62), wherein if this is the case, the closing movement of the first folding leaf door (2) and the second folding leaf door (3) is stopped or reversed in a fourth step (S04) and then the final termination step (S05) is carried out, ∘ or wherein the monitoring unit (23) is configured to carry out the following process: ▪ the process begins with an initial step (S10); ▪ it is established in a first step (S11) whether the first folding leaf door (2) and the second folding leaf door (3) carry out a closing movement and, if this is the case, ▪ it is established in a second step (S12) whether the first folding leaf door (2) and the second folding leaf door (3) are located within the activation range (62) and if this is not the case, ▪ the obstacle sensor (57) is deactivated in a third step (S13) and the process continues with the first step (S11), ▪ wherein if it is established in the second step (S12) that the first folding leaf door (2) and the second folding leaf door (3) are located within the activation range (62), the obstacle sensor (57) is activated in a fourth step (S14), wherein it is subsequently verified in a fifth step (S15) whether the obstacle sensor (57) has detected an obstacle, and wherein • if this is not the case, in a sixth step (S16), the process continues again with second step (S12), wherein • if, on the other hand, an obstacle is detected, the closing movement of the first folding leaf door (2) and the second folding leaf door (3) is stopped and / or reversed in a seventh step (S17).

2. The folding leaf door system (1) according to one of the preceding claims, characterised in that each leaf (24, 25) has a frame (10, 11), wherein a vertical profile element (12) of the frame (10, 11), at its centre of gravity, - has a first main moment of inertia of between 30000 mm4 and 60000 mm4, preferably 48470 mm4, - has a second main moment of inertia of between 60000 mm4 and 80000 mm4, preferably 73570 mm4, and - has a polar moment of inertia of between 120000 mm4 and 130000 mm4, preferably 122041 mm4.

3. The folding leaf door system (1) according to one of the preceding claims, characterised in that each leaf (24, 25) has a frame (10, 11), wherein a vertical profile element (12) of the frame (10, 11), at its centre of gravity, - has a first main moment of inertia of between 20000 mm4 and 40000 mm4, preferably 31934 mm4, - has a second main moment of inertia of between 50000 mm4 and 80000 mm4, preferably 65389 mm4, and - has a polar moment of inertia of between 85000 mm4 and 110000 mm4, preferably 97324 mm4.

4. The folding leaf door system (1) according to one of the preceding claims, characterised in that each leaf (24, 25) has a frame (10, 11), wherein a horizontal profile element (13) of the frame (10, 11), at its centre of gravity, - has a first main moment of inertia of between 85000 mm4 and 120000 mm4, preferably 102266 mm4, - has a second main moment of inertia of between 85000 mm4 and 120000 mm4, preferably 103497 mm4, and - has a polar moment of inertia of between 150000 mm4 and 250000 mm4, preferably 205763 mm4.

5. The folding leaf door system (1) according to one of the preceding claims, characterised by a guide rail (8), wherein the folding leaf door (2, 3) is guided in the guide rail (8), and wherein the guide rail (8) is formed from a material with a modulus of elasticity at 20°C of between 60 MPa and 80 MPa, preferably of 70 MPa.

6. The folding leaf door system (1) according to one of the preceding claims, characterised by a guide rail (8), wherein the folding leaf door (2, 3) is guided in the guide rail (8), and wherein the guide rail (8) is formed from a material with a shear modulus at 20°C of between 10 MPa and 40 MPa, preferably of 27 MPa.

7. The folding leaf door system (1) according to one of the preceding claims, characterised in that the frame (10, 11) has four profile elements (12, 13), wherein the four profile elements (12, 13) are connected to one another in a force-fitting manner, wherein a contact pressure between two profile elements (12, 13) is between 45,000-100,000 N.

8. The folding leaf door system (1) according to one of the preceding claims, characterised in that the filling element (22) has a thickness of 28-30 mm.

9. The folding leaf door system (1) according to one of the preceding claims, characterised in that the filling element (22) has a density of 2-3 g / cm3.

10. The folding leaf door system (1) according to one of the preceding claims, characterised in that the frame (10, 11) has a width of between 500 mm and 700 mm, preferably of 600 mm.

11. The folding leaf door system (1) according to claim 10, characterised by two folding leaf doors (2, 3) each with two leaves (24, 25) such that an opening width is between 2000 mm and 2800 mm, preferably 2400 mm.

12. The folding leaf door system (1) according to one of the preceding claims, characterised in that the leaves (24, 25) can be accelerated by the drive unit (4) for opening the folding leaf door (2, 3), wherein a maximum acceleration of the leaves (24, 25) is achievable after a travel path of the folding leaf door (2, 3) of at most one third, in particular of at most one quarter, of the total travel path of the folding leaf door (2, 3).

13. The folding leaf door system (1) according to claim 12, characterised in that the acceleration of the leaves (24, 25) in a travel path after the first quarter and before the last quarter, in particular after the first third and before the last third, can be lowered by the drive unit (4), in particular linearly, to zero.

14. The folding leaf door system (1) according to one of the preceding claims, characterised in that a maximum closing speed of the folding leaf door (2, 3) is at most half the maximum opening speed of the folding leaf door (2, 3).