Safety system for a door, in particular a lifting door, further in particular a fast-moving lifting door, comprising a drive, comprising a rotary tensioning device, and a door comprising the safety system

Abstract

The invention relates to a safety system (1) for a drive (50) of a door, in particular a lift door (100), further in particular a fast-moving lift door (100), comprising a rotary tensioning device (13), a driving wheel (11) and a driven wheel (10). The driving torque can be transmitted from the driving wheel (11) to the driven wheel (10) by means of the tensioning device (13). The safety system (1) comprises a blocking member (15) which, in a normal operating position in which the tensioning device (13) is intact, is disengaged from the driven wheel (10) and is kept pre-tensioned in the normal position by means of a pre-tensioning device (28) and a retaining device (20). The retaining device (20) is formed and constructed in such a way that, at least in the event of a breakage / tearing of the tensioning device (13), it releases the blocking member (15), and the pre-tensioning device (28) moves the blocking member (15) from the normal position to a blocking position in which at least the driven wheel (10) is blocked.

Description

Technical Field

[0001] The present invention relates to a safety system comprising a drive for a door, in particular a lifting door, further in particular a high-speed lifting door, comprising a rotary tensioning device, and the present invention relates to a door comprising the safety system. Background Art

[0002] CN2373548Y and DE1659481A disclose a safety system.

[0003] DE 10 2017 102 614 A1 discloses a device and a system for detecting a door leaf falling. The device employs a door leaf falling detection device, which is mounted on the door leaf and includes a device for detecting the acceleration of the door leaf falling detection device. If a fall is positively detected, for example, if the detected acceleration value exceeds an upper limit, a communication unit transmits a fall detection signal. With this fall detection device, appropriate braking devices can then be actuated to ensure that the door leaf stops if a fall is detected.

[0004] DE 202012001954 U1 discloses a drive for a rolling door with a safety gear. The drive comprises a continuously circulating transmission. Furthermore, the drive comprises a drive motor that directly drives a so-called safety gearbox. The safety gearbox includes a safety gear. The transmission runs from the output shaft of the safety transmission, which serves as the drive shaft for the drive, to a corresponding driven wheel on a winding shaft.

[0005] It is proposed to use sensors known per se to monitor the wear of the transmission and to stop the movement of the door by means of a door control system, for example in the event of excessive sagging.

[0006] Furthermore, centrifugally driven safety gears are known, in which a rotating element is coupled to, for example, a door drive shaft. A blocking body is driven in rotation along with the rotating element. When a certain speed is exceeded, the blocking body moves outward due to centrifugal force and, for example, enters a blocking recess, thereby preventing further rotation of the rotor shaft.

[0007] A tensioning device clamping device that is easy to assemble is known from JP 2008-38499 A.

[0008] From JP2008095333A and CN2286237Y, a safety system is known.

[0009] No. 5,706,552 A discloses a fall protection system for a door curtain, wherein a spring pretensioning bracket, after tearing the tensioning device by the spring pretensioning device, can displace a blocking element in such a way that a driven wheel of the door curtain drive can be blocked. Summary of the Invention

[0010] The object of the present invention is to provide a safety system for driving a door, in particular a lift door, comprising a drive, which has a rotary tensioning device and which makes it possible to detect a breakage / tear of the rotary tensioning device in a particularly simple and reliable manner. Furthermore, in the event of a detection, blocking of the driven wheel, in particular of a door curtain of a lift door, can be ensured reliably and particularly simply.

[0011] Furthermore, the safety system should be able to react quickly in order to minimize uncontrolled further lowering of the door curtain, in particular of a lift door, in the event of a breakage / tear of the rotary tensioning device and to provide "immediate or almost immediate" blocking of the door curtain.

[0012] Furthermore, the safety system according to the invention should be independent of an external energy supply and operate reliably, in particular autonomously.

[0013] Furthermore, it is an object of the present invention to provide a door, in particular a lift door, which is equipped with a safety system.

[0014] The safety system according to the present invention is a safety system for a door, in particular a lift door, and in particular a high-speed lift door, comprising a drive having a drive wheel, a driven wheel, and a rotary tensioning device. The drive torque can be transmitted from the drive wheel to the driven wheel by means of the tensioning device. The safety system further comprises a blocking member that, in a normal operating position in which the tensioning device is intact, is disengaged from the driven wheel and, in the normal position, is held pre-tensioned by a pre-tensioning device having a retaining portion and a retaining device. The retaining device is formed and constructed such that, at least in the event of a tear in the tensioning device, it releases the blocking member, and the pre-tensioning device moves the blocking member from the normal position to a blocking position in which at least the driven wheel is blocked. The retaining device is disposed on a motor mount of the drive motor.

[0015] Such a safety system is also configured such that the motor bracket is held in a pre-tensioned operating position by a tensioning device; and after the tensioning device tears, the motor bracket can automatically move by means of the pre-tensioning, thereby releasing the holding portion of the pre-tensioning device.

[0016] The safety system according to the invention for doors, in particular lifting doors, is particularly suitable for indirectly driven synchronizing / winding shafts of such doors, in particular lifting doors, whereby such drives are particularly space-saving but have a rotary tensioning device which has a certain inherent probability of failure (breakage / tearing).

[0017] The invention is particularly suitable for monitoring such tensioning devices which are embodied as toothed belts, chains or V-belts.

[0018] It is advantageous to use it as an alternative or supplement to other braking and safety devices on doors, particularly lift doors. A particular advantage of the safety system according to the invention is that, in the event of a malfunction of the tensioning device, the driven wheel is forced, immediately, and automatically blocked in at least one of its two possible rotational directions, thereby preventing, for example, a door curtain or a door curtain, particularly a lift door, from collapsing. The safety system's rapid reaction time is particularly advantageous, ensuring that unintentional acceleration of the door armor or curtain occurs only to a significant extent or in the period before the driven wheel is blocked. This keeps the blocking or braking forces low. Furthermore, the safety system according to the invention is particularly advantageously independent of external electrical, hydraulic, or pneumatic energy sources, thereby ensuring a particularly high level of operational safety.

[0019] According to a further development, a motor holder for a drive motor of the drive is provided as a mounting location for the retaining device, which is generally movable or pivotable relative to the frame within a limited range, for example, to enable pretensioning of the tensioning device. In the event of a tear in the tensioning device, the movement path or pivoting range of the motor holder can advantageously be designed such that, for example, the motor holder is slightly displaced or pivoted due to gravity, causing the retaining device to release the retaining portion of the blocking element. Consequently, the tear in the tensioning device and the resulting displacement of the motor holder trigger the triggering of the safety system.

[0020] In a preferred embodiment of the invention, the blocking member has a blocking element which, in the blocking position, cooperates with the driven wheel in a positively blocking manner.

[0021] The positive engagement of the blocking member with the driven wheel enables a particularly safe blocking which is independent of, for example, environmental conditions, which in contrast may influence, for example, the coefficient of friction between the blocking participants acting there in the case of a friction blocking, so that a purely friction blocking is less safe in terms of operation.

[0022] Furthermore, it can be advantageous if the blocking element is a tooth segment having a tooth radius which increases in a direction opposite to the meshing direction and which meshes with a corresponding toothing of the driven gear in the blocking state.

[0023] Designing the blocking element with tooth segments that have a radius that increases in the direction of engagement creates a self-reinforcing blocking effect. The pretensioning of the pretensioning device or blocking element must be designed and constructed so that the meshing of the tooth segments with the corresponding teeth of the driven wheel occurs due to the pretensioning. Once this meshing occurs, the blocking or further strengthening of the teeth automatically takes effect by transferring torque from the driven wheel to the tooth segments. The increasing radius of the tooth segments ensures an increasing radial force as the meshing increases, resulting in a greater radial force acting between the driven wheel and the blocking element as the meshing increases. This maintains the meshing of the tooth segments and the teeth of the driven wheel, preventing any existing frame elasticity of the frame in which the drive device and safety system are mounted from causing unintended disengagement.

[0024] Furthermore, it is advantageous if the pretensioning device is a lever arm which is pivotally deflected in the vertical direction relative to the lowest possible zero position, so that its pretensioning occurs in the form of potential energy and / or is a spring.

[0025] The above-described measures represent a particularly simple way to pre-tension the blocking member. In the simplest case, pre-tensioning of the blocking member is achieved by arranging the lever arm to pivot about the pivot axis from its lowest possible position. This results in the lever arm's center of gravity, or the weight of a different arm configuration, having a higher potential energy than its lowest point and, due to gravity, tending to move toward the lowest possible potential energy level upon release. Consequently, the corresponding pre-tensioning force is solely influenced by gravity and does not require any additional components. To support this, or as an alternative, the pre-tensioning device can be supplemented by a spring or formed independently.

[0026] For example, such a spring can be designed as a tension spring or a torsion spring, which supports or independently enables the movement of the blocking member from the pre-tensioned normal position towards the blocking position, or in any case until the blocking member engages with the driven wheel. This can also be achieved by suitably selected and arranged, for example, built-in compression springs.

[0027] Furthermore, the holding device can advantageously be provided as a seat which, in the event of a tear, releases the holding portion of the pretensioning device.

[0028] The above measures represent a simple way to maintain the pretensioning force on the blocking member. In the simplest case, the retaining device is thus a seat that assumes a different position in space depending on the presence or absence of the tensioning device, so that when the tensioning device is present, the seat is positioned so that it holds the retaining part of the pretensioning device, i.e., for example, the lever arm, in the pretensioned position.

[0029] In a further preferred embodiment, after the tensioning device has torn, the motor mount can be automatically moved pivotably relative to the drive frame, in particular the frame, by pretensioning, and the motor mount releases the retaining portion.

[0030] The pivotable mobility of the motor holder has proven to be particularly advantageous, since, compared to linear mobility, the friction or surface area between the motor holder and the connecting component moving relative to each other is lower, so that a reliable pivoting of the motor holder due to gravity can be ensured more reliably than in the case of a linear displacement.

[0031] Furthermore, it can be advantageous if the motor mount is prestressed relative to the drive frame by means of a spring device.

[0032] The aforementioned movability of the motor holder for the purpose of releasing the retaining portion of the blocking element can be assisted by a spring device or ensured solely by a spring device. The latter is particularly true if, for example, in the installation location of the drive, a pivotability in a direction predetermined by gravity is not possible, for example for reasons of space.

[0033] Furthermore, in order to pre-tension the motor mount, it may be advantageous to position the motor mount relative to the lowest zero position of the motor mount so that it has increased potential energy.

[0034] This represents the simplest form of motor mount pre-tensioning. This gravity-based pre-tensioning can be achieved by the fact that during normal operation of the safety system, the center of mass of the pivoting motor mount together with the drive motor is elevated compared to the lowest mechanically possible position, so that the pre-tensioning is gravity-based.

[0035] Furthermore, it is advantageous if the blocking member cooperates in a blocking manner with the driven wheel, preferably only in one rotational direction of the driven wheel.

[0036] This makes it possible, for example, to open the door curtain against the blocking direction when the safety system is triggered, for example by manually opening it. Despite the manual opening capability, the door armor cannot fall down, which helps to increase the safety of the lift door.

[0037] Furthermore, it is advantageous if the blocking element is arranged in its blocking position at least partially in the normal operating path of the intact tensioning device.

[0038] This ensures that when a torn tensioning device is replaced by a new, intact tensioning device, the new, intact tensioning device can only be installed when the blocking member and therefore the entire safety system are reset and re-tensioned and thus activated, because only in this case is the normal operating path of the tensioning device released and the latter does not collide with the blocking member.

[0039] Furthermore, it may be advantageous if the driven wheel is coupled to a winding shaft or synchronization shaft of a door, in particular a lift door, and if the safety system is constructed and formed such that a drop of the door curtain or door armoring is thereby blocked.

[0040] In this application, the safety system is particularly suitable for lift doors with rolling shutter curtains or spiral lift doors, wherein the curtain is guided in a spiral manner with its sides. In addition, the invention can be used for low-drop doors as well as vertical and horizontal slides.

[0041] Furthermore, the invention comprises a door, in particular a lifting door, comprising the above-described safety system.

[0042] In a special embodiment, the door, in particular the lifting door, is characterized in that the door, in particular the lifting door, is designed as a fast-running lifting door with a door curtain or door armor, wherein, during the intended operation of the door, in particular the lifting door, the opening speed of the door curtain or the door armor in some areas is greater than 1.0 m / s, preferably 1.5 m / s, particularly preferably 2.0 m / s, up to a maximum of 5.0 m / s, and the closing speed in some areas is at least greater than 0.3 m / s to 1.5 m / s, in particular greater than 0.5 m / s to 0.8 m / s.

[0043] The safety system according to the invention has proven itself for use on doors, particularly in fast-moving door configurations, and particularly as a supplement to other safety gear systems that are directly engaged with the door curtain or door armor. This is particularly due to the short reaction time from the tensioning device tearing off to the effective locking of the drive shaft. This prevents the impact of the door curtain / door armor becoming increasingly difficult to capture as the descent speed increases, and allows the synchronization shaft / winding shaft to be blocked at an early stage.

[0044] In one embodiment, the door is formed as a spiral lift door without a winding shaft, which has a synchronous shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The present invention will be described in more detail below with reference to the accompanying drawings by way of example, namely the application of a lifting door of the spiral lifting door type.

[0046] They are shown below:

[0047] Figure 1 : a partial perspective view of a lifting door according to the invention, having a drive including a safety system according to the invention, presented in a perspective view;

[0048] Figure 2 : A side view of the safety system according to the present invention in a normal position, wherein the tensioning device is intact;

[0049] Figure 3a : Partially transparent perspective view of the blocking member, in particular its retaining portion, interacting with the retaining device in the pretensioned position (normal operating position of the drive);

[0050] Figure 3b: Enlarged detail of the holding device and the holding portion;

[0051] Figure 4a : The above embodiment of the safety system according to the present invention is in a normal position with the tensioning device intact;

[0052] Figure 4b : The safety system according to the invention is in a blocking position in which the tensioning device is torn;

[0053] Figure 5 : Variant of the safety system in which the tensioning device forms the holding device. DETAILED DESCRIPTION

[0054] The features described can certainly also be used for other types of doors, in particular low-speed doors and vertical and side-moving doors. Equally, the present invention is applicable to the above-mentioned doors as low-speed doors and fast-moving doors.

[0055] In addition to being used with spiral doors, the present invention can also be used advantageously with so-called roller doors, in which the door curtain is wound on a winding shaft. Therefore, in this respect, the term lifting door used in the context of the embodiments should generally be understood as the door in the various embodiments described above.

[0056] The application of the safety system 1 according to the present invention on a lifting door 100 is as follows: Figure 1 As shown. The lift door 100 is formed as a spiral lift door and has a synchronization shaft 101 arranged above the door cutout 102. In the current design in which the lift door 100 is a spiral lift door, the synchronization shaft 101 (in the case of a lift door 100 of the type with a rollable door curtain, it can also be a winding shaft) is formed and configured to move up and down door armor 103, which can be made of, for example, a thin sheet or other rigid sections.

[0057] The door armour 103 is formed from a plurality of slats / segments 104. Each slat / segment is hinged to each other at its longitudinal edges.

[0058] The door armor 103 is guided laterally in guide rails (not shown), which are attached, for example, to a frame 105. At the upper end of the frame 105 in the vertical direction V, a synchronization shaft 101 extending in the horizontal direction is mounted, which is mounted and connected to the driven wheel 10 in a torque-transmitting manner.

[0059] The driven wheel 10 is part of the drive 50 for the door armor 103. In addition to the driven wheel 10, the drive 50 also has a drive wheel 11 connected to a drive motor 12. The drive wheel 11 driven by the drive motor 12 is connected to the driven wheel 10 via a rotary tensioning device 13 connected head to tail. The rotary tensioning device 13 connected head to tail can be, for example, a chain, a V-belt or a toothed belt. The drive wheel 11 and the driven wheel 10 are respectively sprockets, V-belt pulleys or toothed belt pulleys. The drive 50 also includes a blocking member 15 as a basic component of the safety system 1. The blocking member 15 has a blocking element 16 ( Figure 1 Not shown, see Figure 2 ), which is coupled to a lever arm 17. The lever arm 17 is rigidly connected to the blocking element 16 and is mounted so as to be pivotable relative to the frame 105 about a first pivot axis S1. The drive motor 12 is connected to a motor support 18, wherein the motor support 18 is arranged so as to be pivotable relative to the frame 105 about a second pivot axis S2, at least in some areas. To this end, the motor support 18 is fixed to the frame 105 or to a relatively immovable part relative to the frame 105 via a bearing block 19. The pivot axes S1 and S2 are, in particular, aligned parallel to the longitudinal motor axis of the drive motor 12 and the longitudinal axis of the winding shaft / synchronizing shaft 101.

[0060] Figure 1 The safety system 1 according to the invention is shown in a so-called normal position, i.e. the tensioning device 13 is intact, i.e. not torn / broken. Compared to this normal position, in the event of a tear / break of the tensioning device 13, the safety system 1 according to the invention can be moved to a blocking position in which the winding shaft / synchronizing shaft 101 is blocked. This blocking position is described below in conjunction with Figure 4b The description explains it in more detail.

[0061] The base 20a is provided on the motor bracket 18 as a holding device 20, which is hidden in the Figure 1 For the description of the holding device 20 using the base 20a as an example, please refer to the following Figure 3a 、 3b . Base 20a (Comparison Figure 3a , b) providing a surface 21, according to Figure 1 、 Figure 2 、 Figure 3a 、 3b and Figure 4aIn its normal position, retaining portion 22 can rest on this surface 21. In the embodiment according to these figures, retaining portion 22 is formed, for example, as a ball bearing 22a. In the normal position, i.e., in the operating state of actuator 50, ball bearing 22a rests on surface 21 and maintains lever arm 17, or its center of gravity, in an elevated and pivoted position relative to its lowest possible vertical position. As a result, lever arm 17, due to gravity, possesses a higher potential energy than in its undeflected, vertically lowest position. During normal operation of actuator 50 and safety system 1 (even in its normal position), this potential energy of lever arm 17 is maintained by base 20a, on which ball bearing 22a rests. Consequently, safety system 1, in particular its lever arm 17, and therefore the entire blocking member 15, is prestressed, i.e., arranged to be prestressed due to potential energy.

[0062] In this pre-tensioning arrangement, the blocking element 16 does not engage with the driven wheel 10 , so the driven wheel 10 can rotate freely in both possible directions of rotation, so that the door drive can move the door armor 103 up and down in the desired manner.

[0063] Blocking element 16 (compare Figure 2 ) is formed as a toothed segment 30. The toothed segment 30 has teeth 31 along its circumference, which can interact in a meshing manner with at least one toothed section 32 of the driven wheel 10. If the driven wheel 10 is configured as a sprocket or a toothed belt pulley, the toothed section 32 that is already present can be used as the toothed section 32. If the driven wheel 10 is configured as a V-belt pulley or a multi-V V-belt pulley, for example, it is advantageous to provide a corresponding toothed section 32, which is arranged, for example, adjacent to a raceway of a V-belt or a multi-V V-belt pulley that can mesh with the toothed section 30.

[0064] In the area closest to the driven wheel 10 in its normal position, the tooth segment 30 has a smaller tooth radius relative to the pivot axis S1. The distance of the teeth from the first axis of rotation S1 increases eccentrically against the meshing direction E, so that individual teeth further away against the meshing direction E have a greater radial distance (radius) from the axis of rotation S1 than the first tooth in the meshing direction E. This increase in radius is eccentric and continuous from the first to the last tooth of the tooth segment 30.

[0065] The tooth segment 30 of the blocking element 16 is attached to the frame 105 , for example, via a bearing bracket 33 , so as to be pivotable about a first pivot axis S1 .

[0066] Furthermore, a stop 34 is provided, against which the lever arm 17 rests in the blocking position of the safety system 1 , as will be described below.

[0067] In the above-described embodiment of the safety system 1 according to the invention, the lever arm 17 and its retaining portion 22 (e.g., in the form of a ball bearing 22a) together with the base 20a as the retaining device 20 thus constitute a pretensioning device 28, by means of which the lever arm 17 is kept pretensioned in a pretensioned state with respect to the potential energy of the lever arm 17 in the normal position of the safety system 1. As will be described below, in the event of a triggering, in order to activate the blocking position, the pretensioning of the pretensioning device 28 is released and, as a result, an automatic actuation / rotational displacement of the blocking element 16 about the axis of rotation S1 can occur due to the potential energy stored in the lever arm 17.

[0068] Other possible embodiments of the pretensioning device 28, not shown in the figures, may be, for example, a spring device, such as a torsion spring, which elastically pretensions the blocking element 16 in a supporting manner about the first pivot axis S1 by means of spring energy, or as an alternative to pretensioning by means of potential energy. In this case, the spring device would be a supporting part of the pretensioning device 28 or would itself be the pretensioning device 28.

[0069] In the following, the operation of the security system 1 according to the present invention will be referred to Figure 4a (normal position) and 4b (which shows the blocked position) are explained.

[0070] In accordance with Figure 4a 、 4b In the diagram, the structure of the safety system 1 is the same as that described above. Figure 1 、 Figure 2 Same as Figure 1 The opposite of and corresponding to Figure 2 , omitting the coverage Figure 1 The cover of the blocking element 16 and the stopper 34 is shown.

[0071] Figure 1 The normal position of the safety system 1 according to the invention is shown, in which the tensioning device 13 is intact and connects the driving wheel 11 to the driven wheel 10 in the desired torque transmission manner. The tensioning device 13 is formed as a toothed belt, for example. In this position, the lever arm 17 is in its pre-tensioned position, the holding part 22 (ball bearing 22a, hidden in the Figure 4a ), resting on the holding device 20, in particular on the base 20a. The motor support 18 is in a position suitable for this purpose, and the tensioning device 13 is appropriately tensioned, for example by means of a tensioning screw 35, which supports the motor support 18 in a pre-tensioned manner, for example, against the frame 105. In this position, the blocking element 16 is arranged so that none of the teeth of the toothed segment 30 meshes with the corresponding teeth of the driven wheel 10. In this condition, the door curtain / door armor 103 ( Figure 4a Appropriate up and down movement (not shown).

[0072] from Figure 4a Initially, we will now explain what happens when the tensioning device 13 breaks or tears. Once the tensioning device 13 breaks or tears, the motor bracket 18 can move in the direction of arrow 200 due to gravity by pivoting about the second pivot axis S2. Therefore, during normal operation, the tensioning device 13 maintains the pretensioning of the tensioning screw 35 by the motor bracket 18. If the tensioning device 13 tears, the motor bracket 18, along with the drive motor 12, moves in the direction of arrow 200 due to gravity. The retaining device 20, or base 20a, also moves in the direction of arrow 201, with the second rotation axis S2 serving as the rotation pole. As a result, the surface 21 of the base 20a, below the ball bearing 22a, or below the retaining portion 22, is also displaced, so that after a certain distance, the ball bearing 22a is no longer supported by the surface 21. At this point, the pivoting movement of the lever arm 17, together with the blocking element 16, begins in the direction of arrow 202, with the first pivot axis S1 serving as the rotation pole. This causes the teeth of blocking element 16 to engage the teeth of driven wheel 10 after a certain pivoting motion, which occurs automatically due to gravity. Simultaneously, the downwardly moving door curtain / door armor 103 applies a torque in the direction of arrow 203 to driven wheel 10, which causes blocking member 15 (blocking element 16 and lever arm 17) to move further in the direction of arrow 202, even beyond the point where the center of gravity of blocking member 15 has reached its vertical lowest point. As the tooth radius increases with progressive pivoting in the direction of arrow 202, the corresponding radial contact pressure between blocking element 16 and driven wheel 10 increases.

[0073] The lever arm 17 is driven by the driven wheel 10 and moved into its mechanically possible end position (blocking position), as shown Figure 4b As shown, a portion of the lever arm 17 rests on the stop 34. In such a position, further rotation of the driven wheel 10 in the direction of the arrow 203 is no longer possible, ie is blocked, and further lowering of the door curtain / door armor 103 is blocked.

[0074] Furthermore, in this position, the lever arm 17 is arranged such that it lies in an imaginary normal operating path 205 of the intact tensioning device 13 or in accordance with Figure 4b In the diagram of , the normal operating path 205 through the imaginary. In other words, when Figure 4a and 4b When viewed in a direction perpendicular to the paper, the lever arm 17 is located in the plane of the tensioning device 13.

[0075] Despite Figure 4b The blocking position is achieved in Figure 4bAs shown, it is still possible to manually raise or lower the door curtain / door armor 103, for example, with the result that the driven wheel 10 is driven in the direction opposite to the direction of arrow 203, thereby tending to move the blocking member 15 from the position according to Figure 4b Remove the blocking position. Figure 4b The return to the normal position is done in the opposite direction of arrow 202. If the blocking member 15 subsequently releases the driven wheel 10 from a certain relative position, the driven wheel 10 can be further rotated, for example manually, in the opposite direction of arrow 203, which ensures that the door curtain / door armor 103 is raised at the lifting door 100. The security system 1 according to the invention thus blocks only one of the two possible rotation directions shown in the embodiment example, namely the direction of arrow 203.

[0076] If, in the event of a tear in the tensioning device 13, a new, intact tensioning device 13 is to be inserted during maintenance work, the lever arm 17 must be moved out of its locking position, e.g. Figure 4b As shown, it would otherwise be impossible to insert a new tensioning device 13 because the lever arm 17 passes through the normal operating path 205 .

[0077] This ensures that the blocking member 15 is removed from the normal operating path 205 by appropriate maintenance personnel to place a new tensioning device 13 and, in this connection, the interaction of the retaining portion 22 with the retaining device 20 is reestablished and the safety system 1 is therefore in the triggerable normal position again.

[0078] As a result, the safety system 1 according to the invention is a mechanically particularly simple, reliable and in any case non-destructively operating safety system 1 which can in particular be returned to its original state without further replacement of components (except for the torn tensioning device 13). In the event of a tripping due to a breakage of the tensioning device 13, no further components have to be replaced.

[0079] Furthermore, the safety system according to the invention can be operated without an external energy supply system. In particular, no electrical, hydraulic or pneumatic energy supply system is required.

[0080] exist Figure 5 In the variant of the safety system 1 shown, for example, a roller 51 can be located at the free end of the lever arm 17, which uses the tensioning device 13 itself, in particular - as shown - its inner or outer side, as the retaining device 20. In the event of a tear in the tensioning device 13, the inner side of the tensioning device 13, which is no longer in the tensioned state, then releases the above-mentioned roller 51, and the blocking member 15 can be moved from its normal position similar to that in the above-mentioned embodiment, via the meshing position, i.e. the position in which the first tooth of the blocking element 16 meshes with the driven wheel 10, into its blocking position and thus acts in a blocking manner on the driven wheel 10 and the winding shaft or synchronization shaft 101.

[0081] Reference Mark List

[0082] 1. Security System

[0083] 10 driven pulley

[0084] 11 driving wheels

[0085] 12 drive motor

[0086] 13 driven pulley

[0087] 15. Blocking member

[0088] 16 blocking element

[0089] 17 Lever arm

[0090] 18 Motor bracket

[0091] 19 bearing seat

[0092] 20 Holding device

[0093] 20a Base

[0094] 21 Surface

[0095] 22 Keep part

[0096] 22a Ball bearing

[0097] 28 Pre-tensioning device

[0098] 30 tooth segments

[0099] 31 teeth

[0100] 32 teeth

[0101] 33 bearing bracket

[0102] 34 Stopper

[0103] 35 tensioning screw

[0104] 50 Drive

[0105] 51 Roller

[0106] 100 lift door

[0107] 101 Synchronous shaft / Winding shaft

[0108] 102 Door Cutout

[0109] 103 Door Curtain / Door Armor

[0110] 104 slices / segments

[0111] 105 Framework

[0112] 200, 201, 202, 203 Arrow directions

[0113] 205 Normal operation path

[0114] E Joint direction

[0115] V vertical direction

[0116] S1 First pivot axis

[0117] S2 Second pivot axis

Claims

1. A safety system (1) for a door comprising a drive (50), the drive (50) having a drive wheel (11), a driven wheel (10) and a rotary tensioning device (13); in, The driving torque can be transmitted from the driving wheel (11) to the driven wheel (10) through the rotary tensioning device (13); wherein the safety system (1) further comprises a blocking member (15) which, in a normal operating position in which the rotary tensioning device (13) is intact, is disengaged from the driven wheel (10) and is maintained pre-tensioned in the normal position by means of a pre-tensioning device (28) having a retaining portion and a retaining device (20); The retaining device (20) is formed and constructed in such a way that at least in the event of a breakage / tearing of the rotary tensioning device (13), it releases the blocking member (15), and the pretensioning device (28) moves the blocking member (15) from the normal position to a blocking position in which at least the driven wheel (10) is blocked; Wherein, the retaining device (20) is arranged on a motor bracket (18) of the drive motor (12); It is characterized in that the motor bracket (18) is held in a pre-tensioned operating position by the rotary tensioning device (13); after the rotary tensioning device (13) is torn, the motor bracket (18) can automatically move by means of pre-tensioning, thereby releasing the holding part (22) of the pre-tensioning device (28).

2. The safety system according to claim 1, wherein: The blocking member (15) has a blocking element (16) which cooperates with the driven wheel (10) in a positive blocking manner in the blocking position.

3. The safety system according to claim 2, characterized in that The blocking element (16) is a tooth segment (30) having a gear radius that increases in a direction opposite to the engagement direction (E); and in the blocking condition, the blocking element (16) meshes with a corresponding tooth section (32) of the driven wheel (10).

4. The safety system according to claim 1, wherein: The pretensioning device (28) is a lever arm (17) which is pivotally deflected in the vertical direction (V) relative to the lowest zero position so that its pretensioning occurs in the form of potential energy; and / or the pretensioning device (28) is a spring.

5. The security system according to claim 1, wherein: The retaining device (20) is a base (20a) which, in the event of tearing, releases the retaining portion (22) of the pretensioning device (28).

6. The security system according to claim 1, wherein: The motor mount (18) is pivotally movable relative to the frame (105) by means of prestressing.

7. The security system according to claim 1, wherein: In order to prestress the motor mount (18), the motor mount (18) is prestressed relative to the frame (105) by a spring device.

8. The security system according to claim 1, wherein: In order to prestress the motor mount (18), the motor mount (18) has an increased potential energy compared to the lowest zero position of the motor mount (18).

9. The security system according to claim 1, wherein: The blocking member (15) preferably cooperates with the driven wheel (10) in a blocking manner only in one rotational direction of the driven wheel (10).

10. The security system according to claim 1, wherein: The blocking member (15) in its blocking position is at least partially arranged in the normal operating path (205) of the intact rotary tensioning device (13).

11. The security system according to claim 1, wherein: The driven wheel (10) is connected to the winding shaft or synchronization shaft (101) of the door; and the safety system (1) is constructed and formed in a manner to prevent the door curtain or door armor (103) from falling.

12. The security system according to claim 1, wherein: The door is a lift door (100).

13. A door comprising a security system (1) according to any one of claims 1 to 12.

14. The door according to claim 13, wherein The door is formed as a lifting door (100) with a door curtain or door armor (103), wherein, in the intended operation of the door, the opening speed of the door curtain or door armor at least in some areas is greater than 1.0 m / s up to a maximum of 5.0 m / s, and the closing speed at least in some areas is greater than 0.3 m / s to 1.5 m / s.

15. The door according to claim 14, characterized in that The opening speed of the door curtain or door armor at least in certain areas is greater than 1.5 m / s up to a maximum of 5.0 m / s, and the closing speed at least in certain areas is greater than 0.3 m / s to 1.5 m / s.

16. The door according to claim 14, wherein The opening speed of the door curtain or door armor at least in some areas is greater than 2.0 m / s up to a maximum of 5.0 m / s, and the closing speed at least in some areas is greater than 0.3 m / s to 1.5 m / s.

17. The door according to claim 14, wherein The closing speed, at least in certain areas, is greater than 0.5 m / s to 0.8 m / s.

18. The door according to claim 13, wherein The door is formed as a spiral lift door with a synchronous shaft (101) and no winding shaft.

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