Door drive with two drivers that can be displaced independently of one another

Abstract

The invention relates to a door drive for opening and closing a corresponding elevator door leaf of an elevator door of an elevator. The door drive according to the invention has: a first driver (42) which acts on a first coupling element (36) arranged on the first elevator door leaf in order to open the first elevator door leaf of the first elevator door; and a second driver (48) which acts on a second coupling element (38) arranged on the first elevator door leaf in order to close the first elevator door leaf of the first elevator door. The first driver (42) and the second driver (48) can be displaced in the opening direction (32) and the closing direction (34) of the first elevator door by means of the drive unit (24). According to the invention, the drive unit (24) has a first drive (40) for displacing the first driver (42) and a second drive (50) for displacing the second driver (48), and the first driver (42) and the second driver (48) can be displaced independently of one another in an opening direction (32) and a closing direction (34) by means of the drive unit (24).

Description

Technical Field

[0001] The invention relates to a door drive for opening and closing corresponding elevator door leaves of an elevator door of an elevator according to the preamble of claim 1 . Background Art

[0002] EP 0 332 841 B1 introduces a door drive for opening and closing corresponding elevator door leaves of an elevator door. One elevator door leaf is designed as a car door leaf of a car door, and the other elevator door leaf is designed as a shaft door leaf of a shaft door. The door drive has: a first driver, which acts on a first coupling element arranged on the shaft door leaf to open the shaft door leaf; and a second driver, which acts on a second coupling element arranged on the shaft door leaf to close the shaft door leaf. The first driver and the second driver can be displaced in the opening direction and the closing direction of the elevator door by means of a drive unit. Two drivers in the form of driver rails are part of the coupling mechanism, and the distance between the two drivers can be adjusted by a parallelogram guide having two adjustment elements that can be pivoted about a pivot axis each. Therefore, the two driver rails can be in a non-deployed position and a deployed position. In the non-deployed position, the two driver rails can be guided through between the two coupling elements of the shaft door leaf so that the elevator car can pass through the floor and thus the shaft door. When the elevator car is correctly positioned at floor level, the two driver rails are located between two coupling elements arranged side by side on the shaft door leaf and can be guided (deployed) laterally close to the coupling elements in order to unlock the shaft door leaf on the one hand and to transmit the opening and closing displacement of the car door leaf to the shaft door leaf in a gap-free and synchronous manner on the other hand. As a result, the two driver rails are displaced from their non-deployed position into their deployed position. The distance adjustment between the two driver rails is achieved by a door drive unit fixed to the car door frame via a drive mechanism acting in a straight line (e.g. via a belt drive), which also causes the opening and closing displacement of the car door leaf.

[0003] In order for the described process of driving through the shaft door and the coupling to the shaft door leaf and the subsequent opening of the shaft door to proceed smoothly, the coupling elements on the shaft door leafs of the individual floors must be aligned very precisely, in particular symmetrically with respect to the driver rails. In particular, the distances between all coupling elements in the opening or closing direction and the driver rails in the non-deployed position must be within a precisely specified range of, for example, + / - mm. This manual alignment by a technician during elevator installation or maintenance is very time-consuming, especially in multi-storey buildings. Summary of the invention

[0004] In contrast, the object of the present invention is in particular to provide a door drive which does not require time-consuming adjustment work so that an elevator installation with a door drive according to the invention can be installed and maintained quickly and cost-effectively. This object is achieved according to the invention by a door drive having the features of claim 1.

[0005] According to the present invention, a door drive for opening and closing corresponding elevator door leaves of an elevator door, wherein the elevator door leaves are in the form of a car door leaf of a car door and a corresponding shaft door leaf of a shaft door, the door drive has a first driver, which acts on a first coupling element arranged on the first elevator door leaf to open the first elevator door leaf of the first elevator door; and a second driver, which acts on a second coupling element arranged on the first elevator door leaf to close the first elevator door leaf of the first elevator door. The first driver and the second driver can be displaced in the opening direction and the closing direction of the first elevator door by means of a drive unit. According to the present invention, the drive unit has a first drive for displacing the first driver and a second drive for displacing the second driver, and the first driver and the second driver can be displaced in the opening direction and the closing direction independently of each other by means of the drive unit.

[0006] The feature of being able to displace the two drivers independently of one another makes it possible in particular that the door drive can reliably open the first elevator door leaf even when the distance between the first coupling element and the first driver differs significantly from the distance between the second coupling element and the second driver when the elevator door is closed. This eliminates the need for a precise and time-consuming adjustment of the coupling elements. For example, it is sufficient for the actual position of the first elevator door leaf in its closed position to deviate from the theoretical position by 2 cm to 4 cm in the opening direction or in the closing direction. More generally, a door drive with two drivers that can be displaced independently of one another can be used more flexibly and more reliably than a door drive with coupled drivers. Another advantage of the door drive according to the invention is that not all shaft doors on the floors served by the elevator have to be designed identically. The independent displacement of the two drivers allows shaft doors of different designs to be opened and closed.

[0007] The elevator door can have a door leaf that opens only in one direction, a so-called side-opening single-leaf door, or a door leaf that opens from the center outwards. For an elevator door that opens from the center, two door drives are provided in particular. It is assumed below that the door leaf of the elevator door can only be opened in one direction, namely in the opening direction. The described door drive can be transferred to an elevator door that opens from the center with only minor adjustments that are easy for a person skilled in the art to realize.

[0008] Corresponding elevator door leaf or corresponding elevator door should be understood here as: when the elevator car stops at a floor, the elevator door leaf or elevator door opens and closes together. When the elevator car stops on the floor, the corresponding elevator door leaf and the corresponding elevator door are arranged front and back in the horizontal direction.

[0009] The first and second drivers have in particular an elongated narrow basic shape and are designed, for example, as elongated rods. In particular, the first and second drivers are oriented parallel to the displacement direction of the elevator car and thus perpendicularly to the opening and closing direction of the elevator door, which in particular extends horizontally. The elongated shape enables the already familiar function of starting to open the elevator door before the elevator car reaches the final position of the floor.

[0010] The first and second coupling elements and optionally other coupling elements are designed in particular as rollers. The rollers are arranged so that they can rotate freely about a rotation axis oriented perpendicularly to the corresponding car door leaf. As a result, when the elevator door is opened prematurely as described above, the driver can roll on the coupling elements designed as rollers without generating too much resistance.

[0011] The action of the driver of the door drive on the coupling element arranged on the elevator door leaf is understood to mean that the driver exerts a force on the corresponding coupling element and displaces the coupling element in the opening direction or the closing direction. In addition, the coupling element can also perform a movement in a direction different from the opening and closing direction, which movement is used, for example, to unlock the lock of the elevator door.

[0012] As mentioned above, the first drive member and the second drive member can be independently displaced in the opening direction and the closing direction, i.e., in particular along the horizontal direction. This means that there is no mechanical connection between the two drives, thereby realizing the independent displacement introduced. Therefore, the first drive member and the second drive member can be displaced in the opening direction and the closing direction separately. In particular, the two drives are displaced along a common straight line. Thus, although certain restrictions are caused to the displacement of the two drives relative to each other, there is no influence on the independent displacement mentioned above. In this case, the two drives can approach each other until the two drives touch or abut against each other.

[0013] In one design of the invention, a first coupling element arranged on a first elevator door leaf of a first elevator door can be displaced in a first unlocking direction different from the opening direction and the closing direction when displaced in the opening direction. The first coupling element is mechanically coupled to a first lock of the first elevator door in such a way that the first lock can be unlocked by said displacement of the first coupling element in the first unlocking direction. Thus, the first elevator door can be advantageously unlocked by the interaction of the first driver and the first coupling element, and no separate actuator is required for unlocking the first elevator door.

[0014] In its locked position, the first lock fixes the first elevator door leaf, on which the first driver is arranged, for example relative to the frame of the corresponding first elevator door. When the first lock is unlocked, i.e. has been brought into its unlocked position, the elevator door leaf can be displaced relative to the frame and the elevator door can thus be opened.

[0015] In particular, the first coupling element can be displaced in the first unlocking direction only when the first elevator door is completely closed and the first coupling element is therefore in a corresponding closed position.

[0016] The first coupling element can be arranged, for example, on a rod which can rotate about an axis of rotation extending perpendicularly to the opening direction and perpendicularly to the first unlocking direction. The rod is designed in such a way that it can take up a position in which the first lock connected to the rod by the connecting rod is locked, without the need for interaction with the first carrier, due to its weight distribution. When the first carrier acts on the first coupling element in the opening direction, the first coupling element is displaced not only in the opening direction but also in the first unlocking direction perpendicular to the opening direction. This causes the rod to rotate about the axis of rotation and the displacement of the first coupling element is transmitted to the first lock via the connecting rod, thereby unlocking the first lock.

[0017] It is also possible to operate the first lock of the elevator shaft door independently of the coupling element, for example by means of an actuator or an electromagnet, in order to lock and unlock the first lock.

[0018] In one design of the present invention, the first driver acts on a third coupling element arranged on the second elevator door for opening a second elevator door leaf of the second elevator door corresponding to the first elevator door leaf, and the second driver acts on a fourth coupling element arranged on the second elevator door for closing the second elevator door leaf of the second elevator door. That is, not only the first elevator door is opened and closed by two drivers, but also the second elevator door is opened and closed by two drivers. Thus, no separate drive is required to shift the second elevator door leaf of the second elevator door.

[0019] The third and the fourth coupling element are designed in particular similarly to the first and the second coupling element. The drive unit has in particular a first drive for displacing the first entrainment member and a second drive for displacing the second entrainment member. The third and the fourth coupling element can be arranged directly on the second elevator door leaf. The third and the fourth coupling element can also be arranged on a component of the second elevator door, which is permanently connected to the second elevator door leaf. Such a component can be, for example, a so-called suspension carriage, on which the second elevator door leaf is suspended.

[0020] In one design of the invention, the second elevator door leaf of the second elevator door corresponding to the first elevator door leaf is permanently coupled to the drive unit and can therefore be directly displaced in the opening direction and in the closing direction by means of the drive unit. Thus, no coupling element is required on the second elevator door leaf of the second elevator door.

[0021] A permanent connection of the second elevator door leaf to the drive unit is understood to mean that there is a drive connection which is not interrupted during normal operation of the elevator, for example by a connection to the rotor of a linear motor of the drive unit or by means of a chain or belt between the drive unit and the second elevator door leaf. The drive connection is therefore not realized via a driver and a coupling element.

[0022] The drive unit has in particular a first drive for displacing the first carrier, a second drive for displacing the second carrier, and a third drive for displacing the second door leaf of the second elevator door. This enables particularly flexible displacement of the two carriers and the second elevator door leaf.

[0023] In one embodiment of the invention, at least two drives of the drive unit are designed as linear motors. The linear motors have a common stator and a rotor in each case. The rotors can be displaced independently of one another along the common stator. This advantageously requires only one stator for two or three linear motors.

[0024] The drive unit may also be equipped with a motor with a rotating output shaft. Then, each electric motor is connected to the driver by a chain or a belt, and if necessary, is also connected to the second elevator door leaf of the second elevator door.

[0025] In one design of the invention, the first carrier can be displaced in a second unlocking direction different from the opening direction and the closing direction by contact with the first coupling element or the third coupling element. The first carrier is also mechanically coupled to the second lock of the second elevator door in such a way that the second lock is unlocked via said displacement of the first carrier in the second unlocking direction. This allows the second elevator door to be unlocked advantageously by the interaction of the first carrier and the first or third coupling element, and no separate actuator is required for unlocking the second elevator door.

[0026] Similar to the first lock described above, the second lock fixes the second elevator door leaf of the second elevator door in its locked position, for example relative to the frame of the corresponding elevator door. When the second lock is unlocked, i.e. into its unlocked position, the elevator door leaf can be displaced relative to the frame and the elevator door can thus be opened.

[0027] The first entrainment member can in particular only be displaced in the second unlocking direction when the second elevator door is completely closed and the first entrainment member is therefore in a corresponding closed position.

[0028] The displacement of the first driver in the second displacement direction should be understood as follows: at least a part of the first driver is displaced in the second displacement direction. For example, the first driver can be designed to be divided into two parts. For example, an elongated abutting element is connected to the base element by two pivot rods. Based on its own weight, the abutting element is in a position of maximum distance from the base element without applying any force. The base element can be displaced in the opening and closing direction by the drive unit. Once the abutting element abuts against the first or third coupling element by the corresponding displacement of the base element in the opening direction, the abutting element will be pivoted toward the base element by the above-mentioned pivot rod. Here, the abutting element is also displaced perpendicular to the opening direction, and therefore displaced in the second unlocking direction. The displacement in the second unlocking direction is transmitted to the second lock by the connecting rod, and then the second lock is unlocked.

[0029] It is also possible to operate the first lock of the elevator shaft door independently of the coupling element, for example by means of an actuator or an electromagnet, in order to lock and unlock the first lock.

[0030] In one embodiment of the invention, the first elevator door is designed as a shaft door and the second elevator door is designed as a car door. The door drive is therefore arranged on the elevator car, in particular on the frame of the car door, and is displaced between floors together with the elevator car. As a result, only one door drive is required, since it can be displaced with the elevator car to the respective shaft door and thus open and close the shaft door.

[0031] However, it is also possible that the first elevator door is designed as a car door and the second elevator door is designed as a shaft door. In this case, the door drive is arranged on the shaft door, in particular on the frame of the shaft door. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Other advantages, features and details of the present invention will become apparent from the following description of embodiments and the accompanying drawings, in which identical or functionally equivalent elements are provided with identical reference numerals. The accompanying drawings are schematic diagrams only and are not drawn to scale.

[0033] in:

[0034] Figure 1 A car door with a door drive of an elevator car of an elevator is shown, wherein the car door leaf of the car door is in the closed state,

[0035] Figure 2 Show Figure 1 A car door in which the car door leaf is partially opened,

[0036] Figure 3 A second embodiment of a car door with a door drive of an elevator car of an elevator is shown,

[0037] Figure 4A mechanically operated first lock for a shaft door leaf of a shaft door is shown, and

[0038] Figure 5 A mechanically operated second lock for the car door leaf of the car door is shown. DETAILED DESCRIPTION

[0039] Figure 1 and Figure 2 Schematically shown is a door drive 12 for a side-opening single-leaf door mounted on an elevator car 10 of an elevator (not shown in detail). The elevator car 10 has a door opening 14, which can be closed by a car door leaf 16 of a car door 17. The door drive 12 is arranged on a door carrier 18 fixed to the elevator car 10. The car door leaf 16 is fixed to a suspension carriage 20, which can be displaced horizontally along a guide rail 22 fixed to the door carrier 18 and can be moved by a drive unit 24 between a door leaf closed position and a door leaf open position.

[0040] The drive unit 24 has an elongated stator 26 extending parallel to the guide rail 22. The stator 26 forms a first linear motor 30 together with a first rotor 28. The first rotor 28 can be displaced along the stator 26 by corresponding actuation of a control unit (not shown). The first rotor 28 is fixedly and thus permanently connected to the suspension carriage 20 and is therefore coupled to the suspension carriage 20, so that the suspension carriage 20 and thus also the car door leaf 16 can be displaced directly by the first linear motor 30 and thus also by the drive unit 24 to open in an opening direction 32 and to close in a closing direction 34. The opening direction 32 and the closing direction 34 extend horizontally and parallel to the guide rail 22 and the stator 26.

[0041] The door drive 12 is used not only to open and close the car door leaf 16, but also to open and close the shaft door leaf 37 of the shaft door 39 corresponding to the car door leaf 16 using the first coupling element 36 and the second coupling element 38. The shaft door 39 is represented by the shaft door leaf 37 and the two coupling elements 36 and 38 shown in dashed lines. The two coupling elements 36 and 38 are designed as rollers and are arranged so that the two coupling elements can rotate freely around a rotation axis oriented perpendicular to the shaft door leaf 37. The shaft door 39 can be called the first elevator door, and the shaft door leaf 37 can be called the first elevator door leaf. The car door 17 can be called the second elevator door, and the car door leaf 16 can be called the second elevator door leaf.

[0042] The drive unit 24 has a second rotor 40, on which an elongated first driver 42 is arranged. The second rotor 40 can be displaced along the stator 26 under corresponding control similarly to the first rotor 28, and together with the stator 26 forms a second linear motor 44. The drive unit 24 also has a third rotor 46, on which an elongated second driver 48 is arranged. The third rotor 46 can be displaced along the stator 26 like the first rotor 28 and the second rotor 40, and together with the stator 26 forms a third linear motor 50. Thus, the three linear motors 30, 44 and 50 have a common stator 26. Here, the second rotor 40 and the third rotor 46 as well as the first driver 42 and the second driver 48 can be displaced along the stator 26 independently of one another.

[0043] The first and second drivers 42, 48 are oriented parallel to the displacement direction 51 of the elevator car 10 and are therefore oriented perpendicularly to the horizontally extending opening direction 32 and closing direction 34. The elongated shape enables the shaft door leaf 37 to start opening before the elevator car 10 reaches its final position on the floor.

[0044] exist Figure 1 In the embodiment of the present invention, the car door leaf 16 and the corresponding shaft door leaf 37 are completely closed. The two drivers 42 and 48 are positioned in such a way that they can be guided between the two coupling elements 36 and 38 in the displacement direction 51 of the elevator car 10. As a result, the elevator car 10 can be displaced past floors and thus past the shaft door with the shaft door leaf without contact between the door drive 12 and the shaft door leaf. Figure 1 Starting from the position shown in FIG, the car door leaf 16 and the corresponding shaft door leaf 37 can be opened.

[0045] The first driver 42 and the first coupling element 36 are arranged relative to one another in such a way that, as soon as the elevator car 10 is in the final position on the floor or just before the elevator car is in the final position on the floor, the first driver 42 can act on the first coupling element 36 in such a way that the shaft door leaf 37 can be displaced in the opening direction 32 by the first driver 42. Then, the first driver 42 acts as Figure 2 The second linear motor 44 is shown to abut against the first coupling element 36 and transmit the force exerted by the second linear motor 44 to the coupling element 36 in the opening direction 32. Figure 2 Such a positioning of the first entrainment member 42 relative to the first coupling element 36 is shown in FIG, wherein the car door leaf 16 and the corresponding shaft door leaf 37 are partially opened.

[0046] In order to Figure 1To open the shaft door leaf, starting from the position shown in the figure, the first driver 42 is displaced in the opening direction 32 by means of the second linear motor 44 until the first driver abuts against the first coupling element 36. When further displacement occurs in the opening direction 32, the first driver 42 acts on the first coupling element 36 and displaces the first coupling element 36 and thus the shaft door leaf 37 in the opening direction 32. As a result, the shaft door leaf 37 is opened. At the same time, the car door leaf 16 is opened synchronously with the shaft door leaf 37 by means of the first linear motor 30.

[0047] Before the shaft door leaf 37 and the car door leaf 16 are opened, the shaft door leaf is opened by means of an actuator. Figure 1 and Figure 2 A first lock (not shown) and a second lock (also not shown) of the car door leaf 16 are also shown.

[0048] In order to close the shaft door leaf 16 again, a force is exerted on the second driver 38 in the closing direction 34 by the second driver 48 which can be displaced by the third linear motor 50. The second driver 48 thus acts on the second driver 38 and thus on the shaft door leaf 37 in the closing direction 34 and moves the shaft door leaf back to the original position. Figure 1 At the same time, the car door leaf 16 is closed synchronously with the shaft door leaf 37 by means of the first linear motor 30. After the shaft door leaf 37 and the car door leaf 16 are closed, the two drive members 42 and 48 are displaced toward each other so that the two drive members also occupy Figure 1 , in which the two drivers can be guided through between the two coupling elements 36 and 38. Finally, the first lock of the shaft door leaf 37 is locked with the second lock of the car door leaf 16.

[0049] Figure 3 The door drive device 112 shown in FIG. Figure 1 and Figure 2 The door operators 12 in FIG. 1 are designed very similarly, so only the differences between the two door operators are discussed.

[0050] In accordance with Figure 3In the door drive 112 of , the car door leaf 116 is not permanently connected to the drive unit 124. Instead, a third coupling element 141 and a fourth coupling element 143 are arranged on the suspension carriage 120 and thus on the component of the car door 117 which is permanently connected to the car door leaf 116. The third coupling element 141 is designed and arranged similarly to the first coupling element 136 on the shaft door leaf 137, and the fourth coupling element 143 is designed and arranged similarly to the second coupling element 138 on the shaft door leaf 137. Therefore, the first driver 142 can act not only on the first coupling element 136 on the shaft door leaf 137, but also on the third coupling element 141 on the car door leaf 116, and thus can not only displace the shaft door leaf 137 but also the car door leaf 116 in the opening direction 32. Similarly, the second drive member 148 can act not only on the second connecting element 138 on the shaft door leaf 137, but also simultaneously on the fourth connecting element 143 on the car door leaf 116, so that not only the shaft door leaf 137 but also the car door leaf 116 can be shifted in the closing direction 34.

[0051] The drive unit 124 is not Figure 1 and 2 The drive unit 24 does not have three linear motors, but has two electric motors 152 and 154, each of which has a rotating output shaft. The first electric motor 152 is connected to the first driving member 142 by a first rotating driving device 156 that acts in a linear manner. The driving device 156 can be a toothed belt, a flat belt, a V-belt, or even a roller chain. Therefore, the first driving member 142 can be displaced in the opening direction 32 and the closing direction 34 along the second guide member 158 by the first electric motor 152. The second electric motor 154 is connected to the second driving member 148 by a second rotating driving device that acts in a linear manner. The second driving device is connected to the second driving member 148 by a second rotating driving device that acts in a linear manner. Figure 3 The second drive member 156 is located behind the first drive device 156 and is therefore not visible. Therefore, the second entraining member 148 can be displaced in the opening direction 32 and the closing direction 34 along the second guide member 158 by the second electric motor 154. Therefore, the two entraining members 142 and 148 can be displaced in the opening direction 32 and the closing direction 34 independently of each other.

[0052] exist Figure 4 2 shows a mechanically operated first lock for a shaft door leaf of a shaft door. The first lock 260 is arranged at Figure 4 The shaft door leaf is not shown in the figure and has a first latch 264 that can be pivoted about a first pivot axis 262 and can engage in a first recess 266 in a frame 268 of the shaft door. Figure 4In the position shown, the first locking bar engages in the first recess 266 and the shaft door leaf cannot be displaced in the opening direction 32 , whereby the shaft door leaf is locked.

[0053] The first latch 264 is connected to the rod 272 via a vertically oriented first link 270. The rod 272 is arranged to be pivotable about a second pivot axis 274 and has a first coupling element 236 on its end facing away from the first link 270, which is similar to Figure 1 , Figure 2 and Figure 3 The first coupling element 236 is designed to be arranged in a manner similar to the first coupling element 36, 136 of the embodiment of the present invention. The first coupling element 236 is arranged above the second pivot axis 274, so that when the first driver 242 is displaced in the opening direction 32, the rod 272 together with the first coupling element 236 is first slightly tilted downwards and then displaced in the opening direction 32. Therefore, the first coupling element 236 is initially displaced downwards in the first unlocking direction. This displacement causes the first connecting rod 270 to be displaced upwards, so that the first latch 264 is pivoted about the first pivot axis 262. As a result, the first latch 264 is pivoted out of the first recess 266 and the first lock 260 is unlocked. As a result, the shaft door leaf can be displaced in the opening direction 32.

[0054] Once the first driver 242 no longer exerts a force on the first coupling element 236, the rod 272 will rotate back to the original position again due to its weight distribution. Figure 4 . It is then possible that the shaft door leaf is closed again and the first locking bar 264 can engage again in the first recess 266. The weight distribution of the first locking bar 264 also additionally assists the lowering process.

[0055] exist Figure 5 The second lock 360 is arranged at Figure 5 The second latch 364 is pivotable about a third pivot axis 362 and is engageable in a second recess 366 in a frame 368 of the car door. Figure 5 In the position shown in , the second latch engages in the second recess 366 and the car door leaf cannot be displaced in the opening direction 32, whereby the car door leaf is locked.

[0056] In order to be able to operate the second lock 360, the first driving member 342 is designed in two parts. An elongated abutment element 376 is connected to the base element 380 via two pivot rods 378. Due to its own weight, the abutment element 376 can occupy a position at a maximum distance from the base element 380 without applying any force. The base element 380 can be moved by Figure 5The drive unit not shown in the figure is displaced along the opening direction 32 and the closing direction 34. Once the abutting element 376 abuts against the first or third coupling element 336, 341 by the corresponding displacement of the base element 380 along the opening direction 32, the abutting element is pivoted in the direction of the base element 380 under the guidance of the aforementioned pivot rod 378. In this process, the abutting element is mainly displaced vertically upward and perpendicular to the opening direction 32, and then displaced along the second unlocking direction. The displacement in the second unlocking direction is transmitted to the second latch 364 through the second connecting rod 370. This causes the second latch 364 to pivot around the third pivot 362. Therefore, the second latch 364 pivots out of the second recess 366, and the second lock 360 is unlocked. As a result, the car door leaf can be displaced along the opening direction 32.

[0057] Once the abutment element 376 is no longer pressed against the first or third coupling element 336, 341 by the base element 380, the abutment element 376 returns to its original position due to its weight. Figure 5 . This is possible when the car door leaf is closed again and the second latch 364 can engage again in the second recess 366. The weight distribution of the second latch 364 also additionally helps the sinking process.

[0058] Finally, it should be pointed out that the terms "having", "comprising" and the like do not exclude other elements or steps, and the terms "a" or "an" and the like do not exclude a plurality. Furthermore, it should be noted that features or steps described with reference to one of the above embodiments may also be used in combination with other features or steps of other embodiments described above within the scope of the claims. Reference numerals in the claims should not be considered as limiting.

Claims

1. A door drive device for opening and closing corresponding elevator door leaves (16, 116; 37, 137) of an elevator door (17, 39) of an elevator, the elevator door leaves being in the form of a car door leaf (16, 116) of a car door (16) and a corresponding shaft door leaf (37, 137) of a shaft door (39), the door drive device comprising: a first driving member (42, 142, 242, 342) acting on a first coupling element (36, 136, 236, 336) arranged on a first elevator door leaf (37, 137) to open the first elevator door leaf (37, 137) of a first elevator door (39), and a second driving member (48, 148), the second driving member acting on a second connecting element (38, 138) arranged on the first elevator door leaf (37, 137) to close the first elevator door leaf (37, 137) of the first elevator door (39), The first driving member (42, 142, 242, 342) and the second driving member (48, 148) can be displaced in an opening direction (32) and a closing direction (34) of the first elevator door (39) by means of a drive unit (24, 124). It is characterized in that The drive unit (24, 124) has a first drive (44, 152) for displacing a first entrainment member (42, 142) and a second drive (50, 154) for displacing a second entrainment member (48, 148), and the first entrainment member (42, 142, 242, 342) and the second entrainment member (48, 148) can be displaced in an opening direction (32) and a closing direction (34) independently of each other by means of the drive unit (24, 124).

2. The door drive device according to claim 1, It is characterized in that A first coupling element (236) arranged on a first elevator door leaf of a first elevator door is displaceable in a first unlocking direction different from the opening direction (32) and the closing direction (34) when displaced in the opening direction (32), and the first coupling element is mechanically coupled to a first lock (260) of the first elevator door, so that the first lock (260) is unlocked via the displacement of the first coupling element (236) in the first unlocking direction.

3. The door drive device according to claim 1 or 2, It is characterized in that The first driving member (142) acts on a third connecting element (141) arranged on the second elevator door to open a second elevator door leaf (116) of the second elevator door corresponding to the first elevator door leaf (137); and The second driving member (148) acts on a fourth connecting element (143) arranged on the second elevator door to close the second elevator door leaf (116) of the second elevator door.

4. The door drive device according to claim 1 or 2, It is characterized in that A second elevator door leaf (16) of the second elevator door (17) corresponding to the first elevator door leaf (37) is permanently coupled to the drive unit (24) and can therefore be displaced directly by the drive unit (24) in an opening direction (32) and a closing direction (34).

5. The door drive device according to claim 4, It is characterized in that The drive unit (24) has a third drive (30) for displacing the second door leaf (16) of the second elevator door (17).

6. The door drive according to any one of claims 1 to 5, It is characterized in that At least two of the drives (30, 44, 50) of the drive unit (24) are designed as linear motors having a common stator (26) and respectively having rotors (28, 40, 46), wherein the rotors (28, 40, 46) can be displaced independently of one another along the common stator (26).

7. The door drive according to any one of claims 3 to 6, It is characterized in that The first driving member (342) can be displaced in a second unlocking direction different from the opening direction (32) and the closing direction (34) by contacting the first connecting element (336) or the third connecting element (341), and the first driving member is mechanically connected to the second lock (360) of the second elevator door, so that the second lock (360) is unlocked via the displacement of the first driving member (342) in the second unlocking direction.

8. The door drive according to any one of claims 1 to 7, It is characterized in that The first elevator door (39) is designed as a shaft door, and the second elevator door (17) is designed as a car door.

Images