Door drive device with two independently displacable drivers

Abstract

The invention relates to a door drive device for opening and closing corresponding lift door leaves of lift doors of a lift. The door drive device according to the invention has a first driver (42), which acts on a first coupling element (36) arranged on a first lift door leaf to open the first lift door leaf of a first lift door, and a second driver (48), which acts on a second coupling arrangement (38) arranged on a first lift door leaf to close the first lift door leaf of the first lift door. The first driver (42) and the second driver (48) can be displaced by means of a drive unit (24) in an opening direction (32) and a closing direction (34) of the first lift door. 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 the opening direction (32) and in the closing direction (34) by means of the drive unit (24).

Description

[0001] DOOR DRIVE DEVICE WITH TWO INDEPENDENT, MOVEABLE CARRIERS

[0002] The invention relates to a door drive device for opening and closing corresponding elevator door leaves of elevator doors of an elevator according to the preamble of claim 1.

[0003] EP 0 332 841 B1 describes a door drive device for opening and closing corresponding elevator door leaves of elevator doors of an elevator. 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 device has a first driver, which acts on a first coupling element arranged on the shaft door leaf to open a 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 an opening direction and a closing direction of the elevator door by means of a drive unit.The two carriers, in the form of carrier skids, are part of a coupling mechanism and their distance from each other is adjustable by a parallelogram guide with two adjustment elements that can each pivot about a pivot axis. The two carrier skids can thus assume a non-spread position and a spread position. In the non-spread position, the two carrier skids can be guided between two coupling elements of a shaft door leaf, allowing the elevator car to travel past a floor and thus past a shaft door.When an elevator car is correctly positioned at a floor level, the two driver runners are positioned between the two coupling elements arranged side by side on the shaft door leaf and can be moved laterally toward them (spread apart) to, on the one hand, unlock the shaft door leaf and, on the other hand, to transmit the opening and closing movement of the car door leaf to the shaft door leaf synchronously and without play. The two driver runners are thus moved from their non-spread position to their spread position. The distance adjustment between the two driver runners is achieved by a door drive unit attached to a car door frame via a linear drive mechanism (e.g., a belt drive), which also drives the opening and closing movements of the car door leaf.

[0004] To ensure that the described passage past a landing door, as well as the coupling with a landing door leaf and the subsequent opening of the landing door, function smoothly, the coupling elements on the landing door leaves of the various floors must be aligned very precisely and, in particular, symmetrically with respect to the drive runners. In particular, the distance of all coupling elements in the opening or closing direction to the drive runners in their non-spread position must be within a precisely specified range of, for example, + / - mm. This alignment, which must be performed manually by a technician during elevator installation or maintenance, can be very time-consuming, especially in buildings with many floors.

[0005] In contrast, the object of the invention is, in particular, to propose a door drive device that does not require time-consuming adjustment work and thus enables quick and cost-effective installation and maintenance of an elevator system with the door drive device according to the invention. According to the invention, this object is achieved with a door drive device having the features of claim 1.

[0006] The door drive device according to the invention for opening and closing corresponding elevator door leaves of elevator doors of an elevator, in the form of a car door leaf of a car door and a corresponding shaft door leaf of a shaft door, has a first driver, which acts on a first coupling element arranged on the first elevator door leaf to open a first elevator door leaf of a 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 are displaceable by means of a drive unit in an opening direction and a closing direction of the first elevator door.According to the invention, the drive unit has a first drive for displacing the first driver and a second drive for displacing the second driver. The first driver and the second driver can be displaced independently of one another in the opening and closing directions by means of the drive unit. The ability to displace the two drivers independently of one another enables, in particular, the door drive device to reliably open the first elevator door leaf even when, with the elevator doors closed, 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. This eliminates the need for such precise and time-consuming adjustments 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 a theoretical position by up to 2 to 4 cm in the opening or closing direction. More generally, the door drive device with the two independently movable drivers is more flexible and robust than a door drive device with interconnected drivers. A further advantage of the door drive device according to the invention is that not all shaft doors on the floors served by the elevator need to be of the same design. The independent displacement of the two drivers allows for the opening and closing of differently designed shaft doors.

[0007] Elevator doors can have door leaves that open in only one direction, so-called side-opening single-leaf doors, or door leaves that open outward from the center. Elevator doors that open from the center, in particular, require two door drive devices. The following assumes elevator doors with door leaves that open in only one direction, i.e., the opening direction. The described door drive devices can be transferred to elevator doors that open from the center with minor adjustments that will be obvious to those skilled in the art.

[0008] Corresponding elevator door leaves or corresponding elevator doors are understood here to mean elevator door leaves or elevator doors that are opened and closed together when the elevator car stops on a floor. The corresponding elevator door leaves and the corresponding elevator doors are arranged one behind the other in a horizontal direction when the elevator car stops on a floor. The first and second drivers have, in particular, an elongated, narrow basic shape and are designed, for example, as elongated rods. They are aligned, in particular, parallel to the direction of travel of the elevator car and thus perpendicular to the, in particular, horizontal opening and closing direction of the elevator doors. The elongated shape enables the already known function of starting to open the elevator doors before the elevator car has reached its final position on a floor.

[0009] The first and second coupling elements, as well as any additional coupling elements that are optionally available, are designed as rollers. The rollers are arranged so that they can rotate freely around a rotation axis oriented perpendicular to the corresponding car door leaf. This allows the carrier to roll on the roller-shaped coupling element without significant resistance when the elevator door opens prematurely as described.

[0010] The action of a driver of the door drive device on a coupling element arranged on an elevator door leaf is understood here to mean that the driver exerts a force on the corresponding coupling element and displaces the coupling element in the opening or closing direction. In addition, the coupling element can also perform a movement in a direction deviating from the opening and closing directions, which serves, for example, to unlock the locking mechanism of an elevator door.

[0011] As described above, the first driver and the second driver can be moved independently of one another in the opening and closing directions, i.e. in particular horizontally. This means that the two drivers are not mechanically coupled to one another, thus enabling the independent movement described. The first driver and the second driver can therefore each be moved individually in the opening and closing directions. The two drivers are in particular moved along a common line. This does result in certain restrictions regarding the movement of the two drivers relative to one another, but this has no influence on the aforementioned independent movement. In this case, the two drivers can be moved towards one another until they abut or lie against one another.In an embodiment of the invention, the first coupling element arranged on the first elevator door leaf of the first elevator door can be displaced in a first unlocking direction that deviates from the opening direction and the closing direction upon displacement in the opening direction. The first coupling element is mechanically coupled to a first lock of the first elevator door such that the first lock is unlocked via the aforementioned displacement of the first coupling element in the first unlocking direction. Thus, the first elevator door can advantageously be unlocked through the interaction of the first driver and the first coupling element, and no separate actuator is required for unlocking the first elevator door.

[0012] In its locked position, said first locking mechanism fixes the first elevator door leaf, on which the first follower is arranged, for example, relative to a frame of the corresponding first elevator door. When the first locking mechanism is unlocked, i.e., moved to its unlocked position, the elevator door leaf can be displaced relative to said frame, thus opening the elevator door.

[0013] The first coupling element can in particular only be displaced in the first unlocking direction when the first elevator door is completely closed and thus the first coupling element is in a corresponding closed position.

[0014] The first coupling element can, for example, be arranged on a lever which is rotatable about a rotational axis running perpendicular to the opening direction and perpendicular to the first unlocking direction. The lever is designed such that, without interaction with the first driver, due to its weight distribution, it assumes a position in which the first locking mechanism, coupled to the lever via a rod, is locked. When the first driver 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 running perpendicular thereto. This leads to a rotation of said lever about the rotational axis and a transmission of the movement of the first coupling element via said rod to the first locking mechanism, which is thus unlocked.It is also possible for the first locking mechanism of the elevator shaft door to be operated independently of the coupling elements, for example with an actuator or an electromagnet, and thus locked and unlocked.

[0015] In an embodiment of the invention, the first driver acts on a third coupling element arranged on the second elevator door to open a second elevator door leaf of a 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 to close the second elevator door leaf of the second elevator door. In other words, not only the first elevator door but also the second elevator door is opened and closed by means of the two drivers. This eliminates the need for a separate drive for moving the second elevator door leaf of the second elevator door.

[0016] The third and fourth coupling elements are designed, in particular, analogously to the first and second coupling elements. The drive unit has, in particular, a first drive for displacing the first driver and a second drive for displacing the second driver. The third and fourth coupling elements can be arranged directly on the second elevator door leaf. They can also be arranged on a component of the second elevator door that is permanently connected to the second elevator door leaf. Such a component can, for example, be a so-called hanging carriage on which the second elevator door leaf is suspended.

[0017] In one embodiment of the invention, a second elevator door leaf of a second elevator door, corresponding to the first elevator door leaf, is permanently coupled to the drive unit and can thus be moved directly by the drive unit in the opening and closing directions. This eliminates the need for coupling elements on the second elevator door leaf of the second elevator door.

[0018] A permanent coupling of the second elevator door leaf to the drive unit is understood here to mean that a drive connection that cannot be interrupted during normal operation of the elevator exists, for example, via a connection to a rotor of a linear motor of the drive unit or via 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.

[0019] The drive unit has, in particular, a first drive for moving the first carrier, a second drive for moving the second carrier, and a third drive for moving the second door leaf of the second elevator door. This allows for particularly flexible movement of the two carriers and the second elevator door leaf.

[0020] In one embodiment of the invention, at least two of the drives of the drive unit are designed as linear motors. The linear motors each have a common stator and a rotor. These rotors can be moved independently of one another along the common stator. This advantageously requires only one stator for the two or three linear motors.

[0021] It is also possible for the drive unit to have electric motors with a rotating output shaft. The individual electric motors are then each coupled to the carriers and, if applicable, the second elevator door leaf of the second elevator door via a chain or belt.

[0022] In one embodiment of the invention, the first driver can be displaced in a second unlocking direction, which deviates from the opening and closing directions, via contact with the first coupling element or the third coupling element. The first driver is also mechanically coupled to a second lock of the second elevator door such that the second lock is unlocked via the aforementioned displacement of the first driver in the second unlocking direction. Thus, the second elevator door can advantageously be unlocked through the interaction of the first driver and the first or third coupling element, and no separate actuator is required for unlocking the second elevator door.

[0023] Analogous to the aforementioned first lock, the second lock fixes the second elevator door leaf of the second elevator door in its locked position, for example, relative to a frame of the corresponding elevator door. When the second lock is unlocked, i.e., moved to its unlocked position, the elevator door leaf can be moved relative to the aforementioned frame, thus opening the elevator door.

[0024] In particular, the first driver can only be moved in the second unlocking direction if the second elevator door is completely closed and the first driver is thus in a corresponding closed position.

[0025] A displacement of the first driver in the second displacement direction should be understood here to mean that at least part of the first driver is displaced in the second displacement direction. The first driver can, for example, be designed in two parts. An elongated contact element is connected to a base element, for example, via two pivoting levers. Due to its own weight, the contact element assumes a position at a maximum distance from the base element without the application of force. The base element can be displaced by the drive unit in the opening and closing directions. As soon as the contact element rests against the first or third coupling element as a result of a corresponding displacement of the base element in the opening direction, it is pivoted towards the base element, guided by the aforementioned pivoting levers. In doing so, it is displaced, among other things, perpendicular to the opening direction and thus in the second unlocking direction.This displacement in the second unlocking direction is transmitted via a rod to the second lock, which is then unlocked.

[0026] It is also possible for the first locking mechanism of the elevator shaft door to be operated independently of the coupling elements, for example with an actuator or an electromagnet, and thus locked and unlocked.

[0027] In one embodiment of the invention, the first elevator door is designed as a shaft door and the second elevator door as a car door. The door drive device is thus arranged on the elevator car, in particular on the frame of the car door, and is moved between floors together with the elevator car. Only one door drive device is therefore necessary, since it can be moved with the elevator car to the various shaft doors, which can thus be opened and closed. However, it is also possible for the first elevator door to be designed as a car door and the second elevator door as a shaft door. In this case, the door drive device is arranged on a shaft door, in particular on the frame of a shaft door.

[0028] Further advantages, features, and details of the invention will become apparent from the following description of exemplary embodiments and from the drawings, in which identical or functionally equivalent elements are provided with identical reference numerals. The drawings are merely schematic and not to scale.

[0029] Showing:

[0030] Fig. 1 shows a car door of a lift car of a lift with a door drive device, wherein a car door leaf of the car door is closed,

[0031] Fig. 2 the cabin door from Fig. 1 with partially opened cabin door leaf,

[0032] Fig. 3 shows a second embodiment of a car door of an elevator car of an elevator with a door drive device,

[0033] Fig. 4 a mechanically operated first locking device for a shaft door leaf of a shaft door and

[0034] Fig. 5 a mechanically operated second locking device for a cabin door leaf of a cabin door.

[0035] Fig. 1 and 2 schematically show a door drive device 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 device 12 is arranged on a door support 18 fastened to the elevator car 10. The car door leaf 16 is fastened to a suspension carriage 20, which is horizontally displaceable along a guide rail 22 fixed to the door support 18 and can be moved by a drive unit 24 between a door leaf closed position and a door leaf open position.

[0036] The drive unit 24 has an elongated, parallel to the guide rail

[0037] 22. The stator 26, together with a first runner 28, forms a first linear motor 30. The first runner 28 can be displaced along the stator 26 by appropriate control of a control unit (not shown). The first runner 28 is fixedly and thus permanently connected to the suspended carriage 20 and thus coupled to the suspended carriage 20, so that the suspended carriage 20 and thus the cabin door leaf 16 can be displaced directly by the first linear motor 30 and thus by the drive unit 24 for opening in an opening direction 32 and for closing in a closing direction 34. The opening direction 32 and the closing direction 34 run horizontally and parallel to the guide rail 22 and the stator 26.

[0038] The door drive device 12 serves not only to open and close the car door leaf 16, but also to open and close a shaft door leaf 37 of a shaft door 39, corresponding to the car door leaf 16, having a first coupling element 36 and a second coupling element 38. The shaft door 39 is represented by the shaft door leaf 37 shown in dashed lines and the two coupling elements 36, 38. The two coupling elements 36 and 38 are designed as rollers and arranged such that they can rotate freely about a rotation axis oriented perpendicular to the shaft door leaf 37. The shaft door 39 can be referred to as a first elevator door, and the shaft door leaf 37 as a first elevator door leaf. The car door 17 can be referred to as a second elevator door, and the car door leaf 16 as a second elevator door.

[0039] The drive unit 24 has a second rotor 40 on which an elongated first driver 42 is arranged. The second rotor 40, like the first rotor 28, can be moved along the stator 26 with appropriate control 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, like the first rotor 28 and the second rotor 40, can be moved along the stator 26 and, together with the stator 26, forms a third linear motor 50. The three linear motors 30, 44, and 50 thus have a common stator 26. The second rotor 40 and the third rotor 46, and thus the first driver 42 and the second driver 48, can be moved along the stator 26 independently of one another.The first driver 42 and the second driver 48 are aligned parallel to a displacement direction 51 of the elevator car 10 and thus perpendicular to the horizontal opening direction 32 and closing direction 34. The elongated shape makes it possible to begin opening the shaft door leaf 37 before the elevator car 10 has reached its final position at a floor.

[0040] In Fig. 1, the car door leaf 16 and the corresponding shaft door leaf 37 are completely closed. The two drivers 42 and 48 are positioned such that they can be guided between the two coupling elements 36 and 38 in the displacement direction 51 of the elevator car 10. This allows the elevator car 10 to be displaced past a floor and thus past a shaft door with a shaft door leaf without contact between the door drive device 12 and the shaft door leaf. Starting from the position of the aforementioned components shown in Fig. 1, the car door leaf 16 and the corresponding shaft door leaf 37 can be opened.

[0041] The first driver 42 and the first coupling element 36 are arranged relative to one another such that as soon as the elevator car 10 is at or shortly before its final position on a floor, the first driver 42 can act on the first coupling element 36 such that the shaft door leaf 37 can be displaced in the opening direction 32 via the first driver 42. The first driver 42 then rests on the first coupling element 36, as shown in Fig. 2, and transmits a force applied by the second linear motor 44 to the coupling element 36 in the opening direction 32. This positioning of the first driver 42 relative to the first coupling element 36 is shown in Fig. 2, in which the car door leaf 16 and the corresponding shaft door leaf 37 are partially open.

[0042] To open the shaft door leaf from the position of the individual components shown in Fig. 1, the first driver 42 is displaced in the opening direction 32 by means of the second linear motor 44 until it rests against the first coupling element 36. Upon further displacement 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. This opens the shaft door leaf 37. 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.

[0043] Before the shaft door leaf 37 and the car door leaf 16 are opened, a first lock of the shaft door leaf (not shown in Figs. 1 and 2) and a second lock of the car door leaf 16 (likewise not shown) are opened by means of an actuator.

[0044] In order to close the shaft door leaf 16 again, a force in the closing direction 34 is exerted on the second driver 38 via the second driver 48, which can be moved by the third linear motor 50. The second driver 48 thus acts in the closing direction 34 on the second driver 38 and thus on the shaft door leaf 37, moving it back into the closed position shown in Fig. 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 have closed, the two drivers 42 and 48 are moved towards each other so that they also assume the position shown in Fig. 1, in which they can be guided between the two coupling elements 36 and 38. Finally, the first lock of the shaft door leaf 37 and the second lock of the car door leaf 16 are locked.

[0045] The door drive device 112 shown in Fig. 3 is constructed very similarly to the door drive device 12 in Fig. 1 and Fig. 2, which is why only the differences between the two door drive devices will be discussed.

[0046] In the door drive device 112 according to Fig. 3, the car door leaf 116 is not permanently coupled to a drive unit 124. Instead, a third coupling element 141 and a fourth coupling element 143 are arranged on a suspension carriage 120 and thus on a component of the car door 117 that is permanently connected to the car door leaf 116. The third coupling element 141 is designed and arranged analogously to the first coupling element 136 on the shaft door leaf 137, and the fourth coupling element 143 is designed and arranged analogously to the second coupling element 138 on the shaft door leaf 137. A first driver 142 can thus act not only on the first coupling element 136 on the shaft door leaf 137 but simultaneously also on the third coupling element 141 on the car door leaf 116 and thus displace not only the shaft door leaf 137 but simultaneously also the car door leaf 116 in the opening direction 32.Analogously, a second driver 148 can thus act not only on the second coupling element 138 on the shaft door leaf 137 but simultaneously also on the fourth coupling element 143 on the car door leaf 116 and thus displace not only the shaft door leaf 137 but simultaneously also the car door leaf 116 in the closing direction 34.

[0047] The drive unit 124 does not have three linear motors like the drive unit 24 in Figs. 1 and 2, but two electric motors 152, 154, each with a rotating output shaft. The first electric motor 152 is connected to the first driver 142 via a first linearly acting, rotating drive means 156. The drive means 156 can be a toothed belt, a flat belt, a V-belt, or even a roller chain. This allows the first driver 142 to be displaced by the first electric motor 152 along a second guide 158 in the opening direction 32 and closing direction 34. The second electric motor 154 is connected to the second driver 148 via a second linearly acting, rotating drive means, which is located behind the first drive means 156 in Fig. 3 and is therefore not visible. Thus, the second driver 148 can be displaced by the second electric motor 154 along the second guide 158 in the opening direction 32 and closing direction 34.The two drivers 142 and 148 can thus be moved independently of each other in the opening direction 32 and in the closing direction 34.

[0048] Fig. 4 shows a mechanically operated first locking mechanism for a shaft door leaf of a shaft door. The first locking mechanism 260 is arranged on a shaft door leaf (not shown in Fig. 4) and has a first bolt 264 pivotable about a first pivot axis 262, which can engage in a first recess 266 in a frame 268 of the shaft door. In the position of the first bolt 264 shown in Fig. 4, in which it engages in the first recess 266, the shaft door leaf cannot be displaced in the opening direction 32, whereby the shaft door leaf is locked.

[0049] The first bar 264 is connected via a first, vertically aligned rod 270 to a

[0050] Lever 272 is connected. The lever 272 is pivotable about a second pivot axis 274 and has, at its end facing away from the first rod 270, a first coupling element 236, which is designed analogously to the first coupling elements 36, 136 of Fig. 1, 2 and 3. 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 lever 272, together with the first coupling element 236, is initially tilted slightly downward and only then displaced in the opening direction 32. The first coupling element 236 is thus initially displaced downward in a first unlocking direction. This displacement leads to an upward displacement of the first rod 270 and thus to a pivoting of the first latch 264 about the first pivot axis 262. The first latch 264 thus pivots out of the first recess 266 and the first lock 260 is unlocked.This allows the shaft door leaf to be moved in the opening direction 32.

[0051] As soon as the first driver 242 no longer exerts force on the first coupling element 236, the lever 272, due to its weight distribution, tends to rotate back into the position shown in Fig. 4. This is possible when the shaft door leaf is closed again and the first bolt 264 can again engage the first recess 266. The insertion is additionally supported by the weight distribution of the first bolt 264.

[0052] Fig. 5 shows a mechanically operated second locking mechanism for a car door leaf of a car door. The second locking mechanism 360 is arranged on a car door leaf (not shown in Fig. 5) and has a second latch 364 pivotable about a third pivot axis 362, which can engage in a second recess 366 in a frame 368 of the car door. In the position of the second latch 364 shown in Fig. 5, in which it engages in the second recess 366, the car door leaf cannot be displaced in the opening direction 32, whereby the car door leaf is locked.

[0053] To enable actuation of the second locking mechanism 360, the first driver 342 is constructed in two parts. An elongated contact element 376 is connected to a base element 380 via two pivot levers 378. Due to its own weight, the contact element 376 assumes a position at a maximum distance from the base element 380 without the application of force. The base element 380 can be displaced in the opening direction 32 and closing direction 34 by the drive unit (not shown in Fig. 5). As soon as the contact element 376 rests against the first or third coupling element 336, 341 due to a corresponding displacement of the base element 380 in the opening direction 32, it is pivoted toward the base element 380, guided by the aforementioned pivot levers 378. In doing so, it is displaced, among other things, vertically upwards and perpendicular to the opening direction 32 and thus in a second unlocking direction.This displacement in the second unlocking direction is transmitted to the second latch 364 via a second rod 370. This causes the second latch 364 to pivot about the third pivot axis 362. The second latch 364 thus pivots out of the second recess 366, and the second lock 360 is unlocked. This allows the cabin door leaf to be displaced in the opening direction 32.

[0054] As soon as the contact element 376 is no longer pressed against the first or third coupling element 336, 341 via the base element 380, the contact element 376, due to its weight, tends to return to the position shown in Fig. 5. This is possible when the car door leaf is closed again and the second latch 364 can again engage in the second recess 366. The insertion is additionally supported by the weight distribution of the second latch 364.

[0055] Finally, it should be noted that terms such as "having," "comprising," etc., do not exclude other elements or steps, and terms such as "a" or "an" 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 signs in the claims are not to be considered as limitations.

Claims

Patent claims 1. Door drive device for opening and closing corresponding elevator door leaves (16, 116; 37, 137) of elevator doors (17, 39) of an elevator 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), with - a first driver (42, 142, 242, 342) which acts on a first coupling element (36, 136, 236, 336) arranged on the first elevator door leaf (37, 137) to open a first elevator door leaf (37, 137) of a first elevator door (39) and - a second driver (48, 148) which, for closing the first elevator door leaf (37, 137) of the first elevator door (39), acts on a second coupling element (38, 138) arranged on the first elevator door leaf (37, 137), wherein the first driver (42, 142, 242, 342) and the second driver (48, 148) are displaceable by means of a drive unit (24, 124) in an opening direction (32) and a closing direction (34) of the first elevator door (39), characterized in that the drive unit (24, 124) has a first drive (44, 152) for displacing the first driver (42, 142) and a second drive (50, 154) for displacing the second driver (48, 148), and the first driver (42, 142, 242, 342) and the second driver (48, 148) can be displaced independently of one another in the opening direction (32) and in the closing direction (34) by means of the drive unit (24, 124).

2. Door drive device according to claim 1, characterized in that the first coupling element (236) arranged on the first elevator door leaf of the first elevator door can be displaced in a first unlocking direction deviating from the opening direction (32) and the closing direction (34) when displaced in the opening direction (32) and is mechanically coupled to a first lock (260) of the first elevator door such that the first lock (260) is unlocked via the said displacement of the first coupling element (236) in the first unlocking direction.

3. Door drive device according to claim 1 or 2, characterized in that - the first driver (142) acts on a third coupling element (141) arranged on the second elevator door to open a second elevator door leaf (116) of a second elevator door corresponding to the first elevator door leaf (137), and - the second driver (148) acts on a fourth coupling element (143) arranged on the second elevator door to close the second elevator door leaf (116) of the second elevator door.

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

5. Door drive device according to claim 4, 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. Door drive device according to one of claims 1 to 5, characterized in that at least two of the drives (30, 44, 50) of the drive unit (24) are designed as linear motors which have a common stator (26) and each have a rotor (28, 40, 46), wherein said rotors (28, 40, 46) are displaceable independently of one another along the common stator (26).

7. Door drive device according to one of claims 3 to 6, characterized in that the first driver (342) is displaceable via a contact with the first coupling element (336) or the third coupling element (341) in a second unlocking direction deviating from the opening direction (32) and the closing direction (34) and so is mechanically coupled to a second lock (360) of the second elevator door, such that the second lock (360) is unlocked via said displacement of the first driver (342) in the second unlocking direction.

8. Door drive device according to one of claims 1 to 7, 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.

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