Car assembly for a double-deck elevator, and double-deck elevator

Abstract

The invention relates to a car assembly (20) for a double-deck elevator (10). The car assembly (20) comprises: a car frame (22); a first cabin (24) arranged in the car frame (22); a second cabin (26) arranged in the car frame (22) above or below the first cabin (24), wherein at least one of the cabins (24, 26) is mechanically coupled to the car frame (22) in such a way that it is movable in the vertical direction relative to the car frame (22) and relative to the other cabin (24, 26), and wherein the car frame (22) comprises at least one support beam (28) which extends beneath the movable cabin (24, 26) and supports the corresponding cabin (24, 26); and a spindle drive (30) for vertically displacing the movable cabin (24, 26), wherein the spindle drive (30) comprises a vertically extending spindle (34) and a motor (32) for rotating the spindle (34), wherein, when the car assembly (20) is arranged as intended, the spindle (34) is mechanically coupled, on the one hand, to an underside (38) of the movable cabin (24, 26) and, on the other hand, to the motor (32), and wherein the spindle (34) is arranged in the vertical direction between the support beam (28) and the movable cabin (24, 26) such that it bears at least part of the weight of the movable cabin (24, 26) and transmits it to the support beam (28).

Description

[0001] Car arrangement for a double-decker elevator and double-decker elevator

[0002] The present invention relates to a car arrangement for a double-decker elevator and a double-decker elevator with such a car arrangement.

[0003] People or goods can be transported between different floors or levels in buildings using ordinary single-car elevators or double-decker elevators, sometimes also called double-decker elevators. A double-decker elevator is characterized by a car assembly with a car frame and two cars arranged one above the other. The two cars allow two different floors to be accessed simultaneously.

[0004] In some buildings, the floors are of different heights, resulting in varying vertical distances between elevator entrances. To ensure that such floors can be accessed smoothly by a double-decker elevator, it must be possible to adjust the vertical distance between the two cabins to the respective floor heights and entrance distances. To adjust this vertical distance, at least one of the two cabins must be movable vertically relative to the other cabin and relative to the elevator car frame. This vertical movement is achieved by means of a

[0005] Relocation device.

[0006] The relocation device can, for example, include one or more screw spindle drives and / or scissor-like connecting elements by which the two cabins are connected. Such a screw drive has at least one spindle and a rack into which the spindle engages. The spindle can be located on the car frame of the car assembly or on the cabin to be moved. The rack can accordingly be located on the cabin to be moved or on the car frame. When the spindle rotates, as generated by a drive unit, the distance between the cabins changes. Alternatively, a hydraulic relocation device can be provided for moving the cabin. The distance between the cabins can be adjusted during travel by means of a control system to the floor-to-floor distance between the two floors being served and the corresponding distance between the entrances.

[0007] US 7,017,714 B2 describes a double-decker elevator in which both cabins can be moved vertically relative to a car frame by means of corresponding spindle drives, the spindles of the spindle drives being arranged horizontally next to the respective cabins in an elevator shaft of the elevator system. While this allows the cabins to be moved relatively far vertically relative to the car frame, it requires additional space next to the cabins, necessitating either a correspondingly wide elevator shaft or a correspondingly narrow cabin design.

[0008] US 6 161 652 A, JP 2001 322771 A, JP Hl 1 335040 A, JP 2004 307158 A and JP 2017 190220 A also describe double-decker elevators in which at least one of two cabins can be moved vertically relative to a car frame.

[0009] When designing an elevator system, the size of the elevator shaft, particularly its cross-sectional area (footprint), plays a crucial role. Furthermore, it is generally advantageous to design the cabins to be as large as possible to transport as many people and / or goods as possible simultaneously. To avoid having to enlarge the elevator shaft and / or reduce the size of the cabins, the transfer mechanism should have the smallest possible footprint, especially horizontally. However, the aforementioned transfer mechanism requires a relatively large amount of space, both horizontally and vertically, and the available horizontal space in an elevator shaft is typically very limited.

[0010] There may therefore be a need for a car arrangement for a double-decker elevator that makes it possible to adjust the distance between an upper cabin and a lower cabin of the car arrangement, and that contributes to making the elevator shaft of the double-decker elevator particularly small in the horizontal direction and / or to making the cabins particularly large in the horizontal direction, and additionally allows the weight force of the moving cabin to be taken into account.

[0011] Such a need can be met by the object according to one of the independent claims. Advantageous embodiments are defined in the dependent claims and the following description.

[0012] A first aspect of the invention relates to a car assembly for a double-decker elevator. The car assembly comprises a car frame; a first car arranged in the car frame; a second car arranged in the car frame above or below the first car, wherein at least one of the cars is mechanically coupled to the car frame in such a way that it is movable in a vertical direction relative to the car frame and relative to the other car, and wherein the car frame has at least one support extending below the movable car and supporting the corresponding car; a spindle drive for vertically moving the movable car; and at least one load sensor for detecting the weight of the movable car. The spindle drive comprises a vertically extending spindle and a motor for rotating the spindle.With the car assembly arranged as intended, the spindle is mechanically coupled to an underside of the moving car on one side and to the motor on the other. The spindle is positioned vertically between the support and the moving car in such a way that it absorbs at least a portion of the weight of the moving car and transmits it to the support. According to the invention, the load sensor is positioned vertically between the support and the spindle drive in such a way that the load sensor transmits to the support the portion of the weight of the moving car that is absorbed by the spindle drive, or the load sensor is positioned vertically between the spindle drive and the moving car in such a way that the load sensor transmits to the spindle drive the portion of the weight of the moving car that is absorbed by the spindle drive.

[0013] The load meter thus serves to detect the weight force of the movable cabin and to transfer part of the weight force from the spindle drive to the support or to transfer part of the weight force from the movable cabin to the spindle drive.

[0014] If the load sensor is arranged vertically between the support and the spindle drive such that it transmits the portion of the movable cabin's weight, absorbed by the spindle drive, to the support, then the spindle drive is supported on the support, particularly via the load sensor from above. The spindle drive thus rests on the load sensor and is therefore located entirely above it. Consequently, the spindle drive is in direct contact with the load sensor, and the load sensor is in direct contact with the support.

[0015] If the load sensor is arranged vertically between the spindle drive and the movable cabin such that it transmits the portion of the cabin's weight that is absorbed by the spindle drive to the spindle drive, then the movable cabin is supported on the spindle of the spindle drive, particularly via the load sensor. The movable cabin is thus in direct contact with the load sensor, and the load sensor is in direct contact with the spindle of the spindle drive. The spindle drive is therefore located entirely below the load sensor.

[0016] The spindle drive serves to move the cabin, which is movable relative to the car frame, vertically relative to the other cabin, so that the vertical distance between the cabins can be adjusted, particularly depending on the access points to the cabins on different floors of a building in which the double-decker elevator is located. The vertical distance is adjusted primarily by rotating the spindle using the motor, thereby moving the upper side of the spindle and thus the cabin mounted on it vertically.

[0017] Due to the arrangement of the spindle drive in a vertical direction between the support and the movable cabin, and due to the mechanical coupling of the spindle with the underside of the movable cabin, space can be saved horizontally next to the movable cabin, so that the movable cabin can be particularly large in the horizontal direction and / or the elevator shaft of the double-decker elevator can be made particularly small in the horizontal direction.

[0018] Furthermore, the spindle drive can be positioned between the support structure and the movable cabin in such a way that the cabin rests stably on the spindle drive, thus eliminating the need for vertical guidance of the cabin within the car frame. For this purpose, two or more spindle drives can optionally be arranged between the support structure and the movable cabin, as described in more detail below.

[0019] The term "car frame" generally refers to a frame that moves between several levels or floors in the elevator shaft, used to hold and / or support the two car cabins. The car frame can be a frame-like structure for supporting the cabins and is also sometimes called a safety frame. The car frame can, for example, be guided along at least one guide rail running within the elevator shaft. Such guide rails can be located on one side or on two opposite sides of the elevator shaft.

[0020] The car frame holds and supports the two double-decker cabins, allowing them to travel to two different floors simultaneously. As mentioned earlier, unequal floor spacing may necessitate adjusting the vertical distance between the two cabins of the double-decker elevator. For this purpose, a spindle drive is provided, enabling at least one of the cabins to be moved vertically relative to the other cabin and to the car frame. The vertical distance between the cabins can be determined, for example, by the length of a section of the spindle extending from the motor to the underside of the respective cabin. This length can be adjusted by the motor, thereby moving the movable cabin relative to the other cabin.

[0021] Optionally, both cabins can be arranged to be displaceable vertically relative to the car frame. In this case, a corresponding support can be arranged under both cabins, with the corresponding spindle drive(s) for vertical displacement of the respective cabin located between the support and the respective cabin. If there are multiple spindle drives per car frame and / or per cabin, the spindle drives can each be designed and / or arranged according to the spindle drive described above and below.

[0022] According to one embodiment, the spindle is arranged vertically between the support and the movable cabin such that, in a top view of the intended car arrangement, at least part of the spindle is concealed by the movable cabin. This contributes to the spindle drive requiring little space horizontally next to the movable cabin.

[0023] According to one embodiment, the spindle is arranged vertically between the support and the movable cabin such that, in a top view of the intended car arrangement, the spindle is completely concealed by the movable cabin. This contributes to the spindle drive requiring a particularly small horizontal footprint next to the movable cabin.

[0024] According to one embodiment, the spindle drive is arranged vertically between the support and the movable cabin such that, in a top view of the intended car arrangement, the spindle drive is completely concealed by the movable cabin. This contributes to the spindle drive requiring a particularly small amount of space horizontally next to the movable cabin.

[0025] According to one embodiment, the car assembly has two or more spindle drives, which, in the intended configuration, are spaced apart horizontally on the support and vertically between the support and the movable car. With a suitable arrangement of the spindle drives under the movable car, this can eliminate the need for vertical guidance of the movable car within the car frame. According to another embodiment, the spindle drive(s) are arranged such that the movable car can be displaced vertically relative to the car frame without any guides. In this embodiment, the car frame lacks any vertical guide for guiding the movable car within the frame. This can contribute to a simpler, lower-maintenance, and more cost-effective car frame design.

[0026] A second aspect of the invention relates to the double-decker elevator. The double-decker elevator comprises the car arrangement described above and a control unit configured to control the spindle drive of the car arrangement, depending on the floor-to-floor distance between a first floor and a second floor, such that, in a stationary position of the car arrangement, the first car is accessible via the first floor and the second car is accessible via the second floor. Information about the floor-to-floor distances of the corresponding building and / or the corresponding access points can, for example, be stored on a memory unit of the control unit, for instance, in the form of a lookup table in which the floors and their distances are assigned to corresponding control signals for the drive unit.

[0027] Embodiments of the invention are described below with reference to the accompanying drawings, whereby neither the drawings nor the description are to be interpreted as limiting the invention.

[0028] Fig. 1 shows an exemplary embodiment of a car arrangement for a double-decker elevator.

[0029] Fig. 2 shows an exemplary embodiment of a car arrangement for a double-decker elevator.

[0030] Fig. 3 shows a top view of a cross-section through an exemplary embodiment of an elevator car assembly. The figures are schematic only and not to scale. Identical reference numerals in the different figures denote identical or equivalent features.

[0031] Fig. 1 shows an embodiment of a car assembly 20 for a double-decker elevator 10. The double-decker elevator 10 is located in a building (not shown). The car assembly 20 can be moved vertically within an elevator shaft (not shown) of the double-decker elevator 10, which is located in the building, by means of one or more support elements 18. The support element(s) 18 can be mechanically coupled to a drive unit (not shown) of the double-decker elevator 10, the drive unit being designed to move the support elements 18 and thereby move the car assembly 20 vertically in the elevator shaft. For the sake of clarity, other components of the double-decker elevator 10, such as the drive unit for moving the entire car assembly 20 vertically, one or more counterweights, landing doors, or similar components, are not illustrated in the figures.

[0032] The car assembly 20 comprises a car frame 22, a first cabin 24, a second cabin 26, and one or more spindle drives 30. Furthermore, the car assembly 20 can have one or more load meters 36 for detecting the load of one of the cabins 24, 26, for example, the second cabin 26.

[0033] The car frame 22 can generally be understood as a frame movable between several levels or floors 52, 54 of the building in the elevator shaft for holding and / or supporting the two cabins 24, 26. The car frame 22 can, in particular, be a frame-like structure for supporting the cabins 24, 26 and can also be referred to as a safety frame. The car frame 22 can, for example, be guided along at least one guide rail (not shown) running vertically in the elevator shaft. Such guide rails can be arranged on one side or on two opposite sides in the elevator shaft. The car frame 22 has a support 28 for supporting one of the cabins, for example, the second cabin 26. The support 28 runs below the movable cabin 24, 26, in particular the second cabin 26, and supports the corresponding cabin 26.Optionally, the car frame 22 can have an additional support for carrying the first cabin 24 (not shown in Figure 1).

[0034] The cabins 24 and 26 are arranged vertically one above the other in the car frame 22. For example, in the embodiment shown in Figure 1, the first cabin 24 is arranged below the second cabin 26. In another embodiment (not shown), the first cabin 24 can be arranged above the second cabin 26. In a standard arrangement of the car assembly 20, a lower side 38 of the second cabin 26 faces downwards and a top side of the second cabin 26 faces upwards, as shown in Figure 1. In the elevator shaft, the first cabin 24 can be accessed via a first access point on a first floor 52 of the building, and the second cabin 26 via a second access point on a second floor 54 of the building.Cabins 24 and 26 are used to transport one or more loads, especially persons and / or goods, within the building, for example from the first floor 52 of the building to the second floor 54 of the building, or from the second floor 54 of the building to the first floor 52 of the building.

[0035] At least one of the cabins 24, 26, for example the second cabin 26, is mechanically coupled to the car frame 22 in such a way that it can be displaced vertically relative to the car frame 22 and relative to the other cabin 24, 26, in particular the first cabin 24. In contrast, the first cabin 24 can be rigidly coupled to the car frame 22, for example by means of several brackets 40. In other words, in the embodiment shown in Figure 1, the first cabin 24 can be fixed relative to the car frame 22 by means of the brackets 40.

[0036] Optionally, both cabins 24, 26 can be arranged to be displaceable in the vertical direction relative to the car frame 22. In this case, a corresponding support 28 can be arranged under both cabins 24, 26, with the corresponding spindle drives 30 for vertical displacement of the respective cabin 24, 26 being arranged between the support 28 and the respective cabin 24, 26. In the case of multiple spindle drives 30 per car frame 22 and / or per cabin 24, 26, the spindle drives 30 can each be designed and / or arranged according to the spindle drive 30 described with reference to Figure 1.

[0037] The spindle drive 30 comprises a vertically extending spindle 34 and a motor 32 for rotating the spindle 34. The motor 32 can, for example, be an electric motor. In the intended arrangement of the car assembly 20, the spindle 32 is mechanically coupled on one side to a bottom surface 38 of the movable car, in particular the second car 26, and on the other side to the motor 32. The spindle 34 is arranged vertically between the support 28 and the second car 26 such that it absorbs at least part of the weight of the second car 26 and transmits it to the support 28. The spindle drive 30 serves to move the second car 26, which is movable relative to the car frame 22, vertically relative to the first car 24, so that a vertical distance between the cars 24 and 26 can be adjusted by means of the spindle drive 30.The spindle drive 30 can, for example, be designed such that the second cabin 26 can be moved vertically in a range of 5 cm to 30 cm, for example from 10 cm to 20 cm, by means of the spindle drive 30, for example by approximately 15 cm.

[0038] Optionally, the spindle drive 30 has a housing. The motor 32 and / or part of the spindle 34 may be arranged in or on the housing. In the embodiment shown in Figure 1, the second cabin 26 is movable relative to the car frame 22, and accordingly, the spindle drive 30 is arranged under the second cabin 26. Alternatively or additionally, the first cabin 24 may be arranged to be movable relative to the car frame 22, in which case at least one of the spindle drives 30 is arranged under the first cabin 24 or under both cabins 24 and 26.

[0039] The spindle 34 can be arranged vertically between the support 28 and the movable cabin 26 such that, in a top view of the elevator car assembly 20 arranged as intended, at least part of the spindle 34 is concealed by the movable second cabin 26, as shown by way of example in Figure 3 in another embodiment. In particular, the spindle 34 can be arranged vertically between the support 28 and the second cabin 26 such that, in a top view of the elevator car assembly 20 arranged as intended, the spindle 34 is completely concealed by the movable cabin 26. In particular, the spindle drive 30 can be arranged vertically between the support 28 and the movable cabin 26 such that, in a top view of the elevator car assembly 20 arranged as intended, the spindle drive 30 is completely concealed by the movable cabin 26.

[0040] The distance between cabins 24 and 26 can be adjusted, in particular depending on the distances between floors 52 and 54. The vertical distance between cabins 24 and 26 is adjusted, in particular, by rotating the spindle 34 using the motor 32, whereby the upper surface of the spindle 34, and thus the second cabin 26 arranged on the spindle 34, is moved vertically.

[0041] If the vertical distance between the first cabin 24 and the second cabin 26 does not match the vertical distance between the first entrance on the first floor 52 and the second entrance on the second floor 54, the second cabin 26 can be moved vertically relative to the first cabin 24 by means of the spindle drive 30. The motor 32 can drive the spindle 34 such that the length of a section of the spindle 34 located between the motor 32 and the underside 38 of the second cabin 26 changes, thereby changing the vertical position of the second cabin 26 relative to the first cabin 24. For example, the spindle 34 can be used to raise or lower the second cabin 26 relative to the car frame 22.For this purpose, the double-decker elevator 10 can have or be coupled to a control unit 50, the control unit 50 being configured to control the spindle drive 30 depending on the vertical distance between the entrances of the corresponding floors 52, 54. Control can be effected by means of corresponding control signals generated by the control unit 50 and sent to the spindle drive 30.

[0042] Optionally, the spindle drive 30 can be configured such that, when the second cabin 26 is lowered relative to the car frame 22, the motor 32 is driven by the spindle 34 and generates electrical energy. In other words, when the second cabin 26 is moved from top to bottom, the potential energy released during this process can be converted into electrical energy by means of the spindle 34 and the motor 32 in generator mode. The electrical energy can be temporarily stored in an energy storage device (not shown in the figures) and reused at a later time, for example, to raise the second cabin 26.

[0043] Optionally, the spindle drive 30 can be arranged between the support 28 and the second cabin 26 such that the second cabin 26 rests stably on the spindle drive 30, thus eliminating the need for vertical guidance of the movable second cabin 26 within the car frame 22. For this purpose, two or more spindle drives 30 can optionally be arranged between the support 28 and the movable second cabin 26, as explained in more detail below with reference to Figures 2 and 3. Alternatively, the second cabin 26 can have brackets 42 that are guided along corresponding guide rails 44. Optionally, the brackets 42 can be rigidly connected to the rest of the second cabin 26, and the guide rails 44 can be arranged on the car frame 22.Furthermore, the brackets 42 can be coupled to the guide rails 44 in such a way that the second cabin 26 is guided in the guide rails 44 by means of the brackets 42 during its movement in a vertical direction relative to the car frame 22.

[0044] The load sensor 36 may be used to measure the weight of the second cabin 26. The load sensor 36 is arranged vertically between the second cabin 26 and the spindle 34 of the spindle drive 30, and thus between the spindle drive 30 and the second cabin 26, such that the load sensor 36 transmits the weight of the movable cabin 26, which is absorbed by the spindle drive 30, to the spindle drive 30. The spindle drive 30 then transmits this portion of the weight of the movable cabin 26 to the support 28. The load sensor 36 thus serves to measure the weight of the movable cabin 26 and to transmit this portion of the weight to the spindle drive 30 and from there to the support 28.In an alternative embodiment, the load measure 36 is arranged in a vertical direction between the support 28 and the spindle drive 30 such that the load measure 36 transfers the part of the weight force of the movable cabin 26, which is absorbed by the spindle drive 30, to the support 28.

[0045] Fig. 2 shows an exemplary embodiment of a car arrangement 22 for the double-decker elevator 10. The car arrangement 20 shown in Fig. 2 can be largely designed in accordance with the car arrangement 20 described with reference to Fig. 1. Therefore, for the sake of brevity and to avoid unnecessary repetition, only the features of the car arrangement 20 shown in Fig. 2 that differ from the car arrangement 20 shown in Fig. 1 will be discussed below.

[0046] In the embodiment shown in Figure 2, the first cabin 24 is arranged to be movable relative to the car frame 22. For this purpose, the first cabin 24 can be coupled to the car frame 22 via the guide elements 42 and the guide rails 44. In contrast, the second cabin 26 is fixed relative to the car frame 22, in particular by means of the brackets 40. In an alternative embodiment (not shown), both cabins 24, 26 can be arranged to be displaceable relative to the car frame 22.

[0047] The support 28 is arranged beneath the first cabin 24 and serves to support the first cabin 24. The car assembly 20 can have two or more spindle drives 30. In the intended arrangement of the car assembly 20, the spindle drives 30 are arranged horizontally spaced apart from one another on the support 28. Furthermore, in the intended arrangement of the car assembly 20, the spindle drives 30 are each arranged vertically between the support 28 and the movable cabin 24, which in this embodiment is the first cabin. Optionally, the spindle drives 30 are arranged such that the first cabin 24 can be displaced vertically relative to the car frame 22 without being guided.With a suitable arrangement of the spindle drives 30 under the first cabin 24, this makes it possible to dispense with the vertical guidance, in particular the brackets 42 and the guide rails 44, for guiding the first cabin 24 within the car frame 22.

[0048] If the second cabin 26 is also arranged to be displaceable relative to the car frame 22, a corresponding support 28 can also be arranged under the second cabin 26, as shown in Figure 1. In this case, two or more corresponding spindle drives 30 can be arranged between the second cabin 26 and the corresponding support 28. Optionally, the load sensor 36 serves to detect the weight of the first cabin 24. The load sensor 36 is arranged vertically between the support 28 and the spindle drive 30 such that the load sensor 36 transmits the weight of the movable cabin 24, which is absorbed by the spindle drive 30, to the support 28. The load sensor 36 thus serves to detect the weight of the movable cabin 24 and to transmit the portion of the weight from the spindle drive 30 to the support 28.In an alternative embodiment, the load meter 36 can be arranged vertically between the spindle drive 30 and the movable cabin 24 such that the load meter 36 transmits the weight force of the first cabin 24, which is absorbed by the spindle drive 30, to the spindle drive 30.

[0049] Figure 3 shows a top view of a cross-section through an exemplary embodiment of a car assembly 20. The car assembly 20 can, for example, essentially correspond to the car assembly 20 described with reference to Figure 2. In the car assembly 20 shown in Figure 3, the car frame 22 has two supports 28, each arranged under the first car 24 and designed to support the first car 24.

[0050] Figure 3 shows that in the top view of the car assembly 20 arranged as intended, not only parts of the spindles 34 and in particular not only the complete spindles 34, but even the complete spindle drives 30 are hidden by the movable car 24.

[0051] In the car arrangements 20 described above, the control unit 50 is configured to control the spindle drive(s) 30, depending on the floor-to-floor distance between the first floor 52 and the second floor 54, such that in a stationary position of the car arrangement 20, the first car 24 is accessible via the first floor 52 and the second car 26 is accessible via the second floor 54. Information about the distances between floors 52 and 54 of the respective building and / or the corresponding access points can be stored, for example, on a memory unit (not shown) of the control unit 50, for instance, in the form of a lookup table in which the floors 52 and 54, with their distances, are assigned corresponding control signals for the spindle drives 30.

[0052] The invention is not limited to the embodiments shown. For example, the embodiments shown can be combined with one another. For example, in the embodiment shown in Figure 1, both cabins 24, 26 or only the first cabin 24 can be designed to be displaceable relative to the car frame 22 by means of one or more of the spindle drives 30. Furthermore, in the embodiment shown in Figure 2, both cabins 24, 26 or only the second cabin 26 can be designed to be displaceable relative to the car frame 22 by means of one or more of the spindle drives 30. Furthermore, in all the embodiments shown, one, two, or more of the spindle drives 30 can be used to displace the corresponding cabin(s) 24, 26 vertically.

[0053] Finally, it should be noted that terms such as "comprising," "encompassing," 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 from other embodiments described above. Reference numerals in the claims are not to be considered as a limitation.

Claims

Patent claims 1. Car assembly for a double-decker elevator (10), wherein the car assembly (20) comprises: a car frame (22); a first car (24) arranged in the car frame (22); a second car (26) arranged in the car frame (22) above or below the first car (24), wherein at least one of the cars (24, 26) is mechanically coupled to the car frame (22) such that it is movable in a vertical direction relative to the car frame (22) and relative to the other car (24, 26), and wherein the car frame (22) has at least one support (28) extending below the movable car (24, 26) and supporting the corresponding car (24, 26); a spindle drive (40) for vertically moving the movable cabin (24, 26) and at least one load meter (36) for measuring the weight force of the movable cabin (24, 26),wherein the spindle drive (30) comprises a vertically extending spindle (34) and a motor (32) for rotating the spindle (34), wherein, in the intended arrangement of the car assembly (20), the spindle (34) is mechanically coupled on one side to a bottom surface (38) of the movable car (24, 26) and on the other side to the motor (32), and the spindle (34) is arranged in a vertical direction between the support (28) and the movable car (24, 26) such that it absorbs at least a part of the weight of the movable car (24, 26) and transmits it to the support (28), characterized in that the load sensor (36) is arranged in a vertical direction between the support (28) and the spindle drive (30) such that the load sensor (36) transmits the part of the weight of the movable car (24, 26) that is absorbed by the spindle drive (30) to the support (28). transfersor the load gauge (36) is arranged in a vertical direction between the spindle drive (30) and the movable cabin (24, 26) such that the load gauge (36) measures the part of the, The weight force of the movable cabin (24, 26), which is absorbed by the spindle drive (30), is transferred to the spindle drive (30).

2. Car arrangement according to claim 1, wherein the spindle (34) is arranged in a vertical direction between the support (28) and the movable cabin (24, 26) such that in a top view of the car arrangement (22) as intended, at least part of the spindle (34) is hidden by the movable cabin (24, 26).

3. Car arrangement according to claim 2, wherein the spindle (34) is arranged in a vertical direction between the support (28) and the movable cabin (24, 26) such that in a top view of the car arrangement as intended the spindle (34) is completely hidden by the movable cabin (24, 26).

4. Carriage arrangement according to claim 1, wherein the spindle drive (30) is arranged in a vertical direction between the support (28) and the movable cabin (24, 26) such that in a top view of the car arrangement (20) as intended the spindle drive (30) is completely concealed by the movable cabin (24, 26).

5. Car arrangement according to one of the preceding claims, comprising: two or more of the spindle drives (30) which, in the intended arrangement of the car arrangement (20), are spaced apart from each other in the horizontal direction on the support (28) and in the vertical direction between the support (28) and the movable cabin (24, 26).

6. Car arrangement according to one of the preceding claims, wherein the spindle drive(s) (30) are arranged such that the movable car (24, 26) can be displaced in a vertical direction without guidance relative to the car frame (22) by means of the spindle drives (30).

7. Double-decker elevator comprising: a car arrangement (20) according to any one of the preceding claims; and - 18 - a control unit (50) configured to control the spindle drive (30) of the car assembly (20) depending on a floor distance between a first floor (52) and a second floor (54) of a building in which the double-decker elevator (10) is arranged, such that in a holding position of the car assembly (20) the first car (24) travels over the first The second cabin (26) is accessible via the second floor (52) and the second cabin (54) is accessible via the second floor (52).

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