Sensor assembly for fastening to an elevator car of an elevator system

Abstract

The invention relates to a sensor assembly (10, 10.1, 10.2, 10.3) for fastening to an elevator car (3.1, 3.2), comprising a first sensor (13.1) for reading a first position code strip (9), a second sensor (13.2) for reading the first position code strip (9), and a housing (11) for accommodating the first sensor (13.1) and the second sensor (13.2), wherein the first sensor (13.1) and the second sensor (13.2) are disposed one above the other on the housing (11) and are seated against a common contact surface (12) so as to have the same orientation relative to the housing (11), and wherein the housing (11) has a fastening device (18) for fastening the housing (11) to the elevator car (3.1, 3.2). The invention also relates to an elevator car (3.1, 3.2) for an elevator system (1) having a sensor assembly (10, 10.1, 10.2, 10.3) of this type, and to an elevator system (1) comprising at least one elevator shaft (2) and at least one aforementioned elevator car (3.1, 3.2) which can be moved along the elevator shaft (2).

Description

[0001] Sensor arrangement for attachment to a car of an elevator system

[0002] Technical area

[0003] The following statements relate to a sensor arrangement for fastening to a car of an elevator system, comprising a first sensor for reading a first position code tape and a second sensor for reading the first position code tape.

[0004] Furthermore, the following statements relate to a car for an elevator system with such a sensor arrangement.

[0005] Furthermore, the following embodiments relate to an elevator system comprising at least one elevator shaft, at least one first position code band extending along the elevator shaft and at least one elevator car movable along the elevator shaft with such a sensor arrangement.

[0006] Technical background

[0007] Elevator systems for the vertical transport of people and / or goods are an integral part of modern residential and commercial buildings. A typical elevator system comprises one or more elevator shafts in which one or more elevator cars are moved between landing positions by means of drives such as suspension drives or linear drives.

[0008] In such elevator systems, it is known that the absolute position of each car is detected by means of a position code tape installed in the elevator shaft along the car's travel path and a sensor attached to the car for reading this code tape. Detecting the absolute position is essential for controlling the elevator system, particularly when multiple cars travel in the same elevator shaft and there is therefore a fundamental risk of collision. Depending on the sensor design, two sensors may be required to detect the absolute position, or two mutually redundant sensors may be provided on the elevator car to prevent a failure of the absolute position detection. However, attaching multiple sensors and, in particular, aligning them with the code tape is relatively complex.

[0009] Description - Technical solution

[0010] Based on this situation, the present task is to simplify the reliable detection of an absolute position in a previously described elevator system.

[0011] The present object is achieved by the features of the independent main claims. Advantageous embodiments are specified in the subclaims. To the extent technically feasible, the teachings of the subclaims can be combined arbitrarily with the teachings of the main and subclaims.

[0012] In particular, the object is accordingly achieved by a sensor arrangement for fastening to a car of an elevator system, comprising a first sensor for reading a first position code band, a second sensor for reading the first position code band and a housing for accommodating the first sensor and the second sensor, wherein the first sensor and the second sensor are arranged one above the other on the housing and rest on a common contact surface for their identical alignment with respect to the housing and wherein the housing has a fastening device for fastening the housing to the car.

[0013] Advantageous aspects are explained below, and preferred modified embodiments are described further below. Explanations, particularly regarding advantages and definitions of features, are essentially descriptive and preferred, but not limiting, examples. If an explanation is limiting, this will be expressly stated.

[0014] Where ordinal numbers ("first", "second", etc.) are used, for example to designate a component, an element, a process step, or a process action, these ordinal numbers are intended purely for differentiation in the designation and do not indicate any dependencies or sequences. This means, in particular, that, for example, a device does not have to have a "first component" in order to have a "second component." A device can also have a "first component" and a "third component" without necessarily having a "second component." Multiple units with the same ordinal number can also be provided, for example, multiple "first components."

[0015] According to the present understanding, an elevator system is designed, for example, with at least one vertical and / or horizontal elevator shaft and at least one elevator car, but can also have several elevator shafts and / or several elevator cars, in particular several elevator cars in one elevator shaft.

[0016] An elevator car, for example, is held and driven by a suspension element, with a drive device transmitting a drive torque to the suspension element via the drive shaft. The suspension element is also preferably connected to a counterweight associated with the car. A drive device is arranged, in particular, in a machine room above the elevator shaft(s) or in an upper section of an elevator shaft, the so-called shaft head. A suspension element is designed, in particular, as a rope, belt, strap, chain, or the like and carries tensile loads in the direction of its longitudinal extension.

[0017] Alternatively, a car is held and driven by a linear drive. A linear drive in an elevator system, for example, is formed from a primary part extending along the elevator shaft and a secondary part located on the car. The primary part is made up of coils arranged one behind the other in a line, each of which is assigned a converter. Current is supplied to the coil to generate a magnetic field when the car is in the area of ​​the respective coil. The magnetic field is generated in such a way that the car is attracted or repelled by the magnetic field depending on its intended travel path. The secondary part is formed by a permanent magnet or electromagnet that interacts with the magnetic fields of the coil.

[0018] An elevator shaft is a continuous shaft that extends over multiple floors and / or along multiple areas of a building and has a cross-section designed for the passage of the elevator car. An elevator shaft of the elevator system can extend vertically and / or horizontally. In one embodiment, the elevator system has at least one partial section of the elevator shaft in which the shaft extends vertically and at least one partial section in which the elevator shaft extends horizontally, wherein the elevator car can move from the vertically extending section to the horizontally extending section.

[0019] A position code tape extends in a strip-like manner along the elevator shaft and has a multitude of position marks that a sensor can use to determine the current position of the elevator car. The position marks are therefore uniquely assigned to a position along the position code tape. The position code tape can be a metal or plastic tape, for example, but can also be formed by printing position marks on any stationary component of the elevator system that extends along the elevator shaft. The position marks can be optical marks such as barcodes or QR codes, for example, but they can also be magnetic, acoustic, or otherwise readable marks. The optical marks can also be formed, for example, by punching or perforating the position code tape with specific hole or perforation patterns that vary along its length.A sensor for reading the position code tape is accordingly designed, for example, as an optical, magnetic, acoustic or other position mark-operating sensor and is positioned relative to the position code tape in such a way that it can detect the position marks and reliably read them to determine the absolute position in the elevator shaft.

[0020] A housing is designed to surround the sensors on at least one side and is therefore formed by a plate in the simplest case. The housing thus provides at least the function of a common contact surface for the sensors. In particular, the housing also provides a protective function for the sensors and for this purpose surrounds the sensors on more than one side. In particular, the housing at least partially encloses the sensors. A common contact surface is defined by a plane in which the contact surface extends, whereby the contact surface can also be designed in multiple parts or with interruptions. Insofar as the sensors are arranged one above the other on the housing, the referenced vertical direction corresponds to an extension of the position code tape in the elevator shaft. The sensors then read superimposed sections of the position code tape simultaneously.

[0021] In the simplest case, a fastening device is formed by a recess for receiving a fastening means such as a screw, a bolt or a clip and is arranged such that the sensors are positioned opposite the position code tape when the housing is fastened to the car.

[0022] The solution to the problem with the sensor arrangement described above now includes the teaching that sensors are arranged on a common housing and are identically aligned with respect to the housing. The sensors can then be attached to the housing at the factory, wherein in particular an identical alignment is already created by the common contact surface. The sensors are positioned one above the other so that when the sensor arrangement is attached to a car in an elevator system, both sensors are positioned identically with respect to the first position code tape and only differ from each other in their height position with respect to the first position code tape. In this respect, it is possible to position only the housing with respect to the car or in the elevator system during assembly in order to simultaneously achieve secure positioning of both sensors with respect to the first position code tape.Advantageously, the assembly and, in particular, the respective positioning of sensors during assembly of the elevator system is thus greatly simplified and consolidated into a single work step. The different height positions of the sensors can be easily taken into account on the control side. Furthermore, with the sensor arrangement, both sensors can read the same position code tape, and no additional position code tape needs to be arranged in the elevator shaft in addition to the first position code tape to operate two sensors. Furthermore, the above-described teaching can, within the meaning of the present disclosure, also be extended to more than two sensors arranged one above the other on the housing and resting on a common contact surface for their identical alignment with respect to the housing.

[0023] In one embodiment, the two sensors are each single-channel sensors, which together represent two channels of a measurement signal and thus enable reliable position detection. Unless otherwise stated, however, the present disclosure always assumes dual-channel sensors, which already provide a reliable signal on their own.

[0024] In an alternative embodiment, the sensors are each assigned to different controllers or different control circuits. For example, the sensors are configured or configured differently to correspond to the respective control protocols of the different control circuits.

[0025] As an alternative to the features described above, or in a preferred embodiment of the above, the first sensor and the second sensor are mutually redundant. If the sensors are mutually redundant, both are read in the same way by a controller, in particular a safety controller, of the car or elevator system and serve as control variables for the same control loops. If one of the sensors fails or can no longer determine the absolute position, the other continues to determine the absolute position, so that the absolute position is determined at all times.

[0026] As an alternative to the features described above, or in a preferred embodiment of the above, the fastening device is arranged on a side of the housing facing away from the sensors. On the one hand, this advantageously allocates the available installation space on the housing. On the other hand, the sensors can then be attached to the car in a laterally protruding or projecting manner, so that the sensors are positioned relatively close to the first position code strip, while the car advantageously maintains a greater safety distance from the first position code strip.

[0027] As an alternative to the features described above, or in a preferred embodiment of the above, the housing is designed to be alignable relative to the elevator car in at least one direction or about at least one axis of rotation by means of the fastening device. Due to the existing alignment of the sensors relative to the housing by means of the common contact surface, both sensors can then be finely aligned relative to the first position code strip simultaneously and in a single step, in addition to simple positioning. This ensures, in particular, that the actual positional relationship between the first position code strip and the elevator car or the housing attached to it can be responded to by fine alignment at the installation location of the elevator system.In a preferred embodiment of the immediately above-described device, the housing is designed to be tiltable by means of the fastening device about a rotational axis running parallel to a transverse direction of a code-bearing surface of the first position code strip. It is then easily adjustable so that the two superimposed sensors are at the same or each at a suitable distance from the first position code strip.

[0028] As an alternative to the features immediately above, or in a preferred embodiment of the immediately above, the fastening device is designed with at least one elongated hole for receiving a fastening means to enable the housing to be aligned. The elongated hole then corresponds in particular to a recess fixedly positioned on the car for receiving the fastening means, for example, on its own for translational mobility of the housing or in cooperation with a round hole on the fastening device for receiving a further fastening means for rotational mobility of the housing, wherein an axis of rotation of the rotational movement runs coaxially with the round hole. The alignment is thus made possible in a simple manner that is easy to operate in the installation situation.

[0029] As an alternative to the features described above, or in a preferred embodiment of the above, the housing has at least one passage on the contact surface for access to the sensors from the side facing away from the sensors. This makes it possible, for example, to visually check the sensor, for example a status LED or a display, or to maintain the sensor from the rear of the housing. In particular, if the sensor arrangement projects beyond the car on the roof side, the inspection or maintenance can be carried out from the car roof without the person carrying out the inspection or maintenance having to bend over the car roof. Likewise, if the sensor arrangement projects beyond the car on the floor side, the person carrying out the maintenance does not have to bend out of an area of ​​the car. In addition, the sensors are then not accessible through the elevator shaft orthe first position code band located in front of the sensors is restricted. The sensors are then preferably configured such that maintenance-relevant components are arranged in the area of ​​the penetration, facing the contact surface.

[0030] In a preferred embodiment of the immediately above-described features, at least one connecting cable of at least one sensor is routed through the at least one aperture. The connecting cable is thus connected to the rear of a measuring device of the sensors facing away from the contact surface, thus precluding any interference with the measurement by the connecting cable. Furthermore, in the case of a sensor arrangement extending beyond the car on the roof side, the connecting cable is thus conveniently routed to a connection point on the car side.

[0031] As an alternative to the features described above, or in a preferred embodiment of the above, the housing covers the sensors on at least one other side in addition to the contact surface. In this way, the sensors are securely protected against misalignment or damage, for example, inadvertently by a person on the car roof during maintenance, as well as against the ingress of dust and / or liquids. Sensor failure is thus optimally prevented. Furthermore, it can be provided that, in addition to the shared contact surfaces, additional contact surfaces for aligning the respective sensor relative to the housing are created on the overlaps on the other sides.

[0032] In a preferred embodiment of the immediately above-described features, the housing covers and, in particular, extends beyond the sensors on an upper side to protect them. This covering, in particular, provides protection against dust, objects, and / or liquids falling into the elevator shaft, thus protecting the sensors from contamination and damage caused by such objects or substances.

[0033] As an alternative to the features described above, or in a preferred embodiment of the above, the sensors are optical sensors for reading a first position code band arranged in a fixed position in an elevator shaft of the elevator system. With regard to such optical sensors, whose positioning relative to the first position code band is essential for reliable position detection, the simplified positioning of the sensors on the elevator car compared to the prior art is particularly advantageous, since the individual positioning of the sensors is particularly complex. In particular, with optical sensors having the features described above regarding the alignability of the housing on the elevator car, particularly reliable detection of the absolute position can be achieved.

[0034] As an alternative to the features described immediately above, the sensors are magnetic sensors for reading a first position code tape held in the elevator shaft and guided along the sensors. Thus, if the sensor tape is guided through corresponding guides of the sensors, precise alignment of the guides to one another is achieved in a particularly simple manner by aligning the sensors on the contact surface of the housing. For clean and permanently damage-free operation of the sensors on the first position code tape or of the first position code tape on the sensors, the precise positioning of the sensors is essential, and in particular, alignability is also relevant, so that the advantages of the teaching described above are achieved to a particular degree in this regard as well.

[0035] The problem is further solved by a car for an elevator system with a sensor arrangement as described above. The car provides the corresponding advantages described above with regard to the sensor arrangement. Thus, the positioning of the sensors relative to the first position code band is made significantly easier.

[0036] The object is further achieved by an elevator system comprising at least one elevator shaft, at least one first position code tape extending along the elevator shaft, and at least one previously described elevator car movable along the elevator shaft. The sensor arrangement for reading the first position code tape by the sensors is positioned on the elevator car. The elevator system achieves the advantages described above with respect to the sensor arrangement and the car in a corresponding manner. In particular, the positioning of the sensors relative to the first position code tape is made significantly easier in the elevator system.

[0037] In a preferred embodiment of the immediately above-described embodiment, the elevator system has at least two cars that can travel in the same elevator shaft. Since the detection of the absolute position is particularly important when there are multiple cars in the same elevator shaft, among other things, to reliably prevent collisions between the cars, simplified detection of the absolute position is particularly advantageous.

[0038] Short description of the drawings

[0039] A preferred technical solution is explained in more detail below with reference to the accompanying drawings using preferred embodiments. The term "figure" is abbreviated to "Fig." in the drawings.

[0040] The drawings show

[0041] Fig. 1 is a highly schematic view of an elevator installation in one embodiment;

[0042] Fig. 2a is a perspective view of a sensor arrangement in a first embodiment;

[0043] Fig. 2b is a further perspective view of the sensor arrangement according to Figure 2a;

[0044] Fig. 2c shows a detailed view of a fastening device of the sensor arrangement according to Figures 2a and 2b;

[0045] Fig. 3a is a perspective view of a sensor arrangement in a second embodiment;

[0046] Fig. 3b is a further perspective view of the sensor arrangement according to Figure 3a;

[0047] Fig. 3c shows a detailed view of a sensor of the sensor arrangement according to Figures 3a and 3b;

[0048] Fig. 4a is a perspective view of a sensor arrangement in a third embodiment; and

[0049] Fig. 4b is a further perspective view of the sensor arrangement according to Figure 4a.

[0050] Detailed Description of the Drawings The described embodiments are merely examples that can be modified and / or supplemented in a variety of ways within the scope of the claims. Each feature described for a specific embodiment can be used independently or in combination with other features in any other embodiment. Each feature described for an embodiment of a specific claim category can also be used correspondingly in an embodiment of a different claim category.

[0051] Figure 1 shows an elevator installation 1 with an elevator shaft 2 and a first elevator car 3.1 that can be moved in the vertical direction V in the elevator shaft 2 and a second elevator car 3.2 that can be moved in the vertical direction V in the elevator shaft 2. The elevator shaft 2 has a shaft pit 2.1 and a shaft head 2.2 and extends below a machine room 4. The elevator cars 3.1, 3.2 are guided in the elevator shaft 2 on guide rails (not shown in detail) and held on support means 5.1, 5.2, which are each guided via deflection means 6 and drive devices 7.1, 7.2 and are further connected to counterweights 8.1, 8.2.

[0052] Furthermore, a first position code strip 9 is arranged in the elevator shaft 2 along the travel path of the cars 3.1, 3.2. On a side facing the cars 3.1, 3.2, the first position code strip 9 has, over its entire extent, only indicated graphically, position marks 9.1, here each designed as QR codes. The position marks 9.1 differ from one another and are each uniquely identifiable, so that the position in the elevator shaft 2 can be detected using a respective position mark 9.1. Furthermore, sensor assemblies 10, described in more detail below, are attached to the cars 3.1, 3.2, purely by way of example, on an underside of the first car 3.1 and on a car roof of the second car 3.2. By reading a respective position mark 9.1 and their unique identification, a respective sensor of the sensor arrangement 10 detects its absolute position in the elevator shaft 2 and thus the absolute position of the respective car 3.1, 3.2 in the elevator shaft 2.

[0053] Figures 2a and 2b show a sensor arrangement 10.1 in a first embodiment. The sensor arrangement 10.1 comprises a housing 11 with a base plate 11.1 as well as side walls 11.2 and an upper cover 11.3. The base plate 11.1 forms a contact surface 12 for a first sensor 13.1 and a second sensor 13.2, which are thus aligned with respect to the housing 11. The sensors 13.1, 13.2 also bear against the side walls 11.2 and are connected to the base plate 11.1 by means of fastening means 14. The sensors 13.1, 13.2 in the sensor arrangement 10.1 are each designed as optical sensors. On a side of the sensors 13.1, 13.2 facing away from the base plate 11.1 or the contact surface 12, the sensors 13.1, 13.2 have optical measuring devices 15. On one side of the sensors 13.1, 13.2 facing the base plate 11.1 or the contact surface 12, the sensors 13.1, 13.2 contains control and maintenance-relevant components (not shown in detail), for access to which the base plate 11.1 has several openings 16. Connecting cables 17.1, 17.2 of the sensors 13.1, 13.2 are also routed through the openings 16.

[0054] The sensor assembly 10.1 or the housing 11 further comprises a fastening device 18 configured as a U-profile with a base leg 18.1 and two lateral legs 18.2. The fastening device 18 is connected to the side walls 11.2 via fastening means 20 configured as screws and further comprises elongated holes 21 for receiving fastening means 22 configured as screws for fastening the sensor assembly 10.1 to a car 3.1, 3.2. The fastening to the car 3.1, 3.2 is achieved, for example, via a C-clamp 19 (not shown in detail here) on a clamping rail of the car 3.1, 3.2. Through the elongated holes 21, the sensor arrangement 10.1 can be attached to the car 3.1, 3.2 in a first direction R1 in various positions in order to adjust the distance between the sensors 13.1, 13.2 and the first position code band 9.

[0055] Figure 2c shows the fastening device 18 in detail in a side view and without depicting the fastening means 20. It can be seen that the fastening means 20 are received on the one hand in an elongated hole 23 and on the other hand in a round hole 24 on the lateral legs 18.2, so that the sensor arrangement 10.1 can be tilted about a rotation axis DA defined by the round hole 24. The housing 11 or its side walls 11.2 can be attached to the fastening device 18 in a tilted manner more precisely in order to finely align the sensors 13.1, 13.2 relative to the first position code strip 9.

[0056] Figures 3a and 3b show a sensor arrangement 10.2 in a further embodiment, which is similar to sensor arrangement 10.1 in a number of features not described again. In contrast to sensor arrangement 10.1, sensors 13.1, 13.2 in sensor arrangement 10.2 are designed as magnetic sensors, as shown in more detail in Figure 3c, and each have a guide 25 in which a first position code tape 9 designed as a magnetic tape is received and guided. Due to the arrangement of sensors 13.1, 13.2 one above the other and their alignment on the common contact surface 12, the respective guides 25 are aligned with one another.

[0057] As a further difference from the sensor arrangement 10.1, the fastening device 18 is not movable relative to the housing 11, but is formed integrally with the housing 11. By guiding the first position code strip 9 along the guide 25 of the magnetic sensors 13.1, 13.2, a vertical alignment of the sensors 13.1, 13.2 relative to the first position code strip 9 is absolutely necessary, so that the ability to adjust a tilt angle is not necessary.

[0058] Figures 4a and 4b show a sensor arrangement 10.3 in a further embodiment, which is similar to the sensor arrangements 10.1, 10.2 in a number of features not described again. The sensors 13.1, 13.2 in the sensor arrangement 10.3 are designed as magnetic sensors, and a guide 26 is fixedly positioned relative to the sensors 13.1, 13.2 on the sensor arrangement 10.3, which guide consists of three

[0059] Guide elements 26.1, 26.2, 26.3, in which a first position code tape 9 designed as a magnetic tape is received and guided.

[0060] The two sensors 13.1, 13.2 are designed as different magnetic sensors and, in particular, output sensor signals of a different data format, which can be used for different control circuits and / or in common control circuits.

[0061] List of reference symbols

[0062] 1 elevator system

[0063] 2 elevator shaft

[0064] 2.1 Shaft pit of the elevator shaft

[0065] 2.2 Shaft head of the elevator shaft

[0066] 3.1 first car

[0067] 3.2 second car

[0068] 4 Engine room

[0069] 5.1 first support means

[0070] 5.2 second support means

[0071] 6 pulley

[0072] 7.1 first drive device

[0073] 7.2 second drive device

[0074] 8.1 first counterweight

[0075] 8.2 second counterweight

[0076] 9 first position code band

[0077] 9.1 Position marks of the first position code band

[0078] 10 Sensor arrangement

[0079] 10.1 Sensor arrangement

[0080] 10.2 Sensor arrangement

[0081] 10.3 Sensor arrangement

[0082] 11 Sensor assembly housing

[0083] 11.1 Base plate of the housing

[0084] 11.2 Side panel of the housing

[0085] 11.3 top cover of the housing

[0086] 12 contact surface

[0087] 13.1 first sensor

[0088] 13.2 second sensor

[0089] 14 fasteners

[0090] 15 optical measuring device

[0091] 16 Passage in the base plate or the contact surface

[0092] 17.1 first connection cable 17.2 second connection cable

[0093] 18 Fastening device

[0094] 18.1 Base leg of the fastening device

[0095] 18.2 side leg of the fastening device 19 C-clamp

[0096] 20 fasteners

[0097] 21 slot

[0098] 22 fasteners

[0099] 23 Long hole 24 Round hole

[0100] 25 leadership

[0101] 26 Guide

[0102] 26.1 Guide element

[0103] 26.2 Guide element 26.3 Guide element

[0104] DA rotation axis

[0105] R.1 first direction

[0106] V vertical direction

Claims

Claims 1. Sensor arrangement (10, 10.1, 10.2, 10.3) for fastening to a car (3.1, 3.2) of an elevator installation (1), comprising a first sensor (13.1) for reading a first position code tape (9); a second sensor (13.2) for reading the first position code tape (9); and a housing (11) for accommodating the first sensor (13.1) and the second Sensors (13.2); wherein the first sensor (13.1) and the second sensor (13.2) are arranged one above the other on the housing (11) and rest against a common contact surface (12) for their identical alignment with respect to the housing (11); and wherein the housing (11) has a fastening device (18) for fastening the housing (11) to the car (3.1, 3.2).

2. Sensor arrangement (10, 10.1, 10.2, 10.3) according to claim 1, wherein the first sensor (13.1) and the second sensor (13.2) are redundant to each other 3. Sensor arrangement (10, 10.1, 10.2, 10.3) according to claim 1 or 2, wherein the fastening device (18) is arranged on a side of the housing (11) facing away from the sensors (13.1, 13.2).

4. Sensor arrangement (10, 10.1, 10.2) according to one of the preceding claims, wherein the housing (11) is designed to be alignable relative to the car (3.1, 3.2) in at least one direction (R1) or about at least one axis of rotation (DA) by means of the fastening device (18).

5. Sensor arrangement (10, 10.1, 10.2, 10.3) according to claim 4, wherein the housing (11) is designed to be tiltable by means of the fastening device (18) about an axis of rotation (DA) running parallel to a transverse direction of a code-bearing surface of the first position code band (9).

6. Sensor arrangement (10, 10.1, 10.2, 10.3) according to claim 4 or 5, wherein the fastening device (18) for aligning the housing (11) is designed with at least one elongated hole (21, 23) for receiving a fastening means (20, 22).

7. Sensor arrangement (10, 10.1, 10.2, 10.3) according to one of the preceding claims, wherein the housing (11) has at least one passage (16) on the contact surface (12) for access to the sensors (13.1, 13.2) from the side facing away from the sensors (13.1, 13.2).

8. Sensor arrangement (10, 10.1, 10.2, 10.3) according to claim 7, wherein at least one connecting line (17.1, 17.2) of at least one sensor (13.1, 13.2) is guided through the at least one passage (16).

9. Sensor arrangement (10, 10.1, 10.2, 10.3) according to one of the preceding claims, wherein the housing (11) covers the sensors (13.1, 13.2) next to the contact surface (12) on at least one further side.

10. Sensor arrangement (10, 10.1, 10.2, 10.3) according to claim 9, wherein the housing (11) covers and in particular projects beyond the sensors (13.1, 13.2) on an upper side for their protection.

11. Sensor arrangement (10, 10.1, 10.2, 10.3) according to one of the preceding claims, wherein the sensors (13.1, 13.2) are optical sensors (13.1, 13.2) for reading a first position code band (9) arranged in a fixed position in an elevator shaft (2) of the elevator installation (1).

12. Sensor arrangement (10, 10.1, 10.2, 10.3) according to one of claims 1 to 10, wherein the sensors (13.1, 13.2) are magnetic sensors (13.1, 13.2) for reading a first position code tape (9) held in the elevator shaft (2) and guided on the sensors (13.1, 13.2).

13. Car (3.1, 3.2) for an elevator installation (1) with a sensor arrangement (10, 10.1, 10.2, 10.3) according to one of the preceding claims.

14. Elevator installation (1), comprising at least one elevator shaft (2); at least one first position extending along the elevator shaft (2) Code tape (9); and at least one elevator car (3.1, 3.2) movable along the elevator shaft (2) according to claim 13; wherein the sensor arrangement (10, 10.1, 10.2, 10.3) for reading the first position Code bands (9) are positioned on the car (3.1, 3.2) by the sensors (13.1, 13.2).

15. Elevator installation (1) according to claim 14, comprising at least two elevator cars (3.1, 3.2) movable in the same elevator shaft (2).

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