Sensor unit

Abstract

The invention relates to a sensor unit (1) for insertion into an insertion opening (20) in an end face (18) of a door frame (3) of an elevator system and for detecting objects in a doorway (2). The sensor unit has a sensor module (4) for detecting an object in the doorway (2). A sensor of the sensor module (4) detects radiation suitable for being absorbed and / or reflected by an object to be detected. The sensor unit has a sensor receptacle (5) for receiving a sensor module (4). The sensor unit has a first holding element (6) mounted or formed on the sensor receptacle (5). The first holding element (6) is suitable for holding the sensor unit (1) inserted into an insertion opening (20) in the door frame (3). The sensor unit has a cover (14) and a first cover receptacle (10), wherein the cover (14) is transparent to radiation. The first cover receiving portion (10) is in the form of a flat surface and receives the cover (14). The cover (14) is arranged flat. The cover (14) is formed and arranged such that it is adapted to close an insertion opening (20) in the door frame (3) flush with respect to the end face (18).

Description

Technical Field

[0001] The present invention relates to the door frame of an elevator system and a method for mounting a sensor unit on the door frame. Background Technology

[0002] In an elevator system, the car typically moves vertically along a travel path between different floors or levels within a building. The car and floors have door openings. These door openings can be closed by doors with door panels. The door panels have actuators. When the doors open, a doorway is formed. At different floors, people can enter or exit the car through the doorway. Goods can also be transported into or out of the car through the doorway. Sensor units can be used to monitor the area of ​​the doorway. If an object, such as a person or item, is in the doorway, monitoring can, for example, ensure that the door remains open. Furthermore, for example, if one of the sensor units detects a new object entering the doorway area while the door is already closing, the initiated door closing process can be aborted. These objects may collide with the closing door, causing damage to the door or the object. In particular, people may be injured. Therefore, sensor units are used to ensure the safety of the system and the safety of the people using the system.

[0003] For example, US application 2021047147 A1 illustrates such a sensor unit, referred to herein as a transceiver unit. These sensor units are used to monitor doorways. US 6631788 B2 illustrates a system for monitoring doorways using spatially separated transceiver units.

[0004] Sensor units are delicate. For example, they are prone to getting dirty. Furthermore, they may be pushed, dented, or shaken during loading or unloading. Additionally, the suspension of the sensor unit may be prone to bending. These effects can impair the function of the sensor unit and thus compromise passenger and system safety. Therefore, damaged sensor units should be easily and quickly replaceable. Summary of the Invention

[0005] Therefore, one object of the present invention can be regarded as providing a sensor unit that can be easily replaced.

[0006] According to a first aspect of the invention, this objective is achieved by a door frame of an elevator system. The door frame has an end face. The end face of the door frame has an insertion opening, into which a sensor unit is inserted. The sensor unit has a sensor module for detecting objects in the doorway. The sensor module's sensor detection is adapted to detect radiation absorbed and / or reflected by the object to be detected. The sensor unit also has a sensor housing for receiving the sensor module. The sensor unit also has a first retaining element mounted or formed on the sensor housing. The first retaining element is adapted to retain the sensor unit when it is inserted into the insertion opening of the door frame. The sensor unit also has a cover. The cover is transparent to radiation. The cover and the end face form a flat surface. The first retaining element is designed as a snap-fit.

[0007] According to a second aspect of the invention, this objective is achieved by a method for mounting a sensor unit according to a first aspect of the invention on a door frame. The method comprises the following steps: - Insert the sensor unit into the insertion opening in the door frame; - Use a first retaining element and / or a second retaining element to secure the sensor unit to the door frame.

[0008] The possible features and advantages of embodiments of the present invention can be considered in particular based on the concepts and findings described below, and are not intended to limit the invention.

[0009] The sensor unit is used to detect objects in a doorway area. Objects are detected by altering the path of the radiated beam. The radiation can be electromagnetic waves, such as light, especially infrared light. Other types of electromagnetic radiation, such as microwaves, can also be used. Sound, especially ultrasound, can also be used as radiation. The radiation can originate from the environment. Alternatively, the radiation can come from a radiation source specifically installed for this purpose. Such a radiation source can be located, for example, on an elevator, in the elevator car, on a door frame, or particularly within the sensor module.

[0010] Radiation is absorbed or reflected by objects. This alters the beam path, causing the sensor to detect different radiation levels when an object is present in the doorway compared to when no object is present. Evaluation electronics determine the presence or absence of an object in the doorway region based on the detected radiation levels.

[0011] According to a preferred embodiment, the sensor module functions based on optical measurement principles. Optical measurement principles are based on the measurement of light. Examples of such optical measurement principles include camera systems or brightness sensors. The doorway can be illuminated by the sensor unit. Infrared light sensors have the advantage that the doorway can be illuminated with infrared light without the passengers noticing the light. Alternatively, the sensor unit can be designed for visible light. This has the advantage that, for example, ambient light from the car lights or the floor can be used as illumination. However, systems such as laser triangulation sensors can also be used, where a laser is mounted as the light source. This again has the advantage that lasers are virtually unaffected by interference because they cover only a very narrow frequency range and are therefore easily distinguishable from light from other sources.

[0012] When the sensor unit is inserted into the door frame, the cover forms a flat surface with the end face of the door frame. This has the following advantages: the cover closes the opening flush with the end face. This means that the sensor module is well protected from dirt, and the end face of the door frame is easy to clean.

[0013] According to a preferred embodiment, the cover is designed as a flat part of uniform thickness. The cover of the sensor unit is cut or stamped from a material of uniform thickness. This material is preferably a plastic with a thickness between 0.2 mm and 4 mm.

[0014] According to a preferred embodiment, the cover absorbs or reflects visible light and is transparent to infrared light. This has the following advantages: for the human eye, the cover conceals the interior of the sensor unit. Infrared light penetrates the cover and can be used by the sensor module to detect objects in the doorway. In particular, this allows for the use of a sensor unit that can both emit and detect reflected infrared light.

[0015] This conceals the sensor unit, especially if the cover is made of a material that is opaque to visible light, with the same surface or coating as the end face of the door frame. For example, a strip of the same material as the cover can be arranged along the end face of the door frame as a door frame cover. The insertion opening is then preferably arranged within this strip. Since the door frame cover and the cover are now made of the same material, the cover is discreetly hidden within the door frame cover. This has the advantage that the sensor unit remains unnoticeable, and therefore is less likely to be covered or contaminated by, for example, a vandal. The door frame cover can be completely interrupted, such that the cover is arranged between two parts of the door frame cover. Alternatively, the door frame cover can have a recess or hole for receiving the cover.

[0016] The door frame preferably has a door frame structure and a door frame cover, the door frame structure preferably being made of metal to ensure the strength of the door frame, and the door frame cover to ensure the optical properties of the end face.

[0017] According to a preferred embodiment, the end face and / or cover of the door frame are designed to be retroreflective. Retroreflection describes the property that a portion of light incident on a retroreflective surface is reflected back in the same direction from the point on the surface where the light is incident.

[0018] Preferably, the material of the end faces of the cover and / or door frame is both partially transparent and partially retroreflective. This means that when a beam is incident on the material, a first major portion passes directly through the material, and a second major portion is retroreflected. The proportion of light deflected in all other directions is preferably negligible. This has the advantage that the radiation source of the sensor module emits radiation, which can pass through the cover and illuminate the doorway. In the absence of objects in the beam path, the radiation is then retroreflected at the opposite end faces of the door frame and thus reflected onto the sensor unit. The retroreflective material on the two opposite end faces and the retroreflective material of the cover(s) of the sensor unit(s) are at least partially the same material. This retroreflective material on the end faces of the door frame can be referred to as the door frame cover. For example, it can be glued to the door frame. The cover is preferably seamlessly fitted into the door frame cover of the end faces and is therefore invisible to passengers. Preferably, in this arrangement within the sensor module, the radiation source is mounted close to the sensor at a slight offset, such that radiation retroreflected by the cover when leaving the sensor unit is reflected back to the radiation source only, and not back to the sensor. Therefore, the sensor only receives radiation from outside the sensor unit.

[0019] Preferably, the sensor module has a light source that acts as a radiation source, illuminating the end face of the door frame opposite the sensor unit. Visible or infrared light is preferably used. The end face has a retroreflective surface that reflects light back toward the sensor unit, where the light is detected by a camera (particularly a line scan camera). Objects in the beam path prevent at least some of the light from returning to the sensor unit. Since the cover can also be retroreflective, a continuous retroreflective surface can be designed on the end face. Therefore, even if another sensor unit is embedded in the end face of the door frame opposite to the sensor unit, the retroreflective surface remains continuous even on that other sensor unit. The continuous retroreflective surface allows the sensor unit opposite to this surface to monitor the passageway between the sensor unit and the retroreflective surface without gaps. Such gaps may occur in cases where sensor units without retroreflective surfaces may be installed.

[0020] Several sensor units can be mounted on opposite end faces of the door frame. Retroreflective covers on the sensor units allow radiation from other sensor units to be reflected back to the respective sensor unit, even at the location of the cover. Therefore, all sensor units have opposite end faces with a continuous, uninterrupted retroreflective surface. Thus, the sensor unit can seamlessly monitor the area between itself and the retroreflective surface.

[0021] Furthermore, the sensor unit is indistinguishable in a continuous retroreflective surface, and the end face appears continuous and uniform.

[0022] According to a preferred embodiment, the sensor unit has a first cover receiving portion. The first cover receiving portion is designed with a flat surface and receives a cover. The cover receiving portion, and preferably also a flat cover, contacts and is attached to the cover receiving portion. The cover can be bonded to the cover receiving portion by means of an adhesive, or it can be welded to the cover receiving portion by ultrasonic welding. The cover receiving portion is preferably designed on the sensor receiving portion.

[0023] According to a preferred embodiment, the cover of the sensor unit is substantially rectangular. A first cover receiving portion receives the cover along a first side of the rectangle, and a second cover receiving portion receives the cover along a second side of the rectangle. The first and second sides are opposite. Therefore, the cover is rectangular in shape and rests on the first and second cover receiving portions at both ends of the rectangle. For example, the rectangle may have rounded corners, which makes the corners of the rectangle more robust or stable. Therefore, they are not easily damaged.

[0024] The cover may have two holes to ensure proper alignment between the cover and the sensor housing when assembling the sensor unit. These two holes can precisely engage with two pins on the sensor housing, resulting in the cover being installed in proper alignment with the sensor housing.

[0025] According to a preferred embodiment, the sensor module is arranged between the first cover receiving portion and the second cover receiving portion. The cover preferably rests on the sensor module between the first and second cover receiving portions. This means that the width of the sensor unit can substantially correspond to the width of the sensor module. This allows the width of the door frame to remain relatively small. Because the first and second cover receiving portions are arranged above and below the sensor module, the sensor unit will not be significantly wider than the minimum width of the sensor unit predetermined by the width of the sensor module. The door frame essentially only needs to be two wall thicknesses wider than the sensor module. Therefore, the width of the door frame, especially the minimum width, substantially corresponds to the width of the sensor module.

[0026] One advantage of the sensor unit is that the sensor module can be quickly and accurately aligned and attached to the door frame. The sensor receiver accommodates the sensor module and fully defines the orientation and position of the sensor module relative to the sensor receiver. The sensor receiver is designed such that when inserted into the insertion opening, it forms a form-fit with the door frame, thereby determining the alignment and position of the sensor relative to the door frame. The sensor receiver is preferably manufactured using an injection molding process. Metal or plastic is a suitable material for production.

[0027] The sensor unit inserted into the insertion opening can preferably move only substantially perpendicular to the end face of the door frame. A form-fit connection prevents displacement or torsion in all other directions. This movement option is used to insert or remove the sensor unit from the insertion opening. This mobility is limited by a first retaining element. The first retaining element holds the sensor housing, and thus the entire sensor unit, onto the door frame. For this purpose, the retaining element engages behind the edge of the door frame. In a simple first embodiment, the retaining element can be, for example, a latch that moves behind the edge, for example, by a rotational movement, thereby securing the sensor unit in the insertion opening. The latch retracts to allow insertion into the insertion opening. If the sensor unit is correctly positioned, the latch can be rotated via a shaft projecting from the rear of the sensor unit or by means of a screwdriver, such that the latch forms a form fit with the door frame, and particularly with the door frame structure.

[0028] The first retaining element is designed as a snap-fit. The snap-fit ​​engages with the door frame in a form-fit manner. However, the snap-fit ​​can be deformed to release the form-fit connection again to remove the sensor unit. The snap-fit ​​is preferably made of the same material and using the same working steps as the sensor housing. Preferably, the snap-fit ​​is also manufactured during the injection molding process. Alternatively, the snap-fit ​​can be additionally mounted to the sensor housing, for example, as a bent element made of spring steel.

[0029] According to a preferred embodiment, a first cover receiving portion is formed in a first retaining element, and a second cover receiving portion is formed in a second retaining element. Integrating the first and second retaining elements into the respective cover receiving portions is advantageous, particularly for production using injection molding processes.

[0030] In particular, both cover housings are designed as separate flat surfaces for the sensor housings.

[0031] According to a preferred embodiment, the sensor receiving portion has a shape-fitting profile portion, wherein the shape-fitting profile portion receives the sensor module in a shape-fitting manner. This shape-fitting profile portion can, for example, be formed as a recess in the sensor receiving portion. A portion of the sensor module can engage in the recess and is thus held in the shape-fitting profile portion in a shape-fitting manner.

[0032] According to a preferred embodiment, the fastening device secures the sensor module within the sensor housing. Preferably, the sensor module is thus further secured to the sensor housing by the fastening device. For example, the sensor module can be held in place within the form-fitting profile and on the sensor housing by means of screws as fastening elements.

[0033] The method for mounting a sensor unit on an elevator door frame involves inserting the sensor unit into an insertion opening in the door frame. The sensor unit is inserted into the insertion opening in a linear motion such that the sensor unit in the inserted position conforms to the door frame in a form-fitting manner, preventing the sensor unit from twisting or shifting. Removal is only possible in the direction opposite to the insertion direction.

[0034] In the insertion position, in this method, the sensor unit is secured to the door frame by a first retaining element and / or a second retaining element. One or both retaining elements form a further form-fit with the door frame, which also prevents movement in the direction opposite to the insertion direction. Preferably, the form-fit is achieved by a snap-fit ​​as a retaining element. The snap-fit ​​can be released by directly pressing it, allowing the sensor unit to be removed from the insertion opening.

[0035] According to a preferred embodiment, the method is further characterized by the following steps: - Press the sensor unit against the door frame by applying pressure, wherein the pressure causes the sensor unit to move out of the insertion opening.

[0036] For this purpose, the latch can be designed such that sufficient pressure on the sensor module deforms the latch to release the shape-fit connection, allowing the sensor module to be removed from the insertion opening. For this purpose, the sensor module can be accessed or touched from an area behind the door frame (i.e., an area accessible only from the shaft). A service technician can manually press on the sensor unit and push it out of the insertion opening. The pressure required to release the latch is selected to allow the service technician to easily apply the force while securely holding the sensor unit under all operating conditions. A pressure of 5N to 25N is particularly suitable for releasing the sensor module.

[0037] Alternatively, a maintenance technician can use a screwdriver to release the form fit between the first or second clip and the door frame structure to release the sensor unit.

[0038] According to a preferred embodiment, the method further includes the following steps: - The supply cable is connected to the sensor unit by connecting a plug connector between the supply cable and the sensor unit; And especially, - Disconnect the supply cable from the sensor unit by disconnecting the plug connector between the supply cable and the sensor unit.

[0039] The plug connector allows for very quick replacement of the sensor unit. To do this, push out the sensor unit to be replaced and disconnect the plug connector. Reconnect the new sensor unit to the elevator using the same connector and insert it into the insertion opening. The retaining element ensures that the sensor unit is immediately and securely held in place and ready for use. Attached Figure Description

[0040] Other advantages, features and details of the invention can be found in the following description of exemplary embodiments and with reference to the accompanying drawings, in which identical or functionally identical elements have the same reference numerals.

[0041] In the attached diagram:

[0042] Figure 1 An exploded view of the door frame of the elevator system is shown;

[0043] Figure 2 The door frame of the elevator system is shown;

[0044] Figure 3 An isometric view of the complete sensor unit is shown;

[0045] Figure 4 It shows Figure 3 A cross-sectional view of a sensor unit without a sensor module;

[0046] Figure 5 It shows Figure 3 An isometric view of a sensor unit without a sensor module;

[0047] Figure 6 A cross-section of a door frame with sensor units inserted is shown;

[0048] Figure 7 It shows the relationship with Figure 6 Compared to the cross-section of a door frame rotated 90° and incorporating sensor units. Detailed Implementation

[0049] Figure 1 A portion of a door frame 3 with an end face 18 is shown. An insertion opening 20 is formed in the end face 18, designed to accommodate a sensor unit 1. The sensor unit 1 is connected to a supply cable 22 by means of a plug connector 23. The sensor unit 1 is then inserted into the insertion opening 20 and held therein by a retaining element. The sensor unit 1 monitors the doorway 2. For this purpose, the sensor unit 1 emits infrared light into the doorway, which is reflected by the opposing retroreflective door frame cover (…). Figure 1(Not shown in the image) Reflection. The sensor unit detects the light and can detect the presence of an object in the doorway 2 by analyzing the reflected light. The insertion opening 20 is substantially rectangular. The insertion opening is formed in the area of ​​the door frame cover 32. The sensor unit 1, inserted into the insertion opening, forms a flat surface together with the door frame cover 32 and preferably the entire end face 18. As a result, the sensor unit 1 is substantially invisible. The sensor unit is also protected from impacts from goods and kicks from passengers.

[0050] Figure 2 Showing from Figure 1 A door frame 3 forms a doorway 2 through which one can enter or exit the elevator car. The door frame 3 has an end face 18 on either side of the doorway 2. Two sensor units 1 are inserted into the door frame such that the sensor units 1, together with the end face 18, form a flat surface. A supply cable 22 connects the sensor units 1 to a supply unit 30, which supplies power to the sensor units 1 and transmits the measurement results from the sensor units 1 to, for example, an elevator controller.

[0051] The door frame 3 is open at the rear, which is not visible to passengers. The sensor unit 1 can be approached or touched from this rear side. The sensor unit 1 can be released from the door frame 3 by means of pressure 19 and, for example, replaced.

[0052] The door frame is preferably arranged on the car 29. This has the advantage that the sensor unit 1 arranged on the car 29 can be effectively used on all floors of the building. However, the door frame 3 can also be arranged in the same manner as part of the floor doors on the floors of the building, and the doorway to the car can be opened or closed from there.

[0053] Figure 3 , Figure 4 and Figure 5 It shows that it can be done in, for example Figure 1 or Figure 2 Sensor unit 1 is used in this application. Sensor unit 1 has sensor module 4 (shown in dashed lines) for detecting objects in the doorway. Figure 4 and Figure 5 Essentially the same sensor unit 1 is shown, but without the sensor module. For object detection, the sensor module 4 detects radiation. This radiation can be absorbed and / or reflected by the object to be detected. This means that the sensor module 4 can, for example, emit radiation that can then be reflected or absorbed by an object in the doorway. The sensor unit 1 is electrically connected via plug connector 23.

[0054] Sensor module 4 emits light, preferably infrared light, and receives light reflected by a retroreflective surface on the opposite door frame. An object in the doorway interrupts the beam path from the sensor unit to the retroreflective surface and, for some possible beam paths, returns, thereby preventing light from sensor module 4 from being reflected back to sensor module 4. This allows the sensor module to detect objects in the doorway.

[0055] The cover 14 protects the interior of the sensor unit 1, and in particular protects the sensor module 4 from dirt, contact, and damage. The cover 14 is held by a first cover receiving portion 10 and a second cover receiving portion 11. The cover 14 is designed as a flat, planar body. Preferably, the body is cut or stamped from a thin blank. The cover 14 is preferably glued to the two cover receiving portions. The first cover receiving portion is designed as a flat surface and receives the cover.

[0056] The cover 14 is substantially rectangular, i.e., designed in a rectangular shape. The cover 14 is received by a first cover receiving portion 10 along the first side 12 of the rectangle, and by a second cover receiving portion 11 along the second side 13 of the rectangle. The first side 12 and the second side 13 are the two shorter sides of the rectangle. The first side 12 and the second side 13 form opposite sides of the rectangle.

[0057] Sensor housing 5 is used to receive sensor module 4, sensor module 4 in Figure 3 It is semi-transparent and in Figure 4 and Figure 5 (Not shown). The sensor module 4 is aligned such that its surface is arranged adjacent to the cover 14. Furthermore, the sensor housing 5 has a form-fitting profile 15 that matches the sensor module 4 and fixes its position relative to the sensor housing. The form-fitting profile is formed in the shape of two recesses on the sensor housing 5. Since the two recesses together form a 90° angle, the sensor module 4 is fixed to prevent displacement in all directions and to prevent torsion. A fastening device 16 in the form of a screw holds the sensor module 5 to the sensor housing 5. Additionally, the sensor housing has various stops 34 for aligning the sensor unit 1 in the insertion opening. The sensor housing 5 is manufactured as an injection-molded plastic element.

[0058] The sensor unit 1 has a first retaining element 6 designed as a first snap 8 and a second retaining element 7 designed as a second snap 9 to retain the sensor unit 1 in the insertion opening. Snaps 8 and 9 are also made as injection-molded elements. Figure 4 The two clips 8 and 9 are shown in cross-section. Figure 4 Two pins 35 are also shown for properly aligning the cover 14.

[0059] Figure 6and Figure 7 A sensor unit 1 inserted into a door frame 3 is shown. The door frame has a door frame structure 33. The door frame structure 33 is an extruded profile made of aluminum, with a generally rectangular hole milled into the door frame structure to receive the sensor unit. The door frame structure 33 is provided with a door frame cover 32. The door frame essentially includes the door frame structure 33, but may also include the door frame cover 32.

[0060] Figure 6 It shows the relationship with Figure 4 Same cross-section, but now with sensor module 4 and door frame 33.

[0061] Two cover receptacles 10 and 11 are designed to be the surfaces of the sensor receptacle 5. Specifically, the surfaces of the first cover receptacle 10, the second cover receptacle 11, and the sensor module 4 are coplanar and together support the flat cover 14. Two pins 35 align the cover 14 with holes 36. Retaining elements 6 and 7, in the form of snap fasteners 7 and 8, are form-fitted with the door frame structure 33, thereby securely holding the sensor unit 1 in the door frame.

[0062] The outer surfaces of the door frame cover 32 and the cover 14 merge seamlessly and continuously to each other. The stop 34 defines the position of the sensor unit within the door frame structure 35. To remove the sensor unit from the door frame, pressure 19 can be applied to the sensor unit 1 from the rear. This pressure 19 can be applied to the sensor module solely from the shaft, i.e., only by a maintenance personnel.

[0063] Finally, it should be noted that terms such as "having" or "comprising" do not exclude other elements or steps, and terms such as "a" or "an" do not exclude a plural. Furthermore, it should be noted that features or steps described with reference to one embodiment of the above exemplary embodiments may also be used in combination with other features or steps of the other exemplary embodiments described above. Reference numerals in the claims should not be considered limiting.

Claims

1. A door frame for an elevator system (3). in, The door frame (3) has an end face (18). The end face (18) of the door frame (3) has an insertion opening (20), and The door frame (3) also has a sensor unit (1) inserted into the insertion opening (20). The sensor unit (1) has: - Sensor module (4) for detecting objects in doorway (2), wherein the sensor module (4) detects radiation suitable for absorption and / or reflection by the object to be detected. - Sensor housing (5), which is used to receive the sensor module (4). - A first retaining element (6) is mounted or formed on the sensor receiving portion (5), and the first retaining element (6) is adapted to retain the sensor unit (1) inserted into the insertion opening (20) of the door frame (3). - Cover (14), and the cover (14) is transparent to the radiation. Furthermore, the cover (14) and the end face (18) form a flat surface. The first retaining element (6) is characterized by being designed as a snap-fit ​​(8).

2. The door frame (3) according to claim 1, characterized in that, The sensor unit (1) has a first cover receiving portion (10), and The first cover receiving portion (10) has a flat surface and receives the cover (14). The cover (14) is arranged flat on the first cover receiving portion (10).

3. The door frame (3) according to any one of claims 1 or 2, characterized in that, The cover (14) absorbs or reflects visible light and is transparent to infrared light.

4. The door frame (3) according to any one of claims 1 to 3, characterized in that, The cover (14) is designed as a flat part of uniform thickness.

5. The door frame (3) according to any one of claims 1 to 4, characterized in that, The sensor receiving portion (5) has a shape-fitting contour portion (15), wherein the shape-fitting contour portion (15) receives the sensor module (4) in a shape-fitting manner.

6. The door frame (3) according to claim 5, characterized in that, The fastening device (16) fastens the sensor module (4) in the sensor housing (5).

7. The door frame (3) according to any one of claims 1 to 6, characterized in that, The cover (14) of the sensor unit (1) is substantially rectangular, wherein the first cover receiving portion (10) receives the cover (14) along a first side (12) of the rectangle of the cover (14), and the second cover receiving portion (11) receives the cover (14) along a second side (13) of the rectangle of the cover (14), and the first side (12) and the second side (13) are opposite.

8. The door frame (3) according to claims 5 and 7, characterized in that, The sensor module (4) is arranged between the first cover receiving portion (10) and the second cover receiving portion (11).

9. The door frame (3) according to claim 7 or 8, characterized in that, The first cover receiving portion (10) is formed in the first retaining element (6), and The second cover receiving portion (11) is formed in the second retaining element (7).

10. The door frame (3) according to any one of claims 1 to 9, characterized in that, The function of the sensor module (4) is based on the principle of optical measurement.

11. The door frame (3) of the elevator system according to any one of claims 1 to 10, characterized in that, The end face (18) and / or the cover (14) are retroreflective.

12. A method for mounting a sensor unit (1) on a door frame (3) according to any one of claims 1 to 11, comprising the following steps: - Insert the sensor unit (1) into the insertion opening (20) of the door frame (3); - Use the first retaining element (6) and / or the second retaining element (7) to fasten the sensor unit (1) to the door frame (3).

13. The method according to claim 12, further comprising the following step: - The sensor unit (1) is pressed out of the door frame (3) by applying pressure (19), wherein, The pressure (19) causes the sensor unit (1) to move out of the insertion opening (20).

14. The method according to any one of claims 12 or 13, further comprising the step of: - The supply cable (22) is connected to the sensor unit (1) by connecting a plug connector (23) between the supply cable (22) and the sensor unit (1); And especially, - Disconnect the supply cable (22) from the sensor unit (1) by disconnecting the plug connector (23) between the supply cable (22) and the sensor unit (1).

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