Sensor unit

Abstract

The invention relates to a sensor unit (1) for inserting 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 objects in the doorway (2). A sensor of the sensor module (4) detects radiation which is suitable for being absorbed and / or reflected by an object to be detected. The sensor unit has a sensor receptacle (5) for receiving the sensor module (4). The sensor unit has a first holding element (6), which is mounted or formed on the sensor receptacle (5). The first holding element (6) is suitable for holding the sensor unit (1) inserted into the 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 the radiation. The first cover receptacle (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 in such a way that it is suitable for closing the insertion opening (20) in the door frame (3) flush with respect to the end face (18).

Description

[0001] SENSOR UNIT

[0002] The present invention relates to a door frame of an elevator system and a method for attaching the sensor unit to a door frame.

[0003] In an elevator system, a car is typically moved vertically along a travel path between different floors or levels within a building. The car and the floors have door openings. The door openings can be closed by doors with door leaves. The door leaves of the doors are driven by a drive. When the doors open, a doorway is formed. On the various floors, the car can be entered or exited 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. This monitoring can ensure, for example, that the doors remain open if an object, such as a person or goods, is in the doorway.Furthermore, for example, an initiated door closing process can be aborted if one of the sensor units detects that an object has entered the doorway while the doors are already closing. These objects could collide with the closing doors, causing damage to the doors or the objects themselves. In particular, people could be injured. The sensor units therefore serve to ensure the safety of the system and the safety of the people using it.

[0004] For example, the application US 2021047147 A1 shows such sensor units, which are referred to there as transmitting and receiving units. These are used to monitor a doorway. US 6 631 788 B2 shows a system for monitoring a doorway with spatially separated transmitting and receiving units.

[0005] Sensor units are sensitive. They easily become dirty, for example. Furthermore, the sensor units can be impacted, dented, or shaken by goods during loading or unloading. Furthermore, a sensor unit's mounting bracket can easily become bent, for example. Such influences can impair the functionality of the sensor unit and thus the safety of passengers and the system. A functionally impaired sensor unit should therefore be easily and quickly replaced.

[0006] It can therefore be seen as a task to provide an easily replaceable sensor unit.

[0007] According to a first aspect of the invention, a door frame of an elevator system solves the problem. The door frame has an end face. The end face of the door frame has an insertion opening, and a sensor unit is inserted into the insertion opening. The sensor unit has a sensor module for object detection in the doorway. A sensor of the sensor module detects radiation that is suitable for being absorbed and / or reflected by an object to be detected. The sensor unit further has a sensor receptacle for receiving the sensor module. The sensor unit further has a first holding element that is attached to or formed on the sensor receptacle. The first holding element is suitable for holding the sensor unit when it is inserted into the insertion opening of the door frame. The sensor unit further has a cover. The cover is transparent to the radiation. The cover and the end face form a flat surface.The first holding element is designed as a snap.

[0008] According to a second aspect of the invention, a method for attaching a sensor unit to a door frame according to the first aspect of the invention solves the problem. The method comprises the following steps:

[0009] Inserting the sensor unit into an opening in the door frame, fastening the sensor unit to the door frame using the first holding element and / or the second holding element.

[0010] Possible features and advantages of embodiments of the invention may be considered, among other things and without limiting the invention, to be based on ideas and findings described below.

[0011] The sensor unit is used to detect the object to be detected in the doorway area. The object to be detected is detected by a change in the beam path of a radiation through the object. The radiation can be electromagnetic waves, such as light, particularly infrared light. Other types of electromagnetic radiation, such as microwaves, can also be used. Sound, particularly ultrasound, can also be used as radiation. The radiation can originate from the environment. Alternatively, it can also come from a specially installed radiation source. The specially installed radiation source can be located, for example, on the elevator, in the cabin, on the door frame or, in particular, in the sensor module.

[0012] The radiation is absorbed or reflected by the object. This changes the beam path so that the sensor detects different radiation values ​​when the object is present in the doorway than when it is absent. Evaluation electronics use the detected radiation values ​​to determine the presence or absence of an object in the doorway area.

[0013] According to a preferred embodiment, the sensor module operates based on an optical measuring principle. Optical measuring principles are based on the measurement of light. Examples of such optical measuring 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 passenger noticing the illumination. Alternatively, the sensor unit can be designed for visible light. This has the advantage that ambient light, for example from the cabin lighting or from the floor, can serve as illumination. However, systems such as laser triangulation sensors, in which a laser is integrated as the light source, can also be used.This in turn has the advantage that the laser light is hardly disturbed, as it only covers a very narrow frequency range and can therefore be easily distinguished from the light of other sources.

[0014] The cover, together with the front face of the door frame, forms a flat surface when the sensor unit is inserted into the door frame. This has the advantage that the cover closes the opening in the front face flush. This protects the sensor module well from dirt, and the front face of the door frame is easy to clean.

[0015] According to a preferred embodiment, the cover is designed as a flat piece of uniform thickness. The cover of the sensor unit is cut or punched from a material of uniform thickness. The material is preferably a plastic with a thickness between 0.2 and 4 mm.

[0016] According to a preferred embodiment, the cover absorbs or reflects visible light and is transparent to infrared light. This has the advantage that the cover conceals the interior of the sensor unit from the human eye. The infrared light penetrates the cover and can be used by the sensor module to detect objects in the doorway. In particular, this allows the use of a sensor unit that can both emit infrared light and detect reflected infrared light.

[0017] This camouflages the sensor unit, particularly if the cover is made of the same material, opaque to visible light, as the surface or a coating on the front face of the door frame. For example, a strip of the same material as the cover can be arranged along the front 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 made of the same material, the cover is inconspicuously hidden in the door frame cover. This has the advantage that the sensor unit is not noticed and is therefore less likely to be covered up or soiled by vandals, for example. The door frame cover can be completely interrupted in each case, so that the cover is arranged between two parts of the door frame cover.Alternatively, the door frame cover may have recesses or holes to accommodate a cover.

[0018] The door frame preferably comprises a door frame structure, preferably made of metal, which ensures the strength of the door frame, and a door frame cover, which ensures the optical properties of the front surface. According to a preferred embodiment, the front surface of the door frame and / or the cover is retroreflective. Retroreflective describes the property that a portion of the light striking the retroreflective surface is reflected back in the same direction from which the light strikes the surface.

[0019] Preferably, the material of the cover and / or the end face of the door frame is both partially transparent and partially retroreflective. This means that a first substantial portion of a light beam that strikes the material goes straight through the material and a second substantial portion is retroreflected. The portions of the light that are deflected in all other directions are preferably insignificantly small. This has the advantage that a radiation source of the sensor module emits radiation and can shine through the cover into the doorway. The radiation is then, with no object in the beam path, retro-reflected at the opposite end face of the door frame and thus thrown back onto the sensor unit. The retroreflective material on the two opposite end faces and the cover of the sensor unit or the covers of the sensor units comprise at least partially the same material.This retroreflective material on the end surfaces of the door frame can be referred to as a door frame cover. It can be adhered to the door frame, for example, using adhesive. The cover preferably blends seamlessly into the door frame cover of the end surface and is therefore not visible to a passenger. In such an arrangement, the radiation source is preferably mounted slightly offset from the sensor in the sensor module, so that the radiation retroreflected by the cover upon leaving the sensor unit is only reflected back into the radiation source and not into the sensor. The sensor therefore only receives radiation from outside the sensor unit.

[0020] The sensor module preferably has a light source as a radiation source, which illuminates an end face of the door frame opposite the sensor unit. Visible or infrared light is preferably used for this purpose. This end face has the retroreflective surface and reflects the light back towards the sensor unit. There, the light is detected by a camera, in particular a line scan camera. An object in the beam path at least partially prevents the light from reaching 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 a sensor unit, the retroreflective surface is also continuous across this additional sensor unit.The continuous retroreflective surface allows a sensor unit located opposite this surface to seamlessly monitor the doorway between the sensor unit and the retroreflective surface. Such a gap could occur where a sensor unit without a retroreflective surface would be installed.

[0021] It is possible to mount multiple sensor units on opposite faces of a door frame. The retroreflective cover of one sensor unit allows the radiation from the other sensor units to be reflected back to the respective sensor units even at the location of the cover. Thus, all sensor units have an opposite face with a continuous, uninterrupted, retroreflective surface. The sensor unit can thus seamlessly monitor the area between the sensor unit and this retroreflective surface.

[0022] In addition, the sensor unit in particular is not recognizable as such in the continuous retroreflective surface, and the front surface appears continuous and uniform.

[0023] According to a preferred embodiment, the sensor unit has a first cover receptacle. The first cover receptacle is configured as a flat surface, and the first cover receptacle accommodates the cover. The cover receptacle and the preferably also flat cover touch the cover receptacle and are attached to it. The cover can be glued to the cover receptacle using adhesive or can be welded to the cover receptacle using ultrasonic welding. The cover receptacle is preferably configured on the sensor receptacle.

[0024] According to a preferred embodiment, the cover of the sensor unit is substantially rectangular. The first cover receptacle receives the cover along a first side of the rectangle of the cover, and a second cover receptacle receives the cover along a second side of the rectangle of the cover. The first side is opposite the second side. The cover is thus rectangular and rests on the first and second cover receptacles at each end of the rectangle. The rectangle can, for example, have rounded corners, making the corners of the rectangle more robust and less susceptible to damage.

[0025] To ensure the cover is correctly aligned with the sensor mount during assembly, the sensor unit may have two holes in the cover. These two holes can precisely fit two pins on the sensor mount, ensuring the cover is correctly aligned with the sensor mount.

[0026] According to a preferred embodiment, the sensor module is arranged between the first cover receptacle and the second cover receptacle. Between the first and second cover receptacles, the cover preferably rests on the sensor module. As a result, the width of the sensor unit can essentially correspond to the width of the sensor module. As a result, the width of the door frame can be kept small. Because the first and second cover receptacles are arranged above and below the sensor module, the sensor unit is not significantly wider than a 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. Thus, the width, in particular a minimum width, of the door frame also essentially corresponds to the width of the sensor module.

[0027] One advantage of the sensor unit is that the sensor module can be attached to the door frame quickly and in the correct alignment. The sensor holder holds the sensor module and completely determines the orientation and position of the sensor module relative to the sensor holder. The sensor holder is designed such that, when inserted into the insertion opening, it forms a positive fit with the door frame and thereby determines the orientation and position of the sensor relative to the door frame. The sensor holder is preferably manufactured using an injection molding process. Metal or plastic are suitable materials for production. The sensor unit, which is inserted into the insertion opening, can preferably only be moved essentially perpendicular to the front surface of the door frame. All other directions of displacement or types of twisting are prevented by the positive fit.This movement option is used to insert the sensor unit into the insertion opening or to remove it from it. This mobility is restricted by the first holding element. The first holding element holds the sensor holder, and thus the entire sensor unit, to the door frame. To do this, the holding element engages behind an edge of the door frame. In a first simple embodiment, this can be a bolt, for example, which is moved behind the edge by a rotating movement, for example, and thus secures the sensor unit in the insertion opening. The bolts are retracted for insertion into the insertion opening. Once the sensor unit is correctly positioned, the bolt can be turned using a shaft protruding from the back of the sensor unit or using a screwdriver so that the bolt forms a positive connection with the door frame and in particular with a door frame structure.

[0028] The first retaining element is designed as a snap fastener. The snap fastener engages the door frame in a positive engagement. However, the snap fastener can be deformed so that the positive engagement is released again for removing the sensor unit. The snap fastener is preferably made of the same material and in the same production step as the sensor mount. Preferably, the snap fastener is also manufactured during the injection molding process. Alternatively, the snap fastener can be additionally attached to the sensor mount, for example, as a bent element made of spring steel.

[0029] According to a preferred embodiment, the first cover receptacle is formed in the first holding element, and the second cover receptacle is formed in a second holding element. The integration of the first and second holding elements in the respective cover receptacles is particularly advantageous for production using an injection molding process.

[0030] In particular, both cover receptacles are designed as a separate flat surface of the sensor receptacle.

[0031] According to a preferred embodiment, the sensor holder has a form-fitting contour, which accommodates the sensor module in a form-fitting manner. Such a form-fitting contour can, for example, be formed as a recess in the sensor holder. A part of the sensor module can engage in the recess and thus be held in a form-fitting manner in the form-fitting contour.

[0032] According to a preferred embodiment, a fastening means secures the sensor module in the sensor receptacle. Preferably, the sensor module is further secured to the sensor receptacle by a fastening means. For example, it can be held in the form-fitting contour and to the sensor receptacle by means of a screw as a fastening means.

[0033] The method for attaching a sensor unit to an elevator door frame includes the step of inserting the sensor unit into the insertion opening of the door frame. The sensor unit is inserted into the insertion opening in a straight motion, so that the sensor unit, in the inserted position, interacts positively with the door frame, preventing it from twisting or shifting. Only removal in the opposite direction to the insertion direction remains possible.

[0034] In this inserted position, the sensor unit is secured to the door frame by the first retaining element and / or the second retaining element. The retaining element(s) form a further positive connection with the door frame, which also prevents movement in the opposite direction to the insertion direction. This positive connection is preferably achieved by snap fasteners as retaining elements. To release the snap fasteners, they can be released by pressing directly on them, allowing the sensor unit to be removed from the insertion opening.

[0035] According to a preferred embodiment, the method further comprises the step of: pushing the sensor unit out of the door frame by applying a compressive force, and the compressive force displaces the sensor unit out of the insertion opening.

[0036] For this purpose, the latch can be designed in such a way that a sufficiently strong compressive force on the sensor module deforms the latches to such an extent that the positive locking is canceled, and the sensor module can be pushed out of the insertion opening. The sensor module is accessible from an area behind the door frame, i.e. an area that can only be reached from the shaft. A service technician can press on the sensor unit by hand and thus push it out of the insertion opening. The compressive force at which the latches release is selected so that a service technician can easily apply this force, but that the sensor unit can be held securely in all operating states. A compressive force of 5 N to 25 N is particularly suitable for releasing the sensor module.

[0037] Alternatively, the sensor unit can also be released by the service technician using a screwdriver to push the first snap or the second snap away from the positive connection with the door frame structure.

[0038] According to a preferred embodiment, the method further comprises the steps of: connecting a supply cable to the sensor unit by connecting a plug connection between the supply cable and the sensor unit and in particular

[0039] Disconnect the supply cable from the sensor unit by loosening the plug connection between the supply cable and the sensor unit.

[0040] The plug connection allows for very quick sensor unit replacement. The sensor unit to be replaced is simply pushed out and the plug connection is removed. The new sensor unit is reconnected to the elevator using the same plug and inserted into the slot. The retaining elements immediately hold the sensor unit securely and make it ready for use.

[0041] Further advantages, features and details of the invention will become apparent from the following description of embodiments and from the drawings, in which identical or functionally identical elements are provided with identical reference numerals.

[0042] Showing:

[0043] Fig. 1 is an exploded view of a door frame of an elevator system,

[0044] Fig. 2 a door frame of an elevator system, Fig. 3 an isometric view of a complete sensor unit,

[0045] Fig. 4 a sectional view of the sensor unit of Fig. 3 without sensor module,

[0046] Fig. 5 is an isometric view of the sensor unit of Fig. 3 without sensor module, Fig. 6 is a section through a door frame with inserted sensor unit, Fig. 7 is a section rotated by 90° compared to Fig. 6 through a door frame with inserted sensor unit.

[0047] Fig. 1 shows part of a door frame 3 with an end face 18. In the end face 18, an insertion opening 20 is formed, which is designed to accommodate a sensor unit 1. The sensor unit 1 is connected to a supply cable 22 by means of a plug connection 23. The sensor unit 1 is then inserted into the insertion opening 20 and is held therein by the holding elements. The sensor unit 1 monitors a doorway 2. For this purpose, the sensor unit 1 emits infrared light into the doorway, which is reflected by the opposite retroreflective door frame cover (not shown in Fig. 1). The sensor unit detects this light and, by analyzing the reflected light, can detect whether an object is located in the doorway 2. The insertion opening 20 is essentially 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 front surface 18. This makes the sensor unit 1 essentially invisible. It is also protected from kicks and impacts from the cargo or passengers.

[0048] Fig. 2 shows the door frame 3 from Fig. 1. The door frame 3 defines a doorway 2 through which an elevator car can be entered or exited. On both sides of the doorway 2, the door frame 3 has an end face 18. The two sensor units 1 are inserted into the door frame such that the sensor unit 1, together with the end face 18, forms a flat surface. The supply cables 22 connect the sensor units 1 to a supply unit 30, which, on the one hand, supplies the sensor units 1 with power and, on the other hand, transmits the measurements from the sensor units 1, for example, to an elevator control system.

[0049] The door frame 3 is open on a rear side, which is not visible to passengers. The sensor unit 1 is accessible from this rear side. By applying a pressure force 19, the sensor unit 1 can be released from the door frame 3 and, for example, replaced.

[0050] The door frame is preferably arranged on a cabin 29. This has the advantage that the sensor units 1 arranged on the cabin 29 can be effectively used on all floors of the building. However, the door frame 3 can also be arranged as part of a floor door on a floor of the building, and from there, open or close the doorway into the cabin.

[0051] Figures 3, 4, and 5 show the sensor unit 1 as it could be used, for example, in Fig. 1 or 2. The sensor unit 1 has a sensor module 4 (shown in dashed lines) for object detection in the doorway. Figures 4 and 5 essentially show the same sensor unit 1, but without the sensor module. A sensor of the sensor module 4 detects radiation for object detection. The radiation is suitable for being absorbed and / or reflected by an 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 electrical connection of the sensor unit 1 is made via the plug connection 23.

[0052] The sensor module 4 emits light, preferably infrared light, and receives the light reflected by retroreflective surfaces on the opposite door frame. An object in the doorway interrupts the beam path from the sensor unit to the retroreflective surface and back again for some of the possible beam paths, thereby preventing the light from the sensor module 4 from being reflected back to the sensor module 4. Thus, the sensor module can detect an object in the doorway.

[0053] A cover 14 protects the interior of the sensor unit 1 and in particular the sensor module 4 from dirt, contact, and vandalism. The cover 14 is held by the first cover holder 10 and the second cover holder 11. The cover 14 is designed as a flat, planar body. Preferably, the body is cut or punched out of a thin blank. The cover 14 is preferably glued to the two cover holders. The first cover holder is designed as a flat surface and holds the cover. The cover 14 is essentially rectangular, i.e., in the shape of a rectangle. The cover 14 is held along a first side 12 of the rectangle by the first cover holder 10 and along a second side 13 of the rectangle by the second cover holder 11. 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.

[0054] A sensor holder 5 serves to hold the sensor module 4, which is semi-transparent in Fig. 3 and not shown in Figs. 4 and 5. The sensor module 4 is aligned such that a surface of the sensor module is arranged adjacent to the cover 14. In addition, the sensor holder 5 has a form-fitting contour 15 that mates with the sensor module 4 and secures the position of the sensor module 4 relative to the sensor holder. The form-fitting contour is formed in the form of two grooves on the sensor holder 5. Since the two grooves together form an angle of 90°, the sensor module 4 is secured against displacement in all directions and against twisting. The fastening means 16 in the form of a screw holds the sensor module 5 firmly to the sensor holder 5. In addition, the sensor holder has various stops 34 that serve to align the sensor unit 1 in the insertion opening. The sensor holder 5 is made as an injection-molded plastic element.

[0055] The sensor unit 1 has a first retaining element 6, designed as a first snap-in latch 8, and a second retaining element 7, designed as a second snap-in latch 9, to hold the sensor unit 1 in the insertion opening. The snap-in latches 8 and 9 are also injection-molded elements. Figure 4 shows the two snap-in latches 8 and 9 in section. Figure 4 also shows the two pins 35, which serve to correctly align the cover 14.

[0056] Figures 6 and 7 show the sensor unit 1 inserted into a door frame 3. The door frame has a door frame structure 33. The door frame structure 33 is an extruded aluminum profile in which a substantially rectangular hole is milled to accommodate the sensor unit. The door frame structure 33 is provided with a door frame cover 32. The door frame essentially comprises the door frame structure 33, but can also include the door frame cover 32. Figure 6 shows the same section as Fig. 4 but now with the sensor module 4 and the

[0057] Door frame 33.

[0058] Both cover receptacles 10, 11 are designed as a surface of the sensor receptacle 5. In particular, the first cover receptacle 10, the second cover receptacle 11, and a surface of the sensor module 4 are coplanar and jointly support the flat cover 14. The two pins 35 align the cover 14 via the holes 36. The retaining elements 6 and 7 in the form of the catches 7 and 8 have formed a positive fit with the door frame structure 33 and thus hold the sensor unit 1 firmly in the door frame.

[0059] The outer surfaces of the door frame cover 32 and the cover 14 merge seamlessly and continuously. The stops 34 determine the position of the sensor unit within the door frame structure 35. To remove the sensor unit from the door frame, a compressive force 19 can be exerted on the sensor unit 1 from behind. This compressive force 19 can only be exerted on the sensor module from the shaft, i.e., only by service personnel.

[0060] Finally, it should be noted that terms such as "having," "comprising," etc., do not exclude other elements or steps, and terms such as "a" or "an" do not exclude a plurality. Furthermore, it should be noted that features or steps described with reference to one of the above embodiments may also be used in combination with other features or steps of other embodiments described above. Reference signs in the claims are not to be considered as limitations.

Claims

Patent claims 1. Door frame (3) of an elevator system, wherein 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) further has a sensor unit (1) which is inserted into the insertion opening (20), the sensor unit (1), comprising: - a sensor module (4) for object detection in the doorway (2), wherein a sensor of the Sensor module (4) detects radiation which is suitable to be absorbed and / or reflected by an object to be detected, - a sensor holder (5) for holding the sensor module (4), - a first holding element (6) which is attached to or formed on the sensor holder (5), and the first holding element (6) is suitable for holding the sensor unit (1) inserted into the insertion opening (20) of the door frame (3), - a cover (14), and the cover (14) is transparent to the radiation, and that the cover (14) and the end face (18) form a flat surface, characterized in that the first holding element (6) is designed as a snap (8).

2. Door frame (3) according to claim 1, characterized in that the sensor unit (1) has a first cover holder (10), and the first cover holder (10) is designed as a flat surface and receives the cover (14), the cover (14) is arranged flat on the first cover holder (10).

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

4. Door frame (3) according to one of claims 1 to 3, characterized in that the cover (14) is designed as a flat piece of uniform thickness.

5. Door frame (3) according to one of claims 1 to 4, characterized in that the sensor holder (5) has a form-fitting contour (15), wherein the form-fitting contour (15) positively supports the sensor module (4).

6. Door frame (3) according to claim 5, characterized in that a fastening means (16) fastens the sensor module (4) in the sensor holder (5).

7. Door frame (3) according to one of claims 1 to 6, characterized in that the cover (14) of the sensor unit (1) is designed to be substantially rectangular, wherein the first cover receptacle (10) receives the cover (14) along a first side (12) of the rectangle of the cover (14), and a second cover receptacle (11) receives the cover (14) along a second side (13) of the rectangle of the cover (14), and the first side (12) is opposite the second side (13).

8. Door frame (3) according to claim 5 and 7, characterized in that the sensor module (4) is arranged between the first cover holder (10) and the second cover holder (11).

9. Door frame (3) according to claim 7 or 8, characterized in that the first cover receptacle (10) is formed in the first holding element (6) and the second cover receptacle (11) is formed in a second holding element (7).

10. Door frame (3) according to one of claims 1 to 9, characterized in that the functioning of the sensor module (4) is based on an optical measuring principle.

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

12. A method for attaching a sensor unit (1) to a door frame (3) according to one of claims 1 to 11, comprising the steps: Inserting the sensor unit (1) into a slot (20) of the door frame (3) Attach the sensor unit (1) to the door frame (3) using the first Holding element (6) and / or the second holding element (7).

13. The method according to claim 12, further comprising the step: Pressing the sensor unit (1) out of the door frame (3) by applying a pressure force (19), and the pressure force (19) moves the sensor unit (1) out of the insertion opening (20).

14. The method according to any one of claims 12 or 13, further comprising the step: Connecting a supply cable (22) to the sensor unit (1) by connecting a plug connection (23) between the supply cable (22) and the sensor unit (1) and in particular Disconnecting the supply cable (22) from the sensor unit (1) by disconnecting the plug connection (23) between the supply cable (22) and the sensor unit (1).

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