Window opening status monitoring device

Abstract

Window fitting (100) for monitoring the opening status of a window sash, wherein the window fitting (100) has at least one mounting surface element (114) for mounting on a sash frame (200) of the window sash, wherein the window fitting (100) can be arranged in a closed state of a mounting state of the sash frame (200) of the window sash on a fixedly mountable window frame (300) between the sash frame (200) and the fixedly mountable window frame (300); wherein the window fitting (100) has a pre-tensionable spring-mounted element (102), wherein the spring-mounted element (102) is pre-tensioned in the closed state of the assembly condition, and wherein the spring-mounted element (102) is relaxed in an open state of the assembly condition; wherein the window fitting (100) has an electronic unit (110) with at least one sensor and a transmitter unit (108), wherein the at least one sensor is configured to detect sensor data regarding a stress state of the spring-mounted element (102), wherein the stress state comprises at least a pre-stressed state and a relaxed state, and wherein the transmitter unit (108) is configured to send a reference to the detected sensor data to a monitoring device.

Description

[0001] The present invention relates to a window fitting for monitoring an opening state of a window sash and a system in which the window fitting is mounted on a sash frame.

[0002] In the context of smart home technology, it is desirable to be able to remotely monitor the opening status of a window or French door. Conventional smart door or window sensors use two-part contact sensors, each consisting of a first part, such as a magnet, on the movable door or window sash and a second part on the fixed door or window frame. Installing the two parts typically requires some skill in correctly positioning the opposing parts to ensure the respective sensor functions properly. Furthermore, the multi-part design can cause space constraints when installing the sensor.

[0003] Another conventional type of smart door or window sensor uses optical means, which depends not only on proper installation but also on the lighting situation. For example, the sensor's monitoring function may be compromised in intense sunlight or at night due to ambient lighting conditions.

[0004] Against this background, the present invention has the object of providing a window fitting for monitoring the opening state of a window sash and a corresponding system, which at least partially overcome the disadvantages of the known door or window sensors and preferably enable an easy-to-install and space-saving solution for monitoring the opening state.

[0005] These and other objects are achieved by a window fitting according to independent claim 1 and by a system for monitoring an opening state of a window sash according to claim 14. Embodiments and further developments of the window fitting and the system are the subject of dependent claims 2 to 13 and dependent claim 15, respectively.

[0006] Accordingly, a window fitting according to the invention for monitoring the opening state of a window sash comprises at least one mounting surface element for mounting on a casement of the window sash. When the casement of the window sash is in the closed state of an assembled state, the window fitting can be arranged on a permanently mountable window frame between the casement and the permanently mountable window frame. The window fitting comprises a pre-tensionable, spring-mounted element. The spring-mounted element is pre-tensioned in the closed state of the assembled state and is released in the open state of the assembled state.

[0007] The window fitting has an electronic unit with at least one sensor and a transmitter unit. The at least one sensor is designed to acquire sensor data regarding a tension state of the spring-mounted element. The tension state includes at least a pre-tensioned state and a relaxed state. The transmitter unit is designed to send an indication of the acquired sensor data to a monitoring device.

[0008] The window fitting according to the invention is a molded part that can be installed in a fitting rebate of a window sash and uses sensor technology to provide feedback on the opening state of a window. The sensor technology particularly comprises a combination of mechanical and electronic components. The opening states of the window are at least closed or open. Preferably, there is at least one further opening state, which corresponds to a tilted window. When the window is tilted, for example, a movable sash frame can be only partially or to a small extent spaced from a fixed window frame (e.g. on an underside of the window), whereas when the window is open, three sides of the sash frame are spaced to a greater extent from the fixed window frame and only one hanging side of the sash frame is anchored to the fixed window frame by means of window hinges.

[0009] The information regarding the window's opening status detected by the at least one sensor can be transmitted via smart home technology to any device (such as a smartphone, tablet, smartwatch, and / or computer) via the transmitting unit. This allows a recipient (e.g., a resident, homeowner, and / or property management company) to be remotely and easily informed of the window's opening status via the device.

[0010] For the purposes of the invention, window fittings are also to be understood as door fittings, for example, for a French window system. A casement can be the casement of a window or a door, and a permanently installed (also: permanently mounted) window frame is also to be understood as a permanently installed door frame for the purposes of the invention.

[0011] The window fitting can be mounted in such a way that it fills an area of ​​a hollow space (e.g. with regard to a distance between the sash frame and the permanently mountable window frame) in the mounted state.

[0012] The window fitting can have a longitudinal extent and a transverse extent, which, in the assembled state, run parallel and transversely to a longitudinal extent of the sash frame, respectively. The longitudinal extent and the transverse extent of the window fitting can be (e.g., much) smaller than the longitudinal extent and the transverse extent of the sash frame, respectively. For example, the longitudinal extent of the window fitting can be between 10 cm and 30 cm, preferably between 15 cm and 25 cm, and particularly preferably between 15 cm and 20 cm. The transverse extent of the window fitting can, for example, be between 1 cm and 3 cm, preferably between 1.5 cm and 2.5 cm. Alternatively or additionally, a transverse extent (and / or a thickness) of the window fitting can be limited by its suitability for accommodating one or more batteries.For example, accommodating two button batteries of type CR 2032 with a diameter of 20 mm and a height of 3.2 mm requires a minimum width of the electronics unit of 2 cm (for example, 2.5 cm width is possible), a minimum thickness of over 3.2 mm (for example, 7.6 mm thickness to allow electrical contact surfaces to the button batteries) and a minimum length of the electronics unit of 4 cm in order to arrange the two button batteries next to each other.

[0013] The pre-tensioning of the spring-loaded element in the closed state can be achieved by mechanical contact between the spring-loaded element and the fixed window frame.

[0014] In a tilted position, the spring-loaded element can be partially relaxed and continue to contact the fixed window frame.

[0015] When opened, the spring-loaded element can be completely relaxed and have no mechanical contact with the fixed window frame.

[0016] The monitoring device can be a device of a smart home system, for example, a smartphone, a smartwatch, or a tablet. In further embodiments, the monitoring device can include an intermediary device, such as a (e.g., Wi-Fi) router.

[0017] The spring-mounted element can be partially relaxed in the tilted state of the assembly state and the at least one sensor can be designed to detect the partially relaxed state as a stress state.

[0018] In one embodiment, the at least one sensor can detect the different stress states, particularly mechanically or electrically. The partially relaxed state can indicate, in particular, that the window is neither completely closed nor completely open. In the case of a tilt window, the detected partially relaxed stress state can, in particular, indicate a tilted window.

[0019] The window fitting (and in particular the spring-mounted element) may have a bore designed to receive a pin lock in the assembled state.

[0020] The pin lock can include a mushroom head pin or a conventional roller pin.

[0021] The drilling saves material during the manufacturing of the window fitting. The window fitting remains particularly lightweight and only slightly increases the weight of the installed sash, thus avoiding mechanical changes when the sash moves compared to the original design. Furthermore, the drilling allows the window fitting to be installed in existing window systems that have pivot locks between the sash and the permanently mounted window sash.

[0022] Alternatively or additionally, the window fitting may have at least one bore designed to receive a fastening element (for example a screw, a plug-in holder and / or a clip) for mounting the window fitting to the sash frame.

[0023] The hole for receiving the fastening element can, for example, be a screw hole.

[0024] The hole for the fastener allows for easy installation. For example, a user (e.g., a resident or homeowner) can easily install the window fitting themselves, even without specialist knowledge.

[0025] The at least one sensor may comprise a strain gauge (SG). The SG may be configured to detect the stress state of the spring-mounted element as a strain. An electrical resistance value of the SG may be assigned to a strain and / or a stress state of the spring-mounted element.

[0026] The strain gauge may include a bimetal.

[0027] The use of a strain gauge enables a particularly space-saving design with sensor technology that can detect not only the closed or open state of the window, but also at least one tilt state. Optionally, vibration states can also be detected using the strain gauge. A vibration state can be characteristic of a "normal" process of closing, opening, or tilting the window. Alternatively or additionally, an "abnormal" vibration state can indicate a fault (for example, if the sash frame is not correctly secured using all hinges and / or pivots and / or the sash frame is exposed to strong winds or other weather or pressure fluctuations) and / or a break-in (for example, in the case of sudden vibrations that are only detected at one window and therefore do not indicate weather-related influences).

[0028] The electronics unit may comprise a battery compartment for a wireless power supply of the at least one sensor and the transmitting unit.

[0029] The battery compartment may have a closure which can be mounted on a main part of the window fitting by means of at least one fastening element (e.g. by means of one or two screws).

[0030] For example, one or more (preferably two) button cells can be inserted into the battery compartment.

[0031] Using batteries (especially button cells), an uninterrupted wireless power supply can be provided for a fixed period of time (e.g. at least one year).

[0032] This allows monitoring of the window's opening status independent of electrical connections near the window. Preferably, the battery charge level can also be transmitted to a receiver.

[0033] Alternatively, the electronic unit can be powered (especially electrically) via a wired connection. This avoids the need to replace batteries after a fixed period of time (e.g., one year).

[0034] The at least one sensor can be designed to detect a temporal change in the stress state (and preferably a characteristic pattern in the temporal change in the stress state) of the spring-mounted element.

[0035] The characteristic patterns (e.g., for opening and closing the window sash) can depend on the dimensions of the window sash, such as the height, width, thickness of an installed window pane (also: window glass, especially with multiple glazing), and / or the weight of the window sash. Alternatively or additionally, the characteristic pattern can depend on the material of the sash frame, for example, plastic or wood.

[0036] The characteristic pattern may include continuous relaxation (particularly when opening the window sash), continuous tension (particularly when closing the window sash) and / or vibrations of the spring-loaded element.

[0037] The characteristic pattern may, for example, have been recorded in a series of experiments (particularly over a predetermined period of time).

[0038] The characteristic pattern can be associated with at least one opening of the sash in the assembled state and one closing of the sash in the assembled state. Optionally, the characteristic pattern can also be associated with wind pressure, a damage state, and / or a break-in state.

[0039] The damage may include the sash not being (or no longer being) properly mounted (also: attached) to the fixed window frame. For example, a hinge may be defective and / or the sash may be hanging crookedly in the fixed window frame.

[0040] In one embodiment, the wind pressure may comprise a characteristic pattern that causes movements of the sash frame due to weather conditions, in particular wind, particularly when the window is open or tilted.

[0041] In one embodiment, the break-in condition may include fluctuations in the stress state of the spring-loaded element occurring that are greater than during a conventional opening or closing of the sash frame.

[0042] Known conditions such as opening, closing, wind pressure, a (common) type of damage, and / or break-in can be determined in a series of tests and thus be known in advance when the window fitting is installed. The series of tests can, for example, have been conducted for different designs (e.g., with regard to height and width and / or weight of the window sash).

[0043] The characteristic pattern can make it possible to recognize and transmit different previously known operating states and / or opening states.

[0044] A temporal change in the stress state that is not known as a characteristic pattern can be classified as a fault.

[0045] The fault may, for example, be caused by a defect in the suspension of the window sash in the permanently mounted window frame and / or due to mechanical influences, such as shaking or prying, during a burglary.

[0046] A temporal change that cannot be classified as a characteristic pattern can therefore be classified as a possible dangerous condition and / or a warning can be issued.

[0047] Based on the detection or non-detection of various characteristic patterns, a recipient (e.g., the resident, homeowner, and / or property management) can decide whether to take action, such as returning home to check the window's opening status or requesting another person to check the opening status. Alternatively or additionally, for electrically opening and / or closing windows, a change in the opening status can be initiated using smart home technology.

[0048] The electronics unit may include a processing unit. The processing unit may be configured to process the sensor data regarding a tension state of the spring-mounted element. The reference to the acquired sensor data may include a movement state or an opening state of the window sash.

[0049] The indication may include an opening state of "open," "closed," and / or "tilted." Alternatively or additionally, the indication may include a movement state of "opening," "closing," "tilting," and / or "tilting closed."

[0050] Alternatively or additionally, an error condition can be output, for example as “defective” and / or “unusual condition”.

[0051] In further embodiments, the processing unit can be arranged outside the window fitting. For example, a sensor signal from the at least one sensor can be evaluated in a (e.g., Wi-Fi) router, a central control device of a smart home system, and / or at the terminal device to indicate the (e.g., most probable) opening state and / or movement state to the receiver.

[0052] The transmitting unit can be designed to wirelessly transmit the reference to the acquired sensor data to a communication device (for example a WLAN router) for forwarding to the monitoring device (in particular the terminal device, such as a smartphone or a smartwatch).

[0053] This allows the window fitting to be integrated into an existing smart home system without the need for cabling.

[0054] In alternative embodiments, the window fitting can be connected to the existing smart home system using at least one cable.

[0055] The sensor data may be recorded (for example as raw data) in the reference to the recorded sensor data.

[0056] Sending the recorded sensor data (especially as raw data) enables a particularly small and / or simple electronic unit for the window fitting. For example, no processing unit is required within the electronic unit. This also allows for energy savings and / or a long battery life (e.g., well over a year).

[0057] The window fitting can be designed for mounting on the sash of a tilt-and-turn window. Preferably, the window fitting can be designed for mounting on the underside of the sash.

[0058] The underside of the sash frame is particularly suitable for detecting the tilt condition, in which the top of the sash frame is usually tilted away from the fixed window frame.

[0059] A system according to the invention for monitoring the opening state of a window sash comprises at least one window fitting according to the invention and a window sash with a sash frame on which the at least one window fitting is mounted. The system further comprises a fixedly mountable window frame on which the sash frame of the window sash is movably mounted, and a monitoring device configured to receive an indication of the sensor data acquired by the at least one window fitting.

[0060] The system may include one or more window fittings on a window sash. For example, one window fitting may be mounted on the underside of the sash frame and another window fitting may be mounted on a vertical side of the sash frame.

[0061] In one embodiment, the movement state and / or the opening state of the window sash can be determined from a combination of sensor data from at least two window fittings. For example, a first window fitting on the underside of the sash frame can provide sensor data indicating a closed, tilted, and / or open state. Another window fitting on a vertical side of the sash frame can provide further sensor data indicating a closed and / or open state in the mounting area of ​​the additional window fitting.

[0062] This allows errors in determining the opening state to be minimized and / or error states, such as a defective suspension of the casement window and / or a break-in state, to be detected more reliably.

[0063] The system may comprise a central processing device. The central processing device may be configured to process the acquired sensor data from the at least one window fitting and, as a result of the processing, to determine a movement state and / or an opening state of the window sash.

[0064] The central processing unit can be located in a smart home system, for example, in a Wi-Fi router or a central control device. Alternatively or additionally, the central processing unit can be cloud-based (for example, in a home cloud).

[0065] The central processing device can in particular be implemented by a unit already present in the smart home system.

[0066] Further features of the invention will become apparent from the following detailed description of embodiments of the invention in conjunction with the drawings and the claims.

[0067] It shows: Fig. 1A, Fig. 1B, Fig. 1C and Fig. 1D shows an embodiment of a window fitting according to the invention for monitoring an opening state of a window sash in a plan view visible in the assembled state, a first side view parallel to a longitudinal extent of the window sash visible in the assembled state, a perspective view and a second side view transverse to a longitudinal extent of the window sash visible in the assembled state; Fig. 2 a cross-section through a casement and through an embodiment of the window fitting according to the invention mounted on an outer side of the casement; and Fig. 3 a perspective cross-sectional view of a sash frame and a permanently mountable window frame in a closed state, in which a cavity is present in which the window fitting according to the invention can be received.

[0068] Fig. 1A, Fig. 1B, Fig. 1C and Fig. 1D show an embodiment of a window fitting 100 in different views.

[0069] In Fig. 1A shows the exemplary window fitting 100 in a top view, which is visible after installation on a casement frame in the open state of a window sash. The window fitting 100 has a pre-tensionable, spring-loaded element 102 in the upper area of ​​the Fig. 1A. In the embodiment of the Fig. 1A, there is a bore 104 in the pre-tensionable, spring-loaded element 102, which can serve to receive a pin lock in the assembled state. Below (or at the end oriented towards the center of the window fitting 100) of the pre-tensionable, spring-loaded element 102, the window fitting 100 in the embodiment of Fig. 1A has a further bore 106 which is suitable for receiving a fastening element (for example a screw, a plug-in holder or a clip) for mounting the window fitting 100 to the sash frame. Opposite (for example along the longitudinal direction of the window fitting 100) the bore 106 for fastening, the exemplary window fitting 100 of Fig. 1A has a transmitting unit 108 which is associated with an electronic unit 110. The electronic unit 110 has Fig. 1A further includes a battery compartment 112, the cover of which can be attached to the window fitting 100 by means of fastening elements (e.g., screws) 116. The cover of the battery compartment 112 and the associated holes for receiving the fastening elements 116 are oriented outward in the assembled state, or away from a glass pane inserted in the sash frame. This allows batteries to be replaced with the sash frame open while the window fitting 100 is in the assembled state.

[0070] Fig. 1B shows the window fitting 100 of the Fig. 1C in a first side view, namely along a long side of the window fitting 100. In the assembled state, the long side is arranged parallel to a longitudinal direction of the sash. Visible in the side view is a mounting surface element 114, which, in the assembled state, points toward the sash and at least partially borders or abuts the sash.

[0071] In Fig. 1C is the window fitting 100 of the Fig. 1A and Fig. 1B shown in perspective view.

[0072] In Fig. 1D shows the window fitting 100 in a second side view. The second side view runs transversely to the sash frame. In the view of the Fig. 1D, the window fitting 100 can be mounted on a sash frame from below by means of at least a part of the mounting surface element 114.

[0073] In Fig. 1A shows an example of a length of the window fitting 100 of 195 mm and a width of the window fitting 100 of 24 mm. In Fig. 1B, Fig. 1C and Fig. 1D shows a thickness of the area of ​​the window fitting 100 where the electronics unit 110 (and in particular the battery compartment 112) is located. Fig. 1D this thickness is given as 7.6 mm as an example.

[0074] Fig. 2 shows an embodiment of the window fitting 100 in an exemplary installation situation on the underside of a sash frame 200. The sash frame 200 shown as an example has a hollow chamber profile with a profile element 202 on the underside of the sash frame 200. The mounting surface element 114 can be attached to the profile element 202 at least piecewise (e.g. as in Fig. 2, at outer regions in the longitudinal direction of the mounting surface element 114). Within the profile element 202, for example, one or more pins of the pin lock can be accommodated. Within the profile element 202, Fig. 2 further accommodates the fastening element (for example the screw, the plug-in holder or the clip) which can be guided through the bore 106 and by means of which the window fitting 100 is fastened to the sash frame 200.

[0075] Fig. 3 shows, by way of example, a closed state of another sash frame 200 with a hollow chamber profile and a permanently mountable window frame 300, which in the exemplary embodiment also has a hollow chamber profile. In Fig. 3, no window fitting 100 is mounted on the sash frame 200. The area 302 shows the cavity below the profile element 202, in which a window fitting 100 can be accommodated during installation.

[0076] The window fitting 100 according to the invention is a small component that is connected to the fitting mechanism of a window in such a way that a spring-loaded element 102, for example a fork-shaped spring-loaded tongue (e.g., as in the ballpoint pen principle), absorbs the movement of the window fitting 100 and transmits the change in position of the window fitting 100 as a signal to one or more end devices (e.g., to a smartphone). The aim is to signal the receiver, in the event of absence, the state of the window sash 200. In one embodiment, the state of the window sash 200 is: open, tilted, closed, and / or burglarized.

[0077] The spring-loaded element 102 is in Fig. 1A, Fig. 1B and Fig. 1C is shown as being arranged, by way of example, on one side (with respect to the longitudinal direction of the window fitting 100) of a region 106 which can be fastened to the sash frame 200 by means of a fastening element.

[0078] The spring-loaded element 102 can be pre-tensioned, for example, when screwed or otherwise fastened to the sash frame 200 via the bore 106, such that it presses against the window frame 300 when the window is closed. When the window is tilted, the spring-loaded element 102 can be partially relaxed, so that it still presses against the window frame 300, but with a lower force than in the closed state. When the window is open, a pressure is applied from the outside (e.g., from below in the assembly example of the Fig. 2) no counterpressure is exerted on the spring-loaded element 102, which is thus relaxed. For example, the spring-loaded element 102 can be seen in the side view of the Fig.1B can be bent to the right by assembly. The greatest deflection to the right occurs when there is no counterpressure from the right. When the window is closed, the window frame 300 presses against the spring-loaded element 102 from the right, so that it lies approximately in a straight line with the electronics unit 110. In the tilted state, the window frame 300 is still so close to the sash frame 200 that a slight counterpressure is exerted on the spring-loaded element 102, so that it is not deflected to the maximum extent to the right.

[0079] A burglary condition can be detected, for example, if unusual vibrations of the spring-loaded element 102 are registered and / or if several spring-loaded elements 102 mounted on the sash frame 200 emit contradictory signals that cannot be consistently assigned to a closed, open or tilted state of the window.

[0080] There are many conventional smart home products that are intended to transmit a status message of a window via various sensors, but none that accurately describe the actual condition of the window sash, as is the case with the window fitting according to the invention that can be mounted on the sash frame.

[0081] The sash-mounted window fitting is a simple solution to the problem of reliably monitoring the window's opening status. This solution works with virtually any window fitting and can be retrofitted in most cases.

[0082] The window fitting according to the invention is a mechanical-electronic component that can transmit the opening status of a window to the user via smart technology, for example, using a smartphone to query the status of a window when the user is absent.

[0083] Further embodiments of the present invention arise from the combination of features described above in connection with different embodiments. Such combinations are therefore expressly deemed to be disclosed and included in the protection. A detailed description of these embodiments is omitted solely in the interest of a concise presentation of the invention, but can be readily supplemented by a person skilled in the art.

Claims

[1] Window fitting (100) for monitoring an opening state of a window sash, wherein the window fitting (100) has at least one mounting surface element (114) for mounting on a casement (200) of the window sash, wherein the window fitting (100) can be arranged on a permanently mountable window frame (300) between the casement (200) and the permanently mountable window frame (300) in a closed state of an assembly state of the casement (200) of the window sash; wherein the window fitting (100) has a pre-tensionable spring-mounted element (102), wherein the spring-mounted element (102) is pre-tensioned in the closed state of the assembly state, and wherein the spring-mounted element (102) is relaxed in an open state of the assembly state; wherein the window fitting (100) has an electronic unit (110) with at least one sensor and a transmitting unit (108), wherein the at least one sensor is designed to detect sensor data regarding a stress state of the spring-mounted element (102), wherein the stress state comprises at least a prestressed state and a relaxed state, and wherein the transmitting unit (108) is designed to send an indication of the detected sensor data to a monitoring device. [2] Window fitting (100) according to claim 1, wherein the spring-mounted element (102) is partially relaxed in a tilted state of the assembly state, and wherein the at least one sensor is further configured to detect a partially relaxed state as a stress state. [3] Window fitting (100) according to claim 1 or 2, wherein the window fitting (100), in particular the spring-mounted element (102), has a bore (104) which is designed to receive a pin lock in the assembled state. [4] Window fitting (100) according to one of claims 1 to 3, wherein the window fitting (100) has at least one bore (106) designed to receive a fastening element, for example a screw, for mounting the window fitting (100) on the sash frame (200). [5] Window fitting (100) according to one of claims 1 to 4, wherein the at least one sensor comprises a strain gauge, DMS, which is designed to detect the stress state of the spring-mounted element as a strain, wherein a value of an electrical resistance of the DMS can be assigned to a strain and / or a stress state of the spring-mounted element. [6] Window fitting (100) according to one of claims 1 to 5, wherein the electronics unit (110) further comprises a battery compartment (112) for a wireless power supply of the at least one sensor and the transmitting unit (108). [7] Window fitting (100) according to one of claims 1 to 6, wherein the at least one sensor is further designed to detect a temporal change in the stress state, preferably a characteristic pattern in the temporal change in the stress state, of the spring-mounted element (102). [8] Window fitting (100) according to claim 7, wherein the characteristic pattern is assignable to at least one opening of the sash frame (200) in the assembled state and one closing of the sash frame (200) in the assembled state, optionally wherein the characteristic pattern is further assignable to a damage state, a wind pressure state and / or a burglary state. [9] Window fitting (100) according to claim 7 or 8, wherein a temporal change in the stress state, which is not known as a characteristic pattern, can be classified as a defect. [10] Window fitting (100) according to one of claims 1 to 9, wherein the electronic unit (110) further comprises a processing unit, wherein the processing unit is designed to process the sensor data with regard to a tension state of the spring-mounted element (102), and wherein the indication of the detected sensor data comprises a movement state or an opening state of the window sash. [11] Window fitting (100) according to one of claims 1 to 10, wherein the transmitting unit (108) is designed to transmit the indication of the acquired sensor data wirelessly to a communication device, for example a WLAN router, for forwarding to the monitoring device. [12] Window fitting (100) according to one of claims 1 to 11, wherein the sensor data, for example as raw data, are recorded in the reference to the recorded sensor data. [13] Window fitting (100) according to one of claims 1 to 12, wherein the window fitting (100) is intended for mounting on a sash frame (200) of a tilt window sash, preferably wherein the window fitting (100) is intended for mounting on the underside of the sash frame (200). [14] System for monitoring an opening state of a window sash, comprising: - at least one window fitting (100) according to one of claims 1 to 13; - a window sash with a sash frame (200) on which the at least one window fitting (100) is mounted; - a fixedly mountable window frame (300) to which the sash frame (200) of the window sash is movably mounted; and - a monitoring device which is designed to receive an indication of the sensor data detected by means of the at least one window fitting (100). [15] System according to claim 14, further comprising a central processing device, wherein the central processing device is designed to process the acquired sensor data from the at least one window fitting (100) and to determine a movement state and / or an opening state of the window sash as a result of the processing.

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