Monitoring system comprising a door closer

Abstract

The invention relates to a monitoring system (100) comprising a door closer (1) for closing a door (200), with a housing (2) and an output shaft (3) mounted therein, designed for attaching a lever arrangement (103), with a mechanical energy storage device (4) in the housing (2) which acts the output shaft (3) to rotate in a closing direction (12), wherein the energy storage device (4) is preferably designed as a spring, wherein the output shaft (3) is rotatable into a first angular range (8) usable for opening and closing the door (200) and into a second angular range (9), with a sensor unit (20) for detecting an actual rotation angle (11) which depends on the rotation angle of the output shaft (3), and an evaluation unit (101), wherein the evaluation unit (101) is designed to generate a message when the actual rotation angle (11) lies in the second angular range (9).

Description

[0001] The present invention relates to a monitoring system comprising a door closer for closing a door.

[0002] EP 3 315 704 A1 discloses a system for monitoring safety-relevant functions of a door closer. Using a combination of position and acceleration signals, the system checks whether the door closer has been broken or tampered with. For example, it can detect whether a lever connected to the output shaft of the door closer has been disengaged.

[0003] US 2007 / 214725 A1, US 2021 / 164279 A1, US 4 721 946 A and the pre-published document EP 4 368 803 A1 also reveal a surveillance system.

[0004] The object of the present invention is to provide a monitoring system that enables the safe use of a door with a door closer using simple means – in particular, simple manufacturing and low-maintenance operation. Specifically, the monitoring system is intended to detect whether there is a breakage or tampering with the door closer or the lever assembly. Furthermore, a method for operating the monitoring system is to be provided.

[0005] The problem is solved by the features of the independent claims. The dependent claims relate to preferred embodiments of the invention.

[0006] The invention relates to a monitoring system. The monitoring system comprises a door closer for closing a door and an evaluation unit.

[0007] The door closer has a housing. The housing is made of metal, preferably cast. An output shaft of the door closer is rotatably mounted within the housing. The output shaft is rotatable about an axis of rotation.

[0008] The output shaft is designed for attaching a lever assembly. According to a first mounting variant, the door closer can be mounted on the door, i.e., on the door leaf. The lever assembly then forms the connection to the wall. For example, a guide rail of the lever assembly is attached to the wall. In the context of the present invention, the term "wall" also includes the door frame. According to a second mounting variant, the door closer can be mounted on the wall. The lever assembly then forms the connection from the door closer to the door, i.e., to the door leaf. For example, the guide rail of the lever assembly is attached to the door, i.e., to the door leaf.

[0009] The door closer includes a mechanical energy storage device. This mechanical energy storage device is preferably designed as a spring, and preferably as a coil spring. The mechanical energy storage device is located within the housing and applies force to the output shaft, causing it to rotate in the closing direction. As will be described in detail below, a transmission unit can be located between the energy storage device and the output shaft to convert the movement of the output shaft and the movement of the energy storage device, specifically to convert the movement of the energy storage device into a movement of the output shaft.

[0010] The output shaft rotates in the "closing direction," specifically when the door closer is properly installed to close a door and the door is closing. When the door is opened, the output shaft rotates in the opposite direction, also known as the opening direction.

[0011] The door closer is preferably designed without a drive mechanism, so that it is in particular not a motor-driven door drive.

[0012] The door closer may be designed to include hydraulic oil to dampen the closing movement.

[0013] Within the scope of the present invention, it is defined that the output shaft for opening and closing the door rotates within a first angular range. This first angular range is to be distinguished from a second angular range. The output shaft is rotatable into the second angular range. However, the second angular range is not occupied by the output shaft as long as the door closer is properly installed on the door and in operation. If the door closer is not installed, the output shaft rotates, in particular, into the second angular range, since the energy storage is thereby discharged as far as possible.

[0014] During installation of the door closer, the lever assembly is mounted to the output shaft, and the lever assembly rotates the output shaft into the first angular range. Once the door closer is installed, the lever assembly is always connected to the output shaft on one side and to the wall or door on the other. This limits the output shaft's rotation to the boundary between the first and second angular ranges. The output shaft does not rotate into the second angular range.

[0015] This means, in particular, that the boundary between the first and second angular ranges represents a "closed position" of the output shaft. In this closed position of the output shaft, the corresponding door is closed. The angle for the closed position of the output shaft is referred to as the "closing rotation angle".

[0016] If damage occurs to the door closer or the lever assembly, or if, for example, the lever assembly is manipulated, in particular if the lever assembly is released, the output shaft rotates from the first angular range into the second angular range.

[0017] The door closer further comprises a sensor unit designed and arranged to detect the actual rotation angle. This actual rotation angle depends on the rotation angle of the output shaft. Preferably, the actual rotation angle is the rotation angle of the output shaft.

[0018] The monitoring system includes the evaluation unit. As will be described in detail later, this evaluation unit does not have to be located in the door closer, but can also be located at any other location. The evaluation unit is preferably electronic. The evaluation unit preferably includes an electronic processor and / or an electronic memory.

[0019] The evaluation unit is configured to receive the actual rotation angle from the sensor unit. One or more limit values ​​are stored in the evaluation unit, characterizing the second angle range. The evaluation unit is configured to compare the received actual rotation angle with the limit value(s) stored in the evaluation unit for the second angle range. At least one limit value can be permanently preset in the electronic memory during operation. At least one limit value can be permanently preset before installation. Alternatively, at least one limit value can be set during installation. At least one limit value can be determined through a learning process, particularly after installation.

[0020] The evaluation unit is designed to generate a message when the actual rotation angle is in the second angle range; therefore, the generation of the message depends on whether the actual rotation angle is in the second angle range or not.

[0021] The message is, for example, a signal generated by the evaluation unit and used internally, such as to issue a warning, and / or which the evaluation unit transmits to another unit. Based on the message generated in the evaluation unit, it can be concluded that the damage or tampering described above has occurred. This, in turn, suggests that the door may not be properly closed by the door closer, which is particularly relevant for fire doors.

[0022] The evaluation unit stores information such as the closing angle, thus defining the boundary between the first and second angle ranges. This allows the closing angle to correspond to a limit value. This closing angle can be a fixed value stored in the evaluation unit or a value that changes depending on the door closer's installation. Furthermore, it is also possible to define the closing angle in the evaluation unit through a learning process after the door closer is installed.

[0023] Preferably, the door closer comprises a mounting plate, and the door closer housing is attached to the mounting plate. The mounting plate preferably includes fastening elements, particularly designed as holes, for screwing the mounting plate to the door or wall and for attaching the housing and any other components to the mounting plate.

[0024] Preferably, the door closer includes a cover. The cover at least covers the housing of the door closer. The cover is preferably attached to the mounting plate.

[0025] Preferably, the cladding has two opposing end walls. The end walls are preferably connected to each other via two opposing side walls. In particular, it is provided that the two end walls and the two side walls together form the basic body of the cladding. This basic body of the cladding is preferably closable by means of a removable cover.

[0026] Preferably, the door closer is designed to rotate the output shaft into the second angular range as soon as a connection – in particular the lever assembly – between the output shaft and the door or between the output shaft and the wall is released. It is particularly important to consider that the lever assembly connects the output shaft to the door if the door closer is mounted on the wall, or that the lever assembly connects the output shaft to the wall if the door closer is mounted on the door.

[0027] Furthermore, it is preferably provided that the output shaft, in its closed position (i.e., when the door is closed), is energized by the energy storage device to rotate, particularly in the closing direction. This means, in particular, that the output shaft remains energized by the energy storage device even in its closed position, and that the energy storage device is not completely discharged. This ensures, in particular, that the energy storage device can still rotate the output shaft from the closed position into the second angular range.

[0028] When the output shaft rotates in the closing direction, the preload of the energy storage device, or the energy stored in the energy storage device, decreases. It is specifically designed that a minimum preload in the energy storage device is present not in the closed position, but only in the second angular range. A minimum preload also includes the absence of any preload.

[0029] Preferably, the output shaft is rotatable in the opening direction for charging the energy storage device when the door is opened. This opening of the door is achieved in particular by manual operation of the door, especially by a user.

[0030] Preferably, the sensor unit comprises a sensor and an encoder. The encoder is preferably arranged or formed on the output shaft. The encoder is preferably a separate component that is arranged, and in particular attached, to the output shaft. Alternatively, the output shaft can also be designed in such a way that it functions as the encoder.

[0031] The sensor of the sensor unit is designed for detecting the encoder, particularly without contact. The sensor is preferably designed to detect the position, rotation, and / or acceleration of the encoder. In particular, the combination of sensor and encoder enables the actual rotation angle of the output shaft to be detected.

[0032] The arrangement of the sensor, either directly or indirectly, with only one sensor attachment on the output shaft, has the advantage that the sensor, and thus the entire sensor assembly, can be added to existing door closers. For such existing door closers, the necessary approvals usually already exist, so that adding the sensor unit requires no or only minor modifications to the approval. This is primarily because the relatively small sensor does not affect the mechanics within the door closer, and therefore the fundamental function of the door closer—namely, to close the door securely—is not affected by the sensor unit.

[0033] Preferably, the transmitter includes a permanent magnet and the sensor is a magnetic sensor, in particular a Hall sensor.

[0034] Preferably, the permanent magnet is configured such that the north pole forms one end of the permanent magnet and the south pole the other end. When the sensor rotates, the north and south poles thus change their position in space. For example, the permanent magnet is circular, with the north and south poles each forming one half of the permanent magnet.

[0035] The sensor is preferably attached to the end face of the output shaft. It is particularly preferred that the sensor is positively and / or frictionally attached to the output shaft, especially by screws. It is particularly preferred that the output shaft has a mounting receptacle on at least one side, and especially on both sides. This mounting receptacle is, in particular, a bore coaxial with the axis of rotation of the output shaft. The mounting receptacle particularly preferably has an internal thread.

[0036] A sensor mounting is preferably inserted into the mounting receptacle, in particular screwed in. The sensor mounting has a mounting head. The sensor is preferably attached to the mounting head, in particular glued on.

[0037] In a preferred embodiment, the mounting head has a positive locking element that ensures the precise positioning of the sensor. Furthermore, it is preferred that the mounting head has a rim that surrounds the sensor, so that the rim also ensures precise positioning of the sensor on the mounting head.

[0038] The sensor mounting is preferably made of plastic.

[0039] The axis of rotation of the output shaft preferably intersects the sensor and / or the encoder. This ensures that the sensor and encoder are positioned as close as possible to the axis of rotation, enabling precise measurement of the actual rotation angle in a very confined space.

[0040] Particularly preferably, the sensor is arranged symmetrically to the axis of rotation, such that the axis of rotation intersects the sensor, particularly at its center. Furthermore, it is preferably provided that the encoder is arranged symmetrically to the axis of rotation, such that the axis of rotation intersects the center of the encoder, particularly a dividing line between the north and south poles.

[0041] The output shaft is preferably exposed on two opposite sides of the housing and serves for the optional attachment of the lever assembly to either side. It is provided that the lever assembly can be attached to both sides of the output shaft, but – as described by the term "optional" – is actually attached to only one of the two sides.

[0042] In particular, the output shaft has a polygon, especially a square one, on each of the two opposite, exposed sides for attaching the lever assembly.

[0043] The described monitoring system preferably includes the lever assembly. The lever assembly can also be considered part of the door closer. The lever assembly is attached to one side of the output shaft, and the sensor is attached to the other side. This allows the side of the output shaft not used for the lever assembly to be used for the sensor assembly.

[0044] The lever arrangement preferably comprises a slide rail and a lever, wherein one end of the lever is guided in the slide rail and the other end of the lever can be attached to the output shaft.

[0045] Alternatively, preferably, the lever arrangement comprises a linkage, wherein the linkage has rods rotatably connected to one another. One end of the linkage can be attached to the output shaft. The other end of the linkage can be rotatably attached to the wall if the door closer is mounted on the door, or rotatably attached to the door if the door closer is mounted on the wall.

[0046] As described, the encoder is preferably located on the output shaft and rotates with it. In contrast, the sensor is stationary, but is preferably located in close proximity to the encoder, particularly at the end face of the output shaft.

[0047] Preferably, the sensor is arranged on a sensor mounting assembly. The sensor mounting assembly preferably positions the sensor at the end face of the output shaft.

[0048] The sensor mounting arrangement preferably includes a holder. The holder is preferably a single piece. Preferably, the holder is made of plastic.

[0049] Preferably, the sensor mounting arrangement comprises a sensor circuit board. The sensor is arranged on the sensor circuit board, and the sensor circuit board is preferably attached to the mounting bracket.

[0050] Preferably, the sensor mounting assembly, in particular the holder, is attached to the mounting plate, especially by screws. This makes it possible to position the sensor relatively securely and with high accuracy.

[0051] Additionally or alternatively, the sensor mounting assembly can be attached to and / or resting on the housing of the door closer. Attachment relative to the housing allows for particularly precise positioning of the sensor relative to the encoder located on the output shaft.

[0052] The bracket preferably has a bracket extension. This extends around the output shaft, so that the output shaft projects into the bracket extension.

[0053] Preferably, the mounting extension is supported axially on the inside against the housing. This ensures that the mounting rests against the housing.

[0054] Preferably, the mounting extension clamps radially on the outside of an inner surface of the housing, thereby attaching the mounting to the housing.

[0055] Additionally or alternatively, the sensor mounting assembly can be mounted on the inside of the fairing. Preferably, the mount is clamped between the fairing and the housing. This provides another way to position the sensor mounting assembly, and thus the sensor, precisely and with minimal play.

[0056] Preferably, the sensor mounting arrangement comprises at least one retaining spring, in particular as an integral part of the holder, to preload the clamped holder.

[0057] The cover preferably includes at least one mounting receptacle for the bracket. Preferably, the cover includes mounting tabs, the mounting tabs being recessed on the mounting receptacle for inserting the bracket. The cover can be attached to the mounting plate by means of these mounting tabs, in particular by screwing it on.

[0058] Preferably, the mounting receptacle is formed twice on the inside of one of the two side walls of the casing. This double design of the mounting receptacle is particularly useful when the housing is switched between a left-hand and a right-hand arrangement, as will be explained in more detail later.

[0059] As mentioned previously, the evaluation unit is specifically designed to forward the generated message to an external unit. This unit can be a building control unit, a cloud service, a server, an end device, or a mobile device. An end device could be, for example, a computer, while a mobile device could be, for example, a smartphone or tablet.

[0060] By forwarding the message from the evaluation unit to the external unit, a corresponding warning can be generated in the unit in any desired way. For example, a message can be displayed on the mobile device indicating that a specific door closer has been damaged or tampered with.

[0061] According to an optional first variant, the evaluation unit generating the message is arranged as an internal evaluation unit in the door area, specifically in the door closer. The term "in the door closer" means, in particular, that the evaluation unit is located below the door closer's cover. Alternatively, the evaluation unit can also be located next to the door closer, for example, in the door area.

[0062] According to an optional second variant, the evaluation unit generating the message is provided for as an external evaluation unit, whereby the door closer is designed to send the actual rotation angle or a value derived therefrom to the external evaluation unit - in particular by means of a data transmission unit, which is described below.

[0063] According to the invention, the door closer comprises a module. The module has at least one battery and preferably a data transmission unit.

[0064] Preferably, the door closer is designed without a connection to an external electrical power supply.

[0065] Preferably, the sensor and / or the evaluation unit is / are connected to the module for data and / or power transmission.

[0066] The at least one battery is designed to power the sensor unit and preferably also the data transmission unit. It is particularly preferred that the data transmission unit is configured to transmit the battery status of the at least one battery, for example, its charge level. For example, the battery status can be transmitted to the external unit and / or to the external evaluation unit.

[0067] If the evaluation unit is designed as an internal evaluation unit, at least one battery is preferably provided to power the evaluation unit.

[0068] The data transmission unit is preferably designed for wireless data transmission. If it is an external evaluation unit, the data transmission unit can send the actual rotation angle or a value derived from it to the external evaluation unit. If it is an internal evaluation unit, the generated message can be sent via the transmission unit to the external unit, such as the server or the end device.

[0069] As mentioned, the door closer can include a cover that conceals the door closer housing. In particular, the module is located, preferably entirely, beneath the cover. Most preferably, the module is attached to the inside of the cover.

[0070] Preferably, the module can be attached to one of the end walls of the cladding, and more preferably optionally to both end walls of the cladding.

[0071] The module can preferably be positioned on either side of the casing, due to the option of left- or right-hand orientation of the housing. Therefore, a module mounting point for securing the module is preferably located on both end walls of the casing.

[0072] Additionally or alternatively, the module can preferably be attached to the mounting plate. Preferably, the module can be attached to two opposite sides of the mounting plate.

[0073] Preferably, the module can be detached from the casing and / or mounting plate without damage, especially for battery replacement, preferably without tools.

[0074] The module comprises a module circuit board. The module is attached by means of this module circuit board. In particular, the module circuit board is attached to the housing, preferably the module mounting.

[0075] The module preferably comprises a housing assembly. This housing assembly is attached to the module's circuit board. The housing assembly is preferably designed to accommodate at least one battery.

[0076] Preferably, the module is mounted at a distance from the mounting plate. This distance can prove advantageous in the event of a fire if the mounting plate is heated via the door, as the distance prevents direct heat transfer to the module and thus to the batteries. In particular, the distance is chosen to keep at least one battery at least 5 mm away from the mounting plate.

[0077] The housing has a first end face which, when the door closer is installed, faces a hinge of the door. Furthermore, a second end face of the housing is defined, opposite the first end face. Accordingly, the second end face faces a main closing edge of the door. The module is preferably arranged next to the second end face of the housing.

[0078] Preferably, the mounting plate, the housing, and the module are designed so that the housing can be attached to the mounting plate from either the left or right side without rotating the mounting plate. In the left-hand configuration, the door hinges are to the left of the door closer; in the right-hand configuration, the door hinges are to the right of the door closer. In both cases, the first end face must face the hinges.

[0079] With the housing mounted on the left, the module is located to the right of the housing, above the mounting plate. With the housing mounted on the right, the module is located to the left of the housing, above the mounting plate. In both configurations, the module is completely above the mounting plate and therefore does not protrude laterally beyond it.

[0080] In particular, the mounting plate and the housing are designed so that the housing can be attached to the mounting plate in a left-hand orientation and in a right-hand orientation rotated by 180°.

[0081] As previously mentioned, the door closer can include a transmission unit located within the door closer housing, designed to transmit motion between the output shaft and the energy storage device. Specifically, the transmission unit is designed to transmit power reciprocally between the rotary motion of the output shaft and the linear motion of the energy storage device.

[0082] The transmission unit preferably has a cam that rotates with the output shaft. The cam is located, in particular, on the output shaft and can be an integral part of the output shaft.

[0083] The cam is particularly heart-shaped and thus has two convex flanks that converge in a depression.

[0084] The transmission unit preferably comprises a closing piston that is guided by rolling or sliding action on the cam. In particular, a closing piston roller is located on the closing piston, which rolls on the cam. The closing piston is guided in the housing so as to be linearly movable. The closing piston is actuated by the energy storage device. When the closing piston moves in one direction, it charges the energy storage device. When the energy storage device is discharged, the closing piston is pushed in the opposite direction by the energy storage device.

[0085] The closing piston is preferably guided on a flank of the cam. The flank extends into a recess in the cam, with the closing piston, particularly its closing piston roller, bearing against the flank and not the recess when the output shaft is in the closed position. The closing piston moves along the flank towards the recess as the actual rotation angle moves into the second rotation angle range.

[0086] It may be provided that the closing piston is located in the recess when the actual rotation angle is within the second rotation angle range.

[0087] The housing can be defined as two halves, with the first half corresponding to the first end face and the second half corresponding to the second end face. The output shaft is located in the first half and thus closer to the first end face than to the second end face. The energy storage device is preferably located at least partially in the second half and thus closer to the second end face than to the first. Therefore, the energy storage device is positioned between the output shaft and the second end face.

[0088] The invention further comprises a method for operating a monitoring system, in particular the monitoring system described above. The advantageous embodiments described for the monitoring system, as well as the dependent claims pertaining to the monitoring system, are advantageously applied within the scope of the method.

[0089] The procedure involves measuring the actual rotation angle, which depends on the rotation angle of the door closer's output shaft. As described, the output shaft serves to attach the lever assembly. The door closer's mechanical energy storage device imparts rotation to the output shaft in the closing direction. The output shaft can rotate into a first angular range, usable for opening and closing the door, and a second angular range.

[0090] A message is generated if the actual rotation angle falls within the second angle range. A limit value, specifically the closing rotation angle, separates the first angle range from the second. The message is therefore generated when the limit value is undershot.

[0091] The closing rotation angle specifically represents a closed position of the output shaft and thus a closed position of the door. The signal is generated primarily by the evaluation unit described.

[0092] Preferably, the method includes monitoring the door closing time using the evaluation unit. This can be achieved, for example, by recording how long the actual rotation angle changes in the closing direction until the closing angle is finally reached. If the recorded door closing time deviates from one or more limit values, a corresponding message is preferably issued. Based on this message, maintenance of the door closer can be considered, for example, if the door closing time is too short or too long.

[0093] Furthermore, it is preferred that the duration of the door's opening be monitored. This can also be achieved by regularly checking the actual opening angle. A corresponding message is generated, particularly by the evaluation unit, if the door remains open for longer than a predefined period. For example, the evaluation unit's memory can store a maximum permissible opening time. The evaluation unit has a timer to measure this duration. If the actual opening angle exceeds the predefined time within the first range above the closing angle, a message is generated.

[0094] Furthermore, it is preferred that status messages be generated regularly. With an internal evaluation unit, these status messages can be generated within the door closer and sent to the external unit via the data transmission unit. With an external evaluation unit, the status messages can also be generated within the door closer and transmitted to the external evaluation unit via the data transmission unit. The regular transmission of the actual rotation angle or a value dependent on it can also be considered a status message. The external unit, for example, the server or mobile device, preferably generates a warning if the status message is missing, faulty, and / or contains an error message.

[0095] Furthermore, it is preferably provided that an all-clear message is generated when the actual rotation angle, after being detected in the second rotation angle range, returns to the first rotation angle range. Additionally or alternatively, the all-clear message can be generated when a person acknowledges a corresponding warning, for example, at the described external unit or at the door by operating a control element.

[0096] The invention will now be described in more detail using an exemplary embodiment. The following are shown: Fig. 1 a schematic representation of a monitoring system according to the invention with an external evaluation unit and door closer according to an embodiment, Fig. 1a a schematic representation of a variant of the monitoring system according to the invention with an internal evaluation unit in the door closer according to the embodiment, Fig. 2 a perspective view of the door closer of the monitoring system according to the invention according to the embodiment, Fig. 3 an exploded view of the door closer of the monitoring system according to the invention according to the embodiment, Fig. 4 components inside a housing of the door closer of the monitoring system according to the invention according to the embodiment, Fig. 5 a schematic sectional view of a detail of the door closer of the monitoring system according to the invention according to the embodiment, Fig.6 a perspective view of the door closer without cladding of the monitoring system according to the embodiment shown in Fig. 7. Fig. 2 section AA, Fig. 8, a detail from Fig. 7 Fig. 9 an end face of an output shaft of the door closer of the monitoring system according to the inventive embodiment, Fig. 10 a sensor receiving device of the door closer of the monitoring system according to the inventive embodiment, Fig. 11 a detail of the cover of the door closer of the monitoring system according to the inventive embodiment, Fig. 12 a variant of the sensor receiving device of the door closer of the monitoring system according to the inventive embodiment, Fig. 13 a perspective view of the door closer with open cover of the monitoring system according to the inventive embodiment, Fig. 14 a sectional view of a module in the door closer of the monitoring system according to the inventive embodiment, Fig. 15 a perspective view of the module of the door closer of the monitoring system according to the inventive embodiment.16 a variant for the design of the module of the door closer of the monitoring system according to the invention according to the exemplary embodiment, Fig. 17 a sectional view of the variant of the module made of . Fig. 16 Fig. 18 shows a variant for attaching the module of the door closer of the monitoring system according to the invention in the exemplary embodiment, Fig. 19 shows different representations of the left-side and right-side arrangement of the housing of the door closer of the monitoring system according to the invention in the exemplary embodiment, wherein different components are hidden for the sake of clarity, and Fig. 20 shows a method according to the invention.

[0097] The following will be based on the Fig. 1 bis 19 A monitoring system 100 with door closer 1 is described.

[0098] According to Fig. 1 The monitoring system 100 includes an evaluation unit 101. Fig. 1 The evaluation unit 101 is located outside the door closer 1 as an external evaluation unit 101. Alternatively, the evaluation unit 101 can be used as an internal evaluation unit 101 - according to Fig. 1a - also be part of the door closer 1.

[0099] Furthermore, the monitoring system 100 includes an external unit 102, for example, a server, a cloud, a building control unit, an end device, or a mobile device. The evaluation unit 101 and the external unit 102 are connected to each other for data transmission.

[0100] The door closer 1 includes a data transmission unit 44. In Fig. 1 The diagram schematically depicts a wireless data transmission from this data transmission unit 44 to the external evaluation unit 101. It is located according to Fig. 1a If the evaluation unit 101 is an internal evaluation unit within the door closer 1, the data transmission unit 44 transmits wirelessly to the external unit 102.

[0101] The monitoring system 100 also includes a lever arrangement 103. The lever arrangement 103 consists of a lever 104 and a slide rail 105.

[0102] According to Fig. 1 The door closer 1 is located on a door 200. The guide rail 105 is accordingly attached to a wall 202. The lever 104 connects the door closer 1 to the guide rail 105 on the wall 202. As shown in the schematic diagram in Fig. 1 As shown, wall 202 is synonymous with the frame of door 200.

[0103] The door 200 is mounted so as to rotate relative to the wall 202 by means of two hinges 201.

[0104] Unless otherwise specified in detail, all figures are always referenced below: The door closer 1 has a housing 2. A first end face 2.1 and an opposing second end face 2.2 are defined on the housing 2 (see Fig. 3 ).

[0105] In addition to the housing 2, the door closer 1 has a mounting plate 50 and a cover 30. The housing 2 is attached to the mounting plate 50. The mounting plate 50 includes fastening elements 51, designed as holes. The mounting plate 50 serves to attach the door closer 1 to the door 200 or the wall 202. Furthermore, the door closer 1 includes a module 40. Fig. 3 shows an exploded view of these four assemblies, namely housing 2, module 40, cover 30 and mounting plate 50.

[0106] Furthermore, the door closer 1 has an output shaft 3. The output shaft 3 is rotatably mounted in the housing 2 and is actuated by an energy storage device 4, designed as a coil spring (see Fig. 4 ). As in particular Fig. 7 As shown, the output shaft 3 is supported on both sides by means of an axle bearing 13. The axle bearing 13 is secured with a screwed-in axle bearing cap 14. This axle bearing cap 14 is considered part of the housing 2.

[0107] The output shaft 3 is free on both sides (see Fig. 7 ), so that, in principle, the lever assembly 103 can be attached to the output shaft 3 on both sides. In practice, however, only one side of the output shaft 3 is used for attaching the lever assembly 103. The other side of the output shaft 3 is used for positioning a sensor unit 20 in the door closer 1.

[0108] The output shaft 3 has a polygon 3.1, designed as a square, on each of its two sides. The output shaft 3 is rotatable about a pivot axis 3.3. Coaxial to the pivot axis 3.3, the output shaft 3 has a mounting receptacle 3.2 on each side. The mounting receptacle 3.2 is designed as a hole with an internal thread and serves to attach the lever assembly 103 or a sensor 21 of the sensor unit 20, as will be described in detail below.

[0109] In Fig. 4 The housing 2 is hidden, so that the internal components of the door closer 1 are visible. Accordingly, the door closer 1 comprises a transmission unit 5 inside the housing 2. This transmission unit 5 has a cam 5.1 that rotates with the output shaft 3. A closing piston 5.2 is guided on the cam 5.1 by means of a closing piston roller 5.3. The closing piston roller 5.3 rolls on a flank 5.4 of the cam 5.1. This is shown in detail in the schematic sectional view in Fig. 5 .

[0110] Furthermore, they Fig. 4 und 5 , that a damping piston 6 is guided linearly within the housing 2. This damping piston 6 also rolls against the cam 5.1 with a damping piston roller 7.

[0111] The cam 5.1 has two opposing flanks 5.4 that converge in a recess 5.5. The flanks 5.4 are convex, resulting in a heart-shaped cam 5.1.

[0112] In the representations according to Fig. 4 und 5 The energy storage device 4 is in a discharged state. The closing piston roller 5.3 rests within the recess 5.5 against the cam 5.1. This relative position between cam 5.1 and closing piston roller 5.3 only occurs if the door closer 1 is not yet installed or if the connection via the lever assembly 103 is interrupted due to damage or tampering. However, if the door closer 1 is installed correctly and the connection between the door closer 1 and the wall 202 is ensured via the lever assembly 103, the output shaft 3 is in the position shown in the illustration. Fig. 5 rotated so that the closing piston roller 5.3 rests outside the recess 5.5.

[0113] Fig. 5 The diagram schematically illustrates a closing direction of rotation 12, in which the output shaft 3 rotates when the door 200 is closed. An opening direction of rotation runs opposite to this indicated closing direction 12.

[0114] Furthermore, it shows Fig. 5 For illustrative purposes only, a closing rotation angle 10 of the output shaft 3 is shown, separating a first angular range 8 from a second angular range 9. The closing rotation angle 10 is simplified here as a line, since, within the scope of the invention, it is not important from which 0° position the closing rotation angle 10 is measured, but rather that the closing rotation angle 10 separates the first angular range 8 from the second angular range 9. The exemplary rotation angle of the output shaft 3 is the actual rotation angle 11 – also simplified as a line. A reference leg for all rotation angles, including the closing rotation angle 10 and the actual rotation angle 11, can in principle be placed at various positions, since only the relative values ​​of the rotation angles to each other are relevant.

[0115] The actual rotation angle 11 lies, according to the schematic representation, in Fig. 5 In the second angular range 9. If the output shaft 3 is rotated against the closing direction of rotation 12, the actual rotation angle 11 moves out of the second angular range 9, exceeds the closing rotation angle 10 and reaches the first angular range 8. During normal use of the door, the actual rotation angle 11 only moves within this first angular range 8.

[0116] In the Figur 5 The first angled section 8 is located in the half of cam 5.1 shown above. The lower half of cam 5.1 is not used in operation; for this purpose, the door closer 1 would have to be in a different arrangement, e.g., in a left-hand arrangement instead of a right-hand arrangement.

[0117] The cam 5.1 is designed such that its radius decreases continuously from the closing rotation angle 10 into the second rotation range 9. This causes the tensioned energy storage device 4, via the closing piston 5.2, to rotate the cam 5.1 from the closing rotation angle 10 into the second rotation range 9, provided this is mechanically possible. However, with a door closer 1 installed, the lever assembly 103 prevents this movement. Therefore, a rotation angle in the second rotation range 9 indicates that the door closer 1 and / or the lever assembly 103 are not correctly installed.

[0118] In other words: Should damage or tampering occur, particularly on the lever arrangement 103, the output shaft 3 will rotate in the closing direction 12 due to the energy storage device 4, until the actual rotation angle 11 is again detected in the second angular range 9.

[0119] Furthermore, a distinction can be made as to whether the actual rotation angle 11 corresponds to the closing rotation angle 10 or occupies a position in the first rotation angle range 8. The positions in the first rotation angle range 8 correspond to an open door.

[0120] Evaluation unit 101 has a timer to measure a duration. If the actual rotation angle 11 remains within the first angle range for longer than a duration stored in evaluation unit 101, a message is generated.

[0121] Furthermore, the evaluation unit 101 can detect whether the actual rotation angle 11 changes within the first rotation angle range 8, thus indicating whether the door 200 is being opened or closed. During a closing movement, the evaluation unit 101 can start the timer and measure the time until the closing rotation angle 10 is reached. If the resulting door closing time is too short or too long, a message can be generated.

[0122] The sensor unit 20 is provided for detecting the actual rotation angle 11. The exact design of the sensor unit 20 results in particular from the Fig. 3 , 4 and 6 bis 12 Accordingly, the sensor unit 20 includes a sensor mounting 22 (see below). Fig. 7 The sensor mounting 22 is preferably made of plastic. The sensor mounting 22 is screwed into the mounting receptacle 3.2 of the output shaft 3.

[0123] The sensor mounting 22 has a mounting head 22.1 (see Fig. 8 The sensor 21, in particular designed as a permanent magnet, is mounted, in particular glued, onto this mounting head 22.1.

[0124] The fastening head 22.1 comprises a rim 22.2 and a positive locking element 22.3 (see Fig. 9 The rim 22.2 surrounds the encoder 21. The positive locking element 22.3 and the encoder 21 interlock. The rim 22.2 and / or the positive locking element 22.3 enable precise positioning of the encoder 21 relative to the output shaft 3 and thus relative to the axis of rotation 3.3. In particular, this ensures that the encoder 21 is arranged symmetrically to the axis of rotation 3.3.

[0125] The sensor mounting 22 can have a tool engagement 22.4, which makes it particularly easier to screw the sensor mounting 22 into the mounting receptacle 3.2.

[0126] A sensor 23 is located directly next to the encoder 21, but not touching it. This sensor 23 is attached to the end face of the output shaft 3 by means of a sensor mounting assembly 24. Thus, the sensor mounting assembly 24 is directly attached to the housing 2.

[0127] The sensor mounting assembly 24 comprises a holder 24.1 and a sensor circuit board 24.2. The sensor 23 is located on this sensor circuit board 24.2. The sensor circuit board 24.2 is attached by means of the holder 24.1.

[0128] The bracket 24.1 has a bracket extension 24.4 (see Fig.7 , 8 , 10 ). This extends around the output shaft 3, so that the output shaft 3 projects into the mounting extension 24.4.

[0129] The mounting extension 24.4 bears axially against the housing 2 on the inside, specifically against the axle bearing closure 14. This causes the mounting extension 24.1 to rest against the housing 2. Radially on the outside, the mounting extension 24.4 clamps against an inner surface of the housing 2, thus securing the mounting extension 24.1 to the housing 2.

[0130] Furthermore, the characters, in particular, show Fig. 6 The bracket 24.1 has a retaining spring 24.5. The retaining spring 24.5 rests against the inside of the cover 30, thus clamping the bracket 24.1 between the cover 30 and the housing 2. This ensures that the sensor has minimal play relative to the transmitter 21.

[0131] The sensor receiving device 24, in particular the holder 24.1, has a holder clip 24.3 (see Fig. 7 and 8 ) on. The sensor circuit board 24.2 is attached to the bracket 24.1 by means of this mounting clip 24.3.

[0132] In particular Fig. 11 Figure 3 illustrates that the cover 30 has fastening tabs 30.1. These fastening tabs 30.1 allow the cover 30 to be attached to the mounting plate 50, in particular by screwing it on. Furthermore, Figure 3 shows that the cover 30 has fastening tabs 30.1. Fig. 11 The cover 30 has at least one mounting receptacle 30.2 on its inner side. The bracket 24.1 projects into this mounting receptacle 30.2. In particular, it is provided that a recess 30.3 without mounting tabs 30.1 is provided in the area of ​​the mounting receptacle 30.2. This ensures that the mounting tabs 30.1 do not obstruct the bracket 24.1 when the cover 30 is installed.

[0133] Fig. 12 Figure 1 shows an alternative mounting of the sensor 23. In this arrangement, the sensor 23 is also mounted on the sensor circuit board 24.2. The bracket 24.1 holds the sensor circuit board 24.2. However, the bracket 24.1 is designed to be mounted directly onto the mounting plate 50, in particular by screwing it on. This also makes it possible to mount the sensor 23 directly to the end face of the output shaft 3 and thus directly to the encoder 21.

[0134] According to Fig. 13 The cladding 30 has two opposing end walls 31. The end walls 31 are connected to each other via two opposing side walls 32. In particular, it is provided that the two end walls 31 and the two side walls 32 together form the basic body of the cladding 30. This basic body of the cladding 30 can be closed by means of a cover 33.

[0135] Fig. 13 Figure 33 shows the removed cover. It is clearly visible that the described mounting receptacle 30.2 is formed twice on the inside of one of the two side walls 32. This double design of the mounting receptacle 30.2 is used in particular when the housing 2 is switched between a left-hand arrangement A and a right-hand arrangement B, as shown by the following: Fig. 19 will be explained in more detail later.

[0136] The same applies to the depicted axle recess 34 in Fig. 13 In the illustration shown, the left-hand axle recess 34 is used to connect the lever assembly 103 to the output shaft 3. A similar axle recess 34 is also provided on the right side of the housing 30 shown, which is either closed by a blanking plate (not shown) or can be broken out.

[0137] Furthermore, it shows Fig. 13 The aforementioned module 40 is located within the housing 30. This module 40 can also be positioned on either side of the housing 30, due to the optional left-side arrangement A and right-side arrangement B of the housing 2. Therefore, it shows Fig. 13 A module receptacle 35 is provided on both end walls 31 of the cladding 30. In the illustration according to Fig. 13 The right module slot 35 is used.

[0138] Each of the module receptacles 35 has a module slot 35.1 and a module clip 35.2. As will be described below, the module 40 comprises a module circuit board 43. This can be inserted into the module slot 35.1 and secured by means of the module clip 35.2. Alternatively (see below) Fig. 18 The module 40 is attached to the mounting plate 50, in particular screwed in place. In this alternative, the module groove 35.1 and the module clip 35.2 can be omitted.

[0139] Module 40 has a housing arrangement 41. According to Fig. 13 bis 15 The housing assembly 41 comprises an inner housing 41.1 and an outer housing 41.2. The inner housing 41.1 serves to directly accommodate batteries 42. The inner housing 41.1 is arranged within the outer housing 41.2. The outer housing 41.2 is attached to the module circuit board 43 and additionally supported against the mounting plate 50 by spacers 41.3.

[0140] The spacers 41.3 ensure a distance 41.4 (see Fig. 14 ) between module 40 and mounting plate 50. This distance 41.4 can prove advantageous in the event of a fire if the mounting plate 50 is heated via the door 200, since the distance 41.4 prevents direct heat transfer to the module 40 and thus to the batteries 42.

[0141] Fig. 16 und 17 Figure 1 shows a variant of module 40. In this variant, the housing arrangement 41 has only the inner housing 41.1. The inner housing 41.1 serves to directly accommodate the batteries 42. The inner housing 41.1 is attached to the module circuit board 43. The distance 41.4 (see Figure 1) is also maintained in this configuration. Fig. 17 ) complied with.

[0142] Fig. 18 Figure 1 shows a variant for attaching the module 40 to the mounting plate 50. The housing assembly 41 is attached to the mounting plate 50 by means of a housing fastener 45, for example, a screw. The module receptacle 35 can also be omitted. Due to the optional left-side arrangement A and right-side arrangement B of the housing 2, the module 40 can preferably be attached to both sides of the mounting plate 50 using the housing fastener 45.

[0143] In all illustrated variants, module 40 can be removed without damage. For tool-free removal, the module clip 35.2 can be designed to be sufficiently large for manual operation. The housing fastening 45 can also be removed without tools, e.g., by means of a wing nut.

[0144] As in Fig. 14 and 17 , 18In purely schematic terms, the data transmission unit 44 can be located in module 40, for example in or on the module circuit board 43.

[0145] The housing 2 can be divided into two halves, with the first half corresponding to the first end face 2.1 and the second half corresponding to the second end face 2.2. The output shaft 3 is located in the first half and thus closer to the first end face 2.1 than to the second end face 2.2. The energy storage device 4 is located at least partially in the second half and thus closer to the second end face 2.2 than to the first end face 2.1.

[0146] How, in particular, a synthesis of, for example, Fig. 1 and Fig. 3 To clarify, the first end face 2.1 faces at least one hinge 201 of the door 200. Similarly, the second end face 2.2 faces a main closing edge 203 of the door 200.

[0147] Fig. 19 This illustrates in detail the previously mentioned left-side arrangement A of housing 2 and the right-side arrangement B of housing 2. The four illustrations of the Fig. 19 Components are gradually hidden to clearly illustrate the complete structure.

[0148] Fig. 19 For clarity, both arrangements A and B are shown; it is understood that only one of these two arrangements is ever used on a door 200. For orientation, the first illustration shows Fig. 19 also the hinges 201 of the door 200. These hinges 201 always have the first end face 2.1 of the housing 2 and thus half of the housing 2 with the output shaft 3 assigned to them.

[0149] Fig. 19 This illustrates that the module 40 is positioned on the mounting plate 50 next to the second end face 2.2 of the housing 2. When switching between the left-hand arrangement A and the right-hand arrangement B, the mounting plate 50 is not rotated. Only the housing 2 is rotated, so that the first end face 2.1 and the second end face 2.2 change their left / right orientation. The mounting plate 50, particularly with its fastening elements 51, is designed such that the housing 2 can be attached to the mounting plate 50 in both the left-hand arrangement A and the right-hand arrangement B, ensuring that the module 40 always occupies space next to the second end face 2.2.

[0150] For example Fig. 19 As shown, the mounting plate 50 can have an alignment indicator 52, for example in the form of arrows. This alignment indicator 52 shows in which orientation the mounting plate 50 must be attached. The last illustration in Fig. 19 This clarifies that the alignment indicator 52 is aligned in the same way for both the left-hand arrangement A and the right-hand arrangement B, which means that the mounting plate 50 does not need to be rotated.

[0151] Figur 20 Figure 300 shows a method 300 that is not part of the invention. Method 300 is preferably carried out with a monitoring system 100, as described above.

[0152] In a first step 301, the actual rotation angle 11 is recorded. In a second step 302, the actual rotation angle 11 is compared with a limit value, in particular with a closing rotation angle 10. If the actual rotation angle 11 is, for example, smaller than the limit value, then the actual rotation angle 11 is within the second rotation angle range 9. This triggers a message from the evaluation unit 101 in a third step 303. If, however, the comparison shows that the rotation angle 11 is outside the second rotation angle range 9, then no message is generated.

[0153] The comparison between the actual rotation angle 11 and the closing rotation angle 10 preferably takes place in the evaluation unit 101. Alternatively, the actual rotation angle 11 can of course also be larger than the limit value, in particular the closing rotation angle 10, if the actual rotation angle is located in the second rotation angle range 9. This is determined by the position of the reference arm.

[0154] For example, the closing rotation angle 10 can depend on the thickness of a door 200.

[0155] The value of the closing rotation angle 10 can be set during commissioning. For this purpose, the evaluation unit 101 or the external unit 102 is in commissioning mode. An installer can specify that the door 200 is closed via direct or indirect input. The evaluation unit 101 and / or the external unit 102 can then adopt the measured actual rotation angle 11 as the closing rotation angle 10. Thus, the closing rotation angle 10 can be programmed.

[0156] Alternatively, the installer can determine the respective closing angle 10 depending on the installation situation. For this purpose, a table may be available, for example, specifying the closing angle 10 for different door thicknesses or different door and / or frame geometries. The installer can, for example, enter the door thickness or the closing angle 10 via an input on the external unit 102.

[0157] Alternatively, the second rotation angle range 9, or at least a limit value of the second rotation angle range, is predefined in the evaluation unit 101 before installation. Since the closing piston 5.2 always moves into the recess 5.5 if the door closer 1 is not properly mounted on the door 200, it is not necessary to determine the exact closing rotation angle 10. The second rotation angle range 9, or the limit value of the second rotation angle range 9, can, for example, be determined such that any possible closing rotation angle 10 lies outside the second rotation angle range 9. This makes it possible to electronically store the rotation angle range 9, or a limit value of the rotation angle range 9, in the evaluation unit 101 before commissioning. Bezugszeichenliste

[0158] 1 Door closer 2 Housing 2.1 First end face 2.2 Second end face 2.3 Opening 2.4 Inner wall of the opening 3 Output shaft 3.1 Polygon 3.2 Mounting receptacle 3.3 Axis of rotation of the output shaft 4 Energy storage 5 Transmission unit 5.1 Cam 5.2 Closing piston 5.3 Closing piston roller 5.4 Flank 5.5 Recess 6 Damping piston 7 Damping piston roller 8 First angular range 9 Second angular range 10 Closing rotation angle 11 Actual rotation angle 12 Closing rotation direction 13 Axle bearing 14 Axle bearing lock as housing component 20 Sensor unit 21 Encoder 22 Encoder mounting 22.1 Mounting head 22.2 Edge 22.3 Positive locking element 22.4 Tool engagement 23 Sensor 24 Sensor mounting device 24.1 Bracket 24.2 Sensor circuit board 24.3 Bracket clip 24.4 Bracket extension 24.5 Mounting spring 30 Cover 30.1 Mounting tabs 30.2 Bracket receptacle 30.3 Recess 31 End walls 32 Side walls 33 Cover 34 Axis recess 35 Module receptacles 35.1 Module groove 35.2 Module clip 40 Module 41 Housing assembly 41.1 Inner housing 41.2 Outer housing 41.3Spacer 41.4Spacer 42Batteries 43Module circuit board 44Data transmission unit 45Housing mounting 46Module opening . 50 Mounting plate 51 Fasteners 52 Alignment indicator 100 Monitoring system 101 Evaluation unit 102 External unit 103 Lever arrangement 104 Lever 105 Slide rail 200Door 201Hinges 202Wall (door frame) 203Main closing edge 300 Procedure 301 Procedure Steps 302 Procedure Steps 303 Procedure Steps Left-side arrangement of the housing; Right-side arrangement of the housing

Claims

1. A monitoring system (100) comprising a door closer (1) for closing a door (200), • with a housing (2) and an output shaft (3) mounted therein, designed for fastening a lever arrangement (103), • with a mechanical energy storage device (4) in the housing (2), which acts on the output shaft (3) for rotation in a closing direction of rotation (12), wherein the energy storage device (4) is preferably in the form of a spring, wherein the output shaft (3) is rotatable into a first angle range (8), which can be used for opening and closing the door (200), and into a second angle range (9), wherein the second angle range (9) is not occupied by the output shaft (3) when the door closer is properly installed on the door and in operation, and a boundary between the first angle range (8) and the second angle range (9) represents a closing position of the output shaft (3), • with a sensor unit (20) for recording an actual angle of rotation (11) dependent on the angle of rotation of the output shaft (3), and an evaluation unit (101), • wherein the evaluation unit (101) is designed to generate a message when the actual angle of rotation (11) lies in the second angle range (9), • characterised in that the door closer (1) comprises a module (40) with at least one battery (42), wherein the at least one battery is designed to supply power to the sensor unit, • wherein the module comprises a module circuit board (43) and the module (40) is fastened by means of the module circuit board (43).

2. The monitoring system according to claim 1, wherein in the evaluation unit is stored a closing angle of rotation (10), which represents a closing position of the output shaft (3) and separates the first angle range (8) from the second angle range (9).

3. The monitoring system according to claim 1 or 2, wherein the door closer (1) is designed to rotate the output shaft (3) into the second angle range (9) as soon as a connection between the output shaft (3) and the door (200) or between the output shaft (3) and a wall (202) is released.

4. The monitoring system according to one of the preceding claims, wherein the output shaft (3) in its closing position is acted upon by the energy storage device (4) for rotation in the closing direction of rotation (12).

5. The monitoring system according to one of the preceding claims, wherein the sensor unit (20) comprises a sensor (23) and an encoder (21), wherein the encoder (21) is arranged or designed on the output shaft (3), wherein the sensor (23) is designed and arranged for detecting, in particular without contact, the encoder (21), in particular a position and / or a rotation and / or an acceleration of the encoder (21), in order to record the actual angle of rotation (11).

6. The monitoring system according to claim 5, wherein the encoder (21) comprises a permanent magnet and wherein the sensor (23) is a magnetic sensor, in particular a Hall sensor.

7. The monitoring system according to claim 5 or 6, wherein the encoder (21) is fastened, preferably screwed, to the end face of the output shaft (3).

8. The monitoring system according to one of claims 5 to 7, wherein the axis of rotation (3.3) of the output shaft (3) intersects the sensor (23) and / or the encoder (21); preferably wherein the sensor (23) is arranged symmetrically to the axis of rotation (3.3) and / or preferably wherein the encoder (21) is arranged symmetrically to the axis of rotation (3.3).

9. The monitoring system according to one of the preceding claims, wherein • the output shaft (3) is exposed on two opposite sides of the housing (2) for optional fastening of the lever arrangement (103); • preferably comprising the lever arrangement (103), wherein the lever arrangement (103) is fastened to the output shaft (3) on one side and the encoder (21) is fastened to the output shaft (3) on the other side.

10. The monitoring system according to one of claims 5 to 9, wherein the sensor (23) is arranged on a sensor receiving arrangement (24), in particular comprising a sensor circuit board (24.2), preferably: • the door closer (1) comprises a mounting plate (50) and the housing (2) of the door closer (1) and the sensor receiving arrangement (24) are fastened to the mounting plate (50), • and / or the sensor receiving arrangement (24) is fastened to the housing (2) of the door closer (1), • and / or the door closer (1) comprises a panelling (30), which covers the housing (2) of the door closer (1), and the sensor receiving arrangement (24) rests on the inside of the panelling (30).

11. The monitoring system according to one of the preceding claims, wherein the evaluation unit (101) is designed to relay the message to a unit (102), in particular building control unit and / or cloud and / or server and / or terminal and / or mobile terminal.

12. The monitoring system according to one of the preceding claims, • wherein the evaluation unit (101) generating the message is arranged as an internal evaluation unit in the region of the door (200), in particular in the door closer (1), • or wherein the evaluation unit (101) generating the message is outsourced as an external evaluation unit, wherein the door closer (3) is designed to send the actual angle of rotation (11) or a value derived therefrom to the external evaluation unit.

13. The monitoring system according to one of the preceding claims, wherein the module (40) comprises a data transmission unit (44), in particular designed for wireless data transmission.

14. The monitoring system according to claim 13, wherein: • the door closer (1) comprises a panelling (30), which covers the housing (2) of the door closer (1), and the module (40) is fastened on the inside of the panelling (30), • and / or the door closer (1) comprises a mounting plate (50), and the housing (2) of the door closer (1) and the module (40) are fastened to the mounting plate (50).

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