Door system

Abstract

The invention relates to a door system comprising a door with a leaf, a door closer for automatically closing the leaf, a closing force adjustment device for automatically adjusting the closing force of the door closer, a control device for the closing force adjustment device and a signal device which is configured to output a signal indicating whether an air pressure load is applied to the leaf which deviates from a predetermined air pressure load, wherein the control device is configured to adjust the closing force of the door closer depending on the signal.

Description

[0001] The present invention relates to a door system comprising a door with a leaf, a door closer for automatically closing the leaf, a closing force adjustment device for automatically adjusting the closing force of the door closer, and a control device for the closing force adjustment device.

[0002] Door closers often pose a hindrance for disabled, elderly, or young people, as they make it difficult to open a door. However, door closers are necessary to ensure that doors close securely and thus protect critical fire compartments.

[0003] To ensure that the doors close securely even in wind or drafts, the door closers are typically set to a high closing force, even though this is rarely needed.

[0004] In stairwells with positive pressure ventilation systems, in the event of a fire, the user must open the door against the door closer and the overpressure from the positive pressure ventilation system, resulting in very high opening forces. This impairs accessibility and poses a safety risk.

[0005] EP 1 340 877 A2 describes a door drive with a motorized closing force adjustment. The movement of the door leaf is detected by a sensor, whose output signal is used to adjust the closing force.

[0006] CH 712 076 A2 describes a locking device for a door. The opening force required to open the door can be adjusted during operation. If there is excess pressure in a room, e.g., in the event of a fire, the closing force is reduced so that people can still open the door safely.

[0007] The invention solves the above-mentioned problems by a door closer according to claim 1.

[0008] This makes it easy to ensure, on the one hand, that the leaf closes securely and, on the other hand, that the door can be used safely in an environment where problematic air pressure loads may occasionally occur.

[0009] In particular, the specified air pressure load may have a value or range of values ​​that corresponds to a standard air pressure load. The specified air pressure load may, in particular, be zero or a range around zero.

[0010] In principle, the specified air pressure load can be specified, for example, as a range of values ​​or as a maximum and / or minimum value. The specified air pressure load can, for example, be stored in the control unit by the manufacturer and / or can be specified subsequently, e.g., by a user or a service technician.

[0011] For example, the door closer can be operated as a normal door closer, and the closing force can be reduced or increased as needed, adapting it to the ambient conditions. To the extent that the closing force is adapted to the ambient conditions, this can also be referred to as adaptive closing force adjustment.

[0012] The door system of the invention is particularly suitable for complying with standard specifications regarding opening force in stairwells with positive pressure ventilation systems. The adaptive closing force can also be adjusted depending on the weather conditions. This ensures barrier-free access during normal operation and secure closing in windy conditions. In principle, the closing force of the door closer can also be automatically adjusted during installation using the closing force adjustment device for the specified air pressure load or normal operation. Furthermore, the invention allows for a compact design of the door closer and a comparatively cost-effective construction.

[0013] An air pressure load can generally be effective in either the opening or closing direction. The signal from the signaling device can, for example, additionally indicate whether the air pressure load is effective in the opening or closing direction.

[0014] The signaling device can, for example, have a sensor for the air pressure load, which determines whether an air pressure load is applied to the sash that deviates from a predetermined air pressure load. In particular, the sensor can also be configured to determine whether the air pressure load is effective in the opening or closing direction.

[0015] According to one embodiment, the control device is configured to reduce the closing force of the door closer when an increased air pressure load is applied to the door leaf in the closing direction. This makes it easier to pass through the door in the event of an air pressure load.

[0016] A further development provides for the door system to include a positive pressure ventilation system that exerts air pressure on the door leaf when activated, with the signal from the signaling device indicating whether the positive pressure ventilation system is active or not. This makes it easy to ensure that the door can be opened with only minimal force, particularly with a standard-compliant opening force, even when the positive pressure ventilation system is active.

[0017] The signaling device can, for example, be a fire alarm system. Typically, a positive pressure ventilation system is activated as a result of a fire alarm. The fire alarm can therefore, for example, be used as a signal indicating whether the air pressure load on the sash deviates from the specified air pressure load. In principle, however, the positive pressure ventilation system itself can also issue a corresponding signal or form a signaling device.

[0018] The control device can in particular be designed to reduce the closing force of the door closer when the positive pressure ventilation system is active. For example, in stairwells with positive pressure ventilation systems, doors usually open into the stairwell, i.e. the positive pressure ventilation system generates an air pressure load on the leaf in its closing direction. However, if, for example, the positive pressure ventilation system creates an air pressure load in the opening direction, the control device can alternatively be designed to increase the closing force of the door closer when the positive pressure ventilation system is active. This can ensure safe closing after the door has been passed through. A combination of these approaches is also possible, for example if positive pressure ventilation systems can be controlled differently for different building sections.

[0019] A positive pressure ventilation system creates positive pressure in the stairwell. This keeps the stairwell smoke-free. Escape doors on the upper and lower floors usually open into the stairwell, counteracting the positive pressure. The exit from the ground floor stairwell to the outside opens outward from the stairwell and closes against the positive pressure.

[0020] Depending on the door's opening direction and on which side the overpressure is applied, the closing force is either increased or reduced. This can be configured in the control unit during commissioning.

[0021] Normally, the system is designed for doors that open into the stairwell against air pressure in order to reduce the closing force to a minimum (EN3 according to EN1154) in the event of a fire.

[0022] Other use cases are optionally conceivable.

[0023] The door closer according to the invention can therefore be particularly advantageously installed in a stairwell with a positive pressure ventilation system for keeping smoke free. The door closer preferably has a drive unit that can be controlled by a control device. The drive unit is preferably connected to the door closer in such a way that it can influence, in particular reduce or increase, the opening or closing force of the door closer. The control device is preferably connected to a control center in the building in such a way that, for example, in the event of a fire, the control device receives a signal by which the control device instructs the drive unit to reduce the closing force of the door closer. In this way, fleeing persons can escape from the building via the stairwell without great expenditure of effort.

[0024] In a further embodiment, the signal from the signaling device indicates whether or not there is wind in the vicinity of the door system and / or the prevailing wind speed in the vicinity of the door system. If there is wind in the area of ​​the leaf, this makes it easy to ensure that the leaf closes securely.

[0025] According to an advantageous embodiment, the signaling device comprises a wind sensor. The wind sensor can be arranged, for example, directly at the door or on the outside of or on top of the building in which the door is located.

[0026] According to a further advantageous embodiment, the signaling device can be configured to obtain information from a remote device, for example, an internet server, regarding whether or not there is wind in the vicinity of the door system and / or the wind strength in the vicinity of the door system. For example, the information can be determined from online weather data.

[0027] The signaling device can, for example, form a central device or be part of such a device. Alternatively, the signaling device can also be integrated into the door closer and / or the control device.

[0028] The door system, in particular the door closer, the control device, and / or the signaling device can preferably comprise a communication interface, in particular an internet connection. For example, the signal from the signaling device, a signal from an air pressure sensor, a fire alarm signal, a wind signal, and / or weather data can be transmitted via the communication interface.

[0029] According to a further development, the control device is configured to increase the closing force of the door closer when there is wind or when the wind speed exceeds a predetermined value. This provides a simple way to ensure that the door closes securely. In light or no wind, however, a lower closing force can be set to enable the easiest, most barrier-free access possible.

[0030] If the direction of the air pressure load acting on the door, particularly the wind direction, is known, for example because a corresponding sensor is installed on the door or because a wind direction outside the building can be directly correlated with a wind direction at the door, the closing force can also be adjusted depending on the direction of the air pressure load. For example, the closing force can be increased if the wind is in the opening direction and / or decreased if the wind is in the closing direction.

[0031] According to one embodiment, the door closer comprises a closing spring, wherein the closing force adjustment device is configured to adjust the preload of the closing spring in order to adjust the closing force of the door closer. Such a closing force adjustment device can be constructed simply and compactly.

[0032] Thus, according to an advantageous embodiment, the closing spring can be supported on a movable spring seat, wherein the preload of the spring can be adjusted by moving the spring seat.

[0033] The spring seat can be designed, for example, as a spring plate. In particular, the spring seat can be mounted in a housing of the door closer in a manner that prevents rotation and / or allows axial movement.

[0034] According to the invention, the closing force is adjustable via a spindle mechanism, in particular by moving a spring seat via a spindle mechanism. Advantageously, the spindle mechanism can convert a rotational movement of a spindle and / or a drive shaft into an axial movement of the spring seat.

[0035] According to a further development, the spindle mechanism is provided with a trapezoidal thread. This allows for the absorption of particularly high forces and particularly high functional reliability.

[0036] A spindle of the spindle mechanism can, for example, be hollow. Other components of the door closer can be accommodated in the hollow spindle.

[0037] According to the invention, the spindle mechanism comprises an end stop, wherein the end stop is assigned to a zero or reference position in the control device, and wherein the control device is configured to detect when the end stop has been reached. This allows for simple calibration of the closing force adjustment device.

[0038] Reaching the end stop can be monitored or determined, for example, via the motor current of an electric motor driving the spindle mechanism. As the spindle rotates in the direction in which the preload force decreases, the required motor current also decreases. On this basis, the current value of the preload can be determined, at least approximately. If the motor current increases suddenly when the spindle mechanism is moving, it can be deduced that the end stop or a zero or reference position has been reached. When the end stop or the zero or reference position is reached, the motor is preferably switched off. Alternatively or in addition to determining via the motor current, reaching the end stop and / or a zero or reference position can be determined using a sensor. Such a sensor can be designed, for example, as a reed switch, potentiometer, rotary encoder, or similar.

[0039] The end stop can generally be provided at minimum preload or at maximum preload of a closing spring or, advantageously, an end stop can also be provided at minimum as well as at maximum preload.

[0040] Since the preload force is higher at an end stop at maximum preload, detection of the stop is more difficult, and the release forces are also less favorable relative to the maximum motor torque. Therefore, the end stop is preferably designed with minimal preload. This gives the motor sufficient reserves to easily overcome the release forces.

[0041] In a further embodiment, a drive spindle of the spindle mechanism is supported by an axial-radial bearing. This allows the drive spindle to rotate with particularly low force and ensures high functional reliability. An axial-radial bearing can absorb high forces, is compact, and easy to install, which reduces assembly costs.

[0042] The axial-radial bearing can, for example, be arranged on and / or in a component that closes a housing of the door closer. Such a component can form a bearing cover. The axial-radial bearing can, for example, be pre-assembled in a bearing cover that is fixedly arranged in the housing.

[0043] As an alternative to an axial-radial bearing, several individual bearings and / or plain bushings can also be used.

[0044] The end stop for the spindle mechanism or the spring seat can advantageously be used as an axial bearing point for the axial-radial bearing. This advantageously ensures optimal power transmission to the spindle.

[0045] The drive spindle can preferably be sealed from the environment by means of a sealing element between the spindle and the bearing cover.

[0046] In a further development, it is provided that a drive spindle of the spindle mechanism is mounted by means of a bearing, wherein the bearing is arranged on and / or in a component, in particular a bearing cover, wherein the spindle is driven by means of a motor, wherein the motor is centered relative to the component by means of a centering device. According to an advantageous example, the centering device can comprise a centering collar on the component. A recess corresponding to the centering collar can be provided on the motor, a gearbox or a further component provided between the motor and gearbox, in particular a gearbox holder. A reverse arrangement is also possible, i.e. a centering collar on the motor, gearbox or further component, in particular a gearbox holder, and a corresponding recess on the component, in particular the bearing cover.

[0047] According to the invention, the closing force adjustment device is driven by an electric motor. According to the invention, the electric motor is a stepper motor with a planetary gear.

[0048] In principle, the drive spindle can preferably be aligned concentrically with the drive shaft and / or gearbox output shaft. This allows for a compact design and can be easily implemented using a planetary gear. In particular, this allows for maximum motor size and a very compact connection between the drive spindle and the drive or gearbox output shaft. For this purpose, the drive spindle is preferably hollow towards the gearbox output shaft so that the drive spindle can accommodate the gearbox output shaft. The components can be connected to one another, for example, by means of a form-fitting connection. This eliminates the need for an additional and space-consuming coupling element between the drive spindle and output shaft.

[0049] In a further embodiment, the door closer comprises a drive unit that includes the electric motor and the control device. The drive unit can, for example, be flanged to a housing of the door closer.

[0050] The signaling device can, for example, be configured to output the signal wirelessly and / or wired.

[0051] For example, the control electronics can incorporate a Bluetooth, Wi-Fi, and / or network module, or similar, to enable control and / or networking via the building network or external devices. This allows for flexible execution of trigger commands, parameterization, and maintenance. For example, this can also eliminate the need to manually adjust the door closer's closing force. For example, the installer can simply enter the door size and weight in an app, whereupon the control electronics automatically adjust the appropriate closing force.

[0052] Furthermore, and in principle, a networked door closer can also be informed about external influences such as fire alarms, weather, wind, footfall, etc., and react accordingly. If the recorded online weather data indicates that a permissible wind limit is exceeded, it can, for example, be configured to set all door closers in the building to a higher closing force to ensure safe closing. In light winds, however, a lower closing force is preferred to enable the easiest, most accessible access possible.

[0053] In principle, the signaling device can be provided, for example, by a building's control center or another unit remote from the door closer, such as a fire alarm system or a positive pressure ventilation system. However, it can also be integrated into the door closer.

[0054] The control device of the closing force adjustment device can, for example, have its own power supply and / or be supplied with power via a control center of the building in which the door system is provided.

[0055] One embodiment provides that the closing force adjustment device has a mains power connection for the power supply.

[0056] Alternatively or additionally, a battery can be provided to power the closing force adjustment device. This ensures that the closing force adjustment device or the door closer can be operated safely and reliably, even in the event of a power failure. The battery can be provided, for example, in a control center or in the door closer, particularly in a drive unit. A battery in the door closer or drive unit can be optional.

[0057] Advantageously, it can be provided that the closing force adjustment device is supplied with power via the building's power grid during normal operation, wherein the control device is designed to keep the battery at a safe charge level during mains operation.

[0058] Advantageously, the battery voltage can be lower than the voltage of an electric motor of the closing force adjustment device. This allows for a compact design. The battery advantageously has a low voltage of, for example, 3.7 V, which is lower than the motor voltage and, due to the small number of cells, enables a compact design. The voltage is stepped up to a motor voltage, preferably 24 V, for example, via a step-up converter, which can be arranged on the control electronics to save space. This results in a very compact design for the door closer.

[0059] The invention is explained below merely by way of example with reference to the schematic drawings. Fig. 1 shows a door closer of a door system according to the invention in exploded view. Fig. 2 shows the door closer of the Fig. 1 in a longitudinal section. Fig. 3 shows an enlarged section of Fig. 2 . Fig. 4 shows another sectional view of the door closer of the Fig. 1 .

[0060] In Fig. 1 A door closer 10 is shown. The door closer 10 comprises a housing 12 in which a mechanism of the door closer 10 is housed, described in more detail below. The door closer 10 also includes a closing force adjustment device, which includes an actuating unit 14 and a drive unit 16.

[0061] The actuator unit 14 comprises a spring plate 18, a spindle 20, and a bearing cover 22. The bearing cover 22 is fixedly connected to the housing 12 during assembly. A bearing for the spindle 20, described in more detail below, is arranged in the bearing cover 22. The bearing cover 22 forms a cover for the housing 12.

[0062] The drive unit 16 comprises a geared motor 24, which includes a gearbox 26 and an electric motor 28. The electric motor 28 is designed as a stepper motor, while the gearbox 26 is designed as a planetary gear. This enables a particularly compact design.

[0063] The drive unit 16 also includes a housing 30 for accommodating a battery 31 and a control device 32. The gear motor 24 is fixedly connected to a gear holder 33. The control device 32 processes input signals, controls the electric motor 28, and automatically adjusts the operating modes of the door closer 10.

[0064] The control device 32 is configured to adjust the closing force of the door closer via the gear motor 24 and the actuating unit 14 as a function of a signal. The signal is output by a signaling device (not shown in detail) and indicates whether an air pressure load deviating from a predetermined air pressure load is present on a door leaf equipped with the door closer 10. The signaling device can preferably be a central device in the building and / or located remotely from the door closer 10. Alternatively, however, it is also possible for the signaling device to be arranged on the door closer 10 or even integrated into the door closer 10.

[0065] In Fig. 2 The door closer 10 is shown in a longitudinal section in its assembled state. In addition to the Fig. 1The described structural units show, in particular, the interior of the housing 12. Arranged in the housing 12 is a spring 34 designed as a compression spring, which forms a closing spring of the door closer 10, thus applying the closing force for automatically closing the leaf. For this purpose, the spring 34 transmits the force to a piston 36 and, via a gear 38, to a closer shaft 40. The closer shaft 40 is coupled or can be coupled to a door leaf in a manner not shown.

[0066] On the side opposite the piston 36, ie in Fig. 2On the right side, the spring 34 is supported on the spring plate 18. The spring plate 18 is part of the closing force adjustment device and can be moved by means of the drive unit 16 and the actuating unit 14. During normal operation, the spring plate 18 is preferably not moved, i.e., it is static. It forms a counterbearing for the spring 34, and the door closer 10 operates like a conventional door closer during normal operation.

[0067] However, when the control device 32 controls the closing force adjustment device to adjust the closing force of the door closer 10, the spindle 20 is rotated and the spring plate 18, which is coupled to the spindle via a thread, is moved axially. In particular, the spring plate 18 is moved toward the piston 36 to increase the preload of the spring 34 and increase the closing force, or away from the piston 36 to decrease the preload of the spring 34 and decrease the closing force.

[0068] The spring 34 of the door closer 10 rests, on the one hand, on the piston 36, which is displaced against the spring 34 by the gear 30 when the door leaf opens, thus storing energy for the closing process. On the other hand, the spring 34 rests on the spring plate 18 of the actuating unit 14. Depending on the position of the spring plate 18, the preload of the spring 34 on the gear 30 varies, thus changing the closing force of the door closer 10.

[0069] An air pressure load on the wing can be exerted, for example, by wind or by a positive pressure ventilation system. The signaling device (not shown) emits a corresponding signal.

[0070] For example, in the case of strong winds against the closing movement of the leaf, the door closer 10 must have a high closing force in order to securely close the leaf. The preload of the spring 34 must be high for this purpose. Therefore, if, for example, an air pressure load occurs due to wind against the closing direction of the leaf, the spring plate 18 is pushed toward or into the piston 36. Fig. 2 moved to the left to increase the preload of the spring 34 and the closing force.

[0071] In the case of strong winds opposing the opening movement of the leaf, the door closer should have a low opening force in order to be able to pass through the door without excessive force. The preload of the spring 34 must therefore be low. For this purpose, the spring plate 18 is moved away from the piston 36 or Fig. 2 moved to the right.

[0072] Fig. 3 shows an enlarged view of a section of the Fig. 2, in particular the actuating unit 14. In particular, an axial-radial bearing 42 is visible, which is arranged in the bearing cover 22 and held in position. The bearing cover 22 is fixedly connected to the housing 12. The axial-radial bearing 42 forms a bearing for the spindle 20.

[0073] The spindle 20 comprises an end stop 44 for the Fig. 2 visible spring plate 18. When the spring plate 18 rests against the end stop 44, this can, for example, form a zero or reference position. The end stop 44 forms an axial bearing point for the axial-radial bearing 42.

[0074] A sealing element 46 is provided between the spindle 20 and the bearing cap 22. Another sealing element 48 is provided between the bearing cap 22 and the housing 12. This reliably seals the housing 12.

[0075] The spindle 20 has a recess 50 into which a drive shaft 52 of the geared motor 24 extends. The drive shaft 52 forms an output shaft of the gear 26. The drive shaft 52 is positively coupled to the spindle 20, here via a key 54, for transmitting a rotary motion.

[0076] The gear motor 24 is firmly connected to the gear holder 33 via screws 56. The gear holder 33 is also firmly connected to the housing 12 via screws 58, as can be seen from Fig. 4 This also shows a longitudinal section, but the cutting plane is different from the Fig. 2 and 3 is rotated by 90° around the axis of the spindle 20.

[0077] To ensure precise positioning of the drive shaft 52 to the spindle 20 and thereby prevent concentricity errors, wear, and malfunctions, the gear motor 24 is centrally aligned with the bearing cover 22 via the gear holder 33. For this purpose, the bearing cover 22 has a centering collar 60. The gear holder 33 has a recess corresponding to the centering collar 60 and defined by an inner collar 62. The gear motor 26 also has a centering collar 64. The bearing cover 22 and the gear motor 26 are each inserted with their centering collars 60 and 64 into the recess of the gear holder 33, whereby the components are precisely centered relative to one another. This design enables particularly simple production and precise and compact positioning of the components relative to one another.

[0078] Alternatively, for example, a centering collar could be provided on one side of the gear holder 33 facing the bearing cover 22, and the bearing cover 22 could have a recess into which the centering collar of the gear holder 33 can engage. The same applies to the centering between the gear motor 24 and the gear holder 33. List of reference symbols

[0079] 10 Door closer 12 Housing 14 Actuating unit 16 Drive unit 18 Spring plate 20 Spindle 22 Bearing cover 24 Gear motor 26 Gearbox 28 Electric motor 30 Housing 31 Battery 32 Control unit 33 Gearbox holder 34 Spring 36 Piston 38 Gearbox 40 Closer shaft 42 Axial-radial bearing 44 End stop 46 Sealing element 48 Sealing element 50 Recess 52 Drive shaft 54 ​​Key 56 Screw 58 Screw 60 Centering collar 62 Inner collar 64 Centering collar

Claims

1. Door system comprising a door with a leaf, a door closer (10) for automatic closure of the leaf, a closing-force-adjustment device for automatic adjustment of the closing force of the door closer (10), wherein the closing-force-adjustment device is driven by an electric motor (28) and the closing force is adjustable via a spindle mechanism, and a control device (32) for the closing-force-adjustment device, characterized in that a signalling device is provided and is configured to output a signal indicating whether an air-pressure load different from a predefined air-pressure load is present at the leaf, the control device (32) is configured to adjust the closing force of the door closer (10) according to the signal, the electric motor (28) is a stepper motor with a planetary transmission, wherein the spindle mechanism comprises an end stop (44), wherein the end stop (44), in the control device (32), is assigned to a zero or reference position, and wherein the control device (32) is configured to determine that the end stop (44) has been reached.

2. Door system according to Claim 1, characterized in that the control device (32) is configured to reduce the closing force of the door closer (10) if an increased air-pressure load is present at the door leaf in the closing direction.

3. Door system according to Claim 1 or 2, characterized in that the door system (10) comprises an overpressure-ventilation installation, which exerts an air pressure on the leaf of the door if active, wherein the signal of the signalling device indicates whether or not the overpressure-ventilation installation is active.

4. Door system according to Claim 3, characterized in that the control device (32) is configured to reduce the closing force of the door closer (10) if the overpressure-ventilation installation is active.

5. Door system according to at least one of the preceding claims, characterized in that the signal of the signalling device indicates whether or not there is wind prevailing in the surroundings of the door system and / or what the prevailing wind strength is in the surroundings of the door system.

6. Door system according to at least one of the preceding claims, characterized in that the signalling device comprises a wind sensor.

7. Door system according to at least one of the preceding claims, characterized in that the signalling device is configured to obtain from a remote device, for example an internet server, information about whether or not there is wind prevailing in the surroundings of the door system and / or what the prevailing wind strength is in the surroundings of the door system.

8. Door system according to at least one of the preceding claims, characterized in that the door system, in particular the door closer (10), the control device (32) and / or the signalling device, comprises a communication interface, in particular an internet connection.

9. Door system according to at least one of the preceding claims, characterized in that the control device (32) is configured to increase the closing force of the door closer (10) if there is wind prevailing or if there is wind with a wind strength above a predetermined value prevailing.

10. Door system according to at least one of the preceding claims, characterized in that the door closer (10) has a closer spring (34), wherein the closing-force-adjustment device is configured to adjust the preload of the closer spring (34) so as to adjust the closing force of the door closer (10).

11. Door system according to Claim 10, characterized in that the closer spring (34) is supported against a movable spring seat, in particular a spring plate (18), wherein the preload of the closer spring (34) is adjustable by movement of the spring seat.

12. Door system according to at least one of the preceding claims, characterized in that the spindle mechanism has a thread with a trapeziform profile.

13. Door system according to at least one of the preceding claims, characterized in that a drive spindle (20) of the spindle mechanism is mounted by an axial-radial bearing (42).

14. Door system according to at least one of the preceding claims, characterized in that a drive spindle (20) of the spindle mechanism is mounted by means of a bearing (42), wherein the bearing (42) is arranged on and / or in a component (22), in particular a bearing cover, wherein the drive spindle (20) is driven by means of the electric motor (24, 28), wherein the electric motor (24, 28) is centred relative to the component (22) by means of a centring means (60, 62, 64).

15. Door system according to at least one of the preceding claims, characterized in that the door closer (10) comprises a drive unit (16), said drive unit comprising the electric motor (28) and the control device (32).

16. Door system according to at least one of the preceding claims, characterized in that the signalling device is configured to output the signal in a wireless and / or wired manner.

17. Door system according to at least one of the preceding claims, characterized in that the closing-force-adjustment device has a connection for supply of current via a control centre of the building and / or a mains-current connection.

18. Door system according to at least one of the preceding claims, characterized in that a storage battery (31) is provided for supply of current to the closing-force-adjustment device.

19. Door system according to at least one of the preceding claims, characterized in that the voltage of the storage battery (31) is lower than the voltage of an electric motor (28) of the closing-force-adjustment device.

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