Door closing system for closing doors and door with such a door closing system

Abstract

The invention relates to a door closing system for closing doors and to a door with such a door closing system.

Description

[0001] The present invention relates to a door closing system for closing cold storage doors and / or refrigerated room doors and / or emergency exit doors, which have at least one door leaf and at least one door frame, and to a door with such a door closing system. background

[0002] Door closing systems for refrigerators and freezers have long been a familiar feature in the field of household appliances. To ensure a tight seal between the refrigerated compartment and the warmer surroundings, appropriate gaskets are installed between the door leaf and the door frame. Magnetic connections are often used to further secure the closure, or the magnetic strips are integrated directly into the gaskets.

[0003] From the prior art, for example, US Patent 3,790,197 A discloses a magnetic locking mechanism for refrigerators comprising a first row of magnets and a second row of magnets, the first row being located on the door and the second row being located on the refrigerator housing. The first row is movable parallel to the second row to effect either locking by an opposing arrangement of opposite poles of the magnets or unlocking by an opposing arrangement of like poles of the magnets. The arrangements are located on the longitudinal side of the refrigerator door and on the housing, so that the magnetic effect is uniform across all arranged magnets.

[0004] CN 104 567 222 A discloses a refrigerator which has magnetic elements on the refrigerator door which, together with corresponding elements on the refrigerator housing, provide a locking mechanism for the refrigerator door.

[0005] KR 2001 0092060 A discloses an automatic control device to prevent frequent opening of a refrigerator door and the resulting escape of cooling air. The automatic control device comprises a voice sensor, a microcomputer, and an automatic control unit for opening and closing the refrigerator door. The automatic control unit also includes a first magnet attached to the refrigerator body, a second magnet attached to the refrigerator door, and a magnetic force generation unit for converting the polarity or magnetic strength of the magnets in accordance with the output signal of the microcomputer. Task

[0006] For cold storage rooms, refrigerated rooms, and / or emergency exit doors, such door closing systems are usually significantly more complex, requiring an airtight seal achieved through a handle with a corresponding mechanical locking mechanism. This proves to be particularly costly and prone to defects in the manufacture of such doors. The material used must be appropriately resistant to cold or, in the case of emergency exit doors, also heat.

[0007] Therefore, the object of the present invention is to provide a door locking system that overcomes the known disadvantages of the prior art. The present invention provides a door locking system that is mechanically simplified and cost-effective. Solution

[0008] This is implemented with a door closing system according to claim 1. The core concept of the present invention is that the door closing system comprises at least one magnetic means for emitting magnetic field lines and at least one magnetic detector means for receiving the magnetic field lines, wherein the magnetic means and the magnetic detector mean form a force-fit connection when the door is closed, and wherein at least the magnetic means and / or the magnetic detector means is designed to be positionally adjustable along guide sections. This is advantageous because, in particular, the magnetic force leading to the force-fit connection can be adjusted by the possible change in position of the magnetic detector means and / or the magnetic means.

[0009] Surprisingly, it has been shown that, depending on the position of the magnetic element and / or magnetic detector, the door leaf is guided against the door frame at different speeds and / or with a predetermined force. Thus, for the first time, the door closing system described here makes it possible to achieve a controlled and predetermined closing speed and / or closing force for a door, such as a cold storage door, a refrigerated storage door, or an emergency exit door. This allows a single door to be easily modified for different requirements. Consequently, the door closing system described here provides a universally applicable door.

[0010] For example, it is known that different door opening times are required for cold storage rooms and refrigerated rooms. With the door closing system described here, it is therefore possible for the first time to design both cold storage rooms and refrigerated rooms to be sufficiently airtight, for example against air exchange, thus complying with standards, without requiring different closing mechanisms in the manufacturing process. For instance, it is desirable for refrigerated rooms to have significantly shorter opening times so that less warm ambient air can enter the cold storage room. This can be achieved for the first time by changing the position of the magnetic detector element and / or the magnetic element.

[0011] The door closing system described here can also be used for emergency exit doors, allowing them to be opened easily under a predefined, standard-compliant force, for example, by simply pushing or pulling. Complex mechanical opening systems are avoided. This ensures easy operation for users in emergency situations who are often in a hurry.

[0012] The door locking system described here is particularly advantageous because it allows a doorway to be closed without the need for an additional door lock or a locking mechanism. In a particularly advantageous embodiment, this door locking system therefore eliminates the need for an additional lock, such as a bolt or electronic lock. It is thus lock-free. This results in cost savings, as the associated maintenance is also eliminated.

[0013] The at least one magnetic means and the at least one magnetic detector means are also electrically adjustable. This is advantageous if, for example, electrically responsive materials are coupled to the at least one magnetic detector means and / or the at least one magnetic means. It has proven advantageous that such responsive materials undergo a change in shape when an electric current is applied, and, for example, their longitudinal extent changes. Suitable responsive materials include, for example, metal alloys or polymers.

[0014] Further advantageous embodiments are described in the dependent claims.

[0015] In a further advantageous embodiment, the at least one magnetic means and / or the at least one magnetic detector means are manually adjustable. This is advantageous because it allows for particularly quick reconfiguration and repositioning of the two means. In the simplest case, the at least one magnetic means is located in the door frame and the at least one magnetic detector means in the door leaf. This is, of course, not to be understood as limiting, so it is also conceivable that the at least one magnetic detector means is located in the door frame and the magnetic means in the door leaf. It is also conceivable that at least one detector means and at least one magnetic means are provided in both the door frame and the door leaf, for example, alternating with each other.

[0016] For manual repositioning, both means are advantageously accessible from the outside, so that their position can be changed by simply applying force, for example by a user moving them. For this purpose, corresponding guide grooves can be arranged in the guide sections. This advantageously ensures particularly easy handling and operation.

[0017] In a further advantageous embodiment, the at least one magnetic means and / or the at least one magnetic detector means are designed to be adjustable by a motor. This is particularly advantageous if at least one means is not arranged directly on the material surface. For example, it is conceivable that the magnetic means, which is arranged, for instance, in the door frame, is located below the visible surface. Therefore, it is not directly accessible from the outside. In this embodiment, it is advantageous if the magnetic means within the door frame and / or the door leaf can be changed in its position via a corresponding guide axis, which can, for example, be designed as grooves. This change in position can, for example, be effected by at least one drive unit, which changes the position of the magnetic means along the door leaf. For this purpose, the drive unit can advantageously include at least one motor.This is not to be understood as a limitation, so it is also conceivable that the drive unit is designed as a spindle drive, which can be manually operated from the outside by a user, for example by turning a knob, and thus the position change is effected. This is also not to be understood as a limitation, so it is conceivable that the at least one magnetic element and / or the at least one magnetic detector element is manually adjustable, for example via at least one spindle drive.

[0018] In a further advantageous embodiment, the door closing system comprises at least one control unit which is coupled to the at least one magnetic means and / or the at least one magnetic detector means and controls and / or monitors their position changes. This control unit is particularly advantageously integrated into the door leaf and accessible to the user from the outside, for example via a touch panel.

[0019] In a further advantageous embodiment, the door closing system also includes at least one sensor for acquiring cold storage room data. This sensor is particularly advantageous when the door closing system is used for cold storage room doors and / or refrigerated room doors and is coupled with the control unit described above, so that the control unit can also acquire and / or evaluate the corresponding sensor data and / or react to the acquired sensor data, for example, with a delayed door closure. Cold storage room data is advantageously understood to mean any data relevant to the cold storage room and / or refrigerated room, such as its temperature or humidity. Furthermore, it is also conceivable that the at least one sensor could record the duration of the door opening and, with an increase in the cold storage room temperature and / or refrigerated room temperature, trigger an acoustic and / or visual warning signal, advantageously via the control unit.

[0020] Furthermore, it is also conceivable that the door locking system includes at least one magnetic element designed as a combination magnet. This is advantageous because it allows both the door contact function, such as detecting the closed door leaf against the door frame, and the locking function of the door locking system to be achieved with a single component. This reduces the number of components required.

[0021] Furthermore, it is also conceivable that the at least one sensor, in addition to monitoring the duration of the door opening and the warning signal coupling, could also initiate the automatic closing of the cold storage room door and / or the refrigerated room door, which has at least one door closing system as described herein, thus enabling controlled closing of the door. For controlled closing of the door, the control unit regulates the change in position of the at least one magnetic element and / or the at least one magnetic detector element, so that the speed of the door closing is determined by the position of the magnetic detector element and the magnetic element. For example, by moving both elements towards the door hinges, i.e., towards the axis of rotation of the door leaf relative to the door frame, the speed of the door closing can be increased.Both mechanisms can then interact more quickly, resulting in a faster door closure due to magnetic interactions. This is particularly advantageous when the door closing system is used for an emergency exit door, which must always be closed as quickly as possible.

[0022] The at least one magnetic element is electrically controllable. This allows for a polarity reversal. This advantageously creates a damping effect, slowing down and dampening the closing of the door leaf. This is particularly beneficial when the door leaf is close to contacting the door frame, preventing a loud, rapid collision. The control is particularly advantageous in such a way that the door leaf closes slowly and in a controlled manner against the door frame. Furthermore, this electrical control of the at least one magnetic element allows the closing speed of the door leaf to be slowed down and / or accelerated. For this purpose, at least one additional control unit, or the control unit above, is provided, which enables controlled closing of the door leaf using predeterminable threshold values.Furthermore, having at least one control unit is advantageous because it allows for the control of the magnetism of the at least one magnetic element. It is conceivable that the magnetic force of the at least one magnetic element can be switched off via electronic control. This is beneficial if the door leaf needs to be opened quickly in an emergency. To prevent the magnetic force from being counteracted in such an emergency, the control unit detects the brief, high force applied to the door leaf, for example, by pushing or pulling, and switches off the at least one magnetic element. This allows the door leaf to be opened easily and quickly. Once this brief, high force is no longer applied, the control unit readjusts, and the magnetic force is conveniently reset via the control unit.

[0023] In a further advantageous embodiment, the door closing system includes at least one sensor for detecting persons. This sensor can be arranged alone or in addition to the aforementioned sensor for recording cold room data. In the door closing system described here, it has proven advantageous to provide at least one person detection sensor, as this significantly improves the user safety of both the door closing system and the door itself.

[0024] This is particularly relevant when a person and / or at least parts of that person, such as legs or arms, fall into the sensor's detection range, specifically when the door leaf is guided against the door frame by the magnetic interactions between the magnetic detector and the magnetic element. Due to these interactions, the door leaf is automatically guided against the door frame if the two elements are sufficiently close to each other. The person detection sensor should therefore be understood as a safety device that prevents users' limbs from being trapped between the door leaf and the door frame during the automatic closing of the door. It has therefore proven advantageous if the at least one sensor described here is coupled with the control unit described above.If necessary, should limbs actually be caught between the door frame and the door leaf during automatic closing, the control unit can interrupt the automatic door closing process and optionally issue an acoustic and / or visual warning signal, for example via a signal light and / or a beeping sound. This further increases operational safety.

[0025] In a further advantageous embodiment, the door closing system also comprises at least one shape memory material.

[0026] A shape memory material is advantageously understood to be a material that changes its initial shape when subjected to external stress, such as force or temperature, and returns to its original shape once the external stress is removed. Metal-based shape memory materials, such as copper- or nickel-based alloys, have proven particularly advantageous. Nickel-titanium, nickel-titanium-copper, copper-zinc, copper-zinc-aluminum, and / or copper-aluminum-nickel, and / or combinations thereof, have proven especially beneficial. Such shape memory materials are particularly advantageous if they exhibit at least a one-way shape memory effect and / or are superelastic. Furthermore, alloys such as iron-palladium, nickel-iron-calcium, and / or nickel-manganese-potassium can also be used, which may additionally be doped with other metals.The latter alloys advantageously possess a magnetic shape memory material.

[0027] Such metal alloys have also proven advantageous because they can be easily integrated into the door closing system described here. For example, it is conceivable that the at least one magnetic element and / or the at least one magnetic detector element could each be directly and / or indirectly coupled to such a shape-memory material. If, for example, at least one element is deflected from its initial position, the respective element can be returned to its initial position once the force-applied deflection has ceased, without requiring any further manual and / or motorized actuation. This allows the return of the respective element to its initial position to be automated. This is relevant, for example, if the door closing system is part of an emergency exit door.If this door is opened quickly and frantically in an emergency, the shape memory material ensures that the door returns to its closed starting position and prevents, for example, oxygen from continuously entering in the event of a fire.

[0028] It is conceivable that the respective means is directly coupled to the shape memory material. In this embodiment, the shape memory material is arranged directly on the means and, for example, shares a common contact surface with it. However, it is also conceivable that the shape memory material is indirectly coupled to at least one means, such that at least one further component is arranged between the shape memory material and the means.

[0029] This is of course not to be understood as a limitation, so it is also conceivable that, instead of metal alloys, for example, at least one spring element is arranged as a shape-memory material. The spring element also serves to return the at least one element to its initial position.

[0030] It has proven particularly advantageous that the shape memory material intervenes when, for example, a sensor detects that the cold storage room data deviates from predefined limits. This could then trigger automatic door closing, for instance, if too much cold air escapes from the cold storage room and / or if too much warm air enters. This effectively prevents the door from being open for too long, resulting in significant energy savings.

[0031] Furthermore, it is also conceivable to develop shape memory material based on plastic, for example if it has elastic properties, such as rubber.

[0032] Furthermore, it has proven advantageous that the door closing system described here can be used not only to close cold storage doors and / or refrigerated storage doors and / or emergency exit doors. Surprisingly, it has also been shown that the door closing system described here allows for controlled opening. This means that the door leaf swings out relative to the door frame, so that the actual door opening or passageway becomes freely accessible. The magnetic detectors and / or magnets described here require a predetermined force, depending on their position, to be exerted on the door leaf in order to release it from the door frame and swing the passageway open. Therefore, the door closing system is also advantageously designed as a door opening system. To overcome the force-locking effect, at least one door handle is advantageously provided.This is of course not to be understood as limiting, so that handle-like components can also be used, such as an attached and / or foamed-on handle strip or at least a recessed handle on the door leaf.

[0033] The embodiments of the door locking system described here are not exhaustive. For example, it is also conceivable that a door locking system has two magnetic detectors or only one magnetic element. In the simplest case, the magnetic element is designed as a strip magnet. Advantageously, the door frame has the magnetic element, which is arranged on at least two sides of the door frame. In addition, the door leaf advantageously has at least one, and even more advantageously at least two, magnetic detectors arranged opposite the magnetic element. Advantageously, the two magnetic detectors are smaller in area than the strip magnet in the door frame. Advantageously, a first magnetic detector is arranged on the longitudinal side of the door leaf.The door leaf further comprises at least one guide section along which the first magnetic detector element can be moved in its position, advantageously in a vertical direction, along the door leaf. It is particularly advantageous for the magnetic detector element to be moved in its position by applying an external force. In the simplest case, the guide section is designed as a guide groove or other recess. Depending on the geometric design of the magnetic detector element, the cross-section of the guide groove or other recess can be different from angular, for example, round. Advantageously, the guide section has at least one projection that at least partially overlaps, under, or behind the first magnetic detector element. This allows the first magnetic detector element to be held particularly reliably in the guide section.

[0034] Alternatively, or furthermore, a second magnetic detector can be provided on and / or in the door leaf, which is designed to be positionally adjustable within a further guide section in the horizontal direction. Thus, in a particularly advantageous embodiment, a cold storage door and / or a refrigerated storage door with a door closing system described herein has at least two positionally adjustable magnetic detectors.

[0035] This is not to be understood as a limitation, so it is also conceivable that the door leaf has at least one magnetic element, for example, a strip magnet. The position-adjustable magnetic detectors are then arranged accordingly in the door frame. It is particularly advantageous if the at least two magnetic detectors can be adjusted in position along the magnet, resulting in magnetic interactions of varying strengths, which in turn influence the automatic door closing and / or the force required to open the door.

[0036] Furthermore, the present invention also relates to a door for closing a cold storage room and / or a refrigerated room, which advantageously comprises at least one door closing system as described in detail above. It has also proven advantageous if the door closing system is coupled with hinges for opening and / or closing the door. It is conceivable that the hinges are provided as part of the door closing system. This is particularly advantageous because it allows the coupling between the means and / or the shape memory material on the one hand and the hinges for executing the rotational movement of the door leaf on the other hand to be provided at the factory. However, it is also conceivable to retrofit already installed cold storage room doors and / or cold storage room doors with the door closing system described here.It is then advantageous if the hinges for executing the rotational movement of the door leaf can be easily and simply coupled to the door closing system that is being retrofitted. This coupling can be achieved, for example, by means of an adapter that connects the shape-memory material and / or at least one of the elements that is designed to be adjustable in position to the respective door hinge.

[0037] In another embodiment, it is also conceivable to use different magnetic elements. For example, a first magnetic element could be designed as a strip magnet, arranged horizontally, i.e., perpendicular to the door leaf. Furthermore, a second magnetic element is advantageously provided, which is designed to be positionally adjustable along the longitudinal direction of the door leaf, i.e., vertically. This could, for example, be a magnetic element that is positionally adjustable on the door frame and / or on the door leaf. For this purpose, the door frame and / or the door leaf advantageously has guide sections along which the magnetic element is slidable on the directly accessible surface of the door frame and / or the door leaf.It has proven particularly advantageous if the guide sections have a dovetail profile, as this allows for particularly easy movement. Furthermore, it is advantageous for the magnetic element and / or the guide sections to have detent positions, ensuring that the magnetic element is always securely and reliably positioned in the vertical direction. Alternatively, stepless movement of the magnetic element in the vertical direction is also conceivable. For this purpose, a suitable holding mechanism is advantageously provided. In the simplest case, this holding mechanism can be a screw with which the magnetic element is screwed in and thus held. This is, of course, not to be understood as limiting, so it is also conceivable that the magnetic element can be designed to be positionally adjustable in the vertical direction via at least one band.

[0038] In addition to the uses of the door closing system described here, it is also conceivable to use it in the medical field, for example in cold chambers or cryochambers, or in emergency exit doors.

[0039] Further advantages, features and design possibilities will result from the following description of figures illustrating exemplary embodiments, which are not to be understood as restrictive. Brief description of the drawing

[0040] The drawing shows: Figure 1 a schematic, perspective view of a door with a door closing system; and Figure 2 Another schematic, perspective view of a door with a door closing system.

[0041] In the drawings, elements designated with the same reference numerals are essentially equivalent to one another, unless otherwise indicated. Furthermore, components that are not essential for understanding the technical teaching disclosed herein are not shown or described. Additionally, reference numerals are not repeated for all elements already introduced and illustrated, provided that the elements themselves and their function have already been described or are known to a person skilled in the art. Detailed description of exemplary implementations

[0042] In Figure 1Figure 2 shows a door 2 for cold storage rooms and / or refrigerated rooms. The door 2 has a door leaf 4 and a door frame 6. In the embodiment shown here, which is to be understood as exemplary and which does not limit the scope of protection of the invention described herein, the door leaf 4 is connected to the door frame 6 by hinges 8. The hinges 8 allow the door leaf 4 to pivot about a vertical pivot axis, so that the passage opening closed by the door leaf 4 (not shown here) is swung open.

[0043] Furthermore, the door 2 shown here has a door closing system 1. This door closing system 1 includes, by way of example, a first magnetic element 10 and a second magnetic element 12. The first magnetic element 10 is positioned along the short transverse side of the door leaf 4 in the direction Q. In this embodiment, the second magnetic element 12 is positioned along the longitudinal direction of the door leaf 4 in the direction V. It is possible for both magnetic elements 10 and 12 to be arranged on the door leaf 4 and to be slidable along the door leaf 4 in the direction Q and in the direction V via at least one guide section (not shown). It is also conceivable that only one magnetic element 10 or 12 is positioned on the door leaf 4.The second magnetic element 12 or 10 is then positionally adjustable on the door frame 6, also via at least one guide section (not shown). Finally, it is also possible for both magnetic elements 10 and 12 to be arranged on the door frame 6 and to be positionally adjustable relative to it in direction Q and direction V. Depending on the arrangement of the magnetic elements 10 and 12, the magnetic detector elements are arranged opposite each other on the door frame 6 or on the door leaf 4. The magnetic detector elements can also be positionally adjustable. In the embodiment shown here, the magnetic elements 10 and 12 are designed as magnets. Furthermore, the magnetic detector elements can advantageously be arranged below the visible surface of the door leaf 4 and / or door frame 6.This is particularly advantageous because it eliminates open guide sections where dust or other contaminants can accumulate.

[0044] On the transverse side of the door leaf 4, this is spaced away from the door frame 6 by the position-changeable magnetic means 10.

[0045] This is not to be understood as a limitation, of course, so it is also conceivable that, as in Figure 2 As shown, the magnetic means and magnetic detector means are configured in reverse. Figure 2 Figure 2 also shows a door 2, which has a door leaf 4 and a door frame 6, wherein the door leaf 4 and door frame 6 are pivotally connected to each other via hinges 8.

[0046] In this embodiment, the door features a further embodiment of a door closing system 1. This system includes, by way of example, a first magnetic detector 20 and a second magnetic detector 22. The first magnetic detector 20 is positioned along the short transverse side of the door leaf 4 in the direction Q. In this embodiment, the second magnetic detector 22 is positioned along the longitudinal direction of the door leaf 4 in the direction V. It is possible for both magnetic detectors 20 and 22 to be arranged on the door leaf 4 and to be displaceable along the door leaf 4 in the direction Q and in the direction V via at least one guide section (not shown). It is also conceivable that only one magnetic detector 20 or 22 is positioned on the door leaf 4.The second magnetic detector element 22 or 20 is then positionally adjustable on the door frame 6, also via at least one guide section (not shown). Depending on the arrangement of the magnetic detector elements 20 and 22, the magnetic elements (not shown) are arranged opposite each other on the door frame 6 and the door leaf 4, respectively. The magnetic elements can also be positionally adjustable. In the embodiment shown here, the magnetic elements are advantageously designed as strip magnets and arranged below the visible surface of the door leaf 4 and / or door frame 6. This is particularly advantageous because it eliminates the need for open guide sections in which dust or other contaminants can accumulate.

[0047] In both embodiments shown here, the door leaf 4 always has a handle with which the door leaf 4 can be pivoted relative to the door frame 6 under force. The handle is necessary so that the passageway can be swung open and thus be entered by the user. The door closing system described here, as well as a door 2 with such a system, requires an opening handle; otherwise, the door 2 cannot be opened. The handle enables the necessary force to be applied to the door leaf 4 in order to overcome the force-locking effect between the door leaf 4 and the door frame 6 and thus allow the door to be opened. Advantageously, the door handle 30 has Figure 1 and 2 at least one magnetic detector and / or at least one magnetic device.

[0048] Although the invention has been further illustrated and described in detail by the advantageous embodiments, the invention is not limited by the disclosed examples. Other variations can be derived from them by a person skilled in the art without departing from the scope of protection of the invention. Reference symbol list

[0049] 1 Door locking system 2 Door 4 Door leaf 6 Door frame 8 Hinge 10 Magnet 12 Additional magnet 20 Magnet 22 Additional magnet 30 Door handle Q Transverse direction V Vertical direction

Claims

1. Door-closing system (1) for closing doors, in particular cold room doors and / or refrigerator room doors and / or emergency exit doors, which comprise at least one door leaf (4) and a door frame (6), wherein the door-closing system (1) comprises at least one magnetic means (10; 12) for emitting magnetic field lines and at least one magnetic detector means for receiving the magnetic field lines, wherein the at least one magnetic means (10; 12) and the at least one detector means are in magnetic interaction for opening and closing the door leaf (4), wherein magnetic means (10; 12) and the magnetic detector means form a force-acting connection in a closed state of a cold room door and / or a refrigerator room door (2), characterized in that, at least the magnetic means (10; 12) and / or the magnetic detector means is designed to be adjustable in position along guide sections, wherein at least one magnetic means (10) and at least one magnetic detector means are arranged in the region of a short cross-side of the door leaf (4) at the door leaf (4) and the door frame (6), wherein the at least one magnetic means (10) and / or the at least one magnetic detector means are displaceable along the transverse side in the direction (Q) towards the axis of rotation of the door leaf (4), wherein the at least one magnetic means (10; 12) and the at least one magnetic detector means are electrically adjustable, and wherein the polarity of the at least one magnetic means (10) is reversible.

2. Door-closing system according to claim 1, characterized in that, the at least one magnetic means (10; 12) and / or the at least one magnetic detector means is designed to be manually adjustable.

3. Door-closing system according to claim 1, characterized in that, the at least one magnetic means (10; 12) and / or at least one magnetic detector means is designed to be motorically adjustable.

4. Door-closing system according to claim 1, characterized in that, the door-closing system comprises at least one control unit that controls and / or monitors and / or regulates the change in position of the at least one magnetic means (10; 12) and / or the at least one magnetic detector means.

5. Door-closing system according to claim 1, characterized in that, the door-closing system further comprises at least one sensor for detecting cold room data.

6. Door-closing system according to claim 1, characterized in that, the door-closing system comprises at least one sensor for detecting people.

7. Door-closing system according to claim 1, characterized in that, the door-closing system also comprise at least one shape-memory material.

8. Door for closing a cold room and / or a refrigerator room and / or an emergency exit, comprising at least one door-closing system according to at least one of the preceding claims.

9. Door for closing a cold room, comprising at least one door-closing system according to claim 8, characterized in that the door-closing system is designed to be coupled with hinges for opening and / or closing the door.

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