EP3396094A1 - Safety cabinet - Google Patents

Abstract

The invention relates to a safety cabinet and in particular fire protection cabinet for holding hazardous substances. This has a cabinet body (4) and at least one of the cabinet body (4) connected or hereby interacting cabinet door (5). In addition, at least one in the cabinet body (4) arranged sensor (15) is provided, whose sensor signals are evaluated by a control unit (11). According to the invention, a closing signal is derived from the sensor signals when at least one threshold value (S) and / or a limit value (G) of temporal gradients are exceeded by the control unit (11) and converted to the door closure.

Description

The invention relates to a safety cabinet, in particular fire protection cabinet for receiving hazardous substances, preferably a battery cabinet for receiving and storing high-performance batteries such as lithium-ion batteries, with a cabinet body and at least one connected to the cabinet body or hereby interacting cabinet door, and at least one in the cabinet body arranged sensor whose sensor signals are evaluated by a control unit.

Safety cabinets as well as general fire protection cabinets are typically used to contain hazardous substances such as liquid and combustible chemicals. However, it is also possible, for example, to store gas cylinders or solid hazardous substances in the interior. In order to protect the hazardous substances from any external sources of fire, the safety cabinets or fire protection cabinets have a predetermined fire resistance, which corresponds to different fire resistance periods. In fact, the fire cabinets in question are usually classified according to the regulation DIN EN14470. A total of four stages of fire resistance periods of 15 minutes, 30 minutes, 60 minutes and finally 90 minutes are distinguished, as exemplified in the utility model DE 20 2014 101 935 U1 the applicant is described.

If there is a fire outside such a safety cabinet, a fuse provided inside the safety cabinet ensures that the respective cabinet door or the several cabinet doors are automatically closed in case of fire. Because then the fuse responds and ensures the closure of the relevant swing door, as for example in the prior art after US 6,250,015 B1 is described. In addition, in such a case, a locking element is transferred to the swing door in its locked state. For this purpose, the locking element is connected to a spring.

In a comparable safety cabinet according to the EP 0 170 337 A1 The procedure is such that a door closing mechanism is then actuated to act upon at least one door as soon as a temperature sensor detects an inadmissible increase in temperature near the safety cabinet. For this purpose, the door closing mechanism is usually not coupled to the door and only then provides for their admission, as soon as the temperature sensor responds.

In the further state of the art according to the DE 35 27 287 A1 An automatic locking system for fireproof cabinets is described. This consists of an electromagnetically lockable door closer and an automatic locking mechanism. In case of danger, the door closer pulls the door closed, at the end of which the automatic locking mechanism engages and locks the door. The lock can be lifted by hand via a locking mechanism again.

The state of the art has basically proven itself when it comes to provide for an automatic door lock a security cabinet in case of fire. However, the previous solutions work practically predominantly and exclusively purely mechanically.

In the further state of the art after the generic DE 10 2015 100 532 U1 Although an electronic sensor and a control unit are realized. The sensor for the delivery and transmission of the sensor signals to the control unit is such, which by a Exhaust air line measures the amount of air flowing. In conjunction with a ventilation arrangement, the amount of air extracted from the inside of the cabinet body can be controlled by means of the control unit.

In recent times, safety cabinets are increasingly being used for storage of batteries and in particular high-performance batteries such as lithium-ion batteries. That is, in the relevant security cabinet is preferably a battery cabinet. For such battery cabinets exist in the prior art according to the DE 101 14 960 C1 already role models to realize a heat transfer device for temperature control of the housing interior to a predetermined temperature level. As a result, the housing interior is to be kept in a given temperature range even with large temperature fluctuations.

The handling of batteries and in particular high-performance batteries such as lithium-ion batteries may be problematic. This can essentially be attributed to the fact that such batteries can have a short circuit in one or more battery cells during the charging process and even during storage. Such a short circuit can also occur by itself and without warning. This is all the more explosive, as typically several lithium-ion battery cells are connected to form a battery module.

This so-called overload behavior of such lithium-ion battery cells or the finished-connected lithium-ion batteries or else the battery module has proven to be critical in practice. In addition, the problem increases significantly with the growing use of such batteries. In fact, charging beyond the maximum allowable voltage can cause damage to the battery cell to a so-called "runaway" of the battery cell. As a result of this Sometimes explosions of the associated battery cell are observed. Depending on the voltage level, such a short circuit can also cause an arc and consequently a fire. This is possible even with charged lithium-ion batteries and without external influence in the storage state.

The invention is based on the technical problem of further developing such a safety cabinet in such a way that fires that arise, especially in the interior of the cabinet, are controlled simply and reliably.

To solve this technical problem, a generic safety cabinet in the invention is characterized in that derived from the sensor signals of the cabinet body and connected to the control unit sensor when exceeding at least one threshold and / or limit temporal gradient of a closing signal and closing the door is implemented.

In the context of the invention, therefore, initially at least one electronic sensor arranged in the cabinet body is used. The sensor signals generated by the electronic sensor in question are evaluated by the control unit. Any mechanical solutions as in the prior art after DE 35 27 287 A1 or according to the EP 0 170 337 A1 are therefore expressly not implemented.

By resorting to the electronic sensor and the corresponding sensor signals generated thereby, a very specific evaluation of the respective sensor signal by the control unit can take place. That's how it works relevant sensor signal of the sensor are evaluated as to whether at least one threshold is exceeded. If the sensor in question is an example of and advantageous for a temperature sensor, then the threshold in question corresponds to a limit temperature. As soon as this limit temperature inside the cabinet body has been exceeded, the control unit derives the closing signal as a result of this and in turn ensures that the door of the cabinet body is closed, or - if it is already closed - remains closed. In addition, the door may be locked.

In this way, it is ensured that the safety cabinet according to the invention and preferably battery cabinet is closed in any case or remains closed, for example, if a fire develops inside, which corresponds in the present case that the sensor designed as a temperature sensor exceeds the previously set limit temperature ,

In principle, it is also possible to work with several threshold values at this point. That is, as soon as the sensor signal in question exceeds, for example, a first limit value and then a second limit value or a first limit temperature and then a second limit temperature, this is interpreted as a closing signal by the control unit. This closing signal can be evaluated such that the control unit acts on a door closing mechanism in the presence of the closing signal. The door closing mechanism in turn ensures that the cabinet door or the multiple cabinet doors are closed. Of course, the relevant door or cabinet door remains closed in the event that it has already taken this state in the presence of the closing signal. Then the door closing mechanism practically ensures additional locking of the door or the cabinet door.

An even more accurate and more targeted evaluation of the sensor signal is observed in the event that, alternatively or in addition to the exceeding of the at least one threshold value, the exceeding of a limit value of temporal gradients is interpreted by the control unit as the closing signal. In this case, temporal changes of the respective sensor signal, ie temporal gradients, are evaluated. As soon as the resulting respective temporal gradients or gradients of the sensor signal over the time exceed a certain and previously set limit value, the closing signal is derived therefrom. For example, it is conceivable that the sensor signal increases by 20% or even more within 10 seconds. In the example case, this indicates a developing short circuit of a lithium-ion battery inside the safety cabinet.

In order that a fire source arising as a result does not spread to the outside of the safety cabinet, the sensor signal in question or its temporal increase in the described example case causes the control unit to exceed the limit value for the gradient (more than 20% increase of the sensor signal within 10 Seconds) derives the closing signal. As soon as the closing signal is present, the control unit acts on the door closing mechanism as described. As a result, the closet door assigned to the cabinet body is closed early and prevents a fire occurring inside the safety cabinet from ever reaching out to the outside. Perhaps the fire can also be "suffocated" by closing the closet door.

According to an advantageous embodiment, the control unit acts in the presence of the closing signal not only the door closing mechanism, but optionally also an exhaust air unit. That is, in this case, the closing signal is interpreted to the effect that not only any resulting in the interior of the safety cabinet fire must be sealed to the outside, but at the same time an optionally additional exhaust unit is applied to dissipate inside the safety cabinet resulting vapors. This can be done in addition to acting on the door closing mechanism.

According to a further variant of the invention with particular importance is provided that the cabinet body is divided in the interior in at least two segments, each with associated sensor. The respective segment may be a transverse segment. In this context, it has further proven, if several pull-out drawers and / or extendable shelves are provided for segmenting the cabinet interior in the interior of the cabinet body. In this case, a transverse segmentation generally takes place, although, of course, a longitudinal segmentation or a both longitudinal and transverse segmentation of the cabinet interior or its cabinet body is possible and is encompassed by the invention.

The invention is based entirely on the recognition that a trained example as a battery cabinet security cabinet is typically equipped in its interior with several extendable drawers and / or shelves to the individual batteries, especially lithium-ion batteries in the respective drawers or on stockpile the shelves. Thus, in such a case accurately a possibly resulting fire can be determined, each transverse segment in the example, a respective sensor is assigned. Is the sensor one? Temperature sensor, it detects an increase in the temperature inside the cabinet body, and separately for the respective transverse segment.

As a result, the safety cabinet according to the invention can not only respond to only locally occurring future sources of fire in advance, but the potential source of fire can also be localized in this way. Because depending on the respective transverse segment, the sensor has led to a closing signal from the control unit, the fire can be found locally in the interior of the cabinet body and, for example, play graphically on a screen connected to the control unit. The overall design is such that the control unit initiates the door closure as soon as the sensor signals of only one of the sensors are interpreted by the control unit as the closing signal.

That is, the control unit evaluates the individual sensor signals of the sensors associated with the segments with regard to exceeding at least one threshold value and / or a limit value of temporal gradients in the sense of an "OR" operation. As soon as at least one of the sensors or the sensor signals generated by it meet the criterion that the threshold value is exceeded and / or the predetermined limit of temporal gradients of the sensor signal, this is interpreted by the control unit as a total closing signal. As described above, the control unit acts on the presence of the relevant closing signal the door closing mechanism and optionally the exhaust air unit. The "OR" connection of the individual sensor signals of the sensors in the respective segments ensures that, in the example case, any local temperature violation already leads to the door closing. Of course, this is especially true in the event that several local temperature exceedances are detected.

In order to properly detect the individual segments inside the cabinet body with the aid of the associated sensors, the sensors in question are advantageously each connected to the inside of the cabinet body. As already explained, the sensor is advantageously a temperature sensor. In principle, the sensor can alternatively or additionally also be designed as a smoke, gas and / or vapor sensor. In this case, excessive smoke, gas or vapor developments are detected by the sensor inside the cabinet body and - as with the temperature sensor - lead to a closing signal.

Alternatively or additionally, the sensor may also be a leakage sensor. In this case, the sensor comprises any leaks, for example, from stored in the interior of the cabinet carcass hazardous substance containers. Once the leakage exceeds a certain threshold, this is again interpreted by the control unit as a closing signal and causes the control unit acts on the door closing mechanism. Finally, the sensor can basically also be designed as a door closing sensor. In this case, the sensor monitors alternatively or additionally the functional state of the cabinet door, namely to the extent that it is open or closed relative to the cabinet body. In this case, each opened against the cabinet body position of the cabinet door is interpreted by the door closing sensor or the control unit to the effect that a closing signal results, which causes the door closure.

The door closing mechanism is usually equipped in detail with an automatic door closer. The automatic door closer is triggered in the presence of a closing signal. For this purpose, the Door closing mechanism via at least one electromagnet acted upon by the control unit. The solenoid holds the cabinet door indirectly or directly against the force of a spring in the open position.

Finally, the door closing mechanism is advantageously equipped with a locking element. The locking element is consistently held in its unlocked position. Only with a closing signal does the locking element assume its locked position. This can be done spring-assisted. As a result, a safety cabinet and in particular a battery cabinet is provided, which is predestined for the storage of lithium-ion batteries. In particular, self-ignition or fires associated with the storage of such batteries are controlled effectively and automatically. For this purpose, the safety cabinet according to the invention evaluates signals of a single or a plurality of sensors present in the interior of the cabinet body, and in particular temperature sensors.

If the sensor signals emitted by the relevant sensor exceed a predetermined limit value or have an abnormal slope of their signal over time, this is interpreted as a closing signal by the control unit as a whole. The closing signal causes the control unit to act on a door closing mechanism.

As a consequence of this, even the creation of any local source of fire inside the cabinet body ensures that the associated cabinet door is properly closed. As a result, the invention ensures that a fire inside the cabinet body can not spread to the outside. This achieves a huge gain in security. Here are the main benefits.

Fig.1

einen erfindungsgemäßen Sicherheitsschrank in einer perspektivischen Darstellung,

Fig. 2

den Sicherheitsschrank schematisch in einer abgewandelten Ausführungsform mit segmentiertem Innenraum,

Fig. 3

den Türschließmechanismus in einer Übersicht und

Fig. 4

eine Übersichtsdarstellung mehrerer Sicherheitsschränke nach der Erfindung.

In the following the invention will be explained in more detail with reference to a drawing showing only one exemplary embodiment; show it:

Fig.1

a safety cabinet according to the invention in a perspective view,

Fig. 2

the safety cabinet schematically in a modified embodiment with segmented interior,

Fig. 3

the door closing mechanism in an overview and

Fig. 4

an overview of several safety cabinets according to the invention.

In the figures, a safety cabinet is shown, which is designed in this case and not restrictive as a battery cabinet and for storing only in the Fig. 1 indicated batteries. The batteries 1 are carried on the one hand by a tray 2 and on the other hand received in a drawer 3. The tray 2 and the drawer 3 can each be removed from a cabinet body 4 with the doors open 5 to seize individual batteries located on it 1 or put it off for storage. Of course, this is only an example.

The two doors or cabinet doors 5 are hinged doors or cabinet doors 5, which are rotatably connected to the cabinet body 4. In addition, the two swing doors 5 are connected in the exemplary embodiment and not restrictive to a common connecting element 7 via push rods 6 articulated. This can be seen by comparing the FIGS. 1 and 3 , The common connecting element 7 for the swing doors 5 is guided by means of a rail 8 in the interior of the cabinet body 4.

With closed cabinet doors 5 or swing doors, the common connecting element 7 assumes its retracted position relative to the rail 8. In this withdrawn position is one in the Fig. 3 to be recognized spring 9 relaxes. The spring 9 extends as an example along the rail 8. However, take the cabinet doors or swing doors 5 their open position, so the spring 9 is tensioned.

Thus, the open position of the cabinet doors 5 can be taken and maintained, at least one solenoid 10 is provided in the embodiment. In fact, according to the embodiment, two electromagnets 10 are realized on both sides of the rail 8 and on the head side in the interior of the cabinet body 4. With the aid of the electromagnet 10, the connecting element 7 is held in the open position of the two cabinet doors 5. For this purpose, the two electromagnets 10 are applied in the example case by means of a control unit 11. The spring 9 is stretched.

To close the cabinet doors 5, it is only necessary to end the energization of the electromagnet 10. As a result, the two electromagnets 10 release the previously magnetically attracted common connecting element 7 made of a metal, in particular magnetizable steel, so that the connecting element 7 is transferred to its retracted position, in that the spring 9, previously tensioned along the rail 8, relaxes. As a result, the two cabinet doors 5 are automatically transferred from their open position to the closed position. In this respect, a door closing mechanism 6, 7, 8, 9, 10, 12 realized at this point, consisting of the two push rods 6 for the cabinet doors 5, the common Connecting element 7, the rail 8 for the leadership of the connecting element 7, the spring 9 and finally the one or both electromagnets 10 composed, which in turn are acted upon by the control unit 11.

In addition, the door closing mechanism 6, 7, 8, 9, 10, 12 assigned in the embodiment, a locking element 12, which is consistently held in its unlocked position and occupies its locked position only in a closing signal to be explained below. The locking element 12 is in the embodiment and evidenced by a comparison of FIGS. 1 and 3 formed as a locking pin, which is held by the control unit 11 throughout in its unlocked position, that is retracted relative to the cabinet body 4. Only when the control unit 11 generates a closing signal, the locking element 12 is transferred to its locked and exposed position relative to the cabinet body 4. In the locked or exposed position, the locking element 12 engages respectively the locking pin in a respective both cabinet doors 5 and ensures that they are locked against the cabinet body 4 and can not be opened.

As an integral part of the door closing mechanism 6, 7, 8, 9, 10, 12 is also an automatic door closer 7, 8, 9 realized, which is triggered in the previously mentioned closing signal from the control unit 11. The door closer 7, 8, 9 is composed of the connecting element 7, the rail 8 and the spring 9 together. In addition, the door closing mechanism 6, 7, 8, 9, 10, 12 has the previously mentioned at least one electromagnet 10 acted on by the control unit 11. The solenoid 10 holds the associated cabinet door 5 against the force of the spring 9 in the open position.

Coming back to Fig. 1 belongs to the basic and essential structure nor a connected to the cabinet body 4 and communicating with the interior of which exhaust air unit 13, 14. The control unit 11 is present and protected arranged on the head side of the cabinet body 4 and connected to this. In addition, the exhaust air unit 13, 14 is acted upon by the control unit 11 if necessary. In addition, the at least one locking element 12 is connected to the control unit 11. Likewise, at least one or the two electromagnets 10 are connected or coupled to the control unit 11. This can be seen by comparing the FIGS. 1 and 3 ,

Of particular inventive importance is now at least one arranged in the cabinet body 4 sensor 15. In particular, based on the overview in the Fig. 2 it can be seen that in the exemplary embodiment, three sensors 15 each connected to the cabinet body 4 on the inside are realized. The sensors 15 are in the exemplary embodiment and not limited to each temperature sensors. In addition, the presentation in the Fig. 2 clearly that the cabinet body 4 is divided inside in at least two segments, in this case in a total of three segments 4 ₁ , 4 ₂ and 4 ₃ , each with associated sensor 15. The subdivision of the cabinet body 4 in the aforementioned segments or transverse segments 4 ₁ , 4 ₂ and 4 ₃ follows essentially the arrangement and the attachment of respective drawers 3 inside the cabinet body 4, each for receiving one or more batteries 1 in the example are furnished and designed. Instead of the drawers 3, alternatively or additionally, of course, shelves 2 can also be realized and implemented in this context.

The sensor signals generated by the respective sensors 15 are evaluated by the control unit 11 for door closing. This is schematic and exemplary in the Fig. 2 illustrated by a diagram reproduced there. It can be seen that the sensor signal of the sensor 15 or a current I corresponding thereto fluctuates over time t. In particular, the diagram makes it clear that, starting at a time t _1, the time-dependent sensor signal I (t) exceeds a limit value G of a time gradient indicated in the illustration. In other words, the limit value G of the temporal gradient indicates a specific slope of the sensor signal I (t) over time t. As soon as the measured sensor signal I (t) exceeds the gradient in question and associated with the limit value G, within the scope of the invention, a closing signal is derived and generated by the control unit 11, which evaluates the sensor signals of the relevant sensor 15. The closing signal generated in this way within the control unit 11 is converted to the door closure of the one or more cabinet doors 5, as will be described in more detail below.

As an alternative or in addition to the evaluation of time derivatives of the sensor signal I (t), one or more threshold values S or exceeding thereof by the control unit 11 can be quite simply interpreted as a closing signal. This is likewise reproduced in the diagram in the form of a threshold value S indicated by dashed lines, which corresponds to a predetermined absolute value of the sensor signal I (t). In principle, of course, both methods can be combined. In this case, for example, the exceeding of a limit value G for the time gradient and additionally a threshold value S for the absolute value of the sensor signal I (t) leads to the fact that the control unit 11 derives the already mentioned closing signal. Either way, the closing signal generated by the control unit 11 is implemented to close the door. For this purpose, the Control unit 11 with the door closing mechanism 6, 7, 8, 9, 10, 12 connected to the door closing mechanism 6, 7, 8, 9, 10, 12 in the presence of the closing signal in that the relevant cabinet door 5 is closed. In the exemplary embodiment, the presence of the closing signal in the control unit 11 additionally leads to the control unit 11 also acting on the exhaust air unit 13, 14.

As a consequence, a potential source of fire locally inside the cabinet body 4 already not only causes the two cabinet doors 5 to be closed in the example case with the aid of the door closing mechanism 6, 7, 8, 9, 10, 12, but also results in the application of the same the exhaust unit 13, 14, in order to dissipate vapors or gases arising from the interior of the cabinet body 4 as comprehensively and accurately as possible when the fire source occurs. In addition, due to the described segmentation of the interior of the cabinet body 4, the possible source of fire can be localized and assigned to the associated segment 4 ₁ , 4 ₂ , 4 ₃ and made visible, for example, with the aid of a display unit connected to the control unit 11.

Because the individual sensors 15 are evaluated by the control unit 11 so that the control unit 11 causes the door lock described as soon as the sensor signals of only one of the sensors is interpreted by the control unit 11 as a closing signal. Thus, as soon as the sensor signal of one of the three sensors 15 in the example exceeds the threshold value G of the temporal gradient or the threshold value S as shown in the diagram and consequently the control unit 11 derives the closing signal, this is sufficient overall to close the safety cabinet and the door closing mechanism 6, 7, 8, 9, 10, 12 to act on the part of the control unit 11.

In this connection, the locking element or the locking pin 12 is consistently held in its unlocked position, thus in the retracted position relative to the cabinet body 4. The two cabinet doors 5 can be easily opened and closed in this unlocked position of the locking element 12. However, if the closing signal is detected and generated by the control unit 11 after interrogation of the sensor signals of the one or more sensors 15, then the locking element 12 assumes its locked position. This can be done in such a way that the control unit 11 holds the locking element or the locking pin 12 by motor in its unlocked position. As soon as the closing signal is emitted and generated by the control unit 11, the motoring of the locking element 12 is eliminated, which as a consequence thereof assumes its locked position. As a result, the cabinet doors 5 experience a quasi double backup.

If the cabinet doors 5 are open when generating the closing signal in the control unit 11, the closing signal ensures that the control unit 11 acts on the door closing mechanism 6, 7, 8, 9, 10, 12 for closing the two cabinet doors 5. Subsequently or at the same time, the control unit 11 acts on the locking element 12 in such a way that it assumes its locked position. As a result, the two cabinet doors 5 are not only closed, but additionally locked. If the two cabinet doors 5 are already closed when the closing signal in the control unit 11 is generated, the locking element 12 ensures in this case that the already closed cabinet doors 5 are locked in the control unit 11 when the closing signal occurs.

Either way, the safety cabinet according to the invention is automatically closed consistently when a fire occurs inside. In addition, the two cabinet doors 5 are locked in the example described also still opposite the cabinet body 4. Of course, this is an option that is not mandatory. At the same time, the control unit 11 acts on the exhaust air unit 13, 14, so that any vapors arising in the interior of the cabinet carcass 4 are reliably sucked off as a result of the fire. As a result, the overall security is increased enormously.

Claims (15)

Safety cabinet, in particular fire protection cabinet for holding hazardous substances, preferably battery cabinet for receiving and storing high-performance batteries such as lithium-ion batteries, with a cabinet body (4) and at least one cabinet door (5) connected to or interacting with the cabinet body (4), and with at least one in the cabinet body (4) arranged sensor (15) whose sensor signals are evaluated by a control unit (11), characterized in that from the sensor signals when exceeding at least one threshold (S) and / or a limit (G) temporal gradient of the control unit (11) a closing signal derived and implemented for door closing. Safety cabinet according to claim 1, characterized in that the cabinet body (4) is divided in the interior into at least two segments (4 ₁ , 4 ₂ , 4 ₃ ) each with associated sensor (15). Safety cabinet according to claim 2, characterized in that the segments (4 ₁ , 4 ₂ , 4 ₃ ) are designed as transverse segments. Safety cabinet according to claim 2 or 3, characterized in that the sensor signals of the respective sensors (15) are evaluated by the control unit (11) for door closing. Safety cabinet according to one of claims 2 to 4, characterized in that the control unit (11) causes the door closure as soon as the sensor signals of one of the sensors (15) are interpreted by the control unit (11) as a closing signal. Safety cabinet according to one of claims 1 to 5, characterized in that the at least one sensor (15) is connected on the inside to the cabinet body (4). Safety cabinet according to one of claims 1 to 6, characterized in that the sensor (15) is designed as a temperature sensor. Safety cabinet according to one of claims 1 to 7, characterized in that the sensor (15) is designed as a smoke, gas and / or vapor sensor. Safety cabinet according to one of claims 1 to 8, characterized in that the sensor (15) is designed as a leakage sensor, Safety cabinet according to one of claims 1 to 9, characterized in that the sensor (15) is designed as a door closing sensor. Safety cabinet according to one of claims 1 to 10, characterized in that a plurality of extendable drawers (3) and / or shelves (2) are provided for segmenting the cabinet interior. Safety cabinet according to one of claims 1 to 11, characterized in that the control unit (11) in the presence of the closing signal a door closing mechanism (6, 7, 8, 9, 10, 12) and optionally an exhaust air unit (13, 14) acted upon, Safety cabinet according to claim 12, characterized in that the door closing mechanism (6, 7, 8, 9, 10, 12) has a locking element (12). which is consistently held in its unlocked position and occupies its locked position only at a closing signal. Safety cabinet according to claim 12 or 13, characterized in that the door closing mechanism (6, 7, 8, 9, 10, 12) has an automatic door closer (7, 8, 9), which is triggered at a closing signal. Safety cabinet according to one of claims 12 to 14, characterized in that the door closing mechanism (6, 7, 8, 9, 10, 12) at least one of the control unit (11) acted upon electromagnet (10), which the cabinet door (5) against the force of a spring (9) holds in the open position.

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