Field of the Invention

The present invention concerns a scalable cabin system for spot processing of a surface, a mobile cabin, application hereof along with a method for spot processing of an area of a surface, preferably on a car or other objects.

Background of the Invention

The present invention is developed in connection with surface processing, including surface treatment of a lesser or outlined area of a larger surface. Such a type of pro- cessing is referred to as spot treatment or spot processing.

Until now, spot processing or -treatment such as spot painting of even smaller areas on a car, such as a bumper, door, wing, or similar, has occupied a paint cabin. The car is placed in the paint cabin, and areas that are not to be painted are covered up, while the smaller area that is to be painted undergoes spot painting. Throughout this procedure, the person cartying out the painting will stay inside the paint cabin and must wear safety equipment. The same method is employed for polishing and welding and similar spot processing.

The car thus occupies a full-sized cabin, and it is therefore, with regards to capacity, difficult to have a car undergo treatment in a traditional cabin for the purpose of repair- ing minor damages.

This has meant that spot processing often happens with a delay. Furthermore, such cases of spot processing become disproportionately expensive as they occupy an entire cabin, which could instead have processed an entire car. This is obviously a disadvantage, as there are typically numerous smaller damages that only require spot processing.

To utilise the capacity of traditional cabins there is a request for an alternative way of carrying out spot processing of surface parts on a car, where the use of a traditional cabin is not required. Object of the Invention

An object of the present invention is to indicate a mobile cabin and a method for use of the mobile cabin for spot processing, and which can easily and effectively be utilised in connection with cars or other objects where only a part of the surface is to be processed.

A further object of the invention is to indicate a scalable cabin system comprising the mobile cabin, likewise for spot processing. It furthermore an object to indicate applica- tion and method for use of the cabin system for spot processing.

Description of the Invention

According to the present invention this is accomplished with a mobile cabin of the in- troductory mentioned type, characterised in that it comprises

- a cabin with sides, bottom, and top, where a first side is open and where a covering sheet made from a flexible material is assembled along an outlined edge area facing the open side, which can be brought into arrangement against a surface, where a smaller area of the surface is to undergo spot processing, which covering sheet at its free edge area has an edge area supplied with sealing compounds adapted to establish a sealing arrangement against the surface, which envelops the smaller area which is to undergo spot processing, and where the other sides compri se sidewalls,

- air inlet,

- cabin air extraction, adapted to be linked to an extraction system,

- wheels, which facilitates easy relocation of the cabin,

- windows, provided in at least one of the other sidewalls for visual insight into the cabin,

- arm access holes, provided in one or more of the other sidewalls and supplied with flexible material for a tight fit around a person's arms when standing outside of the cabin.

Cabin air intake can advantageously be arranged in the upper part of the cabin and the cabin air extraction in the lower part of the cabin, so that a d ownwards directed air flow is achieved inside the cabin. Thus, the generated air flow will follow and reinforce that surplus material from or waste material generated in connection with the processing will fall to the bottom, so that the area which is to undergo spot treatment is not con- taminated. The method according to the invention characterised in that the method comprises steps for

- providing the mobile cabin as per the embodiments described herein,

- placement of the cabin close to object which is to undergo spot processing with the open side oriented towards the object,

- covering of the area between the object and the cabin's outlined edge area towards the open side,

- linking the cabin air extraction to an extraction system,

- activation of the cabin air extraction,

- provide a processing unit inside the cabin,

- a person guides the arms through the arm access holes and performs, in a standing or sitting position outside the cabin, a processing inside the cabin of the area, which is to undergo spot processing, while the person simultaneously has visual control of the spot processing through one or more windows.

The cabin according to the invention is a simple construction which can easily be placed inside workshops with limited requirements for air extraction and similar, as it is known from traditional cabins, wherein an object, a car for instance, is placed inside the cabin during the processing.

When in use, the cabin constitutes a closed cabin where the surface which is to undergo processing both constitutes a side of the cabin and simultaneously is available for pro- cessing inside the cabin. A cabin which can be operated from the outside.

In this description the covering and shielding likewise comprise masking and sealing.

In the following description, the expression “a smaller area” refers to an outlined area or subarea of a surface.

The cabin air intake can advantageously facilitate a filtrated air intake. This can be achieved by the cabin air intake comprising a particle filter. The technical effect achieved with the invention is easy and effective spot processing of surface parts with limited space requirements and with reduced extraction, as well as an environmental benefit, in that the person who oversees the processing, is not required to stay inside the cabin itself.

In principle, the mobile cabin will, in its construction, consist of the area which is en- cased by bottom, top, sides, as well as the covering sheet. When in use, the cabin thus makes up a closed cabin.

Due to its flexibility the covering sheet can accommodate different forms of surfaces and will therefore, with ease, be able to be placed into sealing arrangement against the surface of a car for instance. In a traditional manner, this can be done by taping the covering sheet on to the car's surface. Likewise, the covering sheet can be taped on to the outlined edge area on the cabin. The covering sheet can thus easily be replaced and substituted with a new covering sheet. Alternatively, the covering sheet can be assem- bled more firmly on the cabin's outlined edge area, so that it can be reused several times. In such a case, the fastening can be achieved with for example clamp rails which fastens an edge area on the covering sheet.

The covering sheet can be manufactured from different suitable materials for a given application, such as plastic.

The covering sheet can be supplied with channels which can contain bracing tubes, such as it is known from tents as an example. Thus, the covering sheet can in an easy manner maintain a stretched condition, which eases the assembly on to the item that is to un- dergo spot processing.

Bottom plate, sidewalls, and top plate are preferentially embodied as fixed parts and mounted together, so that they establish an airtight unit. When in use, the cabin wall thus be operated with an airflow through the cabin from the cabin's air intake to its air ex- traction and with a vacuum, so that emissions from the cabin itself and into its surround- ings do not occur. Moreover, the cabin's air intake will take place through the cabin's air inlet so that a controlled airflow inside the cabin is achieved. By providing the cabin with windows, the person standing outside the cabin will be able to conduct a spot processing and simultaneously receive visual information regarding the execution of the work. By having the person placed outside the cabin, there is no need for respiratory protection or the like. The person's arms, which are led through the arm access holes, will be in close arrangement with the flexible material. This can for example be elastic cuffs with a star-shaped opening, which ensures both a close fit around the user's arms and at the same time avoid that a bothersome or restraining in- fluence on the execution of the work. Alternatively, the user's arms can be covered with elongated bag-shaped gloves, so that the arras, which are inside the cabin, are covered by these bag-shaped gloves. As a result, the person performing the work will not get into contact with materials, fumes, sparks, or other diverted material /phenomena, that are either released or occur in connection with the spot processing.

The extraction happens in a traditional manner, with the cabin being connected to an extraction system. This can preferably take place through a flexible tube. Alternatively, the cabin air extraction can be provided at the bottom of the cabin between a perforated plate and a sealed bottom plate, producing a chamber. This chamber can then be pro- vided with a flexible hose which leads the air into a traditional extraction system, which can be placed at a distance from the cabin and ensure that the extracted air is handled in accordance with environmental requirements.

Once the spot processing has been carried out, the cabin can easily be detached from the item/car and transported away, as it is supplied with wheels. The wheels enable an easy relocation of the cabin, so that it can easily and quickly be taken to another item or car, which is to undergo processing. Alternatively, the cabin can be moved to a desig- nated area in a workshop, where it will take up very little space when not in use.

The wheels are thus adapted to displace the cabin on a horizontal foundation.

According to a further embodiment the cabin according to the invention is characterized in that the cabin air inlet comprises the opening in the upper part of the cabin, preferably in a top plate at the top of the cabin. In the cabin the cabin air inlet can solely be constituted by a perforated plate that is possibly provided with a filter element, and which is placed in the upper part of the cabin. Thereby, the air can be drawn in from the top in a traditional manner, which likewise applies to traditional cabins.

According to a further embodiment the according to the invention cabin ischaracterized in that the cabin air extraction is provided in the lower part of the cabin and comprises a flexible tube connected to the extraction system.

The cabin air extraction is advantageously provided in the lower part of the cabin like in traditional cabins. The cabin air extraction comprises a flexible tube which can con- nect the cabin to an extraction system. The extraction system can be a traditional system, such that there is no active extraction inside the cabin itself whereas a chamber between a perforated plate and a lowermost bottom in the cabin is created. Surplus material from or waste material generated in connection with the processing will fall to the bottom and thus the extraction will be more effective when performed at the bottom of the cabin.

According to a further embodiment the cabin according to the invention ischaracterized in that the cabin air extraction comprises openings in a bottom plate at the bottom of the cabin, and that a chamber beneath the bottom plate is connected to the flexible tube.

As mentioned above, it is advantageous that a chamber can be placed at the bottom of the cabin. If a bottom plate with openings is provided, a chamber will be created, whereto the flexible tube can be connected in order to perform an efficient extraction of polluted air from the cabin.

According to a further embodiment the cabin according to the invention ischaracterized in that at least one of the other sidewalls is curved and comprises a curved window.

As a result of the other sidewalls, which comprise the windows, being curved, the win- dows can likewise be curved. This enables a better view into the cabin, where a person performing the spot processing can observe the area undergoing treatment from multi- ple angles. According to a further embodiment the cabin according to the invention is characterized in that at least one of the other sidewalls comprises more sidewall parts, which are placed among themselves to establish several side surfaces in the cabin.

As an alternative to a curved sidewall, one of the other sidewalls can be formed from more sidewall parts. These sidewall parts can be flat or curved. By providing more side- wall parts, placed under an angle in relation to each other, a multiangular outline of the cabin is achieved, which facilitates an inspection of the area that us to undergo treatment from multiple angles.

According to a further embodiment the cabin according to the invention is characterized in that several of the sidewall parts are supplied with windows.

When several sidewall parts are provi ded, it is advantageous that several of these side- wall parts are supplied with windows to ensure a view of the area which is to undergo treatment from multiple angles.

According to a further embodiment the cabin according to the invention is characterised in that the covering sheet is assembled on the outlined edge area with tape, and that the sealing means at the covering sheet's free edge area comprise tape.

As mentioned earlier, tape is an expedient way to fasten the covering sheet to the out- lined edge area, just as it is an expedient sealing compound and fastening compound against the surface which is to undergo treatment/processing. As mentioned above, the covering sheet does not have to be assembled with tape to the item as well as at the free edge area on the cabin.

For example, by utilising tape, a shielding which by and large corresponds to traditional shielding of an area, which is used in traditional spot painting, is achieved.

Shielding comprises demasking, sealing, and covering. According to a further embodiment the cabin according to the invention is characterized in that a seat meant for the person performing the spot processing, is assembled at the cabin's exterior.

By placing a seat at the exterior, a comfortable position for a user performing the spot processing, is achieved. Thus, the person can adjust the seat in height and in distance from the cabin, so that a good view into the area that is to undergo processing is achieved, just as a good positioning for the person's placement in relation to the arm access holes can be achieved.

The purpose of the invention can be achieved through the use of the mobile cabin in accordance with the described embodiments for spot processing, where the spot pro- cessing relates to welding and where one or more windows in the cabin are designed in a material with this application in mind.

Advantageously, the windows can thus be designed from welding glass or another ma- terial with similar built-in safety parameters, where the cabin's user maintains a visual insight into the cabin.

The air extraction in the cabin can likewise advantageously be adapted to this applica- tion. Thus, it can further be ensured that fumes do not accumulate in the cabin, which hinders a view into the cabin during the work or which are released when the cabin is disconnected from the item undergoing treatment.

The purpose of the invention can be achieved by using the mobile cabin in accordance with the described embodiments for spot processing, where the spot processing con- cerns metal polishing and where the windows in the cabin are designed in a material with this application in mind.

The air extraction in the cabin can likewise advantageously be adapted to this applica- tion. Thus, it can further be ensured that metal dust does not appear in the cabin, which hinders a view into the cabin during the work or which is released when the cabin is disconnected from the item undergoing treatment. The windows can thus advantageously be designed with a scratch free surface on the side facing the cabin, or from a scratch free material, so that the user of the cabin is ensured a visual insight into the cabin, even after repeated use of the cabin.

The purpose of the invention can be achieved through the use of the mobile cabin in accordance with the described embodiments for spot treatment, where the spot treat- ment relates to painting, and where the air extraction in the cabin is adapted with this application in mind.

The cabin air extraction can advantageously be adjusted to ensure that toxic fumes do not accumulate inside the cabin, which are released when the cabin is disconnected from the item undergoing treatment.

Furthermore, the object of the invention according to the present invention is achieved with a cabin system for spot processing of an area on a surface, preferably a car or other objects, characterised in that the cabin system comprises a mobile cabin in accordance with one of the embodiments described above and a filter unit.

The cabin's air extraction is adapted to be connected to the filter unit.

The filter unit comprises air extraction, one or more filters, and one or more air inlets, and where each air inlet is adapted to connect to the mobile cabin, so that the filter unit is configured to be arranged in fluid communication with the mobile cabin.

The cabin system is a simple construction which can easily be placed in workshops with limited or no ventilation requirements or the like, such as it is known from traditional cabins where an item, such as a car, is placed inside the cabin during the processing.

The technical effect which is achieved with the cabin system is easy and effective spot processing of surface parts with limited space requirements and without access to fil- tered air extraction, or where the extraction capacity is limited. Furthermore, an envi- ronmental benefit can be achieved, in that the person carrying out the processing, is not required to stay inside the cabin itself. According to a further embodiment of the cabin system, the filter unit comprises wheels which enables easy relocation of the filter unit.

The portability of the filter unit has the same benefits as the portability of the cabin.

The already described technical effects and benefits achieved with a mobile cabin ac- cording to one of the described embodiments can, in general, also be achieved with the cabin system comprising a mobile cabin with the same embodiment. In the following, as a rule, the additional effects and benefits achieved with the cabin system are pre- sented.

According to a further embodiment of the cabin system, the mobile cabin's cabin air extraction and the filter unit's air inlet comprise tube connections configured for assem- bly of a tube-like connection between the mobile cabin and the filter unit.

In the cabin system, the extraction can take place by connecting the cabin to the filter unit through a flexible tube, which can be connected to the cabin's air extraction and an air inlet on the filter unit respectively.

The cabin air extracti on can be provi ded at the bottom of the cabin between a perforated plate and a sealed bottom plate, which produce a chamber. This chamber can then be provided with a flexible hose which leads the air to the filter unit.

By using a flexible hose or tube, the filter unit can be placed at a given distance from the cabin so that the workplace's layout can be optimised. Likewise, it can be assured that the extracted air is handled in accordance with environmental requirements.

According to a further embodiment of the cabin system, the filter unit comprises a ven- tilator assembled in connection with the air extraction, so that an air flow through the cabin and/or the filter unit from the cabin's cabin air inlet or from the filter unit's air inlet to the filter unit's air extraction is achieved.

By arranging the ventilator in connection with the air extraction in the cabin, the risk turbulence inside the cabin and thus risk of polluting the subject, which is to undergo spot processing, is reduced. Likewise, a smaller vacuum inside the chamber is created, which can be an advantage in securing better sealing between the subject and the cov- ering sheet.

The same effect within the filter unit can secure a more laminar airflow through the filters, which can be advantageous in order to utilise the filter in an optimal manner.

The filter unit can advantageously comprise several inlets and/or several filters, so that the filter unit can be adjusted for a specific application. Alternatively, the filter unit with multiple inlets can be adjusted to several uses by connecting a given filter to a specific inlet, where the filter is configured for a specific application.

According to a further embodiment of the cabin system the filter unit comprises an ac- tivated carbon filter.

In one embodiment, the filter or one of the filters can be constituted by a high energy activated carbon filter with a plurality of filter bags, so that it also functions as a particle filter.

According to a further embodiment the filter unit comprises a VOC-sensor arranged after the filters and in connection with the air extraction for measuring of transient or- ganic connections in the air flow out of the filter unit's air extraction. The VOC-sensor is configured to emit a sensor signal, indicating a level of the amount of VOC in the air flow.

The cabin system in this embodiment can likewise comprise a control configured to receive the sensor signal from the VOC-sensor and configured to emit an alarm signal as a function of the measured VOC-level.

Alternatively, the filter unit comprises a plurality of sensors or other types of sensors for measuring other parameters, such as air velocity, particle content, and so on.

By monitoring the VOC-level in the air extraction the cabin system can advantageously be operated with a control to emit a tactile alarm and/or cut off the power supply to processing units that are in use and that can cause an increased VOC-level. Alternatively, when for example using a sensor to measure the air velocity, the control can give off a signal on whether there is a risk of explosion, if the air replacement inside the cabin is too low. This could, for example, be caused by blockage of the fluid con- nection between the cabin and the filter unit, blocked filters, and so on.

The tactile alarm could be in the form of a visual and/or auditor}' indicator.

.According to a further embodiment the cabin system comprises one or more mobile cabins and one or more filter units, where the filter units comprise one or more air inlets so that a scalable cabin system is achieved.

Furthermore, the object of the invention according to the present invention is achieved with a method for spot processing in accordance with one of the embodiments described above, by providing a cabin system according to one of the embodiments described above, and where the cabin's cabin air extraction is connected to a filter unit.

The scalable cabin system can advantageously, be adjusted to multiple uses by adjusting the cabins for use in a specific type of spot processing and connecting the cabin to a filter unit, where the filter is configured to the corresponding use. This could, for in- stance, be for a cabin for “clean” use, for example painting or lacquering, and a filter unit with an activated carbon filter for cleaning the extraction air from the system of volatile organic compounds (VOC).

The object of the invention can furthermore be achieved through use of the cabin system in accordance with the described embodiments for spot processing, where the spot pro- cessing relates to welding, metal polishing, cutting, and/or painting.

Description of the Drawings

The invention will hereafter be described with reference to the accompanying schematic drawing, wherein Fig. 1 illustrates a side image of a cabin according to the invention, where the cover- ing sheet is shown in a partially stretched condition for illustrating contact with an irregular surface,

Fig. 2 illustrates an image of the cabin in fig. 1 viewed from the right in fig. 1,

Fig. 3 illustrates an image of the in fig. 1 illustrated cabin viewed from above, but here without covering sheet,

Fig. 4 illustrates a first perspective image of the cabin viewed from the front.

Fig. 5 illustrates a second perspective image of the cabin viewed from behind, look- ing into the cabin,

Fig. 6 illustrates a first perspective image corresponding to fig. 4 of a further embod- iment of the cabin viewed from the front,

Fig. 7 illustrates a second perspective image corresponding to fig. 5 of the embodi- ment illustrated in fig. 6 viewed from behind, looking into the cabin,

Fig. 8 illustrates a first perspective image of a further embodiment for the cabin viewed from the side in a sectional view through the cabin,

Fig. 9 illustrates a second perspective image of the embodiment shown in fig. 8 viewed from the front, showing the cabin from the user's position,

Fig. 10 illustrates a perspective image of a filter unit according to the invention, where the filters contained within the filter unit appear, and

Fig. 11 illustrates a perspective image of a further embodiment of the filter unit with a cover plate assembled over the filters and a filtering wall.

Detailed Description of the Invention

In the different figures the same part will be provided with an identical reference desig- nation, and an explanation in connection with all construction details will thus not be provided with each individual figure.

Fig. 1-3 illustrate a schematic image of a cabin 1. This is meant for spot processing of smaller areas on a surface of a car (not shown) or other objects.

The cabin 1 is provided with a first side 2, where a flexible covering sheet 4 is fastened along an outlined edge area 3. The flexible covering sheet 4 can be brought into ar- rangement against the surface that is to undergo a spot processing. The covering sheet 4 is at its free edge area 5 supplied with sealing compounds in the form of tape 5', which can establish a sealing arrangement against the surface. Thus, an area 6, which contains a smaller area that is to undergo spot processing on its surface, is enveloped.

The cabin comprises other sides 14 as well as a top 7 and a bottom 8. At the bottom 8, wheels 9 are assembled for easy transportation of the cabin, as indicated at the arrow 10. The sides 14 comprise other sidewalls 14'. At the top 7 there is a top plate 22 (see fig. 4 and 5) provided with openings 23 (see fig. 4 and 5) to establish an air inlet 11 . At the bottom there is an air extraction 12 (see fig. 4 and 5), that via a flexible tube 13 is adapted to be connected to an extraction system (not shown).

In the other sidewalls 14', windows 15 are provided. The windows 15 make it possible for an operator standing outside of the cabin to monitor the work that is being performed with a processing unit inside the cabin. The other sidewalls 14' are likewise provided with arm access holes 16, which make it possible for the person to stand outside the cabin and hold the arms inside the area 6, where processing is taking place. The person can thus perform the work without the need for protective equipment.

As it particularly clearly appears in fig. 4, the arm access holes 16 are provided with a cuff 17 which has a star shaped opening 18, and which is made from a flexible material. It is thus easy for a user to lead the arm through the opening 18 and because of the flexible material of the cuff 17, a close fit around the user's arms is secured. As a result, there is no risk of polluted air escaping out through the openings 18.

At the cabin's front side 14 a seat 19 is assembled on the sidewall 14'. The seat is assembled on an arm 20, which enables a displacement of the seat 19 in a direction towards and away from the cabin's frontal sidewall 14'. The seat is assembled on a vertical spindle 21 which enables a height adjustment of the seat 19. Hereafter, a user can be seated and maintain a correct position in relation to the arm access holes 16 and the window 15 for visual inspection of the work being carried out inside the cabin.

In fig. 4 and 5 a magnified image with more details of the cabin illustrated in fig. 1-3 is seen. It is seen that a perforated top plate 22 with several openings 23 is situated at the top 7, which enables air inlet. In this plate a filter can be provided, but alternatively. there can merely be openings 23 which bring the inner area 6 into contact with the surrounding air to allow for free air inlet.

In fig. 5 it is seen that a cabin air extraction 12 is provided with a perforated bottom plate 12' wdth several openings 24. This brings the inner area 6 in connection to a cham- ber located beneath the bottom plate 12' and in a lowermost bottom plate 25 in the cabin. This chamber (not shown) is connected with the flexible tube 13.

In fig. 4 and 5 it is seen that the outlined edge area 3 is provided with fastening means in the form of clamp rails 26 which enables a close fit for the covering sheet to the outlined edge area 3. Shielding rails are only shown along the top plate 22 and the side- walls 14 .

In fig. 4 and 5 it is seen that the frontal sidewall 14' is made up of several sidewall parts 14” . These sidewall parts 14” are placed at a mutual angle, such that more side surfaces are formed inside the cabin. It is seen that windows 15 are provided in three of the sidewall parts 14”. Hereby, the user can inspect the inner portion of the cabin from several angles.

In fig. 6 and 7 an alternative embodiment for a cabin 1 is illustrated. The cabin 1 in this embodiment differentiates itself by not comprising a seat and that the sidewall 14' at the cabin's front is provided with a curved shape. The window 15 will likewise be curved in this embodiment. The curved window facilitates a visual inspection of the paintjob from several angles.

Alternatively, the frontal sidewall 14' can be flat and comprise a flat window 15.

In fig. 6 and 7 the flexible tube is omitted, though such a tube will also be provided for air extraction from the cabin, which is illustrated in fig. 6 and 7.

When the cabin's front is mentioned in the present application, this refers to the side on which the person who is performing the processing is placed. This means that the ex- pression “from behind” refers to the side of the cabin facing towards the item which is to undergo processing. In fig. 8 and 9 an alternative embodiment of a cabin 1 is illustrated. The cabin 1 in this embodiment differentiates itself by not comprising a seat and that the arm access holes 16 have a different design and placement. The illustrations in fig. 8 and 9 further illus- trate an example of how the cabin can be implemented with ventilator assembled in connection with the cabin air extraction, so that an air flow is achieved through the cabin from the cabin's air inlet and in through the opening 23 into the cabin's air extraction 12.

Fig. 9 further illustrates an embodiment of the cabin with tube connection configured for assembly of a tube-like connection between the mobile cabin and the filter unit, here the tube-like connection is illustrated by a flexible tube 13.

In fig. 10 and 11 two alternative embodiments for a filter unit 50 are illustrated. The filter units are configured to be assembled in fluid communication with the cabin 1 via the air extraction 54.

The filter units comprise one or more filters 52 which can be active, replaceable, and/or self-cleaning.

The filter units can be designed with filters suited for specific uses, for instance acti- vated carbon filters to clean the air of VOC- connections or particle filters, just to men- tion a few, though without limiting which filters can be used.

The illustrated embodiments likewise comprise air extraction 56 and in connection with both air inlet 54 and air extraction 56 a tube connection 28 is assembled. The tube con- nection at the air extraction 56 is not essential for the cabin system, as the extracted air is cleansed and thus can be led directly out in the environment, in which the cabin sys- tem is being used. Alternatively, the cabin system can be connected to an external ex- traction system. The filter system can comprise a ventilator assembled in connection with the air extraction 56, so that an air flow through the filter unit from the air inlet 54 and to the air extraction 56 is achieved. Alternatively, the filter unit can be connected to an external extraction system which generates the air flow. The filter unit in fig. 10 is illustrated with a sensor 60. In the illustrated embodiment, the sensor is arranged after the filters 52 and in connection with the air extraction 56. The sensor can be a VOC-sensor for measuring transient organic connections in the air flow out of the filter unit's air extraction. The sensor can, alternatively, be adapted to measure air velocity, particle content, or the like, in relation to the cabin system's in- tended application. Alternatively, the filter unit can comprise multiple sensors.

The sensor is configured to emit a sensor signal 62 which indicates a measurement value or level, for example a threshold for the amount of VOC in the air flow, a threshold for a minimum air flow, or the like.

Furthermore, the cabin system can comprise a control 70 configured to receive the sen- sor signal 62 from the sensor 60, and further configured to emit an alarm signal 72.

The alarm signal 72 can be an electronic signal which is used to control a work unit, which is utilised in a cabin linked to the filter unit. The alarm signal can, for example, be used to turn off the work unit. For example, the cabin system can be configured for use in lacquering a surface, where the sensor is a VOC-sensor, and where the system must turn off a spray gun, if the measured VOC-contents in the extracted air exceeds a predetermined threshold.

In fig. 10 the control is illustrated in connection with the filter unit. The control can be implemented in the cabin, the filter unit, or in the system as an independent unit.

The filter unit in fig. 10 is illustrated as comprising a plurality of air inlets, which ena- bles linking a plurality of cabins and/or that a cabin, which can be used for several purposes, can be linked a first air inlet for the first application and a second air inlet with a second application, if the filter unit is divided into different filters designed for specific air inlets and applications. Thus, a scalable cabin system with one or more filter units, and one or more cabins, is achieved.

The filter unit 50 in fig. 11 differs from the one in fig. 10 by comprising filtration wall 58. The filter unit 50 is illustrated with a cover plate assembled over the filters 52. The filtration wall can ensure that the filter unit can be used as a self-contained filter unit, such that a further application of the filter unit, for example for continuous cleansing of the surrounding air in a workspace, is achieved.