Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
APPARATUS FOR DUST COLLECTION
Document Type and Number:
WIPO Patent Application WO/2016/102744
Kind Code:
A1
Abstract:
This invention is related to means used for collecting dust, especially dust collection devices, vacuums and similar used at work sites, which can be moved to a work location. The invention concerns a dust collection apparatus (100) that has a suction chamber (200) that has a filter (212) therein, and which suction chamber (200) has at least one suction inlet (112) for sucking dusty air from outside of the apparatus and which dust collection apparatus (100) has a motor (230) for transferring air from outside of the apparatus through the suction inlet (112) to the suction chamber (200) and further through the filter (212). In this embodiment the dust collection apparatus (100) has at least a first door (120) and a second door (120) which are attached to opposite sides of the suction inlet (112), said doors (120) having an adjustable opening angle, and which doors (120) are turnable against the body of the dust collection apparatus (100).

Inventors:
RUSSI FRANK (FI)
VÄISÄNEN ANTTI (FI)
SILEN PEKKA (FI)
Application Number:
PCT/FI2015/000043
Publication Date:
June 30, 2016
Filing Date:
December 23, 2015
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
CONSAIR OY (FI)
International Classes:
B08B15/02; B01F35/00
Foreign References:
KR20140000432U2014-01-21
US20110312261A12011-12-22
GB2296064A1996-06-19
CN202336468U2012-07-18
Other References:
See also references of EP 3237126A4
Attorney, Agent or Firm:
LEVLIN, Markus (Helsinki, FI)
Download PDF:
Claims:
Claims

1. Dust collection apparatus having a suction chamber that has a filter therein, and which suction chamber has at least one suction inlet for sucking dusty air from outside of the apparatus and which dust collection apparatus has a motor for transferring air from outside of the apparatus through the suction inlet to the suction chamber and further through the filter, characterized in that,

that the dust collection apparatus has at least a first door and a second door which are attached to opposite sides of the suction inlet, said doors having an adjustable opening angle, and which doors are turnable against the body of the dust collection apparatus.

2. Dust collection apparatus according to claim 1 , characterized in that said doors comprise at least one stepless friction hinge.

3. Dust collection apparatus according to claim 1 , characterized in that said doors have been detachably hinged.

4. Dust collection apparatus according to claim 3, characterized in that said doors comprise at least one hinge having a permanent magnet.

5. Dust collection apparatus according to claim 3, characterized in that said doors comprise at least one hinge with a spring fastener. 6. Dust collection apparatus according to claim , characterized in that the dust collection apparatus further comprises a detachable mat manufactured from a flexible material and storage means for storing said mat with the dust collection apparatus. 7. Dust collection apparatus according to claim 1, characterized in that the dust collection apparatus comprises at least one transport handle where at least one wheel is attached.

8. Dust collection apparatus according to claim 1 , characterized in that it comprises a light, which is located above said suction inlet when viewed in the normal operating position of the dust collection apparatus.

Description:
Apparatus for dust collection

The present invention is related to means for collecting dust, especially to movable dust removal apparatuses, vacuums and corresponding devices used at construction sites.

Dust removal is a continuous problem at construction sites. Many different phases of work produce harmful dust, depending on the particular phase of work and material being handled. For example, table saws produce wood dust, and drilling or chiseling produces harmful stone dust. Mixing mortars, concrete, and plaster produces large amounts of harmful fine dust.

Air scrubbers, which suck air out of the working space, are typically used at construction sites. These reduce the amount of dust floating in the air in the working space, and a slight vacuum prevents dust from escaping outside the working space under slight vacuum other than out through the air scrubber.

However, air scrubbers do not remove dust very efficiently from a particular work location.

A solution is known from the patent application US20110312261A1 , in which a strong blower has been connected to a tent-like structure for removal of dust from a work location. This solution has the advantage, that the worker fits in the tent-like structure with his dust producing tool, whereby with sufficient suction this kind of solution is likely to prevent escaping of dust outside the tent-like structure.

However, this kind of structure does not protect the worker himself in any way. Moving of the structure is also rather troublesome, since the structure consists of several separate and large components. Patent application US2009016151A1 describes a solution for removing dust created during mixing of mortar or similar materials, in which dust removal is implemented using a suction ring placed at the top of the mixing container. This kind of solution is apparently rather efficient in removing dust arising from the mixing container. However, this kind of solution does not help at the preceding moment, when mortar powder is poured from the sack of mortar into the mixing container. This is a work phase that produces a lot of dust. When the dust is created above the suction ring in open air space, the effectiveness of dust removal is unavoidably poor. In addition, a suction ring of fixed size does not apply very well to use with containers of different sizes.

An object of the invention is to implement an apparatus for collecting dust, an apparatus that removes dust efficiently from a work location, but does not suffer from problems of prior art. An object of the invention is also to implement a dust collection apparatus, that is easy to transport as well as easy to service and clean.

Different embodiments of the invention are described later in this specification and in the drawings, in which: figure 1 illustrates a dust collection apparatus according to an advantageous embodiment of the invention, viewed from the outside of the apparatus, and figure 2 illustrates schematically the internal structure of a dust collection apparatus according to an advantageous embodiment of the invention.

Same reference numbers refer to same elements in different figures. In the following the structure and use of a dust collection apparatus according to an advantageous embodiment of the invention is described with the help of figure 1. Figure 1 illustrates a dust collection apparatus 100 according to an

advantageous embodiment of the invention. The dust collection apparatus has a suction chamber, inside which there is a filter support and a filter. The suction chamber has a suction inlet 112 for sucking in dusty air from outside of the apparatus.

The dust collection apparatus also has a motor and an impeller, propeller or similar arranged to be rotated by the motor in order to move air from outside of the apparatus through the suction opening to the suction chamber, and onwards through the filter. Figure 1 also shows an air exhaust outlet 4.

The dust collection apparatus has two doors attached to opposite sides of the suction inlet 12. Figure 1 also shows two doors 120. These doors are

advantageously turnable against the body of the dust collection apparatus 100 during transport, and openable to different positions for use. Figure 1 further illustrates means 142 for hindering rotation of a mixing container, which means are described in more detail later in this specification. The dust collection apparatus 100 is suitable for removing of dust during mixing of mortar, concrete, plaster and similar. The mixing container is placed in front of the dust collection apparatus, between doors 120. The operator switches the apparatus on, whereby the motor of the dust collection apparatus starts and starts sucking air through the suction inlet 112. Doors 120 can advantageously be turned to touch the mixing container or near it. While the motor of the apparatus is running, the operator can pour mortar from the mortar bag to the mixing container, whereby the mortar being poured typically strongly forms dust floating in the air. Dust floating in the air is transported along the air flow towards the suction inlet 112. Doors 120 for their part help in directing the air flow towards the suction inlet and reduce the spreading of dust elsewhere. The doors also reduce mixing of inlet and exhaust air to each other, which increases the effectiveness of the operation of the dust collection apparatus.

After pouring the dry mortar mix the operator typically adds water to the mixing container, and mixes the mortar and water to an even mass typically with a powered mixer. During mixing, the part of the mortar that remains dry forms dust floating in the air, until all dry mortar has been moistened. This dust formed during the mixing phase easily floats above the top of the mixing container, whereby it is dragged along with air flow to suction inlet 112.

The mixing phase is associated with another difficulty in addition to dust: splashes. When mixing with a powerful mixer, mortar is easily splashed around in the environment. One purpose of the doors 120 is to protect the environment from these splashes. Protection of the environment requires time and effort especially during renovation of old spaces, where existing wall, floor and ceiling surfaces need to be protected as well as possible. The dust collection apparatus and its doors 120 receive a very large part of splashes created during mixing, whereby the protection of nearby environment does not need as much time and effort.

In an advantageous embodiment of the invention the doors 120 have been attached to the dust collection appartus in such a way, that they can be easily removed and fastened by the operator. This greatly eases the cleaning of the splashes from the doors and keeping the work location clean from splashes, since the cleaning of the doors can be done external to the work location. In an advantageous embodiment of the invention the doors 120 have been equipped with friction hinges, whereby the doors remain due to friction in the position where they have been put, and do not easily change position due to small air flow or a bump. This in part helps in directing suction air flow and splash protection, since the doors stay better in the position where the operator placed the door such as touching the edge of the mixing container, and do not for example open up more due to a small bump, as might happen with hinges functioning easily and with low friction. In an advantageous embodiment of the invention the doors have been equipped with at least one magnetically attachable hinge, whereby removing and attaching the door are particularly easy actions.

Figure 2 illustrates schematically the internal structure of a dust collection apparatus according to an advantageous embodiment of the invention. Figure 2 illustrates a dust collection apparatus 100 having a suction chamber 200. The suction chamber 200 includes a filter support 210 supporting a filter 212. The filter support comprises a vibration motor 214 for vibrating the filter support, and alongide it, the filter, and for dropping dust from the surface of the filter to a collection pan 202 at the bottom of the suction chamber. The dust collection apparatus further comprises a motor 230 and an impeller, propeller or similar 232 for moving air. These move air from outside the dust collection apparatus through suction inlet 112 to suction chamber 200, from where the air moves through filter 212 to the upper part of the apparatus, from where it is exhausted through exhaust outlet 1 4. Doors 120, which are attached to the body of the dust collection apparatus through hinges 121 , help in directing dusty air towards suction inlet 112.

Figure 2 illustrates also control unit 220 and work light 240. Further, figure 2 illustrates a handle 130 for pushing the apparatus. In this embodiment the handle 130 comprises at least one wheel 244 to ease moving of the apparatus in horisontal position, especially when the apparatus is being moved to another level such as the bed of a lorry. The dust collection apparatus can also comprise wheels 140 to aid in transporting. The apparatus may advantageously comprise also rubber stands 244 or other corresponding supports.

In an advantageous embodiment of the invention, the dust collection apparatus comprises for protection of floor surface a mat manufactured from a flexible material such as rubber, which is placed under the mixing container in such a way, that splashes falling near the mixing container fall on the mat. After mixing such a mat can be rolled up and taken for cleaning outside the work location, which is an easy way to handle protection of floor during the mixing and cleaning of mortar splashes. In this kind of embodiment the dust collection apparatus advantageously comprises a holder 242 for such a mat, where the mat can be stored.

The dust collection apparatus can advantageously also comprise a work light placed in the upper part of the apparatus, most advantageously above the suction inlet 1 12, whereby the work light illuminates the mixing container and the space above it. Such a work light eases the use of the apparatus in many ways. The lighting in work sites is typically insufficient, at least uneven, whereby the light of the dust collection apparatus aids in mixing of mortar. The light also helps the operator in seeing the dust better. Better observation of mortar dust directs the operator to do the dust producing work as close to the suction inlet as possible, whereby the least amount of dust possible is spread to the air being breathed.

Further, the dust collection apparatus can also comprise at least one electrical outlet for attaching of external tools. For example, it is very handy for the operator of the apparatus, if the mixing tool can obtain its power from the dust collection apparatus, and one does not need to arrange the mixing tool its own power using power bars and extension cords. The electrical current flowing through this electrical outlet can in different embodiments of the invention be used to control the operation of the dust collection apparatus, for example to control timings of the operation of the dust collection apparatus. For example, in such an embodiment of the invention in which the operation of the dust collection apparatus is controlled by a timer, the use of an external device through the electrical outlet can be used to reset the timer, whereby the dust collection apparatus sucks air for at least a set time after mixing of mortar, removing dust created using the mixing. In an advantageous embodiment of the invention the dust collection apparatus is equipped with handles or pushbar 130. A transversely positioned pushbar allows easy transport of the apparatus by dragging, which makes it easier to transport the apparatus in stairs and uneven surface, such as gravel. The dust collecting apparatus can advantageously be equipped with wheels 140 for ease of moving. In the following, certain elements used in different embodiments of the invention are described in more detail.

The doors can be hinged in many different ways in different embodiments of the invention. For example, the doors can be equipped with barrel hinges, where the body of the apparatus has a pin, to which a hole in the hinge part in the door is directed. Doors equipped with this kind of hinges can be removed by lifting and placed back without tools. Also hinges realized using permanent magnets can be used with the doors. For eaxmple, the door can have a hinge pin of ferromagnetic material, and a part of the hinge attached to the body of the apparatus can have a groove, to which the hinge pin is pressed drawn by a permanent magnet. This kind of hinge works as a quickly attachable hinge, which makes it possible to detach and attach a door very easily and quickly. Because the permanent magnet draws the hinge pin toward the groove in the other half of the hinge, the hinge simultaneously functions as a friction hinge.

Such a hinge realized using permanent magnets can be realized in many different ways. For example, the permanent magnet can be in the hinge pin attached to the door, and the part of the hinge attached to the body of the apparatus can be made of ferromagnetic material, to which the hinge pin is attached by magnetism. On the other hand, the hinge pin can be at the side of the body of the apparatus, and that half of the hinge that has the groove for the hinge pin, can be at the door side.

Further, different combinations of hinge mechanisms can be used in different embodiments of the invention. For example, an advantageous way to provide hinges to a door is to realise one hinge as a conventional pin-and-barrel hinge, and another hinge as a magnetically attaching hinge. Then the door is easy to attach: the operator needs only to position one hinge i.e. the barrel hinge accurately to its correct position, and the other hinge is attached with the magnet merely by placing the halves of the hinge against each other. This is much easier for the operator than attaching a door equipped with two barrel hinges, where both hinges must be positioned accurately to the correct location at the same time.

Previously described hinges using permanent magnets can be used in all hinges of a door, if the weight of the door is not too great or the door is not otherwise subjected to significant forces. The force of a permanent magnet is limited. In heavy doors it is advantageously to use at least one hinge based on mechanical linkage such as a barrel hinge, so that the door would not be detached

accidentally. A hinge using a permanent magnet has the advantage of being easily detached and attached, whereby it is advantageous to use such a hinge in implementations, where ease of detaching of the door is needed.

In an advantageous embodiment of the invention the dust collection apparatus is also equipped with a belt, which can be used to ensure that the doors remain attached to the apparatus during transport. This kind of accessory is especially advantageous in such embodiments of the invention, where the doors have been equipped with quick-release hinges, which might otherwise be detached during transport.

Further, in an advantageous embodiment of the invention at least one hinge of a door is implemented using a spring fastener, i.e. a structure, where one half of the hinge remains attached to the other half of the hinge using a spring. This kind of hinge also allows easy detaching and attaching of the door. A man skilled in the art knows several such hinge structures employing springs, and therefore these are not described here in more detail.

In an advantageous embodiment of the invention the front panel 116 of the dust collection apparatus, in other words the panel having the suction inlet 112, is arranged to be easily detachable for change of filter and collection of dust collected in the apparatus. Advantageously there is also a seal between the front panel and the rest of the body, which seal blocks airflow between the front panel and the rest of the body, whereby the airfow enters the apparatus only through the suction inlet 112.

Advantageously the suction inlet 112 or the suction inlets 112 are formed in such a way that forming of eddies in the airflow that hinder transport of dust to the filter is minimised. In certain further advantageous embodiments of the inventin the replacing of the filter and collection of dust can be effected via another wall part of the body than the front panel 116. A dust collection apparatus should have sufficient suction capacity in order to remove dust created in handling of mortar or similar as efficiently as possible. The inventors have observed, that an airflow of 1200 m3/h in a prototype of the dust collection apparatus was sufficient to maintain an area of roughly one square meter

in front of the dust collection apparatus nearly free from dust. In that prototype, such an airflow was created with a relatively small motor power of 200 W. In different embodiments of the invention airflows with different rates can be used, for example depending on the usage situation. In an advantageous embodiment of the invention the airflow created by the apparatus is at least 1000 m3/h. In another advantageous embodiment of the invention the airflow is at least 500 m3/h.

Further, in different embodiments of the invention the rate of airflow can be arranged to be controllable by the operator. In an advantageous embodiment of the invention the handles or the pushbar 130 of the dust collection apparatus comprise at least one assisting wheel. This kind of assisting wheel (or wheels) help moving the dust collection apparatus for example to the bed of a lorry: the operator can tilt the apparatus so that the handle or pushbar 130 with its assiting wheels is against the surface of the lorry bed, whereafter the operator can lift the apparatus from its lower edge and

simultaneously push the apparatus to the lorry bed aided by the assisting wheels. This kind of assisting wheels allow the dust collection apparatus to be easily handled by just one person. In an advantageous embodiment of the invention the dust collection apparatus comprises rubber feet 244 or other corresponding shock damping elements 244 at the front and bottom edge of the apparatus. These function as front supports during the use of the apparatus, and if these feet extend a bit outside the body, they function as collision protection elements during transporting of the apparatus. In such an advantageous embodiment of the invention, where the doors 120 have a barrel hinge at the lower edge, the attachment screws of these feet can be used as the hinge pins. Further, these rubber feet or similar can be used as handholds or lifting handles, when the apparatus is carried in a horizontal position or when the apparatus is lifted from one level to another.

In an advantageous embodiment of the invention the dust collection apparatus has means 142 for hindering rotation of a mixing container. These means can be for example a rubber friction plate 142, a rubber bar or another element, which by friction hinders rotation of the mixing container during mixing of mortar. The operator can use such an element based on friction simply by pressing with his foot the mixing container against the friction element, whereby the mixing container will not very easily begin to rotate during mixing of the mortar. Such a solution improves the working posture and reduces the need of use of force by the operator, since the operator does not need to press the mixing container between his feet during the mixing work.

In an advantageous embodiment of the invention the means for hindering rotation of a mixing container can be for example a tightenable belt, which can be used to tighten the mixing container against the body of the dust collection apparatus. The means for hindering rotation of a mixing container can also be implemented using various locking mechanisms, that lock the mixing container in one way or another to the dust collection apparatus.

In an advantageous embodiment of the invention the dust collection apparatus comprises a filter 212 that has been attached around a support 210 inside the suction chamber, whereby the motor of the dust collection apparatus and impeller or similar suck air through the filter to outside of the suction chamber. This arrangement allows for the filter to have a large surface area, whereby the airflow speed at the surface of the filter is small, and the dust particles do not get sucked or embed themselves deep in the filter material, but remain loosely stuck on the surface of the filter. Further, in an advantageous embodiment of the invention said filter support is equipped with a vibration mechanism such as a vibration motor 214, which can vibrate the filter with the help of the filter support, whereby dust on the surface of the filter is loosened and falls on the bottom of the suction chamber. There may advantageously be a pan for collecting dust at the bottom of the surface chamber, to which pan the dust fallling from the filter is accumulated, and using which the dust is easy to remove from the apparatus. In an advantageous embodiment of the invention the dust collection apparatus comprises a control unit, which vibrates the filter to loosen the dust at predetermined intervals during the use of the apparatus or at certain phases of use.

For example, the control unit can be configured to vibrate the filter always at the end of use, after the blower motor of the dust collection apparatus has been switched off and the airflow has ceased, so that the dust would get loose from the filter as well as possible. Another example of a suitable phase of vibrating the filter is during startup of the apparatus, before starting of the blower motor. This kind of automatics considerably eases the use of the dust collection apparatus, since the operator does not need to take care of cleaning of the filter. Further, since in this kind of solution the dust is collected in a pan at the bottom of the apparatus for later emptying, there is no need to change the filter often, and the apparatus does not require a replaceable dust bag like conventional vacuums.

In an advantageous embodiment of the invention the filter support has been implemented in such a way, that its natural resonance frequency is close to the frequency of the vibration motor, whereby the movement of the filter caused by the vibration motor is as strong as possible and the cleaning of the filter is as efficient as possible.

In an advantageous embodiment of the invention the top side of the dust collection apparatus has been arranged to be a work surface for the operator. For this, the top side of the dust collection apparatus can comprise a friction mat or a rubber mat, so that objects placed by the operator on top of the apparatus stay in place even during the use of the apparatus. Instead of or in addition to such a friction mat or a rubber mat the top side can have small side walls to further hinder objects placed on top of the apparatus from falling off the top of the apparatus. Such equipping as a work surface eases the work of the operator of the apparatus, as he can place for example a radio, tools, ear muffs, work gloves, or other objects he needs at the work site on top of the apparatus for the duration of mixing of mortar.

In an advantageous embodiment of the invention the dust collection apparatus comprises a control unit for controlling the operation of the apparatus. This kind of control unit can advantageously be an electronic control unit, and it can be realized for example using a microcontroller, whereby the functions of the apparatus can be programmed in the memory of the microcontroller. The control unit advantageously controls the running period of the motor of the dust collection apparatus producing the suction air flow, filter vibration motor and/or the lights of the apparatus. The control unit can advantageously monitor current consumed by a device possibly connected to an electric outlet in the dust collection apparatus, and observe the use of such an external device as one piece of information affecting the control. This kind of a control unit also advantageously receives signals given by the operator through various switches or push buttons. With the help of functions programmed into the control unit different kind of programs can be implemented, for example one program for short periods of mortar mixing, and another program for long periods of general air cleaning in the work site. The control unit can also be programmed to shut down the apparatus after a certain time period after startup of the apparatus or other type of use or after reception of a control signal from the user. In an advantageous embodiment of the invention the control unit has been arranged to indicate the need for replacing the filter. This can be realized in different ways, for example after a certain number of hours of usage has been exceeded. As an another example can be mentioned for example measuring the difference of pressure on each side of the filter, whereby the degree of

cloggedness of the filter can be determined from the difference of pressure.

The invention has several advantages. An apparatus according to the invention is not just one more device in a work site, but a versatile work station. A conventional air scrubber is merely a device that removes dust. An apparatus according to the invention strongly enhances maintaining cleanliness of the work site by

encouraging in many different ways the operators to use the apparatus. In the following, advantages of elements of various embodiments of the invention are described in more detail from this viewpoint. These elements are thus not separate elements independent of each other, but all of them serve to reach the same advantage - as dust-free a work site as possible.

The light in the apparatus functions not only as a work light, but due to its positioning helps the worker to see better the dust created during pouring and mixing of mortar, which naturally encourages the worker to work with less dust. In poor lighting conditions, which is a very typical situation at work sites, the dust is not well visible, whereby it is difficult to avoid creation of it. By encouraging the worker to perform pouring and mixing of mortar as dust free as possible, further decreases the dust load of the work site. In addition to good lighting, use of the apparatus is encouraged by the "container brake", means 142 for hindering rotation of a mixing container, of certain

embodiments of the invention. The existence of these is a factor which

encourages a worker to come to do mixing work at the apparatus and not somewhere else at the work site, since mixing is easier with these means than without this apparatus.

Features encouraging use of the apparatus comprise also the doors positioned on opposite sides of the suction inlet, and the rubber mat functioning as an accessory of the device according to an advantageous embodiment. The doors minimise the splashes to the environment at the moment, when the mixer is lifted out of the mixing container, which is typically a moment when large amounts of splashes are created. The rubber mat, for its part, protects the floor around the mixing container very efficiently. One purpose of the doors as well as the rubber mat is to

encourage the worker to come to do the mixing work at the device, whereby the amount of splashes and the need to clean up the slashes are minimised. This in turn reduces the dust at the work site, since a considerable source of dust is splashes left on floor surfaces. After drying the splashes crumble when they are walked upon, and walking also spreads the created dust in the air.

As is described here, different embodiments of the invention ease the control of dust of a work site in many different ways, and ease maintaining cleanliness at the work site. Advantages brought by different embodiments of the invention help the management of the work site to encourage the workers also to use the device, since in practice mere ordering is not enough, if the workers do not benefit themselves from using the apparatus. This is also one considerable benefit brought by the invention. An apparatus according to the invention also decreases the exposure of a worker to dust especially when compared to solutions known from prior art, where the worker had to go into a tent-like sectioned space with their dust-producing tools, where the worker was also himself in the middle of the dust. The airflow created by an apparatus according to the invention sucks the dust directly into the apparatus, with the dust created in mixing of mortar largely not being able to reach the height of the face of the worker.

In air scrubbers according to prior art, where the filter is at the outer surface of the device, the dust is easily loosened back into air of the room by even a small vibration or touch, whereby handling of the device easily spreads dust back into the room space. Also turbulence existing in the airflow created by such an air scrubber, outside the housing of the air scrubber, can easily spread dust to the environment, whereby the ability to collect dust is not optimal. The structure of an apparatus according to the invention further promotes maintaining of already collected dust within the apparatus without the alredy collected dust being able to accidentally become floating in the air of the work site due to vibration or movement. This is due to the filter of the apparatus being inside the suction chamber of the apparatus, whereby dust possibly falling off the filter while the apparatus is switched off falls to the bottom of the suction chamber. Further, during operation of the apparatus turbulence existing in airflow inside the suction chamber does not spread dust outside the suction chamber.

As described previously, apparatuses according to different embodiments of the invention have several features that aid performing of work and encourage to do mixing at the apparatus. Thus, an apparatus according to the invention is not merely a dust collection device, but is also a mobile work station for mixing mortar, cement and other corresponding materials.

In the following, advantageous embodiments according to an aspect of the invention are described. According to a first embodiment of this aspect the dust collection apparatus has a suction chamber that has a filter therein, and which suction chamber has at least one suction inlet for sucking dusty air from outside of the apparatus and which dust collection apparatus has a motor for transferring air from outside of the apparatus through the suction inlet to the suction chamber and further through the filter. In this embodiment the dust collection apparatus has at least a first door and a second door which are attached to opposite sides of the suction inlet, said doors having an adjustable opening angle, and which doors are turnable against the body of the dust collection apparatus. In an another embodiment according to this aspect said doors comprise at least one stepless friction hinge.

In an another embodiment according to this aspect said doors have been detachably hinged.

In an another embodiment according to this aspect said doors comprise at least one hinge having a permanent magnet.

In an another embodiment according to this aspect said doors comprise at least one hinge with a spring fastener. In an another embodiment according to this aspect the dust collection apparatus further comprises a detachable mat manufactured from a flexible material and storage means for storing said mat with the dust collection apparatus. In an another embodiment according to this aspect the dust collection apparatus comprises at least one transport handle where at least one wheel is attached.

In an another embodiment according to this aspect the dust collection apparatus further comprises a light, which is located above said suction inlet when viewed in the normal operating position of the dust collection apparatus.

Previously, the invention has been described with reference to certain

advantageous embodiments of it, but it is clear for a man skilled in the art, that the invention can be varied in many different ways according to the inventive idea defined by attached claims.