EP2915472A1

EP2915472A1 - Locking means for an industrial vacuum cleaner dust container

Info

Publication number: EP2915472A1
Application number: EP15157411.8A
Authority: EP
Inventors: Björn CAGNER
Original assignee: VACITUP AB
Current assignee: VACITUP AB
Priority date: 2014-03-03
Filing date: 2015-03-03
Publication date: 2015-09-09
Anticipated expiration: 2035-03-03
Also published as: EP2915472B1

Abstract

A locking arrangement and method for a dust container in an industrial vacuum cleaner arrangement wherein said locking arrangement is adapted to lock the dust container into engagement with the industrial vacuum cleaner arrangement. The industrial vacuum cleaner arrangement comprises supporting means to support the locking arrangement and said locking arrangement comprises a lifting cog, a connection axis, and a swivel arm adapted to be moved between a first and second position, wherein said connection axis is adapted to fit in a hole in the supporting means creating a revolving axel engagement, and the lifting cog is a single lifting cog arranged to engage with the supporting means enabling the lifting cog to, through contact engagement, operate the dust container between an upper and lower position when the swivel arm is moved between said first and said second position.

Description

Technical field

The present invention relates generally to a locking mechanism for a dust container in an industrial vacuum cleaner arrangement.

Background art

In prior art it is well known to have industrial vacuum cleaners with dust containers that can be removed or pivoted from its operational position. Such arrangements are beneficial because they make it easier for operators to empty or clean dust containers within industrial vacuum cleaner arrangements. The dust containers are normally substantially formed as a bucket with an open top which is adapted to engage with a main unit, cyclone, or any other suitable part of an industrial vacuum cleaner arrangement. During operation of industrial vacuum cleaners the dust containers typically are arranged in sealed engagement with the main unit or cyclone through engagement between the dust container rim and a corresponding lower part of for example the main unit or cyclone unit. To achieve such sealed engagement different solutions have been purposed, including pressing the dust container upwards into sealed engagement with the rest of the industrial vacuum cleaner arrangement, or alternatively lowering the industrial vacuum cleaner arrangement downwards to achieve the same functionality.
The dust container is normally detachably or pivotally attached to a frame constituting the support structure for the industrial vacuum cleaner arrangement. Such support arrangements provide the operator with the opportunity to detach or pivot the dust container from its original position to a position where it is possible to access the open top of the dust container and thereby enabling emptying or ease the cleaning process of the dust container.
Prior art solutions suffer from problems relating to moving the dust container in to sealed engagement with the corresponding lower part of the industrial vacuum cleaner arrangement. The weight of full dust containers varies between different application areas and it is not unusual that the total weight exceeds 60 kg. This makes it difficult to operate the detachment operation and the person skilled in the art understands that a significant force is exerted on the locking arrangement by the weight of the dust container.
The difficulty involved in the process of lowering and raising the dust container between the locked and unlocked position is thereby dependent on the weight of the dust container. For example, in a situation where the dust container is very heavy the operator might need to apply a significant force in order to perform the process of locking the dust container in to place. There are multiple existing solutions available where toggle fasteners, eccentric locks, or similar solutions are used to fixate the dust container to for example the main unit or cyclone. As understood by the person skilled in the art, those solutions are hard to operate due to the weight that the operator has to handle while fastening or opening those locking devices. Furthermore, in prior art solutions the operator often is required to move a leaver a significant distance in order to lock or unlock the dust container.
In prior art there are solutions addressing the issue of handling the weight including usage of leavers that are moved in a vertical manner. Those leavers could for example be attached to wheels mounted on a pivoting axis that are used to raise the dust container in to position. Such solutions overcome some of the problems that are associated with the use of for example eccentric locks but present new issues for the operator. Operators that operate such leaver arrangements still have to compensate for the high weight of the dust container while raising or lowering the dust container. This presents a risk that the operator might get one's finger caught or hand jammed between the leaver and the frame of the industrial vacuum cleaner.
Another problem associated with the dust container in prior art is that there are different ways to empty dust containers due to different methods of collecting the dust. It is common to use for example a plastic bag or any other form of collector that can gather dust without allowing the dust to come into direct contact with the dust container. Usage of soft collectors, such as plastic bags, is problematic in vacuum cleaners where different pressures constantly apply in different parts of the vacuum cleaner arrangement. This is illustrated for example in the common situation wherein the dust container is arranged directly under the cyclone. Industrial vacuum cleaner arrangement commonly comprises an electric motor that through the cyclone applies a negative pressure that thereby normally during operation is present between the cyclone and the dust container. The negative pressure forces the soft collector upwards into the cyclone causing the dust collection to cease, or in worst case, causing damage to the industrial vacuum cleaner.
The issue of negative pressure between the cyclone unit and the dust container has been addressed with different solutions in prior art including usage of collectors with built in structural integrity. Such structures can for example be wire frames inserted in to the dust container as a complement to the soft collector. By introducing a wire frame the soft collector receives a structural integrity counteracting the negative pressure. The addition of a wire frame creates a solution wherein the wire frame either needs to be disposable or it needs to be designed in a way that it can be removed from the soft collector when an operator empties the dust container.
Another solution that previously has been presented is to change the vacuum ratio between the cyclone and the space beneath the soft collector within the dust container. This can for example be achieved by adding a vacuum hose to the lower section of the dust container which applies a slightly stronger negative pressure below the soft collector than the negative pressure above the soft collector exerting a force that keeps it in place during operation.
Although the solution with a vacuum hose attached to the lower section of the dust container is functional it provides additional maintenance cost to the industrial vacuum arrangement and limits the movement of the dust container. Connecting a vacuum hose to a removable or pivoted dust container has traditionally been conducted through an aperture and a hose clamp. This solution works in terms of achieving a negative pressure below the soft collector but in situations where the operator removes the dust container or pivots it from its original position the hose is subjected to additional wear and tear. During the lifetime of an industrial vacuum cleaner while the dust container is pivoted back and forth with the vacuum hose connected the connection and hose constantly need to be checked for deficiencies.

Summary of invention

With the aforementioned problems and prior solutions in mind it would be advantageous to provide a locking arrangement for an industrial vacuum cleaner that is easy to operate and handles the weight of a heavy dust container without jeopardizing the safety of the operator. It would further be advantageous to include the connection of a vacuum hose between the vacuum source and the dust container in a new and innovative way resolving the aforementioned problems.
It is an object of the present invention to obviate at least some of the disadvantages in the prior art and to provide an improved locking arrangement
This is achieved by a locking arrangement wherein the actuating leaver is a swivel arm actuated horizontally in accordance with the appended claim set.
Thereby, the object is achieved by a locking arrangement for a dust container in an industrial vacuum cleaner arrangement wherein said locking arrangement is adapted to lock the dust container into engagement with the industrial vacuum cleaner arrangement. The industrial vacuum cleaner arrangement comprises supporting means to support the locking arrangement and said locking arrangement comprises a lifting cog, a connection axis, and a swivel arm adapted to be moved between a first and second horizontal position, wherein said connection axis is adapted to fit in a hole in the supporting means creating a revolving axel engagement. The lifting cog is a single lifting cog arranged to engage with the supporting means enabling the lifting cog to, through contact engagement, operate the dust container between an upper and lower position when the swivel arm is moved between said first and said second position.
Industrial vacuum cleaner arrangements, such as industrial or central vacuum cleaning systems with a centralized vacuum and dust collection unit, are vacuum cleaners adapted for commercial usage or other usage where industrial grade vacuum cleaning systems are required. Such vacuum cleaning arrangements can in one embodiment comprise a vacuum motor, cyclone unit, filter unit, and dust container. The dust container is adapted to collect the dust gathered by the industrial vacuum cleaning arrangement.
In general terms, the locking arrangement provides a solution wherein the operator actuates a swivel arm in a horizontal manner instead of a vertical reducing the risk for injuries. By providing a solution comprising a swivel arm operated between a first and second horizontal position the weight exerted downwards that the operator has to counteract is eliminated. The risk of injury is significantly reduced by eliminating the risk of the operator's fingers getting caught between the leaver and the construction by the exerted force the dust container weight applies on the leaver. The horizontal movement of the swivel arm helps distribute the load of the dust container in a way that the operator needs to counteract less weight than in a construction where a vertical leaver is used.
The use of a single lifting cog instead of multiple lifting cogs provides a rigid construction with a low production cost.
In one embodiment of the locking arrangement the lifting cog has two ridges adapted to position the locking arrangement in at least one of the first and second positions.
The ridges can for example be substantially flat or horizontal edges, surfaces, or sections of the lifting cog that allows for the dust container to rest in any of the first or second positions. This provides the benefit that the operator can leave the swivel arm in one of the first or second positions at a time.
In one embodiment of the locking arrangement the lifting cog has at least one locking ridge adapted to lock the locking arrangement in at least one of the first and second positions.
The locking ridges are an alternative, or complementary, solution to the previously described ridges. The locking ridges, in comparison to the aforementioned ridges, comprise an additional recess wherein the supporting means is locked in at least one of the first or second positions. This means that when the dust container is at rest in one of the first or second positions, the position of the lifting cog is locked in position in relation to the supporting means by for example a notch at the edge of the recess. Such notch would require that the operator use additional force in order to move the lifting cog from the locked position.
It is beneficial for the usage of the locking arrangement if the dust container can be locked into position when the operator has moved the swivel arm to one of the first or second positions. This is done by the ridges adapted to position the locking arrangement in at least one of the first and second positions.
In one embodiment of the locking arrangement the connection axis is a hollow axis and said dust container, in its lower section, comprises an aperture that at alignment with the locking arrangement is adapted to correspond with the top end of the hollow axis creating a fluid connection between the hollow axis and the lower section of the dust container.
In a one embodiment of the present invention the dust container contains a removable dust collector. In one embodiment the dust collector is a soft dust collector such as a plastic bag, adapted to collect the dust gather by the industrial vacuum cleaner. In order to prevent the soft collector from being forced upwards from the dust container and in to the cyclone unit it is beneficial to provide a vacuum beneath said plastic bag. This is in the present invention achieved through establishment of a fluid connection between the lower section of the dust container and the main vacuum unit of the vacuum cleaner arrangement in order to provide a vacuum to the lower section of the dust container. The vacuum beneath the soft collector is adapted to compensate for the negative pressure above the soft collector keeping it in place. By providing a solution wherein such fluid connection is achieved through engagement between the locking arrangement the movement of the vacuum hose is reduced decreasing the wear and tear of such construction while providing a dust container free from hose connections or any other form of additional features limiting its movement.
In another embodiment of the locking arrangement the industrial vacuum cleaner arrangement further comprises a vacuum source and a vacuum hose. The vacuum hose is connected to the vacuum source and the hollow axis creating a fluid connection between the lower section of the dirt container and the vacuum unit.
In yet another embodiment of the locking arrangement the industrial vacuum cleaner arrangement further comprises a filter arranged adjacent to the vacuum source in the industrial vacuum cleaner arrangement. The vacuum hose is in direct fluid connection with said vacuum source and the lower section of the dirt container and the upper section of the dirt container is in fluid connection with the vacuum source by passing through the filter.
It is beneficial to only have one vacuum source although different vacuum pressure is required at different places within the industrial vacuum cleaner arrangement. By utilizing the vacuum loss created by the filter different vacuums can be achieved above and below the soft collector in the dust container.
In one embodiment of the locking arrangement, the dust container further comprises an air permeating cover arranged to cover the aperture in the lower section of said dirt container.
The vacuum hose is connected to the lower part of the dust container and there is a risk that the soft collector, such as a plastic bag, might be dragged down into the aperture creating the fluid vacuum connection for the lower part of the dust container. It is beneficial to distribute said soft collector over the vacuum aperture which for example can be done through arranging an air permeating cover such as a cover net.
In one embodiment of the locking arrangement, instructions, such as a decal, sticker, or label, is attached to the dust container indicating the first and second positions.
It is an advantage with the present invention that the swivel arm is moved horizontally. This further has the effect that a decal, sticker, or label can be attached to the side of the dust container indicating the locked and unlocked positions.
In one embodiment of the locking arrangement, the locking arrangement comprises a top surface that has substantially the same surface size as the bottom surface of said dust container.
The dust container is adapted to rest on the top surface of the locking arrangement. It is therefore beneficial in some application areas to have a top surface which is of substantially the same surface size as the bottom surface of the dust container.
An aspect of the invention is to lock a dust container into engagement with an industrial vacuum cleaner arrangement by a locking arrangement. The industrial vacuum cleaner arrangement comprises means to support the locking arrangement, and the locking arrangement comprises a lifting cog, a connection axis, and a swivel arm adapted to be moved between a first and second position, the aspect comprises the steps:

arranging said connection axis through a hole in the supporting means creating a revolving axel engagement,
arranging the lifting cog as a single lifting cog to engage with the supporting means, and
actuate the swivel arm between said first and second position to operate the dust container between an upper and lower position by means of contact between said single lifting cog and said supporting means.

According to one aspect the connection axis is a hollow axis and said dust container further comprises an aperture in its lower section, wherein the aspect further comprises the steps of:

aligning the aperture of the dust container with the top end of the hollow axis prior of actuating the swivel arm,
connecting a vacuum hose between a vacuum source and the hollow axis,
actuating the swivel arm creating a fluid connection between the hollow axis and the lower section of the dust container.

Brief description of drawings

The invention is now described, by way of example, with reference to the accompanying drawings, in which:

Fig. 1 illustrates a side view of a first embodiment of the swivel arm, the connection axis, and the lifting cog.
Fig. 2 illustrates a side view of a second embodiment of the swivel arm, the connection axis, and the lifting cog.
Fig. 3 illustrates the swivel arm in a first position connected to the support frame of the industrial vacuum cleaner arrangement through means of the connection axel.
Fig. 4 illustrates the swivel arm in a second position connected to the support frame of the industrial vacuum cleaner arrangement through means of the connection axel.
Fig. 5 illustrates an alternative embodiment of the swivel arm in a second position with a vacuum hose connected to the hollow connection axis.
Fig. 6 illustrates a front view of the industrial vacuum cleaner arrangement with the dust container in a locked and operational state.
Fig. 7 illustrates a front view of the industrial vacuum cleaner arrangement with the dust container in a released state.
Fig. 8 illustrates an embodiment of the dust container comprising an aperture in the lower section for connection of a vacuum hose and a distribution net covering the aperture.
Fig. 9 illustrates the air permeating cover adapted to cover the aperture in the dirt container and distribute the soft collector above the aperture.

Description of embodiments

In the following, a detailed description of the different embodiments of the locking means for an industrial vacuum cleaner is disclosed under reference to the accompanying drawings. All examples herein should be seen as part of the general description and are therefore possible to combine in any way of general terms. Individual features of the various embodiments and methods may be combined or exchanged unless such combination or exchange is clearly contradictory to the overall function.
Figure 1 illustrates a first embodiment of the swivel arm 1 comprising a handle portion 2, an arm 3, a lifting cog 4, and a connection axis 5. The length of the arm 3 can in one embodiment substantially correspond to either the radius or half the width of the dust container 61 placing the handle portion 2 outside of the outer perimeter of a dust container 61 at easy access for an operator.
The lifting cog 4 has two different levels 4a, 4b and a sloping middle section connecting the two different levels 4a, 4b. The two different levels 4a, 4b enables the first and second position of the swivel arm 1 corresponding to a locked position and an unlocked position for the dust container 61. The lifting cog 4 can be any form of cog 4 adapted to engage with supporting means 31 that comprises an angel or radius allowing for the lifting cog to increase or decrease the height of the locking arrangement 32 if rotated in relation to the supporting means 31. The supporting means 31 can in one embodiment be a square or rectangular solid or hollow metal profile.
The handle portion 2 of the swivel arm 1 may have different designs in different embodiments of the invention, for example, in one embodiment the handle portion 2 could be covered in a soft material such as rubber or fabric. The angle of the lifting middle section of the cog 4 might vary depending on the weight of the dust container 61 and/or the design of the swivel arm 1.
Figure 2 illustrates a second embodiment of the swivel arm 1 comprising a handle portion 2, an arm 3, a lifting cog 4, and a connection axis 5. The swivel arm 1 further comprises one or more ridges 21 a, 21 b to help support and lock the swivel arm 1 in the first and second positions corresponding to the two levels 4a, 4b.
By utilizing the ridges 21 a, 21 b, the swivel arm 1 may be locked in to at least one of the locked or unlocked positions, in one embodiment both. The person skilled in the art understands that the swivel arm 1 only can be locked to one position at a time and an operation of the swivel arm 1 is required to change position.
The ridges 21 a, 21 b can in different embodiments have different designs, for example in one embodiment the edges of the ridges 21 a, 21 b are curved in order to ease the transaction between a locked position and movement of the dust container.
Figure 3 illustrates the swivel arm 1 arranged in the locking arrangement 32. The connection axis 5 is adapted to fit in a hole in the supporting means 31 for the locking arrangement creating a revolving axel engagement between the swivel arm 1 and the supporting means 31. The swivel arm 1 is in Figure 3 placed to the lower position of the first and second position which is the position corresponding to the lower level 4a meaning that the lower level 4a is in contact engagement with the supporting means 31 for the locking arrangement.
In one embodiment of the present invention the weight of the dust container 61 pressing downwards on the swivel arm 1, through the engaged level 4, and finally the supporting means 31 supports the swivel arm 1 in the selected position by the pure pressure and friction between the surface of the lifting cog 4 level and the supporting means 31. However, it is beneficial to in accordance with the aforementioned embodiment of Figure 2 to lock the swivel arm 1 in one of the first and second positions.
Figure 3 further illustrate parts of the frame 34 that supports the support means 31 and constitutes the frame supporting the entire industrial vacuum cleaner arrangement.
Figure 4 illustrates the swivel arm 1 and how the connection axis 5 is adapted to fit in a hole in the supporting means 31 for the locking arrangement creating a revolving axel engagement between the swivel arm 1 and the supporting means 31. The connection and arrangement is in Figure 4 shown with the swivel arm 1 in the opposite position than in Figure 3, i.e. placed in the higher position. This position illustrated in figure 4 is the position corresponding to the higher level 4b meaning that the higher level 4b is in contact engagement with the supporting means 31 of the locking arrangement. In one embodiment of the invention would the dust container in this position be locked into the industrial vacuum cleaner arrangement.
The locking arrangement is in one embodiment made out of metal and welded together, or attached in any other suitable way.
Figure 5 illustrates another embodiment wherein the connection axis 5 is a hollow connection axis 5 which passes through the swivel arm 1 and ends in an aperture 51. In one embodiment a hose 52 is connected to the lower end of the hollow connection axis 5. The hose 52 through the fluid connection is adapted to arrange a vacuum to the lower part of the dirt container 61. The hose 52 could in one embodiment thereby be a vacuum hose 52 that is connected to the main vacuum source of the industrial vacuum cleaner arrangement.
The dust container 61 is adapted to be arranged in contact engagement with the top surface 33 of the swivel arm 1. The dust container 61 may in one embodiment have an aperture in the bottom that is adapted to align with the aperture 51 in the top of the swivel arm 1, i.e. the top end of the hollow connection axis 5.
In one embodiment the vacuum hose 52 is in fluid connection to the dust container 61 through the aperture 51. It is beneficial to arrange a seal around either the aperture 51, the corresponding aperture in the dust container 61, or both.
The vacuum source connected to the vacuum hose 52 arranged to keep the plastic bag down is in one embodiment the same as the main vacuum source for the central vacuum cleaner. The vacuum cleaner arrangement 61 further comprises a filter that is adapted to filter air as part of the functionality of the industrial vacuum cleaner. The filter contains a vacuum loss which means that the vacuum pressure below the plastic bag is always higher than the vacuum pressure above the plastic bag. This is due to the fact that the vacuum hose 52 is attached between the vacuum source and the filter.
Figure 6 illustrates the lower parts of the industrial vacuum cleaner arrangement 62 comprising the dust container 61. The dust container 61 is in figure 6 illustrated in its locked position and the swivel arm 1 is thereby stationary in the locked position. In one embodiment of the invention the swivel arm 1 is rotated substantially around a bucket formed dust container 61 in order to raise or lower said dust container 61. Such movement locks and releases the dust container 61.
In figure 6 it is further illustrated how the vacuum hose 52 is in fluid connection with the dust container 61 through the connection axis 5 and the aperture 51.
Figure 7 illustrates another embodiment of the invention wherein the dust container 61 is in a pivoted position and the swivel arm 1 is in the lower, released, position. In one embodiment of the invention a sticker, label, or instruction decal is attached to the dust bin in order to describe the direction of the locked and unlocked position of the swivel arm 1.
Figure 8 illustrates the dust container 61 and the arrangement of parts within it. The dust container 61 may in one embodiment comprise a soft collector 81, such as a plastic bag, arranged substantially on the inside of the dust container 61. As previously described the soft collector 81 is at risk to be dragged out of the dust container 61 by the negative pressure created for example in the cyclone located above the dust container 61 during operation. In order to prevent such movement of the soft collector 81 a negative pressure is applied below the soft collector 81 within the dust container 61. The negative pressure is in an embodiment applied through a vacuum hose 52 connected through the swivel arm 1 and in fluid connection with the lower part of the dust container 61 through an aperture located for example in the bottom of the dust container 61. In order to prevent the soft collector 81 from entering the aperture in the bottom of the dust container 61 an air permeating cover 62 is arranged over the aperture in an embodiment of the invention. The air permeating cover can be any form of net or cover that prevents the soft collector 81 from entering into the aperture.
Figure 9 illustrates an example embodiment of the air permeating cover 62 adapted to be arranged in the dust container 61.
It should be noted that in the detailed description above any embodiment or feature of an embodiment are only examples and could be combined in any way if such combination is not clearly contradictory.

Claims

A locking arrangement (32) for a dust container (61) in an industrial vacuum cleaner arrangement (62) wherein said locking arrangement (32) is adapted to lock the dust container (61) into engagement with the industrial vacuum cleaner arrangement (62), the industrial vacuum cleaner arrangement (62) comprises supporting means (31) to support the locking arrangement (32) and said locking arrangement (32) comprises a lifting cog (4), a connection axis (5), and a swivel arm (1) adapted to be moved between a first and second horizontal position, characterized in that said connection axis (5) is adapted to fit in a hole in the supporting means (31) creating a revolving axel engagement, and
the lifting cog (4) is a single lifting cog (4) arranged to engage with the supporting means (31) enabling the lifting cog (4) to, through contact engagement, operate the dust container (61) between an upper and lower position when the swivel arm (1) is moved between said first and said second position.
The locking arrangement (32) according to claim 1, wherein said lifting cog (4) has two ridges (4a, 4b) adapted to position the locking arrangement (32) in at least one of the first and second positions.
The locking arrangement (32) according to claim 1 or 2, wherein said lifting cog (4) has at least one locking ridge (21 a, 21 b) adapted to lock the locking arrangement (32) in at least one of the first and second positions.
The locking arrangement (32) according to claim 1-3, wherein said connection axis (5) is a hollow axis (5) and said dust container (61) in its lower section comprises an aperture that at alignment with the locking arrangement (32) is adapted to correspond with the top end of the hollow axis (5) creating a fluid connection between the hollow axis (5) and the lower section of the dust container (61).
The locking arrangement (32) according to claim 4, wherein the industrial vacuum cleaner arrangement (62) further comprises a vacuum source and a vacuum hose (52), wherein said vacuum hose (52) is connected to the vacuum source and the hollow axis (5) creating a fluid connection between the lower section of the dirt container (61) and the vacuum unit.
The locking arrangement (32) according to claim 5, wherein the industrial vacuum cleaner arrangement (62) further comprises a filter arranged adjacent to the vacuum source in the industrial vacuum cleaner arrangement (62), wherein the vacuum hose is in direct fluid connection with said vacuum source and the lower section of the dirt container, and
wherein the upper section of the dirt container (61) is in fluid connection with the vacuum source by passing through the filter.
The locking arrangement (32) according to any one of the preceding claims 4-6, wherein the dust container (61) further comprises an air permeating cover (81) arranged to cover the aperture in the lower section of said dirt container (61).
The locking arrangement (32) according to any one of the preceding claims, wherein instructions, such as a decal, sticker or label, is attached to the dust container (61) indicating the first and second positions.
The locking arrangement (32) according to any one of the preceding claims, wherein said locking arrangement (32) comprises a top surface (33) that has substantially the same surface size as the bottom surface of said dust container (61).
A method to lock a dust container (61) into engagement with an industrial vacuum cleaner arrangement (62) by a locking arrangement (32), wherein said industrial vacuum cleaner arrangement (62) comprises means (31) to support the locking arrangement (32), and
said locking arrangement (32) comprises a lifting cog (4), a connection axis (5), and a swivel arm (1) adapted to be moved between a first and second position, characterized in that the method comprises the steps:
arranging said connection axis (5) through a hole in the supporting means (31) creating a revolving axel engagement,

arranging the lifting cog (4) as a single lifting cog (4) to engage with the supporting means (31), and

actuate the swivel arm (1) between said first and second position to operate the dust container (61) between an upper and lower position by means of contact between said single lifting cog (4) and said supporting means (31).
The method to lock a dust container (61) according to claim 10, wherein said connection axis (5) is a hollow axis (5) and said dust container (61) further comprises an aperture in its lower section, wherein the method further comprises the steps of:
aligning the aperture of the dust container (61) with the top end of the hollow axis prior of actuating the swivel arm (1),

connecting a vacuum hose between a vacuum source and the hollow axis,

actuating the swivel arm (1) creating a fluid connection between the hollow axis and the lower section of the dust container (61).