DE102017114897B4 - Fine vacuum cleaner, use of the same and suction pipe - Google Patents

Abstract

A hand-held vacuum cleaner (10) for cleaning surfaces, comprising:- a suction tube (11) with a handle (12) extending along a longitudinal axis and having a surface (27) for sucking in air and dust particles;- a separation system (14) for separating the dust particles;- a hose (13) for connecting the separating system (14) to the suction pipe (11);- a motor (15) for generating a negative pressure such that the air and dust particles from the suction pipe (11) the separating system (14)- a battery (22) for supplying the motor (15) with electricity; characterized in that the suction pipe (11) has on the surface (27) several openings (16) for suction of air and dust particles, the suction pipe (11) has a length of 20 to 100 cm and an inner diameter of less than 2 cm, the ratio of the inner diameter (25) of the suction pipe (11) to the length (24) of the suction pipe (11) being less than 1/30 , and the handle (12) protrudes approximately perpendicularly to the longitudinal axis of the suction pipe (11) from the suction pipe (11).

Description

• - ein Saugrohr mit Griff, das sich, entlang einer Längsachse erstreckt und eine Oberfläche hat, zum Ansaugen von Luft und Staubpartikeln;
• - ein Trennsystem zur Abscheidung der Staubpartikel;
• - einen Schlauch zur Verbindung des Trennsystems mit dem Saugrohr;
• - einen Motor zur Erzeugung eines Unterdrucks derart, dass die Luft und Staubpartikel aus dem Saugrohr dem Trennsystem zugeführt werden
• - eine Batterie zur Versorgung des Motors mit Strom.

The invention relates to a hand-held vacuum cleaner for cleaning surfaces, comprising:

• - a suction tube with a handle, which extends along a longitudinal axis and has a surface for sucking air and dust particles;
• - a separation system to separate the dust particles;
• - a hose for connecting the separation system to the suction pipe;
• - A motor for generating a negative pressure such that the air and dust particles are fed from the suction pipe to the separation system
• - a battery to power the motor.

The invention also relates to the use of the hand-held vacuum cleaner and a suction tube.

The US 986 245 A from 1911 relates to a suction tube for a vacuum cleaner.

A hand vacuum cleaner is, for example, from the U.S. 2012/0 079 671 A1 known. With that hand-held vacuum cleaner, the operator holds a suction pipe, a motor, a separation system for separating the dust particles, a battery, a floor nozzle with its joint and possibly brushes via a handle. Above all, the floor nozzle with its joint, the battery, the separation system and the motor have a certain weight. Together, these functional units form a hand-held vacuum cleaner, the weight of which can cause problems for the user. During longer cleaning processes and especially when cleaning surfaces where the handheld vacuum cleaner or the floor nozzle cannot be supported on the floor, i.e. the handheld vacuum cleaner with its nozzle has to be lifted, the user can tire quickly or the nozzle of the handheld vacuum cleaner may not work at all to the desired places. Vertical or sloping surfaces that are not at floor level are particularly problematic here, for example the surfaces of screens, glass surfaces, windows, walls, plants and furniture.

A handheld vacuum cleaner is not just because of its weight U.S. 2012/0 079 671 A1 poorly suited for these surfaces, the cleaning process is also inefficient because the floor nozzle has to be guided exactly to the area to be cleaned, which can be difficult, especially on vertical surfaces such as screens, glass surfaces, windows, walls, plants and furniture.

The invention is therefore based on the object of improving a hand-held vacuum cleaner of the type mentioned at the outset in such a way that surfaces can be cleaned quickly and efficiently. In addition, by reducing the weight to be held, it should be possible for less strong or older people to use a hand-held vacuum cleaner.

The invention is also based on the object of specifying the use of a hand-held vacuum cleaner and a suction tube.

According to the invention, this object is achieved by a hand-held vacuum cleaner according to claim 1. With regard to the use of a hand-held vacuum cleaner, this object is achieved by the subject matter of claim 11. With regard to the intake manifold, this object is achieved by the subject matter of claim 12.

In particular, the object is achieved according to the invention by a hand-held vacuum cleaner of the type mentioned in that the suction pipe has a number of openings on the surface for sucking in the air and dust particles, the suction pipe has a length of 20 to 100 cm and an inner diameter of less than 2 cm, wherein the ratio of the inside diameter of the suction tube to the length of the suction tube is less than 1/30, and the handle protrudes from the suction tube approximately perpendicularly to the longitudinal axis of the suction tube.

A hand-held vacuum cleaner designed according to the invention also has the advantage that the suction tube with a plurality of openings on the surface can be guided over the surface to be cleaned without effort. The suction tube is preferably moved parallel to the surface. The multiple openings cover a large area. This means that a large area can be cleaned with a single movement. Furthermore, it is not necessary to guide a single opening exactly to the surface to be cleaned.

In addition, the weight of a floor nozzle or a nozzle head and the usually heavy joint are eliminated. Apart from the weight load from the floor nozzle or the nozzle head and the joint, these components shift the center of gravity of the suction tube away from the handle, which makes operation more difficult and also more strenuous.

Especially with sensitive surfaces such as screens, glass surfaces, windows, walls, plants and furniture, it is important to guide the hand vacuum cleaner in a controlled, gentle and even manner over the surfaces, which is possible with a hand vacuum cleaner according to the invention because of the multiple openings, because of the reduced weight and because of the advantageous focus is possible.

In a preferred embodiment, the hand-held vacuum cleaner includes a housing with an attachment system for attaching the housing to a belt or harness system, the housing containing the disconnection system, the battery and/or the motor. The housing can be fastened to a belt or a belt system via the fastening system and fastened, for example, to the hips or the upper body of the user, so that the disconnection system, the battery and/or the motor can also be carried comfortably on the hips or the back. Thus, the weight that has to be held in the user's hand can again be significantly reduced, making the advantages listed above even more pronounced.
The battery can be easily removed from the case for replacement or recharging. In other embodiments, however, the battery can also be charged in the housing. Carrying the battery in the housing on a belt or belt system is particularly advantageous, since batteries are particularly heavy.
The housing can include a switch for switching the handheld vacuum cleaner on and off or operating it. Pressing here means using the suction function.
In other embodiments, the suction tube and/or the handle contains the motor.

In a preferred embodiment, the suction pipe contains plastic. In a further preferred embodiment, the suction tube is made of plastic. The intake manifold is preferably in one piece. One-piece means that the intake manifold is (like) made of one piece. Furthermore, the intake manifold is preferably rigid. A suction tube that contains plastic and is in one piece is particularly preferred. In further embodiments, the intake manifold contains one or more metals. In further embodiments, the intake manifold consists of one or more metals. Light metals, for example aluminum, are preferred. The intake manifold can therefore be a thin-walled aluminum tube.

The suction tube has a length of 20 to 100 cm. Length means the maximum extent along the longitudinal axis of the intake manifold. The length is limited on the one hand by the transition of the suction tube into the hose and on the other hand by the end facing away from the hose. A shorter suction tube is lighter, has high suction power and is easier to handle, while a longer suction tube can clean a larger area with one movement.

In a preferred embodiment, the suction pipe is closed on the end facing away from the hose. For cleaning, the longitudinal side of the suction pipe is preferably moved over the surface to be cleaned, so that an opening at the end facing away from the hose unnecessarily costs suction power.

The suction tube has an inner diameter of less than 2 cm, preferably in particular less than 1.5 cm. An inner diameter of between 0.5 and 1.5 cm is particularly preferred. The inner diameter is preferably filled with air. The small diameter of the suction tube does not impair its function, but saves material and weight compared to conventional vacuum cleaners.

The suction tube preferably has an outside diameter of less than 3 cm, in particular less than 2 cm. An outer diameter of between 1 and 2 cm is particularly preferred. The outside diameter results from the sum of the thickness of the material of the intake manifold, preferably the plastic, and the air-filled inside diameter. The small diameter of the suction tube does not impair its function, but saves material and weight compared to conventional vacuum cleaners.

The ratio of the inner diameter of the suction tube to the length of the suction tube is less than 1/30, preferably less than 1/45. In other words, the intake manifold is disproportionately long in terms of its inside diameter.

In a preferred embodiment, the separation system comprises a filter system, preferably a bag filter system. The advantage of the bag filter system is that it does not require regular emptying, so it is user-friendly.

The hand-held vacuum cleaner preferably comprises at least one fabric, preferably a cloth, and/or at least one brush, which is arranged on the outside of the suction pipe, preferably in the area of the openings, the fabric preferably comprising electrostatic material and/or microfibers.

A fabric with electrostatic material is charged by friction, for example when it is passed over a surface, and attracts dust particles. A fabric with microfibers has a very large area and can absorb a large amount of dust. What is advantageous about the at least one fabric, containing electrostatic material and/or microfibers, and/or the at least one brush is that dust particles are conveyed in the vicinity of the openings and are sucked up more easily. The at least one fabric and/or the at least one brush are also advantageous when, for some reason, the suction power of the vacuum cleaner is not sufficient to suck up all dust particles. In this case, the vacuum cleaner is through supporting the at least one fabric and/or the at least one brush. If, for example, the battery is empty, a surface that has not yet been cleaned can be cleaned simply by wiping with the suction tube. The at least one web, preferably a cloth, containing electrostatic material and microfibers can take on various shapes and thicknesses. The shape of the fabric is adapted to the openings. Multiple fabrics with electrostatic material and microfibers can also be used. A further advantage of the at least one fabric is that sensitive surfaces, for example those of screens, glass surfaces, windows, plants and furniture, are protected.

The invention is also based on the idea of specifying the use of a hand-held vacuum cleaner according to the invention for removing dust particles from surfaces, in particular from screens, glass surfaces, windows, walls, plants and/or furniture. The use of a hand-held vacuum cleaner designed according to the invention has the advantage that the suction tube with a plurality of openings on the surface can be guided over the surface to be cleaned without effort and in parallel. The multiple openings cover a large area. Above all, it is not necessary to guide a single opening exactly to the point to be cleaned.

In addition, the weight of a floor nozzle or a nozzle head and the usually heavy joint are eliminated. Apart from the weight load from the floor nozzle or the nozzle head and the joint, these components shift the center of gravity of the suction tube away from the handle, which makes operation more difficult and also more strenuous. Especially with sensitive surfaces such as screens, glass surfaces, windows, walls, plants and furniture, it is important to guide the hand vacuum cleaner in a controlled, gentle and even manner over the surfaces, which is important when using a hand vacuum cleaner according to the invention because of the multiple openings, the reduced weight and the advantageous focus is possible.

In addition, the invention is based on the idea of providing a suction tube with a handle for a vacuum cleaner, which extends along a longitudinal axis and has a surface for sucking in air and dust particles, the suction tube having a plurality of openings on the surface for sucking in air and dust particles has and is closed on the end remote from the hose. This means that a large area can be cleaned with one movement. The suction tube has a length of 20 to 100 cm and an inner diameter of less than 2 cm, the ratio of the inner diameter of the suction tube to the length of the suction tube being less than 1/30, and the handle extends approximately perpendicularly to the longitudinal axis of the suction tube protrudes from the intake manifold. For further advantages and preferred embodiments of the suction tube according to the invention, reference is made to the above statements.

• 1 einen erfindungsgemäß ausgebildeten Handstaubsauger;
• 2 einen Querschnitt durch die Längsachse des Saugrohres.

The invention is explained in more detail below using an exemplary embodiment with reference to the accompanying drawings. The drawings are schematic and do not necessarily reflect proportions correctly. In these show:

• 1 a hand-held vacuum cleaner designed according to the invention;
• 2 a cross section through the longitudinal axis of the intake manifold.

1 shows the hand-held vacuum cleaner 10 for cleaning surfaces, comprising a suction tube 11 which has a handle 12 for one or two hands of a user. The intake manifold 11 is rigid and in one piece, ie (like) from one piece. It preferably contains plastic and is lightweight. The suction pipe 11 extends along a longitudinal axis over a length 24 and forms the surface 27 around the longitudinal axis. The handle 12 is located on the side of the suction pipe 11 opposite nine openings 16. The suction pipe 11 is at the end facing away from the hose 13 23 closed and has on its surface 27, along its longitudinal axis, nine rectangular openings 16 for sucking in air and dust particles. Air and dust particles are conveyed by a negative pressure via a hose 13 into a separation system for separating the dust particles 14, the negative pressure being generated by a motor 15 which is supplied with electricity by a battery 22.

In this embodiment, the plurality of openings 16, the suction tube 11, the hose 13, the separation system 14, the motor 15 and the battery 22 are arranged so that the sucked air flows through the handheld vacuum cleaner 10 in this order. In addition to the separation system 14, which here includes a bag filter system, there is preferably another filter to protect the motor 15 in the handheld vacuum cleaner 10. The sucked-in air cools the motor 15 and the battery 22. The sucked-in and cleaned air escapes via the air outlet 20.

The hose 13 is an ordinary plastic hose for a vacuum cleaner. It is characterized by its low weight, flexibility and a certain robustness. It is preferably a so-called corrugated hose. Preferably, the tube 13 has the same, a similar or a slightly larger, for example wise by a maximum of 10, 20 or 30% larger inner diameter than the intake manifold 11.

The handle 12 is a handle for one or two hands. The handle 12 protrudes approximately perpendicularly to the longitudinal axis of the suction tube 11 from this. As a result, the suction pipe 11 can easily be guided parallel over the surface to be cleaned with its longitudinal axis. A shown, so-called handle, carrying handle or loop handle is preferred. As shown, the handle 12 is preferably located near the transition to the hose or in the middle of the suction pipe 11. In this example, the handle 12 comprises a switch 19 for switching the hand-held vacuum cleaner 10 on and off or for actuating it. With actuation is here meant the use of the suction function. In further embodiments, the handle 12 is extendable. In other words, the distance from the suction tube 11 to the handle 12 can be increased in order to be able to clean surfaces, for example high walls or ceilings, with a greater range. The distance from the suction tube 11 to the handle 12 is preferably bridged by a rigid connecting piece. In certain embodiments, this connection is made by at least one telescopic rod.

Air and dust particles are sucked in by negative pressure. This is generated by the motor 15. A motor that is customary for vacuum cleaners is used as the motor 15, for example a series motor or all-current motor or a shaded-pole motor. In order to generate a negative pressure or a pressure ratio, the motor can include and drive a fan. In other words, the motor can be a fan motor. This means that the engine can generate pressure ratios between 1.3:1.0 and 2.9:1.0. According to the invention, the motor can also include and drive a compressor. A greater negative pressure can be generated with a compressor, for example a radial compressor. Furthermore, the motor can include a triac controller, on which the suction power can be adjusted with a variable resistor via the current flow angle. The controller is also used to limit the inrush current.

Rechargeable batteries, also known as rechargeable batteries or accumulators, are primarily suitable as batteries 22 . These preferably contain lithium and/or nickel. Examples are nickel metal hydride, lithium ion and lithium iron phosphate accumulators. In terms of their performance, traction batteries, such as those used for electric bicycles, are suitable.

In this exemplary embodiment, the hand-held vacuum cleaner 10 comprises nine rectangular openings 16. As shown, a plurality of openings 16 are preferably distributed over the length 24 of the suction tube 11. As shown, the openings 16 are preferably located on one side along the longitudinal axis of the draft tube 11 . In this embodiment, the openings 16 are laid out in a single row. In other embodiments, the openings 16 are arranged in multiple rows. The individual openings 16 can also form different shapes on the intake manifold 11, for example round shapes, squares or rectangles.

In this exemplary embodiment, the individual openings 16 are each a simple perforation of the intake manifold 11. In other words, in this exemplary embodiment, the individual opening 16 has the same cross-sectional area in the direction of the longitudinal axis of the intake manifold 11 throughout. In other embodiments, the individual openings are specially shaped, for example the openings are widened or narrowed in the direction of the longitudinal axis of the intake manifold. Thus, the suction of the dust particles can be promoted.

The cross-sectional areas of the various openings 16 are of the same size in this exemplary embodiment. The cross-sectional areas of the various openings are of different sizes in other embodiments. It is advantageous if the cross-sectional areas of the various openings increase with increasing distance from the motor 15. Thus, an approximately similar negative pressure and a similar suction force can be generated through all openings 16 over the length 24 of the suction pipe 11 .

In this exemplary embodiment, the hand-held vacuum cleaner 10 includes nine openings 16. In other embodiments, the plurality of openings are two to 300, preferably three to 100, more preferably five to 80 openings.

In this embodiment, the handheld vacuum cleaner further includes a housing 17 which contains the separation system 14, the motor 15 and a battery 22. The housing 17 includes an attachment system 21 for attaching the housing to a belt. The housing 17 is belted around a user's waist so that the disconnect system 14, the motor 15 and a battery 22 are worn on the waist. This means that the weight that has to be held in the user's hand is once again significantly reduced. The battery 22 can be easily removed from the housing 17 for replacement or for recharging. However, the battery 22 can also be charged in the housing 17 . In this exemplary embodiment, the housing 17 comprises a further switch 19 for switching the hand-held vacuum cleaner on and off or for actuating it. Pressing here means using the suction function. A However, the hand-held vacuum cleaner 10 according to the invention can also only have one switch 19 .

In this embodiment, the suction tube 11 has a length 24 of 55 cm. The advantages are a low weight, good handiness and suction power with a sufficient length for efficient cleaning of large areas.

In this exemplary embodiment, the suction pipe 11 is closed on the end 23 facing away from the hose 13 . Since the longitudinal side of the suction pipe 11 with the openings 16 is moved over the surface to be cleaned for cleaning, an opening at the end 23 facing away from the hose 13 would only cost suction power and suck up little additional dust.

2 shows a section across the longitudinal axis of the intake manifold 11. The inner diameter 25 and the outer diameter 26 can be seen.

In this exemplary embodiment, the suction tube 11 has an inner diameter 25 of 1 cm. The function of the suction pipe 11 is not impaired by a small inner diameter 25 of the suction pipe 11, but material and weight are saved compared to conventional vacuum cleaners.

In this exemplary embodiment, the suction tube 11 has an outer diameter 26 of 1.5 cm. The function of the suction pipe 11 is not impaired by this small outer diameter 26 of the suction pipe, but material and weight are saved compared to conventional vacuum cleaners.

In this exemplary embodiment, the ratio of the inner diameter 25 of the suction pipe 11 to the length 24 of the suction pipe 11 is less than 1/30 or 1/45, namely 1/55. Thus, the intake manifold 11 is disproportionately long. The weight is reduced by a narrow intake manifold. At the same time, the suction pipe 11 can be longer with the same weight and a larger area can be covered by the openings 16 on the surface 27 with a longer suction pipe 11 .

The separation system 14 for separating dust particles comprises a system customary for vacuum cleaners. It preferably includes a bag filter system, but cyclone separation systems or water filter systems can also be included according to the invention. The advantage of a bag filter system is that the bag filter system does not require regular emptying, so it is user-friendly.

In this exemplary embodiment, the hand-held vacuum cleaner 10 comprises, on the outside of the suction tube 11, in the area of the openings 16, a fabric 18 which comprises electrostatic material and microfibers. The fabric 18 with electrostatic material and microfibers becomes electrostatically charged by friction, for example when being passed over a surface, and attracts dust particles. The microfibers result in a very large area so that the fabric 18 can hold a large amount of dust. An advantage of the fabric 18 containing electrostatic material and microfibers is that this fabric carries dust particles into the vicinity of the openings 16 and thus aids in suction. Such a fabric is also advantageous if, for some reason, the suction power of the handheld vacuum cleaner 10 is insufficient to suck up all of the dust particles. In this case, the hand-held vacuum cleaner 10 is supported by such a fabric. If, for example, the battery 22 is empty, a surface that has not yet been cleaned can be cleaned simply by wiping with the suction tube 11 . The shape of the at least one fabric 18 with electrostatic material and microfibers is adapted to the openings 16 . A further advantage of the at least one fabric 18 with electrostatic material and microfibers is that sensitive surfaces, for example those of screens, glass surfaces, windows, plants and furniture, are protected and not scratched. So-called vacuum cleaner brushes can also be attached to the suction tube 11 for this purpose.

The hand-held vacuum cleaner 10 of this exemplary embodiment enables surfaces to be cleaned easily and efficiently. In addition, lowering the weight to be held allows the less able or elderly to use a hand held vacuum.

The hand-held vacuum cleaner 10 of this exemplary embodiment of the invention has the advantage that the suction tube 11 with its nine openings 16 distributed over the length 24 of the suction tube 11 can be guided over the surface to be cleaned without effort. The nine openings 16 cover a large area. With the hand-held vacuum cleaner 10 according to the invention, it is not necessary to guide an opening exactly to the point to be cleaned.

In addition, the weight of a floor nozzle or a nozzle head and the usually heavy joint are eliminated. Apart from the weight load from the floor nozzle or the nozzle head and the joint, these components shift the center of gravity of the suction tube away from the handle, which makes operation more difficult and also more strenuous. In a hand-held vacuum cleaner 10 according to the invention, the center of gravity of the suction tube is closer to the handle 12, which makes it easier to use. The ones in this Embodiment described shifting the weight of the separation system for the separation of dust particles 14, the motor 15 and the battery 16 on the hip, reinforce the advantages already described. Especially with sensitive surfaces such as screens, glass surfaces, windows, walls, plants and furniture, it is important to guide the hand vacuum cleaner gently and evenly over the surfaces in a controlled manner, which is the case with a hand vacuum cleaner 10 according to the invention because of the nine openings 16, the reduced to hold weight and the advantageous center of gravity is possible.

The preferred embodiments and advantages when using a vacuum cleaner 10 according to the invention result in the same way from the exemplary embodiment presented here. The preferred exemplary embodiments and advantages of a suction pipe 11 can also be derived from this exemplary embodiment.

Reference List

10

hand vacuum cleaner

11

intake manifold

12

Handle

13

Hose

14

Separation system (to separate dust particles)

15

engine

16

opening

17

Housing

18

tissue and/or brush

19

Switch

20

air outlet

21

Fastening system for a belt or a belt system

22

battery

23

End of the suction tube facing away from the hose

24

length of the suction pipe

25

Inner diameter of the intake manifold

26

Outside diameter of the intake manifold

27

surface

Claims (12)

A hand-held vacuum cleaner (10) for cleaning surfaces, comprising: - a suction tube (11) with a handle (12) extending along a longitudinal axis and having a surface (27) for sucking in air and dust particles; - A separation system (14) for separating the dust particles; - A hose (13) for connecting the separation system (14) to the suction pipe (11); - a motor (15) for generating a negative pressure such that the air and dust particles from the suction pipe (11) are fed to the separating system (14); - a battery (22) for supplying the motor (15) with electricity; characterized in that the suction pipe (11) has several openings (16) on the surface (27) for sucking in the air and dust particles, the suction pipe (11) has a length of 20 to 100 cm and an inner diameter of less than 2 cm, wherein the ratio of the inner diameter (25) of the suction tube (11) to the length (24) of the suction tube (11) is less than 1/30, and the handle (12) extends approximately perpendicularly to the longitudinal axis of the suction tube (11) from the suction tube (11) protrudes. handheld vacuum cleaner (10). claim 1 , characterized by : a housing (17) with a fastening system (21) for fastening the housing (17) to a belt or belt system, the housing (17) containing the disconnection system (14), the battery (22) and/or the motor (15) contains. handheld vacuum cleaner (10). claim 1 or 2 , characterized in that the suction tube (11) contains plastic and / or is in one piece. Hand-held vacuum cleaner (10) according to one of the preceding claims, characterized in that the suction pipe (11) has a length (24) of 20 to 60 cm. Hand-held vacuum cleaner (10) according to one of the preceding claims, characterized in that the suction tube (11) is closed on the end (23) remote from the hose (13). Hand-held vacuum cleaner (10) according to one of the preceding claims, characterized in that the suction pipe (11) has an inside diameter (25) of less than 1.5 cm. Hand-held vacuum cleaner (10) according to one of the preceding claims, characterized in that the suction tube (11) has an outside diameter (26) of less than 3 cm, in particular less than 2 cm. Hand-held vacuum cleaner (10) according to one of the preceding claims, characterized in that the ratio of the inner diameter (25) of the Intake pipe (11) to the length (24) of the intake pipe (11) is less than 1/45. Hand-held vacuum cleaner (10) according to one of the preceding claims, characterized in that the separating system (14) comprises a filter system, preferably a bag filter system. Hand-held vacuum cleaner (10) according to one of the preceding claims, characterized by : at least one fabric, preferably a cloth, and/or at least one brush (18), which is/are attached to the outside of the suction tube (11), preferably in the area of the openings (16 ), wherein the web preferably comprises electrostatic material and/or microfibers. Use of a hand-held vacuum cleaner (10) according to one of the preceding claims for removing dust particles from surfaces, in particular from screens, glass surfaces, windows, walls, plants and/or furniture. Suction tube (11) with handle (12) for a vacuum cleaner, which extends along a longitudinal axis and has a surface (27) for sucking in air and dust particles, characterized in that the suction tube (11) on the surface (27) has several has openings (16) for sucking in the air and dust particles and is closed on the end (23) facing away from a hose (13), the suction pipe (11) has a length of 20 to 100 cm and an inner diameter of less than 2 cm, wherein the ratio of the inner diameter (25) of the suction tube (11) to the length (24) of the suction tube (11) is less than 1/30, and the handle (12) extends approximately perpendicularly to the longitudinal axis of the suction tube (11) from the suction tube (11) protrudes.

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