CN108294685B

CN108294685B - Chassis for a suction nozzle with air-guiding elements

Info

Publication number: CN108294685B
Application number: CN201810026080.6A
Authority: CN
Inventors: 奥利弗·布雷希; 约尔格·佐默; 多米尼克·迪施; 赖因哈德·雷帝格
Original assignee: Vorwerk and Co Interholding GmbH
Current assignee: Vorwerk and Co Interholding GmbH
Priority date: 2017-01-13
Filing date: 2018-01-11
Publication date: 2021-10-26
Anticipated expiration: 2038-01-11
Also published as: DE102017100608A1; TW201825034A; CN108294685A; DE102017100608B4

Abstract

The invention relates to a chassis for a suction nozzle, having at least one suction opening (4), an upper side (8) and a bottom side (10), wherein a front edge (14), a rear edge (16) and side edges (18) of the chassis (2) define the suction opening (4). This object, which is achieved by the prior art and by the provision of a suction nozzle which, with sufficient cleaning efficiency, permits a comfortable operation of the suction nozzle on a carpet floor, is achieved in that at least one bearing block (18a) is formed on the underside of the side edge (18), an air guide element (22) is formed on the underside of the front edge (14) and the air guide element (22) is formed in the form of projections (22a) spaced apart from one another. The object is also achieved by a suction nozzle (12) having a chassis (2) according to the invention and by a vacuum cleaner (44) having a suction nozzle (12) according to the invention.

Description

Chassis for a suction nozzle with air-guiding elements

Technical Field

The invention relates to a chassis for a suction nozzle, having at least one suction opening, an upper side and a bottom side, wherein a front edge, a rear edge and side edges of the chassis delimit the suction opening, wherein at least one bearing block is formed on the bottom side of the side edges, an air guide element is formed on the bottom side of the front edge and the air guide element is formed as projections arranged at a distance from one another. The invention further relates to a suction nozzle for a vacuum cleaner, comprising a housing, a suction chamber formed in the housing, and a suction channel formed in the housing, wherein the suction chamber is fluidically connected to the surroundings of the suction nozzle, and wherein the suction channel merges into the suction chamber. The invention also relates to a vacuum cleaner having the aforementioned suction nozzle.

Background

A suction nozzle with a chassis, which is also called a hard floor nozzle or a power brush depending on the purpose of use, is typically connected in a fluid-tight manner to the floor cleaner by means of a flexible suction tube and/or a steering tube, as a head unit. In the case of the hand-held vacuum cleaner mentioned, the suction nozzle can also be connected directly in a fluid-tight manner to the base body of the vacuum cleaner.

The suction nozzle usually has a housing in which, for example, a brush chamber for accommodating the brush roller and a motor chamber for accommodating a motor for driving the brush roller and/or a transmission assembly are arranged. The brush roller here usually has a roller body and a plurality of brush filaments, in particular bristles, arranged thereon. The brush filaments may be arranged on the roller body in individual bundles or in the form of brush strips, that is to say in the form of brush filaments arranged next to one another. Particles such as dust particles or dirt particles separated from the floor can be sucked up and entrained by the air flow by the rotation of the brush roller and the simultaneous generation of a suction air flow from the suction opening through the suction chamber to the suction channel.

A chassis is fixed to the bottom surface of the housing, i.e. the portion of the housing that faces the surface to be cleaned in normal operation. Here, it is known from the prior art to provide a chassis which is fixedly mounted on the bottom side of the housing or is removably or detachably mounted on the bottom side of the housing. In normal operation, the chassis is connected to the bottom surface of the housing.

Here, the chassis usually has at least one bottom opening in the form of a suction opening, which connects the suction chamber and preferably the brush chamber with the surroundings of the floor area to be cleaned. When the brush filaments of the brush roll are to be brought into contact with the surface to be cleaned during cleaning, the brush filaments of the brush roll protrude through the suction opening and out through the chassis during normal operation. In other applications, however, it is also possible that the brush wires of the brush roller do not need to be in contact with the surface to be cleaned and do not protrude from the suction opening.

In the suction nozzles known in practice, in particular with a motorized brush roller, it is desirable for the suction opening and the brush filaments of the brush roller to be at a certain distance from the carpet to be cleaned when the suction nozzle is moved over the carpet floor, since otherwise the fibers of the carpet to be cleaned would become entangled in the roller brush and block the suction opening. Furthermore, the suction opening is usually sealed via the edge of the chassis to generate a high underpressure and thus to achieve as high a suction of dust as possible by the suction nozzle.

This, in practice, leads to an excessively high negative pressure during the cleaning of the carpet. Thus, the front edge of the chassis often sinks forward into the carpet to be cleaned when the nozzle is moved.

Whereby this front edge can get caught in the fibres of the carpet to be cleaned and thus cannot push the nozzle over the carpet floor in a comfortable manner. But the nozzle can move only in jumps, at least in part, due to the jamming of the front edge with the carpet to be cleaned.

A base plate having a suction opening and an edge delimiting the suction opening is known from JP2013-230198A, wherein a support block delimits the suction opening on the side and wherein square air guide elements are formed at a distance from one another on the bottom side of the edge delimiting the suction opening on the front side.

Disclosure of Invention

It is therefore an object of the present invention to provide a chassis for a suction nozzle which solves the problems known from the prior art and which achieves a comfortable operation of the suction nozzle on a carpet floor while providing a sufficient cleaning effect.

The aforementioned technical problem is solved according to a first aspect of the present invention in that the bearing block is formed in a cap shape.

Here, these edges not only form the boundary of the suction opening, but also form a planar section of the chassis. In addition, according to the invention, a projecting bearing block is provided on the side edge and an air guide element is provided on the front edge.

By means of the bearing block and the air guide element, a regulation of the underpressure in the suction chamber of the head arrangement is achieved, since this makes it possible not only to suck in air from below, but additionally also from the front, by spacing the front edge from the floor by means of the bearing block/air guide element. The function of the air guide element is to provide a hydrodynamically advantageous whirling of the sucked-in air, whereby the base frame achieves a comfortable operation of the suction nozzle on the carpet floor. Thus, it is avoided that the front edge of the chassis sinks into the carpet to be cleaned and thereby jamming of the suction nozzle in the carpet to be cleaned is avoided.

Additionally, the dust suction effect is promoted by sucking air not only from the lower portion but also from the front. This makes it possible, for example, to suck in dirt which is located in front of the chassis as well.

If a brush roller with brush wires is arranged in the suction chamber of the suction nozzle with chassis and the brush wires protrude out of the suction opening for cleaning the floor, the suction effect is further promoted, since a diagonal air flow is generated by sucking air from below and in front, which is matched in an optimum manner to the rotational movement of the brush roller and the brush wires arranged thereon.

According to the present invention, the protrusion is formed in a cap shape. The air flow sucked in through the front edge is influenced by this design of the projection. The cap-like design is particularly advantageous in terms of cleaning effect. By cap-shaped is meant here that the projection is designed in the shape of a spherical segment of a circular arch. It is also within the framework of the invention when not all the projections have exactly the same shape.

According to a preferred embodiment, the bearing block protrudes with respect to the underside of the front edge, preferably with respect to the projection. Thereby ensuring a sufficient distance between the front edge and the floor to be cleaned. By constructing the bearing block deeper than the projection, mainly the bearing block of the chassis comes into contact with the floor to be cleaned, whereby the main load of the entire suction nozzle falls on this bearing block. In such a design, it is possible for the user to run the suction nozzle with the base frame according to the invention on the floor to be cleaned, in particular on a carpet floor, in a comfortable manner by means of the bearing blocks, which are preferably formed as sliders.

It is also preferred that the projection projects preferably 0.5mm to 2mm relative to the bottom face of the front edge. These values have proved to be particularly advantageous in tests for handling comfort and cleaning effectiveness.

It is furthermore preferred that the projections are formed substantially uniformly distributed over the entire extension of the front edge, wherein the projections have a spacing of at least 1mm from one another. By forming the projection over the entire front edge, on the one hand the front edge is no longer sunk into the carpet to be cleaned in a reliable manner over its entire length, and on the other hand a sufficient dust suction effect is ensured over the entire width of the base frame. In tests, it has proved to be particularly advantageous for improved cleaning to have projections at a distance of at least 1mm from one another. It is also possible to form the projection on only a part of the front edge. The spacing of the projections from each other may also be different.

According to a further preferred embodiment, the projections have a width or maximum diameter of 2mm to 4 mm. This design was developed experimentally and likewise promotes improved cleaning in relation to other widths or diameters.

The chassis is preferably manufactured as a die-cast part made of plastic, preferably polyamide. The injection molding process makes it possible to produce the chassis economically in large numbers. Plastics are particularly suitable as a raw material for the injection molding and, when polyamide is used as a raw material, the chassis has high strength and toughness, which results in less wear of the chassis.

It is furthermore preferred that the roller is rotatably mounted in the front edge and/or the rear edge, wherein the roller is preferably spaced apart from the side edge by preferably at most 10cm, in particular at most 5 cm. Possible floor damage is avoided by the rollers in the front edge. Furthermore, the operating behavior of the suction nozzle is improved, since the chassis additionally has rollers in addition to the bearing blocks or is placed on the floor to be cleaned with rollers. The chassis preferably has rollers in the front edge or the rear edge.

The chassis may be formed in one piece with the housing of the nozzle. Alternatively, the chassis may have at least one connecting element, whereby the chassis may be detachably connected with the housing. The connecting element is preferably designed as a snap-in element. Here, the nozzle housing described below has corresponding latching elements for locking the chassis and the housing. The chassis and accordingly also the housing can have a plurality of connecting or latching elements, for example latching means and/or hooks. This enables a quick and reliable mounting of the chassis on the base or a removal of the chassis for maintenance or replacement of the at least one brush by a user. Alternatively, it is also possible to design the connecting element as a device for a bayonet connection or as a device for a screw connection.

The aforementioned technical problem is solved according to a second aspect of the present invention in that the suction nozzle has a chassis as described above. The advantages of this design are given in the description of the chassis according to the invention.

According to a preferred embodiment, a rotatable brush roller is mounted in the suction chamber, the brush roller having a roller body and brush filaments. The arrangement of the brush roller contributes to a significantly improved cleaning efficiency, in particular in the cleaning of carpet floors.

It is also preferred that the nozzle has at least one retractable and extendable sealing lip for sealing the suction opening to a hard floor, preferably for sealing the front and rear edges of the nozzle. For the cleaning of hard floors, it is advantageous to provide the suction chamber as hermetically as possible to ensure a sufficient suction effect. Here, it is preferred not to seal the sides of the suction nozzle in order to ensure a high suction effect also at seams running obliquely or horizontally to the direction of travel of the suction nozzle. This is important in particular for the optimization of the cleaning grade of the suction nozzle on hard floors. The at least one sealing lip may advantageously be rolled out/extended on a hard floor and retracted/retracted on a soft carpeted floor. Thereby improving the cleaning effect. It is also within the meaning of the invention when forming a sealing lip that seals the side edge of the suction opening.

According to a further preferred embodiment, the suction nozzle has at least one retractable and extendable support wheel for spacing the suction nozzle from the hard floor to be cleaned. For example, the at least one support wheel may be placed in a given operating position on a hard floor, such as a hard floor, to increase the spacing between the chassis and thus the suction opening and the surface to be cleaned. When the surface is changed to a soft floor, such as a carpet, the support wheel can be brought into another defined operating position, in order to reduce the spacing between the chassis or the suction opening and the surface to be cleaned, in particular. Improved dust extraction can thereby be achieved. This is particularly advantageous in combination with the aforementioned sealing lips which can be retracted and extended.

It is also preferred that the chassis is detachably connected to the housing by means of a screw connection, a bayonet connection or preferably a snap connection. This enables a quick and reliable mounting of the chassis to the base or a removal of the chassis for maintenance or replacement of the at least one brush by a user.

This previously mentioned technical problem is solved according to a third aspect of the invention in that the vacuum cleaner has a suction nozzle as described above. Here, the vacuum cleaner is preferably connected to the suction nozzle in a fluid-tight manner by means of a flexible suction hose and/or a suction duct.

Drawings

The invention is further illustrated by the following schematic drawings showing one or more embodiments. In the figure:

figure 1 shows a perspective view from obliquely below of a first embodiment of a chassis for a suction nozzle according to the invention,

figure 2 shows an embodiment of a chassis for a suction nozzle according to the invention from an oblique upper perspective,

figure 3 shows a perspective view of a first embodiment of a suction nozzle according to the invention with a first embodiment of a chassis according to the invention,

figure 4 shows a perspective view of a first embodiment of a suction nozzle according to the invention with a second embodiment of a chassis according to the invention,

figure 5 shows a vacuum cleaner having a suction nozzle according to the invention.

Detailed Description

In the following description of different embodiments according to the invention, components and elements having the same function and working manner will be denoted by the same reference numerals even though they have different sizes or shapes in different embodiments.

Fig. 1 shows a perspective view obliquely from below of a first embodiment of a chassis 2 for a suction nozzle 12 according to the invention. Thus, in this view, the bottom surface 10 of the chassis 2 is shown. Here, the chassis 2 has a suction opening 4 which is defined by and by a front edge 14, a rear edge 16 and two side edges 18. The

edges

14, 16 and 18 not only form the boundary of the intake opening 4, but also form a planar section of the chassis 2. Additionally, the side edges 18 are formed as bearing blocks 18 a.

On the upper side of the front edge 14 and the rear edge 16, connecting elements 6 for detachably mounting the chassis 2 in the suction nozzle 12 are arranged. In the view shown in fig. 1, the connecting element 16 arranged on the rear edge 16 is only partially visible.

Along the bottom side of the front edge 14, hat-shaped projections 22a are formed which are distributed uniformly over the bottom side of the front edge 14 and accordingly have a substantially identical spacing from one another. The cap-shaped protrusion 22a is formed in a spherical-truncated shape in a circular arch shape.

It can furthermore be seen that the bearing block 18a projects beyond the projection 22a and that the projection 22a therefore does not or hardly come into contact with the floor to be cleaned during cleaning. The front edge 14 and the projections 22a formed on the front edge 14 can in particular not become jammed in the fibers of the carpet to be cleaned when cleaning the carpet, thereby improving the pushing properties of the suction nozzle 12.

Fig. 2 shows a perspective view of the base frame 2 from above at an angle according to fig. 1. So that in this view the upper side 8 of the chassis 2 can be seen. It can be seen that the suction opening 4 is divided into a plurality of smaller suction openings 4a by a web 5. Also visible in this view is a bearing block 18a formed on the underside of the side edge 18.

The chassis 2 is detachably connected to the housing 26 of the suction nozzle 12 on its housing bottom surface by means of the fixing element 6 a. The snap-in elements 6a are provided in particular to snap the chassis 2 with corresponding snap-in elements (not shown) on the housing 26.

In fig. 3 is shown a perspective view of a suction nozzle 12 with a first embodiment of a chassis 2. The chassis 2 is connected to the housing 26 of the suction nozzle 12 by means of the connecting element 6. In the bottom side of the housing 26, a further opening 15 for a sensor of the type for detecting the floor to be cleaned is provided, which is formed as an ultrasonic sensor 17.

The nozzle 12 additionally has a front sealing lip 38 and a rear sealing lip 40. Which can be rolled out (hard floors) or rolled back (carpeted floors) depending on the type of floor detected. This process is preferably carried out automatically and in dependence on the analysis of the ultrasonic sensor.

In addition, a push switch 9 is additionally provided on the bottom of the housing 26, which enables an adjustment of the sealing

lips

38 and 40 or of an additional support wheel. A rotatable brush roller 32 is also mounted in the intake chamber, the brush roller 32 having a roller body and brush filaments 36.

Fig. 4 shows a perspective view of a suction nozzle 12 with a second embodiment of a chassis 2. In contrast to the previous embodiment, the chassis 2 here has two rollers 24 in the front edge 14, which are each arranged on the edge of the front edge 14. Possible floor damage due to the projection 22a is avoided by the roller 24 in the front edge 14, since it is the roller 24 that is in contact with the floor to be cleaned and not the projection 22 a. The rollers 24 preferably protrude from the bottom surface of the front edge 14 to the same extent as the bearing blocks 18 a.

Fig. 5 shows a vacuum cleaner 44 according to the invention with a suction nozzle 12 according to the invention. The illustrated vacuum cleaner 44 is a hand-held vacuum cleaner 44 with a suction nozzle 12 according to the invention. The general form of the exemplary handle guided vacuum cleaner 44 here generally has a base housing 46 or base body in which a suction/blower unit, not shown, is arranged. An intake air flow can be generated by the unit.

In the base housing 46 there is a filter device 48 with a filter bag not shown here. The suction air loaded with dirt is filtered by the filter bag.

In order to guide the vacuum cleaner 1, a retractable device handle is provided on the vacuum cleaner, which is attached to the base housing 46. The handle has a grip 13 at the end. The current supply takes place here via the electrical line 19 into the handle 13.

The head part 12, which is designed here as a suction nozzle 12, is connected, in particular rotatably and reversibly, to the vacuum cleaner 44 via the connection nipple 21. The head member 12 is guided through a surface to be cleaned (not shown here) in normal operation. The head member 12 has a housing 26 and a chassis 2 placed on the bottom surface of the housing 26.

Claims

1. A chassis for the suction nozzle, which has

At least one suction opening (4),

above (8) and

a bottom surface (10),

wherein the front edge (14), the rear edge (16) and the side edges (18) define the suction opening (4),

wherein at least one bearing block (18a) is formed on the underside of the side edge (18),

wherein an air guide element (22) is formed on the underside of the front edge (14) and

wherein the air-guiding element (22) is formed in the form of mutually spaced projections (22a),

it is characterized in that the preparation method is characterized in that,

the convex portion (22a) is formed in a cap shape, and

the support block (18a) protrudes relative to the boss (22 a).

2. The chassis of claim 1, wherein the chassis is,

it is characterized in that the preparation method is characterized in that,

the projection (22a) projects by 0.5mm to 2mm with respect to the bottom surface of the front edge (14).

3. The chassis of claim 1, wherein the chassis is,

it is characterized in that the preparation method is characterized in that,

the projections (22a) are formed substantially uniformly distributed over the entire extension of the front edge (14), wherein the projections (22a) have a distance of at least 1mm from one another.

4. The chassis of claim 1, wherein the chassis is,

it is characterized in that the preparation method is characterized in that,

the projection (22a) has a width or maximum diameter of 2mm to 4 mm.

5. The chassis of claim 1, wherein the chassis is,

it is characterized in that the preparation method is characterized in that,

a roller (24) is rotatably mounted in the front edge (14) and/or the rear edge (16), wherein the roller (24) is spaced apart from the side edge (18) by a maximum of 10 cm.

6. The chassis of claim 5, wherein the first and second end portions of the chassis,

it is characterized in that the preparation method is characterized in that,

the roller (24) is spaced from the side edge (18) by a maximum of 5 cm.

7. A suction nozzle for a vacuum cleaner having

A shell (26) is arranged in the shell,

a suction chamber formed in the housing (26) and

an air intake passage formed in the housing (26),

wherein the suction chamber is connected to the surroundings of the suction nozzle (12) in a hydrodynamic manner, and

wherein the suction channel opens out into the suction chamber,

it is characterized in that the preparation method is characterized in that,

the suction nozzle (12) has a chassis (2) according to any one of claims 1 to 6.

8. The suction nozzle as set forth in claim 7,

it is characterized in that the preparation method is characterized in that,

a rotatable brush roller (32) is mounted in the suction chamber, wherein the brush roller (32) has a roller body and brush filaments (36).

9. The nozzle according to claim 7 or 8,

it is characterized in that the preparation method is characterized in that,

at least one retractable and extendable sealing lip (38, 40) is provided for sealing the suction opening (4) to a hard floor.

10. A vacuum cleaner for cleaning the floor is provided,

it is characterized in that the preparation method is characterized in that,

the vacuum cleaner (44) having a suction nozzle (12) according to any one of claims 7 to 9.