SK116299A3 - Vacuum cleaner - Google Patents

Abstract

The vacuum cleaner has an electric motor and a suction line opening into a suction opening (2) bounded on its lower side by a base plate (3). Supporting sections (5,6) are curved in cross-section in the direction of movement of the vacuum cleaner to form a wheel rolling surface shape.

Description

The invention relates to a vacuum cleaner with an electric motor and a suction hose leading to a suction mouth, which is delimited on the underside by a bottom plate on which the abutment areas are formed.

BACKGROUND OF THE INVENTION

It is known from dust vacuum cleaners or suction nozzle-like dust suction or similar devices that the suction mouth is defined on the lower side facing the floor to be treated by a bottom plate, in particular upstream and downstream of the suction mouth. These bottom plates are generally made of metallic materials. During the vacuuming of the textile floor coverings, a dust vacuum cleaner or an imaginary device, particularly in the area of the suction mouth, slides the bottom plate over the surface to be cleaned. For example, in German patent application no. 295484 shows a cleaning device which is provided with a conventional floor-parallel bottom plate defining a suction mouth.

SUMMARY OF THE INVENTION It is an object of the present invention to improve the vacuum cleaner of the above-mentioned type in order to improve air-conditioning conditions.

SUMMARY OF THE INVENTION

The above mentioned drawbacks of known solutions of this kind are largely eliminated and the problem is solved by a vacuum cleaner with an electric motor and a suction hose leading to a suction mouth, which is delimited at the bottom by a bottom plate on which the bearing areas according to the invention are formed. that the bearing area is curved in the cross-sectional direction in the direction of travel of the vacuum cleaner in the form of a part of a circular arc.

It is also an object of the invention to provide a dust vacuum cleaner in which abutment areas are formed in front of and behind the suction mouth and which are identical.

However, the bearing regions can also be designed differently from one another.

In this case, it is advantageous if the forward abutment region has a smaller radius of curvature in the feed direction than the rear abutment region.

Furthermore, it is advantageous if the contact area on the suction orifice side extends into an edge section which is parallel to the floor to be treated.

The radii of curvature of the abutment regions preferably correspond to 0.25 to 2 times the width of the suction mouth in the feed direction.

It is particularly advantageous if the radii of curvature of the abutment regions correspond to 1/3 to 1/1 times the width of the suction mouth in the feed direction.

The amount of camber of the bearing region relative to the edge section preferably corresponds to 1/8 to 1/2 of the radius of curvature of the bearing region.

The curvature of the abutment regions on the side remote from the suction mouth continues with respect to the edge section above the elevation.

The bearing region extends at least along the length of the suction mouth, measured transversely to the feed direction.

Thus, the bearing area is curved in the cross-sectional direction in the direction of travel of the vacuum cleaner in the form of a part of a circular arc. This measure results in a smaller bearing surface in the region of the bottom plate as compared to the prior art. In known embodiments in which the bottom plate is parallel to the floor, the bearing surface is the entire bottom plate. In addition, embodiments are known in which the rear delimitation of the suction mouth extends in the direction of the floor to be treated in a chamfered direction. With this solution, especially with medium and long pile carpets, the pile is compressed. In addition, this reduces the area through which the exhaust air passes, which in turn leads to an increase in pressure losses when vacuuming the carpet on the floor. In addition, due to the high vacuum thus achieved in the region of the suction mouth, relatively high feed forces are required for the movement of the vacuum cleaner on the treated floor. Due to the embodiment of the bottom plate according to the invention, an increased dust extraction is achieved with at least the same feed force. The abutment region according to the invention has a cross-sectional shape in the shape of a part of a circular arc or is curved in the manner of a profile of the carrier wing. In the latter case, it is important that the greatest curvature is close to the edge of the suction opening. Thus, the profile of the carrier leaf is designed such that, in the normal forward movement of the vacuum cleaner, the rear part of the profile is located at the front. In such a cross-sectioned curved design of the seating area, the carpet on the floor to be treated, in particular the medium and high pile carpet, is sealed only in order to obtain the necessary vacuum, but is not compressed, thereby achieving better airflow. Due to such reduced pressure losses, a higher suction air flow and thus better dust extraction is achieved at the same or even reduced feed forces. In a further embodiment of the invention, in which the abutment regions are formed before and after the suction mouth, the two abutment regions are identical. The lower plate is thus provided in the direction of travel both upstream and downstream of the suction mouth with a contact area having a cross-section in the form of a part of a circular arc or of the profile of the wing. The bottom plate thus formed, which is provided with uniformly curved regions, can be made of both metal and plastic. It is essential that a hard plastic is selected. In a further development of the invention, the abutment regions are designed or shaped differently from one another. In this way, it is possible to achieve that the front abutment region has a smaller radius of curvature in the feed direction than the rear abutment region. In addition, it is proposed that the contact area on the suction orifice side extends into an edge section that is parallel to the floor to be treated. This edge section is raised relative to the abutment surfaces of the abutment regions so that it does not fit tightly on the treated floor. As a result, this edge section parallel to the floor does not adversely affect the vacuuming of the carpet or the feed force. According to the invention, the cross-sectional areas of the abutment regions are in the form of portions of circular arcs or of the profile of the wing, and may consist, for example, of mutually adjacent circular arcs with mutually different radii. In this direction, it is proposed that the radii of curvature of the abutment regions correspond to 0.25 to 2 times the width of the suction mouth in the feed direction. It is particularly advantageous in this case in which the radii of curvature of the abutment regions correspond to 1/3 to 1/1 times the width of the suction mouth in the feed direction. For example, the curvature ratio in the direction of travel of the forward abutment region to the width of the suction mouth is thus about 2: 1, while for the rear abutment region this ratio is about 1.5: 1. In addition, in order to better vacuum the dust, it is proposed that the elevation of the bearing area relative to the edge section corresponds to 1/8 to 1/2 of the radius of curvature of the bearing area. Furthermore, it is also proposed that the curvature of the abutment regions on the side remote from the suction mouth continues to extend beyond the elevation. As a result of these measures, a uniformly gradual start-up zone is achieved in both the forward and reverse directions in the region of the actual forward abutment region, thereby reducing the feed forces, especially on medium and high pile carpets. Finally, provision can also be made for the bearing region to extend at least along the length of the suction mouth, measured transversely to the direction of travel. In this way, an even sealing of the treated carpet floor is achieved over the entire length of the suction mouth, thus achieving the necessary vacuum. The bottom plate according to the invention does not adversely affect either the removal of fibers, threads or coarse soils or the vacuuming of edges and vertical surfaces in comparison with conventional lower plates. In addition, the base plate is comparable to the conventional base plates as far as acoustics and design are concerned. When vacuuming from cracks and joints, an increase in vacuum efficiency has been observed.

BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS The invention is illustrated by the following non-limiting examples, which are described in the accompanying drawings, in which:

FIG. 1 shows an exemplary device for a vacuum cleaner according to the invention;

FIG. 2 is a schematic cross-section along II-II of FIG. 1;

FIG. 3 is a view of the representative device of FIG. 1 from below;

FIG. 4 is a detailed perspective view of the bottom plate of the presentation device.

DETAILED DESCRIPTION OF THE INVENTION

In FIG. 1 shows an exemplary vacuum cleaner device 1 which is designed as a suction nozzle for a vacuum cleaner (not shown).

The present device 1 is provided on the underside with a suction mouth 2, which is connected by air-conditioning with a vacuum cleaner in which the electric motor driving the fan is located.

As shown in FIG. 2, the suction mouth 2 is in the direction of VR travel of the representative device j. both on the front side and on the rear side defined by the bottom plate 3 by which this representative vacuuming device 11 rests on the floor to be treated 4.

It is further evident from this cross-sectional representation that a front abutment region 5 and a rear abutment region 6 are formed on the bottom plate 3, seen in the VR feed direction. These abutment regions 5, 6 have a cross-section in the feed direction VR in accordance with FIG. . 2 arc shape.

These abutment regions 5.6 with circular cross-sectional shapes have different radii r *, r 'to each other. wherein the radius r * of the front into the planting region 1 corresponds to approximately half the width b of the suction mouth 2 measured in the direction of travel VR. In the illustrated embodiment, the radius r 'of the rear abutment region 6 corresponds to approximately 0.7 times the width b of the suction mouth

Second

The abutment areas 5, 6 are arched towards the treated floor 4, resulting in a greater or less abutment surface depending on the floor covering. Thus, the present device 6 is supported on the treated carpet floor 4 with a low pile height in the area of the suction mouth 2 in a cross-sectional area. For medium to high pile heights of the carpet of FIG. 2, small bearing surfaces are formed which are smaller in the feed direction VR than the widths of the bearing areas 5 measured in the same direction. 6. Thus, the feeder device 4 abuts the treated floor 4 in the region of the suction mouth 2 only with a part of the total surface of the bottom plate 1.

The abutment areas 5, 6 extend towards the suction mouth 2 into the edge sections 7 which are parallel to the floor 4 to be treated. These edge sections 7 are therefore higher relative to the apexes of the respective abutment areas 5. The height of this elevation u corresponds to that shown. approximately an eighth of the radius r * of the front abutment region 5. Due to this embodiment, the edge sections 7 extend above the area of abutment of the representative device 4 on the treated floor 4 and thus do not cause interference.

The curvature of the individual abutment regions 5, 6 protrudes on the sides remote from the edge sections 7 above the elevation u. so that in the feed direction VR and in the opposite direction, gradual rise zones Z are formed.

From the bottom view of FIG. 3 it can be seen that the abutment regions 5, 6 extend at least along the length θ of the suction mouth 2 measured transversely to the feed direction VR. It is also further evident that the two separate bearing areas 5, 6 are connected to one another by bridges 8 to form an integral bottom plate 3, which extend through the suction mouth 2.

The bottom plate 3 according to the invention is preferably made of a metallic material. However, it is also conceivable for it to be made of hard plastic or the like.

Due to the design of the bottom plate 3 according to the invention, a good sealing of the treated floor 4 with the carpet is achieved in order to obtain the necessary vacuum, while the curved bearing areas 5, 6 prevent the carpet from squeezing on the treated floor 4. FIG. 2, which contributes to the desired flow in the area of the suction mouth 2 and to better dust entrainment, without the need to increase the suction power of the vacuum cleaner.

In addition to the achieved improvement of the bottom plate 1, the embodiment according to the invention also achieves a reduction in the force required to move the representative device 1 over the treated floor 4, especially in the case of medium and high pile carpets.

The features of the invention apparent from the foregoing description, drawings and claims may be relevant to the practice of the invention both individually and in any combination. All the features described are essential to the invention. It is also within the scope of the invention that the content of the relevant priority application be fully embodied.

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Claims (10)

PATENT CLAIMS Dust vacuum cleaner with an electric motor and a suction hose leading to a suction mouth (2) which is delimited on the underside by a bottom plate (3) on which the abutment areas (5, 6) are formed, characterized in that the abutment area (5) 6) is curved in the shape of a part of a circular arc in the cross-sectional direction (VR) of the vacuum cleaner. Dust vacuum cleaner according to claim 1 or particularly according to this claim, wherein abutment regions (5, 6) are formed upstream and downstream of the suction mouth (2), characterized in that the two abutment regions (5, 6) are identical. Dust vacuum cleaner according to one or more of the preceding claims or in particular according to these claims, characterized in that the abutment regions (5, 6) are different from each other. Dust vacuum cleaner according to one or more of the preceding claims or in particular according to these claims, characterized in that in the feed direction (VR) the front abutment area (5) has a smaller radius of curvature (r ') than in the feed direction (VR) the abutment area (6). Dust vacuum cleaner according to one or more of the preceding claims or in particular according to these claims, characterized in that the contact area (5, 6) on the suction mouth side (2) passes into an edge section (7) parallel to the treatment. floor (4). Dust vacuum cleaner according to one or more of the preceding claims or in particular according to these claims, characterized in that the radii (r ', r') of the curvature of the abutment regions (5, 6) correspond to 0.25 to 2 times the width (b). the suction mouth (2) in the feed direction (VR). Dust vacuum cleaner according to one or more of the preceding claims or in particular according to these claims, characterized in that the radii (r ', r') of the curvature of the abutment regions (5, 6) correspond to 1/3 to 1/1 times the width ( b) the suction mouth (2) in the direction of travel (VR). Dust vacuum cleaner according to one or more of the preceding claims or in particular according to these claims, characterized in that the amount of camber (u) of the bearing area (5, 6) relative to the edge section (7) corresponds to 1/8 to 1/2 of the radius ( r ', r') of the curvature of the abutment region (5, 6). Dust vacuum cleaner according to one or more of the preceding claims or in particular according to these claims, characterized in that the curvature of the abutment regions (5, 6) on the side remote from the suction mouth (2) continues relative to the edge section (7) above the elevation (u). ). Dust vacuum cleaner according to one or more of the preceding claims or in particular according to these claims, characterized in that the abutment area (5, 6) extends at least along the length (1) of the suction mouth (2) measured transversely to the feed direction (VR) .