GB2538842A

GB2538842A - Sliding base plate for a vacuum cleaner nozzle

Info

Publication number: GB2538842A
Application number: GB1604895.1A
Authority: GB
Inventors: Dilger Horst; Steudtner Hans-Joachim
Original assignee: Wessel Werk GmbH
Current assignee: Wessel Werk GmbH
Priority date: 2015-03-24
Filing date: 2016-03-23
Publication date: 2016-11-30
Anticipated expiration: 2036-03-23
Also published as: FR3033998A1; GB2538842B; DE102015104436A1; GB201604895D0; FR3033998B1

Abstract

A sliding base plate for a vacuum cleaner nozzle comprising a suction port 1 into which a suction opening 6 leads, wherein the suction port is defined by a front suction port edge 2 extending from a first end 10 to a second end 10 of the suction port characterized in that the front suction port edge has a concave curvature in longitudinal direction and is located in a plane perpendicular to the bearing surface of the base plate wherein the front suction port edge protrudes more on a bottom side than adjacent to the suction opening. The front suction port edge may have a height difference (fig 2, H) of 0.5 mm to 1.5 mm between the concave curvature apex (fig 2, S) and the ends (10,10), and may be straight in longitudinal direction. The base plate may be embodied as a plastic molded part, have a sliding bevel 4 and an inclined surface 5, and have a plateau 9 extending the length of the suction port parallel to the front suction port edge and arranged between the bevel and front suction port edge.

Description

Sliding Base Plate for a Vacuum Cleaner Nozzle

Description

The invention relates to sliding base plate for a vacuuming cleaner nozzle comprising a suction port, which is molded in on the bottom side and into which a suction opening leads, wherein the suction port is defined by a front suction port edge, which extends from a first end of the suction port to a second end of the suction port.

The front suction port edge forms a boundary of the suction port facing the front side of the vacuum cleaner nozzle. In a top view onto the bottom side of the sliding base plate, it can have a straight course, a course, which is offset several times, or also a curved course, and preferably extends from the first end of the suction port to the second end of the suction port across the entire working width of the sliding base plate without interruption. Optionally, the front suction port edge can have a stepped recess in the area of a thread lifter, which is set in the sliding base plate.

The suction port geometry can be chosen freely in the context of the invention. In particular, the suction port, which is surrounded by the font suction port edge and a rear suction port edge, can have a plurality of sections, which are divided by webs. However, the suction port is preferably embodied as elongate channel, which is surrounded by the front suction port edge on a long side, and which is surrounded by a rear suction port edge on the other long side.

The sliding base plate is intended for a floor suction nozzle, and is in particular suitable for a floor suction nozzle, which has a nozzle body comprising at least one roller as well as a suction head, which is supported on the nozzle body so as to be pivotably movable.

On its end, which faces away from the suction head, the nozzle body has a suction tube connecting piece, which is supported so as to be pivotably movable. The pivot axis of the suction tube connecting piece and the pivot axis between the suction head and the nozzle body forms two joint axes. Such a floor nozzle is thus also identified as "double joint nozzle". The sliding base plate is part of the suction head. As a result of the pivotably movable storage of the suction head, the sliding base plate can adapt to the floor surface in response to a movement of the floor nozzle across a floor surface, which is to be cleaned, and is not subjected to the forces, which are transferred to the nozzle body by means of a suction tube, which is moved by hand.

A sliding base plate comprising the above-described features is known from practice. When vacuuming textile floor surfaces, the sliding base plate bears on the floor surface and is moved across the textile floor surface, by means of alternating forwards and backward movements. In particular the front suction port edge of the sliding base plate makes a significant contribution to the suction characteristics of the nozzle when vacuuming textile floor surfaces. When vacuuming textile floor surfaces, in particular on carpets, the front suction port edge sinks slightly into the carpet pile and thereby seals the suction channel, so that a low pressure with an effective suction can build up inside the suction port, and the absorbed air flow flows around the front suction port edge at a high air speed, wherein dust is loosened from the carpet pile and is entrained by the air flow. If the vacuum cleaner nozzle is operated in combination with an low-wattage suction blower, which has an electrical power of less than 900 W, the suction port edges sink less deeply into the textile floor surface and a smaller low pressure consequently appears in the suction port. The suction effect then decreases significantly, specifically in end sections of the suction port, which are spaced far away from the suction opening, which, as a rule, is arranged in the center.

Against this background, the invention is based on the problem of specifying a sliding 20 base plate for a vacuum cleaner nozzle, which effectively absorbs dirt on textile floor surfaces across its entire working width.

A sliding base plate according to claim 1 is the subject matter of the invention and the solution of this problem.

According to the invention, the front suction port edge of the sliding base plate has a concave curvature in longitudinal direction, wherein the concave curvature is located in a plane, which is perpendicular to the bearing surface of the sliding base plate, and wherein, as a result of the concave curvature on the two ends of the suction port, the front suction port edge protrudes more on the bottom side than in a section, which is adjacent to the suction opening. Preferably, the front suction port edge, which is embodied with a curvature according to the invention, extends from a first end of the suction port to a second end of the suction port without interruption. The embodiment of the front suction port edge according to the invention has the result that the suction port edge sinks into the carpet pile or the textile floor covering, respectively, more strongly as the distance from the suction opening, which is preferably arranged in the center, increases, and consequently works better. As a result of the proximity to the suction opening, a sufficient low pressure always appears in the area of the suction opening and in sections of the suction port, which are adjacent to the suction opening, so that a slighter penetration depth of the front suction port edge into the carpet pile in this area does not have a negative impact. As a whole, the dust abruption on carpet surfaces, in particular on velour carpets, can be improved by means of the curvature of the front suction port edge according to the invention.

It goes without saying that the concave curvature must not be pronounced too much. A suitable curvature of the front suction port edge can be determined by means of a few orienting tests. Preferably, the height difference on the front suction port edge between the apex of the concave curvature and the ends of the front suction port edge has a value of between 0.5 mm and 1.5 mm. A value of between 0.6 mm and 1.0 mm is particularly preferred.

According to an advantageous embodiment of the invention, the sliding base plate is 15 embodied as plastic molded part, which can be produced as injection molded part with narrow production tolerances.

Advantageously, the front suction port edge is an edge, which is straight in longitudinal direction and which extends across the entire working width of the sliding base plate 20 without interruption.

The sliding base plate can have a sliding bevel in working direction upstream of the suction port and can have an inclined sliding surface in working direction downstream from the suction port. A plateau, which extends across the entire length of the front suction port edge parallel thereto on the level of the front suction port edge, is thereby preferably arranged between the sliding bevel and the front suction port edge. The plateau contributes to an effective sealing of the suction port on the floor surface, so that absorbed air enters into the suction port at a high flow speed on the bottom side of the suction port edge. The dust, which is loosened from the textile pile of the floor surface by means of the air flow, reaches into the suction port by means of the air flow, which flows around the plateau. Due to the fact that the sliding base plate can be produced as injection molded plastic part with low production tolerances, for example, the plateau has a defined, preferably a constant width, across the entire working width of the sliding base plate. As a result, defined flow ratios adjust on the front suction port edge, when the sliding base plate is moved across a textile floor surface. The plateau adjoining the front suction port edge thereby also improves the sliding characteristics of the sliding base plate on textile floor surfaces. The plateau contributes to the font suction port edge not being able to bury itself in the textile pile in response a forwards movement of the sliding base plate across a textile floor covering, and to the sliding base plate being able to be moved across the textile floor surface with a slight sliding resistance. The embodiment according to the invention combines good suction characteristics by means of a seal of the suction port, which is effective across the entire working width of the sliding base plate, to the floor surface, and a slight sliding resistance in response to a movement of the sliding base plate across the textile floor surface, which is to be cleaned. The sliding base plate is thus in particular suitable for floor nozzles, which are embodied as double joint nozzles. The plateau can in particular have a width of between 2 mm and 5 mm.

The invention will be explained below by means of a drawing, which only represents an exemplary embodiment. Schematically: Fig. 1 shows the bottom view of a sliding base plate for a vacuum cleaner nozzle, Fig. 2 shows the profile of a front suction port edge from the viewing direction A at a scale, which is enlarged greatly as compared to Fig. 1.

The sliding base plate illustrated in Fig. 1 consists of plastic and can be made in one piece as plastic injection molded part with slight dimensional tolerances. The sliding base plate is intended for a vacuum cleaner nozzle for cleaning floor surfaces. It has a suction port 1, which is molded in on the bottom side thereof and which is defined by a front suction port edge 2 and a rear suction port edge 3. The suction port edges 2, 3 form sharp edges. Provision is made in working direction upstream of the suction port 1 for a sliding bevel 4. An inclined sliding surface 5 is located in working direction downstream from the suction port 1. A suction opening 6 leads into the suction port 1. Said suction opening is embodied as window comprising a rectangular base area and is arranged in the center between the ends of the suction port 1. Depressions 7, into which thread lifter strips 8 are placed, are arranged on both sides of the suction port 1. The thread lifter strips 8 advantageously adjoin the surfaces of the sliding bevel 4 and of the sliding surface 5 so as to be flush with the floor.

According to the illustration of Fig. 1, the front suction port edge 2 extends as straight edge across the entire working width A of the sliding base plate without interruption. A plateau 9, which extends across the entire length of the front suction port edge 2 parallel thereto on the level of the front suction port edge 2 at a constant width B, is arranged between the sliding bevel 4 and the front suction port edge 2. The plateau 9 has a width B of between 2 mm and 5 mm. The depression 7 for a thread lifter strip is molded into the sliding bevel 4 and abuts directly against the plateau 9. The sliding bevel 4 has an inclination of between 5° and 7°. In the alternative, it can also be embodied as spherically shaped surface.

The rear suction port edge 3 also extends across the entire working width A of the sliding 5 base plate without interruption. In the exemplary embodiment, the sliding surface arranged in working direction downstream from the suction port 1, has an angle of inclination of approximately 6° and abuts directly against the rear suction port edge 3.

According to the illustration in Fig. 2, the front suction port edge 2 has a concave curvature in longitudinal direction, which is illustrated by means of a radius R, wherein the concave curvature lies in a plane, which is perpendicular to the bearing surface of the sliding base plate, and wherein, as a result of the concave curvature on the two ends 10, 10' of the suction port 1, the front suction port edge 2 protrudes more on the bottom side than in a section, which is adjacent to the suction opening 6. The illustration in Fig. 2 is not true to scale. The height difference H on the front suction port edge 2 between the apex S of the concave curvature and the ends 10, 10' of the front suction port edge 2 has a value of between 0.5 mm and 1.5 mm. A value of between 0.6 mm and 1.0 mm is preferred.

Claims

Claims 1. A sliding base plate for a vacuuming cleaner nozzle comprising a suction port (1), which is molded in on the bottom side and into which a suction opening (6) leads, wherein the suction port (1) is defined by a front suction port edge (2), which extends from a first end (10) of the suction port (1) to a second end (10') of the suction port (1), characterized in that the front suction port edge (2) has a concave curvature in longitudinal direction, wherein the concave curvature is located in a plane, which is perpendicular to the bearing surface of the sliding base plate, and wherein, as a result of the concave curvature on the two ends (10, 10') of the suction port (1), the front suction port edge (2) protrudes more on the bottom side than in a section, which is adjacent to the suction opening (6).
2. The sliding base plate according to claim 1, characterized in that the height difference (H) on the front suction port edge (2) between the apex (S) of the concave curvature and the ends (10, 10') of the front suction port edge (2) has a value of between 0.5 mm and 1.5 mm.
3. The sliding base plate according to claim 1 or 2, characterized in that the sliding base plate is embodied as plastic molded part.
4. The sliding base plate according to one of claims 1 to 3, characterized in that the front suction port edge (2) forms an edge, which is straight in longitudinal direction.
5. The sliding base plate according to one of claims 1 to 4, characterized in that the sliding base plate (2) has a sliding bevel (4) in working direction upstream of the suction port (1) and has an inclined sliding surface (5) in working direction downstream from the suction port (1).The sliding base plate according to claim 5, characterized in that a plateau (9), which extends across the entire length of the front suction port edge (2) parallel thereto on the level of the front suction port edge (2), is arranged between the sliding bevel (4) and the front suction port edge (2).