EP3476535B1 - Floor grinding apparatus with dust-tight rings - Google Patents

Description

The present invention relates to a floor grinder with dust seal rings.

A variety of floor grinders are available for processing floors, such as in the DE 20 2013 010 625 U1 described for use. Such floor grinders generally have a holding plate for an abrasive, a drive device to set the holding plate in motion, a suction opening for sucking off the dust that is produced, and a dust sealing ring.

JP H10 277938 A discloses a floor grinder according to the preamble of claim 1.

When sanding floor surfaces, a large amount of dust is generated, which spreads throughout the room and makes it necessary to laboriously clean the floor after the sanding process. Vacuum cleaners are used, which are intended to suck off the resulting dust immediately after it is created. However, a significant amount of dust can escape from the environment of a floor grinder before it can be picked up by the vacuum cleaner.

Against this background, the object of the present invention is to reduce the pollution of the environment caused by the dust produced during processing with a floor grinding device.

According to the invention, this object is achieved by a floor grinder having the features of patent claim 1.

Accordingly, a floor grinder is provided. The floor grinder comprises a housing, which has an interior space that is open on one side, a holding plate rotatably mounted in the interior space for receiving an abrasive, and a drive device, which is designed to set the holding plate in rotation, the housing an inner dust sealing ring with at least one recess, at least one suction opening, which is arranged in the outer section, and an outer dust sealing ring, which encloses the interior, the inner dust sealing ring dividing the interior into an inner section and an outer section, the retaining plate in the inner portion, and the inner dust seal ring and the outer dust seal ring are arranged such that they define a common working plane parallel to the plane of rotation of the support plate.

The idea on which the present invention is based is to guide the dust produced during the processing of the floor through a recess in the inner dust sealing ring to the suction opening. The outer dust seal ring prevents the escape of dust passed through the recess as well as dust escaping elsewhere through the inner dust seal ring.

Accordingly, the resulting dust can be sucked off particularly effectively since it is either conducted directly to the suction opening or can be held in the outer section of the interior long enough until it is caught by the suction opening.

Advantageous refinements and developments result from the dependent claims and from the description with reference to the figures.

According to a development, the floor grinder can also include a suction device which is in operative connection with the at least one suction opening. The integration of the suction device into the floor grinder makes it unnecessary to use a separate suction device.

According to a further exemplary embodiment, a plurality of suction openings can be provided, with each suction opening being connected to the suction device via a separate hose. In this way hoses that are as simple as possible can be used, which are therefore also particularly easy to manufacture, assemble and maintain.

According to a further exemplary embodiment, the housing can have a flattened disc shape. This allows the floor grinder to reach areas of the floor that are otherwise difficult to access, such as under radiators attached to a wall.

According to a further exemplary embodiment, the holding plate can be movably mounted in a direction parallel to the axis of rotation. This ensures that the attached abrasive lies on the surface to be processed, regardless of its thickness.

According to a further exemplary embodiment, the holding plate can be designed to accommodate a plurality of grinding means in an annular arrangement. In this way, the entire surface to be processed is covered and individual abrasives can be replaced without great effort if necessary.

According to a further embodiment, the drive device can be designed in the form of an electric motor. Electric motors are mainly for use advantageous in closed rooms because, in contrast to internal combustion engines, they cause significantly less noise and exhaust emissions.

According to a development, the floor grinder can also include a battery, which is connected to the drive device. This means that the floor grinder can also be used in places where there is no electrical connection.

According to a further exemplary embodiment, the floor grinding device can have the same number of recesses and suction openings.

According to a further embodiment, each suction opening can be assigned to a recess. As a result, the dust generated during processing is guided particularly effectively to the respective suction opening.

According to a development, the inner dust sealing ring can have two recesses and the housing can have two suction openings, with the recesses and the suction openings assigned to them being arranged on opposite sides of the inner section. This configuration represents a particularly advantageous compromise between the smallest possible number of suction openings and the maximum possible suction of the dust produced.

According to a further exemplary embodiment, the inner dust sealing ring and the outer dust sealing ring can have brushes. This ensures that the dust produced cannot escape through the dust sealing rings, even when working on uneven floors.

According to a further embodiment, the at least one recess can be designed as a recess in the inner dust sealing ring. This is a particularly simple way of realizing the recess.

According to a further development, at least one of the suction openings can be opened towards the interior at an angle of 45° in relation to the working plane. This makes it easier to suck off the dust that is produced, as this is subjected to a horizontal speed by the rotating processing of the floor.

According to a further embodiment, the floor grinder can also comprise at least two rollers, which are arranged offset to the working plane. This allows the floor grinder to be easily transported from one place of use to the next.

Fig. 1

eine schematische Unteransicht eines ersten Ausführungsbeispiels eines Bodenschleifgerätes;

Fig. 2

eine schematische Seitenansicht des ersten Ausführungsbeispiels aus Fig. 1;

Fig. 3

eine schematische Unteransicht eines zweiten Ausführungsbeispiels eines Bodenschleifgerätes;

Fig. 4

eine schematische Seitenansicht des zweiten Ausführungsbeispiels aus Fig. 3;

Fig. 5

eine schematische Draufsicht auf ein drittes Ausführungsbeispiel eines Bodenschleifgerätes.

The present invention is explained in more detail below with reference to the exemplary embodiments given in the schematic figures. They show:

1

a schematic bottom view of a first embodiment of a floor grinder;

2

a schematic side view of the first embodiment 1 ;

3

a schematic bottom view of a second embodiment of a floor grinder;

4

a schematic side view of the second embodiment 3 ;

figure 5

a schematic plan view of a third embodiment of a floor grinder.

The accompanying figures are intended to provide a further understanding of embodiments of the invention. They illustrate embodiments and, together with the description, serve to explain principles and concepts of the invention. Other embodiments and many of the foregoing advantages will become apparent by reference to the drawings. The elements of the drawings are not necessarily shown to scale with respect to one another.

In the figures of the drawing, elements, features and components that are the same, have the same function and have the same effect--unless stated otherwise--are each provided with the same reference symbols.

1 shows a schematic bottom view of a floor grinder 100. In this figure, the side of the floor grinder 100 facing the working surface can be seen. A disk-shaped housing 110 defines an interior space visible from this perspective. Located centrally in the cylindrical interior there is a circular, rotatably mounted support plate 120 to which one or more abrasives, not shown, can be attached. The housing 110 includes a circular inner dust seal ring 111 which encloses the retaining plate 120 and divides the interior space into an inner section and an outer section. The inner dust sealing ring 111 further comprises a recess 113 in the form of a recess of the inner dust sealing ring 111. In the outer section there is a circular suction opening 114 which is arranged adjacent to the recess 113 and is associated with it. The interior is completely enclosed by an outer dust sealing ring 112 of the housing.

According to the invention, when the floor grinding device 100 is in operation, both the grinding means or means fastened to the holding plate 120 and the inner dust sealing ring 111 and the outer dust sealing ring 112 are in contact with the surface to be machined. As the holding plate 120 rotates, the abrasive removes soil material, which is thrown away from the abrasive as dust. The inner dust sealing ring 111 advantageously prevents the escape of at least a large part of the dust and directs it through the recess 113 from the inner section to the outer section. In the outer section, the dust is sucked off by the negative pressure applied to the suction opening 114 . The outer dust sealing ring 112 prevents the dust from leaving the outer section and thus the interior. Also, the rest of the dust escaping through the inner dust seal ring 111 at locations other than the recess 113 is held in the outer portion by the outer dust seal ring 112 until it is advantageously sucked out through the suction opening 114 .

The housing 110 can be made from a variety of materials, such as plastic, metal, or a combination of both. have plastics usually a low weight, which can be advantageous for the transport of the floor grinding device 100, but for the use of the floor grinding device 100 a high weight can also be desired in order to ensure sufficient contact pressure of the abrasive on the floor surface to be processed. The housing 110 can therefore also be designed to be weighed down by means of additional weights. Such weights can be removed for transporting the floor grinder 100 and only reattached shortly before the floor grinder 100 is put into operation. Forming the housing 110 from metal can also serve to prevent static charging of the dust caused by friction, which could possibly lead to a dust explosion. For this purpose it can also be provided that the suction device, to which the suctioned dust is transported, is designed with metallic components.

In the exemplary embodiment shown here, the holding plate 120 is designed to accommodate a disk-shaped abrasive. This abrasive can be attached in any way, for example by means of plug-in or Velcro connections. It can also be provided to attach more than one grinding means. These multiple abrasives are then advantageously arranged such that when rotated, they abrade the entire floor surface located beneath the support plate 120 . The grinding means can be, for example, grinding paper or diamond grinding elements.

In the embodiment described here, the manner in which the inner dust seal ring 111 and the outer dust seal ring 112 are formed is not explicitly shown. Advantageously, the inner dust sealing ring 111 and the outer dust sealing ring 112 are designed as brush rings, which can ensure a seal against dust even on uneven floors. It is also conceivable to form the inner dust sealing ring 111 and/or the outer dust sealing ring 112 in the form of a rubber ring or the like. Rubber rings are extremely robust and therefore have a long service life. They are also easy to replace.

in the in 1 shown embodiment, the recess 113 and the suction opening 114 are arranged adjacent to each other. This is particularly advantageous since the dust guided through the recess 113 is directly caught by the suction opening 114 . However, it is also conceivable to arrange the recess 113 and the suction opening 114 at a distance from one another.

2 FIG. 12 shows a schematic side view of the floor grinder 100. FIG 1 . From this view, the housing 110, the suction opening 114 and the outer dust sealing ring 112 are visible. In this exemplary embodiment, the housing 110 has a flattened disc shape.

In the exemplary embodiment shown here, the suction opening 114 has an angle of 45° to the working plane of the floor grinding device, for example. The suction opening 114 is aligned in such a way that the dust, which is also subjected to a rotational speed due to the rotation of the holding plate, is sucked off. Of course, other angles are also conceivable.

3 shows a schematic profile view of a second embodiment of a floor grinder 100. The embodiment shown here differs from that in FIG 1 shown in that two recesses 113 and two suction openings 114a, 114b are provided. Each of the two suction openings 114a, 114b is assigned to one of the recesses 113. The recesses 113 and the associated suction openings 114a, 114b are exemplary located on opposite sides of the inner section. The arrangement shown here is particularly advantageous, but other arrangements and orientations are also possible within the scope of the present invention.

In this exemplary embodiment, the dust produced during processing of the floor surface can advantageously be guided through the recesses 113 on both sides of the holding plate 120 and then sucked off directly at the respective suction openings 114a, 114b. The interior can therefore be effectively covered by the suction effect of the two suction openings 114a, 114b.

4 FIG. 12 shows a schematic side view of the floor grinder 100. FIG 3 . The housing 110, the two suction openings 114a, 114b and the outer dust sealing ring 112 are visible from this view.

In this exemplary embodiment, one of the two suction openings 114a has an angle of 45° to the working plane of the floor grinding device 100. This suction opening 114a is aligned in such a way that the dust, which is also subjected to a rotational speed due to the rotation of the holding plate, is sucked off. The other suction opening 114b is oriented perpendicularly to the working plane of the floor grinding device 100 . This orientation provides an advantageous compromise between maximizing dust extraction and directing a hose attached to extraction port 114b in a direction toward an extraction device.

figure 5 shows a schematic oblique view of a floor grinder 100 according to a third embodiment. In this view, the housing 110, two suction openings 114 and the outer dust sealing ring 112 are visible. On top of the housing 110 there is a drive device 130 which with the not visible retaining plate 120 is connected. Two rollers 140 are also attached to the housing.

The drive device 130 shown here is designed in the form of an electric motor with an integrated rechargeable battery. The battery is in figure 5 not visible. This configuration is particularly advantageous since an electric motor represents a particularly user-friendly configuration, since an electric motor operates with comparatively little noise and produces no exhaust gases. It is also conceivable to provide a cable connection in addition to or as an alternative to the battery in order to operate the motor via the electrical power supply. This avoids having to stop work to replace or charge the battery. It is also conceivable to provide an internal combustion engine as the drive device.

In the third exemplary embodiment, the rollers 140 are arranged on the side of the floor grinding device 100 facing the user and are offset relative to the working plane of the floor grinding device 100 . In use, the floor grinder 100 is tilted forward and the abrasive, the inner dust seal ring 111 and the outer dust seal ring 112 rest on the floor surface to be machined. Before and after use, the floor grinder can be tilted backwards so that only the rollers 140 touch the floor, and the floor grinder 100 can be carried easily.

To facilitate transport, as in figure 5 1, a third roller may be provided at the front of the floor grinder 100. This third role is pivoted and height-adjustable. For the operation of the application, the third roller can be fixed upwards, which enables the application-relevant components of the floor grinding device 100 to be placed on the floor. Alternatively the third roller can also be adjusted during operation in such a way that, together with the two rear rollers, it absorbs part of the weight of the floor grinder. In this way, a uniform abrasion effect can be ensured over the treated floor area. For transport, the third roller can be fixed further down in such a way that only the two rear rollers 140 and the third roller touch the floor. There is no need to tilt the floor grinder 100 and the third roller increases the steerability of the floor grinder 100 due to its pivotability.

The floor grinder 100 shown here also has a handle for guiding the floor grinder 100. Control elements for operating the drive device 130 are also attached to this handle.

In the exemplary embodiment shown here, the two suction openings 114 are connected to an external suction device (not shown) via a forked hose. It is also conceivable that a suction device is provided directly on the floor grinding device 100 . In this case, it would be advantageous to connect each of the two suction openings 114 to such an internal suction device via a separate hose.

Reference List

100

floor grinder

110

Housing

111

Inner dust seal ring

112

Outer dust seal ring

113

recess

114

suction port

114a

suction port

114b

suction port

120

Retaining plate

130

drive device

140

role

Claims (15)

1. Floor sander (100), comprising

   a housing (110) having an internal space which is open to one side;

   a holding plate (120), mounted rotatable in the internal space, for receiving an abradant; and

   a drive device (130) formed to set the holding plate (120) in rotation;

   the housing (110) having:

   an inner dust sealing ring (111) having at least one recess (113);

   at least one suction opening (114) arranged in the outer portion; and

   an outer dust sealing ring (112) which encloses the internal space;

   the internal dust sealing ring (111) subdividing the internal space into an inner portion and an outer portion;

   the holding plate (120) being arranged in the inner portion;

   characterised in that

   the inner dust sealing ring (111) and outer dust sealing ring (112) are arranged so as to define a shared working plane parallel to the plane of rotation of the holding plate (120) in such a way that during operation of the floor sander (100) both the abradant fixed to the holding plate (120) and the inner dust sealing ring (111) and outer dust sealing ring (112) are positioned against the surface to be machined.
2. Floor sander (100) according to claim 1, further comprising a suction device operatively connected to the at least one suction opening (114).
3. Floor sander (100) according to claim 2, wherein a plurality of suction openings (114) are provided, each suction opening (114) being connected to the suction device via a separate tube.
4. Floor sander (100) according to any of the preceding claims, wherein the housing (110) has a level disc shape.
5. Floor sander (100) according to any of the preceding claims, wherein the holding plate (120) is mounted movable in a direction parallel to the axis of rotation.
6. Floor sander (100) according to any of the preceding claims, wherein the holding plate (120) is formed to receive a plurality of abradants in an annular arrangement.
7. Floor sander (100) according to any of the preceding claims, wherein the drive device (130) is in the form of an electric motor.
8. Floor sander (100) according to claim 7, further comprising a battery connected to the drive device (130).
9. Floor sander (100) according to any of the preceding claims, wherein the sander (100) has the same number of recesses (113) and suction openings (114).
10. Floor sander (100) according to claim 9, wherein each suction opening (114) is assigned to a recess (113).
11. Floor sander (100) according to claim 10, wherein the inner dust sealing ring has two recesses (113) and the housing has two suction openings (114), and wherein the recesses (113) and the suction openings (114) assigned thereto are arranged on opposite sides of the inner portion in each case.
12. Floor sander (100) according to any of the preceding claims, wherein the inner dust sealing ring (111) and outer dust sealing ring (112) have brushes.
13. Floor sander (100) according to any of the preceding claims, wherein the at least one recess (113) is formed as a clearance in the inner dust sealing ring.
14. Floor sander (100) according to any of the preceding claims, wherein at least one of the suction openings (114a) is open towards the internal space at an angle of 45° to the working plane.
15. Floor sander (100) according to any of the preceding claims, further comprising at least two rollers (140) arranged offset from the working plane.

Images