EP0619979B1 - Floor treating machine - Google Patents

Abstract

A floor treating machine, in particular a floor grinder (1), has on its underside at least one working plate (9) which rotates in operation. The working plate (9) is connected in a rotationally fixed manner to a retaining part (14) which is arranged coaxially above it, is supported with at least part of the machine weight on the working plate (9) and is driven by the machine motor (7). The retaining part (14) is supported on the working plate (9) in the region of the centre of rotation, the working plate (9) being pivotable in the manner of a ball joint in accordance with possible unevennesses of the floor (2). Furthermore, the working plate (9) is located radially outside the supporting point (19) opposite the retaining part (14) at a distance permitting the pivoting of the working plate (9) and is fixed in suspended fashion to the retaining part (14) at a plurality of fixing points (21) distributed around the central supporting point (19), each having axial movement play. <IMAGE>

Description

The invention relates to a tillage machine for surface treatment of floors, in particular a floor grinding machine, with at least one processing plate on the underside of the machine, which is arranged coaxially to a holding part that can be driven by a motor to make a rotational movement, the holding part being located at a central support point under a swivel bearing of the processing plate that resembles a ball joint supports at least part of the machine weight via a support surface on the holding part side and a support surface on the processing plate side on the processing plate and the processing plate is located radially outside the supporting point opposite the holding part and is attached to the holding part in a rotationally fixed manner at several fixing points distributed around the supporting point with axial movement play.

Such a machine can be used for grinding and brushing floors, in particular wooden floors such as parquet floors, for removing any parts adhering to the floor, for example Use carpet and adhesive residues, for polishing floors, etc. Such machines regularly have a chassis so that they can be moved across the floor by pushing or pulling. In this case, the processing plate and the running wheels are coordinated with one another in terms of their height so that the processing means attached to the underside of the plate rests on the floor and is thereby loaded by the machine weight, insofar as this is not absorbed by the chassis.

When using conventional tillage machines without a ball joint-like pivot bearing of the processing plate, the working experience leaves something to be desired in the case of uneven floors in which a corrugation is contained. If a processing plate reaches a recess in the floor, it drives over it and, depending on the extent of the recess, leaves it more or less unprocessed. On the other hand, if he gets to a soil survey, there is a risk that the rim of the plate will cut into the surface of the soil.

In contrast, from DE-GM 17 05 039 or DE-GM 17 79 514 a tillage machine according to the preamble of claim 1 is known, in which a ball joint-like pivot bearing is present between the holding part and the processing plate, so that the processing plate automatically on uneven ground can adapt and assume a position inclined according to the local soil shape.

In the case of DE-GM 17 05 039, the two support surfaces have a spherical shape that fits into one another. In the machine according to DE-GM 17 79 514, a rolling edge arranged on the holding part rests on the edge of an opening of the processing plate. In both cases, when the processing plate is pivoted, the two support surfaces slide against one another, so that frictional forces occur. These frictional forces are not defined and can be greatly increased by dust deposits. If the machine stops for a while, there is even a risk that the two support surfaces will cake, so to speak.

AU-A-4 611 685 and BE-A-334 454, for example, belong to the further away state of the art there are extensively distributed pins which protrude through the elastic intermediate layer in the recesses of the machining plate and form a rotary drive for the machining plate. In the second-mentioned case, processing blocks distributed in the circumferential direction and resiliently mounted in the axial direction are arranged on the processing plate, which sit on the floor and carry out the tillage.

The present invention has for its object to provide a tillage machine of the type mentioned, which delivers a satisfactory work result even on undulating floors and in which the worker uneven floors follows smoothly.

This object is achieved in that one of the support surfaces is flat and the other of the support surfaces is spherical, one of the support surfaces being formed by a molded body made of rubber-like elastic material.

In the case of the machine according to the invention, the processing plate in question automatically adapts to this in the event of an unevenness in the ground and assumes a position which is inclined in accordance with the local shape of the ground, so that it can follow the wave shape of the ground. The pivoting is not opposed by any force originating from the machine weight, since the machine weight is practically only transferred to the processing plate at the support point and the hanging attachment of the processing plate only has to secure it against falling away from the machine. If the processing plate is at an angle, it can move, so to speak, unloaded at the fastening points where the pivoting movement is noticeable due to the axially movable bearing. This results in an unimpeded and thus practically immediate adjustment of the processing plate to the local ground slope.

Above all, when the processing plate is pivoted, a rolling movement takes place, this rolling movement being possible in all directions, so that a pivotability similar to a ball joint is achieved without the occurrence of a frictional force.

Fig. 1

eine erfindungsgemäß ausgestattete Bodenschleifmaschine in Seitenansicht mit strichpunktiert angedeutetem Umriß, wobei der in Zusammenhang mit der Erfindung interessierende Bereich im durch einen der Bearbeitungsteller gelegten Vertikalschnitt erscheint,

Fig. 2

das von einer Riemenscheibe gebildete Halteteil der Maschine gemäß Fig. 1 im der Fig. 1 entsprechenden Schnitt in Einzeldarstellung,

Fig. 3

den Bearbeitungsteller der Maschine gemäß der Fig. 1, ebenfalls im der Fig. 1 entsprechenden Schnitt in Einzeldarstellung,

Figur 4

das Halteteil in Einzeldarstellung in Ansicht von unten gemaß Pfeil IV in Figur 2 und

Figur 5

den Bearbeitungsteller in Einzeldarstellung in Ansicht von oben gemäß Pfeil V in Figur 3.

An embodiment of the invention and appropriate configurations are now explained in detail with reference to the drawing. Show it:

Fig. 1

3 shows a floor grinding machine equipped according to the invention in a side view with a dash-dotted outline, the area of interest in connection with the invention appearing in a vertical section through one of the processing plates,

Fig. 2

1 in the section corresponding to FIG. 1 in a single representation, formed by a pulley holding part of the machine,

Fig. 3

the processing plate of the machine according to FIG. 1, also in the section corresponding to FIG. 1 in individual representation,

Figure 4

the holding part in an individual representation in a view from below according to arrow IV in Figure 2 and

Figure 5

the processing plate in individual representation in a view from above according to arrow V in Figure 3.

The soil cultivation machine shown in the drawing in the form of a floor grinding machine 1 is used for the surface treatment of floors 2. The floor 2 is in particular a wooden floor and, above all, a parquet floor, the surface of which is to be ground off. Depending on the machining means of the machine attacking the floor, it can also be a brushing, polishing or the like instead of grinding. Act editing process.

The machine 1 has a machine housing 3, which sits on a chassis 4 with wheels 5, with a handle 6 standing up from the chassis 4, which can be gripped by the operator, so that the machine 1 can be moved or pushed by means of the wheels 5 can move over the floor 2.

The machine 1 also contains a motor 7 carried by the machine housing 3, in the exemplary embodiment an electric motor that drives a drive shaft 8 running downward from the motor.

On the underside of the machine there are three processing plates 9 arranged in a triangle to one another, one of which is shown in section, while one of the other two processing plates 9 is visible in a side view. When looking at FIG. 1, the third processing plate is located above the drawing plane in a position coinciding with the last-mentioned processing plate 9. The entirety of the processing plates is enclosed by an annular housing extension 10, which ends somewhat above the floor 2 and can carry a sealing lip 11 which projects downwards and lies against the floor 2 and which is intended to prevent the dust generated by the processing plates from escaping to the outside. The processing means 12 already mentioned is attached to the underside of the processing plate 9, in the exemplary embodiment a grinding means via which the respective processing plate 9 acts on the base 2.

The height of the running wheels 5 and that of the processing plate 9 are coordinated with one another in such a way that the processing plate 9 is pressed against the floor 2 by the machine weight, insofar as this is not taken up by the running wheels 5.

When the motor 7 is switched on, each processing plate 9 rotates about itself, ie about its axis of rotation 13, and thereby carries out the surface processing. Each processing plate 9 is rotatably connected to a holding part 14 arranged coaxially above it, which is driven by the machine motor 7 and transmits the machine weight to the respective processing plate 9 during operation. The holding part 14 is circular in accordance with its purpose and rotatably mounted on a housing-fixed bearing pin 15. The drive of the holding parts 14 - corresponding to the number of processing plates 9, the machine has three such holding parts 14 - is carried out by means of a toothed belt 16 or another suitable belt, which with the drive shaft 8 and in the exemplary embodiment is in driving connection with a pinion 17 seated thereon. Accordingly, the holding parts 14 are a pulley. In principle, however, the holding parts 14 could also be driven differently.

At this point it should also be pointed out that the machine 1 can in principle also have more or less than three processing plates 9, each with an associated holding part 14. In the case of a single processing plate 9, the holding part could sit directly on the drive shaft.

The cold parts 14 formed by pulleys or their bearing journals 15 are all seated on a common component 18 which is rotatably mounted on the housing 3 coaxially with the drive shaft 8.

The respective holding part 14 is supported on the processing plate 9 at a support point 19 in the region of the center of rotation (axis of rotation line 13 of the processing plate 9 and axis of rotation line 20 of the holding part 14). The arrangement is such that the processing plate 9 can be pivoted like a ball joint, so that it can be inclined in all directions. In the pivoted state, the axis of rotation line 13 of the processing actuator 9 is somewhat inclined to the axis of rotation line 20 of the holding part 14 which remains unchanged, the axis of rotation line 13 being able to be oriented as desired within a conical surface area predetermined by the maximum possible angle of rotation. The machining plate 9 and the holding part 14 with the pivoting of the machining plate lie radially outside the support point 19 9 allowable distance, as can be seen from Figure 1.

In Figure 1 it is a continuously flat floor 2. In practice, however, the floors to be worked are often uneven like waves. If the processing plates 9 were arranged rigidly, irregularities in the processing would result with such an uneven floor. In the case of a floor sink, the processing plate in question would either drive over it freely or with reduced system pressure. In the case of a soil survey, the edge of the plate could cut into the surface of the soil. The aforementioned pivotable arrangement of the processing plates 9 provides a remedy here, since the processing plates can adapt to the unevenness that occurs, so that a more uniform surface quality is achieved.

At the support point 19, the holding part 14 simply lies on the processing plate 9 without any other connection, so that the processing plate 9 would be dropped from the ground when it was lifted up, no further measures would be provided. These consist in the fact that the respective processing plate 9 is fastened to the holding part 14 at several, expediently at three fastening points 21 distributed around the central supporting point 19, namely hanging with axial movement play at each fastening point 21. This axial movement play ensures that at the Fastening points 21 no vertical forces are transmitted to the machining plate 9 even when the machining plate 9 is pivoted, unless the machining plate 9 or the fastening means strike the holding part at the end of the pivoting path.

Specifically, in the exemplary embodiment, the respective machining plate 9 is connected in a rotationally fixed manner to the holding part 14 at the fastening points 21, which are evenly distributed along a circular line, and fastened to the holding part 14 in a rotationally fixed manner, the holding bolt 22 being fixed on the one hand on the holding part 14 and on the other hand on the machining plate 9 and is connected to the holding part 14 with axial play. In contrast to the exemplary embodiment, the axial movement play could also be provided on the processing plate 9 or both on the holding part 14 and on the processing plate 9.

The retaining bolts 22 - corresponding to the number of fastening points 21, there are three retaining bolts 22 - have a tapered bolt portion 25 to maintain the axial play, which is delimited at both ends by a stop surface 23, 24 of the retaining bolt which is effective in the axial direction, which is formed by an annular surface in the embodiment. The tapered pin portion 25 passes through a bearing bore 26 of a bearing body 27 seated on the holding part 14 in the exemplary embodiment, made of rubber-like elastic material, the region of the bearing body 27 containing the bearing bore 26 being shorter in the axial direction than the tapered portion 25 of the respective retaining bolt 22, so that a there is axial movement play with a length corresponding to the difference between the length of the tapered bolt section 25 and the thickness of the bearing body 27. This difference length corresponds to the movement gap shown in FIG. 1 between the bearing body 27 and the lower stop surface 24 (see FIG. 3) 28. In this context, it is pointed out that in FIG. 1 the tillage machine 1 is drawn in a position lifted from the floor 2 by a small amount, so that the processing plate 9 hangs on the holding part 14 by means of the upper stop surface 23 of the holding bolts 22 and the movement gap 28 thus occurs below the respective bearing body 27. In the drained state, when the processing plates 9 are seated on the floor 2, there is a movement gap on both sides of the bearing body 27, which is correspondingly smaller with respect to the gap 28 shown. The extent to which the respective retaining pin 22 can be moved in the associated bearing body 27 in the axial direction can be relatively small, since the bumps that occur in practice require only a relatively small pivotability of the processing plate 9.

When pivoting the respective processing plate 9, the retaining bolts 22 are inclined in the same way as the axis of rotation line 13. At this inclination, the bearing body 27 give way because they are made of resilient material.

The bearing body 27 simultaneously form elastic stops for the retaining bolts 22 when the maximum pivoting angle is reached.

The bearing bodies 27 expediently have a frustoconical shape and are each inserted into a corresponding frustoconical holding recess 29 in the holding part 14, the frustoconical shape tapering outwards. In this way, the bearing bodies 27 are positively secured against falling out. During assembly, the bearing body 27 pressed into the associated holding recesses 29 with elastic deformation.

In the exemplary embodiment, the retaining bolts 22 have a threaded portion 30 screwed into the machining plate 9 at their end opposite the tapered bolt portion 25. Furthermore, the retaining bolts 22 between the tapered bolt portion 25 and the threaded portion 30 have a polygonal portion 31 arranged in the distance between the holding part 14 and the processing plate 9 for attaching a turning tool in the form of a wrench or the like, so that the retaining bolt in question is tightened or loosened on the processing plate 9 can be.

The polygonal portion 31 forms with its front side facing the tapered bolt portion 25 the lower stop surface 24. The opposite stop surface 23 is formed by a conical bolt head 32 which can be easily inserted through the relevant bearing bore 26 during assembly.

With regard to the suspension of the processing plate 9, the arrangement could in principle also be reversed so that the bearing bodies 27 on the processing plate 9 and the threaded holes 30 receiving the threaded portions would sit on the holding part 14 and the holding bolts 22 would be reversed. The variant shown is useful in various respects.

At the central support point 19, the holding part 14 and the processing plate 9 each have a support surface 33 or 34, between which when the processing plate is pivoted a rolling movement takes place. Due to the rotational symmetry of the support surfaces 33, 34, this rolling movement is possible in all directions, so that in this way a ball joint-like pivotability is achieved without the occurrence of a frictional force. This is advantageous for the smooth movement of the swivel movement.

One of the support surfaces, the support surface 34, can be formed by the spherically shaped upper side 35 of a support projection 35 arranged on the processing plate 9 and protruding toward the holding part 14. The support projection is expediently integrally formed on the processing plate 9.

In the exemplary embodiment, however, the other support surface 33 is flat. However, the arrangement could also be reversed in this regard, i.e. the spherical support surface could be on the holding part and the flat support surface on the processing plate.

Another expedient measure is that the holding part 14 is supported on the processing plate 9 in an elastically flexible manner. This can be achieved very simply by the fact that at least one of the support surfaces 33, 34, in the exemplary embodiment the support surface 33, is formed by a molded body 37 made of rubber-like elastic material. This molded body is advantageously arranged on the holding part 14, but it could also sit on the processing plate in the case of reversed conditions.

The molded body 37 can be knotted into the part carrying it, it expediently having a frustoconical shape and being inserted into a corresponding frustoconical holding recess 38 of the part carrying it, the frustoconical shape tapering outward. In this respect, the same conditions as for the bearing bodies 27 can therefore exist.

Claims (9)

1. Floor finishing machine for the surface treatment of floors, in particular floor grinding machine, with at least one machining disc located at the bottom of the machine coaxial with a holding part in which a rotary movement can be induced by a motor, the holding part being supported at a central support point with at least part of the machine weight on the machining disc via a support surface on the holding part and a support surface on the machining disc with a swivelling, ball joint-type support of the machining disc and the machining disc being located opposite the holding part at a distance therefrom radially outside the support point and suspended with axial play but non-rotatably from the holding part at several mounting points distributed around the support point, characterized in that one (33) of the support surfaces (33, 34) is flat while the other (34) of the support surfaces (33, 34) is crowned, one (33) of the support surfaces (33, 34) being a moulded body made of a rubber-like resilient material.
2. Floor finishing machine according to Claim 1, characterized in that the crowned support surface (34) is located on the machining disc (9) and the flat support surface (33) is located on the holding part (14).
3. Floor finishing machine according to Claim 1 or 2, characterized in that the resilient moulded body (37) is located on the holding part (14).
4. Floor finishing machine according to any of Claims 1 to 3, characterized in that the resilient moulded body (37) is tied into the part (14) which carries it.
5. Floor finishing machine according to any of Claims 1 to 4, characterized in that the moulded body (37) has the shape of a truncated cone and is installed in a corresponding truncated cone shaped mounting recess (38) of the part (14) which carries it, the truncated cone shape tapering towards the outside.
6. Floor finishing machine according to any of Claims 1 to 5, wherein each mounting point is provided with a retaining bolt projecting from one of the parts for the non-rotatable suspension of the machining disc from the holding part, said retaining bolt having a narrowed section passing through a bearing bore in the other part between two axially acting stop surfaces, the bearing bore being shorter than the narrowed bolt section and having a smaller diameter than the stop surfaces, characterized in that the bearing bore (26) is formed in a bearing body (27) made of a rubber-like resilient material and mounted on the other part (holding part 14).
7. Floor finishing machine according to Claim 6, characterized in that the bearing body (27) is located on the holding part (14).
8. Floor finishing machine according to Claim 6 or 7, characterized in that the bearing body (27) has the shape of a truncated cone and is installed in a corresponding truncated cone shaped mounting recess (29) of the holding part (14) or the machining disc respectively, the truncated cone shape tapering towards the outside.
9. Floor finishing machine according to any of Claims 6 to 8, characterized in that the retaining bolts (22) have a threaded section (30) screwed into the machining disc (9) or the holding part respectively at the end opposite the narrowed section (25) and a polygonal section (31) for the application of a tightening tool located in the space between the holding part (14) and the machining disc (9) between the narrowed section (25) and the threaded section (30).

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