WO2016150485A1

WO2016150485A1 - Ground-cleaning machine and method for operating a ground-cleaning machine

Info

Publication number: WO2016150485A1
Application number: PCT/EP2015/056232
Authority: WO
Inventors: Marcus Haug; Bernd Haberl; Oliver VIETH; Janos PALFI
Original assignee: Alfred Kärcher Gmbh & Co. Kg
Priority date: 2015-03-24
Filing date: 2015-03-24
Publication date: 2016-09-29
Also published as: CN107567516B; CN107567516A; EP3274510B1; EP3274510A1; DK3274510T3

Abstract

A ground-cleaning machine is proposed which comprises a chassis, a tool device with one tool receptacle (40) and with a ground-working tool (44) seated on the one tool receptacle (40), and a holding device which holds the one tool receptacle (40) on the chassis, wherein the holding device comprises a polygonal linkage with a first transverse strut (66) fixed relative to the chassis, with a second transverse strut (68) relative to which the one tool receptacle (40) is fixed, with a first longitudinal strut (72) which is pivotably articulated to the first and the second transverse struts (66, 68) via pivot joints, and with a second longitudinal strut (74) which is pivotably articulated to the first and the second transverse struts (66, 68) via pivot joints, wherein a spring device (92) is integrated in at least one strut (74) of the polygonal linkage, by means of which spring device a length of the corresponding strut (74) between pivot axes for the one strut (74) is variable in dependence on a force acting on the polygonal linkage.

Description

Floor cleaning machine and method for operating a

The invention relates to a floor cleaning machine, comprising a chassis, at least one tool device with at least one tool holder and with a tillage tool sitting on the at least one tool holder, and a holding device which holds the at least one tool holder on the chassis, wherein the holding device is a polygonal link comprising a first transverse strut, which is fixed relative to the chassis, with a second transverse strut, relative to which the at least one tool holder is fixed, with a first longitudinal strut, which is pivotally connected via a first pivot about a first pivot axis to the first cross strut and which is articulated via a second pivot about a second pivot axis pivotally mounted on the second transverse strut, and with a second longitudinal strut, which pivotable about a third pivot about a third pivot axis to the first Qu erstrebe is articulated and is pivotally connected to a fourth pivot about a fourth pivot axis hinged to the second cross member.

Such a floor cleaning machine is designed for example as a sweeper or as a floor cleaning machine with sweeping. From WO 2012/171579 AI a sweeper with a disc brush for sweeping dirt from a floor surface to be cleaned is known, the disc brush has a relative to the horizontal inclined brush plate with brushes held on it and is rotatable about a rotation axis. There is an adjusting element of an adjusting device provided for changing the inclination of the brush plate relative to the horizontal and for changing the contact area of the brush with the bottom surface. Furthermore, a holding device for holding the disc brush on the sweeper is provided. The holding device comprises a joint members connected to each other at joints constructed joint polygon with a first joint member, via which the joint polygon is held on the sweeper, and with a second joint member on which the disc brush is held. The adjusting element is variable in length and connected to at least one hinge member, wherein depending on a change in the length of the adjusting element, the orientation of the first hinge member relative to the second hinge member changeable and the plate brush is pivotable about a pivot axis aligned to the pivot axis. From EP 0 021 784 a device for mounting a rotating brush is known.

From US 4,368,554 a street sweeping device is known. The invention has for its object to provide a floor cleaning machine of the type mentioned, which has additional functionalities with a simple structural design.

This object is achieved with the above-mentioned floor cleaning machine according to the invention that in at least one strut of Polygonallenkers a spring device is integrated, by means of which a length of the corresponding strut between the pivot axis and the at least one strut in response to a force acting on the polygonal link force is variable.

By integrating the spring device in at least one strut (in the first longitudinal strut and / or the second longitudinal strut and / or the first cross member and / or the second cross member) can be changed with a corresponding external application of force, the shape of a polygon of the polygonallenkers.

This change in shape causes a relative change in position of the tool holder relative to the chassis or to a floor on which the floor cleaning machine is placed. This flexibility can be used to actively increase, for example, a Rampengängigkeit the floor cleaning machine or to allow for abutment of a tillage tool to an obstacle automatic evasive movement.

This results in additional movement options on the holding device and thus for a tillage tool. For these additional mobilities, however, no additional active Versteilantrieb must be provided, but on the action of appropriate forces mobility can be achieved.

This results in a simple design, increased functionality in particular with respect to ramp accuracy and in one

Working position regarding avoidance of obstacles.

The tilling tool is in particular a cleaning tool such as a sweeping tool or a scrubbing tool. For example, it is also possible for the soil tillage implement to be a mowing deck, a snow blade, a balance beam, and so on.

The floor cleaning machine is designed, for example, as a sweeper and in particular municipal sweeper with additional cleaning options for a cleaning function. In one embodiment, it is provided that the first transverse strut is formed fixed in length and / or the second transverse strut is formed fixed in length. This results in a simple structural design.

By appropriate design of the spring device, wherein the spring device in particular has a minimum hardness, it can be achieved that for the normal cleaning operation and for a "normal" transport operation, the at least one strut can be regarded as rigid with the spring device. In one embodiment, it is provided that the first transverse strut is formed fixed in length and / or the second transverse strut is formed fixed in length. This results in a simple structural design.

It is advantageous if the spring device and the first longitudinal strut and / or the second longitudinal strut is integrated. This results in advantageous additional functionalities. It is particularly advantageous if the spring device is arranged and formed on the polygonal link such that the shape of a polygon formed between the pivot axes is variable due to a change in length of the at least one strut by the spring device, wherein in particular a change in shape of the polygon a change in position of at least causes a tool holder relative to the chassis. As a result, for example, a tilt-transport position can be actively set to increase a Rampengängigkeit, but no additional active (tilt) adjustment must be provided. Further, in a working position of a soil tillage implement, dodging of the tilling tool upon impact with an obstacle can be achieved with automatic recovery when the obstacle is no longer present. Dodging, in turn, is achieved in an automatic manner without, for example, having to provide a corresponding control or regulation.

It is particularly advantageous if the spring device is arranged and designed on the polygonal link such that an effective sufficiently large force on the polygonal link causes relative pivoting of the at least one tool holder to the chassis or a floor on which the floor cleaning machine is installed. As a result, the passive spring device can be used to actively a

To reach tilting transport position, and thereby increase the Rampengängigkeit the floor cleaning machine. Furthermore, the spring device be used to automatically allow for a cleaning tool to evade when the soil tillage tool to a

Obstruction (outside of a normal cleaning operation). It is particularly advantageous if the spring device has such a minimum hardness that the forces occurring in a normal tillage process cause no relevant change in position of the at least one tool holder to the chassis. In a normal tillage operation, the polygonal link can then be viewed as a handlebar with rigid sides. If excessive force loads occur, such as when the tillage tool is impacted against an obstacle, then the spring means may become effective in their resilient properties to permit evasion and subsequent recovery. Furthermore, for example via the polygonal articulation a transport position can be set, in which, for example, an envelope plane of the tilling tool is at least approximately parallel to a floor. For example, if an increased Rampen- popularity is required because the floor cleaning machine ascends to a ramp, then a tilt-transport position can be actively achieved via appropriate action on the spring device. For this purpose, however, no additional active (tilt) drive is necessary; It suffices an adjusting device for a height adjustment of the soil working tool relative to the chassis. In particular, the spring device has a spring rate, which

at least 10 N / mm and advantageously at least 20 N / mm and in particular at least 30 N / mm and in particular at least 40 N / mm and in particular at least 50 N / mm and in particular at least 55 N / mm. The corresponding strut with the spring device can then be considered as "rigid" for "normal operation". Only when special conditions are present, in particular abutment against an obstacle of a cleaning tool, or stop a portion of the strut to a stop, the Spring device become effective with a corresponding change in length of the strut.

The polygonal link is designed, in particular, as a trapezoidal link or parallelogram link, depending on the application.

It is particularly advantageous if the at least one strut has a first region with the spring device, which is fixed in length and which is arranged on a pivot joint, has a second region which is fixed in length and which is arranged on a further pivot joint, and has at least one spring which is fixed to the first region and the second region and is positioned between the first region and the second region. This makes it possible in a simple way to achieve a length variability of the strut with the spring device. This change in length is fundamentally force-controlled as a function of a force component which acts along a spring force direction of the at least one spring.

In one embodiment, the spring means is integrated into the second longitudinal strut and the first longitudinal strut is formed fixed in length, wherein the first longitudinal strut is arranged with respect to the direction of gravity above the second longitudinal strut, when the floor cleaning machine rests on a floor, and / or to the first Longitudinal strut engages an adjusting device for adjusting a height position of the tool holder relative to the ground. It can thereby achieve a compact design. It can be realized in a simple manner a height adjustment of the tool holder on the holding device and it can be a length variability obtained on the polygon link. It is advantageous if the spring device has a basic position, by which an initial length of the at least one strut is defined with the spring device, and that a spring force of the spring device endeavors to bring the spring device into the basic position. For a normal Operation of the floor cleaning machine, the spring device is in the normal position. In a "normal" operation, a tilling operation such as a cleaning operation or a tilling tool (such as a cleaning tool) is in a transport position. By guiding the spring device out of the basic position, additional functionalities can be achieved, such as, for example, an increased ramp accuracy or avoidance with regard to the abutment of a soil cultivation tool on obstacles. It is advantageous if the length of the at least one strut with the

Spring device in dependence on the force acting against the initial length can be reduced or increased. This can be done

implement (at least) two additional functionalities; It is possible to actively set a tilting transport position without having to provide an additional active drive. It can be passively realized when abutting a tillage tool to an obstacle dodging the tillage tool.

In particular, with a reduction in relation to the initial length, a relative tilting of the at least one tool receptacle is effected, in which a distance to a bottom of an end of a soil cultivation tool facing the first crosspiece increases. For example, in a working position of a tillage tool in a cleaning process, the tilling tool abuts an obstacle, wherein an abutment surface is oriented transversely to a floor to be cleaned, then a corresponding force is exerted on the tillage tool. This force is transmitted to the polygonal link. If a corresponding force is sufficiently large, then it can cause compression of the spring means. This compression on the spring device in turn leads to a deviation of the tool holder with the soil working tool from the obstacle. As a result, a force load of the tool device of the holding device is reduced and the risk of damage is reduced. At a magnification relative to the initial length, in particular, a relative tilting of the at least one tool holder is effected, in which a distance to a bottom of an end of a soil cultivation tool facing away from the first transverse strut increases. The end of the tilling tool facing away from the first cross member is a front end.

Its distance from the ground is increased. This results in an increased Rampengängigkeit the floor cleaning machine. This relative tilting is actively achieved by, in particular, bringing a region of the at least one strut with the spring device against a stop. But for this active tilting no additional active drive to the anyway existing adjusting device for the height adjustment is necessary.

Conveniently, an adjusting device is provided, which is associated with the holding device, by which a height distance of the at least one tool holder to a floor on which the floor cleaning machine stands up, is detectably adjustable. In particular, a tilling tool between a working position (such as a cleaning position) and a transport position can be moved by the adjusting device and corresponding positions can be defined.

Conveniently, one or more working positions of the at least one tool device are provided, in which one or more soil working tools act on the soil to be worked (for example, to be cleaned), and there are one or more transport positions in which the soil tillage implement (s) are spaced from the ground. In one embodiment, the adjusting device comprises at least one driven length-adjustable member (such as a pneumatic cylinder or hydraulic cylinder), which is articulated with a first pivot point to the first longitudinal strut or the second longitudinal strut and articulated with a second pivot point to the first cross member or to the chassis , wherein by the length-adjustable member a

Distance between the first articulation point and the second articulation point is detectably adjustable. It can thus be easily active one Driving the pivoting movement of the first longitudinal strut or the second longitudinal strut, wherein a set pivot position can be determined easily. This makes it easy to adjust the height distance of the tool holder and thus a tillage tool to the chassis or to a floor to be cleaned.

It is particularly advantageous if the spring device is arranged and formed on the polygonal link so that a length of the at least one strut with the spring device decreases when force is applied to the at least one soil working tool with a sufficiently large force component along a spring force action direction. As a result, it is possible automatically, if there are correspondingly large force loads, a deflection of the tillage tool reach to reduce the power load. For this Dodge no additional active drive must be provided and there is no control or regulation must be provided.

It is particularly advantageous if the at least one strut is associated with the spring device a stop which is effective at a defined height position of the holding device relative to the chassis and in particular in a transport position of the at least one tool holder. About the stop can act on the at least one strut with the spring means in a certain position so that a change in length of the at least one strut is effected and in particular an increase in length is effected.

Conveniently, the stop is designed such that it blocks a mobility of a region of the at least one strut with the spring device when the region abuts against the stop and then the at least one strut is extendable via the spring device. If the corresponding region of the at least one strut rests against the abutment with the spring device, then, as the polygonal linker continues to move, this can Area can not be moved. It becomes a constraint in the

System introduced the polygonallenkers. The spring device then allows a "dodging" with respect to this constraint condition, in particular by extending the at least one strut with the spring device. As a result, a tilting transport position of a soil tillage implement can be achieved in order to increase runnability. The

Tilt transport position can be achieved in an active manner by the corresponding area of the at least one strut as the spring device is brought to the stop. But there is no tilting drive or the like necessary because the setting of the tilt-transport position can be used by an existing adjusting device for a height position of the tool holder with the soil working tool.

Conveniently, the one of the at least one tool holder

Assigned rotary drive for the tillage tool, which sits in particular on the at least one tool holder. It can thereby drive a rotational movement of the tillage tool to effect an effective cleaning process and, for example, sweeping or scrubbing.

In one embodiment, the at least one tool device is designed as a cleaning tool device. The floor cleaning machine is in particular a sweeper or scrubbing machine or a floor cleaning machine with sweeping function or scrubbing function. The (at least one) cleaning tool is then a sweeping tool or

Schrubbwerkzeug. It is designed in particular self-driving. For example, it is designed as a ride-on machine.

In one embodiment, the vehicle has a front end and a rear end with respect to a forward direction of travel, and

at least one tilling tool protrudes beyond the front end and / or the rear end and / or beyond a side end. When approaching an obstacle, the soil tillage implement bumps outer end of the floor cleaning machine to the obstacle. Spring device can be an automatic evasion realize.

According to the invention, a method for operating a floor cleaning machine according to the invention is provided in which in a transport position, a distance to a bottom of the first crosspiece end remote from a tillage tool is increased by the holding device is pivoted away from the ground and the at least one strut with the spring device with a region abuts against a stop, whereby the length of the at least one strut is increased with the spring device.

The method according to the invention has the advantages already explained in connection with the floor cleaning machine according to the invention.

It can thereby actively reach a tilting transport position to increase a Rampengängigkeit the floor cleaning machine without an additional active drive for reaching the tilting transport position is necessary.

According to the invention, a method for operating a floor cleaning machine according to the invention is further provided, wherein the spring device is formed so that in a working position of a tillage tool a tilting movement of the tillage tool is effected when the tillage tool abuts an obstacle having a contact surface, the transverse to a floor on which the floor cleaning machine is placed, is oriented, wherein the at least one strut with the spring means due to the force acting on the impact shortens their length and thereby increases a distance to the bottom of the first crosspiece end facing the tilling tool increases. The method according to the invention has the advantages already explained in connection with the floor cleaning machine according to the invention.

The spring device allows, if a sufficiently large force acts, a deflection of the tillage tool from the obstacle. As a result, a force load of the tillage tool and the holding device is reduced and thereby reduces the risk of damage.

The following description of preferred embodiments is used in conjunction with the drawings for further explanation of the invention. Show it :

Figure 1 is a schematic perspective view of an embodiment of a floor cleaning machine in the form of a sweeper;

Figure 2 is a plan view of a tool device of the floor cleaning machine according to Figure 1 in a transport position (before a tilt);

FIG. 3 (a) shows a side view of the tool device according to FIG. 2; Figure 3 (b) is a sectional view taken along line 3 (b) -3 (b) of Figure 2; Figure 3 (c) is a sectional view taken along the line 3 (c) -3 (c) of Figure 2;

FIG. 4 shows a further lateral sectional view of the tool device according to FIG. 2 in the transport position; FIG. 5 shows a plan view of the tool device according to FIG. 2 in a tilted transport position; Fig. 6 (a) is a view similar to Fig. 3 (a) with a tilling tool in the tilted transport position;

Figure 6 (b) is a view similar to Figure 3 (b) with the tillage tool in the tilted transport position;

Figure 6 (c) is a view similar to Figure 3 (c) with the soil tillage implement in the dumped transport position; FIG. 7 is a side view corresponding to FIGS. 3 (a) and 6 (a),

where both the transport position and the

Tilted transport position are shown;

Figure 8 is a view similar to Figure 4, wherein the tillage tool is further pivoted;

Figure 9 is a view similar to Figure 8, wherein the tillage tool is further pivoted and a stop is reached;

Figure 10 is a plan view of the tool device according to Figure 2 in a working position;

FIG. 11 (a) shows a side view of the tool device in the working position according to FIG. 10;

Figure 11 (b) is a sectional view taken along the line l l (b) -l l (b) of Figure 10;

Fig. 11 (c) is a sectional view taken along the line I l (c) -1 (c) of Fig. 10;

Figure 12 is a plan view similar to Figure 10 to a tilting working position; Fig. 13 (a) is a view similar to Fig. 11 (a) showing the tilling tool in the dumping position;

FIG. 13 (b) shows a view similar to FIG. 11 (b) with the soil cultivation tool in the tilting working position;

Fig. 13 (c) is a view similar to Fig. 11 (c) with the soil tillage implement in the dumping position; Figure 14 is an illustration corresponding to Figures 11 (a) and 13 (a) with the soil working tool in the working position and tilting working position;

FIG. 15 schematically shows a first exemplary embodiment of a polygonal handlebar with a length-adjustable longitudinal strut;

FIG. 16 shows a further exemplary embodiment of a polygonal link having a variable-length transverse strut; and FIG. 17 is a side view of another embodiment of a

Floor cleaning machine.

An embodiment of a floor cleaning machine according to the invention, which is shown in FIG. 1 and denoted there by 10, comprises a sweeping function. The floor cleaning machine can be designed as a pure sweeper or in addition to one or more other cleaning functions have a sweeping function; For example, the floor cleaning machine is a sweeping-scrubbing machine with scrubbing and sweeping.

The floor cleaning machine 10 includes a chassis 12. On the chassis 12, a front wheel 14 and a rear wheel 16 are arranged. In one embodiment, the rear wheel device comprises 16, a right rear wheel 18 and a left rear wheel (not visible in FIG. 1). The front wheel device 14 comprises in particular a steerable front wheel 20. The floor cleaning machine 10 has in particular a travel drive and is self-propelled.

On the chassis 12, a driver's seat 22 is arranged. The floor cleaning machine 10 is then a Aufsitzmaschine. There is provided a steering wheel 24 which is operatively connected to the steerable front wheel 20.

On the chassis 12, a structure 26 is arranged, on which the corresponding components of the floor cleaning machine 10, such as a traction drive are arranged.

The chassis 12 has a front end 28 and a rear end 30. The front wheel device 14 is located at the front end 28 and the rear wheel 16 is at the rear end 30. The floor cleaning machine 10 has a forward direction of travel 32, which corresponds to the direction from the rear end 30 to the front end 28.

The chassis 12 also has side ends 34, 36. The side ends 34, 36 are opposite each other.

The floor cleaning machine 10 includes tooling means 38. In the embodiment shown in Figure 1, four tooling means are provided (three of which are visible in the illustration).

A tool device 38 has a tool holder 40. The tool holder 40 is held on the chassis 12 via a holding device 42; the holding device 42 can thereby directly on the chassis 12 be held or indirectly held on an element, which in turn is fixed to the chassis 12.

At the tool holder 40 sits as a tillage tool a cleaning tool 44 of the tool device 38th

In principle, it is also possible for a soil tillage implement other than a cleaning tool, for example a mowing tool, a snow blade, a suspension bar, etc. to be located on the tool device 38. In particular, it is provided that the floor cleaning machine 10 can be operated alternatively with a plurality of soil tillage tools (cf. also the exemplary embodiment according to FIG. 17).

At the tool holder 40, a rotary drive 46 is arranged, through which a seated on the tool holder 40 cleaning tool 44 is rotatable about a rotation axis 48.

In one embodiment, a cleaning tool 44 is formed as a sweeping tool 50. The sweeping tool 50 is designed in particular as a plate brush with a brush plate 52. Brushes 54 are held on the brush plate 52. These brushes 54 are oriented without an application of force at an obtuse angle 56 to the brush plate 52 (cf., for example, FIG. 3 (b)). The angle 46 is for example at about 135 °.

A lower end 58 of the brushes 54 lies on an envelope plane 60. Without applying force to the brushes 54, the envelope plane 60 and the brush plate 52 are oriented parallel to one another.

For a cleaning operation, the floor cleaning machine 10 with the front wheel device 14 and the rear wheel device 16 is set up on a floor 62 to be cleaned (cf., for example, FIG. 3 (b)). About the Holding device 42, the distance of a cleaning tool 44 to the bottom 62 by adjusting the distance of the tool holder 40 to the bottom 62 is adjustable. The floor cleaning machine 10 has tool devices 38 a, 38 b, which are arranged in the region of the front end 28 of the chassis 12. The respective cleaning tools 44 of these tool devices 38a, 38b protrude beyond the front end 28. They also protrude beyond the side ends 34 and 38, respectively.

When the floor cleaning machine 10 approaches an obstacle such as a wall oriented transverse to the floor 62, one or more cleaning tools 44 of the tooling devices 38a, 38b first abut that obstacle.

The holding device 42 (cf., FIGS. 2 to 16) comprises a polygonal counterbore 64. The polygonal counterbore 64 has a first transverse strut 66. The first transverse strut 66 is firmly fixed to the chassis 12 and in particular fixed directly to the chassis 12.

The polygonallenker 64 further includes a second cross member 68. This second cross member 68 is spaced from the first cross member 66th

The second transverse strut 68 is in particular parallel to the first transverse strut 66 (the polygonal link 64 is then a parallelogram link) or oriented at an acute angle to this (the polygonal link 64 is then a

Trapezoidal-link).

At the second transverse strut 68, a fixing device 70 is arranged. About this fixing device 70, the tool holder 40 is fixedly secured to the second cross member 68. It is in principle possible that an angular position of the tool holder 40 relative to the second transverse strut 68 is detectably adjustable. For example, a screw or bolt connection is provided by which such an angular position is adjustable. Such a set angular position is not variable in an operation of the floor cleaning machine 10.

Further, the polygonallenker 64 includes a first longitudinal strut 72 and a spaced second longitudinal strut 74. Relative to the direction of gravity g, when the floor cleaning machine 10 rests on the floor 62, the first longitudinal strut 72 is above the second longitudinal strut 74.

The first longitudinal strut 72 is articulated via a first pivot joint 76 to the first transverse strut 66. The first pivot joint 76 defines a first pivot axis 78 about which the first longitudinal strut 72 is pivotable relative to the first transverse strut 66. For example, in Figure 3 (a), the first pivot axis 78 is perpendicular to the plane of the drawing.

Furthermore, the first longitudinal strut 72 is articulated via a second pivot joint 80 to the second transverse strut 68. The second pivot joint 80 defines a second pivot axis 82 which is parallel to the first pivot axis 78. Around this second pivot axis 82, the second transverse strut 68 is pivotable relative to the first longitudinal strut 72. Furthermore, the second longitudinal strut 74 is articulated via a third pivot joint 84 to the first transverse strut 66. The third pivot joint 84 allows pivoting of the second longitudinal strut 74 about a third pivot axis 86. This third pivot axis 86 is parallel to the first pivot axis 78. Furthermore, the second longitudinal strut 74 of the polygonallenkers 64 is articulated via a fourth pivot joint 88 to the second cross member 68. The fourth pivot joint 88 allows pivoting of the second transverse strut 68 about a fourth pivot axis 90 on the second longitudinal strut 74. The fourth pivot axis 90 is parallel to the first pivot axis 78.

Points on the pivot axes 78, 82, 86, 90 at the same height

(For example, puncture points on the drawing plane) form the vertices of a polygon. In the embodiment shown, the polygon is a trapezoid so that the polygonal link 64 is a trapezoidal link.

The distance between the first pivot axis 78 and the third pivot axis 86, which is a distance to the first transverse strut 66, is fixed.

Further, the distance between the second pivot axis 82 and the fourth pivot axis 90, which is a distance to the second cross member 68, fixed. The distance between the first pivot axis 78 and the second pivot axis 82, which is a distance to the first longitudinal strut 72, is also fixed.

In the second longitudinal strut 74, a spring device 72 is integrated.

The second longitudinal strut 74 has a first region 94, which is articulated via the fourth pivot joint 88 to the second transverse strut 68. This first region 94 of the second longitudinal strut 74 has a fixed length. Furthermore, the second longitudinal strut 74 has a second region 96. This second region 96 is also designed to be fixed in length and is articulated via the third pivot joint 84 to the first transverse strut 68. The spring device 92 is connected to the first region 94 and to the second region 96 and lies between them.

In particular, the spring device 92 comprises a spring 98 and in particular a helical spring, which is connected to the first region 94, with is connected to the second region 96 and is thereby connected between the first region 94 and the second region 96.

By the spring device 92, which is integrated into the longitudinal strut 74, the length of the second longitudinal strut is variable, depending on the expansion or compression state of the spring device 92nd

The first transverse strut 66, the second transverse strut 68 and the first longitudinal strut 72 are fixed in length (in particular with respect to the distances between the corresponding pivot axes). As mentioned, the second longitudinal strut 74 is variable in length. The distance between the third pivot axis 86 and the fourth pivot axis 90 depends on the state of the spring device 92.

A spring force 100 of the spring device 92 acts in a direction 102 which corresponds to one side of the polygon of the polygonallenkers 64 on the second longitudinal strut 74.

In Figure 15, the ratios are shown schematically, where the polygonal link is shown there as a parallelogram link; the first longitudinal strut 72, the first transverse strut 66 and the second transverse strut 68 have a fixed length. In the second longitudinal strut 74, the spring device 92 is integrated, which is a change in length of the second longitudinal strut 74 between the third

Swivel axis 86 and the fourth pivot axis 90 allows. As will be explained in more detail below, this length variability on the second longitudinal strut 74 allows a change in the shape of the polygon of the polygonallenkenkers 64. This change in shape in turn allows a change in position of the tool holder 40, which is fixed relative to the second cross member 68. The change in shape of the polygonallenkers then controls a change in position of the tool holder 40th

The spring device 92 is relatively hard designed to provide a sufficiently stiff second longitudinal strut 74 in "normal operation". In particular, the spring rate of the spring device 92 is at least 10 N / mm and preferably at least 20 N / mm and preferably at least 30 N / mm and preferably at least 40 N / mm and in particular at least 50 N / mm and preferably at at least 55 N / mm.

In one embodiment, the spring rate is about 61 N / mm. The holding device 42 is assigned an adjusting device 104 (cf., for example, FIGS. 3 (a) and 3 (b)). The adjusting device 104 is used for a height adjustment and fixing a set height position of the holding device 42 and thus the tool holder 40 relative to the chassis 12 and to the bottom 62nd

In one embodiment, the adjustment device engages the first longitudinal strut 72. The adjusting device 104 includes for this purpose a driven length-adjustable member 106. This member 106 is articulated via a first articulation point 108 to the first longitudinal strut 72. It is articulated to the first transverse strut 66 via a second articulation point 110.

By increasing the length of the length-adjustable member 106 is driven, the first longitudinal strut 72 pivoted away from the bottom 62 upwards. As a result, the tool holder 40 is lifted by the cleaning tool 44.

By shortening the length of the member 106, the first longitudinal strut 72 is pivoted down to the bottom 62. This can be done

Lower cleaning tool 44 for a working position on the floor 62.

The detectable variable length member 106 is for example a

Pneumatic cylinder or a hydraulic cylinder. It is also possible for the adjusting device 104 to have a motor drive and in particular an electromotive drive which, for example, acts on the first longitudinal strut 72 in the region of the first pivot joint 76.

FIGS. 2, 3, 4 show the tool holder with the cleaning tool 44 in a transport position 112. In this transport position 112, the cleaning tool 44 is lifted off the base 62, so that the envelope plane 60 is completely spaced from the base 62 and, in particular, is at least approximately parallel spaced.

In a working position 114 (cf., for example, FIGS. 1 and 11 (a)) of the cleaning tool 44, brushes 54 touch the bottom 62. The envelope plane 60 is oriented at an acute angle 116 to the bottom 62. This acute angle is for example in the order of 5 to 15 °. There are basically different working positions 114 possible; For example, with brush wear, a "sinking" of the cleaning tool 44 can be performed. The polygonallenker 64 is dimensioned so that in the working position 114 the desired for a good cleaning result acute angle 116 of the cleaning tool 44 is present to the bottom 62, and in the transport position 112, which is not a working position for the cleaning tool, the cleaning tool 44 with the Einhüllendenebene 60 at least

approximately parallel to the floor 62 on which the floor cleaning machine 10 is placed oriented.

This dimensioning is achieved by a corresponding length dimensioning of the struts 66, 68, 72, 74 of the polygonallenkers 64.

The second longitudinal strut 74 is assigned a stop 118 (FIG. 4). The stop 118 is arranged, for example, on the first transverse strut 66 and fixed relative thereto. The stop 118 is not effective in the working position 114. It becomes effective only when, starting from a certain transport position 112, the first longitudinal strut 72 is actively pivoted further upwards. It is then possible to reach a tilting transport position 120 (FIGS. 5 to 10).

The second longitudinal strut 74 has assigned to its second region 96 a counter area 122 for the stop 118. The opposite region 122 is located opposite the stop 118. When driven via the adjusting device 104, the longitudinal strut 72 is pivoted away from the bottom 62 upwards, then the counter region 122 is moved in the direction of the stop 118. The stop 118 is arranged and configured in relation to the opposite region 122 so that in the working position 114 (wherein several working positions 114 may be provided) and in or shortly before the transport position with the envelope level 60 parallel to the bottom 62 and in all intermediate positions therebetween the counter area 122 does not abut stop 118.

FIG. 8 shows such an intermediate position.

As a result of further upward pivoting of the first longitudinal strut 72, the counterpart area 122 comes into contact with the abutment 118 (compare FIG. 9). In particular, the stopper 118 is arranged and configured in relation to the counterpart portion 122 such that this striking is achieved just when the transporting position 112 is reached with parallel alignment

(At least approximately) of the cleaning tool 44 with respect to its Einhüllendenebene 60 to the bottom 12. If starting from this position, the second longitudinal strut 74 relative to the first cross member 66 (which is set by a corresponding position of the first longitudinal strut 72 to the first cross member 66) first longitudinal strut 72 further upwards is pivoted, then the second portion 96 of the second longitudinal strut 74 bears against the stop 118 and can no longer follow the pivoting movement of the first longitudinal strut 72. As a result, there is a forced condition on the polygonal link 64, which causes the spring device 92 to be moved out of a basic position 124 (cf., for example, FIG. the spring 98 is stretched. This increases the length of the second longitudinal strut 74 between the third pivot axis 86 and the fourth pivot axis 90. This enlargement of the length compared to an initial length of the second longitudinal strut 74 causes a pivoting of the tool receptacle 14 with the cleaning tool 44 relative to the chassis 12 or to the bottom 62 and it is reached the tilting transport position 120. This will be explained again with reference to FIGS. 6 (a) to 6 (c).

By abutment of the counter area 122 against the stop 118 and further upward pivoting of the first longitudinal axis 72, the spring device 92 is stretched with the spring 98 in the direction 102 (see FIG. 6 (a)).

As a result, the polygon of the polygonallenkers 64 is stretched on the second longitudinal strut 74. This is shown schematically in FIG.

This in turn causes a relative pivoting of the tool holder 40 with a front end 126 of the bottom 62 away. The front end 126 lies closer to the second transverse strut 68 than to the first transverse strut 66. This front end 126 of the cleaning tool 44 is facing away from the first transverse strut 66. In the embodiment shown in Figures 6, the pivoting in the clockwise direction. In the region of the front end 126, the distance D increases to the bottom 62. In the region of a rear end 162 of the cleaning tool 44, which is closest to the first transverse strut 66, the distance is maintained.

By increasing the distance D to the bottom 62 at the front end 162, the runnability of the floor cleaning machine 10 in the tilting transport position 120 of the tool holder 40 is increased with the cleaning tool 44. Compared to the transport position 112 with

approximately parallel orientation of the envelope plane 60 to the bottom 62, the distance D is increased, in particular to be able to drive on a ramp without the cleaning tool 44 in the region of the front end 126 increases the ramp. In Figure 7, for comparison, the transport position 112 with parallel

Orientation of the envelope plane 60 to the bottom 62 and the

Tilted transport position 120 shown.

The tilting transport position 120 is reached at the cleaning tool device 38 without additional Versteilantrieb. An operator of the floor cleaning machine can actively set the tilting transport position 120.

As a result of the length-variable design of the second longitudinal strut 74 with the spring device 92, the length of the second longitudinal strut 74 can be changed via force introduction by means of the abutment 118 into the polygonal link 64, and the tilted transport position 120 can be achieved.

The floor cleaning machine 10 can be realized in a structurally simple way with an increased Rampengängigkeit.

As already mentioned, the spring device 92 is arranged and designed in this way and, in particular, has such a great spring stiffness that the length-variable design of the second longitudinal strut 74 only then becomes effective comes when the counter portion 122 abuts against the stop 118 and the first longitudinal strut 72 is then pivoted upwards.

It is thereby introduced a constraint and ultimately an external force is introduced, which leads to an extension of the spring means 92 relative to the basic position 124 and thus to an extension of the second longitudinal strut 74 relative to an initial length between the third pivot axis 86 and the fourth pivot axis 90th leads. A typical way for the change in length of the second longitudinal strut is approximately 1 cm.

In the working position 114 (FIGS. 10, 11), the cleaning tool 44 is drained on the floor 62 via the adjusting device 104 so that the

Brushes 54 touch the bottom 62, wherein, as mentioned, the acute angle 116 is set. In this working position 114, the spring device 92 has no function. The spring device 92 is adjusted with respect to its spring stiffness so that the second longitudinal strut 74 can be regarded as rigid (fixed in length). It may happen that in the working position 114, the cleaning tool 44 abuts an obstacle 130 (Figure 13 (a)), wherein the obstacle is oriented transversely to the bottom 62. By abutting the obstacle 130 forces are exerted on the tool device 38 and the holding device 42, which may possibly lead to damage.

The forces arising from abutting the obstacle 130 are directed to the polygonal link 64. In principle, the first transverse strut 66, the second transverse strut 68 and the first longitudinal strut 72 are rigid. The second longitudinal strut 74 is not rigidly formed via the spring device 92. Forces acting with a force component 132 parallel to the direction 102 may result in compression of the spring means 92. This shortens the second longitudinal strut 74, that is the distance between the third pivot axis 86 and the fourth pivot axis 90 is shortened. This in turn causes a relative rotation of the cleaning tool 44 to the bottom 62. Compared to their default setting 124, the spring device 92 is compressed at sufficiently large force components 132. The length of the second longitudinal strut 74 is thereby shortened compared to its initial length.

This in turn causes an increase in the acute angle 116, with which the cleaning tool 44 with its envelope plane 60 against the

Floor 62 is oriented. A distance of the rear end 128 to the bottom 62 increases.

This enlargement is also made possible in that the brushes 54 are correspondingly flexible and can be bent over at the bottom 62.

As a result, the cleaning tool 44, so to speak, pivots away from the obstacle 130 and thereby deviates from the acting force.

In the illustration according to FIGS. 13 (a) to 13 (c), the corresponding deflection movement of the tool holder 40 with the cleaning tool 44 is in the counterclockwise direction. As a result, the force load on the cleaning tool 44 is reduced and the risk of damage is reduced.

A corresponding "brief" abutment of the cleaning tool to an obstacle 130 can often occur during a cleaning operation in the working position 114 of the cleaning tool 44. As a result of the solution according to the invention, a force load is reduced in a structurally simple manner and the risk of damage of the cleaning tool 44 and also of the holding device 42 is reduced. By the spring means 92, the cleaning tool 44 can escape.

FIG. 14 schematically shows the working position 114 for the cleaning tool 44 and a deflecting position in which the cleaning tool 44 deviates from an obstacle 130 on which the cleaning tool 44 abuts.

After elimination of the obstacle 130, for example, if the floor cleaning machine 10 resets something, the spring force of the spring means 92 causes a provision; the spring device 92 returns to its basic position 124, which is then the working position 114, in which the cleaning tool 14 lies at the specific acute angle 116 to the bottom 62. The cleaning process can be continued.

Above, an embodiment has been explained in which the spring device 92 is on the second longitudinal strut 74. Such a design is structurally advantageous, in particular when the second longitudinal strut 74 is located below the first longitudinal strut 72 with respect to the direction of gravity g and the first longitudinal strut 72 is actively pivoted (via the adjusting device 104). It is also possible that at one or more other struts a corresponding spring means is arranged to provide a variable-length strut.

In a schematic embodiment, which is shown in FIG. 16, a length-fixed first transverse strut 66, a length-fixed first longitudinal strut 72, a length-fixed second transverse strut 74 and a variable-length second transverse strut 68 'are provided, wherein a spring device 92' is inserted into the second transverse strut 68 '. is integrated. A corresponding polygonal link works as described above with reference to the polygonal link 64. For some applications, it may be advantageous if a spring device 92 'is oriented in the transverse strut 68', on which the tool holder 40 is seated.

For example, it is also possible for a spring device to be integrated in the first longitudinal strut 72 and / or in the first transverse strut 66.

According to the invention, a holding device 42 for a tool device (and in particular a cleaning tool device) is provided, in which at least one strut of a polygonal universal element 64 is variable in length. This variable-length education is passive. The variable length training is achieved by the integration of a spring device 92, 92 '. The spring device 92, 92 'is so hard that for the "normal" application, the corresponding strut with the spring means 92, 92' can be regarded as rigid. The normal operation is a normal cleaning operation or a transport operation in which, for example, the cleaning tool 44 is oriented with its envelope plane 60 parallel to a bottom 62.

The variable length education can be used to be active

or controlled to increase a Rampengängigkeit. By adjusting device 104, by which a height adjustment of the cleaning tool with respect to the chassis 12 and the bottom 62 is enabled, can be used to increase a distance at the front end 126 to the ground, without an additional adjustment drive must be provided , The passive spring device 92, 92 'is used to form the polygonallenker 64 variable in length and thereby achieve a defined pivoting of the tool holder 40 to increase a Rampengängigkeit. Furthermore, the spring means 92, 92 'can be used to achieve an automatic avoidance of obstacles 130 at a working position 114 of the cleaning tool 44 and thereby a

reduce mechanical stress on the cleaning tool 44 and the holding device 42.

By integrating a spring device 92, 92 'in at least one longitudinal strut (for example, in the second longitudinal strut 74), the length can both increase and decrease in relation to an initial length of the corresponding strut 74. This allows both the Rampengängigkeit be increased as well as avoidance when approaching an obstacle 130 is possible.

It is thereby provided a floor cleaning machine 10, which is structurally simple with respect to the tool device 38 and the holding device 42 and thereby has an extended functionality.

The floor cleaning machine 10 has been described in terms of its operation with respect to the polygonallenkers 64 using a cleaning tool 44. There are also other tillage tools with the inventive solution used, such as mowing tools, snow blades, balance bar, etc.

Another exemplary embodiment of a floor cleaning machine, which is shown in a schematic side view in FIG. 17 and designated by 150, comprises a chassis 152. A front wheel 154 and a rear wheel 156 are disposed on the chassis 152. The front wheel 154 includes a left and a right front wheel and the Rear wheel assembly 156 includes left and right rear wheels. In Figure 17, the left front wheel and the left rear wheel are visible.

The chassis 152 is formed as a bent handlebar with a front part 158 and a rear part 160. At the front part 158 sits the front wheel 154. At the rear part 160 sits the rear wheel 156. The front part 158 and the rear part 160 are above a Articulated joint 162 connected. The articulation 162 is positioned between the front wheel 154 and the rear wheel 156.

A pivot axis 164 of the articulated joint 162 is oriented perpendicular to an axis of rotation of the front wheel 154 and the rear wheel 156. The pivot axis 164 of the articulated joint 162 is oriented transversely and in particular perpendicular to a flat bottom 166 on which the floor cleaning machine 150 stands.

On the chassis 152, a driver's cab 168 is arranged on the front part 158. In one embodiment, a structure 170, which in particular comprises a dirt collecting container 174, is arranged on the rear part 160 of the chassis 152.

In particular, a motor housing 172, in which a drive motor for the floor cleaning machine 150 is positioned, is arranged on the rear part 160. The floor cleaning machine 150 is then rear-driven.

On the motor housing 172, the structure 170 is mounted. The floor cleaning machine 150 comprises a blower device, which is arranged on the structure 170 or in the motor housing 172 and which serves to generate a suction flow. Into the dirt collecting container 174 leads a suction tube 176. A corresponding suction mouth of the suction tube 176 is arranged below the chassis 152 and in particular below the front part 158 in the region of the front wheel 154. The generated suction stream draws in coarse dirt, which is collected in the dirt collecting tank 174.

The chassis 152 has a front end 178 and a rear end 180. The front end 178 is located on the front part 158 and the rear end 180 is located on the rear part 160.

At the front part 158 of the chassis 152 sits in the region of the front end 178, a first tool device and a second tool device. These tool devices are basically the same design as the tool device 38 described above and therefore the same reference numeral is used.

The tooling means 38 protrude beyond the front end 178 of the chassis. They form a front end of the floor cleaning machine 150.

They also protrude laterally beyond the chassis 152 and form an outer lateral end of the floor cleaning machine 150 on the left and right. The floor cleaning machine 150 has its greatest width on the tool devices 38.

The tool devices 38 are held on the chassis 152 via respective holding devices. These holding devices are basically the same structure as the holding devices 42. Therefore, the same reference numerals as in the floor cleaning machine 10 is used.

The floor cleaning machine 150 is formed in one embodiment as a municipal sweeper. In this case, the Tool device 38 as a tillage tool a cleaning tool, namely a sweeping tool.

It is also possible for the tool device 38 of the floor cleaning machine 150 to be operated with other tillage tools, such as mowing tools, scrubbing tools, snow blades, balance bars, etc. In particular, the tool device 38 is designed such that different tillage tools can be operated on it or is the holding device 42 designed so that at her different tool devices can be fixed and operated.

It is also possible that different combinations of tool device and holding device can be mounted on the chassis 152 in order to allow different possible uses for the floor cleaning machine 10.

With respect to the polygonallenkers 64, the floor cleaning machine 150 operates as described above with reference to the floor cleaning machine 10.

LIST OF REFERENCE NUMBERS

Floor cleaning machine

chassis

front facility

rear facility

Right rear wheel

Steerable front wheel

driver's seat

steering wheel

cultivation

front end

rear end

Forward direction

bottom of page

tooling

a tool device

b tool device

tool holder

holder

Tillage tool

rotary drive

axis of rotation

sweeping tool

brush plate

to brush

angle

The End

Einhüllendenebene

ground

Polygonallenker First cross brace

Second cross strut 'Second cross strut

fixing device

First longitudinal strut

Second longitudinal strut 'Second longitudinal strut

First swivel joint

First pivot axis

Second swivel joint

Second pivot axis

Third swivel joint

Third pivot axis

Fourth swivel joint

Fourth pivot axis

Spring device 'spring device

First area

Second area

Coil spring0 spring force

2 direction

4 adjusting device 6 member

8 First articulation point0 Second articulation point2 Transport position4 Working position

6 acute angle

8 stop

0 tilting transport position2 counter area

4 basic position 126 front end

128 Rear end

130 obstacle

132 force component

150 floor cleaning machine (second embodiment)

152 chassis

154 front wheel device

156 rear wheel device

158 front part

160 Rear part

162 articulation

164 pivot axis

166 floor

168 driver's cab

170 construction

172 motor housing

174 dirt collector

176 intake manifold

178 front end

180 rear end

Claims

claims

A floor cleaning machine comprising a chassis (12; 152),

at least one tool device (38) with at least one tool holder (40) and with a soil cultivation tool (44) seated on the at least one tool holder (40), and a holding device (42) which supports the at least one tool holder (40) on the chassis (12 152), the holding means (42) comprising a polygonal link (64) having a first crossbar (66) fixed relative to the chassis (12; 152) with a second crossbar (68) relative to which at least one tool holder (40) is fixed, with a first longitudinal strut (72), which is articulated via a first pivot joint (76) about a first pivot axis (78) pivotally mounted on the first cross member (66) and which via a second pivot joint (80 ) is articulated pivotally about a second pivot axis (82) to the second crossbar (68), and to a second longitudinal strut (74) which pivots about a third pivot (84) about a third pivot axis (86) ar is articulated on the first transverse strut (66) and pivotably connected to the second transverse strut (68) about a fourth pivot axis (90) via a fourth pivot joint (88), characterized in that at least one strut (74) of the polygonal link (8) 64), a spring device (92) is integrated, by means of which a length of the corresponding strut (74) between pivot axes (86, 90) for the at least one strut (74) in response to a polygonallenker (64) acting force is variable.

2. Floor cleaning machine according to claim 1, characterized in that the first transverse strut (66) is formed fixed in length and / or the second transverse strut (68) is formed fixed in length.

3. Floor cleaning machine according to claim 1 or 2, characterized in that the spring device (92) in the first longitudinal strut (72) and / or the second longitudinal strut (74) is integrated.

4. floor cleaning machine according to one of the preceding claims, characterized in that the spring means (92) is arranged and formed on the polygonal link (64) that the shape of a between the pivot axes (78, 82, 86, 90) formed polygon due to a Length variation of the at least one strut (74) by the spring means (92) is variable, in particular a change in shape of the polygon causes a change in position of the at least one tool holder (40) relative to the chassis (12).

5. Floor cleaning machine according to one of the preceding claims, characterized in that the spring device (92) on the polygonal link (64) is arranged and designed such that an effective sufficiently large force on the polygonal link (64) relative pivoting of at least one tool holder ( 40) to the chassis (12; 152) or a floor (62; 166) on which the floor cleaning machine is installed.

6. Floor cleaning machine according to one of the preceding claims, characterized in that the spring device (92) has such a minimum hardness that the forces occurring in a normal tillage process cause no relevant change in position of the at least one tool holder (40) to the chassis (12; ,

7. floor cleaning machine according to one of the preceding claims, characterized in that a spring rate of the spring means (92) at least 10 N / mm and in particular at least 20 N / mm and in particular at least 30 N / mm and in particular at least

40 N / mm and in particular at least 50 N / mm and in particular at least 55 N / mm.

8. Floor cleaning machine according to one of the preceding claims, characterized in that the polygonal link (64) is designed as a trapezoidal link or Parallelogrammlenker.

9. Floor cleaning machine according to one of the preceding claims, characterized in that the at least one strut (74) with the spring means (92) has a first region (94) which is fixed in length and which is arranged on a pivot joint (88), a second A region (96) which is fixed in length and which is arranged on a further pivot joint (84) and at least one spring (98) which is fixed to the first region (94) and the second region (96) and between the first area (94) and the second area (96) is positioned.

10. Floor cleaning machine according to one of the preceding claims, characterized in that the spring device (92) in the second longitudinal strut (74) is integrated and the first longitudinal strut (72) is formed fixed in length, wherein the first longitudinal strut (72) with respect to the direction of gravity ( g) is arranged above the second longitudinal strut (74) when the floor cleaning machine is standing on a floor (62) and / or at the first longitudinal strut (72) an adjusting device (104) for adjusting a height position of the tool receptacle (40) relative to the Ground (62) attacks.

11. Floor cleaning machine according to one of the preceding claims, characterized in that the spring device (92) has a basic position (124) through which an initial length of the at least one strut (74) with the spring means (92) is defined, and that a spring force endeavors is to bring the spring device (92) in the basic position (124).

12. floor cleaning machine according to claim 11, characterized in that the length of the at least one strut (74) with the spring means (92) in dependence on the force acting on the initial length is reduced or increased.

13. floor cleaning machine according to claim 12, characterized in that at a reduction compared to the initial length, a relative tilting of the at least one tool holder (40) is effected, wherein a distance to a bottom (62) of the first crosspiece (66) facing end ( 128) of a cleaning tool (44) increases.

14. Floor cleaning machine according to claim 12 or 13, characterized in that at a magnification relative to the initial length, a relative tilting of the at least one tool holder (40) is effected, in which a distance to a bottom (62; 166) of the first transverse strut ( 66) facing away from the end (126) of a tillage tool (44) increases.

15. Floor cleaning machine according to one of the preceding claims, characterized by an adjusting device (104) which is associated with the holding device (42) through which a height distance of the at least one tool holder (40) to a bottom (62; 166) on which the floor cleaning machine stands up, lockable is adjustable.

16. Floor cleaning machine according to claim 15, characterized by one or more working positions (114) of the at least one tool device (38), in which one or more tillage tools (44) act on the floor to be cleaned (62; 166), and one or more transport positions (112), in which the one or more

Tillage tools (44) spaced from the bottom (62; 166).

17. floor cleaning machine according to claim 15 or 16, characterized in that the adjusting device (104) comprises at least one driven length-adjustable member (106) which with a first pivot point (108) to the first longitudinal strut (72) or the second longitudinal strut (74) is articulated and with a second articulation point (110) to the first transverse strut (66) or to the chassis (12) is articulated, wherein by the length-adjustable member (106) is a distance between the first articulation point (108) and the second articulation point (110 ) is adjustable adjustable.

18. Floor cleaning machine according to one of the preceding claims, characterized in that the spring device (92) on the polygonal link (64) is arranged and designed such that upon application of force to the at least one tillage tool (44) with a sufficiently large force component along a Federkraftwirkungsrichtung ( 102) of the spring device (92) a length of the at least one strut (74) with the spring device (92) decreases.

19. Floor cleaning machine according to one of the preceding claims, characterized in that the at least one strut (74) with the spring device (92) is associated with a stop (118) which at a defined height position of the holding device (42) relative to the chassis (12 152) and in particular in a transport position (112) of the at least one tool holder (40) is effective.

A floor cleaning machine according to claim 19, characterized in that the stop (118) is adapted to block mobility of a portion (96) of the at least one strut (74) with the spring means (92) when the portion (96) abuts on the stop (118), and then on the spring means (92), the at least one strut (74) is extendable.

21. Floor cleaning machine according to one of the preceding claims, characterized in that the at least one tool receiving (40) is associated with a rotary drive (86) for the tillage tool (44), which sits in particular on the at least one tool holder (40).

22. Floor cleaning machine according to one of the preceding claims, characterized in that the at least one tool device (38) is designed as a cleaning tool device, and that the tillage tool (44) is a cleaning tool such as a sweeping tool or scrubbing tool.

23. Floor cleaning machine according to one of the preceding claims, characterized in that the chassis (12; 152) with respect to a forward direction (32) has a front end (28; 178) and a rear end (30; 180), and that the at least one tillage tool (44) projects beyond the front end (28; 178) and / or the rear end (30; 180) and / or beyond a side end (34, 36).

24. A method for operating a floor cleaning machine according to one of the preceding claims, wherein in a transport position (112) a distance to a bottom (62; 166) of the first crosspiece (66) facing away from the end (126) of a cleaning tool (44) is increased in that the holding device (42) is pivoted away from the bottom (62; 166) and the at least one strut (74) bears with the spring device (92) with a region (96) against a stop (118), whereby the length of the at least one strut (74) is enlarged with the spring device (92).

25. A method for operating a floor cleaning machine according to one of claims 1 to 23, wherein the spring means (92) is formed so that in a working position (114) of a tillage tool (44) a tilting movement of the tillage tool (44) is effected, if the Soil tilling tool (44) abuts an obstacle (130) having a bearing surface oriented transverse to a bottom (62; 166), the at least one strut (74) engaging with the spring means (92) due to the impact force Force shortens their length and thereby a distance to the bottom (62) of the first crosspiece (66) facing the end (128) of the soil working tool (44) increases.