DE202021105544U1 - Walk-behind lawn mower - Google Patents

Abstract

Walk-behind lawn mower, comprising at least:1.1. a housing,1.2. at least one pair of wheels (1, 2) pivotably mounted on the housing, and1.3. a height adjustment device (10) for adjusting the cutting height of a mowing mechanism of the lawn mower, by means of which the pairs of wheels (1, 2) can each be pivoted about a pivot axis (S) into at least two different positions, wherein1.4. the height adjustment device (10) has at least one coupling device (20) via which the pivot axes (S) of the pairs of wheels (1, 2) are coupled to one another, and1.5. an actuating device (30) movably mounted on the housing for the height adjustment device (10), characterized in that1.6. the actuating device (30) has a connecting link (31), in which a locking element rigidly connected to the coupling device (20) engages in different positions, so that a different position of the wheel pairs (1, 2) and a different cutting height are set with each position of the locking element will.

Description

The invention relates to a hand-held lawn mower, at least having a housing, at least one pair of wheels pivotally mounted on the housing, and a height adjustment device for adjusting the cutting height of a mowing mechanism of the lawn mower, by means of which the pairs of wheels can each be pivoted about a pivot axis into at least two different positions , wherein the height adjustment device has at least one coupling device, via which the pivot axes of the pairs of wheels are coupled to one another, and an actuating device, which is movably mounted on the housing, for the height adjustment device.

A method for adjusting the cutting height of a hand-held lawn mower is also described.

From the pamphlet DE 10 2017 205 289 A1 is a soil cultivation device, for example a lawn mower, with a housing on which at least two wheels are pivotably mounted, with a height adjustment device for adjusting the cutting height, via which the wheels can be fixed in at least two different positions about a pivot axis relative to the housing, the height adjustment device being a coupling element for coupling the pivoting movements of the wheels and an actuating element is known. In this lawn mower, the actuating element is mounted in a translationally movable manner on, in particular in, the housing and the actuating element is positively connected to the coupling element via a fixing area, with an actuating area of the actuating element and the fixing area being immovable relative to one another.

In this embodiment of the cutting height adjustment, the actuating element is manually moved in a translatory manner and thereby released from the fixing area of the coupling element. The form-fitting element is rigidly connected to the coupling link. Furthermore, the actuating element and the fixing area are also designed to be immovable with respect to one another.

It is the object of the invention to provide an alternative cutting height adjustment for walk-behind lawn mowers.

This problem is solved by the features of the independent claims. Advantageous developments of the invention are the subject matter of subordinate claims.

Accordingly, the inventors propose a hand-held lawn mower, at least having a housing, at least one pair of wheels pivotally mounted on the housing, and a height adjustment device for adjusting the cutting height of a mowing mechanism of the lawn mower, by means of which the pairs of wheels can each be moved about a pivot axis into at least two different positions can be pivoted, with the height adjustment device having at least one coupling device via which the pivot axes of the pairs of wheels are coupled to one another, and an actuating device for the height adjustment device, which is movably mounted on the housing, to the effect that the actuating device has a link into which a rigidly connected the locking element connected to the coupling device engages in different positions, so that a different position of the wheel pairs and a different cutting height are set with each position of the locking element.

It is pointed out that although the invention is described using a lawnmower, the features that are essential to the invention can be transferred to any hand-held soil cultivation device such as rotary mowers, scarifiers, etc., and this is also within the scope of the invention.

In addition to the multi-part housing and the mowing mechanism, the lawn mower according to the invention also has other components such as in particular an internal combustion engine or an electric motor for driving the mowing mechanism, a handle bar for pushing the lawn mower etc. The engine and mower deck are at least partially disposed within the housing. The deck is suspended from the housing.

Furthermore, the lawn mower has at least one pair of wheels, preferably two pairs of wheels, in particular a rear and a front pair of wheels. In the following, the relative terms "front" and "rear" refer to the direction of forward movement of the lawn mower during mowing. The terms "below" and "above" refer to a surface to be mowed by the lawnmower.

The two wheels of the wheel pairs each have a central axis of rotation about which the wheels rotate when the lawn mower moves. Furthermore, the two wheels or pairs of wheels can each be pivoted about a pivot axis. Preferably, at least the pivot axis of the front pair of wheels is fixed and pivotably mounted on the housing. Both pivot axes are particularly preferably fixed to the housing. The result of this is that the housing and the mower fixed to the housing move up and down when the pairs of wheels are pivoted ter is moved and its height changes. The axes of rotation and the pivot axes are each spaced apart from one another and advantageously run parallel. The rotation axes and the pivot axes are also advantageously connected to one another, advantageously rigidly connected. According to the invention, the pivot axes are also coupled to one another via the coupling device. Preferably, the coupling of the pivot axes also results in a coupling of the pivoting movements of the pairs of wheels, so that the pairs of wheels are always pivoted together and simultaneously. The deflection of the pairs of wheels when swiveling can vary depending on the wheel pressure gauge, distance between the axles, etc., but the stroke of the mower is the same at the front and rear.

The wheels can be fixed in different positions, whereby the distance between the housing with the mower and the ground is different in each position. This results in a different height of the mower or different cutting height in each wheel position.

According to the invention, the actuating device has a connecting link. A locking element rigidly connected to the coupling device engages in the connecting link, with the wheels being set in different positions or the mowing mechanism with a different cutting height depending on the position in which the locking element engages in the connecting link. The connecting link is moved with the actuating device, that is to say it moves relative to the coupling device and the locking element rigidly arranged thereon.

Both the actuating device and the coupling device can be moved relative to the housing. When the wheels pivot, the coupling device with the locking element moves back and forth relative to the housing. The actuator with link moves up and down relative to the housing.

A preferred embodiment provides that the actuating device has a manually operable pressure element in order to release the connecting link from the locking element. The pressure element is advantageously designed as a spring-loaded push button, which is located on the outside of the housing. When the push button is actuated, preferably a pushing movement directed downwards in translation, the connecting link is moved or pressed downwards. Correspondingly, the pressure element is preferably mounted immovably relative to the connecting link, for example connected by means of a rod. When the link is pressed down, the engagement of the locking element is released, with the locking element not moving in the process.

The pressure element or the push button is advantageously spring-loaded, so that when the push button is not actuated or released, it and the connecting link rigidly connected to it return to the starting position.

The preferred embodiment also provides that the connecting link has a sprocket section with a plurality of interdental spaces, into which the locking element engages. Advantageously, the sprocket section has a curved shape, in particular a shape that is curved upwards, with the teeth pointing upwards. The spaces between the teeth are therefore advantageously open at the top. The locking element thus engages in the respective interdental space from above. Each space between the teeth preferably defines a position of the locking element and thus a pivoting position of the wheels, ie in turn a specific distance between the housing and the ground or a specific cutting height of the mower.

Furthermore, the toothed ring section advantageously has a plurality of tooth gaps, for example three, four, five or more, so that the cutting height can be set as variably as possible and at many arbitrary heights.

In a preferred embodiment, the coupling device has at least one connecting rod which connects the pivot axes of the wheel pairs to one another in an articulated manner. The at least one connecting rod is advantageously connected to the pivot axes of the pairs of wheels in each case via a coupling axis. For the sake of simplicity, preferably only one connecting rod is formed on only one side of the lawnmower. In a simple embodiment, the connecting rod is connected directly or immediately to the pivot axes. In a preferred embodiment, the connecting rod is only indirectly connected in an articulated manner to the pivot axes, for example via a further coupling axis in each case. The connecting rod is therefore preferably connected via the coupling axis to the pivot axis and further to the axis of rotation of the pairs of wheels. The three axes of each pair of wheels, ie the coupling axis, pivot axis and axis of rotation, are advantageously connected to one another in the aforementioned order and each form a triangle, with the two triangles formed at the rear and at the front being different. The shape of the triangle changes depending on the position of the pairs of wheels and pivot axes.

A preferred embodiment also provides that the housing is connected to the height adjustment device; in particular, the coupling device is preferably connected to the housing in a spring-loaded manner. On the one hand, the housing is fixed to the pivot axes of the pairs of wheels and, on the other hand, it is connected to the coupling device. If the pairs of wheels are moved about the pivot axes, the housing will inevitably move with them and the distance between the housing and the wheels and the floor will be changed.

The connection of the coupler to the housing is preferably spring loaded to pull the wheel pairs rearwardly to a neutral position when the locking member is disengaged from the link. A neutral position is the highest position of the housing or mower. A tension spring is preferably provided for this purpose, which forms the connection to the housing. The tension spring is advantageously connected on the one hand to the at least one connecting rod and on the other hand to the housing. Advantageously, the tension spring pulls the connecting rod with the pair of front wheels connected to it backwards and thus facilitates the lifting of the lawn mower by the housing.

The locking element is preferably a pin, which is arranged on the at least one connecting rod and engages in the interdental spaces of the toothed ring section. The locking element is advantageously rigidly formed on the connecting rod, particularly advantageously in one piece or in one piece with the connecting rod. The pin engages in the spaces between the teeth from above and is advantageously held there in a positive and/or non-positive manner. The shape of the interdental spaces is particularly favorable, at least partially complementary to the shape of the pin.

In a simple and preferred embodiment, the housing has a handle with which the housing can be lifted up and pushed down manually. The handle is advantageously located in close proximity to the push button of the actuator. Advantageously, the push button and the handle can be operated by one hand of a user simultaneously with one hand.

In a further embodiment, a display is arranged on the housing, on which the currently set position and/or cutting height is displayed. For example, the display is coupled to the locking element such that a change in the position of the locking element in the sprocket section causes a change in the displayed position and/or cutting height.

• - Manuelles Betätigen des Druckelementes zum Lösen des Zahnkranzabschnittes von dem Arretierelement,
• - Manuelles Anheben oder Absenken des Gehäuses und dabei Verschwenken der Räderpaare in eine andere Position, und
• - Loslassen des Druckelementes, sodass das Arretierelement wieder in den Zahnkranzabschnitt eingreift und das Mähwerk in einer der Position des Arretierelementes in dem Zahnkranzabschnitt entsprechenden Schnitthöhe eingestellt ist.

Furthermore, a method for adjusting the cutting height of a hand-held lawn mower according to the invention, as described above, is also described, at least having the following method steps:

• - Manual actuation of the pressure element to release the sprocket section from the locking element,
• - Manually raising or lowering the housing, thereby pivoting the pairs of wheels to a different position, and
• - Releasing the pressure element, so that the locking element engages again in the toothed ring section and the mowing mechanism is set in a cutting height corresponding to the position of the locking element in the toothed ring section.

As a starting position, the cutting height of the mower is set, for example, to a minimum height and the pin engages in a first space between the teeth. The pairs of wheels are in a first position, the distance between the housing with the mower deck and the ground also being minimal.

In a first step, the push button is actuated, i.e. pressed down, with the backdrop being pressed down with it. In doing so, the pin is released from a tooth gap, since the toothed ring section is moved downwards and the pin remains rigid in its position. Without the pin being fixed in the sprocket section, the pairs of wheels can be moved freely about the pivot axis.

In a next step, therefore, the housing can be lifted by the handle, the pairs of wheels being pivoted. When the housing is raised, the cutting height increases automatically. If the cutting height is high enough, i.e. if the housing is raised far enough, the push button can be released next so that the link with the toothed ring section moves up again and the pin engages in a tooth gap again.

In order to lower the mower, the method steps described above are advantageously carried out in the same order, but the housing is not raised but is pressed down or lowered.

Particularly advantageously, the push button can be pressed and the housing can be lifted up or pressed down with one hand, without releasing or gripping the handle in between.

The invention is described in more detail below on the basis of a preferred exemplary embodiment with the aid of the figures, with only the features necessary for understanding the invention being shown.

• 1: eine schematische Perspektivansicht einer Höhenverstelleinrichtung in einer tiefsten Position,
• 2: eine schematische Perspektivansicht der Höhenverstelleinrichtung gemäß 1,
• 3: eine schematische Draufsicht der Höhenverstelleinrichtung gemäß der 1,
• 4: eine schematische Seitenansicht der Höhenverstelleinrichtung gemäß der 1,
• 5: eine schematische Perspektivansicht eines nur teilweise montierten Rasenmähers mit der Höhenverstelleinrichtung gemäß der 1,
• 6: eine schematische Perspektivansicht einer Höhenverstelleinrichtung in einer höchsten Position,
• 7: eine schematische Perspektivansicht der Höhenverstelleinrichtung gemäß 6,
• 8: eine schematische Draufsicht der Höhenverstelleinrichtung gemäß der 6,
• 9: eine schematische Seitenansicht der Höhenverstelleinrichtung gemäß der 6, und
• 10: eine schematische Perspektivansicht eines nur teilweise montierten Rasenmähers mit der Höhenverstelleinrichtung gemäß der 6.

They show in detail:

• 1 : a schematic perspective view of a height adjustment device in a lowest position,
• 2 : a schematic perspective view of the height adjustment device according to FIG 1 ,
• 3 : a schematic plan view of the height adjustment device according to FIG 1 ,
• 4 : a schematic side view of the height adjustment device according to FIG 1 ,
• 5 : a schematic perspective view of an only partially assembled lawn mower with the height adjustment device according to FIG 1 ,
• 6 : a schematic perspective view of a height adjustment device in a highest position,
• 7 : a schematic perspective view of the height adjustment device according to FIG 6 ,
• 8th : a schematic plan view of the height adjustment device according to FIG 6 ,
• 9 : a schematic side view of the height adjustment device according to FIG 6 , and
• 10 : a schematic perspective view of an only partially assembled lawn mower with the height adjustment device according to FIG 6 .

the 1 until 5 show a height adjustment device 10 in a lowest position and the 6 until 10 show this height adjustment device 10 in a highest position, each in several views.

In the 1 a schematic perspective view of a height adjustment device 10 is shown in a lowest position. The height adjustment device 10 is used to set the cutting height of a mower, not shown here, with the height adjustment device 10 being shown or set in such a way that this corresponds to a minimum cutting height. The lawn mower, which is not shown in full here, comprises two pairs of wheels 1, 2. The wheels of the pairs of wheels 1, 2 rotate about an axis of rotation R during the mowing process. Furthermore, the pairs of wheels 1, 2 are each pivoted about a pivot axis S, with the axis of rotation R being unequal of the pivot axis S, see for example 3 and 4 . According to the presentation of 1 the pairs of wheels 1, 2 are pivoted into a lowest position shown as an example.

Furthermore, the height adjustment device 10 includes a coupling device 20 which couples the two pivot axes S to one another. For this purpose, the coupling device 20 comprises a connecting rod 22 which is connected to the two pivot axes S on the left-hand side of the lawn mower at each end. This is an articulated connection in each case, with one joint part 23 or 24 being connected via a coupling axis K to the front or rear pivot axis S, respectively. The three axes - coupling axis K, pivot axis S and rotation axis R - are each arranged parallel to one another.

In the fully assembled state, the height adjustment device 10 is connected to the housing of the lawnmower. On the one hand, the front area of the housing is firmly connected to the pivot rod 12 forming the front pivot axis S by means of a connecting part 11 . On the other hand, the connecting rod 22 of the coupling device 20 is connected to the housing in a spring-loaded manner. For this purpose there is a tension spring 25 which is hooked into the connecting rod 22 on the one hand and into the housing on the other hand. The tension spring 25 is prestressed in such a way that it always pulls the front pivot axis S or the front pair of wheels 1 backwards and thus supports an upward movement of the lawn mower, ie raising and increasing the set height.

In addition, the height adjustment device 10 comprises an actuating device 30 which is movably mounted on the housing of the lawn mower (not shown here) and whose manual actuation causes the height adjustment of the lawn mower. The actuating device 30 has an actuating element designed as a push button 34 which projects out of the housing and is spring-mounted on an actuating rod 36 which projects into the housing by means of a compression spring 35 . The compression spring 35 is prestressed and pushes the push button 34 upwards out of the housing. In addition, the actuating device 30 has a link 31 which is rigidly connected to the actuating rod 36 . Actuating and pressing down the push button 34 always causes the gate 31 to be pushed down. The gate 31 contains a toothed ring section 32 with a plurality of teeth and tooth spaces 33.

A locking element designed as a pin 21 is rigidly and immovably arranged on the connecting rod 22 of the coupling device 20 not. Depending on the position, the pin 21 engages in an interdental space 33 in the link 31 . Depending on the interdental space 33 in which the pin 21 is located, a different position or height is set. In the lowest position shown here, the pin 21 is positioned in the far left or front interdental space 33 .

In the 2 FIG. 12 is a schematic perspective view of the height adjustment device 10 according to FIG 1 shown. From this perspective, link 31 of the coupling device can be seen particularly well. The connecting link 31 is rectangular and is arranged in the vicinity of the rear pair of wheels 2 . The toothed ring section 32 bent upwards with a plurality of teeth and spaces 33 between the teeth which are open at the top is arranged in the outer connecting link 31 . In the embodiment shown here, the sprocket section 32 has six spaces 33 between the teeth. The shape of the interdental spaces 33 corresponds to the shape of the pin 21 so that the pin 21 engages in the respective interdental space 33 in a positive and non-positive manner. Each tooth space 33 corresponds to a height of the mower. That is, according to this exemplary embodiment, the mower deck can be set to six different cutting heights.

In the 3 is a schematic plan view of the height adjustment device 10 according to FIG 1 shown. The connecting rod 22 is located on the left side. The order of the components connected via the connecting rod 21 from the front pair of wheels 1 to the rear pair of wheels 2 is as follows: front swivel rod 12 of the front pair of wheels 1 - swivel axis S - front joint part 23 - coupling axis K - connecting rod 21 - coupling axis K - rear joint part 24 - swivel axis S - rear swivel rod 12 of the rear pair of wheels 2. The axes K, S, R are connected to one another in an articulated manner and, depending on the set height, have a different position relative to one another, but form a triangle.

In the 4 is a schematic side view of the height adjustment device 10 according to FIG 1 shown. For a better overview, the two left wheels are not shown here. From the side you can see that the three axes K, S, R are arranged in a triangle to each other at the front and rear. Pivoting of the front pair of wheels 1 is transmitted to the rear pair of wheels 2 by means of the connecting rod 22, so that the rear pair of wheels 2 is pivoted. The deflection of the pivoting movements of the two pairs of wheels 1, 2 about the pivot axes S differs depending on the wheel diameter, dimensions of the individual components, etc., although the mower is approximately horizontal at all set heights.

In the 5 13 is a schematic perspective view of an only partially assembled lawnmower with a height adjustment device 10 in the lowest position according to FIGS 1 until 4 shown. In this partially assembled situation, the hand-held lawn mower also includes a lower housing part 3 of a housing, on or under which a mowing mechanism (not shown here) is attached. The housing part 3 is firmly connected to the connecting part 11 on the front pivot axis S of the front pair of wheels 1 . According to the representation shown here, the housing or the mower is set in the lowest position, i.e. with the minimum cutting height h. The rear end of the tension spring 25, which connects the coupling device 20, more precisely the connecting rod 22, to the housing, is hooked into a hook 4 on the housing part 3. The tension spring 25 is pretensioned so that the front pair of wheels 1 is pulled backwards.

the 6 until 10 12 show the height adjustment device 10 in a highest position for comparison. The execution of the height adjustment device 10 corresponds to 1 until 5 . In the following, therefore, only the differences in relation to the set highest position will be discussed.

Identical components are marked with the same reference symbols.

In the highest set position, the pairs of wheels 1, 2 are pivoted about the pivot axes S in such a way that the distance between the housing and the floor is at a maximum and thus at least the front pivot axis S, on which the housing is fixed, is as high as possible, see schematic perspective view of 6 . Furthermore, the tension spring 25 is significantly relaxed or shortened in the highest position compared to the lowest position, since the connecting rod 22 moves backwards into the highest position when the pairs of wheels 1, 2 pivot.

Correspondingly, the pin 21 , which is rigid with the connecting rod 22 , is moved backwards, viewed relative to the connecting link 31 . In the highest position, the pin 21 is positioned in the rearmost interdental space 33, see schematic perspective view of FIG 7 .

The order of the interconnected components from the front pair of wheels 1 to the rear pair of wheels 2 is unchanged. However, due to the pivoting movement of the wheels pairs 1, 2 changed the position of the axes K, S, R relative to each other, see schematic top view of 8th . The pivot axes S are each in front of the coupling axes K, the axis of rotation R is behind. In the 8th it is also easy to see that the tension spring 24 is significantly shorter and relaxed compared to the lowest position, see for example 3 .

In the 9 a schematic side view is shown; for a better overview without the left wheels. The three axes K, S, R at the front and rear are still arranged in a triangle to each other, but the orientation of the triangle has changed. The coupling axes K are each positioned above the pivot axes S and the lowest-lying axes of rotation R.

In the 10 13 is another schematic perspective view of a partially assembled lawnmower in the highest position according to FIGS 5 until 8th shown. The housing part 3 has a significantly greater distance from the ground and the cutting height h set with it is significantly greater.

To adjust the cutting height from a low position to a higher position, the push button 34 is first pressed down manually. In the process, link 31 is also pushed down, so that pin 21 no longer engages in one of the spaces 33 between the teeth. Next, the housing can be manually lifted using a handle located in close proximity to the push button 34. The pairs of wheels 1, 2 are pivoted about the pivot axes S. When the desired height of the housing is reached, the push button 34 is released. This moves spring-loaded back up and pulls the backdrop 31 up. The toothed ring section 32 pushes itself around the pin 21 again from below, so that the pin 21 is finally positioned in a different interdental space 33 in a positive and non-positive manner. The cutting height set in this way corresponds to the position of pin 21 in link 31.

Although the invention has been illustrated and described in detail by the preferred embodiment, the invention is not limited by the disclosed examples and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention. In particular, the invention is not limited to the specified combinations of features, but other combinations and sub-combinations that are obviously executable for a person skilled in the art can also be formed from the disclosed features. Embodiments are therefore also to be regarded as included and disclosed by the invention which are not explicitly shown or explained in the figures, but which result from the explained embodiments and can be generated by means of separate combinations of features. Likewise, it is also within the scope of the invention to cause a mechanical reversal of the functions of the individual mechanical elements of the invention.

Reference List

1

Pair of wheels, front

2

Pair of wheels, rear

3

housing part

4

hook

10

height adjustment device

11

connection part

20

coupling device

21

cones

22

connecting rod

23

Joint part, front

24

Joint part, rear

25

tension spring

30

actuating device

31

backdrop

32

sprocket section

33

interdental space

34

push button

35

compression spring

36

operating rod

H

cutting height

K

coupling axis

R

axis of rotation

S

pivot axis

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 102017205289 A1 [0003]

Claims (14)

Hand-held lawn mower, comprising at least: 1.1. a housing, 1.2. at least one pair of wheels (1, 2) pivotably mounted on the housing, and 1.3. a height adjustment device (10) for adjusting the cutting height of a mowing mechanism of the lawnmower, by means of which the pairs of wheels (1, 2) can each be pivoted about a pivot axis (S) into at least two different positions, with 1.4. the height adjustment device (10) has at least one coupling device (20) via which the pivot axes (S) of the pairs of wheels (1, 2) are coupled to one another, and 1.5. an actuating device (30) movably mounted on the housing for the height adjustment device (10), characterized in that 1.6. the actuating device (30) has a connecting link (31), in which a locking element rigidly connected to the coupling device (20) engages in different positions, so that a different position of the wheel pairs (1, 2) and a different cutting height are set with each position of the locking element will. Lawnmowers according to the foregoing protection claim 1 , characterized in that at least the pivot axis (S) of the front pair of wheels (1) is fixed to the housing. Lawn mower according to any of the preceding Claims for protection 1 until 2 , characterized in that the actuating device (30) has a manually operable pressure element in order to release the link (31) from the locking element. Lawnmowers according to the foregoing protection claim 3 , characterized in that the pressure element is mounted immovably relative to the link (31). Lawn mower according to any of the preceding Claims for protection 1 until 4 , characterized in that the connecting link (31) has a sprocket section (32) with a plurality of interdental spaces (33) into which the locking element engages. Lawn mower according to any of the preceding Claims for protection 1 until 5 , characterized in that the coupling device (20) has at least one connecting rod (22) which connects the pivot axes (S) of the wheel pairs (1, 2) to one another in an articulated manner. Lawnmowers according to the foregoing protection claim 6 , characterized in that the at least one connecting rod (22) is connected in each case via a coupling axis (K) to the pivot axes (S) of the pairs of wheels (1, 2). Lawn mower according to any of the preceding Claims for protection 1 until 7 , characterized in that the housing is connected to the height adjustment device (10). Lawnmowers according to the foregoing protection claim 8 , characterized in that the coupling device (20) is spring-loaded connected to the housing. Lawnmowers according to the foregoing protection claim 9 , characterized in that a tension spring (25) is provided which is connected on the one hand to the at least one connecting rod (22) and on the other hand to the housing. Lawn mower according to any of the preceding Claims for protection 6 until 10 , characterized in that the locking element is a pin (21) which is arranged on the at least one connecting rod (22) and engages in the interdental spaces (33) of the ring gear section (32). Lawn mower according to any of the preceding Claims for protection 1 until 11 , characterized in that the housing has a handle. Lawn mower according to any of the preceding Claims for protection 1 until 12 , characterized in that a display is arranged on the housing, on which the currently set position and/or cutting height is displayed. Lawnmowers according to the foregoing protection claim 13 , characterized in that the display is coupled to the locking element, so that a change in the position of the locking element in the sprocket portion (32) causes a change in the displayed position and / or height of cut.

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