SE2051268A1

SE2051268A1 - Lawnmower cutting assembly and lawnmower

Info

Publication number: SE2051268A1
Application number: SE2051268A
Authority: SE
Inventors: Jonathan Björn; Malin Steen; Peter Hallin
Original assignee: Husqvarna Ab
Priority date: 2020-11-02
Filing date: 2020-11-02
Publication date: 2022-05-03
Also published as: SE544389C2; DE102021128365A1

Abstract

A lawnmower cutting assembly (1) is disclosed comprising a cutting unit (3), a drive shaft (5) configured to rotate the cutting unit (3) around a common rotation axis (Ax), and a hight adjustment mechanism (7) comprising a first mechanism member (11) arranged in an interface between the drive shaft (5) and the cutting unit (3). The first mechanism member (11) is rotationally arranged relative to the drive shaft (5) to allow or cause a change in the position of the cutting unit (3) relative to the drive shaft (5) in directions (d1, d2) coinciding with the common rotation axis (Ax) when the first mechanism member (11) is rotated from a first position to a second position relative to the drive shaft (5). The present disclosure further relates to lawnmower (2) comprising a cutting assembly (1)

Description

Lawnmower Cutting Assembly and Lawnmower TECHNICAL FIELD The present disclosure relates to lawnmower cutting assembly. The present disclosure further relates to a lawnmower comprising a cutting assembly.

BACKGROUND Various types of lawnmowers exist on today's market. Examples are walk-behind mowersand self-propelled robotic lawnmowers. A walk-behind mower is a lawnmower usuallycomprising an elongated handle allowing a user to push, and/or to guide, the lawnmower.Some walk-behind mowers comprise a propulsion arrangement configured to drive one ormore wheels of the lawnmower. Walk-behind mowers lacking a propulsion arrangement aresometimes referred to as “push mowers”. Some lawnmowers comprise a power unit in theform of an electric motor configured to rotate the cutting unit and some lawnmowerscomprise a power unit in the form of a combustion engine configured to rotate the cutting unit.

A self-propelled robotic lawnmower is a mower capable of cutting grass in areas in anautonomous manner. Some robotic lawnmowers require a user to set up a border wirearound a lawn that defines the area to be mowed. Such robotic lawnmowers use a sensor tolocate the wire and thereby the boundary of the area to be trimmed. ln addition to the wire,robotic lawnmowers may also comprise other types of positioning units and sensors, forexample sensors for detecting an event, such as a collision with an object within the area.The robotic lawnmower may move in a systematic and/or random pattern to ensure that thearea is completely cut. ln some cases, the robotic lawnmower uses the wire to locate arecharging dock used to recharge the one or more batteries. Generally, robotic lawnmowersoperate unattended within the area in which they operate. Examples of such areas are lawns, gardens, parks, sports fields, golf courts and the like.

Many lawnmowers comprise hight adjustment mechanism for adjusting a cutting hight of thelawnmower. The cutting hight is adjusted by in some way changing the relative distancebetween ground engaging portions of wheels of the lawnmower and a cutting plane of thecutting unit. Thereby, when the lawnmower is moving over a ground surface, the cutting unit will cut vegetation to a certain selected hight.

Some lawnmowers comprise arrangements allowing a user to change the position of the wheels relative to a lawnmower body of the lawnmower, wherein the power unit assembly is 2 rigidly attached to the lawnmower body. Such solutions either requires one hight adjustmentmechanism per wheel or a hight adjustment mechanism capable of changing the relativepositions of all wheels of the lawnmower relative to the lawnmower body using one actuator,such as a lever. Solutions comprising one hight adjustment mechanism per wheel areburdensome and time-consuming to use because a user is required to adjust all wheelsindividually to a certain position relative to the lawnmower body. Solutions comprising onehight adjustment mechanism capable of changing the relative positions of all wheels usingone actuator are simpler and less time-consuming to use. However, they add costs,complexity, and weight to the lawnmower because of the connections needed bet\Neen the actuator and individual hight adjustment mechanisms at the wheels.

Some other lawnmowers comprise arrangements allowing a user to change the position ofthe entire power unit assembly, which includes the power unit and the cutting unit, relative tothe lawnmower body of the lawnmower. Such solutions circumvent the need for changing therelative positions of the wheels of the lawnmower relative to the lawnmower body. Some ofthese solutions are mechanical solutions allowing a user to change the position of the entirepower unit assembly relative to the lawnmower body for example by turning an actuator,such as a knob or lever. Some other of these solutions are electromechanical solutionsallowing a user to change the position of the entire power unit assembly relative to thelawnmower body by interacting with an interface such as one or more buttons, switches,displays, or the like. As understood from the above, these types of arrangements foradjusting the cutting hight add costs, complexity, and weight to the lawnmower because ofcomponents and arrangements needed. ln addition, these types of arrangements foradjusting the cutting hight also add costs, complexity, and weight to the lawnmower becauseof a number of seals, gaskets, and/or bellows needed for protecting the power unit assembly of the lawnmower.

Generally, on today's consumer market, it is an advantage if products, such as lawnmowersand their associated components, systems, and arrangements, comprise different featuresand functions while the products have conditions and/or characteristics suitable for being manufactured and assembled in a cost-efficient manner.

Furthermore, it is an advantage if a lawnmower and its associated components, systems, and arrangements can be used in a simple and intuitive manner.

SUMMARY 3 lt is an object of the present invention to overcome, or at least alleviate, at least some of the above-mentioned problems and drawbacks.

According to a first aspect of the invention, the object is achieved by a lawnmower cuttingassembly comprising a cutting unit, a drive shaft configured to rotate the cutting unit around acommon rotation axis, and a hight adjustment mechanism comprising a first mechanismmember arranged in an interface between the drive shaft and the cutting unit. The firstmechanism member is rotationally arranged relative to the drive shaft to allow or cause achange in the position of the cutting unit relative to the drive shaft in directions coinciding withthe common rotation axis when the first mechanism member is rotated from a first position to a second position relative to the drive shaft.

Thereby, a cutting assembly is provided allowing a user to change the cutting hight of alawnmower comprising the cutting assembly in a simple, quick, and intuitive manner simply by rotating the first mechanism member from the first position to the second position.

Moreover, since the first mechanism member is rotationally arranged relative to the driveshaft to allow or cause a change in the position of the cutting unit relative to the drive shaft,the need for an assembly changing the positions of wheels of a lawnmower is circumventedand the need for an assembly changing the position of the entire power unit assembly relative to the lawnmower body is circumvented.

Thus, due to these features, a simple, low cost, and low weight solution is provided forchanging the cutting height of a lawnmower. ln other words, the cutting assembly providesconditions for reducing weight and manufacturing and assembling costs of lawnmowers whileallowing a user to change the cutting hight of the lawnmower in a simple and intuitive mannef.

Accordingly, a lawnmower cutting assembly is provided overcoming, or at least alleviating, atleast some of the above-mentioned problems and drawbacks. As a result, the above- mentioned object is achieved.

Optionally, the cutting assembly comprises a knob operably connected to the firstmechanism member. Thereby, a cutting assembly is provided allowing a user to change thecutting hight of a lawnmower comprising the cutting assembly in a further simpler, quicker, and more intuitive manner simply by rotating the knob. 4 Optionally, the common rotation axis extends through a centre portion of the knob. Thereby,a cutting assembly is provided allowing a user to locate the knob and change the cutting hight in an even more intuitive manner.

Optionally, the knob is arranged on a side of the cutting unit which faces a ground surfaceduring operation of the cutting assembly. Thereby, a cutting assembly is provided allowing a user to locate the knob and change the cutting hight in an even more intuitive manner.

Optionally, the first mechanism member is rotationally arranged relative to the drive shaftaround a rotation axis coinciding with the common rotation axis. Thereby, conditions areprovided for a simple and efficient connection bet\Neen a knob and the first mechanismmember. Moreover, conditions are provided for a simple, efficient, and reliable hight adjustment mechanism.

Optionally, the hight adjustment mechanism comprises a second mechanism memberconfigured to interact with the first mechanism member to allow or cause a change in theposition of the cutting unit relative to the drive shaft when the first mechanism member isrotated from the first position to the second position. Thereby, conditions are provided for a simple, efficient, and reliable hight adjustment mechanism.

Optionally, the second mechanism member encloses at least part of the first mechanismmember. Thereby, conditions are provided for a simple, efficient, and reliable hightadjustment mechanism. Moreover, conditions are provided for a protection of the firstmechanism member and the interface between first and second mechanism members by thesecond mechanism member thereby providing conditions for preventing dirt and cutting residues from reaching active parts of the first and second mechanism members.

Optionally, the second mechanism member is stationary arranged relative to the cutting unit.Thereby, conditions are provided for a simple, efficient, and reliable hight adjustment mechanism.

Optionally, the second mechanism member forms part of the cutting unit. Thereby, conditionsare provided for a simple, efficient, and reliable hight adjustment mechanism. Moreoverconditions are provided for a cutting assembly having a low weight and conditions and characteristic suitable for being manufactured and assembled in a cost-efficient manner.

Optionally, the cutting assembly comprises a spring configured to bias the secondmechanism member in a direction towards the first mechanism member. Thereby, an abutting contact between the first and second mechanism members can be ensured.

Optionally, the second mechanism member comprises a guide surface being inc|ined relativeto a plane perpendicular to the common rotation axis, and wherein a portion of the firstmechanism member is configured to abut against the guide surface. Thereby, a hightadjustment mechanism is provided having conditions for adjusting the cutting height of alawnmower comprising the hight adjustment mechanism in a simple, efficient, and reliable mannef.

Optionally, each of the first and second mechanism members comprises threads, whereinthe guide surface of the second mechanism member is a surface of the threads of thesecond mechanism member, and wherein the portion of the first mechanism member is aportion of the threads of the first mechanism member. Thereby, a hight adjustmentmechanism is provided having conditions for adjusting the cutting height of a lawnmowercomprising the hight adjustment mechanism in a simple, efficient, and reliable manner.Moreover, a hight adjustment mechanism is provided in which the threads of the first and second mechanism members may provide a reliable lock of the cutting hight.

Optionally, the first mechanism member comprises radially outer threads and the secondmechanism member comprises radially inner threads. Thereby, a simple, efficient, andreliable hight adjustment mechanism is provided having conditions and characteristics suitable for being manufactured and assembled in a cost-efficient manner.

Optionally, the second mechanism member comprises a cam surface and the firstmechanism member comprises a follower, wherein the guide surface is a surface of the camsurface, and wherein the portion of the first mechanism member is a portion of the follower.Thereby, a cutting assembly is provided allowing a user to change the cutting hight of in asimple, quick, and intuitive manner. Moreover, a cutting assembly is provided havingconditions for allowing a user to select between one or more predetermined cutting hights in an intuitive manner.

Optionally, the cam surface comprises a first notch and a second notch, and wherein thefollower is positioned in the first notch when the first mechanism member is rotated to the firstposition and is positioned in the second notch when the first mechanism member is rotated to the second position. Thereby, a cutting assembly is provided allowing a user to change the 6 cutting hight of in a simple, quick, and intuitive manner. Moreover, a cutting assembly isprovided having conditions for allowing a user to select between one or more predetermined cutting hights in an intuitive manner.

Optionally, the cutting unit is configured to assume a first position relative to the drive shaftwhen the first mechanism member is in the first position and is configured to assume asecond position relative to the drive shaft when the first mechanism member is in the secondposition. Thereby, a cutting assembly is provided allowing a user to change the cutting hight in a simple, intuitive, and efficient manner.

Optionally, the first mechanism member is locked from moving relative to the drive shaft indirections coinciding with the common rotation axis. Thereby, conditions are provided for asimple, efficient, and reliable hight adjustment mechanism having conditions and characteristics suitable for being manufactured and assembled in a cost-efficient manner.

Optionally, the first position is a locking position in which the first mechanism member locksthe cutting unit from moving relative to the drive shaft, and wherein the second position is anunlocking position in which the first mechanism member unlocks the cutting unit from thedrive shaft to allow a change in the position of the cutting unit relative to the drive shaft indirections coinciding with the common rotation axis. Thereby, a cutting assembly is providedallowing a user to change the position of the cutting unit relative to the drive shaft simply bymoving the first mechanism member to the second position and move the cutting unit relativeto the drive shaft. Moreover, a cutting assembly is provided allowing a user to lock the cuttingunit relative to the drive shaft simply by moving the first mechanism member to the firstposition. Thus, a simple, efficient, and intuitive hight adjustment mechanism is provided.Furthermore, a hight adjustment mechanism is provided having conditions and characteristics suitable for being manufactured and assembled in a cost-efficient manner.

Optionally, the first mechanism member is configured to move in a direction towards thesecond mechanism member when the first mechanism member is rotated from the secondposition towards the first position. Thereby, conditions are provided for a simple, efficient,and reliable hight adjustment mechanism. Moreover, conditions are provided for a securelocking of the position of the cutting unit relative to the drive shaft when the first mechanism member is rotated to the first position.

Optionally, each of the first and second mechanism members comprises a frusto-conical section, and wherein the frusto-conical section of the first mechanism member is configured 7 to engage with the frusto-conical section of the second mechanism member at least whenthe first mechanism member is rotated from the second position towards the first position.Thereby, conditions are provided for a further secure locking of the position of the cutting unit relative to the drive shaft when the first mechanism member is rotated to the first position.

Optionally, the frusto-conical section of the first mechanism member at least partiallyenc|oses the frusto-conical section of the second mechanism member. Thereby, conditionsare provided for a further secure locking of the position of the cutting unit relative to the driveshaft when the first mechanism member is rotated to the first position. Moreover, a cuttingassembly is provided having conditions and characteristics suitable for being manufactured and assembled in a cost-efficient manner.

Optionally, the first mechanism member is configured to lock the cutting unit relative to thedrive shaft by clamping a portion of the second mechanism member against the drive shaft.Thereby, conditions are provided for a further secure locking of the position of the cutting unitrelative to the drive shaft when the first mechanism member is rotated to the first position.Moreover, a cutting assembly is provided having conditions and characteristics suitable for being manufactured and assembled in a cost-efficient manner.

Optionally, the cutting unit comprises a cutting disc and a number of cutting memberspivotally arranged at a periphery of the cutting disc. Thereby, an energy efficient cuttingassembly is provided. Moreover, a safer cutting assembly is provided because the cuttingmembers may pivot upon impact with an object. Furthermore, the operational reliability of thecutting arrangement is improved. This because if the cutting unit is hitting a hard object, suchas a stone, the cutting unit is less likely to become damaged than if the cutting unit had another type of shape.

Optionally, the cutting unit is arranged such that a kinetic energy of each cutting member isbelow 90 Joules, or is below 2 Joules, during operation of the cutting unit. Thereby, anefficient cutting is provided, while safety during operation of the cutting arrangement is further ensured.

According to a second aspect of the invention, the object is achieved by a lawnmower comprising a cutting assembly according to some embodiments of the present disclosure. 8 Thereby, a lawnmower is provided allowing a user to change the cutting hight in a simple,quick, and intuitive manner simply by rotating the first mechanism member of the cutting assembly from the first position to the second position.

Moreover, since the first mechanism member of the cutting assembly is rotationally arrangedrelative to the drive shaft to allow or cause a change in the position of the cutting unit relativeto the drive shaft, the need for an assembly changing the positions of wheels of the lawnmower is circumvented and the need for an assembly changing the position of the entire power unit assembly relative to the lawnmower body of the lawnmower is circumvented.

Thus, due to these features, a simple, low cost, and low weight solution is provided forchanging the cutting height of the lawnmower. ln other words, a lawnmower is providedhaving conditions for a low weight and conditions and characteristics suitable for beingmanufactured and assembled in a cost-efficient manner while allowing a user to change the cutting hight of the lawnmower in a simple and intuitive manner.

Accordingly, a lawnmower is provided overcoming, or at least alleviating, at least some of theabove-mentioned problems and drawbacks. As a result, the above-mentioned object is achieved.

Optionally, the lawnmower comprises a motor configured to rotate the drive shaft of thecutting assembly, and wherein the motor comprises an output shaft having a rotation axiscoinciding with a rotation axis of the drive shaft. Thereby, a simple, low cost, and low weightlawnmower can be provided allowing a user to change the cutting hight of the lawnmower in a simple and intuitive manner.

Optionally, the output shaft is directly connected to the drive shaft of the cutting assembly, orwherein the drive shaft of the cutting assembly is the output shaft of the motor. Thereby, asimple, low cost, and low weight lawnmower can be provided allowing a user to change the cutting hight of the lawnmower in a simple and intuitive manner.

Optionally, the motor is an electric motor. Thereby, an environmentally-friendly lawnmower is provided capable of generating a low amount of noise and vibration during operation.

Optionally, the lawnmower is a self-propelled autonomous robotic lawnmower. Thereby, a robotic lawnmower is provided allowing a user to change the cutting hight in a simple, quick, 9 and intuitive manner simply by rotating the first mechanism member of the cutting assembly from the first position to the second position.

Thus, a simple, low cost, and low weight solution is provided for changing the cutting heightof the robotic lawnmower. ln other words, a robotic lawnmower is provided having conditionsfor a low weight and conditions and characteristics suitable for being manufactured andassembled in a cost-efficient manner while allowing a user to change the cutting hight of the robotic lawnmower in a simple and intuitive manner.

Further features of, and advantages with, the present invention will become apparent when studying the appended claims and the following detailed description.

BRIEF DESCRIPTION OF THE DRAWINGSVarious aspects of the invention, including its particular features and advantages, will bereadily understood from the example embodiments discussed in the following detailed description and the accompanying drawings, in which: Fig. 1 schematically illustrates a lawnmower according to some embodiments of the presentdisclosure, Fig. 2 illustrates a first cross section of a cutting assembly according to some firstembodiments of the present disclosure, Fig. 3 illustrates a second cross section of the cutting assembly according to the firstembodiments illustrated in Fig. 2, Fig. 4 illustrates an exploded view of the cutting assembly according to the first embodimentsillustrated in Fig. 2 and Fig. 3, Fig. 5 illustrates an exploded view of a cutting assembly according to some secondembodiments of the present disclosure, Fig. 6 illustrates the cutting assembly according to the second embodiments illustrated in Fig.

Fig. 7 illustrates a perspective view of a knob of the cutting assembly illustrated in Fig. 5 andFig. 6, Fig. 8 illustrates a perspective view of a first mechanism member according to theembodiments illustrated in Fig. 5 and Fig. 6, Fig. 9 illustrates a cross section of a cutting unit of the cutting assembly according to theembodiments explained with reference to Fig. 5 - Fig. 8, Fig. 10 illustrates a cross section of the cutting assembly according to the embodiments explained with reference to Fig. 5 - Fig. 9, Fig. 11 illustrates the cross section of the cutting assembly illustrated in Fig. 10, wherein afirst mechanism member is in a second position relative to the drive shaft, Fig. 12 illustrates an exploded view of a cutting assembly according to some thirdembodiments of the present disclosure, Fig. 13 illustrates the cutting assembly according to the embodiments illustrated in Fig. 12 inan assembled state, Fig. 14 illustrates the cutting assembly illustrated in Fig. 13 where a first mechanism memberhas been rotated to a second position, Fig. 15 illustrates the cutting assembly illustrated in Fig. 14 where a cutting unit has beenmoved to a second position relative to the drive shaft, and Fig. 16 schematically illustrates a cutting unit according to some embodiments of the cutting assembly according to the present disclosure.

DETAILED DESCRIPTIONAspects of the present invention will now be described more fully. Like numbers refer to likeelements throughout. Well-known functions or constructions will not necessarily be described in detail for brevity and/or clarity.

Fig. 1 schematically illustrates a lawnmower 2 according to some embodiments of thepresent disclosure. According to the illustrated embodiments, the lawnmower 2 is a self-propelled autonomous robotic lawnmower 2 capable of navigating and cutting grass in anautonomous manner in an area without the intervention or the control of a user. For reasonsof brevity and clarity, the self-propelled autonomous robotic lawnmower 2 is in some placesherein referred to as “the robotic lawnmower 2” or simply the “lawnmower 2”. According tofurther embodiments, the lawnmower 2 may be another type of lawnmower, such as a walk-behind mower or a push mower. According to the embodiments herein, the lawnmower 2 is asmall or mid-sized lawnmower 2 configured to be used to cut grass in areas used foraesthetic and recreational purposes, such as gardens, parks, city parks, sports fields, lawns around houses, apartments, commercial buildings, offices, and the like.

The lawnmower 2 comprises a lawnmower body 16 and a number of lawnmower supportmembers 6, 6' each configured to abut against a ground surface 8 in a first plane P1 duringoperation of the lawnmower 2 to support the lawnmower body 16. The lawnmower body 16,as referred to herein, may also be referred to as a lawnmower chassis. Accordingly, the firstplane P1 will extend along a ground surface 8 when the lawnmower 2 is positioned on a flatground surface 8. According to the illustrated embodiments, the lawnmower support members 6, 6' is wheels 6, 6' of the lawnmower 2. According to the illustrated embodiments, 11 the lawnmower 2 comprises four wheels 6, 6', namely two drive wheels 6 and two supportwheels 6'. The drive wheels 6 of the lawnmower 2 may each be powered by an electricalmotor of the lawnmower 2 to provide motive power and/or steering of the lawnmower 2. lnFig. 1, a longitudinal direction ld of the lawnmower 2 is indicated. The longitudinal direction ldof the lawnmower 2 extends in a longitudinal plane LP of the lawnmower 2. The longitudinalplane LP is parallel to the first plane P1. The longitudinal direction ld of the lawnmower 2 isthus parallel to the first plane P1 and thus also to a ground surface 8 when the lawnmower 2is positioned onto a flat ground surface 8. Moreover, the longitudinal direction ld of thelawnmower 2 is parallel to a forward direction fd of travel of the lawnmower 2 as well as a reverse direction rd of travel of the lawnmower 2.

According to the illustrated embodiments, the drive wheels 6 of the lawnmower 2 are non-steered wheels having a fix rolling direction in relation to the lawnmower body 16. Therespective rolling direction of the drive wheels 6 of the lawnmower 2 is substantially parallelto the longitudinal direction ld of the lawnmower 2. According to the illustrated embodiments,the support wheels 6' are non-driven wheels. Moreover, according to the illustratedembodiments, the support wheels 6' can pivot around a respective pivot axis such that therolling direction of the respective support wheel 6' can follow a travel direction of the lawnmower 2.

As understood from the above, when the drive wheels 6, 6' of the lawnmower 2 are rotated atthe same rotational velocity in a forward rotational direction, and no wheel slip is occurring,the lawnmower 2 will move in the fonNard direction fd indicated in Fig. 1. Likewise, when thedrive wheels 6, 6' of the lawnmower 2 are rotated at the same rotational velocity in a reverserotational direction, and no wheel slip is occurring, the lawnmower 2 will move in the reverse direction rd indicated in Fig. 1. The reverse direction rd is opposite to the fonNard direction fd.

According to the illustrated embodiments, the lawnmower 2 may be referred to as a four-wheeled rear wheel driven lawnmower 2. According to further embodiments, the lawnmower2 may be provided with another number of wheels 6, 6', such as three wheels. Moreover,according to further embodiments, the lawnmower 2 may be provided with anotherconfiguration of driven and non-driven wheels, such as a front wheel drive or an all-wheel drive.

According to the illustrated embodiments, the lawnmower 2 comprises a control arrangement21. The control arrangement 21 may be configured to control propulsion of the lawnmower 2, and steer the lawnmower 2, by controlling electrical motors of the lawnmower 2 arranged to 12 drive the drive wheels 6 of the lawnmower 2. According to further embodiments, the controlarrangement 21 may be configured to steer the lawnmower 2 by controlling the angle ofsteered wheels of the lawnmower 2. According to still further embodiments, the roboticlawnmower may be an articulated robotic lawnmower, wherein the control arrangement 21may be configured to steer the robotic lawnmower by controlling the angle betvveen frame portions of the articulated robotic lawnmower.

The control arrangement 21 may be configured to control propulsion of the lawnmower 2,and steer the lawnmower 2, so as to navigate the lawnmower 2 in an area to be operated.The lawnmower 2 may further comprise one or more sensors arranged to sense a magneticfield of a wire, and/or one or more positioning units, and/or one or more sensors arranged todetect an impending or ongoing collision event with an object. ln addition, the lawnmower 2may comprise a communication unit connected to the control arrangement 21. Thecommunication unit may be configured to communicate With a remote communication unit toreceive instructions therefrom and/or to send information thereto. The communication maybe performed wirelessly over a wireless connection such as the internet, or a wireless localarea netvvork (WLAN), or a wireless connection for exchanging data over short distancesusing short-wavelength, i.e. ultra-high frequency (UHF) radio waves in the industrial,scientific, and medical (ISM) band from 2.4 to 2.486 GHz.

The control arrangement 21 may be configured to control propulsion of the lawnmower 2,and steer the lawnmower 2, so as to navigate the lawnmower 2 in a systematic and/orrandom pattern to ensure that an area is completely covered, using input from one or more ofthe above described sensors and/or units. Furthermore, the lawnmower 2 may comprise oneor more batteries arranged to supply electricity to components of the lawnmower 2. As anexample, the one or more batteries may be arranged to supply electricity to electrical motors of the lawnmower 2 by an amount controlled by the control arrangement 21.

The lawnmower 2 comprises a lawnmower cutting assembly 1. For reasons of brevity andclarity, the lawnmower cutting assembly 1 is in some places herein referred to as “the cuttingassembly 1”. The cutting assembly 1 comprises a cutting unit 3 and a drive shaft 5. The driveshaft 5 is configured to rotate the cutting unit 3 around a common rotation axis Ax, i.e. arotation axis Ax shared by the drive shaft 5 and the cutting unit 3. According to the illustratedembodiments, the cutting unit 3 comprises a cutting disc 3' and a number of cutting members28 pivotally arranged at a periphery of the cutting disc 3”. The cutting unit 3 is configured torotate in a cutting plane PC around the common rotation axis Ax. The common rotation axis Ax is perpendicular to the cutting plane PC. According to the illustrated embodiments, the 13 cutting plane PC is substantially parallel to the first plane P1. According to embodimentsherein, an angle between the cutting plane PC and the first plane P1 may be less than 10 degrees or less than 7 degrees.

The lawnmower 2 further comprises a motor 4 configured to rotate the cutting assembly 1 byrotating the drive shaft 5 of the cutting assembly 1. The motor 4 and the cutting assembly 1may together be referred to as a cutting arrangement. According to the illustratedembodiments, the motor 4 is an electric motor 4. The motor 4 comprises an output shaft 5'having a rotation axis AX coinciding with a rotation axis AX of the drive shaft 5, i.e. coincidingwith the common rotation axis Ax. The output shaft 5' may be directly connected to the driveshaft 5 of the cutting assembly 1. As an alternative, the drive shaft 5 of the cutting assembly 1, as referred to herein, may be the same shaft as the output shaft 5' of the motor 4.

Fig. 2 illustrates a first cross section of a cutting assembly 1 according to some firstembodiments of the present disclosure. The lawnmower 2 illustrated in Fig. 1 may comprisea cutting assembly 1 according to the embodiments illustrated in Fig. 2. ln Fig. 2, the cuttingassembly 1 is illustrated as connected to an electric motor 4. The motor 4 may be fixedlyattached to the lawnmower body 16 of the lawnmower 2 illustrated in Fig. 1. The motor 4 isconfigured to rotate the cutting assembly 1 around the common rotation axis Ax by rotatingthe drive shaft 5 of the cutting assembly 1. As can be seen in Fig. 2, the cutting disc 3' of thecutting unit is disc-shaped and comprises a number of holes 55 at a periphery of the cuttingdisc 3'. Each of the holes 55 is configured for attachment of a cutting member, as is further explained herein.

The cutting unit 3 is rotationally locked to the drive shaft 5 but is movably arranged indirections d1, d2 coinciding with the common rotation axis Ax. The drive shaft 5 maycomprise one or more splines extending in directions d1, d2 coinciding with the commonrotation axis Ax, and wherein the cutting unit 3 may comprise one or more sections eachprotruding into a spline of the drive shaft 5. ln this manner, the cutting unit 3 can be slidablyarranged along the drive shaft 5 while being rotationally locked thereto. As an alternative, orin addition, the drive shaft 5 may comprise one or more elongated protrusions extending indirections d1, d2 coinciding with the common rotation axis Ax, and wherein the cutting unit 3may comprise one or more apertures each configured to accommodate an elongatedprotrusion of the drive shaft 5. Also in this manner, the cutting unit 3 can be slidably arranged along the drive shaft 5 while being rotationally locked thereto. 14 The cutting assembly 1 comprises a hight adjustment mechanism 7. The hight adjustmentmechanism 7 comprises a first mechanism member 11 arranged in an interface between thedrive shaft 5 and the cutting unit 3. As is further explained herein, according to theembodiments illustrated in Fig. 2, the first mechanism member 11 is rotationally arrangedrelative to the drive shaft 5 to cause a change in the position of the cutting unit 3 relative tothe drive shaft 5 in a direction d1 coinciding with the common rotation axis AX when the firstmechanism member 11 is rotated from a first position to a second position relative to thedrive shaft 5. ln Fig. 2, the first mechanism member 11 is illustrated in the first position andthe cutting unit 3 is illustrated in a first position relative to the first plane P1, i.e. a plane P1extending along a ground surface when a lawnmower comprising the cutting assembly 1 is positioned on a flat ground surface.

According to the illustrated embodiments, the cutting assembly 1 comprises a knob 9. Theknob 9 is operably connected to the first mechanism member 11. According to the illustratedembodiments, the knob 9 is operably connected to the first mechanism member 11 viaelongated connection elements 41 of the knob 9 extending through through-holes 43 of thefirst mechanism member 11. Thus, according to the illustrated embodiments, the knob 9 isrotationally locked to the first mechanism member 11 via the elongated connection elements41 of the knob 9 extending through the through-holes 43 of the first mechanism member 11.The elongated connection elements 41 extends in directions d1, d2 coinciding with thecommon rotation axis Ax when the cutting assembly 1 is in an assembled state, as illustratedin Fig. 2. The elongated connection elements 41 and through-holes 43 allows a relativemovement between the first mechanism member 11 and the knob 9 and in the directions d1, d2 coinciding with the common rotation axis Ax.

The first mechanism member 11 is axially attached to the drive shaft 5 of the cuttingassembly 1 but can rotate relative to the drive shaft 5. Accordingly, the first mechanismmember 11 is connected to the drive shaft 5 in a manner such that the first mechanismmember 11 cannot move in axial directions of the shaft 5, i.e. in the directions d1, d2coinciding with the common rotation axis AX indicated in Fig. 2, but can rotate relative thedrive shaft 5 around the common rotation axis Ax. ln other words, the first mechanismmember 11 is rotationally arranged relative to the drive shaft 5 around a rotation axis AXcoinciding with the common rotation axis Ax. Moreover, the first mechanism member 11 islocked from moving relative to the drive shaft 5 in directions d1, d2 coinciding with the common rotation axis Ax.

The hight adjustment mechanism 7 comprises a second mechanism member 12. Accordingto the embodiments illustrated in Fig. 2, the second mechanism member 12 is configured tointeract with the first mechanism member 11 to cause a change in the position of the cuttingunit 3 relative to the drive shaft 5 when the first mechanism member 11 is rotated from thefirst position illustrated in Fig. 2 to the second position. The second mechanism member 12is stationary arranged relative to the cutting unit 3. According to the embodiments illustratedin Fig. 2, the second mechanism member 12 forms part of the cutting unit 3. That is,according to the embodiments illustrated in Fig. 2, the second mechanism member 12 is apart of a hight adjustment mechanism housing 45 of the cutting assembly 1. Moreover,according to the embodiments illustrated in Fig. 2, the second mechanism member 12 enc|oses the first mechanism member 11.

The second mechanism member 12 comprises a guide surface 17. The guide surface 17 isinc|ined relative to a p|ane P2 perpendicular to the common rotation axis Ax. According to theillustrated embodiments, the p|ane P2 perpendicular to the common rotation axis AXcoincides with the first p|ane P1 referred to above. A portion 19 of the first mechanismmember 11 is configured to abut against the guide surface 17. Thereby, the first mechanismmember 11 will move relative to the second mechanism member 12 in directions d1, d2coinciding with the common rotation axis AX when the first mechanism member 11 is rotated relative to the second mechanism member 12 around the common rotation axis Ax.

According to the embodiments illustrated in Fig. 2, each of the first and second mechanismmembers 11, 12 comprises threads 23, 24. ln more detail, the first mechanism member 11comprises radia||y outer threads 23 and the second mechanism member 12 comprisesradia||y inner threads 24 engaging with the threads 23 of the first mechanism member 11.Thus, according to the embodiments illustrated in Fig. 2, the guide surface 17 of the secondmechanism member 12 is a surface of the threads 24 of the second mechanism member 12,and the portion 19 of the first mechanism member 11 is a portion 19 of the threads 23 of the first mechanism member 11.

Due to these features, upon rotation of the first mechanism member 11 relative to the secondmechanism member 12 and the drive shaft 5 from the first position illustrated in Fig. 2, thefirst mechanism member 11 moves the cutting unit 3 in the direction d2 indicated in Fig. 2. lnother words, upon rotation of the first mechanism member 11 relative to the secondmechanism member 12, and relative to the drive shaft 5, from the first position illustrated inFig. 2, the first mechanism member 11 Will cause a change in the position of the cutting unit 3 relative to the drive shaft 5. 16 According to the illustrated embodiments, the common rotation axis Ax extends through acentre portion 9' of the knob 9. Moreover, the knob 9 is arranged on a side S1 of the cuttingunit 3 which faces a ground surface during operation of the cutting assembly 1. Thereby, acutting assembly 1 is provided which can be used in a simple and intuitive manner foradjusting the cutting hight of a lawnmower. Moreover, according to the embodimentsillustrated in Fig. 2, the knob 9 is formed as a |id protecting the inner volume of the hightadjustment mechanism housing 45. Due to these features, dirt and cutting residues areprevented from reaching the first and second mechanism members 11, 12 of the cutting assembly 1.

Fig. 3 illustrates a second cross section of the cutting assembly 1 according to the firstembodiments illustrated in Fig. 2. ln Fig. 2, the first mechanism member 11 is illustrated ashaving been rotated from the first position to a second position. As can be seen in Fig. 2, asa result thereof, the cutting unit 3 has moved in the direction d2 indicated in Fig. 2 and Fig. 3from the first position illustrated in Fig. 2 to a second position relative to the drive shaft 5.Since the position of the drive shaft 5 is fix relative to the lawnmower body 16 of thelawnmower 2 illustrated in Fig. 1, the cutting unit 3 will move relative to the ground surface 8 when the first mechanism member 11 is rotated from the first position to the second position.

As described above, according to the first embodiments of the present disclosure, the firstmechanism member 11 and second mechanism member 12 each comprises threads 23, 24.The first and second positions of the first mechanism member 11 is illustrated as being endpositions of the first mechanism member 11. However, since the first mechanism member 11and the second mechanism member 12 each comprises threads 23, 24 according to the firstembodiments of the present disclosure, the first mechanism member 11 can be rotated toany number of positions between the first and second positions. Moreover, the first andsecond positions of the first mechanism member 11 may not be end positions of the firstmechanism member 11. Accordingly, the first embodiments of the cutting assembly 1according to the present disclosure allows a user to perform a stepless adjustment theposition of the cutting unit 3 simply by rotating the first mechanism member 11 via the knob9. The treaded connection betvveen the first and second mechanism members 11, 12, andthe pitch of the treads 23, 24, ensures that the cutting unit 3 stays in place relative to thedrive shaft 5 during operation of the cutting assembly 1 once a position of the cutting unit 3 relative to the drive shaft 5 has been selected/adjusted via the knob 9. 17 Moreover, according to the first embodiments of the cutting assembly 1, one or both of theknob 9 and the cutting unit 3 may comprise numbers, letters, symbols, arrows, and the likeindicating the relative angle between the knob 9 and the cutting unit 3. The numbers, letters,symbols, arrows, and the like may further indicate the rotational direction of the knob 9 whichincreases and/or decreases the cutting hight of the cutting assembly 1. The numbers, letters,symbols, arrows, and the like may be arranged on a side S1 of the knob 9, and/or the cuttingunit 3, which faces a ground surface during operation of the cutting assembly 1. ln thismanner, a user can in a simpler manner identify a current position of the cutting unit 3relative to the drive shaft 5 and/or how the knob 9 can be rotated, i.e. in which direction theknob 9 can be rotated, so as to increase or decrease the cutting hight of the cutting assembly1.

Fig. 4 illustrates an exploded view of the cutting assembly 1 according to the firstembodiments illustrated in Fig. 2 and Fig. 3. ln Fig. 4, the elongated connection elements 41of the knob 9 and the through-holes 43 of the first mechanism member 11 are more clearlyseen. According to the illustrated embodiments, the knob 9 comprises three elongatedconnection elements 41 and the first mechanism member 11 comprises three through-holes43, wherein each elongated connection element 41 is configured to extend through athrough-hole 43 of the first mechanism member 11 when the cutting assembly 1 is in anassembled state as is illustrated in Fig. 2 and Fig. 3. According to further embodiments, theknob 9 and the first mechanism member 11 may comprise another number of elongated connection elements 41 and through-holes 43.

Moreover, as seen in Fig. 4, the cutting disc 3' comprises three holes 55 at a periphery of thecutting disc 3”. Each of the holes 55 is configured for attachment of a cutting member. Thecutting unit 3 illustrated in Fig. 4 is thus configured to comprise three cutting members.However, according to further embodiments, the cutting unit 3 may comprise another number of cutting members.

Fig. 5 illustrates an exploded view of a cutting assembly 1 according to some secondembodiments of the present disclosure. The lawnmower 2 illustrated in Fig. 1 may comprisea cutting assembly 1 according to the embodiments illustrated in Fig. 5. Moreover, Fig. 5illustrates an electric motor 4 comprising an output shaft 5”. The motor 4 may be fixedlyattached to the lawnmower body 16 of the lawnmower 2 illustrated in Fig. 1. The motor 4 isconfigured to rotate the cutting assembly 1 around the common rotation axis Ax by rotatingthe drive shaft 5 of the cutting assembly 1. As can be seen in Fig. 5, the cutting disc 3' of the cutting unit 3 is disc-shaped and comprises a number of cutting members 28 pivotally 18 arranged at a periphery of the cutting disc 3'. ln more detail, the cutting disc 3' of the cuttingunit 3 comprises three cutting members 28 each pivotally arranged at a periphery of thecutting disc 3'. However, according to further embodiments, the cutting unit 3 may comprise another number of cutting members 28.

According to the embodiments illustrated in Fig. 5, the output shaft 5' of the motor 4 and thedrive shaft 5 of the cutting assembly 1 are separate units. However, the drive shaft 5 of thecutting assembly 1, as referred to herein, may be the same shaft as the output shaft 5' of themotor 4. The drive shaft 5 of the cutting assembly 1 may also be referred to as a centre hub.According to the illustrated embodiments, the output shaft 5' of the motor 4 is configured toextend into the drive shaft 5 of the cutting assembly 1 and may be rotationally locked to thedrive shaft 5 of the cutting assembly 1 to transfer torque between the output shaft 5' and thedrive shaft 5 of the cutting assembly 1. When the cutting assembly 1 is in an assembledstate, the cutting unit 3 is rotationally locked to the drive shaft 5 but is movably arranged in directions d1, d2 coinciding with the common rotation axis Ax.

According to the embodiments illustrated in Fig. 5, the drive shaft 5 comprises a number ofsplines 47 extending in directions d1, d2 coinciding with the common rotation axis AX. Thecutting unit 3 comprises a number of protrusions 49 each configured to protrude into a spline47 of the drive shaft 5 when the cutting assembly 1 is in an assembled state. ln this manner,the cutting unit 3 is slidably arranged along the drive shaft 5 while being rotationally lockedthereto when the cutting assembly 1 is in the assembled state. As an alternative, or inaddition, the drive shaft 5 may comprise one or more elongated protrusions extending indirections d1, d2 coinciding with the common rotation axis Ax, and wherein the cutting unit 3may comprise one or more apertures each configured to accommodate an elongatedprotrusion of the drive shaft 5. Also in this manner, the cutting unit 3 can be slidably arranged along the drive shaft 5 while being rotationally locked thereto.

The cutting assembly 1 comprises a hight adjustment mechanism 7. The hight adjustmentmechanism 7 comprises a first mechanism member 11. The first mechanism member 11 isarranged in an interface between the drive shaft 5 and the cutting unit 3 when the cutting assembly 1 is in the assembled state.

Fig. 6 illustrates the cutting assembly 1 according to the second embodiments illustrated inFig. 5 in an assembled state. ln Fig. 6, some components of the cutting assembly 1 areillustrated in a cross section to facilitate understanding of the working principle of the cutting assembly 1. As is further explained herein, according to the embodiments illustrated in Fig. 5 19 and Fig. 6, the first mechanism member 11 is rotationally arranged relative to the drive shaft5 to cause a change in the position of the cutting unit 3 relative to the drive shaft 5 in adirection d1 coinciding with the common rotation axis AX when the first mechanism member11 is rotated from a first position to a second position relative to the drive shaft 5. ln Fig. 6,the first mechanism member 11 is illustrated in the first position and the cutting unit 3 isillustrated in a first position relative to the first p|ane P1, i.e. a p|ane P1 extending along aground surface when a lawnmower comprising the cutting assembly 1 is positioned on a flat ground surface.

According to the embodiments illustrated in Fig. 5 and Fig. 6, the cutting assembly 1comprises a knob 9. The knob 9 is operably connected to the first mechanism member 11.According to the illustrated embodiments, the knob 9 is operably connected to the firstmechanism member 11 via e|ongated connection elements 41 of the knob 9. The e|ongatedconnection elements 41 extends in directions d1, d2 coinciding with the common rotation axis Ax when the cutting assembly 1 is in an assembled state, as illustrated in Fig. 6.

Fig. 7 illustrates a perspective view of the knob 9 of the cutting assembly 1 illustrated in Fig.5 and Fig. 6. The knob 9 comprises a similar design as the knob 9 of the cutting assembly 1according to the embodiments illustrated in Fig. 2 - Fig. 4. However, according to theembodiments illustrated in Fig. 5 - Fig. 7, the knob 9 comprises four e|ongated connectionelements 41. According to further embodiments, the knob 9 may comprise another number of e|ongated connection elements 41.

Fig. 8 illustrates a perspective view of the first mechanism member 11 according to theembodiments illustrated in Fig. 5 and Fig. 6. According to the illustrated embodiments, thefirst mechanism member 11 comprises t\No opposing protrusions 48 protruding radially froma main body 11' of the first mechanism member 11. The protrusions 48 are configured toprotrude into void spaces 41' between two adjacent e|ongated connection elements 41 whenthe cutting assembly 1 is in the assembled state, as is illustrated in Fig. 6. One of the protrusions 48 is also indicated in Fig. 6. ln the following, simultaneous reference is made to Fig. 5 - Fig. 8, if not indicated othenNise.According to these embodiments, the knob 9 is rotationally locked to the first mechanismmember 11 via the e|ongated connection elements 41 of the knob 9 extending into the voidspaces 41' between adjacent protrusions 48. The e|ongated connection elements 41 of theknob 9 are configured to abut against the protrusions 48 of the first mechanism member 11 upon rotation of the knob 9 so as to transfer torque between the knob 9 and the first mechanism member 11. Moreover, the protrusions 48 can slide in the void spaces 41'between adjacent elongated connection elements 41 of the knob 9. Accordingly, theconnection between the knob 9 and the first mechanism member 11 allows a relativemovement between the first mechanism member 11 and the knob 9 in the directions d1, d2 coinciding with the common rotation aXis AX.

The first mechanism member 11 is aXially attached to the drive shaft 5 of the cuttingassembly 1 but can rotate relative to the drive shaft 5. Accordingly, the first mechanismmember 11 is connected to the drive shaft 5 in a manner such that the first mechanismmember 11 cannot move in aXial directions of the shaft 5, i.e. in the directions d1, d2coinciding with the common rotation axis AX indicated in Fig. 6, but can rotate relative thedrive shaft 5 around the common rotation aXis AX. ln other words, the first mechanismmember 11 is rotationally arranged relative to the drive shaft 5 around a rotation axis AXcoinciding with the common rotation aXis AX. Moreover, the first mechanism member 11 islocked from moving relative to the drive shaft 5 in directions d1, d2 coinciding with the common rotation axis AX.

Also in these embodiments, as is indicated in Fig. 5 and Fig. 6, the hight adjustmentmechanism 7 comprises a second mechanism member 12. As is further explained herein,the second mechanism member 12 is configured to interact with the first mechanism member11 to cause a change in the position of the cutting unit 3 relative to the drive shaft 5 when thefirst mechanism member 11 is rotated from the first position illustrated in Fig. 5 to the second position.

Fig. 9 illustrates a cross section of the cutting unit 3 of the cutting assembly 1 according tothe embodiments eXplained with reference to Fig. 5 - Fig. 8, i.e. the second embodimentseXplained herein. ln Fig. 9, the second mechanism member 12 of the cutting assembly 1 canbe seen. Also in these embodiments, the second mechanism member 12 is stationaryarranged relative to the cutting unit 3, because the second mechanism member 12 formspart of the cutting unit 3. That is, according to the embodiments illustrated in Fig. 9, thesecond mechanism member 12 is a part of a hight adjustment mechanism housing 45 of thecutting assembly. Moreover, also in the embodiments illustrated in Fig. 5 - Fig. 9, the secondmechanism member 12 encloses the first mechanism member 11 when the cutting assembly 1 is in the assembled state.

The second mechanism member 12 comprises a guide surface 17. The guide surface 17 is inclined relative to a plane P2 perpendicular to the common rotation axis AX. According to the 21 illustrated embodiments, the plane P2 perpendicular to the common rotation axis Axcoincides with the first plane P1 referred to above. ln more detail, according to theembodiments illustrated in Fig. 9, the second mechanism member 12 comprises a cam surface 25, and wherein the guide surface 17 is a surface of the cam surface 25.

The following is explained with simultaneous reference to Fig. 5 - Fig. 9, if not indicatedothenNise. A portion 19 of the first mechanism member 11 is configured to abut against theguide surface 17 when the cutting assembly 1 is in the assembled state. As is indicated inFig. 5 and Fig. 8, the first mechanism member 11 comprises a follower 27, wherein the portion 19 of the first mechanism member 11 is a portion 19 of the follower 27.

Fig. 10 illustrates a cross section of the cutting assembly 1 according to the embodimentsexplained with reference to Fig. 5 - Fig. 9 in an assembled state. ln Fig. 10, the firstmechanism member 11 is in the first position relative to the drive shaft 5. As can be seen inFig. 10, the cam surface 25 of the second mechanism member 12 comprises a first notch 31.The follower 27 is positioned in the first notch 31 when the first mechanism member 11 is in the first position.

Fig. 11 illustrates the cross section of the cutting assembly 1 illustrated in Fig. 10, whereinthe first mechanism member 11 is in the second position relative to the drive shaft 5. Uponrotation of the first mechanism member 11 from the first position illustrated in Fig. 10, theabutting contact betvveen the follower 27 and the cam surface 25 forces the cutting unit 3 tomove in the direction d2 indicated in Fig. 10 and Fig. 11. As illustrated in Fig. 11, the camsurface 25 comprises a second notch 33, and wherein the follower 27 is positioned in the second notch 33 when the first mechanism member 11 is rotated to the second position.

According to these embodiments, the cutting assembly 1 comprises a spring 15 configured tobias the second mechanism member 12 in a direction d1 towards the first mechanismmember 11. Since the second mechanism member 12 form part of the cutting unit 3according to the illustrated embodiments, the spring 15 is configured to bias the cutting unit 3in the direction d1 towards the first mechanism member 11 according to the illustratedembodiments. Due to the biasing force of the spring 15, an abutting contact between the firstand second mechanism members can be ensured. Moreover, the follower 27 can be moresecurely retained in notches 31, 32, 33 of the cam surface 25. As understood from the hereindescribed, and as can be seen when comparing Fig. 10 and Fig. 11, the spring 15 iscompressed upon rotation of the first mechanism member 11 from the first position towards the second position. According to the illustrated embodiments, the spring 15 is a coil spring 22 arranged around the drive shaft 5. Thereby, a compact and reliable cutting assembly 1 isprovided. However, according to further embodiments, the spring 15 may be another type ofspring than a coil-spring and may be arranged at another location than around the drive shaft As can be seen in Fig. 9, according to the illustrated embodiments, the cam surface 25comprises a third notch 32. The third notch 32 is arranged between the first and secondnotches 31, 33. The follower 27 is positioned in the third notch 32 when the first mechanismmember 11 is in a position between the first and second positions. The first and secondpositions of the first mechanism member 11 thus constitutes end positions of the firstmechanism member 11, whereas the first mechanism member 11 can be rotated to a thirdposition between the first and second positions so as to obtain a third position of the cuttingunit 3 relative to the drive shaft 5. However, the first and second positions, as referred toherein, may not be end positions. Moreover, according to further embodiments, the camsurface 25 may comprise another number of notches 31, 32, 33 than three, such as two, four, five, six, or the like.

As indicated in Fig. 6, the common rotation axis Ax extends through a centre portion 9' of theknob 9. Moreover, the knob 9 is arranged on a side S1 of the cutting unit 3 which faces aground surface during operation of the cutting assembly 1. Thereby, a cutting assembly 1 isprovided which can be used in a simple and intuitive manner for adjusting the cutting hight ofa lawnmower. Moreover, according to these embodiments, the knob 9 is formed as a lidprotecting the inner volume of the hight adjustment mechanism housing 45. Due to thesefeatures, dirt and cutting residues are prevented from reaching the first and second mechanism members 11, 12.

As explained above, according to the first embodiments of the cutting assembly 1 explainedwith reference to Fig. 2 - Fig. 4, as well as according to the second embodiments of thecutting assembly 1 explained with reference to Fig. 5 - Fig. 11, the cutting unit 3 isrotationally locked to the drive shaft 5 and the knob 9 is rotationally locked to the firstmechanism member 11 when the cutting assembly 1 is in the assembled state. Accordingly,a rotation of the first mechanism member 11 relative to the drive shaft 5 can be obtained by rotating the knob 9 relative to the cutting unit 3.

Due to the follower 27 and the number of notches 31, 32, 33 in the second embodiments ofthe cutting assembly 1 explained with reference to Fig. 5 - Fig. 11, a cutting assembly 1 is provided allowing a user to select between different predetermined cutting hights wherein the 23 user may obtain a tactile input when the knob 9 is rotated to a position relative to the cuttingunit 3 in which the follower 27 of the first mechanism member 11 reaches a notch 31, 32, 33.Thereby, the user can identify when the knob 9 has been rotated to an angle relative to the cutting unit 3 in which a new cutting hight of the cutting unit 3 has been selected.

Moreover, according to the second embodiments of the cutting assembly 1 explained withreference to Fig. 5 - Fig. 11, one or both of the knob 9 and the cutting unit 3 may comprisenumbers, letters, symbols, arrows, and the like indicating the relative angle between the knob9 and the cutting unit 3. The numbers, letters, symbols, arrows, and the like may furtherindicate the rotational direction of the knob 9 which increases and/or decreases the cuttinghight of the cutting assembly 1. The numbers, letters, symbols, arrows, and the like may bearranged on a side S1 of the knob 9, and/or the cutting unit 3, which faces a ground surfaceduring operation of the cutting assembly 1. ln this manner, a user can in a simpler manneridentify a current position of the cutting unit 3 relative to the drive shaft 5 and/or how the knob9 can be rotated, i.e. in which direction the knob 9 can be rotated, so as to increase or decrease the cutting hight of the cutting assembly 1.

As understood from the above, according to the first embodiments of the cutting assembly 1explained with reference to Fig. 2 - Fig. 4, as well as according to the second embodimentsof the cutting assembly 1 explained with reference to Fig. 5 - Fig. 11, the cutting unit 3 isconfigured to assume a first position relative to the drive shaft 5 when the first mechanismmember 11 is in the first position and is configured to assume a second position relative to the drive shaft 5 when the first mechanism member 11 is in the second position.

Fig. 12 illustrates an exploded view of a cutting assembly 1 according to some thirdembodiments of the present disclosure. The lawnmower 2 illustrated in Fig. 1 may comprisea cutting assembly 1 according to the embodiments illustrated in Fig. 12. ln Fig. 12, some ofthe components of the cutting assembly 1 are illustrated in a cross section to facilitate understanding of the working principle of the cutting assembly 1.

Fig. 12 illustrates an electric motor 4 comprising an output shaft 5”. The motor 4 may befixedly attached to the lawnmower body 16 of the lawnmower 2 illustrated in Fig. 1. Themotor 4 is configured to rotate the cutting assembly 1 around the common rotation axis Ax byrotating the drive shaft 5 of the cutting assembly 1. According to the embodiments illustratedin Fig. 12, the output shaft 5' of the motor 4 and the drive shaft 5 of the cutting assembly 1are separate units. However, the drive shaft 5 of the cutting assembly 1, as referred to herein, may be the same shaft as the output shaft 5' of the motor 4. The drive shaft 5 of the 24 cutting assembly 1 may also be referred to as a centre hub. According to the illustratedembodiments, the output shaft 5' of the motor 4 extends into the drive shaft 5 of the cuttingassembly 1 and is rotationally locked to the drive shaft 5 of the cutting assembly 1 to transfer torque betvveen the output shaft 5' and the drive shaft 5 of the cutting assembly 1.

As can be seen in Fig. 12, the cutting disc 3' of the cutting unit 3 is disc-shaped andcomprises a number of holes 55 at a periphery of the cutting disc 3”. Each of the holes 55 isconfigured for attachment of a cutting member, such as a cutting member 28 illustrated inFig. 5.

The cutting assembly 1 comprises a hight adjustment mechanism 7. The hight adjustmentmechanism 7 comprises a first mechanism member 11. The first mechanism member 11 isarranged in an interface between the drive shaft 5 and the cutting unit 3 when the cuttingassembly 1 is in the assembled state. The hight adjustment mechanism 7 further comprisesa second mechanism member 12. According to the embodiments illustrated in Fig. 12, thesecond mechanism member 12 is configured to interact with the first mechanism member 11to allow a change in the position of the cutting unit 3 relative to the drive shaft 5 when the firstmechanism member 11 is rotated from a first position to a second position, as is furtherexplained herein. The second mechanism member 12 is stationary arranged relative to thecutting unit 3. According to the embodiments illustrated in Fig. 12, the second mechanismmember 12 forms part of the cutting unit 3. That is, according to the embodiments illustratedin Fig. 12, the second mechanism member 12 is a part of the cutting unit 3. Moreover,according to the embodiments illustrated in Fig. 12, the second mechanism member 12encloses the first mechanism member 11 when the cutting assembly 1 is in an assembled state.

The first mechanism member 11 comprises threads 57 configured to engage with threads 59of the second mechanism member 12. According to the illustrated embodiments, the firstmechanism member 11 comprises radially outer threads 57 and the second mechanismmember 12 comprises radially inner threads 59. The cutting assembly 1 comprises a knob 9.According to the illustrated embodiments, the knob 9 is rotationally locked to the firstmechanism member 11 via a connection plate 61 when the cutting assembly 1 is in theassembled state. The connection plate 61 comprises a number of tabs 63. ln Fig. 12, thetabs 63 are illustrated as aligned with the connection plate 61. However, some of the tabs 63are configured to be bent to extend at least partially in the direction d2 indicated in Fig. 12such that they extend into apertures 65 of the first mechanism member 11 when the cutting assembly 1 is in the assembled state. Likewise, some other of the tabs 63 are configured to be bent extend at least partially in the direction d1 indicated in Fig. 12 such that they extendinto apertures 67 of the knob 9 When the cutting assembly 1 is in the assembled state. ln thismanner, the connection plate 61 rotationally locks the knob 9 to the first mechanism member11.

However, according to further embodiments, the cutting assembly 1 may comprise anothertype of arrangement or structure for rotationally locking the knob 9 to the first mechanismmember 11, such as a knob 9 comprising elongated connection elements 41 as theembodiments of the cutting assembly 1 explained with reference to Fig. 2 - Fig. 11. Likewise,the first embodiments of the cutting assembly 1 explained with reference to Fig. 2 - Fig. 4, aswell as according to the second embodiments of the cutting assembly 1 explained withreference to Fig. 5 - Fig. 11, may comprise another type of arrangement or structure forrotationally connecting the knob 9 to the first mechanism member 11, such as a connection plate 61 according to the embodiments illustrated in Fig. 12.

Fig. 13 illustrates the cutting assembly 1 according to the embodiments illustrated in Fig. 12in an assembled state. ln Fig. 13, some of the components of the cutting assembly 1 areillustrated in a cross section to facilitate understanding of the working principle of the cutting assembly 1 _ As is further explained herein, according to the embodiments illustrated in Fig. 12 and Fig.13, the first mechanism member 11 is rotationally arranged relative to the drive shaft 5 toallow a change in the position of the cutting unit 3 relative to the drive shaft 5 in directions d1,d2 coinciding with the common rotation axis Ax when the first mechanism member 11 is rotated from a first position to a second position relative to the drive shaft 5. ln Fig. 13, the first mechanism member 11 is illustrated in the first position whereas thecutting unit 3 is illustrated in a second position relative to the drive shaft 5. As mentionedabove, the first mechanism member 11 comprises threads 57 configured to engage withthreads 59 of the second mechanism member 12. The second mechanism member 12 canthus be said to comprise a guide surface 17, wherein the guide surface 17 is inclined relativeto a plane P2 perpendicular to the common rotation axis Ax. According to the illustratedembodiments, the plane P2 perpendicular to the common rotation axis Ax coincides with thefirst plane P1 referred to above. A portion 19 of the first mechanism member 11, i.e. a portion19 of the threads 57 of the first mechanism member 11, is configured to abut against theguide surface 17. Due to these features, the first mechanism member 11 will move relative to the second mechanism member 12 in directions d1, d2 coinciding with the common rotation 26 axis Ax when the first mechanism member 11 is rotated relative to the second mechanism member 12 around the common rotation axis Ax.

According to the embodiments illustrated in Fig. 12 and Fig. 13, the first position is a lockingposition in which the first mechanism member 11 locks the cutting unit 3 from moving relativeto the drive shaft 5. As indicated in Fig. 12 and Fig. 13, each of the first and secondmechanism members 11, 12 comprises a frusto-conical section 35, 37. As best seen in Fig.13, the frusto-conical section 35 of the first mechanism member 11 is configured to engagewith the frusto-conical section 37 of the second mechanism member 12 when the firstmechanism member 11 is in the first position. According to the illustrated embodiments, thefrusto-conical section 35 of the first mechanism member 11 at least partially enc|oses thefrusto-conical section 37 of the second mechanism member 12. The frusto-conical section 37of the second mechanism member 12 is arranged on a portion 39 of the second mechanismmember 12 which can flex to and from the drive shaft 5 of the cutting assembly 1. That is, theportion 39 of the second mechanism member 12 can flex in directions substantially perpendicular to the directions d1, d2 coinciding with the common rotation axis Ax.

According to the embodiments illustrated in Fig. 12 and Fig. 13, the first mechanism member11 is configured to lock the cutting unit 3 relative to the drive shaft 5 by clamping the portion39 of the second mechanism member 12 against the drive shaft 5. That is, when the firstmechanism member 11 is rotated from a second position towards the first position, the firstmechanism member 11 moves in a direction d2 towards the second mechanism member 12and the abutting contact between the frusto-conical sections 35, 37 of the first and secondmechanism members 11, 12 forces the portion 39 of the second mechanism member 12against the drive shaft 5 so as to lock the cutting unit 3 relative to the drive shaft 5. Likewise,when the first mechanism member 11 is rotated from the first position towards the secondposition, the first mechanism member 11 moves in a direction d1 away from the secondmechanism member 12 and the abutting contact between the frusto-conical sections 35, 37of the first and second mechanism members 11, 12 is released thereby releasing theclamping force of the portion 39 of the second mechanism member 12 against the drive shaft Fig. 14 illustrates the cutting assembly 1 illustrated in Fig. 13 where the first mechanismmember 11 has been rotated to the second position. As can be seen when comparing Fig.13 and Fig. 14, the first mechanism member 11 has moved in the direction d1 away from thesecond mechanism member 12 as a result of the rotation of the first mechanism member 11 from the first position to the second position. Thereby, as explained above, the engaging 27 contact between the between the frusto-conical sections 35, 37 of the first and secondmechanism members 11, 12 is released and as a result thereof, the clamping force of theportion 39 and the drive shaft 5 is released. Thus, according to these embodiments, i.e. theembodiments explained with reference to Fig. 12 - Fig. 14, the second position of the secondmechanism member 12 is an unlocking position in which the first mechanism member 11unlocks the cutting unit 3 from the drive shaft 5. ln this manner, a change in the position ofthe cutting unit 3 relative to the drive shaft 5 in directions d1, d2 coinciding with the commonrotation axis Ax is allowed by rotating the first mechanism member 11 to the second position using the knob 9. ln Fig. 13 and Fig. 14, the connection plate 61 and a tab 63 thereof are indicated. ln Fig. 13and Fig. 14, the tab 63 is illustrated as bent to extend at least partially in the direction d2indicated in Fig. 13 and Fig. 14 such that the tab 63 extend into the aperture 65 of the first mechanism member 11.

Fig. 15 illustrates the cutting assembly 1 illustrated in Fig. 14 where the cutting unit 3 hasbeen moved to a first position relative to the drive shaft 5. As seen in Fig. 15, the first positionis a position in which the cutting unit has been moved further from the motor 4 and thuscloser to a ground surface when a lawnmower comprising the cutting assembly 1 ispositioned onto the ground surface. Thus, when the first mechanism member 11 is rotated tothe second position, a user may manually adjust the position of the cutting unit 3 relative tothe drive shaft 5 so as to adjust the cutting hight. When a wanted position of the cutting unit 3relative to the drive shaft 5 is reached, the user may rotate the first mechanism member 11from the second position to the first position using the knob 9 to lock the cutting unit 3 relativeto the drive shaft 5 at the wanted position. ln the illustrated examples, the first and secondpositions of the cutting unit 3 is illustrated as being end positions of the cutting unit 3.However, a user may select any position between the first and second positions and mayrotate the first mechanism member 11 from the second position to the first position using the knob 9 to lock the cutting unit 3 relative to the drive shaft 5 at that position.

According to the third embodiments of the cutting assembly 1 explained with reference toFig. 12 - Fig. 15, one or both of the knob 9 and the cutting unit 3 may comprise numbers,letters, symbols, arrows, and the like indicating the relative angle between the knob 9 and thecutting unit 3. The numbers, letters, symbols, arrows, and the like may further indicate therotational direction of the knob 9 which locks the cutting unit 3 to the drive shaft 5, and/or therotational direction of the knob 9 which unlocks the cutting unit 3 from the drive shaft 5. The numbers, letters, symbols, arrows, and the like may be arranged on a side S1 of the knob 9, 28 and/or the cutting unit 3, which faces a ground surface during operation of the cuttingassembly 1. ln this manner, a user can in a simpler manner identify a current position of theknob 9 relative to the cutting unit 3, and/or how the knob 9 can be rotated, i.e. in whichdirection the knob 9 can be rotated, so as to lock or unlock the cutting unit 3 to and from thedrive shaft 5.

According to further embodiments of the herein described, the second mechanism member12 may comprise a frusto-conical section which at least partially enc|oses a frusto-conicalsection of the first mechanism member 11. According to such embodiments, the firstmechanism member 11 may be configured to lock the cutting unit 3 relative to the drive shaft by clamping a portion of the first mechanism member 11 against the drive shaft 5.

As can be seen in Fig. 12 - Fig. 15, according to the i||ustrated embodiments, the drive shaftcomprises splines 47. The splines 47 extends in directions d1, d2 coinciding with thecommon rotation axis Ax. The cutting unit 3 comprises a number of protrusions eachconfigured to protrude into a spline 47 of the drive shaft 5 when the cutting assembly 1 is inthe assembled state. ln this manner, the cutting unit 3 can slide along the drive shaft 5 whilebeing rotationally locked thereto regardless of the rotational position of the first mechanismmember 11 relative to the second mechanism member 12. Thus, due to these features, thecutting unit 3 is rotationally locked to the drive shaft 5 regardless of whether the hightadjustment mechanism 7 is in the locked or unlocked state. As an alternative, or in addition,the drive shaft 5 may comprise one or more e|ongated protrusions extending in directions d1,d2 coinciding with the common rotation axis Ax, and wherein the cutting unit 3 may compriseone or more apertures each configured to accommodate an e|ongated protrusion of the driveshaft 5. Also in this manner, the cutting unit 3 can slide along the drive shaft 5 while beingrotationally locked thereto regardless of the rotational position of the first mechanismmember 11 relative to the second mechanism member 12. Due to these features, a more durable and more operational reliable cutting assembly 1 is provided.

The following is explained with simultaneous reference to Fig. 1 - Fig. 15. According to allthe embodiments explained herein, the cutting unit 3 may comprise a cutting disc 3' and anumber of cutting members 28 pivotally arranged at a periphery of the cutting disc 3”.Moreover, according to all the embodiments explained herein, the cutting assembly 1 and themotor 4 may be referred to as a cutting arrangement, wherein the lawnmower 1 i||ustrated in Fig. 1 may comprise such a cutting arrangement, as explained herein. 29 According to some embodiments, the cutting arrangement, i.e. the cutting assembly 1 andthe motor 4, is arranged such that a kinetic energy of each cutting member 28 is below 90Joules, or is below 2 Joules, during operation of the cutting arrangement. According tofurther embodiments, the cutting arrangement is arranged such that a kinetic energy of eachcutting member 28 is within the range of 0.1 Joules and 2 Joules. According to still furtherembodiments, the cutting arrangement is arranged such that a kinetic energy of each cuttingmember 28 is within the range of 0.5 Joules and 70 joules, or is within the range of 5 Joules and 40 joules, or is within the range of 7 Joules and 25 joules.

Fig. 16 schematically illustrates a cutting unit 3 according to some embodiments of thecutting assembly 1 according to the present disclosure. The cutting unit 3 comprises a cuttingdisc 3' and a cutting member 28 arranged at a periphery of the cutting disc 3”. For reasons ofbrevity and clarity, the cutting unit 3 in Fig. 16 is illustrated as comprising only one cuttingmember 28. However, the cutting unit 3 may comprise more than one cutting member 28,such as two, three, four, five, or six cutting members 28. The kinetic energy of each cuttingmember 28 of the cutting unit 3 as described herein may be determined by means of the following formula: Ek=1/2*mv^2 where Ek is the kinetic energy, in Joules; m is the mass, of reckonable length L of the cutting member 28, in kilograms,wherein the reckonable length L of the cutting member 28 may be the length Lbetween the pivot axis 75 of the cutting member 28 and the radially outerportion 72 of a cutting member 28; v is the maximum attainable velocity of the point z which is half\Nay along the reckonable length L of the cutting member 28, in metres per second.

Therefore v=0,1047n[r-L/2] wheren is the maximum rotational speed, in revolutions per minute;r is the distance from the rotational axis Ax of the cutting unit 3 to the radiallyouter portion 72 of a cutting member 28, in metres;L is the reckonable length of the cutting member 28, in metres.

The pivot axis 75 of a cutting member 28 coincides with a centre line of a hole 55 configured for attachment of the cutting member 28 as explained with reference to Fig. 2 and Fig. 12.

According to some embodiments of the cutting arrangement, the distance r from therotational axis Ax of the cutting unit 3 to the radially outer portion 72 of a cutting member 28is within the range of 3 cm to 20 cm, or is within the range of 6 cm to 12 cm, or is approximately 8.5 cm.

According to some embodiments of the cutting unit 3, the reckonable length L of the cuttingmember 28 is within the range of 1 cm to 9 cm, or is within the range of 1.7 cm to 6 cm, or is approximately 3.4 cm.

According to some embodiments of the cutting unit 3, the mass m, of reckonable length L ofthe cutting member 28, is within the range of 1 to 25 grams, or is within the range of 1.7 to 6.5 grams, or is approximately 3.4 grams.

According to some embodiments, the thickness of the cutting member 28, i.e. the thicknessof the cutting member 28 measured in a direction perpendicular to the rotational plane of thecutting member 28, is within the range of 0.2 mm to 3.5 mm, or is within the range of 0.32 mm to 1.2 mm, or is approximately 0.63 mm.

According to some embodiments, the height h of the cutting member 28 of the cutting unit 3is within the range of 0.7 cm to 6 cm, or is within the range of 1 cm to 2.9 cm, or is approximately 1.9 cm.

According to some embodiments of the cutting arrangement, the diameter of the cutting disc3' of the cutting unit 3 is within the range of 5 cm to 39 cm, or is within the range of 8 cm to cm, or is approximately 14.3 cm.

According to some embodiments, the maximum attainable velocity v of the point z which ishalf way along the reckonable length L of the cutting member 28 is within the range of 10 to80 metres per second, or is within the range of 15 to 50 metres per second, or is approximately 34 metres per second.

According to some embodiments, the maximum rotational speed of the cutting unit 3 is withinthe range of 1 000 to 8 500 revolutions per minute, or is within the range of 2 400 to 7 200 revolutions per minute, or is approximately 4 800 revolutions per minute. 31 lt is to be understood that the foregoing is illustrative of various example embodiments andthat the invention is defined only by the appended claims. A person skilled in the art willrealize that the example embodiments may be modified, and that different features of theexample embodiments may be combined to create embodiments other than those describedherein, without departing from the scope of the present invention, as defined by the appended claims.

As used herein, the term "comprising" or "comprises" is open-ended, and includes one ormore stated features, elements, steps, components, or functions but does not prec|ude thepresence or addition of one or more other features, elements, steps, components, functions, or groups thereof.

Claims

1. A lawnmower cutting assembly (1) comprising:- a cutting unit (3),- a drive shaft (5) configured to rotate the cutting unit (3) around a common rotationaxis (Ax), and- a hight adjustment mechanism (7) comprising a first mechanism member (11)arranged in an interface between the drive shaft (5) and the cutting unit (3),wherein the first mechanism member (11) is rotationally arranged relative to the driveshaft (5) to allow or cause a change in the position of the cutting unit (3) relative to thedrive shaft (5) in directions (d1, d2) coinciding with the common rotation axis (Ax) whenthe first mechanism member (11) is rotated from a first position to a second position relative to the drive shaft (5). The cutting assembly (1) according to claim 1, wherein the cutting assembly (1) comprises a knob (9) operably connected to the first mechanism member (11). The cutting assembly (1) according to claim 2, wherein the common rotation axis (Ax) extends through a centre portion (9') of the knob (9). The cutting assembly (1) according to claim 2 or 3, wherein the knob (9) is arranged on aside (S1) of the cutting unit (3) which faces a ground surface (8) during operation of the cutting assembly (1 ). The cutting assembly (1) according to any one of the preceding claims, wherein the firstmechanism member (11) is rotationally arranged relative to the drive shaft (5) around a rotation axis (Ax) coinciding with the common rotation axis (Ax). The cutting assembly (1) according to any one of the preceding claims, wherein the hightadjustment mechanism (7) comprises a second mechanism member (12) configured tointeract with the first mechanism member (11) to allow or cause a change in the positionof the cutting unit (3) relative to the drive shaft (5) when the first mechanism member (11) is rotated from the first position to the second position. The cutting assembly (1) according to claim 6, wherein the second mechanism member (12) encloses at least part of the first mechanism member (11). The cutting assembly (1) according to claim 6 or 7, Wherein the second mechanism member (12) is stationary arranged relative to the cutting unit (3). The cutting assembly (1) according to claim 6 - 8, Wherein the second mechanism member (12) forms part of the cutting unit (3). The cutting assembly (1) according to any one of the claims 6 - 9, Wherein the cuttingassembly (1) comprises a spring (15) configured to bias the second mechanism member (12) in a direction (d1) towards the first mechanism member (11). The cutting assembly (1) according to any one of the claims 6 - 10, Wherein the secondmechanism member (12) comprises a guide surface (17) being inclined relative to aplane (P2) perpendicular to the common rotation axis (AX), and Wherein a portion (19) of the first mechanism member (11) is configured to abut against the guide surface (17). The cutting assembly (1) according to claim 11, Wherein each of the first and secondmechanism members (11, 12) comprises threads (23, 24), Wherein the guide surface(17) of the second mechanism member (12) is a surface of the threads (24) of thesecond mechanism member (12), and Wherein the portion (19) of the first mechanism member (11) is a portion (19) of the threads (23) of the first mechanism member (11). The cutting assembly (1) according to any one of the claims 6 - 12, Wherein the firstmechanism member (11) comprises radially outer threads (23) and the second mechanism member (12) comprises radially inner threads (24). The cutting assembly (1) according to any one of the claims 6 - 11, Wherein the secondmechanism member (12) comprises a cam surface (25) and the first mechanismmember (11) comprises a follower (27), Wherein the guide surface (17) is a surface ofthe cam surface (25), and Wherein the portion (19) of the first mechanism member (11) isa portion (19) of the follower (27). The cutting assembly (1) according to claim 14, Wherein the cam surface (25) comprisesa first notch (31) and a second notch (33), and Wherein the follower (27) is positioned inthe first notch (31 ) when the first mechanism member (11) is rotated to the first positionand is positioned in the second notch (33) when the first mechanism member (11) is rotated to the second position. The cutting assembly (1) according to any one of the preceding claims, wherein thecutting unit (3) is configured to assume a first position relative to the drive shaft (5) whenthe first mechanism member (11) is in the first position and is configured to assume asecond position relative to the drive shaft (5) when the first mechanism member (11) is in the second position. The cutting assembly (1) according to any one of the preceding claims, wherein the firstmechanism member (11) is locked from moving relative to the drive shaft (5) in directions (d1, d2) coinciding with the common rotation axis (Ax). The cutting assembly (1) according to any one of the c|aims 1 - 11, wherein the first position is a locking position in which the first mechanism member (11) locks the cuttingunit (3) from moving relative to the drive shaft (5), and wherein the second position is anunlocking position in which the first mechanism member (11) unlocks the cutting unit (3)from the drive shaft (5) to allow a change in the position of the cutting unit (3) relative to the drive shaft (5) in directions (d1, d2) coinciding with the common rotation axis (Ax). The cutting assembly (1) according to claim 18 and any one of the c|aims 6 - 11, whereinthe first mechanism member (11) is configured to move in a direction (d2) towards thesecond mechanism member (12) when the first mechanism member (11) is rotated from the second position towards the first position. The cutting assembly (1) according to claim 18 or 19 and any one of the c|aims 6 -11,wherein each of the first and second mechanism members (11, 12) comprises a frusto-conical section (35, 37), and wherein the frusto-conical section (35) of the firstmechanism member (11) is configured to engage with the frusto-conical section (37) ofthe second mechanism member (12) at least when the first mechanism member (11) is rotated from the second position towards the first position. The cutting assembly (1) according to claim 20 and any one of the c|aims 6 - 11, whereinthe frusto-conical section (35) of the first mechanism member (11) at least partially encloses the frusto-conical section (37) of the second mechanism member (12). .The cutting assembly (1) according to any one of the c|aims 18 - 21 and any one of the c|aims 6 - 11, wherein the first mechanism member (11) is configured to lock the cuttingunit (3) relative to the drive shaft (5) by clamping a portion (39) of the second mechanism member (12) against the drive shaft (5). The cutting assembly (1) according to any one of the preceding claims, wherein thecutting unit (3) comprises a cutting disc (3') and a number of cutting members (28) pivotally arranged at a periphery of the cutting disc (3'). A lawnmower (2) comprising a cutting assembly (1) according to any one of the preceding claims. The lawnmower (2) according to c|aim 24, wherein the lawnmower (2) comprises amotor (4) configured to rotate the drive shaft (5) of the cutting assembly (1 ), and whereinthe motor (4) comprises an output shaft (5') having a rotation axis (AX) coinciding with a rotation axis (AX) of the drive shaft (5). The lawnmower (2) according to c|aim 25, wherein the output shaft (5') is directlyconnected to the drive shaft (5) of the cutting assembly (1 ), or wherein the drive shaft (5) of the cutting assembly (1) is the output shaft (5') of the motor (4). The lawnmower (2) according to c|aim 25 or 26, wherein the motor (4) is an electric motor. The lawnmower (2) according to any one of the claims 24 - 27, wherein the lawnmower (2) is a self-propelled autonomous robotic lawnmower.