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    • 专利摘要:
    3 2ABSTRACT The present disclosure relates to a grinding head for a floor grindingmachine for grinding floor surfaces of stone or stone-like material. Such agrinding head comprises a lower casing member, comprising a lower supportand an upwardly extending edge portion, and an upper casing member,comprising an upper cover and a downwardly extending edge portion,wherein the upper casing member is joinable to the lower casing member by causing axially distal portions of the edge portions to bear on each other. Drawing to be published: Fig. 2a
    公开号:SE1650787A1
    申请号:SE1650787
    申请日:2016-06-03
    公开日:2017-12-04
    发明作者:Fogelberg Andreas；Gustavsson Daniel；Ottosson Linus；Adolfsson Samuel
    申请人:Htc Sweden Ab；
    IPC主号:
    专利说明:

    GRINDING HEAD FOR FLOOR GRINDING MACHINE AND |/IETHOD OFASSEIVIBLING A GRINDING HEAD. SETTING A BELT TENSIONER.SERVICING, ASSEIVIBLING OR DISASSEIVIBLING A BELT PULLEY FOR AFLOOR GRINDING MACHINE Technical field The present disclosure relates to grinding heads for floor grindingmachines, and in particular to grinding heads for floor grinding machinesadapted for grinding floors of stone or stone-like materials, such as Iimestone,sandstone, marble, slate, granite, concrete or terrazzo.
    BackgroundFloor grinding machines are known and used in polishing or grinding floor surfaces, either with the purpose of producing a level and/or glossy floorsurface, or with the purpose of renovating such a surface which hasdeteriorated due to e.g. wear, or which has been damaged.
    A floor grinding machine for this type of grinding typically comprises amachine frame, which carries a motor that is operatively connected to agrinding head. ln a particular class of floor grinding machines, such a grinding headmay be rotatable relative to the machine frame. The grinding head may carrya plurality of grinding disks, each of which may be rotatable relative to thegrinding head. Such a grinding head is typically referred to as a planetarytype grinding head.
    These floor grinding machines are usually equipped with grindingelements in the form of bonded abrasives, i.e. abrasives in the form of athree-dimensional body comprising abrasive particles and a matrix material,which may be a polymer material or a metallic material. As another option, themachines may be equipped with cutting elements, adapted, for example forremoval of glue, paint, lacquer or other surface treatments from a floor su rface. 2The machine may typically be supported by its grinding head and often also by a pair of wheels, which may be arranged behind the grinding head, asseen in a fon/vard direction of the machine. Optionally, the machine may alsobe supported by one or more further wheels, which may be used to controlthe pressure exerted by the grinding head on the floor.
    The pair of wheels may be driven. Optionally, they may be individuallydrivable, such that a direction of travel of the machine may be controlled.
    The grinding head may comprise a lower supporting member and anupper cover member.
    The grinding head may comprise a plurality of axles extending betweenthe lower and the upper members. There may be a belt pulley associated witheach of the axles. An endless belt may operatively engage some or all of thebelt pulleys.
    One example of a known machine of this type is disclosed inWOO3076131A1. An example of a grinding head for use in such a machine isdisclosed in EPO700327A1. Another example of a grinding head is disclosedin EP135804311.
    While grinding heads as disclosed in the references mentioned abovehave found extensive use, there is a desire to provide a grinding head whichwould simplify the processes of assembling, disassembling, and servicing ofthe grinding head.
    Therefore, there remains a need for an improved grinding head.
    SummaryAn object of the present disclosure is to provide an improved grinding head for a floor grinding machine for grinding floor surfaces of stone or stone-like materials.
    A particular object is to provide a grinding head which is improved interms of the processes of assembling, disassembling and servicing.
    The invention is defined by the appended independent claims, withembodiments being set forth in the appended dependent claims in thefollowing description and in the attached drawings. 3According to a first aspect, there is provided a grinding head for a floor grinding machine for grinding floor surfaces of stone or stone-like material,the grinding head comprising: a lower casing member, comprising a lowersupport and an upwardly extending edge portion, and an upper casingmember, comprising an upper cover and a downwardly extending edgeportion, wherein the upper casing member is joinable to the lower casingmember by causing axially distal portions of the edge portions to bear oneach other.
    As such a grinding head casing may be composed of only twomembers, manufacturing and assembly thereof is facilitated. Service anddisassembly is also facilitated.
    Stone or stone-like materials may have a Knoop hardness of morethan 130, preferably more than 135 or 140, and may thus comprise stone orstone-like materials, such as limestone, sandstone, marble, slate, granite,concrete or terrazzo.
    The upper cover and the downwardly extending edge portion may beformed in one piece.
    For example, the grinding head casing members may be formed bycasting of a metallic material, typically iron or aluminium, or an alloy based oneither thereof.
    The lower support and the upwardly extending edge portion may beformed in one piece.
    The upwardly and downwardly extending edge portions may extendover a height corresponding to about 25-75 °/> of a total height of the grindinghead. Preferably, the heights of the edge portions may be on the order of 60-40 °/-.~, 55-45 °/-.~ or about 50-50 °/-.~.
    The distal portion of the edge portion of one of the casing membersmay comprise an axial support surface and a radially outwardly facing radialsupport surface, and the distal portion of the edge portion of the other casingmember comprises an axial support surface and a radially inwardly facingradial support surface, such that when the casing members are in a joinedstate, the axial support surfaces abut each other and the inwardly facing 4radial support surfaces are positioned radially outside the outwardly facing radial support surfaces.
    Hence, the axial support surfaces may extend about the entirecircumference of the casing members, and be generally annu|ar in shape.The axial support surfaces define the axial final position of the casingmembers when being joined.
    The other casing member may comprise an inwardly inclined bevel, forradially guiding the casing member when joining the casing members.
    The bevel may provide a generally conical surface, which acts as aguide when joining together the casing members.
    One of the casing members may comprise at least one guideprotrusion, extending axially from an axially outermost part of its edge portion,and wherein the other casing member may comprise a recess sized,positioned and adapted for receiving the guide protrusion.
    The guide protrusion or protrusions may be positioned such that thereis only one relative angular orientation at which the casing members may bejoined. l/loreover, the guide protrusion may, but need not, provide an initialpoint of engagement between the casing members.
    According to a second aspect, there is provided a grinding head for afloor grinding machine for grinding floor surfaces of stone or stone-likematerial, the grinding head comprising: a lower casing member, comprising alower support and an upwardly extending edge portion, and an upper casingmember, comprising an upper cover and a downwardly extending edgeportion, a first axle, extending between the upper and lower casing members,and a second axle, extending between the upper and lower casing members,wherein the axles are initially arranged in one of the casing members, suchthat, when the grinding head is assembled through a relative axial movementof the upper and lower casing members towards each other, the axles willengage the other one of the casing members at different relative axialpositions of the casing members.
    The grinding head of this second aspect provides for simplifiedassembly of the grinding head, both in connection with manufacture and service. 5When the casing members are completely axially joined, the axles may be axially fixedly connected to said one of the casing members, and axiallymoveable relative to the other one of the casing members.
    The upper and lower casing members may present a respective firstaxle seat and a respective second axle seat, and wherein a distance betweenthe first axle seats may differ from a distance between the second axle seats.
    The terms “axle seat” should be understood to include any seat forcomponents that extend between the casing members, including, but notlimited to, axles, belt tensioners and belt deflectors.
    Alternatively, or as a supplement, an axial distance between a radialseat guides associated with the first axle may be different from an axialdistance between radial seat guides associated with the second axle. ln particular, an effective axial distance may differ, meaning that thedifference may be between the portions of the seat which provide the finalintended radial position of the respective axle. Hence, guide bevels of therespective seats may be of different length. ln particular, a distance between initial points of engagement of theaxle seats may differ.
    A length of the first axle may differ from a length of the secondaxle.According to a third aspect, there is provided a grinding head for a floorgrinding machine for grinding floor surfaces of stone or stone-like material,the grinding head comprising: a hollow grinding head casing enclosing: adrive axle, at least two belt pulleys associated with a respective grinding disk,a belt running over said belt pulleys and said drive axle, a belt tensioner,comprising a tensioner pulley, which is displaceable by rotation about asetting axis, which is spaced from the tensioner pulley by a pulley lever, thesetting axis being parallel withan axis of rotation of the grinding head, and atensioner setting device, for setting a position of the pulley in said direction byapplication of a torque about the setting axis, wherein the tensioner settingdevice is accessible from outside of the grinding head casing, such that thebelt tensioner can be adjusted while the grinding head is in an assembledstate. 6By providing a belt tensioner that is accessible from the outside, it is possible to facilitate initial setup, as well as subsequent service, of thegrinding head.
    This third aspect can be combined by the other aspects describedherein.
    The grinding head may further comprise a locking device, for lockingthe belt tensioner relative to the grinding head, wherein said locking devicemay be also accessible from the outside of the grinding head casing.
    The locking device may comprise a locking lever, which may be fixedlyconnected to an axle about which the belt tensioner may be rotatable, and alocking fastener, arranged to releasably fasten the locking lever relative to thecasing, such that rotation about the setting axis is prevented.
    A torque connector may be provided coaxially with the setting axis,said torque connector being permanently exposed on an outside of thegrinding head casing.
    The tensioner setting device may be accessible through an opening ina casing member and a sealing device may be arranged between theconnector and an edge of the opening.
    The grinding head may further comprise a lower casing member, andan upper casing member.
    According to a fourth aspect, there is provided a grinding head for afloor grinding machine for grinding floor surfaces of stone or stone-likematerial, the grinding head comprising: a lower casing member, comprising alower support, an upper casing member, comprising an upper cover, a firstbelt pulley, arranged on an axle extending substantially parallel with an axis ofrotation of the grinding head, and a second belt pulley, spaced from the firstbelt pulley in a direction perpendicular to the axis of rotation of the grindinghead, and partially overlapping the first belt pulley, its associated axle and/orits associated bearing, as seen in a plane parallel with the lower support,wherein the second belt pulley comprises an edge recess, which is sized andadapted such that when the edge recess is arranged with its opening towardsthe axis of rotation of the first belt pulley, its associated axle and/or its associated bearingis free from said overlap. 7The edge recess makes it easier to assemble and disassemble the grinding head, both in connection with manufacture and in connection withservice of components of the machine.
    “Substantially para|e|” should be understood as being parallel +/- 20°,preferably +/- 10° or +/- 5°.
    The edge recess may extend over a central angle of the second beltpulley corresponding to less than 30°, preferably less than 20° or less than10°. Typically, the edge recess may extend over more than 5° or more than7°.
    The grinding head may further comprise an edge portion insert, whichmay be connectable to the second belt pulley at the edge recess, such thatperipheral shape of the second belt pulley may be restored.
    According to a fifth aspect, there is provided a grinding head for a floorgrinding machine, comprising: a grinding head casing enclosing atransmission mechanism for transferring power an ingoing axle to cause thegrinding head to rotate, wherein the transmission mechanism comprises atleast one belt pulley, and at least one belt, wherein the belt pulley presents areleasably attachable edge portion, which extends over more than 50°,preferably more than 70° or more than 80° central angle of the belt pulley, andwhich, when released, is movable relative to the remainder of the belt pulley,such that a circumference of the belt pulley is reducible, and wherein the beltis resiliently flexible, such that its length is extended by 2.0-10 °/>, preferably2.0-5 °/>, 2.2-10 °/-.~ or 2.2-5 °/>.when in a mounted state as compared to arelaxed state. Typically, the edge portion may extend over less than 120°,less than 100°.
    Hence, the belt may be of a kind which is designed to provide apredetermined force at a predetermined expanded length.
    The releasably attachable edge portion makes it easier to assembleand disassemble the grinding head, both in connection with manufacture andin connection with service of the belt.
    This aspect is particularly useful for belt pulleys providing secondaryrotation, i.e. belt sheaves which are fixedly connected to the machine frame.
    The edge portion may be slidable towards a centre of the belt pulley. 8Alternatively, the edge portion may be entirely removable from the belt pulley.
    The belt pulley may be fixedly attachable to the grinding head casing.
    The transmission mechanism in which the belt is operable may containonly pulleys which are fixed relative to each other.
    Hence, there is no belt tensioner operating on this belt.
    The grinding head may be a planetary type grinding head, which maybe rotatable relative to a machine frame, and may carry a plurality of grindingdiscs, each of which being rotatable relative to the grinding head.
    A floor grinding machine may comprise: a machine frame, a motor,supported by the machine frame, a grinding head as claimed defined herein,supported by the machine frame and operatively connected to the motor,such that the grinding head may be rotatably drivable by the motor. lt is understood that the motor can be electric motor or a combustionengine (such as for petrol, gas, diesel or other fuel).
    According to a sixth aspect, there is provided a method of assemblinga grinding head for a floor grinding machine, comprising: providing a firstgrinding head casing member comprising a support, arranging at least twoaxles relative to the support, providing a second grinding head casingmember comprising a cover, assembling the casing members through arelative axial movement of the casing members towards each other,characterised by causing the axles to engage the second grinding headcasing member at different relative axial positions of the casing members.
    According to a seventh aspect, there is provided a method of setting abelt tensioner in a grinding head for a floor grinding machine for grinding floorsurfaces of stone or stone-like material, comprising: setting a position of apulley of the belt tensioner, which pulley is enclosed in a hollow grinding headcasing and displaceable in a direction perpendicular to an axis of rotation ofthe grinding head, in said direction, without opening the grinding head casing.
    The method may further comprise: releasing a locking device, suchthat the belt tensioner becomes displaceable, carrying out said setting step, and engaging the locking device, so as to prevent displacement of the belt 9tensioner, wherein said releasing and said engaging steps are carried out without opening the grinding head casing. ln the method, setting a position may comprise applying apredetermined torque.
    For example, a torque wrench or other type of torque measuring ortorque indicating lever device may be used and connected to the torqueconnector.
    According to a eighth aspect, there is provided a method of servicing,assembling or disassembling a first belt pulley of a grinding head for a floorgrinding machine for grinding floor surfaces of stone or stone-like material,comprising: opening a grinding head casing of the grinding head, bringing anedge recess of a second belt pulley, which partially overlaps the first beltpulley, an axle and/or a seat associated with the first belt pulley, intoalignment with a rotational axis of the first belt pulley, such that the first beltpulley, its axle and/or its seat is free from said overlap.
    According to a ninth aspect, there is provided a method of attaching orreleasing a belt housed in a grinding head of a floor grinding machine,comprising: releasing a releasably attachable edge portion of a belt pulley,which edge portion extends over more than 30°, preferably more than 45° ormore than 60° central angle of the belt pulley, moving the releasablyattachable edge portion relative to the grinding head such that acircumference of the belt pulley is reduced, applying or removing the belt, asthe case may be, putting the releasably attachable edge portion back, andattaching the releasably attachable edge portion.
    The belt pulley may be rotated such that the releasably attachableedge portion may face another belt pulley, which the belt runs over,subsequently releasing and moving or sliding the releasably attachable edgeportion out of contact with the belt, rotating the belt pulley relative the grindinghead, such that parts of the belt pulley which surround the releasablyattachable edge portion contact the belt, and removing the belt.
    The belt pulley may be rotated, such that parts of the belt pulley whichsurround the releasably attachable edge portion may be in a position wherethey would contact the belt, releasing and moving or sliding the releasably l 0attachable edge portion out of contact with the belt, arranging the belt over the pulley and over at least one other belt pulley, rotating the belt pulleyrelative the grinding head, such that the releasably attachable edge portionfaces the other belt pulley, and subsequently putting the releasably attachable edge portion back.
    Brief description of the drawinos Fig. 1 is a schematic perspective view from behind of a floor grindingmachine, in which the concepts according to the present disclosure may beapplied.
    Fig. 2a is a schematic cross sectional perspective view of a grindinghead.
    Fig. 2b is a schematic cross sectional view of joined portions ofgrinding head casing members.
    Figs 2c-2d are schematic perspective views of grinding head casingmembers.
    Figs 3a-3b are schematic views, exploded and cross sectional topview, respectively, of a grinding head having three grinding disks.
    Figs 4a-4b are schematic views, exploded and cross sectional topview, respectively, of a grinding head having four grinding disks.
    Figs 5a-5b schematically illustrate a process of two axles engagingwith a respective seat.
    Figs 6a-6c are schematic perspective views of a belt tensioner, atensioner setting device and a locking device.
    Figs 7a-7c are schematic perspective views of an edge recess of a beltpulley.
    Figs 8a-8c schematically illustrate a device and process for mountingor releasing a belt.
    Detailed descriptionFig. 1 schematically illustrates a floor grinding machine 100. The grinding machine 100 comprises a machine frame 101 which supports a 11grinding head 1 and a motor 102. The grinding head 1 is driven by the motor 102 to rotate.
    The grinding head 1 as illustrated herein is formed as a planetary typegrinding head, i.e. the grinding head casing is rotatable relative to themachine frame 101, and in turn carries two or more grinding disks, each ofwhich being rotatable relative to the casing.
    The grinding head 1 may comprise a casing, which is rotatable inside ahood 103. The casing may enclose the transmission mechanism for achievingthe above mentioned rotational movements.
    The hood 103 may be arranged to enclose the grinding head 1, suchthat grinding residues are contained and can be readily co|ected by e.g. acollection device as will be further described.
    The machine 100 may thus further comprise a collection device forcollecting grinding residues, such as dust, water and the like. The collectiondevice may comprise a hood connector, such that a space enclosed by thehood is in fluid connection with a dust collector, and optionally a channel,such as a hose or a pipe 104. A hose 104 leading to the dust collector, suchas a vacuum cleaner, may be directly connectable to the hood connector, orto the channel.
    The machine 100 may further comprise a handle frame 105 extendingfrom an upper rear portion of the machine frame 101. The handle frame 105may support a handle 106 for a user to grip and/or steer the machine 100,and optionally a user interface 107.
    The user interface 107 may comprise an output device, such as adisplay, which may be a touch screen, for displaying information. The userinterface may further comprise one or more input devices, such as a touchscreen, buttons, knobs and/or a keyboard for the user to control the machine100.
    The machine 100 may be supported by wheels, such as by a pair ofcoaxial wheels 108. The wheels may provide part of the support, withadditional, or even most, support provided by the grinding head 1.
    The wheels may be freely rotatable, whereby the machine 100 may bepropelled entirely by being pushed and/or pulled by the user. 1 2As another option, the wheels may be driven by one or more motors.
    For example, the wheels may be individually drivable, whereby steering of themachine 100 by e.g. radio control may be enabled.
    The machine 100 may comprise a control unit, which containsfunctionality for controlling the machine 100 and/or feeding back information,such as setting a speed of the rotating discs, and reporting a temperature ofthe grinding discs.
    Fig. 2a schematically illustrates a grinding head 1. The grinding head 1comprises a casing formed by a lower casing member 3, comprising a lowersupport 31, which may be substantially planar, and an upwardly extendingedge portion 32, which may form an edge rim of the lower casing member.
    The grinding head may further comprise an upper casing member 2,comprising an upper cover 21, which may be substantially planar, and adownwardly extending edge portion 22, which may form an edge rim of thelower casing member.
    The lower support 31 and the upwardly extending edge portion 32 maybe integrated with each other. For example, they may be formed in one piece,such as by casting. Suitable materials may be iron, aluminium, or alloysbased on iron or aluminium. Alternatively, the lower support 31 and the upwardly extending edge portion 32 may be integrated with each other by e.g. welding or other permanent fixation.
    Similarly, the upper cover 21 and the downwardly extending edgeportion 22 may be integrated with each other. They may be formed in onepiece, by e.g. casting.
    The axially distal portions of the edge portions 22, 32 are joinedtogether forming a hollow grinding head casing.
    Referring to Fig. 2b, there may be provided a seal 23 between thedistal portions of the edge portions 22, 32. The seal 23 may be provided inthe form of a strip of flexible or resilient material, such as rubber, or by meansof setting sealing compound, such as silicone. Combinations are alsopossible. Fig. 2b also illustrates a way of interconnecting the casing members2, 3, by means of a bolt 24, which is inserted into a hole in one of the casing members to engage a thread in the other one of the casing members 2, 3. 13Alternatively, the fastener may comprise a bolt/nut connection, a rivet, a screw and/or a clamp. Alternatively, the joined portion may be permanentlyfastened by e.g. welding.
    As is illustrated in Fig. 2b, distal parts of the edge portions 22, 32 maypresent respective axial support surfaces 25, 35, which typically provideplanar surfaces that abut each other when the casing members 2, 3 are in ajoined state. The axial support surfaces 25, 35 may be continuous surfaceswith e.g. annu|ar shape.
    I/|oreover, there may be provided radia| support surfaces 26, 36,including an radially outwardly facing radia| support surface 26 arranged onone of the casing members 3 and a radially inwardly facing radia| supportsurface 36 arranged on the other one of the casing members 2.
    There may also be provided at least one bevel 34 on one or both of theedge portions. Such bevel may include an obliquely inwardly facing bevel 34arranged on one of the casing members 3 and/or an obliquely outwardlyfacing bevel arranged on the other one of the casing members 2.
    These bevels may function as initially guiding surfaces, which mayfacilitate the axial joining of the casing members 2, 3.
    Referring to Figs. 2c and 2d, there is illustrated how guide pins 38a,38b and guide recesses 37a, 37b may be used to ensure correct relativeangular alignment of the casing members 2, 3.
    The casing encloses a transmission mechanism for causing thegrinding head 1 to rotate relative to the machine frame 101, as well as forcausing the grinding disks to rotate relative to the grinding head casing 2, 3.
    The transmission may comprise a central axle 7, adapted to beconnected to the motor 102 and provided with a central belt sheave or beltpulley 71, grinding disc axles 61, 62, 63, 64 associated with a respectivegrinding disk and each being provided with a respective belt sheave or beltpulley 611, 621, 631, 641. The transmission may further comprise a first belt51, running over the central belt pulley 71 and over the belt pulleys 611, 621,631, 641. ln addition, the first belt 51 may run over one or more deflection pulleys, as deemed necessary. 14With the axles 7, 61, 62, 63, 64 and the first belt 51 providing for the transmission of rotary movement from the motor 102 to the disk axles 61, 62,63, 64 to cause the grinding disks to rotate relative to the grinding headcasing 2, 3, a secondary transmission may be provided for achieving therotation of the grinding head 1 relative to the machine frame 101.
    This secondary transmission may comprise a secondary belt pulley612, 632 provided on one or more of the axles 61, 62, 63, 64 and a grindinghead belt pulley 8, which is fixed relative to the machine frame 101.
    Figs. 3a-3b and 4a-4b respectively illustrate a grinding head 1comprising three and four grinding disks.
    The casing members 2, 3, may comprise respective seats for receivingthe components forming the transmission mechanism. For example, thecasing members 2, 3, may comprise seats for axles, bearings or othermounting devices. ln particular, the lower casing member 3 of the grinding head 1 maycomprise seats 311, 312, 313, 314, 317 for the axles 61-64 and 7 ( axles notshown in Figs. 3a-3b and 4a-4b).
    The seats may be formed as recesses or inwardly protruding rims(which may be continuous as illustrated, or intermittent, e.g. crenellated)providing an axial support surface and surrounding supports, such as thesurrounding rims shown in Figs 3a-3b and 4a-4b. Further reinforcements ofthe seats may be provided. For example, ridges extending radially from therespective seat may be provided.
    The belt 51 may extend between the central axle 71, the grinding diskpulleys 611, 621, 631, 641 and a belt tensioner pulley 41.
    As mentioned, the transmission mechanism may further comprise agrinding head pulley 8, i.e. a pulley that is fixedly connected to the machineframe 101, and a second belt 52, arranged to transfer torque from one of thegrinding disk axles to the grinding head pulley 8, thus causing the grindinghead 1 to rotate relative to the machine frame 101.
    The grinding head 1 may comprise at least two axles 61, 62, extendingbetween the upper and lower casing members 2, 3, as illustrated in Figs. 5a-5b.
    The process of assembling the casing members 2, 3, will be described with reference to Figs 5a-5b.
    One respective end of the axles 61, 62, may be initially arranged in oneof the casing members 2, 3. Typically, most of the transmission mechanism isinitially mounted in the upper casing member 2, after which the lower casingmember 3 is brought into place and connected to the upper casing member 2.
    This initial mounting may include mounting the components in anaxially fixed manner relative to this upper casing member 2. ln Figs. 5a-5b, one end of each of the axles 61, 62, may be initiallyarranged in the lower casing member 3. The ends may be fixed introducedinto seats 211, 212, in the upper casing member 2. This connection may beprovided with a small radial play, with zero radial play or even with a slightnegative play. Alternatively, one end of the axle 61 may be initially fixed in theupper casing member 2 and one end of the axle 62 may be fixed in the lowercasing member 3.
    The axles 61, 62, may be arranged in a seat of the casing member 2,3. The seat may be a recess formed in the casing member, such as in thelower support 31 and in the upper cover 21, as described above.
    Alternatively, the seats may be formed by a respective guide or rimextending upwardly from the lower support 31 and/or the upper cover 21 soas to surround the axle 61, 62,. The guide may present a shapecorresponding to an outer shape of the part that is to be received in it, asseen in a plane parallel with the lower support 31.
    When the grinding head 1 is assembled through a relative axialmovement of the upper and lower casing members 2, 3, towards each other,the respective other end of the axles 61, 62, may engage the other one of thecasing members 2, 3 at different relative axial positions of the casingmembers 2, 3.
    As illustrated in Figs. 5a-5b, the upper and lower casing members 2, 3may present a respective first axle seat 211, 311, and a respective secondaxle seat 212, 312. ln the illustrated example, both axles 61, 62, are initiallyarranged in the seats 311 and 312 of the lower casing member 3. l 6The axles 61, 62, may engage the other casing member at different relative axial positions of the casing members 2, 3. That is, in Fig. 5a, axle 62will engage the upper casing member 2 before axle 61 engages the uppercasing member 2.
    To this end, a length of the first axle 61 may differ from a length of thesecond axle 62, as i|ustrated in Fig. 5a. A length difference may be on theorder of O.5-15 mm, preferably 1-5 mm.
    As another option, or supplement, a distance between the first axleseats 211, 311, may differ from a distance between the second axle seats212, 312. Also here, the difference in distance may be on the order of O.5-15mm, preferably 1-5 mm.
    Alternatively, the seats 211, 311, 212, 312, may have different depths,or different rim heights, as i|ustrated in Fig. 5b. The difference in depth or rimheight may be on the order of O.5-15 mm, preferably 1-5 mm.
    Once received in the lower casing member 3, the axles, bearings orother parts contacting the lower casing member 3 may be axially moveablerelative to the lower casing member. Hence, heat expansion may becompensated for. Fïadially, however, the axle, bearing or other part may befixed with zero or even negative play.
    Referring to Figs 6a-6c, a belt tensioner 4 will be described.
    Fig. 6a schematically illustrates a portion of a grinding head 1, withmost of the lower casing member 3 cut away to reveal the interior of thegrinding head 1.
    The belt tensioner 4 comprises a pulley 41, which is arranged toengage the first belt 51.
    A rotational axis of the pulley is displaceable in a plane perpendicularto the rotational axis of the grinding head 1. ln the i|ustrated example, thepulley 41 is arranged on one or more pulley levers 42 extending from asetting axle 43, about which the rotational axis and the pulley 41 arepivotable.
    The setting axle 43 is accessible through an opening 48 in the casing member 3. 1 7Henoe, the pulley 41 is displaoeable by rotation about the setting axle 43.
    A looking device 44, 45, 46, for looking the pulley 41 at an angularposition about the setting axle 43 is provided. The looking device 44, 45, 46,may oomprise a looking lever 44, whioh is fixedly oonneoted to the settingaxle 43 and a fastener 45 that is arranged to aot on the looking lever 44 toprevent the looking lever 44, and thus also the pulley lever 42 from rotatingabout the setting axle 43.
    The looking lever 44 may be integrated with, suoh as e.g. formed inone pieoe with, the pulley lever 42. For example, these two oomponents maybe formed from a single planar pieoe of material.
    The lever fastener 45 may oomprise a bolt and a devioe 46 providingan anvil, whioh through a threaded oonneotion may engage the bolt, suoh thatwhen the bolt is rotated relative to the anvil, the anvil will olamp the lookinglever towards the inside of the oasing member 3.
    The anvil devioe 46 may be initially oonneoted to the oasing member 3before assembly of the oasing members 2, 3. ln partioular, suoh oonneotionmay provide some play, at least in a direotion parallel with the lower support31.
    The looking lever 44 may oomprise a slit 441, whioh may be ourvedwith a bending radius oorresponding to a radial distanoe from the setting axle43 to the slit 441. The slit 441 may be open at a short end thereof, so as tofaoilitate assembly.
    Figs 6a and 6b illustrate the tensioner 4 in an assembly position. Thetensioner 4 may be handled as follows during the assembly.
    As mentioned above, assembly of the grinding head 1 may beperformed by initially mounting most oomponents in one of the oasingmembers 2, 3, typioally the upper oasing member 2, and then, as one of thelast steps, mounting the other one (normally the lower oasing member 3) ofthe oasing members 2, 3.
    Henoe, in the illustrated example, the setting axle 43 and the levers 42,44 are initially mounted in the upper oasing member 3 (whioh here is turnedupside down for allowing assembly). 18The anvil device 46 is mounted on the inside of the lower casing member 3 and attached by means of an anvil fastener 461, which may be ascrew or bolt. The anvil device 46 may be Ioosely fastened, i.e. there may besome play in a plane perpendicular to the axle 43.
    The lever 44 is in a mounting position, which may correspond to anangular position at which the anvil device 46 and the lever 44 may pass eachother, as seen in the axial direction.
    The lower casing member 3 is then aligned with the upper casingmember 2 and moved axially into engagement with the upper casing member2.
    Once engagement between the casing members 2, 3 has beenachieved, and optionally these have been connected to each other, asdescribed above, the lever fastener 45 is brought into engagement with theanvil device 46.
    By applying a key to the axle portion 47 exposed through the opening48 in the lower casing member 3, the locking lever 44, and thus the pulleylever 42, may be pivoted anti-clockwise (as seen in Figs 6b-6c), such that theshaft of the lever fastener 45 enters the lever slit 441. The pivoting motionmay continue in the anti-clockwise direction until a sufficient belt tension isachieved, as illustrated in Fig. 6c, or as far as the lever slit 441 allows.
    A sealing device, such as an o-ring, may be provided between the axleportion 47 and the opening 48, such that dust and debris is prevented fromentering the casing 2, 3.
    Preferably, the key applied comprises a torque measuring, indicating orlimiting device, such that a predetermined torque may be applied to thesetting axle 43.
    When the desired angular position has been reached, the leverfastener 45 is further engaged, e.g. tightened, such that the lever 44 isclamped between the anvil device 46 and the lower casing 3.
    Referring to Figs 7a-7c, a solution for facilitating assembly and serviceof overlapping pulleys or other rotary components will be described.
    As is recognized from e.g. Figs 3a-3b and 4a-4b, the grinding headpulley 8 is positioned very close to the axles 61, 62, 63, 64 carrying the belt 19pulleys 611, 621, 631, 641, 612, 632. Consequently, a portion of the axles 61, 62, 63, 64, or bearings associated with the belt pulleys 611, 621, 631, 641,612, 632, may overlap with part of the grinding head pulley 8. Whenassembling the grinding head 1, such portions of the axles may need to beassembled before the grinding head pulley 8 is assembled. I/|oreover, thegrinding head pulley 8 may need to be removed before the axles 61, 62, 63,64, their associated pulleys 611, 621, 631, 641, 612, 632, or bearings, maybe removed.
    Hence, a periphery of the grinding head pulley may be provided withone or more edge recesses 81, i.e. recesses extending from the periphera|edge and radially inwardly to a sufficient extent, such that, when the edgerecess 81 is a|igned with the pulley axle 61,62, 63, 64, the pulley axle 61, 62,63, 64, is free from overlap with the grinding head pulley 8, as illustrated inFig. 7b.
    The edge recesses 81 may present a radia| extent of about 1-20 °/> of aradius of the grinding head pulley 8, preferably 1-10 °/> or 1-5 °/-.~. The edgerecess 81 should preferably have an extent such that it reduces thecircumference of the belt pulley 8 by less than 2 °/>, preferably by less than 1°/°, as compared to the case where the belt pulley 8 was perfectly circular.
    I/|oreover, the edge recess 81 may extend over a central angle of thegrinding head pulley 8 corresponding to less than 30°, preferably less than20° or less than 10°. ln preferred embodiments, the angle may be 12° +/- 1° or14° +/- 1°.
    Referring to Fig. 7c, it is possible to provide an edge insert 84, whichmay be sized and adapted to restore the outer shape of the grinding headpulley 8.
    The edge insert 84 may be a removable piece, which may be removedwhen the edge recess 81 is needed. ln the alternative, it may be movablyconnected to the grinding head pulley 8, e.g. as illustrated in Fig. 7c, with anedge insert having a slidable connection to the grinding head pulley 8. Such aslidable connection may be provided by interaction of a bolt with one or moreslits. 2 OReferring to Figs 8a-8c, there will be described a solution for facilitating the installation of a belt 52 in a floor grinding machine 100. The solution isdescribed with respect to a grinding head belt pulley 8, but may be applied toany other pulley.
    The belt 52 may be a resilient belt, i.e. typically a belt which allows fora deformation when a force is applied to it. Typically, the deformation whenthe belt 52 is mounted may be on the order 2.0-10 °/>, preferably 2.0-5 °/>, 2.2-10 °/> or 2.2-5 °/>.
    As can be seen in Figs 8a-8c, there is no need for a separate belttensioner. The pulleys 8, 612, 632 and the slightly flexible belt 52 provide forthe necessary tension of the belt 52. ln Fig. 8a, there is illustrated the arrangement for causing the grindinghead 1 described above to rotate relative to the machine frame 101, as brieflymentioned above.
    To this end, the grinding head pulley 8 is fixedly attached to themachine frame 101. Axles 61, 63 of a pair of the grinding disk belt pulleys611, 631 are provided with additional belt pulleys 612, 632 for engaging asecond belt 52, which thus runs around the grinding head belt pulley 8 andthe two additional belt pulleys 612, 632, which are arranged to rotate in thesame direction, as illustrated in Figs 8a-8c. ln order to facilitate assembly and disassembly of the belt 52, thegrinding head belt pulley 8 may be provided with one or more edge recesses82. The edge recesses 82 should have an extent such that a circumference ofthe belt pulley 8 is reduced by more than 2 °/>, preferably by more than 5 °/>,as compared to the case where the belt pulley 8 was perfectly circular.
    The edge recesses 82 are provided with releasably attachable edgeportions 83. Such edge portions 83 may be entirely removable, or merelymoveable relative to the grinding head pulley body. ln the example illustrated,the removably attachable edge portions 83 are slidable in a direction towardsa centre of the grinding head belt pulley 8, and fixable to the grinding headbelt pulley body by means of screws or bolts.
    Hence, it is possible to release and move the releasably attachableedge portion 83 to facilitate removal and/or attachment of the belt 52. 2 1The releasably attachable edge portion 83 may extend over more than 50°, preferably more than 70° or more than 80° central angle of the belt pulley8, but preferably over less than 120°. Preferred angles may be 80°+/- 2°.
    At this point it is easier to remove or position the second belt 52.
    After the belt 52 has been positioned (e.g. put back or replaced), thereleasably attachable edge portion 83 is put back and attached.
    For example, the releasably attachable edge portion 83 may facilitateremoval of a belt 52, and in particular a secondary belt, according to thefollowing method.
    The belt pulley 8 is initially arranged (e.g. rotated to a position) suchthat the releasably attachable edge portion 83 faces one of the other beltpulleys 612, 632, which the belt 52 runs over.
    At this point, the releasably attachable edge portion 83 is released andmoved, e.g. by a sliding movement towards the centre of the grinding headbelt pulley 8, as illustrated in Fig. 8b. lt is noted, that so far, the belt 52 will stillbe fully in contact with the belt pulleys 612, 632, and not yet ready for beingremoved.
    The belt grinding head belt pulley 8 may then be rotated (Fig. 8c) suchthat parts of the belt pulley 8 which surround the releasably attachable edgeportion 83 contact the belt 52. The rotation may be about 80°-100°, preferably90°. That is, both lateral sides of the releasably attachable edge portion 83will contact the grinding head belt pulley body.
    At this point, the effective circumference of the grinding head beltpulley 8 has been reduced, and the belt 52 may readily be removed. lt is understood that this operation may be done for one or morereleasably attachable edge portions 83.
    As another example, the releasably attachable edge portion 83 mayfacilitate mounting, putting back or replacing a belt 52.
    To this end, the belt pulley 612, 632, is initially arranged (e.g. rotated)such that parts of the belt pulley which surround the releasably attachableedge portion 83 are in a position where they would contact the belt 52 (Fig.8c). 22At this point, the releasably attachable edge portion 83 may be released and moved out of contact with the belt 52. ln the alternative, e.g.when initially assembling the grinding head 1, the grinding head belt pulleybody may be supplied and mounted without the releasably attachable edgeportion 83, and this releasably attachable edge portion 83 may then besupplied during the mounting process.
    The belt 52 is then arranged over the grinding head belt pulley 8 andover at least one other belt pulley 612, 632.
    The grinding head belt pulley 8 is then rotated (Fig. 8b), such that thereleasably attachable edge portion 83, or the portion where it is to bemounted, faces the other belt pulley 612, 632.
    At this point, the releasably attachable edge portion 83 may be movedback towards its position at the periphery, or initially supplied and thusarranged at its position at the periphery, such that a circular shape of thepulley 8 is restored.
    The releasably attachable edge portion 83 is then attached to thegrinding head belt pulley body, after which the assembly has been completed(Fig. 8a).
    权利要求:
    Claims (36)
    [1] 1. A grinding head (1) for a floor grinding machine (100) forgrinding floor surfaces of stone or stone-like material, the grinding head (1)comprising: a lower casing member (3), comprising a lower support (31) and anupwardly extending edge portion (32), and an upper casing member (2), comprising an upper cover (21) and adownwardly extending edge portion (22), wherein the upper casing member (2) is joinable to the lower casingmember (3) by causing axially distal portions of the edge portions (22, 32) to bear on each other.
    [2] 2. The grinding head (1) as claimed in claim 1, wherein the uppercover (21) and the downwardly extending edge portion (22) are formed in one piece.
    [3] 3. The grinding head (1) as claimed in claim 1 or 2, wherein thelower support (31) and the upwardly extending edge portion (32) are formed in one piece.
    [4] 4. The grinding head (1) as claimed in any one of the precedingclaims, wherein the upwardly and downwardly extending edge portions (22,32) extend over a height corresponding to about 25-75 °/> of a total height of the grinding head (1).
    [5] 5. The grinding head (1) as claimed in any one of the precedingclaims, wherein: the distal portion of the edge portion of one of the casing members (2,3) comprises an axial support surface (25) and a radially outwardly facingradial support surface (26), and 24the distal portion of the edge portion of the other casing member comprises an axial support surface (35) and a radially inwardly facing radialsupport surface (36),such that when the casing members (2, 3) are in a joined state, the axial support surfaces (25, 35) abut each other and the inwardly facing radialsupport surface (36) is positioned radially outside the outwardly facing radialsupport surface (26).
    [6] 6. The grinding head (1) as claimed in c|aim 5, wherein the othercasing member (3) comprises an inwardly inclined bevel (34), for radiallyguiding the casing member (2) when joining the casing members (2, 3)
    [7] 7. The grinding head (1) as claimed in any one of the precedingclaims, wherein one of the casing members comprises at least one guideprotrusion (38a, 38b), extending axially from an axially outermost part of itsedge portion, and wherein the other casing member (2, 3) comprises a recess (37a, 37b)sized, positioned and adapted for receiving the guide protrusion (38a, 38b).
    [8] 8. A grinding head (1) for a floor grinding machine (100) forgrinding floor surfaces of stone or stone-like material, the grinding head (1)comprising: a lower casing member (3), comprising a lower support (31) and anupwardly extending edge portion (32), and an upper casing member (2), comprising an upper cover (21) and adownwardly extending edge portion (22), a first axle (61), extending between the upper and lower casingmembers (2, 3), and a second axle (62), extending between the upper and lower casingmembers (2, 3), wherein the axles (61, 62) are initially arranged in one of the casingmembers (2, 3), such that, when the grinding head (1) is assembled through a relative axial movement of the upper and lower casing members (2, 3) 2 5towards each other, the axles (61, 62) will engage the other one of the casing members (2, 3) at different relative axial positions of the casing members (2,3).
    [9] 9. The grinding head (1) as c|aimed in c|aim 8, wherein, when thecasing members are completely axially joined, the axles are axially fixedlyconnected to said one of the casing members, and axially moveable relativeto the other one of the casing members.
    [10] 10. The grinding head (1) as c|aimed in c|aim 8 or 9, wherein theupper and lower casing members (2, 3) present a respective first axle seat(211, 311) and a respective second axle seat (212, 312), and wherein a distance between the first axle seats (211, 311) differs froma distance between the second axle seats (212, 312).
    [11] 11. The grinding head (1) as c|aimed in any one of claims 8-10,wherein an axial distance between radial seat guides (211, 311) associatedwith the first axle (61) is different from an axial distance between radial seatguides (212, 312) associated with the second axle (62).
    [12] 12. The grinding head (1) as c|aimed in any one of claims 58-11,wherein a length of the first axle (61) differs from a length of the second axle(62).
    [13] 13. A grinding head (1) for a floor grinding machine (100) forgrinding floor surfaces of stone or stone-like material, the grinding headcomprising: a hollow grinding head casing enclosing: a drive axle, at least two belt pulleys associated with a respective grinding disk, a belt (51) running over said belt pulleys and said drive axle, a belt tensioner (4), comprising a tensioner pulley (41), which isdisplaceable by rotation about a setting axis (43), which is spaced from the 26tensioner pulley (41) by a pulley lever (42), the setting axis being parallel withan axis of rotation of the grinding head (1 ), and a tensioner setting device, for setting a position of the pulley (41) insaid direction by application of a torque about the setting axis (43), wherein the tensioner setting device is accessible from outside of thegrinding head casing (2, 3), such that the belt tensioner (4) can be adjustedwhile the grinding head (1) is in an assembled state.
    [14] 14. The grinding head (1) as claimed in claim 13, further comprising aIocking device (44, 45, 46), for Iocking the belt tensioner (4) relative to thegrinding head (1), wherein said Iocking device (44, 45, 46) is also accessiblefrom the outside of the grinding head casing (2, 3).
    [15] 15. The grinding head (1) as claimed in claim 14, wherein the Iockingdevice (44, 45, 46) comprises a Iocking lever (44), which is fixedly connectedto an axle (43) about which the belt tensioner (4) is rotatable, and a Iockingfastener (45), arranged to releasably fasten the Iocking lever (44) relative tothe casing (2, 3), such that rotation about the setting axis (43) is prevented.
    [16] 16. The grinding head (1) as claimed in any one of claims 13-15,wherein a torque connector is provided coaxially with the setting axis (43),said torque connector being permanently exposed on an outside of thegrinding head casing.
    [17] 17. The grinding head (1) as claimed in claim 16, wherein the tensionersetting device is accessible through an opening (48) in a casing member 2,3)and wherein a sealing device is arranged between the connector and theopening (48).
    [18] 18. The grinding head (1) as claimed in any one of claims 13-17,further comprisinga lower casing member (3), and an upper casing member (2) 27
    [19] 19. A grinding head (1) for a floor grinding machine (100) forgrinding floor surfaces of stone or stone-like material, the grinding headcomprising: a lower casing member (3), comprising a lower support (31), an upper casing member (2), comprising an upper cover (21), a first belt pulley (611), arranged on an axle extending substantiallyparallel with an axis of rotation of the grinding head (1), and a second belt pulley (8), spaced from the first belt pulley (611) in adirection perpendicular to the axis of rotation of the grinding head (1), andpartially overlapping the first belt pulley (611), its associated axle and/or itsassociated bearing, as seen in a plane parallel with the lower support (31), wherein the second belt pulley (8) comprises an edge recess (81 ),which is sized and adapted such that when the edge recess (81) is arrangedwith its opening towards the axis of rotation of the first belt pulley (611), thefirst belt pulley (611), its associated axle and/or its associated bearing is free from said overlap.
    [20] 20. The grinding head (1) as claimed in claim 19, wherein the edgerecess (81) extends over a central angle of the second belt pulley (8)corresponding to less than 30° , preferably less than 20° or less than 10°, andmore than 5°.
    [21] 21. The grinding head (1) as claimed in claim 19 or 20, furthercomprising an edge portion insert (84), which is connectable to the secondbelt pulley (8) at the edge recess (81), such that peripheral shape of thesecond belt pulley (8) is restored.
    [22] 22. A grinding head (1) for a floor grinding machine (100),comprising: a grinding head casing enclosing a transmission mechanism fortransferring power from an ingoing axle (7) to cause the grinding head (1) torotate, 28wherein the transmission mechanism comprises at least one belt pulley (8), and at least one belt (52), wherein the belt pulley (8) presents a releasably attachable edgeportion (83), which extends over more than 50°, preferably more than 70° ormore than 80° central angle of the belt pulley (8), and less than 120°, andwhich, when released, is movable relative to the remainder of the belt pulley(8), such that a circumference of the belt pulley (8) is reducible, and wherein the belt (52) is resiliently flexible, such that its length isextended by 2.0-10 °/>, preferably 2.0-5 °/>, 2.2-10 °/-.~ or 2.2-5 °/>.when in a mounted state as compared to a relaxed state.
    [23] 23. The grinding head (1) as claimed in claim 22, wherein the edge portion (83) is slidable towards a centre of the belt pulley (8).
    [24] 24. The grinding head (1) as claimed in claim 22, wherein the edge portion (83) is entirely removable from the belt pulley (8).
    [25] 25. The grinding head (1) as claimed in any one of claims22-24,wherein the belt pulley (8) is fixedly attachable to the grinding head casing (2,3).
    [26] 26. The grinding head (1) as claimed in any one of claims 22-25,wherein the transmission mechanism in which the belt (52) is operable contains only pulleys which are fixed relative to each other.
    [27] 27. The grinding head (1) as claimed in any one of the precedingclaims, wherein the grinding head (1) is a planetary type grinding head, whichis rotatable relative to a machine frame (101), and carries a plurality ofgrinding discs, each of which being rotatable relative to the grinding head (1).
    [28] 28. A floor grinding machine (100) comprising:a machine frame (101),a motor (102), supported by the machine frame (101), 29a grinding head (1) as claimed in any one of the preceding claims,supported by the machine frame (101) and operatively connected to themotor (102), such that the grinding head (1) is rotatably drivable by the motor(102).
    [29] 29. A method of assembling a grinding head for a floor grindingmachine, comprising: providing a first grinding head casing member comprising a support, arranging at least two axles re|ative to the support, providing a second grinding head casing member comprising a cover, assembling the casing members through a re|ative axia| movement ofthe casing members towards each other, characterised by causing the axles to engage the second grinding head casing memberat different re|ative axia| positions of the casing members.
    [30] 30. A method of setting a belt tensioner in a grinding head for a floorgrinding machine for grinding floor surfaces of stone or stone-like material, comprising:setting a position of a pulley of the belt tensioner, which pulley is enclosed in a hollow grinding head casing and displaceable in a directionperpendicular to an axis of rotation of the grinding head, in said direction,without opening the grinding head casing.
    [31] 31. The method as claimed in claim 30, further comprising: releasing a locking device, such that the belt tensioner becomesdisplaceable, carrying out said setting step, and engaging the locking device, so as to prevent displacement of the belttensioner, wherein said releasing and said engaging steps are carried out withoutopening the grinding head casing.
    [32] 32. The method as claimed in claim 30 or 31, wherein setting a position comprises applying a predetermined torque.
    [33] 33. A method of servicing, assembling or disassembling a first beltpulley of a grinding head for a floor grinding machine for grinding floorsurfaces of stone or stone-like material, comprising: opening a grinding head casing of the grinding head, bringing an edge recess of a second belt pulley, which partiallyoverlaps the first belt pulley, an axle and/or a seat associated with the firstbelt pulley, into a|ignment with a rotationa| axis of the first belt pulley, such that the first belt pulley, its axle and/or its seat is free from said ovenap.
    [34] 34. A method of attaching or re|easing a belt housed in a grindinghead of a floor grinding machine, comprising: re|easing a releasably attachable edge portion of a belt pulley, whichedge portion extends over more than 50°, preferably more than 70° or morethan 80° central angle of the belt pulley, and less than 120°, moving or sliding the releasably attachable edge portion relative to thegrinding head such that a circumference of the belt pulley is reduced, applying or removing the belt, as the case may be, putting the releasably attachable edge portion back, and attaching the releasably attachable edge portion.
    [35] 35. The method as claimed in claim 34, wherein the belt pulley isrotated such that the releasably attachable edge portion faces another beltpulley, which the belt runs over, subsequently re|easing and moving the releasably attachable edgeportion out of contact with the belt, rotating the belt pulley relative the grinding head, such that parts of thebelt pulley which surround the releasably attachable edge portion contact thebeH,and removing the belt. 31
    [36] 36. The method as claimed in claim 34 or 35, wherein the belt pulleyis rotated, such that parts of the belt pulley which surround the releasabiyattachable edge portion are in a position where they would contact the beit, releasing and moving or sliding the releasably attachable edge portionout of contact with the beit, arranging the belt over the pulley and over at least one other beitpulley, rotating the belt pulley relative the grinding head, such that thereieasabiy attachable edge portion faces the other belt pulley, and subsequently putting the reieasabiy attachable edge portion back.
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    同族专利:
    公开号 | 公开日
    EP3463753A1|2019-04-10|
    AU2019200095B2|2020-07-09|
    EP3520961A1|2019-08-07|
    SE542092C2|2020-02-25|
    CN109715343A|2019-05-03|
    EP3520961B1|2020-12-09|
    AU2017272787B2|2020-07-16|
    AU2020233689A1|2020-10-08|
    US20190202025A1|2019-07-04|
    AU2020233689B2|2022-01-13|
    AU2017272787A1|2019-01-17|
    AU2019200095A1|2019-01-31|
    CN112372408A|2021-02-19|
    CN109715343B|2021-06-11|
    WO2017207722A1|2017-12-07|
    CN112405160A|2021-02-26|
    EP3769914A1|2021-01-27|
    EP3463753B1|2020-10-21|
    CA3025978A1|2017-12-07|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1650787A|SE542092C2|2016-06-03|2016-06-03|Grinding head for floor grinding machine and a floor grinding machine comprising such a grinding head|SE1650787A| SE542092C2|2016-06-03|2016-06-03|Grinding head for floor grinding machine and a floor grinding machine comprising such a grinding head|
    AU2017272787A| AU2017272787B2|2016-06-03|2017-06-01|Grinding head for floor grinding machine and method of assembling a grinding head, setting a belt tensioner, servicing, assembling or disassembling a belt pulley for a floor grinding machine|
    CN201780034348.4A| CN109715343B|2016-06-03|2017-06-01|Grinding head for floor grinding machine and method for assembling grinding head, setting belt tensioner, repairing, assembling or disassembling belt pulley of floor grinding machine|
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