Abstract:
In order to provide a handheld abrading machine comprising a holding device for holding the abrading machine, a drive motor, a motor housing for the drive motor and a tool head, wherein the holding device comprises a substantially tubular bar which has a proximal end and a distal end, wherein the motor housing and the drive motor arranged therein are arranged at the proximal end and wherein the tool head is arranged at the distal end, with which the abrading process is easy and as fatigue-free as possible, it is proposed that the motor housing comprise an attachment section for fixing an extension element in releasable manner.

Description:
RELATED APPLICATION 
       [0001]    This application is a continuation application of international application No. PCT/EP2014/064003 filed on Jul. 1, 2014, and claims the benefit of German application No. 10 2013 213 271.9 filed on Jul. 5, 2013, which are incorporated herein by reference in their entirety and for all purposes. 
     
    
     FIELD OF DISCLOSURE 
       [0002]    The present invention relates to a handheld abrading machine and in particular, to a so-called long-neck abrader. 
       BACKGROUND 
       [0003]    A handheld abrading machine is known from DE 10 2005 021 153 A1 for example. 
       SUMMARY OF THE INVENTION 
       [0004]    The object of the present invention is to provide a handheld abrading machine which allows a simple and as fatigue-free an abrading action as possible. 
         [0005]    This object is achieved by a handheld abrading machine which comprises a holding device for holding the abrading machine, a drive motor, a motor housing for the drive motor and a tool head, wherein the holding device comprises a substantially tubular bar which has a proximal end and a distal end, wherein the motor housing and the drive motor arranged therein are arranged at the proximal end and wherein the tool head is arranged at the distal end. 
         [0006]    In addition, in one embodiment of the invention, provision is made for the motor housing to comprise an attachment section for fixing an extension element in releasable manner. 
         [0007]    It can be expedient if the abrading machine comprises an extension element. However, provision could also be made for the extension element to be an element separate from the abrading machine. Preferably, a combination of an abrading machine and an extension element is then provided. 
         [0008]    An extension element is, in particular, an extension of the holding device for holding the abrading machine so that a user of the abrading machine can preferably reach a work area that is further away from him with the tool head of the abrading machine. 
         [0009]    In a further embodiment of the invention, provision may be made for the abrading machine to comprise an attachment section for positively fixing an extension element in releasable manner. 
         [0010]    Preferably, the abrading machine and/or the extension element comprises a latching device for fixing the extension element and in particular for fixing it in releasable manner. 
         [0011]    As an alternative or in addition thereto, provision may be made for the abrading machine and/or the extension element to comprise a clamping device for fixing the extension element and in particular for fixing it in a force-locking manner. 
         [0012]    It can be expedient if the extension element is pushable onto the attachment section of the abrading machine and/or is insertable into the attachment section of the abrading machine. Preferably, the extension element is lockable to the attachment section of the abrading machine by the pushing and/or inserting process. 
         [0013]    It can be expedient if the latching device comprises at least one unlatching element by means of which the locking of the extension element is releasable for the purposes of removing the extension element. 
         [0014]    Preferably, the latching device comprises several, two for example, unlatching elements. 
         [0015]    For example, provision may be made for at least one unlatching element, in particular several, for example two, unlatching elements, to be in the form of a pushbutton. 
         [0016]    In particular, provision may be made for one pushbutton to be in the form of a spring-loaded pushbutton. 
         [0017]    The latching device preferably comprises two unlatching elements in the form of pushbuttons which are arranged on the extension element and/or the motor housing on mutually opposite sides of an attachment section of the extension element and/or on mutually opposite sides of the attachment section of the abrading machine, and in particular of the motor housing. 
         [0018]    In a further embodiment of the invention, provision may be made for the abrading machine to comprise an attachment section for fixing an extension element in releasable manner, wherein the attachment section comprises an end of a suction channel that is remote from the tool head, said channel extending from the tool head to the attachment section. 
         [0019]    It can be expedient if the extension element comprises an extension channel which joins the end of the suction channel of the abrading machine that is remote from the tool head in the assembled state of the extension element on the attachment section of the abrading machine. 
         [0020]    The attachment section of the abrading machine preferably comprises the proximal end of the tubular bar of the abrading machine, in particular the holding device of the abrading machine. 
         [0021]    The extension channel preferably adjoins the proximal end of the tubular bar. 
         [0022]    It can be expedient if the extension element comprises a rigid tubular bar. 
         [0023]    The tubular bar of the extension element preferably has, to at least an approximate extent, the same cross section and/or diameter as the tubular bar of the holding device of the abrading machine. 
         [0024]    In one embodiment of the invention, provision may be made for the abrading machine to comprise an extension element which comprises an attachment section, and for the attachment section of the abrading machine to be in the form of a recess or gap in the motor housing, wherein the recess or gap in the motor housing and the attachment section of the extension element are formed in such a manner that the recess or gap in the motor housing is filled up by means of the attachment section of the extension element in the assembled state of the extension element on the motor housing. 
         [0025]    In particular, an outer contour of the motor housing defined by walls of the motor housing is completable by means of the attachment section of the extension element. 
         [0026]    Provision may be made for an outer surface of the attachment section of the extension element to be substantially flush with an outer surface of walls of the motor housing in the assembled state of the extension element on the motor housing. In this way, dirt-susceptible edges or protuberances in the transition area between the attachment section of the extension element and the attachment section of the motor housing can preferably be reduced or completely avoided. 
         [0027]    The extension element is preferably connectible to the tubular bar of the abrading machine in releasable manner by means of an adapter element. 
         [0028]    In particular, provision may be made for the extension element to be connectible to the tubular bar of the abrading machine in releasable manner in such a way that an interior space of the extension element joins an interior space of the tubular bar and is connected thereto in fluid-conveying manner. 
         [0029]    In this way, an extension channel for extending a suction channel of the abrading machine can be formed by means of the extension element. 
         [0030]    The abrading machine preferably comprises a connector device for the attachment of a suction device such as a vacuum cleaner for example. 
         [0031]    The extension element preferably adjoins the connector device of the abrading machine particularly in the region of the attachment section of the extension element in the assembled state of the extension element on the abrading machine. 
         [0032]    Preferably, an end of the extension element remote from the attachment section of the extension element likewise comprises a connector device to which a suction device and in particular a vacuum cleaner is connectible. 
         [0033]    Thus, a suction channel which extends from the tool head to the connector device of the extension element can be provided by means of the extension element. 
         [0034]    In one embodiment of the invention, provision may be made for the abrading machine to comprise at least one spring element by means of which the extension element is lockable to the abrading machine in a position substantially free from play in the assembled state. 
         [0035]    In particular, the at least one spring element is a spring element of an unlatching element and/or a locking element for unlatching and/or locking a connection between the extension element and the abrading machine. 
         [0036]    The at least one spring element preferably acts on at least one inclined surface of a clamping device for the purposes of positioning the extension element on the abrading machine so as to be substantially free from play. 
         [0037]    Provision may be made for an attachment section of the extension element and/or the attachment section of the abrading machine to comprise an injection moulded component of synthetic material or to be in the form of an injection moulded component of synthetic material. 
         [0038]    In particular, provision may be made for the motor housing and the attachment section of the motor housing to be formed together in one piece manner, and in particular for the attachment section to be a component of the motor housing. 
         [0039]    It can be expedient if the entire motor housing is in the form of a one-piece or multi-piece injection moulded component of synthetic material. 
         [0040]    The abrading machine preferably comprises a suction device which comprises a suction channel that extends from the tool head to the attachment section of the abrading machine and is preferably extendable by means of the extension element. 
         [0041]    The abrading machine preferably comprises a transmission shaft which connects the drive motor to a tool holder of the tool head for torque-transmission purposes. The transmission shaft preferably runs at least in sections thereof within the tubular bar of the holding device. 
         [0042]    The transmission shaft is preferably flexible at least in sections thereof. 
         [0043]    It can be advantageous if the tool head is connected to the holding device such as to be pivotal about one or more axes. 
         [0044]    In particular, provision may be made for an end of the transmission shaft facing the tool holder together with the tool head to be pivotal about one or more axes. 
         [0045]    A suction channel of the suction device of the handheld abrading machine and the transmission shaft preferably run together, at least in sections, in the tubular bar of the holding device of the abrading machine. 
         [0046]    To this end for example, the tubular bar can be divided in a longitudinal direction so that a partial interior space of the tubular bar serves to guide and accommodate the transmission shaft, while a further partial interior space of the tubular bar forms a suction channel section of the suction channel. 
         [0047]    The tool head of the abrading machine preferably comprises a tool holder for accommodating a tool, in particular an abrader. 
         [0048]    A tool accommodated in the tool holder can be driven in preferably rotary, oscillatory and/or eccentric manner. 
         [0049]    The tool is preferably fixable to the tool holder in releasable manner by means of a releasable connection and in particular by means of a hook and loop fastener. 
         [0050]    The drive motor is preferably arranged on a side of a central axis of the tubular bar of the holding device opposite the tool head. 
         [0051]    The abrading machine preferably comprises an engagement region formed by the tubular bar as well as a handle element that is preferably arranged on the motor housing. A user of the abrading machine can get hold of the engagement region of the tubular bar and the handle element in a particularly convenient manner and thereby work with the abrading machine for a long period of time in fatigue-free manner. 
         [0052]    Preferably, a further engagement region and in particular an engagement region formed by the tubular bar of the extension element can be formed by means of the extension element. 
         [0053]    In order to reach work surfaces that are located more distantly from a user, the user preferably grips the handle element and the engagement region of the extension element. In this case too, the user can preferably work with the abrading machine for a long period of time in fatigue-free manner. 
         [0054]    It can be advantageous if an earthing wire of the abrading machine, a tubular bar of the extension element and/or a hose that is arranged or arrangeable on the extension element, and in particular a suction hose of a suction device, are connected to one another electrically. 
         [0055]    In particular, provision may be made for suction nozzles which are arranged on the tubular bar of the abrading machine and to which the extension element is preferably fixable to be formed from an electrically conductive material and in particular from an electrically conductive synthetic material and/or be connected to an earthing wire of the abrading machine. The suction nozzle is thus preferably earthed. 
         [0056]    The extension element and in particular an attachment section of the extension element is preferably formed from an electrically conductive material and in particular from an electrically conductive synthetic material. 
         [0057]    A tubular bar of the extension element is preferably formed from an electrically conductive material and is directly connected to the attachment section of the extension element. 
         [0058]    The tubular bar of the extension element can preferably be earthed by means of the attachment section of the extension element via the earthing wire of the abrading machine. 
         [0059]    In particular, the tubular bar can be in the form of an aluminium tube. 
         [0060]    A connector device of the extension element to which in particular a suction hose of a suction device is connectible, is preferably formed from an electrically conductive material and in particular from an electrically conductive synthetic material. 
         [0061]    Preferably, the hose and in particular the suction hose of the suction device that is arrangeable on the connector device is connected in electrically conductive manner with the earthing wire of the abrading machine by means of the extension element and is thereby earthed. 
         [0062]    In particular, an unwanted static charge of the extension element and/or the hose occurring when the abrading machine is in operation can thus be preferably prevented. 
         [0063]    Further preferred features and/or advantages of the invention form the subject matter of the following description and the graphical illustration of an exemplary embodiment. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0064]      FIG. 1  shows a schematic perspective illustration of a handheld abrading machine and of an extension element that is arranged thereon, with a view to a top side of the abrading machine; 
           [0065]      FIG. 2  a schematic side view of the abrading machine including the extension element depicted in  FIG. 1 ; 
           [0066]      FIG. 3  a schematic vertical longitudinal section through the abrading machine and the extension element depicted in  FIG. 1 ; 
           [0067]      FIG. 4  an enlarged illustration of the region IV in  FIG. 3 ; 
           [0068]      FIG. 5  a schematic vertical cross section through a motor housing of the abrading machine and an attachment section of the extension element along the line  5 - 5  in  FIG. 2  as seen in the direction of the arrows; 
           [0069]      FIG. 6  a schematic perspective illustration of the abrading machine including the extension element as seen from below a lower surface of the abrading machine; 
           [0070]      FIG. 7  a schematic perspective illustration of the abrading machine corresponding to  FIG. 6  without an extension element arranged thereon; 
           [0071]      FIG. 8  an enlarged illustration of the region VIII in  FIG. 7 ; 
           [0072]      FIG. 9  a schematic perspective illustration of the extension element depicted in  FIG. 1  in the dismantled state thereof; and 
           [0073]      FIG. 10  an enlarged illustration of the region X in  FIG. 9 . 
       
    
    
       [0074]    Similar or functionally equivalent elements are provided with the same reference numbers in all the Figures. 
       DETAILED DESCRIPTION 
       [0075]    An embodiment of a handheld abrading machine which is illustrated in  FIGS. 1 to 10  and as a whole designated  100  is, for example, a long-neck abrader by means of which large surfaces and in particular wall areas, ceiling areas and floor areas are treatable in an easy and comfortable manner. 
         [0076]    The abrading machine  100  comprises a tool head  102  which comprises a tool holder  104 . 
         [0077]    A tool  106  such as an abrasive means for example can be arranged on the tool holder  104 . 
         [0078]    The tool head  102  is mounted on a holding device  110  of the abrading machine  100  in pivotal manner by means of a swivel device  108 . 
         [0079]    In connection therewith, the swivel device  108  comprises a fork element  112  and a swivel element  116  which is arranged on the fork element  112  such as to be pivotal about a pivotal axis  114 . 
         [0080]    The swivel element  116  is in the form of swivel ring  118  for example (see  FIG. 2 ). 
         [0081]    The fork element  112  is connected to a housing  120  of the tool head  102  in pivotal manner by means of the swivel ring  118 . 
         [0082]    The fork element  112 , the swivel element  116  and the housing  120  of the tool head  102  are thereby connected to one another in such a manner that the tool head  102  is pivotal relative to the fork element  112  about two pivotal axes  114  which are substantially perpendicular to one another. 
         [0083]    The holding device  110  of the abrading machine  100  comprises a tubular bar  122  which has a proximal end  124  that faces the user in the operational state, and a distal end  126  that is remote from the user in the operational state. 
         [0084]    The fork element  112  and thus the tool head  102  are arranged at the distal end  126  of the tubular bar  122  of the holding device  110 . 
         [0085]    A motor housing  128  of the abrading machine  100  is arranged at the proximal end  124  of the tubular bar  122  of the holding device  110  opposite the distal end  126 . 
         [0086]    The motor housing  128  of the abrading machine  100  serves for accommodating a drive motor  130  of the abrading machine  100 . 
         [0087]    The motor housing  128  comprises a handle element  132  by means of which a user can grip the abrading machine  100  in a particularly comfortable manner. 
         [0088]    The drive motor  130  is coupled to the tool holder  104  by means of a flexible shaft  134  so that the tool holder  104  including a tool  106  arranged thereon is drivable in particular, in rotary, oscillatory and/or eccentric manner. 
         [0089]    The flexible shaft  134  runs at least in sections thereof within the tubular bar  122 . 
         [0090]    Furthermore, the flexible shaft  134  runs at least in sections thereof in a flexible tubing element  136  by means of which the tubular bar  122  is connected to the housing  120  of the tool head  102 . 
         [0091]    Furthermore, the abrading machine  100  comprises a suction channel  138  which extends from the tool head  102  up to the proximal end  124  of the tubular bar  122  and comprises a plurality of suction channel sections  140 . 
         [0092]    In particular, the flexible tubing element  136  and the tubular bar  122  form suction channel sections  140  of the suction channel  138 . 
         [0093]    For optimal weight distribution of the abrading machine  100 , the drive motor  130  is preferably arranged on a side of a central axis  142  of the tubular bar  122  that is located opposite the tool head  102 . 
         [0094]    In the operational state of the abrading machine  100 , the user can take hold of the handle element  132  and the tubular bar  122  of the holding device  110  of the abrading machine  100  for example. 
         [0095]    The tubular bar  122  thus forms an engagement region  144  of the abrading machine  100 . 
         [0096]    If now a user places one hand on the engagement region  144  of the tubular bar  122  of the holding device  110  and takes hold of the handle element  132  with his other hand this then results in a certain radius of action within which the user can reach a surface that is to be treated by the tool head  102  from a given standing position. 
         [0097]    For the purposes of treating a high ceiling for example, this radius of action can be insufficient. 
         [0098]    An extension of the abrading machine  100  can therefore be advantageous. 
         [0099]    To this end, in the embodiment of the abrading machine  100  illustrated in  FIGS. 1 to 10 , there is provided an extension element  146  which is fixable to the abrading machine  100  and in particular to the motor housing  128  of the abrading machine  100  in releasable manner. 
         [0100]    In particular, the extension element  146  comprises a tubular bar  148  which preferably forms an extension of the tubular bar  122  of the holding device  110  of the abrading machine  100 . 
         [0101]    The tubular bar  122  of the holding device  110  and the tubular bar  148  of the extension element  146  are preferably aligned in the assembled state of the extension element  146  on the abrading machine  100  in such a way that a central axis  150  of the tubular bar  148  of the extension element  146  runs at least approximately parallel to the central axis  142  of the tubular bar  122  of the holding device  110 . 
         [0102]    In particular, provision may be made for the central axes  142 ,  150  to be at least approximately identical and thus form a common central axis of the tubular bar  122  of the holding device  110  and the tubular bar  148  of the extension element  146 . 
         [0103]    Furthermore, the extension element  146  comprises an attachment section  152  by means of which the extension element  146  is fixable to an attachment section  154  of the motor housing  128  in releasable manner. 
         [0104]    As can be derived in particular from  FIG. 8 , the attachment section  154  of the motor housing  128  is, in particular, in the form of a recess  156  or gap  158  of the motor housing  128 . 
         [0105]    The attachment section  154  comprises the proximal end  124  of the tubular bar  122  of the holding device  110  of the abrading machine  100 . 
         [0106]    A connector device  160  is arranged at the proximal end  124  of the tubular bar  122  of the holding device  110 . A (not illustrated) suction device and in particular a vacuum cleaner can be attached to this connector device  160  in order to enable dust and abraded material arising in the region of the tool head  102  in operation of the abrading machine  100  to be exhausted and disposed of through the suction channel  138 . 
         [0107]    Furthermore, the attachment section  154  of the motor housing  128  comprises a protuberance  162  which is engageable by means of the extension element  146  in order to fix the extension element  146  to the motor housing  128  of the abrading machine  100  in releasable manner. 
         [0108]    Furthermore, the protuberance  162  serves for fixing the motor housing  128  to the tubular bar  122  of the holding device  110 . 
         [0109]    Furthermore, the attachment section  154  of the motor housing  128  comprises at least one holder opening  164 . 
         [0110]    In particular, the holder opening  164  is formed between the motor housing  128  and the tubular bar  122 . 
         [0111]    The tubular bar  122  extends, in particular, through the motor housing  128 . 
         [0112]    The holder opening  164  of the attachment section  154  of the motor housing  128  serves in particular for accommodating a protuberance  166  of the extension element  146 . 
         [0113]    As can be derived in particular from  FIGS. 9 and 10 , the extension element  146  comprises an attachment section  152  by means of which the extension element  146  is arrangeable particularly in releasable manner on the attachment section  154  of the motor housing  128 . 
         [0114]    In particular, the attachment section  152  of the extension element  146  is pushable along the central axis  150  of the tubular bar  148  of the extension element  146  and/or along the central axis  142  of the tubular bar  122  of the holding device  110  of the abrading machine  100  onto the motor housing  128  of the abrading machine  100  and is connectible in releasable manner to the motor housing  128 . 
         [0115]    To this end in particular, there is provided a latching device  170  by means of which the extension element  146  is lockable to the motor housing  128 . 
         [0116]    The latching device  170  comprises two latching elements  172 . 
         [0117]    The latching elements  172  are in the form of pushbuttons  174  for example. 
         [0118]    Furthermore, the latching device  170  preferably comprises two spring elements  176 . 
         [0119]    Thereby, the spring elements  176  are preferably associated with the latching elements  172 . 
         [0120]    The latching elements  172  are thus preferably spring-loaded. 
         [0121]    The latching elements  172  each preferably comprise an inclined surface  178  which is oriented at an angle to the central axis  142  and/or to the central axis  150 . 
         [0122]    When pushing the extension element  146  onto the attachment section  154  of the motor housing  128 , the latching elements  172  are deflectable by means of the inclined surfaces  178  without special manipulation of the latching elements  172  by the user and are moveable past the protuberances  162  of the attachment section  154  of the motor housing  128 . 
         [0123]    The extension element  146  can thus be easily locked to the motor housing  128  when pushing the extension element  146  onto the attachment section  154  of the motor housing  128 . 
         [0124]    The latching elements  172  in the form of pushbuttons  174  are preferably additionally designed as unlatching elements  180 . 
         [0125]    A latching connection between the extension element  146  and the motor housing  128  formed by means of the latching device  170  can be unlatched by means of the unlatching elements  180 . The extension element  146  can then be easily removed from the motor housing  128 . 
         [0126]    As can be derived in particular from  FIG. 4 , the tubular bar  148  of the extension element  146  adjoins the connector device  160  of the tubular bar  122  of the holding device  110  of the abrading machine  100  in the assembled state of the extension element  146 . 
         [0127]    The tubular bars  148 ,  122  are thus connected to one another in fluid-conveying manner. 
         [0128]    The tubular bar  148  of the extension element  146  can thus form an extension channel  182  for the suction channel  138  of the abrading machine  100 . 
         [0129]    For example, a connection of the tubular bars  148 ,  122  can be effected by means of an adapter element  183  in such a way that no dust or abraded material can emerge between the tubular bars  148 ,  122  and also no additional ambient air can be sucked-in in this region. 
         [0130]    At an end  184  of the extension element  146  remote from the attachment section  152  of the extension element  146  and in particular at an end of the tubular bar  148  of the extension element  146 , there is preferably provided a connector device  186  to which a (not illustrated) suction device and in particular a vacuum cleaner is connectible in order to enable dust and abraded material developing in the region of the tool head  102  to be sucked through the suction channel  138  of the abrading machine  100  and the extension channel  182  of the extension element  146  and then disposed of. 
         [0131]    The attachment section  154  of the motor housing  128 , the attachment section  152  of the extension element  146 , the tubular bar  148  and/or the connector device  186  are preferably electrically conductive at least in sections thereof. In particular for the case where earthing via the suction device fails when the abrading machine  100  is in use, the suction device can preferably then be earthed by means of the extension element  146  via an earthing wire of the abrading machine  100 . This thereby effectively prevents a user from getting an electrical shock due to a static charge on the components of the abrading machine  100 . 
         [0132]    As can be derived in particular from  FIGS. 1, 2, 5 and 6 , the motor housing  128  and the attachment section  152  of the extension element  146  are formed in such a way that they complement each other to form a uniform entity. 
         [0133]    In particular, the attachment section  152  of the extension element  146  is formed in such a way that it fills out or completes the recess  156  or gap  158  of the attachment section  154  of the motor housing  128 . 
         [0134]    The motor housing  128  and the attachment section  152  of the extension element  146  are formed in such a way that the surfaces  188  of the side walls  190 , the bottom walls  192  and/or the rear walls  194  of the motor housing  128  and those of the attachment section  152  of the extension element  146  adjoin one another in such a way that they are at least approximately flush. 
         [0135]    Preferably, the surfaces  188  of the side walls  190 , the bottom wall  192  and/or the rear wall  194  of the attachment section  152  of the extension element  146  are substantially constant continuations of the surfaces  188  of the side walls  190 , the bottom wall  192  and/or the rear wall  194  of the motor housing  128 . 
         [0136]    In particular, the attachment section  152  of the extension element  146  completes an outer contour  196  of the motor housing  128 . 
         [0137]    As can be derived in particular from  FIG. 5 , the attachment section  152  of the extension element  146  is formed in such a way that, on three sides for example, it forms a section of the outer contour  196  namely, within the region of the side walls  190  and the bottom wall  192 , but preferably does not protrude beyond the side walls  190  and the bottom wall  192  of the motor housing  128  in a plane taken perpendicularly to the central axis  142  of the tubular bar  122 . 
         [0138]    The abrading machine  100  illustrated for example in  FIG. 7  can be extended by means of the extension element  146  illustrated in e.g.  FIG. 9  as follows: 
         [0139]    The extension element  146  together with its attachment section  152  are pushed along the central axes  142 ,  150  onto the attachment section  154  of the motor housing  128 . 
         [0140]    In connection therewith, due to the inclined surfaces  178 , the latching elements  172  of the latching device  170  are moved outwardly and past the protuberances  162  of the attachment section  154  of the motor housing  128  until they latch behind the protuberances  162  so that the extension element  146  is then fixed to the abrading machine  100  and in particular to the motor housing  128  of the abrading machine  100 . 
         [0141]    When pushing the extension element  146  onto the abrading machine  100 , the protuberance  166  is introduced into the holder opening  164  at the same time. In particular, tilting of the tubular bars  148 ,  122  relative to each other can be effectively prevented due to the fixing of the protuberance  166  in the holder opening  164 . 
         [0142]    Likewise, when pushing the extension element  146  onto the motor housing  128  of the abrading machine  100 , the tubular bars  148 ,  122  are positioned relative to each other and are interconnected by means of the adapter element  183  particularly in fluid-tight manner in such a way that an extension channel  182  for the suction channel  138  of the abrading machine  100  is formed by means of the extension element  146 . 
         [0143]    In the assembled state of the extension element  146  on the abrading machine  100  that is illustrated in  FIG. 1 , a user of the abrading machine  100  can reach a work area that is further away from the user with the tool head  102 . 
         [0144]    To this end, the user takes hold of the handle element  132  on the one hand and an engagement region  198  of the tubular bar  148  of the extension element  146  on the other. 
         [0145]    In particular, high ceilings can then be treated in an easy and comfortable manner by means of the extended abrading machine  100 . 
         [0146]    For the purposes of removing the extension element  146  from the motor housing  128 , the user actuates the unlatching elements  180  in the form of pushbuttons  174 . The latching elements  172  thereby disengage from the protuberances  162  on the attachment section  154  of the motor housing  128  so that the extension element  146  can be removed from the attachment section  154  of the motor housing  128  along the central axes  150 ,  142 . 
         [0147]    The abrading machine  100  is then particularly suitable for treating a nearby region and, in addition, can be particularly compactly stowed away due to the dismantled extension element  146 . 
       LIST OF REFERENCE SYMBOLS 
       [0000]    
       
           100  abrading machine 
           102  tool head 
           104  tool holder 
           106  tool 
           108  swivel device 
           110  holding device 
           112  fork element 
           114  pivotal axis 
           116  swivel element 
           118  swivel ring 
           120  housing of the tool head 
           122  tubular bar 
           124  proximal end 
           126  distal end 
           128  motor housing 
           130  drive motor 
           132  handle element 
           134  flexible shaft 
           136  flexible tubing element 
           138  suction channel 
           140  suction channel section 
           142  central axis 
           144  engagement region 
           146  extension element 
           148  tubular bar 
           150  central axis 
           152  attachment section 
           154  attachment section of the motor housing 
           156  recess 
           158  gap 
           160  connector device 
           162  protuberance 
           164  holder opening 
           166  protuberance 
           170  latching device 
           172  latching element 
           174  pushbutton 
           176  spring element 
           178  inclined surface 
           180  unlatching element 
           182  extension channel 
           183  adapter element 
           184  end 
           186  connector device 
           188  surface 
           190  side wall 
           192  bottom wall 
           194  rear wall 
           196  outer contour 
           198  engagement region