EP3016779B1 - Hand-held grinding machine - Google Patents

Description

The present invention relates to a hand-held grinding machine, in particular a so-called long-necked sander.

Hand-held grinding machines are for example from the DE 10 2005 021 153 A1 , of the WO 2008/033377 A2 or the US 2006/0073778 A1 known.

The present invention has for its object to provide a hand-held grinding machine, which allows a simple and possible fatigue-free grinding.

This object is achieved by a hand-held grinding machine according to claim 1. According to the invention it is provided that the motor housing comprises a fixing portion for detachably fixing an extension element.

Preferably, the grinding machine and / or the extension element comprises a locking device for fixing, in particular for releasably fixing, of the extension element.

Alternatively or additionally, it can be provided that the grinding machine and / or the extension element comprises a clamping device for fixing, in particular for non-positive fixing, of the extension element.

It may be favorable if the extension element can be pushed onto the fastening section of the grinding machine and / or inserted into the fastening section of the grinding machine. Preferably, the extension element can be latched by the pushing and / or insertion with the attachment portion of the grinding machine.

It may be favorable if the latching device comprises at least one unlocking element, by means of which a latching of the extension element is detachable for removing the extension element.

Preferably, the locking device comprises a plurality, for example two, unlocking elements.

For example, it can be provided that at least one unlocking element, in particular several, for example two, unlocking elements, is designed as a push button.

In particular, it can be provided that a push button is designed as a spring-loaded push button.

The latching device preferably comprises two unlocking elements designed as pushbuttons, which are arranged on opposite sides of a fastening section of the extension element and / or on opposite sides of the fastening section of the grinding machine, in particular of the motor housing, on the extension element and / or the motor housing.

In a further embodiment of the invention can be provided that the grinding machine comprises a fixing portion for releasably securing an extension member, wherein the attachment portion comprises a tool head facing away from the end of a suction channel, which extends from the tool head to the attachment portion.

It may be favorable if the extension element comprises an extension channel, which adjoins in the mounted state of the extension element on the attachment portion of the grinding machine to the tool head remote from the end of the suction channel of the grinding machine.

The attachment portion of the grinding machine preferably comprises the proximal end of the tubular rod of the grinding machine, in particular the holding device of the grinding machine.

The extension channel preferably adjoins the proximal end of the tubular rod.

It may be favorable if the extension element comprises a rigid tubular rod.

The tubular rod of the extension element preferably has at least approximately the same cross section and / or diameter as the tubular rod of the holding device of the grinding machine.

According to the invention, the grinding machine comprises an extension element which comprises a fastening section, and in that the fastening section of the grinding machine is formed as a recess or recess in the motor housing, the recess or recess being formed in the motor housing and the fastening section of the extension element being that the recess or recess in the motor housing is filled in the mounted state of the extension element on the motor housing by means of the fastening portion of the extension element.

By means of the fastening portion of the extension element according to the invention a predetermined by walls of the motor housing outer contour of the motor housing can be completed.

It can be provided that, in the mounted state of the extension element on the motor housing, an outer surface of the fastening section of the extension element adjoins substantially flush with an outer surface of walls of the motor housing. In this way, dirt-prone edges or protrusions in the transition region between the attachment portion of the extension member and the attachment portion of the motor housing can be preferably reduced or avoided altogether.

The extension element is preferably releasably connectable by means of an adapter element with the tubular rod of the grinding machine.

In particular, it can be provided that the extension element is detachably connectable to the tubular rod of the grinding machine in such a way that an interior of the extension element adjoins an interior of the tubular rod and is fluidically connected thereto.

By means of the extension element can be formed in this way an extension channel for extending a suction channel of the grinding machine.

The grinding machine preferably comprises a connecting device for connecting a suction device, for example a vacuum cleaner.

The extension element preferably adjoins the connection device of the grinding machine, in particular in the region of the fastening section of the extension element in the mounted state of the extension element on the grinding machine.

An end of the extension element facing away from the attachment section of the extension element preferably likewise has a connection device to which a suction device, in particular a vacuum cleaner, can be connected.

By means of the extension element can thus be provided a suction channel, which extends from the tool head to the connection device of the extension element.

In one embodiment of the invention can be provided that the grinding machine comprises at least one spring element by means of which the extension element in the mounted state on the grinding machine in a substantially play-free position can be locked.

The at least one spring element is in particular a spring element of an unlocking element and / or a locking element for unlocking or locking a connection between the extension element and the grinding machine.

The at least one spring element preferably acts on at least one inclined surface of a clamping device for substantially play-free positioning of the extension element on the grinding machine.

It can be provided that a fastening section of the extension element and / or the fastening section of the grinding machine comprises a plastic injection-molded component or is designed as a plastic injection-molded component.

In particular, it can be provided that the motor housing and the attachment portion of the motor housing are integrally formed with each other, in particular the attachment portion is a part of the motor housing.

It may be favorable if the entire motor housing is designed as a one-part or multi-part plastic injection-molded component.

The grinding machine preferably comprises a suction device which comprises a suction channel which extends from the tool head to the attachment portion of the grinding machine and is preferably extendible by means of the extension element.

The grinding machine preferably comprises a transmission shaft, which connects the drive motor for torque transmission with a tool holder of the tool head. The transmission shaft preferably extends at least in sections within the tubular rod of the holding device.

The transmission shaft is preferably formed at least partially flexible.

It may be advantageous if the tool head is pivotally connected to the holding device about one or more axes.

In particular, it can be provided that an end of the transmission shaft facing the tool holder can be pivoted together with the tool head about one or more axes.

A suction channel of the suction device of the hand-held grinding machine and the transmission shaft preferably extend at least in sections together in the tubular rod of the holding device of the grinding machine.

For this purpose, the tubular rod can be designed to be divided in a longitudinal direction, for example, such that a partial interior of the tubular rod serves to guide and receive the transmission shaft, while a further partial interior of the tubular rod forms a suction channel section of the suction channel.

The tool head of the grinding machine preferably comprises a tool holder for receiving a tool, in particular an abrasive.

A tool received on the tool holder can preferably be driven to rotate, oscillate and / or eccentrically.

The tool is preferably by means of a releasable connection, in particular by means of a Velcro connection, releasably secured to the tool holder.

The drive motor is preferably arranged on a side opposite the tool head side of a central axis of the tubular rod of the holding device.

The grinding machine preferably comprises an engagement region formed by the tubular rod and a gripping element preferably arranged on the motor housing. At the area of attack of the tubular rod and on the handle element, a user of the grinding machine can attack particularly comfortably and thereby work fatigue-free with the grinding machine over a long period of time.

By means of the extension element, a further engagement region, in particular an engagement region formed by the tubular rod of the extension element, can preferably be formed.

To further reach work surfaces remote from a user, the user preferably engages the handle member and the engagement area of the extension member. Also in this case, the user can preferably work fatigue-free over a long period of time with the grinding machine.

It can be advantageous if a ground conductor of the grinding machine, a tubular rod of the extension element and / or a hose which can be arranged or arranged on the extension element, in particular a suction hose of a suction device, are electrically connected to one another.

In particular, it can be provided that an exhaust pipe arranged on the tubular rod of the grinding machine, to which the extension element is preferably fixable, is formed from an electrically conductive material, in particular from an electrically conductive plastic material, and / or is connected to a ground conductor of the grinding machine. The extraction nozzle is thus preferably grounded.

The extension element, in particular a fastening section of the extension element, is preferably formed from an electrically conductive material, in particular from an electrically conductive plastic material.

A tubular rod of the extension member is preferably formed of an electrically conductive material and connected directly to the attachment portion of the extension member.

The tubular rod of the extension member may preferably be grounded by means of the attachment portion of the extension member via the earth conductor of the grinding machine.

The tubular rod may in particular be formed as an aluminum tube.

A connection device of the extension element, to which in particular a suction hose of a suction device can be connected, is preferably formed from an electrically conductive material, in particular from an electrically conductive plastic material.

Preferably, the hose which can be arranged on the connecting device, in particular the suction hose of the suction device, is electrically conductively connected to the earth conductor of the grinding machine by means of the extension element and thus earthed.

In particular, an undesirable static charge of the extension element and / or the hose during operation of the grinding machine can thus be preferably prevented.

Further preferred features and / or advantages of the invention are the subject of the following description and the drawings of an embodiment.

Fig. 1

eine schematische perspektivische Darstellung einer handgehaltenen Schleifmaschine und eines daran angeordneten Verlängerungselements, mit Blick auf eine Oberseite der Schleifmaschine;

Fig. 2

eine schematische Seitenansicht der Schleifmaschine samt des Verlängerungselements aus Fig. 1;

Fig. 3

einen schematischen vertikalen Längsschnitt durch die Schleifmaschine und das Verlängerungselement aus Fig. 1;

Fig. 4

eine vergrößerte Darstellung des Bereichs IV in Fig. 3;

Fig. 5

einen schematischen vertikalen Querschnitt durch ein Motorgehäuse der Schleifmaschine und einen Befestigungsabschnitt des Verlängerungselements längs der Linie 5-5 in Fig. 2 mit Blickrichtung in Pfeilrichtung;

Fig. 6

eine schematische perspektivische Darstellung der Schleifmaschine samt des Verlängerungselements mit Blickrichtung auf eine Unterseite der Schleifmaschine;

Fig. 7

eine der Fig. 6 entsprechende schematische perspektivische Darstellung der Schleifmaschine ohne ein daran angeordnetes Verlängerungselement;

Fig. 8

eine vergrößerte Darstellung des Bereichs VIII in Fig. 7;

Fig. 9

eine schematische perspektivische Darstellung des Verlängerungselements aus Fig. 1 im demontierten Zustand desselben; und

Fig. 10

eine vergrößerte Darstellung des Bereichs X in Fig. 9.

In the drawings show:

Fig. 1

a schematic perspective view of a hand-held grinding machine and an extension element arranged thereon, looking at an upper side of the grinding machine;

Fig. 2

a schematic side view of the grinding machine including the extension element Fig. 1 ;

Fig. 3

a schematic vertical longitudinal section through the grinding machine and the extension element Fig. 1 ;

Fig. 4

an enlarged view of the area IV in Fig. 3 ;

Fig. 5

a schematic vertical cross-section through a motor housing of the grinding machine and a mounting portion of the extension element along the line 5-5 in Fig. 2 looking in the direction of the arrow;

Fig. 6

a schematic perspective view of the grinding machine including the extension element with a view towards a bottom of the grinding machine;

Fig. 7

one of the Fig. 6 corresponding schematic perspective view of the grinding machine without an extension element arranged thereon;

Fig. 8

an enlarged view of the area VIII in Fig. 7 ;

Fig. 9

a schematic perspective view of the extension element Fig. 1 in the disassembled state of the same; and

Fig. 10

an enlarged view of the area X in Fig. 9 ,

Identical or functionally equivalent elements are provided with the same reference numerals in all figures.

One in the Fig. 1 to 10 illustrated embodiment of a designated as a whole with 100 hand-held grinding machine, for example, a long-neck sander, by means of which easily and conveniently large areas, especially wall surfaces, ceiling surfaces and bottom surfaces are machined.

The grinding machine 100 comprises a tool head 102, which comprises a tool holder 104.

At the tool holder 104, a tool 106, such as an abrasive, can be arranged.

The tool head 102 is pivotably mounted on a holding device 110 of the grinding machine 100 by means of a pivoting device 108.

The pivoting device 108 in this case comprises a fork element 112 and a pivotable about a pivot axis 114 on the fork member 112 arranged pivot member 116th

The pivoting element 116 is formed for example as a pivot ring 118 (see Fig. 2 ).

By means of the pivot ring 118, the fork element 112 is pivotally connected to a housing 120 of the tool head 102.

The fork element 112, the pivoting element 116 and the housing 120 of the tool head 102 are connected to one another in such a way that the tool head 102 can be pivoted relative to the fork element 112 about two pivot axes 114 oriented substantially perpendicular to one another.

The holding device 110 of the grinding machine 100 comprises a tubular rod 122 which has a user end facing the proximal end 124 and a user end facing away from the distal end 126 in the use state.

At the distal end 126 of the tubular rod 122 of the holding device 110, the fork element 112 and thus the tool head 102 is arranged.

At the distal end 126 opposite the proximal end 124 of the tubular rod 122 of the holding device 110, a motor housing 128 of the grinding machine 100 is arranged.

The motor housing 128 of the grinding machine 100 serves to receive a drive motor 130 of the grinding machine 100.

The motor housing 128 includes a handle member 132, on which a user can grasp the grinding machine 100 particularly comfortable.

By means of a flexible shaft 134, the drive motor 130 is coupled to the tool holder 104, so that the tool holder 104 together with a tool 106 arranged thereon can be driven in particular in a rotating, oscillating and / or eccentric manner.

The flexible shaft 134 extends at least in sections within the tubular rod 122.

Furthermore, the flexible shaft 134 extends at least in sections in a flexible tube element 136, by means of which the tubular rod 122 is connected to the housing 120 of the tool head 102.

The grinding machine 100 further includes a suction channel 138 that extends from the tool head 102 to the proximal end 124 of the tubular rod 122 and includes a plurality of suction channel sections 140.

In particular, the flexible tube member 136 and the tubular rod 122 form suction channel sections 140 of the suction channel 138.

For optimized weight distribution of the grinding machine 100, the drive motor 130 is preferably arranged on a side of a central axis 142 of the tubular rod 122 opposite the tool head 102.

In the state of use of the grinding machine 100, the user can, for example, engage the gripping element 132 and the tubular rod 122 of the holding device 110 of the grinding machine 100.

The tubular rod 122 thus forms an engagement region 144 of the grinding machine 100.

Now, when a user with one hand on the engagement portion 144 on the tubular rod 122 of the holding device 110 and with the other hand on the handle member 132 engages, so there is a certain radius of action, within which the user, starting from a predetermined standing position with the Tool head 102 can reach a surface to be machined.

For example, for handling high ceilings, this range of action may be insufficient.

An extension of the grinding machine 100 may therefore be advantageous.

In the in the FIGS. 1 to 10 illustrated embodiment of the grinding machine 100, an extension element 146 is provided for this purpose, which on the grinding machine 100, in particular on the motor housing 128 of the grinding machine 100, releasably fixed.

In particular, the extension element 146 comprises a tubular rod 148, which preferably forms an extension of the tubular rod 122 of the holding device 110 of the grinding machine 100.

The tubular rod 122 of the retainer 110 and the tubular rod 148 of the extension member 146 are preferably aligned with the grinding machine 100 when the extension member 146 is assembled such that a central axis 150 of the tubular rod 148 of the extension member 146 is at least approximately parallel to the central axis 142 of the tubular member Stabs 122 of the holding device 110 extends.

In particular, it can be provided that the central axes 142, 150 are at least approximately identical and thus form a common center axis of the tubular bar 122 of the holding device 110 and of the tubular bar 148 of the extension element 146.

The extension element 146 further comprises a fastening section 152, by means of which the extension element 146 can be releasably secured to a fastening section 154 of the motor housing 128.

In particular Fig. 8 can be seen, the mounting portion 154 of the motor housing 128 is in particular formed as a recess 156 or recess 158 of the motor housing 128.

The attachment portion 154 includes the proximal end 124 of the tubular rod 122 of the retainer 110 of the sander 100.

At the proximal end 124 of the tubular rod 122 of the holding device 110, a connection device 160 is arranged. A suction device (not shown), in particular a vacuum cleaner, can be connected to this connecting device 160 in order to be able to discharge and dispose of dust and abrasion arising in the region of the tool head 102 through the suction channel 138 during operation of the grinding machine 100.

The mounting portion 154 of the motor housing 128 further includes a projection 162 which is engageable behind by means of the extension member 146 to releasably fix the extension member 146 to the motor housing 128 of the grinding machine 100.

The projection 162 also serves to fix the motor housing 128 to the tubular rod 122 of the holding device 110.

The attachment portion 154 of the motor housing 128 further includes at least one receiving opening 164.

The receiving opening 164 is formed in particular between the motor housing 128 and the tubular rod 122.

The tubular rod 122 extends in particular through the motor housing 128.

The receiving opening 164 of the mounting portion 154 of the motor housing 128 is used in particular for receiving a projection 166 of the extension element 146.

As in particular the Figures 9 and 10 can be seen, the extension member 146 includes a mounting portion 152, by means of which the extension member 146 can be arranged on the mounting portion 154 of the motor housing 128, in particular releasably fixed.

In particular, the attachment portion 152 of the extension member 146 is slidable and detachable with the motor housing 128 along the central axis 150 of the tubular rod 148 of the extension member 146 and / or along the central axis 142 of the tubular rod 122 of the retainer 110 of the sander 100 connectable.

In particular, a latching device 170 is provided for this purpose, by means of which the extension element 146 can be latched to the motor housing 128.

The latching device 170 comprises two latching elements 172.

The locking elements 172 are formed for example as push buttons 174.

The latching device 170 preferably further comprises two spring elements 176.

The spring elements 176 are preferably associated with the locking elements 172.

The locking elements 172 are thus preferably spring-loaded.

The latching elements 172 preferably each comprise an inclined surface 178, which is aligned obliquely to the central axis 142 and / or to the central axis 150.

By means of the inclined surfaces 178, the locking elements 172 when sliding the extension member 146 on the mounting portion 154 of the motor housing 128 without special actuation of the locking elements 172 deflected by the user and the projections 162 of the mounting portion 154 of the motor housing 128 vorbebewewegbar.

When sliding the extension member 146 on the mounting portion 154 of the motor housing 128, the extension member 146 can thus be easily locked to the motor housing 128.

The latching elements 172 designed as push buttons 174 are preferably also designed as unlocking elements 180.

By means of the unlocking elements 180, a latching connection formed between the extension element 146 and the motor housing 128 by means of the latching device 170 can be unlocked. The extension member 146 can then be easily removed from the motor housing 128.

In particular Fig. 4 it can be seen, the tubular rod 148 of the extension member 146 in the assembled state of the extension member 146 to the connecting device 160 of the tubular rod 122 of the holding device 110 of the grinding machine 100 at.

The tubular rods 148, 122 are thus fluidly connected to each other.

The tubular rod 148 of the extension element 146 can thus form an extension channel 182 for the suction channel 138 of the grinding machine 100.

For example, by means of an adapter element 183, a connection of the tubular rods 148, 122 take place such that no dust or abrasion escapes between the tubular rods 148, 122 and in this area no additional ambient air can be sucked in.

On a side facing away from the attachment portion 152 of the extension member 146 end 184 of the extension member 146, in particular the tubular rod 148 of the extension member 146, a connecting device 186 is preferably provided, to which a (not shown) suction device, in particular a vacuum cleaner, can be connected to in the area dust and abrasion resulting from the tool head 102 through the suction channel 138 of the grinding machine 100 and the extension channel 182 of the extension element 146 can be sucked off and disposed of.

The attachment portion 154 of the motor housing 128, the attachment portion 152 of the extension member 146, the tubular rod 148 and / or the connecting device 186 are preferably at least partially electrically conductive. In particular, in the event that a grounding via the suction device fails in the operation of the grinding machine 100, the suction device can then be grounded preferably by means of the extension element 146 via a ground conductor of the grinding machine 100. As a result, it can be effectively prevented that a user gets an electric shock by static charge of the components of the grinding machine 100.

As in particular the Fig. 1 . 2 . 5 and 6 it can be seen, the motor housing 128 and the mounting portion 152 of the extension member 146 are formed so that they complement each other to a uniform overall shape.

In particular, the attachment portion 152 of the extension member 146 is configured to fill or complete the recess 156 or recess 158 of the attachment portion 154 of the motor housing 128.

The motor housing 128 and the mounting portion 152 of the extension member 146 are formed so that surfaces 188 of side walls 190, bottom walls 192 and / or rear walls 194 of the motor housing 128 and the mounting portion 152 of the extension member 146 at least approximately flush with each other.

Preferably, the surfaces 188 of the side walls 190, the bottom wall 192 and / or the rear wall 194 of the mounting portion 152 of the extension member 146 are substantially constant continuations of the surfaces 188 of the side walls 190, bottom wall 192 and / or rear wall 194 of the motor housing 128.

The fastening section 152 of the extension element 146 in particular supplements an outer contour 196 of the motor housing 128.

In particular Fig. 5 it can be seen, the attachment portion 152 of the extension member 146 is formed so that it forms, for example, three sides, namely in the region of the side walls 190 and the bottom wall 192, a portion of the outer contour 196, but preferably in a direction perpendicular to the central axis 142 of the tubular rod 122nd taken plane does not protrude beyond the side walls 190 and the bottom wall 192 of the motor housing 128.

• Das Verlängerungselement 146 wird mit seinem Befestigungsabschnitt 152 längs der Mittelachsen 142, 150 auf den Befestigungsabschnitt 154 des Motorgehäuses 128 aufgeschoben.

The example in Fig. 7 illustrated grinding machine 100 can by means of, for example, in Fig. 9 shown extension element 146 are extended as follows:

• The extension element 146 is pushed with its attachment portion 152 along the central axes 142, 150 on the mounting portion 154 of the motor housing 128.

The locking elements 172 of the latching device 170 are thereby moved due to the inclined surfaces 178 outwardly and the projections 162 of the mounting portion 154 of the motor housing 128 until they engage behind the projections 162 and thus the extension member 146 on the grinding machine 100, in particular on the motor housing 128 of Grinding machine 100, is set.

When the extension element 146 is pushed onto the grinding machine 100, the projection 166 is also inserted into the receiving opening 164. In particular, a tilting of the tubular rods 148, 122 relative to one another can be effectively prevented by the fixing of the projection 166 in the receiving opening 164.

Likewise, when the extension element 146 is pushed onto the motor housing 128 of the grinding machine 100, the tubular rods 148, 122 are positioned relative to one another and connected to each other by means of the adapter element 183, in particular in a fluid-tight manner, by means of the extension element 146 an extension channel 182 for the suction channel 138 of the grinding machine 100 is formed.

In the in Fig. 1 As shown in the illustrated assembled state of the extension member 146 on the grinding machine 100, a user of the grinding machine 100 with the tool head 102 can reach a working area farther away from the user.

For this purpose, the user acts, on the one hand, on the grip element 132 and, on the other hand, on an engagement region 198 on the tubular rod 148 of the extension element 146.

In particular, high ceilings can then be easily and conveniently processed by means of the extended grinding machine 100.

To remove the extension member 146 from the motor housing 128, the user actuates the unlocking members 180 formed as pushbuttons 174. The latching members 172 thereby disengage the projections 162 on the mounting portion 154 of the motor housing 128 such that the extension member 146 is along the central axes 150, 142 can be removed from the mounting portion 154 of the motor housing 128.

The grinding machine 100 is then particularly suitable for processing a near area and can also be stowed particularly compact by the disassembled extension element 146.

LIST OF REFERENCE NUMBERS

100

grinding machine

102

tool head

104

tool holder

106

Tool

108

swivel device

110

holder

112

fork member

114

swivel axis

116

pivoting element

118

swivel

120

Housing of the tool head

122

tubular rod

124

proximal end

126

distal end

128

motor housing

130

drive motor

132

handle element

134

flexible shaft

136

flexible pipe element

138

suction

140

Absaugkanalabschnitt

142

central axis

144

attack range

146

extension element

148

tubular rod

150

central axis

152

attachment section

154

Attachment section of the motor housing

156

recess

158

recess

160

connection device

162

head Start

164

receiving opening

166

head Start

170

locking device

172

locking element

174

push-button

176

spring element

178

sloping surface

180

unlocking

182

extension channel

183

adapter element

184

The End

186

connection device

188

surface

190

sidewall

192

bottom wall

194

rear wall

196

outer contour

198

attack range

Claims (13)

1. A handheld abrading machine (100) comprising a holding device (110) for holding the abrading machine (100), a drive motor (130), a motor housing (128) for the drive motor (130) and a tool head (102),
   wherein the holding device (110) comprises a substantially tubular bar (122) which has a proximal end (124) and a distal end (126),
   wherein the motor housing (128) and the drive motor (130) arranged therein are arranged at the proximal end (124), and
   wherein the tool head (102) is arranged at the distal end (126),
   wherein the motor housing (128) comprises an attachment section (154) for fixing an extension element (146) in releasable manner,
   wherein the abrading machine (100) comprises an extension element (146) which comprises an attachment section (152),
   wherein the attachment section (154) of the abrading machine (100) is in the form of a recess (158) or gap (156) in the motor housing (128), wherein the recess (158) or gap (156) in the motor housing (128) and the attachment section (152) of the extension element (146) are formed in such a manner that the recess (158) or gap (156) in the motor housing (128) are filled by means of the attachment section (152) of the extension element (146) in the assembled state of the extension element (146) on the motor housing (128),
   characterized in that
   an outer contour (196) of the motor housing (128) defined by walls of the motor housing (128) is completable by means of the attachment section (152) of the extension element (146).
2. An abrading machine (100) in accordance with Claim 1, characterized in that the abrading machine (100) comprises an attachment section (154) for positively fixing an extension element (146) in releasable manner.
3. An abrading machine (100) in accordance with Claim 2, characterized in that the abrading machine (100) and/or the extension element (146) comprises a latching device (170) for fixing the extension element (146) in releasable manner, wherein the extension element (146) preferably is pushable onto the attachment section (154) of the abrading machine (100) and/or is insertable into the attachment section (154) of the abrading machine (100) and is thereby lockable.
4. An abrading machine (100) in accordance with claim 3, characterized in that the latching device (170) comprises at least one unlatching element (180) by means of which locking of the extension element (146) is releasable for the purposes of removing the extension element (146), wherein at least one unlatching element (180) preferably is in the form of a pushbutton (174), wherein the latching device (170) preferably comprises two unlatching elements (180) in the form of pushbuttons (174) which are arranged on mutually opposite sides of an attachment section (152) of the extension element (146) and/or on mutually opposite sides of the attachment section (154) of the abrading machine (100).
5. An abrading machine (100) in accordance with any of the Claims 1 to 4, characterized in that the abrading machine (100) comprises an attachment section (154) for fixing an extension element (146) in releasable manner, wherein the attachment section (154) comprises an end (184) of a suction channel (138) which is remote from the tool head (102), said suction channel extending from the tool head (102) up to the attachment section (154).
6. An abrading machine (100) in accordance with Claim 5, characterized in that the extension element (146) comprises an extension channel (182) which joins the attachment section (154) of the abrading machine (100) at the end (184) of the suction channel (138) of the abrading machine (100) remote from the tool head (102) in the assembled state of the extension element (146).
7. An abrading machine (100) in accordance with either of the Claims 5 or 6, characterized in that the attachment section (154) of the abrading machine (100) comprises the proximal end (124) of the tubular bar (122).
8. An abrading machine (100) in accordance with any of the Claims 1 to 7, characterized in that the extension element (146) comprises a tubular bar (148).
9. An abrading machine (100) in accordance with either of the Claims 1 or 8, characterized in that an outer surface (188) of the attachment section (152) of the extension element (146) is substantially flush with an outer surface (188) of walls (190, 192, 194) of the motor housing (128) in the assembled state of the extension element (146) on the motor housing (128).
10. An abrading machine (100) in accordance with any of the Claims 1 to 9, characterized in that the extension element (146) is connectible to the tubular bar (122) of the abrading machine (100) in releasable manner by means of an adapter element (183), wherein the extension element (146) preferably is connectible to the tubular bar (122) of the abrading machine (100) in releasable manner in such a way that an interior space of the extension element (146) joins an interior space of the tubular bar (122) and is connected thereto in fluid-conveying manner.
11. An abrading machine (100) in accordance with any of the Claims 1 to 10, characterized in that the abrading machine (100) comprises at least one spring element (176) by means of which the extension element (146) is lockable in a position substantially free from play in the assembled state.
12. An abrading machine (100) in accordance with any of the Claims 1 to 11, characterized in that an attachment section (152) of the extension element (146) and/or the attachment section (154) of the abrading machine (100) comprises an injection moulded component of synthetic material or is in the form of an injection moulded component of synthetic material.
13. An abrading machine (100) in accordance with any of the Claims 1 to 12, characterized in that an earthing wire of the abrading machine (100), a tubular bar (148) of the extension element (146) and/or a hose, and in particular a suction hose of a suction device which is arrangeable on the extension element (146), are connected to one another electrically.

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