DE102013213271A1 - Hand held grinding machine - Google Patents

Abstract

A hand-held grinding machine comprising a holding device for holding the grinding machine, a drive motor, a motor housing for the drive motor and a tool head, wherein the holding device comprises a substantially tubular rod which has a proximal end and a distal end, the motor housing and the arranged therein drive motor are arranged at the proximal end and wherein the tool head is arranged at the distal end to provide, which allows easy and fatigue-free as possible grinding, it is proposed that the motor housing comprises a fixing portion for releasably securing an extension element.

Description

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

A hand-held grinder is for example from the DE 10 2005 021 153 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 comprising a holding device for holding the grinding machine, a drive motor, a motor housing for the drive motor and a tool head, wherein the holding device comprises a substantially tubular rod which has a proximal end and a distal end, wherein the motor housing and the drive motor disposed therein are disposed at the proximal end, and wherein the tool head is disposed at the distal end.

In one embodiment of the invention is also provided that the motor housing comprises a mounting portion for releasably securing an extension member.

It may be favorable if the grinding machine comprises an extension element. However, it can also be provided that the extension element is a separate element from the grinding machine. Preferably, a combination of a grinding machine and an extension element is then provided.

An extension element is in particular an extension of the holding device for holding the grinding machine, so that preferably a user of the grinding machine with the tool head of the grinding machine can reach a working area further away from it.

In a further embodiment of the invention can be provided that the grinding machine comprises a fixing portion for releasably form-fitting fixing an extension member.

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 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.

In one embodiment of the invention, it can be provided that the grinding machine comprises an extension element which comprises a fastening portion, and that the fastening portion of the grinding machine is formed as a recess or recess in the motor housing, wherein the recess or recess in the motor housing and the attachment portion of the Extension member are formed such that the recess or recess in the motor housing is filled in the assembled state of the extension member to the motor housing by means of the attachment portion of the extension member.

By means of the fastening portion of the extension element, in particular 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.

In the drawings show:

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;

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

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

4 an enlarged view of the area IV in 3 ;

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 2 looking in the direction of the arrow;

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

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

8th an enlarged view of the area VIII in 7 ;

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

10 an enlarged view of the area X in 9 ,

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

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

The grinding machine 100 includes a tool head 102 which is a tool holder 104 includes.

At the tool holder 104 can be a tool 106 , For example, an abrasive can be arranged.

The tool head 102 is by means of a swivel device 108 pivotable on a holding device 110 the grinding machine 100 stored.

The swivel device 108 includes a fork element 112 and a pivotable about a pivot axis 114 on the fork element 112 arranged pivoting element 116 ,

The pivoting element 116 is for example as a swivel ring 118 trained (see 2 ).

By means of the swivel ring 118 is the fork element 112 with a housing 120 of the tool head 102 pivotally connected.

The fork element 112 , the pivoting element 116 and the case 120 of the tool head 102 are connected together in such a way that the tool head 102 relative to the fork element 112 about two substantially perpendicular to each other aligned pivot axes 114 is pivotable.

The holding device 110 the grinding machine 100 comprises a tubular rod 122 which is a user-facing proximal end 124 and a user-facing away from the user, distal end 126 having.

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

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

The motor housing 128 the grinding machine 100 serves to accommodate a drive motor 130 the grinding machine 100 ,

The motor housing 128 includes a handle element 132 at which a user grinds the machine 100 especially comfortable.

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

The flexible shaft 134 runs at least in sections within the tubular rod 122 ,

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

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

In particular, form the flexible tube element 136 and the tubular rod 122 Absaugkanalabschnitte 140 of the suction channel 138 ,

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

In the state of use of the grinding machine 100 For example, the user may be attached to the grip element 132 and on the tubular rod 122 the holding device 110 the grinding machine 100 attack.

The tubular rod 122 thus forms an attack area 144 the grinding machine 100 ,

If now a user with one hand on the attack area 144 on the tubular rod 122 the holding device 110 and with the other hand on the handle element 132 engages, so there is a certain radius of action, within which the user, starting from a predetermined position, with the tool head 102 can reach a surface to be processed.

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

An extension of the grinder 100 may therefore be advantageous.

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

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

The tubular rod 122 the holding device 110 and the tubular rod 148 of the extension element 146 are preferably in the assembled state of the extension element 146 at the grinding machine 100 aligned so that a central axis 150 of the tubular rod 148 of the extension element 146 at least approximately parallel to the central axis 142 of the tubular rod 122 the holding device 110 runs.

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

The extension element 146 further comprises a fixing portion 152 , by means of which the extension element 146 at a mounting portion 154 of the motor housing 128 is releasably fixed.

In particular 8th it can be seen, is the attachment section 154 of motor housing 128 especially as a recess 156 or recess 158 of the motor housing 128 educated.

The attachment section 154 includes the proximal end 124 of the tubular rod 122 the holding device 110 the grinding machine 100 ,

At the proximal end 124 of the tubular rod 122 the holding device 110 is a connection device 160 arranged. To this connection device 160 For example, a suction device (not shown), in particular a vacuum cleaner, can be connected in order to operate during the grinding machine 100 in the area of the tool head 102 resulting dust and abrasion through the suction channel 138 through to dissipate and dispose of.

The attachment section 154 of the motor housing 128 also includes a projection 162 , which by means of the extension element 146 is graspable to the extension element 146 detachable on the motor housing 128 the grinding machine 100 set.

The lead 162 also serves to define the motor housing 128 on the tubular rod 122 the holding device 110 ,

The attachment section 154 of the motor housing 128 further comprises at least one receiving opening 164 ,

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

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

The receiving opening 164 of the attachment section 154 of the motor housing 128 in particular serves to receive a projection 166 of the extension element 146 ,

As in particular the 9 and 10 can be seen, comprises the extension element 146 a fixing section 152 , by means of which the extension element 146 at the attachment portion 154 of the motor housing 128 can be arranged, in particular releasably fixed.

The attachment section 152 of the extension element 146 is in particular along the central axis 150 of the tubular rod 148 of the extension element 146 and / or along the central axis 142 of the tubular rod 122 the holding device 110 the grinding machine 100 on the motor housing 128 the grinding machine 100 slidable and detachable with the motor housing 128 connectable.

In particular, this is a locking device 170 provided, by means of which the extension element 146 with the motor housing 128 is latched.

The locking device 170 includes two locking elements 172 ,

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

Preferably, the locking device comprises 170 also two spring elements 176 ,

The spring elements 176 are preferably the locking elements 172 assigned.

The locking elements 172 are thus preferably spring loaded.

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

By means of the inclined surfaces 178 are the locking elements 172 when sliding the extension element 146 on the attachment section 154 of the motor housing 128 without special operation of the locking elements 172 deflectable by the user and at the projections 162 of the attachment section 154 of the motor housing 128 moved past.

When sliding the extension element 146 on the attachment section 154 of the motor housing 128 can the extension element 146 thus easy on the motor housing 128 be locked.

The as push buttons 174 trained locking elements 172 are preferably further than unlocking 180 educated.

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

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

The tubular bars 148 . 122 are thus connected to one another in a fluid-efficient manner.

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

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

At one the attachment section 152 of the extension element 146 opposite end 184 of the extension element 146 , in particular of the tubular rod 148 of the extension element 146 , is preferably a connection device 186 provided, on which a (not shown) suction device, in particular a vacuum cleaner, can be connected to in the region of the tool head 102 resulting dust and abrasion through the suction channel 138 the grinding machine 100 and the extension channel 182 of the extension element 146 aspirate and dispose of.

The attachment section 154 of the motor housing 128 , the fastening section 152 of the extension element 146 , the tubular rod 148 and / or the connection device 186 are preferably at least partially formed electrically conductive. Especially in the event that during operation of the grinding machine 100 a grounding via the suction device fails, the suction device can then preferably by means of the extension element 146 over a ground wire of the grinder 100 be grounded. This can effectively prevent a user by static charge of the components of the grinding machine 100 gets an electric shock.

As in particular the 1 . 2 . 5 and 6 it can be seen, are the motor housing 128 and the attachment section 152 of the extension element 146 designed so that they complement each other to a uniform overall form.

In particular, the attachment portion 152 of the extension element 146 designed so that he has the recess 156 or recess 158 of the attachment section 154 of the motor housing 128 completes or completes.

The motor housing 128 and the attachment section 152 of the extension element 146 are designed so that surfaces 188 from side walls 190 , Floor walls 192 and / or back walls 194 of the motor housing 128 and the attachment section 152 of the extension element 146 at least approximately flush with each other.

Preferably, the surfaces are 188 the side walls 190 , the bottom wall 192 and / or the back wall 194 of the attachment section 152 of the extension element 146 essentially constant continuations of the surfaces 188 the side walls 190 , the bottom wall 192 and / or the back wall 194 of the motor housing 128 ,

The attachment section 152 of the extension element 146 especially complements an outer contour 196 of the motor housing 128 ,

In particular 5 it can be seen, is the attachment section 152 of the extension element 146 designed so that this example three-sided, namely in the side walls 190 and the bottom wall 192 , a section of the outer contour 196 forms, but preferably in a direction perpendicular to the central axis 142 of the tubular rod 122 not taken over the side walls 190 and the bottom wall 192 of the motor housing 128 protrudes.

The example in 7 illustrated grinding machine 100 can by means of example in 9 illustrated extension element 146 be extended as follows:
The extension element 146 comes with its attachment section 152 along the central axis 142 . 150 on the attachment section 154 of the motor housing 128 postponed.

The locking elements 172 the locking device 170 are due to the inclined surfaces 178 to the outside and at the projections 162 of the attachment section 154 of the motor housing 128 Moved past this until behind the projections 162 engage and thus the extension element 146 at the grinding machine 100 , in particular on the motor housing 128 the grinding machine 100 , is determined.

When sliding the extension element 146 on the grinder 100 becomes the lead at the same time 166 in the receiving opening 164 introduced. In particular, a tilting of the tubular rods 148 . 122 relative to each other can by fixing the projection 166 in the receiving opening 164 effectively prevented.

Also when pushing the extension element 146 on the motor housing 128 the grinding machine 100 become the tubular rods 148 . 122 so positioned relative to each other and by means of the adapter element 183 , in particular fluid-tight, connected to each other, that by means of the extension element 146 an extension channel 182 for the suction channel 138 the grinding machine 100 is formed.

In the in 1 illustrated assembled state of the extension element 146 at the grinding machine 100 can a user of the grinder 100 with the tool head 102 reach a working area further away from the user.

For this purpose, the user accesses the handle element on the one hand 132 and on the other hand at an attack area 198 on the tubular rod 148 of the extension element 146 at.

In particular, high ceilings can then easily and conveniently by means of the extended grinder 100 to be edited.

To remove the extension element 146 from the motor housing 128 The user presses the as push buttons 174 trained unlocking elements 180 , The locking elements 172 thereby reach with the projections 162 at the attachment portion 154 of the motor housing 128 out of engagement, so that the extension element 146 along the central axis 150 . 142 from the attachment section 154 of the motor housing 128 can be removed.

The grinding machine 100 is then particularly suitable for processing a short-range and can also by the dismantled extension element 146 stowed particularly compact.

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

QUOTES INCLUDE IN THE DESCRIPTION

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

Cited patent literature

• DE 102005021153 A1 [0002]

Claims (19)

Hand-held grinding machine ( 100 ), comprising a holding device ( 110 ) for holding the grinding 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 ) a substantially tubular rod ( 122 ) which has a proximal end ( 124 ) and a distal end ( 126 ), wherein the motor housing ( 128 ) and the drive motor ( 130 ) at the proximal end ( 124 ) and wherein the tool head ( 102 ) at the distal end ( 126 ), characterized in that the motor housing ( 128 ) an attachment portion ( 154 ) for detachably fixing an extension element ( 146 ). Grinding machine ( 100 ) according to claim 1 or according to the preamble of claim 1, characterized in that the grinding machine ( 100 ) an attachment portion ( 154 ) for the releasable positive fixing of an extension element ( 146 ). Grinding machine ( 100 ) according to claim 2, characterized in that the grinding machine ( 100 ) and / or the extension element ( 146 ) a locking device ( 170 ) for detachably fixing the extension element ( 146 ). Grinding machine ( 100 ) according to claim 3, characterized in that the extension element ( 146 ) on the attachment section ( 154 ) of the grinding machine ( 100 ) and / or in the attachment section ( 154 ) of the grinding machine ( 100 ) can be inserted and thereby latched. Grinding machine ( 100 ) according to one of claims 3 or 4, characterized in that the latching device ( 170 ) at least one unlocking element ( 180 ) by means of which for removing the extension element ( 146 ) a latching of the extension element ( 146 ) is solvable. Grinding machine ( 100 ) according to claim 5, characterized in that at least one unlocking element ( 180 ) as a push button ( 174 ) is trained. Grinding machine ( 100 ) according to claim 6, characterized in that the latching device ( 170 ) two as pushbuttons ( 174 ) formed unlocking elements ( 180 ), which on opposite sides of a fastening portion ( 152 ) of the extension element ( 146 ) and / or on opposite sides of the mounting portion ( 154 ) of the grinding machine ( 100 ) are arranged. Grinding machine ( 100 ) according to one of claims 1 to 7 or according to the preamble of claim 1, characterized in that the grinding machine ( 100 ) an attachment portion ( 154 ) for detachably fixing an extension element ( 146 ), wherein the attachment portion ( 154 ) to the tool head ( 102 ) opposite end ( 184 ) of a suction channel ( 138 ) extending from the tool head ( 102 ) up to the attachment section ( 154 ). Grinding machine ( 100 ) according to claim 8, characterized in that the extension element ( 146 ) an extension channel ( 182 ), which in the assembled state of the extension element ( 146 ) at the attachment portion ( 154 ) of the grinding machine ( 100 ) to the tool head ( 102 ) opposite end ( 184 ) of the suction channel ( 138 ) of the grinding machine ( 100 ). Grinding machine ( 100 ) according to one of claims 8 or 9, characterized in that the fixing portion ( 154 ) of the grinding machine ( 100 ) the proximal end ( 124 ) of the tubular rod ( 122 ). Grinding machine ( 100 ) according to one of claims 1 to 10, characterized in that the extension element ( 146 ) a tubular rod ( 148 ). Grinding machine ( 100 ) according to one of claims 1 to 11, characterized in that the grinding machine ( 100 ) an extension element ( 146 ) comprising a fixing section ( 152 ), and that the attachment portion ( 154 ) of the grinding machine ( 100 ) as a recess ( 158 ) or recess ( 156 ) in the motor housing ( 128 ) is formed, wherein the recess ( 158 ) or recess ( 156 ) in the motor housing ( 128 ) and the attachment section ( 152 ) of the extension element ( 146 ) are formed such that the recess ( 158 ) or recess ( 156 ) in the motor housing ( 128 ) in the assembled state of the extension element ( 146 ) on the motor housing ( 128 ) by means of the attachment section ( 152 ) of the extension element ( 146 ) is filled out. Grinding machine ( 100 ) according to claim 12, characterized in that by means of the fastening portion ( 152 ) of the extension element ( 146 ) one through walls of the motor housing ( 128 ) predetermined outer contour ( 196 ) of the motor housing ( 128 ) is complete. Grinding machine ( 100 ) according to one of claims 12 or 13, characterized in that an outer surface ( 188 ) of the attachment section ( 152 ) of the extension element ( 146 ) in the assembled state of the extension element ( 146 ) on the motor housing ( 128 ) substantially flush with an outer surface ( 188 ) of walls ( 190 . 192 . 194 ) of the motor housing ( 128 ). Grinding machine ( 100 ) according to one of claims 1 to 14, characterized in that the extension element ( 146 ) by means of an adapter element ( 183 ) with the tubular rod ( 122 ) of the grinding machine ( 100 ) is releasably connectable. Grinding machine ( 100 ) according to claim 15, characterized in that the extension element ( 146 ) in such a way with the tubular rod ( 122 ) of the grinding machine ( 100 ) is detachably connectable, that an interior of the extension element ( 146 ) to an interior of the tubular rod ( 122 ) and fluidly connected thereto. Grinding machine ( 100 ) according to one of claims 1 to 16, characterized in that the grinding machine ( 100 ) at least one spring element ( 176 ), by means of which the extension element ( 146 ) is locked in the assembled state in a substantially play-free position. Grinding machine ( 100 ) according to one of claims 1 to 17, characterized in that a fixing section ( 152 ) of the extension element ( 146 ) and / or the attachment section ( 154 ) of the grinding machine ( 100 ) comprises a plastic injection-molded component or is designed as a plastic injection-molded component. Grinding machine ( 100 ) according to one of claims 1 to 18, characterized in that a ground conductor of the grinding machine ( 100 ), a tubular rod ( 148 ) of the extension element ( 146 ) and / or on the extension element ( 146 ) Anordenbarer hose, in particular a suction hose of a suction device, are electrically connected together.

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