CN105307816A - Hand-held grinding machine - Google Patents

Abstract

The present invention relates to a handheld grinder, comprising: a holding device for holding the grinder, a drive motor, a motor housing for the drive motor, and a cutting head, wherein the holding device includes a substantially tubular rod portion having a proximal end and a distal end, wherein the motor housing and the drive motor disposed therein are located at the proximal end and wherein the cutting head is located at the distal end. In order to provide such a grinder that enables simple and effortless grinding, it is proposed that the motor housing include a fixing section for releasably securing an extension member.

Description

Hand Grinder

technical field

The present invention relates to a hand-held grinder, in particular a so-called long shaft grinder.

Background technique

Such a handheld grinder is known, for example, from patent application DE 10 2005 021 153 A1.

Contents of the invention

The object of the present invention is to provide a hand-held grinder which permits simple and as effortless grinding as possible.

This object is achieved by a hand-held grinder comprising: a holding device for holding the grinder, a drive motor, a motor housing of the drive motor and a cutter head, wherein the holding device comprises a substantially tubular shaft , the tubular shaft portion includes 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 cutter head is disposed at the distal end.

In one refinement of the invention it is additionally provided that the motor housing includes a fastening section for releasably fastening the extension part.

It is advantageous when the grinder comprises an extension part. However, it can also be provided that the extension part is a separate part from the grinder. Preferably, therefore, a combination of grinder and extension is provided.

The extension part serves in particular as an extension of the holding part for holding the grinder, so that a user of the grinder can preferably access a working area remote from the user via the cutter head of the grinder.

In another refinement of the invention it is provided that the grinder comprises a fastening section for releasably positive fastening of the extension part.

Preferably, the grinder and/or the extension part comprise locking means for fixing, in particular for releasably fixing the extension part.

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

It is advantageous if the extension part can be pushed onto and/or into the fastening section of the grinder. Preferably, the extension part can be locked with the fixed section of the grinder by pushing and/or pushing in.

It is advantageous for the locking device to comprise at least one unlocking part, by means of which the locking of the extension part can be released in order to remove the extension part.

Preferably, the locking device comprises a plurality (eg two) of unlocking members.

For example, it can be provided that at least one unlocking element, in particular a plurality (for example two) of unlocking elements, is configured as a button.

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

The locking device preferably comprises two unlocking parts configured as buttons, which are arranged at the extension part and/or at the motor housing on opposite sides of the fixing section of the extension part and/or at the grinding machine The mutually opposite sides of the fastening section of (in particular of the motor housing).

In a further embodiment of the invention it is provided that the grinder comprises a fastening section for releasably fastening the extension part, wherein the fastening section comprises the end of the suction channel facing away from the tool head, the suction A channel extends from the tool head to the fastening section.

It is advantageous if the extension part comprises an extension channel which, in the assembled state of the extension part on the fastening section of the grinder, opens at the end of the suction channel of the grinder remote from the cutter head.

The stationary section of the grinder preferably comprises the proximal end of the tubular shaft of the grinder, in particular of the grinder holder.

The elongate channel preferably adjoins the proximal end of the tubular shaft.

It is advantageous when the extension member comprises a rigid tubular shaft.

The tubular shaft of the extension part preferably has at least approximately the same cross-section and/or diameter as the tubular shaft of the holding device of the grinder.

In one configuration of the invention it can be provided that the grinder comprises an extension with a fastening section and that the fastening section of the grinder is formed as a recess or recess in the motor housing, wherein the motor housing This recess or gap in the extension part and the fixing section of the extension part are configured in such a way that, in the state where the extension part is fitted on the motor housing, the recess in the motor housing is filled by the fixing section of the extension part. Groove or void.

In particular, the outer contour of the motor housing predetermined by the motor housing wall can be completed by means of the fastening section of the extension part.

It can be provided that, in the mounted state of the extension part on the motor housing, the outer surface of the fastening section of the extension part is substantially flush with the outer surface of the motor housing wall. In this way, dirt-prone edges or protrusions in the transition region between the fastening section of the extension part and the fastening section of the motor housing can preferably be reduced or completely avoided.

The extension part is preferably releasably connectable to the tubular shaft of the grinder by means of an adapter part.

It can in particular be provided that the extension part is releasably connected to the tubular shaft of the mill in such a way that the interior of the extension part communicates with the interior of the tubular shaft and is fluid-permeably connected thereto.

An extension channel for extending the suction channel of the grinder can be formed in this way by means of the connecting element.

The grinder preferably comprises connection means for connection of a suction device, for example a vacuum cleaner.

The extension preferably adjoins the connection device of the grinding machine, in particular in the region of the fastening section of the extension when the extension is fitted to the grinding machine.

The end of the extension part remote from the extension part fastening section preferably also has a connection device, to which a suction device, in particular a vacuum cleaner, can be connected.

A suction channel can thus be provided by means of the extension part, which extends from the tool head as far as the connecting device of the extension part.

In one refinement of the invention it can be provided that the grinder comprises at least one spring element, by means of which the extension part can be locked in an essentially play-free position on the grinder in the assembled state.

The at least one spring part is in particular a spring part of an unlocking part and/or a locking part for unlocking or blocking the connection between the grinder and the extension part.

The at least one spring element preferably acts on at least one ramp of the clamping device for the substantially play-free positioning of the extension element on the grinder.

It can be provided that the fastening section of the extension part and/or the fastening section of the grinder comprises an injection-molded component or is formed as an injection-molded component.

In particular, it can be provided that the motor housing and the fastening section of the motor housing are formed in one piece with one another, in particular that the fastening section is formed as a component part of the motor housing.

It is advantageous if the entire motor housing is designed as a one-piece or multi-part plastic injection-molded part.

The grinding machine preferably comprises a suction device which comprises a suction channel which extends from the cutter head to the fastening section of the grinding machine and which can preferably be extended by means of an extension element.

The grinder preferably includes a drive shaft, which connects the drive motor to the tool receptacle of the tool head for torque transmission. The drive shaft preferably extends at least in sections within the tubular shaft of the holding device.

The drive shaft is preferably of at least section-wise flexible design.

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

In particular it can be provided that the end of the drive shaft close to the tool receptacle is rotatable together with the tool head about one or more axes.

The suction channel of the suction device of the hand-held grinder and the drive shaft preferably jointly extend at least in sections in the tubular shaft of the holding device of the grinder.

In this regard, the tubular shaft is, for example, formed separately in the longitudinal direction, so that part of the interior space of the tubular shaft is used for guiding and receiving the drive shaft, while another part of the interior space of the tubular shaft forms the suction channel of the suction channel. Channel section.

The tool head of the grinding machine preferably comprises a tool receptacle for receiving a tool, in particular a grinding device.

The tool received on the tool receptacle can preferably be driven rotationally, vibratingly and/or eccentrically.

The tool can preferably be releasably fastened to the tool receptacle by means of a releasable connection, in particular by means of a Velcro connection.

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

The grinder preferably comprises a grip area formed by the tubular shaft and a handle part preferably provided on the motor housing. The user of the grinder can particularly conveniently grip the grip area of the tubular shaft and the handle part, and thus be able to work with the grinder for extended periods of time without effort.

An additional grip area can preferably be formed by the extension part, in particular by the tubular shaft of the extension part.

In order to reach the work surface remote from the user, the user preferably grips on the gripping regions of the handle part and the extension part. In this case, too, the user can preferably work with the grinder effortlessly for a long time.

It is advantageous if the ground line of the grinder, the tubular shaft of the extension and/or a hose that can be provided or is provided on the extension, in particular a suction hose of the suction device, is electrically connected to one another.

In particular, it can be provided that the suction pipe sleeve arranged on the tubular shaft of the grinder, to which the extension part can preferably be fastened, consists of an electrically conductive material, in particular an electrically conductive plastic material, and /or to the ground wire of the grinder. The suction sleeve is therefore preferably grounded.

The extension part, in particular the fastening section of the extension part, preferably consists of an electrically conductive material, in particular an electrically conductive plastic material.

The tubular shaft of the extension part preferably consists of an electrically conductive material and is directly connected to the fastening section of the extension part.

The tubular shaft of the extension can preferably be grounded by means of the fixing section of the extension, via the ground wire of the grinder.

The tubular shaft can in particular be configured as an aluminum tube.

The connection device of the extension part, to which in particular the suction hose of the suction device can be connected, preferably consists of an electrically conductive material, in particular an electrically conductive plastic material.

Preferably, a hose, which can be arranged on the connection device, in particular a suction hose of the suction device, is electrically conductively connected to the ground of the grinder via the extension and is thus grounded.

Undesirable electrostatic loading of the extension and/or the hose can thus be avoided in particular during the operation of the grinding machine.

Description of drawings

Further preferred features and/or advantages of the invention are described below and shown in the illustration of an exemplary embodiment. in:

Fig. 1 schematically shows a perspective view of a hand-held grinder and an extension part arranged thereon from a top view on the top of the grinder;

Figure 2 schematically shows a side view of the grinder in Figure 1 together with extensions;

Figure 3 schematically shows a vertical longitudinal section of the grinder and extension in Figure 1;

Figure 4 shows an enlarged view of area IV in Figure 3;

Fig. 5 schematically shows a motor housing of a grinding machine and a fixed section of an extension part, viewed in the direction of the line of sight in the direction of the arrow in Fig. 2, in a vertical cross-sectional view along line 5-5;

FIG. 6 schematically shows a perspective view of the grinding machine together with the extension part in the direction of the line of sight to the bottom surface of the grinding machine;

Fig. 7 schematically shows a perspective view of the grinding machine corresponding to Fig. 6, wherein no extension part is provided on the grinding machine;

Figure 8 shows an enlarged view of area VIII in Figure 7;

Figure 9 schematically shows a perspective view of the same extension part of Figure 1 in a disassembled state;

FIG. 10 shows an enlarged view of area X in FIG. 9 .

detailed description

Identical or functionally similar components are provided with the same reference symbols throughout the figures.

One embodiment of a hand-held grinder shown in FIGS. 1 to 10 as a whole and designated 100 is, for example, a long-bar grinder, by means of which large-area surfaces can be processed in a simple and convenient manner, in particular Walls, ceilings and floors.

Grinder 100 includes a cutter head 102 that includes a tool receiver 104 .

A tool 106 , for example a grinding element, can be arranged on the tool receptacle 104 .

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

The swivel device 108 thus comprises a fork part 112 and a swivel part 116 arranged rotatably on the fork part 112 about a swivel axis 114 .

The rotary part 116 is designed, for example, as a rotary ring 118 (see FIG. 2 ).

The fork part 112 is rotatably connected to the housing 120 of the tool head 102 by means of a rotary ring 118 .

The fork part 112 , the swivel part 116 and the housing 120 of the tool head 102 are connected to one another in such a way that the tool head 102 is rotatable relative to the fork part 112 about two rotational axes 114 oriented substantially perpendicular to each other.

The holding device 110 of the grinder 100 comprises a tubular shaft portion 122 having a proximal end 124 which is close to the user in the use condition and a distal end 126 which is remote from the user in the use condition.

On the distal end 126 of the tubular shank 122 of the holding device 110 is arranged the fork part 112 and thus the tool head 102 .

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

The motor housing 128 of the grinder 100 is used to receive the drive motor 130 of the grinder 100 .

The motor housing 128 includes a handle part 132 on which the grinder 100 can be gripped particularly conveniently by the user.

Via a movable shaft 134 , the motor 130 is connected to the tool receptacle 104 , so that in particular the tool receptacle with the tool 106 arranged thereon can be driven rotationally, vibratingly and/or eccentrically.

The movable shaft 134 extends at least in sections within the interior of the tubular shaft 122 .

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

Grinder 100 also includes a suction channel 138 , which extends from cutter head 102 to proximal end 124 of tubular shaft 122 and includes a plurality of suction channel sections 140 .

The movable tubular part 136 and the tubular shaft 122 form in particular a suction section 140 of the suction channel 138 .

In order to optimize the weight distribution of the grinder 100 , the drive motor 130 is preferably arranged on the side of the central axis 142 of the tubular shank 122 opposite the cutter head 102 .

In the state of use of the grinder 100 , the user can grip, for example, on the handle part 132 and the tubular shaft 122 of the holder 110 of the grinder 100 .

The tubular shaft 122 thus forms the gripping area 144 of the grinder 100 .

When the user grasps the grip region 144 on the tubular shaft 122 of the holding device 110 with one hand and grips the handle part 132 with the other hand, a certain range of radius of motion is thus obtained, in which Within the range of activity radius, the user starts from his predetermined standing position, with which the tool head 102 can reach the surface to be treated.

For example to handle taller roofs, this radius of motion may not be sufficient.

Accordingly, it may be advantageous for the grinder 100 to be extended.

In the embodiment of the grinder 100 shown in FIGS. 1 to 10 , an extension part 146 is provided for this purpose, which can be fastened in a releasable manner to the grinder 100 , in particular to the motor housing 128 of the grinder 100 .

This extension part 146 comprises in particular a tubular shaft 148 which preferably forms an extension of the tubular shaft 122 of the holding device 110 of the grinder 100 .

In the state where the extension part 146 is assembled on the grinding machine 100, the tubular shaft part 122 of the holding part 110 and the tubular shaft part 148 of the extension part 146 are preferably oriented such that the central axis of the tubular shaft part 148 of the extension part 146 150 is at least approximately parallel to the central axis 142 of the tubular shaft 122 of the holding device 110 .

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

The extension part 146 also includes a fastening section 152 , by means of which the extension part 146 can be releasably fastened to the fastening section 154 of the motor housing 128 .

As shown in particular in FIG. 8 , fastening section 154 of motor housing 128 is designed in particular as recess 156 or recess 158 of motor housing 128 .

The fixation section 154 includes the proximal end 124 of the tubular shaft 122 of the holding device 110 of the grinder 100 .

At the proximal end 124 of the tubular shaft 122 of the holding device 110 is provided a connecting device 160 . On this connecting device 160 can be connected (not shown) suction device, especially vacuum cleaner, thereby can extract and discharge the dust and grinding that produce in the working head 102 region through suction channel 138 during the work of grinder 100. powder.

Fastening section 154 of motor housing 128 also includes a projection 162 , which protrudes from behind via extension part 146 so that extension part 146 is releasably fastened to motor housing 128 of grinder 100 . .

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

Fastening section 154 of motor housing 128 also includes at least one receiving opening 164 .

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

The tubular shaft 122 in particular extends through a motor housing 128 .

Receiving opening 164 of fastening section 154 of motor housing 128 serves in particular to receive projection 166 of extension part 146 .

As shown in particular in FIGS. 9 and 10 , the extension part 146 includes a fastening section 152 by means of which the extension part 146 can be fastened, in particular releasably, to the fastening section 154 of the motor housing 128 .

The fastening section 152 of the extension part 146 is advanced into the grinding machine 100 in particular along the central axis 150 of the tubular shaft part 148 of the extension part 146 and/or along the central axis 142 of the tubular shaft part 122 of the holding device 110 of the grinding machine 100 on the motor housing 128 and can be connected to the motor housing 128 in a detachable manner.

For this purpose, in particular a locking device 170 is provided, by means of which the extension part 146 can be locked with the motor housing 128 .

The locking device 170 comprises two locking parts 172 .

The locking part 172 is designed, for example, as a button 174 .

Preferably, the locking device 170 also includes two spring elements 176 .

These spring parts 176 preferably correspond to locking parts 172 in this regard.

The locking part 172 is therefore preferably designed to be spring-loaded.

Locking parts 172 preferably each include a bevel 178 , which is oriented obliquely to central axis 142 and/or central axis 150 .

By means of the bevel 178, the user can move the locking part 172 and move it through the motor housing without having to specifically manipulate the locking part 172 during pushing the extension part 146 onto the fixed section 154 of the motor housing 128. The protrusion 162 of the fixed section 154 of the body 128 .

During the process of pushing the extension part 146 onto the fastening section 154 of the motor housing 128 , the extension part 146 can thus be easily locked on the motor housing 128 .

The locking part 172 configured as a button 174 is also preferably designed as an unlocking part 180 .

The locking connection formed by the locking device 170 between the extension part 146 and the motor housing 128 can be released by means of the unlocking part 180 . Therefore, the extension member 146 can be easily removed from the motor case 128 .

As can be seen in particular from FIG. 4 , in the assembled state of the extension part 146 , the tubular shaft 148 of the extension part 146 abuts at the connecting means 160 of the tubular shaft 122 of the holding device 110 of the grinder 100 .

The tubular shafts 148, 122 are thus fluidly connectable to each other.

The tubular shaft 148 of the extension part 146 can thus form an extension channel 182 of the suction channel 138 of the grinder 100 .

For example, the connection of the tubular shafts 148, 122 can be accomplished by means of the adapter part 183 in such a way that no dust and grinding powder can come out between the tubular shafts 148, 122 and no additional surroundings can be provided in this area. Ambient air is sucked in.

At the end 184 of the extension part 146 (in particular of the tubular shaft 148 of the extension part 146) away from the fixing section 152 of the extension part 146, preferably a connecting device 186 is provided, at which connection (not shown) can be connected. ) a suction device, in particular a vacuum cleaner, so that dust and grinding dust generated in the area of the cutter head 102 can be sucked out and removed through the suction channel 138 of the grinder 100 and the extension channel 182 of the extension part 146 .

Fastening section 154 of motor housing 128 , fastening section 152 of extension part 146 , tubular shaft 148 and/or connecting device 186 are preferably electrically conductive at least in sections. In particular, if the grounding of the suction device is not possible during operation of the grinding machine 100 , the suction device can preferably be grounded via the grounding line of the grinding machine 100 by means of the extension part 146 . In this way, an electric shock to the user due to the electrostatic loading of the components of the grinder 100 can be effectively avoided.

As shown in particular in FIGS. 1 , 2 , 5 and 6 , the motor housing 128 and the fastening section 152 of the extension part 146 are designed in such a way that these parts complement each other to form a uniform overall shape.

Fastening section 152 of extension part 146 is designed in particular such that it fills or complements recess 156 or recess 158 of fastening section 154 of complete motor housing 128 .

The fastening section 152 of the motor housing 128 and the extension part 146 is configured in such a way that the surfaces of the side walls 190 , the bottom wall 192 and/or the rear wall 194 of the motor housing 128 and the fastening section 152 of the extension part 146 188 are at least nearly flush with each other.

Preferably, the surface 188 of the side wall 190 , the bottom wall 192 and/or the rear wall 194 of the fastening section 152 of the extension part 146 is the side wall 190 , the bottom wall 192 and/or the rear wall of the motor housing 128 The substantially continuous continuation of surface 188 of 194 .

Fastening section 152 of extension part 146 in particular complements outer contour 196 of motor housing 128 .

As shown in particular in FIG. 5 , the fastening section 152 of the extension part 146 is configured in such a way that it is, for example, three-sided, that is, in the region of the side walls 190 and the bottom wall 192 an outer contour 196 is formed. The section, however, preferably does not protrude beyond the side wall 190 and the bottom wall 192 of the motor housing 128 in a plane perpendicular to the center axis 142 of the tubular shaft 122 .

For example, the grinding machine 100 shown in FIG. 7 can be extended like this by an extension part 146 shown in FIG. 9 :

The extension part 146 is pushed by its fastening section 152 onto the fastening section 154 of the motor housing 128 along the central axis 142 , 150 .

The locking parts 172 of the locking device 170 are thus moved outwards onto the projections 162 of the fastening section 154 of the motor housing 128 due to the bevel 178 until they lock behind the projections 162 and thus fix the extension part 146 on the On the grinder 100 , in particular on the motor housing 128 of the grinder 100 .

During the advancement of the extension part 146 onto the grinder 100 , the projection 166 is simultaneously introduced into the receiving opening 164 . A tilting of the tubular shaft parts 148 , 122 relative to each other can be effectively avoided by the fastening of the projection 166 in the receiving opening 164 .

Likewise, during the advancement of the extension part 146 onto the motor housing 128 of the grinder 100, the tubular shaft parts 148, 122 are positioned relative to each other and are connected to each other in a particularly fluid-tight manner via the adapter part 183, that is, An extension channel 182 for the suction channel 138 of the grinder 100 is formed by the extension part 146 .

In the assembled state of the extension part 146 shown in FIG. 1 on the grinder 100 , the user of the grinder 100 can use the tool head 102 to reach a working area remote from the user.

The user thus grips on the one hand the handle part 132 and on the other hand the grip region 198 on the tubular shaft 148 of the extension part 146 .

Particularly tall tops can thus be processed simply and conveniently by means of the extended grinder 100 .

To remove extension part 146 from motor housing 128 , the user actuates unlocking part 180 , which is designed as button 174 . The locking part 172 is thus disengaged from the projection 162 on the fastening section 154 of the motor housing 128 so that the extension part 146 can be removed from the fastening section 154 of the motor housing 128 along the central axis 150 , 142 .

The grinder 100 is therefore particularly suitable for processing close-by areas and can also be stored in a particularly compact manner thanks to the detached extension part 146 .

reference sign

100 grinder

102 tool head

104 Tool Receiving Department

106 tools

108 rotating device

110 holding device

112 fork parts

114 rotating shaft

116 rotating parts

118 rotating ring

120 cutter head housing

122 tubular shaft

124 proximal

126 remote

128 motor housing

130 drive motor

132 handle parts

134 active shafts

136 flexible pipe parts

138 suction channels

140 suction channel section

142 axis

144 grip areas

146 extension parts

148 tubular shaft

150 central axis

152 fixed sections

154 Fixed section of motor housing

156 gaps

158 grooves

160 connecting device

162 protrusion

164 receiving openings

166 protrusion

170 locking device

172 locking parts

174 buttons

176 spring parts

178 bevel

180 unlocked parts

182 extension channels

183 adapter parts

184 end

186 connection device

188 surfaces

190 side walls

192 bottom wall

194 back wall

196 outline

198 grip areas

Claims (19)

1. a hand-held grinding machine (100), described grinder comprises holding device (110) for keeping described grinder (100), CD-ROM drive motor (130), the motor shell (128) of described CD-ROM drive motor (130) and cutterhead (102)

Wherein said holding device (110) comprises the basic tubular rod portion (122) for tubulose, and described tubular rod portion comprises near-end (124) and far-end (126),

Wherein said motor shell (128) and the described CD-ROM drive motor (130) arranged in described motor shell is arranged on described near-end (124) and described cutterhead (102) is arranged on described far-end (126)

It is characterized in that,

Described motor shell (128) comprises the fixing section (154) for fixing elongate member (146) in the mode that can remove.

2. according to claim 1 or grinder as described in the preamble according to claim 1 (100), it is characterized in that, described grinder (100) comprises for fixing the fixing section (154) of elongate member (146) with the mode form fit that can remove.

3. grinder according to claim 2 (100), it is characterized in that, described grinder (100) and/or described elongate member (146) comprise the locking device (170) for fixing described elongate member (146) in the mode that can remove.

4. grinder according to claim 3 (100), it is characterized in that, described elongate member (146) can be advanced to the described fixing section (154) of described grinder (100) upper and/or can be pushed into described grinder (100) fixing section (154) in and can lock at this.

5. the grinder (100) according to claim 3 or 4, it is characterized in that, described locking device (170) comprises at least one unlocking feature (180), can by means of described unlocking feature to remove the locking of described elongate member (146) in order to remove described elongate member (146).

6. grinder according to claim 5 (100), is characterized in that, at least one unlocking feature (180) is configured to button (174).

7. grinder according to claim 6 (100), it is characterized in that, described locking device (170) comprises the unlocking feature (180) that two are configured to button (174), and described unlocking feature is arranged on the side respect to one another of the fixing section (152) of described elongate member (146) and/or is arranged on the side respect to one another of described fixing section (154) of described grinder (100).

8. according to any one in claim 1 to 7 or grinder as described in the preamble according to claim 1 (100), it is characterized in that, described grinder (100) comprises the fixing section (154) for fixing elongate member (146) in the mode that can remove, wherein said fixing section (154) comprises the end away from described cutterhead (102) (184) of air intake passage (138), and described air intake passage extends to described fixing section (154) from described cutterhead (102) always.

9. grinder according to claim 8 (100), it is characterized in that, described elongate member (146) comprises extending channel (182), under the state that described elongate member (146) is assemblied on the described fixing section (154) of described grinder (100), described extending channel is connected at the end away from described cutterhead (102) (184) place of the described air intake passage (138) of described grinder (100).

10. grinder (100) according to claim 8 or claim 9, it is characterized in that, the described fixing section (154) of described grinder (100) comprises the described near-end (124) of described tubular rod portion (122).

11. grinders as claimed in any of claims 1 to 10 (100), is characterized in that, described elongate member (146) comprises tubular rod portion (148).

12., according to the grinder (100) in claim 1 to 11 described in any one, is characterized in that,

Described grinder (100) comprises elongate member (146), described elongate member comprises fixing section (152), and the fixing section (154) of described grinder (100) is configured to groove (158) in described motor shell (128) or space (156)

Described groove (158) in wherein said motor shell (128) or the described fixing section (152) of described space (156) and described elongate member (146) construct like this, namely, be assemblied in the state of described motor shell (128) in described elongate member (146), fill described groove (158) in described motor shell (128) or described space (156) by the described fixing section (152) of described elongate member (146).

13. grinders according to claim 12 (100), it is characterized in that, by the described fixing section (152) of described elongate member (146), make the exterior contour (196) of the described motor shell (128) set out in advance by the wall of described motor shell (128) can become complete.

14. grinders (100) according to claim 12 or 13, it is characterized in that, under the state that described elongate member (146) is assembled to described motor shell (128), the outer surface (188) of the described fixing section (152) of described elongate member (146) flushes with the outer surface (188) of the wall (190,192,194) of described motor shell (128) substantially.

15. according to the grinder (100) in claim 1 to 14 described in any one, it is characterized in that, described elongate member (146) can be connected in the mode that can remove with the tubular rod portion (122) of described grinder (100) by adaptor parts (183).

16. grinders according to claim 15 (100), it is characterized in that, described elongate member (146) can be connected with the described tubular rod portion (122) of described grinder (100) in the mode that can remove like this, that is, make the inner space of described elongate member (146) connect with the inner space of described tubular rod portion (122) and fluid can be made to pass through be connected with the inner space in described tubular rod portion.

17. according to the grinder (100) in claim 1 to 16 described in any one, it is characterized in that, described grinder (100) comprises at least one spring members (176), can be locked in substantially gapless position in the assembled condition by means of elongate member (146) described in described spring members.

18. according to the grinder (100) in claim 1 to 17 described in any one, it is characterized in that, make the fixing section (152) of described elongate member (146) and/or the described fixing section (154) of described grinder (100) comprise plastics injection moulded component or be configured to plastics injection moulded component.

19. according to the grinder (100) in claim 1 to 18 described in any one, it is characterized in that, the tubular rod portion (148) of the ground wire of described grinder (100), described elongate member (146) and/or the flexible pipe of described elongate member (146) can be arranged on, particularly the inhaling hose of getter device, is electrically connected to each other.