JP6632840B2 - Grinder - Google Patents

Description

  The present invention relates to a grinder for performing processing such as grinding, polishing, and cutting on a workpiece.

  The grinder includes a spindle that is driven to rotate by a motor. The spindle is protruded from a housing in which the motor is housed, and a disk-shaped tip tool is attached to the tip. As a result, it is possible to process the workpiece by rotating the tip tool by the rotation of the spindle.

  By the way, a wheel cover that covers a part of the tip tool is provided on the outer peripheral side of the spindle to which the tip tool is attached (for example, see Patent Documents 1 and 2).

JP 2013-78823 A JP 2013-226617 A

  The wheel cover is removably mounted around a protruding portion of the housing from which the spindle protrudes. For this reason, depending on the user, the work of processing the workpiece may be performed in a state where the wheel cover is removed from the housing and the entire tool bit is exposed.

  Therefore, an object of one aspect of the present invention is to provide a grinder that can prevent a user from removing and using a wheel cover.

  A grinder according to one aspect of the present invention includes a motor, a housing for housing the motor, and a spindle protruding from the housing and driven by the motor in the housing to rotate.

  A wheel cover for covering a part of a tool bit attached to the spindle is arranged on an outer peripheral side of the spindle protruding from the housing. The wheel cover is held by the housing by a holding member formed separately from the wheel cover, and the arrangement position around the spindle can be changed.

  Therefore, according to this grinder, in order to remove the wheel cover from the grinder, it is necessary to remove the holding member from the wheel cover and the housing, and the work of removing the holding member is troublesome. For this reason, it can control that a user removes and uses a wheel cover.

  Further, even if the wheel cover is fixed to the housing via the holding member, the arrangement around the spindle can be changed, so that the position of the wheel cover can be appropriately adjusted when the grinder is used, and the usability of the grinder is improved. Can be suppressed from becoming worse.

  Here, in the housing, a mounting portion to which the wheel cover is mounted may be formed in a cylindrical shape surrounding the spindle, and the wheel cover may include an annular mounting portion which can be externally fitted to the mounting portion of the housing.

  In this case, the annular mounting portion of the wheel cover may be provided with a slit in an outer peripheral direction of a mounting portion of the housing, and the holding member may be configured by a rivet or a screw inserted into the slit.

  According to this configuration, the rivet or the screw is inserted into the slit, one end of the rivet or the screw is fixed to the mounting portion of the housing, and the head on the other end side is larger than the width of the slit. The cover can be firmly held in the housing.

  In this case, if the holding member is made up of rivets, the head of the rivet must be removed with a tool to remove the wheel cover from the housing, and the removal becomes extremely troublesome. The effect of suppressing the removal can be sufficiently exhibited.

  On the other hand, when the holding member is formed of a screw, if the head has a shape corresponding to a general tool (for example, a plus (+) shape, a minus (-) shape, or the like), the screw can be easily removed. It is preferable to crush the head of the screw or to prevent the screw from rotating with an adhesive or the like.

  In this case, if the head of the screw is shaped so that it can be fitted only with a special tool that is not commercially available, not only can the effect of suppressing removal of the wheel cover be exhibited, but also the screw can be The wheel cover can be removed, and thus, the replacement of the wheel cover can be easily performed without damaging the grinder and surrounding members.

  Next, the holding members may be dispersed and fixed at a plurality of locations on the outer periphery of the mounting portion of the housing. In this case, the hole cover can be held in the housing at a plurality of positions using the holding member, so that the center axis of the wheel cover can be suppressed from being inclined with respect to the center axis of the mounting portion of the housing. Therefore, the workability when the position is adjusted by rotating the wheel cover around the spindle can be improved.

  In the wheel cover, the annular attachment portion may be provided with a fastening member for fastening the attachment portion to the outer periphery of the attachment portion of the housing. In this case, since the wheel cover can be positioned and fixed to the housing by the fastening member, it is possible to prevent the wheel cover from being displaced with respect to the tip tool when the grinder is used, thereby preventing usability from being reduced.

  On the other hand, a grinder according to another aspect of the present invention includes a motor, a housing for housing the motor, and a spindle protruding from the housing and rotated by being driven by the motor in the housing, similarly to the above-described grinder.

  A wheel cover for covering a part of a tool bit attached to the spindle is disposed on an outer peripheral side of the spindle protruding from the housing, and the wheel cover is irremovably held to the housing.

Therefore, according to this grinder, the wheel cover cannot be removed from the grinder, and it is possible to prevent the user from removing and using the wheel cover.
Here, in the housing, when the mounting portion to which the wheel cover is mounted is formed in a cylindrical shape surrounding the spindle, and the wheel cover is provided with an annular mounting portion that can be externally fitted to the mounting portion of the housing, These components may be configured as follows.

  That is, one of the outer circumference of the mounting portion of the housing and the inner circumference of the mounting portion of the wheel cover is provided with a groove formed along the circumferential direction, and the other is inserted into the groove and slides in the groove. Possible projections or ridges may be provided.

  With this configuration, the mounting portion of the housing and the mounting portion of the wheel cover are connected by the groove and the protrusion or the ridge, so that the wheel cover is rotatable in the circumferential direction with respect to the housing, Cannot move axially.

Therefore, the position of the wheel cover around the spindle can be adjusted in a state where the wheel cover is irremovably held in the housing.
Next, the outer periphery of the mounting portion of the housing and the inner periphery of the mounting portion of the wheel cover may have an uneven shape that can be engaged at a predetermined rotation angle position to position the wheel cover with respect to the housing.

In this case, the wheel cover can be positioned at an arbitrary position around the spindle, and the position adjustment and the position fixing of the wheel cover can be easily performed.
In the wheel cover, the mounting portion may be formed in a ring shape by connecting the open ends of the ring with a fixing member. By removing the connection by the fixing member, the wheel cover can be removed from the housing. Therefore, for example, it is possible to replace the wheel cover for maintenance at a grinder repair shop or the like.

  In this case, for example, the above-described rivet may be used as the fixing member. That is, since the rivet cannot be easily removed using a tool, the wheel cover can be irremovably held to the housing.

It is a sectional view showing the composition of the grinder of a 1st embodiment. It is sectional drawing showing the state which cut | disconnected the attachment part to the housing of the wheel cover along a slit. FIG. 3 is a cross-sectional view illustrating a state where a wheel cover is rotated in FIG. 2. It is a perspective view showing the external appearance of the wheel cover attached to the grinder. FIG. 5 is a perspective view illustrating a state where a wheel cover is rotated in FIG. 4. It is a perspective view showing the structure of the whole grinder of a 2nd embodiment. It is sectional drawing showing the state which cut | disconnected the wheel cover and the grinder along the center axis of the spindle. It is a perspective view showing the structure of the whole grinder of a 3rd embodiment. It is a perspective view showing the structure of a wheel cover. It is a top view showing the state where the grinder to which the wheel cover was attached was seen from the wheel cover side. FIG. 11 is a sectional view taken along line AA shown in FIG. 10.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
As shown in FIG. 1, the grinder 2 of the present embodiment mainly includes a motor housing 4, a gear housing 6, a rear cover 8, and a wheel cover 10.

  The motor housing 4 is a substantially cylindrical housing and houses the motor 12. The rotation shaft 14 of the motor 12 is arranged so as to project toward the gear housing 6.

  The rear cover 8 is provided on one end side of the motor housing 4 in the central axis direction, and houses the power supply wiring portion 16. The power supply wiring section 16 is provided with a power supply cord 18 for supplying a current from an external power supply and a switch 19 for switching ON / OFF of driving of the grinder 2. The power supply wiring section 16 is electrically connected to the motor 12.

  The gear housing 6 is provided on the opposite side of the motor housing 4 from the rear cover 8 and houses a first bevel gear 20, a second bevel gear 22, a spindle 24, bearings 26 and 28, and the like.

  The first bevel gear 20 is fixed to the rotation shaft 14 of the motor 12 inside the gear housing 6. The second bevel gear 22, the spindle 24, and the bearings 26 and 28 are integrally provided in an internal housing 30 which is formed separately from the gear housing 6, and the internal housing 30 is fitted and fixed in the gear housing 6. As a result, it is accommodated in the gear housing 6.

  The inner housing 30 is fixed to the gear housing 6 by screwing headed male screws 29 (see FIG. 4, (See FIG. 5) and screwed into a female screw formed in a screw hole on the gear housing 6 side.

  The spindle 24 is rotatably provided in the inner housing 30 via a bearing 26. The inner housing 30 has a cylindrical shape coaxial with the center axis of the spindle 24, and is fixed in the gear housing 6 so that the spindle 24 is orthogonal to the rotation shaft 14 of the motor 12.

  The second bevel gear 22 is fixed to a spindle 24, and is screwed with the first bevel gear 20 in the gear housing 6, and converts the rotation output of the motor 12 into a rotation force around the spindle 24.

  One end of the spindle 24 is rotatably supported by the gear housing 6 via a bearing 28, and the other end of the spindle 24 projects outside from the inner housing 30 (in other words, the gear housing 6). .

  A protruding portion of the spindle 24 from the gear housing 6 is provided with an inner flange 32 for positioning and fixing a disk-shaped tip tool (not shown). Further, a screw portion 25 for screwing the lock nut 34 is formed on the outer peripheral portion of the spindle 24 at a position further distal than the inner flange 32. The lock nut 34 is for holding the tip tool with the inner flange 32.

  In the grinder 2 configured as described above, when the switch 19 is turned on, the motor 12 rotates, and the rotation output is transmitted via a gear mechanism (the first bevel gear 20, the first bevel gear 22) in the gear housing 6. Is transmitted to the spindle 24.

  For this reason, if the tip tool is fixed to the spindle via the lock nut 34, the tip tool can be rotated to perform operations such as grinding, polishing, and cutting. As the tip tool 36 used in the grinder 2 as described above, a grinding wheel, a cutting wheel, a wire brush, and the like can be given.

  A fan 15 is provided on the rotating shaft of the motor 12 for introducing outside air from a suction hole of the rear cover 8 and discharging air from a discharge hole 7 provided in the gear housing 6. By the rotation of the fan 15, the outside air passes around the motor 12, and the motor 12 is cooled.

  The wheel cover 10 protects a user from scattering of a workpiece or a piece of a tool bit which occurs during operations such as grinding, polishing, and cutting. For this reason, the wheel cover 10 is formed in a substantially semicircular shape so as to cover a part (specifically, approximately half) of the tip tool fixed to the spindle 24 from the gear housing 6 side.

The wheel cover 10 is fixed to a portion of the inner housing 30 from which the spindle 24 projects. Hereinafter, this fixing structure will be described in detail.
As shown in FIGS. 2 and 3, the mounting portion 40 for mounting the wheel cover 10 in the inner housing 30 has a cylindrical shape so as to surround the spindle 24 coaxially with the center axis of the spindle 24.

  In addition, as shown in FIGS. 1 to 5, in the wheel cover 10, a central portion of a semicircular plate surface that is arranged to face the tip tool is in contact with the outer periphery of the mounting portion 40 of the internal housing 30. A semicircular wall 50 rotatable around the spindle 24 is provided upright.

An annular mounting portion 52 is joined to the wall portion 50 so as to surround the entire outer periphery of the mounting portion 40 of the internal housing 30.
The wheel cover 10 is made of a metal plate containing iron as a main component, and the wall 50 is formed integrally with the wheel cover 10 by press molding or the like. The mounting portion 52 is made of a long metal plate mainly composed of iron, and is formed in an annular shape by press molding or the like. The opening end of the ring of the mounting portion 52 is bent outwardly of the ring so that it can be tightened in the radial direction by the tightening member 58 (see FIGS. 2, 3, and 5). In the present embodiment, the fastening member 58 is constituted by a headed male screw 58A and a nut 58B.

  The mounting portion 52 is joined to the wheel cover 10 by welding or the like so as to surround the wall portion 50 of the wheel cover 10. In the wall portion 50 of the wheel cover 10 to which the mounting portion 52 and the mounting portion are joined, a long slit 54 </ b> A penetrating inward from outside the ring along the circumferential direction of the ring of the mounting portion 52. , 54B are formed.

  As shown by arrows in FIGS. 2 and 3, the slits 54A and 54B are formed in two regions extending from the open end side of the ring of the mounting portion 52 to the opposite side of the open end with respect to the center axis of the ring. Are formed respectively.

  Headed male screws 56A, 56B whose heads are larger than the widths of the slits 54A, 54B are inserted into the two slits 54A, 54B from outside the mounting portion 52, respectively. The male screws 56A and 56B are fixed to female screw portions 57A and 57B provided at the mounting portion 40 of the internal housing 30.

  In the attachment portion 40 of the inner housing 30, the female screw portions 57A and 57B to which the male screws 56A and 56B are fixed are formed at positions substantially opposed to each other with the central axis of the attachment portion 40 interposed therebetween.

  As a result, as can be seen from FIGS. 2 and 3 or FIGS. 4 and 5, the wheel cover 10 can rotate around the spindle 24 within a rotation angle range (approximately 180 degrees) in which the slits 54A and 54B are formed. It is.

  As described above, in the grinder 2 of the present embodiment, the annular mounting portion 52 integrally mounted on the wheel cover 10 is fitted to the mounting portion 40 of the internal housing 30 from which the spindle 24 projects.

  Then, the male screws 56A, 56B are formed in the slits 54A, 54B formed in the mounting portion 52, and the male screws 56A, 56B are fixed to the female screw portions 57A, 57B of the mounting portion 40, so that the wheel cover 10 is held in the inner housing 30. Is done.

  Therefore, according to the grinder 2 of the present embodiment, in order to remove the wheel cover 10 from the grinder 2, it is necessary to remove the male screws 56A and 56B, which are holding members, from the attachment portion 40 of the inner housing 30, and the removal operation is performed. It becomes troublesome. For this reason, it can control that a user removes and uses wheel cover 10.

  Further, since the mounting portion 40 of the inner housing 30 has a cylindrical shape coaxial with the center axis of the spindle 24, the rotatable range of the wheel cover 10 is limited by the circumferential length of the slits 54A and 54B. However, it is rotatable about the spindle 24.

  For this reason, the user can arbitrarily set the arrangement position of the wheel cover 10 around the spindle 24, in other words, the cover area of the tip tool fixed to the spindle 24, and the usability of the grinder 2 decreases. There is nothing to do.

  Further, in the wheel cover 10, the open end of the ring of the attachment portion 52 is bent outward of the ring, and the bent portion is passed through a male screw 58A constituting the fastening member 58, and the nut 58B is passed through. By screwing, it can be tightened in the radial direction.

  For this reason, the user sets the arrangement position of the wheel cover 10 around the spindle 24, and then tightens the mounting portion 52 of the wheel cover 10 in the radial direction via the fastening member 58 so that the wheel cover 10 is 24 can be positioned and fixed.

Accordingly, it is possible to prevent the position of the wheel cover 10 from being shifted with respect to the tip tool when the grinder 2 is used, thereby preventing the usability from being reduced.
Male screws 56A and 56B as holding members are fixed (screwed) at two places that divide the outer periphery of the mounting portion 40 of the internal housing 30 into approximately two parts, and male screws 56A and 56B are mounted on the mounting portion 52 of the wheel cover 10. Are respectively formed in two slits 54A and 54B for inserting the same.

  For this reason, according to the grinder 2 of the present embodiment, the wheel cover is so adjusted that the center axis of the inner housing 30 (and thus the spindle 24) and the center axis of the wheel cover 10 substantially coincide with each other with the male screws 56A and 56B. 10 can be held by the inner housing 30.

  Therefore, when the wheel cover 10 is rotated around the spindle 24 to adjust the position, the center axis of the wheel cover 10 is prevented from being inclined with respect to the center axis of the mounting portion of the inner housing 30 and the position adjustment becomes difficult. it can.

  In this embodiment, since the headed male screws 56A and 56B are used as holding members, if the heads of the male screws 56A and 56B have a shape corresponding to a general tool, the wheel cover 10 is removed from the grinder. It will be easier.

  For this reason, it is preferable that the heads of the male screws 56A and 56B be shaped so that they can be fitted only with special tools that are not commercially available, so that the male screws 56A and 56B cannot be easily removed from the inner housing 30.

For this purpose, for example, the male screws 56A and 56B may be bonded to the inner housing 30 by using a screw fixing adhesive. Alternatively, the heads of the male screws 56A, 56B may be crushed so that the male screws 56A, 56B cannot be removed from the inner housing 30 using a tool.
[Second embodiment]
As shown in FIGS. 6 and 7, the grinder 2 of the present embodiment has the same basic configuration as that of the first embodiment, and is different from that of the first embodiment in that a male screw 56A is used as a fixing member. The point is that rivets 60A and 60B (only one rivet 60A is shown in the figure) are used instead of 56B.

6 and 7 are the same as those of the first embodiment except for the rivets 60, and therefore, the same parts as those of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
As shown in FIGS. 6 and 7, in the grinder 2 of the present embodiment, rivets 60A instead of the male screws 56A and 56B are provided in the slits 54A and 54B formed in the wall portion 50 and the mounting portion 52 of the wheel cover 10. 60B is inserted.

  As shown in FIG. 7, the rivets 60A and 60B have holes 61A and 61B formed in place of the female screw portions 57A and 57B in the mounting portion 40 of the inner housing 30 (only one hole 61A is shown in FIG. 7). ) And are fitted. As a result, the wheel cover 10 is rotatably held by the inner housing 30 via the rivets 60A and 60B.

Therefore, the same effect as that of the first embodiment can be obtained also in the grinder 2 of the present embodiment. Further, since the rivets 60A and 60B are harder to be removed than the male screws 56A and 56B by being driven into the holes 61A and 61B, the removal of the wheel cover 10 from the grinder 2 can be more favorably suppressed.
[Third embodiment]
As shown in FIGS. 8 to 11, the grinder 2 of the present embodiment has the same basic configuration as those of the first and second embodiments. , The mounting portion 40 of the inner housing 30 and the fastening member 62.

  Therefore, in the present embodiment, in FIGS. 8 to 11, the same parts as those in the above-described embodiments are denoted by the same reference numerals, and the description thereof will be omitted, and different points from the above-described embodiment will be described.

  As shown in FIGS. 8 and 10, the mounting portion 40 of the inner housing 30 to which the wheel cover 10 is mounted has an outer peripheral surface that has a predetermined rotation angle around the central axis of the inner housing 30 (in other words, the spindle 24). It has a corrugated shape so that it has irregularities.

  Further, as shown in FIG. 9, in the wheel cover 10, the wall portion 50 that comes into contact with the attachment portion 40 of the inner housing 30 also has a waveform shape corresponding to the outer peripheral surface of the attachment portion 40.

  An annular mounting portion 52 is joined to the wall portion 50 of the wheel cover 10 from the outside by welding or the like, similarly to the above embodiment. For this reason, approximately half of the inner peripheral surface of the mounting portion 52 has a waveform shape corresponding to the outer peripheral surface of the mounting portion 40 of the internal housing 30.

  Accordingly, when the wheel cover 10 is rotated around the spindle 24 in a state where the wheel cover 10 is attached to the inner housing 30, an arbitrary rotation angle at which the waveforms formed on the outer peripheral surface of the attaching portion 40 and the inner peripheral surface of the attaching portion 52 overlap with each other. The position will be determined.

  As shown in FIG. 9, projections 51 are respectively provided on the inner peripheral surface of the wall portion 50 of the wheel cover 10 at both ends in the circumferential direction forming a semicircular shape. FIG. 9 shows a state of the wheel cover 10 before the mounting portion 52 is joined to the wall portion 50 by welding or the like.

  On the other hand, on the outer peripheral surface of the mounting portion 40 of the inner housing 30 with which the inner peripheral surface of the wall portion 50 of the wheel cover 10 abuts, as shown in FIG. I have.

  The groove 42 is formed when the projection 51 is inserted and the wheel cover 10 is rotated around the spindle 24 when the wheel cover 10 is mounted on the mounting portion 40 of the inner housing 30 via the mounting portion 52. , A groove for sliding the projection 51.

  For this reason, once the wheel cover 10 is mounted on the inner housing 30, the wheel cover 10 is moved in the direction of the central axis of the spindle 24 so that the diameter of the mounting portion 52 is enlarged and the projection 51 does not come out from the groove 42, so that Cannot be removed.

  In the present embodiment, a rivet is used as the fastening member 62 for connecting the open ends of the mounting portion 52 so that the wheel cover 10 cannot be removed from the inner housing 30 (in other words, cannot be detached). ing. The rivet is of a type in which a head for retaining is formed on both sides of the hole by passing the hole through a hole to be mounted and pressing with a tool from both sides.

  For this reason, the wheel cover 10 cannot be removed from the grinder 2 after being fixed because the mounting portion 52 is tightened and fixed around the mounting portion 40 of the inner housing 30 by the tightening member 62 made of rivets.

  Further, in the wheel cover 10, a projection 51 protruding from a wall portion 50 forming a part of an inner wall surface of the mounting portion 52 slides in a groove 42 formed on an outer peripheral surface of a mounting portion 40 of the inner housing 30. Thus, it is rotatable around the spindle 24.

  The rotation position is arbitrarily determined such that the waveforms formed on the outer peripheral surface of the mounting portion 40 of the inner housing 30 and the wall portion 50 serving as the inner peripheral surface of the mounting portion 52 overlap each other. Therefore, in the present embodiment, the positioning of the wheel cover 10 around the spindle 24 can be easily performed.

As described above, the embodiments of the present invention have been described. However, the present invention is not limited to the above embodiments, and can take various forms without departing from the gist of the present invention.
For example, in the above embodiment, the wheel cover 10 is described as being held in the internal housing 30 provided with the spindle 24, but may be held in the gear housing 6 in which the internal housing 30 is stored.

  The gear housing 6 is integrated with the inner housing 30, and the spindle 24, the first bevel gear 20, the second bevel gear 22, the bearings 26, 28, etc. are all provided directly on the gear housing 6. You may.

  On the other hand, in the first and second embodiments, the rotation of the wheel cover 10 around the spindle 24 is allowed by the slits 54A, 54B and the male screws 56A, 56B or the rivets 60A, 60B inserted through the slits 54A, 54B. Meanwhile, the wheel cover 10 is prevented from being removed from the grinder 2. Further, in the third embodiment, the same effect is obtained by the groove 42 and the projection 51.

  On the other hand, the same effect can be obtained by, for example, fitting the annular mounting portion 52 of the wheel cover 10 to the mounting portion of the housing of the grinder 2 and then increasing the diameter of the opening end of the mounting portion. Obtainable.

  Further, in the first and second embodiments, the number of the external threads 56A, 56B or the rivets 60A, 60B as the holding member is described as two, but this number may be one, or three or more. It may be. Further, in the third embodiment, the number of the protrusions 51 inserted into the groove 42 may be three or more, or a protrusion may be used instead of the protrusion.

  Further, in each of the above embodiments, the mounting portion 52 of the wheel cover 10 is described as being integrally joined to the wall portion 50 of the wheel cover 10, but the mounting portion 52 may be integrally formed with the wheel cover 10. It may be.

  2 ... grinder, 4 ... motor housing, 6 ... gear housing, 7 ... discharge hole, 8 ... rear cover, 10 ... wheel cover, 12 ... motor, 14 ... rotary shaft, 15 ... fan, 16 ... power wiring section, 18 ... power supply Cord, 19 ... Switch, 20 ... First bevel gear, 22 ... Second bevel gear, 24 ... Spindle, 25 ... Screw part, 26,28 ... Bearing, 30 ... Inner housing, 32 ... Inner flange, 34 ... Lock nut, 40 ... Attachment site, 42 groove, 50 wall, 51 projection, 52 attachment portion, 54A, 54B slit, 56A, 56B male screw, 57A, 57B female screw portion, 58, 62 fastening member, 61A rivet .

Claims (3)

Motor and
A housing for housing the motor;
A spindle protruding from the housing and rotated by being driven by the motor in the housing;
A wheel cover that is arranged on the outer peripheral side of the spindle protruding from the housing and covers a part of a tool bit attached to the spindle;
A holding member configured to be separate from the wheel cover, and holding the wheel cover in the housing;
With
In the housing, a mounting portion to which the wheel cover is mounted has a cylindrical shape surrounding the spindle,
The wheel cover includes an annular mounting portion that can be fitted to the mounting portion of the housing and has a slit in an outer peripheral direction of the mounting portion,
The holding member is formed of a rivet having a head that is inserted into the slit of the mounting portion of the wheel cover, one end is fixed to the mounting portion of the housing, and the other end has a head larger than the width of the slit. By holding the wheel cover rotatably around the spindle,
In the wheel cover, a grinder is provided on the annular mounting portion, the tightening member being configured to tighten and fix the mounting portion to an outer periphery of the mounting portion of the housing. Motor and
A housing for housing the motor;
A spindle protruding from the housing and rotated by being driven by the motor in the housing;
A wheel cover that is arranged on the outer peripheral side of the spindle protruding from the housing and covers a part of a tool bit attached to the spindle;
A holding member configured to be separate from the wheel cover, and holding the wheel cover in the housing;
With
In the housing, a mounting portion to which the wheel cover is mounted has a cylindrical shape surrounding the spindle,
The wheel cover includes an annular mounting portion that can be fitted to the mounting portion of the housing and has a slit in an outer peripheral direction of the mounting portion,
The holding member is formed of a screw that is inserted into the slit of the mounting portion of the wheel cover, one end is fixed to the mounting portion of the housing, and the other end has a head that is larger than the width of the slit. By holding the wheel cover rotatably around the spindle,
The screw is fixed to the attachment portion so that removal from the attachment portion is difficult by the shape of the head or an adhesive for fixing,
In the wheel cover, a grinder is provided on the annular mounting portion, the tightening member being configured to tighten and fix the mounting portion to an outer periphery of the mounting portion of the housing. 3. The grinder according to claim 1 , wherein the holding members are dispersed and fixed at a plurality of locations on an outer periphery of the mounting portion of the housing. 4.

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