Cover for portable machining device and portable machining device

Abstract

A cover for a portable machining device includes a main cover and an auxiliary cover. The main cover covers a part or whole of an upper side of a tip tool of the portable machining device. The auxiliary cover is separable from the main cover and covers a part or whole of a rear side of the tip tool. The auxiliary cover is removably attachable.

Description

CROSS REFERENCE TO RELATED APPLICATION

[0001] This application claims the benefit of Chinese Patent Application Number 202410692073.5 filed on May 30, 2024, the entirety of which is incorporated by reference.FIELD OF THE INVENTION

[0002] The disclosure relates to a cover for a portable machining device, such as a wheel sander, and a portable machining device.BACKGROUND OF THE INVENTION

[0003] As illustrated in FIG. 9 of EP 2548697 A, there has been known a wheel sander including a cover 160.

[0004] The cover 160 in EP 2548697 A is provided around a wheel-shaped tool 104. The cover 160 integrally includes an exhaust unit 162 and a brush 170.

[0005] In the wheel sander, when a cover without the exhaust unit 162 is to be used, the whole cover needs to be replaced.SUMMARY OF THE INVENTION

[0006] The description discloses a cover for a portable machining device. The cover may include a main cover that covers a part or whole of an upper side of a tip tool of the portable machining device. The cover may include an auxiliary cover that is separable from the main cover and covers a part or whole of a rear side of the tip tool. The auxiliary cover may be removably attachable.

[0007] According to the portable machining device and the cover of the disclosure, the cover facilitated in handling and the portable machining device including the cover are provided.BRIEF DESCRIPTION OF THE DRAWINGS

[0008] FIG. 1 is a left side view of a wheel sander according to a first embodiment of the disclosure.

[0009] FIG. 2 is a perspective view of a front portion in FIG. 1 when viewed from a rear side.

[0010] FIG. 3 is a perspective view when a sanding wheel and a cover are removed from FIG. 2.

[0011] FIG. 4 is an exploded perspective view of the cover for the wheel sander in FIG. 1 when viewed from the rear side.

[0012] FIG. 5 is an exploded perspective view of the cover in FIG. 4 when viewed from a lower side.

[0013] FIG. 6 is a vertical cross-sectional view of the cover in FIG. 4 at the center in a right-left direction.

[0014] FIG. 7 is a perspective view of the cover in FIG. 4 when viewed from a front side.

[0015] FIG. 8 is a partial bottom view of an auxiliary cover of the cover in FIG. 4.

[0016] FIG. 9 is a partial enlarged perspective view of a wheel sander according to a second embodiment of the disclosure.

[0017] FIG. 10 is a partial enlarged cross-sectional view of an auxiliary cover of a wheel sander according to a third embodiment of the disclosure.DETAILED DESCRIPTION OF THE INVENTION

[0018] In one embodiment of the disclosure, the auxiliary cover may be removably attachable to the main cover. In the case, a cover from which only the auxiliary cover is removable is simply configured by providing an attachment portion of the auxiliary cover to the main cover.

[0019] In one embodiment of the disclosure, the auxiliary cover may hold the main cover. Alternatively, the main cover may hold the auxiliary cover. In the case, the auxiliary cover can be toollessly attached.

[0020] In one embodiment of the disclosure, the cover may include a brush separable from the main cover and the auxiliary cover. The brush may be removably attachable. In the case, the user can select whether to provide the brush.

[0021] In one embodiment of the disclosure, the auxiliary cover may hold the brush. Alternatively, the brush may hold the auxiliary cover. In the case, the brush can be toollessly attached.

[0022] In one embodiment of the disclosure, the main cover may be removably attached to a handle portion of the portable machining device. In the case, the mounting portion of the main cover is more simply configured.

[0023] In one embodiment of the disclosure, the auxiliary cover may be provided with a dust discharge port. In the case, the dust is more easily discharged. The auxiliary cover can be connected to a dust collector or a dust bag.

[0024] In one embodiment of the disclosure, the cover may include a lid removably attachable to the dust discharge port. In the case, when it is not necessary to discharge the dust, passing through of the dust from the dust discharge port is suppressed.

[0025] In one embodiment of the disclosure, an attachment angle of the auxiliary cover to the main cover may be adjustable. In the case, the attachment angle of the cover can be adjusted corresponding to the dust scattering direction. Accordingly, scattering of the dust is more suppressed.

[0026] In one embodiment of the disclosure, the tip tool may be removably attachable. At least one of the auxiliary cover and the main cover does not need to cover a portion through which the tip tool passes at attachment and detachment. In the case, the tip tool is more easily removed.

[0027] The description discloses a portable machining device. The machining device may include the above-described cover for a portable machining device.

[0028] Embodiments of the disclosure are described below with reference to the drawings as necessary. The description includes modifications of the embodiments. The disclosure is not limited to the embodiments and the modifications.

[0029] Directions of front, rear, up, down, left, and right in the embodiments and the modifications are defined for convenience of explanation, and may be changed due to, for example, at least any of a state of work and a move of a member.

[0030] A first embodiment is described.

[0031] FIG. 1 is a left side view of a wheel sander 1 as an example of a machining device and a portable machining device according to the first embodiment of the disclosure. FIG. 2 is a perspective view of a front portion of the wheel sander 1 when viewed from a rear side. FIG. 3 is a perspective view when a sanding wheel 32 and a cover 6 are removed from FIG. 2. FIG. 4 is an exploded perspective view of the cover 6 when viewed from the rear side.

[0032] The wheel sander 1 according to the first embodiment includes a main body portion 2, a handle portion 4, and the cover 6. The cover 6 may be a component of the main body portion 2, or may be a component of the handle portion 4.

[0033] In FIG. 1, the left side is the front side of the wheel sander 1. In FIG. 3, the upper side is the upper side of the wheel sander 1.

[0034] The main body portion 2 has a columnar shape with a center axis in a front-rear direction.

[0035] The main body portion 2 includes a housing 10, a motor 12, a fan 14, a battery mounting portion 16, a battery 18, a controller 20, a connector 22, a speed adjustment dial 24, a main switch 26, a power transmission unit 28, a shaft lock unit (not illustrated), a spindle 30 (FIG. 3) as an output shaft, a tip tool attachment portion 31, and the sanding wheel 32 as a tip tool.

[0036] In the main body portion 2, the battery 18, the battery mounting portion 16, the controller 20, the connector 22, the motor 12, the fan 14, the power transmission unit 28, and the spindle 30 are arranged in this order from the rear side.

[0037] At least one of the battery 18 and the sanding wheel 32 may be a component independent of the main body portion 2 or the wheel sander 1 instead of being a component of the main body portion 2 or the wheel sander 1. In addition, the spindle 30 may be a component of the power transmission unit 28, and the tip tool attachment portion 31 may be used as the output shaft. Further, the spindle 30 and the tip tool attachment portion 31 may be configured as the output unit together.

[0038] The housing 10 constitutes an outer wall of the main body portion 2.

[0039] The housing 10 holds various members directly or indirectly.

[0040] The housing 10 includes a motor housing 40, a fan case 42, a gear housing 44, and a bearing box 45.

[0041] The motor housing 40 is made of plastic. The motor housing 40 is halved and includes a left motor housing and a right motor housing. The left motor housing and the right motor housing are joined by screws (not illustrated) in the right-left direction.

[0042] The motor housing 40 has a tubular shape. The motor housing 40 has a front end portion that forms a front opening portion opening forward. The motor housing 40 has a rear end portion that forms a rear opening portion opening rearward.

[0043] The motor housing 40 has a center portion in the front-rear direction that forms a grip portion G that a user can grip.

[0044] The fan case 42 is made of aluminum die cast alloy. The fan case 42 has a ring shape. The fan case 42 opens to the front and rear.

[0045] The gear housing 44 is made of aluminum die cast alloy. The gear housing 44 is a bell-shaped member having a front portion reduced in diameter with respect to a rear portion. The gear housing 44 has a rear end portion opening rearward. The gear housing 44 has a left front portion opening leftward.

[0046] The gear housing 44 is fixed to the motor housing 40 via the fan case 42. The rear opening portion of the fan case 42 is joined to the front opening portion of the motor housing 40. The rear opening portion of the gear housing 44 is joined to the front opening portion of the fan case 42. The gear housing 44 is fixed to the fan case 42 with a plurality of (four) screws 48 that extend forward and rearward. The screws 48 are arranged at the upper right, lower right, upper left, and lower left at the fan case 42 and the rear portion of the gear housing 44. Each of the screws 48 is inserted rearward from the front side.

[0047] The bearing box 45 (FIG. 3) is made of aluminum die cast alloy. The bearing box 45 has a cylindrical shape with a flange portion. The bearing box 45 has a center axis direction extending rightward and leftward.

[0048] The bearing box 45 is integrally fixed to the gear housing 44 by a plurality of (four) screws 49 (FIG. 3) in the right-left direction. The screws 49 are arranged at upper front, lower front, upper rear, and lower rear positions of the flange portion of the bearing box 45.

[0049] The bearing box 45 has a right opening portion connected to the left front opening portion of the gear housing 44.

[0050] The housing 10 is variously changeable. For example, in the motor housing 40, a front portion and a rear portion may be separate bodies that can be combined with one another. In the halved motor housing 40, at least one of the size and the shape may significantly differ between the left motor housing and the right motor housing.

[0051] Furthermore, the left motor housing and the right motor housing may be combined by means other than screws 46 using, for example, a locking portion, such as a pawl, and a locked portion, such as a pawl hole. The gear housing 44 may be halved. The fan case 42 may be omitted by being integrated with the motor housing 40 or the gear housing 44. Materials of various parts in the housing 10 may be changed. At least one of the number and the arrangement of exhaust ports 47 may be changed as necessary.

[0052] The motor 12 is an electric motor, which is a brushless motor and a DC motor.

[0053] The motor 12 includes a motor shaft 50.

[0054] The motor shaft 50 rotates around its own center axis. The motor shaft 50 extends forward and rearward.

[0055] At a front end portion of the motor shaft 50, a pinion portion 52 is formed.

[0056] The fan 14 is fixed integrally with the motor shaft 50.

[0057] The fan 14 is a centrifugal fan. Alternatively, another fan, such as an axial fan, may be used as the fan 14.

[0058] At an outside of the fan 14 in a radial direction, the exhaust ports 47 of the fan case 42 are provided.

[0059] The battery mounting portion 16 is arranged at the rear end portion of the main body portion 2. The battery mounting portion 16 expands upward, downward, leftward, and rightward with respect to a part at the front side.

[0060] The battery 18 is mounted to the battery mounting portion 16. The battery mounting portion 16 includes a main body portion side terminal that is connected to a terminal of the battery 18. The main body portion side terminal is arranged in a rear opening portion of the main body portion 2.

[0061] The battery 18 is mounted at the rear side of the battery mounting portion 16. The battery 18 is fitted by sliding downward from an upper side of the battery mounting portion 16. The slide-fitting direction of the battery 18 may be a direction other than the direction downward from the upper side. In addition, the battery 18 may be fitted in a manner other than the slide-fitting.

[0062] The battery 18 is a 36 volt (V) lithium-ion battery. The battery 18 contains ten cells (not illustrated) in a battery case made of plastic. The cell has an axially long columnar shape that is oriented in the right-left direction when the battery 18 is mounted. The battery 18 retains electric power to drive the motor 12. Any lithium-ion battery of 10.8 V, 14.4 V, 18 V, 25.2 V, 28 V, or the like may be used as the battery 18. A lithium-ion battery of a voltage less than 10.8 V or exceeding 36 V may be used as the battery 18. A battery of another kind may be used as the battery 18. A plurality of batteries 18 may be used.

[0063] The controller 20 is held inside the battery mounting portion 16.

[0064] The controller 20 controls the motor 12. The motor 12 is electrically connected to the controller 20 via the connector 22. Furthermore, the main body portion side terminal of the battery mounting portion16 is electrically connected to the controller 20.

[0065] Moreover, the speed adjustment dial 24 and the main switch 26 are each electrically connected to the controller 20.

[0066] The connector 22 is interposed in a lead wire (not illustrated) connecting between the motor 12 and the controller 20.

[0067] The connector 22 can be disconnected in a reconnectable manner. When only one of the motor 12 and the controller 20 needs to be replaced due to a fault and the like, the one can be easily replaced by disconnecting the connector 22.

[0068] The speed adjustment dial 24 is arranged at an upper portion of the rear end portion of the motor housing 40.

[0069] The speed adjustment dial 24 expands upward, downward, leftward, and rightward and is rotatable around an imaginary axis in the front-rear direction.

[0070] The speed adjustment dial 24 has an exposed upper end portion.

[0071] The main switch 26 is arranged at a front end upper portion of the motor housing 40.

[0072] The main switch 26 has an exposed upper portion. The main switch 26 is slidable forward and rearward from a rearward off position to a maximum on position ahead of the off position.

[0073] The main switch 26 is switched on after a predetermined play when a user performs a forward slide operation from the off position.

[0074] It should be noted that when the main switch 26 is operated further forward from the on state, a state of a signal issued may be changed according to the amount of forward operation. In the case, the speed adjustment dial 24 may be omitted, and the controller 20 may change a rotation speed of the motor 12 according to the state of the signal of the main switch 26. The controller 20 may control the motor 12 such that the more the main switch 26 is operated forward, the higher the rotation speed of the motor 12. In addition, the play may be omitted, and the main switch 26 may be switched on soon after starting the forward operation.

[0075] The power transmission unit 28 transmits the power of the motor 12 to the sanding wheel 32 via the spindle 30. The spindle 30 has a columnar shape. The spindle 30 extends rightward and leftward.

[0076] The power transmission unit 28 is arranged in the gear housing 44. The power transmission unit 28 includes a bevel gear (not illustrated).

[0077] The bevel gear engages with the pinion portion 52.

[0078] The bevel gear decelerates the rotation of the motor shaft 50 and transmits the rotation to the spindle 30.

[0079] A right portion of the spindle 30 is provided in the gear housing 44.

[0080] A center portion of the spindle 30 is provided in the bearing box 45.

[0081] A left portion, that is, a distal end portion of the spindle 30 protrudes leftward from the left opening portion of the bearing box 45.

[0082] The shaft lock unit is disposed at a lower right portion of the gear housing 44.

[0083] The shaft lock unit includes a shaft lock button, a lock pin, and a coil spring as an elastic body.

[0084] When the user presses the shaft lock button leftward against the biasing force of the coil spring in a non-driving state of the motor 12, the lock pin enters a lock hole of the bevel gear of the power transmission unit 28.

[0085] Accordingly, when the user presses the shaft lock button, the rotation of the bevel gear and the member connected thereto are locked.

[0086] The tip tool attachment portion 31 has a columnar shape extending rightward and leftward.

[0087] The tip tool attachment portion 31 includes a shaft body 100, a sleeve 102, a coil spring (not illustrated), which is a compression spring, as an elastic body having elasticity in an axial direction, a holding member 106, a torsion spring (not illustrated) as an elastic body having elasticity in the rotation direction around the shaft, a cap 112, and a screw 114.

[0088] The shaft body 100 and the sleeve 102 constitute a shaft portion 115. The shaft portion 115 may include another component.

[0089] The sanding wheel 32 has a sanding surface P and a center hole 32H.

[0090] The sanding wheel 32 has a columnar shape with the center hole 32H along a center axis.

[0091] The sanding surface P is arranged on an outer curved surface, that is, a cylindrical surface of the sanding wheel 32. The sanding surface P of the rotating sanding wheel 32 is brought into contact with a portion to be worked of a workpiece, thereby sanding the portion to be worked.

[0092] The center hole 32H has a “+” shape or “X” shape when viewed from the left side to the right. A center portion of the center hole 32H has a columnar shape extending leftward and rightward. A plurality of (four) wheel grooves 32D are communicated with the center portion of the center hole 32H. Each wheel groove 32D is recessed in a radial direction and extends leftward and rightward. The four wheel grooves 32D are arranged at regular intervals in the circumferential direction. Two of the four wheel grooves 32D face one another as a pair. The remaining two wheel grooves 32D face one another as the other pair.

[0093] The sanding wheel 32 is fitted to the tip tool attachment portion 31 by entry of the tip tool attachment portion 31 into the center hole 32H. The center hole 32H may have a “@” shape with only one straight part.

[0094] The shaft body 100 (FIG. 3) has a columnar shape extending rightward and leftward.

[0095] The sleeve 102 has a cylindrical shape extending rightward and leftward. The sleeve 102 includes a plurality of (two) ridges 120 and a step portion 130.

[0096] Each ridge 120 is formed on an outer surface of the sleeve 102. Each ridge 120 projects outward in the radial direction and extends rightward and leftward. Each ridge 120 can be inserted into the wheel groove 32D in the center hole 32H of the sanding wheel 32. Each ridge 120 has a left end portion at which a protruding portion 122 is formed. Each protruding portion 122 projects leftward with respect to an adjacent part. Each protruding portion 122 has a width, that is, a size in an up-down direction or circumferential direction smaller than a width of the ridge 120 at the right side of the protruding portion 122. The width of each protruding portion 122 may be the same as the width of the ridge 120 at the right side of the protruding portion 122 or may be larger than the width of the ridge 120 at the right side of the protruding portion 122.

[0097] The step portion 130 is formed at a right end portion of the sleeve 102. The step portion 130 has a ring shaped when viewed from the left side to the right. The step portion 130 expands in the front-rear and up-down directions.

[0098] Between the shaft body 100 and the sleeve 102, the coil spring is interposed.

[0099] The coil spring biases the sleeve 102 leftward with respect to the shaft body 100.

[0100] The holding member 106 has a cylindrical shape extending rightward and leftward. The holding member 106 includes a holding member main body portion 140, a plurality of (two) protrusions 142, and a plurality of (two) recesses 144.

[0101] The holding member main body portion 140 is formed at the center in the right-left direction. The holding member main body portion 140 bulges outward in the radial direction with respect to an adjacent part.

[0102] The holding member main body portion 140 has an outer diameter larger than an outer diameter of the adjacent part. The outer diameter of the holding member main body portion 140 is similar to an outer diameter of the sleeve 102 excluding the ridges 120.

[0103] An outer diameter of a portion at the right side with respect to the holding member main body portion 140 of the holding member 106 is similar to that of the left opening portion of the sleeve 102. A right part of the portion at the right side with respect to the holding member main body portion 140 of the holding member 106 is inserted into the left opening portion of the sleeve 102.

[0104] The respective protrusions 142 project outward in the radial direction of the holding member main body portion 140. The respective protrusions 142 are arranged at regular intervals in the circumferential direction and face one another across a center axis of the holding member 106.

[0105] Each protrusion 142 can be inserted into the wheel groove 32D.

[0106] The respective recesses 144 have a similar shape to one another. Each recess 144 is recessed to the left from a right end portion of the holding member main body portion 140. The holding member 106 has an outer diameter at the respective recesses 144 similar to that of the portion at the right side with respect to the holding member main body portion 140 of the holding member 106. Each recess 144 has a “>” shape when viewed from the rear side to the front. Each recess 144 includes a first recessed portion (not illustrated) and a second recessed portion 152.

[0107] The first recessed portion is recessed in the radial direction and extends rightward and leftward. The first recessed portion has a width, that is, a size in the circumferential direction similar to the width of each protruding portion 122 of the sleeve 102. Each protruding portion 122 can be inserted into the first recessed portion. The first recessed portion is provided at the right side of the corresponding protrusion 142.

[0108] The second recessed portion 152 is recessed in the radial direction and extends rightward and leftward. The second recessed portion 152 has a “Z” shape having an inclined portion at the first recessed portion side.

[0109] The torsion spring is interposed between an inside of the portion at the right side with respect to the holding member main body portion 140 of the holding member 106 and the shaft body 100.

[0110] The torsion spring biases the holding member 106 in the circumferential direction and clockwise when viewed from the left side to the right.

[0111] The cap 112 has a disk shape and expands in the front-rear and up-down directions.

[0112] The cap 112 is integrally fixed to a left end portion of the shaft body 100 with the screw 114. The screw 114 is inserted into the left hole of the shaft body 100.

[0113] The holding member 106 is held between the cap 112 and the sleeve 102 and is rotatable around the center axis in the right-left direction.

[0114] The attachment and detachment of the sanding wheel 32 to and from the tip tool attachment portion 31 is described below.

[0115] The attachment and detachment of the sanding wheel 32 may be carried out in a posture of the wheel sander 1 which is in a direction different from an illustrated direction, that is, a direction indicated in the description. For example, the attachment and detachment of the sanding wheel 32 may be carried out in a posture where the tip tool attachment portion 31 is oriented in the vertical direction and the distal end portion of the tip tool attachment portion 31 comes an upper side. The following description follows the illustrated direction.

[0116] When the sanding wheel 32 that has been detached from the tip tool attachment portion 31 is mounted, it is confirmed that the respective protrusions 142 of the holding member 106 overlap the corresponding ridges 120 of the sleeve 102 when viewed from the left side to the right, that is, in the longitudinal direction of the tip tool attachment portion 31. Specifically, the user confirms that the respective protrusions 142 have similar rotation positions to the corresponding ridges 120. When the respective protrusions 142 are not in the similar rotation positions to the corresponding ridges 120 (FIG. 3), the user turns the holding member 106 counterclockwise when viewed from the left side to the right until the respective protrusions 142 are in the similar rotation positions to the corresponding ridges 120.

[0117] At this time, the holding member 106 is in an attached and detached state. In addition, the respective protruding portions 122 have been inserted into the corresponding first recessed portions of the recess 144. Accordingly, the holding member 106 is temporarily fixed in the attached and detached state.

[0118] The user then brings the sanding wheel 32 close to the tip tool attachment portion 31 from the left side to the right. The user inserts the tip tool attachment portion 31 into the center hole 32H. At this time, the two ridges 120 of the sleeve 102 and the two protrusions 142 of the holding member 106 are inserted into any one pair of the two pairs of the wheel grooves 32D.

[0119] The user inserts the sanding wheel 32 until a left surface of the sanding wheel 32 reaches the right side of the respective protrusions 142. At this time, a right surface of the sanding wheel 32 comes into contact with the step portion 130 of the sleeve 102.

[0120] The user further pushes the sanding wheel 32 to the right in FIG. 3. At this time, the right surface of the sanding wheel 32 pushes the sleeve 102 to the right against the biasing force of the coil spring. The sleeve 102 moves to the right with respect to the holding member 106. The protruding portions 122 of the sleeve 102 slide out to the right with respect to the first recessed portions of the holding member 106.

[0121] Then, when left end portions of the protruding portions 122 reach the right end portions of the first recessed portions and the protruding portions 122 come out and disengage from the first recessed portions, the holding member 106 automatically rotates clockwise when viewed from the left side to the right by the biasing force of the torsion spring. The rotation of the holding member 106 is completed when the protruding portions 122 come into contact with the end surfaces of the second recessed portions 152 at the side detached from the first recessed portions. The rotation of the holding member 106 releases the temporary fixation of the holding member 106 in the attached and detached state.

[0122] At this time, as illustrated in FIG. 1 and FIG. 2, the respective protrusions 142 are oriented in a diagonal direction, or in more detail, in a direction upward toward the front when viewed from the left side to the right. The respective protrusions 142 deviate from the corresponding ridges 120 when viewed from the left side to the right. Specifically, the holding member 106 is in a fixed state where the sanding wheel 32 can be fixed to the tip tool attachment portion 31.

[0123] When the user stops moving the sanding wheel 32 to the right, the sleeve 102 moves to the left with respect to the shaft body 100 by the biasing force of the coil spring. At this time, the step portion 130 of the sleeve 102 pushes the sanding wheel 32 to the left, and the sleeve 102 moves together with the sanding wheel 32.

[0124] Then, the left surface of the sanding wheel 32 comes in contact with the protrusions 142 of the holding member 106, and the sanding wheel 32 is held between the respective protrusions 142 and the step portion 130. Specifically, the sanding wheel 32 is held between the holding member 106 and the sleeve 102. Accordingly, the sanding wheel 32 is mounted to the tip tool attachment portion 31. The rotation positions of the respective protrusions 142 deviate from the rotation positions of the corresponding ridges 120 and therefore deviate from the rotation positions of the respective wheel grooves 32D of the sanding wheel 32. Accordingly, each protrusion 142 comes in contact with a part between the wheel grooves 32D adjacent in the circumferential direction.

[0125] The sanding wheel 32 is fitted in a state where the corresponding ridges 120 are inserted into one pair of wheel grooves 32D. Accordingly, a relative rotation of the sanding wheel 32 relative to the tip tool attachment portion 31 is suppressed.

[0126] When pulling out the fitted sanding wheel 32, the user first confirms that the main switch 26 is off, that is, the motor 12 is stopped.

[0127] Next, the user presses the shaft lock button. Then, the rotation of the tip tool attachment portion 31 is locked via the bevel gear and the spindle 30.

[0128] While pressing the shaft lock button, the user rotates the holding member 106 counterclockwise when viewed from the left side to the right against the biasing force of the torsion spring. At this time, the user pushes the sleeve 102 to the right via the sanding wheel 32 to cause the protruding portions 122 to come out of the second recessed portions 152 as necessary.

[0129] The holding member 106 enters the attached and detached state by the counterclockwise rotation. At this time, the protruding portions 122 of the sleeve 102 enter the first recessed portions of the holding member 106 by the biasing force of the coil spring. Accordingly, the holding member 106 is fixed in the attached and detached state. In addition, the sanding wheel 32 pops out to the left via the sleeve 102 that has received the biasing force of the coil spring.

[0130] The user moves the sanding wheel 32 to the left with respect to the tip tool attachment portion 31 and pull the sanding wheel 32 out of the tip tool attachment portion 31.

[0131] After the removal of the sanding wheel 32 is completed, the user stops depressing the shaft lock button.

[0132] The handle portion 4 includes a handle holder 200, a handle lever 201, and a grip 202.

[0133] The handle holder 200 has an arm shape and extends upward and downward. The handle holder 200 is made of metal.

[0134] The handle holder 200 includes a mounting portion 210, an upper hole portion 214, and a cover attachment portion 216.

[0135] The mounting portion 210 is provided at a lower end portion of the handle holder 200. The mounting portion 210 is a portion having a “C” shape when viewed from the left side to the right. A slit of the mounting portion 210 is arranged at the front end portion. At a portion at the upper side and a portion at a lower side of the slit of the mounting portion 210, a through hole and a screw hole are provided, respectively. The through hole and the screw hole each extend in the up-down direction.

[0136] The mounting portion 210 is disposed around the bearing box 45. By inserting a lower portion of one screw 221 (FIG. 3) into each screw hole, the mounting portion 210 is integrally fixed to the bearing box 45. As the screw 221 is inserted deep into each screw hole, the inner diameter of the mounting portion 210 decreases, thereby fastening the mounting portion 210 to the outer surface of the bearing box 45. Accordingly, the handle portion 4 is attached to the main body portion 2.

[0137] The upper portion of the screw 221 is inserted into the front end portion of the handle lever 201. The handle lever 201 extends forward and rearward. The handle lever 201 is disposed at the right side of the handle holder 200. The handle lever 201 is disposed at the upper side of the gear housing 44.

[0138] By operating the handle lever 201, the screw 221 can be turned without using a tool, such as a hexagonal wrench (hex key), that is, toollessly. Accordingly, the handle portion 4 can be toollessly attached to and detached from the main body portion 2.

[0139] The upper hole portion 214 is provided at the upper end portion of the handle holder 200.

[0140] The upper hole portion 214 has one grip attachment hole 239. The grip attachment hole 239 extends rightward and leftward. A plurality of the grip attachment holes 239 may be provided.

[0141] The cover attachment portion 216 is disposed at the center in the up-down direction of the handle holder 200.

[0142] The cover attachment portion 216 is provided with a depressed portion 240 depressed rightward with respect to an adjacent part in a left surface of the handle holder 200. The cover attachment portion 216 is provided with a plurality of (two) screw holes 242 at the depressed portion 240. Each of the screw holes 242 extends rightward and leftward. The screw holes 242 are arranged in the up-down direction.

[0143] The cover attachment portion 216 does not need to be provided with the depressed portion 240. The number of the screw holes 242 may be one, or may be three or more.

[0144] The grip 202 is a portion that the user can grip. The grip 202 extends rightward and leftward. The grip 202 is parallel to the tip tool attachment portion 31. The grip 202 may be inclined with respect to the tip tool attachment portion 31. The inclined angle may be 45° or less.

[0145] The grip 202 is attached to the grip attachment hole 239 at the upper hole portion 214 of the handle holder 200. When a plurality of the grip attachment holes 239 are provided, the grip 202 may be attached to any one of the grip attachment holes 239.

[0146] FIG. 4 is an exploded perspective view of the rear side of the cover 6. FIG. 5 is an exploded perspective view of the lower side of the cover 6. FIG. 6 is a vertical cross-sectional view of the cover 6 at the center in the right-left direction. FIG. 7 is a perspective view of the front side of the cover 6.

[0147] The cover 6 covers the rear portion of the sanding wheel 32. The cover 6 is attached to the handle portion 4. The cover 6 may be attached to the main body portion 2.

[0148] The cover 6 includes a main cover 300, an auxiliary cover 302, and a brush 304.

[0149] The brush 304 is illustrated in only FIG. 5 and FIG. 6.

[0150] The main cover 300 is made of plastic, and includes a main cover main body 310, a first protrusion portion 311, a main cover supporting portion 312, and a rail portion 314 as a portion to which the auxiliary cover is attached.

[0151] The main cover 300 covers a part of or the whole of the upper side of the sanding wheel 32. The main cover 300 overlaps the whole or the most part of the sanding wheel 32 when viewed downward from the upper side.

[0152] The main cover main body 310 has a curved plate shape. The main cover main body 310 has a cylindrical surface shape.

[0153] The main cover main body 310 covers the upper side and the rear upper side of the sanding wheel 32, that is, the user side of the sanding wheel 32. The main cover main body 310 covers the right upper side, that is, the main cover supporting portion 312 side of the sanding wheel 32.

[0154] The main cover main body 310 has a lower surface on which a plurality of ribs 317 are provided. The ribs 317 are arranged in a grid pattern. A part or all of the ribs 317 may be omitted. The ribs 317 may be arranged in a pattern other than the grid pattern.

[0155] As illustrated in FIG. 7, the first protrusion portion 311 protrudes forward from a right lower portion of a front surface portion of the main cover main body 310. The first protrusion portion 311 has a curved front surface. The first protrusion portion 311 is rounded.

[0156] The first protrusion portion 311 may be provided at a portion other than the right lower portion of the front surface portion of the main cover main body 310. A plurality of the first protrusion portions 311 may be provided, or the first protrusion portion 311 may be omitted.

[0157] The main cover supporting portion 312 is provided at the right side of the main cover main body 310. The main cover supporting portion 312 has a bifurcated shape open to the right side.

[0158] The main cover supporting portion 312 is in contact with the front surface, the left surface, and the rear surface of the handle holder 200 at the center in the up-down direction. The right surface portion of the main cover supporting portion 312 has a shape similar to that of the left surface portion of the depressed portion 240 of the cover attachment portion 216. The right surface portion of the main cover supporting portion 312 is inserted into the depressed portion 240.

[0159] The main cover supporting portion 312 is provided with a plurality of (two) screw holes 313. Each of the screw holes 313 extends rightward and leftward. The screw holes 313 are arranged in the up-down direction. The number of the screw holes 313 may be one, or may be three or more.

[0160] The main cover supporting portion 312 has a right wall portion integrally fixed to the handle holder 200 with two screws 318 (FIG. 1 and FIG. 3) inserted from the left side to the right. Each of the screws 318 extends rightward and leftward. Each of the screws 318 is inserted into the corresponding screw holes 242, 313. The number of the screws 318 may be one, or may be three or more.

[0161] The cover 6 is attached to the cover attachment portion 216 of the handle holder 200. By removing each of the screws 318, the cover 6 can be removed from the handle holder 200.

[0162] The rail portion 314 is formed continuously with a lower side portion of the main cover main body 310. The rail portion 314 has a thickness thicker than a thickness of the lower side portion of the main cover main body 310.

[0163] The rail portion 314 has a rail shape. The rail portion 314 extends rightward and leftward.

[0164] The auxiliary cover 302 is made of plastic, and includes an auxiliary cover main body 320, a dust discharge port 322, a first groove portion 324 as an auxiliary cover attachment portion, and a second groove portion 326 as a portion to which the brush is attached.

[0165] The auxiliary cover 302 covers a part or the whole of the rear side of the sanding wheel 32. The auxiliary cover 302 overlaps the whole or the most part of the sanding wheel 32 when viewed forward from the rear side. The auxiliary cover 302 is separable from the main cover 300, the main body portion 2, and the handle portion 4. The main body portion 2 and the handle portion 4 can be considered as a part of the wheel sander 1 other than the cover 6 for the sanding wheel 32. The auxiliary cover 302 is separated from the main cover 300. The auxiliary cover 302 may collaborate with the main cover 300, and may overlap with the whole or the most part of the sanding wheel 32 when viewed forward from the rear side.

[0166] The auxiliary cover main body 320 has a curved plate shape. The auxiliary cover main body 320 has a flared shape expanding forward.

[0167] The auxiliary cover main body 320 covers the lower rear side of the sanding wheel 32, that is, the user side of the sanding wheel 32. The auxiliary cover main body 320 covers the lower right side, that is, the main body portion 2 side of the sanding wheel 32.

[0168] The dust discharge port 322 has a cylindrical shape. The dust discharge port 322 projects rearward from the center portion of the auxiliary cover main body 320.

[0169] The dust discharge port 322 is communicated with a space at the front side of the auxiliary cover main body 320.

[0170] The dust discharge port 322 may have another shape, such as a polygonal cylindrical shape. The dust discharge port 322 may project rearward from a portion other than the center portion of the auxiliary cover main body 320. Further, the auxiliary cover 302 does not need to be provided with the dust discharge port 322.

[0171] The first groove portion 324 is continuous with an upper side portion of the auxiliary cover main body 320. The first groove portion 324 extends rightward and leftward, and is depressed downward. At a left end of the first groove portion 324, a wall body is disposed. The left end of the first groove portion 324 is closed. The left end of the first groove portion 324 does not need to be closed. The first groove portion 324 is provided with a plurality of (four) holes 330 and a plurality of (eight) ribs 332.

[0172] The holes 330 are provided at a front wall portion of the first groove portion 324. Each of the holes 330 extends forward and rearward. The holes 330 are arranged in the right-left direction. The position of the rightmost hole 330 corresponds to the position of the first protrusion portion 311. In more detail, the position of the right side portion of the rightmost hole 330 corresponds to the position of the right end portion of the first protrusion portion 311. The number of the holes 330 may be three or less or five or more, or the hole 330 may be omitted. The arrangement of at least one of the hole 330 and the first protrusion portion 311 may be an arrangement other than the above-described one.

[0173] Four of the eight ribs 332 are provided at the upper side of the corresponding holes 330. The ribs 332 extend rightward and leftward, and project rearward, that is, to the inside of the first groove portion 324. The holes 330 are provided to facilitate formation of the ribs 332.

[0174] The other four of the eight ribs 332 are provided to be opposed to the four ribs 332. The other four ribs 332 extend rightward and leftward, and project forward, that is, to the inside of the first groove portion 324. The number of the ribs 332 may be seven or less, or nine or more.

[0175] A distance between a pair of the ribs 332 facing one another is narrower than the thickness of the rail portion 314, and same as or slightly narrower than a thickness of the lower side portion of the main cover main body 310.

[0176] The second groove portion 326 is continuous with a lower side portion of the auxiliary cover main body 320. The second groove portion 326 extends rightward and leftward, and is depressed upward. At a left end of the second groove portion 326, a wall body is disposed. The left end of the second groove portion 326 is closed. The left end of the second groove portion 326 does not need to be closed. A right end of the second groove portion 326 may be closed.

[0177] The second groove portion 326 is provided with a plurality of (three) holes 340, a plurality of (six) ribs 342, and a plurality of (two) second protrusion portions 344.

[0178] The holes 340 are provided at a front wall portion of the second groove portion 326. Each of the holes 340 extends forward and rearward. The holes 340 are arranged in the right-left direction. The number of the holes 340 may be two or less or four or more, or the hole 340 may be omitted.

[0179] Three of the six ribs 342 are provided at a lower portion of the part between the corresponding holes 340. The ribs 342 extend rightward and leftward, and project rearward, that is, to the inside of the second groove portion 326. The holes 340 are provided to facilitate formation of the ribs 342.

[0180] The other three of the six ribs 342 are provided to be opposed to the three ribs 342. The other three ribs 342 extend rightward and leftward, and project forward, that is, to the inside of the second groove portion 326. The number of the ribs 342 may be five or less, or seven or more.

[0181] FIG. 8 is a partial bottom view of the auxiliary cover 302.

[0182] The second protrusion portions 344 are provided at the left side of the leftmost pair of ribs 342.

[0183] Each of the second protrusion portions 344 protrudes to the inside of the second groove portion 326. The second protrusion portions 344 face to one another.

[0184] The second protrusion portion 344 may be provided at a position other than the left side of the leftmost pair of ribs 342. The second protrusion portions 344 do not need to face to one another. The number of the second protrusion portions 344 may be one or three or more, or the second protrusion portion 344 may be omitted.

[0185] The brush 304 includes a base portion 350 as a brush attachment portion and bristles 352.

[0186] The brush 304 is separable from the main cover 300, the auxiliary cover 302, the main body portion 2, and the handle portion 4. The brush 304 is separated from the main cover 300, and separated from the auxiliary cover 302.

[0187] The base portion 350 is made of steel plate, has a rod shape, and extends rightward and leftward. The base portion 350 has a rail shape. The base portion 350 is formed by bending 180° in the short side direction.

[0188] The bristles 352 are a collection of bristles, and held by the base portion 350 in a state of being divided into a plurality of bundles arranged in the right-left direction. The bristles 352 extend downward from the base portion 350. The bristles 352 is simply illustrated in a plate shape in the drawing. The bristles 352 are a sweeping portion configured to sweep away the dust.

[0189] The brush 304 may include one or more plate-shaped elastic bodies or one or more slit plate-shaped elastic bodies as a sweeping portion instead of the bristles 352 or together with the bristles 352.

[0190] A distance between a pair of the ribs 342 facing one another in the second groove portions 326 of the auxiliary cover 302 is narrower than a size in the front-rear direction of the base portion 350 of the brush 304, and same as or wider than a size in the front-rear direction of a root portion, that is, an upper end portion of the bristles 352.

[0191] A distance between the second protrusion portions 344 of the second groove portion 326 is same as a size in the front-rear direction of the base portion 350 or slightly narrower than the size.

[0192] An operation example of the wheel sander 1 of the first embodiment is described.

[0193] A user attaches the charged battery 18 to the battery mounting portion 16.

[0194] The user attaches the sanding wheel 32 to the tip tool attachment portion 31. The sanding wheel 32 is attached by inserting the tip tool attachment portion 31 through the center hole 32H and slightly pushing the sanding wheel 32 at last. At this time, the holding member 106 is automatically fixed.

[0195] When the user operates the main switch 26, the main switch 26 turns on. Then, the controller 20 performs a control to supply electric power of the battery 18 to the motor 12 such that the motor shaft 50 rotates at a speed corresponding to the rotation position of the speed adjustment dial 24. Thus, the motor 12 is driven at the speed corresponding to the rotation position of the speed adjustment dial 24. The rotation direction of the motor shaft 50 may be switchable.

[0196] The rotation of the motor shaft 50 rotates the fan 14, and exhaust air to an exhaust port (not illustrated) forms airflow (wind) inside the main body portion 2.

[0197] The wind cools internal mechanisms including the motor 12 of the wheel sander 1.

[0198] Further, the rotation force of the motor shaft 50 is transmitted to the spindle 30 and the sanding wheel 32 through deceleration by the bevel gear.

[0199] The user holds the grip portion G of the main body portion 2 with his / her right hand, and holds the grip 202 of the handle portion 4 with his / her left hand. The user can remove the handle portion 4 as necessary.

[0200] Then, the user puts the sanding surface P of the rotating sanding wheel 32 against a portion to be worked of the workpiece. Thus, the portion to be worked of the workpiece is sanded by the sanding wheel 32.

[0201] The user can change the way of putting the sanding wheel 32 against the portion to be worked, that is, the position, the range, and the like of putting the sanding wheel 32 against the portion to be worked corresponding to the entire shape of the portion to be worked as necessary.

[0202] When the cover 6 including the main cover 300, the auxiliary cover 302, and the brush 304 is attached during the sanding, reaching of the dust generated from the workpiece to the user side can be suppressed. The user can connect a dust collector (not illustrated) to the dust discharge port 322 of the auxiliary cover 302. In the case, the dust is more efficiently collected by the cover 6. Further, the user can sweep out the dust accumulated on the workpiece by the brush 304. The user may attach a dust bag to the dust discharge port 322 instead of the dust collector.

[0203] The user can attach the cover 6 in a state where the auxiliary cover 302 and the brush 304 are removed as necessary. In the case, the cover 6 includes only the main cover 300. For example, conventionally, when it is not necessary to connect the dust collector to the cover, the user needs to remove the whole cover with the dust discharge port and attach the whole of a separately prepared cover without the dust discharge port. In contrast, in the wheel sander 1, when it is not necessary to connect the dust collector, the user can immediately perform the next work while the cover 6 with only the main cover 300 is left only by removing the auxiliary cover 302 with the dust discharge port 322 from the main cover 300.

[0204] Further, the user can attach the cover 6 in a state where the brush 304 is removed as necessary. For example, the user removes the brush 304 when an easily scratched workpiece is processed. Since the left end portion of the second groove portion 326 is closed, the user removes the auxiliary cover 302 once, then removes the brush 304, and attaches the auxiliary cover 302 to the rail portion 314 of the main cover 300. In the case, the deviation and the coming-off of the brush 304 during the work are more suppressed. The brush 304 may be configured to be removed by the user while the auxiliary cover 302 is left to be attached without closing the left end portion of the second groove portion 326. A plurality of kinds of the brushes 304 may be provided, and the brush 304 may be replaceable with another kind of the brush 304.

[0205] The auxiliary cover 302 can be easily attached only by sliding the auxiliary cover 302 from the left side to the right with respect to the main cover 300.

[0206] At this time, the rail portion 314 of the main cover 300 relatively moves inside the first groove portion 324 of the auxiliary cover 302. The ribs 332 of the first groove portion 324 support the upper surface portion of the rail portion 314 to suppress the deviation and the coming-off of the auxiliary cover 302.

[0207] When sliding of the auxiliary cover 302 is completed in which the position of the auxiliary cover 302 is at the mounting position to the main cover 300 in the right-left direction, the first protrusion portion 311 of the main cover 300 is caught by the right side portion of the rightmost hole 330 of the auxiliary cover 302. The rail portion 314 of the main cover 300 is held by the first groove portion 324 of the auxiliary cover 302. Accordingly, the auxiliary cover 302 is fixed to the main cover 300 in the state where the deviation and the coming-off are suppressed. The auxiliary cover 302 can be toollessly attached.

[0208] Immediately before the auxiliary cover 302 reaches the attachment position and at the beginning of the slide for removing the auxiliary cover 302 from the mounting position, at least one of the right side portion of the rightmost hole 330 of the auxiliary cover 302 and the first protrusion portion 311 slightly deforms to allow the relative move of the auxiliary cover main body 320 with respect to the main cover 300.

[0209] The brush 304 can be easily attached only by sliding the brush 304 from the right side to the left with respect to the auxiliary cover 302.

[0210] At this time, the rail-shaped base portion 350 of the brush 304 relatively moves inside the second groove portion 326 of the auxiliary cover 302. The ribs 342 of the second groove portion 326 support the lower surface portion of the base portion 350 to suppress the deviation and the coming-off of the brush 304.

[0211] When sliding of the brush 304 is completed in which the position of the brush 304 is at the brush mounting position to the auxiliary cover 302 in the right-left direction, the second protrusion portions 344 of the second groove portion 326 hold the left end portion of the base portion 350 of the brush 304. At this time, the left end portion of the base portion 350 is pressed-in between the second protrusion portions 344. The base portion 350 of the brush 304 is movably inserted into the second groove portion 326 of the auxiliary cover 302. Accordingly, the brush 304 is fixed to the auxiliary cover 302 in the state where the deviation and the coming-off are suppressed. The brush 304 can be toollessly attached.

[0212] Immediately before the brush 304 reaches the brush mounting position and at the beginning of the slide for removing the brush 304 from the brush mounting position, the left end portion of the base portion 350 and the second protrusion portions 344 elastically recover from the deformation due to the press-in to allow the relative move of the brush 304 with respect to the auxiliary cover 302.

[0213] When the sanding is finished, the user stops the forward slide operation of the main switch 26 to turn off the motor 12. At this time, the sanding wheel 32 stops.

[0214] The user removes at least any of the sanding wheel 32, the battery 18, the cover 6, and the handle portion 4 as necessary.

[0215] Especially, as illustrated in FIG. 1, when viewed from the left side to the right, the main cover 300, the auxiliary cover 302, or the brush 304 does not overlap with the sanding wheel 32. Specifically, the portion in the left side with respect to the tip tool attachment portion 31 as a portion through which the sanding wheel 32 passes at the attachment and detachment is opened without being covered with the main cover 300, the auxiliary cover 302, or the brush 304. Accordingly, the sanding wheel 32 can be easily attached and detached without removing the cover 6 once.

[0216] The embodiment of the disclosure is not limited to the above-described first embodiment or the modifications, and further, for example, changes as described below can be made as necessary.

[0217] A groove portion may be provided instead of the rail portion 314 of the main cover 300, and a rail portion may be provided instead of the first groove portion 324 of the auxiliary cover 302. Specifically, the auxiliary cover 302 may be held by the main cover 300.

[0218] A rail portion may be provided instead of the second groove portion 326 of the auxiliary cover 302, and a groove portion may be provided at the base portion 350 of the brush 304. Specifically, the auxiliary cover 302 may be held by the brush 304.

[0219] The main cover 300 may be removably attachable to the auxiliary cover 302 by engagement other than engagement between the rail-shaped portion and the groove-shaped portion, such as one or more pawls and their hooks. The auxiliary cover 302 may be removably attachable to the brush 304 by engagement other than engagement between the rail-shaped portion and the groove-shaped portion.

[0220] The main cover 300 may be removably attachable to the handle portion 4 or the main body portion 2 by engagement other than screws.

[0221] The auxiliary cover 302 may be removably attachable to the main body portion 2, the handle portion 4, or the brush 304. When the auxiliary cover 302 is removably attachable to the main body portion 2 or the handle portion 4, it can be considered that the wheel sander 1 includes a plurality of covers for the sanding wheel 32, and at least one cover is removably attachable. The brush 304 may be removably attachable to the main body portion 2, the handle portion 4, or the main cover 300.

[0222] A deceleration mechanism from the motor shaft 50 to the sanding wheel 32 in the wheel sander 1 may be changed to a deceleration mechanism other than the pinion portion 52 and the bevel gear.

[0223] The wheel sander 1 may be driven by alternate current of commercial power supply by including a power supply cord instead of the battery mounting portion 16. The material of at least any of various kinds of cases and the housing may be changed to a resin, a metal, a composite thereof, or the like. The section of the housing 10 may be changed from the above-described one. Additionally, at least any of various kinds of members, the number of portions, an installation, the material, the arrangement, a structure, a format, and the like may be changed as necessary.

[0224] Further, the above-described first embodiment or its modifications may be applied to other portable machining devices. For example, the above-described embodiment or its modifications may be applied to a grinder. Alternatively, the above-described embodiment or its modifications may be applied to a stationary, that is, fixed machining device instead of a handheld machining device.

[0225] Next, the second embodiment of the disclosure is described.

[0226] FIG. 9 is a partial enlarged perspective view of a wheel sander according to the second embodiment.

[0227] The wheel sander according to the second embodiment is configured similarly to the first embodiment excluding whether or not a lid 400 is provided. For the parts configured similarly to the first embodiment, the reference numerals same as those in the first embodiment are attached as necessary, and the explanation is omitted.

[0228] The wheel sander according to the second embodiment includes the lid 400.

[0229] The lid 400 is made of plastic and has a closed-bottomed cylindrical shape. The lid 400 is attachably and detachably engaged with a rear end portion of the dust discharge port 322 of the auxiliary cover 302.

[0230] The lid 400 closes the dust discharge port 322 when attached to the dust discharge port 322.

[0231] When the cover 6 including the main cover 300, the auxiliary cover 302, and the lid 400 is attached during the sanding by the wheel sander of the second embodiment, reaching of the dust generated from the workpiece to the user side can be suppressed. Especially, reaching of the dust from the dust discharge port 322 of the auxiliary cover 302 to the user side is suppressed by the lid 400.

[0232] The user can connect a dust collector (not illustrated) to the dust discharge port 322 from which the lid 400 is removed. In the case, the dust is more efficiently collected by the cover 6.

[0233] The second embodiment has a modification similar to that of the first embodiment as necessary.

[0234] The lid 400 may be coupled to the auxiliary cover 302 by a coupling portion, such as a code or a hinge.

[0235] Subsequently, the third embodiment of the disclosure is described.

[0236] FIG. 10 is a partial enlarged cross-sectional view of an auxiliary cover of a wheel sander according to the third embodiment.

[0237] The wheel sander according to the third embodiment is configured similarly to the first embodiment excluding the auxiliary cover. For the parts configured similarly to the first embodiment, the reference numerals same as those in the first embodiment are attached as necessary, and the explanation is omitted.

[0238] A first groove portion 504 continuous with an upper side portion of an auxiliary cover main body 320 of an auxiliary cover 500 in the wheel sander according to the third embodiment includes a front groove 510 and a rear groove 512.

[0239] Each of the front groove 510 and the rear groove 512 is configured similarly to the first groove portion 324 of the first embodiment. However, a rear wall portion of the front groove 510 is continuously coupled to a front wall portion of the rear groove 512.

[0240] A depressed direction of the groove in the rear groove 512 has an angle with respect to a depressed direction of the groove in the front groove 510 when viewed from the left side to the right.

[0241] By inserting the rail portion 314 of the main cover 300 into the front groove 510 of the auxiliary cover 500 in the wheel sander of the third embodiment, the auxiliary cover 500 is attached to the main cover 300 similarly to the first embodiment.

[0242] By inserting the rail portion 314 into the rear groove 512, the auxiliary cover 500 is attached to the main cover 300 in a posture more upward toward the rear compared with the case where the rail portion 314 is inserted into the front groove 510.

[0243] The first groove portion 504 of the third embodiment functions as an auxiliary cover attachment angle adjustment portion that can adjust an attachment angle of the auxiliary cover 500 by the front groove 510 and the rear groove 512. For example, when a distal end portion of a hose of a dust collector is to be arranged at a more upper side, the user can insert the rail portion 314 into the rear groove 512 to make the posture of the dust discharge port 322 more upward toward the rear. The user can change the posture of the auxiliary cover 500 corresponding to the dust scattering direction. In the first groove portion 504, three rows or more of grooves may be provided by further adding one or more grooves to the front groove 510 and the rear groove 512.

[0244] The third embodiment has a modification similar to that of the first embodiment and the second embodiment as necessary.

[0245] A shaft portion rotatable around the center axis in the right-left direction may be provided at the lower side of the first groove portion 324 of the first embodiment to allow the first groove portion 324 to rotate with respect to the auxiliary cover main body 320 around the shaft portion. In the case, the shaft portion functions as an angle adjustment portion that can adjust an attachment angle of the auxiliary cover 302.

[0246] Further, a brush attachment angle adjustment portion that can adjust an attachment angle of the brush 304 to the auxiliary cover 302 may be provided.

[0247] Further, a main cover attachment angle adjustment portion that can adjust an attachment angle of the main cover 300 to the handle portion 4 or the main body portion 2 may be provided.

[0248] It is explicitly stated that all features disclosed in the description and / or the claims are intended to be disclosed separately and independently from each other for the purpose of original disclosure as well as for the purpose of restricting the claimed invention independent of the composition of the features in the embodiments and / or the claims. It is explicitly stated that all value ranges or indications of groups of entities disclose every possible intermediate value or intermediate entity for the purpose of original disclosure as well as for the purpose of restricting the claimed invention, in particular as limits of value ranges.

Claims

1. A cover for a portable machining device, comprising:a main cover that covers a part or whole of an upper side of a tip tool of the portable machining device; andan auxiliary cover that is separable from the main cover and covers a part or whole of a rear side of the tip tool, whereinthe auxiliary cover is removably attachable.

2. The cover for a portable machining device according to claim 1, whereinthe auxiliary cover is removably attachable to the main cover.

3. The cover for a portable machining device according to claim 1, whereinthe auxiliary cover holds the main cover, or the main cover holds the auxiliary cover.

4. The cover for a portable machining device according to claim 1, further comprisinga brush separable from the main cover and the auxiliary cover, whereinthe brush is removably attachable.

5. The cover for a portable machining device according to claim 4, whereinthe auxiliary cover holds the brush, or the brush holds the auxiliary cover.

6. The cover for a portable machining device according to claim 1, whereinthe main cover is removably attached to a handle portion of the portable machining device.

7. The cover for a portable machining device according to claim 1, whereinthe auxiliary cover is provided with a dust discharge port.

8. The cover for a portable machining device according to claim 7, further comprisinga lid removably attachable to the dust discharge port.

9. The cover for a portable machining device according to claim 2, whereinan attachment angle of the auxiliary cover to the main cover is adjustable.

10. The cover for a portable machining device according to claim 1, whereinthe tip tool is removably attachable, andat least one of the auxiliary cover and the main cover does not cover a portion through which the tip tool passes at attachment and detachment.

11. The cover for a portable machining device according to claim 2, whereinthe auxiliary cover is slid to be attached to the main cover.

12. The cover for a portable machining device according to claim 5, whereinthe brush is slid to be held by the auxiliary cover.

13. The cover for a portable machining device according to claim 5, whereinthe auxiliary cover is provided with a groove portion, andthe groove portion holds the brush.

14. The cover for a portable machining device according to claim 5, whereinthe brush includes a brush attachment portion and bristles, andthe auxiliary cover holds the brush attachment portion, or the brush attachment portion holds the auxiliary cover.

15. A portable machining device comprisingthe cover for a portable machining device according to claim 1.

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