Portable processing machine

Abstract

To provide a portable processing machine whose cover can be opened easily.SOLUTION: A portable processing machine comprises a shaft having a first axis that is parallel to a lateral direction, a spindle, and a cover part covering at least a portion of a tip tool mounted on the spindle. The cover part includes a first cover portion, a second cover portion, and a base portion. The first cover is configured to be able to turn around the first axis in a first direction in which the cover gets away from a contact surface of the base part and in a second direction which is opposite to the first direction. The base part is moved to a first side in the lateral direction to be disengaged from the second cover. The base part is configured to be restricted from moving to the first side in the lateral direction, when an angle of turning in the first direction of the first cover is in a first angle range, and to be permitted to move to the first side so as to be disengaged from the second cover, when the angle is over the first angle range.SELECTED DRAWING: Figure 26

Description

[Technical field]

[0001] The present disclosure relates to a portable processing machine. [Background technology]

[0002] As a type of portable processing machine, a wall chaser for cutting grooves in workpieces such as walls, floors, and ceilings is known. For example, the wall chaser described in Patent Document 1 includes a base portion for contacting the workpiece and a main body portion arranged on one side of the base portion. The main body portion includes a housing for accommodating a motor and a gear mechanism, and a cover body for covering a cutting tool. When the user rotates (swings) the main body portion in a direction approaching the base portion while the base portion is in contact with the workpiece and the motor is rotating, the rotating cutting tool protrudes beyond the base portion. In this state, a groove is formed in the workpiece by translating the wall chaser in a direction perpendicular to the rotation axis of the cutting tool. The groove thus formed is used, for example, for electrical wiring. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] US Patent Application Publication No. 2006 / 0191387 [Patent Document 2] US Patent Application Publication No. 2006 / 0164449 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the wall chaser described above leaves room for improvement. For example, in this type of tool, the cutting tool is replaced by opening the cover part including the base part and the cover body, so the structure of the cover part may be complicated or it may take time to open the cover part. Therefore, not only in the wall chaser, but also in portable processing machines configured so that the tip tool is partially covered by the cover part, a technology that allows the cover part to be easily opened is required. [Means for solving the problem]

[0005] According to a first aspect of the present disclosure, a portable processing machine is provided. The portable processing machine includes a spindle, a shaft, and a cover portion. The spindle is configured to be rotatable around an output shaft that defines a left-right direction of the portable processing machine. The spindle has a tool mounting portion configured to removably mount a disk-shaped tool tip. The shaft has a first axis extending parallel to the output shaft. The cover portion is configured to at least partially cover the tool tip mounted on the tool mounting portion. The cover portion includes a first cover, a second cover, and a base portion. The first cover includes a first cylindrical portion provided around the shaft. The first cover is configured to cover a first side in the left-right direction with respect to the tool tip mounted on the tool mounting portion. The second cover includes a second cylindrical portion provided around the shaft. The second cover is configured to cover a second side opposite to the first side in the left-right direction with respect to the tool tip mounted on the tool mounting portion. The base portion includes a third cylindrical portion disposed around the shaft between the first cylindrical portion and the second cylindrical portion. The base portion has an abutment surface for abutting against a workpiece, and a through hole provided in the abutment surface through which the tool tip can be exposed. The base portion is configured to be engaged with the second cover in the left-right direction. When a direction perpendicular to the abutment surface is defined as a vertical direction of the portable processing machine, the first cover and the second cover are disposed above the abutment surface. The first cover is configured to be rotatable around the first axis in a first direction away from the abutment surface and a second direction opposite to the first direction. The base portion is configured to be disengaged from the second cover by being moved to the first side in the left-right direction. The cover portion is configured to restrict the movement of the base portion to the first side when a rotation angle of the first cover in the first direction is within a first angle range with respect to a reference position. The cover portion is configured such that, when the rotation angle of the first cover in the first direction exceeds the first angle range, the base portion is permitted to move toward the first side and the engagement with the second cover in the left-right direction is released.

[0006] According to this aspect, the engagement between the second cover and the base portion can be released by rotating (rotating, swinging) the first cover in the first direction beyond the first angle range, so that the cover portion can be easily opened. [Brief description of the drawings]

[0007] [Figure 1] FIG. 2 is a perspective view of a wall chaser according to one embodiment, showing a state in which the main body is at top dead center. [Diagram 2] FIG. 2 is a left side view of the wall chaser, showing the state in which the main body is at the top dead center. [Diagram 3] FIG. 2 is a right side view of the wall chaser, showing the state in which the main body is at the top dead center. [Figure 4] FIG. 2 is a rear view of the wall chaser, showing the state in which the main body is at the top dead center. [Diagram 5] FIG. 2 is a perspective view of the wall chaser with the battery attached, showing the main body at the bottom dead center. [Figure 6] FIG. 2 is a left side view of the wall chaser, showing the state in which the main body is at the bottom dead center. [Figure 7] FIG. 2 is a right side view of the wall chaser, showing the state in which the main body is at the bottom dead center. [Figure 8] FIG. 2 is a partial bottom view of the wall chaser. [Figure 9] FIG. 2 is a top view of the wall chaser. [Figure 10] 10 is a cross-sectional view taken along line XX in FIG. 9. [Figure 11] FIG. 4 is a cross-sectional view taken along line XI-XI in FIG. [Figure 12] 10 is a cross-sectional view of the shaft and its vicinity taken along line XII-XII in FIG. 9. [Figure 13] 10 is a cross-sectional view taken along line XIII-XIII in FIG. 9, illustrating a current path from the cutting tool to the second cover. [Figure 14]FIG. 14 is a partially enlarged view of FIG. 13, showing the periphery of the bearing box and the first connecting portion. [Figure 15] FIG. 14 is a partially enlarged view of FIG. 13, showing the periphery of the second connecting portion and the third connecting portion. [Figure 16] FIG. 13 is a diagram mainly showing a right portion of the wall chaser, and is a diagram for explaining a first protruding portion and a second protruding portion. [Figure 17] FIG. [Figure 18] FIG. 4 is another view showing the gear housing body. [Figure 19] 4 is a diagram showing a shaft and each cylindrical portion provided around the shaft. FIG. [Figure 20] FIG. [Figure 21] FIG. [Figure 22] FIG. 13 is a rear view of the third cylindrical portion and its surroundings. [Diagram 23] FIG. 13 is a left view of the third cylindrical portion and its periphery. [Figure 24] 1A is a partial schematic diagram of the shaft area in the cover portion viewed from the left, illustrating (a) the state before the first cover is rotated, and (b) the state after the first cover has been rotated in the first direction beyond the first angle range. FIG. [Diagram 25] 1A is a partial schematic diagram of the shaft area in the cover portion viewed from above, illustrating (a) the state before the first cover is rotated, and (b) the state after the first cover has been rotated in the first direction beyond the first angle range. FIG. [Figure 26] 11 is a left side view of the cover portion, showing a state in which the first cover has been rotated in a first direction beyond a first angle range, and the base portion has been rotated in a second direction. FIG. [Figure 27] 11 is a right side view of the cover portion, showing a state in which the first cover has been rotated in a first direction beyond a first angle range, and the base portion has been rotated in a second direction. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] In one non-limiting embodiment of the present disclosure, the base portion may be configured to be rotatable in the second direction when the base portion is disengaged from the second cover in the left-right direction. According to this embodiment, when the base portion is disengaged from the second cover, the base portion can be rotated in the second direction, so that the tool bit can be exposed to the second side, making it easier to replace the tool bit.

[0009] In addition to or instead of the above embodiment, the first cylindrical portion may include a first contact portion provided on the second side in the left-right direction. The third cylindrical portion may include a second contact portion provided on the first side in the left-right direction. When a rotation angle of the first cover in the first direction is within the first angle range, the first contact portion may be configured to contact the second contact portion in the left-right direction and restrict movement of the base portion toward the first side. According to this embodiment, by providing the first contact portion on the first cover and the second contact portion on the base portion, it is possible to restrict movement of the base portion in the left-right direction.

[0010] In addition to or instead of the above embodiment, when the rotation angle of the first cover in the first direction exceeds the first angle range, the first abutment portion may be moved to a position different from the second abutment portion in a circumferential direction centered on the first axis, thereby allowing the base portion to move toward the first side. According to this embodiment, the first contact portion and the second contact portion of the base portion are released from contact with each other in conjunction with the rotation of the first cover in the first direction, so that the base portion can be allowed to move in the left-right direction.

[0011] In addition to or instead of the above embodiment, the first cylindrical portion may include a first recess provided on the second direction side with respect to the first contact portion. When a rotation angle of the first cover in the first direction exceeds the first angle range, the first recess may be configured to align with the second contact portion in the left-right direction. In conjunction with the first recess and the second contact portion being aligned in the left-right direction, the base portion may be configured to be allowed to move toward the first side. According to this embodiment, since the first recess is provided on the second direction side of the first contact portion, when the rotation angle of the first cover exceeds the first angle range, the second contact portion can move to the first recess (to the first side). Therefore, the base portion can be allowed to move in the left-right direction in conjunction with the rotation of the first cover.

[0012] In addition to or instead of the above embodiment, the third cylindrical portion may further include a third abutment portion provided on the first direction side with respect to the second abutment portion and recessed toward the second side with respect to the second abutment portion. The third abutment portion may be configured to be aligned with the first abutment portion in the left-right direction when a rotation angle of the first cover in the first direction exceeds the first angle range. The third abutment portion may be configured to abut against the first abutment portion when the base portion is moved toward the first side. According to this embodiment, when the rotation angle of the first cover exceeds the first angle range, the base portion can be moved toward the first side until the third contact portion contacts the first contact portion.

[0013] In addition to or instead of the above embodiment, the base part may include a base main body including the abutment surface and the through hole, and an auxiliary cover. The auxiliary cover may be connected to the base main body and disposed on the upper side of the base main body and inside the first cover and the second cover in the left-right direction. The auxiliary cover may have a first engagement part that engages with the second cover in the left-right direction. The second cover may have a second engagement part that engages with the auxiliary cover in the left-right direction. The first engagement part may be configured to engage with the second engagement part at least when the rotation angle of the first cover is within the first angle range, and to be disengaged from the second engagement part as the first cover is rotated beyond the first angle range and the base part is moved toward the first side. According to this embodiment, the base portion and the second cover can be engaged in the left-right direction by the first engaging portion and the second engaging portion.

[0014] In addition to or instead of the above embodiment, the first cover and the second cover may be configured to be integrally rotatable in the first direction and the second direction, and to project the tool bit downward from the through hole by being rotated in the first direction. The cover portion may be provided with a depth guide for regulating a downward projection depth of the tool bit relative to the contact surface. The depth guide may include a guide groove and a stopper. The guide groove may be provided in an arc shape on the second cover. The stopper may be configured to be fixable to a predetermined position within the guide groove and to regulate the rotation of the second cover in the second direction. The first engagement portion may be a protrusion protruding from the auxiliary cover to the second side. The second engagement portion may be the guide groove. According to this embodiment, the guide groove of the depth guide can be utilized to engage the base portion with the second cover, thereby simplifying the configuration of the portable processing machine.

[0015] In addition to or instead of the above embodiment, the device may further include a biasing member provided around the shaft and biasing the second cover in the first direction. The protrusion may restrict movement of the second cover in the first direction. According to this embodiment, the protrusion can fulfill the function of engaging the second cover with the base portion in the left-right direction, and the function of restricting the movement of the second cover in the first direction.

[0016] In addition to or instead of the above embodiment, the vehicle may further include a first wheel provided around the shaft on the first side of the first cylindrical portion, and a second wheel provided around the shaft on the second side of the third cylindrical portion. According to this embodiment, the shaft can function as an axis for rotating the cover part and as an axis for wheels for moving the portable processing machine along a processing direction perpendicular to the left-right and up-down directions.

[0017] In addition to or instead of the above embodiment, the second cylindrical portion may have a first abutment surface provided on the first side. The third cylindrical portion may have a second abutment surface provided on the second side and abutting the first abutment surface. The portable processing machine may further include a first regulating portion provided around the shaft for regulating movement of the first cylindrical portion toward the first side, and a second regulating portion for regulating movement of the second cylindrical portion toward the second side. According to this embodiment, the entire cover portion can be prevented from moving in the left-right direction, thereby improving the processing accuracy.

[0018] In addition to or in place of the above embodiment, the portable processing machine may be a wall chaser. The tool attachment portion may include a plurality of cutting tools. According to this embodiment, a wall chaser can be provided in which the cover portion can be easily opened.

[0019] <Overall composition> Hereinafter, a wall chaser 1 as an embodiment of the present disclosure will be described with reference to Figs. 1 to 27. The wall chaser 1 is a portable processing machine for performing groove cutting processing on workpieces such as walls, floors, and ceilings. The wall chaser 1 is also called a two-row groove cutter, and can simultaneously process two rows of grooves. As shown in Figs. 1 and 2, the wall chaser 1 includes a base portion 2 and a main body portion 3. The base portion 2 includes a substantially flat base 21. The main body portion 3 is disposed on one side of the base 21. The base 21 is substantially rectangular. The surface of the base 21 opposite to the main body portion 3 is formed flat and functions as an abutment surface 23 for abutting against the workpiece (floor, ceiling, wall, etc.).

[0020] As shown in FIG. 11, the main body 3 is configured to rotate two substantially disk-shaped cutting tools 101, 102 attached to the spindle 40 around the rotation axis AX2 of the spindle 40. The rotation axis AX2 is also called the output shaft. The cutting tools 101, 102 are also called diamond blades. The cutting tools 101, 102 are arranged parallel to each other. The abutment surface 23 of the base 2 is abutted against the workpiece, and the rotating cutting tools 101, 102 protrude beyond the abutment surface 23 to the opposite side of the main body 3 as shown in FIG. 5 to FIG. 7. In this state, the wall chaser 1 is translated in a direction perpendicular to the direction in which the cutting tools 101, 102 are arranged in parallel (in other words, the extension direction of the output shaft AX2) and parallel to the abutment surface 23, thereby progressing the groove cutting process on the workpiece. The rotation direction of the cutting tools is counterclockwise when viewed from the direction of the first cover 51 (left direction). 1, 2 and 5, an arrow 8 indicating the rotation direction of the cutting tools 101, 102 is engraved on the first cover 51. In addition, an arrow 9 indicating the rotation direction of the cutting tools 101, 102 is also engraved on the gear housing 31, as shown in Figs. 3 and 7.

[0021] As a result, two linear grooves are formed in the workpiece at positions corresponding to the movement trajectories of the cutting tools 101 and 102. The portion between the two grooves is scraped off by an arbitrary tool, and finally one large groove is formed. The groove thus formed can accommodate, for example, electrical wiring.

[0022] For the sake of convenience, the machining direction in which the wall chaser 1 is moved relative to the workpiece when performing grooving is defined as the front-rear direction of the wall chaser 1. In the front-rear direction, the side closer to the output shaft AX2 is defined as the front side of the wall chaser 1, and the side farther from the output shaft AX2 is defined as the rear side of the wall chaser 1. In addition, in a direction perpendicular to the abutting surface 23 (in other words, a direction perpendicular to the front-rear direction and the output shaft AX2), the side where the main body 3 is located is defined as the upper side of the wall chaser 1, and the opposite side is defined as the lower side of the wall chaser 1. In addition, the direction perpendicular to the front-rear direction and the up-down direction is defined as the left-right direction of the wall chaser 1. In the left-right direction, the right side when viewed from the rear side to the front side is defined as the right side of the wall chaser 1, and the opposite side is defined as the left side of the wall chaser 1. In this embodiment, the direction in which the wall chaser 1 advances in grooving (hereinafter also referred to as the machining progress direction) is the direction from the front side to the rear side. However, the wall chaser 1 may be designed so that the machining direction is from the rear to the front. Alternatively, the wall chaser 1 (for example, the shape of the cutting tools 101 and 102) may be designed so that the user can select the machining direction from the front to the rear and the rear to the front depending on the situation.

[0023] As shown in FIG. 3, the main body 3 includes a cover body 50 and a main body housing 30. As shown in FIG. 1, the cover body 50 is configured to cover the left and right sides and the upper side of the cutting tools 101, 102. The cover body 50 includes a first cover 51 and a second cover 55 configured to be separable in the left and right direction. The first cover 51 constitutes the left side portion of the cover body 50. The first cover 51 is arranged to cover the left side and the upper side of the cutting tool 101. The second cover 55 constitutes the right side portion of the cover body 50. The second cover 55 is arranged to cover the right side and the upper side of the cutting tool 102.

[0024] The first cover 51 and the second cover 55 are connected in the left-right direction by a connecting portion 59. In this embodiment, a thumb screw disposed on the upper portion of the first cover 51 and the second cover 55 is used as the connecting portion 59. The first cover 51 is made of synthetic resin. The second cover 55 is made of metal.

[0025] The main body housing 30 is disposed on the right side of the cover main body 50. As shown in FIG. 3, the main body housing 30 is generally formed in a cylindrical shape and extends in the front-rear direction. The main body housing 30 includes a gear housing 31, a motor housing 37, and a controller housing 38, which are arranged in this order from front to rear. The gear housing 31 is connected to the second cover 55 in the left-right direction. In this embodiment, the gear housing 31 is formed of metal. Therefore, the gear housing 31 and the second cover 55 can be firmly connected to each other.

[0026] 11, the gear housing 31 accommodates the right portion 402 of the spindle 40 with the left portion 401 of the spindle 40 protruding into the cover body 50. The left portion 401 of the spindle 40 constitutes a tool mounting portion to which the cutting tools 101, 102 are detachably mounted. The gear housing 31 accommodates the gear mechanism 4. The gear mechanism 4 includes a small bevel gear 412 and a large bevel gear 413 that is fixed around the spindle 40 and meshes with the small bevel gear 412.

[0027] An electric motor 371 is accommodated in the motor housing 37. The motor 371 includes a motor shaft 372 rotatably supported by bearings spaced apart in the front-rear direction. The motor shaft 372 is rotatable about a rotation axis AX1 extending in the front-rear direction. The rotation axis AX1 of the motor shaft 372 intersects (is perpendicular to) the output shaft AX2. A front end of the motor shaft 372 is disposed in the gear housing 31. A small bevel gear 412 is fixed to the front end of the motor shaft 372. The motor 371 (motor shaft 372) provides a rotational driving force about the output shaft AX2 to the spindle 40 via the gear mechanism 4.

[0028] As shown in FIG. 11, an inner flange 46 is attached around the spindle 40 in the cover body 50. The inner flange 46 is a cylindrical member. The right end of the inner flange 46 protrudes in a flange-like shape toward the radially outward direction with respect to the output shaft AX2. A male screw portion is formed on the left side of the inner flange 46 in the spindle 40. A lock nut 47 is attached to the male screw portion. The cutting tool 102, at least one (six in the example of FIG. 11) annular spacer 48 provided around the sleeve 481, and the cutting tool 101 are sandwiched between the inner flange 46 and the lock nut 47, and the position of the cutting tools 101, 102 relative to the spindle 40 is fixed by tightening the lock nut 47. The distance between the cutting tools 101, 102 can be adjusted by changing the number of spacers 48 arranged between the cutting tools 101, 102. The spindle 40, the inner flange 46 around the spindle 40, the sleeve 481, the spacer 48, and the lock nut 47 are all made of metal.

[0029] 1 to 3, the base part 2 includes an auxiliary cover 22 extending from the base 21 toward the side opposite to the contact surface 23 (toward the main body part 3). The auxiliary cover 22 extends upward beyond the lower edges of the first cover 51 and the second cover 55 on the inner side of the first cover 51 and the second cover 55.

[0030] As shown in FIG. 12, the base 2 is provided at its rear end with a third cylindrical portion 25 having a hole 259 penetrating in the left-right direction. Similarly, the rear end of the first cover 51 and the rear end of the second cover 55 are provided with a first cylindrical portion 54 and a second cylindrical portion 58 having holes 549 and 589 penetrating in the left-right direction, respectively. As shown in FIG. 4, the first cylindrical portion 54, the third cylindrical portion 25, and the second cylindrical portion 58 are arranged on the upper side of the base 21 in this order from left to right. On the upper side of the base 21, a metal shaft 26 is arranged so as to penetrate the respective holes 549, 259, and 589 of the first cylindrical portion 54, the third cylindrical portion 25, and the second cylindrical portion 58. The shaft 26 extends in the left-right direction. In this embodiment, the axis AX3 of the shaft 26 is parallel to the output shaft AX2.

[0031] Wheels 271 and 272 are attached to the left and right ends of the shaft 26, respectively. The wheels 271 and 272 facilitate the movement of the wall chaser 1 when the wall chaser 1 is moved in the forward and backward directions while being pressed against the workpiece to perform processing. As shown in FIG. 12, each of the wheels 271 and 272 includes a main body 273 and a covering portion 274 that covers the main body 273. The covering portion 274 is mainly provided on the portion of the wheels 271 and 272 that contacts the workpiece. The main body 273 is made of synthetic resin. The covering portion 274 is made of metal (sheet metal). With this configuration, the wall chaser 1 of this embodiment achieves a reduction in weight of the wheels 271 and 272 and an improvement in wear resistance.

[0032] The base part 2 and the cover main body 50 (main body part 3) are configured to be rotatable around the shaft 26. The axis AX3 of the shaft 26 is also a rotation axis. As shown in FIG. 2, the main body part 3 can swing (rotate) around the rotation axis AX3 in a first direction R1 and a second direction R2. The first direction R1 is a direction in which the first cover 51 and the second cover 55 move away from the base 21. The second direction R2 is a direction opposite to the first direction R1. The second direction R2 is also a direction in which the first cover 51 and the second cover 55 move closer to the base 21 when the contact surface 23 is in contact with the workpiece.

[0033] In this embodiment, the second cover 55 is biased in a first direction R1 away from the base 21 by a torsion spring 62 (see FIG. 12) arranged to surround the periphery of the shaft 26. Therefore, in the initial state, the main body 3 is held in the position shown in FIGS. 1 to 3. The position of the main body 3 at this time is also referred to as the top dead center.

[0034] As shown in Figs. 3 and 7, a substantially arc-shaped through hole 57 is formed in the right portion of the cover body 50 (the right wall 56 of the second cover 55). Also, as shown in Fig. 21, the auxiliary cover 22 is provided with a protrusion 27 that protrudes to the right. The upper end of the protrusion 27 is located at substantially the same position as the upper edge portion 29 (see Fig. 21) of the auxiliary cover 22. The protrusion 27 protrudes into the through hole 57. The protrusion 27 can be engaged with the through hole 57. The protrusion 27 engages with the through hole 57, so that the base portion 2 and the second cover 55 are engaged in the left-right direction. When the contact surface 23 is contacted with the workpiece and the cover body 50 is rotated, the second cover 55 rotates, so that the position of the protrusion 27 with respect to the through hole 57 changes relatively.

[0035] By positioning the protrusion 27 at the lower end of the through hole 57, the position of the top dead center is determined and the lower edge of the cover body 50 is prevented from being displaced above the upper edge 29 of the auxiliary cover 22. As shown in Figures 1 to 3, when the body 3 is at the top dead center, the cutting tools 101, 102 are located above the base 21. At this time, the auxiliary cover 22 of the base 2 covers the parts of the cutting tools 101, 102 that are below the cover body 50.

[0036] The position of the lower moving end of the main body 3 (lower movable limit position) with respect to the rotational movement of the main body 3 can be variably set by the cutting depth adjustment mechanism (depth guide 63). In this embodiment, as shown in FIG. 10, the depth guide 63 includes a stopper 633 and a through hole 57. The stopper 633 is configured to be fixed to an arbitrary position of the through hole 57. In this embodiment, the stopper 633 includes an operation knob 634 located outside (right side) the second cover 55, a bolt (not shown) passing through the through hole 57 in the left-right direction, and a nut 635 located inside (left side) the second cover 55. The operation knob 634 is attached around the head of the bolt. The user can move the stopper 633 to an arbitrary position along the arc shape of the through hole 57 by operating the operation knob 634 to loosen the bolt. When the user tightens the operation knob 634, the bolt and the nut 635 tighten the second cover 55 in the left-right direction. As a result, the stopper 633 is fixed to the second cover 55 at the position to which it has been moved.

[0037] The main body 3 can be pushed down (rotated in the second direction R2) by the user until the stopper 633 abuts against the upper edge 29 of the auxiliary cover 22. In other words, the position where the depth guide 63 abuts against the upper edge 29 of the auxiliary cover 22 is the position of the lowermost moving end of the main body 3. In this embodiment, the position of the main body 3 when the main body 3 is lowered to the lowermost moving end in a state where the position of the lowermost moving end is set by the depth guide 63 to the lowest side of the movable range is also referred to as the bottom dead center. In this embodiment, the bottom dead center is the position of the main body 3 when the main body 3 is lowered to the lowermost moving end in a state where the stopper 633 is fixed to the upper end of the through hole 57.

[0038] 5 to 7 and 10, when the main body 3 is at the bottom dead point (or when the main body 3 is at the lower end of its range of motion), the blades 101, 102 partially protrude downward beyond the abutment surface 23 of the base 21 through the through-holes 24 (see FIG. 8) of the base 21. This mechanism allows the user to adjust the cutting depth of the blades 101, 102. When the user releases the force pressing the main body 3 downward while the main body 3 is at the lower end of its range of motion, the biasing force of the torsion spring 62 causes the main body 3 to return to the upper dead point.

[0039] As shown in FIG. 9, the main body 3 includes a battery mounting section 39 configured to allow a battery 200 to be detachably mounted for supplying power to the motor 371. The battery mounting section 39 is provided in the upper part of the controller housing 38. The battery mounting section 39 has a slide guide for mounting the battery and a power supply terminal 391. The battery mounting section 39 allows the battery 200 to be slidably mounted and detached from the rear side to the front side. The battery mounting section 39 is located slightly inward from the controller housing 38 in the left-right direction. The battery 200 is, for example, a DC power source with a nominal voltage of 36 volts (V) and is relatively heavy. In another embodiment, a battery with a higher nominal voltage may be adopted as the power source for the motor 371. Alternatively, a commercial power source may be used instead of the battery 200.

[0040] The main body 3 further includes a first handle 64 and a second handle 65. As shown in Figs. 6 and 7, the first handle 64 is provided on the rear side of the controller housing 38. The first handle 64 is a so-called loop handle, and includes a first grip portion 641 for a user to hold with his / her hand. An operating member (trigger 642) for starting and stopping the motor 371 is attached to the first grip portion 641.

[0041] When the user pulls the trigger 642 rearward, power is supplied from the battery 200 to the motor 371 via the controller 381 (FIG. 10) housed in the controller housing 38, and the motor 371 is started. This causes the motor shaft 372 to rotate, and the blades 101 and 102 to rotate. When the user releases the pull of the trigger 642, the power supply to the motor 371 is stopped, and the motor 371 is stopped.

[0042] The first handle 64 is attached to the rear end of the controller housing 38 so as to be rotatable about a rotation axis parallel to the rotation axis AX1 of the motor shaft 372. The first handle 64 can be selectively fixed at a position where the first grip portion 641 is approximately parallel to the output shaft AX2 as shown in Fig. 1, a position rotated 90 degrees to the right from the position shown in Fig. 1 (see Figs. 6, 7 and 9), and a position rotated 90 degrees to the left from the position shown in Fig. 1.

[0043] An intake hole 382 equipped with a filter is provided at the rear end of the controller housing 38, facing the first grip part 641. When a fan 373 (see FIG. 10) arranged in the motor housing 37 rotates, air outside the wall chaser 1 flows into the main body housing 30 from the intake hole 382 and is exhausted from an exhaust hole 301 (described later) provided in the gear housing 31. This cools the motor 371.

[0044] 4, the second handle 65 is attached to the upper part of the cover body 50 near the front end of the cover body 50. The second handle 65 is a so-called loop handle. The second handle 65 includes a second gripping portion 651 for a user to grip with his / her hand, a base portion 652, bridge portions 653, 653, a tube portion 654, a shaft (not shown), and an operation knob 655.

[0045] The second grip portion 651 extends parallel to the output shaft AX2, that is, in the left-right direction. The tubular portion 654 is a portion formed integrally with the second cover 55 so as to protrude upward from the second cover 55. The base portions 652 are disposed in the left-right direction of the tubular portion 654. The bridge portions 653, 653 connect the tubular portion 654 and the base portion 652 to the second grip portion 651 so that a gap is formed between the second grip portion 651 and the tubular portion 654 and the base portion 652. The shaft penetrates the base portion 652 and the tubular portion 654 in the left-right direction. The operation knob 655 is attached to the right end of the shaft. The second handle 65 is configured to be rotatable about the shaft when the user loosens the operation knob 655. When the user tightens the operation knob 655, the base 652 and the tube portion 654 are fixed in the left-right direction by the operation knob 655 and a nut (not shown) provided at the tip of the shaft, and the rotational position of the second handle 65 is fixed.

[0046] In this embodiment, the tubular portion 654 is made of metal and is formed integrally with the second cover 55. The gear housing 31, which is connected to the second cover 55 and accommodates the right portion 402 of the spindle 40, the spindle 40 that rotates the cutting tools 101 and 102, and a plurality of parts including the gear mechanism 4 provided around the spindle 40 are also made of metal. Therefore, if the cutting tools 101 and 102 unintentionally touch (cut) electrical wiring or the like buried in the wall during processing, a path through which an electric current flows may be formed from the cutting tools 101 and 102 to the second cover 55 and the tubular portion 654 via the spindle 40 and the parts around the spindle 40. In the wall chaser 1 of this embodiment, the second gripping portion 651, the base portion 652, and the bridge portion 653 of the second handle 65 are formed of synthetic resin. Therefore, even if the above-mentioned path of the electric current is unintentionally formed, the electric current is prevented from reaching the second gripping portion 651.

[0047] The wall chaser 1 of this embodiment further includes an insulating mechanism that cuts off the path of current flow from the cutting tools 101, 102 to the second cover 55 before the current reaches the second cover 55 (the cylinder portion 654). The insulating mechanism is realized by applying at least one insulating member to a plurality of parts interposed between the periphery of the spindle 40 and the second cover 55. The insulating mechanism in the wall chaser 1 will be described below.

[0048] <Insulation mechanism configuration> First, the gear housing 31 and the internal configuration of the gear housing 31 will be described in detail. As shown in Fig. 13, the gear housing 31 includes a gear housing main body 32 that covers the right portion 402 of the spindle 40, and a bearing box 33 that forms the bottom of the gear housing 31. The gear housing main body 32 is open at the left end and the rear end. The gear housing main body 32 accommodates the right portion 402 of the spindle 40 and a plurality of intervening members 41 (see Fig. 14) provided around the right portion 402.

[0049] As shown in Figs. 13 and 17, the gear housing 31 further has a third connecting portion 34 provided on an upper portion of the gear housing main body 32. The third connecting portion 34 is a portion that protrudes upward from the gear housing main body 32. The third connecting portion 34 is made of metal. The third connecting portion 34 is formed in a generally plate-like shape with a through-hole 341 that penetrates in the left-right direction. The third connecting portion 34 is connected to a second connecting portion 554 (described later) of the second cover 55 by a metal bolt 86.

[0050] As shown in FIG. 14, a plurality of intervening members 41 are provided around the spindle 40 in the gear housing 31. Specifically, a first bearing 411, a large bevel gear 413, a bearing retainer 414, a second bearing 415, and a washer 416, all made of metal, are arranged around the spindle 40 in this order from right to left. The spindle 40 is held in the gear housing 31 by the first bearing 411 and the second bearing 415 so as to be rotatable around the output shaft AX2. The large bevel gear 413 is fixed around the spindle 40 to the left of the first bearing 411, and meshes with the small bevel gear 412. The second bearing 415 is held in the gear housing 31 by a bearing box 33 arranged radially outward of the second bearing 415.

[0051] The bearing box 33 has a cylindrical portion 332 extending in the left-right direction, and a flange 331 protruding radially outward with respect to the output shaft AX2 at a right end of the cylindrical portion 332. The flange 331 is connected to the left end of the gear housing body 32 by a screw 335 (see FIG. 8).

[0052] Next, a connection structure between the gear housing 31 and the second cover 55 will be described. As shown in Fig. 13, the second cover 55 has a first connection portion 551 provided around the spindle 40 and a second connection portion 554 provided above the first connection portion 551. The first connection portion 551 and the second connection portion 554 are formed integrally with a right wall 56 of the second cover 55, and protrude from the right wall 56 to the right.

[0053] 14, the first connecting portion 551 is formed in a generally cylindrical shape centered on the output shaft AX2. The first connecting portion 551 extends in the left-right direction. The inner diameter of the first connecting portion 551 is larger than the outer diameter of the cylindrical portion 332 of the bearing box 33. In addition, the right end 552 of the first connecting portion 551 is located to the right of the left end 333 of the cylindrical portion 332. The first connecting portion 551 covers the radial outside of the cylindrical portion 332.

[0054] Between the cylindrical portion 332 of the bearing box 33 and the first connecting portion 551, a spacer 81 formed of an insulating material is interposed. The spacer 81 includes a cylindrical portion 812 having a hole 813 extending in the left-right direction, and a flange 811 provided at the right end of the cylindrical portion 812 and protruding radially outward. The cylindrical portion 812 has a gap G spaced apart in the circumferential direction, and is formed in a substantially annular shape in a cross-sectional view perpendicular to the output shaft AX2. The gap G extends in the left-right direction. The flange 811 of the spacer 81 is disposed between the flange 331 of the bearing box 33 and the right end 552 of the first connecting portion 551 in the left-right direction. The flange 331 of the spacer 81 appears outside the wall chaser 1 (see FIG. 8 and FIG. 14).

[0055] 13, the inner circumferential surface of the cylindrical portion 812 of the spacer 81 abuts against the outer circumferential surface of the cylindrical portion 332 of the bearing box 33. In addition, the outer circumferential surface of the cylindrical portion 812 abuts against the inner circumferential surface of the first connecting portion 551. In this embodiment, the bearing box 33, the spacer 81, and the first connecting portion 551 are arranged so as to overlap each other in the left-right direction. An imaginary plane P that is perpendicular to the output shaft AX2 and passes through the bearing box 33 and the first connecting portion 551 passes through the spacer 81.

[0056] The first connecting portion 551 is configured to be fastened in the circumferential direction by a screw 559 (see FIG. 7) in a state in which the spacer 81 is disposed radially outside the cylindrical portion 332 of the bearing box 33. Fastening the first connecting portion 551 with the screw 559 reduces the gap G of the cylindrical portion 812 of the spacer 81 in the circumferential direction. Therefore, the spacer 81 can be easily assembled between the bearing box 33 and the first connecting portion 551. In the spacer 81 shown in FIG. 14, the gap G is substantially closed in the circumferential direction.

[0057] 15, the second connecting portion 554 has a hole 555 extending in the left-right direction. A male thread portion 557 into which the bolt shaft 862 can be screwed is provided around the hole 555. A recess 556 is provided at the right end of the second connecting portion 554. The recess 556 is formed so as to be recessed from the right end of the second connecting portion 554 to the left, with the central axis AX4 of the hole 555 as the center.

[0058] The second connecting portion 554 is provided to face the third connecting portion 34 of the gear housing 31 in the left-right direction. A central axis AX4 passing through the center of the through hole 341 of the third connecting portion 34 passes through the center of the hole 555 of the second connecting portion 554. The inner diameter of the through hole 341 is larger than the inner diameter of the hole 555. A recess 342 recessed from the left end 345 to the right is provided around the through hole 341 at the left end 345 of the third connecting portion 34.

[0059] Between the third connecting portion 34 and the second connecting portion 554, a first bush 82 formed of an insulating material is interposed. The first bush 82 is formed in a substantially cylindrical shape having a through hole 821 with an inner diameter larger than the hole 555 of the second connecting portion 554. The first bush 82 has cylindrical protrusions 822 and 823 protruding to the left and right sides. The protrusions 822 and 823 are fitted into the recess 556 provided in the second connecting portion 554 and the recess 342 provided in the third connecting portion 34, respectively. An outer surface 824 of the first bush 82 appears outside the wall chaser 1.

[0060] A second bush 84 made of an insulating material is disposed radially inside the through hole 341 of the third connecting portion 34 and the through hole 821 of the first bush 82. The second bush 84 has a cylindrical portion 842 extending in the left-right direction and a flange 841 protruding radially outward at the right end of the cylindrical portion 842. The flange 841 of the second bush 84 abuts against the right end 343 of the third connecting portion 34. The hole 845 of the cylindrical portion 842 has an inner diameter substantially equal to that of the hole 555 of the second connecting portion 554. The cylindrical portion 842 extends from the right surface 344 (right end 343) of the third connecting portion 34 to the vicinity of the right end 825 of the first bush 82. The flange 841 of the second bush 84 appears outside the wall chaser 1.

[0061] The third connecting portion 34 and the second connecting portion 554 are connected by a metal bolt 86. The bolt 86 includes a head 861 and a bolt shaft 862. A tip portion 863 of the bolt shaft 862 is screwed into the male thread portion 557 of the second connecting portion 554. In addition, the head 87 is pressed against a flange 841 of the second bush 84 via a metal washer 89.

[0062] When connecting the third connecting portion 34 and the second connecting portion 554, first, the first bush 82 is disposed between the third connecting portion 34 and the second connecting portion 554 in the left-right direction, and the tubular portion 842 of the second bush 84 is disposed radially inside the third connecting portion 34 and the first bush 82. Furthermore, the bolt shaft 862 is inserted into the hole 845 of the second bush 84, and the tip portion 863 is screwed into the male thread portion 557 of the second connecting portion 554. This firmly connects the third connecting portion 34 and the second connecting portion 554.

[0063] With the above configuration, the spacer 81 is disposed between the bearing box 33 and the first connecting portion 551, and blocks the current path between the bearing box 33 and the first connecting portion 551. In detail, as shown in Fig. 13 and Fig. 14, the cylindrical portion 812 of the spacer 81 blocks the current path C1 in the direction perpendicular to the output shaft AX2 (radial direction) between the bearing box 33 and the first connecting portion 551. The flange 811 of the spacer 81 blocks the current path C2 in the left-right direction between the bearing box 33 and the first connecting portion 551.

[0064] The second bushing 84 is also disposed between the third connecting portion 34 and the second connecting portion 554, and blocks the current path between the third connecting portion 34 and the second connecting portion 554. In detail, as shown in Fig. 13 and Fig. 15, the tubular portion 842 of the second bushing 84 blocks the current path C4 between the third connecting portion 34 and the second connecting portion 554 via the bolt shaft 862. In addition, the flange 841 of the second bushing 84 blocks the current path C5 between the third connecting portion 34 and the second connecting portion 554 via the head portion 861 and the bolt shaft 862.

[0065] As described above, in the wall chaser 1 of this embodiment, the current paths C1, C2, C3, C4, and C5 from the metal cutting tools 101 and 102 to the second cover 55 via the metal spindle 40 and the multiple metal intervening members 41 including the bolt 86 can be effectively blocked by the spacer 81, the first bush 82, and the second bush 84. Therefore, the current is prevented from reaching the second cover 55. Therefore, the user's fingers are allowed to unintentionally touch the cover body 50.

[0066] Furthermore, the metal gear housing 31 and the metal second cover 55 can be connected by metal bolts 86, which can improve connection strength and impact resistance. In this embodiment, an aluminum die casting alloy is used for the cutting tool 101, cutting tool 102, second cover 55, cylinder portion 654, and gear housing 31. This further improves connection strength and impact resistance.

[0067] In this embodiment, the spacer 81, the first bush 82, and the second bush 84 are made of synthetic resin. Specifically, they are made of polyamide containing glass fiber. The spacer 81, the first bush 82, and the second bush 84 may be made of any insulating material, and may be made of any synthetic resin, for example.

[0068] <Structure of impact dispersion mechanism> The impact dispersion (abatement) mechanism will be described below with reference to FIG. 8 and FIG. 15 to FIG. 17. In the following, among the multiple parts (elements, components) constituting the wall chaser 1, the part located on the right side of the cover body 50 is also referred to as the right part 3R. Furthermore, among the right part 3R, the part located behind the gear housing 31 is also referred to as the rear part 3RB. The right part 3R includes main parts for driving the wall chaser 1, such as the gear mechanism 4 and the motor 371 housed in the main body housing 30. In the wall chaser 1 of this embodiment, a mechanism is adopted that suppresses local concentration of impact on these main parts and the main body housing 30 that houses the main parts when the wall chaser 1 is dropped so that the right part 3R (the right surface of the wall chaser 1) faces substantially vertically downward.

[0069] FIG. 8 shows imaginary planes P1, P2, and P3. The plane P1 is a plane perpendicular to the rotation axis AX1 of the motor shaft 372. The plane P1 is also a plane perpendicular to the front-rear direction. The plane P2 is a plane that includes the rotation axis AX1 and extends in the front-rear direction. The plane P3 is a plane that passes through the rightmost protruding portion of the right part 3R. The plane P3 is a plane parallel to the plane P2. In this embodiment, the first handle 64 is not included in the rightmost protruding portion of the right part 3R. As described above, the first handle 64 is configured to be selectively fixed at the position shown in FIG. 1, a position rotated 90 degrees to the right from the position shown in FIG. 1 (see FIGS. 6, 7, and 9), and a position rotated 90 degrees to the left from the position shown in FIG. 1. This is because when the first handle 64 is fixed as shown in FIGS. 6, 7, and 9, the first handle 64 is disposed to the left of the plane P3. Also, when the wall chaser 1 is used, the first handle 64 can be used such that the first gripping portion 641 extends in the vertical direction, as shown in FIGS.

[0070] The right portion 3R of the wall chaser 1 includes a first protruding portion 70 provided on the gear housing 31 and a second protruding portion 3T provided on the rear portion 3RB. The first protruding portion 70 and the second protruding portion 3T protrude to the right beyond the outer surface 374 of the motor housing 37. The protruding ends (right ends) of the first protruding portion 70 and the second protruding portion 3T are located on a plane P3.

[0071] As shown in FIGS. 8 and 16, the second protrusion 3T includes the outer surface 384 of the controller housing 38 and the right end 262 of the shaft 26.

[0072] 17 and 18, the gear housing main body 32 includes a main body portion 325, a first connection portion 321, a second connection portion 323, and a first protrusion portion 70. The main body portion 325 is a portion of the gear housing main body 32 that houses the interposed member 41 including the gear mechanism 4. The left-right width of the main body portion 325 is smaller than that of the motor housing 37 (see FIG. 8).

[0073] The first connection portion 321 is a portion of the gear housing main body 32 that is connected to the front end portion of the motor housing 37. The first connection portion 321 constitutes the rear end portion of the gear housing main body 32. The first connection portion 321 is a substantially cylindrical wall centered on the rotation axis AX1 and perpendicular to the rotation axis AX1. The second connection portion 323 is a portion of the gear housing main body 32 that is connected to the bearing box 33. As shown in FIG. 18, the second connection portion 323 is connected to the first connection portion 321 at a position inside (right side) of the left end 322L of the first connection portion 321, and extends forward from the first connection portion 321. The connecting portion between the first connection portion 321 and the second connection portion 323 constitutes a corner portion 324 that forms a substantially right angle.

[0074] The first protrusion 70 is formed so as to protrude to the right from the main body 325. As shown in Fig. 18, the right surface 326 of the main body 325 is located inside (left side) of the right end 322R of the first connection portion 321. The first protrusion 70 is formed in a rib shape that protrudes further rightward from the right surface 326. The first protrusion 70 is provided near the first connection portion 321. The vicinity of the first connection portion 321 is also near the motor housing 37 of the gear housing 31 in the front-rear direction.

[0075] As shown in Figs. 17 and 18, the first protrusion 70 includes a first rib 71, a second rib 72, a connecting rib 73, and an inclined rib 74. The first rib 71, the second rib 72, the connecting rib 73, and the inclined rib 74 are all substantially wall-shaped. The first rib 71 extends parallel to the plane P1 (in the left-right direction). When viewed from the right, the first rib 71 is perpendicular to the rotation axis AX1 of the motor shaft 372. The second rib 72 extends parallel to the plane P2 (in the front-rear direction). As shown in Figs. 16 and 17, the second rib 72 is provided forward and above the first rib 71. The connecting rib 73 connects the first rib 71 and the second rib 72, and extends in a direction intersecting the plane P1. As shown in Fig. 8 and Fig. 18, the right end 711 of the first rib 71, the right end 721 of the second rib 72, and the right end 731 of the connecting rib 73 are located on the plane P3. In other words, the distances of the right ends 711, 721, and 731 from the plane P2 are equal. The inclined rib 74 is connected to the front end of the second rib 72. As shown in Fig. 18, the inclined rib 74 is formed so that the protruding height from the right surface 326 decreases toward the front side. The front end 741 of the inclined rib 74 is connected to the right surface 326.

[0076] The first protruding portion 70 further includes an inclined rib 75. The inclined rib 75 is provided below and in front of the first rib 71. The inclined rib 75 extends approximately parallel to the inclined rib 74 described above, and is formed so that the protruding height from the right surface 326 decreases toward the front side. The length of the inclined rib 75 in the front-rear direction is shorter than that of the inclined rib 74. The inclined rib 75 is connected to the first rib 71 by the connecting rib 76. As described above, the first protruding portion 70 is formed by connecting a plurality of ribs 71 to 76.

[0077] The first protrusion 70 is provided on the gear housing 31 so as to cover the periphery of the exhaust hole 301 provided in the gear housing main body 32. As shown in FIG. 17, the exhaust hole 301 is provided forward of the first rib 71 and rearward of the front end 741 of the inclined rib 74. Moreover, most of the exhaust hole 301 is provided between the second rib 72 and the inclined rib 74 and the inclined rib 75 in the up-down direction. The first protrusion 70 partially covers the periphery of the exhaust hole 301 while leaving the front of the exhaust hole 301 open. When the fan 373 rotates, air flows into the main housing 30 from the intake hole 382 provided at the rear end of the rear portion 3RB and is discharged from the exhaust hole 301. This cools the motor 371.

[0078] As shown in Fig. 17, a recess 328 recessed from the right surface 326 toward the left side is formed in front of the inclined rib 75 in the main body 325. As shown in Fig. 8, a shaft lock switch 91 is disposed in the recess 328. When a user rotates the spindle 40 (the blades 101, 102) with his / her fingers while pressing the shaft lock switch 91 against the gear housing 31, and an axis portion (not shown) of the shaft lock switch 91 engages with a hole (not shown) provided in the large bevel gear 413, the spindle 40 becomes unrotatable. This allows the user to rotate the lock nut 47 to remove the blades 101, 102 from the spindle 40 and replace them.

[0079] As described above, the wall chaser 1 of this embodiment has the first protrusion 70 provided on the gear housing 31 and the second protrusion 3T provided on the rear portion 3RB. Therefore, even if the wall chaser 1 falls with its right side facing substantially vertically downward, the first protrusion 70 and the second protrusion 3T hit the ground or the like, so that the impact at the time of the fall can be dispersed. Therefore, the wall chaser 1 can be protected from the impact at the time of the fall.

[0080] In addition, since the first protrusion 70 is formed by connecting a plurality of ribs 71 to 76, the contact area when the device is dropped can be increased, and therefore the impact when the device is dropped can be dispersed more effectively.

[0081] Moreover, the first rib 71 extends parallel to the plane P1 and is perpendicular to the rotation axis AX1 of the motor shaft 372 when viewed from the right. Therefore, the impact applied to the motor shaft 372 when dropped can be effectively dispersed.

[0082] In addition, the second rib 72 extends parallel to the plane P2, that is, in the processing direction of the wall chaser 1. Therefore, the user can easily recognize whether the wall chaser 1 is inclined with respect to the horizontal direction by visually checking the second rib 72. Therefore, the processing accuracy can be improved.

[0083] In addition, the first rib 71 and the second rib 72 are connected by a connecting rib 73 that intersects the plane P1, so that deformation of the first protrusion 70 due to the impact of being dropped can be suppressed compared to a configuration in which the first rib 71 and the second rib 72 are connected at right angles.

[0084] Further, an inclined rib 74 is provided at the front end 741 of the second rib 72, the height of which protrudes to the right decreases with increasing distance from the second rib 72. Therefore, even if stress is applied in a direction intersecting the planes P2 and P3 when the wall chaser 1 is dropped, the inclined rib 74 can relieve the stress.

[0085] Furthermore, the first protrusion 70 is provided around the exhaust hole 301 that exhausts the cooling air of the motor 371. This allows for effective use of the space in the gear housing 31. Also, the first protrusion 70 opens the direction in which air is exhausted from the exhaust hole 301 and partially covers the periphery of the exhaust hole 301, so that the cooling efficiency of the motor 371 can be maintained.

[0086] In addition, the connection portion between the first connection portion 321 and the second connection portion 323 in the gear housing 31 constitutes the corner portions 324, 324. The corner portion 324 forms a substantially right angle, so stress tends to concentrate relatively easily. However, in the wall chaser 1 of this embodiment, the first protrusion portion 70 and the second protrusion portion 3T effectively disperse the impact when dropped, so that the occurrence of cracks in the gear housing 31 can be effectively suppressed with the corner portion 324 as the base point. In addition, since the first connection portion 321 and the second connection portion 323 are connected to form a right angle, the wall chaser 1 of this embodiment has the advantage that other components can be easily arranged on the left side of the gear housing main body 32.

[0087] Since the wall chaser 1 includes the cutting tools 101 and 102, the weight of the tool tip attached to the spindle 40 is relatively large, and the impact when dropped is likely to be large. However, according to the wall chaser 1 of this embodiment, the impact when dropped can be effectively dispersed.

[0088] Furthermore, the wall chaser 1 of this embodiment is provided with a battery mounting section 39 to which the battery 200 is detachably mounted. Due to the weight of the battery 200, the impact when dropped is likely to be greater. However, according to the wall chaser 1 of this embodiment, the impact when dropped can be dispersed more effectively.

[0089] <Cover section configuration> The configuration of the cover part 5 including the cover main body 50 and the base part 2 will be described in detail below. In the wall chaser 1, when the cutting tools 101, 102 are attached to the spindle 40 or removed from the spindle 40, the cover part 5 is opened to expose the cutting tools 101, 102. The cover part 5 of this embodiment is configured so that the user can easily open the cover part 5 by rotating the first cover 51 in the first direction R around the shaft 26.

[0090] As shown in FIG. 19, the first cylindrical portion 54, the third cylindrical portion 25, and the second cylindrical portion 58 are provided at the rear end of the first cover 51, the rear end of the base portion 2, and the rear end of the second cover 55, respectively. The first cylindrical portion 54, the third cylindrical portion 25, and the second cylindrical portion 58 are provided on the base 21. The first cylindrical portion 54, the third cylindrical portion 25, and the second cylindrical portion 58 are formed in a substantially cylindrical shape having holes 549, 259, and 589 (see FIG. 12) penetrating in the left-right direction, respectively. The shaft 26 is inserted into the holes 549, 259, and 589. The first cylindrical portion 54, the third cylindrical portion 25, and the second cylindrical portion 58 are arranged rotatably around the shaft 26 in this order from left to right.

[0091] As shown in FIG. 20, a first contact portion 541 and a first recess 542 are provided on the right part of the first cylindrical portion 54. The first contact portion 541 is a block-shaped portion protruding to the right side of the first cylindrical portion 54. The first contact portion 541 can also be called a convex portion of the first cylindrical portion 54. The right end of the first contact portion 541 is perpendicular to the rotation axis AX3. The first recess 542 is provided on the second direction R2 side of the first contact portion 541 in the circumferential direction centered on the rotation axis AX3, and is a portion recessed to the left side of the first contact portion 541. In addition, a cylindrical wall 543 that covers a part of the torsion spring 62 is provided on the first direction R1 side of the first contact portion 541. As shown in FIG. 19, the left end of the first cylindrical portion 54 forms an abutment surface 547 perpendicular to the rotation axis AX3. The contact surface 547 contacts a retaining ring 277 provided around the shaft 26. The retaining ring 277 restricts the first cylindrical portion 54 from moving to the left.

[0092] As shown in FIG. 21 and FIG. 22, the left part of the third cylindrical part 25 is provided with a second contact part 252, a third contact part 253, and an inclined part 254. The second contact part 252 is the part that protrudes most to the left in the third cylindrical part 25. The second contact part 252 can also be said to be a convex part in the third cylindrical part 25. The left end of the second contact part 252 is perpendicular to the rotation axis AX3. As shown in FIG. 23, the third contact part 253 is provided on the first direction R1 side with respect to the second contact part 252. Also, as shown in FIG. 22, the third contact part 253 is recessed to the right side with respect to the second contact part 252. The third contact part 253 is also called a second recess. The inclined part 254 is a part that connects the second contact part 252 and the third contact part 253 in the circumferential direction. The inclined portion 254 is formed such that the amount of protrusion toward the first cover 51 side (left side) gradually decreases toward the first direction R1. In this manner, the left portion of the third cylindrical portion 25 has a stepped shape. As shown in Fig. 19, the right end of the third cylindrical portion 25 forms an abutment surface 255 perpendicular to the rotation axis AX3.

[0093] 19, the second cylindrical portion 58 has an abutment surface 581 (first abutment surface) provided at the left end and an abutment surface 582 provided at the right end. The abutment surfaces 581, 582 are perpendicular to the rotation axis AX3. The abutment surface 581 abuts against the abutment surface 255 (second abutment surface) of the third cylindrical portion 25. The abutment surface 582 abuts against a retaining ring 278 provided around the shaft 26. The retaining ring 278 restricts the second cylindrical portion 58 from moving to the right.

[0094] When the wall chaser 1 is normally in a state in which machining work can be performed, the projection 27 of the auxiliary cover 22 is engaged with the through hole 57 of the depth guide 63 (see, for example, FIG. 3). Furthermore, normally, the first cover 51 and the second cover 55 are connected in the left-right direction by a connecting portion 59, and rotate integrally around the rotation axis AX3. In other words, the first cover 51 does not rotate independently.

[0095] 24 and 25 are partial schematic diagrams of the cover part 5 around the shaft 26 viewed from above. (a) shows the cover part 5 in a normal state, and (b) shows a state in which the first cover 51 and the second cover 55 are released from connection and the first cover 51 is rotated independently. Normally, the first abutment part 541 of the first cylindrical part 54 and the second abutment part 252 of the third cylindrical part 25 are in contact with each other in the left-right direction (see Figs. 19 and 25). Therefore, the movement of the third cylindrical part 25 to the left is restricted by the first abutment part 541. As described above, the retaining rings 277 and 278 restrict the first cylindrical part 54, the second cylindrical part 58, and the third cylindrical part 25 as a whole from moving in the left-right direction. Therefore, in the wall chaser 1 of this embodiment, the cover part 5 is restricted from moving in the left-right direction on the shaft 26 during processing work.

[0096] When the connection by the connecting portion 59 is released, the first cover 51 becomes independently rotatable around the shaft 26. Note that, since the protrusion 27 of the base portion 2 is engaged with the through hole 57 of the second cover 55, the base portion 2 cannot be independently rotated.

[0097] As shown in FIG. 24 and FIG. 25, when the first cover 51 is rotated in the first direction R1, the first contact portion 541 of the first cylindrical portion 54 moves toward the first direction R1. The contact between the first contact portion 541 and the second contact portion 252 is maintained until the first contact portion 541 moves to a position different from the second contact portion 252 in the circumferential direction. The range of the rotation angle of the first cover 51 in which the contact between the first contact portion 541 and the second contact portion 252 is maintained is also called the first angle range. The first angle range is, for example, a range of the rotation angle of the first cover 51 until the first contact portion 541 moves to a position different from the second contact portion 252 in the circumferential direction when the first cover 51 is rotated in the first direction R1 from the reference position. The reference position is, for example, a predetermined position of the first cover 51 at the top dead center (for example, the lower edge 511). The reference position may be a predetermined position of the first cover 51 at the bottom dead center. When the rotation angle of the first cover 51 is within a first angle range, the movement of the third cylindrical portion 25 to the left is restricted by the first contact portion 541.

[0098] When the first cover 51 is further rotated in the first direction R1 beyond the first angle range, the first recess 542 is positioned to the left of the second contact portion 252. That is, a space is generated to the left of the second contact portion 252. Therefore, the second contact portion 252 can move toward the first recess 542 as shown by the arrow AR in Fig. 25(b). In other words, the third cylindrical portion 25 (base portion 2) can move to the left.

[0099] Further, the inclined portion 254 and the third abutment portion 253 are located on the first direction R1 side of the second abutment portion 252. Therefore, as the first cover 51 is rotated in the first direction R1 beyond the first angle range, the inclined portion 254 is located on the right side of the first abutment portion 541, and then the third abutment portion 253 is located. In this embodiment, the difference in the amount of protrusion to the left between the second abutment portion 252 and the third abutment portion 253 is smaller than the depth (width in the left-right direction) of the first recess 542. Therefore, when the third cylindrical portion 25 (base portion 2) is moved to the left, the second abutment portion 252 is moved into the first recess 542, and the third abutment portion 253 abuts against the first abutment portion 541. In other words, when the rotation range of the first cover 51 exceeds the first angle range, the base unit 2 can move to the left until the third contact portion 253 contacts the first contact portion 541. Note that the rotation angle of the first cover 51 with respect to the reference position that exceeds the first angle range is also referred to as the second angle range. The second angle range is also the range of rotation angles of the first cover 51 at which the engagement between the base unit 2 and the second cover 55 in the left-right direction is released.

[0100] In this embodiment, the left-right distance between the first contact portion 541 and the third contact portion 253 is adjusted to a distance that allows the projection 27 of the base portion 2 to be removed from the through hole 57 of the second cover 55 when the base portion 2 is moved to the left. Therefore, when the first cover 51 is rotated beyond the first angle range, the base portion 2 is moved to the left, and the engagement between the base portion 2 and the second cover 55 is released. As a result, the base portion 2 becomes independently rotatable around the shaft 26. In this state, when the user moves the base portion 2 in the second direction R2, the blades 101 and 102 are completely exposed to the left side (see FIG. 26). As described above, in the wall chaser 1 of this embodiment, the cover portion 5 can be easily opened by rotating the first cover 51 in the first direction R1 beyond the first angle range, and the blades 101 and 102 can be attached to and detached from the left portion 401.

[0101] As described above, in the wall chaser 1 of this embodiment, by rotating the first cover 51 in the first direction R1, the second cover 55 can be moved to the first cover 51 side (left side) and the base part 2 can be rotated in the second direction R2. Therefore, the cover part 5 can be easily opened. Therefore, the wall chaser 1 of this embodiment has the advantage that the cutting tools 101, 102 can be easily replaced.

[0102] Moreover, the first abutment portion 541 of the first cover 51 and the second abutment portion 252 of the second cover 55 are normally in abutment with each other, restricting the movement of the second cover 55 to the left. Therefore, the cover portion 5 is prevented from moving in the left-right direction on the shaft 26 during processing. This improves the processing accuracy of the wall chaser 1.

[0103] Furthermore, the through hole 57 of the depth guide 63 can be used as an engagement portion for engaging the base portion 2 with the second cover 55. Therefore, the wall chaser 1 can be configured more simply than in a configuration in which the engagement portion is separately provided.

[0104] In addition, the shaft 26 on which the first cylindrical portion 54, the second cylindrical portion 58, and the third cylindrical portion 25 of the cover portion 5 are provided also functions as a shaft for the wheels 271 and 272 for moving the wall chaser 1 in the processing direction. Therefore, the configuration of the wall chaser 1 can be simplified.

[0105] The correspondence between each component of the above embodiment and each component of the technology of the present disclosure is shown below. However, each component of the embodiment is merely an example and does not limit each component of the technology of the present disclosure. The wall chaser 1 is an example of a "portable processing machine". The output shaft AX2 is an example of an "output shaft". The shaft AX3 is an example of a "first shaft". The cutting tools 101 and 102 are examples of a "tip tool" and a "plurality of cutting tools". The spindle 40 is an example of a "spindle". The left part 401 is an example of a "tool mounting part". The base part 2 is an example of a "base part". The cover part 5 is an example of a "cover part". The first cover 51 and the second cover 55 are examples of a "first cover" and a "second cover", respectively. The first direction R1 and the second direction R2 are examples of a "first direction" and a "second direction", respectively. The left side and the right side are examples of a "first side" and a "second side", respectively. The first cylindrical part 54, the second cylindrical part 58, and the third cylindrical part 25 are examples of a "first cylindrical part", a "second cylindrical part", and a "third cylindrical part", respectively. The contact surface 23 and the through hole 24 are examples of the "contact surface" and the "through hole", respectively. The first contact portion 541 and the second contact portion 252 are examples of the "first contact portion" and the "second contact portion", respectively. The first recess 542 is an example of the "first recess". The third contact portion 253 and the inclined portion 254 are an example of the "third contact portion". The base 21 and the auxiliary cover 22 are examples of the "base main body" and the "auxiliary cover", respectively. The protrusion 27 is an example of the "first engagement portion" and the "protrusion". The through hole 57 is an example of the "second engagement portion" and the "guide groove". The depth guide 63 and the stopper 633 are examples of the "depth guide" and the "stopper", respectively. The torsion spring 62 is an example of the "biasing member". The wheel 271 and the wheel 272 are examples of the "first wheel" and the "second wheel", respectively. The contact surface 581 and the contact surface 255 are examples of a “first contact surface” and a “second contact surface,” respectively. The retaining rings 277 and 278 are examples of a “first restriction portion” and a “second restriction portion,” respectively.

[0106] It should be noted that the above embodiment is merely an example, and the form processing machine according to the present disclosure is not limited to the illustrated wall chaser 1. For example, the following modifications can be made. In addition, at least one of these modifications can be adopted in combination with the wall chaser 1 illustrated in the embodiment and at least one of the features described in each claim.

[0107] The insulation mechanism of the wall chaser 1 can be modified as follows. For example, as long as the plurality of intervening members 41 includes at least one insulating member that insulates the spindle 40 from the second cover 55, the configuration of the plurality of intervening members 41 and the at least one insulating member can be appropriately changed according to the configuration of the second cover 55 and the gear housing 31 and the configuration of the portable processing machine to which the insulation mechanism is applied. For example, in a configuration in which the wall chaser 1 does not include the second connecting portion 554 and the third connecting portion 34, if at least the spacer 81 is disposed between the gear housing 31 and the second cover 55, the current paths C1 and C2 from the spindle 40 to the second cover 55 via the intervening member 41 can be blocked. Therefore, the same effect as that of the above-mentioned embodiment is achieved. In addition, when the second connecting portion 554 and the third connecting portion 34 are connected by something other than the metal bolt 86, the second bush 84 may be omitted.

[0108] Further, the second cover 55 may have the first connecting portion 551 and the second connecting portion 554 with the gear housing 31 made of metal, and the other portions made of synthetic resin. Even with this configuration, it is possible to prevent a current from reaching the metal portions of the second cover 55, and therefore the same effect as the above-described embodiment can be achieved.

[0109] Furthermore, when the gear housing 31 and the second cover 55 are connected with a metal bolt 86, one of the gear housing 31 and the second cover 55 may be provided with a threaded portion into which the bolt 86 is threaded, and the other may be provided with a hole (first hole) into which the bolt shaft 862 can be disposed. For example, the gear housing 31 may be provided with a male thread portion 557, and the second connecting portion 554 may be provided with a hole (first hole) into which the tubular portion 842 of the second bush 84 can be disposed.

[0110] The impact dispersion mechanism may be modified as follows. For example, the configuration of the first protrusion 70 may be appropriately changed according to the configuration of the portable processing machine to which the impact dispersion mechanism is applied. For example, the first rib 71 and the second rib 72 may not be connected. Alternatively, the first protrusion 70 may not include either the first rib 71 or the second rib 72. Similarly, the configuration of the second protrusion 3T may be appropriately changed according to the configuration of the portable processing machine to which the impact dispersion mechanism is applied. For example, the second protrusion 3T may be a wall portion (rib) formed so as to protrude to the right side from the controller housing 38.

[0111] The configuration of the cover part 5 can be modified as follows. For example, the configuration of the cover part 5 can be appropriately modified as long as the movement of the base part 2 to the left (toward the first cover 51) is restricted when the rotation angle of the first cover 51 in the first direction R1 is within a first angle range, and the movement of the base part 2 to the left is permitted when the rotation angle of the first cover 51 in the first direction R1 exceeds the first angle range. For example, the first contact part 541 of the first cover 51 and the second contact part 252 of the base part 2 may be provided in a part other than the first cylindrical part 54, the first cylindrical part 54 of the first cover 51, and the third cylindrical part 25 of the base part 2, respectively.

[0112] Furthermore, the configuration for engaging the base portion 2 and the second cover 55 in the left-right direction may be modified as appropriate, so long as the engagement occurs when the movement of the base portion 2 to the left (toward the first cover 51) is restricted, and the engagement is released in response to the movement of the base portion 2 to the left. For example, the second cover 55 may have a groove portion different from the through hole 57 of the depth guide 63, and the protrusion 27 may be engaged with the groove portion. Alternatively, the protrusion 27 may be engaged with any portion fixed to the base portion 2. Alternatively, the second cover 55 may have a protrusion, and the base portion 2 may have a groove portion with which the protrusion is engaged.

[0113] Furthermore, the configurations of the first cylindrical portion 54, the second cylindrical portion 58, and the third cylindrical portion 25 may be appropriately changed as long as they are provided rotatably around the shaft 26. For example, at least one of the first cylindrical portion 54, the second cylindrical portion 58, and the third cylindrical portion 25 may be formed in a cylindrical shape with a portion spaced apart in the circumferential direction.

[0114] In addition, the configurations of the first abutment portion 541, the second abutment portion 252, the third abutment portion 253, and the first recess 542 may be changed as appropriate, so long as the first abutment portion 541 and the second abutment portion 252 abut when the rotation angle of the first cover 51 is within a first angle range, and the abutment is released when the rotation angle exceeds the first angle range.

[0115] Furthermore, the first cover 51 and the second cover 55 may be modified as appropriate so long as the first cover 51 is configured to be rotatable in the first direction R1. For example, the first cover 51 and the second cover 55 do not need to be constantly connected to each other by the connecting portion 59. Alternatively, when the first cover 51 and the second cover 55 are connected to each other, the configuration of the connecting portion 59 may be modified as appropriate.

[0116] In the above embodiment, the cutting tools 101 and 102 for forming two rows of grooves are used as the end tool of the wall chaser 1. Instead of this, three or more cutting tools may be used. Alternatively, a single cutting tool having two or more rows of cutting parts may be used.

[0117] Furthermore, the above-described embodiment is not limited to the wall chaser 1, but can be applied to any portable processing machine having a cover portion 5 (for example, a plunge circular saw, a groove cutting cutter, etc.).

[0118] In view of the spirit of the present invention and the above-mentioned embodiments, the following aspects are constructed. At least one of the following aspects may be adopted in combination with at least one of the features of the embodiment and its variants, or the features described in each claim. [Explanation of symbols]

[0119] 1: wall chaser, 2: base portion, 3: main body portion, 3R: right portion, 3RB: rear portion, 3T: second protrusion portion, 4: gear mechanism, 5: cover portion, 8: arrow, 9: arrow, 21: base, 22: auxiliary cover, 23: abutment surface, 24: through hole, 25: third cylindrical portion, 26: shaft, 27: protrusion, 29: upper edge portion, 30: main body housing, 31: gear housing, 32: gear housing main body, 33: bearing box, 34: third connecting portion, 37: motor housing, 38: controller housing, 39: battery mounting portion, 40: spindle, 41: interposition member, 46: Inner flange, 47: lock nut, 48: spacer, 50: cover body, 51: first cover, 52: first cover, 54: first cylindrical portion, 55: second cover, 56: right wall, 57: through hole, 58: second cylindrical portion, 59: connecting portion, 62: torsion spring, 63: depth guide, 64: first handle, 65: second handle, 70: first protrusion, 71: first rib, 72: second rib, 73: connecting rib, 74: inclined rib, 75: inclined rib, 76: connecting rib, 81: spacer, 82: first bush, 84: second bush, 86: bolt, 87: head, 89: washer , 91: shaft lock switch, 101: cutting tool, 102: cutting tool, 200: battery, 252: second contact portion, 253: third contact portion, 254: inclined portion, 255: contact surface, 259: hole, 262: right end portion, 271: wheel, 272: wheel, 273: main body portion, 274: covering portion, 277: retaining ring, 278: retaining ring, 301: exhaust hole, 321: first connection portion, 322L: left end, 322R: right end, 323: second connection portion, 324: corner portion, 325: main body portion, 326: right surface, 328: recess, 331: flange, 332: cylinder portion, 333: left end, 335: screw, 341: through hole, 34 2: recess, 343: right end, 344: right surface, 345: left end, 371: motor, 372: motor shaft, 373: fan, 374: outer surface, 381: controller, 382: air intake, 384: outer surface, 391: power supply terminal, 401: left part, 402: right part, 411: first bearing, 412: small bevel gear, 413: large bevel gear, 414: bearing retainer, 415: second bearing, 416: washer, 481: sleeve, 511: lower edge, 541: first contact part, 542: first recess, 543: cylinder wall, 547: contact surface, 549: hole, 551: first connecting part,552: right end, 554: second connecting portion, 555: hole, 556: recess, 557: male thread portion, 559: screw, 581: contact surface, 582: contact surface, 589: hole, 633: stopper, 634: operation knob, 635: nut, 641: first grip portion, 642: trigger, 651: second grip portion, 652: base portion, 653: bridge portion, 654: cylinder portion, 655: operation knob, 711: right end, 721: right end, 731: right end, 741: front end, 811: flange, 812: cylinder portion, 8 13: hole, 821: through hole, 822: convex portion, 823: convex portion, 824: outer surface, 825: right end, 841: flange, 842: cylindrical portion, 845: hole, 861: head portion, 862: bolt shaft, 863: tip portion, AR: arrow, AX1: rotating shaft, AX2: output shaft, AX3: shaft, AX4: central shaft, C1: path, C2: path, C3: path, C4: path, C5: path, G: gap, P: virtual plane, P1: plane, P2: plane, P3: plane, R1: first direction, R2: second direction,

Claims

1. A portable processing machine, a spindle rotatable around an output shaft that defines the left-right direction of the portable processing machine, the spindle having a tool mounting portion configured to removably mount a disk-shaped tool; a shaft having a first axis extending parallel to the output shaft; A cover portion configured to cover at least a part of the tool bit attached to the tool attachment portion, a first cover including a first cylindrical portion provided around the shaft and covering a first side in the left-right direction of the tool bit attached to the tool attachment portion; a second cover including a second cylindrical portion provided around the shaft and covering a second side of the tool bit attached to the tool attachment portion opposite the first side in the left-right direction; a cover portion including a third cylindrical portion disposed around the shaft between the first cylindrical portion and the second cylindrical portion, and a base portion having an abutment surface for abutting against a workpiece and a through-hole provided in the abutment surface through which the tool bit can be exposed, and engaged with the second cover in the left-right direction; When a direction perpendicular to the contact surface is defined as a vertical direction of the portable processing machine, the first cover and the second cover are disposed above the contact surface, the first cover is configured to be rotatable about the first axis in a first direction away from the contact surface and in a second direction opposite to the first direction, The base portion is The engagement with the second cover is released by being moved to the first side in the left-right direction, The cover portion is When a rotation angle of the first cover in the first direction is within a first angle range with respect to a reference position, movement of the base portion toward the first side is restricted, When the rotation angle of the first cover in the first direction exceeds the first angle range, the base portion is allowed to move toward the first side, and the engagement with the second cover in the left-right direction is released. Portable processing machine.

2. The portable processing machine according to claim 1, The portable processing machine is configured so that the base portion can rotate in the second direction when the engagement with the second cover in the left-right direction is released.

3. The portable processing machine according to claim 1, the first cylindrical portion includes a first abutment portion provided on the second side in the left-right direction, the third cylindrical portion includes a second abutment portion provided on the first side in the left-right direction, A portable processing machine configured such that when the rotation angle of the first cover in the first direction is within the first angle range, the first abutment portion abuts against the second abutment portion in the left-right direction, thereby restricting movement of the base portion toward the first side.

4. The portable processing machine according to claim 3, A portable processing machine configured such that when the rotation angle of the first cover in the first direction exceeds the first angle range, the first abutment portion is moved to a position different from the second abutment portion in a circumferential direction centered on the first axis, thereby allowing the base portion to move toward the first side.

5. The portable processing machine according to claim 4, the first cylindrical portion includes a first recess provided on the second direction side relative to the first abutment portion, When the rotation angle of the first cover in the first direction exceeds the first angle range, the first recess is aligned with the second abutment portion in the left-right direction, and the base portion is allowed to move toward the first side.

6. The portable processing machine according to claim 4, the third cylindrical portion further includes a third abutment portion that is provided on the first direction side relative to the second abutment portion and is recessed toward the second side relative to the second abutment portion, The third contact portion is When a rotation angle of the first cover in the first direction exceeds the first angle range, the third contact portion is aligned with the first contact portion in the left-right direction, When the base portion is moved to the first side, the base portion abuts against the first abutment portion. Portable processing machine.

7. The portable processing machine according to claim 1, The base portion is a base body including the abutment surface and the through hole; an auxiliary cover connected to the base body and disposed above the base body and inside the first cover and the second cover in the left-right direction; the auxiliary cover has a first engaging portion that engages with the second cover in the left-right direction, the second cover has a second engaging portion that engages with the auxiliary cover in the left-right direction, The first engagement portion is the first cover is engaged with the second engaging portion at least when the rotation angle of the first cover is within the first angle range; a portable processing machine, wherein the engagement with the second engagement portion is released in response to the first cover being rotated beyond the first angle range and the base portion being moved toward the first side;

8. The portable processing machine according to claim 7, the first cover and the second cover are rotatable together in the first direction and the second direction, and are configured to cause the tool bit to protrude downward from the through hole by being rotated in the first direction, the cover portion is a depth guide for regulating a downward protrusion depth of the tool bit relative to the contact surface, an arc-shaped guide groove provided in the second cover; a depth guide that can be fixed at a predetermined position within the guide groove and includes a stopper configured to restrict rotation of the second cover in the second direction; the first engagement portion is a protrusion that protrudes from the auxiliary cover toward the second side, The second engagement portion is the guide groove.

9. The portable processing machine according to claim 8, a biasing member provided around the shaft and biasing the second cover in the first direction; The protrusion restricts movement of the second cover in the first direction.

10. The portable processing machine according to claim 1, further comprising: a first wheel provided on the first side of the first cylindrical portion around the shaft; a second wheel provided around the shaft on the second side of the third cylindrical portion.

11. The portable processing machine according to claim 1, the second cylindrical portion includes a first abutment surface provided on the first side, the third cylindrical portion includes a second abutment surface provided on the second side and abutting against the first abutment surface, The portable processing machine further includes: a first restricting portion provided around the shaft and restricting movement of the first cylindrical portion toward the first side; a second restricting portion that restricts movement of the second cylindrical portion toward the second side.

12. The portable processing machine according to claim 1, the portable processing machine is a wall chaser, The portable processing machine includes a plurality of cutting tools attached to the tool attachment portion.

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