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 Art]

[0002] As a type of portable processing machine, a wall chaser for grooving a workpiece such as a wall, a floor, or a ceiling is known. For example, the wall chaser described in Patent Document 1 includes a base portion configured to be abutted against a workpiece, and a main body portion arranged on one side of the base portion. The main body portion includes a housing that accommodates a motor and a gear mechanism, and a cover body that covers a cutting tool. With the base portion abutted against the workpiece and the motor rotated, when a user rotates (swings) the main body portion in a direction approaching the base portion, 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 orthogonal 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 Specification [Patent Document 2] US Patent Application Publication No. 2006 / 0164449 Specification [Summary of the Invention] [Problems to be Solved by the Invention]

[0004] However, the aforementioned wall chaser still has room for improvement. For example, with this type of tool, the cutting tool is replaced by opening the cover, which includes the base and the cover body. This can sometimes result in a complex cover structure or require considerable effort to open. Therefore, not only for wall chasers, but for any portable machining tool where the tip tool is partially covered by a cover, there is a need for technology that allows the cover to be opened easily. [Means for solving the problem]

[0005] A portable machining center is provided according to a first aspect of the present disclosure. The portable machining center comprises a spindle, a shaft, and a cover portion. The spindle is configured to be rotatable about an output axis that defines the left-right direction of the portable machining center. The spindle has a tool mounting portion configured to detachably mount a disc-shaped tip tool. The shaft has a first axis extending parallel to the output axis. The cover portion is configured to at least partially cover the tip tool mounted on the tool mounting portion. The cover portion comprises a first cover, a second cover, and a base portion. The first cover has 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 tip tool mounted on the tool mounting portion. The second cover has a second cylindrical portion provided around the shaft. The second cover is configured to cover a second side in the left-right direction opposite to the first side with respect to the tip tool mounted on the tool mounting portion. The base portion includes a third cylindrical portion positioned around the shaft between the first cylindrical portion and the second cylindrical portion. The base portion has a contact surface for contacting a workpiece and a through hole provided in the contact surface through which the tip tool can be exposed. The base portion is configured to engage with the second cover in the left-right direction. When the direction perpendicular to the contact surface is defined as the up-down direction of the portable workpiece, the first cover and the second cover are positioned above the contact surface. The first cover is configured to be rotatable around the first axis in a first direction away from the contact surface and a second direction opposite to the first direction. The base portion is configured to be released from engagement with the second cover by moving to the first side in the left-right direction. The cover portion is configured such that the movement of the base portion to the first side is restricted when the rotation angle of the first cover in the first direction is within a first angular range with respect to a reference position. The cover portion is configured such that, if the rotation angle of the first cover in the first direction exceeds the first angular 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.

[0006] In this embodiment, the engagement between the second cover and the base can be released by rotating (rotating, swinging) the first cover beyond a first angular range in a first direction. Therefore, the cover can be easily opened. [Brief explanation of the drawing]

[0007] [Figure 1] This is a perspective view showing a wall chaser as one embodiment, illustrating the state where the main body is at its top dead center. [Figure 2] This is a left side view of the Wall Chaser, showing the main body in the top dead center position. [Figure 3] This is a right-side view of the Wall Chaser, showing the main body in the top dead center position. [Figure 4] This is a rear view of the wall chaser, showing the main body at its top dead center. [Figure 5] This is a perspective view of a wall chaser with a battery installed, showing the main unit at its bottom dead center. [Figure 6] This is a left side view of the Wall Chaser, showing the main body in the bottom dead center position. [Figure 7] This is a right-side view of the Wall Chaser, showing the main body in the bottom dead center position. [Figure 8] This is a partial bottom view of the wall chaser. [Figure 9] This is a top view of the Wall Chaser. [Figure 10] Figure 9 shows a cross-sectional view along line XX. [Figure 11] Figure 3 is a cross-sectional view along the line XI-XI. [Figure 12] Figure 9 shows a cross-sectional view near the shaft along the line XII-XII. [Figure 13] Figure 9 is a cross-sectional view along line XIII-XIII, illustrating the current path from the cutting tool to the second cover. [Figure 14]It is a partially enlarged view of FIG. 13, showing the periphery of the bearing box and the first connecting portion. [Figure 15] It is a partially enlarged view of FIG. 13, showing the periphery of the second connecting portion and the third connecting portion. [Figure 16] It is a view mainly showing the right portion of the wall chaser, for explaining the first protruding portion and the second protruding portion. [Figure 17] It is a perspective view of a gear housing main body. [Figure 18] It is another view showing the gear housing main body. [Figure 19] It is a view showing a shaft and each cylindrical portion provided around the shaft. [Figure 20] It is a perspective view of a left cover. [Figure 21] It is a left side view of a base portion. [Figure 22] It is a view of the periphery of the third cylindrical portion as seen from the rear. [Figure 23] It is a view of the periphery of the third cylindrical portion as seen from the left. [Figure 24] It is a partial schematic view of the periphery of the shaft in a cover portion as seen from the left, for explaining (a) a state before the first cover is rotated, and (b) a state where the first cover is rotated in the first direction beyond the first angular range. [Figure 25] It is a partial schematic view of the periphery of the shaft in a cover portion as seen from above, for explaining (a) a state before the first cover is rotated, and (b) a state where the first cover is rotated in the first direction beyond the first angular range. [Figure 26] It is a left side view of a cover portion, showing a state where the first cover is rotated in the first direction beyond the first angular range, and the base portion is rotated in the second direction. [Figure 27] It is a right side view of a cover portion, showing a state where the first cover is rotated in the first direction beyond the first angular range, and the base portion is rotated in the second direction. MODE FOR CARRYING OUT THE INVENTION

[0008] In one non-limiting embodiment of the present disclosure, the base portion may be configured to be rotatable in the second direction when it is disengaged from the second cover in the left-right direction. According to this embodiment, when the engagement with the second cover is released, the base can be rotated in the second direction, thereby exposing the tip tool to the second side. This makes it easier to replace the tip tool.

[0009] In addition to or in lieu of the above embodiments, 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 the rotation angle of the first cover in the first direction is within the first angular range, the first contact portion may be configured to contact the second contact portion in the left-right direction, thereby restricting the movement of the base portion toward the first side. According to this embodiment, by providing a first contact portion on the first cover and a second contact portion on the base portion, the movement of the base portion in the left-right direction can be restricted.

[0010] In addition to or instead of the above embodiment, if the rotation angle of the first cover in the first direction exceeds the first angular range, the first contact portion may be moved to a different position from the second contact portion in the circumferential direction about the first axis, thereby allowing the base portion to move toward the first side. According to this embodiment, the contact between the first contact portion and the second contact portion of the base portion is released in conjunction with the rotation of the first cover in the first direction, thus allowing the base portion to move in the left-right direction.

[0011] In addition to or in lieu of the above embodiments, the first cylindrical portion may include a first recess provided on the second direction side with respect to the first contact portion. When the rotation angle of the first cover in the first direction exceeds the first angular range, the first recess may be configured to align with the second contact portion in the left-right direction. In conjunction with the alignment of the first recess and the second contact portion in the left-right direction, the base portion may be configured to allow movement toward the first side. According to this embodiment, since the first recess is provided on the second direction side of the first contact portion, if the rotation angle of the first cover exceeds the first angular range, the second contact portion can move toward the first recess (towards the first side). Therefore, movement of the base portion in the left-right direction is permitted in conjunction with the rotation of the first cover.

[0012] In addition to or in lieu of the above embodiments, the third cylindrical portion may further include a third contact portion provided on the first direction side with respect to the second contact portion and recessed toward the second side with respect to the second contact portion. The third contact portion may be configured to be aligned with the first contact portion in the left-right direction when the rotation angle of the first cover in the first direction exceeds the first angular range. The third contact portion may be configured to come into contact with the first contact portion when the base portion is moved toward the first side. According to this embodiment, if the rotation angle of the first cover exceeds the first angular 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 the above embodiments, or in place of the above embodiments, the base portion may include a base body including the contact surface and the through hole, and an auxiliary cover. The auxiliary cover may be connected to the base body and positioned above the base body and inside the first cover and the second cover in the left-right direction. The auxiliary cover may have a first engaging portion that engages with the second cover in the left-right direction. The second cover may have a second engaging portion that engages with the auxiliary cover in the left-right direction. The first engaging portion may be engaged with the second engaging portion at least when the rotation angle of the first cover is within the first angular range, and the engagement with the second engaging portion may be released as the first cover is rotated beyond the first angular range and the base portion moves toward the first side. According to this embodiment, the first engaging portion and the second engaging portion can engage the base portion and the second cover in the left-right direction.

[0014] In addition to or instead of the above embodiments, the first cover and the second cover may be rotatable integrally in the first and second directions, and may be configured such that rotation in the first direction causes the tip tool to protrude downward from the through hole. The cover portion may be provided with a depth guide for restricting the depth to which the tip tool protrudes downward 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 fixable in a predetermined position within the guide groove and may be configured to restrict the rotation of the second cover in the second direction. The first engaging portion may be a projection protruding from the auxiliary cover toward the second side. The second engaging portion may be the guide groove. According to this embodiment, the base portion and the second cover can be engaged using the guide groove of the depth guide. Therefore, the configuration of the portable machining center can be simplified.

[0015] In addition to or in lieu of the above embodiments, a biasing member provided around the shaft to bias the second cover in the first direction may be further provided. The projection may restrict the movement of the second cover in the first direction. According to this embodiment, the projection can be made to perform the function of engaging the second cover and 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 the above embodiment, or in place of the above embodiment, the system may further include a first wheel provided on the first side of the first cylindrical portion around the shaft, and a second wheel provided on the second side of the third cylindrical portion around the shaft. According to this embodiment, the shaft can perform both the function of a pivot for the cover and the function of a wheel axle for moving the portable machining tool along machining directions perpendicular to the left-right and up-down directions.

[0017] In addition to or in lieu of the above embodiments, the second cylindrical portion may have a first contact surface provided on the first side. The third cylindrical portion may have a second contact surface provided on the second side that contacts the first contact surface. The portable processing machine may further include a first restricting portion provided around the shaft for restricting the movement of the first cylindrical portion toward the first side, and a second restricting portion for restricting the movement of the second cylindrical portion toward the second side. According to this embodiment, movement of the entire cover portion in the left-right direction can be suppressed, thereby improving machining accuracy.

[0018] In addition to or instead of the above embodiments, the portable processing machine may be a wall chaser. The tip tool may include a plurality of cutting tools that are mounted on the tool mounting portion. According to this embodiment, a wall chaser can be provided in which the cover portion can be easily opened.

[0019] <Overall Structure> The following describes a wall chaser 1 as one embodiment of the present disclosure with reference to Figures 1 to 27. The wall chaser 1 is a portable processing machine for cutting grooves in materials such as walls, floors, and ceilings. The wall chaser 1 is also called a double-row groove cutter and can cut two rows of grooves simultaneously. As shown in Figures 1 and 2, the wall chaser 1 comprises a base portion 2 and a main body portion 3. The base portion 2 comprises a substantially flat base 21. The main body portion 3 is positioned on one side of the base 21. The base 21 is substantially rectangular in shape. The surface of the base 21 opposite the main body portion 3 is formed flat and functions as a contact surface 23 for contacting the processing material (floor, ceiling, wall, etc.).

[0020] As shown in Figure 11, the main body 3 is configured to rotate two roughly disc-shaped cutting tools 101 and 102 mounted on the spindle 40 around the rotation axis AX2 of the spindle 40. The rotation axis AX2 is also called the output axis. The cutting tools 101 and 102 are also called diamond blades. The cutting tools 101 and 102 are arranged to be parallel to each other. The contact surface 23 of the base 2 is brought into contact with the workpiece, and the rotating cutting tools 101 and 102 protrude beyond the contact surface 23 to the opposite side of the main body 3, as shown in Figures 5 to 7. By moving the wall chaser 1 in a direction perpendicular to the direction in which the cutting tools 101 and 102 are aligned parallel to each other (in other words, the direction in which the output axis AX2 extends) and parallel to the contact surface 23, grooving of the workpiece is carried out. The rotation direction of the cutting tools is counterclockwise when viewed from the direction of the first cover 51 (leftward). As shown in Figures 1, 2, and 5, the first cover 51 has an arrow 8 engraved on it indicating the rotation direction of the cutting tools 101 and 102. Also, as shown in Figures 3 and 7, the gear housing 31 has an arrow 9 engraved on it indicating the rotation direction of the cutting tools 101 and 102.

[0021] This creates two linear grooves in the workpiece at positions corresponding to the movement paths of the cutting tools 101 and 102. The area between these two grooves is then removed by any tool, ultimately forming one large groove. This groove can, for example, accommodate electrical wiring.

[0022] For the sake of explanation, in the following, the machining direction in which the wall chaser 1 is moved relative to the workpiece during groove cutting is defined as the front-to-back direction of the wall chaser 1. Of the front-to-back direction, the side closer to the output shaft AX2 is defined as the front side of the wall chaser 1, and the side further from the output shaft AX2 is defined as the rear side of the wall chaser 1. In addition, in the direction perpendicular to the contact surface 23 (in other words, the direction perpendicular to the front-to-back 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. Furthermore, the direction perpendicular to the front-to-back direction and the up-and-down direction is defined as the left-to-right direction of the wall chaser 1. Of the left-to-right direction, the right side when viewed from the rear to the front 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 groove cutting is advanced by the wall chaser 1 (hereinafter also referred to as the machining progress direction) is from the front to the rear. However, the wall chaser 1 may be designed so that the machining direction proceeds 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 proceeds from the front to the rear and from the rear to the front, depending on the situation.

[0023] As shown in Figure 3, the main body 3 comprises a cover body 50 and a main body housing 30. As shown in Figure 1, the cover body 50 is configured to cover the left, right, and top sides of the cutting tools 101 and 102. The cover body 50 includes a first cover 51 and a second cover 55, which are configured to be separable in the left-right direction. The first cover 51 constitutes the left portion of the cover body 50. The first cover 51 is positioned to cover the left and top sides of the cutting tool 101. The second cover 55 constitutes the right portion of the cover body 50. The second cover 55 is positioned to cover the right and top sides 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 located on the upper part 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 housing 30 is positioned to the right of the cover body 50. As shown in Figure 3, the main housing 30 is formed in a generally cylindrical shape and extends in the front-to-back direction. The main housing 30 includes a gear housing 31, a motor housing 37, and a controller housing 38, arranged in front of back in that order. The gear housing 31 is connected to the second cover 55 in the left-to-right direction. In this embodiment, the gear housing 31 is made of metal. Therefore, the gear housing 31 and the second cover 55 can be firmly connected.

[0026] As shown in Figure 11, the gear housing 31 accommodates the right portion 402 of the spindle 40 with the left portion 401 of the spindle 40 protruding from the cover body 50. The left portion 401 of the spindle 40 constitutes a tool mounting section for which cutting tools 101 and 102 are detachably attached. A gear mechanism 4 is housed inside the gear housing 31. The gear mechanism 4 includes a small bevel gear 412 and a large bevel gear 413 fixed around the spindle 40 and meshing with the small bevel gear 412.

[0027] An electric motor 371 is housed within the motor housing 37. The motor 371 includes a motor shaft 372 that is rotatably supported by bearings spaced apart in the front-rear direction. The motor shaft 372 is rotatable about a rotation axis AX1 that extends in the front-rear direction. The rotation axis AX1 of the motor shaft 372 intersects (is perpendicular to) the output shaft AX2. The front end of the motor shaft 372 is located within 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 rotational driving force to the spindle 40 about the output shaft AX2 via the gear mechanism 4.

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

[0029] As shown in Figures 1 to 3, the base portion 2 is provided with an auxiliary cover 22 that extends from the base 21 toward the opposite side of the contact surface 23 (towards the main body portion 3). The auxiliary cover 22 extends inside the first cover 51 and the second cover 55, and extends above the lower edges of the first cover 51 and the second cover 55.

[0030] As shown in Figure 12, the base portion 2 has a third cylindrical portion 25 at its rear end, which has a hole 259 that penetrates 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, respectively, which have holes 549 and 589 that penetrate in the left-right direction. As shown in Figure 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. A metal shaft 26 is arranged on the upper side of the base 21 so as to penetrate the 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 axis 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 it is pressed against the workpiece and moved in the forward and backward directions during processing. As shown in Figure 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 part of the wheel 271 and 272 that comes into contact with 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 weight reduction of the wheels 271 and 272 and improved wear resistance.

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

[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 Figure 12) arranged to surround the shaft 26. Therefore, in the initial state, the main body 3 is held in the position shown in Figures 1 to 3. This position of the main body 3 is also referred to as the top dead center.

[0034] As shown in Figures 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 Figure 21, the auxiliary cover 22 is provided with a projection 27 that protrudes to the right. The upper end of the projection 27 is in approximately the same position as the upper edge 29 of the auxiliary cover 22 (see Figure 21). The projection 27 protrudes into the through hole 57. The projection 27 is engageable with the through hole 57. When the projection 27 engages with the through hole 57, the base portion 2 and the second cover 55 are engaged in the left-right direction. When the contact surface 23 comes into contact with the workpiece and the cover body 50 rotates, the second cover 55 rotates, and the relative position of the projection 27 with respect to the through hole 57 changes.

[0035] The projection 27 is positioned at the lower end of the through hole 57, which defines the position of the top dead center and prevents the lower edge of the cover body 50 from being displaced above the upper edge 29 of the auxiliary cover 22. As shown in Figures 1 to 3, when the main body 3 is at the top dead center, the cutting tools 101 and 102 are positioned above the base 21. At this time, the auxiliary cover 22 of the base 2 covers the portion of the cutting tools 101 and 102 that is below the cover body 50.

[0036] The position of the lower moving end (lower movable limit position) of the main body 3 in relation 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 Figure 10, the depth guide 63 includes a stopper 633 and a through hole 57. The stopper 633 is configured to be fixable at any position in the through hole 57. In this embodiment, the stopper 633 includes an operating knob 634 located outside (to the right) of 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 (to the left) of the second cover 55. The operating knob 634 is attached around the head of the bolt. The user can move the stopper 633 to any position along the arc shape of the through hole 57 by operating the operating knob 634 to loosen the bolt. When the user tightens the operating knob 634, the bolt and nut 635 tighten the second cover 55 in the left-right direction. This fixes the stopper 633 in the moved position relative to the second cover 55.

[0037] The main body 3 can be pushed down by the user (rotated in the second direction R2) until the stopper 633 contacts the upper edge 29 of the auxiliary cover 22. In other words, the position where the depth guide 63 and the upper edge 29 of the auxiliary cover 22 contact is the position of the lower moving end of the main body 3. In this embodiment, with the position of the lower moving end set to the lowest part of the movable range by the depth guide 63, the position of the main body 3 when it is lowered to the lower moving end is also called the bottom dead center. In this embodiment, the bottom dead center is the position of the main body 3 when it is lowered to the lower moving end with the stopper 633 fixed to the upper end of the through hole 57.

[0038] As shown in Figures 5 to 7 and Figure 10, when the main body 3 is at the bottom dead center (or at the lower moving end), the cutting tools 101 and 102 partially protrude downwards beyond the contact surface 23 of the base 21 through the through hole 24 (see Figure 8) of the base 21. This mechanism allows the user to adjust the cutting depth with the cutting tools 101 and 102. When the user releases the downward force pushing the main body 3 while it is at the lower moving end, the main body 3 returns to the top dead center due to the biasing force of the torsion spring 62.

[0039] As shown in Figure 9, the main body 3 includes a battery mounting section 39 configured to detachably accommodate a battery 200 for supplying power to the motor 371. The battery mounting section 39 is located in the upper part of the controller housing 38. The battery mounting section 39 has a slide guide and power supply terminals 391 for when the battery is installed. The battery mounting section 39 allows the battery 200 to be detached by sliding it from the rear to the front. 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 supply with a nominal voltage of 36 volts (V) and is relatively heavy. In other embodiments, a battery with a higher nominal voltage may be used as the power source for the motor 371. Alternatively, a commercial power supply may be used instead of the battery 200.

[0040] The main body 3 further comprises a first handle 64 and a second handle 65. As shown in Figures 6 and 7, the first handle 64 is located on the rear side of the controller housing 38. The first handle 64 is a so-called loop handle and is equipped with a first gripping portion 641 for the user to grasp by hand. An operating member (trigger 642) for starting and stopping the motor 371 is attached to the first gripping portion 641.

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

[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 in three positions: one in which the first gripping portion 641 is approximately parallel to the output shaft AX2, one rotated 90 degrees to the right from the position shown in Figure 1 (see Figures 6, 7, and 9), and one rotated 90 degrees to the left from the position shown in Figure 1.

[0043] An intake port 382 equipped with a filter is provided at the rear end of the controller housing 38, in the portion facing the first gripping portion 641. When the fan 373 (see Figure 10) located inside the motor housing 37 rotates, air from outside the wall chaser 1 flows into the main body housing 30 through the intake port 382 and is discharged from the exhaust port 301 (described later) provided in the gear housing 31. This cools the motor 371.

[0044] As shown in Figure 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 comprises a second gripping portion 651 for the user to grasp with their hand, a base portion 652, bridge portions 653, 653, a cylindrical portion 654, a shaft (not shown), and an operating knob 655.

[0045] The second gripping portion 651 extends parallel to the output shaft AX2, that is, in the left-right direction. The cylindrical portion 654 is a part integrally formed with the second cover 55 so as to protrude upward from the second cover 55. The base portions 652 are positioned on the left and right sides of the cylindrical portion 654. The bridge portions 653, 653 connect the cylindrical portion 654 and the base portions 652 to the second gripping portion 651 so as to create a gap between the cylindrical portion 654 and the base portions 652. The shaft passes through the base portions 652 and the cylindrical portion 654 in the left-right direction. The operating knob 655 is attached to the right end of the shaft. The second handle 65 is configured to rotate around the shaft when the user loosens the operating knob 655. When the user tightens the operating knob 655, the base portion 652 and the cylindrical portion 654 are fixed in the left-right direction by the operating knob 655 and a nut (not shown) provided at the tip of the shaft, thereby fixing the rotational position of the second handle 65.

[0046] In this embodiment, the cylindrical portion 654 is made of metal and is integrally formed with the second cover 55. Furthermore, the gear housing 31, which is connected to the second cover 55 and houses the right portion 402 of the spindle 40, the spindle 40 that rotates the cutting tools 101 and 102, and several components 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 embedded in the wall during processing, a current path may be formed from the cutting tools 101 and 102 through the spindle 40 and the components around the spindle 40 to the second cover 55 and the cylindrical portion 654. In the wall chaser 1 of this embodiment, the second gripping portion 651, base portion 652, and bridge portion 653 of the second handle 65 are made of synthetic resin. Therefore, even if the aforementioned current path is unintentionally formed, it is prevented from reaching the second gripping portion 651.

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

[0048] <Configuration of the insulation mechanism> First, the gear housing 31 and its internal configuration will be described in detail. As shown in Figure 13, the gear housing 31 includes a gear housing 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 body 32 is open at the left end and the rear end. The gear housing body 32 accommodates the right portion 402 of the spindle 40 and a plurality of intervening members 41 (see Figure 14) provided around the right portion 402.

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

[0050] As shown in Figure 14, multiple intervening members 41 are provided around the spindle 40 within the gear housing 31. Specifically, around the spindle 40, from right to left, are arranged a first bearing 411, a large bevel gear 413, a bearing retainer 414, a second bearing 415, and a washer 416, all of which are made of metal. The spindle 40 is held in the gear housing 31 so as to be rotatable around the output shaft AX2 by the first bearing 411 and the second bearing 415. 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 located radially outside the second bearing 415.

[0051] The bearing box 33 has a cylindrical portion 332 that extends in the left-right direction, and a flange 331 that protrudes radially outward with respect to the output shaft AX2 at the 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 Figure 8).

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

[0053] As shown in Figure 14, the first connecting portion 551 is formed in a substantially 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. Also, 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 radially outer side of the cylindrical portion 332.

[0054] A spacer 81 made of insulating material is interposed between the cylindrical portion 332 of the bearing box 33 and the first connecting portion 551. The spacer 81 comprises 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 projecting 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. This gap G extends in the left-right direction. The flange 811 of the spacer 81 is positioned in the left-right direction between the flange 331 of the bearing box 33 and the right end 552 of the first connecting portion 551. The flange 331 of the spacer 81 is visible on the outside of the wall chaser 1 (see Figures 8 and 14).

[0055] As shown in Figure 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. Also, 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 to overlap each other in the left-right direction. A virtual plane P perpendicular to the output shaft AX2 and passing 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 tightened circumferentially by a screw 559 (see Figure 7) with the spacer 81 positioned radially outward from the cylindrical portion 332 of the bearing box 33. By tightening the first connecting portion 551 with the screw 559, the gap G between the cylindrical portions 812 of the spacer 81 is reduced circumferentially. 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 Figure 14, the gap G is almost completely closed circumferentially.

[0057] As shown in Figure 15, the second connecting portion 554 has a hole 555 that extends in the left-right direction. A male threaded portion 557 into which a 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 to the left, with the central axis AX4 of the hole 555 as the center.

[0058] The second connecting portion 554 is provided so as to face the third connecting portion 34 of the gear housing 31 in the left-right direction. The 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. Around the through hole 341 at the left end 345 of the third connecting portion 34, a recess 342 is provided that is recessed to the right from the left end 345.

[0059] A first bush 82, made of insulating material, is interposed between the third connecting portion 34 and the second connecting portion 554. The first bush 82 is formed in a substantially cylindrical shape and has 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 that project to the left and right sides, respectively. The protrusions 822 and 823 are fitted into recesses 556 provided in the second connecting portion 554 and recesses 342 provided in the third connecting portion 34, respectively. The outer surface 824 of the first bush 82 is visible on the outside of the wall chaser 1.

[0060] A second bush 84, made of insulating material, is positioned 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 projecting 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 approximately 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 is visible on the outside of 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 comprises a head 861 and a bolt shaft 862. The tip 863 of the bolt shaft 862 is screwed into the male threaded portion 557 of the second connecting portion 554. The head 87 is pressed against the 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 placed between the third connecting portion 34 and the second connecting portion 554 in the left-right direction, and the cylindrical portion 842 of the second bush 84 is placed radially inward between 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 its tip 863 is screwed into the male threaded 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 positioned between the bearing box 33 and the first connecting portion 551, blocking the current path between the bearing box 33 and the first connecting portion 551. More specifically, as shown in Figures 13 and 14, the cylindrical portion 812 of the spacer 81 blocks the current path C1 between the bearing box 33 and the first connecting portion 551 in the direction perpendicular to the output shaft AX2 (radial direction). The flange 811 of the spacer 81 blocks the current path C2 between the bearing box 33 and the first connecting portion 551 in the left-right direction.

[0064] The second bush 84 is also positioned across the third connecting portion 34 and the second connecting portion 554, blocking the current path between the third connecting portion 34 and the second connecting portion 554. More specifically, as shown in Figures 13 and 15, the cylindrical portion 842 of the second bush 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 bush 84 blocks the current path C5 between the third connecting portion 34 and the second connecting portion 554 via the head 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 a plurality of metal intervening members 41 including a metal spindle 40 and bolts 86 can be effectively blocked by the spacer 81, the first bush 82, and the second bush 84. Therefore, the current reaching the second cover 55 is suppressed. Consequently, it is permissible for the user's fingers to unintentionally touch the cover body 50.

[0066] Furthermore, since the metal gear housing 31 and the metal second cover 55 can be connected by metal bolts 86, the connection strength and impact resistance can be increased. In this embodiment, die-cast aluminum alloy is used for the cutting tool 101, the cutting tool 102, the second cover 55, the cylindrical part 654, and the gear housing 31. Therefore, the connection strength and impact resistance are further enhanced.

[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 fibers. The spacer 81, the first bush 82, and the second bush 84 only need to be made of an insulating material, and any synthetic resin may be used, for example.

[0068] <Configuration of the impact dispersion mechanism> The impact dispersion (mitigation) mechanism will be described below using Figures 8 and 15 to 17. In the following, the part of the Wall Chaser 1 that is located to the right of the cover body 50 will also be referred to as the right part 3R. Furthermore, the part of the right part 3R that is located behind the gear housing 31 will also be referred to as the rear part 3RB. The right part 3R includes the gear mechanism 4 and motor 371 housed in the main housing 30, which are the main components for driving the Wall Chaser 1. In the Wall Chaser 1 of this embodiment, a mechanism is employed to suppress the localized concentration of impact on these main components and the main housing 30 that houses the main components when the Wall Chaser 1 falls with the right part 3R (the right surface of the Wall Chaser 1) facing approximately vertically downward.

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

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

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

[0072] As shown in Figures 17 and 18, the gear housing body 32 includes a main body portion 325, a first connecting portion 321, a second connecting portion 323, and a first protruding portion 70. The main body portion 325 is the part of the gear housing body 32 that houses the intervening member 41, which includes the gear mechanism 4. The width of the main body portion 325 in the left-right direction is smaller than that of the motor housing 37 (see Figure 8).

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

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

[0075] As shown in Figures 17 and 18, the first projection 70 comprises 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 Figures 16 and 17, the second rib 72 is located in front of 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 Figures 8 and 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 plane P3. In other words, the distance from plane P2 to each of the right ends 711, 721, and 731 is equal. The inclined rib 74 is connected to the front end of the second rib 72. As shown in Figure 18, the inclined rib 74 is formed such that its projection height from the right surface 326 decreases as it moves towards the front. The front end 741 of the inclined rib 74 is connected to the right surface 326.

[0076] The first projection 70 further comprises an inclined rib 75. The inclined rib 75 is provided on the lower and front side of the first rib 71. The inclined rib 75 extends substantially parallel to the inclined rib 74 described above, and is formed such that the height of the projection from the right surface 326 decreases as it moves towards the front. 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 a connecting rib 76. As described above, the first projection 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 port 301 provided on the gear housing body 32. As shown in Figure 17, the exhaust port 301 is located in front of the first rib 71 and behind the front end 741 of the inclined rib 74. In addition, most of the exhaust port 301 is located between the second rib 72 and the inclined rib 74 and the inclined rib 75 in the vertical direction. The first protrusion 70 partially covers the periphery of the exhaust port 301 while leaving the front of the exhaust port 301 open. When the fan 373 rotates, air flows into the main housing 30 from the intake port 382 provided at the rear end of the rear portion 3RB and is discharged from the exhaust port 301. This cools the motor 371.

[0078] As shown in Figure 17, a recess 328 is formed on the front side of the inclined rib 75 in the main body 325, extending from the right surface 326 toward the left. As shown in Figure 8, a shaft lock switch 91 is positioned in the recess 328. When the user pushes the shaft lock switch 91 against the gear housing 31 and rotates the spindle 40 (cutting tools 101, 102) with their fingers, and the shaft 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 unable to rotate. This allows the user to rotate the lock nut 47 to remove and replace the cutting tools 101, 102 from the spindle 40.

[0079] As described above, the wall chaser 1 of this embodiment has a first protrusion 70 provided on the gear housing 31 and a second protrusion 3T provided on the rear portion 3RB. Therefore, even if the wall chaser 1 falls with its right side facing approximately vertically downwards, the first protrusion 70 and the second protrusion 3T will hit the ground or the like, thus dispersing the impact of the fall. As a result, the wall chaser 1 can be protected from the impact of the fall.

[0080] Furthermore, since the first protrusion 70 is formed by connecting multiple ribs 71 to 76, the contact area during a fall can be increased. Therefore, the impact during a fall can be better dispersed.

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

[0082] Furthermore, the second rib 72 is parallel to the plane P2, that is, it extends in the machining direction of the wall chaser 1. Therefore, by visually observing the second rib 72, the user can easily recognize whether or not the wall chaser 1 is tilted relative to the horizontal direction. This improves machining accuracy.

[0083] Furthermore, since the first rib 71 and the second rib 72 are connected by a connecting rib 73 that intersects the plane P1, deformation of the first protruding portion 70 due to impact during a fall can be suppressed compared to a configuration in which the first rib 71 and the second rib 72 are connected at a right angle.

[0084] Furthermore, the front end 741 of the second rib 72 is provided with an inclined rib 74 whose protrusion height to the right decreases as it moves away from the second rib 72. Therefore, even if stress is applied in a direction intersecting planes P2 and P3 when the wall chaser 1 falls, for example, the inclined rib 74 can alleviate this stress.

[0085] Furthermore, the first protrusion 70 is provided around the exhaust port 301 that discharges cooling air from the motor 371. This allows for effective use of the space in the gear housing 31. In addition, since the first protrusion 70 partially covers the area around the exhaust port 301 while leaving the direction in which air is discharged from the exhaust port 301 open, the cooling efficiency of the motor 371 can be maintained.

[0086] Furthermore, the connection between the first connection portion 321 and the second connection portion 323 in the gear housing 31 constitutes corner portions 324, 324. Since the corner portions 324 form approximately right angles, stress tends to concentrate relatively easily there. However, in the wall chaser 1 of this embodiment, the impact during a fall is effectively dispersed by the first protrusion 70 and the second protrusion 3T, so that cracks in the gear housing 31 originating from the corner portions 324 can be effectively suppressed. In addition, since the first connection portion 321 and the second connection portion 323 are connected at right angles, the wall chaser 1 of this embodiment also has the advantage that other parts can be easily placed on the left side of the gear housing body 32.

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

[0088] Furthermore, the wall chaser 1 of this embodiment is equipped with a battery mounting section 39 to which the battery 200 is detachably attached. Due to the weight of the battery 200, the impact during a fall tends to be greater. However, the wall chaser 1 of this embodiment can more effectively disperse the impact during a fall.

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

[0090] As shown in Figure 19, the rear end of the first cover 51, the rear end of the base 2, and the rear end of the second cover 55 are provided with a first cylindrical portion 54, a third cylindrical portion 25, and a second cylindrical portion 58, respectively. The first cylindrical portion 54, the third cylindrical portion 25, and the second cylindrical portion 58 are mounted on the base 21. The first cylindrical portion 54, the third cylindrical portion 25, and the second cylindrical portion 58 are each formed in a substantially cylindrical shape with holes 549, 259, and 589 (see Figure 12) that penetrate in the left-right direction. A 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 in this order from left to right so as to be rotatable around the shaft 26.

[0091] As shown in Figure 20, the right portion of the first cylindrical portion 54 is provided with a first contact portion 541 and a first recess 542. The first contact portion 541 is a block-shaped portion that protrudes to the right of the first cylindrical portion 54. The first contact portion 541 can also be described as a convex portion of the first cylindrical portion 54. The right end of the first contact portion 541 is perpendicular to the pivot axis AX3. The first recess 542 is provided on the second direction R2 side relative to the first contact portion 541 in the circumferential direction around the pivot axis AX3, and is recessed to the left of the first contact portion 541. 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 Figure 19, the left end of the first cylindrical portion 54 constitutes a contact surface 547 perpendicular to the pivot axis AX3. The contact surface 547 is in contact with a retaining ring 277 provided around the shaft 26. The retaining ring 277 restricts the movement of the first cylindrical portion 54 to the left.

[0092] As shown in Figures 21 and 22, the left portion of the third cylindrical part 25 is provided with a second contact portion 252, a third contact portion 253, and an inclined portion 254. The second contact portion 252 is the part that protrudes furthest to the left of the third cylindrical part 25. The second contact portion 252 can also be described as a convex portion of the third cylindrical part 25. The left end of the second contact portion 252 is perpendicular to the pivot axis AX3. As shown in Figure 23, the third contact portion 253 is provided on the first direction R1 side relative to the second contact portion 252. Also, as shown in Figure 22, the third contact portion 253 is recessed to the right of the second contact portion 252. The third contact portion 253 is also called the second recess. The inclined portion 254 is the part that connects the second contact portion 252 and the third contact portion 253 in the circumferential direction. The inclined portion 254 is formed such that the amount of protrusion toward the side (left side) of the first cover 51 gradually decreases as it moves toward the first direction R1. In this way, the left portion of the third cylindrical portion 25 exhibits a stepped shape. As shown in Figure 19, the right end of the third cylindrical portion 25 constitutes a contact surface 255 perpendicular to the pivot axis AX3.

[0093] As shown in Figure 19, the second cylindrical portion 58 has a contact surface 581 (first contact surface) at its left end and a contact surface 582 at its right end. The contact surfaces 581 and 582 are perpendicular to the pivot axis AX3. The contact surface 581 contacts the contact surface 255 (second contact surface) of the third cylindrical portion 25. The contact surface 582 contacts a retaining ring 278 provided around the shaft 26. The retaining ring 278 restricts the movement of the second cylindrical portion 58 to the right.

[0094] When the wall chaser 1 is in a state where 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, Figure 3). Also, under normal conditions, the first cover 51 and the second cover 55 are connected in the left-right direction by the connecting part 59 and rotate together as a unit around the pivot axis AX3. In other words, the first cover 51 does not rotate independently.

[0095] Figures 24 and 25 show schematic diagrams of the cover portion 5 as seen from above around the shaft 26. (a) shows the cover portion 5 in its normal state, and (b) shows the state in which the connection between the first cover 51 and the second cover 55 is released and the first cover 51 rotates independently. In its normal state, the first contact portion 541 of the first cylindrical portion 54 and the second contact portion 252 of the third cylindrical portion 25 are in contact in the left-right direction (see Figures 19 and 25). Therefore, the movement of the third cylindrical portion 25 to the left is restricted by the first contact portion 541. Also, as described above, the retaining rings 277 and 278 restrict the movement of the entire first cylindrical portion 54, second cylindrical portion 58, and third cylindrical portion 25 in the left-right direction. Therefore, in the wall chaser 1 of this embodiment, the movement of the cover portion 5 on the shaft 26 in the left-right direction is suppressed during machining.

[0096] When the connection by the connecting portion 59 is released, the first cover 51 becomes able to rotate independently around the shaft 26. However, since the projection 27 of the base portion 2 is engaged with the through hole 57 of the second cover 55, the base portion 2 cannot rotate independently.

[0097] As shown in Figures 24 and 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 different position from the second contact portion 252 in the circumferential direction. The range of rotation angles 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 angular range. The first angular range is, for example, the range of rotation angles of the first cover 51 until the first contact portion 541 moves to a different position from the second contact portion 252 in the circumferential direction when the first cover 51 is rotated from the reference position in the first direction R1. The reference position is, for example, a predetermined position of the first cover 51 at top dead center (e.g., 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 the first angular 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 rotated further in the first direction R1 beyond the first angular range, the first recess 542 is positioned to the left of the second contact portion 252. In other words, a space is created to the left of the second contact portion 252. Therefore, the second contact portion 252 becomes movable toward the first recess 542, as shown by the arrow AR in Figure 25(b). In other words, the third cylindrical portion 25 (base portion 2) becomes movable to the left.

[0099] Furthermore, the inclined portion 254 and the third contact portion 253 are located on the first direction R1 side of the second contact portion 252. Therefore, as the first cover 51 rotates in the first direction R1 beyond the first angular range, the inclined portion 254 is positioned to the right of the first contact portion 541, followed by the third contact portion 253. In this embodiment, the difference in the amount of protrusion to the left between the second contact portion 252 and the third contact 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 contact portion 252 moves into the first recess 542, and the third contact portion 253 comes into contact with the first contact portion 541. In other words, when the rotational range of the first cover 51 exceeds the first angular range, the base portion 2 can move to the left until the third contact portion 253 contacts the first contact portion 541. The rotational angle of the first cover 51 relative to the reference position that exceeds the first angular range is also called the second angular range. The second angular range is also the range of rotational angles of the first cover 51 in which the left-right engagement between the base portion 2 and the second cover 55 is released.

[0100] In this embodiment, the distance between the first contact portion 541 and the third contact portion 253 in the left-right direction is adjusted so that when the base portion 2 is moved to the left, the projection 27 of the base portion 2 can be removed from the through hole 57 of the second cover 55. Therefore, when the first cover 51 is rotated beyond the first angular 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 fully exposed on the left side (see Figure 26). As described above, in the wall chaser 1 of this embodiment, by rotating the first cover 51 beyond the first angular range in the first direction R1, the cover portion 5 can be easily opened, 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 toward the first cover 51 side (left side), and the base portion 2 can be rotated in the second direction R2. Therefore, the cover portion 5 can be easily opened. Accordingly, the wall chaser 1 of this embodiment has the advantage that the blades 101 and 102 can be easily replaced.

[0102] Furthermore, under normal conditions, the first contact portion 541 of the first cover 51 and the second contact portion 252 of the second cover 55 come into contact, restricting the movement of the second cover 55 to the left. As a result, the movement of the cover portion 5 along the shaft 26 in the left-right direction during machining is suppressed. Consequently, the machining accuracy of the wall chaser 1 can be improved.

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

[0104] Furthermore, 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 the shafts for the wheels 271 and 272 that move 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 disclosed herein is shown below. However, each component of the embodiment is merely an example and does not limit the components of the technology disclosed herein. Wall Chaser 1 is an example of a "portable machining center". Output shaft AX2 is an example of an "output shaft". Shaft AX3 is an example of a "first shaft". Cutting tools 101 and 102 are examples of "tip tools" and "multiple cutting tools". Spindle 40 is an example of a "spindle". Left part 401 is an example of a "tool mounting part". Base part 2 is an example of a "base part". Cover part 5 is an example of a "cover part". First cover 51 and second cover 55 are examples of a "first cover" and a "second cover", respectively. First direction R1 and second direction R2 are examples of a "first direction" and a "second direction", respectively. Left side and right side are examples of a "first side" and a "second side", respectively. First cylindrical part 54, second cylindrical part 58, and 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 a "contact surface" and a "through hole," respectively. The first contact part 541 and the second contact part 252 are examples of a "first contact part" and a "second contact part," respectively. The first recess 542 is an example of a "first recess." The third contact part 253 and the inclined part 254 are examples of a "third contact part." The base 21 and the auxiliary cover 22 are examples of a "base body" and an "auxiliary cover," respectively. The projection 27 is an example of a "first engaging part" and a "projection." The through hole 57 is an example of a "second engaging part" and a "guide groove." The depth guide 63 and the stopper 633 are examples of a "depth guide" and a "stopper," respectively. The torsion spring 62 is an example of a "biasing member." The wheels 271 and 272 are examples of a "first wheel" and a "second wheel," respectively. Contact surfaces 581 and 255 are examples of the "first contact surface" and "second contact surface," respectively. Retaining rings 277 and 278 are examples of the "first restricting section" and "second restricting section," respectively.

[0106] It should be noted that the above embodiments are merely illustrative, and the morphological processing machine according to this disclosure is not limited to the illustrated wall chaser 1. For example, modifications as illustrated below can be made. Furthermore, at least one of these modifications may be adopted in combination with the wall chaser 1 illustrated in the embodiments and at least one of the features described in each claim.

[0107] The following modifications are possible with respect to the insulation mechanism of the wall chaser 1. For example, as long as the plurality of intervening members 41 include at least one insulating member that insulates the spindle 40 and the second cover 55, the configuration of the plurality of intervening members 41 and at least one insulating member can be appropriately changed depending on 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 have a second connecting portion 554 and a third connecting portion 34, if at least a spacer 81 is placed 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 interrupted. Therefore, the same effect as in the above-described embodiment is achieved. Also, if the second connecting portion 554 and the third connecting portion 34 are connected by something other than a metal bolt 86, the second bush 84 may be omitted.

[0108] Furthermore, the second cover 55 may have a first connecting portion 551 and a second connecting portion 554 with the gear housing 31 made of metal, while the other parts may be made of synthetic resin. Even with this configuration, it is possible to suppress the current from reaching the metal part of the second cover 55, thus achieving the same effects as in the embodiment described above.

[0109] Furthermore, if the gear housing 31 and the second cover 55 are connected by 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 screwed, and the other may be provided with a hole (first hole) into which the bolt shaft 862 can be placed. For example, the gear housing 31 may be provided with a male threaded portion 557, and the second connecting portion 554 may be provided with a hole (first hole) into which the cylindrical portion 842 of the second bush 84 can be placed.

[0110] The following modifications are possible with respect to the impact dispersion mechanism. For example, the configuration of the first protrusion 70 can be appropriately changed depending on 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 do not have to be connected. Alternatively, the first protrusion 70 does not have to include either the first rib 71 or the second rib 72. Similarly, the configuration of the second protrusion 3T can be appropriately changed depending on 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 to protrude to the right from the controller housing 38.

[0111] The following modifications are possible with respect to the configuration of the cover portion 5. For example, the configuration of the cover portion 5 can be modified as appropriate, insofar as the movement of the base portion 2 to the left (towards the first cover 51) is restricted when the rotation angle of the first cover 51 in the first direction R1 is within the first angular range, and the movement of the base portion 2 to the left is permitted when the rotation angle of the first cover 51 in the first direction R1 exceeds the first angular range. For example, the first contact portion 541 of the first cover 51 and the second contact portion 252 of the base portion 2 are 、 These may be provided on parts other than the first cylindrical portion 54 of the first cover 51 and the third cylindrical portion 25 of the base portion 2.

[0112] Furthermore, the configuration for engaging the base portion 2 and the second cover 55 in the left-right direction can be modified as appropriate, insofar as it engages when the movement of the base portion 2 to the left (towards the first cover 51) is restricted, and the engagement is released as the base portion 2 moves to the left. For example, the second cover 55 may have a groove different from the through hole 57 of the depth guide 63, and the projection 27 may engage with the groove. Alternatively, the projection 27 may engage with any part fixed to the base portion 2. Alternatively, the second cover 55 may have a projection, and the base portion 2 may have a groove into which the projection engages.

[0113] Furthermore, the configurations of the first cylindrical portion 54, the second cylindrical portion 58, and the third cylindrical portion 25 can be modified as appropriate, as long as they are rotatably mounted 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 of it spaced apart in the circumferential direction.

[0114] Furthermore, the configuration of the first contact portion 541, the second contact portion 252, the third contact portion 253, and the first recess 542 can be modified as appropriate, insofar as the first contact portion 541 and the second contact portion 252 come into contact when the rotation angle of the first cover 51 is within a first angular range, and the contact is released when it exceeds the first angular range.

[0115] Furthermore, the first cover 51 and the second cover 55 can be modified as appropriate, as 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 necessarily have to be connected by the connecting portion 59 at all times. Alternatively, if the first cover 51 and the second cover 55 are connected, the configuration of the connecting portion 59 can be modified as appropriate.

[0116] In the above embodiment, cutting tools 101 and 102 for forming two rows of grooves were used as the tip tools of the wall chaser 1. Alternatively, three or more cutting tools may be used. Or, a single cutting tool having two or more rows of cutting edges 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 grooving cutter, etc.).

[0118] In view of the spirit of the present invention and the embodiments described above, the following embodiments are constructed. At least one of the following embodiments may be adopted in combination with the features of the embodiments and their modifications, or at least one of the features described in each claim. [Explanation of Symbols]

[0119] 1: Wall chaser, 2: Base part, 3: Main body part, 3R: Right part, 3RB: Rear part, 3T: Second projection part, 4: Gear mechanism, 5: Cover part, 8: Arrow, 9: Arrow, 21: Base, 22: Auxiliary cover, 23: Contact surface, 24: Through hole, 25: Third cylindrical part, 26: Shaft, 27: Projection, 29: Upper edge part, 30: Main body housing, 31: Gear housing, 32: Gear housing body, 33: Bearing box, 34: Third connecting part, 37: Motor housing, 38: Controller housing, 39: Battery mounting part, 40: Spindle, 41: Intervening member, 46: Inner flange, 47: Lock nut, 48: Spacer, 50: Cover body, 51: First cover 、54: First cylindrical part, 55: Second cover, 56: Right wall, 57: Through hole, 58: Second cylindrical part, 59: Connecting part, 62: Torsion spring, 63: Depth guide, 64: First handle, 65: Second handle, 70: First projection, 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 part, 253 :Third contact part, 254:Inclined part, 255:Contact surface, 259:Hole, 262:Right end, 271:Wheel, 272:Wheel, 273:Main body, 274:Coating part, 277:Retaining ring, 278:Retaining ring, 301:Exhaust hole, 321:First connection part, 322L:Left end, 322R:Right end, 323:Second connection part, 324:Corner part, 325:Main body, 326:Right surface, 328:Recess, 331:Flange, 332:Cylinder part, 333:Left end, 335:Screw, 341:Through hole, 342:Recess, 343:Right end, 344:Right surface, 345:Left end, 371:Motor, 372:Motor shaft, 373:F Fan, 374: Outer surface, 381: Controller, 382: Intake hole, 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 part, 555: Hole, 556: Recess, 557: Male screw part, 559: Screw, 581: Contact Contact surface, 582: Contact surface, 589: Hole, 633: Stopper, 634: Operating knob, 635: Nut, 641: First gripping part, 642: Trigger, 651: Second gripping part, 652: Base, 653: Bridge part, 654: Cylinder part, 655: Operating knob, 711: Right end, 721: Right end, 731: Right end, 741: Front end, 811: Flange, 812: Cylinder part, 813: Hole, 821: Through hole, 822: Protrusion, 823: Protrusion, 824: Outer surface, 825: Right end, 841: Flange, 842: Cylinder part, 845: Hole, 861: Head, 862: Bolt shaft, 863: Tip part, AR: ArrowAX1: Rotation axis, AX2: Output axis, AX3: Axis, AX4: Center axis, 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. It is a portable processing machine, A spindle rotatable around an output axis defining the left-right direction of the portable processing machine, the spindle having a tool mounting portion configured to detachably attach a disc-shaped tip tool, A shaft having a first axis extending parallel to the output axis, A cover portion configured to cover at least a part of the tip tool attached to the tool mounting portion, A first cover comprising a first cylindrical portion provided around the shaft, covering the first side in the left-right direction with respect to the tip tool mounted on the tool mounting portion, A second cover is provided around the shaft, and covers the second side opposite to the first side in the left-right direction with respect to the tip tool attached to the tool mounting portion, A cover portion including a third cylindrical portion disposed around the shaft between the first cylindrical portion and the second cylindrical portion, a contact surface for contacting the workpiece, a through hole provided on the contact surface through which the tip tool can be exposed, and a base portion engaged with the second cover in the left-right direction, When the direction perpendicular to the contact surface is defined as the vertical direction of the portable processing machine, the first cover and the second cover are positioned above the contact surface. The first cover is configured to be rotatable around 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 device is configured to be released from engagement with the second cover by moving to the first side in the left-right direction. The aforementioned cover portion is If the rotation angle of the first cover in the first direction is within a first angular range with the position of the first cover when the first cover and the second cover are at top dead center as the reference position, the movement of the base portion toward the first side is restricted. If the rotation angle of the first cover in the first direction exceeds the first angular range, the base portion is allowed to move toward the first side, and the engagement with the second cover is released in the left-right direction. Portable processing machine.

2. A portable processing machine according to claim 1, The base portion is configured to be rotatable in the second direction when the engagement with the second cover in the left-right direction is released, in a portable processing machine.

3. A portable processing machine according to claim 1, The first cylindrical portion includes a first contact portion provided on the second side in the left-right direction, The third cylindrical portion includes a second contact portion provided on the first side in the left-right direction, A portable machining center, wherein, when the rotation angle of the first cover in the first direction is within a first angular range, the first contact portion contacts the second contact portion in the left-right direction, thereby restricting the movement of the base portion toward the first side.

4. A portable processing machine according to claim 3, A portable machining center, wherein if the rotation angle of the first cover in the first direction exceeds a first angular range, the first contact portion is moved to a different position from the second contact portion in the circumferential direction about the first axis, thereby allowing the base portion to move toward the first side.

5. A portable processing machine according to claim 4, The first cylindrical portion is provided with a first recess located on the second direction side relative to the first contact portion, A portable machining center, wherein when the rotation angle of the first cover in the first direction exceeds a first angular range, the first recess moves in conjunction with the second contact portion to align with the second contact portion in the left-right direction, and the base portion is allowed to move toward the first side.

6. A portable processing machine according to claim 4, The third cylindrical portion is provided on the first direction side with respect to the second contact portion and further comprises a third contact portion that is recessed toward the second side with respect to the second contact portion. The third contact portion is, If the rotation angle of the first cover in the first direction exceeds the first angular range, the third contact portion is aligned with the first contact portion in the left-right direction. A portable processing machine in which the base portion comes into contact with the first contact portion when the base portion is moved to the first side.

7. A portable processing machine according to claim 1, The base portion is A base body including the contact surface and the through hole, It comprises an auxiliary cover connected to the base body, positioned 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 second engaging portion engages with the first cover at least when the rotation angle of the first cover is within the first angular range. A portable machining center in which the engagement with the second engaging portion is released as the first cover is rotated beyond a first angular range and the base portion moves toward the first side.

8. A portable processing machine according to claim 7, The first cover and the second cover are rotatable together in the first and second directions, and are configured such that when rotated in the first direction, the tip tool protrudes downward from the through hole. The cover portion is a depth guide for restricting the depth to which the tip tool protrudes downward relative to the contact surface, The arc-shaped guide groove provided in the second cover, The depth guide further comprises a stopper that can be fixed in a predetermined position within the guide groove and is configured to restrict the rotation of the second cover in the second direction, The first engaging portion is a projection that protrudes from the auxiliary cover toward the second side, The second engaging portion is the guide groove, in a portable processing machine.

9. A portable processing machine according to claim 8, The system further includes a biasing member provided around the shaft that biases the second cover in the first direction, The aforementioned projection restricts the movement of the second cover in the first direction, in a portable processing machine.

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

11. A portable processing machine according to claim 1, The second cylindrical portion is provided with a first contact surface on the first side, The third cylindrical portion is provided on the second side and includes a second contact surface that contacts the first contact surface, The aforementioned portable processing machine further includes: A first restricting portion is provided around the shaft and restricts the movement of the first cylindrical portion toward the first side, A portable processing machine comprising: a second restricting portion that restricts the movement of the second cylindrical portion toward the second side.

12. A portable processing machine according to claim 1, The aforementioned portable processing machine is a wall chaser, The aforementioned tip tool is a portable machining device that includes a plurality of cutting tools attached to the tool mounting section.

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