power tools

Abstract

To provide a portable processing machine in the disclosure, whose dust cover is attached to an outdoor air introduction port and which is configured so that the dust cover can be easily detached therefrom during maintenance while preventing the dust cover from coming off casually, unlike a conventional portable processing machine in which it is troublesome to detach a dust cover and maintenance performance is not good.SOLUTION: A portable processing machine is configured so that a dust cover 15 is attached to and detached from an air intake port 12 by sliding the dust cover in a direction of a surface thereof. A pair of rails 16 and 17 and a pair of rail receiving parts 13 and 14 slidably support the dust cover 15 on a pedestal part 11a. This enables the dust cover 15 to slide in a lateral direction so that the dust cover can be easily attached and detached.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to a power tool used for cutting and polishing stone and steel pipes, for example. [Background technology]

[0002] This type of power tool has an electric motor built into the tool body as a drive source for rotating the grinding wheel or diamond hole as the cutting tool. For this reason, cooling air is drawn into the tool body to cool the electric motor. A dust cover is attached to the intake port to protect against dust. The dust cover can be removed and cleaned.

[0003] Patent Documents 1 to 3 disclose dust cover mounting structures. The dust cover disclosed in Patent Document 1 has a semi-cylindrical rubber shape, and both ends of the dust cover are hooked onto the tool body and attached to the intake port by elastic force. The dust cover disclosed in Patent Document 2 is attached to the intake port by sliding it relative to the tool body and hooking the engaging claws. The engaging claws are provided with barbs to prevent removal. The dust cover disclosed in Patent Document 3 has a triangular rubber frame, and is attached to the intake port by inserting pin-shaped protrusions on the corners into mounting holes on the tool body. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] U.S. Patent No. 8,398,465 [Patent Document 2] US Patent Application Publication No. 2020 / 0276694 [Patent Document 3] Patent No. 5961711 Summary of the Invention [Problem to be solved by the invention]

[0005] The dust cover disclosed in Patent Document 1 is difficult to attach and remove because both ends must be held to deflect it against elastic force. The dust cover disclosed in Patent Document 2 requires the removal of a barbed engaging claw, which is time-consuming. The dust cover disclosed in Patent Document 3 has a frame made of rubber that is prone to deflection, making removal time-consuming. This disclosure improves the attachment and removal operation of the dust cover. [Means for solving the problem]

[0006] One aspect of the present disclosure relates to, for example, a power tool. The power tool has, for example, a housing that houses an electric motor and an air intake provided in the housing to introduce outside air into the housing. The power tool has, for example, a flat dust cover equipped with a filter that covers the air intake, and a pair of rails provided on the dust cover along both edges of the air intake. The dust cover slides along the pair of rails in a planar direction to be attached to and detached from the housing.

[0007] Therefore, the flat dust cover can be attached to and detached from the housing by sliding it in the direction of its surface, which makes the operation of attaching and detaching the dust cover easy. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a top view of a power tool according to an embodiment. [Figure 2] 2 is a left side view of the power tool as seen from the arrow II in FIG. 1. In this figure, the left half housing is removed to expose the internal structure. [Figure 3] FIG. 3 is a view taken along the arrow III in FIG. 1 and is a right side view of the power tool. [Figure 4] 4 is a bottom view of the power tool taken along line IV-IV in Fig. 3. In this drawing, the internal structure of the tool main body is exposed. [Figure 5] 1 is a perspective view of the power tool, as seen from the right rear, with the dust cover attached. [Figure 6]1 is a perspective view of the power tool, as viewed from above and to the right, with the dust cover removed. [Figure 7] 7 is a perspective view of the dust cover, as viewed from the direction of arrow VII in FIG. [Figure 8] 8 is a cross-sectional view of the dust cover taken along line VIII-VIII in FIG. 7; [Figure 9] FIG. 9 is an enlarged view of part IX in FIG. 8. [Figure 10] 8 is a cross-sectional view of the dust cover taken along line XX in FIG. 7. [Figure 11] 1, and is a vertical cross-sectional view of the dust cover in an attached state. [Figure 12] FIG. 12 is an enlarged view of part XII in FIG. [Figure 13] 1, and is a vertical cross-sectional view of the dust cover in an attached state. [Figure 14] FIG. 14 is an enlarged view of part XIV in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] In one or more embodiments, for example, the dust cover has a pair of opposing side walls provided along both edges of the intake port, and a pair of rails protruding from one side of the pair of side walls toward the other side, such that the dust cover is slidably supported by the pair of rails protruding from the pair of side walls.

[0010] In one or more embodiments, for example, the housing has a pair of rail receiving portions into which a pair of rails are slidably inserted. The pair of rails have deforming convex portions that protrude in the thickness direction. The deforming convex portions have a height that allows elastic deformation when the rails are inserted into the rail receiving portions. As a result, the rails are inserted into the rail receiving portions and the dust cover is slidably supported relative to the housing. The deforming convex portions provide appropriate movement resistance when the dust cover is attached or detached from the housing in the sliding direction. This prevents the dust cover from accidentally falling off and ensures ease of removal. The movement resistance of the dust cover is controlled by appropriately setting the height of the deforming convex portions.

[0011] In one or more embodiments, for example, the ridge-shaped portion may have deformed projections on both sides, which provides more appropriate resistance to movement when attaching or detaching the dust cover.

[0012] In one or more embodiments, for example, the housing has a pair of rail receiving portions that slidably hold a pair of rails, and one of the pair of rails and the pair of rail receiving portions has a protrusion, and the other has a recessed portion that slidably holds the protrusion. For example, the protrusion becomes thicker toward the tip in the protruding direction (corresponding to the "deep portion of the recessed portion"), and the recessed portion becomes wider toward the depth. This prevents the protrusion from disengaging from the recessed portion, thereby preventing unintended removal of the dust cover. The undercut shape may be set only on one of the recessed portion or the protrusion.

[0013] In one or more embodiments, the power tool is, for example, a portable processing machine. The portable processing machine has a spindle that is rotated by, for example, an electric motor and to which a disc-shaped cutting tool is attached. The portable processing machine has, for example, a forward / reverse switch that switches the rotation direction of the electric motor. This allows the direction of dust blowout to be reversed by switching the rotation direction of the disc-shaped cutting tool, thereby improving the working environment.

[0014] In one or more embodiments, for example, a power tool has a grip extending from a housing in a direction perpendicular to the motor shaft of the electric motor. For example, a start switch is provided on the grip. For example, a spindle is provided that is coaxial with the motor shaft, protrudes from one end of the housing, and is rotated by the electric motor. For example, a disk-shaped cutting tool is attached to the spindle. For example, an air intake is provided on the grip on the opposite side from the disk-shaped cutting tool. For example, a pair of rails extend so that the sliding direction for removing a dust cover is away from the disk-shaped cutting tool. This improves the dustproofness of the air intake and dust cover.

[0015] In one or more embodiments, the tool has a battery attachment portion at the end of the grip for attaching a battery pack that supplies power to the electric motor. This improves workability and ease of handling compared to AC-powered power tools that require a power cord. Attaching the battery pack to the grip on the opposite side of the tool from the work area ensures ease of use. [Example]

[0016] A power tool 1 according to this embodiment is shown in Figures 1 to 4. In this embodiment, the power tool 1 is a portable processing machine, also known as a compact cut-off tool. A portable processing machine is a type of tool that is used by supporting the entire mass of the product by hand and is used for cutting, chamfering corners, groove processing, and the like. Furthermore, a compact cut-off tool is a portable processing machine that uses a grinding stone or diamond wheel with a diameter of approximately 70 to 80 mm (3 inches: 75 mm is common on the market) as a cutting tool and switches the rotation direction of the cutting tool between forward and reverse depending on the application to cut metal or concrete. Switching the rotation direction can cause dust particles after cutting to invade the product, so improved dust prevention, particularly filter replacement performance, is required. In this embodiment, as shown in the figures, the longitudinal direction of the power tool 1 is defined as the front-to-rear direction, and the user side holding the tool is defined as the rear. The left-to-right direction is defined relative to the user.

[0017] The power tool 1 includes a tool body 10 having an electric motor 20 as a drive source housed in a cylindrical main housing 11, and a grip 40 that is held by a user. The main housing 11 has a structure split into upper and lower halves.

[0018] The electric motor 20 is a DC brushless motor having a rotor 22 on the inner periphery of a stator 21. The stator 21 is fixed along the inner periphery of the main body housing 11. A ring-shaped sensor board 27 is connected to the right side of the stator 21. The sensor board 27 detects information such as the rotational position of the rotor 22.

[0019] The rotor 22 is coupled to the motor shaft 23. The motor shaft 23 is rotatably supported on the main housing 11 via left and right bearings 24, 25. The rotor 22 is supported rotatably around the axis of the motor shaft 23 (motor axis J). The right end of the motor shaft 23 protrudes rightward from the inner periphery of the sensor board 27. The protruding portion is supported on the right side of the main housing 11 via the right bearing 25.

[0020] A cooling fan 26 is provided to the left of the rotor 22. The cooling fan 26 is connected to the motor shaft 23. When the electric motor 20 is started, the cooling fan 26 rotates integrally with the electric motor 20. The rotation of the cooling fan 26 introduces outside air into the main body housing 11. The introduced outside air cools the electric motor 20. The flow of the cooling air will be described later.

[0021] A spindle 30 is coaxially coupled to the left end of the motor shaft 23. The spindle 30 is rotatably supported on the main body housing 11 via a left-side bearing 24. The spindle 30, which is directly coupled to the motor shaft 23, rotates integrally with the motor shaft 23 around the motor axis line J.

[0022] The left side of the spindle 30 protrudes from the left side of the main body housing 11. A disk-shaped cutting tool 31 is attached to the protruding portion of the spindle 30. In this embodiment, a grinding stone with a relatively small diameter is used as the cutting tool 31. The cutting tool 31 is attached while being sandwiched between an outer flange 32 and an inner flange 33 in the direction of the motor axis J. The clamping force between the outer flange 32 and the inner flange 33 is generated by tightening a fixing screw 34 fastened to the left end face of the spindle 30. The cutting tool 31 rotates in the same direction and at the same speed as the electric motor 20.

[0023] The cutting tool 31 is covered with a cutting tool cover 35. The cutting tool cover 35 has a semicircular shape that covers roughly half the circumference of the cutting tool 31. The position of the cutting tool cover 35 around the motor axis J can be changed freely within a certain range. The cutting tool cover 35 mainly prevents dust such as cutting chips from scattering toward the user.

[0024] The rotation direction (forward / reverse) of the electric motor 20 can be switched by a forward / reverse switch 45, which will be described later. Switching the rotation direction of the electric motor 20 switches the rotation direction of the cutting tool 31. As shown in FIG. 2, an arrow indicating the rotation direction of the cutting tool 31 is displayed on the left side surface 35a of the cutting tool cover 35. An arrow 36 marked with the letter F (Forward) indicates the forward rotation direction (counterclockwise in FIG. 2). An arrow 37 marked with the letter R (Reverse) indicates the reverse rotation direction (clockwise in FIG. 2).

[0025] The direction in which dust scatters changes as the rotation direction of the cutting tool 31 changes. When switching the rotation direction of the cutting tool 31 to suit the working posture, etc., the scattering of dust toward the user can be efficiently suppressed by adjusting the position of the cutting tool cover 35 around the motor axis J.

[0026] As shown in Figure 1, a spindle lock button 28 is provided on the upper left surface of the tool body 10. When the spindle lock button 28 is pressed, a lock plate 29 shown in Figure 4 moves and engages with the two-face width portion 30a of the spindle 30. This locks the rotation of the spindle 30, facilitating the replacement of the cutting tool 31. When the pressing operation is released, the spindle lock button 28 and the lock plate 29 are urged by a spring to return to the unlock side, away from the two-face width portion 30a.

[0027] The grip 40 is provided so as to extend rearward from the main body housing 11 of the tool body 10. The grip housing 41, which forms the outer shell of the grip, has a left-right half-split structure in which a left half-housing 41L and a right half-housing 41R are butted together. The grip housing 41 is joined to the rear surface of the main body housing 11. Figure 2 shows the left half-housing 41L removed.

[0028] A start switch 42 is provided on the underside of the front of the grip 40. The start switch 42 is a trigger-type switch lever that is pulled with the fingertips of the hand holding the grip 40. A switch body 43 is mounted above the start switch 42. When the start switch 42 is pulled, the switch body 43 turns on and the electric motor 20 starts.

[0029] A lock-off button 44 is disposed in front of the switch body 43. The lock-off button 44 is a rod-shaped switch lever supported on the front of the grip housing 41 so that it can be moved left and right. When the protruding portion on one side (e.g., the left side) of the lock-off button 44 is pressed with a finger toward the other side (the unlock side, e.g., the right side), the lock state of the start switch 42 is released. In this case, a compression spring (not shown) is provided inside the grip 40, biasing the lock-off button 44 left and right. Therefore, when the finger is released from the pressed protruding portion, the biasing force of the compression spring automatically returns the lock-off button 44 to its original position. The lock mechanism operates in the same way even if the right protruding portion of the lock-off button 44 is pressed instead of the left protruding portion. When the start switch 42 is pulled with the lock-off button 44 in the unlocked state, the electric motor 20 is started. The lock-off button 44 may have a structure in which the protruding portion is provided only on one side (in most cases, the left side). The structure is the same as that of both sides except that the protruding portion is provided on one side.

[0030] When the start switch 42 is released from the depressed state, the lock-off button 44 returns to its original position, thereby locking the start switch 42 so that it cannot be depressed again. This prevents accidental start-up operations.

[0031] A protrusion 41a protruding upward in a mountain shape is provided on the front upper surface of the grip housing 41. The protrusion 41a functions as a stopper that restricts the forward position of the hand holding the grip 40. The forward / reverse selector switch 45 described above is disposed on the upper surface of the protrusion 41a. The forward / reverse selector switch 45 is a tumbler-type selector switch that is operated by tilting a lever left or right. The rotation direction of the electric motor 20 is switched by operating the forward / reverse selector switch 45 with a fingertip. By tilting the forward / reverse selector switch 45, for example, to the left, the cutting tool 31 rotates forward. By tilting the forward / reverse selector switch 45, for example, to the right, the cutting tool 31 rotates in the reverse direction.

[0032] A mounting base portion 41b that protrudes forward, backward, left, and right is integrally provided at the rear of the grip housing 41. A battery mounting portion 50 is provided on the mounting base portion 41b. A single slide-mounted battery pack 51 is attached to the battery mounting portion 50. As shown in FIG. 2, the battery pack 51 is attached by sliding it downward relative to the battery mounting portion 50. Conversely, the battery pack 51 is removed by sliding it upward relative to the battery mounting portion 50.

[0033] A flat controller 52 is disposed in front of the battery mounting portion 50. The controller 52 is configured by housing a control board 52b in a shallow rectangular case 52a and is insulated by a resin mold, and is housed inside the mounting base portion 41b along the extension direction of the mounting base portion 41b. The controller 52 is housed with the control board 52b (the opening side of the case 52a) facing forward.

[0034] The control board 52b of the controller 52 is equipped with a control circuit made up of a microcomputer that transmits control signals based on position information of the rotor 22 detected by the sensor board 27 of the electric motor 20. The control board 52b of the controller 52 also has a drive circuit made up of an FET that switches the current of the electric motor 20 based on the control signal received from the control circuit. The control board 52b of the controller 52 also has an auto-stop circuit and the like that cuts off the power supply to the electric motor 20 in response to the detection result of the state of the battery pack 51 to prevent over-discharge or over-current.

[0035] As described above, when the electric motor 20 in the tool body 10 is started, the cooling fan 26 rotates and introduces outside air into the main body housing 11. As shown in Figures 1, 3, 5 and 6, a flat base 11a is provided on the right rear surface of the main body housing 11, to the right of the protrusion 41a of the grip housing 41. The base 11a is provided with an air intake 12 for introducing outside air. As shown in Figures 5 and 6, the air intake 12 is divided by a plurality of ribs 12a and has left and right openings. toThe slits have a plurality of slits extending therethrough.

[0036] Outside air is drawn in from the right rear surface of the main housing 11 through the air intake 12 and flows leftward within the main housing 11. This primarily cools the stator 21, rotor 22, and sensor board 27. The motor cooling air that flows leftward within the main housing 11 is exhausted to the outside from an outlet that is opened in the main housing 11 below the cooling fan 26, for example.

[0037] One dust cover 15 is detachably attached to air intake port 12. Dust cover 15 is attached for the purpose of dust prevention, to reduce the inflow of dust particles and the like into air intake port 12. For this reason, dust cover 15 is removed and cleaned during maintenance.

[0038] As shown in FIG. 7, the dust cover 15 has a generally flat frame shape. The dust cover 15 has side walls 15a, 15b, and 15c at the top, bottom, and right edge. The three side walls 15a, 15b, and 15c protrude forward at the same height. The three side walls 15a, 15b, and 15c ensure high surface rigidity for the flat dust cover 15. A pair of rails 16 and 17 are integrally formed on the pair of opposing side walls 15a and 15b. The pair of rails 16 and 17 are formed in a ribbed shape, protruding from one side to the other in a direction approaching each other. In this embodiment, the rails 16 and 17 are an example of a ribbed shape.

[0039] The pair of rails 16, 17 extend elongatedly in the left-right direction. The pair of rails 16, 17 function as slide supports for mounting the slides. Four deforming protrusions 16a, 16b, 17a, 17b are integrally formed on each of the upper and lower rails 16, 17. Two deforming protrusions 16a are provided on the front surface of the upper rail 16 at a fixed interval on the left and right. Although not visible in Figure 7, two deforming protrusions 16b are provided on the rear surface of the upper rail 16 at the same interval as on the front side. The deforming protrusions 16a on the front side and the deforming protrusions 16b on the rear side are provided back-to-back.

[0040] Two deforming protrusions 17a are provided on the left and right at a fixed distance apart on the front surface of the lower rail 17. Two deforming protrusions 17b are provided on the rear surface of the lower rail 17 at the same distance as on the front surface. The deforming protrusions 17a on the front surface and the deforming protrusions 17b on the rear surface are provided back to back.

[0041] As shown in Figure 9, the upper rail 16 has an undercut shape in which the thickness t gradually increases toward the protruding tip (lower side). The front surface of the front-side deforming convex portion 16a and the rear surface of the rear-side deforming convex portion 16b are approximately parallel. Therefore, the heights ha and hb of the front and rear deforming convex portions 16a and 16b from the front and rear surfaces of the rail 16 gradually increase toward the protruding base (upper side) of the rail 16.

[0042] Like the upper rail 16, the lower rail 17 also has an undercut shape. The front and rear deforming protrusions 17a, 17b are gradually raised toward the base of the protrusion of the rail 17. Therefore, like the upper deforming protrusions 16a, 16b, the front surface of the front deforming protrusion 17a and the rear surface of the rear deforming protrusion 17b are substantially parallel.

[0043] An opening 15d is provided in the bottom (rear) surface of dust cover 15. A wire mesh filter 18 is attached to opening 15d. Outside air passes through filter 18 and is introduced into intake port 12. This protects intake port 12 from dust.

[0044] As shown in Figures 6, 11, and 13, a pair of upper and lower rail receiving portions 13, 14 are provided on the upper and lower surfaces of the base portion 11a. The rail receiving portions 13, 14 have a concave stripe shape (groove shape) extending parallel to each other from the right surface of the base portion 11a to the left. The rail receiving portions 13, 14 in this embodiment are an example of a concave stripe shape. The rail receiving portions 13, 14 penetrate the side portions on the upper surface and the side portions on the lower surface of the base portion 11a in the thickness direction. The thickness direction of the upper and lower sides corresponds to the depth direction of the rail receiving portions 13, 14. In the depth direction, the inner side of the base portion 11a corresponds to the deep side (conversely, the outer side corresponds to the shallow side). The rail receiving portions 13, 14 function as rail receiving portions into which rails 16, 17 of the dust cover 15 are inserted.

[0045] 11 to 14, the groove width d of the upper and lower rail receiving portions 13, 14 becomes wider as it goes toward the inside of the base portion 11a (deeper portions of the rail receiving portions 13, 14). The rails 16, 17 of the dust cover 15 become thicker as they go from the base toward the tip (deeper portions of the rail receiving portions 13, 14). Therefore, the upper and lower rail receiving portions 13, 14 have an undercut shape that matches the rails 16, 17 of the dust cover 15.

[0046] The groove width d of the upper and lower rail receiving portions 13 and 14 is larger than the thickness t of the upper and lower rails 16 and 17, and is smaller than the thickness T between the deforming convex portions 16a and 16b and the thickness T between the deforming convex portions 17a and 17b. The deforming convex portions 16a, 16b, 17a, and 17b, which are arranged locally (discontinuously in the extension direction) on the rails 16 and 17, provide an appropriate sliding resistance to the rail receiving portions 13 and 14.

[0047] As shown in FIG. 6, the dust cover 15 can be attached to a position covering the air intake 12 by inserting the upper and lower rails 16 and 17 into the upper and lower rail receiving portions 13 and 14, respectively, with the right side wall portion 15c positioned to the right, and then sliding the dust cover 15 to the left relative to the base portion 11a.

[0048] 11 and 12, when the rails 16, 17 enter the upper and lower rail receiving portions 13, 14, the deforming convex portions 16a, 16b, 17a, 17b are elastically deformed and crushed. The crushed deforming convex portions 16a, 16b, 17a, 17b provide sliding resistance, thereby maintaining the attached state of the dust cover 15. This prevents the dust cover 15 from accidentally falling off the base portion 11a.

[0049] 5, 11, and 13 show the attached state of dust cover 15. When dust cover 15 is attached to base portion 11a, the rear of intake port 12 is covered with filter 18. This prevents dust from entering main body housing 11 through intake port 12.

[0050] When the dust cover 15 is attached, the upper rail 16 is inserted into the upper rail receiving portion 13, and the lower rail 17 is inserted into the lower rail receiving portion 14. The undercut-shaped rails 16, 17 are inserted into the undercut-shaped rail receiving portions 13, 14, restricting the relative displacement of the rails 16, 17 in the direction of slippage relative to the depth direction of the rail receiving portions 13, 14 (a direction intersecting the sliding direction). This more firmly holds the dust cover 15 in an attached state. For example, even if a rearward external force indicated by the white arrow P in FIG. 5 is applied to the upper side wall portion 15a of the dust cover 15, causing the upper rail 16 to come off the rail receiving portion 13, the rail 17 is prevented from slipping off the lower rail receiving portion 14. This prevents the dust cover 15 from coming off the base portion 11a.

[0051] Dust cover 15 can be smoothly removed by pinching the space between upper and lower side walls 15a, 15b with your fingertips and sliding dust cover 15 to the right, as shown in Figure 6. Deformed protrusions 16a, 16b, 17a, 17b that provide sliding resistance are arranged locally, rather than along the entire extension of rails 16, 17. This allows dust cover 15 to slide in the removal direction with just the right amount of sliding resistance.

[0052] According to the embodiment described above, the flat dust cover 15 can be attached to and detached from the base portion 11a of the main body housing 11 by sliding it left and right (in the plane direction). This allows the dust cover 15 to be easily removed without the need to remove the tabs or elastically deform the entire cover, as in the conventional case.

[0053] According to the illustrated embodiment, when the dust cover 15 is attached, the deforming protrusions 16a, 16b, 17a, and 17b of the rails 16 and 17 elastically deform and compress, providing appropriate resistance to movement when the dust cover 15 slides relative to the base 11a of the main body housing 11. This prevents the dust cover 15 from accidentally falling off and ensures ease of removal. The resistance to movement of the dust cover 15 is controlled by appropriately setting the heights of the deforming protrusions 16a, 16b, 17a, and 17b. The resistance to movement can also be controlled by increasing or decreasing the number of positions (locations) of the deforming protrusions 16a, 16b, 17a, and 17b. For example, one or more deforming protrusions may be arranged on one or both sides of the rails 16 and 17.

[0054] According to the illustrated embodiment, the rails 16, 17 and the rail receiving portions 13, 14 each have an undercut shape. That is, the rails 16, 17 have a thickness t that increases toward the bottom of the rail receiving portions 13, 14, and the rail receiving portions 13, 14 have a groove width d that increases toward the bottom. This prevents the rails 16, 17 from slipping out of the rail receiving portions 13, 14 in a direction perpendicular to the sliding direction, thereby preventing unintended and careless removal (falling off) of the dust cover 15. The undercut shape may be formed only on either the rail receiving portions or the rails.

[0055] According to the illustrated embodiment, the power tool 1 is a handheld portable processing machine and has a forward / reverse switch 45 for switching the rotation direction of the electric motor 20. This allows the direction of dust blowout to be reversed by switching the rotation direction of the cutting tool 31, thereby maintaining a good working environment.

[0056] According to the illustrated embodiment, the intake port 12 is provided on the opposite side of the grip 40 from the cutting tool 31. This positions the intake port 12 away from the dust-generating area, thereby improving the dustproofness of the intake port 12 and the dust cover. Moreover, the sliding direction for removing the dust cover 15 is set in the direction away from the cutting tool 31 (to the right). This also improves the dustproofness of the intake port 12 and the dust cover.

[0057] According to the illustrated embodiment, the rear of the grip 40 has a battery mounting portion 50 for mounting a battery pack 51 that supplies power to the electric motor 20. The cordless power tool 1 improves workability and ease of handling compared to AC power tools that require a power cord to be connected. Workability is ensured by mounting the battery pack 51 on the opposite side of the grip 40 (holding portion) from the processing area.

[0058] The above-described embodiment can be modified in various ways. For example, a concave rail may be provided on the dust cover side, and a protruding rail receiving portion may be provided on the base portion 11a side.

[0059] The deforming convex portion may be provided on the rail side as illustrated, or may be provided on the rail receiving portion, or on both.

[0060] The undercut shape (change in thickness t) of the rails 16, 17 and the undercut shape (change in groove width d) of the rail receiving portions 13, 14 may be set on only one side, or both may be omitted.

[0061] Although the dust cover 15 is detachably attached by sliding it in the left-right direction in the illustrated example, it may be detachably attached by sliding it up and down relative to the base portion 11a. The location where the dust cover 15 is attached is not limited to the rear right surface of the tool body 10 as illustrated, but may be changed to the front right surface, upper right surface, lower right surface, or right surface.

[0062] The cutting tool 31 is not limited to a grindstone, and may be, for example, a diamond wheel. Although a cutting tool that rotates a disc-shaped cutting tool 31 to cut a material has been exemplified as the power tool 1, the exemplified dust cover can also be applied to a drilling tool or a screw tightening tool that rotates a bit. The exemplified slidable dust cover can also be applied to a handheld rotary tool that has an electric motor built into the grip and rotates a spindle about an axis perpendicular to the motor axis J.

[0063] The power tool 1 of the embodiment is an example of a power tool according to one aspect of the present disclosure. The main body housing 11 of the embodiment is an example of a housing according to one aspect of the present disclosure. The air intake 12 of the embodiment is an example of an air intake according to one aspect of the present disclosure. The dust cover 15 of the embodiment is an example of a dust cover according to one aspect of the present disclosure. The rails 16 and 17 of the embodiment are an example of a pair of rails according to one aspect of the present disclosure. [Explanation of symbols]

[0064] 1...Power tool (compact cut-off tool) 10...Tool body 11...Main body housing 11a...Base 12...Air intake 12a...Rib 13...Rail support part (upper side) 14...Rail support part (lower side) d... Groove width of rail receiving portions 13, 14 15...Dust cover 15a...Side wall part (upper side) 15b...Side wall part (lower side), 15c...Side wall part (right side) 15d…Aperture 16...Rail (upper) 16a...deformed convex portion (front side), 16b...deformed convex portion (rear side) 17...Rail (lower) 17a... Deformed convex portion (front side), 17b... Deformed convex portion (rear side) t...thickness of rails 16 and 17 18...Filter P...External force applied to the dust cover 15 20...Electric motor 21...Stator 22...Rotor 23...Motor shaft J: Motor axis 24,25...Bearings 26...Cooling fan 27...Sensor board 28...Spindle lock button 29...lock plate 30...Spindle 30a…Width across flats part 31...cutting tool 32...Outer flange 33...Inner flange 34...Fixing screw 35...Cutting tool cover 35a…Left side 36...Arrow (forward direction) 37...Arrow (reverse direction) 40...Grip 41...Grip housing 41L...Half housing (left side) 41R...Half housing (right side) 41a...protrusion, 41b...mounting base 42...Start switch 43...Switch body 44...Lock-off button 45...Forward / reverse switch 50...Battery mounting section 51...Battery pack 52...Controller 52a...case, 52b...control board

Claims

1. A power tool, a housing that houses the electric motor; a grip extending from the housing in a direction perpendicular to a motor shaft of the electric motor; a start switch provided on the grip; a spindle that is coaxial with the motor shaft, protrudes from one end of the housing, has a disk-shaped cutting tool attached thereto, and is rotated by the electric motor; a base portion provided on the housing on the opposite side of the grip from the disk-shaped cutting tool; an air intake port provided in the base portion to introduce outside air into the housing; a flat dust cover having a filter covering the air intake port; the intake port is provided on the opposite side of the grip from the disk-shaped cutting tool, The dust cover is detachably disposed so as to cover the intake port, The base portion, the air intake port, and the dust cover are arranged along the extension direction of the grip, and the air intake port is partitioned by a plurality of ribs and has a plurality of slit shapes extending in a direction perpendicular to the extension direction of the grip.

2. The power tool according to claim 1, a pair of rails provided on the dust cover along both edges of the intake port; The dust cover is slid along the surface of the pair of rails to be attached to and detached from the housing.

3. The power tool according to claim 2, The dust cover has a pair of opposing side walls arranged along both edges of the air intake port, and the pair of rails each protrude in a ridge-like shape from one of the pair of side walls to the other.

4. The power tool according to claim 3, The housing has a pair of concave rail receiving portions into which the pair of rails are slidably inserted, and the pair of rails have deforming convex portions that protrude in the thickness direction, and the deforming convex portions have a height that allows them to elastically deform when the rails are inserted into the rail receiving portions.

5. The power tool according to claim 4, The power tool has the deformed convex portion on both sides of the ridge shape.

6. The power tool according to any one of claims 2 to 4, the housing has a pair of rail receiving portions that slidably hold the pair of rails, One of the pair of rails and the pair of rail receiving portions has a protrusion, and the other has a recess that slidably holds the protrusion, The thickness of the protrusion increases as it goes deeper into the recessed stripe, The recessed stripe shape has a width that increases as it goes deeper into the power tool.

7. The power tool according to any one of claims 2 to 6, The power tool is a portable processing machine, The portable processing machine includes a spindle that is rotated by the electric motor and to which a disc-shaped cutting tool is attached; The electric tool has a forward / reverse switch for switching the rotation direction of the electric motor.

8. The power tool according to any one of claims 2 to 7, The pair of rails extend in a sliding direction for removing the dust cover so as to move the dust cover away from the disk-shaped cutting tool.

9. The power tool according to claim 8, The power tool has a battery mounting portion at an end of the grip for mounting a battery pack that supplies power to the electric motor.

10. A power tool, a housing that houses the electric motor; an air intake provided in the housing to introduce outside air into the housing; a flat dust cover having a filter that covers the air intake; a pair of rails provided on the dust cover along both edges of the intake port; The dust cover is slid in a surface direction by the pair of rails to be attached to and detached from the housing, the dust cover has a pair of opposing side walls provided along both edges of the air intake port, and the pair of rails each protrude in a ridge-like shape from one of the pair of side walls to the other; the housing has a pair of recessed rail receiving portions into which the pair of rails are slidably inserted, The pair of rails have deformed convex portions that protrude in a thickness direction, The deforming convex portions are locally arranged at a plurality of locations in the extending direction of the rail, A power tool in which the groove width of the rail receiving portion is larger than the thickness of the pair of rails and smaller than the thickness of the deforming convex portion, and the deforming convex portion elastically deforms when the rails are inserted into the rail receiving portion.

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