Operating machinery

Abstract

The present invention provides a working machine that can improve heat resistance. The dust box includes the following components: a box inlet portion, which allows air flow to flow into the dust collecting chamber; and a box side exhaust port, which allows the air flow in the dust collecting chamber to be exhausted to the outside of the dust collecting chamber, and the box side exhaust port is arranged on the rear side of the box inlet portion. In addition, the dust box has a casing guide portion that guides the air flow flowing into the dust collecting chamber to the lower side. Therefore, the air flow flowing into the dust collecting chamber flows to the lower side at the front end of the dust collecting chamber, flows to the rear side at the lower end of the dust collecting chamber, and flows to the upper side at the rear end of the dust collecting chamber. That is, the air flow can be made to flow in the substantially entire dust collecting chamber. Thereby, the resin outer casing constituting the dust collecting chamber can be efficiently cooled.

Description

Technical Field

[0001] The invention relates to a working machine. Background Art

[0002] Patent Document 1 below describes a portable circular saw (working machine) including a dust box. The dust box is disposed on the side of a saw cover covering a circular saw blade, and is configured to store chips generated when the portable circular saw is operated in the dust box.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2011-68073 Summary of the invention

[0006] Problems to be solved by the invention

[0007] Here, when the workpiece processed by the portable circular saw is a metal such as mild steel, the temperature of the chips generated during the cutting process is relatively high. Therefore, when the chips come into contact with a part of the portable circular saw, there is a risk that the heat of the chips will affect the contacting part, for example, the saw cover or the dust box may be thermally deformed by the chips. Therefore, in the working machine, it is desirable to form a structure that can improve heat resistance.

[0008] In view of the above facts, an object of the present invention is to provide a working machine having improved heat resistance.

[0009] Technical means of solving problems

[0010] One or more embodiments of the present invention are a working machine, comprising: a motor, driving a top tool for cutting a workpiece forward; a tool cover, covering at least a portion of the top tool; and a dust box, connected to the tool cover, the dust box comprising: an air intake section, allowing the air generated by the drive or cutting process of the motor to flow into the interior of the dust box; and an exhaust section, allowing the air flowing into the dust box to be exhausted to the outside of the dust box, the air intake section and the exhaust section are separated in the front-to-back direction, and the air path connecting the air intake section and the exhaust section is formed in the dust box in a manner extending in the front-to-back direction.

[0011] One or more embodiments of the present invention are a working machine, wherein the air intake portion is arranged at the front of the dust box, and the exhaust portion is arranged at the rear of the dust box. One or more embodiments of the present invention are a working machine, wherein the exhaust portion and the air intake portion are arranged at the same position in the up-down direction.

[0012] One or more embodiments of the present invention are a working machine having a fan, which is driven by the motor to rotate and generate the air flow. The tool cover has an air supply part connected to the air intake part, and the air flow generated by the fan is transported to the air intake part by the air supply part.

[0013] One or more embodiments of the present invention are a working machine, comprising: a motor, which drives a top tool for cutting a workpiece forward; a fan, which is rotated by the drive of the motor and generates an air flow; a tool cover, which covers at least a portion of the top tool; and a dust box, which is connected to the tool cover; an air supply unit is provided on the tool cover, and the air supply unit conveys the air flow generated by the fan to the dust box, and the dust box has: a resin casing, which has a dust collecting chamber inside for collecting processed pieces generated during cutting; an air intake unit, which is connected to the air supply unit and allows the air flow to flow into the dust collecting chamber; and an exhaust unit, which allows the air flow flowing into the dust collecting chamber to be exhausted to the inside of the tool cover, wherein the working machine has an air path, and the air path is configured to allow the air flow generated by the fan to flow into the dust collecting box via the air intake unit, and to be exhausted to the inside of the tool cover from the exhaust unit.

[0014] A working machine, wherein the air supply unit comprises: a first air supply outlet unit for causing the air that does not contain the processed piece to flow out toward the air intake unit; and a second air supply outlet unit for causing the air that contains the processed piece to flow out toward the air intake unit.

[0015] One or more embodiments of the present invention are a working machine, wherein the first air supply outlet portion and the second air supply outlet portion are arranged adjacent to each other. One or more embodiments of the present invention are a working machine, wherein the first air supply outlet portion and the second air supply outlet portion open in the same direction. One or more embodiments of the present invention are a working machine, wherein the first air supply outlet portion is arranged on the upper side of the second air supply outlet portion, and the air flow flowing out from the first air supply outlet portion to the air intake portion is guided downward by the guide portion.

[0016] One or more embodiments of the present invention are a working machine, wherein the second air supply outlet is connected to the interior of the tool cover, and the air supply section includes a duct for diverting the air flow, and the duct has: a first duct exhaust section for exhausting one of the diverted air flows toward the first air supply outlet; and a second duct exhaust section for exhausting the other diverted air flow toward the interior of the tool cover, and the other diverted air flow is exhausted toward the second air supply outlet by the second duct exhaust section. One or more embodiments of the present invention are a working machine, wherein the top tool is a circular saw blade, and when viewed from the plate thickness direction of the circular saw blade, the second duct exhaust section is arranged radially inward of the outer shape of the circular saw blade.

[0017] One or more embodiments of the present invention are a working machine, wherein a first rectifying section is provided between the second air supply outlet section and the second duct exhaust section, and the first rectifying section rectifying the air flow exhausted from the second duct exhaust section toward the second air supply outlet section.

[0018] One or more embodiments of the present invention provide a working machine, wherein the second air supply outlet portion includes a second rectifying portion that rectify the air flow flowing into the second air supply outlet portion toward the dust box side.

[0019] One or more embodiments of the present invention provide a working machine, wherein the guide portion constitutes a portion of an inner peripheral surface of the dust collecting chamber.

[0020] One or more embodiments of the present invention are a working machine, wherein the top tool is a circular saw blade, the tool cover is configured to cover the upper portion of the circular saw blade, and the dust collecting chamber is set smaller in the vertical direction than in the front-rear direction.

[0021] One or more embodiments of the present invention are a working machine, comprising: a motor, which drives a top tool for cutting a workpiece; a fan, which rotates and generates an air flow when driven by the motor; a tool cover, which covers at least a portion of the top tool; and a dust box, which is arranged adjacent to the tool cover, and the dust box includes the following components: a resin casing, which has a dust chamber inside for collecting processed pieces generated during the cutting process; an air intake section, which allows the air flow to flow into the dust chamber; an exhaust section, which is separated from the air intake section in the front-to-back direction and allows the air flow flowing into the dust chamber to be exhausted to the outside of the dust chamber; and a guide section, which guides the air flow flowing from the air intake section to the dust chamber toward the lower side.

[0022] One or more embodiments of the present invention are a working machine, wherein the top tool is a circular saw blade, the air intake portion is located further forward than the rotation center of the circular saw blade, and the exhaust portion is located further rearward than the rotation center of the circular saw blade.

[0023] One or more embodiments of the present invention are a working machine, wherein the air intake portion is located further back than the front end of the circular saw blade, and the exhaust portion is located further forward than the rear end of the circular saw blade. One or more embodiments of the present invention are a working machine, wherein a base for sliding on the workpiece is provided below the tool cover, and the dust box is installed on one side of the tool cover in the left and right directions.

[0024] One or more embodiments of the present invention are a working machine, comprising: a motor, driving a top tool for cutting a workpiece forward; a tool cover, covering at least a portion of the top tool; and a dust box, connected to one of the left and right sides of the tool cover, the dust box having: a housing, having a dust chamber inside for collecting the processed pieces generated during the cutting process; an air intake, connected to the air supply section and allowing air to flow into the dust chamber; and an exhaust section, allowing the air flowing into the dust chamber to be exhausted to the inside of the tool cover, the working machine having an air path, the air path being configured to allow the air to flow into the dust box via the air intake section, and being exhausted from the exhaust section to the inside of the tool cover. One or more embodiments of the present invention are a working machine, configured such that the air flow is rectified by the inner wall of the dust chamber by cooling the inner wall of the dust chamber, and is directed toward the exhaust section. One or more embodiments of the present invention are a working machine, comprising: a motor, which drives a top tool for cutting a workpiece; a tool cover, which has a tool housing area for housing at least a portion of the top tool; a dust box, which has a dust chamber, an air intake section and an exhaust section, wherein the dust chamber is connected to the tool cover and collects the processed pieces generated during the cutting process, the air intake section allows air to flow into the dust chamber, and the exhaust section allows the air flowing into the dust chamber to be exhausted to the outside of the dust chamber; and a shielding section, which is arranged in the tool housing area and divides the tool housing area into a working area and a non-working area, wherein a portion of the top tool is housed in the working area, and the exhaust section is connected to the non-working area.

[0025] Effects of the Invention

[0026] According to one or more embodiments of the present invention, heat resistance can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1It is a side view showing the cutting tool of this embodiment when viewed from the right side.

[0028] Figure 2 yes Figure 1 The cut-off tool is shown in a side view as seen from the left side.

[0029] Figure 3 yes Figure 1 The cutting tool shown is a perspective view when viewed from the right side obliquely from the front.

[0030] Figure 4 It means that Figure 3 The cut-off tool shown is a perspective view of a state in which a dust box is removed from a tool body, when viewed from the right oblique front.

[0031] Figure 5 Yes means Figure 2 A cross-sectional view of the interior of the cutting tool shown, as viewed from above ( Figure 2 5-5 line profile).

[0032] Figure 6 (A) is Figure 5 The side view of the pipe shown is viewed from the right side. Figure 6 (B) is Figure 6 (A) is a front view of the pipeline when viewed from the front side, Figure 6 (C) is Figure 6 (A) is a side view of the pipeline when viewed from the left side.

[0033] Figure 7 Yes means Figure 4 A perspective view showing the positional relationship between a saw cover and a circular saw blade of a cutting tool when viewed from the oblique front left.

[0034] Figure 8 Yes means Figure 5 A cross-sectional view of the interior of the tool cover as viewed from the left side ( Figure 5 8-8 line cross section).

[0035] Fig. 9 (A) is Figure 1 A cross-sectional view of the dust box assembly and disassembly button portion as viewed from the front side ( Figure 1 9A-9A line cross-section diagram), Fig. 9 (B) is viewed from the upper front. Fig.12 The cross-sectional view of the interior of the lower air outlet portion of the saw cover shown in FIG. Fig.12 9B-9B line cross-section diagram).

[0036] Fig.10 (A) is Figure 1 A cross-sectional view of the front end of the dust box shown in FIG. Figure 1 10A-10A line cross-section diagram), Fig.10 (B) is Figure 1 A cross-sectional view of the front end portion of the dust box shown in FIG. Figure 1 10B-10B line cross-section diagram).

[0037] Fig.11 yes Figure 4 The dust box shown is an exploded perspective view when viewed from the left rear obliquely.

[0038] Fig.12 Yes means Fig.11 A side view showing the positional relationship between the inner casing of the dust box and the saw cover when viewed from the right side.

[0039] Explanation of symbols

[0040] 10: Cutting tools (working machinery)

[0041] 12: Tool body

[0042] 14: Base

[0043] 14A: Tool insertion part

[0044] 16: Circular saw (top tool)

[0045] 20: Shell

[0046] 22: Main body shell

[0047] 22A: Cover base

[0048] 22B: Air Inlet

[0049] 22C: Opening

[0050] 22D: Lower rectifier (first rectifier section)

[0051] 22E: Restricted Department

[0052] 24: Handle housing

[0053] 24A: Handle

[0054] 24B: Battery installation department

[0055] 26: Pipeline

[0056] 26A: Inflow pipe section

[0057] 26B: Outflow pipe

[0058] 26C: First pipe exhaust

[0059] 26D: Second pipe exhaust section

[0060] 27: Pipeline body

[0061] 28: Duct cover

[0062] 30: Trigger

[0063] 31: Lock button

[0064] 40: Driving mechanism

[0065] 41: Motor

[0066] 42: Rotation axis

[0067] 42A: Small gear

[0068] 43: Rotor

[0069] 44: Stator

[0070] 44A: Stator holder

[0071] 45: Motor substrate

[0072] 46: Fan

[0073] 47: First motor bearing

[0074] 48: Second motor bearing

[0075] 50: Output shaft

[0076] 52: Washer

[0077] 54: Protective cover

[0078] 54A: Peripheral protection unit

[0079] 54B: First side protection portion

[0080] 54C: Second side protection part

[0081] 56: Control Department

[0082] 58: Battery Pack

[0083] 60: Saw cover

[0084] 61: Side cover

[0085] 61A: Cover side cutout

[0086] 61B: Connecting hole

[0087] 61C: Button insert

[0088] 61D: Fixing hole

[0089] 62: Peripheral cover part

[0090] 63: Shelter

[0091] 63A: air supply guide (second rectifying section)

[0092] 63B: Left end

[0093] 63C: Front

[0094] 63D: Rear

[0095] 64: Lower air supply outlet (second air supply outlet)

[0096] 64A: Upper rectifying segment (first rectifying section)

[0097] 64B: Slit

[0098] 64C: Exit hole

[0099] 64D: Groove

[0100] 65: Upper air supply outlet (first air supply outlet)

[0101] 68: Protective components

[0102] 68A: Guard fixing part

[0103] 70: Tool cover

[0104] 70A: Tool Containment Area

[0105] 70B: Working area

[0106] 70C: Non-working area

[0107] 80: Dust box

[0108] 80A: Dust chamber

[0109] 82: Outer casing (casing)

[0110] 82A: Box side snap hook

[0111] 82B: Casing guide (guide)

[0112] 82C: Fixed boss

[0113] 82D: Button storage part

[0114] 82E: Stop rib

[0115] 82F: Inclined part of the casing

[0116] 82G: Installation Department

[0117] 82H: discharge hole

[0118] 84: Inner casing

[0119] 84A: Fixing hole

[0120] 84B: Box inlet (air intake)

[0121] 84C: Stop wall

[0122] 84D: Button insertion slot

[0123] 84E: Box side exhaust port (exhaust part)

[0124] 84F: Bottom of the box

[0125] 84G: Inclined part

[0126] 86: Loading and unloading button

[0127] 86A: Engagement protrusion

[0128] 86B: Button snap-on piece

[0129] 86C: Engaged hook

[0130] 88: Button spring

[0131] 90: Dust collector connection

[0132] 90A: Installation part

[0133] 90B: Connecting tube

[0134] 92: Hat

[0135] AR1, AR2, AR3, AR4: Air flow

[0136] BL: Bolt

[0137] SC: Fixing screw

[0138] A, UP, FR, RH: Arrow DETAILED DESCRIPTION

[0139] Hereinafter, the cutting tool 10 as the working machine of the present embodiment will be described using the drawings. In addition, in the drawings, arrows UP, FR, and RH shown as appropriate respectively indicate the upper side, the front side, and the right side of the cutting tool 10. Moreover, in the following description, when the up-down, front-back, and left-right directions are used for description, unless otherwise specified, the up-down direction, the front-back direction, and the left-right direction of the cutting tool 10 are indicated.

[0140] The cutting tool 10 is configured as a tool for cutting a workpiece. Figure 1 to Figure 4As shown, the cutting tool 10 is composed of the following components: a tool body 12 for cutting a workpiece; and a dust box 80 for storing chips generated during the processing. The structure of the tool body 12 will be described first, and then the structure of the dust box 80 will be described.

[0141] (Tool Body 12 ) The tool body 12 includes the base 14 , the housing 20 , the drive mechanism 40 and the control unit 56 accommodated in the housing 20 , the battery pack 58 , the saw cover 60 , and the guard member 68 .

[0142] (Regarding the base 14) The base 14 is formed into a substantially rectangular plate shape with the vertical direction being the plate thickness direction and the front-rear direction being the length direction. When the cutting tool 10 is used for processing, the base 14 is placed on the upper side of the workpiece, and the cutting tool 10 is moved forward, so that the lower surface of the base 14 slides on the upper surface of the workpiece.

[0143] On the left side of the base 14, a tool insertion portion 14A for arranging a circular saw blade 16 as a top tool is formed through, and the tool insertion portion 14A is formed into a roughly rectangular hole shape with the front-to-back direction as the length direction when viewed from above. Here, the circular saw blade 16 is formed into a roughly circular plate shape with the left-to-right direction as the plate thickness direction, and the center portion of the circular saw blade 16 is fixed to the output shaft 50 in a manner that allows it to rotate integrally with the output shaft 50 of the drive mechanism 40 described later. Moreover, the circular saw blade 16 is arranged in the tool insertion portion 14A, and the upper portion of the circular saw blade 16 protrudes upward from the base 14, and the lower end side portion of the circular saw blade 16 protrudes downward from the base 14. In addition, it is constructed so that when the cutting tool 10 is working, the circular saw blade 16 rotates around the axis of the output shaft 50 to one side of the rotation direction ( Figure 1 Rotates in the direction of arrow A (hereinafter referred to as the cutting rotation direction).

[0144] (Regarding the housing 20) Figure 1 to Figure 5 As shown, the housing 20 forms the outer shell of the tool body 12 and is disposed above the base 14. The housing 20 includes a main body housing 22 that accommodates a drive mechanism 40 described later, a handle housing 24 that forms the upper portion of the housing 20, and a pipe 26.

[0145] The main body shell 22 is formed into a bottomed cylindrical shape that is open to the right. A cover base portion 22A that protrudes radially outward is formed at the right end of the main body shell 22. The cover base portion 22A is formed into a substantially semicircular shape that protrudes upward when viewed from the right, and the outer periphery of the cover base portion 22A is bent to the left (see FIG. Figure 5 ). Moreover, the front end and the rear end of the cover base portion 22A are connected to the base 14. The cover base portion 22A is made of metal, and has higher heat resistance and wear resistance than resin materials.

[0146] At the left end of the main body housing 22, a plurality of air inlets 22B are formed through the front and rear corners. The plurality of air inlets 22B are formed from the bottom wall (left end) of the main body housing 22 to the front and rear side walls, and are arranged at predetermined intervals in the vertical direction. At the front wall of the right end of the main body housing 22, an opening 22C (see FIG. 22C ) is formed through the front wall, which is open to the front side, except for the cover base 22A. Figure 3 to Figure 5 ), the opening portion 22C is formed into a roughly rectangular shape when viewed from the front side.

[0147] In addition, on the right side surface of the cover base portion 22A, a lower side rectifying piece 22D (see Figure 5 and Figure 8 The lower side straightening piece 22D extends in the up-down direction with the front-to-back direction being the plate thickness direction, and is arranged between the circular saw blade 16 and the cover base portion 22A.

[0148] The handle housing 24 is formed in a substantially D-shape which is hollow when viewed from the left side, and is arranged so as to cover the main body housing 22 from the upper side and the rear side, and is connected to the main body housing 22. The upper end of the handle housing 24 is configured as a handle portion 24A for the operator to hold, and the handle portion 24A is inclined downward toward the rear side when viewed from the side.

[0149] A trigger 30 is provided at the front end side portion of the handle portion 24A. The trigger 30 protrudes downward from the handle portion 24A and is configured to be operated to be pulled upward. In addition, a lock button 31 for locking the pulling operation of the trigger 30 is provided on the handle portion 24A, on the upper side of the trigger 30. Furthermore, a switch mechanism (not shown) is provided inside the handle portion 24A. The switch mechanism has a switch (not shown) operated by the trigger 30. The switch is electrically connected to the control portion 56 described later, and is configured to output an output signal corresponding to the operation state of the trigger 30 to the control portion 56.

[0150] The rear lower end of the handle housing 24 is configured as a battery mounting portion 24B for mounting a battery pack 58 described later. A connector (not shown) is provided in the battery mounting portion 24B, and the connector is electrically connected to a control unit 56 described later.

[0151] (Regarding pipeline 26) Figure 2 to Figure 6As shown, the duct 26 is disposed adjacent to the left side of the cover base portion 22A and is installed on the cover base portion 22A, and is configured as an air supply duct that conveys the air flow AR1 generated by the fan 46 described later to the dust box 80. The duct 26 is composed of two components, namely, a duct body 27 and a duct cover 28, and the duct 26 is configured by assembling the duct cover 28 to the duct body 27. The duct cover 28 is a part installed in a manner covering the left side of the circular saw blade 16, but since it is formed of a transparent material, the operator can visually inspect the front end (cutting portion) of the circular saw blade 16 from the left side through a part of the duct cover 28.

[0152] The duct 26 includes an inflow duct portion 26A constituting the left portion of the duct 26 and an outflow duct portion 26B constituting the right portion of the duct 26. The inflow duct portion 26A is formed into a substantially rectangular cylindrical shape with the left-right direction as the axial direction. The inflow duct portion 26A is arranged inside the main body case 22 at the opening portion 22C of the main body case 22, and the front wall of the inflow duct portion 26A closes the opening portion 22C (see Figure 5 ). In addition, the front wall and the upper and lower walls of the left end portion of the inflow duct portion 26A are cut, and the interior of the inflow duct portion 26A is connected to the interior of the main body case 22.

[0153] The outflow duct portion 26B is formed into a generally rectangular cylindrical shape with the vertical direction as the axial direction, and the right end portion of the inflow duct portion 26A is connected to the middle portion of the outflow duct portion 26B in the vertical direction. A first duct exhaust portion 26C is formed at the upper end portion of the outflow duct portion 26B. The first duct exhaust portion 26C is formed into a generally U-shape that is open to the right when viewed from the length direction of the outflow duct portion 26B, and is bent to the right along the outer periphery of the cover base portion 22A. As a result, a portion of the air flow AR1 that flows into the inflow duct portion 26A is blown out to the right from the first duct exhaust portion 26C (see Fig.10 (A) and Fig.10 (B)).

[0154] In addition, if Fig.10 As shown in (A), a second duct exhaust portion 26D protruding forward and in a cylindrical shape is formed at the lower end of the outflow duct portion 26B. The second duct exhaust portion 26D is bent to the right and is arranged in a manner that straddles the lower side of the front end portion of the cover base portion 22A. Moreover, the top end portion of the second duct exhaust portion 26D is arranged between the front end portion of the cover base portion 22A and the front end portion of the circular saw blade 16. That is, in a side view, the second duct exhaust portion 26D is arranged radially inward of the outer shape of the circular saw blade 16, and is arranged at a position overlapping with the front end portion of the circular saw blade 16 (refer to Figure 8 ). In addition, the top end of the second duct exhaust portion 26D is arranged close to the front side of the lower side rectifying piece 22D of the cover base portion 22A, and the top end opening of the second duct exhaust portion 26D is open to the upper side (refer to Figure 8 ) Therefore, a part of the air flow AR1 flowing into the inlet duct portion 26A is blown out to the upper side from the second duct exhaust portion 26D and is rectified by the lower side rectifying piece 22D.

[0155] That is, the duct 26 is configured as an air supply duct that divides the air flow AR1 flowing into the inflow duct portion 26A into an air flow AR2 exhausted from the first duct exhaust portion 26C and an air flow AR3 exhausted from the second duct exhaust portion 26D. Moreover, the direction of the air flow AR3 blown out from the second duct exhaust portion 26D is set to be substantially consistent with the cutting rotation direction of the circular saw blade 16.

[0156] (Regarding the driving mechanism 40) Figure 5 As shown, the drive mechanism 40 includes a motor 41 and an output shaft 50. The motor 41 is accommodated in the main body case 22. The motor 41 includes a rotating shaft 42, a rotor 43, and a stator 44.

[0157] The rotating shaft 42 is arranged with the left-right direction as the axial direction. The left end of the rotating shaft 42 is rotatably supported by a first motor bearing 47 fixed to the main body housing 22, and the right side of the rotating shaft 42 is rotatably supported by a second motor bearing 48 fixed to the main body housing 22. The right end of the rotating shaft 42 protrudes to the right from the second motor bearing 48, and a pinion 42A is formed at the right end of the rotating shaft 42.

[0158] The rotor 43 is formed in a substantially cylindrical shape with the left-right direction as the axial direction, is arranged on the radially outer side of the rotating shaft 42, and is configured to be able to rotate integrally with the rotating shaft 42. The stator 44 is formed in a substantially cylindrical shape with the front-rear direction as the axial direction, and is supported on the main body housing 22 on the radially outer side of the rotor 43. The stator 44 has a stator holder 44A, and a stator coil (not shown) is wound on the stator holder 44A. A motor substrate 45 is fixed to the left end of the stator holder 44A, and the stator coil is connected to the motor substrate 45. In addition, the motor substrate 45 is electrically connected to the control unit 56 described later through a wire not shown.

[0159] A fan 46 is provided on the right side of the rotating shaft 42 and on the left side of the second motor bearing 48 so as to be integrally rotatable. The fan 46 is configured as a centrifugal fan. Specifically, the fan 46 causes air to flow into the main body case 22 from the air inlet 22B of the main body case 22, thereby generating an air flow AR1 that flows from the opening 22C of the main body case 22 into the duct 26.

[0160] The output shaft 50 is arranged inside the main body housing 22 with the left-right direction as the axial direction. Specifically, the output shaft 50 is arranged below the right end (one end in the axial direction) of the rotating shaft 42 of the motor 41 and slightly behind the rotating shaft 42, and is rotatably supported by the main body housing 22. At the left end of the output shaft 50, an output gear (not shown) is provided in a manner that can rotate integrally.

[0161] Furthermore, a transmission gear (speed reduction mechanism) not shown in the figure is provided between the rotating shaft 42 and the output shaft 50. The transmission gear is configured as a two-speed gear, and meshes with the pinion 42A of the rotating shaft 42 and the output gear of the output shaft 50. In addition, the right end portion of the output shaft 50 is configured as a tool mounting portion, and the tool mounting portion is arranged in the cover base portion 22A. In addition, the tool mounting portion is formed in a substantially cylindrical shape open to the right side, and an external thread is formed on the inner circumference of the tool mounting portion. Moreover, the center portion of the circular saw blade 16 is externally inserted into the tool mounting portion via a washer 52, and the circular saw blade 16 is fixed to the right end portion of the output shaft 50 by a bolt BL. Thus, when the motor 41 is driven, the output shaft 50 and the circular saw blade 16 rotate in the cutting rotation direction around the axis of the output shaft 50.

[0162] In addition, if Figures 1 to 5 ,and Figure 8 As shown, the lower part of the circular saw blade is covered by a protective cover 54. The protective cover 54 is formed into a substantially semicircular shape that protrudes downward when viewed from the right side, and is formed into a concave shape that is open to the upper side. Specifically, the protective cover 54 includes the following components: an outer peripheral protection portion 54A that covers the circular saw blade 16 from the radial outside; a first side protection portion 54B that extends from the right end of the outer peripheral protection portion 54A to the radial inside of the circular saw blade 16; and a second side protection portion 54C that extends from the left end of the outer peripheral protection portion 54A to the radial inside of the circular saw blade 16. In addition, the second side protection portion 54C is connected to the output shaft 50 in a manner that can rotate around the axis of the output shaft 50.

[0163] Furthermore, the protective cover 54 is biased around the axis of the output shaft 50 by a biasing spring (not shown) and is held in the position. Figure 1 to Figure 5 On the other hand, when the cutting tool 10 is used for cutting, the protective cover 54 is pressed backward by the workpiece, and rotates to the other side around the axis of the output shaft 50 against the biasing force of the biasing spring ( Figure 8 The position indicated by the two-dot chain line in FIG. 5 is hereinafter referred to as the working position of the protective cover 54 . Furthermore, in the working position of the protective cover 54 , the lower portion of the circular saw blade 16 is exposed, and the upper portion of the circular saw blade 16 is covered by the protective cover 54 .

[0164] (Regarding the control unit 56) Figure 2As shown, the control unit 56 is accommodated in the front end of the battery installation unit 24B of the handle housing 24. The switch mechanism of the trigger 30 and the motor 41 are electrically connected to the control unit 56. Thus, by pulling the trigger 30, the motor 41 is driven, and the circular saw blade 16 rotates around the axis of the output shaft 50.

[0165] (About the battery pack 58) The battery pack 58 is formed into a substantially rectangular parallelepiped. The battery pack 58 is mounted on the battery mounting portion 24B of the cutting tool 10 from the rear side. The battery pack 58 has a connector (not shown) and is configured such that when the battery pack 58 is mounted, the connector is connected to the connector of the handle housing 24, and power is supplied from the battery pack 58 to the control unit 56.

[0166] (Regarding saw cover 60) Figure 3 to Figure 5 , Figure 7 to Figure 10 As shown, the saw cover 60 is made of resin, and is arranged adjacent to the right side of the cover base portion 22A of the main body case 22, and is configured as a cover portion that covers the circular saw blade 16 from the upper side and the right side. Specifically, the saw cover 60 includes the following components: a side cover portion 61 that is approximately semicircular in shape, with the left-right direction being the plate thickness direction; and an outer peripheral cover portion 62 that extends from the outer peripheral end of the side cover portion 61 to the right side. Moreover, the side cover portion 61 is configured as a wall portion that covers the upper portion of the circular saw blade 16 from the right side (one side in the axial direction of the motor 41), and the outer peripheral cover portion 62 is configured as a wall portion that covers the upper portion of the circular saw blade 16 from the radially outer side. The side cover portion 61 is formed of a permeable resin (plastic).

[0167] The outer peripheral cover portion 62 is disposed adjacent to the right side of the outer peripheral portion of the cover base portion 22A and is fixedly secured to the cover base portion 22A. The cover base portion 22A, the duct 26, and the saw cover 60 form a tool cover 70, and the upper portion of the circular saw blade 16 is covered by the tool cover 70. The interior of the tool cover 70 is formed as a tool storage area 70A for storing the upper portion of the circular saw blade 16.

[0168] like Figure 7 and Figure 8 As shown in the figure, a shielding portion 63 is formed at the upper portion of the side cover portion 61 on the radially outer side of the circular saw blade 16. The shielding portion 63 is formed in a substantially long plate shape with the radial direction of the circular saw blade 16 as the plate thickness direction and extending along the circumferential direction of the circular saw blade 16, and is formed to protrude to the left from the inner surface of the side cover portion 61. That is, the shielding portion 63 is a curved plate member extending along the circumferential direction of the circular saw blade 16 when viewed from the left side.

[0169] Thus, the tool storage area 70A is divided into sections in the radial direction of the circular saw blade 16 by the shielding portion 63. Specifically, the radial inner portion of the tool storage area 70A relative to the shielding portion 63 (the portion further inside than the shielding portion 63) of the circular saw blade 16 constitutes the working area 70B, and the radial outer portion of the tool storage area 70A relative to the shielding portion 63 (the portion further outside than the shielding portion 63) constitutes the non-working area 70C. Moreover, it is configured so that when the protective cover 54 is in the working position, the protective cover 54 is arranged in the working area 70B. In addition, the left end portion 63B (top end portion) of the shielding portion 63 is arranged on the left side of the outer peripheral cover portion 62 and the circular saw blade 16, and is arranged close to the right side of the cover base portion 22A. That is, a gap in the left-right direction is formed between the left end portion 63B (top end portion) of the shielding portion 63 and the right side of the cover base portion 22A. In addition, a gap in the front-rear direction is formed between the rear end of the shielding portion 63 and the rear end inner wall of the cover base portion 22A.

[0170] like Fig. 9 As shown in (B), an air supply guide portion 63A serving as a second rectifying portion is formed on the upper surface of the front portion 63C of the shielding portion 63. The air supply guide portion 63A is inclined in a curved shape toward the right side as it moves from the front left end portion of the shielding portion 63 toward the rear end side of the shielding portion 63 (the cutting rotation direction side of the circular saw blade 16). Furthermore, the right portion of the air supply guide portion 63A is arranged between the shielding portion 63 and the peripheral cover portion 62, and connects the two. Thus, a lower air supply outlet portion 64 serving as a second air supply outlet portion, which is composed of the shielding portion 63, the air supply guide portion 63A and the peripheral cover portion 62, is formed in the saw cover 60, and the front end portion of the lower air supply outlet portion 64 is connected to the working area 70B of the tool storage area 70A.

[0171] In addition, at the front portion 63C of the shielding portion 63 constituting the lower air outlet portion 64, an upper rectifying piece 64A (see Figure 7 ). The upper side straightening piece 64A extends downward from the front end of the lower side air supply outlet portion 64 (shielding portion 63) and is connected to the side cover portion 61. At the lower end of the upper side straightening piece 64A, a slit 64B open to the downward side is formed in the middle portion in the left-right direction. Moreover, the outer peripheral portion of the front end side of the circular saw blade 16 is arranged in the slit 64B. In addition, the lower end of the left end portion of the upper side straightening piece 64A (the portion further to the left than the slit 64B) is arranged close to the front side of the upper end portion of the lower side straightening piece 22D of the cover base portion 22A (refer to Figure 8). A limiting portion 22E is provided inside the saw cover 60 at a position in front of a box-side exhaust port 84E to be described later. The limiting portion 22E is a wall-like portion that protrudes to the right from the right side surface of the cover base portion 22A, and limits the forward movement of an object located in the non-working area 70C. In addition, the shielding portion 63 is formed in a shape in which its rear portion (rear portion 63D) is inclined downward as it moves toward the rear. To be precise, a rear portion 63D that is bent in a manner inclined toward the lower side is provided in the shielding portion 63. The rear end of the rear portion 63D is configured to be located further rearward than the rear end of the circular saw blade 16. A gap in the front-to-rear direction is formed between the rear end of the rear portion 63D (shielding portion 63) and the rear end inner wall of the saw cover 60.

[0172] Furthermore, the lower air outlet 64 is opened to the right. That is, a hole (outlet hole 64C) for opening the lower air outlet 64 is formed in the side cover 61, and the hole is configured as the outlet hole 64C (see Fig.12 ). Thus, in the working area 70B, the air flow AR3 exhausted from the second duct exhaust portion 26D merges with the air flow AR4 generated by the rotation of the circular saw blade 16, and the merged air flow flows into the lower air supply outlet portion 64, and flows out to the right from the outlet hole 64C of the lower air supply outlet portion 64. In addition, at this time, in the working area 70B, the chips rolled up by the circular saw blade 16 are inserted into the lower air supply outlet portion 64, and are discharged to the right from the outlet hole 64C of the lower air supply outlet portion 64. That is, the air flow AR4 is an air flow mixed with chips.

[0173] like Figure 7 and Fig.10 As shown, an upper air supply outlet portion 65 as a first air supply outlet portion is formed on the upper surface of the peripheral cover portion 62, on the upper side of the lower air supply outlet portion 64 and on the left side of the first duct exhaust portion 26C of the duct 26. The upper air supply outlet portion 65 is formed in a substantially U-shape open to the lower side when viewed from the side, corresponding to the first duct exhaust portion 26C, and both ends of the upper air supply outlet portion 65 in the longitudinal direction are connected to the peripheral cover portion 62. Moreover, the first duct exhaust portion 26C is connected to the upper air supply outlet portion 65, and the interior of the first duct exhaust portion 26C is connected to the interior of the upper air supply outlet portion 65. As a result, the air flow AR2 exhausted from the first duct exhaust portion 26C is exhausted to the right side from the upper air supply outlet portion 65.

[0174] The duct 26 , and the lower air outlet 64 and the upper air outlet 65 of the saw cover 60 constitute an air supply unit that supplies the air flow generated by the fan 46 to a dust box 80 to be described later.

[0175] like Figure 4As shown, a cover side cutout portion 61A is formed in the middle of the front-back direction at the lower end of the side cover portion 61, and the cover side cutout portion 61A is formed in a substantially semicircular shape that is open to the lower side when viewed from the side. Moreover, when the dust box 80 described later is removed from the tool body 12, the bolt BL screwed to the output shaft 50 is exposed to the right side through the cover side cutout portion 61A.

[0176] A communication hole 61B is formed through the upper end of the rear portion of the side cover portion 61. The communication hole 61B is formed in a long hole shape along the length direction of the shielding portion 63 when viewed from the side, and is arranged between the outer peripheral cover portion 62 and the shielding portion 63. That is, the inside and outside of the non-operating area 70C of the tool cover 70 are connected through the communication hole 61B.

[0177] At the upper end of the side cover portion 61, between the lower air outlet portion 64 and the communicating hole 61B, a button insertion portion 61C is formed through, into which a part of a mounting and dismounting button 86 of the dust box 80 described later is inserted, and the button insertion portion 61C is formed in a substantially rectangular shape. In addition, at the lower end of the side cover portion 61, a pair of front and rear fixing holes 61D for fixing the dust box 80 described later are formed through on the front and rear sides of the cover side cutout portion 61A, and the fixing holes 61D are formed in a substantially rectangular shape.

[0178] (Regarding the protective member 68) Figure 4 , Fig. 9 (B) and Fig.12 As shown, the protective member 68 is arranged inside the lower air outlet portion 64 of the saw cover 60, and is configured as a member for protecting the bottom wall (shielding portion 63) of the lower air outlet portion 64. The protective member 68 is formed in a plate shape arranged parallel to the bottom wall of the lower air outlet portion 64. That is, when viewed from the side, the protective member 68 is curved in a curved shape along the length direction of the shielding portion 63. In addition, the protective member 68 is formed in a roughly triangular shape in a similar shape to the bottom surface of the lower air outlet portion 64 when viewed from the plate thickness direction of the shielding portion 63, and is adjacently arranged on the upper side of the bottom surface of the lower air outlet portion 64. That is, the right end portion of the protective member 68 extends linearly in the front-to-back direction, and the left end portion of the protective member 68 is inclined in a curved shape to the right side as it moves toward the rear side.

[0179] In addition, the right end of the protective member 68 protrudes slightly to the right from the outlet hole 64C of the lower air outlet portion 64. Furthermore, the rear end of the protective member 68 is inserted into the groove portion 64D formed in the lower air outlet portion 64 of the saw cover 60. In addition, a protective member fixing portion 68A that protrudes to the right and bends upward is formed at the rear end of the protective member 68. Moreover, the protective member fixing portion 68A is arranged on the left side of the rear side peripheral portion of the outlet hole 64C of the lower air outlet portion 64, and is fixed to the side cover portion 61 by welding.

[0180] (About the dust box 80) Figure 3 to Figure 5 and Figures 9 to 12 As shown, the dust box 80 is detachably mounted on the saw cover 60 of the tool body 12 and is adjacent to the right side of the saw cover 60. Moreover, the dust box 80 is configured to store the chips discharged from the lower air supply outlet 64 of the saw cover 60. The dust box 80 includes an outer housing 82 as a housing, an inner housing 84, a loading and unloading button 86, and a dust collector connection part 90. The front end of the dust box 80 is formed in a shape that is inclined downward and backward. Through the inclined structure, the lower front end of the side cover part 61 ( Figure 3 The portion indicated by the reference numeral 61 in the figure is not covered by the dust box 80. Thus, it is configured so that the operator can visually check the front end (cutting portion) of the circular saw blade 16 from the right side through a portion (front end lower portion) of the transparent side cover portion 61.

[0181] (Regarding the outer casing 82) The outer casing 82 includes a transparent resin material, and is formed into a roughly rectangular box shape that is open to the left side and has the front-to-rear direction as its length direction. Furthermore, the interior of the outer casing 82 is configured as a dust collection chamber 80A for storing chips. In the opening portion on the lower side of the outer casing 82, a pair of front and rear box-side engaging hooks 82A are formed at positions corresponding to the fixing holes 61D of the saw cover 60. The box-side engaging hooks 82A extend in the front-to-rear direction and are formed into a roughly inverted L shape when viewed from the front, and protrude downward from the outer casing 82. Furthermore, the box-side engaging hooks 82A are inserted into the fixing holes 61D of the saw cover 60, and engage with the lower side edge of the fixing holes 61D, thereby mounting the lower end portion of the outer casing 82 on the saw cover 60 (refer to Fig.10 On the other hand, the upper end of the outer casing 82 is mounted on the saw cover 60 via a mounting and removal button 86 described later.

[0182] Furthermore, when the dust box 80 is mounted on the saw cover 60, the upper surface of the outer housing 82 is curved in a substantially arc shape when viewed from the side so as to be flush with the upper surface of the saw cover 60. In addition, a portion of the right wall of the outer housing 82 that faces the lower air outlet 64 and the upper air outlet 65 in the left-right direction is configured as a housing guide 82B as a guide. That is, the housing guide 82B configures a portion of the inner circumference of the dust chamber 80A.

[0183] like Fig.11 As shown in FIG. 1 , a plurality of (three in this embodiment) fixing bosses 82C for fixing the inner housing 84 described later are formed on the right wall of the outer housing 82. The fixing bosses 82C are formed in a substantially cylindrical shape with the left-right direction as the axial direction, and protrude to the left from the right wall of the outer housing 82. In addition, the fixing bosses 82C are formed at the front end, rear end, and upper end of the outer housing 82. Fig.11In the figure, only two fixing bosses 82C provided at the front end and the upper end of the outer housing 82 are shown.

[0184] A button receiving portion 82D for receiving a mounting and detaching button 86 described later is formed in the middle of the upper wall of the outer housing 82 in the front-to-back direction. The button receiving portion 82D is formed in a concave shape open to the upper side and the left side, and is arranged on the right side of the button insertion portion 61C of the saw cover 60. A pair of front and rear locking ribs 82E are formed in the upper opening of the button receiving portion 82D. The locking ribs 82E protrude from the front and rear inner peripheral surfaces of the button receiving portion 82D toward the inside in the front-to-back direction, and extend in the left-right direction.

[0185] A housing inclined portion 82F is formed at the lower end of the right wall of the outer housing 82. The housing inclined portion 82F is inclined upward as it goes to the right side when viewed from the front (see FIG. Fig. 9 (A)). The outer surface of the housing inclined portion 82F is formed with a concavo-convex shape, so that the dust box 80 can be easily grasped and operated (see Fig. 9 (A)).

[0186] At the rear end of the outer casing 82, a mounting portion 82G for mounting a dust collector connection portion 90 described later is formed. The mounting portion 82G is formed in a substantially rectangular cylindrical shape with the front-rear direction as the axial direction and the up-down direction as the longitudinal direction, and protrudes from the outer casing 82 to the rear side. In addition, the left portion of the mounting portion 82G protrudes to the left side than the outer casing 82. Furthermore, at the rear wall of the outer casing 82, a discharge hole 82H is formed through which the interior of the outer casing 82 is connected to the interior of the mounting portion 82G.

[0187] (Regarding the inner housing 84) Fig.11 and Fig.12 As shown, the inner housing 84 includes a metal plate. The inner housing 84 is arranged with the left and right direction as the plate thickness direction, and is formed so that when viewed from the right side, the outer shape of the inner housing 84 is similar to the outer shape of the outer housing 82. That is, the upper end of the inner housing 84 is curved in a generally arc shape protruding upward. In the inner housing 84, a fixing hole 84A is formed through a position corresponding to the fixing boss 82C of the outer housing 82. Moreover, a fixing screw SC is inserted into the fixing hole 84A from the left side and screwed into the fixing boss 82C, and the inner housing 84 is fixed to the outer housing 82. In addition, when the inner housing 84 is fixed to the outer housing 82, the inner housing 84 is arranged on the inner side of the opening of the outer housing 82, and the opening of the outer housing 82 is closed by the inner housing 84.

[0188] On the outer upper side of the front portion of the inner casing 84 of the dust box 80, there is formed a box inlet portion 84B serving as an air intake portion, and the box inlet portion 84B is formed by being cut in a manner that descends one level downward from the outer periphery of the inner casing 84 when viewed from the right side. That is, a space (gap) extending frontward, rearward, and upward and downward is formed between the front upper portion of the inner casing 84 and the front upper portion of the outer casing 82, and the space becomes the box inlet portion 84B (air intake portion) that opens to the left. Moreover, the lower air supply outlet portion 64 of the saw cover 60 is exposed (opened) to the dust collecting chamber 80A in a manner that is opposite to the box inlet portion 84B. Through the box inlet portion 84B formed in this way, the upper air supply outlet portion 65 and the lower air supply outlet portion 64 of the saw cover 60 are connected to the dust collecting chamber 80A, forming an air path that improves the heat resistance of the dust box 80. In addition, at Fig.11 In FIG. 1 , a reference numeral is given to the position of the box inlet portion 84B (a cutout portion of the inner casing 84 ) in a state where the inner casing 84 and the outer casing 82 are assembled.

[0189] A stopper wall 84C is formed at the upper end of the inner housing 84, on the upper side of the rear end of the box inlet 84B. The stopper wall 84C is formed in a substantially rectangular plate shape that is bent to the right and has the front-to-rear direction as the plate thickness direction, and is arranged on the cutting rotation direction side of the circular saw blade 16 relative to the lower air supply outlet 64 when viewed from the side. Thus, the chips discharged from the outlet hole 64C of the lower air supply outlet 64 to the right side and the rotation direction side of the circular saw blade 16 collide with the stopper wall 84C. In other words, the chips from the outlet hole 64C are prevented from violently colliding with a part of the outer housing 82 (the front part of the button accommodating portion 82D described later) by the stopper wall 84C.

[0190] A button insertion groove 84D for inserting a mounting button 86 described later is formed at the upper end of the inner housing 84 behind the stopper wall 84C. The button insertion groove 84D is formed in a concave shape open to the upper side and is arranged on the right side of the button insertion portion 61C of the saw cover 60.

[0191] In addition, at the rear of the inner housing 84, at the rear side (one side in the front-to-back direction) of the box inlet 84B, a plurality of (two in the present embodiment) box-side exhaust ports 84E are formed as exhaust portions. By providing a plurality of box-side exhaust ports 84E, it is possible to prevent chips and the like from entering the non-operating area 70C from the dust collecting chamber 80A. The box-side exhaust port 84E is arranged adjacent to the right side of the connecting hole 61B of the saw cover 60, and is arranged inside the connecting hole 61B when viewed from the left side (see FIG. 1 ). Figure 8). Thus, the dust collecting chamber 80A of the dust box 80 is connected to the non-working area 70C of the tool cover 70 through the connecting hole 61B and the box side exhaust port 84E. In other words, the non-working area 70C is connected to the box side exhaust port 84E through the connecting hole 61B. Therefore, it is configured so that the air flow flowing into the dust collecting chamber 80A can be exhausted to the non-working area 70C of the tool cover 70. In addition, in the up and down directions, the box side exhaust port 84E is arranged at a position overlapping with the box inlet portion 84B. The box side exhaust port 84E is located further to the rear than the center of the circular saw blade 16. In addition, the connecting hole 61B is an opening of a size that allows multiple box side exhaust ports 84E to be connected to the non-working area 70C together. Therefore, in a state where the dust box 80 is removed, it is easy to visually identify the inside of the non-working area 70C from the connecting hole 61B, and it is also easy to remove foreign matter when it invades the non-working area 70C. In addition, if Figure 8 or Fig.12 As shown in the figure, when viewed in the left-right direction, the fixing screw SC for fixing the inner housing 84 to the dust box 80 is located at the position of the communication hole 61B, and the communication hole 61B also functions as a relief portion for preventing the head portion (screw head) of the fixing screw SC from contacting the outer peripheral cover portion 62. In other words, the head portion of the fixing screw SC is configured so as not to contact the outer peripheral cover portion 62 by being located inside the communication hole 61B.

[0192] like Fig. 9 As shown in (A), a box bottom 84F bent to the right is formed at the lower end of the inner housing 84, and the box bottom 84F extends in the front-to-back direction and is adjacently arranged on the upper side of the lower wall of the outer housing 82. Thus, the box bottom 84F constitutes the bottom of the dust collecting chamber 80A. In addition, an inclined portion 84G corresponding to the housing inclined portion 82F of the outer housing 82 is formed at the top end of the box bottom 84F. The inclined portion 84G is inclined toward the upper side as it moves toward the right side when viewed from the front side, and is adjacently arranged on the left side of the housing inclined portion 82F of the outer housing 82.

[0193] (Regarding the loading and unloading button 86) Figure 1 , Figure 3 , Fig. 9 (A) and Fig.11 As shown, the attachment button 86 is formed in a generally rectangular box shape that is open to the bottom, and is disposed in the button receiving portion 82D of the outer housing 82. Engagement protrusions 86A are formed on the front and rear surfaces of the attachment button 86. The engagement protrusions 86A are disposed adjacent to the lower side of the locking rib 82E of the outer housing 82.

[0194] In addition, a button spring 88 is disposed inside the mounting and dismounting button 86 (see Fig. 9(A)). The button spring 88 is configured as a compression coil spring, the upper end of the button spring 88 is locked to the upper wall of the loading and unloading button 86, and the lower end of the button spring 88 is locked to the lower wall of the button accommodating portion 82D. As a result, the loading and unloading button 86 is urged upward by the button spring 88, and the engaging protrusion 86A abuts against the locking rib 82E. Therefore, the loading and unloading button 86 is configured to be able to be pressed downward.

[0195] In addition, a button engaging piece 86B is formed on the loading and unloading button 86. The button engaging piece 86B protrudes to the left from the loading and unloading button 86 with the up-down direction being the plate thickness direction. Specifically, the button engaging piece 86B is inserted into the button insertion groove 84D of the inner housing 84, and the top end of the button engaging piece 86B is inserted into the button insertion portion 61C of the saw cover 60. The width dimension (dimension in the front-to-back direction) of the button engaging piece 86B is set to be slightly smaller than the width dimension of the button insertion groove 84D. Thus, the position of the loading and unloading button 86 in the front-to-back direction is determined by the button insertion groove 84D of the inner housing 84. That is, the movement of the loading and unloading button 86 in the front-to-back direction and the left direction is restricted by the inner housing 84.

[0196] Furthermore, an engaged hook portion 86C protruding upward is formed at the top end of the button engaging piece 86B. The engaged hook portion 86C engages with the upper edge of the button inserting portion 61C of the saw cover 60 in the left-right direction. As a result, the movement of the upper end of the dust box 80 to the right is restricted. Moreover, by pressing the loading and unloading button 86 downward, the engaged state between the engaged hook portion 86C and the saw cover 60 is released. As a result, the dust box 80 can be removed from the tool body 12. In this way, the button inserting portion 61C functions as a support portion that supports the dust box 80 so that it can be loaded and unloaded.

[0197] (About the dust collector connection part 90) Figure 1 , Figure 3 , Figure 4 and Fig.11 As shown, the dust collector connection part 90 includes the following components: a mounted part 90A, which constitutes the front part of the dust collector connection part 90; and a connecting cylinder part 90B, which constitutes the rear part of the dust collector connection part 90. The mounted part 90A is formed into a substantially rectangular box shape open to the front side. Moreover, the mounted part 90A is connected to the mounting part 82G in a manner that closes the mounting part 82G of the outer housing 82. Specifically, the upper end of the mounted part 90A is connected to the upper end of the mounting part 82G of the outer housing 82 in a rotatable manner with the left-right direction as the axial direction.

[0198] The connecting cylinder 90B is formed into a generally cylindrical shape with the front-rear direction as the axial direction, and protrudes from the installed portion 90A to the rear side. In addition, the interior of the connecting cylinder 90B is communicated with the interior of the installed portion 90A. Moreover, it is configured so that a hose of a dust collector not shown is connected to the rear end of the connecting cylinder 90B. Thus, it is configured so that the chips of the dust box 80 are sucked by the dust collector and discharged to the outside of the dust box 80. In addition, when the hose of the dust collector is not connected to the connecting cylinder 90B, a bottomed cylindrical cap 92 is installed on the connecting cylinder 90B.

[0199] (Operation and Effect) Next, the operation and effect of the cutting tool 10 of this embodiment will be described.

[0200] When the cutting tool 10 constructed as described above is used for cutting, the base 14 is placed on the workpiece, and the trigger 30 is pulled. As a result, the motor 41 is driven, and the driving force of the motor 41 is transmitted to the circular saw blade 16, and the circular saw blade 16 rotates in the cutting rotation direction. Then, by moving the cutting tool 10 forward, the protective cover 54 rotates from the protective position to the working position through the workpiece, and the lower part of the circular saw blade 16 is exposed. As a result, the workpiece is cut.

[0201] When the cutting tool 10 is in operation, the fan 46 rotates to generate an air flow AR1 that flows from the air inlet 22B into the main body housing 22. The air flow AR1 flows radially outward from the fan 46 and flows from the opening 22C of the main body housing 22 into the duct 26 (see FIG. Figure 5 The air flow AR1 flowing into the duct 26 is divided into an air flow AR2 flowing toward the first duct exhaust portion 26C of the duct 26 and an air flow AR3 flowing toward the second duct exhaust portion 26D (see Fig.10 (A)).

[0202] Moreover, if Fig.10 (A) and Fig.10 As shown in (B), the air flow AR2 is transported from the first duct exhaust portion 26C to the upper air supply outlet portion 65, and flows out from the upper air supply outlet portion 65 to the right side (dust box 80 side). As a result, the air flow AR2 flows into the interior of the dust collecting chamber 80A from the box inlet portion 84B of the dust collecting chamber 80. The air flow AR2 that flows into the dust collecting chamber 80A hits the casing guide portion 82B of the dust collecting box 80 (the inner wall of the dust collecting chamber 80A), and the direction of the air flow AR2 is changed to the downward side. As a result, the air flow AR2 flows toward the downward side at the front end portion of the dust collecting chamber 80A (refer to Fig.12 ).

[0203] On the other hand, Figure 8 and Fig.10As shown in (A), the air flow AR3 flows out from the second duct exhaust portion 26D to the upper side, and flows toward the upper side at the front end portion of the working area 70B of the tool cover 70. In addition, when the cutting tool 10 is working, the air flow AR4 toward the cutting rotation direction is generated by the rotation of the circular saw blade 16 and the movement of the cut processing piece. Therefore, the air flow AR3 merges with the air flow AR4 and flows toward the upper side in the front end portion of the working area 70B. Furthermore, at this time, the air flow AR3 and the air flow AR4 are rectified by the lower side straightening piece 22D and the upper side straightening piece 64A, and flow to the lower side air supply outlet 64 side of the saw cover 60.

[0204] In addition, when the workpiece is cut, the chips generated by the cutting process are transported upward by the momentum of the cutting process and the air flow AR4 of the circular saw blade 16. Specifically, the chips are generated in a manner of being blown upward from the outer peripheral portion of the front end of the circular saw blade 16, and move upward and backward along the outer peripheral portion of the tool cover 70. Therefore, the air flow AR3 that merges with the air flow AR4 flows into the lower air supply outlet portion 64 of the saw cover 60 together with the chips moving upward. Then, the air flow AR3 and the chips (air flow AR4) that move into the lower air supply outlet portion 64 are rectified by the air supply guide portion 63A toward the outlet hole 64C side of the lower air supply outlet portion 64, and flow out from the outlet hole 64C to the right. The air flow AR3 that reaches the lower air supply outlet portion 64 includes the air flow AR4, but for the sake of convenience of explanation, the description of the air flow AR4 is omitted below.

[0205] Moreover, if Fig.10 (A) and Fig.10 As shown in (B), the air flow AR3 and the chips flow into the dust collecting chamber 80A from the box inlet 84B of the dust collecting box 80. As a result, the chips fall to the bottom of the dust collecting chamber 80A and accumulate in the dust collecting chamber 80A. In addition, the air flow AR3 flowing into the dust collecting chamber 80A hits the casing guide 82B of the dust collecting box 80, and the direction of the air flow AR3 changes to the downward side. As a result, the air flow AR3 flows toward the downward side at the front end of the dust collecting chamber 80A together with the air flow AR2 (refer to Fig.12 ).

[0206] like Fig.12 As shown in FIG. 1 , if the air flow AR2 and the air flow AR3 (i.e., the air flow AR1) flowing downward reach the lower end of the dust collecting chamber 80A, the air flow AR2 and the air flow AR3 hit the bottom of the dust collecting chamber 80A, and the direction of the air flow AR2 and the air flow AR3 changes to the rear side. Thus, the air flow AR2 and the air flow AR3 flow from the front end of the dust collecting chamber 80A to the rear end.

[0207] A box side exhaust port 84E is formed at the rear end of the dust box 80. In addition, since the air flow AR2 and the air flow AR3 can be continuously transported to the inside of the dust chamber 80A as long as the fan 46 rotates, the pressure of the front and lower parts of the dust chamber 80A becomes high. Therefore, the air flow AR2 and the air flow AR3 reaching the rear end of the dust box 80 are pushed by the air flow transported from the front, move upward and flow toward the box side exhaust port 84E. That is, the air flow AR2 and the air flow AR3 flow toward the upper side at the rear end of the dust chamber 80A. Then, the air flow AR2 and the air flow AR3 are exhausted from the box side exhaust port 84E to the non-working area 70C of the tool cover 70. In this way, the flow of air is formed in the dust chamber 80A. The air exhausted to the left in the non-working area 70C passes through the gap in the left and right directions between the left end 63B (top end) of the shielding portion 63 and the right side of the cover base portion 22A and moves to the inside of the tool cover 70. Here, even if the chips that have entered the non-operating area 70C move from the gap in the left-right direction into the tool cover 70, since the gap is separated from the circular saw blade 16 in the left direction ( Fig. 9 ), so the circular saw blade 16 can be appropriately suppressed from contacting with the chips. In addition, since the cover base portion 22A is made of metal, even if it comes into contact with the chips, there is almost no possibility of deformation or damage to the extent that it will hinder workability. In addition, the air exhausted to the left in the non-working area 70C passes through the gap in the front-to-back direction between the rear end of the shielding portion 63 and the rear end inner wall of the cover base portion 22A (and the rear end inner wall of the saw cover 60) and moves into the interior of the tool cover 70. Even if the chips should move into the tool cover 70 from the gap in the front-to-back direction, since the gap in the front-to-back direction (the rear portion 63D) is located further back than the rear end of the circular saw blade 16 ( Figure 7 , Figure 8 ), so the chips can also be prevented from coming into contact with the circular saw blade 16.

[0208] When the workpiece is a metal material such as mild steel, the hot chips are discharged from the lower air outlet 64 of the saw cover 60 into the dust collecting chamber 80A of the dust collecting box 80. In addition, the outer housing 82 constituting the dust collecting chamber 80A is made of resin. Therefore, the outer housing 82 may be thermally deformed by the chips.

[0209] Here, as described above, the dust box 80 is composed of the following components: a box inlet 84B, which allows the air flow AR1 (air flow AR2 and air flow AR3) generated by the fan 46 to flow into the dust chamber 80A; and a box side exhaust port 84E, which allows the air flow AR1 in the dust chamber 80A to be exhausted to the outside of the dust chamber 80A, and the box side exhaust port 84E is arranged at the rear side of the box inlet 84B. In other words, the box inlet 84B is provided at the front side portion of the dust box 80, and the box side exhaust port 84E is provided at the rear side portion of the dust box 80. In more detail, the box inlet 84B is provided at a portion of the dust box 80 that is closer to the front than the center position in the front-to-back direction, and the box side exhaust port 84E is provided at a portion of the dust box 80 that is closer to the rear than the center position in the front-to-back direction. As a result, the flow of the air flow AR1 moving from the front side to the rear side can be smooth, thereby appropriately cooling the dust box 80. When both the box inlet 84B and the box side exhaust port 84E are arranged at the front or rear of the dust box 80, the air flow AR1 becomes a U-turn in the front-to-back direction, so the outflowing air flow AR1 hinders the flow of the incoming air flow AR1, and the flow of air may be turbulent, but this problem can be suppressed in the present embodiment. In addition, the dust box 80 has a casing guide portion 82B that guides the air flow AR1 flowing from the box inlet 84B into the dust collecting chamber 80A to the lower side. Therefore, as described above, the air flow AR1 flowing into the dust collecting chamber 80A toward the right side flows to the lower side at the front end of the dust collecting chamber 80A, then flows to the rear side at the lower end of the dust collecting chamber 80A, then flows to the upper side at the rear end of the dust collecting chamber 80A, and finally flows to the left side and reaches the box side exhaust port 84E. That is, the air flow AR1 can flow in the dust collecting chamber 80A in a substantially entire flow. Specifically, the structure is such that the air intake (box inlet 84B) and the exhaust (box side exhaust port 84E) of the dust collecting chamber 80A opening in the same direction (left direction) are separated front and back, and the flow of the air flowing in from the air intake (box inlet 84B) is made to be along the left and right direction, thereby rectifying the flow of the air in the dust collecting chamber 80A in the order of right direction, downward direction, rear direction, upward direction, and left direction. Thus, the inside of the dust collecting chamber 80A can be cooled efficiently, thereby improving the heat resistance of the cutting tool 10. In addition, since the chips also flow in from the box inlet 84B to the right, it is very likely that the right inner wall of the dust collecting chamber 80A (the right wall of the dust collecting box 80) will first contact the hot chips. In the part of the dust collecting box 80, it is important to ensure the heat resistance of the right wall. In this embodiment, the air flow AR1 flowing into the dust collecting chamber 80A toward the right first touches the right inner wall of the dust collecting chamber 80A (the right wall of the outer housing 82), so the right inner wall can be cooled preferentially. Thus, the resin outer housing 82 constituting the dust collecting chamber 80A can be efficiently cooled by the air flow AR1 flowing into the dust collecting chamber 80A.Therefore, the heat resistance of the cutting tool 10 can be improved. In addition, the collected chips are accumulated in the lower part of the dust collecting chamber 80A, and since the air flow AR1 moves backward in the lower part of the dust collecting chamber 80A, the accumulated chips can be cooled at any time. Furthermore, since the metal box bottom 84F is located at the lower end of the dust collecting chamber 80A, the heat of the accumulated chips can be absorbed from below and dissipated. That is, the chips accumulated in the dust collecting chamber 80A are cooled quickly by being cooled from both the lower side and the upper side, so that the heat of the chips can be suppressed from being excessively transferred to the outer housing 82. In addition, such a structure can be easily constructed by the embodiment of the present application in which the dust box 80 is connected to the right side of the saw cover 60. For example, in the case of a configuration in which the dust box 80 is mounted on the upper portion (peripheral portion) of the saw cover 60, it becomes more necessary to mount the dust box 80 on the rear portion of the saw cover 60 or to arrange the air intake and exhaust portions of the dust box adjacent to each other. However, in the case of the embodiment of the present application, since there is no such design restriction, the above-mentioned structure can be easily adopted. In addition, in the case of the embodiment of the present application in which the dust box 80 is connected to the right side of the saw cover 60, compared with the configuration in which the dust box 80 is mounted on the upper portion (peripheral portion) of the saw cover 60, it is easy to collect dust in the dust box 80 even if the rising position of the cut chips during processing is low. Therefore, even the chips of metal materials (mild steel) whose size and mass of each chip are large compared to wood can be appropriately collected.

[0210] In addition, in the up-down direction, the box inlet 84B and the box side exhaust port 84E are arranged at overlapping positions. Specifically, the box inlet 84B and the box side exhaust port 84E are formed at the upper end side portion of the dust box 80, and are separately arranged in the front-to-back direction. As a result, the area in the up-down direction of the air flow AR1 flowing at the front and rear ends of the dust chamber 80A can be set large, and the chip collection space of the dust chamber 80A can also be ensured. Therefore, the outer housing 82 can be cooled more efficiently by the air flow AR1. In addition, the upper part of the circular saw blade 16 in the shape of a circular plate is covered by the saw cover 60, but since it is a structure covering the upper half of the circular member, its length direction is the front-to-back direction. The dust box 80 is installed on the saw cover 60, and since it is a similar shape to its outer shape, the length direction of the dust box 80 is also the front-to-back direction. Here, since the box inlet 84B and the box side exhaust port 84E are separately arranged in the front-to-back direction, the air can flow greatly in the dust box 80, so that the dust box 80 (dust collecting chamber 80A) can be effectively cooled. Specifically, the box inlet 84B is located further forward than the center of the circular saw blade 16, and the box side exhaust port 84E is located further rearward than the center of the circular saw blade 16. In addition, the box inlet 84B is located further rearward than the front end of the circular saw blade 16, and the box side exhaust port 84E is located further forward than the rear end of the circular saw blade 16. In addition, the lower end position of the box side exhaust port 84E is set higher than the lower end position of the box inlet 84B, and when the chips in the dust collecting chamber 80A become full during the cutting process, the chips first overflow from the box inlet 84B. In this way, the chips are prevented from entering the non-working area 70C.

[0211] In addition, when the cutting tool 10 is in operation, the air flow AR2 without chips flows out from the upper air outlet 65 to the inside of the dust collecting chamber 80A, and the air flow AR3 containing chips flows out from the lower air outlet 64 to the inside of the dust collecting chamber 80A. Thus, the chips can be discharged to the dust collecting box 80, and the air flow AR2 whose temperature rise due to the chips is suppressed flows into the dust collecting box 80. Thus, the outer housing 82 can be effectively cooled by the air flow AR2 without chips.

[0212] In addition, as described above, the air flow AR2 flowing into the interior of the dust collecting chamber 80A from the upper air supply outlet portion 65 is changed to a flow toward the lower side by the casing guide portion 82B. Therefore, the air flow AR2 can be flexibly used to apply force to the lower side in the dust collecting chamber 80A to the chips discharged from the lower air supply outlet portion 64 together with the air flow AR3. The effect is appropriately achieved by the upper air supply outlet portion 65 being adjacent to the lower air supply outlet portion 64. In addition, it can also be appropriately achieved by making the upper air supply outlet portion 65 and the lower air supply outlet portion 64 open in the same direction. Thus, the chips can be suppressed from colliding in the interior of the dust collecting chamber 80A (rebound, etc.), and the chips in the dust collecting chamber 80A that move upward due to rebound, etc. can be suppressed from flowing back from the lower air supply outlet portion 64. Therefore, the dust collection performance of the chips can be improved. Furthermore, the upper air outlet portion 65 has a lattice-like structure, and even if the chips are moved to the upper end of the dust collecting chamber 80A, the lattice-like structure can appropriately suppress the backflow from the upper air outlet portion 65 .

[0213] In addition, the duct 26 has a second duct exhaust portion 26D, and the air flow AR3 is exhausted from the second duct exhaust portion 26D toward the upper side in the tool storage area 70A (working area 70B) of the tool cover 70. In addition, the second duct exhaust portion 26D is arranged on the lower side of the lower air supply outlet portion 64. Thus, the air flow AR3 is exhausted toward the lower air supply outlet portion 64 side in the tool storage area 70A (working area 70B). Therefore, the air flow AR3 can be flexibly used to guide the chips generated during the cutting process into the lower air supply outlet portion 64. Therefore, the dust collection performance of the chips can be further improved.

[0214] In addition, the second duct exhaust part 26D is arranged on the radial inner side of the outer shape of the circular saw blade 16 when viewed from the side. Therefore, the chips generated during the cutting process can be prevented from interfering with the second duct exhaust part 26D. That is, the damage or deformation of the second duct exhaust part 26D caused by the chips can be prevented, and the flow of the chips can be prevented from being blocked by the second duct exhaust part 26D, while the air flow AR3 is exhausted from the second duct exhaust part 26D. Furthermore, the air flow AR3 toward the top becomes a curtain of the flow of air, which can prevent the chips from moving to the rear of the second duct exhaust part 26D, thereby further improving the dust collection efficiency. In addition, the second duct exhaust part 26D is not opened directly upward, but slightly tilted forward. As a result, the exhaust from the second duct exhaust part 26D is directed toward the lower air supply outlet 64 after being directed toward the front. By forming such an air flow, the chips moving upward are forced forward. Therefore, it is possible to suppress the chips from excessively moving backward, so that the chips can be more appropriately guided to the lower air supply outlet 64. In addition, by directing the exhaust from the second duct exhaust part 26D to the front, the flow of the air flow AR3 is suppressed from being disturbed by the upper side straightening piece 64A. That is, when the exhaust is directly upward from the second duct exhaust part 26D, there is a risk that the air flow collides with the upper side straightening piece 64A and the flow of the air is disturbed, but in this embodiment, a structure that is not easy to cause such air turbulence can be formed, thereby achieving improved dust collection and cooling performance.

[0215] In addition, the lower side rectifying piece 22D and the upper side rectifying piece 64A are provided between the lower side air supply outlet portion 64 and the second duct exhaust portion 26D, and the air flow AR3 exhausted from the second duct exhaust portion 26D is rectified toward the second duct exhaust portion 26D side by the lower side air supply outlet portion 64 and the second duct exhaust portion 26D. Thus, the air flow AR3 flowing inside the tool cover 70 (the working area 70B) can be efficiently flowed into the lower side air supply outlet portion 64. In addition, the upper side rectifying piece 64A also functions as a wall member for suppressing the movement of the chips generated by the operation to the rear of the position of the upper side rectifying piece 64A, thereby improving the dust collection efficiency of the chips.

[0216] In addition, an air supply guide 63A is formed at the lower air supply outlet 64 of the saw cover 60, and the air supply guide 63A is inclined to the right side (toward the dust box 80 side) along the cutting rotation direction of the circular saw blade 16. Therefore, the air flow AR3 flowing into the lower air supply outlet 64 can be rectified, and the direction of the air flow AR3 can be changed to the dust box 80 side. As a result, the air flow AR3 can be efficiently flowed into the dust collection chamber 80A of the dust box 80.

[0217] In addition, the casing guide 82B of the dust box 80 is disposed opposite to the lower air outlet 64 and the upper air outlet 65 in the left-right direction, and constitutes a part of the inner peripheral surface of the dust collecting chamber 80A. Thus, the inner peripheral surface of the dust collecting chamber 80A can be flexibly utilized, and the direction of the air flow AR2 and the air flow AR3 flowing into the dust collecting chamber 80A is changed to the lower side. In addition, since the outer casing 82 is resin-made, the casing guide 82B can be easily formed into a suitable shape. And then, since the outer casing 82 is formed by a transparent resin material, it is easy to visually observe the state of the chips accumulated in the dust collecting chamber 80A. In addition, since the heat resistance of the resin material is lower than that of the metal material in most cases, therefore when the inside of the dust collecting chamber 80A can be visually observed by the resin material, as mentioned above, it is worried that the heat resistance will be reduced, but in the present embodiment, since the heat resistance of the outer casing 82 has been improved, the workability can be improved.

[0218] In addition, the dust chamber 80A of the dust box 80 has a vertical dimension smaller than a front-rear dimension. Therefore, in the dust box 80 disposed adjacent to the right side of the tool cover 70 covering the upper portion of the circular saw blade 16, the cross-sectional area of ​​the dust chamber 80A for storing the chips can be set larger when viewed from the right side.

[0219] In addition, in the cutting tool 10, a shielding portion 63 is formed on the saw cover 60 constituting the tool cover 70, and the tool storage area 70A inside the tool cover 70 is divided into a working area 70B and a non-working area 70C by the shielding portion 63. Furthermore, a box side exhaust port 84E is formed in the inner housing 84 of the dust box 80, and the dust collecting chamber 80A is connected to the non-working area 70C through the box side exhaust port 84E. As a result, the air flow AR2 and the air flow AR3 flowing into the dust collecting chamber 80A can be exhausted from the box side exhaust port 84E to the non-working area 70C, thereby cooling the tool cover 70. Therefore, the heat resistance of the cutting tool 10 can be improved.

[0220] Moreover, the upper part of the circular saw blade 16 is accommodated in the working area 70B and covered by the tool cover 70. Thus, the rotational movement of the circular saw blade 16 can be well maintained. That is, for example, even when the shielding portion 63 is omitted in the saw cover 60, the air flow AR2 and the air flow AR3 for cooling the dust box 80 can be exhausted to the tool accommodation area 70A of the tool cover 70. However, in this case, there is a risk that the chips inserted into the dust chamber 80A will be discharged from the box side exhaust port 84E into the tool accommodation area 70A (around the circular saw blade 16). If they are discharged, there is a risk that the inner peripheral side of the tool cover 70 will be deformed or damaged due to the heat of the chips or the chips rebounding from contacting the rotating circular saw blade 16. In addition, in this case, the rotational movement of the circular saw blade 16 may be poor due to the deformation or damage of the tool cover 70. As a result, there is a risk that the reliability of the cutting tool 10 will be reduced.

[0221] In contrast, in the present embodiment, the tool storage area 70A inside the tool cover 70 is divided into a working area 70B and a non-working area 70C by the shielding portion 63, and the upper part of the circular saw blade 16 is stored in the working area 70B. Therefore, even if the chips inserted into the dust collecting chamber 80A are temporarily discharged from the box side exhaust port 84E to the non-working area 70C, the shielding portion 63 can prevent the chips from hitting the inner wall of the circular saw blade 16 or the working area 70B. Thus, compared with the above-mentioned case, the damage to the inner peripheral surface of the tool cover 70 can be suppressed. Therefore, the rotation of the circular saw blade 16 can be well maintained, and the reliability of the cutting tool 10 can be improved. In addition, the box side exhaust port 84E is located above the rear portion 63D of the shielding portion 63, but since the rear portion 63D is inclined downward, even if the chips move from the box side exhaust port 84E to the upper surface of the shielding portion 63, the chips will be guided backward due to the inclined surface shape and the effect of their own weight. Furthermore, since the rear end of the rear portion 63D is located behind the rear end of the circular saw blade 16, the chips can be discharged from the non-operating area 70C by the guidance of the rear portion 63D in a manner that avoids contact with the circular saw blade 16. In addition, since the limiting portion 22E is located in front of the box-side exhaust port 84E, the chips that have invaded the non-operating area 70C are prevented from moving to the area in front of the box-side exhaust port 84E. The button insertion portion 61C supporting the dust box 80 is located in front of the box-side exhaust port 84E, and the button insertion portion 61C and its surroundings can be prevented from being deformed or damaged by the chips.

[0222] In addition, the lower part of the circular saw blade 16 is covered by the protective cover 54, and when the cutting tool 10 performs the cutting process, the protective cover 54 rotates from the protective position to the working position and is arranged in the working area 70B of the tool cover 70. Therefore, even if the chips inserted into the dust collecting chamber 80A are temporarily discharged from the box side exhaust port 84E to the non-working area 70C, the shielding portion 63 can prevent the chips from directly hitting the protective cover 54. Therefore, the thermal deformation of the protective cover 54 caused by the chips can be suppressed. Therefore, the malfunction of the protective cover 54 rotating between the protective position and the working position can be reduced.

[0223] In addition, the shielding portion 63 is formed integrally with the saw cover 60. Thus, the shielding portion 63 that partitions the tool storage area 70A of the tool cover 70 can be easily formed.

[0224] In the present embodiment, the shielding portion 63 is formed in the saw cover 60 , but the shielding portion may be formed in the inner housing 84 of the dust box 80 to partition the tool storage area 70A of the tool cover 70 into the working area 70B and the non-working area 70C.

Claims

1. A working machine, comprising: A motor drives a top tool for cutting the workpiece forward; a fan, wherein the fan is driven to rotate by the motor; A tool cover covering at least a portion of the top tool; as well as A dust box connected to the tool cover, The dust box comprises: an air intake portion, disposed at the front side of the center position of the dust box in the front-rear direction, so that the air flow generated by the rotation of the fan or the air flow generated by the cutting process flows into the interior of the dust box; and The exhaust part is arranged at the rear side of the center position of the dust box in the front-rear direction, so that the air flowing into the dust box flows to the outside of the dust box for exhaust. The air intake portion and the air exhaust portion are separated in the front-rear direction, and an air passage connecting the air intake portion and the air exhaust portion is formed in the dust box so as to extend in the front-rear direction.

2. The working machine according to claim 1, The tool cover includes an air supply portion connected to the air intake portion, and the air flow generated by the fan and the air flow generated by the cutting process are sent to the air intake portion by the air supply portion.

3. A working machine comprising: A motor drives a top tool for cutting the workpiece forward; a fan, driven to rotate by the motor; A tool cover covering at least a portion of the top tool; as well as A dust box connected to the tool cover, The tool cover is provided with an air supply unit, and the air supply unit supplies the air flow generated by the rotation of the fan and the air flow generated by the cutting process to the dust box. The dust box has: The casing has a dust collecting chamber inside for collecting the processed pieces generated during the cutting process; An air intake portion, disposed at the front side of the center of the dust box in the front-rear direction, connected to the air supply portion and allowing the air flow to flow into the dust collecting chamber; as well as The exhaust part is arranged at the rear side of the center position of the dust box in the front-rear direction, so that the air flowing into the dust collecting chamber flows to the inner side of the tool cover for exhaust. The air intake portion and the exhaust portion are separated in the front-rear direction, and an air passage connecting the air intake portion and the exhaust portion is formed in the dust box so as to extend in the front-rear direction. The working machine includes an air passage configured so that the air flow generated by the fan flows into the dust box through the air intake portion and is exhausted from the exhaust portion to the inside of the tool cover.

4. The working machine according to claim 3, wherein: The air supply unit has: a first air supply outlet portion, which allows the air generated by the fan to flow out toward the air inlet portion without passing through the working space of the top tool in the tool cover; as well as The second air supply outlet allows the air generated by the cutting process to flow out toward the air intake portion.

5. The working machine according to claim 4, wherein: At least a portion of the first air supply outlet is located above or in front of the second air supply outlet.

6. The working machine according to claim 4, wherein: The first air supply outlet portion and the second air supply outlet portion are arranged adjacent to each other.

7. The working machine according to claim 6, wherein: The first air supply outlet portion and the second air supply outlet portion open in the same direction.

8. The working machine according to claim 4, wherein: The dust box includes a guide portion that guides the air flow flowing from the air intake portion into the dust collecting chamber downward. The first air supply outlet is arranged on the upper side of the second air supply outlet, The air flow flowing out from the first air supply outlet portion to the air intake portion is guided downward by the guide portion.

9. The working machine according to claim 4, wherein: The second air outlet is communicated with the interior of the tool cover. The air supply unit includes a duct for dividing the air flow. The duct comprises: a first duct exhaust portion, which exhausts one of the air flows after diversion toward the first air supply outlet portion; and a second duct exhaust portion, which exhausts the other air flow after diversion toward the interior of the tool cover, and the other air flow after diversion is exhausted toward the second air supply outlet portion by the second duct exhaust portion.

10. The working machine according to claim 9, wherein: The top tool is a circular saw blade. The second duct exhaust portion is arranged radially inward of an outer shape of the circular saw blade when viewed in the plate thickness direction of the circular saw blade.

11. The working machine according to claim 9 or 10, wherein: A first rectifying portion is provided between the second air supply outlet portion and the second duct exhaust portion, and the first rectifying portion rectifyes the air flow exhausted from the second duct exhaust portion toward the second air supply outlet portion.

12. The working machine according to claim 1 or 4, wherein: The top tool is a circular saw blade, and the tool cover is configured to cover the upper portion of the circular saw blade. The dust box has a vertical dimension set to be smaller than a front-rear dimension.

13. The working machine according to claim 1 or 4, wherein: The top tool is a circular saw blade. The air intake portion is located further forward than the rotation center of the circular saw blade. The exhaust portion is located rearward of a rotation center of the circular saw blade.

14. The working machine according to claim 13, wherein: The air intake portion is located further back than the front end of the circular saw blade. The exhaust portion is located forward of a rear end of the circular saw blade.

15. The working machine according to claim 1 or 4, wherein: A base for sliding on the workpiece is provided below the tool cover. The dust collecting box is installed on one side of the tool cover in the left and right directions.

Images