Work machine

Abstract

The present application provides a kind of working machine, can improve assembly property.In grinder (10), paddle rod (62) is rotatably connected with rear housing (26).In addition, rotatable shaft (62G) is integrally formed on paddle rod (62) and rotatably supported on rear housing (26), and stopper for limiting the rotation range of paddle rod (62) is integrally formed on rear housing (26).Moreover, rear housing (26) and paddle rod (62) are respectively composed of single component.Therefore, the assembly property of grinder (10) can be improved.

Description

Technical Field

[0001] This invention relates to a work machine. Background Technology

[0002] In the electric grinder (working machine) described in Patent Document 1 below, the housing constituting the outer outline of the electric grinder comprises a gear cover, a motor housing (first housing), and a tail cover (second housing), which are arranged in sequence along the front-to-back direction. Furthermore, the front end of a switch lever (rod), which serves as the operating part of the electric grinder, is rotatably connected to the motor housing. On the other hand, the rear end of the switch lever engages with the tail cover, thereby limiting the rotation range of the switch lever. Moreover, when the switch lever is operated, it rotates around its front end, pressing the switch inside the tail cover. Thus, the motor within the motor housing is driven, thereby enabling the electric grinder to operate.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2011-167812 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] Here, in the electric grinding machine, the tail cover is divided into two parts, left and right. Therefore, when assembling the switch lever into the housing, the front end of the switch lever needs to be connected to the motor housing, the rear end of the switch lever needs to engage with the divided tail cover, and the two tail cover parts need to be assembled together and then assembled onto the motor housing. Thus, the assembly of the components in the electric grinding machine becomes complex, and there is room for improvement in terms of productivity related to assembly. Furthermore, as another issue, when the switch is operated by moving the switch lever, internal structures (electrical assembly parts), such as wiring, may interfere with the movement of the switch lever, thereby hindering the operation of the switch.

[0008] In view of the aforementioned facts, the present invention aims to provide a work machine that improves assembly reliability. As another objective, it aims to provide a work machine that effectively maintains the operation of a switch lever.

[0009] Technical means to solve the problem

[0010] One or more embodiments of the present invention are a working machine, characterized by comprising: a first housing housing a motor; a second housing connected to the first housing and housing a switch for turning the motor on / off; a paddle having a rotating shaft rotatably connected to the second housing and turning the switch on by rotating it from an initial position to an operating position; and a stop integrally formed with one of the second housing and the paddle, engaging with the other of the second housing and the paddle, thereby limiting the rotation range of the paddle, wherein the paddle and the second housing are each a single component.

[0011] One or more embodiments of the present invention are a working machine, wherein the stop portion extends to the other side of the second housing and the paddle rod, a locking portion is formed at the front end of the stop portion, and a hole for inserting the stop portion is formed in the other of the second housing and the paddle rod, and a locked portion is formed in the hole that engages with the locking portion in the extending direction of the stop portion.

[0012] One or more embodiments of the present invention are a working machine, wherein the stop portion is disposed on the second housing and the hole portion is formed on the propeller rod.

[0013] One or more embodiments of the present invention are a working machine, wherein the propeller extends in the axial direction of the motor, the rotation axis is axial in an orthogonal direction orthogonal to the extension direction of the propeller, a pair of stops arranged in the orthogonal direction are disposed on the second housing, and a pair of holes arranged in the orthogonal direction are formed on the propeller.

[0014] One or more embodiments of the present invention are a working machine in which a disconnecting locking member is rotatably provided on the paddle shaft. In the locked position of the disconnecting locking member, the disconnecting locking member abuts against the second housing, thereby restricting the rotation of the paddle shaft in the initial position. By rotating the disconnecting locking member to the unlocked position, the paddle shaft is allowed to rotate from the initial position to the operating position. The hole and the disconnecting locking member are arranged in the orthogonal direction.

[0015] One or more embodiments of the present invention are a working machine, wherein the rotating shaft is inserted into the support hole of the second housing by snap-fit ​​to be rotatably connected to the second housing, and at least one of the rotating shaft and the second housing is provided with an inclined portion to facilitate the snap-fit.

[0016] One or more embodiments of the present invention are a working machine having a spring that applies force to the propeller in the operating position to bring it to the initial position, a spring locking part for holding the spring and a switch working part protruding toward the second housing for operating the switch, wherein at least a portion of the spring locking part and the switch working part are located at the same position in the extending direction of the propeller.

[0017] One or more embodiments of the present invention are a working machine in which the switch is held on the first housing, and the first housing and the second housing are assembled in such a way that the switch can be operated by the paddle by connecting the second housing in the state of holding the paddle rod to the first housing in the state of holding the switch.

[0018] One or more embodiments of the present invention are a working machine, comprising: a first housing housing a motor; a switch supported by the first housing and for turning the motor on / off; a propeller having a rotation shaft rotatably connected to a second housing, and for turning the switch on by rotating it from an initial position to an operating position; and a stop integrally formed with one of the second housing and the propeller, engaging with the other of the second housing and the propeller to limit the rotation range of the propeller, wherein the second housing is configured to be assembled from the first housing in a state supporting the propeller to a state supporting the switch.

[0019] The effects of the invention

[0020] According to one or more embodiments of the present invention, assembly performance can be improved. Attached Figure Description

[0021] Figure 1 This is a side view of the disc grinding machine according to this embodiment, viewed from the left.

[0022] Figure 2 It means Figure 1 The rear of the disc grinder shown is viewed from below.

[0023] Figure 3 It means Figure 1 The image shows a side cross-section of the interior of a disc grinder, viewed from the left.

[0024] Figure 4 Viewed from below Figure 2 The bottom view of the rear housing is shown.

[0025] Figure 5 It is a schematic representation for connection. Figure 3The wiring diagram shown is viewed from below, depicting the wiring status of the motor-side wires and the board-side wires of the motor and control board.

[0026] Figure 6 (A) means to Figure 2 A cross-sectional view from the front showing the rear housing stop inserted into the propeller rod stop insertion portion. Figure 2 (Sectional view along line 6A-6A) Figure 6 (B) is viewed from the upper left. Figure 6 (A) is a perspective view of the stop portion being inserted into the stop insertion portion.

[0027] Figure 7 It means to Figure 2 The cross-sectional view from the front shows the propeller shaft inserted into the support hole of the rear housing. Figure 2 (Sectional view along line 7-7).

[0028] Figure 8 (A) is viewed from above. Figure 2 The plan view of the propeller shaft shown is as follows. Figure 8 (B) is viewed from the left side. Figure 8 Side view of the propeller shaft of (A).

[0029] Figure 9 It means Figure 8 The cross-sectional view of the middle part of the propeller shaft along the long side, viewed from the upper right.

[0030] Figure 10 This diagram illustrates the process of installing the propeller shaft.

[0031] Figure 11 It means Figure 1 The side view of the operating mechanism of the disc grinder shown is viewed from the left.

[0032] Explanation of symbols

[0033] 6A-6A, 7-7: Line

[0034] 10: Disc Grinding Machine (Operating Machinery) (Grinding Machine)

[0035] 20: Shell

[0036] 22: Motor housing

[0037] 22A: Motor Housing Section

[0038] 22B: Expanded diameter section

[0039] 22C: Bearing housing section

[0040] 22D: Holder fixing part

[0041] 22E: Step difference part

[0042] 24: Gear housing

[0043] 24A: Base

[0044] 24B: Protruding part

[0045] 26: Rear housing

[0046] 26A: Substrate housing section

[0047] 26A1: Wiring Containment Area

[0048] 26A2: Pole working area

[0049] 26B: Protrusion

[0050] 26C: Surrounding the wall

[0051] 26D: Pole housing

[0052] 26E: Flexion

[0053] 26F: Stop section

[0054] 26F1: Reinforcing Rib

[0055] 26F2: Connecting part

[0056] 26G: Contact part

[0057] 26H: Through hole

[0058] 26J: Spring mounting section

[0059] 26K: Spring-loaded locking part

[0060] 26L: Support section

[0061] 26M: Support hole

[0062] 26N: Inclined surface of the casing side

[0063] 26P: Restriction Rib

[0064] 26R: Intake port

[0065] 28: Substrate holder

[0066] 28A: Fixed part

[0067] 28B: Fixed boss

[0068] 30: Motor

[0069] 31: Rotation axis

[0070] 32: Rotor

[0071] 33: Stator

[0072] 35: First motor bearing

[0073] 36: Second motor bearing

[0074] 38A, 38B, 38C: Motor-side wires

[0075] 39: Connector

[0076] 40A, 40B, 40C: Substrate-side conductive lines

[0077] 42: Fan

[0078] 44: Small gear

[0079] 50: Transmission mechanism

[0080] 51: Output shaft

[0081] 51A: Tool Installation Department

[0082] 52: Bearing

[0083] 53: Grinding stone

[0084] 53A: Mounting hole

[0085] 54: Bevel gear

[0086] 55: Wheel guards

[0087] 60: Operating Mechanism Department

[0088] 62: Paddle shaft

[0089] 62A: Bottom wall

[0090] 62B: Zhoubi

[0091] 62C: Bar step difference section

[0092] 62D: Grip section

[0093] 62E: Main body of the rod

[0094] 62F: Flexion

[0095] 62G: Rotating shaft

[0096] 62H: Axial inclined surface

[0097] 62J: Stop Insertion Part

[0098] 62J1: Insertion Hole

[0099] 62J2: The part that was stuck

[0100] 62K: Spring seat

[0101] 62L: Spring-loaded locking part

[0102] 62M: Configuration Hole

[0103] 62N: Bearing section

[0104] 62P: Bearing groove

[0105] 62R: Switching Unit

[0106] 62R1: Work Breakthrough

[0107] 64: Rod-applying spring

[0108] 66: Disconnect the locking component

[0109] 66A: Locking support section

[0110] 68: Locking spring

[0111] 70: Linkage rod

[0112] 70A: Rod connection part

[0113] 72: Rod Holder

[0114] 80: Control Department

[0115] 82: Control board

[0116] 84: Switch

[0117] 84A: Switch body

[0118] 84B: Bar section

[0119] 84C: Switching section

[0120] 86: Switching element

[0121] 88: Power cord

[0122] FR, RH, UP: Arrows

[0123] N: Nut

[0124] P1, P2: Support pins

[0125] SC1, SC2: Fixing screws Detailed Implementation

[0126] Hereinafter, the disc grinding machine 10 (hereinafter simply referred to as grinding machine 10), which is the working machine of this embodiment, will be described using the accompanying drawings. Furthermore, the arrows UP, FR, and RH appropriately shown in the drawings represent the upper side, front side, and right side of the grinding machine 10, respectively. Moreover, in the following description, when using the directions of up / down, front / back, and left / right, unless otherwise specified, they will be used to represent the up / down direction, front / back direction, and left / right direction of the grinding machine 10. Additionally, the left / right direction corresponds to the orthogonal direction of this invention.

[0127] The grinding machine 10 is configured as a tool for performing cutting or grinding operations on materials. For example... Figures 1-3 As shown, the grinding machine 10 includes the following components: a housing 20, a motor 30, a transmission mechanism 50, an operating mechanism 60, and a control unit 80. The structure of the grinding machine 10 will be described below.

[0128] (Regarding housing 20) Housing 20 forms the outline of the grinding machine 10 and is generally formed as a hollow, approximately cylindrical shape extending in the front-rear direction. Housing 20 includes: a motor housing 22 forming the middle portion of housing 20 as a first housing, a gear housing 24 forming the front end portion of housing 20, and a rear housing 26 forming the rear end portion of housing 20 as a second housing. In addition, a substrate holder 28 for holding the control board 82 of the control unit 80 (described later) is provided inside the rear housing 26.

[0129] <Regarding the motor housing 22> The motor housing 22 is formed into a generally cylindrical shape with the rear-to-rear direction as the axial direction. Furthermore, the interior of the motor housing 22 is configured as a motor housing section 22A for housing the motor 30, which will be described later. An expanded diameter section 22B extending radially outward is formed at the front end of the motor housing 22; the expanded diameter section 22B is generally rectangular in shape when viewed from the front. The fan 42, which will be described later, is housed within the expanded diameter section 22B.

[0130] A bearing housing portion 22C for accommodating the second motor bearing 36 (described later) is formed inside the rear end of the motor housing 22. The bearing housing portion 22C is formed in a generally cylindrical shape with the rear-to-rear direction as its axial direction and is coaxially arranged with respect to the motor housing 22. Furthermore, the bearing housing portion 22C is connected to a side wall portion of the motor housing 22 via connecting ribs (not shown) provided around the bearing housing portion 22C. Additionally, inside the rear end of the motor housing 22, radially outward from the bearing housing portion 22C, a pair of upper and lower holder fixing portions 22D for fixing the substrate holder 28 (described later) are formed. The holder fixing portions 22D are formed in a generally cylindrical shape with the rear-to-rear direction as its axial direction and are connected to the bearing housing portion 22C and the motor housing 22. Furthermore, an internal thread is formed on the inner circumference of the holder fixing portion 22D.

[0131] When viewed from the side, the rear end of the motor housing 22 tilts forward as it faces downward. A stepped portion 22E is formed on the outer periphery of the rear end of the motor housing 22, and the stepped portion 22E descends one step radially inward from the outer periphery of the motor housing 22. Furthermore, the stepped portion 22E is formed throughout the entire circumference of the rear end portion of the motor housing 22.

[0132] <Regarding the gear housing 24> The gear housing 24 has a base 24A constituting the rear end portion of the gear housing 24. The base 24A is formed on the motor housing 22 in a generally rectangular cylindrical shape corresponding to the expanded diameter portion 22B. Furthermore, the expanded diameter portion 22B is inserted into the base 24A, and the outer periphery of the base 24A is fixed to the expanded diameter portion 22B at a position not shown. In addition, a protrusion 24B is formed in the gear housing 24, extending forward from the base 24A. The protrusion 24B is generally triangular in shape when viewed from the side and opens downward.

[0133] <Regarding substrate holder 28> as follows Figure 3 , Figure 5 ,and Figure 6 As shown in (A), the substrate holder 28 is formed as a generally elongated box shape that opens downward and extends in the front-rear direction. On the front wall of the substrate holder 28, a pair of fixed portions 28A are formed at positions corresponding to the holder fixing portion 22D of the motor housing 22. The fixed portions 28A are formed as generally cylindrical with the front-rear direction as the axial direction. Furthermore, the fixing screw SC1 is inserted into the interior of the fixed portion 28A from the rear side and screwed into the internal thread of the holder fixing portion 22D, thereby fixing the substrate holder 28 to the motor housing 22.

[0134] A fixing boss 28B is formed at the rear end of the substrate holder 28 for fixing the rear housing 26 (described later) to the motor housing 22 (see reference). Figure 5 The fixing boss 28B is formed in a generally cylindrical shape with the front-to-back direction as the axis, and an internal thread is formed on the inner circumference of the fixing boss 28B. The fixing screw SC2 can be screwed into the fixing boss 28B. As will be described later, the rear housing 26 can be fixed to the motor housing 22 by using the fixing screw SC2 to fix the rear housing 26 to the base plate holder 28 fixed to the motor housing 22.

[0135] <Regarding the rear housing 26> as follows Figures 1 to 7As shown, the rear housing 26 is made of resin and is formed into a generally bottomed cylindrical shape that opens to the front. The interior of the rear housing 26 is configured as a substrate receiving portion 26A. A fixing hole (not shown) is formed through the rear wall of the rear housing 26 at a position corresponding to the fixing boss 28B of the substrate holder 28. A fixing screw SC2 is inserted from the rear side into the fixing hole and screwed into the fixing boss 28B, thereby fixing the rear housing 26 to the substrate holder 28. Furthermore, in the fixed state, the front end of the rear housing 26 is inserted into the step portion 22E of the rear end of the motor housing 22. That is, the substrate holder 28 fixes the rear housing 26 and also functions as a member for connecting the rear housing 26 to the motor housing 22. Additionally, the front end face of the rear housing 26 is inclined forward as it faces downward when viewed from the side.

[0136] A downwardly protruding portion 26B is formed at the rear end of the rear housing 26. When viewed from the side, the protruding portion 26B is generally trapezoidal in shape. Furthermore, on the lower outer periphery of the rear housing 26, a downwardly protruding surrounding wall 26C is formed in front of the protruding portion 26B. When viewed from below, the surrounding wall 26C is generally U-shaped and open to the front. The space enclosed by the surrounding wall 26C is configured as a rod receiving portion 26D for accommodating the propeller rod 62 (described later). The rod receiving portion 26D is open to the downward and front sides. Additionally, bent portions 26E are formed in the middle of the left and right sidewalls of the surrounding wall 26C in the front-rear direction. When viewed from below, the bent portions 26E are bent into a generally crank-like shape, and the width dimension (left-right dimension) of the front portion of the rod receiving portion 26D is set to be greater than the width dimension of the rear portion of the rod receiving portion 26D. When viewed from the side, the paddle 62, described later, is located above the lower end of the connecting protrusion 26B and the rear end of the grinding stone 53 in a straight line, thus preventing the paddle 62 from contacting the ground or the like.

[0137] like Figure 2 , Figure 4 ,and Figure 6 As shown, a pair of left and right stop portions 26F are formed on the lower outer periphery of the rear housing 26 at the front end of the rod receiving portion 26D. The pair of stop portions 26F are arranged symmetrically with respect to the center of the rear housing 26 in the left-right direction. The stop portions 26F are formed into a generally elongated strip shape with the thickness direction in the left-right direction and extending in the vertical direction, and extend downward from the rear housing 26.

[0138] A reinforcing rib 26F1 is formed at the rear end of the stop portion 26F. The reinforcing rib 26F1 protrudes outward from the stop portion 26F in the left-right direction and extends in the vertical direction. That is, in the right-side stop portion 26F, the reinforcing rib 26F1 protrudes to the right, and in the left-side stop portion 26F, the reinforcing rib 26F1 protrudes to the left. Furthermore, an engaging portion 26F2 is formed at the front end (lower end) of the stop portion 26F. The engaging portion 26F2 protrudes outward from the stop portion 26F in the left-right direction, and its rear end connects to the reinforcing rib 26F1.

[0139] like Figure 4 As shown, on the lower outer periphery of the rear housing 26, an abutment portion 26G is formed between a pair of stop portions 26F. The abutment portion 26G is configured to abut against the release locking member 66 described later. When viewed from below, the abutment portion 26G is formed in a generally U-shaped form that opens to the front and protrudes downward from the rear housing 26.

[0140] Furthermore, a through hole 26H is formed on the outer periphery of the rear housing 26, extending through the rear side of the left-side stop portion 26F. That is, the through hole 26H is positioned to the left of the center of the rear housing 26 in the left-right direction. When viewed from below, the through hole 26H is roughly rectangular in shape with its long side in the rear-right direction, and is adjacent to the inner side of the side wall surrounding the wall 26C in the left-right direction. Furthermore, on the outer periphery of the rear housing 26, a rod-applying spring 64 (described later) is formed on the rear side of the abutment portion 26G for mounting the outer periphery of the rear housing 26. Figure 3 The rear housing 26 has a pair of spring mounting portions 26J on the left and right sides. When viewed from below, the spring mounting portions 26J are roughly L-shaped, opening inwards to the front and left and right, and protrude downwards from the rear housing 26. In addition, on the outer periphery of the rear housing 26, a spring locking portion 26K is formed between the pair of spring mounting portions 26J. When viewed from below, the spring locking portion 26K is roughly cross-shaped (+ mark) and protrudes downwards from the rear housing 26.

[0141] like Figure 2 , Figure 4 ,and Figure 7 As shown, a pair of left and right support portions 26L are formed at the rear end of the sidewall surrounding the wall 26C, supporting the propeller 62 (described later) so that it can rotate. The pair of left and right support portions 26L are inseparable. The support portion 26L protrudes further inward in the left and right direction than the inner circumferential surface surrounding the wall 26C. A circular support hole 26M is formed through the support portion 26L in the left and right direction. Furthermore, on the inner side of the support portion 26L in the left and right direction, a shell-side inclined surface 26N, which serves as an inclined portion, is formed below the support hole 26M. When viewed from the front and rear direction, the shell-side inclined surface 26N is inclined outward in the left and right direction as it faces downward.

[0142] like Figure 5 , Figure 6 (A) and Figure 7 As shown, a limiting rib 26P, serving as a limiting portion, is formed on the inner peripheral surface of the lower side of the rear housing 26. The limiting rib 26P extends along the thickness direction in the left-right direction and along the front-back direction. Specifically, the limiting rib 26P is disposed adjacent to the right side of the through hole 26H and protrudes upward from the inner peripheral surface of the rear housing 26. In addition, the front end of the limiting rib 26P is located to the right of the middle part in the front-back direction of the through hole 26H, and the rear end of the limiting rib 26P is connected to the rear wall of the rear housing 26. Thus, the lower end of the substrate receiving portion 26A is separated by the limiting rib 26P in the left-right direction. Specifically, the area on the right side of the lower end of the substrate receiving portion 26A relative to the limiting rib 26P is configured as a wiring receiving area 26A1 (see reference). Figure 6 (A)), the area on the left side of the lower end of the substrate receiving portion 26A relative to the limiting rib 26P is configured as the rod working area 26A2 (see reference). Figure 6 (A)).

[0143] like Figure 1 As shown, multiple air intake ports 26R are formed through the left and right sides of the rear housing 26. The air intake ports 26R are arranged in groups of multiple air intake ports 26R arranged in a generally vertical direction, and the five groups of air intake ports 26R are arranged in a front-back direction.

[0144] (Regarding motor 30) as follows Figure 3 and Figure 5 As shown, the motor 30 is configured as a three-phase brushless motor and is housed in the motor housing 22A of the motor housing 22. The motor 30 is configured as a rotor 32 and a stator 33, and a rotating shaft 31 is mounted on the rotor 32.

[0145] The rotating shaft 31 is axially arranged in the back-to-back direction. Furthermore, the front end of the rotating shaft 31 is supported by a first motor bearing 35 fixed to the gear housing 24 for rotation, and the rear end of the rotating shaft 31 is supported by a second motor bearing 36 fixed to the bearing housing 22C of the motor housing 22 for rotation. The rotor 32 is arranged radially outward of the rotating shaft 31 and is configured to rotate integrally with the rotating shaft 31.

[0146] The stator 33 is formed in a generally cylindrical shape with the rear-to-rear direction as the axial direction, and is supported on the motor housing 22 radially outside the rotor 32. The stator 33 has a stator holder, and stator coils corresponding to the U-phase, V-phase, and W-phase of the motor 30 are wound in the stator holder. Motor-side wires 38A, 38B, and 38C (see reference) are connected to the ends of the stator coils corresponding to the U-phase, V-phase, and W-phase, respectively, serving as electrical components and wiring. Figure 5One end of the wires (with gray coating) is located. Motor-side wires 38A, 38B, and 38C are disposed below the bearing housing 22C of the motor housing 22 and within the wiring housing area 26A1 of the rear housing 26. That is, motor-side wires 38A, 38B, and 38C extend in the front-to-back direction within the wiring housing area 26A1 of the rear housing 26. Furthermore, the other ends of the motor-side wires 38A, 38B, and 38C are connected via connector 39 to the board-side wires 40A, 40B, and 40C (see reference 40A, 40B, and 40C), which are electrical components and wiring. Figure 5 The substrate-side wires 40A, 40B, and 40C are connected to the control board 82 of the control unit 80 (described later). Thus, the motor 30 is driven by the control unit 80. Furthermore, the substrate-side wires 40A, 40B, and 40C, like the motor-side wires 38A, 38B, and 38C, are also arranged in the wiring receiving area 26A1.

[0147] like Figure 3 As shown, a fan 42 is integrally rotatable on the front end side of the rotating shaft 31, behind the first motor bearing 35. The fan 42 is configured as an axial flow fan. Specifically, it is configured to generate an airflow from the rear to the front. This allows air to flow into the housing 20 from the intake port 26R of the rear housing 26 and to be discharged from the exhaust port (not shown) of the protrusion 24B formed in the gear housing 24. Therefore, the airflow generated by the fan 42 is used to cool the control unit 80 and the motor 30, which will be described later.

[0148] Furthermore, the front end of the rotating shaft 31 is housed within the protrusion 24B of the gear housing 24, and a pinion 44 is fixed to the front end of the rotating shaft 31. The teeth of the pinion 44 are inclined radially inward toward the rotating shaft as it faces forward.

[0149] (Regarding the transmission mechanism 50) The transmission mechanism 50 has an output shaft 51 with the vertical direction as the axial direction, and the output shaft 51 is housed in the protrusion 24B of the gear housing 24. Moreover, the middle part of the output shaft 51 in the vertical direction is supported by a bearing 52 fixed to the gear housing 24 so that it can rotate.

[0150] The lower end of the output shaft 51 is configured as a tool mounting portion 51A, and an external thread is formed on the outer periphery of the tool mounting portion 51A. Furthermore, a grinding stone 53, configured as a circular plate, is mounted on the tool mounting portion 51A. Specifically, the mounting hole 53A of the grinding stone 53 is inserted into the tool mounting portion 51A, and a nut N is screwed into the tool mounting portion 51A, thereby mounting the grinding stone 53 on the tool mounting portion 51A. A portion of the outer periphery of the grinding stone 53 is partially covered by a guard wheel cover 55. The guard wheel cover 55 is configured to allow for arbitrary changes to the portion of the grinding stone 53. Figure 1 and Figure 3 In its current state, it is located at the rear of the covered grinding stone 53. A gap is provided between the front end of the paddle 62 (described later) and the wheel guard 55, large enough to accommodate one finger but not two.

[0151] A bevel gear 54 is fixed at the upper end of the output shaft 51, and the bevel gear 54 meshes with the pinion 44. Thus, the output shaft 51 is driven by the motor 30, and the rotation of the motor 30 is transmitted to the output shaft 51, causing the grinding stone 53 to rotate around the axis of the output shaft 51.

[0152] (Regarding the operating mechanism section 60) as follows Figures 1-3 and Figure 6 As shown, the operating mechanism 60 is composed of a paddle rod 62 as a lever, a disconnect locking member 66, and a linkage rod 70.

[0153] <Regarding paddle 62> Figure 8 and Figure 9 As shown, the paddle shaft 62 is made of resin and is formed into a generally rectangular concave shape that opens upward and extends in the front-rear direction. Specifically, the paddle shaft 62 includes a bottom wall 62A and a peripheral wall 62B that protrudes upward from the outer periphery of the bottom wall 62A. A rod step portion 62C is formed in the middle of the bottom wall 62A in the front-rear direction. When viewed from the side, the rod step portion 62C is bent into a generally crank shape and tilts upward as it faces forward. Furthermore, the portion of the paddle shaft 62 further forward than the rod step portion 62C is configured as a rod grip portion 62D, and the portion of the paddle shaft 62 further rearward than the rod step portion 62C is configured as a rod body portion 62E (the center portion of the rod). The rod grip portion 62D is configured as the part to be gripped by the user, and the wall thickness of the rod grip portion 62D is set to be thinner than the wall thickness of the rod body portion 62E. Additionally, a pair of bent portions 62F are formed on the left and right sides of the middle part of the peripheral wall 62B in the front-rear direction, on the rear side of the rod step portion 62C. When viewed from below, the bent portions 62F are bent into a roughly crank shape, and the width dimension (the dimension in the left-right direction) of the rear end portion of the rod body portion 62E is set to be smaller than the width dimension of other parts.

[0154] like Figure 7 As shown, a pair of left and right rotating shafts 62G are formed at the rear end of the side wall of the peripheral wall 62B. The rotating shafts 62G are formed into approximately cylindrical shapes with the left-right direction as the axial direction, protruding from the peripheral wall 62B outward in the left-right direction (outward in the width direction of the propeller 62). Furthermore, the rear end of the propeller 62 is received within the rod receiving portion 26D of the rear housing 26, and the rotating shafts 62G are inserted into the support hole 26M of the rear housing 26 from the left-right direction inward, and are rotatably supported in the support hole 26M. Thus, the propeller 62 can be rotatably connected to the rear housing 26. Specifically, the propeller 62 is configured such that in the initial position ( Figure 1The position shown by the solid line in the middle is the same as the operating position when viewed from the left, rotated clockwise from the initial position. Figure 1 The propeller 62 rotates between the positions indicated by the double-dotted lines. Furthermore, in the initial position, the propeller 62 tilts downwards as it moves forward, and in the operating position, the propeller 62 is set to approximately horizontal. Additionally, with the propeller 62 connected to the rear housing 26, the rod grip 62D extends forward from the rod receiving portion 26D and is positioned on the lower side of the motor housing 22. This allows the operator to operate the propeller 62 while gripping the motor housing 22, which does not have an air intake 26R.

[0155] An inclined surface 62H, serving as an inclined portion, is formed on the upper part of the front end face of the rotating shaft 62G. When viewed from the front-rear direction, the inclined surface 62H tilts inward in the left-right direction as it faces upward. Therefore, when the propeller 62 is assembled onto the rear housing 26, the rotating shaft 62G is positioned below the housing-side inclined surface 26N of the rear housing 26 (see reference). Figure 7 The propeller shaft 62 (shown by the double-dotted line) is pressed upwards, causing the shaft-side inclined surface 62H to slide on the housing-side inclined surface 26N. This causes the peripheral wall 62B of the propeller shaft 62 and the surrounding wall 26C of the rear housing 26 to flex, thereby embedding the rotating shaft 62G into the support hole 26M. In other words, through a so-called snap-fit ​​engagement, the rotating shaft 62G can be rotatably embedded into the support hole 26M. Thus, the housing-side inclined surface 26N and the shaft-side inclined surface 62H are configured as functional parts that facilitate the snap-fit ​​engagement of the rotating shaft 62G with the support hole 26M.

[0156] On the bottom wall 62A of the propeller shaft 62, a pair of left and right stop insertion portions 62J are formed on the rear side of the shaft step portion 62C. The stop insertion portions 62J are positioned corresponding to the stop portion 26F of the rear housing 26. The stop insertion portions 62J are formed into a generally rectangular cylindrical shape with the vertical direction as the axial direction, and the outer walls in the left and right directions of the stop insertion portions 62J are formed by peripheral walls 62B. The interior of the stop insertion portions 62J is configured as an insertion hole 62J1, which is a through hole in the vertical direction. At the upper opening of the stop insertion portions 62J, a locking portion 62J2 is provided at the front and outer corner in the left and right directions. The locking portion 62J2 is formed into a generally rectangular plate shape with the vertical direction as the plate thickness direction and the front and back directions as the long side direction. Thus, the upper opening of the stop insertion portions 62J is formed into a generally L-shaped form. In other words, in the upper opening of the stop insertion part 62J, the front side is partially blocked by the engaging part 62J2, thus narrowing in the left and right direction and widening in the rear side.

[0157] Moreover, such as Figure 6 (A) and Figure 6As shown in (B), the stop portion 26F of the rear housing 26 is inserted into the insertion hole 62J1 of the stop insertion portion 62J from the upper opening of the stop insertion portion 62J. Furthermore, with the stop portion 26F inserted into the stop insertion portion 62J, the stop portion 26F is positioned inside the engaged portion 62J2 in the left-right direction, and the engaging portion 26F2 of the stop portion 26F is adjacent to the lower side of the engaged portion 62J2. Thus, the engaging portion 26F2 and the engaged portion 62J2 engage (abut) in the vertical direction, thereby restricting the downward rotation of the propeller 62 in its initial position. That is, the propeller 62 is in a state where the engaging portion 26F2 and the engaged portion 62J2 are engaged in the initial position. Furthermore, the stop portion 26F is clamped in the left-right direction by the inner peripheral surface of the stop insertion portion 62J (specifically, the inner peripheral surface in the left-right direction) and the engaging portion 62J2. Therefore, the displacement of the stop portion 26F in the left-right direction is restricted by the stop insertion portion 62J and the engaging portion 62J2. That is, the left and right stop portions 26F are configured to suppress the swaying, deformation, or deflection of the propeller rod 62 in the left-right direction.

[0158] like Figure 3 , Figure 8 ,and Figure 9 As shown, a spring seat 62K is formed at the rear of the bottom wall 62A of the propeller 62. The spring seat 62K is located further rearward than the stop insertion portion 62J and at the center of the propeller 62 in the left-right direction. The spring seat 62K is formed into a generally cylindrical shape with the vertical direction as the axial direction, and protrudes upward from the bottom wall 62A. Furthermore, a rod-applying spring 64 (see reference) is mounted on the spring seat 62K. Figure 3 The lever-applying spring 64 is configured as a compression coil spring, with its lower end locked in the spring seat 62K. On the other hand, the upper end of the lever-applying spring 64 is positioned between a pair of spring mounting portions 26J of the rear housing 26 and locked in the rear housing 26. Thus, the force applied by the lever-applying spring 64 applies downward force to the propeller shaft 62, keeping it in its initial position. Furthermore, a spring locking portion 62L is formed on the upper surface of the spring seat 62K, and when viewed from above, the spring locking portion 62L is approximately cross-shaped (+ mark). Moreover, the spring locking portion 26K of the rear housing 26 and the spring locking portion 62L of the propeller shaft 62 are disposed inside the lever-applying spring 64, thereby restricting the movement of the lever-applying spring.

[0159] Here, use Figure 6 and Figure 10 The operation of mounting the propeller 62 onto the rear housing 26 will be explained. Figure 10 This diagram illustrates the process of mounting the propeller 62 onto the rear housing 26. To mount the propeller 62 onto the rear housing 26, firstly, the stop portion 26F is positioned inside the stop insertion portion 62J, as shown... Figure 10 As shown in (A), the engaging part 26F2 is inserted into the upper opening of the stop insertion part 62J. At this time, the upper opening of the stop insertion part 62J is partially blocked by the engaging part 62J2, and the engaging part 26F2 cannot pass through the blocked area. Therefore, the engaging part 26F2 is inserted from the rear opening of the upper opening of the stop insertion part 62J, which is not partially blocked by the engaging part 62J2. Therefore, when the engaging part 26F2 is inserted into the upper opening of the stop insertion part 62J, the propeller 62 is located in the position of... Figure 2 The assembly position is slightly forward relative to the rear housing 26. Therefore, when the engaging part 26F2 is inserted into the upper opening of the stop insertion part 62J, the rotating shaft 62G and the support hole 26M are in a front-to-back separated state, and they are not in a positional relationship that can engage.

[0160] Next, as Figure 10 As shown in (B), by moving the propeller 62 rearward relative to the rear housing 26, the engaging portion 26F2 is positioned below the engaged portion 62J2. At this time, as... Figure 6 As shown in (B), the reinforcing rib 26F1 is located behind the engaging portion 62J2, which inhibits the propeller 62 from moving more than the required distance backward. That is, in addition to improving the durability of the stop portion 26F itself, the reinforcing rib 26F1 also functions as an auxiliary component when assembling the propeller 62 into the rear housing 26.

[0161] Finally, as the propeller 62 moves rearward, the rotating shaft 62G and the support hole 26M are in the same position in the front-rear direction, thus achieving a positional relationship where they can engage with each other. By pressing the rotating shaft 62G upward (towards the rear housing 26) from this state, the rotating shaft 62G engages with the support hole 26M through the aforementioned snap-fit ​​engagement. Figure 10 (as shown in (C)). Just before the engagement and fitting ( Figure 7 The position of the propeller shaft 62 (indicated by the double-dotted line) restricts the movement of the propeller shaft 62 in the direction of separation (downward) from the rear housing 26, except that the movement is restricted by the engagement of the engaged portion 62J2 and the engaged portion 26F2. Furthermore, with the axial inclined surface 62H abutting against the housing inclined surface 26N, the front and rear sides of the cylindrical rotating shaft 62G abut against the support portion 26L. This restricts the movement of the rotating shaft 62G in the front-rear direction, thus limiting the relative movement of the propeller shaft 62 relative to the rear housing 26 in the downward and front-rear directions. Therefore, it is easier to assemble the propeller shaft 62 by pressing it upward to engage it, improving assemblability. In other words, because it has engaging portions (engaged portion 62J2, engaged portion 26F2) that restrict the relative movement (separation) of the propeller shaft 62 from the rear housing 26 when it is engaged and fitted into the rear housing 26, assembly is easier.

[0162] Returning to the description of the structure of the propeller shaft 62, a mounting hole 62M for mounting the disconnecting locking member 66 (described later) is formed through a pair of stop insertion portions 62J on the bottom wall 62A of the propeller shaft 62. The mounting hole 62M is generally rectangular in shape when viewed from above. Furthermore, a pair of left and right bearing portions 62N are formed on the bottom wall 62A of the propeller shaft 62. The bearing portions 62N are positioned between the mounting hole 62M and the stop insertion portions 62J, and protrude upwards from the bottom wall 62A. A bearing groove 62P is formed in the bearing portion 62N, and the bearing groove 62P faces upwards and is open inwards in the left and right directions. Additionally, a support pin P1 (see reference) is mounted on the pair of bearing portions 62N with the left and right direction as the axial direction. Figure 6 (A) and Figure 6 (B)) The two ends of the long side of the support pin P1 are embedded into the lower end of the bearing groove 62P.

[0163] A switch working part 62R for activating the switch 84 (described later) is provided on the peripheral wall 62B on the left side of the propeller 62. The switch working part 62R is formed into a generally rectangular column with the vertical direction as the axis, and extends upward from the peripheral wall 62B. In addition, the upper part of the switch working part 62R is inserted into the insertion hole 26H of the rear housing 26 from the lower side, and is disposed in the rod working area 26A2 of the rear housing 26. That is, the switch working part 62R is disposed adjacent to the left side of the limiting rib 26P. A working protrusion 62R1 is formed at the upper end of the switch working part 62R, and the working protrusion 62R1 protrudes forward from the switch working part 62R.

[0164] <Regarding the disconnection of locking component 66> Figure 2 , Figure 3 ,and Figure 6 As shown, the disconnect locking member 66 is formed as a generally rectangular plate with its thickness along the front-to-back direction, and bends into a generally crank shape when viewed from the left-to-right direction. Specifically, the upper end of the disconnect locking member 66 is positioned further forward than the lower end of the disconnect locking member 66. A locking support portion 66A protruding forward is formed in the middle of the vertical direction of the disconnect locking member 66. Furthermore, the disconnect locking member 66 is disposed within the mounting hole 62M of the propeller 62, and the locking support portion 66A is rotatably supported by the support pin P1. That is, the disconnect locking member 66 is rotatably connected to the propeller 62, and the disconnect locking member 66 and a pair of stop insertion portions 62J are arranged in the left-to-right direction.

[0165] Furthermore, a locking spring 68 configured as a torsion spring is installed on the support pin P1. When viewed from the left, the locking spring 68 applies force to the disengaging locking member 66 in a counterclockwise direction. Moreover, when the disengaging locking member 66 is connected to the propeller 62, the lower end of the disengaging locking member 66 protrudes further downward than the propeller 62. Thus, by the force applied by the locking spring 68, the lower part of the disengaging locking member 66 abuts against the rear of the mounting hole 62M, thereby holding the disengaging locking member 66 in the locked position. Figure 3 (The position is shown in solid line). Furthermore, in the locked position of the disengaged locking member 66, the upper end of the disengaged locking member 66 is positioned close to the lower side of the abutment portion 26G of the rear housing 26. Therefore, the configuration is such that when the propeller 62 is to be rotated from the initial position to the operating position, the rotation of the propeller 62 from the initial position to the operating position is prevented because the upper end of the disengaged locking member 66 abuts against the abutment portion 26G.

[0166] On the other hand, when the unlocking member 66 is rotated clockwise from the locked position, the upper end of the unlocking member 66 is displaced downward relative to the abutment portion 26G. Figure 3 The position indicated by the double-dotted line (hereinafter referred to as the unlocked position) is thus configured such that by rotating the unlocking member 66 to the unlocked position, the paddle rod 62 is allowed to rotate from the initial position to the operating position side.

[0167] <Regarding linkage 70> Figure 11 As shown, the linkage 70 is formed into a generally elongated strip extending in the front-rear direction and is disposed in the rear housing 26 (in Figure 11 (Not shown in the diagram) Within the working area 26A2 of the lever. Specifically, the rear end of the linkage 70 is disposed adjacent to the upper side of the switching working part 62R of the propeller lever 62, and the linkage 70 extends across the motor housing 22 (in... Figure 11 The linkage rod 70 is configured such that its rear end (not shown) and the front end of the rear housing 26 are connected. The front end of the linkage rod 70 is connected to a rod holder 72 located inside the motor housing 22. Specifically, a support pin P2 with the left-right direction as the axial direction is provided on the rod holder 72, and the front end of the linkage rod 70 is rotatably supported on the support pin P2.

[0168] A rod connection portion 70A is formed at the rear end of the linkage 70. The rod connection portion 70A protrudes downward from the linkage 70 and bends backward. Furthermore, the working protrusion 62R1 of the propeller 62 is inserted between the rear end of the linkage 70 and the rod connection portion 70A. Therefore, since the linkage 70 and the propeller 62 engage (abut) in both vertical directions, when the propeller 62 rotates between the initial position and the operating position, the linkage 70 is configured to rotate in conjunction with the rotation of the propeller 62, rotating about the axis of the support pin P2. Specifically, in the initial position of the propeller 62, the linkage 70 is positioned in a non-pressed position (…). Figure 11 As shown in the diagram, in the operating position of the paddle lever 62, the linkage 70 is positioned in the pressing position after rotating upwards from the non-pressed position (illustration omitted). Due to the aforementioned engagement relationship, when the paddle lever 62 is in the initial position, the linkage 70 is also in the downward rotating position (…). Figure 11 (in the non-pressed position), thus it can suppress the state in which the switch part 84C is pressed (described later).

[0169] (Regarding Control Unit 80) as follows Figure 3 and Figure 5 As shown, the control unit 80 has a control substrate 82, which is formed into a generally rectangular plate with the vertical direction as its thickness direction and the front-back direction as its long side direction. The control substrate 82 is disposed inside the substrate holder 28 and held on the substrate holder 28. Specifically, the control substrate 82 is housed in the upper part of the substrate housing portion 26A of the rear housing 26. As a result, the limiting rib 26P of the rear housing 26 is disposed on the lower side (thickness direction side) of the control substrate 82.

[0170] A switch 84, an electrical component, is provided on the lower surface (one side) of the control board 82 for turning the motor 30 on / off. The switch 84 is located on the upper side of the front part of the linkage 70 (see reference). Figure 11 Specifically, in the vertical direction, the limiting rib 26P of the rear housing 26 is configured to face a portion (right end) of the switch 84, and the left side of the switch 84 is configured to face the linkage rod 70 (see reference). Figure 6 (A)).

[0171] The switch 84 is configured as a lever switch. Specifically, the switch 84 includes: a switch body 84A mounted on the control board 82, a lever portion 84B rotatably connected to the switch body 84A, and a switch portion 84C pressed by the lever portion 84B. Furthermore, the lever portion 84B abuts against the upper surface of the linkage rod 70 (see reference). Figure 11 Thus, the linkage 70 and the paddle 62 are rotated together, rotating from the non-pressed position to the pressed position, thereby pressing the switch part 84C of the switch 84, thereby switching the switch 84 from open to closed.

[0172] Furthermore, the substrate-side conductors 40A, 40B, and 40C are connected to the control substrate 82, which is electrically connected to the motor 30. A plurality of (six in this embodiment) switching elements 86, serving as electrical components, are provided on the lower surface (one side) of the control substrate 82. These switching elements 86 are electrically connected to the stator coils of the motor 30 via motor-side conductors 38A, 38B, and 38C, and substrate-side conductors 40A, 40B, and 40C. Additionally, the switching elements 86 constitute an inverter circuit that switches the energization state of the stator coils in the motor 30.

[0173] The switching elements 86 are configured in groups of three, with each group of three switching elements 86 arranged in a front-to-back direction. Furthermore, two groups of switching elements 86 are arranged in a left-to-right direction. Specifically, the two groups of switching elements 86 are located to the right of the switch 84 and the limiting rib 26P. Consequently, the motor-side wires 38A, 38B, and 38C and the substrate-side wires 40A, 40B, and 40C, which are located in the wiring receiving area 26A1, are positioned below the switching elements 86.

[0174] Furthermore, the switching element 86, located on the left side (switch 84 side), is positioned close to the right side of the switch 84 and the limiting rib 26P. Moreover, the front end (lower end) of the switching element 86 is positioned lower than the front end (upper end) of the limiting rib 26P. That is, when viewed from the left-right direction, the front end of the switching element 86 overlaps with the front end of the limiting rib 26P. Thus, the switching element 86 and the limiting rib 26P are configured to restrict the movement of motor-side wires 38A, 38B, 38C and substrate-side wires 40A, 40B, 40C from the wiring receiving area 26A1 to the rod working area 26A2. In this embodiment, the limiting rib 26P is configured to overlap with the switching element 86, which has a particularly high height; however, it could also be configured to overlap with electrical components such as a smoothing capacitor or a rectifier diode bridge. Furthermore, the gap between the front end of the switching element 86 in the left-right direction and the front end of the limiting rib 26P is configured to be smaller than the thickness of the motor-side wires 38A, 38B, 38C and the substrate-side wires 40A, 40B, 40C. This prevents these wires from passing between the switching element 86 and the limiting rib 26P, and more preferably, prevents the wires from moving towards the rod working area 26A2.

[0175] Additionally, a power cord 88 is connected to the control board 82, extending rearward from the rear end of the rear housing 26. The power cord 88 is configured to connect to an AC power source, thereby supplying power to the motor 30.

[0176] (Effects and Effects) Next, the function and effects of the grinding machine 10 in this embodiment will be explained.

[0177] In the non-operating state of the grinding machine 10 configured as described above, the paddle 62 is positioned in the initial position, and the linkage 70 is positioned in the non-pressed position. Furthermore, in this state, the locking member 66 is positioned in the locked position. Therefore, rotation of the paddle 62 towards the operating position can be prevented by disengaging the locking member 66.

[0178] When the grinding machine 10 is in operation, the locking member 66 is rotated from the locked position to the unlocked position. This allows the paddle rod 62 to rotate from the initial position to the operating position. In this state, when the paddle rod 62 is rotated from the initial position to the operating position, the linkage 70 is linked to the rotation of the paddle rod 62, rotating from the non-pressed position to the pressed position, thereby switching the switch 84 from off to on. As a result, the motor 30 is driven by the control unit 80. Specifically, the rotation shaft 31 of the motor 30 rotates, and the output shaft 51 of the transmission mechanism 50 rotates. As a result, the grinding stone 53 mounted on the output shaft 51 rotates. Therefore, cutting or grinding can be performed on the workpiece.

[0179] Here, in the grinding machine 10, a rotating shaft 62G is integrally provided on the paddle 62, and the rotating shaft 62G is rotatably connected to the rear housing 26. Furthermore, a stop portion 26F for limiting the rotation range of the paddle 62 is integrally formed on the rear housing 26. Moreover, the rear housing 26 and the paddle 62 are each constructed from a single component. This improves the assembleability of the grinding machine 10.

[0180] That is, assuming a structure in which the rear housing 26 is divided into two parts along the left-right direction and the front end of the propeller 62 is connected to the motor housing 22 (hereinafter, this case will be referred to as the comparative example grinding machine), it is necessary to connect the front end of the propeller 62 to the motor housing 22, and simultaneously engage the stop portion 26F with the propeller 62 while assembling the two parts of the rear housing 26. In other words, in the comparative example grinding machine, it is necessary to assemble the propeller 62 onto both the motor housing 22 and the rear housing 26. Furthermore, in the comparative example grinding machine, it is necessary to assemble the two parts of the rear housing 26. Therefore, in the comparative example grinding machine, the assembly becomes complicated, and the assembly efficiency may be reduced.

[0181] In contrast, in the grinding machine 10 of this embodiment, the rear housing 26 and the paddle 62 are constructed from a single component, and the paddle 62 is rotatably connected to the rear housing 26. Therefore, by engaging the paddle 62 with the stop portion 26F of the rear housing 26 while simultaneously connecting it to the rear housing 26, the paddle 62 and the rear housing 26 can be modularized. That is, it is not necessary to assemble the paddle 62 onto both the motor housing 22 and the rear housing 26 as in the comparative example grinding machine. Furthermore, since the rear housing 26 is constructed from a single component, it is not necessary to assemble the two parts of the rear housing 26 together as in the comparative example grinding machine. As a result, assembly time can be significantly reduced compared to the comparative example grinding machine. Moreover, the modular rear housing 26 and the paddle 62 can be assembled onto the motor housing 22. Therefore, the assembleability of the grinding machine 10 can be improved.

[0182] Furthermore, in this embodiment, since the rear housing 26 is constructed from a single component, the volume of the substrate receiving portion 26A of the rear housing 26 can be increased compared to a structure in which the rear housing 26 is divided, and this contributes to the miniaturization of the polishing machine 10. That is, assuming the rear housing 26 is divided in the left-right direction, a fixing portion is needed inside or outside the rear housing 26 to fix the two parts of the rear housing 26 together. Moreover, when the fixing portion is provided inside the rear housing 26, the volume of the substrate receiving portion 26A tends to decrease. Conversely, when the fixing portion is provided outside the rear housing 26, the polishing machine 10 tends to become larger. In contrast, in this embodiment, as described above, at least a portion (the rear housing 26) constituting the housing of the polishing machine 10 is constructed from an indivisible single component, and this portion is configured as a support portion supporting the propeller 62 of the single component. That is, the housing constituting the polishing machine 10 has an indivisible support portion for supporting the propeller 62, which has a rotating shaft integrally formed. Therefore, it is not necessary to place the fixing part inside or outside the rear housing 26. Therefore, compared with the structure after dividing the rear housing 26, the volume of the substrate receiving part 26A of the rear housing 26 can be increased, and it can help to reduce the size of the grinding machine 10.

[0183] Furthermore, in this embodiment, the switch 84, pressed by the propeller 62, is supported on the motor housing 22, and the propeller 62 is supported on the rear housing 26. Thus, the rear housing 26, with the propeller 62 supported, can be assembled onto the motor housing 22, with the switch 84 (board holder 28) supported. That is, since the rear housing 26, which is modularized with the propeller 62, can be assembled onto the motor housing 22, which is modularized with electrical components such as the switch 84, the two units can be operated during assembly to form a connection, and the fixing screw SC2 can be screwed into the fixing boss 28B via the rear housing 26. In other words, assembly can be performed through simple operations such as screwing the two parts together, resulting in excellent assemblability. Therefore, the control board 82 and the electrical components mounted on it are configured so as not to interfere with the assembly of the rear housing 26. More specifically, the configuration is such that when the rear housing 26 is connected to the rear housing 22 by moving towards the rear (from rear to front) of the motor housing 22 to accommodate the control board 82, the inner surface or limiting ribs 26P of the rear housing 26 does not interfere with the control board 82 and the electrical components (switching elements 86, etc.) mounted thereon due to contact, but this does not hinder assembly. Furthermore, in this embodiment, the rear housing 26 is treated as a single component to reduce the number of parts; however, the improved assemblability resulting from the two modular designs is achieved even if the rear housing 26 is a segmented housing, achieving the same effect.

[0184] Furthermore, in this embodiment, the rear end of the paddle 62 is rotatably connected to the rear housing 26, and the handle 62D constituting the front end of the paddle 62 is disposed on the lower side of the motor housing 22. Therefore, the workability of the grinder 10 can be improved. That is, assuming the front end of the paddle 62 is rotatably connected to the motor housing 22, the rear end of the paddle 62 is configured as a handle for the user to hold. Here, in the grinder 10, a grinding stone 53 is mounted at the front end. Therefore, when the grinder 10 is in operation, the user can hold the front end of the grinder 10 (near the grinding stone 53), thus improving the workability of the paddle 62. Moreover, if the rear end of the paddle 62 is configured as a handle, the workability of the grinder 10 may decrease if the user operates the paddle 62 while holding the rear end of the grinder 10. In contrast, in this embodiment, the rear end of the paddle 62 is rotatably connected to the rear housing 26, and the rod grip 62D constituting the front end of the paddle 62 is disposed on the lower side of the motor housing 22. Therefore, the user can operate the paddle 62 while holding the front end of the grinder 10. This improves the workability of the grinder 10. In particular, since there are no air intakes or other ventilation openings in the motor housing 22, the possibility of clogging the ventilation openings during operation can be prevented.

[0185] Furthermore, a stop portion 26F of the rear housing 26 extends from the rear housing 26 toward the propeller 62 side (lower side), and a locking portion 26F2 protruding outward in the left-right direction is formed at the front end of the stop portion 26F. Additionally, a stop insertion portion 62J is formed on the propeller 62, and the front end of the stop portion 26F is inserted into the stop insertion portion 62J (insertion hole 62J1). Furthermore, a locked portion 62J2 is formed in the stop insertion portion 62J, and the locking portion 26F2 and the locked portion 62J2 are locked in the vertical direction. Thus, a simple structure can be used to limit the downward rotation of the propeller 62 at its initial position.

[0186] Furthermore, the stop portion 26F is clamped in the left-right direction by the inner peripheral surface (inner side in the left-right direction) of the insertion hole 62J1 and the engaging portion 62J2. Therefore, the stop portion 26F can be prevented from being pulled out of the stop insertion portion 62J by the inner peripheral surface of the stop insertion portion 62J. That is, for example, when a downward external force is applied to the rod grip portion 62D of the propeller 62, the engaging portion 62J2 of the propeller 62 presses the engaging portion 26F2 downward. At this time, the engaging portion 26F2 protrudes outward in the left-right direction from the stop portion 26F, and therefore, due to the pressing force input to the engaging portion 26F2, the stop portion 26F will bend and deform inward in the left-right direction. Here, the stop portion 26F is clamped in the left-right direction by the inner peripheral surface (inner side in the left-right direction) of the insertion hole 62J1 and the engaging portion 62J2. Therefore, when the stop portion 26F is about to flex and deform, the stop portion 26F abuts against the inner circumferential surface of the stop insertion portion 62J, thereby suppressing the flexural deformation of the stop portion 26F. Thus, the engagement state between the stop portion 26F and the propeller rod 62 can be well maintained.

[0187] Furthermore, a stop portion 26F is provided on the rear housing 26, and a stop insertion portion 62J is formed on the propeller rod 62. Therefore, compared to a structure in which the stop insertion portion 62J (insertion hole 62J1) is formed on the rear housing 26, the rigidity of the rear housing 26 can be improved. In addition, it can suppress the intrusion of dust generated during cutting into the rear housing 26.

[0188] Furthermore, a pair of stop portions 26F are provided on the rear housing 26, and a pair of stop insertion portions 62J are formed on the propeller shaft 62. Moreover, the pair of stop insertion portions 62J are arranged in a left-right direction (orthogonal to the extending direction of the propeller shaft 62). Therefore, when the engaging portion 26F2 of the stop portion 26F and the engaged portion 62J2 of the stop insertion portion 62J are engaged, the stress acting on the engaging portion 26F2 and the engaged portion 62J2 can be distributed to two locations. As a result, the engagement state between the stop portion 26F and the propeller shaft 62 can be well maintained while suppressing the annual changes of the engaging portion 26F2 and the engaged portion 62J2.

[0189] Furthermore, a disconnect locking member 66 is rotatably provided on the propeller 62 to prevent or allow rotation of the propeller 62 in its initial position. The disconnect locking member 66 is disposed between a pair of stop inserts 62J, and the disconnect locking member 66 and the pair of stop inserts 62J are arranged in a left-right direction. Specifically, the mounting hole 62M for mounting the disconnect locking member 66, the bearing portion 62N for supporting the disconnect locking member 66, and the pair of stop inserts 62J are arranged in a left-right direction. Thus, the propeller 62 can be divided into a main body portion 62E with the mounting hole 62M, the bearing portion 62N, and the stop inserts 62J, and a grip portion 62D for the user to hold. Thus, while ensuring the strength of the propeller 62 by making the wall thickness of the main body portion 62E thicker, the area of ​​the thinner grip portion 62D is expanded to ensure the operability of the propeller 62.

[0190] Furthermore, a housing-side inclined surface 26N is formed on the support portion 26L surrounding the wall 26C in the rear housing 26, and a shaft-side inclined surface 62H is formed on the rotation shaft 62G of the propeller 62. Therefore, when the rotation shaft 62G is assembled into the support hole 26M, the rotation shaft 62G, positioned below the housing-side inclined surface 26N of the rear housing 26, is pressed upwards. This causes the shaft-side inclined surface 62H to slide on the housing-side inclined surface 26N, resulting in flexural deformation of the peripheral wall 62B of the propeller 62 and the surrounding wall 26C of the rear housing 26, thereby embedding the rotation shaft 62G into the support hole 26M. Thus, the housing-side inclined surface 26N and the shaft-side inclined surface 62H facilitate the engagement of the rotation shaft 62G with the support hole 26M. Therefore, the assembly stability of the propeller 62 into the rear housing 26 is further improved. In particular, in this embodiment, the rotational restriction and support of the propeller 62 can be provided solely by the rear housing 26 as a single component. Therefore, no special tools are required, and the propeller 62 can be easily assembled to the rear housing 26 without tools. Furthermore, since the motor housing 22 does not participate in supporting the propeller 62, the propeller 62 can be assembled onto the rear housing 26 while it is supported by the motor housing 22, after assembling the rear housing 26 before supporting the propeller 62. Thus, this embodiment is also highly assemblable in terms of ensuring assembly flexibility.

[0191] Furthermore, a control board 82 is housed in the rear housing 26. A limiting rib 26P is provided on the inner circumferential surface of the lower part of the rear housing 26, protruding upwards (towards the control board 82). Thus, the limiting rib 26P can separate the lower part of the interior of the rear housing 26 (board housing portion 26A) in the left-right direction. Specifically, the limiting rib 26P can separate the lower part of the board housing portion 26A into a wiring housing area 26A1 and a lever working area 26A2. Therefore, the limiting rib 26P can restrict the movement of electrical components (in this embodiment, motor-side wires 38A, 38B, 38C and board-side wires 40A, 40B, 40C) disposed in the wiring housing area 26A1, which is separated from the component mounting surface of the control board 82, towards the lever working area 26A2. Furthermore, the limiting rib 26P is integrally formed with the rear housing 26. Therefore, for example, compared to a structure in which separate partition plates are placed on the substrate holder 28, the assembly capability of the grinding machine 10 can be improved while suppressing the increase in the number of parts.

[0192] Furthermore, the control substrate 82 is formed as a rectangular plate with the longitudinal direction as its long side, and the limiting rib 26P extends along the longitudinal direction (axial direction of the motor 30) on the lower side of the control substrate 82. Therefore, the space of the substrate receiving portion 26A can be separated by the limiting rib 26P extending along the longitudinal direction of the control substrate 82.

[0193] Furthermore, the rear housing 26 is disposed on the rear side of the motor housing 22 (on the axial side of the motor 30), and the motor-side wires 38A, 38B, 38C and the substrate-side wires 40A, 40B, 40C extend in the front-rear direction within the substrate receiving portion 26A. Moreover, the motor-side wires 38A, 38B, 38C and the substrate-side wires 40A, 40B, 40C are positioned to the right relative to the limiting rib 26P. Therefore, the limiting rib 26P can restrict the movement of the motor-side wires 38A, 38B, 38C and the substrate-side wires 40A, 40B, 40C in the left-right direction due to vibration, etc. As a result, the motor 30 can be connected to the control board 82 while suppressing the left-right movement of the motor-side wires 38A, 38B, 38C and the substrate-side wires 40A, 40B, 40C.

[0194] Furthermore, a switch 84 for turning the motor 30 on / off is provided on the lower surface of the control board 82, and the switch 84 (right end) and the limiting rib 26P are arranged facing each other in the vertical direction. Therefore, it is possible to prevent the motor-side wires 38A, 38B, 38C and the board-side wires 40A, 40B, 40C, whose movement is limited by the limiting rib 26P, from contacting the switch 84. Thus, for example, it is possible to prevent the switch 84 from malfunctioning.

[0195] Furthermore, a switching element 86 is provided on the lower surface of the control board 82. Motor-side wires 38A, 38B, 38C, board-side wires 40A, 40B, 40C, and the switching element 86 are positioned to the right relative to the limiting rib 26P and the switch 84. That is, the switching element 86 and the switch 84 are arranged in a left-right direction, and the limiting rib 26P, motor-side wires 38A, 38B, 38C, and board-side wires 40A, 40B, 40C are also arranged in a left-right direction. Therefore, the limiting rib 26P and the switching element 86 can restrict the movement of motor-side wires 38A, 38B, 38C and board-side wires 40A, 40B, 40C to the left (towards the lever working area 26A2). This effectively prevents the motor-side wires 38A, 38B, 38C and board-side wires 40A, 40B, 40C from contacting the switch 84.

[0196] Furthermore, when viewed from the left and right, the front end (lower end) of the switching element 86 overlaps with the front end (upper end) of the limiting rib 26P. Therefore, a so-called labyrinth structure can be formed between the switching element 86 and the limiting rib 26P. This more effectively restricts the movement of the motor-side wires 38A, 38B, 38C and the substrate-side wires 40A, 40B, 40C to the left (towards the lever working area 26A2). Therefore, it more effectively suppresses contact between the motor-side wires 38A, 38B, 38C and the substrate-side wires 40A, 40B, 40C and the switch 84.

[0197] Furthermore, the switch working part 62R of the propeller 62 is inserted into the insertion hole 26H of the rear housing 26 and disposed within the working area 26A2 of the propeller 62. Moreover, the insertion hole 26H is disposed adjacent to the left side of the limiting rib 26P. That is, the switch working part 62R is disposed adjacent to the left side of the limiting rib 26P. Therefore, the limiting rib 26P can suppress the contact between the motor-side wires 38A, 38B, 38C and the substrate-side wires 40A, 40B, 40C and the switch working part 62R. Thus, while suppressing the influence of the motor-side wires 38A, 38B, 38C and the substrate-side wires 40A, 40B, 40C on the operation of the switch working part 62R, the motor-side wires 38A, 38B, 38C, the substrate-side wires 40A, 40B, 40C, and the switch working part 62R are arranged in a left-right direction.

[0198] Furthermore, in this embodiment, a stop portion 26F is provided in the rear housing 26, and a stop insertion portion 62J is formed in the propeller 62. Alternatively, the stop portion 26F may be provided in the propeller 62, and the stop insertion portion 62J may be provided in the rear housing 26. Furthermore, in this embodiment, the switch 84 is configured to be supported on the motor housing 22 and housed in the rear housing 26. However, the switch 84 may also be configured to be supported and housed in another housing portion, and the contents contained in the inseparable housing portion (rear housing 26) where the propeller 62 is assembled are arbitrary. That is, the present invention is an invention that snaps and fits an inseparable propeller with a rotating shaft integrally formed onto an inseparable housing, therefore the contents contained in the housing can be arbitrarily changed. Additionally, in this embodiment, the motor housing 22 and the rear housing 26 are constructed as independent parts, but they may also be integrated into one unit. That is, it can also be configured such that the housing containing the motor and the like is constructed as an integral, inseparable whole, while the propeller 62 is fastened and fitted onto the housing.

[0199] In this embodiment, the insertion hole 62J1 through which the stop insertion portion 62J in the propeller 62 is formed is provided. Alternatively, the stop insertion portion 62J may be formed as a bottomed concave shape that opens upwards.

[0200] In addition, in this embodiment, a housing-side inclined surface 26N is formed in the support portion 26L of the rear housing 26, and a shaft-side inclined surface 62H is formed in the rotation shaft 62G of the propeller 62. However, one of the housing-side inclined surface 26N and the shaft-side inclined surface 62H may be omitted.

Claims

1. A type of operating machinery, characterized in that... include: motor; A switch to turn the motor on / off; A first housing houses the motor and supports the switch behind the motor; The second housing, connected to the first housing, has a wall extending downward from the outer periphery, and the second housing is formed as a generally bottomed cylindrical shape that houses a switch that turns the motor on / off. The wall has a support portion, and a support hole is formed in the support portion through a left-right direction that intersects the front-back direction. The paddle has a rotating shaft that can be rotatably inserted into the support hole and extends in the left-right direction, and the switch is turned on by rotating about the rotating shaft from the initial position to the operating position. as well as The stop portion is integrally formed with one of the second housing and the propeller shaft, and engages with the other of the second housing and the propeller shaft, thereby limiting the rotation range of the propeller shaft. The switch is supported by the first housing. The propeller shaft and the second housing are each individual components. Through the support hole and the stop, the rotation of the propeller shaft can be limited and supported by the second housing alone. A through hole running vertically is formed on the bottom of the second housing. The propeller rod is provided with a switch working part, which extends from the outside of the second housing through the through hole into the inside of the second housing, so as to turn the switch on / off. The second housing is configured such that it can be assembled to the first housing that supports the switch, with the wall supporting the propeller and a portion of the switch working part located inside.

2. The working machinery according to claim 1, wherein the stop portion extends to the other side of the second housing and the paddle rod, and a locking portion is formed at the front end of the stop portion. A hole is formed in the second housing and the other of the propeller for the stop to be inserted, and an engaging portion is formed in the hole that engages with the engaging portion in the extending direction of the stop.

3. The working machine according to claim 1, wherein the linkage rod is supported by the first housing, the action of the switch working part is transmitted to the switch via the linkage rod, and the linkage rod is configured to actuate by pressing the switch working part, and the actuated linkage rod presses the switch.

4. The working machinery according to claim 2, wherein the propeller extends axially in the motor, and the rotation axis has an axial direction orthogonal to the extension direction of the propeller. A pair of stops arranged in the orthogonal direction are disposed on the second housing, and a pair of holes arranged in the orthogonal direction are formed on the propeller shaft.

5. The working machinery according to claim 4, wherein a disconnecting locking member is rotatably provided on the paddle shaft. In the locked position of the disconnect locking member, the disconnect locking member abuts against the second housing, thereby restricting the rotation of the propeller rod in the initial position. By rotating the disengaging locking member to the unlocked position, the propeller is allowed to rotate from the initial position to the operating position, and The holes and the disconnect locking member are arranged in the orthogonal direction.

6. The working machinery according to any one of claims 1 to 5, wherein the rotating shaft is engaged with the support hole in the wall portion by a snap-fit ​​connection to rotatably connect with the second housing. An inclined portion is formed on at least one of the rotating shaft and the wall portion to facilitate the fastening and engagement.

7. The working machinery according to claim 1, comprising a spring that applies force to the paddle rod located in the operating position to bring it to the initial position. The propeller shaft is provided with a spring catch portion to hold the spring, and a switch working portion that protrudes toward the second housing for operating the switch. At least a portion of the spring locking part and the switch working part are located at the same position in the extension direction of the propeller.

8. The working machinery according to claim 1, wherein the second housing has a support portion for supporting the paddle rod. The propeller shaft and the support portion are respectively and inseparable. The rotating shaft is engaged with the support portion by fastening and fitting, thereby supporting the propeller shaft on the support portion.

9. The operating machinery according to claim 1, comprising: The control unit has a control board connected to the motor and is housed in the second housing; A limiting part is provided on the inner peripheral surface of the second housing, protruding toward the control substrate, and restricts the movement of electrical components connected to the control substrate. The control board and the limiting portion extend along the axial direction of the motor. The direction orthogonal to the thickness direction of the control substrate when viewed from the axial direction of the motor is defined as the orthogonal direction. The second housing is formed as an indivisible part, and the limiting portion is disposed on one side of the control substrate in the thickness direction. The second housing is disposed on one axial side of the motor relative to the first housing. The wiring connecting the control board to the motor constitutes the electrical assembly component, and extends along the axial direction of the motor inside the second housing. The wiring is disposed on one side of the orthogonal direction relative to the limiting part, and the limiting part restricts the movement of the wiring to the other side of the orthogonal direction.

10. The working machinery according to claim 9, wherein a switch for turning the motor on / off is provided on one side of the control board. The switch and the limiting part are arranged facing each other in the thickness direction of the control substrate.

11. The working machinery according to claim 10, wherein a switching element for controlling the motor is provided on one side of the control board. The wiring and the switching element are arranged on one side of the orthogonal direction relative to the limiting part and the switch.

12. The operating machinery according to claim 9, comprising: A switch for turning the motor on / off; and The switch is turned on by rotating the paddle from the initial position to the operating position; The limiting part divides the interior of the second housing into a wiring receiving area and a lever working area, wherein the wiring is arranged in the wiring receiving area, and the movement of the lever is transmitted to the switch via the lever working area.

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