Electric tool

Abstract

To improve flexibility of operation of a switch for switching a drive state of a motor to improve workability of an electric tool.SOLUTION: An electric tool includes a switch which rotates relative to a housing to switch driving of a motor. The switch has: a switch body having a first end serving as a supporting point of the rotation and a second end opposite to the first end; and at least one protruding part protruding from the switch body. When the side at which the switch is located of the housing is set to the lower side, the protruding part protrudes upward in a first state that the second end is closest to the housing.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to power tools. [Background technology]

[0002] Conventionally, there have been known power tools that are operated by the driving force of a motor, such as grinders, drills, circular saws, etc. For example, Patent Document 1 discloses a grinder that is provided with a paddle switch that is supported on a housing so as to be movable and operable. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-209956 A Summary of the Invention [Problem to be solved by the invention]

[0004] 2. Description of the Related Art In electric power tools, it is desirable to increase the degree of freedom in operating a switch that switches the drive state of a motor, thereby improving the operability of the electric power tool. [Means for solving the problem]

[0005] An electric power tool according to one embodiment of the present disclosure comprises a motor, a housing for accommodating the motor, and a switch for switching the drive of the motor by rotating relative to the housing, the switch having a switch body having a first end that serves as a fulcrum for rotation and a second end opposite the first end, and at least one protrusion protruding from the switch body, the switch body being positioned along the longitudinal direction of the housing in a first state in which the second end is closest to the housing, the side of the housing on which the switch is located being the lower side and the side of the housing opposite the lower side being the upper side, and the protrusion protruding toward the upper side in the first state. Effect of the Invention

[0006] According to one aspect of the present disclosure, the degree of freedom in operating a switch that switches the drive state of a motor can be increased, thereby improving the operability of the power tool. [Brief description of the drawings]

[0007] [Figure 1] FIG. 2 is a left side view illustrating an example of a power tool according to an embodiment. [Diagram 2] 1 is a plan view of a power tool according to an embodiment when viewed from below. FIG. [Diagram 3] FIG. 4 is a left side view illustrating an example of a first housing and a second housing according to an embodiment. [Figure 4] IV-IV line cross-sectional view of the power tool 1 shown in FIG. [Diagram 5] 2 is a cross-sectional view of the power tool 1 shown in FIG. 1 taken along line VV. [Figure 6] 6 is a cross-sectional view of the power tool 1 shown in FIG. 1 taken along line VI-VI. [Figure 7] FIG. 7 is a cross-sectional view showing a second region of FIG. 6. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, a power tool according to an embodiment of the present disclosure will be described with reference to the drawings. However, for the sake of convenience, each of the drawings referred to below shows only the main components necessary for explaining the embodiment in a simplified manner. Therefore, the power tool may include any component not shown in each of the drawings referred to in this specification. Furthermore, the dimensions of each component in each drawing do not faithfully represent the actual dimensions of the component and the dimensional ratios of each component.

[0009] In the present embodiment, a grinder equipped with a grinding wheel will be described as an example of the power tool. However, the type of the power tool according to the embodiment of the present disclosure is not particularly limited. Examples of power tools other than grinders include circular saws and drills.

[0010] [Embodiment 1] The configuration of a power tool 1 according to this embodiment will be described with reference to Fig. 1 to Fig. 5. Fig. 1 is a left side view showing an example of the power tool 1. Fig. 2 is a plan view of the power tool 1 as viewed from below. Fig. 3 is a left side view showing an example of a first housing 11 and a second housing 12. Fig. 4 is a cross-sectional view of the power tool 1 shown in Fig. 2 taken along line IV-IV. Fig. 5 is a cross-sectional view of the power tool 1 shown in Fig. 1 taken along line VV.

[0011] Reference numeral 101 in Fig. 1 and reference numeral 201 in Fig. 2 and Fig. 4 indicate the power tool 1 in an ON state in which the motor 71 is driven. Reference numeral 102 in Fig. 1 and reference numeral 202 in Fig. 4 indicate the power tool 1 in an OFF state in which the motor 71 is not driven. Reference numeral 301 in Fig. 5 is a cross-sectional view of the power tool 1 taken along line VV, and reference numeral 302 in Fig. 5 is a cross-sectional view showing a first area AR1 of reference numeral 301.

[0012] In this specification, the direction of the power tool 1 is defined as the front side, the side where the grindstone 30 is located in the longitudinal direction of the power tool 1, and the rear side, the side where the switch 50 is located. In addition, in the power tool 1, the side of the housing 10 where the switch 50 is located is defined as the lower side, and the side opposite the lower side is defined as the upper side, with the center line CL1 in between. The center line CL1 is an imaginary line segment that divides the power tool 1 into two in the vertical direction. Furthermore, the right side and the left side are defined in the state when the power tool 1 is viewed from the front side with the lower side of the housing 10 facing vertically downward. However, the above-mentioned directions are used for convenience of explanation and do not limit the direction of the power tool 1.

[0013] <Power tool configuration> 1 and 2, the power tool 1 may include a housing 10, a gear housing 20, a grinding wheel 30, a protective cover 40, a switch 50, and a locking unit 60. In addition, as shown in Figures 1 and 4, the power tool 1 may include therein a motor 71, a rotation drive unit 72, a circuit board 73, and a fan 74.

[0014] The housing 10 may be a hollow member that houses the motor 71, the circuit board 73, and the fan 74. The housing 10 may be composed of a plurality of housings. In this embodiment, as shown in FIG. 3, the housing 10 may include a first housing 11 and a second housing 12. As shown in FIG. 4, the first housing 11 may house the motor 71 and the fan 74. The second housing 12 may house the circuit board 73. As shown in FIGS. 1 and 2, in the power tool 1, the first housing 11 may be located on the front side, and the second housing 12 may be located on the rear side.

[0015] In the present embodiment, the first housing 11 may be a hollow cylindrical member, but is not limited to this. The second housing 12 may have a shape in which the outer wall surface at the connection portion with the first housing 11 is substantially flush.

[0016] As shown in Fig. 3, the first housing 11 may have a screw hole 112, and the second housing 12 may have a screw hole 122. As shown in Fig. 1, the first housing 11 and the second housing 12 may be fixed and connected to each other by attaching screws 91 to the screw holes 112 and 122. As long as the first housing 11 and the second housing 12 are connected to each other, they may be connected by a connecting member other than the screws 91, such as a locking claw.

[0017] However, the housing 10 may be integrally molded. In this case, the housing 10 may include a first member that constitutes the left side surface of the power tool 1 and a second member that constitutes the right side surface of the power tool 1. The housing 10 may be formed by connecting the first member and the second member.

[0018] The gear housing 20 may be a hollow member that stores a gear that transmits the driving force of the motor 71 to the rotation drive unit 72. In this embodiment, as shown in Fig. 4, the gear housing 20 may store a pinion gear 712 and a bevel gear 75 provided in the motor 71 as the above-mentioned gear.

[0019] The rotary drive unit 72 may be rotationally driven by the drive of the motor 71. A grindstone 30 may be attached to a lower end of the rotary drive unit 72 as a removable tool. The grindstone 30 may be rotationally driven in conjunction with the rotary drive of the rotary drive unit 72. By attaching the grindstone 30 to the power tool 1, a work object can be brought into contact with the rotary drive grindstone 30 to grind the work object.

[0020] A protective cover 40 may be attached to the underside of the gear housing 20 to protect the operator from the rotating grindstone 30. The protective cover 40 may be shaped to cover at least the rear half of the grindstone 30, for example. The protective cover 40 can reduce the risk of the operator's hand coming into contact with the rotating grindstone 30 when the operator is holding the housing 10. In addition, the protective cover 40 can reduce the risk of cutting chips or dust, etc., generated by grinding a work object with the grindstone 30 being scattered toward the operator.

[0021] The switch 50 may be a member that switches the drive of the motor 71 by rotating with respect to the housing 10. The switch 50 may be located on the lower side of the housing 10.

[0022] The switch 50 may include a switch body 51 having a first end 511 that serves as a pivot point for rotation, and a second end 512 opposite the first end 511. The first end 511 may have an axis extending in the left-right direction. This allows the switch body 51 to rotate in the up-down direction so as to move toward or away from the housing 10. The switch 50 may have a range of movement of, for example, about 10°.

[0023] As indicated by reference numeral 101 in FIG. 1, the switch body 51 may be a member that extends along the longitudinal direction of the housing 10 and has a width in the left-right direction when in contact with the housing 10. That is, the switch body 51 may be located along the longitudinal direction of the housing 10 in a first state in which the second end 512 is closest to the housing 10. In this first state, the motor 71 is in an ON state in which it is driven. On the other hand, as indicated by reference numeral 102 in FIG. 1, in a second state in which the second end 512 of the switch body 51 is farther away from the housing 10 than in the first state, the motor 71 is in an OFF state in which it is not driven.

[0024] The shape, size, and movement range of the switch 50 may be specified so as to facilitate operation for controlling the drive of the motor 71. The switch 50 may also be referred to as a paddle switch.

[0025] The locking portion 60 is a member that locks the switch 50 so that the switch 50 does not rotate. As an example, as shown in FIG. 2, the locking portion 60 may be located inside the switch body 51 in a plan view. The locking portion 60 may have an axis that extends in the left-right direction. This allows the locking portion 60 to rotate in the up-down direction so as to be in an upright state in which it stands up against the upper and lower surfaces of the switch body 51, or in a non-upright state in which it does not stand up.

[0026] Reference numeral 201 in Fig. 4 indicates the non-standing state of the lock portion 60, and reference numeral 202 in Fig. 4 indicates the standing state of the lock portion 60. As indicated by reference numeral 202 in Fig. 4, when the lock portion 60 is in the standing state, an end of the lock portion 60 may abut against the inside of the housing 10. This allows the switch body 51 to be fixed at a position separated from the housing 10. On the other hand, as indicated by reference numeral 201 in Fig. 4, when the lock portion 60 is in the non-standing state, the end of the lock portion 60 does not abut against the inside of the housing 10. This allows the switch 50 to rotate.

[0027] (Motor drive control) The motor 71 may be a member that generates a driving force. As shown in Fig. 4, the motor 71 may have a motor shaft 711. The motor 71 may rotate the motor shaft 711. The motor shaft 711 may have a pinion gear 712 at the front end.

[0028] The rotation drive unit 72 may be a member that is rotationally driven by the driving force of the motor 71. As shown in Fig. 4, the rotation drive unit 72 and the pinion gear 712 may each be connected to a bevel gear 75. As a result, the driving force of the motor 71 is transmitted to the rotation drive unit 72 via the pinion gear 712 and the bevel gear 75, and the rotation drive unit 72 may be rotationally driven in conjunction with the rotation drive of the bevel gear 75.

[0029] 4, the second housing 12 may include a first contact portion 76 and a second contact portion 77. The switch 50 may also include a protrusion 54.

[0030] The first contact portion 76 may be a member that switches the drive of the circuit board 73. The first contact portion 76 may be movable in the vertical direction and drive the circuit board 73 when located at the uppermost position. The second contact portion 77 may be a member that has an end portion that serves as a fulcrum for rotation and rotates relative to the first contact portion 76. The end portion may be located in the vicinity of the first contact portion 76. The protrusion portion 54 may be located in a position in the switch 50 that faces the second contact portion 77.

[0031] In the second state of the switch 50 shown by reference numeral 202 in FIG. 4, the first contact portion 76 may be located at the lowest position. In this state, the operator grasps the housing 10 and pushes the switch 50 upward while unlocking the switch 50 by pushing down the standing lock portion 60. Then, as the switch 50 approaches the housing 10, the protrusion portion 54 pushes up the second contact portion 77, and the first contact portion 76 moves upward with the movement of the second contact portion 77. Then, when the first contact portion 76 is located at the highest position, the circuit board 73 may be driven. When the first contact portion 76 is located at the highest position, the switch 50 may be in the first state shown by reference numeral 101 in FIG. 4. However, the first contact portion 76 may be located at the highest position before the switch 50 is in the first state.

[0032] The driving of the motor 71 may be controlled by driving the circuit board 73. This causes the rotation drive unit 72 to rotate via the pinion gear 712 and the bevel gear 75, and the grindstone 30 attached to the rotation drive unit 72 to rotate. In this state, the grindstone 30 is brought into contact with the workpiece, whereby the workpiece can be ground.

[0033] On the other hand, when the operator loosens his grip on the switch 50, the switch 50 may rotate so as to move away from the housing 10. With this rotation, the protrusion 54 also moves downward, and the second contact portion 77 may also rotate downward. As a result, the first contact portion 76 moves downward, and the drive of the circuit board 73 may be released. Therefore, the drive of the motor 71 may be released, and the rotation of the grinding wheel 30 may be stopped. Furthermore, with the rotation of the switch 50 caused by the operator loosening his grip on the switch 50, the lock portion 60 may return to the upright state. The lock portion 60 may be returned to the upright state manually.

[0034] (Other configurations) The circuit board 73 may be a board that controls the motor 71. The circuit board 73 may have a control circuit that controls a drive circuit that drives the motor 71. In this case, the housing 10 may have a circuit board that has the drive circuit.

[0035] However, circuit board 73 may be a circuit board having a drive circuit. In this case, housing 10 may have a circuit board having a control circuit. Also, circuit board 73 may be a circuit board having a control circuit and a drive circuit.

[0036] The fan 74 may be rotationally driven to generate an airflow and cool the motor 71. The fan 74 may be attached to a motor shaft 711 and thus rotated in conjunction with the rotation of the motor 71. Driving the fan 74 may cause gas to flow into the internal space of the housing 10 via the reference numeral 101 in FIG. 1 and the first intake section 111 and the second intake section 121 shown in FIG. 3.

[0037] 4, the fan 74 may be attached in front of the motor 71. In this case, the gas flowing into the housing 10 by driving the fan 74 flows along the surface of the motor 71 to the front side of the housing 10, so that the motor 71 can be efficiently cooled.

[0038] 4, the first housing 11 may include an exhaust section 114 on the front side of the first housing 11. The exhaust section 114 may be a through-hole formed in the first housing 11, which communicates the internal space of the first housing 11 with the outside. By driving the fan 74, the gas that has flowed into the internal space of the housing 10 may be exhausted to the outside of the housing 10 via the exhaust section 114.

[0039] <Specific switch configuration> 1 and 2, in the present embodiment, the switch 50 may have, in addition to a switch body 51, at least one protrusion 52 protruding from the switch body 51. As indicated by reference numeral 101 in FIG. 1, the protrusion 52 may protrude upward in the first state.

[0040] Since the switch 50 has the protrusion 52, the operator can hook his / her finger on the protrusion 52 when holding the housing 10 from above. Therefore, the operator can easily operate the switch 50 even when holding the housing 10 from above. Therefore, the operator can operate the switch 50 and perform grinding work no matter from which direction the operator holds the housing 10. In other words, according to the power tool 1 of this embodiment, the freedom of operation of the switch 50 can be increased, and the operability of the power tool 1 can be improved.

[0041] 1 and 2, the protruding portion 52 may protrude from the second end portion 512. The switch 50 rotates with the first end portion 511 as a fulcrum. Therefore, the farther the operator is from the first end portion 511 when operating the switch 50, the easier it is to operate the switch 50. Therefore, by making the protruding portion 52 protrude from the second end portion 512, the operability of the switch 50 can be improved.

[0042] As shown in FIG. 2, the switch body 51 may have a recess 53 recessed toward the first end 511 at the second end 512 from which the protruding portion 52 protrudes when the switch body 51 is viewed in plan. The recess 53 can reduce the area of ​​the switch 50, so that the operator can easily position the fingers that are not holding the switch 50 on the housing 10. Therefore, the operator can easily press the switch 50 against the housing 10, so that the motor 71 can be stably driven. In addition, since the fingers can easily be positioned on the housing 10, the operator is less likely to feel the thickness and size of the power tool 1. In this way, the switch body 51 has the recess 53 at the second end 512, so that the workability of grinding can be improved.

[0043] The switch 50 may have two protrusions 52. As shown in Fig. 2, the switch 50 may have a first protrusion 52A and a second protrusion 52B as the protrusions 52. The first protrusion 52A and the second protrusion 52B may protrude on opposite sides of a center line CL2 in a plan view of the switch body 51. The center line CL2 is an imaginary line segment passing through the first end 511 and the second end 512.

[0044] Since the first protrusion 52A and the second protrusion 52B are located on the left and right sides of the switch body 51, when an operator grasps the housing 10 from above, the operator can easily hook his / her fingers on the protrusion 52. In addition, whether the operator operates the switch 50 with the fingers of his / her right hand or the fingers of his / her left hand, the operator can easily hook his / her fingers on the protrusion 52.

[0045] As shown in FIG. 2, in a plan view of the switch 50, the first protrusion 52A and the second protrusion 52B may each protrude from the switch body 51 so as to form an acute angle with respect to the direction from the first end 511 to the second end 512.

[0046] Specifically, the angle α1 between the direction from the first end 511 to the second end 512 and the direction in which the first protruding portion 52A extends may be an acute angle. In this case, the angle α2 between the direction from the second end 512 to the first end 511 and the direction in which the first protruding portion 52A extends may be an obtuse angle. Also, the angle β1 between the direction from the first end 511 to the second end 512 and the direction in which the second protruding portion 52B extends may be an acute angle. In this case, the angle β2 between the direction from the second end 512 to the first end 511 and the direction in which the second protruding portion 52B extends may be an obtuse angle.

[0047] When the switch 50 is pressed upward, the above stress is likely to occur on and near the line segment L1 connecting the connection portion P1 between the switch body 51 and the first protrusion 52A and the connection portion P2 between the switch body 51 and the second protrusion 52B. For example, in the second state in which the switch 50 is separated from the housing 10, if a force is applied to push the switch 50 upward while the switch 50 is fixed, the above stress is likely to occur. In this embodiment, if a force is applied to push the switch 50 upward while the lock portion 60 is in the upright state, the above stress is likely to occur.

[0048] As described above, the first protruding portion 52A and the second protruding portion 52B protrude from the switch body 51 so that the angles α1, β1 are acute angles and the angles α2, β2 are obtuse angles in a plan view of the switch 50, thereby making it possible to reduce the above-mentioned stress. Therefore, it is possible to increase the durability of the switch 50, and therefore the durability of the power tool 1.

[0049] As indicated by reference numeral 101 in FIG. 1, in the first state, the tip 521 of the protrusion 52 may be located in the lower portion of the housing 10. Reference numeral 101 in FIG. 1 indicates a state in which the tip 521 of the first protrusion 52A is located in the lower portion of the housing 10. The tip 521 of the second protrusion 52B shown in FIG. 2 may also be located in the lower portion of the housing 10. The tip 521 may be the portion of the protrusion 52 that is farthest from the switch body 51. In this embodiment, the tip 521 may be the side of the protrusion 52 that is farthest from the switch body 51.

[0050] Since the tip portion 521 is located in the lower portion of the housing 10, the amount of protrusion of the protrusion 52 from the switch body 51 can be made smaller than when the tip portion 521 is located on the center line CL1 or above the center line CL1. This allows the power tool 1 to be made more compact. Furthermore, the smaller the amount of protrusion of the protrusion 52, the less susceptible the protrusion 52 is to damage. For example, the smaller the amount of protrusion, the less likely the protrusion 52 will break. This allows the durability of the protrusion 52 to be increased.

[0051] 2, in this embodiment, the switch 50 may be Y-shaped in a plan view. The switch 50 may be symmetrical with respect to a center line CL2. In this case, the first protrusion 52A and the second protrusion 52B may have the same size and shape. In addition, angles α1 and α2 between the switch body 51 and the first protrusion 52A and angles β1 and β2 between the switch body 51 and the second protrusion 52B may be the same.

[0052] However, the switch 50 does not have to be symmetrical with respect to the center line CL2. For example, the first protrusion 52A and the second protrusion 52B may have different sizes or shapes. For example, in a plan view of the switch 50, only one of the first protrusion 52A and the second protrusion 52B may protrude from the switch body 51 so as to form an acute angle with respect to the direction from the first end 511 to the second end 512. Also, for example, in the first state, only the tip 521 of the first protrusion 52A or the second protrusion 52B may be located in a lower portion of the housing 10.

[0053] 5, in the first state, the protrusion 52 may have a curved shape that follows the curved shape of the outer wall surface of the housing 10. This allows the protrusion 52 to be positioned so as to follow the outer wall surface of the housing 10 in the first state. This allows the operability of the protrusion 52 to be improved.

[0054] 5, tip portion 521 may have a shape capable of forming a gap G1 between itself and the outer wall surface of housing 10 in the first state. For example, tip portion 521 may have a shape in which the inside facing the outer wall surface of housing 10 in the first state is cut out. Also, for example, tip portion 521 may have a shape that bulges outward so as to be separated from the outer wall surface of housing 10 in the first state.

[0055] When tip portion 521 has the above-described shape, gap G1 can be formed in the first state, so that even if a finger gets between protrusion 52 and housing 10, the risk of the finger or skin being pinched between protrusion 52 and housing 10 can be reduced.

[0056] 1 and 2, the second end 512 may be positioned so as to contact the first housing 11 in the first state. Therefore, the outer wall surface may be the outer wall surface 115 of the first housing 11, as shown by reference numeral 302 in FIG.

[0057] In this embodiment, in the first state, first protrusion 52A and second protrusion 52B may each have a curved shape that follows the curved shape of outer wall surface 115. Furthermore, tip 521 of first protrusion 52A and tip 521 of second protrusion 52B may each have a shape that can form gap G1 in the first state.

[0058] However, only one of the first protruding portion 52A and the second protruding portion 52B may have a curved shape that follows the curved shape of the outer wall surface 115. In addition, only the tip portion 521 of one of the first protruding portion 52A and the second protruding portion 52B may have a shape that can form the gap G1 in the first state.

[0059] In the above description, the switch 50 has been described as having the first protruding portion 52A and the second protruding portion 52B as the protruding portion 52. However, this is not limited thereto, and the protruding portion 52 may be one. For example, the switch 50 may have one of the first protruding portion 52A and the second protruding portion 52B. Furthermore, in the above description, the protruding portion 52 has been described as protruding from the second end portion 512. However, this is not limited thereto, and the protruding portion 52 may be located midway between the first end portion 511 and the second end portion 512 of the switch body 51.

[0060] [Embodiment 2] Fig. 6 is a cross-sectional view taken along line VI-VI of the power tool 1 shown in Fig. 1. Fig. 7 is a cross-sectional view showing a second area AR2 in Fig. 6. The hollow arrows shown in Fig. 7 indicate an example of a gas flow.

[0061] Increasing the number of intake parts in the housing 10 allows for efficient cooling of the motor 71. For example, not only the first housing 11 that houses the motor 71 has an intake part, but also the second housing 12 has an intake part, allowing for efficient cooling of the motor 71.

[0062] However, second housing 12 houses circuit board 73. If second housing 12 has an intake section, there is a risk that gas may flow from the outside of second housing 12 to circuit board 73. Since the gas flowing into the internal space of second housing 12 contains dust, if the gas flows into circuit board 73, there is a risk that circuit board 73 may be damaged by the dust.

[0063] Thus, in the power tool 1, it is desirable to reduce the risk of gas flowing into the circuit board 73 while increasing the amount of gas that flows in.

[0064] In the power tool 1 of this embodiment, as shown in Fig. 1, 3 and 6, the first housing 11 may have a first air intake portion 111. Furthermore, the second housing 12 may have a second air intake portion 121.

[0065] As shown by reference numeral 101 in Fig. 1 and Fig. 3, the first housing 11 may include a plurality of first intake sections 111, and the second housing 12 may include a plurality of second intake sections 121. Also, as shown in Fig. 6, the first intake sections 111 may be located on the left and right sides of the first housing 11. The second intake sections 121 may be located on the left and right sides of the second housing 12. However, the size, shape, number, and positions of the intake sections in the housing 10 may be determined so as to efficiently cool the motor 71, taking into consideration, for example, the operability of the power tool 1.

[0066] As shown in Fig. 7, the second housing 12 may have a portion of an intake passage 123 that communicates with the internal space of the first housing 11 without communicating with the internal space of the second housing 12. In this embodiment, the second intake section 121 and the third intake section 113 may function as the intake passage 123. Fig. 7 shows a partial cross section of the housing 10 including the first intake section 111 and the second intake section 121 on the left side surface of the housing 10. The partial cross section of the housing 10 including the first intake section 111 and the second intake section 121 on the right side surface of the housing 10 may also have the same configuration as the configuration on the left side surface of the housing 10.

[0067] The first intake section 111 may be a through-hole formed in the first wall section 116A of the first housing 11, which communicates between the internal space of the first housing 11 and the outside. On the other hand, the second intake section 121 may be a space formed in the wall section 124 of the second housing 12, which faces the internal space of the second housing 12, and which communicates with the outside of the second housing 12.

[0068] Of the walls 124 forming the second intake section 121, the wall 124 that abuts against the first housing 11 may have an opening 125 in a part thereof. Meanwhile, the first housing 11 may have a third intake section 113 at a position where it abuts against the wall 124. The third intake section 113 may be a through hole formed in the second wall 116B of the first housing 11. The third intake section 113 may be located in the second wall 116B so as to face the opening 125. This allows the second intake section 121 to communicate with the internal space of the first housing 11 via the third intake section 113.

[0069] As described in the first embodiment, by driving the fan 74, gas may be caused to flow from the outside of the housing 10 into the internal space via the first intake section 111 and the second intake section 121. The gas that has flowed into the second intake section 121 by driving the fan 74 may flow into the internal space of the first housing 11 via the intake path 123.

[0070] The intake path 123 may be separated from the internal space of the second housing 12 in which the circuit board 73 is located by the wall portion 124 that forms the second intake portion 121. Therefore, the gas that has flowed into the second intake portion 121 can be caused to flow into the internal space of the first housing 11 via the intake path 123 while reducing the risk that the gas will reach the circuit board 73 located in the internal space of the second housing 12.

[0071] Therefore, it is possible to increase the amount of gas flowing into the motor 71 while reducing the risk of gas flowing into the circuit board 73. In other words, it is possible to increase the amount of gas flowing into the motor 71 while reducing the risk of the circuit board 73 being damaged by dust contained in the gas, thereby efficiently cooling the motor 71.

[0072] When second housing 12 includes multiple second intake sections 121 as in this embodiment, intake passages 123 may be formed for each second intake section 121. Also, as long as opening 125 and third intake section 113 communicate with each other, opening 125 and third intake section 113 may have different sizes and shapes. However, opening 125 and third intake section 113 may have the same sizes and shapes.

[0073] 〔summary〕 An electric tool according to aspect 1 of the present disclosure comprises a motor, a housing for accommodating the motor, and a switch for switching the drive of the motor by rotating relative to the housing, the switch having a switch body having a first end that serves as a fulcrum for rotation and a second end opposite the first end, and at least one protrusion protruding from the switch body, the switch body being positioned along the longitudinal direction of the housing in a first state in which the second end is closest to the housing, the side of the housing on which the switch is located being the lower side and the side of the housing opposite the lower side being the upper side, and the protrusion protruding toward the upper side in the first state.

[0074] A power tool according to a second aspect of the present disclosure is similar to the first aspect, wherein the protrusion has a curved shape that follows the curved shape of the outer wall surface of the housing in the first state.

[0075] An electric power tool according to aspect 3 of the present disclosure is similar to aspect 1 or 2, in that, when viewed in a plan view of the switch, the protrusion protrudes from the switch body at an acute angle with respect to the direction from the first end to the second end.

[0076] A fourth aspect of the present disclosure relates to the power tool of any one of the first to third aspects, wherein the protrusion protrudes from the second end of the switch body.

[0077] A fifth aspect of the present disclosure relates to an electric power tool similar to the fourth aspect, wherein the switch body has a recess at the second end that is recessed toward the first end when the switch body is viewed in a plan view.

[0078] An electric power tool according to aspect 6 of the present disclosure is any one of aspects 1 to 5, wherein the switch has two protrusions, and when the switch body is viewed in a planar view, the two protrusions protrude in opposite directions from each other with a virtual line passing through the first end and the second end as the center line.

[0079] A seventh aspect of the present disclosure relates to the power tool of any one of the first to sixth aspects, wherein in the first state, a tip end of the protrusion is positioned in the lower portion of the housing.

[0080] An eighth aspect of the present disclosure relates to a power tool according to any one of the first to seventh aspects, wherein the tip of the protrusion has a shape capable of forming a gap between the tip and the outer wall surface of the housing in the first state.

[0081] An electric power tool according to aspect 9 of the present disclosure is any one of aspects 1 to 8, wherein the housing includes a first housing that stores the motor and a second housing that stores a circuit board that controls the motor, and the second housing has a portion of an intake passage that communicates with the internal space of the first housing without communicating with the internal space of the second housing.

[0082] [Additional Notes] The invention according to the present disclosure has been described above based on the drawings and examples. However, the invention according to the present disclosure is not limited to the above-mentioned embodiments. In other words, the invention according to the present disclosure can be modified in various ways within the scope of the present disclosure, and the embodiments obtained by appropriately combining the technical means disclosed in the different embodiments are also included in the technical scope of the invention according to the present disclosure. In other words, it should be noted that a person skilled in the art can easily make various modifications or corrections based on the present disclosure. It should also be noted that these modifications or corrections are included in the scope of the present disclosure. [Explanation of symbols]

[0083] 1 Power tools 10. Housing 11 First Housing 115 Exterior wall surface 12 Second Housing 123 Intake passage 50 Switch 51 Switch body 511 First end 512 Second end 52 Protrusion 52A 1st protrusion (protrusion) 52B 2nd protrusion (protrusion) 521 Tip 53 Recess 71 Motor 73 Circuit Board CL2 center line G1 Gap

Claims

1. A motor; a housing for accommodating the motor; a switch that switches the drive of the motor by rotating with respect to the housing, The switch is a switch body having a first end serving as a pivot point and a second end opposite the first end; At least one protrusion protruding from the switch body, The switch body is located along a longitudinal direction of the housing in a first state in which the second end is closest to the housing, A side of the housing where the switch is located is defined as a lower side, and a side of the housing opposite to the lower side is defined as an upper side, The protrusion protrudes upward in the first state.

2. The power tool according to claim 1 , wherein the protrusion has a curved shape that conforms to a curved shape of an outer wall surface of the housing in the first state.

3. The power tool according to claim 1 , wherein, in a plan view of the switch, the protrusion protrudes from the switch body at an acute angle with respect to a direction from the first end toward the second end.

4. The power tool of claim 1 , wherein the protrusion protrudes from the second end of the switch body.

5. The power tool according to claim 4 , wherein the switch body has a recess in the second end portion that is recessed toward the first end portion in a plan view of the switch body.

6. The switch has two protrusions, The power tool according to claim 1, wherein when the switch body is viewed in a plane, the two protrusions protrude in opposite directions from each other with a virtual line segment passing through the first end and the second end as a center line.

7. The power tool according to claim 1 , wherein in the first state, a tip end of the protrusion is located in the lower portion of the housing.

8. The power tool according to claim 1 , wherein a tip end of the protrusion has a shape capable of forming a gap between the tip end and an outer wall surface of the housing in the first state.

9. The housing includes: a first housing for housing the motor; a second housing for storing a circuit board for controlling the motor; The power tool according to claim 1 , wherein the second housing has a part of an intake passage that communicates with an internal space of the first housing without communicating with an internal space of the second housing.

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