Electric power tool

Abstract

To provide an electric power tool, which is configured so that operability of a dial can be improved more than before.SOLUTION: An electric power tool (100), which is formed in a shape extending from a tip toward a rear end, comprises: a driving component (3) positioned at the tip side; a motor (6) that drives the driving component (3); a gripping part (1), positioned closer to the rear end side than the driving component (3), which is gripped by a user; and a dial (7) which can rotate with a first central axis (CA-1) as a center and can adjust rotation speed of the motor (6). The central axis (CA-1) is positioned closer to the tip side than the gripping part (1) and is positioned closer to the rear end side than a rotary shaft (AR) of the motor (6).SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to power tools, such as belt sanders. [Background technology]

[0002] As an example of a power tool, a belt sander for sanding woodworking products, metal products, etc. is known as a prior art. For example, Patent Document 1 discloses a hand-held belt sander in which an adjustment wheel of a rotation speed preselection device is provided at the rear end of the casing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-217093 Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional power tools such as the handheld belt sander of Patent Document 1, when adjusting the motor speed with a dial during work, the dial must be turned, for example, with the fingers of the hand that is not holding the casing. Also, while the worker's line of sight is directed toward the belt rather than the casing during work, the dial is located on the opposite side, making it difficult for the worker to see and is therefore out of the worker's field of vision. Thus, conventional power tools have room for improvement in terms of the operability of the dial.

[0005] An object of one aspect of the present disclosure is to provide a power tool having improved dial operability compared to conventional power tools. [Means for solving the problem]

[0006] An electric power tool according to one embodiment of the present disclosure is an electric power tool having a shape extending from a tip to a rear end, and includes a driving part located on the tip side, a motor that drives the driving part, a handle located on the rear end side of the driving part and held by a user, and a dial that is rotatable around a first central axis extending in the left-right direction and can adjust the rotation speed of the motor, wherein the first central axis is located on the tip side of the handle and on the rear end side of the rotation shaft of the motor. Effect of the Invention

[0007] According to one aspect of the present disclosure, it is possible to realize a power tool having improved dial operability compared to conventional power tools. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a left side view showing the electric power tool according to the embodiment. [Diagram 2] FIG. 1 is a top view showing a power tool according to an embodiment. [Diagram 3] 3 is a cross-sectional view of the power tool shown in FIG. 1 taken along line III-III. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] 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 parts necessary for explaining the embodiment in a simplified manner. Therefore, the power tool may include any component parts 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 parts and the dimensional ratios of each component.

[0010] [Configuration of power tool] The configuration of a power tool 100 according to this embodiment will be described with reference to Fig. 1 to Fig. 3. Fig. 1 is a left side view of the power tool 100. Fig. 2 is a top view of the power tool 100. Fig. 3 is a cross-sectional view of the power tool 100 taken along line III-III in Fig. 1. In this specification, a handheld belt sander will be described as an example of the power tool 100.

[0011] In this specification, the side where the driving parts are located is the front end side of the power tool 100, and the opposite side to the front end side is the rear end side of the power tool 100. When the power tool 100 is a hand-held belt sander, the side where the driven roller 3 is located is the front end side of the power tool 100, and the side where the second connecting part 12 is located is the rear end side of the power tool 100. The side where the dial 7 is located is the upper end side of the power tool 100, and the side where the switch trigger 8 is located is the lower end side of the power tool 100. Furthermore, the side where the safety cover 62 is located is the left end side of the power tool 100, and the opposite side to the side where the safety cover 62 is located is the right end side of the power tool 100. Hereinafter, the terms "front end side, rear end side, upper end side, lower end side, left end side, right end side" are abbreviated. Here, the "upper end side" may be rephrased as "upper", and the "lower end side" may be rephrased as "lower".

[0012] Examples of the power tool 100 other than the belt sander include a grinder, a polisher, and a multi-tool. That is, the power tool 100 may be any power tool provided that it includes a driving part, a motor for driving the driving part, a grip part to be gripped by a user, and a dial for adjusting the rotation speed of the motor, which is rotatable around a first central axis extending in the left-right direction. The "dial for adjusting the rotation speed of the motor" may be rephrased as "a dial capable of adjusting the rotation speed of the motor." The power tool 100 may be any power tool provided that the first central axis is located closer to the tip of the power tool than the grip part and closer to the rear end of the power tool than the rotation shaft of the motor. Here, the side where the driving part is located is the tip side of the power tool, and the side opposite to the tip side of the power tool is the rear end side of the power tool.

[0013] In other words, the power tool 100 may be any power tool that includes the aforementioned driving parts, a motor, a handle, a switch trigger, and a dial, and that is provided in a position that can be operated by the thumb of the hand holding the handle when the handle is held by a user and the switch trigger can be grasped by the index finger or middle finger of the hand holding the handle.

[0014] The power tool 100 is a handheld belt sander that extends from the front end to the rear end and is used to sand woodworking products, metal products, etc. As shown in Fig. 1, the power tool 100 includes a grip 1, an arm 2, a driven roller 3, a drive roller 4, a belt 5, a motor 6, a dial 7, a switch trigger 8, and a lock-on button 9. In this embodiment, since the power tool 100 is a handheld belt sander, the drive part that defines the front end side of the power tool 100 is the driven roller 3.

[0015] The grip portion 1 is located rearward of the driving components and is a portion that is gripped by a user. In this embodiment, the grip portion 1 is generally columnar extending toward the front end and rear end, and the rear end of the grip portion 1 bulges outward from other portions of the grip portion 1 toward both the front end and rear end. The rear end of the grip portion 1 has a second connection portion 12. The second connection portion 12 is a connector that connects a power cable (not shown) to the power tool 100. The rear end of the grip portion 1 may be structured to allow a battery pack (not shown) to be detachably attached instead of the second connection portion 12.

[0016] The arm 2 is a generally columnar part that is longer and thinner than the gripping part 1 and extends to the front and rear ends. The arm 2 is pivotable relative to the gripping part 1. The driven roller 3 is provided at the front end of the arm 2. The driving roller 4 is connected to an output shaft (not shown) of the motor 6, and is supported by a bearing (not shown). The driving roller 4 rotates around the rotation axis AR by the rotational driving force of the motor 6. The rotation axis AR is also the rotation axis of the motor. The belt 5 is a part that polishes the workpiece, and is stretched between the driven roller 3 and the driving roller 4. There is no limitation on the type of belt 5 as long as it can polish the workpiece.

[0017] The motor 6 is a motor that drives the driving components located at the tip side, and rotates around a rotation axis AR. In this embodiment, the driving roller 4 rotates when the motor 6 rotates, so the driving roller 4 is a direct driving component. The driven roller 3 and the belt 5 also rotate when the driving roller 4 rotates, so the driven roller 3 and the belt 5 are indirect driving components. The motor 6 may be any type of motor, for example, a brushless DC motor.

[0018] The housing 61 is a case that houses the motor 6. In this embodiment, the housing 61 has an outer shape that is substantially the same as the outer shape of the motor 6. A part of the side wall on the left end side of the housing 61 forms an opening (not shown). A safety cover 62 is provided on the left end side of the opening, and this safety cover 62 covers the opening from the left end side. The housing 61 is connected to the grip part 1 by a first connection part 11. The first connection part 11 is an example of a connection part according to one aspect of the present disclosure.

[0019] The dial 7 is a speed change dial that is rotatable around a first central axis CA-1 (central axis) extending in the left-right direction and that can adjust the rotation speed of the motor 6. The first central axis CA-1 is located closer to the tip side than the grip 1 and closer to the rear end than the rotation axis AR. In other words, the dial 7 is provided at a position where it can be operated by the thumb of the hand holding the grip 1 when the grip 1 is held by a user and the switch trigger 8 can be held by the index finger or middle finger of the hand holding the grip 1.

[0020] With the above configuration, when the user is holding the grip portion 1, the dial 7 is more easily visible to the user. Also, when using the power tool 100, the user can easily adjust the number of rotations of the belt 5 with only the hand holding the grip portion 1. As a result, the operability of the dial 7 is improved compared to conventional methods.

[0021] In this embodiment, the dial 7 has a main body 71 and a protruding portion 72 as shown in FIG. 3. The main body 71 is a disk-shaped portion as shown in FIGS. 1 to 3. The side surface of the main body 71 in the thickness direction has a plurality of concaves and convexes over the entire surface. When the user operates the dial 7, the user's finger comes into contact with one of the plurality of concaves. The protruding portion 72 is a hollow cylindrical portion as shown in FIG. 3, and protrudes from the side surface in the radial direction of the main body 71. The dial 7 is attached to the first connecting portion 11 by inserting the protruding portion 72 into a hole in the upper left side wall 111. The upper left side wall 111 is a side wall portion on the upper end side and the left end side of the first connecting portion 11. The arrangement position of the dial 7 will be described in detail later.

[0022] Furthermore, the dial 7 is connected to a variable resistor 73 when attached to the first connection part 11. The variable resistor 73 is an element that can vary its resistance value, and the amount of electricity flowing can be adjusted by changing the resistance value by rotating the protruding part of the variable resistor 73. Specifically, the dial 7 is connected to the variable resistor 73 with the protruding part of the variable resistor 73 housed in the hollow part of the protruding part 72.

[0023] In the present embodiment, the power tool 100 includes an O-ring 74 that seals the gap between the dial 7 and the first connection part 11. The O-ring 74 is an example of a sealing part according to one aspect of the present disclosure. Specifically, the opening on the left end side of the hole in the upper left side wall 111 is an annular step. As a result, when the dial 7 is attached to the first connection part 11, the upper left side wall 111 has a gap between the protrusion 72 and the annular step. In the present embodiment, the O-ring 74 is used as a sealing part that seals this gap. This can reduce the intrusion of fine foreign matter such as dust from the outside of the power tool 100 through this gap.

[0024] As a sealing part for sealing the gap between the dial 7 and the first connecting portion 11, various sealing parts can be used, such as an O-ring 74, an easily deformable elastic body such as a packing, or a fiber, depending on the shape and structure of the aforementioned gap.

[0025] The switch trigger 8 is a component for switching between driving and stopping the motor 6. In this embodiment, the switch trigger 8 is located at the lower end of the grip part 1 as shown in FIG. 1. Specifically, the switch trigger 8 is located across a lower end 14 of a front portion 13 of the grip part 1 and a lower end of a first connection part 11 described below. The front portion 13 is the tip side portion of the grip part. The switch trigger 8 has a main body part 81 and a safety lever 82.

[0026] 1, when the safety lever 82 is pushed from the tip side to the upper end side, the main body 81 is housed in the grip part 1. This causes the motor 6 to start driving. On the other hand, when the safety lever 82 is pushed toward the lower end side while the main body 81 is housed in the grip part 1, the main body 81 is exposed from the grip part 1 and returns to the state shown in FIG. 1. This causes the motor 6 to stop driving.

[0027] The position of the switch trigger 8 in the power tool 100 is not limited to the example of this embodiment. Any position may be used as long as the dial 7 is located in a position where it can be operated by the thumb of a hand holding the grip 1 when the grip 1 is held by a user and the switch trigger 8 can be held by the index finger or middle finger of the hand holding the grip 1.

[0028] The lock-on button 9 is a button for fixing the position of the switch trigger 8 while the motor 6 is driven. Here, the above-mentioned "position of the switch trigger 8" specifically refers to the position of the main body 81. In this embodiment, the lock-on button 9 is embedded in the left end side wall of the front portion 13. The position of the lock-on button 9 is not limited to the example of this embodiment. Furthermore, the power tool 100 does not have to be provided with the lock-on button 9.

[0029] [Position of dials on power tools] 1 to 3, the position of the dial 7 in the power tool 100 will be described. Note that the position described below is merely an example, and the dial 7 may be located anywhere on the power tool 100 as long as the operability of the dial 7 is improved compared to conventional positions.

[0030] In this embodiment, the dial 7 is located further towards the tip side than the grip portion 1. This means that the dial 7 does not overlap the grip portion 1 at all when the power tool 100 is viewed from the upper or lower end side. With this configuration, when a user holds the grip portion 1, the fingers of the hand holding the grip portion 1 may touch the dial 7, reducing the possibility of erroneous operation of the dial 7. This reduces erroneous operation of the dial 7 when the power tool 100 is in use, and further improves the operability of the dial 7.

[0031] In this embodiment, the dial 7 is located at the first connection portion 11. This configuration also realizes a state in which the dial 7 does not overlap the grip portion 1 at all when the power tool 100 is viewed from the top or bottom, thereby reducing erroneous operation of the dial 7 when the power tool 100 is in use.

[0032] Specifically, the dial 7 is located on a side surface 112 of the first connection part 11 as shown in Fig. 2 and Fig. 3. The side surface 112 is the outer side surface of the first connection part 11 in the upper left side wall 111 as shown in Fig. 3. With this configuration, it is easier for the user to operate the dial 7 with the thumb of the hand holding the grip part 1, compared to when the dial 7 is located on the surface on the upper end side of the first connection part 11. This further improves the operability of the dial 7.

[0033] In this embodiment, "the dial 7 is located on the side surface 112" means that when the dial 7 is attached to the first connection part 11, the position of the first central axis CA-1 coincides with the position of the central axis of the hole in the upper left side wall 111. In other words, "the dial 7 is located on the side surface 112" means that when the dial 7 is attached to the first connection part 11, as shown in FIG. 2, the first central axis CA-1 and the rotation axis AR are parallel to each other. In this case, "parallel" does not mean strictly parallel, and even if the two are slightly not parallel due to various errors that occur in the manufacturing process of the power tool 100, the two are within the scope of the above-mentioned concept of "parallel". In addition, "the dial 7 is located on the side surface 112" may be rephrased as "the first connection part 11 has a side surface 112 extending in the vertical direction, and the dial 7 is located on the side surface 112 of the first connection part 11".

[0034] According to this configuration, when the user operates the dial 7, the user can rotate the dial 7 in the direction of "upper end side → rear end side → lower end side → tip side → upper end side". As a result, when the user operates the dial 7, the user can rotate the dial 7 simply by sliding the thumb of the hand holding the grip part 1 from the tip side to the rear end side. Also, according to this configuration, when the user operates the dial 7, a part of the multiple unevennesses in the main body part 71 always faces the upper end side. As a result, when the user operates the dial 7, the thumb of the hand holding the grip part 1 always contacts a part of the multiple unevennesses, making it easier to operate the dial 7 than when the side surface in the thickness direction of the main body part 71 is flat over the entire surface. As a result, the operability of the dial 7 is further improved.

[0035] In this embodiment, the first central axis CA-1 is located above the rotation axis AR as shown in Fig. 1 and Fig. 3. With this configuration, it is easier for the user to place the thumb of the hand holding the grip 1 on the dial 7, compared to when the first central axis CA-1 is located at the same position as the rotation axis AR at the upper and lower ends, or when the first central axis CA-1 is located below the rotation axis AR. This further improves the operability of the dial 7.

[0036] In this embodiment, the dial 7 is located on the tip side of the center of gravity G of the switch trigger 8 as shown in FIG. 1. With this configuration, compared to a case where the dial 7 is not located on the tip side of the center of gravity G, it is easier for a user to grip the switch trigger 8 with the index finger or middle finger of the hand holding the grip portion 1 while operating the dial 7 with the thumb of the same hand. This makes it possible to improve the operability of the dial 7 and the switch trigger 8 as well as the operability of the dial 7 compared to the conventional case. Here, examples of a case where the dial 7 is not located on the tip side of the center of gravity G include a case where the position of the first center axis CA-1 is the same as the position of the center of gravity G on the tip side and rear end side, or a case where the dial 7 is located on the rear end side of the switch trigger 8.

[0037] Specifically, the dial 7 is located on the tip side of the fulcrum F of the safety lever 82. According to this configuration, compared to a case where the dial 7 is not located on the tip side of the fulcrum F, it is easier for the user to operate the dial 7 with the thumb of the hand holding the grip portion 1 and hook the safety lever 82 with the index finger of the same hand. In addition, it is easier for the user to grip the main body 81 with the middle finger of the hand holding the grip portion 1. This makes it possible to improve the operability of the dial 7 and the switch trigger 8 more than ever before. Here, examples of a case where the dial 7 is not located on the tip side of the fulcrum F include a case where the position of the first center axis CA-1 is the same as the position of the center of gravity G on the tip side and rear end side, or a case where the dial 7 is located on the rear end side of the switch trigger 8.

[0038] Moreover, in this embodiment, the dial 7 is located further forward than the lock-on button 9. The center of gravity (not shown) of the lock-on button 9 is located further forward than the center of gravity G. With these configurations, compared to a case in which the dial 7 is not located further forward than the lock-on button 9, it becomes easier for the user to operate the dial 7 with the thumb of the hand holding the grip portion 1 and to operate the lock-on button 9 with the index finger or middle finger of the same hand. This makes it possible to improve the operability of the dial 7 compared to conventional cases, while also improving the operability of the switch trigger 8.

[0039] Here, an example of a case where the dial 7 is not located further forward than the lock-on button 9 is when the position of the first center axis CA-1 is the same as the position of the center of gravity of the lock-on button 9 on the forward and rearward sides. Another example is when the dial 7 is located further rearward than the lock-on button 9.

[0040] In this embodiment, when the power tool 100 is viewed from the top end side as shown in FIG. 2 (hereinafter abbreviated as "top view"), the dial 7 is located closer to the belt 5 than the second central axis CA-2. The second central axis CA-2 is a central axis extending to the front end side and the rear end side of the grip part 1. Here, the grip part 1 may be defined as having a shape extending from the rear end side to the front end side along the second central axis CA-2. In addition, "located closer to the belt 5 than the second central axis CA-2" may be rephrased as "located closer to the belt 5 than the second central axis CA-2".

[0041] According to this configuration, even if the user operates the dial 7 while grinding the workpiece, the position, angle, etc. of the belt 5 with respect to the workpiece are less likely to change, compared to when the dial 7 is not located closer to the belt 5 than the second central axis CA-2 in top view. This not only improves the operability of the dial 7 compared to conventional methods, but also improves the operability of the power tool 100 during grinding. Here, an example of a case where the dial 7 is not located closer to the belt 5 than the second central axis CA-2 in top view is a case where the dial 7 is located on the second central axis CA-2 in top view. Another example is a case where the dial 7 is located on the opposite side of the belt 5 than the second central axis CA-2 in top view.

[0042] In this embodiment, when the power tool 100 is viewed from the front end side or when the power tool 100 is viewed from the rear end side as shown in FIG. 3, the dial 7 is located closer to the center of the grip portion 1 than the step portion 113 (more precisely, closer to the center of the first connection portion 11). The step portion 113 is a portion located lower than the dial 7. Specifically, the step portion 113 is a step-shaped portion located at the boundary between the upper left side wall 111 and other side wall portions on the left end side of the side wall of the first connection portion 11. Here, "located closer to the center of the grip portion 1 than the step portion 113 (more precisely, closer to the center of the first connection portion 11)" may be rephrased as "located closer to the center of the grip portion 1 than the step portion 113 (more precisely, closer to the center of the first connection portion 11)."

[0043] According to the above configuration, if the power tool 100 is dropped and a part of the dial 7 located near the step 113 is about to hit the floor or the like, the tip of the step 113 will hit the floor or the like before the part hits the floor or the like. In other words, the step 113 functions to protect the dial 7. This makes it possible to reduce damage to the dial 7 caused by the power tool 100 being dropped.

[0044] 〔summary〕 A first aspect of the present disclosure is an electric tool having a shape extending from a tip to a rear end, comprising: a driving part located at the tip side; a motor for driving the driving part; a handle located at the rear end side of the driving part and held by a user; and a dial rotatable around a first central axis extending in the left-right direction and capable of adjusting the rotation speed of the motor, wherein the first central axis is located at the tip side of the handle and at the rear end side of the rotation shaft of the motor.

[0045] A second aspect of the present disclosure is directed to the first aspect, wherein the dial is located closer to the tip side than the grip portion.

[0046] A third aspect of the present disclosure is the same as the first or second aspect, and further includes a housing that accommodates the motor and a connection portion that connects the housing and the grip portion, and the dial may be located at the connection portion.

[0047] A fourth aspect of the present disclosure is related to the third aspect, wherein the connection portion has a side surface extending in a vertical direction, and the dial is located on the side surface of the connection portion.

[0048] A fifth aspect of the present disclosure may be the third or fourth aspect further including a seal component that seals a gap between the dial and the connection portion.

[0049] A sixth aspect of the present disclosure is any one of the first to fifth aspects, further comprising a switch trigger located at a lower end of the grip portion for switching between driving and stopping the motor, and the dial may be located toward the tip side of the center of gravity of the switch trigger.

[0050] A seventh aspect of the present disclosure is based on any one of the first to sixth aspects, and wherein the first central shaft is located above a rotation shaft of the motor.

[0051] An eighth aspect of the present disclosure, in any of the first to seventh aspects, further comprises a switch trigger located at a lower end of the grip portion for switching between driving and stopping the motor, and the dial may be located on the tip side of the fulcrum of the safety lever of the switch trigger.

[0052] A ninth aspect of the present disclosure, in any of the first to eighth aspects, further comprises a switch trigger located at a lower end of the grip portion for switching between driving and stopping the motor, the grip portion having a lock-on button for fixing the position of the switch trigger when the motor is driving, and the dial may be located toward the tip side of the lock-on button.

[0053] A tenth aspect of the present disclosure, in any of the first to ninth aspects, further includes a housing that accommodates the motor, and a belt for polishing an object to be polished, located on a side of the housing, wherein the gripping portion has a shape that extends from the rear end side to the tip end side along a second central axis, and when the power tool is viewed from above, the dial may be located closer to the belt than the second central axis.

[0054] An eleventh aspect of the present disclosure is any one of aspects 1 to 10, further comprising a step portion located lower than the dial, and when the power tool is viewed from the tip side or the rear end side, the dial may be located closer to the center of the grip portion than the step portion.

[0055] Aspect 12 of the present disclosure is an electric tool having a shape extending from the tip to the rear end, comprising a driving part located at the tip side, a motor for driving the driving part, a grip portion located at the rear end side of the driving part and held by a user, a switch trigger for switching between driving and stopping the motor, and a dial that is rotatable around a central axis extending in the left-right direction and can adjust the rotation speed of the motor, wherein the dial is positioned so that it can be operated with the thumb of the hand when the grip portion is held by the user and the switch trigger can be held by the index finger or middle finger of the hand holding the grip portion.

[0056] [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]

[0057] 1 Grip part 3 Driven roller (driving part) 5 Belt 6 Motor 7 Dial 8 Switch Trigger 9 Lock-on button 11 First connection part (connection part) 74 O-ring (sealing part) 82 Safety lever 100 Power tools 112 Side 113 Step AR Rotation Axis CA-1 1st center axis, center axis CA-2 2nd center axis F fulcrum G center of gravity

Claims

1. An electric tool having a shape extending from a front end to a rear end, A driving component located on the tip side; A motor for driving the driving component; a grip portion located on the rear end side of the driving component and gripped by a user; a dial that is rotatable about a first central axis extending in the left-right direction and that can adjust the rotation speed of the motor; The first central axis is located closer to the tip side than the grip portion and closer to the rear side than a rotating shaft of the motor.

2. The power tool according to claim 1 , wherein the dial is located closer to the tip side than the grip portion.

3. a housing that accommodates the motor; a connection portion that connects the housing and the grip portion, The power tool of claim 1 , wherein the dial is located at the connection portion.

4. The connection portion has a side surface extending in a vertical direction, The power tool of claim 3 , wherein the dial is located on the side surface of the connection portion.

5. The power tool according to claim 3 or 4, further comprising a seal part that seals a gap between the dial and the connection part.

6. Further, a switch trigger is provided at a lower end of the gripping portion for switching between driving and stopping the motor, The power tool according to claim 1 , wherein the dial is located closer to the tip side than the center of gravity of the switch trigger.

7. The power tool according to claim 1 , wherein the first central shaft is located above a rotation shaft of the motor.

8. Further, a switch trigger is provided at a lower end of the gripping portion for switching between driving and stopping the motor, The power tool according to claim 1 , wherein the dial is located closer to the tip side than a fulcrum of a safety lever of the switch trigger.

9. Further, a switch trigger is provided at a lower end of the gripping portion for switching between driving and stopping the motor, the grip portion has a lock-on button for fixing the position of the switch trigger while the motor is driven, The power tool according to claim 1 , wherein the dial is located closer to the tip side than the lock-on button.

10. a housing that accommodates the motor; The polishing machine further includes a belt located on a side surface of the housing for polishing an object to be polished, The grip portion has a shape extending from the rear end side to the front end side along a second central axis, The power tool according to claim 1 , wherein the dial is located closer to the belt than the second center shaft when the power tool is viewed from above.

11. Further, a step portion is provided which is located below the dial, The power tool according to claim 1 , wherein the dial is located closer to a center of the grip portion than the stepped portion when the power tool is viewed from the front end side or the rear end side.

12. An electric tool having a shape extending from a front end to a rear end, A driving component located on the tip side; A motor for driving the driving component; a grip portion located on the rear end side of the driving component and gripped by a user; A switch trigger for switching between driving and stopping the motor; a dial that is rotatable about a central axis extending in the left-right direction and that can adjust the rotation speed of the motor; An electric power tool in which the dial is positioned so that it can be operated with the thumb of the hand when the handle is held by the user and the switch trigger can be held by the index finger or middle finger of the hand holding the handle.

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