JP2011136405A - Power tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable power tool capable of attaining enhancement of operability of a control switch while shortening the whole length. <P>SOLUTION: The power tool (1) including a spindle 8 driven by a motor 3; a cylindrical housing 2 for storing the motor 3; and a battery pack 5 provided on one end of the housing 2, and in the power tool (1), the motor 3, the spindle 8 and a part of the battery pack are arranged on the same linear line. A dial switch 20 for changing a rotation speed of a distal end tool is provided at a position adjacent to the battery pack 5 and at a side left from an axis of the motor. The dial switch 20 is also used as an ON/OFF switch of rotation of the motor, and a rotation shaft 23 of the dial 22 is arranged so as to become approximately parallel to a rotation axis of the motor. The dial switch 20 is provided at the inside of the housing 2 and a part of the dial 22 is exposed to the outer side from the housing 2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electric tool provided with a switch for adjusting a rotation of a motor by directly attaching a shaft such as a spindle to a motor such as a straight grinder.

  As a portable electric tool for attaching a shaft such as a spindle directly to a motor and rotating a grindstone or the like attached to the tip of the spindle, a straight grinder as in Patent Document 1 is known. The straight grinder uses a motor as a drive source to rotate the spindle by the rotational force generated by the motor and rotate a tip tool such as a grindstone attached to the tip of the spindle to perform operations such as polishing. A portable power tool is not only lightweight and compact, but also requires a handle shape that fits the hand and is easy to hold and has good workability, because the operator directly holds it in hand. . In order to improve operability, cordless type electric tools using a detachable battery pack are widely used.

  FIG. 6 is an overall view showing the structure of a conventional cordless straight grinder, and shows a state in which one side of the right and left split type housing 2 is removed. In the straight grinder 101, a motor 103 is accommodated near the center of the substantially cylindrical housing 2, and a rotary shaft 106 is directly connected to a spindle 108 at the front end side of the motor 103 (in FIG. 6, the rotary shaft 106 is In order to understand the connection relationship of the spindle 108, only the connecting portion is shown in a sectional view). A battery pack 5 for supplying power to the motor 103 is mounted on the rear side of the housing 102. The battery pack 5 is attached to the housing 2 so as to be slid forward from the rear, and a plurality of battery cells are accommodated therein so as to have a substantially L-shaped outer shape as viewed from the side as shown in FIG. The A substrate 125 is provided at the rear end portion of the housing 102, and a terminal 126 that contacts the terminal portion of the battery pack 5 is provided on the substrate 125. When the battery pack 5 is mounted from the rear to the front and the battery pack 5 is pushed in until the front end portion 5d of the battery pack 5 reaches the inner wall 131 of the front end of the battery chamber of the housing 2, the latch 5c is engaged and the battery pack 5 is Fixed.

  A rotary dial switch 120 that adjusts the rotation of the motor 103 is provided inside the housing 102 and between the battery pack 5 and the motor 103. The dial switch 120 includes a switch part 121 and a dial part 122, and a part of the dial part 122 is disposed so as to protrude above the housing 2, and the rotation of the motor 103 is performed by an operator turning the dial part 122. On / off of the motor 103 and the rotation speed of the motor 103 can be adjusted. The motor 103 is a DC motor, and the electric power supplied from the board 125 is adjusted by the dial switch 120 and transmitted to the motor 103.

  A spindle 108 is provided at the front portion of the motor 103, and a collet 112 is provided on the spindle 108 as a fixing member for the tip tool. The tip tool can be attached to the spindle 8 in a non-rotatable manner. The straight grinder 101 shown in FIG. 6 is assumed to have the operator gripping with one hand to perform a polishing operation or a drilling operation, so that the front end side of the grip portion of the housing 102 is thin.

U.S. Pat. No. D491,031

  In the cordless straight grinder 101, since the heavy battery pack 5 is located behind the housing 102, the center of gravity of the straight grinder 101 is located behind. When the operator grips the tip of the disc grinder 101 with one hand so as to hold a pencil and performs operations such as polishing and drilling, the position of the center of gravity is behind, making it difficult to perform the operation. Fatigue will increase. Therefore, it is desirable that the position of the center of gravity of the straight grinder 101 is as far forward as possible, that is, the position of the center of gravity is close to the tip of the grip portion. However, in the conventional straight grinder 101, since the dial switch 120 for adjusting the rotation of the motor 103 is disposed between the battery pack 5 and the motor 103, the length of the portion W1 in FIG. It will be long. In addition, the heavy battery pack 5 is far from the grip portion at the tip, causing a reduction in work efficiency.

  The present invention has been made in view of the above background, and an object thereof is to provide a portable electric tool capable of improving the operability of a control switch while shortening the overall length.

  Another object of the present invention is to provide a portable electric tool that makes it easy to operate a switch for adjusting the rotation of a motor and improves the durability of the switch.

  Still another object of the present invention is to make the battery pack heavier closer to the grip on the tip side than the conventional product, thereby reducing the center of gravity during work, improving work efficiency and reducing work fatigue. An object of the present invention is to provide a power tool that can be used.

  Of the inventions disclosed in the present application, typical features will be described as follows.

  According to one aspect of the present invention, the motor includes a motor, a spindle that is rotationally driven by the motor and rotates the tip tool, a cylindrical housing that houses the motor, and a battery pack that is provided at one end of the housing. In a power tool in which a part of the spindle and the battery pack are arranged on the same straight line, a shift switch for changing the rotation speed of the tip tool is provided at a position adjacent to the battery pack and away from the straight line. It is done. The speed change switch is a rotary dial switch that also functions as an on / off switch for rotation of the motor, and the rotation axis of the dial switch is provided so as to be substantially parallel to the rotation axis of the motor. The dial switch is provided in the housing, and a part of the dial of the dial switch is exposed to the outside from the housing.

  According to another feature of the invention, the battery pack has an L-shaped cross section when viewed from the side, and the shift switch is disposed in a region sandwiched between the L-shaped shapes. The battery pack includes, for example, three battery cells. One battery cell is accommodated in the housing, and the L-shaped battery pack is formed in the housing so that the remaining two battery cells partially protrude from the rear of the housing. Installed. When the power tool is placed on the floor with the battery pack attached, multiple locations on the housing are in contact with the floor, and the dial switch is perpendicular to the motor axis and the grounding point on the rear end side of the power tool. It is arranged so that it is located inside the triangle defined by the line passing through and the floor. Further, when the electric tool is placed on the floor with the battery pack attached to the electric tool, a predetermined clearance exists between the portion exposed to the outside from the dial switch housing and the floor surface.

  According to still another aspect of the present invention, a motor for driving a spindle for rotating a tip tool, switch means for turning on / off and shifting the motor, a housing for accommodating them, and a rear end portion of the housing In the electric tool having the battery pack to be mounted, the switch means is arranged so as to overlap the battery pack in a direction perpendicular to the longitudinal direction. The switch means was disposed so as to be located inside the triangle defined by the floor surface and the axis of the motor, the line perpendicular to the axis and passing through the grounding point on the rear end side of the power tool.

  According to the first aspect of the present invention, in the electric tool in which a part of the motor, the spindle, and the battery pack are arranged on the same straight line, the shift switch for changing the rotation speed of the tip tool is positioned adjacent to the battery pack. And since it provided in the side away from a straight line, the position of the switch which adjusts rotation of a motor can be arrange | positioned in parallel with a heavy battery pack, and a product full length can be comprised short.

  According to the second aspect of the present invention, the speed change switch is a rotary dial switch that also functions as a motor rotation on / off switch, and the rotation axis of the dial switch is substantially parallel to the rotation axis of the motor. With one switch, not only the motor can be turned on / off, but also the speed can be adjusted, and the operability can be improved.

  According to the third aspect of the present invention, the dial switch is provided in the housing, and a part of the dial of the dial switch is exposed to the outside from the housing.

  According to the invention of claim 4, since the speed change switch is disposed in the region sandwiched between the L-shaped shapes, the portion that becomes the dead space can be used effectively, and the product is accidentally dropped. If this happens, the possibility of the switch hitting directly can be reduced.

  According to the invention of claim 5, the battery pack includes three battery cells, and one battery cell is accommodated in the housing, and the remaining two battery cells partially protrude from the rear of the housing. Since the pack is mounted on the housing, the position of the heavy battery pack becomes more forward while suppressing the enlargement of the diameter of the housing as much as possible, improving work efficiency and reducing work fatigue.

  According to invention of Claim 6, a dial switch is located in the inside of the triangle defined by the axis of a motor, the line perpendicular | vertical to an axis and passing through the grounding point of the rear-end side of an electric tool, and a floor surface. Thus, the portion that becomes a dead space can be used effectively, and if the product is accidentally dropped, the possibility that the dial switch directly hits can be reduced.

  According to the seventh aspect of the present invention, when the electric tool is placed on the floor, a predetermined clearance exists between the portion exposed to the outside from the dial switch housing and the floor surface. There is almost no risk of damaging the dial switch even after repeated placement.

  According to the invention of claim 8, in the electric tool, the switch means is disposed so as to overlap the battery pack in the direction perpendicular to the longitudinal direction, so that the total length of the product can be shortened.

  According to the invention of claim 9, the switch means is located inside the triangle defined by the floor surface and the axis of the motor, the line perpendicular to the axis and passing through the grounding point on the rear end side of the electric tool. Thus, the portion that becomes a dead space can be used effectively, and if the product is accidentally dropped, it can be avoided that the dial switch directly hits.

  According to the tenth aspect of the present invention, since the dial switch is provided at the connection portion between the battery pack and the housing, the operator can operate the dial switch after the operation of inserting the battery pack into the battery pack housing portion. For this reason, an electric tool with good operability can be provided.

  According to the eleventh aspect of the invention, since the dial switch is provided behind the grip portion and in front of the battery pack, the dial switch can be easily operated with the grip portion gripped. For this reason, an electric tool with good operability can be provided.

  According to the twelfth aspect of the present invention, since the microcomputer board and the switch board are provided separately, the size of the electric tool can be easily reduced without making one board too large. Further, since the dial switch is provided in front of the microcomputer board, the dial switch is easy to see.

  The above and other objects and novel features of the present invention will become apparent from the following description and drawings.

It is a general view which shows the structure of the straight grinder which concerns on the Example of this invention, and shows the state which removed the one side of the right-and-left division type housing. It is a side view which shows the external appearance shape of the straight grinder which concerns on the Example of this invention. It is sectional drawing which shows the internal structure of the battery pack 5 of FIG. 1, and is a cross section of the MM part of FIG. It is a figure which shows the state at the time of placing the straight grinder which concerns on the Example of this invention on the floor. It is a figure for demonstrating the gravity center position of the straight grinder 1 which concerns on the Example of this invention. It is a general view which shows the structure of the conventional straight grinder, and shows the state which removed the one side of the right-and-left division type housing.

  Embodiments of the present invention will be described below with reference to the drawings. In the following description, the front and rear directions and the left and right directions will be described as the directions shown in FIGS.

  FIG. 1 is an overall view showing the structure of an electric power tool according to an embodiment of the present invention, and shows a state where one side of a left and right split type housing 2 is removed. The housing 2 has a substantially cylindrical shape and is formed so as to be divided into right and left on a vertical plane including the axial direction (front-rear direction) of the motor. A screw boss for a plurality of female screws is provided on one housing (not shown). However, a screw boss 28 having a plurality of through holes is formed in the other housing 2. The motor 3 is accommodated near the center of the housing 2 and slightly forward. The motor 3 is, for example, a direct current motor, and rotates by electric power supplied from the battery pack 5. Since the motor 3 is fixed so as to be sandwiched between the left and right divided housings 2, a plurality of ribs 34 for fixing the motor 3 are formed inside the housing 2. In addition, ribs 32 and 33 are formed to fix the front-rear direction of the motor 3. These ribs 32 to 34 are preferably manufactured together with the housing 2 by integral molding of synthetic resin.

  At the front end side of the motor 3, the rotating shaft 6 is directly connected to the spindle 8 (in FIG. 1, only the connecting portion is shown in a sectional view so that the connecting relationship of the rotating shaft 6 and the spindle 8 can be understood). . Any known method can be used for fixing the rotary shaft 6 and the spindle 8, for example, press fitting. The spindle 8 is provided with holes 8a at two symmetrical positions. A collet 12 is provided at the front end of the spindle 8 as a fixing member for the tip tool, and an operator attaches a tip tool such as a grindstone or a drill bit (not shown) to the spindle 8 in a non-rotatable manner by tightening a collet nut 13. It is possible. The spindle lock 9 is a mechanism for locking the rotation of the spindle 8 so that the spindle 8 does not rotate when the tip tool is attached / detached. When a button on the spindle lock 9 is pressed, the lock pin 9a protrudes toward the spindle 8 and the hole portion By engaging with 8a, the spindle 8 can be locked so as not to rotate. The spindle 8 is held by the housing 2 so as to be rotatable by a ball-type bearing 11, and a cylindrical case 15 is attached to the outer peripheral side of the spindle 8 so as to act as a connecting member.

  A battery pack 5 for supplying power to the motor 3 is mounted on the rear side of the housing 2. The battery pack 5 is slid from the rear to the front and attached to the housing 2. The battery pack 5 has a substantially L-shaped outer shape as viewed from the side, and accommodates a plurality of battery cells. In this embodiment, three lithium ion battery cells are included and one is about 3.6V, so the voltage of the battery pack 5 is about 10.8V. A substrate 25 is provided at the rear end of the housing 2, and a terminal 26 that contacts the terminal portion of the battery pack 5 is provided on the substrate 25. A microcomputer (not shown) is mounted on the board 25, which is a microcomputer board. The microcomputer board protects the battery from overcurrent. The battery pack 5 is mounted from the rear to the front, and the battery pack 5 is pushed in until the front end portion 5d of the battery pack 5 reaches the inner wall 31 of the front end of the battery chamber of the housing 2, whereby the latch 5c is formed on the inner wall of the housing 2. The battery pack 5 is fixed by engaging with a recess (not shown).

  FIG. 3 is a cross-sectional view of the battery pack 5 and shows a cross section taken along the line MM in FIG. The battery pack 5 accommodates one battery cell 51 horizontally in the case 50 (where the vertical and horizontal directions are based on FIG. 1), and two batteries are placed behind the horizontal battery cell 51. The cells 52 and 53 are accommodated vertically, and the battery pack 5 is arranged so as to be substantially L-shaped when viewed from the side as shown in FIG. When the battery pack 5 is mounted in the housing 2 of the straight grinder 1, one battery cell 51 placed horizontally in the battery pack 5 is completely stored in the housing 2 of the straight grinder 1 (region of FIG. 1). 5a), the remaining part, that is, a part or all of the other two vertically placed battery cells 52 and 53 may be configured to protrude outside the housing 2 (region 5b in FIG. 1). Thus, since the shape of the battery pack 5 is substantially L-shaped when viewed from the side, the size (particularly the diameter) of the region 5a accommodated in the housing 2 can be reduced. The diameter of the housing 2 at the portion 5a can be reduced, and a large-capacity battery pack can be realized while making the housing 2 a diameter that is easy for an operator to grip.

  Returning to FIG. 1, the electric power of the battery pack 5 is connected to the plus terminal 4 a and the minus terminal 4 b of the motor 3 via the terminal 26 and the substrate 25. A dial switch 20 for adjusting the amount of power supplied to the motor 3 is connected during this connection. The dial switch 20 is a shift switch for turning on / off the rotation of the motor 3 and adjusting the rotation speed of the motor 3 continuously variable or in a plurality of stages. The dial switch 20 is mounted between the motor 3 and the battery pack 5 in the conventional example. However, in this embodiment, the dial switch 20 is disposed so as to overlap the battery pack in the direction perpendicular to the longitudinal direction (front-rear direction). Therefore, the distance W2 between the rear end of the motor 3 and the battery chamber front end inner wall 31 can be shortened. In this embodiment, only the screw boss 28 exists on the rib 32 and the inner wall 31 at the tip of the battery chamber, and the other is only the cable 27 from the switch board 24 or board 25 to the terminals 4a and 4b.

  The dial switch 20 has a variable resistor (not shown). The variable resistor is a position of a movable contact that is slidably in contact with the resistor plate via a screw and a shaft by rotating the dial 22. Can be changed arbitrarily. The resistance value is transmitted from the switch unit 21 to the substrate 25 via the switch substrate 24 by a signal line connecting the substrate 25 and the switch substrate 24. In this way, the number of rotations of the motor 3 can be changed steplessly by the microcomputer. Here, the dial 22 can be rotated around the rotation shaft 23. The dial 22 is attached so that a part near the lower end is exposed to the outside from the housing 2 so that the operator can turn the dial 22. Although not shown, a number (0 to 5) indicating the rotation speed of the motor 3 is printed on the dial 22, and the operator can rotate the dial 22 with reference to the number.

  FIG. 2 is a side view showing the appearance of the straight grinder 1 according to the embodiment of the present invention. A resin cover 29 made of a synthetic material made of a soft material is attached to the outer periphery of the grip portion on the front side of the housing 2 to improve the grip feeling by the operator. In the straight grinder 1 of the present embodiment, there is no strict definition as to the range of the gripping portion that the operator grips with his hand, and the operator can freely determine which neighborhood, but generally it is shown in FIG. It is considered that the range thus obtained becomes the grip portion. A part of the dial 22 is exposed from the housing 2, but the shape of the housing 2 in the vicinity of the dial 22 is shaped so as to follow the outer contour of the dial 22 as indicated by arrows 36 to 38. Without damaging, the dial 22 is prevented from projecting from the housing 2 to the outside more than necessary. Moreover, since the LED 14 for illumination (refer FIG. 1) is attached below the front-end side of the housing 2, the part protrudes below as shown by the arrow 39. When the straight grinder 1 is placed on the floor, the portions of the arrows 36 and 39 which are protruding portions serve as contact points in contact with the floor.

  FIG. 4 is a diagram showing a state when the straight grinder 1 according to the embodiment of the present invention is placed on the floor. When the straight grinder 1 is placed on the floor, the front end side is grounded at the ground point D, and the rear end side is grounded at the ground point A. Here, when an axis 41 passing through the rotation axis of the motor 3 and a vertical line 42 passing through the rear intersection B and perpendicularly drawn from the axis 41 are drawn, a right triangle ABC is formed by these and the upper surface of the floor 40. The dial switch 20 according to the present embodiment is characterized in that it is arranged inside the right triangle ABC. From another point of view, the dial switch 20 is provided in a region sandwiched between the L-shaped battery packs 5. That is, the dial switch 20 is provided at a position that overlaps the straight line 44 that connects the lower position E at the front end of the battery pack 5 and the lower position F at the rear end of the housing 2. The position of the dial switch 20 is located behind the grip portion where the straight grinder 1 is not grasped by a normal hand during operation.

  If the axis 43 of the rotary shaft 23 of the dial 22 is arranged so as to be substantially parallel to the axis 41, the rotation direction of the dial becomes the circumferential direction of the housing 2 and the operability is improved. A part of the dial 22 is exposed to the outside from the housing 2 and is configured so that an operator can operate it by turning the exposed portion with a finger. At this time, the dial 22 of the dial switch 20 is disposed so as to be separated from the upper surface of the floor 40 by a sufficient distance H1.

  On the other hand, in order to allow the operator to easily grasp the straight grinder 1 placed on the floor, the lower side of the grip portion near the center in the axial direction, that is, the portion of the distance H2 is configured to have a sufficient gap. The size of the gap may be set so that the operator can easily put his finger, grasp the grip portion, and easily lift the straight grinder 1.

  With the configuration as described above, it is possible to realize the straight grinder 1 that can move the center of gravity to the front side and is easy to use. FIG. 5 is a diagram for explaining the position of the center of gravity of the straight grinder 1. Assuming that the center of gravity of the conventional straight grinder 101 is near 61, the center of gravity of the straight grinder 1 according to the present embodiment is about 62, so that the center of gravity can be moved from 61 to 62. As a result, the center of gravity of the straight grinder 1 approaches the shaded portion 65 corresponding to the grip portion of the thumb and forefinger during actual work, so it is particularly easy to carry out fine work of the engraved sword and reduce fatigue during continuous work. Is done.

  As described above, in this embodiment, the dial switch 20 is disposed at a position overlapping the L-shaped battery pack 5 in the housing 2, so that the front end portion 5 d of the battery pack 5 is adjacent to the rear end portion of the motor 3. The total length of the straight grinder 1 can be shortened by the length of the dial switch 20, and the size can be reduced. For this reason, since the position of the center of gravity when the operator grasps the grip portion approaches the tip tool side, the work can be performed with good workability, and the workability can be improved.

  As mentioned above, although demonstrated based on the Example which shows this invention, this invention is not limited to the above-mentioned Example, A various change is possible within the range which does not deviate from the meaning. For example, the present invention has been described with respect to an example of a straight grinder having a spindle coaxially with a motor. However, the present invention is not limited thereto, and any other electric tool in which an L-shaped battery pack is attached to an end of a housing that houses a motor. The same applies to the above. Further, in this embodiment, an example in which a rotary dial switch is used as a shift switch has been described. However, a slide switch or other switch means may be used. Furthermore, although the example which used the direct current motor as a motor was demonstrated in the present Example, it is not limited to this, Other types of motors, such as a brushless direct current motor and an alternating current motor, may be sufficient.

1 Straight grinder 2 Housing 3 Motor 4a Positive terminal 4b Negative terminal
5 Battery pack 5c Latch 5d Tip
6 Rotating shaft 8 Spindle 8a Hole 9 Spindle lock 9a Lock pin 11 Bearing 12 Collet 13 Collet nut 15 Case 20 Dial switch 21 Switch unit 22 Dial 23 Rotating shaft 24 Switch board 25 Board 26 Terminal 27 Cable 28 Screw boss 29 Resin cover 31 Battery Inner walls 32, 33, and 34 at the tip of the chamber Rib 40 Floor 41 Axis 42 Vertical line 43 Axis
50 Case 51, 52, 53 Battery cell 61, 62 Center of gravity position 65 Shaded part 101 Straight grinder 102 Housing 103 Motor 106 Rotating shaft 108 Spindle 112 Collet 113 Collet nut 120 Dial switch 121 Switch part 122 Dial part 125 Substrate 126 Terminal 131 Battery chamber Tip inner wall

Claims (12)

A motor,
A spindle that is rotationally driven by the motor and rotates the tip tool;
A cylindrical housing that houses the motor;
A battery pack provided at one end of the housing;
In the electric tool in which a part of the motor, the spindle and the battery pack are arranged on the same straight line,
An electric power tool characterized in that a shift switch for changing the rotation speed of the tip tool is provided at a position adjacent to the battery pack and away from the straight line.   The shift switch is a rotary dial switch that doubles as a motor rotation on / off switch, and the rotation axis of the dial switch is provided so as to be substantially parallel to the rotation axis of the motor. The power tool according to claim 1.   The electric tool according to claim 2, wherein the dial switch is provided in the housing, and a part of the dial of the dial switch is exposed to the outside from the housing. The battery pack has an L-shaped cross section when viewed from the side,
4. The electric tool according to claim 2, wherein the shift switch is disposed in a region sandwiched between the L-shaped shapes.   The battery pack includes three battery cells, and the L-shaped battery pack includes one battery cell housed in the housing and the remaining two battery cells partially protruding from the rear of the housing. The electric tool according to claim 4, wherein the electric tool is attached to the housing. When the power tool is placed on the floor with the battery pack attached, a plurality of locations of the housing are in contact with the floor surface,
The dial switch is disposed so as to be positioned inside a triangle defined by a floor surface and a line that is perpendicular to the axis of the motor, passes through a ground point on the rear end side of the power tool, and perpendicular to the axis. The power tool according to claim 5. When the power tool is placed on the floor with a battery pack attached to the power tool,
The power tool according to claim 6, wherein a predetermined clearance exists between a portion of the dial switch exposed to the outside from the housing and the floor surface. In an electric tool having a motor for driving a spindle for rotating a tip tool, switch means for turning on / off the power of the motor and shifting, a housing for housing these, and a battery pack attached to a rear end portion of the housing ,
An electric tool characterized in that the switch means is arranged so as to overlap the battery pack in a direction perpendicular to the longitudinal direction.   The switch means is disposed so as to be located within a triangle defined by a floor surface and a line that is perpendicular to the axis of the motor, passes through a grounding point that is perpendicular to the axis and passes through the grounding point on the rear end side of the power tool. The power tool according to claim 8. A motor,
A tip tool driven by the motor;
A housing for housing the motor;
A battery chamber provided in the housing;
A battery pack attached to the battery chamber,
A power switch characterized in that a dial switch is provided at a connection portion between the battery pack and the housing. A motor,
A housing for housing the motor;
A grip provided on the housing;
A battery pack provided behind the gripping part,
An electric tool characterized in that a dial switch is provided behind the grip portion and in front of the battery pack. A motor,
A housing for housing the motor;
A grip provided on the housing;
A battery pack provided behind the gripping part,
A microcomputer board on which a microcomputer is provided is provided in front of the battery pack,
A switch board connected to the microcomputer board is provided in front of the microcomputer board,
A power tool characterized in that a dial switch is provided on the switch board.

Images