JP2018075687A - Electric tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric tool capable of detecting an operation state of three or more stages in an operation moving member with a relatively simple configuration. SOLUTION: A work tool rotated by an electric motor built in an electric tool body, a trigger switch means 20 for changing the rotation speed of the electric motor, and an electric motor based on a detection signal from the trigger switch means 20. A power tool equipped with a rotation speed setting means (controller) for setting the rotation speed of. The trigger switch means 20 includes an operation moving member slidably mounted on the power tool main body 2, first and second magnets 52 and 54 disposed facing each other, and first and second magnets 52. The rotation speed setting means includes the magnetic flux detecting means 56 arranged between the and 54, and the rotation speed setting means sets the rotation speed of the electric motor 10 based on the detection signal from the magnetic flux detecting means 56. [Selection diagram] Fig. 2

Description

  The present invention relates to a power tool such as a drill driver or impact driver.

  As an electric tool, an electric motor for rotating a tool such as a drill or a driver, a trigger switch means for changing the rotation speed of the electric motor, and a rotation speed of the electric motor based on a detection signal from the trigger switch means There is known one provided with a rotation speed setting means for setting (see, for example, Patent Document 1).

  In this electric power tool, the trigger switch means includes an operation moving member slidably attached to the electric tool main body, a magnet attached to the operation moving member, and first and second magnets for detecting magnetic flux from the magnet. The first Hall IC and the second Hall IC are arranged so as to partially overlap in the sliding direction of the operation moving member. A main switch for detecting the start of movement of the operation moving member is provided, and the main switch detects an initial position (a position where the operation moving member is not operated).

  When the operation moving member is operated and moved, the main switch is turned on and current supply to the drive circuit of the electric motor is started. When the operation moving member is further moved, the first Hall IC detects the magnetic flux of the magnet that moves integrally with the operation moving member (at this time, the second Hall IC does not detect the magnetic flux of the magnet). . Thus, the rotation speed setting means generates a low speed rotation signal based on the detection signal from the first Hall IC, and the electric motor is driven to rotate at a low speed based on the low speed rotation signal.

  When the operation moving member is further moved from this low speed operation state, the first and second Hall ICs detect the magnetic flux of the magnet on the operation moving member side and rotate based on the detection signals from the first and second Hall ICs. The speed setting means generates a medium speed rotation signal, and the electric motor is driven to rotate at a medium speed based on the medium speed rotation signal. Further, when the operation moving member is operated and moved from this medium speed operation state, the second Hall IC detects the magnetic flux of the magnet on the operation moving member side (at this time, the first Hall IC does not detect the magnetic flux of the megnet). The rotation speed setting means generates a high speed rotation signal based on the detection signal from the second magnetic detection means, and the electric motor is driven to rotate at high speed based on the high speed rotation signal. As described above, the operation state of the operation moving member is detected in three stages by one magnet on the operation moving member side and two Hall ICs (first and second Hall ICs) on the electric tool main body side. Can be adjusted in three stages.

Japanese Patent No. 4939673

  However, in this electric power tool, it is necessary to provide two Hall ICs on the power tool main body side and one magnet on the operation moving member side in order to detect the three-stage operation state of the operation moving member. There is a problem that the design is somewhat complicated. Further, if it is attempted to detect the operation state of the operation moving member in four or more stages using such a configuration, three or more Hall ICs are required, and the circuit design is further complicated and the manufacturing cost is increased. There's a problem.

  An object of the present invention is to provide an electric tool capable of detecting an operation state of three or more stages in an operation moving member with a relatively simple configuration.

According to a first aspect of the present invention, there is provided a power tool, a power tool main body, an electric motor built in the power tool main body, a work tool rotated by the electric motor, and a rotation speed of the electric motor. In an electric tool comprising trigger switch means for, and rotation speed setting means for setting the rotation speed of the electric motor based on a detection signal from the trigger switch means,
The trigger switch means is disposed between the operation moving member slidably mounted on the electric tool main body, first and second magnets disposed to face each other, and the first and second magnets. Magnetic flux detection means, wherein the first and second magnets are arranged on the operation moving member side, the magnetic flux detection means is arranged on the electric tool body side, and the rotational speed setting means is The rotational speed of the electric motor is set based on a detection signal from the magnetic flux detection means.

  In the electric tool according to claim 2 of the present invention, a magnet attachment member is attached to the operation moving member of the trigger switch means, and the first and second magnets have the same polarity as the magnet attachment member. The magnetic flux detecting means attached to face each other and disposed on the power tool main body side is composed of a Hall IC.

  Moreover, in the electric tool according to claim 3 of the present invention, the trigger switch means includes a housing main body that houses the first and second magnets and the magnet mounting member, and the operation moving member includes an operation portion and A moving shaft extending from the operation portion into the housing body, and a sliding sleeve is slidably supported by the moving shaft, and the magnet mounting member is disposed at a distal end of the moving shaft. The moving shaft portion is fitted between the operation moving member and the sliding sleeve, and a coil spring is interposed between the operation moving member and the sliding sleeve. Further, the sliding sleeve is provided with a protruding portion protruding radially outward. The housing main body is provided with an action protrusion that acts on the protrusion of the sliding sleeve.

  In the power tool according to claim 4 of the present invention, the housing body is provided with an initial position holding protrusion corresponding to the initial position of the operation moving member, and the sliding sleeve side has the A contact portion is provided corresponding to the initial position holding protrusion on the housing main body side, and when the operation moving member is in the initial position, the contact portion on the sliding sleeve side is located on the housing main body side. It is characterized by being brought into contact with the initial position holding protrusion.

  Furthermore, in the electric tool according to claim 5 of the present invention, a pair of first guide protrusions extending in the sliding direction of the operation moving member are provided on the inner surface of the one surface wall of the housing body, and the inner surfaces of the other surface walls. Are provided with a pair of second guide protrusions extending in the sliding direction of the operation moving member, and the sliding sleeve and the magnet mounting member are provided with the pair of first guide protrusions and the pair of second guides. It is characterized by being slid along the guide ridge.

  According to the electric tool of the first aspect of the present invention, the trigger switch means of the electric tool is slidably mounted on the operation moving member, and the first and second magnets arranged so as to face each other. And a magnetic flux detecting means disposed between the first and second magnets, the first and second magnets being disposed on the operation moving member side, and the magnetic flux detecting means being disposed on the electric tool body side. Therefore, when the first and second magnets move relative to the magnetic flux detection means by the operation of the operation moving member, the detection signal of the magnetic flux detection means becomes continuous, and the rotation speed setting means detects the detection signal. The rotational speed of the electric motor is set based on Therefore, by setting the rotation speed by dividing the detection signal of the magnetic flux detection means into three ranges, the rotation speed of the electric motor can be switched in three stages, and the rotation speed is divided into four or more ranges. By setting, the rotation speed of the electric motor can be switched to four or more stages, and thus the rotation speed of the electric motor can be switched as desired with a relatively simple configuration. A simple electric tool can be provided at a relatively low cost.

  According to the power tool of claim 2 of the present invention, the first and second magnets are attached to the operation moving member so that the same poles face each other, and magnetic flux is detected on the power tool body side. Therefore, the operation movement of the operation moving member is converted into a continuous detection signal of the Hall IC, and by using this detection signal, the rotational speed of the electric motor can be set as desired. Can be switched to.

  By using a linear Hall IC as the Hall IC, the operation movement of the operation moving member can be converted into a substantially linear continuous detection signal of the Hall IC, and the rotation speed corresponding to the movement amount of the operation movement member. Can be set to

  Furthermore, according to the electric tool of the third aspect of the present invention, the trigger switch means includes a housing body that houses the first and second magnets and the magnet mounting member, and the operation moving member is moved from the operation portion to the housing body. Since the magnet mounting member is attached to the distal end of the moving shaft portion, the first and second magnets can be moved integrally with the operation moving member. Can be made. A sliding sleeve is slidably supported on the moving shaft, a coil spring is interposed between the operation moving member and the sliding sleeve, and a protruding portion is provided on the sliding sleeve. Since the operating protrusion is provided, when the operation moving member is operated in the operating direction, the protruding portion of the sliding sleeve comes into contact with the operating protruding portion on the housing body side, thereby restricting the movement of the sliding sleeve. As the operation amount of the operation moving member increases, the repulsive force of the coil spring increases, and the operation force of the operation moving member can be increased.

  According to the fourth aspect of the present invention, the housing body is provided with the initial position holding projection corresponding to the initial position of the operation moving member, and the housing body is provided on the sliding sleeve side. Since the abutting portion is provided corresponding to the initial position holding projection on the side, the abutting portion abuts the initial position holding projection on the housing body side, thereby holding the operation moving member in the initial position. be able to.

  Furthermore, according to the electric tool of claim 5 of the present invention, a pair of first guide protrusions are provided on the inner surface of the one side wall of the housing body, and a pair of second guide protrusions are provided on the inner surface of the other surface wall. Thus, the sliding sleeve and the magnet mounting member can be reliably slid in the sliding direction (operation direction) along the pair of first guide protrusions and the pair of second guide protrusions.

The front view which shows simply one Embodiment of the electric tool according to this invention. Sectional drawing which shows the trigger switch means of the electric tool of FIG. 1 in the state which is not operating the operation moving member. Sectional drawing by the III-III line in FIG. Sectional drawing by the IV-IV line in FIG. Sectional drawing which shows the trigger switch means of FIG. 2 in the state when operating the operation moving member a little. Sectional drawing which shows the trigger switch means of FIG. 2 in the state which operated the operation moving member most. The figure which shows the relationship between the movement amount of an operation movement member, and the detection output of a magnetic flux detection means. The block diagram which shows simply the control system of the electric tool of FIG.

  Hereinafter, with reference to the attached drawings, description will be made by applying to a drill driver as an example of an electric tool according to the present invention. In FIG. 1, the illustrated electric tool (drill driver) includes an electric tool main body 2, and the electric power tool main body 2 includes a cylindrical main body portion 4 and a grip portion 6 that protrudes from the rear portion of the main body portion 4. I have. In the main body 4, there is an electric motor 10 (for example, composed of a DC motor) for rotationally driving a drill 8 as a work tool, and a gear box 12 that is drivingly connected to the output side of the electric motor 10. The chuck means 14 is mounted on the output side of the gear box 12, and a drill 8 as a work tool is detachably mounted on the chuck means 14. Further, a battery 16 (for example, composed of a lithium ion battery) as a power source for the electric tool and a controller 18 for controlling the electric tool are incorporated in the gripping unit 6.

  This electric tool is provided with a trigger switch means 20 for controlling the rotation speed of the electric motor 10. The trigger switch means 20 is disposed in the vicinity of the connecting portion between the main body portion 4 and the grip portion 6 of the electric power tool main body 2, and the operation moving member 22 operated by the index finger of the hand gripping the grip portion 6, And a movement detector 24 for detecting the movement of the moving member 22.

  2 to 4, in the illustrated trigger switch means 20, the operation moving member 22 has an operation portion 26 operated by a finger and a moving shaft portion 28 extending from the operation portion 26. The operating portion 26 is provided at the tip of the moving shaft portion 28. The operation unit 26 is disposed outside the electric tool main body 2, the moving shaft unit 28 extends from the operation unit 26 into the electric tool main body 2, and the movement detection unit 24 is built in the electric tool main body 2.

  The movement detection unit 24 includes a housing body 34 configured by combining a pair of housing members, that is, first and second housing members 30 and 32. An opening 36 is provided on one end side of the housing main body 34, and a support sleeve 38 is attached to the opening 36. The moving shaft portion 28 of the operation moving member 22 extends into the housing main body 34 through the support sleeve 38. Yes.

  A sliding sleeve 40 and a magnet mounting member 42 are mounted on the distal end side of the moving shaft portion 28 of the operation moving member 22. The sliding sleeve 40 is slidably attached to the moving shaft portion 28, and the magnet mounting member 42 is attached to the distal end portion of the moving shaft portion 28. In relation to the sliding sleeve 40 and the magnet mounting member 42, first and second guide protrusions 44 and 46 are provided on the housing body 34 side. As shown in FIG. 3, a pair of first guide protrusions 44 are provided on the inner surface of one side wall (in other words, the first housing member 30) of the housing body 34, and the other side wall (in other words, the second housing member 32). A pair of second guide protrusions 46 are provided on the inner surface of the first and second guide protrusions 44, 46. The first and second guide protrusions 44, 46 are in the sliding direction of the operation moving member 22 (that is, the left-right direction in FIGS. 3 in a direction perpendicular to the paper surface).

  A rectangular first step 48 is provided on both sides of the sliding sleeve 40 and the magnet mounting member 42 on one side (the lower side in FIG. 3), and on both sides on the other side (the upper side in FIG. 3). A rectangular second step portion 50 is provided, and these first step portions 48 are slidably guided and supported between a pair of first guide protrusions 44 on the housing body 34 side. Is slidably supported between the pair of second guide protrusions 46 on the housing main body 34 side, and therefore the sliding sleeve 40 and the magnet mounting member 42 are accommodated in the housing main body 34 in a pair. The first guide protrusions 44 and the pair of second guide protrusions 46 are slidably supported. Since it is configured in this way, as understood from FIG. 2, one end side of the operation moving member 22 (the front end side of the moving shaft portion 28) is supported by the housing body 34 via the support sleeve 38, and the other end. The side (the rear end side of the moving shaft portion 28) is supported by the housing body 34 via the sliding sleeve 40 and the magnet mounting member 42.

  In this embodiment, the movement detection unit 24 detects first and second magnets 52 and 54 for detecting the movement amount of the operation moving member 22 and changes in magnetic flux from the first and second magnets 52 and 54. Magnetic flux detecting means 56 for the purpose. Referring to FIG. 2, magnet attachment member 42 has an attachment main body 58 extending in the sliding direction (left-right direction in FIG. 2), and first attachment portion 60 is provided at one end (left end in FIG. 2). The second attachment portion 62 is provided at the other end, the first magnet 52 is attached inside the first attachment portion 60, and the second magnet 54 is attached to the inner surface of the second attachment portion 62. With this configuration, when the operation moving member 22 is operated in the direction indicated by the arrow 64, the first and second magnets 52 and 54 are moved together with the magnet mounting member 42.

  When attached to the operation moving member 22, the first magnet 52 and the second magnet 54 face each other and are disposed so that the same poles of the magnets 52 and 54 face each other. That is, the N pole (or S pole) of the first magnet 52 and the N pole (or S pole) of the second magnet 54 are arranged to face each other.

  Between the first and second magnets 52 and 44, magnetic flux detecting means 56 for detecting changes in these magnetic fluxes is disposed. The magnetic flux detection means 56 is composed of, for example, a linear Hall IC, and is disposed and electrically connected to, for example, a circuit board (not shown) attached to the housing main body 34. The detection output of the magnetic flux detection means 56 is the same as that shown in FIG. 6 from the initial position (position where the magnetic flux detection means 56 is close to the first magnet 52) of the operation moving member 22 (first and second magnets 52, 54) shown in FIG. 7 (position where the magnetic flux detection means 56 is close to the second magnet 54), the detection signal (detection output) of the magnetic flux detection means 56 changes as shown in FIG. 7 moves from the initial position shown in FIG. 7 to the maximum operation position shown in FIG. 7, and the magnitude of the detection signal gradually increases in a substantially straight line. For example, it is obtained by using a linear Hall IC and arranging the first and second magnets 52 and 54 so that their same poles face each other.

  In this electric power tool, a coil spring 66 (functioning as an elastic biasing member) is mounted by fitting the moving shaft portion 28 of the operation moving member 22, and one end side of the coil spring 66 is a sliding sleeve 40 (specifically, The other end side is in contact with the large-diameter shaft portion 69 of the operation moving member 22. The coil spring 66 interposed between the sliding sleeve 40 and the operation moving member 22 elastically biases the operation moving member 22 to the right side (that is, the direction opposite to the direction indicated by the arrow 64) in FIG. Thereby, the operation moving member 22 is held at the initial position (non-operation position) shown in FIG.

  In this electric power tool, a projecting portion 68 projecting radially outward is provided at one end portion (right end portion in FIG. 2) of the sliding sleeve 40, and a housing body corresponding to the projecting portion 68 is provided. An action protrusion 70 is provided on 34 (first housing member 30). With this configuration, when the operation moving member 22 is in the initial position, as shown in FIG. 2, the protrusion 68 of the sliding sleeve 40 does not come into contact with the action protrusion 70 on the housing body 34 side. However, when the operation moving member 22 is slightly moved in the operation direction indicated by the arrow 64, as shown in FIG. 5, the protrusion 68 abuts against the action protrusion 70 on the housing main body 34 side, and this contact state When the operation moving member 22 is further moved in the operation direction from the position shown in FIG. 6, the operation moving member 22 and the magnet mounting member 42 (both the first and second magnets 52 and 54) are moved with respect to the sliding sleeve 40. Is relatively moved in the operation direction.

  Further, a pressing protrusion 72 that protrudes radially outward is provided at the other end portion (left end portion in FIG. 2) of the sliding sleeve 40, and the housing main body 34 side corresponds to the pressing protrusion 72. Specifically, the main switch 74 is disposed on a circuit board (not shown) attached to the housing body 34. With this configuration, when the operation moving member 22 is in the initial position, as shown in FIG. 2, the pressing protrusion 70 of the sliding sleeve 40 does not press the main switch 74 on the housing body 34 side. However, when the operation moving member 22 is slightly moved in the operation direction indicated by the arrow 64, the pressing protrusion 70 presses the main switch 74 on the housing body 34 side as shown in FIG. Is turned on, and current is supplied to the electric system (for example, the controller 18) of the power tool.

  In this embodiment, an initial position holding projection 78 (see FIG. 4) is further provided at a predetermined portion of the housing main body 34 (specifically, the first housing member 30). When the sliding sleeve 40 is elastically biased to the left in FIG. 2 by the coil spring 66, the rear end of the sliding sleeve 40 comes into contact with the initial position holding projection 78 and is prevented from moving. In the contact state, the coil spring 66 elastically biases the operation moving member 22 to the right in FIG. 2, and the magnet mounting member 42 abuts against the sliding sleeve 40, whereby the operation moving member 22 is The initial position shown in FIG. In relation to this, a receiving portion 79 that receives the initial position holding projection 78 is provided at one end of the magnet attachment member 42. The initial position holding projection 78 may be provided on the second housing member 32 in addition to the first housing member 30.

  The operation of this electric tool is controlled by the control system shown in FIG. In FIG. 8, the controller 18 for controlling the electric power tool includes a control means 82 composed of, for example, a microprocessor electrically mounted on the control circuit board, and a detection signal from the magnetic flux detection means 56 is supplied to the controller 18. And an operation signal from the main switch 74 is also sent.

  The illustrated control means 80 includes a rotation speed setting means 82, a speed signal generation means 84, and a motor drive means 86. The rotation speed setting means 82 is electrically driven as described later based on a detection signal from the magnetic flux detection means 56. The rotation speed of the motor 10 is set, the speed signal generation means 84 generates a speed signal corresponding to the rotation speed set by the rotation speed setting means 82, and the motor drive means 86 is generated by the speed signal generation means 84. The electric motor 10 is driven as required based on the speed signal.

  In this embodiment, the control means 82 further includes a memory means 88. In this memory means 8, various voltage values set in relation to the detection signal of the magnetic flux detection means 56, that is, the electric motor 10 is rotated at a low speed. A low speed rotation value V1 to be set, a medium speed rotation value V2 to set the electric motor 10 to medium speed rotation, and a high speed rotation value V3 to set the electric motor 10 to high speed rotation are registered. Therefore, when the detection signal of the magnetic flux detection means 56 becomes the low speed rotation value V1 (or medium speed rotation value V2, high speed rotation value V3) or more, the rotation speed setting means 82 sets low speed rotation (or medium speed rotation, high speed rotation). Then, the rotation speed signal generation means 84 generates a low speed signal (or medium speed signal, high speed signal) based on the low speed rotation (or medium speed rotation, high speed rotation) set by the rotation speed setting means 82, The motor driving unit 86 rotationally drives the electric motor 10 at a low speed (or medium speed or high speed) based on the generated low speed signal (or medium speed signal or high speed signal).

  Next, the operation of this electric power tool will be described mainly with reference to FIGS. 1, 2, 5, 6 and 8. When the work is performed by rotating the drill 8, the operation portion 26 of the operation moving member 22 may be pressed in the operation direction indicated by the arrow 64 (FIG. 2). As a result, the operation moving member 22 is slid in the operation direction indicated by the arrow 64, and the magnet mounting member 42 (and the first and second magnets 52, 54 together with this operation moving member 22) is integrated in the operation direction. Moved.

  When the magnet mounting member 42 is slightly slid in the operation direction in this way, as shown in FIG. 5, the sliding sleeve 40 moves over the initial position holding projection 78 by the action of the coil spring 66 and moves in the operation direction. . Thus, the protrusion 68 of the sliding sleeve 40 abuts against the action protrusion 70 on the housing main body 34 side and is prevented from moving. Thereafter, the operation moving member 22 and the magnet mounting member 42 are moved with respect to the sliding member 40. Is relatively moved in the operation direction. Further, in this contact state, the pressing protrusion 72 of the sliding sleeve 40 presses the main switch 74 and is kept on, whereby current from the battery 16 is supplied to the controller 18 and the like.

  When the operation moving member 22 is further moved in the operation direction, the relative movement of the first and second magnets 52 and 54 with respect to the magnetic flux detection means 56 increases, and thereby the detection signal of the magnetic flux detection means 56 changes. When the first and second magnets 52 and 54 move relative to the magnetic flux detection means 56, the rotation of the detection signal of the magnetic detection means 56 becomes a low speed value V1 (or medium speed value V2, high speed value V3 or more). The speed setting means 82 sets a low rotation speed (or medium rotation speed, high rotation speed), and based on such setting, the speed signal generation means 84 generates a low speed signal (or medium speed signal, high speed signal), and the motor. The drive means 86 is driven to rotate the electric motor 10 at a low speed (or medium speed or high speed) based on the low speed signal (or medium speed signal or high speed signal). The rotational speed of the electric motor 10 (in other words, the work tool such as the drill 8) can be adjusted as required according to the amount of operation movement of the operation moving member 22 using one magnetic flux detection means 56.

  In the above-described embodiment, the rotation speed of the electric motor 10 is configured to be set at three levels of low speed, medium speed, and high speed, but between the low speed value V1 and the high speed value V3 of the magnetic flux detection means 56. For example, by setting two speed values in the range, for example, by setting a medium low speed value V21 and a medium high speed value V22, it can be set in four stages of low speed, medium low speed, medium high speed and high speed. By setting three or more values in the range between them, the poisoning degree of the electric motor 10 can be set to five or more levels.

  As mentioned above, although the electric tool according to the present invention was applied to the drill driver, the present invention can be similarly applied to other electric tools such as a grinder.

DESCRIPTION OF SYMBOLS 2 Electric tool main body 4 Main body part 6 Grasp part 10 Electric motor 18 Controller 20 Trigger switch means 22 Operation moving member 24 Movement detection part 34 Housing main body 40 Sliding sleeve 42 Magnet mounting member 52, 54 Magnet 56 Magnetic flux detection means 66 Coil spring 80 Control means 82 Rotational speed setting means 84 Speed signal generating means

Claims (5)

An electric tool main body, an electric motor built in the electric tool main body, a work tool rotated by the electric motor, trigger switch means for changing the rotation speed of the electric motor, and the trigger switch means In an electric tool comprising a rotation speed setting means for setting the rotation speed of the electric motor based on a detection signal,
The trigger switch means is disposed between the operation moving member slidably mounted on the electric tool main body, first and second magnets disposed to face each other, and the first and second magnets. Magnetic flux detection means, wherein the first and second magnets are arranged on the operation moving member side, the magnetic flux detection means is arranged on the electric tool body side, and the rotational speed setting means is An electric tool characterized by setting a rotation speed of the electric motor based on a detection signal from a magnetic flux detection means.   A magnet attachment member is attached to the operation moving member of the trigger switch means, and the first and second magnets are attached to the magnet attachment member so that the same poles face each other, The electric power tool according to claim 1, wherein the magnetic flux detecting means disposed is a Hall IC.   The trigger switch means includes a housing body that houses the first and second magnets and the magnet mounting member, and the operation moving member includes an operation portion and a moving shaft portion that extends from the operation portion into the housing body. And a sliding sleeve is slidably supported on the moving shaft portion, and the magnet mounting member is attached to a distal end portion of the moving shaft portion, between the operation moving member and the sliding sleeve. A coil spring is interposed between the movable shaft and the sliding sleeve, and the sliding sleeve is provided with a protruding portion protruding radially outward. The housing body has the protruding portion of the sliding sleeve. The power tool according to claim 2, further comprising an action protrusion that acts on the portion.   The housing body is provided with an initial position holding projection corresponding to the initial position of the operation moving member, and the sliding sleeve side is applied corresponding to the initial position holding projection on the housing body side. A contact portion is provided, and when the operation moving member is in the initial position, the contact portion on the sliding sleeve side is in contact with the initial position holding protrusion on the housing body side. The power tool according to claim 3. A pair of first guide protrusions extending in the sliding direction of the operation moving member is provided on the inner surface of the one side wall of the housing body, and the inner surface of the other surface wall extends in the sliding direction of the operation moving member. A pair of second guide protrusions are provided, and the sliding sleeve and the magnet mounting member are slid along the pair of first guide protrusions and the pair of second guide protrusions. The electric tool according to claim 3 or 4.

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