JP5857267B2 - Electric tool - Google Patents

Description

  The present invention relates to an electric tool for manually screwing using a tip tool provided in an output section.

  In Patent Document 1, an impact-type screw that includes a hammer and an anvil, rotates the hammer with an electric motor, and hits the anvil with the hammer to add shocking torque to the screw tightening bit attached to the anvil. A fastening machine is disclosed. This screw tightener is equipped with a lock mechanism that makes the anvil non-rotatable with respect to the body case of the screw tightener, and is manually screwed using a screw tightening bit that is attached to the anvil by locking the anvil. Can be tightened.

  In the lock mechanism, an anvil is disposed on the inner peripheral side of the engagement ring fixed to the main body case, and a columnar engagement member is provided between the engagement ring and a flat relief surface provided on the peripheral surface of the anvil. Has been placed. When the main body case is rotated relative to the anvil, the engaging member moves between the engaging ring and the end of the escape surface due to friction with the engaging ring, and bites into the engaging member. This prevents the anvil from rotating relative to the body case.

JP 2007-283471 A

  In Patent Document 1, in order to make the anvil non-rotatable as described above, when the main body case is rotated with respect to the anvil, the position where the engagement member is caught between the engagement ring and the end of the relief surface Need to be moved to. However, in order to move the engagement member in the narrow gap between the engagement ring and the anvil in this way, a highly accurate engagement ring, engagement member, and anvil are required. Moreover, since it is necessary to accurately position and arrange these, other parts are also required to have high dimensional accuracy, and there is a concern that many high-precision parts are required and the cost increases.

  This invention is made | formed in view of the said situation, Comprising: It aims at providing the electric tool which can make an output part non-rotatable by a simple mechanism.

In order to solve the above problems, an electric power tool of the present invention includes an impact mechanism having a hammer and an anvil, and the hammer is driven to rotate by the power of a motor, and the anvil shaft is hit by the hammer. A power ring for transmitting a rotational force to the tip tool held by the lock ring having a spline portion engageable with the outer peripheral portion of the anvil on the inner peripheral portion, a switch, and an operation of the switch interlocking mechanism of the locking ring the spline portion is moved from the unlocked position in which the engagement is disengaged with the outer peripheral portion of the anvil to the locked position for disabling rotate the anvil engages the outer peripheral portion of the anvil in accordance with the door, anvil nails get hit the hammer protruding on the outer circumferential side to the anvil are formed, the locking ring is the Characterized in that the spline portion is engaged with the anvil claw is to unrotatable the anvil.

  In addition, the switch is a drive switch that switches ON / OFF of the motor, and the interlocking mechanism connects the switch and the lock ring, and the lock ring is unlocked according to the operation of the switch to the ON side. It is preferable that the lock ring is moved to the lock position and the lock ring is moved to the lock position according to the operation of the switch to the OFF side.

  In addition, the switch is positioned between the forward rotation position for rotating the motor in the forward direction, the reverse rotation position for rotating the motor in the reverse direction, and between the forward rotation position and the reverse rotation position and turning the motor off. A seesaw switch that can be switched to a position is preferable.

  Moreover, it is preferable that the switch is a trigger switch for controlling driving of the motor.

  In the present invention, the output unit can be made non-rotatable by a simple mechanism.

It is sectional drawing of the electric tool of 1st embodiment. It is AA sectional drawing of FIG. It is principal part sectional drawing which shows the state which has arrange | positioned the lock ring of the electric tool same as the above in the lock position. Seesaw switch and connecting part when the same seesaw switch is placed in the middle position The material is shown, (a) is a front view, (b) is a plan view. It is BB sectional drawing of FIG. The seesaw switch and connecting member when the seesaw switch is arranged in the forward rotation position are shown, (a) is a front view, and (b) is a plan view. The seesaw switch and connection member when the seesaw switch is arranged in the reverse rotation position are shown, (a) is a front view, and (b) is a plan view. It is principal part sectional drawing which shows the electric tool of 2nd embodiment. It is sectional drawing which shows the engagement state of a lock ring and an anvil nail | claw in CC section of FIG. It is a top view of the seesaw switch arrange | positioned in the intermediate position same as the above. It is principal part sectional drawing of the electric tool of 3rd embodiment. It is principal part sectional drawing of an electric tool same as the above. It is sectional drawing which shows a trigger switch same as the above, a connection member, a lock ring, an anvil, and a cylinder. It is principal part sectional drawing of an electric tool when the trigger switch same as the above is drawn. It is principal part sectional drawing of an electric tool same as the above.

  Hereinafter, the present invention will be described with reference to the accompanying drawings.

(First embodiment)
A power tool 1 according to the first embodiment shown in FIGS. 1 to 7 is an impact rotary tool including an impact mechanism having a hammer 3 and an anvil 4.

  As shown in FIG. 1, the outer shell of the electric power tool 1 is composed of a substantially cylindrical casing 8 and a substantially cylindrical grip 7 having one end rotatably connected to the end of the casing 8. Yes. The grip 7 gripped in use can be arranged in line with the casing 8 by rotation with respect to the casing 8, or can be protruded in a direction intersecting the casing 8 as shown in FIG. . Hereinafter, the axial direction of the casing 8 will be referred to as the front-rear direction, the side where the grip 7 of the casing 8 is connected will be referred to as the rear side, and the rotational axis direction of the grip 7 will be described as the left-right direction.

  In the casing 8, the motor 2, the speed reduction mechanism 9, and the impact mechanism are housed in order from the rear side to the front side. A battery pack 6 serving as a power source is provided inside the grip 7.

  The motor 2 is electrically connected to the battery pack 6 via a switch 5 provided at the rear end portion of the casing 8, whereby electric power is supplied from the battery pack 6. By switching the switch 5, the motor 2 can be switched ON / OFF.

The switch 5 is a seesaw switch 10, and as shown in FIG. 4 , a switch body 39 having a circular shape when viewed from the front, and an operating body 40 that is swingably supported by the switch body 39 in a substantially arc shape along the outer peripheral surface of the switch body 39. have. The operating body 40 can move up and down along the outer peripheral surface of the switch body 39 by swinging with respect to the switch body 39. An operation portion 41 that protrudes outward and is exposed to the outer surface of the casing 8 is formed at the center in the circumferential direction of the substantially arc-shaped operation body 40.

The operating body 40 is operated by manually operating the operation unit 41, whereby the forward rotation position shown in FIG. 6, the reverse rotation position shown in FIG. 7, and the intermediate position shown in FIG. 4 between the normal rotation position and the reverse rotation position. And can be moved. When the operating body 40 is moved to the normal rotation position, the output shaft 15 of the motor 2 rotates in the normal direction, and the anvil 4 constituting the output part of the electric tool 1 rotates in the direction in which the screw is tightened. When the operating body 40 is moved to the reverse rotation position, the output shaft 15 of the motor 2 rotates reversely, and the anvil 4 rotates in the direction of loosening the screw. Further, when the operating body 40 is moved to an intermediate position where the operation body 40 is in a neutral state, the motor 2 is stopped.

  The power of the motor 2 is decelerated by the reduction mechanism 9 shown in FIG. The speed reduction mechanism 9 of this embodiment is a planetary gear mechanism, and includes a sun gear 11, a planet gear 12, a ring gear 13, and a carrier 14.

  The sun gear 11 is fixed to the output shaft 15 of the motor 2 and rotates together with the output shaft 15. The ring gear 13 is fixed to the casing 8 so as not to rotate, and is disposed around the sun gear 11. The planet gear 12 is disposed between the sun gear 11 and the ring gear 13, and a plurality of planet gears 12 are provided in the circumferential direction of the sun gear 11. Each planet gear 12 meshes with both the sun gear 11 and the ring gear 13, and rotates while revolving around the sun gear 11 as the sun gear 11 rotates. Each planet gear 12 is rotatably connected to the carrier 14 via a connecting pin 18 provided at the center that is the center of rotation.

  The carrier 14 rotates concentrically with the rotation center axis of the sun gear 11 as the plurality of planet gears 12 revolve. A drive shaft portion 19 that protrudes forward is formed at a center portion that is the rotation center of the carrier 14. The drive shaft portion 19 is rotatably inserted into a hole 20 penetrating in the front-rear direction formed in the center portion of the hammer 3.

  A carrier-side cam groove 22 is formed on the outer peripheral surface of the drive shaft portion 19. A hammer side cam groove 23 is formed at a location corresponding to each carrier side cam groove 22 on the inner peripheral surface of the hole 20 of the hammer 3. Each hammer-side cam groove 23 is fitted with the other half of the steel ball 21 in which one half of the steel ball 21 is fitted into the corresponding carrier-side cam groove 22, so that the hammer 3 passes through the plurality of steel balls 21. It is connected to the drive shaft portion 19.

  Each carrier-side cam groove 22 is formed in a V shape that opens to the rear side. Each steel ball 21 is movable in the V-shaped carrier-side cam groove 22, whereby the hammer 3 is moved in the front-rear direction by the guide of the carrier-side cam groove 22 as the drive shaft 19 rotates. It is supposed to be.

  A spring 24 is provided between the hammer 3 and the rear end portion of the carrier 14 positioned behind the hammer 3 as a biasing means for biasing the hammer 3 toward the front anvil 4. An impact mechanism is constituted by the anvil 4.

  When the motor 2 is stopped, the hammer 3 is set to be disposed at the forward position shown in FIG. 3 by the urging force of the spring 24. At this time, each steel ball 21 is disposed at the front end of the carrier-side cam groove 22. The When the hammer 3 rotates with respect to the drive shaft 19 of the carrier 14 from this state, each steel ball 21 moves to the rear side in the carrier-side cam groove 22, and the hammer 3 is spring-loaded by the guide of these steel balls 21. Retreats against the drive shaft 19 against the elastic force of 24. Further, when the torque with respect to the drive shaft portion 19 of the hammer 3 is reduced, the hammer 3 is returned to the advanced position by the elastic force of the spring 24, and at the same time, each steel ball 21 is moved to the front end portion of the carrier side cam groove 22.

  The anvil 4 has a shaft portion 16 protruding forward. The front end portion of the shaft portion 16 is rotatably supported by the front end portion of the casing 8. An insertion hole 27 is formed at the center of the rear end surface of the shaft portion 16, and a shaft support portion 28 protruding forward from the center portion of the drive shaft portion 19 of the carrier 14 is rotatably inserted into the insertion hole 27. The anvil 4 is pivotally supported on the carrier 14 by the pivotal support 28. Thus, the anvil 4 is provided concentrically with the rotation axis of the carrier 14 so as to be rotatable. In addition, the movement of the anvil 4 in the front-rear direction is restricted.

  The anvil 4 has an anvil claw 26 that protrudes integrally from the rear end portion of the shaft portion 16 toward the outer peripheral side. A plurality of anvil claws 26 are formed in the circumferential direction of the shaft portion 16. On the other hand, a hammer claw 25 protruding forward is formed on the hammer 3, and the same number of hammer claws 25 as the anvil claws 26 are formed in the circumferential direction of the hammer 3. The number of hammer claws 25 and the number of anvil claws 26 may be different.

  As shown in FIG. 1, when the hammer 3 is in the forward position, each hammer claw 25 is disposed at the same position in the front-rear direction as each anvil claw 26, and can come into contact with the side surface of the anvil claw 26.

  A chuck mechanism 17 that protrudes forward from the front end portion of the casing 8 is provided at the front end portion of the shaft portion 16 of the anvil 4. A tip tool such as a driver bit (not shown) is detachably attached to the chuck mechanism 17 so that the tip tool is held by the anvil 4.

  In order to tighten a screw, a nut, or the like using the electric tool 1, the seesaw switch 10 is switched to the normal rotation position with the tip tool mounted on the chuck mechanism 17. If it does in this way, the output shaft 15 of the motor 2 will rotate forward, and the hammer 3 in the said advance position will rotate forward with the carrier 14 of the deceleration mechanism 9. FIG. Thereby, each hammer nail | claw 25 engages with the side surface of the anvil nail | claw 26, and the anvil 4 and a front-end tool rotate with the said hammer 3 in the direction which tightens a screw and a nut.

  When the screw or nut is loosened, the seesaw switch 10 is switched to the reverse rotation position. If it does in this way, the output shaft 15 of the motor 2 will reversely rotate, and the hammer 3 in an advance position will reversely rotate with the carrier 14 of the deceleration mechanism 9. FIG. Thereby, each hammer nail | claw 25 engages with the side surface of the anvil nail | claw 26, and the anvil 4 and a front-end tool rotate with the said hammer 3 in the direction which loosens a screw and a nut.

  When the load applied to the anvil 4 from the screw or nut through the tip tool increases when the motor 2 is driven, each hammer pawl 25 gets over the anvil pawl 26 and is disengaged from the anvil pawl 26, and the hammer 3 springs. Retreat against 24. When the hammer 3 retreats and disengages from the anvil 4 in this way, the hammer 3 turns forward due to the elastic force of the spring 24. When the hammer 3 moves forward to the forward movement position, the side surface of the anvil claw 26 is hit by each hammer claw 25 of the hammer 3 that rotates together with the carrier 14, whereby a strong rotational force is transmitted to the anvil 4, and this rotational force is further increased. Is transmitted to the tip tool. Thereafter, each time the load applied to the anvil 4 is increased, the hammer 3 is struck by the hammer 3, whereby the screws and nuts can be tightened or loosened by shocking torque generated intermittently.

  The electric power tool 1 includes a lock mechanism that disables rotation of the anvil 4 as an output unit when the motor 2 is stopped. By providing this locking mechanism, it is possible to perform operations such as tightening screws by manually gripping the grip 7 and manually rotating the casing 8 using the tip tool mounted on the anvil 4 as in the case of a hand driver. it can.

  The lock mechanism makes the anvil 4 non-rotatable when the operation body 40 of the seesaw switch 10 is switched to the OFF side (that is, the intermediate position side), and the operation body 40 is turned to the ON side (that is, the forward rotation position and the reverse rotation position). The anvil 4 can be rotated when switched.

  The lock mechanism moves the lock ring 30 that can be engaged with the anvil 4, and the lock ring 30 to the locked position that engages the anvil 4 and the unlocked position that does not engage the anvil 4 according to the operation of the seesaw switch 10. It consists of an interlocking mechanism.

As shown in FIG. 5 , the lock ring 30 is formed in an annular shape whose outer peripheral surface is substantially rectangular and non-circular, and is not rotatable on the holding portion 33 formed on the inner peripheral surface of the casing 8 and in the front-rear direction. It is fitted freely.

  The lock ring 30 is provided at a position surrounding the shaft portion 16 of the anvil 4 so as to be movable in the front-rear direction. A spline portion 32 is formed on the inner peripheral surface of the lock ring 30 in the circumferential direction. The spline portion 32 is composed of a chevron tooth portion 31 formed in a plurality in the circumferential direction on the inner peripheral surface of the lock ring 30. The top surface of each tooth portion 31 protruding inward of the spline portion 32 and the back surface of each concave portion 37 formed between these tooth portions 31 are formed in an arc shape when viewed from the front, and the top surface of the tooth portion 31 The inner surface of the recess 37 is smoothly connected without a ridgeline.

As shown in FIG. 1, a hook-like engagement portion 34 that protrudes toward the outer peripheral side is integrally formed in the circumferential direction on the outer peripheral surface of the portion of the shaft portion 16 of the anvil 4 that is positioned in front of the anvil claw 26. ing. As shown in FIG. 5 , a spline portion 35 that can be engaged with the spline portion 32 of the lock ring 30 is formed on the outer peripheral end surface of the engagement portion 34 in the circumferential direction. The spline portion 35 is also composed of a plurality of chevron teeth 36 formed on the outer peripheral surface of the engaging portion 34 in the circumferential direction. Each spline 35 is formed between the top surface of each tooth 36 and the teeth 36. The inner surface of the recess 44 is formed in an arc shape when viewed from the front and is smoothly connected. In addition, the shape of the spline parts 32 and 35 is not limited to the above, and may be another shape.

As shown in FIG. 5 , the lock ring 30 fits a large number of teeth 31 constituting the spline portion 32 into recesses 44 formed between a large number of teeth 36 constituting the spline portion 35 of the anvil 4. By engaging with each other, the anvil 4 is engaged. Thereby, the anvil 4 becomes non-rotatable.

  As shown in FIG. 1, the interlock mechanism connects the lock ring 30 and the operating body 40 of the seesaw switch 10, and mechanically transmits the operation of the operating body 40 to the lock ring 30 to move the lock ring 30. The member 38 is configured.

  The connecting members 38 are provided above and below the casing 8, and each connecting member 38 is movable in the front-rear direction. Each connecting member 38 formed in a bar shape has one end connected to the operating body 40 of the seesaw switch 10 and the other end connected to the lock ring 30.

As shown in FIG. 4 (b), the seesaw switch 10 to which each connecting member 38 is connected has V-shaped guide grooves 42 opened on the rear side on both sides in the circumferential direction of the arc-shaped operating body 40. Is formed. The rear end portion of each connecting member 38 is an inserted portion 43 bent at a right angle in the vertical direction, and the inserted portion 43 of each connecting member 38 is slidably inserted into the corresponding guide groove 42.

  As shown in FIGS. 6 and 7, when the operating body 40 of the seesaw switch 10 is on the ON side (that is, the forward rotation position and the reverse rotation position), the inserted portion 43 of each connecting member 38 is the rear end of the guide groove 42. At this time, each connecting member 38 is disposed at the retracted position shown in FIG. In a state where each connecting member 38 is disposed at the retracted position, the lock ring 30 is disposed at the unlocked position shifted rearward from the engaging portion 34 of the anvil 4. Thus, in a state where the lock ring 30 is disposed at the unlock position, the spline portion 32 does not engage with the spline portion 35 of the anvil 4 and the anvil 4 can rotate.

When the operating body 40 arranged on the ON side as described above is moved to the OFF side (that is, the intermediate position) as shown in FIG. 4 , the inserted portion 43 of each connecting member 38 is guided by the guide groove 42 under the guide groove. It moves to the front-end part of 42, and each connection member 38 is arrange | positioned in the advance position shown in FIG. In this state, the lock ring 30 is disposed at a lock position where it overlaps with the engaging portion 34 of the anvil 4 in the front-rear direction, and the spline portion 32 engages with the spline portion 35 of the anvil 4 so that the anvil 4 cannot rotate.

When the operating body 40 arranged on the OFF side shown in FIG. 4 is moved to the ON side shown in FIGS. 6 and 7, the inserted portion 43 of each connecting member 38 moves to the rear end portion of the guide groove 42, and each connecting member 38 moves to the retracted position, and the lock ring 30 moves to the unlocked position.

  Further, when the operating body 40 is moved to the ON side as described above, after the engagement between the lock ring 30 and the anvil 4 is released, the contact of the switch body 39 is switched to the conductive state, and the motor 2 is driven. Is set to

  The electric power tool 1 according to the present embodiment described above includes an output portion (anvil 4) that is rotationally driven by the motor 2, and a lock ring 30 in which a spline portion 32 that can be engaged with the outer peripheral portion of the output portion is formed on the inner peripheral portion. And a switch 5. Further, according to the operation of the switch 5, the lock ring 30 is engaged with the outer peripheral portion of the output portion from the unlocked position where the spline portion 32 is disengaged from the outer peripheral portion of the output portion, thereby making the output portion non-rotatable. An interlocking mechanism (connecting member 38) that moves to the locked position is provided. With this configuration, the spline portion 32 of the lock ring 30 is engaged with the outer peripheral portion of the output portion to make the anvil 4 unrotatable, and the electric tool 1 is rotated so that the tip tool held by the output portion is used. Screws can be tightened. Further, this lock mechanism has a simple structure in which the spline portion 32 of the lock ring 30 is engaged with the outer peripheral portion of the output portion, and does not require a large number of high-precision parts, and can reduce the cost.

  Further, the interlocking mechanism (the connecting member 38) of the present embodiment connects the switch 5 that functions as a drive switch for the motor 2 and the lock ring 30. This interlocking mechanism moves the lock ring 30 to the unlock position according to the operation of the switch 5 to the ON side, and moves the lock ring 30 to the lock position according to the operation of the switch 5 to the OFF side. . With this configuration, the output unit can be rotated by automatically moving the lock ring 30 to the unlock position by simply switching the switch 5 to the ON side in order to drive the motor 2. Further, by simply switching the switch 5 to the OFF side in order to stop the motor 2, it is possible to automatically move the lock ring 30 to the lock position so that the output unit cannot be rotated. That is, it is not necessary to separately perform an operation for moving the lock ring 30 regardless of whether the electric tool 1 is used electrically or when the electric tool 1 is used manually, and the operability is improved.

  In addition, the switch 5 of the present embodiment is located between the forward rotation position where the motor 2 is rotated forward, the reverse rotation position where the motor 2 is rotated backward, and the forward rotation position and the reverse rotation position. The seesaw switch 10 can be switched to an intermediate position. In other words, in the present embodiment, in the electric tool 1 employing such a seesaw switch 10, the output unit can be made non-rotatable by a simple mechanism.

  The electric power tool 1 includes an impact mechanism having a hammer 3 and an anvil 4. The hammer 3 is driven to rotate by the motor 2, and the anvil 4 is hit by the hammer 3 and held by the shaft portion 16 of the anvil 4. This is an electric tool that transmits rotational force to the tip tool. In the present embodiment, on the anvil 4 side, the impact-type electric tool 1 outputs only by forming the engaging portion 34 that engages the spline portion 32 of the lock ring 30 on the outer peripheral surface of the shaft portion 16. A locking mechanism that locks the anvil 4 as a part can be provided. Further, it is possible to form the spline portion 35 over the outer peripheral surface of the engaging portion 34 by providing the engaging portion 34 over the circumferential direction of the shaft portion 16 as in the present embodiment. In this case, the lock ring 30 can be firmly engaged with the anvil 4 so that the anvil 4 cannot be rotated, and it is possible to perform operations such as manual screw tightening described above with a stronger force.

(Second embodiment)
Next, a second embodiment will be described. In addition, below, the same number is provided about the same structure as 1st embodiment, and the overlapping description is abbreviate | omitted.

  In the electric power tool 1 according to this embodiment shown in FIGS. 8 to 10, the engaging part 34 is not formed on the anvil 4, and the spline part 32 of the lock ring 30 engages with the anvil claw 26 to rotate the anvil 4. It is supposed to be impossible.

  As shown in FIG. 9, an engaging portion 45 that can engage with the spline portion 32 of the lock ring 30 is formed on the front end surface of each anvil claw 26 that protrudes outward from the shaft portion 16 of the anvil 4. . Each engaging portion 45 is constituted by a plurality of teeth 46 formed in the width direction of the anvil claw 26. In addition, when the spline portion 32 of the lock ring 30 is engaged with the engaging portion 45 of the anvil claw 26, the tooth portion 31 of the spline portion 32 and each of the engaging portions 45 are surely prevented from rotating. The tooth portion 46 is formed in a trapezoidal shape having a corner.

  In addition, the shape of the tooth part 31 of the spline part 32 and the tooth part 46 of each engaging part 45 is not limited to the said trapezoid shape, Other shapes may be sufficient. Further, as shown in FIG. 9, the lock ring 30 of the present embodiment has a circular outer peripheral surface, but of course, the lock ring 30 is provided so as not to rotate with respect to the casing 8. Further, the outer peripheral surface of the lock ring 30 of the present embodiment may be non-rotatable with respect to the casing 8 by making it non-circular as in the first embodiment.

  As shown in FIG. 10, in the operating body 40 of the seesaw switch 10, the guide groove 42 into which the inserted portion 43 of each connecting member 38 is inserted is formed in a V shape that opens to the front side. That is, when the operating body 40 is arranged on the ON side (that is, the forward rotation position and the reverse rotation position), the inserted portion 43 of each connecting member 38 is positioned at the front end portion of the guide groove 42 as shown in FIG. The connecting member 38 is disposed at the advanced position shown in FIG. The lock ring 30 in this state is arranged at a position shifted forward from the anvil claw 26, that is, at an unlock position where the anvil 4 can rotate.

  When the operating body 40 is moved to the OFF side (that is, the intermediate position side) with the operating body 40 disposed on the ON side, the inserted portion 43 of each connecting member 38 moves to the rear end portion of the guide groove 42. The connecting member 38 is disposed at the retracted position. In this state, the lock ring 30 overlaps the anvil claw 26 in the front-rear direction, that is, a part of the spline portion 32 in the circumferential direction engages with the engagement portion 45 of each anvil claw 26 so that the anvil 4 cannot rotate. It is placed in the lock position.

  In this embodiment, the spline part 32 of the lock ring 30 engages with the anvil claw 26 to make the anvil 4 non-rotatable. For this reason, in order to engage the spline part 32 with the anvil 4, it is not necessary to form a part like the engaging part 34 of 1st embodiment, and the anvil 4 can be made into a simple shape.

(Third embodiment)
Next, a third embodiment will be described. In addition, below, the same number is provided about the same structure as 1st embodiment, and the overlapping description is abbreviate | omitted.

  In the electric power tool 1 according to the present embodiment shown in FIGS. 11 to 15, the switch 5 that controls the driving of the motor 2 includes a trigger switch 48 that changes the rotational speed of the motor 2.

  As shown in FIG. 11 and the like, the trigger switch 48 is provided on the grip 7 in a housing 47 that is an outer shell of the electric power tool 1 constituted by the casing 8 and the grip 7. Note that the grip 7 of the present embodiment protrudes from the casing 8 toward the lower side intersecting the axial direction of the casing 8, and is fixed to the casing 8.

  The trigger switch 48 includes a switch main body 49 provided at the upper end portion of the grip 7 and an operation body 50 that protrudes forward from the upper end portion of the grip 7.

  The operating body 50 is provided so as to be movable in the front-rear direction within a predetermined range with respect to the grip 7. The operating body 50 is pressed forward by an urging means (not shown) provided in the switch body 49, and is arranged at the forward position shown in FIGS. 11 and 12 when not operated, and the motor 2 is turned off. By pulling the operating body 50 backward as shown in FIGS. 14 and 15 with the finger of the hand gripping the grip 7 as shown in FIGS. 14 and 15, the switch body 49 operates and the motor 2 is driven. In addition, the rotational speed of the motor 2 increases as the pull-in amount of the switch body 49 increases.

  The lock mechanism makes the anvil 4 non-rotatable when the operating body 50 is in the forward position and the trigger switch 48 is switched to the OFF side, and when the operating body 50 is drawn and the trigger switch 48 is switched to the ON side. Make the anvil 4 rotatable.

  As in the second embodiment, the anvil 4 of the present embodiment is formed with the engaging portion 45 on the tip surface of each anvil claw 26, and the engaging portion 34 in the first embodiment is not formed. That is, the lock ring 30 included in the lock mechanism of the present embodiment makes the anvil 4 non-rotatable by engaging the spline portion 32 with the anvil claw 26. Further, the lock ring 30 is accommodated so as to be movable in the front-rear direction along the inner peripheral surface of a cylindrical cylindrical body 52 provided inside the casing 8.

  The interlocking mechanism included in the lock mechanism connects the lock ring 30 and the operating body 50 of the trigger switch 48, mechanically transmits the operation of the operating body 50 to the lock ring 30, and moves the lock ring 30. It consists of

  The connecting member 51 is provided in the casing 8 so as to be movable in the front-rear direction. The attachment body 53 attached to the lock ring 30 and one end portion are connected to the attachment body 53 and the other end portion is a trigger switch. It is comprised with the rod-shaped connection body 54 connected with the 48 operation bodies 50. As shown in FIG.

  As shown in FIG. 13, the mounted body 53 is formed in a semicircular arc shape when viewed from the front, and is provided so as to be movable in the front-rear direction along the lower outer peripheral surface of the cylindrical body 52 that houses the lock ring 30. Although the lock ring 30 shown in FIG. 13 has a circular outer peripheral surface, of course, the lock ring 30 is provided so as not to rotate with respect to the casing 8. The outer peripheral surface of the lock ring 30 is formed in a non-circular shape as in the first embodiment, and the inner peripheral surface of the cylindrical body 52 is shaped to match the outer peripheral surface of the lock ring 30, thereby making the lock ring 30 non-rotatable. Also good.

  Pins 55 that protrude into the cylindrical body 52 through long holes 56 (see FIG. 12) that are formed in the cylindrical body 52 and extend in the front-rear direction are provided at both ends in the circumferential direction of the attached body 53. Each pin 55 is connected to the lock ring 30 inside the cylindrical body 52, whereby the attached body 53 is attached to the lock ring 30. The front end portion of the connecting body 54 is connected to the lower end portion of the attached body 53, and the rear end portion of the connecting body 54 is bent downward and connected to the operating body 50 of the trigger switch 48.

  As shown in FIGS. 11 and 12, when the operating body 50 of the trigger switch 48 is in the forward movement position, the connecting member 51 is disposed in the forward movement position, and each pin 55 is disposed in the front end portion of the long hole 56. The lock ring 30 in this state is arranged at a position where it overlaps with the anvil claw 26 in the front-rear direction, that is, at a lock position where a part of the spline portion 32 in the circumferential direction engages with each anvil claw 26 to make the anvil 4 unrotatable. Is done.

  When the operating body 50 in the advanced position is pulled backward as shown in FIGS. 14 and 15, the connecting member 51 is disposed in the retracted position, and each pin 55 is disposed in the rear end portion of the long hole 56. The lock ring 30 in this state is disposed at a position shifted rearward from the anvil claw 26, that is, at an unlock position where the anvil 4 can be rotated.

  When the retracting of the operating body 50 is released or the pulling force is weakened, the operating body 50 is advanced to the forward position by the biasing means, the connecting member 51 is moved to the forward position, and the lock ring 30 is moved to the locked position. Moving.

  When the operating body 50 is retracted, the contact of the switch body 49 is switched to the conductive state after the engagement between the lock ring 30 and the anvil 4 is released, and the motor 2 is driven. .

  The switch 5 of the present embodiment is a trigger switch 48 that controls the driving of the motor 2. In the present embodiment, in the electric tool 1 employing such a trigger switch 48, the output unit (anvil 4) is rotated by a simple mechanism. Can be disabled.

  In the present embodiment, the lock ring 30 is engaged with the anvil claw 26. However, the lock ring 30 may be engaged with the shaft portion 16 of the anvil 4 as in the first embodiment.

  In each of the above embodiments, a switch may be provided separately from the switch 5 for switching the motor 2 ON / OFF, and the switch can be operated so that the lock ring 30 can be switched between the lock position and the unlock position. . Moreover, in each said embodiment, you may provide the interlocking mechanism which electrically detects operation | movement of the switch 5 and switches the lock ring 30 to a locked position and an unlock position based on this detection result. The present invention is also applicable to an electric drill that does not include an impact mechanism. That is, in this case, the output shaft that is driven to rotate by the motor and holds the tip tool may be made non-rotatable by using a lock ring having the same configuration as that of each of the embodiments.

DESCRIPTION OF SYMBOLS 1 Electric tool 2 Motor 3 Hammer 4 Anvil 5 Switch 10 Seesaw switch 16 Shaft part 26 Anvil claw 30 Lock ring 32 Spline part 34 Engagement part 38 Connecting member 48 Trigger switch 51 Connecting member

Claims (4)

An electric tool comprising an impact mechanism having a hammer and an anvil, rotating the hammer by the power of a motor, and striking the anvil with the hammer to transmit a rotational force to a tip tool held on the shaft portion of the anvil A lock ring in which a spline portion engageable with an outer peripheral portion of the anvil is formed on an inner peripheral portion, a switch, and the lock ring is connected to the outer periphery of the anvil according to the operation of the switch. from the unlocked position in which the engagement is disengaged with the parts engaged with the outer periphery of the anvil and a linkage mechanism for moving to the locked position for disabling rotation of said anvil, said hammer protrudes on the outer circumferential side to the anvil An anvil claw is formed to receive the blow, and the lock ring engages the spline portion with the anvil claw and Electric power tool, characterized in that the unrotatable the Nbiru.   The switch is a drive switch that switches ON / OFF of the motor, and the interlocking mechanism connects the switch and the lock ring, and the lock ring is moved to the unlock position according to the operation of the switch to the ON side. The power tool according to claim 1, wherein the lock ring is moved to the lock position in accordance with the operation of the switch to the OFF side.   A forward rotation position for forward rotation of the motor; a reverse rotation position for reverse rotation of the motor; and an intermediate position for turning the motor OFF between the forward rotation position and the reverse rotation position. The power tool according to claim 2, wherein the seesaw switch is switchable to the power tool. The power tool according to claim 2, wherein the switch is a trigger switch that controls driving of the motor .

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