JP2013146835A - Electric power tool - Google Patents

Abstract

Provided is an electric tool capable of tightening bolts, nuts, and screws by hand tightening when a motor is not driven.
A rotating shaft 32A is mounted on a rotor shaft 32A so as to rotate coaxially and can be engaged with a rotating fixing member 4C. By this engagement, the rotating member 32F and the rotor shaft 32A are temporarily fixed so as not to rotate. The block member 55 enters between the flange 41 </ b> A of the spindle 41 and the rear end of the hammer 53 when positioned at the uppermost position. When it is positioned at the lowest position, it is detached from between the flange 41A of the spindle 41 and the rear end of the hammer 53. When the trigger 26A is released, the rod 28 moves forward, the rotating member 32F engages with the rotating fixing member 4C, and the block member 55 is located at the uppermost position so that the flange 41A of the spindle 41 and the hammer 53 The rear end of the hammer 53 is prevented from entering the rear end.
[Selection] Figure 1

Description

  The present invention relates to a power tool, and more particularly, to a power tool that can apply a rotational force and a striking force in a rotational direction to a tip tool.

  An electric power tool such as an impact wrench includes a housing, a motor housed in the housing, a trigger switch for starting driving the motor, a hammer, and an anvil. An operator pulls the trigger switch and rotates the hammer by rotating the motor. A tip tool is attached to the anvil, and the rotational force and impact force of the hammer are transmitted to the anvil and the tip tool (see, for example, Patent Document 1).

JP 2009-078317 A

  An operator who uses an electric power tool does not pull the trigger switch and power is not supplied to the motor. There are cases where it is desired to tighten, i.e., hand tighten. However, since the tip tool is not fixed so as not to rotate with respect to the housing, even if the housing is gripped and rotated, it rotates relative to the housing and cannot be hand-tightened.

  Then, an object of this invention is to provide the electric tool which can tighten a volt | bolt, a nut, and a screw by hand tightening when the motor is not driving.

  In order to solve the above-described problems, the present invention provides a housing, a motor having an output shaft, accommodated in the housing, an anvil supported rotatably with respect to the housing, and connected to a tip tool, and the anvil. And a hammer that is rotatably supported with respect to the housing and is movable in a substantially axial direction of the output shaft, and a drive path from the motor to the hammer, There is provided a power tool including a regulating member that regulates rotation and retraction of the hammer. “Substantially coaxial” means that the anvil and the hammer are designed to be configured coaxially, but the actual product is not exactly coaxial within the error. To do. Similarly, “substantially axial direction” means that the hammer is designed to be movable in the axial direction of the output shaft, but the actual product is not strictly movable in the axial direction within an error range. Is included.

  By engaging with the drive path from the motor to the hammer, it is provided with a regulating member that regulates the rotation and retraction of the hammer. Therefore, the rotation and retraction of the hammer can be regulated by the regulating member. I can work.

  Here, it is preferable that a trigger switch for starting the rotational drive of the motor is provided, and the restriction / restriction of the rotation and retraction of the hammer by the restriction member is interlocked with the operation of the trigger switch. Since the regulation / cancellation of the rotation and retraction of the hammer by the regulating member is linked to the operation of the trigger switch, the operability can be improved.

  Further, it is preferable that the restriction of the hammer by the restriction member is released when the trigger switch is turned on from the off state. When the trigger switch is turned from the off state to the on state, the restriction of the hammer by the restriction member is released, so that the operability can be improved. It is also possible to prevent the trigger switch from being turned on when the hammer is regulated by mistake.

  The hammer is supported by the housing so as to be movable between a rotation transmission position and a rotation non-transmission position in the axial direction of the output shaft, and is rotated by the rotational force of the motor and is in the rotation transmission position. The control member is configured to be capable of rotating integrally with the anvil and transmitting the rotational force of the motor to the anvil. A rotation transmission position fixing member that immobilizes movement from the rotation transmission position to the rotation non-transmission position; a fixing mechanism that functions the output shaft rotation fixing member and the rotation transmission position fixing member to perform the fixing; It is preferable to provide.

  An output shaft rotation fixing member that fixes the output shaft of the motor in a non-rotatable manner; a rotation transmission position fixing member that immobilizes the movement of the hammer from a rotation transmission position to a rotation non-transmission position; the output shaft rotation fixing member; And a fixing mechanism for causing the rotation transmission position fixing member to function and fixing each of the rotation transmitting position fixing members. Thus, by fixing the two by the fixing mechanism, the tip tool attached to the anvil is fixed to the housing in a non-rotatable manner. be able to. For this reason, when the operator using the electric tool is not pulling the trigger switch and the power is not supplied to the motor, the housing is gripped and rotated manually, and the bolt, nut, So-called hand tightening can be performed to tighten the screw. Further, since the two fixings can be performed simultaneously by the fixing mechanism, the operator can be in a state where the operator can manually tighten with one action of operating the fixing mechanism.

  Further, the fixing mechanism performs two fixing operations of fixing the output shaft of the motor by the output shaft rotation fixing member and fixing the hammer to the rotation transmission position by the rotation transmission position fixing member substantially simultaneously. It is preferable. “Substantially simultaneous” means that the output shaft of the motor is fixed by the output shaft rotation fixing member and the hammer is fixed to the rotation transmission position by the rotation transmission position fixing member at substantially the same time. Even if designed, it means that the actual product includes the case where it is not exactly coaxial within the error.

  The fixing mechanism performs the two fixing operations of fixing the output shaft of the motor by the output shaft rotation fixing member and fixing the hammer to the rotation transmission position by the rotation transmission position fixing member at substantially the same time. With one action to operate, it can be in a state that can be surely hand-tightened.

  In addition, it is preferable that a trigger switch for starting rotational driving of the motor is provided, and the two fixings by the fixing mechanism are interlocked with the operation of the trigger switch.

  Since the two fixings by the fixing mechanism are linked to the operation of the trigger switch, it is possible to perform a manual tightening by only one action for the operator to operate the trigger switch.

  Moreover, it is preferable that the release of the two fixings by the fixing mechanism is interlocked with the operation of the trigger switch. Since the release of the two fixings by the fixing mechanism is linked to the operation of the trigger switch, the operator can return to the state in which the hand can be tightened from the state that can be manually tightened by only one action of operating the trigger switch. Can do.

  Further, it is preferable that the fixing mechanism functions when the trigger switch is in an OFF state. Since the fixing mechanism functions when the trigger switch is in the OFF state, the fixing mechanism always functions when the trigger switch is not operated. Therefore, the hand tightening operation can be performed in this state.

  Moreover, it is preferable to have a simultaneous fixing switch for performing the two fixings by the fixing mechanism. Since the simultaneous fixing switch for performing two fixings by the fixing mechanism is provided, it is possible to make a state where the operator can perform manual tightening with only one action of operating the simultaneous fixing switch.

  Further, the release of the two fixings by the fixing mechanism is preferably linked to the operation of the simultaneous fixing switch. Since the release of the two fixings by the fixing mechanism is linked to the operation of the simultaneous fixing switch, the operator can move from a state where it can be hand-tightened by only one action of operating the trigger switch to a state where it is operated by a motor. Can be restored.

  The rotation transmission position fixing member has a block member that can abut against the end of the hammer when the hammer is in the rotation transmission position, and the block member abuts against the end of the hammer. It is preferable that the hammer is temporarily fixed so as not to move.

  The rotation transmission position fixing member has a block member that can come into contact with the end of the hammer when the hammer is in the rotation transmission position, and the hammer is temporarily unable to move due to the contact of the block member with the end of the hammer. For this reason, the hammer can be temporarily fixed to be immovable with a simple configuration.

  Further, the output shaft rotation fixing member is provided with a rotation member fixed to the output shaft so as to be rotatable integrally with the output shaft, non-rotatable with respect to the housing, and movable in the axial direction of the output shaft. And a rotation fixing member engageable with the rotation member, and the rotation fixing member engages with the rotation member to fix the output shaft of the motor so as not to rotate.

  The output shaft rotation fixing member is a rotation member fixed to the output shaft so as to rotate integrally with the output shaft, and is non-rotatable with respect to the housing and is movable in the axial direction of the output shaft, and can be engaged with the rotation member A rotation fixing member, and the rotation fixing member engages with the rotation member to fix the output shaft of the motor in a non-rotatable manner. Therefore, the output shaft can be temporarily fixed in a non-rotatable manner with a simple configuration. it can.

  Further, it is preferable to have a brake circuit that stops rotation of the output shaft of the motor when the trigger switch is turned on and the motor rotates and then the trigger switch is turned off. .

  When the trigger switch is turned on, the motor rotates, and then when the trigger switch is turned off, it has a brake circuit that tries to stop the rotation of the output shaft of the motor, so the power supply to the motor is stopped After that, it is possible to prevent the tip tool from continuing to rotate unnecessarily.

  Further, the anvil is integrally formed, and the output shaft of the motor is fixed by the output shaft rotation fixing member, and the hammer is fixed to the rotation transmission position by the rotation transmission position fixing member. On the other hand, it is preferable to temporarily restrict the rotation of the anvil.

  The anvil is integrated, and the rotation of the anvil is temporarily restricted with respect to the housing by fixing the output shaft of the motor by the output shaft rotation fixing member and fixing the hammer to the rotation transmission position by the rotation transmission position fixing member. Therefore, it is not necessary to divide the anvil, and an electric tool using an anvil similar to the anvil that has been conventionally used can be obtained.

  According to the electric tool of the present invention, it is possible to provide an electric tool that can tighten bolts, nuts, and screws by hand tightening when the motor is not driven.

Sectional drawing which shows the electric tool which concerns on embodiment of this invention. Sectional drawing along II-II of FIG. The principal part sectional drawing which shows the state in which the rod of the electric tool which concerns on embodiment of this invention is located most forward. The principal part sectional view showing the state where the rod of the electric power tool concerning an embodiment of the invention is located most back. Sectional drawing along the VV line of FIG. Sectional drawing along the VI-VI line of FIG. The circuit diagram which shows the brake circuit of the electric tool by embodiment of this invention. Sectional drawing which shows the 1st modification of the electric tool by embodiment of this invention. It is sectional drawing which shows the state in which the simultaneous fixing switch of the 1st modification of the electric tool which concerns on embodiment of this invention exists in an initial position, (a) is sectional drawing along aa of FIG. b) is a sectional view taken along line bb of FIG. It is sectional drawing which shows the state by which the simultaneous fixing switch of the 1st modification of the electric tool which concerns on embodiment of this invention was rotated right, (a) is sectional drawing along aa of FIG. , (B) is sectional drawing along bb of FIG. It is sectional drawing which shows the state by which the simultaneous fixed switch of the 1st modification of the electric tool which concerns on embodiment of this invention was rotated left, (a) is sectional drawing along the aa of FIG. , (B) is sectional drawing along bb of FIG.

  A power tool according to an embodiment of the present invention will be described with reference to FIGS. An impact driver 1 as an electric tool shown in FIG. 1 is a tool for fastening bolts, nuts, and screws with a tip tool such as a bit or a socket, and mainly includes a housing 2, a motor 3, a gear mechanism 4, and an impact. The mechanism 5 is configured to drive a rechargeable battery 6 as a power source.

  The housing 2 is a resin housing made of 6 nylon, and has a body part 2A in which the motor 3 and the like are accommodated, and a handle 2B connected to the body part so as to be rotatable with respect to the body part 2A. ing. An accommodation space is defined in the body portion 2A and the handle 2B. The body portion 2A and the handle 2B are each constituted by a substantially symmetrical divided housing that is divided into two by a plane extending in the up-down direction and the front-rear direction described later. The motor 3, the gear mechanism 4, and the impact mechanism 5 are coaxially arranged from one end side to the other end side at a location corresponding to the body portion 2 </ b> A in the accommodation space. In the axial direction in which the motor 3, the gear mechanism 4, and the impact mechanism 5 are arranged, the motor 3 side is defined as the rear side, and the impact mechanism 5 side is defined as the front side, which is defined as the front-rear direction. Also, the vertical direction is defined with the downward direction in FIG. 1 as the downward direction and the opposite direction as the upward direction. Also, the right and left direction is defined with the direction from the back side to the front side of the page being the right direction and the opposite direction being the left direction.

  The body portion 2A is configured in a substantially cylindrical shape so as to follow the outer shape of the motor 3. In the body portion 2A, the front and rear positions of the motor 3 and the left and right side surfaces of the body portion 2A are not shown in the drawing. An exhaust port (not shown) is formed.

  As shown in FIG. 1, a terminal portion 24 to which the battery 6 is attached and electrically connected is disposed inside the handle 2B. A trigger 26A that is operated by an operator is provided at the rear of the trunk. The trigger 26A is urged forward by a spring (not shown), and when no force is applied to the trigger 26A from the outside, the trigger 26A is positioned at the foremost position. A recess 26a is formed on the front surface of the trigger 26A, and the operator can slide the trigger 26A backward by placing a fingertip on the recess 26a. The trigger 26A corresponds to a trigger switch.

  Further, a forward / reverse switching lever 27 for switching the rotation direction of the motor 3 is provided at a part of the body portion and above the trigger 26A. Further, a control circuit unit that controls the rotation of the motor 3 and a switch that is connected to the trigger 26A and the control circuit unit and controls conduction to the motor 3 are part of the body unit and above the forward / reverse switching lever 27. A control switch unit 100 having a unit is arranged.

  An LED light (not shown) that is connected to the control circuit unit and irradiates the front side is provided at the front end of the housing 2 and below the impact mechanism 5. In the housing 2, a cooling passage (not shown) is formed around the motor 3 and extends from an inlet (not shown) to an exhaust outlet (not shown).

  The motor 3 mainly includes a stator 31 and a rotor 32. The stator 31 is formed in a cylindrical shape, forms an outer shell of the motor 3, and an outer peripheral surface is held by the housing 2. The rotor 32 is rotatably arranged in the stator 31, and a rotor shaft 32 </ b> A extending in the front-rear direction is provided at the rotation axis position so as to rotate coaxially and integrally. The rotor shaft 32A corresponds to an output shaft.

  The motor 3 is connected to a brake circuit as shown in FIG. When electric power is being supplied to the motor 3 (the trigger 26A is in an ON state), the switch SW1 interlocked with the trigger 26A is switched to the motor circuit side SW1-2, and current flows in the direction indicated by the arrow B in FIG. The motor 3 rotates by flowing. On the other hand, when power is not supplied to the motor 3 (when the trigger 26A is switched from the on state to the off state), the switch SW1 is switched to the brake circuit side SW1-1, as indicated by an arrow A. Since the brake current flows through the brake circuit, the brake circuit operates so as to stop the rotation of the rotor shaft 32A.

  At the front end of the rotor shaft 32A, a fan (not shown) that is a centrifugal fan, a pinion gear 32C, and a rotating member 32F are mounted so as to rotate coaxially and with a bearing 32D. The rotor shaft 32A is described later. Is supported by the frame 4A. As shown in FIG. 2, the rotating member 32F has a substantially circular shape, and is provided with convex portions 32G that form four substantially rectangular shapes symmetrical to the rotor shaft 32A and project outward. The rotating member 32F is arranged in a coaxial positional relationship with the rotor shaft 32A. The rotating member 32F is fixed to the rotor shaft 32A by press fitting or the like.

  Further, the rotation member 32F is configured to be engageable with the rotation fixing member 4C. A part of the rotation fixing member 4C is engaged with a guide (not shown) that extends in the front-rear direction, is guided by the guide (not shown), is slidable in the front-rear direction, and is relative to the body portion 2A. It is impossible to rotate. As shown in FIG. 2, the rotation fixing member 4C has a substantially annular shape, and the inner peripheral surface thereof is similar to the outer periphery shape of the rotation member 32F, and has four substantially rectangular shapes symmetrical to the rotor shaft 32A. A recess 4a is formed. As the rotation fixing member 4C moves forward, the positions of the rotation member 32F and the rotation fixing member 4C in the front-rear direction coincide. Then, the four convex portions 32G of the rotating member 32F are respectively engaged with the four concave portions 4a of the rotating and fixing member 4C, and the rotating member 32F is temporarily fixed to be unrotatable by the rotating and fixing member 4C. The rotation member 32F and the rotation fixing member 4C correspond to an output shaft rotation fixing member. The convex portion 32G (rotor shaft 32A) may be automatically rotated to the position shown in FIG. 2 when the trigger 26A is turned off so that the convex portion 32G and the concave portion 4a are aligned. The convex part 32G may be rotated by

  A bearing 32E is attached to the rear end of the rotor shaft 32A, and the rotor shaft 32A is supported by the body portion 2A. The rotor shaft 32A is rotatably supported by these bearings 32D and 32E. When a fan (not shown) rotates integrally with the rotor shaft 32A, an air flow is formed that passes from a suction port (not shown) through a cooling passage (not shown) in the housing space in the body portion 2A to an exhaust port (not shown). .

  The gear mechanism 4 is disposed on the front side of the motor 3 in the body portion 2A. The gear mechanism 4 is a planetary gear mechanism in which the pinion gear 32C is a sun gear, and is mounted on the housing 2 with the frame body 4A as an outer shell. The gear mechanism 4 includes a spindle 41, a ring gear 42, and a plurality of planetary gears 43. ing. The spindle 41 is a planetary carrier that supports a plurality of planetary gears 43, and supports an anvil 52 described later at the front end thereof so as to be coaxially rotatable, and is supported at the rear end thereof so as to be rotatable via a bearing 4B. . In the vicinity of the rear end of the spindle 41, a flange 41A for supporting the planetary gear 43 and receiving a first spring 54A described later is provided. The spindle 41 is provided with a later-described hammer 53 that is movable in the front-rear direction, and is formed with a pair of grooves 41a, 41a that extend obliquely with respect to the axial direction. Balls 41B and 41B are inserted and connected to the hammer 53 by the balls 41B and 41B.

  The ring gear 42 is disposed on the outer periphery of the spindle 41 and is fixed to the frame 4A so as not to rotate. The plurality of planetary gears 43 are supported on the spindle 41 so as to be rotatable with respect to the spindle 41, and mesh with the ring gear 42 and mesh with the pinion gear 32C. With the above configuration, the rotation of the pinion gear 32 </ b> C is decelerated to one-eighth and transmitted to the spindle 41.

  The impact mechanism 5 mainly includes a hammer case 51, an anvil 52, a hammer 53, and a first spring 54A. The hammer case 51 has a cylindrical shape with a narrowed front end, is coaxially connected to the body portion 2A of the housing 2 at the rear end portion, and is coaxially connected to the motor 3, and a bearing 51A that rotatably supports the anvil 52 at the front end portion. have.

  The anvil 52 is formed in a columnar shape extending in the front-rear direction, and is rotatably supported by the hammer case 51 by a bearing 51A. 41 is rotatably supported. At the front end portion of the anvil 52, a tip tool mounting portion 52A to which a tip tool (not shown) is mounted is provided.

  The tip tool mounting portion 52A includes a plurality of balls 52C that can project into a mounting hole 52b formed at the front end of the anvil 52, and are biased rearwardly by a spring and balls 52C in a state of being biased rearward. It is mainly composed of an operation portion 52D that comes into contact with and protrudes the ball 52C into the mounting hole 52b. Further, at the rear end of the anvil 52, blade portions 52E and 52E which are a pair of engaged portions respectively extending in the radial direction and in the opposite directions are integrally provided.

  The hammer 53 is formed in a cylindrical shape in which a through hole 53 a that is mounted on the spindle 41 is formed. The front end of the hammer 53 is provided with claw portions 53A and 53A which are a pair of engaging portions and can be engaged with the blade portions 52E and 52E, respectively. The claw portions 53A and 53A protrude from the front end of the hammer 53 to the front side, are disposed at positions 180 degrees apart around the axis, and are formed in a symmetrical shape around the axis.

  The side portions of the claw portions 53A and 53A that intersect the circumferential direction are configured obliquely so that the claw portion 53A is tapered. Therefore, when a load is applied to the hammer 53 with respect to the anvil 52, the anvil 52 moves to the front side relative to the hammer 53 along this side surface, so that the blade portions 52E, 52E are claw portions 53A. 53A, the hammer 53 can rotate relative to the anvil 52. During actual work, the anvil 52 cannot move forward relative to the housing 2, so that the hammer 53 moves backward with respect to the anvil 52, so that the claw portions 53 </ b> A and 53 </ b> A have the blade portions 52 </ b> E. , 52E can be overcome and the hammer 53 can rotate relative to the anvil 52. The position of the hammer 53 when the hammer 53 is the frontmost corresponds to the rotation transmission position, and the position of the hammer 53 when the hammer 53 is the rearmost corresponds to the rotation non-transmission position. The rotation transmission position is not limited to when the hammer 53 is in the foremost position, but indicates a position (engagement position) where the claw portions 53A and 53A of the hammer 53 are engaged with the blade portions 52E and 52E. The rotation non-transmission position is not limited to the position where the hammer 53 is at the rearmost position, and indicates a position where the claws 53A and 53A of the hammer 53 are not engaged with the blades 52E and 52E (non-engagement position).

  A block member 55 is provided behind the hammer 53 in the front-rear direction and in front of the gear mechanism 4. As shown in FIG. 4, the block member 55 has a substantially triangular side cross-sectional shape, and the length of the block member 55 in the front-rear direction is from the rear end of the hammer 53 when the hammer 53 is in the rotation transmission position. It is slightly shorter than the distance to the flange 41A of the spindle 41. The length of the block member 55 in the left-right direction is about 10 mm. Moreover, the cross-sectional shape cut | disconnected by the surface orthogonal to the front-back direction has comprised the shape which makes substantially cyclic | annular form, as shown in FIG. 6, and a center angle is about 20 degrees-30 degrees. The block member 55 is movable in the vertical direction.

  The lower surface of the block member 55 is composed of a slope that goes downward as it goes forward. A guided recess 55 a is formed on the lower surface of the block member 55. As shown in FIG. 5, the guided recess 55 a extends upward from the lower surface of the block member 55 to a predetermined position, and extends parallel to the lower surface of the block member 55 therefrom. The guided recessed portion 55 a having this cross-sectional shape extends in the front-rear direction on the lower surface of the block member 55. The block member 55 corresponds to a rotation transmission position fixing member. Further, the rotation member 32F, the rotation fixing member 4C, and the block member 55 correspond to the restriction member. This restricting member is disposed in a drive path from the motor 3 to the hammer 53, and engages with a member located in the path, in this embodiment, the output shaft 32A (rotating member 32F) of the motor 3 and the hammer 53. ing. By retreating the hammer 53 and restricting the rotation of the motor 3, the rotation of the hammer 53 is also restricted.

  The tip of the rod 28 faces the block member 55. The tip of the rod 28 has an upper surface parallel to the lower surface of the block member 55, and a guide convex portion 28A having a similar shape slightly smaller than the guided concave portion 55a is provided on the upper surface. The guide convex portion 28 a having this cross-sectional shape is formed to extend in the front-rear direction on the upper surface of the tip portion of the rod 28, and is always engaged with the guided concave portion 55 a of the block member 55.

  The rod 28 is formed to extend in the front-rear direction so as to be movable in the front-rear direction, and the rear end portion is connected to the trigger 26A so as to be movable integrally. Therefore, when the operator who uses the impact driver 1 pulls the trigger 26A backward, the rod 28 moves backward. A rotation fixing member 4C is fixed to an intermediate portion of the rod 28, and the rod 28 and the rotation fixing member 4C are integrally movable in the front-rear direction. The rod 28 corresponds to a fixing mechanism.

  In the hammer 53, grooves 53b and 53b extending in the front-rear direction in which the pair of balls 41B and 41B are engaged are formed on the inner surface of the through hole 53a. When the balls 41B and 41B are engaged with the grooves 53b and 53b and the grooves 41a and 41a, respectively, the hammer 53 can rotate coaxially and integrally with the spindle 41. On the rear end side of the hammer 53, a receiving portion 53c that receives the first spring 54A is formed in series around a wall that defines the through hole 53a.

  The first spring 54A is carried on the flange 41A of the spindle 41 via a washer. A front end portion of the spindle 41 from the flange portion 41A extends forward in parallel with the first spring 54A. The first spring 54A is inserted into the receiving portion 53c and biases the hammer 53 against the spindle 41 in the axial direction and the front side direction. Therefore, the urging direction of the first spring 54A coincides with the axial direction and the front side direction. When the first spring 54A biases the hammer 53 forward, the claw portions 53A and 53A of the hammer 53 can be engaged with the blade portions 52E and 52E of the anvil 52.

  Also, when the hammer 53 moves backward with respect to the anvil 52 under the load described above, the blades 52E and 52E get over the claw portions 53A and 53A, and at the same time, the first spring 54A causes the hammer 53 to be on the front side. The claw portions 53A, 53A and the blade portions 52E, 52E come into contact with each other. As described above, the hammer 53 rotates with respect to the anvil 52, and the claw portions 53A and 53A come into contact with the blade portions 52E and 52E, whereby a striking force in the rotation direction is applied to the anvil 52.

  When the trigger 26A is pulled by the operator, the rod 28 is located at the rearmost position, and thus the rotation fixing member 4C is located at the rear. At this time, the rotation fixing member 4C is in a state of being disengaged from the rotation member 32F, and the block member 55 is positioned below and the flange 41A of the spindle 41 and the rear end of the hammer 53 It is in a position (Fig. 4) that is out of the space. For this reason, the rotor shaft 32A is in a rotatable state, and rotates when electric power is supplied to the motor 3. Further, the hammer 53 can move backward with respect to the anvil 52. When a heavy load is applied to the anvil 52, the claw portions 53A and 53A get over the blade portions 52E and 52E, and the urging force of the spring 54A and the hammer 53 The claw portions 53A and 53A can hit the blade portions 52E and 52E by the rotational force to rotate the anvil 52.

  When the operator releases the trigger 26A and the trigger 26A is not pulled, the rod 28 is located at the foremost position, and thus the rotation fixing member 4C is located at the foremost position. Then, the rotation fixing member 4C engages with the rotation member 32F (FIG. 1), and the block member 55 is located at the uppermost position and enters between the flange 41A of the spindle 41 and the rear end of the hammer 53 ( FIG. 3). For this reason, the rotor shaft 32A is temporarily unable to rotate. Further, the block member 55 comes into contact with the rear end of the hammer 53, the hammer 53 cannot move backward with respect to the anvil 52, the claw portions 53A, 53A cannot get over the blade portions 52E, 52E, and temporarily against the anvil 52. Thus, the backward movement and rotation of the hammer 53 are restricted. As a result, the rotation of the anvil 52 and the tip tool with respect to the housing 2 is restricted, so that bolts, nuts, and screws can be tightened by so-called hand tightening.

  Further, by operating the trigger 26A, the rod 28 can be moved to move the block member 55 and the rotation fixing member 4C at the same time. As a result, the rotation member 32F can be fixed, the hammer can be prevented from retreating, and the rotor shaft can be fixed at the same time, so that the operator can perform manual tightening with one action of operating the trigger 26A. .

  In addition, since the rod 28 can be moved by pulling the trigger 26A, it is possible to achieve a state in which the operator can perform manual tightening with only one action of operating the trigger 26A.

  Further, since the block member 55 that can come into contact with the end portion of the hammer 53 when the hammer 53 is in the rotation transmission position is provided, a simple configuration can be realized by the contact of the block member 55 with the end portion of the hammer 53. Thus, the hammer 53 can be temporarily fixed to be immovable.

  The output shaft rotation fixing member is provided so as to be rotatable with respect to the rotor shaft 32A so as to rotate integrally with the rotor shaft 32A, and to be unable to rotate with respect to the housing 2 and movable in the axial direction of the rotor shaft 32A. Since the rotation fixing member 4C engages with the rotation member 32F, the rotation fixing member 4C engages with the rotation member 32F, so that the rotor shaft 32A of the motor 3 cannot be rotated with a simple configuration. Can be fixed.

  In addition, when electric power is not supplied to the motor 3 (when the trigger 26A is turned off), the motor 3 has a brake circuit for stopping the rotation of the rotor shaft 32A. After the supply is stopped, the tip tool can be prevented from continuing to rotate unnecessarily. Furthermore, since the motor 3 is stopped immediately when the trigger 26A is turned off, the output shaft rotation fixing means can be made to function immediately and can be brought into a handtight state.

  Further, the anvil 52 is integrally formed, and is fixed to the housing 2 by fixing the rotor shaft 32A of the motor 3 by the output shaft rotation fixing member and fixing the hammer 53 to the rotation transmission position by the rotation transmission position fixing member. Since the rotation of the anvil 52 is temporarily restricted, the anvil 52 is not required to be divided, and an electric tool using the anvil 52 similar to the anvil that has been conventionally used can be obtained.

  The power tool according to the present invention is not limited to the above-described embodiment, and various improvements and modifications can be made within the scope described in the claims. For example, in the present embodiment, the rod 28 is moved in the front-rear direction to fix the rotor shaft 32A to be temporarily unrotatable, and the block member 55 abuts against the anvil 52 with the rear end of the hammer 53. Although fixing the hammer 53 to be non-retractable and interlocking with the trigger 26A, it is not limited to this configuration. For example, as shown in FIG. 8, the movement of the rod 28 in the front-rear direction may be interlocked with the simultaneous fixing switch (rotary cylinder 127).

  Specifically, a rotary cylinder 127 is provided inside the housing 2 at a position behind the motor 3 so as to be rotatable with respect to the body portion 2A of the housing 2, and extends in the diametrical direction inside thereof. A rib 127A (FIG. 9A, etc.) is provided. A cylindrical convex portion 127C that protrudes outward from the rotary cylinder 127 is provided extending in the front-rear direction at a position that is a part of the outer peripheral surface of the rotary cylinder 127 and that corresponds to the position where the rib 127A is provided. . The cylindrical convex portion 127 </ b> C passes through the convex portion exposing through hole 2 a that penetrates the inside and the outside of the housing 2, and is exposed to the outside of the housing 2.

  A rotation shaft 127D is provided at the central position of the rib 127A so as to coincide with the axial center position of the rotating cylinder 127, and the rotation shaft 127D rotates with respect to the body portion 2A of the housing 2 via a bearing (not shown). It is supported as possible. One end of a wire 128 (FIG. 8) is connected to the lower portion of the rotating cylinder 127, and the wire 128 is hung on a support column 129, extends forward, and is connected to the rear end of the rod 28. Further, the tip of the rod 28 is connected to one end of the spring 130, and the other end of the spring 130 is hooked on a locking portion extending from the housing 2 and fixed to the housing 2. The rod 28 is biased forward by the biasing force of the spring 130.

  As shown in FIGS. 10 and 11, when the tube convex portion 127 </ b> C is rotated by the operator, the wire 128 is pulled by the amount of rotation, and the rod 28 moves backward. As a result, the rotation fixing member 4C is in a state of being disengaged from the rotation member 32F, and the block member 55 is positioned below and the flange 41A of the spindle 41 and the rear end of the hammer 53 It's out of the middle. For this reason, the rotor shaft 32 </ b> A is in a rotatable state, and the electric power is supplied to the motor 3 to rotate. Further, the hammer 53 can be retracted with respect to the anvil 52, and the claw portions 53A and 53A can get over the blade portions 52E and 52E and the hammer 53 can be retracted and rotated with respect to the anvil 52.

  When the rotary cylinder 127 is in an initial position where no force is applied from the outside, the urging force of the spring 128 causes the rod 28 to be positioned in the foremost position as shown in FIG. Located in. Then, the rotation fixing member 4 </ b> C engages with the rotation member 32 </ b> F, and the block member 55 is located at the uppermost position and enters between the flange 41 </ b> A of the spindle 41 and the rear end of the hammer 53. For this reason, the rotor shaft 32A is temporarily unable to rotate. Further, the block member 55 comes into contact with the rear end of the hammer 53, the hammer 53 cannot move backward with respect to the anvil 52, the claw portions 53A, 53A cannot get over the blade portions 52E, 52E, and temporarily against the anvil 52. Thus, the hammer 53 is regulated to move backward / rotate.

  Further, although the fixing mechanism is constituted by the rod 28, the fixing mechanism is not limited to the rod 28. The fixing of the output shaft of the motor by the output shaft rotation fixing member and the fixing of the hammer to the rotation transmission position by the rotation transmission position fixing member may be performed. Moreover, if it is the structure which can be carried out substantially simultaneously, a hand fastening operation | work can be performed quickly.

  In the present embodiment, the output shaft rotation fixing member is configured by the rotation member 32F and the rotation fixing member 4C, but is not limited to the rotation member 32F and the rotation fixing member 4C. Any configuration that can temporarily fix the rotor shaft 32A, which is an output shaft of the motor, to be non-rotatable may be used. Similarly, the rotation transmission position fixing member is configured by the block member 55, but is not limited to the block member 55. Any structure may be used as long as the movement of the hammer from the rotation transmission position to the rotation non-transmission position can be temporarily fixed.

In addition, if the configuration is such that the fixing of the output shaft of the motor by the output shaft rotation fixing member and the fixing of the hammer to the rotation transmission position by the rotation transmission position fixing member can be performed simultaneously, the fixing is released. It is not necessary to switch from the fixed state to the fixed state at the same time.

  The electric power tool of the present invention is not limited to the above-described impact driver, and can be widely used for an electric power tool that includes an anvil and a hammer and can apply a rotational force and a striking force in the rotational direction.

1: Impact driver 2: Housing 3: Motor 4C: Rotation fixing member 26A: Trigger switch 28: Rod 32F: Rotation member 55: Block member

Claims (14)

A housing;
A motor having an output shaft and housed in the housing;
An anvil which is rotatably supported relative to the housing and to which a tip tool is connected;
A hammer disposed substantially coaxially with the anvil, rotatably supported with respect to the housing, and movable in a substantially axial direction of the output shaft;
A power tool comprising: a restricting member that restricts rotation and retraction of the hammer by engaging with a drive path from the motor to the hammer. A trigger switch for starting the rotational drive of the motor;
2. The electric power tool according to claim 1, wherein the regulation / regulation cancellation of the rotation and retraction of the hammer by the regulation member is interlocked with the operation of the trigger switch.   3. The electric tool according to claim 2, wherein when the trigger switch is turned on from the off state, the restriction of the hammer by the restriction member is released. The hammer is supported by the housing so as to be movable between a rotation transmission position and a rotation non-transmission position in the axial direction of the output shaft, rotates by the rotational force of the motor, and is in the rotation transmission position. It is configured to be able to rotate integrally with the anvil and transmit the rotational force of the motor to the anvil.
The regulating member is an output shaft rotation fixing member that fixes the output shaft of the motor so as not to rotate;
A rotation transmission position fixing member that immobilizes movement of the hammer from the rotation transmission position to the rotation non-transmission position;
The power tool according to claim 1, further comprising: a fixing mechanism that causes the output shaft rotation fixing member and the rotation transmission position fixing member to function to fix each of the output shaft rotation fixing member and the rotation transmission position fixing member.   The fixing mechanism performs two fixing operations of fixing the output shaft of the motor by the output shaft rotation fixing member and fixing the hammer to the rotation transmission position by the rotation transmission position fixing member substantially simultaneously. The power tool according to claim 4, wherein A trigger switch for starting the rotational drive of the motor;
The electric tool according to claim 4 or 5, wherein the two fixings by the fixing mechanism are interlocked with the operation of the trigger switch.   The electric tool according to claim 6, wherein the release of the two fixings by the fixing mechanism is interlocked with the operation of the trigger switch.   The power tool according to claim 6, wherein the fixing mechanism functions when the trigger switch is in an OFF state.   The electric tool according to claim 4 or 5, further comprising a simultaneous fixing switch for performing the two fixing by the fixing mechanism.   10. The electric tool according to claim 9, wherein the release of the two fixings by the fixing mechanism is interlocked with the operation of the simultaneous fixing switch.   The rotation transmission position fixing member has a block member that can come into contact with the end of the hammer when the hammer is in the rotation transmission position, and the rotation of the block member against the end of the hammer The power tool according to any one of claims 4 to 10, wherein the hammer is temporarily fixed to be immovable.   The output shaft rotation fixing member is provided with a rotation member fixed to the output shaft so as to be able to rotate integrally with the output shaft, non-rotatable with respect to the housing, and movable in the axial direction of the output shaft. A rotation fixing member engageable with the rotation member, and the rotation fixing member engages with the rotation member to fix the output shaft of the motor so as not to rotate. Item 15. The electric tool according to any one of Items 10.   The motor rotates when the trigger switch is turned on, and then has a brake circuit for stopping the rotation of the output shaft of the motor when the trigger switch is turned off. The power tool according to any one of claims 2, 3, 6, 7, 8, 11, and 12. The anvil is composed of one piece,
The rotation of the anvil is temporarily restricted with respect to the housing by fixing the output shaft of the motor by the output shaft rotation fixing member and fixing the hammer to the rotation transmission position by the rotation transmission position fixing member. The power tool according to any one of claims 4 to 13, wherein the power tool is performed.

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