Rotary impact tool

Abstract

To provide a technique that can suppress damage to an operation part for switching modes in a rotary striking tool.SOLUTION: A rotary striking tool 100 comprises: a motor 2; a driving mechanism 3; a tool main body 10 that stores the motor and the driving mechanism; a handle 17 having a gripping part 170; and a first operation member 6. The driving mechanism is configured to be operated selectively in a plurality of operation modes which include a first mode in which at least an operation of rotationally driving a tip tool 101 around a driving shaft A1 is performed by power of the motor and a second mode in which only an operation of driving the tip tool linearly along the driving shaft is performed. The gripping part which is extended in a direction crossing the driving shaft, and configured to be gripped by a user. The first operation member is configured to be able to switch the operation mode of the driving mechanism by being operated by the user. The first operation member is provided at a position opposing to the gripping part of the tool main body.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a rotary impact tool.

Background Art

[0002] There is known a rotary impact tool configured to operate according to a selected mode from a plurality of modes including a mode that performs only a striking operation for linearly driving a tip tool in a direction along a predetermined drive shaft and a mode that performs at least a rotational operation for rotationally driving the tip tool around the drive shaft. Patent Document 1 describes a hammer drill provided with a mode switching dial for switching an operation mode.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the hammer drill described in Patent Document 1, the mode switching dial is disposed at the upper end of a housing that houses a drive mechanism. However, in this hammer drill, for example, when the hammer drill drops with the upper end of the housing facing vertically downward, the mode switching dial may be damaged. Therefore, there has been a demand for a technique capable of suppressing damage to an operation unit for switching a mode in a rotary impact tool configured to operate according to a selected mode.

Means for Solving the Problems

[0005] The present disclosure can be realized in the following forms.

[0006] According to one embodiment of the present disclosure, a rotary impact tool is provided. The rotary impact tool includes a motor, a drive mechanism, a tool body, a handle, and a first operation member. The drive mechanism is configured to be selectively operable in a plurality of operation modes including a first mode in which the tip tool is rotationally driven around the drive shaft by the power of the motor and a second mode in which only the operation of linearly driving the tip tool along the drive shaft is performed. The tool body is configured to accommodate the motor and the drive mechanism. The handle has a gripping portion that extends in a direction intersecting the drive shaft and is gripped by a user. The first operation member is configured to be operable by the user to switch the operation mode of the drive mechanism. The first operation member is provided at a position of the tool body facing the gripping portion.

[0007] According to this embodiment, since the first operation member for switching the mode of the drive mechanism is provided at a position of the tool body facing the gripping portion, for example, even if the rotary impact tool collides with a wall, the ground, etc., the first operation member does not collide with the wall, the ground, etc. Therefore, it is possible to suppress damage to the first operation member due to an external impact being applied to the rotary impact tool.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

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DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, representative and non-limiting specific examples of the present disclosure will be described in detail with reference to the drawings. This detailed description is merely intended to show those skilled in the art the details for implementing preferred examples of the present disclosure, and is not intended to limit the scope of the present disclosure. Also, the additional features and disclosures disclosed below can be used separately or together with other features and disclosures to provide a further improved rotary impact tool, its control method, and usage method.

[0010] Also, the combinations of features and steps disclosed in the following detailed description are not essential for carrying out the present disclosure in the broadest sense, and are described only for the purpose of explaining representative specific examples of the present disclosure in particular. Further, the various features of the above and below representative specific examples, as well as the various features described in the independent and dependent claims, do not have to be combined as described in the specific examples herein or in the order listed, in providing additional and useful embodiments of the present disclosure.

[0011] All features described in this specification and / or the claims are intended to be disclosed separately and independently of each other, as limitations on the initial disclosure and the claimed specific matters, apart from the configuration of the features described in the embodiments and / or claims. Further, all descriptions regarding numerical ranges and groups or populations are made with the intention of disclosing intermediate configurations as limitations on the initial disclosure and the claimed specific matters.

[0012] In one or more embodiments, the gripping portion may include a second operating member. The second operating member may be normally maintained in an off position and configured to move to an on position by being pressed by the user to drive the motor. The first operating member may be provided at a position facing the second operating member.

[0013] According to the above configuration, since the first operating member is provided at a position facing the second operating member for driving the motor in the tool body, the operations of the first operating member and the second operating member can be performed with one hand. Therefore, the operability of the rotary impact tool can be improved.

[0014] In one or more embodiments, the first operating member may be configured to be slidable within a predetermined range in a direction intersecting the drive shaft. Further, the first operating member may be configured to switch the operation mode of the drive mechanism to the first mode as it is moved to a first position within the predetermined range. Further, the first operating member may be configured to switch the operation mode of the drive mechanism to the second mode as it is moved to a second position different from the first position within the predetermined range.

[0015] According to the above configuration, the operation mode of the drive mechanism can be switched between the first mode and the second mode by operating the first operating member.

[0016] In one or more embodiments, the rotary impact tool may further include a tool holder and a clutch member. The tool holder may be configured to removably hold the tip tool and to be rotationally driven around the drive shaft by the torque transmitted from the motor. The clutch member may be provided on the tool holder and configured to be movable along the drive shaft in response to an operation of the first operating member. The clutch member may be configured to transmit the torque by being disposed at a third position in the direction along the drive shaft. Further, the clutch member may be configured to block the transmission of the torque by being disposed at a fourth position different from the third position in the direction along the drive shaft. The drive mechanism may be configured to operate in the first mode when the clutch member is disposed at the third position. Further, the drive mechanism may be configured to operate in the second mode when the clutch member is disposed at the fourth position.

[0017] According to the above configuration, the operation mode of the drive mechanism can be switched between the first mode and the second mode by moving the clutch member between a third position and a fourth position in the direction along the drive shaft.

[0018] In one or more embodiments, the rotary impact tool may include a transmission mechanism. The transmission mechanism may be configured to transmit the sliding of the first operating member within the predetermined range to the clutch member, so as to move the clutch member along the drive shaft.

[0019] According to the above configuration, the sliding of the first operating member provided at a position facing the gripping portion of the tool body can be transmitted to the clutch member on the tool holder that is rotationally driven around the drive shaft.

[0020] In one or more embodiments, the transmission mechanism may include a conversion mechanism. The conversion mechanism may be configured to convert the linear sliding of the first operating member within the predetermined range into a rotational motion. The conversion mechanism may further be configured to convert the rotational motion into a linear motion along the drive shaft.

[0021] According to the above configuration, by converting the linear sliding of the first operating member into a rotational motion and then converting the rotational motion into a linear motion along the drive shaft, the clutch member can be moved along the drive shaft. Also, compared with a configuration without a conversion mechanism, the degree of freedom in arranging the transmission mechanism can be improved.

[0022] In one or more embodiments, the conversion mechanism may include a first rack gear, a first pinion gear, a second pinion gear, and a second rack gear. The first rack gear may be configured to slide in response to the linear sliding of the first operating member within the predetermined range. The first pinion gear may be configured to engage with the first rack gear. The second pinion gear may be configured to rotate in response to the rotation of the first pinion gear. The second rack gear may be configured to engage with the second pinion gear and convert the rotational motion of the first pinion gear and the second pinion gear into the linear motion along the drive shaft.

[0023] According to the above configuration, by using the first rack gear, the first pinion gear, the second pinion gear, and the second rack gear, the linear sliding of the first operating member can be converted into a linear motion and transmitted to the clutch member.

[0024] In one or more embodiments, the rotary impact tool may include a biasing member that biases the first operating member. The first operating member may be configured to be held at the first position and the second position by the biasing force of the biasing member.

[0025] According to the above configuration, it is possible to provide a rotary impact tool that can easily position the first operating member at the first position or the second position while sliding the first operating member within a predetermined range.

[0026] In one or more embodiments, the gripping portion may include a second operating member that is normally maintained in an off position and moves to an on position when pressed by the user to drive the motor. The rotary impact tool may further include a locking member and a lock control member. The locking member may be configured to be movable by the user's operation between a lockable position where the second operating member can be locked in the on position and a non-lockable position where the second operating member cannot be locked in the on position. The lock control member may be configured to be movable along the drive shaft. The lock control member may be arranged at a position that interferes with the locking member in the first mode and configured to hold the locking member in the non-lockable position according to the operation of the first operating member. Further, the lock control member may be arranged at a position that does not interfere with the locking member in the second mode according to the operation of the first operating member and configured to allow the locking member to move to the lockable position.

[0027] According to the above configuration, when the tip tool is in the second mode where it only performs a striking operation, the lock control member is configured to allow the lock member to move to the lockable position. Therefore, in a machining operation where the striking operation is continuously performed for a relatively long time, the user does not have to continuously press the second operation member. As a result, the burden on the user in the machining operation can be reduced. Further, when the tip tool is in the first mode where it performs a rotational operation, the lock control member holds the lock member in the non-lockable position. Therefore, for example, even if the tip tool is locked to the workpiece, the user can stop the drive of the motor simply by releasing the pressure on the second operation member. As a result, a highly safe rotary impact tool can be provided.

[0028] In one or more embodiments, the rotary impact tool may include a mode detection unit, a rotation detection unit, and a control unit. The mode detection unit may be configured to detect that the operation mode of the drive mechanism is at least the first mode. The rotation detection unit may be configured to detect the rotation state of the tool body around the drive shaft. The control unit may be configured to be able to control the drive of the motor. The control unit may be configured to stop the motor when the operation mode is the first mode and the state of the tool body is a state of excessive rotation around the drive shaft based on the detection results of the rotation detection unit and the mode detection unit.

[0029] According to the above configuration, when the tip tool is in the first mode where it performs a rotational operation, for example, even if a phenomenon (also referred to as a kickback phenomenon) occurs where the tip tool is locked to the workpiece and the tool body rotates excessively around the drive shaft, the controller stops the motor based on the detection value of the rotation detection unit. Therefore, the safety of the rotary impact tool can be further enhanced.

[0030] In one or more embodiments, the rotary impact tool may include an elastic member. The elastic member may connect the handle to the tool body so as to be relatively movable along the drive shaft. The rotation detection unit may be housed in the handle.

[0031] According to the above configuration, since the rotation detection unit is housed in the handle that is relatively movably connected to the tool body by the elastic member, the vibration of the tool body transmitted to the rotation detection unit can be reduced. Therefore, the rotation detection unit can have a longer service life.

[0032] <Embodiment> Hereinafter, with reference to FIGS. 1 to 15, a rotary impact tool according to an embodiment will be described. In the present embodiment, as an example of the rotary impact tool, a hammer drill 100 will be described. The hammer drill 100 is configured to be capable of performing an operation of rotationally driving a tip tool 101 mounted on a tool holder 30 around a predetermined drive shaft A1 (hereinafter referred to as a rotation operation), and an operation of linearly driving the tip tool 101 parallel to the drive shaft A1 (hereinafter referred to as a percussion operation).

[0033] First, with reference to FIG. 1, the overall configuration of the hammer drill 100 will be briefly described. As shown in FIG. 1, the hammer drill 100 includes a tool body 10 and a handle 17 connected to the tool body 10.

[0034] The tool body 10 includes a gear housing 12 extending along the drive shaft A1, and a motor housing 13 connected to one end portion of the gear housing 12 in the longitudinal axis direction and extending in a direction intersecting the drive shaft A1. In the present embodiment, the motor housing 13 extends in a direction substantially orthogonal to the drive shaft A1. With such a configuration, the tool body 10 is generally formed in an L shape as a whole.

[0035] Inside the other end portion of the gear housing 12 in the longitudinal axis direction, a tool holder 30 configured to be detachable from the tip tool 101 is disposed. Further, a drive mechanism 3 is housed in the gear housing 12. Although details will be described later, the drive mechanism 3 is configured to be selectively operable in a plurality of operation modes including a mode that performs a rotation operation and a striking operation (hereinafter, a rotation-striking mode) and a mode that performs only a striking operation (hereinafter, a striking mode). A motor 2 is housed in the motor housing 13. The motor 2 is disposed such that the rotation axis A2 of the motor shaft 25 intersects (more specifically, is orthogonal to) the drive shaft A1. The gear housing 12 and the motor housing 13 are connected so as not to be relatively movable.

[0036] The handle 17 includes a gripping portion 170 extending in a direction intersecting (more specifically, substantially orthogonal to) the drive shaft A1, and connecting portions 173 and 174 protruding in a direction intersecting (more specifically, substantially orthogonal to) the gripping portion 170 from both end portions of the gripping portion 170 in the longitudinal axis direction. The handle 17 is generally formed in a substantially C shape as a whole. The handle 17 is connected to an end portion on the side opposite to the side where the tool holder 30 is disposed in the longitudinal axis direction of the tool body 10. More specifically, the connecting portion 173 is connected to the gear housing 12, and the connecting portion 174 is connected to the motor housing 13.

[0037] Hereinafter, the detailed configuration of the hammer drill 100 will be described. In the following description, for convenience, the extending direction of the drive shaft A1 of the hammer drill 100 (the longitudinal axis direction of the gear housing 12) is defined as the front-rear direction of the hammer drill 100, the one end side where the tool holder 30 is provided is defined as the front side of the hammer drill 100, and the opposite side is defined as the rear side. Further, the extending direction of the gripping portion 170 is defined as the up-down direction of the hammer drill 100, the side where the connecting portion 173 and the gear housing 12 are connected is defined as the upper side, and the opposite side is defined as the lower side. Further, the direction orthogonal to the front-rear direction and the up-down direction is defined as the left-right direction.

[0038] First, the handle 17 will be described. As described above, the handle 17 includes a grip portion 170 extending in the vertical direction, a connecting portion 173 protruding forward from the upper end of the grip portion 170, and a connecting portion 174 protruding forward from the lower end of the grip portion 170. As shown in FIG. 1, elastic members 175 and 176 are respectively disposed between the connecting portion 173 and the rear upper end portion of the gear housing 12, and between the connecting portion 174 and the rear lower end portion of the motor housing 13. In the present embodiment, compression coil springs are employed as the elastic members 175 and 176. The handle 17 is connected to the tool body 10 via the elastic members 175 and 176 so as to be relatively movable in the front-rear direction. With such a configuration, vibrations transmitted from the tool body 10 to the handle 17 (particularly, vibrations in the front-rear direction caused by the striking operation) are reduced.

[0039] A switch lever 171 is provided on the grip portion 170. The switch lever 171 is disposed on the front side of the grip portion 170 and extends from a substantially middle position in the vertical direction of the grip portion 170 to the upper side. The switch lever 171 is configured to be operable by being pressed by the user. In FIG. 2, the off position of the switch lever 171 is shown by a solid line, and the on position is shown by a two-dot chain line. The switch lever 171 is constantly biased forward by a plunger of a main switch 172 provided behind the switch lever 171, and thus is held in the off position. When the user presses the switch lever 171, it is drawn into the grip portion 170 and moves to the rear on position. When the switch lever 171 moves to the on position, the main switch 172 housed in the handle 17 is turned on, and the motor 2 is driven under the control of a controller 9 described later.

[0040] A lock mechanism 8 is provided near the connecting portion 173 of the handle 17. The lock mechanism 8 is a mechanism configured to be able to lock the switch lever 171 in the on position when the operation mode is the striking mode, and to be unable to lock the switch lever 171 in the on position when the operation mode is the rotary striking mode. The lock mechanism 8 will be described later.

[0041] Inside the handle 17, an acceleration sensor 95 is housed. In the present embodiment, the acceleration sensor 95 is housed inside the lower end portion of the grip portion 170 and is disposed at a position relatively distant from the drive shaft A1. The acceleration sensor 95 is configured to be able to output a signal indicating the detected acceleration to a controller 9 described later. In the present embodiment, the acceleration detected by the acceleration sensor 95 is used as an index indicating the rotational state around the drive shaft A1 of the tool body 10.

[0042] Next, the internal structure of the motor housing 13 will be described. The motor housing 13 mainly houses a motor 2 and a controller 9.

[0043] As shown in FIG. 1, the motor 2 has a motor main body portion 20 including a stator 21 and a rotor 23, and a motor shaft 25 extending from the rotor 23. The rotation axis A2 of the motor 2 (motor shaft 25) extends in the vertical direction. In the present embodiment, as the motor 2, an alternating current motor that is driven by receiving power supply from an external power source via a power cord 19 is adopted. The motor shaft 25 is rotatably supported by bearings at the upper and lower ends. The upper end portion of the motor shaft 25 protrudes into the gear housing 12, and a drive gear 29 is formed at this portion.

[0044] The controller 9 is attached to the rear wall 132 of the motor main body portion 20. In the present embodiment, the controller 9 is composed of a microcomputer including a CPU and a memory, etc., and the CPU is configured to control the operation of the hammer drill 100.

[0045] The controller 9 is electrically connected to the main switch 172, the acceleration sensor 95, and a mode detection unit 90 (to be described later) via an electric wire (not shown). In the present embodiment, when the main switch 172 is turned on, the controller 9 drives the motor 2 according to the rotation speed set via an adjustment dial (not shown). Further, although details will be described later, the controller 9 is configured to stop the drive of the motor 2 when the tool body 10 rotates excessively around the drive shaft A1 using the detection results of the acceleration sensor 95 and the mode detection unit 90.

[0046] Next, the internal structure of the gear housing 12 will be described. The gear housing 12 mainly houses a tool holder 30, a drive mechanism 3, and a transmission mechanism 4.

[0047] The front portion of the gear housing 12 is generally formed in a cylindrical shape along the drive shaft A1, and the tool holder 30 is housed in this cylindrical portion (also referred to as the barrel portion). Although not shown, an auxiliary handle for assisting in gripping the hammer drill 100 can be attached to the barrel portion.

[0048] The drive mechanism 3 includes a motion conversion mechanism 31, a striking mechanism 33, and a rotation transmission mechanism 35. Most of the motion conversion mechanism 31 and the rotation transmission mechanism 35 are housed in the rear portion of the gear housing 12.

[0049] The motion conversion mechanism 31 is configured to convert the rotational motion of the motor 2 into a linear motion and transmit it to the striking mechanism 33. In this embodiment, a well-known crank mechanism is adopted as the motion conversion mechanism 31. As shown in FIG. 2, the motion conversion mechanism 31 includes a crankshaft 311, a connecting rod 313, and a piston 315. The crankshaft 311 is arranged parallel to the motor shaft 25 at the rear end of the gear housing 12. The crankshaft 311 has a driven gear 312 that meshes with the drive gear 29. One end of the connecting rod 313 is connected to an eccentric pin, and the other end is connected to the piston 315 via a connecting pin. The piston 315 is slidably arranged within a cylindrical cylinder 317. When the motor 2 is driven, the piston 315 reciprocates (in the front-rear direction) along the drive shaft A1 within the cylinder 317.

[0050] The striking mechanism 33 includes a striker 331 and an impact bolt 333 (see FIG. 1). The striker 331 is arranged slidably in the front-rear direction within the cylinder 317 on the front side of the piston 315. An air chamber 335 is formed between the striker 331 and the piston 315 to linearly move the striker 331 via the pressure fluctuation of the air generated by the reciprocating movement of the piston 315. The impact bolt 333 is configured as an intermediate member that transmits the kinetic energy of the striker 331 to the tip tool 101. As shown in FIG. 1, the impact bolt 333 is slidably arranged in the front-rear direction within a tool holder 30 arranged coaxially with the cylinder 317.

[0051] When the motor 2 is driven and the piston 315 moves forward, the air in the air chamber 335 is compressed and the internal pressure rises. The striker 331 is pushed forward at high speed by the action of the air spring and collides with the impact bolt 333, transmitting the kinetic energy to the tip tool 101. As a result, the tip tool 101 is linearly driven parallel to the drive shaft A1 to strike the workpiece. On the other hand, when the piston 315 moves backward, the air in the air chamber 335 expands and the internal pressure decreases, and the striker 331 is pulled backward. The hammer drill 100 performs a striking operation by repeating such an operation in the motion conversion mechanism 31 and the striking mechanism 33.

[0052] The rotation transmission mechanism 35 is configured to transmit the torque of the motor shaft 25 to the tool holder 30. As shown in FIG. 2, in the present embodiment, the rotation transmission mechanism 35 includes a drive gear 29 provided on the motor shaft 25, an intermediate shaft 36, and a clutch mechanism 54. The rotation transmission mechanism 35 is configured as a reduction gear mechanism, and the rotational speed sequentially decreases in the order of the motor shaft 25, the intermediate shaft 36, and the tool holder 30.

[0053] The intermediate shaft 36 is disposed parallel to the motor shaft 25 above the front side of the motor 2. A driven gear 362 that meshes with the drive gear 29 is provided at the lower portion of the intermediate shaft 36. A small bevel gear 361 is provided at the upper portion of the intermediate shaft 36.

[0054] The clutch mechanism 54 is mounted on the tool holder 30. The clutch mechanism 54 is configured to transmit torque from the motor shaft 25 to the tool holder 30 or to cut off the transmission of torque. In the present embodiment, the clutch mechanism 54 includes a gear sleeve 56 having a large bevel gear 561 and a driving sleeve 55. The gear sleeve 56 is rotatably supported around the drive shaft A1 around the rear end portion of the tool holder 30. The large bevel gear 561 meshes with the small bevel gear 361 at the upper end portion of the intermediate shaft 36.

[0055] The driving sleeve 55 is formed in a cylindrical shape and is spline-coupled to the outer periphery of the tool holder 30 in front of the gear sleeve 56. That is, the driving sleeve 55 is engaged with the tool holder 30 in a state where circumferential movement with respect to the tool holder 30 is restricted and movement in the front-rear direction is possible.

[0056] In FIGS. 2, 8, and 11, the rearmost position (hereinafter, position Pd) and the foremost position (hereinafter, position Ph) within the movement range of the driving sleeve 55 are shown. When the driving sleeve 55 is moved to the position Pd, it engages with the front end portion of the gear sleeve 56 (see FIG. 8). Thereby, the torque of the motor 2 can be transmitted to the tool holder 30 via the rotary transmission mechanism 35. As described above, since the motion conversion mechanism 31 is also driven when the motor 2 is driven, when the motor 2 is driven with the driving sleeve 55 disposed at the position Pd, in the hammer drill 100, the rotational operation and the impact operation are performed simultaneously. That is, when the driving sleeve 55 is moved to the position Pd, the operation mode of the hammer drill 100 switches to the rotary impact mode.

[0057] Also, when the driving sleeve 55 is moved forward from the position Pd, the engagement between the driving sleeve 55 and the gear sleeve 56 is released (see FIG. 11). Thereby, the torque of the motor 2 becomes a state where it cannot be transmitted to the tool holder 30 via the rotary transmission mechanism 35. Then, as shown in FIG. 2, when the driving sleeve 55 is moved to the position Ph, it engages with the lock ring 301 fixed to the gear housing 12, and the tool holder 30 becomes non-rotatable around the drive shaft A1. When the motor 2 is driven in this state, the motion conversion mechanism 31 is driven, and only the impact operation is performed in the hammer drill 100. That is, when the driving sleeve 55 is moved to the position Ph, the operation mode of the hammer drill 100 switches to the impact mode. Thus, in the hammer drill 100, the operation mode is switched by moving the driving sleeve 55 parallel to the drive shaft A1 (in the front-rear direction).

[0058] As shown in FIG. 11, when the driving sleeve 55 is moved between the position Ph and the position Pd, the torque of the motor 2 cannot be transmitted to the tool holder 30 as described above. Further, since the driving sleeve 55 is not engaged with the locking ring 301, the tool holder 30 is not fixed to the gear housing 12. Therefore, in this state, the user can rotate the tip tool 101 and the tool holder 30 around the drive shaft A1 by gripping the tip tool 101 with a finger and rotating it around the drive shaft A1. That is, the operation mode of the drive mechanism 3 switches to a mode in which the alignment of the tip tool 101 can be performed. This operation mode is also referred to as the "neutral mode".

[0059] Hereinafter, the configuration for switching the operation mode of the hammer drill 100 will be described. The hammer drill 100 includes a mode switching operation unit 6 operated by the user and a transmission mechanism 4 that transmits the operation of the mode switching operation unit 6 to the driving sleeve 55, and is configured to switch the operation mode by these.

[0060] As shown in FIGS. 1, 2, 8, and 11, the mode switching operation unit 6 is provided at a position of the tool body 10 facing the gripping portion 170. The mode switching operation unit 6 faces the switch lever 171 provided on the front side of the gripping portion 170. In the present embodiment, the mode switching operation unit 6 is supported by the gear housing 12 so as to be linearly movable in the left-right direction in a state where a part thereof is exposed from the opening 122 formed in the upper portion of the rear wall 121 of the gear housing 12. The mode switching operation unit 6 is also called a mode change lever.

[0061] The mode switching operation unit 6 includes a main operation unit 61 which is a part operated by the user, and a base unit 62 connected to the main operation unit 61. As shown in FIG. 3, the main operation unit 61 includes a rectangular plate portion 611 having a major axis in the left-right direction, and a lever 612 protruding rearward from the plate portion 611. The lever 612 is provided at the central portion of the plate portion 611 in the left-right direction and extends in the up-down direction. The mode switching operation unit 6 is movable between a position P1 on the left side from a position Pn when the lever 612 is disposed at the center in the left-right direction of the opening 122, and a position P2 on the right side from the position Pn. In FIG. 3, the state where the mode switching operation unit 6 is positioned at the position P2 is shown by a solid line, and the states where the mode switching operation unit 6 is positioned at the positions Pn and P1 are shown by a two-dot chain line. Although details will be described later, the user can switch the operation mode to the striking mode by operating the lever 612 to move the mode switching operation unit 6 to the position P2, and can switch the operation mode to the rotational striking mode by moving the mode switching operation unit 6 to the position P1. Further, the user can switch the operation mode to the neutral mode by operating the lever 612 to move the mode switching operation unit 6 to the position Pn.

[0062] The base 62 of the mode switching operation unit 6 is held by the gear housing 12 so as to be movable in the left - right direction. As shown in FIG. 4, leaf springs 125 held by the gear housing 12 are disposed above and below the base 62. The leaf spring 125 extends in the left - right direction in a cross - sectional view. The leaf spring 125 has a convex portion 126 that protrudes toward the base 62 at a position corresponding to the central portion of the opening 122 in the left - right direction. Concave portions 62p2, 62pn, 62p1 that are recessed downward and upward are formed at the upper end and the lower end of the base 62, respectively. The concave portions 62p2, 62pn, 62p1 are formed in this order from left to right and are each engageable with the convex portion 126 of the leaf spring 125. In FIG. 4, the convex portion 126 is engaged with the concave portion 62ph. The concave portions 62p2, 62pn, 62p1 are arranged at intervals in the left - right direction so as to position the mode switching operation unit 6 at positions P2, Pn, P1, respectively, when each is engaged with the convex portion 126. Thus, the mode switching operation unit 6 is held at positions P2, Pn, P1 by the biasing force of the leaf spring 125.

[0063] Next, the transmission mechanism 4 will be described. The transmission mechanism 4 is configured to transmit the operation of the mode switching operation unit 6 to the driving sleeve 55. As shown in FIG. 2, in the present embodiment, the transmission mechanism 4 includes a first conversion mechanism 40 and a connecting member 70 that connects the first conversion mechanism 40 and the driving sleeve 55. The first conversion mechanism 40 is configured to convert the linear sliding of the mode switching operation unit 6 (main operation unit 61) in the left - right direction into a linear motion in a direction parallel to the drive shaft A1 (front - rear direction). The connecting member 70 is arranged so as to be movable parallel to the drive shaft A1 and is configured to connect the first conversion mechanism 40 and the driving sleeve 55.

[0064] First, the first conversion mechanism 40 will be described. The first conversion mechanism 40 is configured as a rack and pinion mechanism. As shown in FIGS. 2, 8, and 11, the first conversion mechanism 40 includes a first rack gear 621, a first pinion gear 41, a first shaft 43, a second pinion gear 42, and a second rack gear 712. In the present embodiment, these members constituting the first conversion mechanism 40 are configured to move the connection member 70 to the rearmost position within the movement range when the mode switching operation unit 6 is moved to the position P1, and move the connection member 70 to the foremost position within the movement range when the mode switching operation unit 6 is moved to the position P2. Hereinafter, each member will be described.

[0065] The first rack gear 621 forms a part of the mode switching operation unit 6. As shown in FIG. 5, the first rack gear 621 is formed at the front portion of the base portion 62. The first rack gear 621 linearly moves in the left - right direction in response to the linear movement of the mode switching operation unit 6 (main operation unit 61) in the left - right direction.

[0066] The first pinion gear 41 meshes with the first rack gear 621 on the front side of the first rack gear 621. As shown in FIGS. 2, 8, and 11, the first shaft 43 extends in the vertical direction and is rotatably supported by the gear housing 12. The first pinion gear 41 is fixed to the lower part, and the second pinion gear 42 is fixed to the upper part. The central axis of the first shaft 43 is also the rotation axis (hereinafter, rotation axis A3) of the first pinion gear 41 and the second pinion gear 42. When the first rack gear 621 moves in the left - right direction, the first pinion gear 41 rotates around the rotation axis A3, rotating the first shaft 43. As a result, the second pinion gear 42 held at the upper part of the first shaft 43 rotates around the rotation axis A3.

[0067] The second rack gear 712 meshes with the second pinion gear 42 above the first shaft 43. As shown in FIGS. 2 and 6, the second rack gear 712 is provided on a first member 71 that extends in the front-rear direction above the first conversion mechanism 40. When the second pinion gear 42 rotates around the rotation axis A3, the first member 71 provided with the second rack gear 712 moves parallel to the drive shaft A1 (that is, in the front-rear direction). In this way, the left-right movement of the mode switching operation unit 6 is converted into a linear movement along the drive shaft A1 by the first conversion mechanism 40.

[0068] Next, the connecting member 70 will be described. As shown in FIGS. 2 and 6, the connecting member 70 includes a first member 71 on which the second rack gear 712 is formed, a second member 72, a third member 73, and an engaging arm 74 that engages with the driving sleeve 55. These members are arranged and connected in this order from the rear to the front, and are disposed in the gear housing 12 so as to be integrally movable in the front-rear direction. The connecting member 70 moves in the front-rear direction via the second rack gear 712 due to the rotation of the second pinion gear 42. The connecting member 70 is configured to move the driving sleeve 55 to the position Ph by moving to the foremost position within the moving range, and to move the driving sleeve 55 to the position Pd by moving to the rearmost position. Further, the connecting member 70 is configured such that its length in the front-rear direction is such that it moves to the foremost position when the mode switching operation unit 6 is moved to the position P2, and moves to the rearmost position when the mode switching operation unit 6 is moved to the position P1.

[0069] Details of the connecting member 70 will be described. The first member 71 moves in the front-rear direction as the second rack gear 712 moves in the front-rear direction in response to the rotation of the second pinion gear 42. In the present embodiment, the first member 71 has a plate-like portion 711 that is orthogonal to the vertical direction and extends in the front-rear direction, and an upward convex portion 717 (see FIG. 2) that is provided at the front end portion of the plate-like portion 711 and protrudes upward from the plate-like portion 711. The second rack gear 712 is provided on the plate-like portion 711. The first member 71 further has a right convex portion 713 that protrudes to the right from the front end portion of the plate-like portion 711, and a left convex portion 714 that protrudes to the left from the front end portion of the plate-like portion 711.

[0070] The second member 72 is a rod-shaped member extending in the front-rear direction. The rear end portion of the second member 72 is inserted into the upward convex portion 717 of the first member 71 and is connected to the first member 71. In FIG. 6, by showing the inside of the upward convex portion 717, the connection location between the first member 71 and the second member 72 is represented. The third member 73 is a member formed in a rectangular shape, and the front end portion of the second member 72 is connected to the rear end portion of the third member 73. The engaging arm 74 is an elongated plate-shaped member extending in the front-rear direction. As shown in FIG. 2, the rear end portion of the engaging arm 74 is connected to the front end portion of the third member 73. The bifurcated front end portion of the engaging arm 74 is bent downward in a hook shape and engages with an annular groove 551 formed on the outer peripheral portion of the driving sleeve 55. In the present embodiment, a through hole is provided in the rear end portion of the engaging arm 74, and a connecting pin 76 is inserted through the through hole. Further, a torsion spring 77 is held at the left end portion of the front end portion of the third member 73, and the lower end portion of the connecting pin 76 is sandwiched between the two arms of the torsion spring 77 by the biasing force of the torsion spring 77. Note that the arm disposed on the rear side of the connecting pin 76 among the two arms is locked to the third member 73.

[0071] With the above configuration, when the mode switching operation unit 6 is moved rightward and disposed at the position P2 (see FIG. 5), the rightward movement of the mode switching operation unit 6 is converted by the first conversion mechanism 40 into a linear movement of the connection member 70 forward. The connection member 70 moves to the foremost position within the movement range (see FIGS. 1, 2, and 6), and the driving sleeve 55 is moved to the position Ph (see FIG. 2). As a result, the operation mode of the hammer drill 100 is switched to the impact mode.

[0072] Further, as shown in FIG. 7, when the mode switching operation unit 6 is moved leftward to the position P1, the leftward movement of the mode switching operation unit 6 is converted by the first conversion mechanism 40 into a linear motion of the connecting member 70 rearward. Then, as shown in FIGS. 8 and 9, the connecting member 70 moves to the rearmost position within the movement range, and the driving sleeve 55 is moved to the position Pd. As a result, the operation mode of the hammer drill 100 is switched to the rotary percussion mode.

[0073] In addition, as shown in FIG. 10, when the mode switching operation unit 6 is moved rightward or leftward to the position Pn, the leftward or rightward movement of the mode switching operation unit 6 is converted by the first conversion mechanism 40 into a linear motion of the connecting member 70 forward or rearward along the drive shaft A1. Then, as shown in FIGS. 11 and 12, the connecting member 70 moves between the foremost position and the rearmost position within the movement range, and the driving sleeve 55 moves between the position Ph and the position Pd. As a result, the operation mode of the hammer drill 100 is switched to the neutral mode.

[0074] Next, the lock mechanism 8 will be described with reference to FIGS. 13 to 15. In the present embodiment, the lock mechanism 8 includes a lock lever 180 and a first member 71.

[0075] The lock lever 180 is at the upper end of the handle 17 (near the connecting portion 173), is provided above the switch lever 171, and is supported so as to be movable in the left - right direction with respect to the handle 17. In the present embodiment, the lock lever 180 includes a rod - shaped main body portion 181 extending in the left - right direction and two locking pieces 182 protruding downward from the lower end of the main body portion 181. As shown in FIG. 13, both left - right ends of the main body portion 181 are exposed from openings 177 provided in the left wall and the right wall of the connecting portion 173. The user can operate the lock lever 180 by pushing the main body portion 181 leftward or rightward with respect to the handle 17.

[0076] The switch lever 171 of this embodiment is provided with two locking projections 178 that protrude upward. As shown by the solid line in FIG. 13, the two locking pieces 182 of the lock lever 180 are spaced apart in the left-right direction so that the locking projections 178 of the switch lever 171 can be disposed between the two locking pieces 182. Note that, as shown by the dashed-dotted line in FIG. 13, the interval between the two locking pieces 182 of the lock lever 180 is equal to the interval between the two locking projections 178 of the switch lever 171.

[0077] The lock lever 180 is movable between a lockable position where the switch lever 171 can be locked in the on state and a non-lockable position where the switch lever 171 cannot be locked in the on state. The lockable position is the position of the lock lever 180 where the locking piece 182 of the lock lever 180 exists on the movement path of the locking projection 178 of the switch lever 171, as shown by the dashed-dotted line in FIG. 13. In the lockable position, the rear end of the locking piece 182 of the switch lever 171 abuts against the front end of the locking projection 178 of the switch lever 171 that has moved to the on position, so that the switch lever 171 can be held in the on position. The non-lockable position is the position of the lock lever 180 where the locking piece 182 of the lock lever 180 exists at a position outside the movement path of the locking projection 178 of the switch lever 171, as shown by the solid line in FIG. 13. In the non-lockable position, the locking projection 178 does not interfere with the movement of the locking piece 182 in the front-rear direction. Therefore, the switch lever 171 can move between the on position and the off position. Note that the lock lever 180 is always disposed in the non-lockable position shown by the solid line in FIG. 13 by the user in order to enable the operation of the switch lever 171, and is moved to the lockable position by the user only when the switch lever 171 is locked in the on state. Although not shown, in this embodiment, the lock lever 180 is held in the non-lockable position or the lockable position by the biasing force of the biasing member.

[0078] Returning to the description of the lock lever 180. A lock hole 184 penetrating the main body portion 181 in the front-rear direction is formed at a substantially central portion of the main body portion 181 in the left-right direction. The height in the vertical direction and the width in the left-right direction of the lock hole 184 are formed to be the height and width into which the plate-like portion 711 of the first member 71 can be inserted. The first member 71 constitutes a part of the connecting member 70 as described above and moves in the front-rear direction according to the operation of the mode switching operation portion 6.

[0079] In FIGS. 6, 9, and 12, the positional relationship between the connecting member 70 and the lock hole 184 is shown. The plate-like portion 711 of the first member 71 is moved to the rearmost position within the movement range by the first conversion mechanism 40 when the mode switching operation portion 6 is moved to the position P1 (that is, when the rotary impact mode is selected) and engages with the lock hole 184. When the mode switching operation portion 6 is moved to the position Pn or the position P2 (that is, when the neutral mode or the impact mode is selected), the plate-like portion 711 is moved forward from the rearmost position by the first conversion mechanism 40 so that the engagement with the lock hole 184 is released, and extends in the front-rear direction.

[0080] With the above configuration, when the mode switching operation portion 6 is moved to the position P1 (that is, when the rotary impact mode is selected), the connecting member 70 moves to the rearmost position within the movement range, and the plate-like portion 711 engages with the lock hole 184 (see FIGS. 9 and 15). Then, the left-right movement of the lock lever 180 is restricted by the first member 71, and the lock lever 180 stays at the non-lockable position. On the other hand, when the mode switching operation portion 6 is moved to the position P2 (that is, when the impact mode is selected), the connecting member 70 moves to the foremost position within the movement range, and the engagement between the plate-like portion 711 and the lock hole 184 is released (see FIGS. 6 and 14). Therefore, the lock lever 180 can move in the left-right direction. In this state, when the lock lever 180 is moved to the lockable position by the operation of the user, the on state of the switch lever 171 is maintained. That is, in the impact mode, the user can continue the on state of the switch lever 171 without continuously pressing the switch lever 171 by pushing the lock lever 180 into the lockable position.

[0081] Next, the mode detection unit 90 of the hammer drill 100 and the control of the motor 2 by the controller 9 using the mode detection unit 90 and the acceleration sensor 95 will be described.

[0082] First, the mode detection unit 90 will be described. The mode detection unit 90 is configured to detect the operation mode of the hammer drill 100 (the current actual operation mode, specifically, the position of the driving sleeve 55). In the present embodiment, the mode detection unit 90 includes a first switch 91 and a second switch 92 disposed on the upper portion of the gear housing 12. In the present embodiment, the first switch 91 and the second switch 92 are push-type microswitches. The first switch 91 and the second switch 92 are configured to output a signal (on signal) to the controller 9 when pressed.

[0083] The first switch 91 is disposed opposite to the right convex portion 713 behind the right convex portion 713 of the first member 71 and is fixed to the gear housing 12. The right convex portion 713 and the first switch 91 are arranged such that when the connecting member 70 moves to the rearmost position (that is, when the driving sleeve 55 moves to the position Pd), the rear end surface of the right convex portion 713 abuts against the first switch 91 and pushes the first switch 91 backward. Also, the second switch 92 is disposed opposite to the left convex portion 714 in front of the left convex portion 714 of the first member 71 and is fixed to the gear housing 12. The left convex portion 714 and the second switch 92 are arranged such that when the connecting member 70 moves to the foremost position (that is, when the driving sleeve 55 moves to the position Ph), the front end surface of the left convex portion 714 abuts against the second switch 92 and pushes the second switch 92 forward.

[0084] With such a configuration, the controller 9 can determine the operation mode of the hammer drill 100 from the detection results of the first switch 91 and the second switch 92 (that is, the position of the driving sleeve 55). Specifically, when an on-signal is output from the first switch 91 to the controller 9, the operation mode of the hammer drill 100 is the rotary percussion mode, and when an on-signal is output from the second switch 92 to the controller 9, the operation mode is the percussion mode. Also, when no on-signal is output from the first switch 91 and the second switch 92, the operation mode is the neutral mode.

[0085] Next, the control of the motor 2 by the controller 9 using the detection results of the acceleration sensor 95 and the mode detection unit 90 will be described. In the rotary percussion mode involving a rotational operation, when the tip tool 101 is locked to the workpiece and the tool holder 30 enters a non-rotatable state (also referred to as a locked state or a blocking state), an excessive reaction torque acts on the tool body 10, and a phenomenon (also referred to as a kickback phenomenon) may occur where the tool body 10 rotates excessively around the drive shaft A1.

[0086] In this embodiment, when the motor 2 is driven, the controller 9 acquires the detection result of the acceleration sensor 95 and sequentially determines whether the detection result is equal to or greater than a predetermined threshold value. The threshold value is the threshold value of the acceleration when the tool body 10 is in an excessively rotated state, and is pre-stored in the memory provided in the controller 9. The threshold value can be obtained through experiments or simulations.

[0087] Also, the controller 9 determines whether the operation mode is the rotary percussion mode using the detection result of the mode detection unit 90. In this embodiment, when the controller 9 acquires the on-signal of the first switch 91, it determines that the operation mode is the rotary percussion mode.

[0088] When the acceleration is equal to or greater than the threshold value and the operation mode is the rotary impact mode, the controller 9 stops driving the motor 2. By doing so, the excessive rotation state of the hammer drill 100 is eliminated. Note that even if the detection result of the acceleration sensor 95 is equal to or greater than the threshold value, if the detection result of the mode detection unit 90 does not indicate the rotary impact mode (when the ON signal of the first switch 91 is not acquired), the controller 9 continues to drive the motor 2. By doing so, for example, even when the detection result of the acceleration sensor 95 temporarily becomes equal to or greater than the threshold value due to the impact of the hammer drill 100 contacting a wall or the like near the workpiece during the machining operation in the impact mode, the user can continue the machining operation in the impact mode.

[0089] According to the hammer drill 100 of the present embodiment described above, the following effects can be obtained.

[0090] In the hammer drill 100 of the present embodiment, the mode switching operation unit 6 for switching the operation mode is provided at a position facing the gripping portion 170 of the tool body 10. Therefore, even when the hammer drill 100 collides with the ground, a wall, or the like, such as when the hammer drill 100 accidentally falls, the mode switching operation unit 6 is less likely to collide with the ground, a wall, or the like. Therefore, it is possible to suppress damage to the mode switching operation unit 6 due to an external impact being applied to the hammer drill 100.

[0091] Further, in the hammer drill 100, compared with a configuration in which the operation unit for switching the operation mode is arranged on a surface around the drive shaft A1, such as the upper surface or side surface of the hammer drill 100, the distance (center height) from the drive shaft A1 to the outer surface around the drive shaft A1 in the hammer drill 100 can be shortened. Therefore, the operability of the hammer drill 100 can be improved.

[0092] Further, in the hammer drill 100, compared with a configuration in which an operation unit for switching the operation mode is arranged on a surface around the drive shaft A1 such as the upper surface or side surface of the hammer drill 100, the outer surface around the drive shaft A1 can be configured smoothly. Therefore, according to the present embodiment, a hammer drill 100 with improved design can be provided.

[0093] The mode switching operation unit 6 is provided at a position of the tool body 10 facing the switch lever 171. Therefore, the user can operate the mode switching operation unit 6 and the switch lever 171 with one hand (the same hand). For example, it is also possible to switch the operation mode and drive the motor 2 without moving the arm. Therefore, according to the present embodiment, a hammer drill 100 with improved operability can be provided.

[0094] Further, the hammer drill 100 includes a transmission mechanism 4 configured to transmit the movement of the mode switching operation unit 6 to the driving sleeve 55 to move the driving sleeve 55 parallel to the drive shaft A1. Therefore, the transmission mechanism 4 can transmit the left-right movement of the mode switching operation unit 6 provided at a position facing the grip portion 170 to the driving sleeve 55 on the tool holder 30 that is rotationally driven around the drive shaft A1.

[0095] Further, the transmission mechanism 4 is configured to move the driving sleeve 55 to the position Pd to transmit the torque of the motor 2 to the tool holder 30 when the mode switching operation unit 6 is moved to the position P1, and to move the driving sleeve 55 to the position Ph to cut off the torque transmission when the mode switching operation unit 6 is moved to the position P2. Therefore, in the hammer drill 100, by operating the mode switching operation unit 6 to move the driving sleeve 55, the operation mode can be switched between the rotary impact mode and the impact mode.

[0096] The transmission mechanism 4 includes a first conversion mechanism 40 configured to convert the linear sliding of the mode switching operation unit 6 in the left - right direction into rotational motion and further convert the rotational motion into linear motion along the drive shaft A1. Therefore, compared with a configuration without the first conversion mechanism 40, the degree of freedom in the arrangement of the driving sleeve 55 and the mode switching operation unit 6 in the hammer drill 100 and the freedom of movement in the configuration of the transmission mechanism 4 can be improved.

[0097] On the upper and lower sides of the base 62 of the mode switching operation unit 6, leaf springs 125 held by the gear housing 12 are arranged. The mode switching operation unit 6 is configured to be held at a position P1 corresponding to the rotary percussion mode and a position P2 corresponding to the percussion mode by the biasing force of the leaf springs 125. Therefore, according to the present embodiment, it is possible to provide a hammer drill 100 in which the mode switching operation unit 6 can be easily positioned at the position P1 or the position P2 while being moved in the left - right direction.

[0098] The hammer drill 100 of the present embodiment is provided with a lock mechanism 8. When the tip tool 101 is in the percussion mode where it only performs the percussion operation, the first member 71 is configured not to engage with the lock lever 180 and to allow the lock lever 180 to move to the lockable position. Therefore, in a machining operation where the percussion operation is continuously performed for a relatively long time, the user does not have to continuously press the switch lever 171. Thus, the burden on the user during the machining operation can be reduced. Also, when the tip tool 101 is in the rotary percussion mode where it performs a rotational operation, the first member 71 is configured to engage with the lock lever 180 and hold the lock lever 180 at the non - lockable position. Therefore, for example, even if the tip tool 101 is locked to the workpiece, the user can stop the drive of the motor 2 only by releasing the pressure on the switch lever 171. Thus, a highly safe hammer drill can be provided.

[0099] Furthermore, the hammer drill 100 includes a mode detection unit 90 and an acceleration sensor 95. The controller 9 is configured to stop driving the motor 2 when it determines from the detection result of the acceleration sensor 95 that the tool body 10 is in a state of excessive rotation and from the detection result of the mode detection unit 90 that the operation mode is the rotary percussion mode. Therefore, the safety of the hammer drill 100 can be enhanced. Also, the controller 9 is configured to continue driving the motor 2 even when the detection result of the acceleration sensor 95 indicates that the tool body 10 is in a state of excessive rotation but the operation mode is the percussion mode. Therefore, for example, even when during a machining operation in the percussion mode, the detection result of the acceleration sensor 95 temporarily reaches a value indicating a state of excessive rotation due to an impact caused by the hammer drill 100 contacting a wall or the like near the workpiece, the user can continue the machining operation in the percussion mode. Thus, it is possible to prevent the motor 2 from stopping unintentionally by the user's intention during the percussion mode. That is, according to the present embodiment, a hammer drill 100 with improved safety and operability can be provided.

[0100] Also, in the hammer drill 100, the acceleration sensor 95 is housed in the handle 17, and the tool body 10 and the handle 17 are connected via elastic members 175, 176. Therefore, the vibration of the tool body 10 transmitted to the acceleration sensor 95 can be reduced, so the acceleration sensor 95 can have a longer service life.

[0101] Furthermore, in the present embodiment, the acceleration sensor 95 is housed in the lower part of the handle 17. Therefore, compared with the case where the acceleration sensor 95 is housed at a position closer to the drive shaft A1, such as the upper part of the handle 17, the detection accuracy of the rotation around the drive shaft A1 of the tool body 10 can be improved.

[0102] <Corresponding relationship> The corresponding relationship between each component of the above embodiment and each component of the technology of the present disclosure is shown below. However, each component of the embodiment is merely an example and does not limit each component of the technology of the present disclosure.

[0103] The hammer drill 100 is an example of the "rotary percussion tool" of the present disclosure. The motor 2 is an example of the "motor" of the present disclosure. The tip tool 101 is an example of the "tip tool" of the present disclosure. The drive shaft A1 is an example of the "drive shaft" of the present disclosure. The rotary percussion mode is an example of the "first mode" of the present disclosure. The percussion mode is an example of the "second mode" of the present disclosure. The drive mechanism 3 is an example of the "drive mechanism" of the present disclosure. The tool body 10 is an example of the "tool body" of the present disclosure. The gripping portion 170 is an example of the "gripping portion" of the present disclosure. The handle 17 is an example of the "handle" of the present disclosure. The mode switching operation unit 6 is an example of the "first operating member" of the present disclosure. The switch lever 171 is an example of the "second operating member" of the present disclosure. The positions P1 and P2 are examples of the "first position" and the "second position" of the present disclosure, respectively. The tool holder 30 is an example of the "tool holder" of the present disclosure. The driving sleeve 55 is an example of the "clutch member" of the present disclosure. The positions Pd and Ph are examples of the "third position" and the "fourth position" of the present disclosure, respectively. The transmission mechanism 4 is an example of the "transmission mechanism" of the present disclosure. The first conversion mechanism 40 is an example of the "conversion mechanism" of the present disclosure. The first pinion gear 41 and the second pinion gear 42 are examples of the "at least one pinion gear" of the present disclosure. The first rack gear 621 and the second rack gear 712 are examples of the "first rack gear" and the "second rack gear" of the present disclosure, respectively. The leaf spring 125 is an example of the "biasing member" of the present disclosure. The lock lever 180 is an example of the "locking member" of the present disclosure. The first member 71 is an example of the "lock control member" of the present disclosure. The first switch 91 and the mode detection unit 90 are an example of the "mode detection unit" of the present disclosure. The acceleration sensor 95 is an example of the "rotation detection unit" of the present disclosure. The controller 9 is an example of the "control unit" of the present disclosure. The elastic members 175 and 176 are an example of the "elastic member" of the present disclosure.

[0104] <Other embodiments> In the above embodiment, the hammer drill 100 may be configured to operate with power supplied from a rechargeable battery instead of an external AC power supply. In this case, instead of the power cord 19, for example, a battery mounting portion where the battery can be attached and detached may be provided at the lower end of the handle 17.

[0105] The mode switching operation unit 6 may be provided at a position facing the gripping portion 170 of the tool body 10, for example, on the rear wall of the motor housing 13. With such a configuration, it is also possible to prevent the mode switching operation unit 6 from being damaged due to the dropping of the hammer drill 100 or the like.

[0106] The mode switching operation unit 6 is not limited to the left - right direction. For example, it may be configured to linearly move in the up - down direction. Also, the movement range of the mode switching operation unit 6 is not limited to a straight line and may be, for example, arc - shaped.

[0107] The mode detection unit 90 only needs to be configured to be able to detect at least the rotary impact mode. For example, the mode detection unit 90 does not necessarily need to include the second switch 92. In this case, when the detection result of the acceleration sensor 95 is equal to or greater than the threshold value, the controller 9 may stop the motor 2 if it acquires the signal that the first switch 91 has been pressed, and may continue to drive the motor 2 if it does not acquire the signal that the first switch 91 has been pressed. Also, the mode detection unit 90 is not limited to a push - type microswitch and may be configured by other detectors (for example, contact detectors including switches of other types, non - contact detectors including magnetic sensors and optical sensors) that detect the position (movement) of the driving sleeve 55.

[0108] Instead of the acceleration sensor 95, the hammer drill 100 may be provided with another detection device capable of detecting the rotational state around the drive shaft A1 of the tool body 10. As the other detection device, a speed sensor, an angular velocity sensor, or an angular acceleration sensor may be provided.

[0109] In the above-described embodiment, the hammer drill 100 was operable in a plurality of operation modes including a rotary percussion mode and a percussion mode. In contrast, the above embodiment may be applied to a rotary percussion tool configured to perform, for example, a rotary percussion mode, a percussion mode, and a rotation mode. In this case, the drive control of the motor 2 in the rotation mode is the same as that in the rotary percussion mode.

[0110] The first conversion mechanism 40 had a first rack gear 621, a first pinion gear 41, a first shaft 43, a second pinion gear 42, and a second rack gear 712. In contrast, the pinion gear engaging with the first rack gear 621 and the pinion gear engaging with the second rack gear 721 may be common. That is, the number of pinion gears provided in the first conversion mechanism 40 may be one. For example, the first conversion mechanism 40 may be composed of a first rack gear 621, a pinion gear meshing with the first rack gear 621, and a second rack gear 712 meshing with the pinion gear. In this case, the pinion gear can convert the sliding of the first rack gear 621 in the left-right direction into a rotational motion and then into a linear motion parallel to the drive shaft A1 of the second rack gear 712.

[0111] The configuration of the transmission mechanism 4 only needs to be configured to move the driving sleeve 55 along the drive shaft A1 in response to the sliding within a predetermined range of the mode switching operation unit 6, and is not limited to the configuration of the above embodiment. Further, when the transmission mechanism 4 includes the connecting member 70, the connecting member 70 only needs to connect the first conversion mechanism 40 and the driving sleeve 55, and the number and configuration of the components constituting the connecting member 70 and the connection mode of each component are not limited to the above embodiment.

[0112] In the above-described embodiment, an example in which the drive control of the motor 2 is executed by the CPU has been given. However, instead of the CPU, other types of control circuits, for example, programmable logic devices such as ASIC (Application Specific Integrated Circuits) and FPGA (Field Programmable Gate Array) may be employed. Further, the drive control process of the motor 2 may be distributedly processed by a plurality of control circuits.

[0113] The present disclosure is not limited to the above-described embodiments, and can be realized in various configurations without departing from the gist thereof. For example, the technical features in the embodiments corresponding to the technical features in each of the forms described in the summary of the invention can be appropriately replaced or combined in order to solve part or all of the above-described problems or to achieve part or all of the above-described effects. Further, if the technical feature is not described as essential in this specification, it can be appropriately deleted.

Explanation of Reference Numerals

[0114] 2...Motor 3...Drive mechanism 4...Transmission mechanism 6...Mode switching operation unit 8...Lock mechanism 9...Controller 10...Tool body 12...Gear housing 13...Motor housing 17...Handle 19...Power cord 20...Motor main body part 21...Stator 23...Rotor 25...Motor shaft 29...Drive gear 30...Tool holder 31...Motion conversion mechanism 33...Striking mechanism 35...Rotary transmission mechanism 36... Intermediate shaft 40... First conversion mechanism 41... First pinion gear 42... Second pinion gear 43... First shaft 54... Clutch mechanism 55... Driving sleeve 56... Gear sleeve 61... Main operation part 62... Base part 62p1... Recess 62p2... Recess 62pn... Recess 70... Connecting member 71... First member 72... Second member 73... Third member 74... Engagement arm 76... Connecting pin 77... Torsion spring 90... Mode detection part 91... First switch 92... Second switch 95... Acceleration sensor 100... Hammer drill 101... Tip tool 121... Rear wall 122... Opening 125... Leaf spring 126... Protrusion 132... Rear wall 170... Gripping part 171... Switch lever 172... Main switch 173... Connecting part 174... Connecting part 175... Elastic member 177... Opening 178... Locking protrusion 180... Lock lever 181... Body part 182... Locking piece 184... Lock hole 301... Lock ring 311... Crankshaft 312... Driven gear 313... Connecting rod 315... Piston 317... Cylinder 331... Striker 333... Impact bolt 335... Air chamber 361... Small bevel gear 362... Driven gear 551... Annular groove 561... Large bevel gear 611... Plate part 612... Lever 621... First rack gear 711... Plate-shaped part 712... Second rack gear 713... Right convex part 714... Left convex part 717... Upper convex part A1... Driving shaft A2... Rotating shaft A3... Rotating shaft

Claims

1. A rotary impact tool, comprising a motor, a drive mechanism selectively operable in a plurality of operation modes including a first mode in which the tip tool is rotationally driven around a drive shaft at least by the power of the motor, and a second mode in which only an operation of linearly driving the tip tool along the drive shaft is performed, a tool body housing the motor and the drive mechanism, a handle having a grip portion extending in a direction intersecting the drive shaft and gripped by a user, a first operation member provided at a position of the tool body facing the grip portion and configured to be able to switch the operation mode of the drive mechanism by being operated by the user, a second operation member provided on the grip portion, maintained at an off position at all times, and configured to be moved to an on position by being pressed by the user to drive the motor, a lock member configured to be movable between a lockable position where the second operation member can be locked in the on position and a non-lockable position where the second operation member cannot be locked in the on position by an operation of the user, a lock control member configured to be movable along the drive shaft, disposed at a position interfering with the lock member in the first mode in response to an operation of the first operation member to hold the lock member in the non-lockable position, and disposed at a position not interfering with the lock member in the second mode in response to an operation of the first operation member to allow the lock member to move to the lockable position, A rotary impact tool comprising the same.

2. The rotary impact tool according to claim 1, wherein the first operation member is provided at a position facing the second operation member.

3. The rotary impact tool according to claim 1 or claim 2, wherein the first operation member, It is slidable within a predetermined range in a direction intersecting the drive shaft, and in response to being moved to a first position within the predetermined range, the operation mode of the drive mechanism is switched to the first mode, A rotary impact tool configured to switch the operation mode of the drive mechanism to the second mode in response to being moved to a second position different from the first position within the predetermined range.

4. A rotary impact tool according to any one of claims 1 to 3, A tool holder configured to removably hold the tip tool and be rotationally driven around the drive shaft by the torque transmitted from the motor, A clutch member provided on the tool holder and movable along the drive shaft in response to an operation of the first operating member, configured to transmit the torque when disposed at a third position in the direction along the drive shaft, and configured to cut off the transmission of the torque when disposed at a fourth position different from the third position in the direction along the drive shaft, The drive mechanism is configured to operate in the first mode when the clutch member is disposed at the third position and operate in the second mode when the clutch member is disposed at the fourth position, a rotary impact tool.

5. A rotary impact tool according to claim 4, which depends on claim 3, Further comprising a transmission mechanism configured to transmit the sliding within the predetermined range of the first operating member to the clutch member to move the clutch member along the drive shaft, a rotary impact tool.

6. A rotary impact tool according to claim 5, The transmission mechanism includes a conversion mechanism configured to convert the linear sliding within the predetermined range of the first operating member into a rotational motion and further convert the rotational motion into a linear motion along the drive shaft, a rotary impact tool.

7. The rotary impact tool according to claim 6, wherein the conversion mechanism a first rack gear that slides in accordance with the linear sliding of the first operating member within the predetermined range; a first pinion gear engaged with the first rack gear and a second pinion gear that rotates in accordance with the rotation of the first pinion gear; a second rack gear engaged with the second pinion gear and configured to convert the rotational movement of the second pinion gear into linear movement along the drive shaft. The rotary impact tool comprises:

8. The rotary impact tool according to claim 3, claim 4 dependent on claim 3, or any one of claims 5 to 7, wherein the rotary impact tool further comprises a biasing member that biases the first operating member; the first operating member is configured to be held at the first position and the second position by the biasing force of the biasing member.

9. The rotary impact tool according to any one of claims 1 to 8, wherein a mode detection unit for detecting that the operation mode of the drive mechanism is at least the first mode; a rotation detection unit for detecting the rotational state of the tool body around the drive shaft; a control unit configured to be able to control the drive of the motor, and configured to stop the motor when the operation mode is the first mode and the state of the tool body is a state of excessive rotation around the drive shaft, using the detection results of the rotation detection unit and the mode detection unit. The rotary impact tool comprises:

10. The rotary impact tool according to claim 9, wherein the rotary impact tool comprises an elastic member that connects the handle to the tool body so as to be relatively movable along the drive shaft; the rotation detection unit is housed in the handle.

11. A rotary impact tool, wherein A motor, A drive mechanism that can selectively operate in a plurality of operation modes including a first mode that at least performs an operation of rotationally driving a tip tool around a drive shaft by the power of the motor, and a second mode that only performs an operation of linearly driving the tip tool along the drive shaft, A tool body that houses the motor and the drive mechanism, A handle having a grip portion that extends in the vertical direction intersecting the front-rear direction that is the extending direction of the drive shaft and is gripped by a user, A first operation member that is configured to be able to switch the operation mode of the drive mechanism by being operated by the user and is provided at a position facing the grip portion of the tool body. The center in the vertical direction is disposed below the drive shaft, and the first operation member is linearly slidable in the left-right direction intersecting the front-rear direction and the vertical direction, A tool holder that removably holds the tip tool and is configured to be rotationally driven around the drive shaft by torque transmitted from the motor, A clutch member provided on the tool holder and movable along the drive shaft between a position where torque is transmitted to the tool holder in response to an operation of the first operation member and a position where torque transmission is blocked, A transmission mechanism configured to transmit the linear sliding of the first operation member to the clutch member to move the clutch member along the drive shaft, The drive mechanism includes a crankshaft that rotates by the rotation of the motor and a striking mechanism that strikes the tip tool by the rotation of the crankshaft, The transmission mechanism includes A first shaft disposed behind the crankshaft and having a rotating shaft extending in the vertical direction. The lower end is disposed below the drive shaft and is operably connected to the first operation member, and the upper end is disposed above the drive shaft, A connecting member operably connected to the upper end of the first shaft and extending in the front-rear direction, Convert the linear sliding of the first operating member in the left-right direction into rotational motion around the rotation axis of the first shaft, and further convert the rotational motion of the first shaft into linear motion along the drive shaft of the connecting member and transmit it to the clutch member. Rotary impact tool.

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