hammer drill

Abstract

This invention provides a hammer drill. The hammer drill selectively operates in multiple modes, including a first mode in which the tip tool is driven only linearly along the drive axis, and a second mode in which the tip tool is at least rotated. The hammer drill includes a switch, a motor, a switch operating component, a locking component, and a mode detection device. The switch operating component has a main body and a protrusion movable between a protruding position and a retracted position. The locking component is movable between a locked-out position and a locked position. The protrusion is integrated with the plunger of the solenoid and is positioned in the protruding position when the current mode is the first mode, and in the retracted position when the current mode is the second mode. Accordingly, improvements related to the locking structure of the operating component of the motor-driven switch can be provided.

Description

Technical Field

[0001] This invention relates to a hammer drill. Background Technology

[0002] Hammer drills have the following modes: a mode in which the tip tool is driven only linearly along the drive axis; and a mode in which the tip tool is driven to rotate at least about the drive axis. In the mode in which the tip tool is driven only linearly along the drive axis, shaving or foreign matter removal operations (i.e., surface treatment before painting) are typically performed. To eliminate the inconvenience of the user needing to continuously press the operating component during such operations, a locking structure for holding the operating component of a switch in the ON position is known. For example, the hammer drill disclosed in Patent Document 1 has a locking unit comprising an actuator structural element that operates according to the mode, and a locking structural element that moves via the actuator structural element. The locking structural element holds the operating component in the ON position by engaging with an engagement recess provided on a guide structural element of the operating component of the switch. [Existing technical documents] [Patent Literature]

[0003] Patent Document 1: U.S. Patent No. 11052526 Summary of the Invention [The technical problem that the invention aims to solve]

[0004] In the hammer drill of Patent Document 1, a complex locking structure is arranged within the limited space of the gripping part. Therefore, there is room for improvement in this locking structure.

[0005] In view of the above, a non-limiting object of the present invention is to provide an improvement related to the locking structure of the operating component of a switch for motor drive. [Technical solutions used to solve technical problems]

[0006] According to a non-limiting aspect of the present invention, a hammer drill is provided, configured to selectively operate in multiple modes, including a first mode in which the tip tool is driven only linearly along a drive axis, and a second mode in which the tip tool is driven to rotate at least about the drive axis. Furthermore, the second mode may be either a mode in which only the tip tool is driven to rotate, or a mode in which the tip tool is driven to rotate while also being driven linearly.

[0007] The hammer drill includes a switch, a motor, a switch operating component, a locking component, and a mode detection device. The motor is configured to be driven when the switch is in the ON state. The switch operating component has a body and a protrusion. The body is configured to be normally held in the OFF position and move to the ON position in response to manual operation by the user. The body is configured to keep the switch OFF in the OFF position and ON in the ON position. The protrusion is movable between a protruding position and a retracted position. In the protruding position, the protrusion extends from the body. In the retracted position, the protrusion does not extend from the body. Alternatively, the amount of protrusion from the body in the retracted position is less than the amount of protrusion in the protruding position. The locking component is movable between a locked-out position and a locked position in response to manual operation by the user. The locking component is configured to allow the switch operating component to move between the ON and OFF positions in the locked-out position. In the locked position, the locking component abuts against the protrusion in the protruding position, holding the switch operating component in the ON position (preventing movement to the OFF position). The mode detection device is configured to electrically detect the current mode of the hammer drill.

[0008] The main body of the switch operating component houses a solenoid, which is configured to operate based on the detection results of the mode detection device. Furthermore, the solenoid, a known electrical component, is configured to convert electrical energy into linear mechanical energy using the magnetic field generated by flowing current through a coil; it is also called an actuator or linear actuator. The protrusion is integrated with the solenoid's plunger. The protrusion is configured to be in a protruding position when the current mode is mode 1, and in a retracted position when the current mode is mode 2.

[0009] In this type of hammer drill, a solenoid is housed within the main body of the switch operating component. Since the protrusion of the switch operating component is integrated with the plunger of the solenoid, the protrusion moves between a protruding position and a retracted position in response to the movement of the solenoid. The solenoid operates according to the detection result of the mode detection device, i.e., the current mode. In the first mode, the switch operating component can be held in the on position; however, in the second mode, it cannot be held in the on position. Thus, according to this method, the interior of the main body of the switch operating component is rationally and effectively utilized as the housing space for the solenoid, thereby achieving a compact locking structure capable of operating according to the mode. Attached Figure Description

[0010] Figure 1 This is a cross-sectional view of a hammer drill with the switch operating component in the off position, the protrusion in the protruding position, and the locking component in the unlocked position. Figure 2 yes Figure 1Sectional view II-II. Figure 3 yes Figure 1 A magnified view of a portion of the image. Figure 4 Is with Figure 3 The corresponding sectional view shows the state of the protrusion in the retracted position. Figure 5 Is with Figure 3 The corresponding sectional view shows the state of the switch operating component in the ON position. Figure 6 Is with Figure 2 The corresponding sectional view shows the state of the switch operating component in the ON position. Figure 7 Is with Figure 2 The corresponding sectional view shows the state where the switch operating component is in the ON position and the locking component is in the locked position. Figure 8 Is with Figure 3 The corresponding sectional view shows the state where the switch operating component is in the ON position and the locking component is in the locked position. Figure 9 Is with Figure 3 The corresponding sectional view shows the state where the switch operating component is in the ON position and the protrusion is in the ROCK position. Figure 10 This is a partial cross-sectional view of another hammer drill. Figure 11 yes Figure 10 XI-XI sectional view. [Explanation of reference numerals in the attached figures] 1A, 1B: Hammer drill; 10: Tool body; 11: Drive mechanism housing; 115: Rear wall; 13: Motor housing; 135: Rear wall; 15: Handle; 16: Holding part; 165: Front wall; 17: First connecting part; 171: Side wall; 172: Opening; 175: Front wall; 18: Second connecting part; 185: Front wall; 191: Elastic component; 193: Elastic component; 20: Controller; 21: Motor; 215: Motor shaft; 29: Power cord; 3: Drive mechanism; 30: Tool holder; 300: Top tool; 31: Motion conversion mechanism; 311: Crankshaft; 313: Connecting rod; 315: Piston; 32: Cylinder; 33: Impact structure element; 34: Striker; 35: Impact bolt 37: Rotary transmission mechanism; 371: Intermediate shaft; 372: Small bevel gear; 374: Clutch mechanism; 375: Gear sleeve; 376: Large bevel gear; 378: Transmission sleeve; 50: Mode setting component; 51: Mode switching mechanism; 52: Movable component; 521: Left arm; 522: Right arm; 53: Motion conversion mechanism; 6: Mode detection device; 61: First switch; 62: Second switch; 71: Switch operation component; 710: Main body; 711: Front wall; 713: Side wall; 71 5: Upper wall; 716: Opening; 72: Protrusion; 73: Solenoid; 731: Main body; 733: Plunger; 734: End cap; 735: Force spring; 75: Switch; 751: Main body; 753: Plunger; 8: Locking component; 81: Main body; 811: Left end; 812: Right end; 83: Protrusion; 85: Spring bearing part; 86: Holding component; 89: Extension; 9: Protrusion detection device; 91: Substrate; 93: Hall sensor; 95: Magnet; DX: Drive axis; RX: Rotation axis. Detailed Implementation

[0011] In a non-limiting embodiment of the invention, the solenoid can be a pull-type solenoid. The protrusion can be configured such that it is in a protruding position when the solenoid is in the open state, and moves to a retracted position when the solenoid is in the closed state. According to this embodiment, the solenoid is in the open state when the locking member abuts against the protrusion in the protruding position to hold the switch operating member in the closed position. Furthermore, when the solenoid is in the closed state, the protrusion is in the retracted position. In this way, the plunger of the solenoid only needs to bear the movement of the protrusion, eliminating the need for an additional load to hold the switch operating member in the closed position, thus improving the durability of the solenoid.

[0012] Based on, or instead of, the above-described embodiment, the hammer drill may further include a protrusion detection device configured to detect when a protrusion is in a protruding position. The motor may be configured to be prohibited from driving when the protrusion detection device detects that a protrusion is in a protruding position in the second mode. Furthermore, specifically, prohibiting driving means, for example, stopping driving and not starting driving. According to this embodiment, in the second mode where the tip tool is driven to rotate, even if the solenoid does not operate for some reason and thus keeps the switch operating component in the on position, motor driving is prohibited. Therefore, the safety of the hammer drill is improved.

[0013] Based on, or instead of, the above embodiments, a magnet can be disposed at the protruding end of the protrusion that protrudes from the main body. The protrusion detection device can be configured to detect the magnet when the protrusion is in the protruding position. The protrusion detection device can, for example, have a magnetic field detection sensor (e.g., a Hall sensor). According to this embodiment, a protrusion detection device with a reasonable structure can be realized.

[0014] Based on, or instead of, the above-described embodiment, the protrusion can move in a direction intersecting the moving direction of the main body of the switch operating member. According to this embodiment, compared to the case where the protrusion can move in the same direction as the main body, it is possible to avoid an increase in the size of the main body in the moving direction.

[0015] Based on, or instead of, the above-described embodiment, the protrusion can be moved in a direction intersecting the moving direction of the locking member. According to this embodiment, compared to the case where the protrusion can move in the same direction as the locking member, the locking member's size in the moving direction can be avoided.

[0016] Based on, or instead of, the above-described embodiments, the drive axis may define the front-to-back direction of the hammer drill. The hammer drill may also have a gripping portion extending in a vertical direction orthogonal to the drive axis. The main body of the switch operating member may be supported on the gripping portion in a manner that allows it to move substantially in the front-to-back direction between a disconnected position and an on position further rear of the disconnected position. The protrusion may be substantially movable in the vertical direction at the upper end of the switch operating member. The locking member may be configured to abut against the front region of the protrusion located in the protruding position in the locked position, preventing the switch operating member from moving from the on position to the disconnected position. According to this embodiment, a simple and reasonable structure capable of holding the switch operating member in the on position is achieved.

[0017] Based on or alternative to the above embodiments, the locking member can move in a left-right direction orthogonal to the front-back and up-down directions. According to this embodiment, since the movement directions (i.e., operating directions) of the switch operating member and the locking member are different, it is possible to prevent the user from accidentally operating one member while operating the other.

[0018] Based on, or alternative to, the above embodiments, the drive axis can define the front-to-back direction of the hammer drill. The hammer drill can also have a gripping portion extending in a vertical direction orthogonal to the drive axis. A switch can be disposed inside the gripping portion. A switch operating member can be supported on the gripping portion in a manner movable between an off position and an on position further rear of the off position. A solenoid can be positioned in the front-to-back direction further forward of the switch. According to this embodiment, by utilizing the space within the gripping portion and the space within the switch operating member, the switch and solenoid can be rationally arranged in adjacent positions.

[0019] Based on, or instead of, the above-described embodiments, the hammer drill may further include a tool body that houses the motor and a handle that includes a gripping portion. A switching operation component and a locking component may be supported on the handle. The tool body and the handle may be connected via at least one elastic component. According to this embodiment, the transmission of vibration from the tool body to the gripping portion can be suppressed.

[0020] Hereinafter, with reference to the accompanying drawings, representative and non-limiting embodiments of the present invention will be specifically described.

[0021] <First Implementation Method> Below, refer to Figures 1-9 The hammer drill 1A according to the first embodiment will be described. First, the general structure of the hammer drill 1A will be described. The hammer drill 1A is an electric tool capable of performing impact and rotation actions. The impact action is the following action: impacting the tip tool 300 which is detachably held in the tool holder 30, and driving the tip tool 300 linearly along the long axis (drive axis DX) of the tool holder 30. The rotation action is the action of driving the tip tool 300 to rotate about the drive axis DX.

[0022] like Figure 1 As shown, the hammer drill 1A has a tool body 10 and a handle 15 connected to the tool body 10.

[0023] The tool body 10 can also be referred to as the main housing. In this embodiment, the tool body 10 includes a drive mechanism housing 11 and a motor housing 13. The drive mechanism housing 11 primarily houses the tool holder 30 and the drive mechanism 3, and extends along the drive axis DX. The tool holder 30 is disposed within one end of the drive mechanism housing 11 in the long axis direction. The motor housing 13 primarily houses the motor 21, and protrudes from one end of the drive mechanism housing 11 in a direction intersecting (more specifically, orthogonal) the drive axis DX. That is, the tool body 10 is generally L-shaped.

[0024] The handle 15 is a hollow component in the shape of a U and includes a grip portion 16 for the user to hold, a first connecting portion 17, and a second connecting portion 18. The grip portion 16 extends in a direction intersecting (more specifically, substantially orthogonal) the drive axis DX. The first connecting portion 17 is the part that connects one end of the grip portion 16 in the long axis direction to the drive mechanism housing portion 11. The second connecting portion 18 is the part that connects the other end of the grip portion 16 in the long axis direction to the motor housing portion 13. A switch operating member 71 for the user to press is provided in the grip portion 16. A switch 75 is housed in the grip portion 16. When the switch 75 is turned on in response to the pressing operation of the switch operating member 71, the drive of the motor 21 begins, and the top tool 300 reciprocates and / or is driven to rotate via the drive mechanism 3.

[0025] The detailed structure of the hammer drill 1A will now be described. For convenience, in the following description, the extension direction of the drive axis DX will be defined as the front-rear direction of the hammer drill 1A. In the front-rear direction, the top end side of the tool holder 30 (the side into which the top tool 300 is inserted) will be defined as the front side of the hammer drill 1A, and its opposite side as the rear side. Furthermore, the direction orthogonal to the drive axis DX and corresponding to the extension direction of the gripping part 16 will be defined as the vertical direction of the hammer drill 1A. In the vertical direction, the side of the first connecting part 17 will be defined as the upper side, and its opposite side (the side of the second connecting part 18) as the lower side. And, the direction orthogonal to both the front-rear and vertical directions will be defined as the left-right direction.

[0026] First, the structural elements (structures) arranged in the tool body 10 (motor housing 13 and drive mechanism housing 11) will be described in turn.

[0027] like Figure 1 As shown, the motor housing 13 houses the motor 21 and the controller 20.

[0028] The motor 21 in this embodiment is a brushed motor. The motor 21 is driven by power supplied from an external AC power source via power line 29. In this embodiment, the motor 21 is configured such that the rotation axis RX of the motor shaft 215 intersects (more specifically, is orthogonal) the drive axis DX.

[0029] The controller 20 is disposed within the motor housing 13 at the rear of the motor 21. The controller 20 is a control device configured to control the operation of the hammer drill 1A. In this embodiment, the controller 20 has a circuit board and control circuitry mounted on the circuit board; detailed illustrations are omitted. The operation control of the hammer drill 1A by the controller 20 will be described later.

[0030] like Figure 1 As shown, the drive mechanism housing 11 houses a tool holder 30, a drive mechanism 3, a mode switching mechanism 51, and a mode detection device 6.

[0031] The tool holder 30 is an elongated cylindrical component with a long axis. The tool holder 30 is configured to detachably receive a portion of the tip tool 300 and hold the tip tool 300 in a manner that allows it to slide linearly along the extension direction of the long axis without rotating relative to the tool holder 30. Furthermore, the tool holder 30 is supported on the tool body 10 (drive mechanism housing 11) in a manner that allows it to rotate about its long axis. Therefore, the tip tool 300 can rotate integrally with the tool holder 30 about its long axis. Thus, the long axis of the tool holder 30 defines the drive axis DX of the tip tool 300.

[0032] The drive mechanism 3 is connected to the motor 21 (motor shaft 215) in an actuating manner and is driven by the power of the motor 21. The drive mechanism 3 in this embodiment includes a motion conversion mechanism 31 and an impact structural element 33 for impact actions, and a rotation transmission mechanism 37 for rotation actions.

[0033] The motion conversion mechanism 31 is connected to the motor 21 in an actuating manner, and is configured to convert the rotational motion of the motor shaft 215 into linear motion (more specifically, linear motion of the piston 315) along the drive axis DX for driving the tip tool 300. In this embodiment, a crank mechanism with a known structure is used as the motion conversion mechanism 31.

[0034] In simple terms, the motion conversion mechanism 31 includes a crankshaft 311, a connecting rod 313, and a piston 315. The crankshaft 311 is operatively connected to and rotates via the motor shaft 215. The crankshaft 311 has an eccentric pin. The connecting rod 313 is operatively connected to the eccentric pin and the piston 315. The piston 315 is housed in a cylinder 32 and is slidable within the cylinder 32. The cylinder 32 is coaxially disposed within the tool holder 30. The piston 315 reciprocates within the cylinder 32 along the drive axis DX in response to the drive of the motor 21.

[0035] The impact structure element 33 is configured to impact the tip tool 300 by moving linearly with the reciprocating motion of the piston 315, thereby driving the tip tool 300 linearly along the drive axis DX. In this embodiment, the impact structure element 33 includes a hammer 34 and a striker 35. The hammer 34 is slidably disposed within the cylinder 32. The striker 35 is slidably disposed within the tool holder 30 on the front side of the hammer 34. An air chamber is formed between the hammer 34 and the piston 315. The hammer 34 also reciprocates along the drive axis DX due to the pressure variation generated in the air chamber by the reciprocating motion of the piston 315. When the hammer 34 strikes the striker 35, the striker 35 transfers kinetic energy to the tip tool 300.

[0036] The rotary transmission mechanism 37 is connected to the motor shaft 215 in an actuating manner and is configured to transmit the rotation of the motor shaft 215 to the tool holder 30. The rotary transmission mechanism 37 is a gear reduction mechanism. Simply put, the rotary transmission mechanism 37 includes a small bevel gear 372, a large bevel gear 376, and a clutch mechanism 374.

[0037] A small bevel gear 372 is disposed on an intermediate shaft 371, which is connected to the motor shaft 215 via a reduction gear. A large bevel gear 376 is disposed around the tool holder 30. The large bevel gear 376 meshes with the small bevel gear 372 and rotates in response to the rotation of the motor shaft 215.

[0038] The clutch mechanism 374 includes a gear sleeve 375 and a drive sleeve 378. The gear sleeve 375 is supported around the rear end of the tool holder 30 in a manner that allows it to rotate relative to the tool holder 30. A large bevel gear 376 is integrally disposed with the gear sleeve 375. The drive sleeve 378 engages with the outer periphery of the tool holder 30 via a spline on the front side of the gear sleeve 375, is non-rotatable relative to the tool holder 30, and is movable in the back-and-forth direction.

[0039] When the rear end of the transmission sleeve 378 engages with the front end of the gear sleeve 375, the clutch mechanism 374 is in the transmission state. Therefore, when the motor 21 is driven, the tool holder 30 and even the top tool 300 held in the tool holder 30 are driven to rotate around the drive axis DX via the rotation transmission mechanism 37. On the other hand, when the rear end of the transmission sleeve 378 moves forward away from the front end of the gear sleeve 375, the clutch mechanism 374 is in the disengaged state. Therefore, rotation is not transmitted from the gear sleeve 375 to the transmission sleeve 378. That is, even if the motor 21 is driven, the tool holder 30 and the top tool 300 are not driven to rotate around the drive axis DX.

[0040] The mode switching mechanism 51 is configured to switch the mode (also called the operation mode) of the hammer drill 1A. More specifically, the drive mechanism 3 of this embodiment is configured to have two modes: an impact-only mode and a rotary impact mode, and can selectively operate in either mode. In the impact-only mode, the clutch mechanism 374 is in the cut-off state, and only the impact action is performed. In the rotary impact mode, the clutch mechanism 374 is in the transmission state, and both the impact action and the rotation action are performed simultaneously. The mode switching mechanism 51 is configured to switch the mode of the hammer drill 1A (drive mechanism 3) between the impact-only mode and the rotary impact mode by switching the state of the clutch mechanism 374 between the cut-off state and the transmission state.

[0041] More specifically, the mode switching mechanism 51 is actuated in a manner connected to the mode setting component 50 and the transmission sleeve 378 of the clutch mechanism 374. The mode switching mechanism 51 is configured to move the transmission sleeve 378 in the back-and-forth direction in response to the movement of the mode setting component 50.

[0042] The mode setting component 50 is a component manually operated by the user for setting (selecting) a mode (switching between impact-only mode and rotary impact mode). In this embodiment, the mode setting component 50 is a sliding rod supported at the rear end of the tool body 10 in a manner that allows it to slide in the left-right direction. The mode setting component 50 can move between a first position corresponding to the impact-only mode and a second position corresponding to the rotary impact mode.

[0043] The mode switching mechanism 51 of this embodiment includes a movable member 52 and a motion conversion mechanism 53. The movable member 52 is disposed above the motion conversion mechanism 31 (crank mechanism) of the drive mechanism 3. The movable member 52 is connected to the transmission sleeve 378 in an actuating manner via multiple connecting members and can move linearly in the front-back direction relative to the tool holder 30. The motion conversion mechanism 53 is configured to be connected to the mode setting member 50 and the movable member 52 in an actuating manner, converting the linear motion of the mode setting member 50 in the left-right direction into the linear motion of the movable member 52 in the front-back direction.

[0044] With the above structure, the movable member 52 moves forward in response to the mode setting member 50 moving from the second position to the first position (i.e., in response to setting to impact-only mode). Accordingly, the movable member 52 moves the transmission sleeve 378 forward, thereby switching the clutch mechanism 374 to the disengaged state. Additionally, the movable member 52 moves rearward in response to the mode setting member 50 moving from the first position to the second position (i.e., in response to setting to rotational impact mode). Accordingly, the movable member 52 moves the transmission sleeve 378 rearward, thereby switching the clutch mechanism 374 to the transmission state.

[0045] The mode detection device 6 is configured to perform electrical detection on the current mode (the mode set (selected) by the mode setting component 50).

[0046] More specifically, such as Figure 2 As shown, the pattern detection device 6 includes a first switch 61 and a second switch 62, which are electrically connected to the controller 20. In this embodiment, the first switch 61 and the second switch 62 are push-button microswitches. The first switch 61 and the second switch 62 are configured to become in an ON state in response to being pressed, and output a predetermined signal (ON signal) to the controller 20.

[0047] In this embodiment, the movable part 52 of the mode switching mechanism 51 presses either the first switch 61 or the second switch 62 according to the mode. More specifically, the movable part 52 has a left arm 521 extending to the left and a right arm 522 extending to the right. The first switch 61 is located in front of the left arm 521, and the second switch 62 is located behind the right arm 522. As described above, the front-rear position of the movable part 52 changes according to the set mode. When the set mode is the impact-only mode, the movable part 52 (left arm 521) presses the first switch 61 from the rear to activate it. When the set mode is the rotational impact mode, the movable part 52 (right arm 522) presses the second switch 62 from the front to activate it. The controller 20 can identify the current mode based on which switch, the first switch 61 or the second switch 62, outputs an activation signal.

[0048] The following describes the structural elements (structure) configured on the handle 15.

[0049] like Figure 3 and Figure 4 As shown, in this embodiment, the handle 15 is mainly equipped with a switch operation component 71, a switch 75, a locking component 8, and a protrusion detection device 9.

[0050] The switch operating component 71 is also referred to as a switch operating lever or trigger. In this embodiment, the switch operating component 71 has a main body 710, a protrusion 72, and a solenoid 73.

[0051] The main body 710 is an elongated hollow member extending substantially vertically along the grip portion 16. The main body 710 is supported on the grip portion 16 in a manner rotatable about a rotation axis set at its lower end. The rotation axis extends substantially horizontally, and the main body 710 is capable of moving substantially forward-backward. The main body 710 has a front wall portion 711, left and right side wall portions 713, and an upper wall portion 715. Furthermore, the front wall portion 711 is exposed to the outside of the grip portion 16 through an opening formed in the front wall portion 165 of the grip portion 16.

[0052] The protrusion 72 is configured to cooperate with the locking member 8, described later, to hold the switch operating member 71 in the ON position. In this embodiment, the protrusion 72 is configured to protrude upwards from the upper surface of the upper wall portion 715. Figure 3 The position shown is the same as the retracted position that does not protrude from the upper surface of the upper wall portion 715. Figure 4 The protrusion 72 moves between the positions shown. More specifically, the protrusion 72 is configured to be integrated with the plunger 733 of the solenoid 73 disposed within the switch operating member 71, and moves in response to the switching of the solenoid 73 on and off.

[0053] The solenoid 73 is disposed within the upper part of the main body 710. The solenoid 73 includes a main body 731, a plunger 733, and a force-applying spring 735. Furthermore, the main body 731 includes a frame (housing) supported on the main body 710 and a coil housed within the frame; in the figures, the frame and coil are simplified and integrally illustrated. The plunger 733 is partially disposed within the coil and is capable of linear movement in the axial direction.

[0054] The solenoid 73 in this embodiment is a pull-type solenoid. A force-applying spring 735 applies force to the plunger 733 in a direction that causes the tip of the plunger 733 to protrude from the body 731. Accordingly, in the off-state (non-operating state, initial state without energization) of the solenoid 73, the tip of the plunger 733 protrudes from the body 731. The solenoid 73 is configured such that the axis of the plunger 733 extends along the length direction (approximately vertical direction) of the switch operating member 71, with the tip of the plunger 733 facing upwards. The protrusion 72 of the switch operating member 71 is formed by the tip of the plunger 733 and an end cap 734 mounted on the tip. Furthermore, the protrusion 72 is positioned substantially at the center of the handle 15 in the left-right direction.

[0055] When solenoid 73 is in the open state, such as Figure 3 As shown, the protrusion 72 protrudes from the upper surface of the upper wall portion 715 through the opening 716 formed in the upper wall portion 715 and is held in the protruding position. On the other hand, as Figure 4As shown, when solenoid 73 is switched on (energized), plunger 733 moves downwards and is pulled into body 731. During the energized state, protrusion 72 is held in the retracted position. When energizing solenoid 73 is stopped, protrusion 72 returns to the protruding position by the force of spring 735. Solenoid 73 and controller 20 (see reference) Figure 1 Electrical connection, controller 20 controls the energization of solenoid 73.

[0056] More specifically, the controller 20, based on the pattern detection device 6 (see reference 6), Figure 2 The controller 20 controls the energization of solenoid 73 based on the detection result (i.e., the current mode). When an on signal is output from the first switch 61, and the current mode is the impact-only mode, the controller 20 does not energize solenoid 73. Therefore, solenoid 73 remains in the off state (initial state), and protrusion 72 remains in the protruding position. On the other hand, when an on signal is output from the second switch 62, and the current mode is the rotating impact mode, the controller 20 energizes solenoid 73. Therefore, solenoid 73 is held in the on state, and protrusion 72 remains in the retracted position.

[0057] The switch 75 is located inside the grip 16 (specifically, directly behind the switch operating member 71). The switch 75 has a body 751 and a plunger 753 that is applied force in a manner that protrudes forward from the body 751.

[0058] The plunger 753 abuts against the front wall 711 of the switch operating member 71 from the rear, positioned below the solenoid 73, applying a forward force to the switch operating member 71. Therefore, in its initial state without any rearward pressing force, the switch operating member 71 is held in its foremost position within its rotational range. Figure 3 (as shown in the image). At this time, switch 75 (body 751) is in the off state. Therefore, the foremost position of switch operating component 71 will also be referred to as the off position below.

[0059] On the other hand, such as Figure 5 and Figure 6 As shown, when the user presses the switch operating member 71 and moves it rearward, the plunger 753 is pressed into the body 751. In response to the switch operating member 71 being positioned in a predetermined position, the switch 75 (body 751) is turned on. The switch 75 remains in the on state while the switch operating member 71 is within its rotational range between the predetermined position and the rearmost position. Therefore, below, any position of the switch operating member 71 between the aforementioned predetermined position and the rearmost position (e.g.) will also be described. Figure 5 The position shown is called the ON position.

[0060] Switch 75 (body 751) is electrically connected to controller 20 and is configured to output a specified signal (on signal) to controller 20 in response to an on state. Controller 20 basically starts driving motor 21 when it recognizes the on signal from switch 75.

[0061] like Figure 2 and Figure 3 As shown, the locking member 8 is supported on the handle 15 in a manner that allows it to move in the left-right direction. More specifically, the locking member 8 includes an elongated body 81. Openings 172 are formed on the left and right sidewalls 171 of the first connecting portion 17 of the handle 15. The body 81 is supported by the sidewalls 171 when inserted into the openings 172 and can slide in the left-right direction. The left end 811 and the right end 812 of the body 81 protrude outward from the openings 172. The user can move the locking member 8 in the left-right direction by pressing the left end 811 or the right end 812 with their finger.

[0062] Additionally, the locking member 8 has a protrusion 83 protruding downward from the lower end of the main body 81. When the switch operating member 71 is in any position between the off and on positions, the lower end of the protrusion 83 is positioned above the upper surface of the upper wall portion 715. Furthermore, when the protrusion 72 of the switch operating member 71 is in the protruding position, the lower end of the protrusion 83 of the locking member 8 is positioned below the upper end of the protrusion 72. The protrusion 83 is positioned to the right of the center in the left-right direction of the main body 81. However, the protrusion 83 may also be positioned to the left of the center in the left-right direction of the main body 81.

[0063] In this embodiment, the locking component 8 is provided with a lock release position and a lock position.

[0064] The lock-out position is set such that the protrusion 83 in the left-right direction does not interfere with the movement path of the protrusion 72 of the switch operating member 71. As described above, the protrusion 72 of the switch operating member 71 is located at the center in the left-right direction of the handle 15. Therefore, in this embodiment, as... Figure 2 and Figure 3 As shown, the locking release position of the locking member 8 is set such that the center of the locking member 8 in the left-right direction is substantially aligned with the center of the handle 15 in the left-right direction. When the locking member 8 is in the locking release position, the protrusion 83 of the locking member 8 is positioned to the right of the protrusion 72 of the switch operating member 71. Therefore, even when the protrusion 72 is in the protruding position, the locking member 8 allows the switch operating member 71 to be in the open position (see reference). Figure 2 , Figure 3 ) and connection position (refer to Figure 5 , Figure 6The protrusion 72 moves between the two positions. In addition, when the protrusion 72 is in the protruding position, the protrusion 72 abuts against the protrusion 83 from the left, thereby preventing the locking member 8 from moving from the unlocked position to the locked position.

[0065] The locking position is set such that, in the left-right direction, the protrusion 83 is positioned on the movement path of the protrusion 72 of the switch operating member 71 from the on position to the off position. Specifically, as... Figure 7 and Figure 8 As shown, the locking position is set such that the center of the protrusion 83 is substantially aligned with the center of the handle 15 in the left-right direction. Alternatively, the locking position can be described as the position where the center of the locking member 8 in the left-right direction is offset to the left from the center of the handle 15 in the left-right direction. When the locking member 8 is in the locked position and the protrusion 72 is in the protruding position, the protrusion 83 abuts against the protrusion 72 of the switch operating member 71, which is in the ON position, from the front, thereby preventing the switch operating member 71 from moving to the OFF position (remaining in the ON position).

[0066] In addition, such as Figure 3 As shown, a retaining member 86 is disposed on the handle 15, which is configured to hold the locking member 8 in either the unlocked or locked position. More specifically, the retaining member 86 is a leaf spring, disposed above the locking member 8 within the first connecting portion 17. The retaining member 86 has a rearwardly projecting protrusion, the details of which are omitted. On the other hand, the locking member 8 has a spring receiving portion 85 that projects upward from the body 81 behind the retaining member 86. The spring receiving portion 85 has two recesses that engage with the protrusion of the retaining member 86 when the locking member 8 is in the unlocked position and when it is in the locked position, respectively. The retaining member 86 holds the locking member 8 in either the unlocked or locked position by engaging with either of the recesses.

[0067] As described above, the protrusion 72 of the switch operating member 71 is held in the protruding position when the current mode is the impact-only mode, and held in the retracted position when the current mode is the rotation impact mode. Therefore, the locking member 8 can hold the switch operating member 71 in the ON position only when the mode is set to impact-only mode.

[0068] The protrusion detection device 9 is provided to detect that the protrusion 72 of the switch operating component 71 is in a protruding position. More specifically, as... Figure 3 and Figure 8As shown, the protrusion detection device 9 of this embodiment includes a substrate 91 and a Hall sensor 93 mounted on the substrate 91 and capable of detecting magnets. The substrate 91 is fixed to a locking member 8. More specifically, the locking member 8 has an extension 89 protruding rearward from the main body 81. The extension 89 is positioned rearward and above the protrusion 83. The substrate 91 is mounted on the extension 89 such that the Hall sensor 93 faces downward.

[0069] In this embodiment, the magnet 95, which is the object of detection by the Hall sensor 93, is mounted on the protruding end (end cap 734) of the protrusion 72 of the switch operating member 71. Therefore, the position of the Hall sensor 93 is set such that, when the locking member 8 is in the locked position, the Hall sensor 93 is substantially positioned at the center in the left-right direction of the handle 15. The magnet 95 is within the detection range of the Hall sensor 93 only when the switch operating member 71 is in the ON position, the protrusion 72 is in the POV position, and the locking member 8 is in the locked position, and the Hall sensor 93 detects the magnet 95.

[0070] Thus, the protrusion detection device 9 detects that the protrusion 72 of the switch operating component 71 is in the protruding position by detecting the magnet 95 mounted on the protrusion 72. The protrusion detection device 9 is electrically connected to the controller 20 and is configured to output a predetermined signal (on signal) to the controller 20 based on the detection of the magnet 95. The detection result detected by the protrusion detection device 9 is used for the control of the motor 21, as will be described in detail later.

[0071] The operation of the hammer drill 1A (especially the control performed by the controller 20 (control circuit)) will be described below.

[0072] The user first moves the mode setting component 50 appropriately according to the actual processing operation to set the mode of the hammer drill 1A.

[0073] When the hammer drill 1A is in impact-only mode, the controller 20 recognizes the on signal from the first switch 61 of the mode detection device 6, and therefore does not energize the solenoid 73. Therefore, as... Figure 3 As shown, protrusion 72 is held in the protruding position.

[0074] like Figure 5 As shown, when the user holds the switch operating member 71 together with the handle 16 and presses the switch operating member 71 to move it rearward to the ON position, the switch 75 is OFF. The controller 20 drives the motor 21 during the period when both the first switch 61 and the switch 75 are ON. Figure 7 and Figure 8As shown, when the switch operating component 71 is in the ON position, the switch operating component 71 is held in the ON position when the user moves the locking component 8 from the lock-out position to the lock position. Therefore, even if the user does not continue to press the switch operating component 71, the controller 20 continues to drive the motor 21.

[0075] When the user returns the locking component 8 to the unlocked position and the pressing of the switch operating component 71 is also released, the switch operating component 71 returns to the off position. In response to the switch 75 being turned off, the controller 20 stops the drive of the motor 21.

[0076] When the hammer drill 1A is in rotary impact mode, the controller 20 recognizes the energizing signal from the second switch 62 of the mode detection device 6, causing the solenoid 73 to be in the energized state. Therefore, as Figure 4 As shown, protrusion 72 moves from the protruding position to the retracted position and is held thereafter.

[0077] like Figure 9 As shown, when the user presses the switch operating member 71, causing it to move backward to the ON position, the switch 75 is OFF. When the second switch 62 is ON, the controller 20 starts driving the motor 21 in response to the OFF of switch 75. Furthermore, even if the user moves the locking member 8 to the locked position during the operation of the motor 21, the locking member 8 cannot lock the switch operating member 71 because the protrusion 72 is in the retracted position. In response to the user releasing the pressure on the switch operating member 71, the switch 75 is OFF, and the controller 20 stops driving the motor 21.

[0078] Additionally, in the rotary impact mode, the controller 20 monitors whether an on signal is output from the protrusion detection device 9 during the driving of the motor 21. As described above, the protrusion detection device 9 outputs the on signal when the switch operating member 71 is in the on position, the protrusion 72 is in the protruding position, and the locking member 8 is in the locked position (see reference). Figure 8 ).

[0079] In the rotating impact mode, although the protrusion 72 is positioned in the retracted position, the solenoid 73 may malfunction for some reason, causing the protrusion 72 to remain in the protruding position. In this state, when the user presses the switch operating member 71, causing the locking member 8 to move to the locked position, the switch operating member 71 is held in the on position, and the rotation of the tip tool 300 continues. During the rotation, the tip tool 300 may be accidentally locked, and the tool body 10 may rotate excessively, so it is not preferable to hold the switch operating member 71 in the on position. Therefore, in this embodiment, when the controller 20 detects the on signal from the protrusion detection device 9 during the driving of the motor 21, it immediately stops the driving of the motor 21. Accordingly, even if the tip tool 300 is locked, excessive rotation of the tool body 10 can be avoided, thus improving safety.

[0080] As explained above, in the hammer drill 1A of this embodiment, the switch operating member 71 can be held in the ON position by the abutment 83 of the locking member 8 against the protrusion 72 of the switch operating member 71. The protrusion 72 is integrated with the plunger 733 of the solenoid 73, thus moving between the protruding position and the retracted position in response to the movement of the solenoid 73. The switch 75 is disposed within the gripping portion 16, while the solenoid 73 is housed within the body 710 of the switch operating member 71. That is, in this embodiment, not the gripping portion 16, but the interior of the body 710 of the switch operating member 71 is utilized efficiently as a housing space for the solenoid 73, which moves the protrusion 72 between the protruding position and the retracted position according to the mode. Therefore, a compact locking structure capable of operating according to the mode is achieved.

[0081] In particular, in this embodiment, the protrusion 83 of the locking member 8 abuts against the front region of the protrusion 72 of the switch operating member 71, which is located in a protruding position, thereby holding the switch operating member 71 in the ON position. Therefore, the user can move the locking member 8 to the locked position and hold the switch operating member 71 in the ON position simply by moving the switch operating member 71 rearward so that the protrusion 72 is positioned any position rearward than the protrusion 83. Therefore, precise alignment of the protrusions 72 and 83 is not required, and this method is more convenient than structures that lock the switch operating member 71 by the engagement of a recess and a protrusion.

[0082] Furthermore, in this embodiment, the solenoid 73 is a pull-type solenoid. Therefore, when the locking member 8 abuts against the protrusion 72 in the protruding position to hold the switch operating member 71 in the ON position, the solenoid 73 is in the OFF state. Conversely, when the solenoid 73 is in the ON state, the protrusion 72 is in the retracted position. Thus, in this embodiment, the plunger 733 of the solenoid 73 only needs to bear the movement of the protrusion 72, and in the ON state, there is no extra load required to hold the switch operating member 71 in the ON position. Therefore, compared to the case of using a push-type solenoid, the durability of the solenoid 73 can be improved.

[0083] <Second Implementation Method> Below, refer to Figure 10 and Figure 11 The hammer drill 1B according to the second embodiment will be described below. Furthermore, the connection method between the tool body 10 and the handle 15 in the hammer drill 1B of the second embodiment differs from that of the hammer drill 1A of the first embodiment, but other structures are substantially the same as those in the hammer drill 1A. Therefore, the same reference numerals will be used to label structures substantially the same as those in the hammer drill 1A below, and descriptions will be simplified or omitted.

[0084] like Figure 10 and Figure 11 As shown, in the hammer drill 1B of this embodiment, the tool body 10 and the handle 15 are connected in a way that allows them to move relative to each other via elastic members 191 and 193.

[0085] More specifically, two elastic members 191 are disposed between the upper rear end of the tool body 10 (specifically, the rear wall 115 of the drive mechanism housing 11) and the front end of the first connecting portion 17 of the handle 15 (specifically, the front wall 175 of the first connecting portion 17). Additionally, two elastic members 193 are disposed between the lower rear end of the tool body 10 (specifically, the rear wall 135 of the motor housing 13) and the front end of the second connecting portion 18 of the handle 15 (specifically, the front wall 185 of the second connecting portion 18).

[0086] In this embodiment, the elastic components 191 and 193 are compression coil springs. However, other types of mechanical springs (e.g., torsion springs, disc springs), rubber, or elastic synthetic resins can also be used. The elastic components 191 and 193 apply forces to the tool body 10 and the handle 15 in a direction that moves away from each other in the front-back direction, respectively. With such an elastic connection structure, the transmission of vibration from the tool body 10 to the handle 15 can be suppressed.

[0087] Similar to the first embodiment, in the hammer drill 1B, the handle 15 is also equipped with a switch operation member 71 that houses the solenoid 73, a switch 75, a locking member 8, and a protrusion detection device 9. Therefore, as described in the first embodiment, a compact locking structure that can operate according to a mode is realized by utilizing the space within the main body 710 of the switch operation member 71.

[0088] In the prior art, there is a known hammer drill that can selectively restrict the movement of the locking member of the switch operating lever according to a set mode by using a movable member that extends rearward from the tool body and moves in the forward-backward direction according to the action of the mode switching mechanism. Specifically, such a movable member interferes with the locking member in the mode where the top tool is driven to rotate, preventing the locking member from moving to the locked position. However, in this embodiment, the first connecting portion 17, where the locking member 8 is disposed, is connected to the tool body 10 via an elastic member 191. In the hammer drill 1B with such a vibration-damping structure, if a movable member as in the prior art is used, the movable member may not be properly positioned relative to the locking member 8 due to changes in the positional relationship between the tool body 10 and the handle 15. Therefore, by using the mode detection device 6 (see reference 6), the movement of the locking member may be restricted. Figure 2 It is useful to perform electrical testing according to the set mode and control the solenoid 73 according to the mode so that the switch operating component 71 can or cannot be kept in the on position.

[0089] Furthermore, the above embodiments are merely illustrative, and the impact tools involved in this invention are not limited to the illustrated hammer drills 1A and 1B. For example, the modifications illustrated below can be applied. In addition, at least one of these modifications can be combined with at least one of the features described in the embodiments, including the hammer drills 1A and 1B, and the features described in each technical solution.

[0090] In addition to the impact-only mode and the rotary impact mode, or alternatively to the modes described above, the hammer drill of this invention may also have other modes (e.g., a rotary mode that only performs rotational motion, a drive-disabled mode that does not drive the tip tool, etc.). For example, the hammer drill may have an impact-only mode, a rotary impact mode, and a rotary mode. Furthermore, the operation of the hammer drill in the rotary mode is substantially the same as the operation in the rotary impact mode described in the above embodiments. In addition, the mode switching mechanism and mode setting component for changing the mode are not limited to the examples in the above embodiments, and any known structure may be used.

[0091] The pattern detection device involved in this invention only needs to be able to electrically detect whether the current mode is a specific mode, and can have any structure. For example, in hammer drills 1A and 1B that only have an impact mode and a rotary impact mode (or another mode), the pattern detection device 6 can also have only one of the first switch 61 and the second switch 62. In addition, the pattern detection device can detect the operation of any component in the mode switching mechanism, or it can detect the operation of the mode setting component. Alternatively, it can be configured to detect the mode set via an input device (e.g., a push-button switch, a slide switch, or a touch screen).

[0092] The structure of the tool body 10 and / or handle 15 can be modified appropriately. For example, a tool body with a shape other than an L-shape when viewed from the side can also be used. Alternatively, instead of having both ends connected to the tool body 10, a handle can be used that has only one end connected to the tool body in a cantilever beam shape.

[0093] The structure and / or configuration of the motor 21 and drive mechanism 3 within the tool body 10 can be appropriately modified, either correspondingly to or unrelated to changes in the tool body 10. For example, a brushless motor can be used instead of the motor 21. The motor can also be driven by power supplied from a rechargeable battery. The motor can be configured such that the rotation axis RX is obliquely intersecting the drive axis DX, or it can be configured parallel to the drive axis DX. Instead of the motion conversion mechanism 31 of the drive mechanism 3, a known operation conversion mechanism can be used, which is configured to reciprocate the piston using components that oscillate in response to the rotation of the rotating body (e.g., swash bearing, wobble plate / bearing).

[0094] The switch operating component involved in this invention only needs to have a main body, a protrusion, and a solenoid housed in the main body, and its structure (e.g., shape, constituent parts) and / or support method can be appropriately modified.

[0095] For example, the switch operating component can be forced to the open position by a force-applying spring that is separate from the switch plunger. The protrusion of the switch operating component can be formed solely by the tip of the solenoid plunger. Furthermore, the protruding end of the protrusion can slightly protrude from the switch operating component, provided that its retracted position does not interfere with the locking component positioned in the locked position.

[0096] Furthermore, in the above embodiment, the solenoid 73 is a pull-type solenoid, but the use of a push-type solenoid is not excluded. When a push-type solenoid is used, the protrusion of the switch operating component is held in a retracted position when the solenoid is in the open state, and in a protruding position when the solenoid is in the closed state. In this modified example, if the controller 20 determines, based on the detection result of the mode detection device 6, that the current mode is a mode in which the tip tool is driven to rotate (rotational impact mode or rotation only mode), it keeps the solenoid in the open state. Conversely, if the controller 20 determines that the current mode is an impact only mode, it closes the solenoid.

[0097] The locking member involved in this invention can be appropriately modified in structure and / or configuration as long as it can hold the switch operating member in the ON position. For example, the locking member may have a protrusion extending in the lateral direction that can abut against the protrusion of the switch operating member. The locking member may, for example, be configured to be movable in the vertical direction or rotatable about an axis.

[0098] Alternatively, instead of retaining member 86, a retaining member (e.g., a spring) configured to apply force to and hold the locking member 8 towards the unlocked position can be used. In this case, the locking member 8 can be held in the locked position by the switch operating member 71 which applies force to the open position. Alternatively, retaining member 86 can be changed to a member that engages with the locking member 8 to lock the locking member 8, or it can be omitted.

[0099] The protrusion detection device 9 can be modified or omitted as appropriate. For example, the mounting position of the Hall sensor 93 or the magnet 95 can be changed so that the magnet 95 can be detected when the switch operating member 71 is in the off position and the protrusion 72 is in the protruding position, regardless of the position of the locking member 8. In this modified example, the controller 20 can be configured such that when the current mode is the rotation impact mode (or the rotation only mode) and the protrusion 72 is detected to be in the protruding position, the drive of the motor 21 is not started. In addition, other types of magnetic field detection sensors, optical sensors, or contact switches can be used instead of the Hall sensor 93.

[0100] In the above embodiment, the control circuit of the controller 20 controls the operation of the solenoid 73 and the motor 21, but multiple control circuits can also control the operation of the solenoid 73 and the motor 21 respectively.

[0101] In view of the spirit of the present invention and the above embodiments, the following methods are constructed. At least one of the following methods can be used in combination with the features of the embodiments and their variations, or at least one of the features described in the various technical solutions. [Method 1] The protrusion includes the tip of the plunger. [Method 2] The solenoid has a force-applying component that applies force to the plunger toward the protruding position. [Method 3] The hammer drill has a control device configured to control the movement of the solenoid based on the detection results of the pattern detection device. [Method 4] The control device is configured to control the drive of the motor based at least on the state of the switch. [Method 5] The control device is configured to control the drive of the motor based on the detection results of the pattern detection device and the detection results of the protrusion detection device. [Method 6] The hammer drill also has a force-applying component that applies force to the switch operating component toward the disconnected position. The plunger 753 of the switch 75 in the above embodiment is a non-limiting example of the "force-applying component" of this method. [Method 7] The hammer drill has a retaining member that can hold the locking member in the locked position and the unlocked position, respectively. [Method 8] The locking component is disposed within the upper end of the handle. The upper end of the handle is connected to the tool body via at least one elastic component.

Claims

1. A hammer drill configured to selectively operate in multiple modes, including a first mode of driving a tip tool in a linear fashion along a drive axis only, and a second mode of driving the tip tool to rotate at least about the drive axis, characterized in that, It includes a switch, a motor, a switch operating component, a locking component, and a mode detection device, wherein, The motor is configured to be driven when the switch is in the ON state; The switch operating component has a main body and a protrusion. The main body is normally held in the off position, which puts the switch in the off state, and can be moved to the on position, which puts the switch in the on state, in response to manual operation by the user. The protrusion can move between a protruding position and a retracted position, wherein the protruding position is the position where the protrusion protrudes from the main body, and the retracted position is the position where the protrusion does not protrude from the main body, or the amount of protrusion from the main body is smaller than the amount of protrusion when it is in the protruding position. The locking member is movable between a lock-out position and a lock position in response to a manual operation by the user, wherein the lock-out position is a position in which the locking member allows the switch operating member to move between the on position and the off position, and the lock position is a position in which the locking member abuts against the protrusion located at the protruding position, holding the switch operating member in the on position; The mode detection device is configured to electrically detect the current mode of the hammer drill. The main body of the switch operating component houses a solenoid configured to operate based on the detection result of the pattern detection device. The protrusion is integrated with the plunger of the solenoid and is configured to be located in the protruding position when the current mode is the first mode and in the retracted position when the current mode is the second mode.

2. The hammer drill according to claim 1, characterized in that, The solenoid is a pull-type solenoid. The protrusion is configured such that it is located in the protruding position when the solenoid is in the disconnected state, and moves to the retracted position when the solenoid is in the connected state.

3. The hammer drill according to claim 2, characterized in that, It also includes a protrusion detection device configured to detect when the protrusion is located at the protruding position. The motor is configured such that, when the current mode is the second mode, it is prohibited from being driven if the protrusion is detected by the protrusion detection device to be located at the protruding position.

4. The hammer drill according to claim 3, characterized in that, A magnet is disposed at the protruding end of the protrusion that extends from the body. The protrusion detection device is configured to detect the magnet when the protrusion is in the protruding position.

5. The hammer drill according to any one of claims 1 to 4, characterized in that, The protrusion is movable in a direction that intersects the direction of movement of the main body of the switch operating component.

6. The hammer drill according to any one of claims 1 to 5, characterized in that, The protrusion is capable of moving in a direction that intersects the moving direction of the locking component.

7. The hammer drill according to claim 5 or 6, characterized in that, The drive axis defines the forward and backward direction of the hammer drill. It also has a gripping part that extends in a vertical direction orthogonal to the drive axis. The main body of the switch operating component is supported on the gripping part in such a way that it can move substantially along the front-back direction between the off position and the on position, which is located behind the off position. The protrusion is substantially movable along the vertical direction at the upper end of the switch operating component. The locking member is configured such that, in the locked position, it abuts against the front region of the protrusion disposed in the protruding position, thereby preventing the switch operating member from moving from the on position to the off position.

8. The hammer drill according to claim 7, characterized in that, The locking component is capable of moving in a left-right direction orthogonal to the front-back direction and the up-down direction.

9. The hammer drill according to any one of claims 1 to 8, characterized in that, The drive axis defines the forward and backward direction of the hammer drill. It also has a gripping part that extends in a vertical direction orthogonal to the drive axis. The switch is located inside the grip portion. The switch operating component is supported on the gripping part in a manner that allows it to move between the off position and the on position, which is located behind the off position. The solenoid is positioned in front of the switch in the front-back direction.

10. The hammer drill according to any one of claims 1 to 9, characterized in that, It also has at least a tool body that houses the motor, and a handle including a gripping part. The switch operating component and the locking component are supported on the handle. The tool body and the handle are connected via at least one elastic component.

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