Hammer drill

Abstract

To provide improvement related to a lock structure of an operation member of a switch for driving a motor.SOLUTION: A hammer drill is selectively operated in a plurality of modes including a first mode in which a tip tool is driven only linearly and a second mode in which the tip tool is at least rotationally driven. The hammer drill includes: a switch; a motor; a switch operation member; a lock member; and a mode detection device. The switch operation member has a body and a projection movable between a projection position and a retreat position. A solenoid which is operated on the basis of a detection result of the mode detection device is stored in the body. The lock member is movable between a lock release position and a lock position which abuts on a projection at the projection position and holds the switch operation member at an ON position. The projection is integrated with a plunger of the solenoid. When a present mode is the first mode, the projection is arranged at the projection position. When the present mode is the second mode, the projection is arranged at the retreat position.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a hammer drill.

Background Art

[0002] A hammer drill has a mode of driving a tip tool linearly only along a drive shaft and a mode of driving the tip tool to rotate at least around the drive shaft. In the mode of driving the tip tool linearly only along the drive shaft, generally, chipping work and grooving work are performed. In order to eliminate the annoyance of the user continuously pressing an operation member during such work, a lock structure for holding the operation member of a switch in the on position is known. For example, the hammer drill disclosed in Patent Document 1 includes a lock unit including an actuator element that operates according to a mode and a lock element that is moved by the actuator element. The lock element engages with an engagement recess of a guide element provided in the operation member of the switch to hold the operation member in the on position.

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 of Patent Document 1, a complicated lock structure is arranged in the limited space within the grip portion. Therefore, there is room for improvement in this lock structure.

[0005] In view of the above situation, one non-limiting object of the present disclosure is to provide an improvement in the lock structure of an operation member of a switch for motor drive.

Means for Solving the Problems

[0006] According to one non-limiting aspect of the present disclosure, a hammer drill is provided which is configured to operate selectively in a plurality of modes, including a first mode in which the tool tip is driven only linearly along a drive axis, and a second mode in which the tool tip is driven rotationally at least about a drive axis. The second mode may be a mode in which the tool tip is driven rotationally only, or a mode in which the tool tip is driven rotationally and linearly at the same time.

[0007] The hammer drill comprises a switch, a motor, a switch operating member, a locking member, and a mode detection device. The motor is configured to be driven when the switch is in the ON position. The switch operating member comprises a body and a projection. The body is normally held in the OFF position and is configured to move to the ON position in response to manual operation by the user. The body is configured to turn the switch OFF in the OFF position and to turn the switch ON in the ON position. The projection is movable between a protruding position and a retracted position. In the protruding position, the projection protrudes from the body. In the retracted position, the projection does not protrude from the body. Alternatively, the amount of protrusion from the body when in the retracted position is less than the amount of protrusion when in the protruding position. The locking member is movable between an unlocked position and a locked position in response to manual operation by the user. In the unlocked position, the locking member is configured to allow movement of the switch operating member between the ON position and the OFF position. The locking member is configured to contact a projection in the protruding position when locked, holding the switch operating member 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 body of the switch operating member houses a solenoid configured to operate based on the detection result of the mode detection device. A solenoid is a well-known electrical component configured to convert electrical energy into mechanical energy of linear motion by utilizing the magnetic field generated by passing an electric current through a coil, and is also called an actuator or linear actuator. The projection is integrated with the plunger of the solenoid. The projection is configured to be in a protruding position when the current mode is the first mode, and in a retracted position when the current mode is the second mode.

[0009] In this embodiment of the hammer drill, a solenoid is housed within the body of the switch operating member. The projection of the switch operating member is integrated with the plunger of the solenoid, and moves between a protruding position and a retracted position in accordance with the operation of the solenoid. The solenoid operates based on the detection result of the mode detection device, that is, the current mode, and in the first mode, it is possible to hold the switch operating member in the ON position, while in the second mode, it is impossible to hold the switch operating member in the ON position. Thus, according to this embodiment, the inside of the body of the switch operating member is effectively utilized as a space for housing the solenoid, and a compact locking structure that can operate according to the mode is realized. [Brief explanation of the drawing]

[0010] [Figure 1] This is a cross-sectional view of a hammer drill with the switch operating member in the off position, the projection in the protruding position, and the locking member in the unlocked position. [Figure 2] This is a cross-sectional view along line II-II in Figure 1. [Figure 3] This is a magnified section of Figure 1. [Figure 4] This is a cross-sectional view corresponding to Figure 3, showing the projection in its retracted position. [Figure 5] This is a cross-sectional view corresponding to Figure 3, showing the switch operating member in the ON position. [Figure 6] This is a cross-sectional view corresponding to Figure 2, showing the switch operating member in the ON position. [Figure 7] This is a cross-sectional view corresponding to Figure 2, showing the state where the switch operating member is in the ON position and the locking member is in the locked position. [Figure 8] This is a cross-sectional view corresponding to Figure 3, showing the state where the switch operating member is in the ON position and the locking member is in the locked position. [Figure 9] This is a cross-sectional view corresponding to Figure 3, showing the switch operating member in the ON position and the projection in the retracted position. [Figure 10] This is a partial cross-sectional view of another hammer drill. [Figure 11] Figure 10 is a cross-sectional view along the line XI-XI. [Modes for carrying out the invention]

[0011] In one non-limiting embodiment of this disclosure, the solenoid may be a pull-type solenoid. The projection may be configured to be in a protruding position when the solenoid is in the off state and to move to a retracted position when the solenoid is turned on. According to this embodiment, the solenoid is in the off state when the locking member contacts the projection in the protruding position to hold the switch operating member in the on position. Also, when the solenoid is in the on state, the projection is in the retracted position. In this way, the plunger of the solenoid only needs to be responsible for the movement of the projection and does not require an extra load to hold the switch operating member in the on position, thus improving the durability of the solenoid.

[0012] In addition to or instead of the above-described embodiment, the hammer drill may further include a protrusion detection device configured to detect that the protrusion is in the protruding position. The motor may be configured such that when it is detected by the protrusion detection device that the protrusion is in the protruding position while the current mode is the second mode, the driving thereof is prohibited. Note that, specifically, prohibiting the driving means, for example, stopping the driving and not starting the driving. According to this embodiment, in the second mode in which the tip tool is rotationally driven, even if the solenoid does not operate due to some cause and the switch operation member can be held in the on position, the driving of the motor is prohibited. Therefore, the safety of the hammer drill is improved.

[0013] In addition to or instead of the above-described embodiment, a magnet may be disposed at the protruding end of the protrusion from the main body. The protrusion detection device may be configured to detect the magnet when the protrusion is in the protruding position. The protrusion detection device may include, for example, a magnetic field detection type sensor (for example, a Hall sensor). According to this embodiment, a protrusion detection device with a reasonable configuration is realized.

[0014] In addition to or instead of the above-described embodiment, the protrusion may be movable in a direction intersecting the moving direction of the main body of the switch operation member. According to this embodiment, compared with the case where the protrusion is movable in the same direction as the main body, an increase in size in the moving direction of the main body can be avoided.

[0015] In addition to or instead of the above-described embodiment, the protrusion may be movable in a direction intersecting the moving direction of the lock member. According to this embodiment, compared with the case where the protrusion is movable in the same direction as the lock member, an increase in size in the moving direction of the lock member can be avoided.

[0016] In addition to or instead of the above-described embodiment, the drive shaft may define the front-rear direction of the hammer drill. The hammer drill may further include a gripping portion extending in the vertical direction orthogonal to the drive shaft. The main body of the switch operating member may be supported by the gripping portion so as to be substantially movable in the front-rear direction between an off position and an on position behind the off position. The protrusion may be substantially movable in the vertical direction at the upper end portion of the switch operating member. The lock member may be configured to contact a front region of the protrusion disposed at the protruding position in the lock position and prevent the switch operating member from moving from the on position to the off position. According to this embodiment, a simple and reasonable configuration capable of holding the switch operating member in the on position is realized.

[0017] In addition to or instead of the above-described embodiment, the lock member may be movable in the left-right direction orthogonal to the front-rear direction and the vertical direction. According to this embodiment, since the moving directions of the switch operating member and the lock member, that is, the operating directions are different, it is possible to prevent the user from accidentally operating the other member when operating either one of the members.

[0018] In addition to or instead of the above-described embodiment, the drive shaft may define the front-rear direction of the hammer drill. The hammer drill may further include a gripping portion extending in the vertical direction orthogonal to the drive shaft. The switch may be disposed inside the gripping portion. The switch operating member may be supported by the gripping portion so as to be movable between an off position and an on position behind the off position. The solenoid may be in front of the switch in the front-rear direction. According to this embodiment, by using the space inside the gripping portion and the space inside the switch operating member, the switch and the solenoid can be reasonably arranged adjacent to each other.

[0019] In addition to, or in place of, the above embodiment, the hammer drill may further include a tool body housing at least a motor and a handle including a gripping portion. The switch operating member and the locking member may be supported by the handle. The tool body and the handle may be connected via at least one elastic member. According to this embodiment, it is possible to suppress the transmission of vibrations of the tool body to the gripping portion.

[0020] Hereinafter, with reference to the drawings, representative and non-limiting embodiments of this disclosure will be described in detail.

[0021] <First Embodiment> The hammer drill 1A according to the first embodiment will be described below with reference to Figures 1 to 9. First, the general configuration of the hammer drill 1A will be described. The hammer drill 1A is an electric power tool capable of striking and rotating operations. The striking operation is the operation of striking the tip tool 300, which is detachably held in the tool holder 30, and driving it linearly along the long axis (drive axis DX) of the tool holder 30. The rotating operation is the operation of rotating the tip tool 300 around the drive axis DX.

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

[0023] The tool body 10 may also be referred to as the main body housing. The tool body 10 in this embodiment includes a drive mechanism housing 11 and a motor housing 13. The drive mechanism housing 11 is mainly the part that houses the tool holder 30 and the drive mechanism 3, and extends along the drive shaft DX. The tool holder 30 is located within one end of the drive mechanism housing 11 in the longitudinal direction. The motor housing 13 is mainly the part that houses the motor 21, and protrudes from one end of the drive mechanism housing 11 in a direction that intersects (more specifically, perpendicular to) the drive shaft DX. In other words, the tool body 10 as a whole is formed in an L shape.

[0024] The handle 15 is a U-shaped hollow member as a whole, and includes a gripping portion 16 that is grasped by the user, a first connecting portion 17, and a second connecting portion 18. The gripping portion 16 extends in a direction intersecting the drive shaft DX (more specifically, in a substantially orthogonal direction). The first connecting portion 17 is the portion that connects one end of the gripping portion 16 in the longitudinal direction to the drive mechanism housing portion 11. The second connecting portion 18 is the portion that connects the other end of the gripping portion 16 in the longitudinal direction to the motor housing portion 13. The gripping portion 16 is provided with a switch operating member 71 that is pressed by the user. A switch 75 is housed inside the gripping portion 16. When the switch 75 is turned on in response to the press operation of the switch operating member 71, the motor 21 is started to drive, and the drive mechanism 3 causes the tip tool 300 to reciprocate and / or rotate.

[0025] The following describes the detailed configuration of the hammer drill 1A. For convenience, in the following description, the direction of extension of the drive shaft DX is defined as the front-rear direction of the hammer drill 1A. In the front-rear direction, the tip side of the tool holder 30 (the side into which the tip tool 300 is inserted) is defined as the front side of the hammer drill 1A, and the opposite side is defined as the rear side. Furthermore, the direction perpendicular to the drive shaft DX and corresponding to the direction of extension of the gripping portion 16 is defined as the up-down direction of the hammer drill 1A. In the up-down direction, the side of the first connecting portion 17 is defined as the upper side, and the opposite side (the side of the second connecting portion 18) is defined as the lower side. In addition, the direction perpendicular to the front-rear direction and the up-down direction is defined as the left-right direction.

[0026] First, the elements (configurations) arranged within the tool body 10 (motor housing 13 and drive mechanism housing 11) will be explained in order.

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

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

[0029] The controller 20 is located behind the motor 21 within the motor housing 13. The controller 20 is a control device configured to control the operation of the hammer drill 1A. Although detailed illustrations are omitted, the controller 20 in this embodiment includes a circuit board and a control circuit mounted on the circuit board. The operation control of the hammer drill 1A by the controller 20 will be described later.

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

[0031] The tool holder 30 is a long, cylindrical member having a long axis. The tool holder 30 is configured to removably receive a portion of the tip tool 300, allowing the tip tool 300 to slide linearly in the direction of the long axis and to be held in a position where it cannot rotate relative to the tool holder 30. The tool holder 30 is also supported by the tool body 10 (drive mechanism housing 11) so as to be rotatable around the long axis. Therefore, the tip tool 300 is rotatable integrally with the tool holder 30 around the 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 operably connected to the motor 21 (motor shaft 215) and is driven by the power of the motor 21. The drive mechanism 3 in this embodiment includes a motion conversion mechanism 31 and a striking element 33 for striking motion, and a rotation transmission mechanism 37 for rotational motion.

[0033] The motion conversion mechanism 31 is operably connected to the motor 21 and is configured to convert the rotational motion of the motor shaft 215 into linear motion along the drive shaft DX for driving the tip tool 300 (specifically, linear motion of the piston 315). In this embodiment, a crank mechanism with a well-known configuration 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 operably connected to the motor shaft 215 and rotated by the motor shaft 215. The crankshaft 311 has an eccentric pin. The connecting rod 313 is operably 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 located coaxially with the tool holder 30. In response to the drive of the motor 21, the piston 315 reciprocates within the cylinder 32 along the drive shaft DX.

[0035] The striking element 33 is configured to move linearly in response to the reciprocating motion of the piston 315 and strike the tool tip 300, thereby driving the tool tip 300 linearly along the drive axis DX. In this embodiment, the striking element 33 includes a striker 34 and an impact bolt 35. The striker 34 is slidably positioned within the cylinder 32. The impact bolt 35 is slidably positioned in front of the striker 34 within the tool holder 30. An air chamber is formed between the striker 34 and the piston 315. Pressure fluctuations generated within the air chamber as the piston 315 reciprocates cause the striker 34 to reciprocate along the drive axis DX. When the striker 34 collides with the impact bolt 35, the impact bolt 35 transmits kinetic energy to the tool tip 300.

[0036] The rotation transmission mechanism 37 is operably connected to the motor shaft 215 and is configured to transmit the rotation of the motor shaft 215 to the tool holder 30. The rotation transmission mechanism 37 is a gear reduction mechanism. Briefly, the rotation transmission mechanism 37 includes a small bevel gear 372, a large bevel gear 376, and a clutch mechanism 374.

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

[0038] The clutch mechanism 374 includes a gear sleeve 375 and a driving sleeve 378. The gear sleeve 375 is rotatably supported relative to the tool holder 30 around the rear end of the tool holder 30. The large bevel gear 376 is integrally provided with the gear sleeve 375. The driving sleeve 378 is spline-coupled to the outer circumference of the tool holder 30 in front of the gear sleeve 375, and is immobile relative to the tool holder 30, but movable in the front-rear direction.

[0039] When the rear end of the driving sleeve 378 is engaged with the front end of the gear sleeve 375, the clutch mechanism 374 is in a transmission state. Therefore, when the motor 21 is driven, the rotation transmission mechanism 374 rotates the tool holder 30, and consequently the tip tool 300 held in the tool holder 30, around the drive shaft DX. On the other hand, when the rear end of the driving sleeve 378 is separated forward from the front end of the gear sleeve 375, the clutch mechanism 374 is in a disengaged state. Therefore, rotation is not transmitted from the gear sleeve 375 to the driving sleeve 378. In other words, even when the motor 21 is driven, the tool holder 30 and the tip tool 300 are not rotated around the drive shaft DX.

[0040] The mode switching mechanism 51 is configured to switch the mode (also called the operating mode) of the hammer drill 1A. More specifically, the drive mechanism 3 of this embodiment has two modes: a striking-only mode and a rotary striking mode, and is configured to operate selectively in either mode. In the striking-only mode, the clutch mechanism 374 is in a disengaged state, and only the striking action is performed. In the rotary striking mode, the clutch mechanism 374 is in a transmission state, and the striking action and rotational 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 striking-only mode and the rotary striking mode by switching the state of the clutch mechanism 374 between a disengaged state and a transmission state.

[0041] More specifically, the mode switching mechanism 51 is operably connected to the mode setting member 50 and the driving sleeve 378 of the clutch mechanism 374. The mode switching mechanism 51 is configured to move the driving sleeve 378 in the forward and backward directions in response to the movement of the mode setting member 50.

[0042] The mode setting member 50 is a member that is manually operated by the user to set (select) a mode (switch between impact-only mode and rotary impact mode). In this embodiment, the mode setting member 50 is a slide lever that is supported at the rear end of the tool body 10 so as to be slidable in the left-right direction. The mode setting member 50 is movable between a first position corresponding to impact-only mode and a second position corresponding to 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 positioned above the motion conversion mechanism 31 (crank mechanism) of the drive mechanism 3. The movable member 52 is operably connected to the driving sleeve 378 via a plurality of connecting members and is linearly movable in the front-rear direction relative to the tool holder 30. The motion conversion mechanism 53 is operably connected to the mode setting member 50 and the movable member 52 and is configured to convert the left-right linear motion of the mode setting member 50 into the front-rear linear motion of the movable member 52.

[0044] With the above configuration, 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 the setting of the strike-only mode). This causes the movable member 52 to move the driving sleeve 378 forward and switch the clutch mechanism 374 to the disengaged state. Also, the movable member 52 moves backward in response to the mode setting member 50 moving from the first position to the second position (i.e., in response to the setting of the rotary strike mode). This causes the movable member 52 to move the driving sleeve 378 backward and switch the clutch mechanism 374 to the transmission state.

[0045] The mode detection device 6 is configured to electrically detect the current mode (the mode set (selected) by the mode setting member 50).

[0046] More specifically, as shown in Figure 2, the mode detection device 6 includes a first switch 61 and a second switch 62, which are electrically connected to the controller 20, respectively. 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 be turned on in response to pressure and to output a predetermined signal (on signal) to the controller 20.

[0047] In this embodiment, the movable member 52 of the mode switching mechanism 51 presses either the first switch 61 or the second switch 62 depending on the mode. More specifically, the movable member 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 and rear positions of the movable member 52 change depending on the set mode. If the set mode is the striking-only mode, the movable member 52 (left arm 521) presses the first switch 61 from behind, turning it on. If the set mode is the rotary striking mode, the movable member 52 (right arm 522) presses the second switch 62 from the front, turning it on. The controller 20 can recognize the current mode based on which of the first switch 61 or the second switch 62 is outputting an ON signal.

[0048] The elements (composition) located on handle 15 are described below.

[0049] As shown in Figures 3 and 4, in this embodiment, the handle 15 mainly comprises a switch operating member 71, a switch 75, a locking member 8, and a protrusion detection device 9.

[0050] The switch operating member 71 is an operating member also called a switch lever or trigger. The switch operating member 71 in this embodiment comprises a main body 710, a projection 72, and a solenoid 73.

[0051] The main body 710 is a long, hollow member that extends generally vertically along the gripping portion 16. The main body 710 is supported by the gripping portion 16 so as to be rotatable around a pivot axis set at its lower end. The pivot axis extends substantially horizontally, and the main body 710 is substantially movable in the front-rear direction. The main body 710 has a front wall portion 711, left and right side walls 713, and an upper wall portion 715. The front wall portion 711 is exposed to the outside of the gripping portion 16 through an opening formed in the front wall portion 165 of the gripping portion 16.

[0052] The projection 72 is provided to cooperate with the locking member 8, described later, to hold the switch operating member 71 in the ON position. In this embodiment, the projection 72 is configured to be movable between a protruding position (shown in Figure 3) that protrudes above the upper surface of the upper wall portion 715 and a retracted position (shown in Figure 4) that does not protrude from the upper surface of the upper wall portion 715. More specifically, the projection 72 is integrated with the plunger 733 of the solenoid 73 located inside the switch operating member 71 and is configured to move in accordance with the ON and OFF switching of the solenoid 73.

[0053] The solenoid 73 is located inside the upper part of the main body 710. The solenoid 73 includes a main body 731, a plunger 733, and a biasing spring 735. The main body 731 includes a frame (case) supported by the main body 710 and a coil housed in the frame, but in the figure, the frame and coil are simplified and shown as a single unit. The plunger 733 is partially located inside the coil and is movable linearly in the axial direction.

[0054] The solenoid 73 in this embodiment is a pull-type solenoid. The plunger 733 is biased by a biasing spring 735 in a direction that causes the tip of the plunger 733 to protrude from the main body 731. As a result, in the off state of the solenoid 73 (non-operating state, initial state without power), the tip of the plunger 733 protrudes from the main body 731. The solenoid 73 is positioned such that the shaft of the plunger 733 extends in the longitudinal direction (generally vertical direction) of the switch operating member 71, and the tip of the plunger 733 faces upward. The projection 72 of the switch operating member 71 is composed of the tip of the plunger 733 and a cap 734 attached to the tip. The projection 72 is positioned at the approximate center of the handle 15 in the left-right direction.

[0055] When the solenoid 73 is in the off state, as shown in Figure 3, the projection 72 protrudes from the upper surface of the upper wall 715 through the opening 716 formed in the upper wall 715 and is held in the protruding position. On the other hand, when the solenoid 73 is turned on (energized), as shown in Figure 4, the plunger 733 moves in the direction of being retracted into the main body 731 (downward), and the projection 72 is held in the retracted position while energized. When the power supply to the solenoid 73 is stopped, the biasing force of the biasing spring 735 causes the projection 72 to return to the protruding position. The solenoid 73 is electrically connected to the controller 20 (see Figure 1), and the controller 20 controls the power supply to the solenoid 73.

[0056] More specifically, the controller 20 controls the energization of the solenoid 73 according to the detection result (i.e., the current mode) from the mode detection device 6 (see Figure 2). When an ON signal is output from the first switch 61 and the current mode is the strike-only mode, the controller 20 does not energize the solenoid 73. Therefore, the solenoid 73 is kept in the OFF state (initial state), and the projection 72 is held 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 rotary strike mode, the controller 20 energizes the solenoid 73. Therefore, the solenoid 73 is kept in the ON state, and the projection 72 is held in the retracted position.

[0057] The switch 75 is located inside the gripping portion 16 (more specifically, directly behind the switch operating member 71). The switch 75 comprises a main body 751 and a plunger 753 biased to protrude forward from the main body 751.

[0058] The plunger 753 is located below the solenoid 73 and contacts the front wall portion 711 of the switch operating member 71 from the rear, biasing the switch operating member 71 forward. Therefore, in the initial state when no rearward pressing force is applied, the switch operating member 71 is held at the foremost position within its rotational range (the position shown in Figure 3). At this time, the switch 75 (body 751) is in the off state. Thus, in the following, the foremost position of the switch operating member 71 will also be referred to as the off position.

[0059] On the other hand, as shown in Figures 5 and 6, when the user presses the switch operating member 71 and moves it backward, the plunger 753 is pushed into the main body 751. As the switch operating member 71 is positioned in the predetermined position, the switch 75 (main body 751) is turned ON. The switch 75 remains ON while the switch operating member 71 is between the predetermined position and the rearmost position within its rotational range. Therefore, in the following, any position of the switch operating member 71 between the predetermined position and the rearmost position (for example, the position shown in Figure 5) will also be referred to as the ON position.

[0060] The switch 75 (main unit 751) is electrically connected to the controller 20 and is configured to output a predetermined signal (on signal) to the controller 20 when it is turned on. Basically, when the controller 20 recognizes the on signal from the switch 75, it starts driving the motor 21.

[0061] As shown in Figures 2 and 3, the locking member 8 is supported on the handle 15 so as to be movable in the left-right direction. More specifically, the locking member 8 includes an elongated body 81. Openings 172 are formed in the left and right side walls 171 of the first connecting portion 17 of the handle 15. The body 81 is supported by the side walls 171 while inserted through the openings 172 and is slidable in the left-right direction. The left end 811 and the right end 812 of the body 81 are exposed to the outside through 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] Furthermore, the locking member 8 has a projection 83 that protrudes downward from the lower end of the main body 81. The lower end of the projection 83 is above the upper surface of the upper wall portion 715 regardless of whether the switch operating member 71 is in the off position or the on position. Also, when the projection 72 of the switch operating member 71 is in the protruding position, the lower end of the projection 83 of the locking member 8 is below the upper end of the projection 72. The projection 83 is positioned to the right of the left-right center of the main body 81. However, the projection 83 may be positioned to the left of the left-right center of the main body 81.

[0063] The locking member 8 in this embodiment has both an unlocked position and a locked position.

[0064] The unlocked position is set such that, in the left-right direction, the projection 83 does not interfere with the movement path of the projection 72 of the switch operating member 71. As described above, the projection 72 of the switch operating member 71 is at the left-right center of the handle 15. Therefore, in this embodiment, as shown in Figures 2 and 3, the unlocked position of the locking member 8 is set such that the left-right center of the locking member 8 substantially coincides with the left-right center of the handle 15. When the locking member 8 is in the unlocked position, the projection 83 of the locking member 8 is positioned to the right of the projection 72 of the switch operating member 71. Thus, the locking member 8 allows the switch operating member 71 to move between the off position (see Figures 2 and 3) and the on position (see Figures 5 and 6) even when the projection 72 is in the protruding position. Furthermore, when the projection 72 is in the protruding position, the projection 72 abuts against the projection 83 from the left, preventing the locking member 8 from moving from the unlocked position to the locked position.

[0065] The lock position is set such that, in the left-right direction, the projection 83 is positioned on the movement path of the projection 72 of the switch operating member 71 from the ON position to the OFF position. Specifically, as shown in Figures 7 and 8, the lock position is set such that the projection 83 substantially coincides with the left-right center of the handle 15. The lock position can also be described as the position where the left-right center of the locking member 8 is shifted to the left from the left-right center of the handle 15. When the locking member 8 is in the lock position and the projection 72 is in the protruding position, the projection 83 abuts against the projection 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 (holding it in the ON position).

[0066] Furthermore, as shown in Figure 3, the handle 15 is provided with a retaining member 86 configured to hold the locking member 8 in the unlocked or locked position. More specifically, the retaining member 86 is a leaf spring and is positioned above the locking member 8 within the first connecting portion 17. Although detailed illustrations are omitted, the retaining member 86 has a protrusion that projects backward. On the other hand, the locking member 8 has a spring receiving portion 85 that projects upward from the main 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 the unlocked or locked position by engaging with either of the recesses.

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

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

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

[0070] In this way, the protrusion detection device 9 detects that the protrusion 72 of the switch operating member 71, which is in the ON position, is in the protruding position by detecting the magnet 95 attached to 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 in response to the detection of the magnet 95. As will be described in detail later, the detection result by the protrusion detection device 9 is used to control the motor 21.

[0071] The operation of the Hammer Drill 1A (particularly the control by the Controller 20 (control circuit)) will be explained below.

[0072] First, the user moves the mode setting member 50 appropriately according to the actual machining operation to be performed, and sets the mode of the hammer drill 1A.

[0073] When the hammer drill 1A is in the 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. Thus, as shown in Figure 3, the projection 72 is held in the protruding position.

[0074] As shown in Figure 5, when the user grasps the switch operating member 71 together with the gripping part 16 and presses the switch operating member 71 to move it backward to the ON position, the switch 75 is turned ON. The controller 20 drives the motor 21 while the first switch 61 is ON and the switch 75 is ON. As shown in Figures 7 and 8, when the user moves the locking member 8 from the unlocked position to the locked position while the switch operating member 71 is in the ON position, the switch operating member 71 is held in the ON position. Therefore, the controller 20 continues to drive the motor 21 even if the user does not continue to press the switch operating member 71.

[0075] When the user returns the locking member 8 to the unlocked position and releases the pressure on the switch operating member 71, the switch operating member 71 returns to the off position. In response to the switch 75 being turned off, the controller 20 stops driving the motor 21.

[0076] When the mode of the hammer drill 1A is rotary impact mode, the controller 20 recognizes the ON signal from the second switch 62 of the mode detection device 6 and turns on the solenoid 73. As a result, as shown in Figure 4, the projection 72 is moved from the protruding position to the retracted position and held there.

[0077] As shown in Figure 9, when the user presses the switch operating member 71 and moves it backward to the ON position, the switch 75 is turned ON. When the second switch 62 is ON, the controller 20 starts driving the motor 21 in response to the switch 75 being turned ON. Note that even if the user moves the locking member 8 to the locked position while the motor 21 is driving, the locking member 8 cannot lock the switch operating member 71 because the projection 72 is in the retracted position. When the user releases the pressure on the switch operating member 71 and the switch 75 is turned OFF, the controller 20 stops driving the motor 21.

[0078] Furthermore, in rotary impact mode, the controller 20 monitors whether an ON signal is output from the protrusion detection device 9 while the motor 21 is being driven. As described above, the protrusion detection device 9 outputs an ON signal when the switch operating member 71 is in the ON position, the projection 72 is in the protruding position, and the locking member 8 is in the locked position (see Figure 8).

[0079] In rotary impact mode, the projection 72 is assumed to be in the retracted position, but there is a possibility that the solenoid 73 may not operate for some reason, leaving the projection 72 in the protruding position. In this state, if the user presses the switch operating member 71 and moves the locking member 8 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 rotation, the tip tool 300 may unexpectedly lock, causing the tool body 10 to rotate excessively, so it is undesirable to hold the switch operating member 71 in the ON position. Therefore, in this embodiment, if the controller 20 recognizes an ON signal from the projection detection device 9 while the motor 21 is being driven, it immediately stops driving the motor 21. This improves safety because it prevents the tool body 10 from rotating excessively even if the tip tool 300 is locked.

[0080] As described above, in the hammer drill 1A of this embodiment, the projection 83 of the locking member 8 contacts the projection 72 of the switch operating member 71, thereby holding the switch operating member 71 in the ON position. Since the projection 72 is integrated with the plunger 733 of the solenoid 73, it moves between the protruding position and the retracted position in accordance with the operation of the solenoid 73. The switch 75 is located within the gripping portion 16, while the solenoid 73 is housed in the body 710 of the switch operating member 71. In other words, in this embodiment, the interior of the body 710 of the switch operating member 71, rather than the gripping portion 16, is effectively utilized as a housing space for the solenoid 73 that moves the projection 72 between the protruding position and the retracted position according to the mode. Thus, a compact locking structure that can operate according to the mode is realized.

[0081] In particular, in this embodiment, the projection 83 of the locking member 8 contacts the front region of the projection 72 of the switch operating member 71, which is in a protruding position, thereby holding the switch operating member 71 in the ON position. Therefore, the user can move the switch operating member 71 backward to any position where the projection 72 is positioned behind the projection 83, thereby moving the locking member 8 to the locked position and holding the switch operating member 71 in the ON position. Thus, since precise alignment of the projections 72 and 83 is not required, this structure is more convenient than a structure that locks the switch operating member 71 by engagement between a recess and a protrusion.

[0082] Furthermore, in this embodiment, a pull-type solenoid is used for the solenoid 73. Therefore, when the locking member 8 contacts the projection 72 in the protruding position and holds the switch operating member 71 in the ON position, the solenoid 73 is in the OFF state. Also, when the solenoid 73 is in the ON state, the projection 72 is in the retracted position. Thus, in this embodiment, the plunger 733 of the solenoid 73 only needs to be responsible for the movement of the projection 72, and does not require any extra load to hold the switch operating member 71 in the ON position when it is in the ON state. Therefore, the durability of the solenoid 73 can be improved compared to when a push-type solenoid is used.

[0083] <Second Embodiment> The hammer drill 1B according to the second embodiment will be described below with reference to Figures 10 and 11. Note that the hammer drill 1B of the second embodiment differs from the hammer drill 1A of the first embodiment in the manner of connection between the tool body 10 and the handle 15, but the other configurations are substantially the same as those of the hammer drill 1A. Therefore, in the following description, components substantially identical to those of the hammer drill 1A will be denoted by the same reference numerals, and their descriptions will be simplified or omitted.

[0084] As shown in Figures 10 and 11, in the hammer drill 1B of this embodiment, the tool body 10 and the handle 15 are connected via elastic members 191 and 193 so as to be able to move relative to each other.

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

[0086] In this embodiment, compression coil springs are used for the elastic members 191 and 193. However, other types of mechanical springs (e.g., torsion springs, disc springs), rubber, or elastic synthetic resins may be used. The elastic members 191 and 193 each bias the tool body 10 and the handle 15 in a direction away from each other in the front-rear direction. This elastic coupling structure suppresses the transmission of vibrations from the tool body 10 to the handle 15.

[0087] In the hammer drill 1B, as in the first embodiment, the handle 15 is equipped with a switch operating member 71 housing a 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 the mode is realized by utilizing the space within the main body 710 of the switch operating member 71.

[0088] Conventionally, hammer drills are known that utilize a movable member extending rearward from the tool body and moving in the forward and backward directions in accordance with the operation of a mode switching mechanism, thereby selectively restricting the movement of the locking member of the switch lever according to the set mode. Specifically, in modes in which the tip tool is rotationally driven, such a movable member interferes with the locking member and prevents it from moving to the locked position. However, in this embodiment, the first connecting portion 17 on which the locking member 8 is located is connected to the tool body 10 via an elastic member 191. In a hammer drill 1B having such a vibration-damping structure, if a conventional movable member 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, it is useful to electrically detect the set mode using a mode detection device 6 (see Figure 2) and control the solenoid 73 according to the mode to enable or disable the holding of the switch operating member 71 in the ON position.

[0089] The above embodiments are merely illustrative, and the impact tools relating to this disclosure are not limited to the illustrated hammer drills 1A and 1B. For example, modifications as illustrated below can be made. Furthermore, at least one of these modifications may be adopted in combination with the hammer drills 1A and 1B illustrated in the embodiments and at least one of the features described in each claim.

[0090] The hammer drill according to this disclosure may have other modes in addition to the impact-only mode and the rotational impact mode (for example, a rotation-only mode in which only rotational movement is performed, a drive-off mode in which the cutting tool is not driven, etc.). For example, the hammer drill may have an impact-only mode, a rotational impact mode, and a rotation-only mode. The operation of the hammer drill in the rotation-only mode does not need to be substantially the same as the operation in the rotational impact mode described in the above embodiment. Furthermore, the mode switching mechanism and mode setting member for changing modes are not limited to the examples of the above embodiment, and any known configuration may be used.

[0091] The mode detection device according to this disclosure only needs to be able to electrically detect whether the current mode is a specific mode, and may have any configuration. For example, in hammer drills 1A and 1B that have only a striking mode and a rotary striking mode (or one other mode), the mode detection device 6 may be equipped with only one of the first switch 61 and the second switch 62. Alternatively, the mode detection device may detect the movement of any component of the mode switching mechanism, or it may detect the movement of a mode setting component. Or, the mode detection device may be configured to detect a mode set via an input device (e.g., a push-button switch, a slide switch, a touchscreen).

[0092] The configuration of the tool body 10 and / or handle 15 can be modified as appropriate. For example, a tool body having a shape other than L-shape in side view may be used. A handle may be used in which only one end is connected to the tool body in a cantilevered manner, rather than both ends being connected to the tool body 10.

[0093] The configuration and / or arrangement of the motor 21 and drive mechanism 3 within the tool body 10 may be modified as appropriate in accordance with or regardless of modifications to the tool body 10. For example, a brushless motor may be used instead of the motor 21. The motor may be driven by power supplied from a rechargeable battery. The motor may be positioned so that the rotation axis RX intersects the drive axis DX at an angle, or so that it is parallel to the drive axis DX. Instead of the motion conversion mechanism 31 of the drive mechanism 3, a well-known motion conversion mechanism may be used, which is configured to reciprocate a piston using a member that oscillates in accordance with the rotation of a rotating body (e.g., a swash bearing, a wobble plate / bearing).

[0094] The switch operating member according to this disclosure comprises a body, a projection, and a solenoid housed in the body, and its configuration (e.g., shape, components) and / or support configuration may be modified as appropriate.

[0095] For example, the switch operating member may be biased to the off position by a biasing spring separate from the switch plunger. The projection of the switch operating member may consist only of the tip of the solenoid plunger. Also, the retracted position of the projection may allow the protruding end of the projection to slightly protrude from the switch operating member, as long as it does not interfere with the locking member positioned in the locked position.

[0096] Furthermore, although the solenoid 73 is a pull type in the above embodiment, the use of a push type is not excluded. When a push type is used, the projection of the switch operating member is held in the retracted position when the solenoid is in the off state, and the projection is held in the protruding position when the solenoid is in the on state. In this modified example, the controller 20, based on the detection result of the mode detection device 6, determines that the current mode is a mode in which the tip tool is rotated (rotational impact mode or rotation-only mode), and keeps the solenoid in the off state. Also, the controller 20 determines that the current mode is impact-only mode, and turns the solenoid on.

[0097] The locking member according to this disclosure may be configured and / or arranged in any way as appropriate, provided that it can hold the switch operating member in the ON position. For example, the locking member may have a projection that extends in the left-right direction and can contact a projection of the switch operating member. The locking member may be configured to be movable in the vertical direction or rotatable around an axis, for example.

[0098] Alternatively, instead of the retaining member 86, a retaining member (for example, a spring) configured to bias and hold the locking member 8 in the unlocked position may be used. In this case, the locking member 8 may be held in the locked position by a switch operating member 71 that is biased toward the off position. Alternatively, the retaining member 86 may be changed to a member that engages with the locking member 8 to lock it, or it may be omitted.

[0099] The protrusion detection device 9 may be modified or omitted as appropriate. For example, the mounting positions of the Hall sensor 93 and the magnet 95 may 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 should be configured not to start driving the motor 21 if it recognizes that the current mode is rotational striking mode (or rotation-only mode) and the protrusion 72 is in the protruding position. In addition, other types of magnetic field detection sensors may be used instead of the Hall sensor 93, or optical sensors or contact switches may be used.

[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 may control the operation of the solenoid 73 and the operation of the motor 21 separately.

[0101] In view of the spirit of the present invention and the embodiments described above, the following embodiments are constructed. At least one of the following embodiments may be adopted in combination with the features of the embodiments and their modifications, or at least one of the features described in each claim. [Aspect 1] The projection includes the tip of the plunger. [Aspect 2] The solenoid includes a biasing member that biases the plunger toward the protruding position. [Aspect 3] The hammer drill includes a control device configured to control the operation of the solenoid based on the detection result of the mode detection device. [Aspect 4] The control device is configured to control the drive of the motor based at least on the state of the switch. [Aspect 5] The control device is configured to control the drive of the motor based on the detection result of the mode detection device and the detection result of the protrusion detection device. [Aspect 6] The hammer drill further includes a biasing member that biases the switch operating member toward the off position. The plunger 753 of the switch 75 in the above embodiment is a non-limiting example of the "biasing member" in this embodiment. [Aspect 7] The hammer drill includes a retaining member capable of holding the locking member in the locked position and the unlocked position, respectively. [Aspect 8] The locking member is located within the upper end of the handle. The upper end of the handle is connected to the tool body via at least one elastic member. [Explanation of symbols]

[0102] 1A, 1B: Hammer drill, 10: Tool body, 11: Drive mechanism housing, 115: Rear wall, 13: Motor housing, 135: Rear wall, 15: Handle, 16: Gripping 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 member, 193: Elastic member, 20: Controller, 21: Motor, 215: Motor 29: Shaft, 3: Power cord, 3: Drive mechanism, 30: Tool holder, 300: Tip tool, 31: Motion conversion mechanism, 311: Crankshaft, 313: Connecting rod, 315: Piston, 32: Cylinder, 33: Striking element, 34: Striker, 35: Impact bolt, 37: Rotation transmission mechanism, 371: Intermediate shaft, 372: Small bevel gear, 374: Clutch mechanism, 375: Gear sleeve ,376: Large bevel gear, 378: Driving sleeve, 50: Mode setting member, 51: Mode switching mechanism, 52: Movable member, 521: Left arm, 522: Right arm, 53: Motion conversion mechanism, 6: Mode detection device, 61: First switch, 62: Second switch, 71: Switch operating member, 710: Main body, 711: Front wall, 713: Side wall, 715: Top wall, 716: Opening, 72: Protrusion, 7 3: Solenoid, 731: Main body, 733: Plunger, 734: Cap, 735: Biasing spring, 75: Switch, 751: Main body, 753: Plunger, 8: Locking member, 81: Main body, 811: Left end, 812: Right end, 83: Projection, 85: Spring receiver, 86: Holding member, 89: Extension, 9: Protrusion detection device, 91: Substrate, 93: Hall sensor, 95: Magnet, DX: Drive shaft, RX: Rotation shaft

Claims

1. A hammer drill configured to operate selectively in a plurality of 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 rotated at least around the drive axis, Switch and A motor configured to be driven when the aforementioned switch is in the ON state, A switch operating member comprising: a main body that is normally held in the off position, which keeps the switch off, and is movable to the on position, which keeps the switch on, in response to manual operation by the user; and a projection that is movable between a protruding position that extends outward from the main body and a retracted position that does not extend outward from the main body, or the amount of protrusion from the main body is less than that of the protruding position; A locking member is movable in response to the user's manual operation between an unlocked position that allows movement between the ON position and the OFF position of the switch operating member, and a locked position that abuts against the projection in the protruding position and holds the switch operating member in the ON position. The hammer drill is equipped with a mode detection device configured to electrically detect the current mode of the hammer drill, The main body of the switch operating member houses a solenoid configured to operate based on the detection result of the mode detection device. The hammer drill is characterized in that the projection 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.

2. A hammer drill according to claim 1, The solenoid is a pull-type solenoid, The hammer drill is characterized in that the projection is located in the protruding position when the solenoid is in the off state and moves to the retracted position when the solenoid is turned on.

3. A hammer drill according to claim 2, The device further comprises a protrusion detection device configured to detect whether the protrusion is in the protruding position, The hammer drill is characterized in that the motor is configured such that when the current mode is the second mode, the protrusion detection device detects that the protrusion is in the protruding position, and the motor is not driven.

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

5. A hammer drill according to any one of claims 1 to 4, The hammer drill is characterized in that the projection is movable in a direction intersecting the direction of movement of the main body of the switch operating member.

6. A hammer drill according to any one of claims 1 to 4, The hammer drill is characterized in that the projection is movable in a direction intersecting the direction of movement of the locking member.

7. A hammer drill according to claim 5, The drive shaft defines the front-to-back direction of the hammer drill, The system further includes a gripping portion that extends in the vertical direction perpendicular to the drive shaft, The main body of the switch operating member is supported by the gripping portion so as to be substantially movable in the front-rear direction between the off position and the on position located behind the off position. The projection is substantially movable in the vertical direction at the upper end of the switch operating member. The hammer drill is characterized in that the locking member, in the locked position, abuts against the front region of the projection positioned at the protruding position, and is configured to prevent the switch operating member from moving from the ON position to the OFF position.

8. A hammer drill according to claim 7, The locking member is characterized in that it is movable in the left-right direction perpendicular to the front-rear direction and the up-down direction.

9. A hammer drill according to any one of claims 1 to 4, The drive shaft defines the front-to-back direction of the hammer drill, The system further includes a gripping portion that extends in the vertical direction perpendicular to the drive shaft, The switch is located inside the gripping portion, The switch operating member is supported by the gripping portion so as to be movable between the off position and the on position which is rearward from the off position. The hammer drill is characterized in that the solenoid is located in front of the switch in the front-to-back direction.

10. A hammer drill according to any one of claims 1 to 4, A tool body that houses at least the motor, It further includes a handle that includes a gripping portion, The switch operating member and the locking member are supported by the handle, A hammer drill characterized in that the tool body and the handle are connected via at least one elastic member.

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