JP2018079557A - Electric tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology that contributes to damage countermeasures of an external exposure portion of a battery in an electric tool configured so that the battery can be detachably attached thereto.SOLUTION: A hammer drill 1 includes: a motor 2 having a rotation axis A2 which vertically extends intersecting with a work axis A1 extending in a fore and aft direction; a housing 10 which houses the motor 2; a battery attachment part 6 which is configured so that a battery 9 can be detachably attached thereto, provided at the housing 10, disposed at the opposite side of the work axis A1 across the motor 2 in a vertical direction; and a battery protection part 7 provided at an outer surface part of the housing 10. The battery attachment part 6 is configured so that an upper end part of the battery 9 is attached to the battery attachment part 6 and a lower end part of the battery 9 is exposed from the housing 10. The battery protection part 7 is configured so as to protect at least one corner section area 90 of the lower end part of the battery 9 from external force when the upper end part of the battery 9 is attached to the battery attachment part 6.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electric tool configured to be detachable from a battery.

  Various electric tools using a rechargeable battery as a power source are known. For example, Patent Literature 1 discloses a striking tool that linearly moves a tool bit on a striking shaft extending in the front-rear direction, and is connected to a tool main body that houses a motor and a rear end portion of the tool main body, A striking tool with a handgrip extending to the is disclosed. The tool main body is provided with a battery mounting portion to which two batteries can be attached and detached, behind the motor and below the hand grip.

JP 2014-148014 A

  Unlike the impact tool described above, when the battery is installed at the lower position rather than behind the motor, typically, the entire battery excluding the mounting position on the tool body above the battery is exposed to the outside of the tool body. It is easy to end up. For this reason, when an external force is applied to the battery for some reason such as dropping, the possibility of damage to the battery increases. Therefore, when such a battery mounting position is employed, it is desired to take measures against damage to the exposed portion of the battery from the tool body (housing).

  This invention makes it a subject to provide the technique which contributes to the damage countermeasure of the location exposed from the housing of a battery in the electric tool comprised so that the battery was removable.

  According to an aspect of the present invention, an electric tool including a motor, a housing, a battery mounting portion, and a battery protection portion is provided.

  The motor has a rotating shaft extending in a direction intersecting with a work axis extending in the front-rear direction of the electric power tool. The housing houses the motor. The battery mounting unit is configured to be detachable with at least one battery. Further, the battery mounting portion is provided in the housing, and is disposed on the opposite side of the work shaft across the motor in the extending direction of the rotation shaft of the motor. The battery protection part is provided on the outer surface of the housing. The battery mounting portion is configured such that one end of at least one battery is mounted on the battery mounting portion and the opposite end of the battery is exposed from the housing in the extending direction of the rotation shaft of the motor. The battery protection unit is configured to protect at least one corner region of the opposite end of at least one battery from an external force when one end of the battery is mounted on the battery mounting unit.

  In addition, said "electric tool" means the tool generally used for work etc. which operate | move using the electric power supplied from a battery. In addition, the “work axis” of the electric tool corresponds to a drive shaft of a hitting tool in a so-called hitting tool (for example, a hammer drill) configured to drive the hitting tool linearly. Further, for example, in a so-called rotary tool (for example, a shear wrench) configured to rotationally drive the final output shaft, it corresponds to the rotation axis of the final output shaft.

  The housing is a portion that is also referred to as a so-called tool body, and may be configured to accommodate at least a motor. For example, in the housing, a part for accommodating the motor and a part for accommodating the other internal mechanism may be separately formed and connected. Further, it may be a so-called anti-vibration housing, which is composed of a plurality of parts connected to each other via elastic elements so as to be movable relative to each other.

  The shape of the battery that can be mounted on the battery mounting portion is not particularly limited, but a typical shape includes a substantially rectangular parallelepiped shape (including a shape in which corners are chamfered). In the case of a battery having a substantially rectangular parallelepiped shape, the corner region may be rephrased as a region corresponding to the vertex of the rectangular parallelepiped. In addition, the phrase “exposed from the housing” can also be said to be disposed outside the housing and exposed openly toward the outside.

  When one end portion of the battery is attached to the battery attachment portion, the corner region of the opposite end portion exposed to the outside is a portion that is easily damaged when an external force is applied as compared to other regions. On the other hand, the electric power tool of this mode can protect at least one corner area of the opposite end of the battery from an external force by the battery protection unit, and can reduce the possibility of the battery being damaged.

  According to one aspect of the present invention, the battery protection part may be formed by a part of the housing. According to this aspect, it is possible to easily form the battery protection unit without increasing the number of components.

  According to one aspect of the present invention, the battery protection unit may be formed as a member separate from the housing and attached to the housing. The method for attaching the battery protection part to the housing is not particularly limited. For example, the battery protection part formed in advance using the same material as the housing or a different material is bonded to the housing, fixed by screws, or sandwiched. It may be attached by such a method. Alternatively, the battery protection unit made of a material different from that of the housing may be integrally formed with the housing, so that the battery protection unit may be attached to the housing. According to this aspect, the freedom degree of design of a battery protection part can be raised, keeping a housing in a simple shape.

  According to one aspect of the present invention, the battery protection unit may be formed of a material different from that of the housing. According to this aspect, the housing and the battery protection part can be formed of materials suitable for each.

  According to one aspect of the present invention, the battery protection unit may include a front side protection unit and a rear side protection unit that are disposed on both sides of the battery mounting unit in the front-rear direction. According to this aspect, two protection parts (a front protection part and a rear protection part) are provided on the front side and the rear side of the battery mounting part, so that the corner area arranged on the front side and the rear side are arranged. The corner area can be protected from external forces.

  According to an aspect of the present invention, the battery protection unit includes a pair of front protection units disposed on both sides of the front region of the battery mounting unit and a rear part of the battery mounting unit in a direction intersecting the work axis and the rotation axis. A pair of rear side protection portions disposed on both sides of the region may be included. By providing the protection portions on both sides of the front region and the rear region of the battery mounting unit, the corner region disposed on the front side and the corner region disposed on the rear side can be protected from external force. .

  According to one aspect of the present invention, the battery mounting unit may be configured to be detachable with a plurality of batteries arranged in the front-rear direction. According to this aspect, the electric power tool can exhibit higher output by using the plurality of batteries mounted on the battery mounting portion as compared with the electric power tool on which only one battery can be mounted.

  According to one aspect of the present invention, when the power tool is disposed such that the work shaft extends in the horizontal direction and the rotation shaft extends in the vertical direction, the battery mounting portion is disposed below the motor. The battery protection unit may be configured such that the lower surface of the battery protection unit is substantially flush with the lower surface of the battery when mounted on the battery mounting unit. According to this aspect, the power tool can be placed on the ground or floor surface in a stable posture with the lower surface of the battery protection portion and the lower surface of the battery as the placement surfaces.

  According to one aspect of the present invention, the battery protection unit is orthogonal to a virtual straight line connecting the center of gravity of the electric tool and the corner region when the battery is mounted on the battery mounting unit, and passes through the corner region. You may form so that it may protrude in the direction away from a gravity center rather than a plane. In general, when the electric tool falls with the battery mounted, the center of gravity of the electric tool rests on the corner area (in other words, the posture where the center of gravity is located directly above the corner area, Alternatively, when the corner area collides with the ground or floor (with the full weight of the power tool acting on the corner area), the impact applied to the corner area increases and the possibility of damage increases. On the other hand, according to this aspect, by forming the battery protection unit so as to protrude from the virtual plane, the battery protection unit can be operated even when the electric tool falls with the center of gravity on the corner region. Since it collides with the ground and the floor first, the corner area can be effectively protected.

  According to one aspect of the present invention, the electric power tool may further include an additional mechanism that is disposed in the internal space of the battery protection unit and configured to exhibit a function different from the protection of the corner region of the battery. Good. According to this aspect, the convenience of the power tool can be enhanced by effectively utilizing the internal space of the battery protection unit that is likely to be an empty space.

  According to one aspect of the present invention, a part of the housing forming the battery protection unit is made of resin, and the electric tool further includes a metal reinforcing member at least a part of which is disposed on the battery protection unit. May be. According to this aspect, when a battery protection part receives external force, possibility that a battery protection part will be damaged can be reduced. Thereby, possibility that a battery will be damaged can be reduced more reliably.

  According to one aspect of the present invention, a plurality of types of batteries having different lengths in the extending direction of the rotating shaft can be selectively attached to and detached from the battery mounting portion, and the battery protection portion is formed by extending the rotating shaft. The length in the direction may be adjustable. According to this aspect, the length of the battery protection unit can be adjusted according to the length of the battery mounted on the battery mounting unit. Thereby, the corner | angular area | region of the mounted battery can be protected appropriately.

It is a longitudinal cross-sectional view of the hammer drill which concerns on 1st Embodiment. It is explanatory drawing which shows a hammer drill in the state by which a part of housing was removed by the back view. It is a longitudinal cross-sectional view of a part of the hammer drill according to the second embodiment. It is a rear view of a part of a hammer drill. It is a longitudinal cross-sectional view of a part of the hammer drill according to the third embodiment. It is a longitudinal cross-sectional view of the hammer drill which concerns on 4th Embodiment. It is a rear view of a part of a hammer drill. It is a longitudinal cross-sectional view of a part of the hammer drill according to the fifth embodiment. It is a longitudinal cross-sectional view of a part of the hammer drill according to the sixth embodiment. It is a longitudinal cross-sectional view of the hammer drill which concerns on 7th Embodiment. It is a longitudinal cross-sectional view of a part of the hammer drill according to the eighth embodiment. It is a longitudinal cross-sectional view of a part of the hammer drill according to the ninth embodiment. It is another longitudinal cross-sectional view of a part of hammer drill concerning a 9th embodiment.

  Hereinafter, embodiments will be described with reference to the drawings. In the following embodiments, a hammer drill is illustrated as an example of an electric tool.

<First Embodiment>
Hereinafter, the hammer drill 101 according to the first embodiment will be described with reference to FIGS. 1 and 2. The hammer drill 101 uses the battery 9 as a power source to drive the tip tool 18 linearly along a predetermined work axis A1 (striking motion), and to rotate the tip tool 18 around the work axis A1 (drill) Operation).

  First, a schematic configuration of the hammer drill 101 will be described. As shown in FIG. 1, the outline of the hammer drill 101 is mainly formed by a housing 10. The housing 10 of the present embodiment is configured as a so-called vibration-proof housing, and includes a first housing portion 11 and a second housing portion 13 that is elastically connected to the first housing portion 11 so as to be relatively movable.

  The first housing portion 11 includes a motor housing portion 111 that houses the motor 2, and a drive mechanism housing portion 117 that houses the drive mechanism 3 configured to drive the tip tool 18 by the power of the motor 2. As shown in FIG. The drive mechanism accommodating portion 117 is formed in a long shape extending in the direction of the work axis A1. A tool holder 34 configured to be detachable from the tip tool 18 is provided at one end of the drive mechanism housing 117 in the direction of the work axis A1. The motor housing portion 111 is connected and fixed to the drive mechanism housing portion 117 so as not to move relative to the other end portion of the drive mechanism housing portion 117 in the working axis A1 direction. It arrange | positions so that it may protrude in the direction away from A1. In the motor housing 111, the motor 2 is arranged so that the rotation axis A2 of the motor shaft 25 extends in a direction perpendicular to the work axis A1.

  In the following description, for the sake of convenience, the working axis A1 direction of the hammer drill 101 is defined as the front-rear direction of the hammer drill 101, and one end side where the tool holder 34 is provided is defined as the front side of the hammer drill 101 and the opposite side is defined as the rear side. To do. Further, the extending direction of the rotation axis A2 of the motor shaft 25 is defined as the vertical direction of the hammer drill 101, the direction in which the motor accommodating portion 111 protrudes from the drive mechanism accommodating portion 117 is defined as the downward direction, and the opposite direction is defined as the upward direction.

  The second housing portion 13 includes a grip portion 131, an upper portion 133, and a lower portion 136, and is formed in a substantially U shape as a whole. The grip 131 is configured to be gripped by an operator and is arranged to extend in the direction of the rotation axis A2 of the motor shaft 25 (that is, the vertical direction). More specifically, the grip portion 131 extends in the up-down direction while being spaced apart rearward from the first housing portion 11. The upper portion 133 is a portion connected to the upper end portion of the grip portion 131. In the present embodiment, the upper portion 133 extends forward from the upper end portion of the grip portion 131 and is configured to cover most of the drive mechanism accommodating portion 117 of the first housing portion 11. The lower portion 136 is a portion connected to the lower end portion of the grip portion 131. In the present embodiment, the lower portion 136 extends forward from the lower end portion of the grip portion 131 and is disposed below the motor housing portion 111. A battery mounting portion 6 is provided at the lower end of the central portion in the front-rear direction of the lower portion 136. The hammer drill 101 is operated by electric power supplied from the battery 9 attached to the battery attachment unit 6.

  With the above configuration, in the hammer drill 101, in addition to the second housing part 13, the motor housing part 111 of the first housing part 11 is exposed to the outside while being sandwiched from above and below by the upper part 133 and the lower part 136. Thus, the outer surface of the hammer drill 101 is formed.

  Hereinafter, a detailed configuration of the hammer drill 101 will be described. First, the vibration-proof housing structure of the housing 10 will be briefly described. As described above, in the housing 10, the second housing portion 13 including the grip portion 131 is elastically connected to the first housing portion 11 that accommodates the motor 2 and the driving mechanism 3 so as to be relatively movable, thereby The suppression of vibration transmission from the first housing portion 11 to the second housing portion 13 (particularly, the grip portion 131) is achieved.

  More specifically, as shown in FIG. 1, a pair of left and right first springs 41 are disposed between the drive mechanism housing portion 117 of the first housing portion 11 and the upper portion 133 of the second housing portion 13. ing. Further, a second spring 42 is disposed between the motor housing part 111 of the first housing part 11 and the lower part 136 of the second housing part 13. In this embodiment, the 1st spring 41 and the 2nd spring 42 are comprised by the compression coil spring, and the holding part 131 is the 1st housing part 11 and the 2nd housing part 13 in the working-axis A1 direction. It is biased in a direction away from the housing part 11.

  Furthermore, the upper portion 133 and the lower portion 136 are configured to be slidable with respect to the upper end portion and the lower end portion of the motor accommodating portion 111, respectively. More specifically, the lower surface of the upper portion 133 and the upper end surface of the motor housing portion 111 are formed as sliding surfaces that are slidable in the direction of the work axis A1 while being in contact with each other. Configure. Further, the upper surface of the lower portion 136 and the lower end surface of the motor housing portion 111 are formed as sliding surfaces that can slide in the direction of the work axis A1 while being in contact with each other, and constitute the lower sliding portion 47. To do. The upper sliding portion 46 and the lower sliding portion 47 function as a sliding guide that guides the first housing portion 11 and the second housing portion 13 to move relative to each other in the direction of the work axis A1. Accordingly, it is possible to effectively suppress the largest and dominant vibration in the direction of the work axis A <b> 1 among the vibrations generated when the hitting operation is performed.

  Hereinafter, the detailed configuration and the internal structure of the first housing part 11 will be described.

  As shown in FIG. 1, in the first housing portion 11, the motor housing portion 111 is formed in a bottomed rectangular tube shape whose upper side is open. The drive mechanism housing portion 117 is connected and fixed to the motor housing portion 111 so as not to move relative to the motor housing portion 111 in a state where the lower end portion of the rear side portion is disposed in the upper end portion of the motor housing portion 111. In the present embodiment, a small and high-output brushless motor is accommodated as the motor 2 in the motor accommodating portion 111. The motor shaft 25 extending in the vertical direction is rotatably supported by bearings at the upper and lower ends. The upper end portion of the motor shaft 25 protrudes into the drive mechanism housing portion 117, and a drive gear 29 is formed in this portion.

  Of the first housing part 11, the drive mechanism accommodation part 117 accommodates the drive mechanism 3 including the motion conversion mechanism 30, the striking element 36, and the rotation transmission mechanism 38.

  The motion conversion mechanism 30 is configured to convert the rotational motion of the motor 2 into a linear motion and transmit it to the striking element 36. In the present embodiment, a crank mechanism is employed as the motion conversion mechanism 30. More specifically, the motion conversion mechanism 30 includes a crankshaft 31, a connecting rod 32, a piston 33, and a cylinder 35. The crankshaft 31 is disposed in parallel to the motor shaft 25 at the rear end portion of the drive mechanism housing portion 117. The crankshaft 31 has a driven gear that meshes with the drive gear 29 and an eccentric pin. One end of the connecting rod 32 is connected to an eccentric pin, and the other end is connected to the piston 33 via a connecting pin. The piston 33 is slidably disposed in the cylindrical cylinder 35. The cylinder 35 is coaxially connected and fixed to the rear portion of the tool holder 34 disposed in the tip region of the drive mechanism housing portion 117. When the motor 2 is driven, the piston 33 is reciprocated within the cylinder 35 in the direction of the work axis A1.

  The striking element 36 includes a striker 361 and an impact bolt 363. The striker 361 is disposed in the cylinder 35 so as to be slidable in the direction of the work axis A1. Between the striker 361 and the piston 33, an air chamber 365 is formed for linearly moving the striker 361 as the striker through the pressure fluctuation of the air generated by the reciprocating movement of the piston 33. The impact bolt 363 is configured as an intermediate that transmits the kinetic energy of the striker 361 to the tip tool 18, and is disposed in the tool holder 34 so as to be slidable in the direction of the work axis A1.

  When the motor 2 is driven and the piston 33 is moved forward, the air in the air chamber 365 is compressed and the internal pressure rises. For this reason, the striker 361 is pushed forward at a high speed and collides with the impact bolt 363 to transmit kinetic energy to the tip tool 18. As a result, the tip tool 18 is driven linearly along the work axis A1 and strikes the workpiece. On the other hand, when the piston 33 is moved rearward, the air in the air chamber 365 is expanded, the internal pressure is reduced, and the striker 361 is drawn rearward. The hammer drill 101 performs a striking operation by causing the motion conversion mechanism 30 and the striking element 36 to repeat such operations.

  The rotation transmission mechanism 38 is configured to transmit the rotational power of the motor shaft 25 to the tool holder 34. In the present embodiment, the rotation transmission mechanism 38 is configured as a gear reduction mechanism including a plurality of gears, and the rotational power of the motor 2 is transmitted to the tool holder 34 after being appropriately decelerated. A meshing clutch is disposed on the power transmission path of the rotation transmission mechanism 38. When the clutch is engaged, the rotational power of the motor shaft 25 is transmitted to the tool holder 34 by the rotation transmission mechanism 38, and the tip tool 18 mounted on the tool holder 34 is driven to rotate around the work axis A1. Is done. On the other hand, when the engagement state of the clutch is released, the power transmission to the tool holder 34 by the rotation transmission mechanism 38 is interrupted, and the tip tool 18 is not rotated.

  The hammer drill 101 of the present embodiment is configured such that one of two drive modes of the hammer mode and the hammer drill mode can be selected by operating a mode switching dial 4 that is rotatably arranged at the upper end of the drive mechanism housing portion 117. Has been. The hammer mode is a drive mode in which only the striking operation is performed when the clutch is disengaged and only the motion conversion mechanism 30 is driven. The hammer drill mode is a drive mode in which a striking operation and a drill operation are performed when the clutch is engaged and the motion conversion mechanism 30 and the rotation transmission mechanism 38 are driven. Since the mechanism for mode switching is a well-known technique, a description thereof is omitted here.

  Hereinafter, the detailed configuration and the internal structure of the second housing part 13 will be described.

  As shown in FIG. 1, the rear portion of the upper portion 133 is formed in a substantially rectangular box shape having an opening on the lower side, and the rear portion of the drive mechanism housing portion 117 (more specifically, the motion conversion mechanism 30 and The portion in which the rotation transmission mechanism 38 is accommodated is covered from above. The front portion of the upper portion 133 is formed as a cylindrical barrel portion 134. The barrel portion 134 covers the outer periphery of the front portion of the drive mechanism housing portion 117 (more specifically, the portion in which the tool holder 34 is housed). An auxiliary handle is detachably mounted on the outer peripheral surface of the barrel portion 134. Since the auxiliary handle is well known, detailed description and illustration are omitted here.

  A trigger 14 that can be pressed by an operator is provided at the front of the grip 131. A switch 145 that is switched between an on state and an off state in accordance with the operation of the trigger 14 is provided in the grip portion 131 formed in a cylindrical shape.

  The lower portion 136 is formed in a rectangular box shape with a part of the upper side opened, and is disposed below the motor housing portion 111. The controller 5 is disposed inside the lower portion 136. The controller 5 is electrically connected to the motor 2, the switch 145, the battery mounting unit 6, and the like by wiring not shown. When the trigger 14 is pressed and the switch 145 is turned on, the controller 5 starts energizing the motor 2 (that is, driving the tip tool 18), the pressing operation of the trigger 14 is released, and the switch 145 is turned on. When it is in the off state, the power supply to the motor 2 is stopped.

  Further, as described above, the battery mounting portion 6 is provided at the lower end portion of the central portion in the front-rear direction of the lower portion 136. In the present embodiment, the battery mounting portion 6 includes two mounting portions that are arranged side by side in the front-rear direction and have the same configuration. Hereinafter, of the two mounting portions, the mounting portion disposed on the front side is referred to as a front mounting portion 61, and the mounting portion disposed on the rear side is referred to as a rear mounting portion 66. Each of the front mounting portion 61 and the rear mounting portion 66 is configured so that the rechargeable battery 9 can be attached and detached. Therefore, the two battery 9 can be attached to and detached from the battery mounting portion 6 in a state where the two batteries 9 are arranged in the front-rear direction. Therefore, the hammer drill 101 can exhibit higher output than a hammer drill to which only one battery 9 can be attached. The battery 9 that can be attached to and detached from the hammer drill 101 according to the present embodiment is a battery having a capacity of 18 volts.

  Here, the configuration of the battery 9 will be briefly described. As shown in FIGS. 1 and 2, the battery 9 is formed in a substantially rectangular parallelepiped shape. The battery 9 includes a hook 91, a terminal (not shown), a pair of guide grooves 93, and a button 95. For convenience of explanation, with respect to the direction of the battery 9, the vertical direction is defined in a state where the battery 9 is mounted on the hammer drill 101.

  The hook 91 and the terminal are provided on the upper surface of the battery 9. The hook 91 is urged by a spring (not shown) at one end in the longitudinal direction of the battery 9 (the direction orthogonal to the plane of FIG. 1, the left-right direction in FIG. 2) so as to protrude upward from the upper surface at all times. 9 is configured to be retracted downward from the upper surface by a pressing operation of a button 95 provided on the side surface. The terminal is provided on the upper surface of the battery 9 adjacent to the hook 91. The pair of guide grooves 93 are formed as grooves extending linearly in the longitudinal direction at the upper ends of the pair of side surfaces disposed along the longitudinal direction of the battery 9.

  Corresponding to the battery 9 having such a configuration, each of the front mounting portion 61 and the rear mounting portion 66 is mounted with the upper end portion of the battery 9 with a part of the battery 9 exposed on the lower side. It is configured as follows. Specifically, each of the front mounting portion 61 and the rear mounting portion 66 includes a hook engaging portion 601, a pair of guide rails 603, and a battery connection terminal 605.

  The hook engaging portion 601 is a concave portion that is recessed upward, and is configured such that the hook 91 of the battery 9 can be engaged therewith. The pair of guide rails 603 extend linearly in the left-right direction and are configured to be slidably engaged with the pair of guide grooves 93 of the battery 9. The battery connection terminal 605 is electrically connected to the terminal of the battery 9 as the battery 9 is attached to the front attachment part 61 or the rear attachment part 66 by engaging the hook 91 with the hook engagement part 601. Is configured to do.

  In the present embodiment, the front mounting portion 61 and the rear mounting portion 66 are arranged from the left to the right of the hammer drill 101 in a state where the hook 91 is disposed on the left side and the guide rail 603 is engaged with the guide groove 93. It is comprised so that sliding engagement may be carried out. For this reason, the hook engaging portion 601 is arranged at the left end in the front mounting portion 61 and the rear mounting portion 66, and the battery connection terminal 605 is configured to connect to the terminal of the battery 9 from the right side. When the two batteries 9 are mounted on the battery mounting portion 6, the lower surfaces of the two batteries 9 are flush with each other. As shown in FIG. 2, the length of the battery 9 in the longitudinal direction (left-right direction) is longer than the length of the housing 10 (lower part 136) in the left-right direction. Therefore, the left and right end portions of the battery 9 protrude in the left-right direction from the lower portion 136 in the state where the battery is mounted on the battery mounting portion 6.

  Further, as shown in FIG. 1, in the outer surface portion of the lower portion 136, when the battery 9 is mounted on the battery mounting portion 6, at least one corner area of the lower end portion of the exposed portion of the battery 9. A battery protection unit 7 configured to protect 90 from external force is provided. Hereinafter, a detailed configuration of the battery protection unit 7 will be described.

  In the present embodiment, the battery protection unit 7 includes a front side protection unit 71 and a rear side protection unit 76 provided on both sides of the battery mounting unit 6 in the front-rear direction. The front protection part 71 and the rear protection part 76 are each formed as a part of the housing 10 (lower part 136). More specifically, each of the front protection part 71 and the rear protection part 76 is formed as a part of the lower part 136 that projects downward from the battery mounting part 6 with the battery mounting part 6 interposed therebetween. As shown in FIGS. 1 and 2, with respect to the vertical direction, the lower side of the front protection part 71 and the rear protection part 76 are substantially flush with the lower surface of the battery 9 attached to the battery attachment part 6. It is comprised so that it may become. Further, as shown in FIG. 2, the front protection part 71 and the rear protection part 76 both have substantially the same length as the motor housing part 111 and the upper part 133 in the left-right direction.

  In the present embodiment, the upper end portion of the battery 9 is mounted on the battery mounting portion 6, and the lower end portion is exposed below the battery mounting portion 6. Since the battery 9 is formed in a substantially rectangular parallelepiped shape, there are four corner regions 90 at the lower end (two on the left and right on the front side and two on the left and right on the rear side). Since two batteries 9 are mounted in the battery mounting portion 6 side by side in the front-rear direction, there are eight corner regions 90 as a whole.

  Of these eight corner regions 90, the two corner regions 90 at the rear lower end of the battery 9 (hereinafter simply referred to as the front battery 9) attached to the front attachment portion 61 and the rear attachment portion 66 The two corner regions 90 at the front lower end of the attached battery 9 (hereinafter simply referred to as the rear battery 9) are between the two batteries 9 arranged in the front-rear direction, and thus are less susceptible to external force. Compared to these, the two corner regions 90 at the front lower end portion of the front battery 9 and the two corner regions 90 at the rear lower end portion of the rear battery 9 have few portions that interfere with external force around. Therefore, it is easy to be exposed to external force. Therefore, the front protection part 71 and the rear protection part 76 are provided so as to protect the corner region 90 that is easily exposed to these external forces.

  Specifically, the front protection part 71 is configured to protect the two corner regions 90 at the front lower end of the front battery 9 from an external force. On the other hand, the rear side protection unit 76 is configured to protect the two corner regions 90 at the rear lower end of the rear battery 9 from external force. More specifically, the front protection portion 71 mainly interferes with external forces from the front (including the diagonal direction) toward the two corner regions 90 of the front lower end portion than the front protection portion 71, so that these corner portions Protect area 90. The rear side protection part 76 mainly interferes with an external force from the rear side (including the oblique direction) toward the two corner areas 90 of the rear side lower end part with respect to the rear side protection part 76, whereby these corner area 90. Protect.

  Since the two batteries 9 are mounted in a state where they are aligned in the front-rear direction, when the two batteries 9 are regarded as one battery group 900 having a substantially rectangular parallelepiped shape as a whole, the corner region 90 of the battery group 900 has 4 There are two corner regions 90 at the front lower end portion of the battery 9 attached to the front attachment portion 61 and two corner regions 90 at the rear lower end portion of the battery 9 attached to the rear attachment portion 66. I can say that. Therefore, the front protection unit 71 is configured to protect the two corner regions 90 at the front lower end portion of the battery group 900 mounted on the battery mounting unit 6 from external force, and the rear protection unit 76 is configured to protect the battery group 900. In other words, it can be said that the two corner regions 90 of the rear lower end portion are configured to be protected from external force. That is, it can be said that the battery protection unit 7 is configured to protect all the corner regions 90 at the lower end of the battery group 900 from an external force.

  Furthermore, the rear side protection part 76 is configured to effectively protect the corner area 90 from an impact at the time of dropping. Specifically, the center of gravity G of the hammer drill 101 (including an auxiliary handle (not shown)) when the two batteries 9 are mounted on the battery mounting portion 6, and the rear lower end portion of the rear battery 9 (of the battery group 900 When defining a virtual straight line connecting the corner region 90 of the rear lower end) and further defining a virtual plane orthogonal to the virtual straight line and passing through the corner region 90, the rear protection unit 76 It is formed so as to protrude in a direction away from the center of gravity G from the virtual plane.

  In general, the battery 9 is mounted and the center of gravity G is on the corner region 90 (in other words, the posture in which the center of gravity G is located directly above the corner region 90 or the hammer drill in the corner region 90) When the hammer drill 101 falls and the corner region 90 collides with the ground or the floor, the impact applied to the corner region 90 increases and the possibility of damage to the battery 9 increases. On the other hand, by forming the rear protection part 76 so as to protrude from the above-described virtual plane, the hammer drill 101 is in a state where the center of gravity G is on one of the two corner regions 90 of the rear lower end part. Even if it falls, the rear side protection part 76 contacts the ground or the floor first, so that the corner area 90 can be effectively protected.

  In addition, about the front side protection part 71, it is orthogonal to the virtual straight line which connects the gravity center G and the corner part area 90 of the front side lower end part (front side lower end part of the battery group 900) of the front side battery 9, and the corner area | region It does not protrude from a virtual plane passing through 90. However, since the lower surface of the front battery 9 protrudes from the virtual plane, when the hammer drill 101 falls with the center of gravity G on the corner region 90 at the front lower end, the lower surface of the battery 9 first comes first. Since it contacts the ground or floor, the corner area 90 that is more easily damaged can be protected.

  As described above, in the present embodiment, the housing 10 of the hammer drill 101 has a battery on the opposite side of the work axis A1 across the motor 2 in the extending direction (vertical direction) of the rotation axis A2 of the motor 2. A mounting portion 6 is provided. The battery mounting portion 6 is configured to be detachable with the two batteries 9 arranged in the front-rear direction. Furthermore, a battery protection part 7 including a front protection part 71 and a rear protection part 76 disposed on both sides of the battery mounting part 6 in the front-rear direction is provided on the outer surface of the housing 10.

  When the upper end portion of the battery 9 is mounted on the battery mounting portion 6, the corner region 90 at the lower end portion exposed to the outside is a portion that is easily damaged when an external force is applied compared to other regions. In particular, when the two batteries 9 are mounted in the front-rear direction as in the present embodiment, the two corner regions 90 at the front lower end of the front battery 9 and the rear battery 9 are The two corner regions 90 at the lower side of the side are easily exposed to external force and easily damaged. On the other hand, by providing the front side protection part 71 and the rear side protection part 76, these corner area | regions 90 can be protected from external force, and possibility that the battery 9 will be damaged can be reduced. In addition, the rear protection portion 76 that satisfies the relationship with the virtual plane described above can effectively protect the two corner regions 90 of the rear lower end portion of the rear battery 9 from the impact at the time of dropping.

  In the present embodiment, the battery protection unit 7 (the front protection unit 71 and the rear protection unit 76) is formed by a part of the housing 10. Therefore, the battery protection part 7 can be easily formed without increasing the number of parts. Furthermore, the battery protection unit 7 (front side protection unit 71 and rear side protection unit 76) has a lower surface attached to the battery mounting unit 6 (front side installation unit 61 and rear side installation unit 66). It is comprised so that it may become substantially flush. Therefore, the hammer drill 101 can be mounted in a stable posture on the ground or floor surface with the lower surface of the battery protection unit 7 and the lower surface of the battery 9 as the mounting surfaces.

  In the present embodiment, the hammer drill 101 is a configuration example corresponding to the “power tool” of the present invention. The motor 2 is a configuration example corresponding to a “motor”. The housing 10 is a configuration example corresponding to “housing”. The battery mounting unit 6 is a configuration example corresponding to the “battery mounting unit”. The battery 9 and the corner area 90 are configuration examples corresponding to “battery” and “corner area”, respectively. The battery protection unit 7 is a configuration example corresponding to the “battery protection unit” of the present invention, and the front protection unit 71 and the rear protection unit 76 correspond to the “front protection unit” and the “rear protection unit”, respectively. It is the example of a structure to do.

Second Embodiment
Hereinafter, the hammer drill 102 according to the second embodiment will be described with reference to FIGS. 3 and 4. The hammer drill 102 of this embodiment has substantially the same configuration as the hammer drill 101 of the first embodiment, except that the configuration of the lower portion 137 and the battery protection unit 70 is different from that of the first embodiment. Therefore, illustration and description of the same configuration are omitted, and different configurations are mainly described with reference to the drawings. This is the same in the third and subsequent embodiments.

  As shown in FIGS. 3 and 4, the battery protection unit 70 of the present embodiment includes a front side protection unit 72 and a rear side protection unit 77 as in the first embodiment. On the other hand, unlike the first embodiment, the battery protection unit 70 is formed as a member different from the housing 10 including the lower portion 137 and is attached to the lower portion 137. The lower portion 137 protrudes downward on the front side and the rear side of the battery mounting portion 6. And the front side protection part 72 and the rear side protection part 77 are attached so that these protrusion parts may be covered. In the present embodiment, the front protection part 72 and the rear protection part 77 are made of a material different from that of the housing 10. More specifically, in the present embodiment, the housing 10 is formed of polyamide resin in consideration of weight reduction and rigidity, while the battery protection unit 70 is formed of rubber in consideration of shock absorption. . The battery protection unit 70 is attached to the housing 10 by being integrally formed with the housing 10.

  The outer shape of the lower part 137 and the battery protection unit 70 is substantially the same as the outer shape of the lower part 136 including the battery protection unit 7 of the first embodiment. Therefore, similarly to the first embodiment, the front protection part 72 and the rear protection part 77 are configured such that the lower surfaces thereof are substantially flush with the lower surface of the battery 9 mounted on the battery mounting unit 6. In addition, the rear protection part 77 is orthogonal to a virtual straight line connecting the center of gravity G (see FIG. 1) and the corner area 90 of the rear lower end of the rear battery 9, and the corner area 90 is It is formed so as to protrude in a direction away from the center of gravity G rather than a virtual plane that passes through.

  According to the battery protector 70 of the present embodiment configured as described above, the front protector 72 and the rear protector 77 are respectively provided with two corner regions 90 at the front lower end of the battery 9 on the front side, The two corner regions 90 at the rear lower end of the rear battery 9 can be protected from external force, and the possibility of damage to the battery 9 can be reduced. Further, the corner region 90 is effectively protected from an impact when the hammer drill 102 falls with the center of gravity G placed on one of the two corner regions 90 at the rear lower end of the rear battery 9. be able to.

  In the present embodiment, the battery protection unit 70 is attached to the housing 10 as a separate member made of a material different from that of the housing 10 by integral molding. Thus, by forming the battery protection unit 70 as another member, the battery protection unit 70 can be appropriately provided while the housing 10 is kept in a simple shape. Moreover, the housing 10 and the battery protection part 70 can be formed with an appropriate material, respectively. When the battery protection unit 70 is a separate member from the housing 10 as in the present embodiment, the battery protection unit 70 is preferably formed of a material having a smaller elastic coefficient than the housing 10. Moreover, in this case, it is preferable to form not only rubber but the material which has elasticity.

  In the present embodiment, the battery protection unit 70 is a configuration example corresponding to the “battery protection unit” of the present invention, and the front side protection unit 72 and the rear side protection unit 77 are respectively “front side protection unit”, “ It is a structural example corresponding to a "back side protection part."

<Third Embodiment>
Hereinafter, the hammer drill 103 according to the third embodiment will be described with reference to FIG. The hammer drill 103 of the present embodiment also has substantially the same configuration as the hammer drill 101 (see FIG. 1) of the first embodiment, except that the configurations of the lower portion 138 and the battery protection unit 700 are different.

  As shown in FIG. 5, in the present embodiment, the front end portion of the lower portion 138 of the housing 10 is formed to protrude downward from the battery mounting portion 6, and the rear portion of the lower surface thereof is The step portion 731 is slightly recessed upward with respect to the front portion. On the other hand, the lower surface of the rear end portion of the lower portion 138 is substantially at the same position as the guide rail 603 of the battery mounting portion 6.

  A cover member 79 is fixed below the battery mounting portion 6. The cover member 79 is formed by bending a generally rectangular metal sheet metal so as to form an approximately L shape in a side view. The cover member 79 includes a lower surface portion 791 extending in a direction substantially orthogonal to the rotation axis A2 of the motor 2, a side surface portion 792 bending and extending in a direction substantially orthogonal to the lower surface portion 791 from the rear end of the lower surface portion 791, And an upper surface portion 793 that bends and extends in a direction substantially orthogonal to the side surface portion 792 from the rear end of the side surface portion 792. The front end portion of the lower surface portion 791 is fixed to the stepped portion 731 of the front protection portion 73 with a screw from below. Further, the upper surface portion is fixed to the rear end portion of the lower portion 138 with a screw from the lower side. Thereby, a battery housing space that is rectangular in a side view and penetrates in the left-right direction is formed between the battery mounting portion 6 and the cover member 79.

  The battery 9 is mounted on the battery mounting portion 6 by the guide groove 93 being slidably engaged with the guide rail 603 from the left to the right of the hammer drill 103, and is disposed in the battery accommodating space. At this time, the lower surface portion 791 is disposed to face the lower surface of the battery 9, and the side surface portion 792 is disposed to face the rear end surface of the battery 9 mounted on the rear mounting portion 66. Since the battery housing space is open on the left side, the battery 9 can be attached to and detached from the battery mounting portion 6 even when the cover member 79 is fixed.

  The battery protection unit 700 of the present embodiment includes a front side protection unit 73 and a rear side protection unit 78 disposed on both sides of the battery mounting unit 6 in the front-rear direction. As the front side protection part 73 and the rear side protection part 78, the structure corresponding to the combination of the front side protection part 71 of 1st Embodiment and the rear side protection part 77 of 2nd Embodiment is employ | adopted.

  Specifically, the front protection part 73 of the battery protection part 700 is formed as a part of the lower part 138, while the rear protection part 78 is formed of rubber as a separate member from the housing 10, Attached to portion 138. The front side protection part 73 is comprised by the front-end part formed so that it might protrude below the battery mounting part 6 among the lower side parts 138 as mentioned above. After the cover member 79 is fixed to the lower portion 138, the rear protection portion 78 is adhered to the rear side of the cover member 79 and the lower end portion of the lower portion 138. The front side protection part 73 and the rear side protection part 78 are configured such that their lower surfaces are flush with the lower surface part 791 of the cover member 79. In the left-right direction, as in the first and second embodiments, the left and right end portions of the battery 9 protrude in the left-right direction from the battery protection portion 700 when mounted on the battery mounting portion 6 (see FIG. 2).

  Further, as in the first and second embodiments, the rear protection portion 78 is orthogonal to a virtual straight line that connects the center of gravity G (see FIG. 1) and the corner region 90 of the rear lower end of the rear battery 9. In addition, it is formed so as to protrude in a direction away from the center of gravity G rather than a virtual plane passing through the corner region 90.

  According to the battery protector 700 of the present embodiment configured as described above, the front protector 73 and the rear protector 78 are respectively provided with two corner regions 90 at the front lower end of the front battery 9; The two corner regions 90 at the rear lower end of the rear battery 9 can be protected from external force, and the possibility of damage to the battery 9 can be reduced. In particular, the impact when the hammer drill 103 falls with the center of gravity G placed on one of the two corner regions 90 of the rear lower end portion of the rear battery 9 by the rubber rear side protection portion 78. Therefore, the corner region 90 can be effectively protected.

  Furthermore, since the lower surface of the battery protection unit 700 and the lower surface of the cover member 79 (lower surface portion 791) are flush with each other, the lower surface of the battery protection unit 700 and the lower surface of the cover member 79 regardless of whether or not the battery 9 is attached. Can be placed in a stable posture on the ground or floor. In addition, the cover member 79 can protect the battery 9 by interfering with an external force that is directed to the battery 9 mainly from below (including an oblique direction) the battery 9.

  In this embodiment, the battery protection unit 700 is a configuration example corresponding to the “battery protection unit” of the present invention, and the front side protection unit 73 and the rear side protection unit 78 are respectively “front side protection unit”, “ It is a structural example corresponding to a "back side protection part."

<Fourth embodiment>
Hereinafter, the hammer drill 104 according to the fourth embodiment will be described with reference to FIGS. 6 and 7. The hammer drill 104 of the present embodiment has substantially the same configuration as the hammer drill 101 (see FIG. 1) of the first embodiment, except that the configurations of the lower portion 139 and the battery protection unit 8 are different.

  As shown in FIG. 6, the hammer drill 104 of the present embodiment includes a housing 10, a motor 2 housed in the housing 10, a battery mounting portion 60 in which two batteries 9 are detachable, and an outer surface of the housing 10. And a battery protection unit 8 provided in the unit. The housing 10 includes a first housing part 11 that houses the motor 2 and the drive mechanism 3, and a second housing part 13 that is elastically connected to the first housing part 11.

  The lower portion 139 of the second housing portion 13 is disposed on the lower side of the motor 2 and has a battery mounting portion 60 at the lower end thereof. The battery mounting portion 60 of the present embodiment includes a front mounting portion 62 provided in the front portion of the lower end portion of the lower portion 139 and a rear mounting portion 67 provided in the rear portion.

  As shown in FIGS. 6 and 7, the front mounting portion 62 and the rear mounting portion 67 have the same configuration, and as in the first embodiment, a hook engaging portion 601, a pair of guide rails 603, a battery Connection terminal 605. On the other hand, unlike the battery first embodiment, the front mounting portion 62 is configured such that the battery 9 is mounted from the front side, and the rear mounting portion 67 is configured so that the battery 9 is mounted from the rear side. ing. Specifically, the guide rails 603 of the front mounting portion 62 and the rear mounting portion 67 each extend in the front-rear direction. Moreover, in the front side mounting part 62, the hook engaging part 601 is arrange | positioned in the front-end part, and the battery connection terminal 605 is comprised so that it may connect with the terminal of the battery 9 from back. In the rear mounting portion 67, the hook engaging portion 601 is disposed at the rear end portion, and the battery connection terminal 605 is configured to be connected to the terminal of the battery 9 from the front.

  The battery protection unit 8 according to the present embodiment includes a pair of front side protection portions 81 provided at the front end portion of the lower portion 139 and a pair of rear side protection portions 86 provided at the rear end portion. The pair of front protection parts 81 and the pair of rear protection parts 86 are each formed as a part of the lower part 139. Specifically, the pair of front side protection portions 81 are formed in a thin plate shape, face each other in the left-right direction across the front region of the front side mounting portion 62, and protrude downward from the front side mounting portion 62. Is arranged. Reinforcing ribs 801 are provided on the opposing surfaces of the pair of front side protection parts 81 and the pair of rear side protection parts 86. Further, the pair of rear side protection portions 86 are formed in a thin plate shape, and are arranged so as to face each other in the left-right direction across the rear region of the rear side mounting portion 67 and protrude downward from the front side mounting portion 62. Has been. When the battery 9 is attached to the battery attachment part 60, the pair of front side protection parts 81 and the pair of rear side protection parts 86 are respectively left and right of the front end part of the front battery 9 and the rear end part of the rear battery 9. Located on both sides.

  In the present embodiment, the pair of front side protection portions 81 and the pair of rear side protection portions 86 slightly protrude below the lower surface of the battery 9 when the battery 9 is attached to the battery attachment portion 60, and The lower surface is formed so as to be substantially flush.

  Further, in the present embodiment, the pair of left and right front protection portions 81 are respectively provided with the center of gravity G of the hammer drill 104 (including the auxiliary handle) when the battery 9 is mounted on the battery mounting portion 60 and the front side of the front battery 9. It is orthogonal to a virtual straight line connecting the left and right corner regions 90 of the lower end (the front lower end of the battery group 901), and protrudes in a direction away from the center of gravity G from a virtual plane passing through the corner region 90. It is formed to do. Similarly, the pair of left and right rear protection portions 86 connect the center of gravity G and the left and right corner regions 90 of the rear lower end portion of the rear battery 9 (the rear lower end portion of the battery group 901), respectively. It is formed so as to protrude in a direction away from the center of gravity G from a virtual plane that is orthogonal to the virtual straight line and passes through the corner region 90.

  According to the battery protection unit 8 of the present embodiment configured as described above, the pair of front protection units 81 is mainly on the front side from the left or right side (including the oblique direction) of the pair of front protection units 81. By interfering with the external force toward the two corner regions 90 at the lower end, these corner regions 90 can be protected. Further, the pair of rear protection portions 86 mainly interferes with the external force from the left or right side (including the oblique direction) toward the two corner regions 90 of the rear lower end than the pair of rear protection portions 86. By doing so, these corner regions 90 can be protected. That is, the possibility that the battery 9 is damaged can be reduced. In addition, the pair of front protection parts 81 and the pair of rear protection parts 86 prevent an impact when the hammer drill falls while the center of gravity G is on any one of the four corner regions 90 at the lower end of the battery group 901. The corner region 90 can be effectively protected.

  In addition, the lower surface of the pair of front side protection parts 81 and the pair of rear side protection parts 86 arranged at four locations so as to surround the battery group 901 is used as a mounting surface, and the hammer drill 104 is in a stable posture on the ground or floor surface. Can be placed.

  In the present embodiment, the battery protection unit 8 is a configuration example corresponding to the “battery protection unit” of the present invention, and the pair of front side protection units 81 and the pair of rear side protection units 86 are respectively “ It is a structural example corresponding to a "front side protection part" and "a pair of rear side protection part."

<Fifth Embodiment>
Hereinafter, with reference to FIG. 8, the hammer drill 105 which concerns on 5th Embodiment is demonstrated. The hammer drill 105 of this embodiment corresponds to a modification in which a wireless interlocking unit 711 is provided in the battery protection unit 7 of the hammer drill 101 (see FIG. 1) of the first embodiment.

  As shown in FIG. 8, the battery protection unit 7 of the present embodiment includes a front side protection unit 71 and a rear side protection unit 76 as in the first embodiment. That is, the front protection part 71 and the rear protection part 76 are each formed as a part of the housing 10 (lower part 136), and extend below the battery mounting part 6 on the front side and the rear side of the battery mounting part 6. Exist. With such a configuration, an internal space as an empty space is formed in the front protection part 71 and the rear protection part 76. Therefore, in the present embodiment, the wireless interlocking unit 711 is accommodated in the internal space of the front protection unit 71.

  The wireless interlocking unit 711 is an additional mechanism that exhibits a function different from the protection of the corner region 90 of the battery 9, and is configured to be able to perform wireless communication with an external device. In the present embodiment, the radio interlocking unit 711 uses a radio wave in a predetermined frequency band via an antenna (not shown) to a stationary dust collector separate from the hammer drill 105 in accordance with a control signal from the controller 5. It is configured to wirelessly transmit a predetermined interlocking signal. In addition, since such a system itself is publicly known, in brief explanation, the controller 5 is operated while the trigger 14 (see FIG. 1) is pressed and the switch 145 (see FIG. 1) is turned on. The wireless interlocking unit 711 is caused to transmit an interlocking signal. The controller of the dust collector is configured to drive the motor of the dust collector while receiving the interlocking signal transmitted from the wireless interlocking unit 711. That is, the user of the hammer drill 105 can operate the dust collector in conjunction with the hammer drill 105 only by pressing the trigger 14.

  According to the hammer drill 105 of the present embodiment configured as described above, the corner region 90 of the battery 9 can be protected from external force and the possibility of damage can be reduced, and the internal space of the battery protection unit 7 can be reduced. It is possible to realize the interlocking function with the dust collector by making effective use of. In the present embodiment, the wireless interlocking unit 711 is a configuration example corresponding to the “addition mechanism” of the present invention. Note that the wireless interlocking unit 711 may be accommodated in the internal space of the rear side protection unit 76 instead of the front side protection unit 71. The wireless interlocking unit 711 is not limited to transmitting an interlocking signal to the dust collector, and may be configured to perform wireless communication with other external devices (for example, portable terminals).

<Sixth Embodiment>
Hereinafter, the hammer drill 106 according to the sixth embodiment will be described with reference to FIG. 9. The hammer drill 106 of the present embodiment corresponds to a modification in which the USB terminal 712 is provided in the battery protection unit 7 of the hammer drill 101 (see FIG. 1) of the first embodiment.

  As shown in FIG. 9, also in this embodiment, the front side protection part 71 and the rear side protection part 76 are formed as a part of the housing 10 (lower part 136), respectively, and the front side and the rear side of the battery mounting part 6 are formed. Thus, it extends below the battery mounting portion 6. In this embodiment, two USB terminals 712 are arranged in the internal space of the front protection unit 71. The USB terminal 712 is an additional mechanism that exhibits a function different from the protection of the corner region 90 of the battery 9 and is configured to be electrically connectable to an external USB device (for example, a portable terminal). Thereby, for example, it is possible to charge the USB device connected via the USB terminal 712 using the battery 9 attached to the battery attachment unit 6.

  According to the hammer drill 106 of the present embodiment configured as described above, the corner region 90 of the battery 9 can be protected from external force and the possibility of damage can be reduced, and the internal space of the battery protection unit 7 can be reduced. The function of supplying power from the battery 9 to the USB device can be realized by effectively utilizing the above. Note that the USB terminal 712 may be accommodated in the internal space of the rear side protection unit 76 instead of the front side protection unit 71, and the number thereof may be one or three or more. Further, instead of the USB terminal 712, a connection terminal for an external device based on another communication standard may be provided. In the present embodiment, the USB terminal 712 is a configuration example corresponding to the “addition mechanism” of the present invention.

<Seventh embodiment>
Hereinafter, the hammer drill 107 according to the seventh embodiment will be described with reference to FIG. The hammer drill 107 of the present embodiment corresponds to a modification in which a distance sensor 713 is provided in the battery protection unit 7 of the hammer drill 101 (see FIG. 1) of the first embodiment.

  As shown in FIG. 10, also in this embodiment, the front side protection part 71 and the rear side protection part 76 are formed as a part of the housing 10 (lower part 136), respectively, and the front side and the rear side of the battery mounting part 6 are formed. Thus, it extends below the battery mounting portion 6. In the present embodiment, a distance sensor 713 is disposed in the internal space of the front protection part 71. The distance sensor 713 is an additional mechanism that exhibits a function different from the protection of the corner region 90 of the battery 9, and is configured to be able to measure a distance from an object within a predetermined detection range. In this embodiment, an infrared distance sensor 713 is employed, and light from an infrared light emitting diode is projected from a through-hole provided in the front wall portion of the front protection portion 71, and light reflected by an object is reflected. The distance is measured according to the incident position on the light receiving element.

  When the hammer drill 107 performs a drilling operation on the workpiece 19 by a drill operation, the difference between the measurement distance to the workpiece 19 at the start of the operation and the measurement distance during the operation is the depth of the formed hole. Generally corresponds to Therefore, for example, when the calculated depth of the hole reaches the depth set in advance by the user, the controller 5 stops the driving of the motor 2 (see FIG. 1) or the LED lamp (not shown). ) Or a buzzer or the like.

  According to the hammer drill 107 of the present embodiment configured as described above, the corner region 90 of the battery 9 can be protected from external force and the possibility of damage can be reduced, and the internal space of the battery protection unit 7 can be reduced. It is possible to realize the function of measuring the depth of the hole formed by the drilling operation by effectively utilizing the above. The distance measurement method of the distance sensor 713 is not limited to the above example, and any other method such as an ultrasonic method may be adopted. In the present embodiment, the distance sensor 713 is a configuration example corresponding to the “addition mechanism” of the present invention.

<Eighth Embodiment>
Hereinafter, with reference to FIG. 11, the hammer drill 108 which concerns on 8th Embodiment is demonstrated. The hammer drill 108 of the present embodiment corresponds to a modification in which the battery protection unit 7 of the hammer drill 101 (see FIG. 1) of the first embodiment is reinforced by the reinforcing members 803 and 805.

  As shown in FIG. 11, also in this embodiment, the front side protection part 71 and the rear side protection part 76 are formed as a part of the housing 10 (lower part 136), respectively, and the front side and the rear side of the battery mounting part 6 are formed. Thus, it extends below the battery mounting portion 6. In the present embodiment, metal reinforcing members 803 and 805 are provided inside the front protection part 71 and the rear protection part 76, respectively. More specifically, the reinforcing member 803 includes a front wall portion (a front wall portion of the lower portion 136), a bottom wall portion, and a rear wall portion (front side) among the wall portions of the lower portion 136 constituting the front protection portion 71. It is arranged along the inner surface of a wall portion extending downward from the front end portion of the mounting portion 61. Similarly, the reinforcing member 805 includes a front wall portion (a wall portion extending downward from the rear end portion of the rear mounting portion 66), a bottom, among the wall portions of the lower portion 136 constituting the rear protection portion 76. It arrange | positions along the inner surface of a wall part and a rear wall part (rear wall part of the lower part 136). The reinforcing members 803 and 805 may be fixed to the front protective portion 71 and the rear protective portion 76 by any method, but in this embodiment, the reinforcing members 803 and 805 are both the lower portion 136 and the lower portion 136. By being integrally formed, the front side protection part 71 and the rear side protection part 76 are fixed.

  According to the hammer drill 108 of the present embodiment configured as described above, since the front protection part 71 and the rear protection part 76 are reinforced by the reinforcing members 803 and 805, respectively, the front protection part 71 and the rear protection part When 76 receives external force, possibility that the front side protection part 71 and the rear side protection part 76 will be damaged can be reduced. Thereby, possibility that the battery 9 will be damaged can be reduced more reliably. In the present embodiment, each of the reinforcing members 803 and 805 is a configuration example corresponding to the “reinforcing member” of the present invention.

  Note that it is only necessary that at least a part of the reinforcing members 803 and 805 be disposed in the front protection part 71 and the rear protection part 76, respectively. For example, at least a part of the reinforcing members 803 and 805 may be fixed to the outer surfaces of the front protection part 71 and the rear protection part 76. From the viewpoint of reducing the possibility that the front side protection part 71 and the rear side protection part 76 projecting downward from the battery mounting part 6 will be broken at the root, as shown in FIG. 11, the reinforcing members 803 and 805 include at least one member. It is preferable that the portion extends above the battery mounting portion 6.

<Ninth Embodiment>
Hereinafter, the hammer drill 109 according to the ninth embodiment will be described with reference to FIGS. 12 and 13. The hammer drill 109 of this embodiment has substantially the same configuration as the hammer drill 101 (see FIG. 1) of the first embodiment, except that the configuration of the battery protection unit 80 is different. In the above-described embodiment, only the battery 9 having a capacity of 18 volts is illustrated as the battery that can be attached to and detached from the battery mounting unit 6, but the battery that can be attached to and detached from the battery mounting unit 6 is not limited to the battery 9 but has a capacity and size. There are different types. Therefore, in the present embodiment, the battery protection unit 80 is configured to be compatible with a plurality of types of batteries.

  As shown in FIG. 12, the battery protection unit 80 of the present embodiment includes a front protection unit 83 and a rear protection unit 88. The front side protection part 83 includes a base part 831 and an addition part 836 configured to be detachable from the base part 831. Similarly, the rear side protection part 88 includes a base part 881 and an addition part 886 configured to be detachable from the base part 881.

  The base parts 831 and 881 respectively correspond to the front protection part 71 and the rear protection part 76 of the first embodiment, and are formed as a part of the housing 10 (lower part 136). The front side and the rear side extend below the battery mounting portion 6. That is, the base portions 831 and 881 are configured such that when the battery 9 is mounted on the battery mounting portion 6, the lower surfaces of the base portions 831 and 881 and the lower surface of the battery 9 are substantially flush with each other. In addition, screw holes 832 and 882 are formed at the lower ends of the base portions 831 and 881, respectively.

  The additional portions 836 and 886 are configured to be fixed to the base portions 831 and 881 with screws 839 and 889 in a state where the upper surfaces thereof are in contact with the lower surfaces of the base portions 831 and 881, respectively. Specifically, stepped holes 837 and 887 penetrating in the vertical direction are formed in the additional portions 836 and 886, respectively. Screws 839 and 889 are inserted into the stepped holes 837 and 887 from below, and are screwed into the screw holes 832 and 882 of the base portions 831 and 881, whereby the additional portions 836 and 886 are fixed to the base portions 831 and 881. Is done. The additional portions 836 and 886 may be formed of the same material as the base portions 831 and 881 (that is, the housing 10), or may be formed of different materials as in the second embodiment. When the battery 903 is mounted on the battery mounting portion 6, the additional portions 836 and 886 are arranged so that the lower surfaces of the additional portions 836 and 886 fixed to the base portions 831 and 881 are substantially flush with the lower surface of the battery 903. It is configured. The battery 903 is a large-capacity battery whose height in the vertical direction is larger than that of the battery 9. The width in the front-rear direction and the length in the left-right direction of the battery 903 are the same as those of the battery 9.

  When the user uses the battery 9 as a power source, the user may use the hammer drill 109 in a state where the additional portions 836 and 886 are fixed to the base portions 831 and 881, or remove the screws 839 and 889. 836 and 886 may be used in a state where they are detached from the base portions 831 and 881. In either case, the battery protection unit 80 can protect the corner region 90 of the battery 9 from external force and reduce the possibility of the battery 9 being damaged. Further, by using the additional parts 836 and 886 detached from the base parts 831 and 881, the hammer drill 109 can be stably mounted on the ground or floor surface with the lower surfaces of the base parts 831 and 881 and the lower surface of the battery 9 as the mounting surfaces. It can be placed in the posture.

  On the other hand, when using the battery 903 as a power source, the user may fix the additional portions 836 and 886 to the base portions 831 and 881 and increase the height of the battery protection portion 80. Thereby, the battery protection unit 80 protects the corner region 90 of the battery 903 from an external force, and the possibility that the battery 903 is damaged can be reduced. Further, the hammer drill 109 can be placed in a stable posture on the ground or floor surface using the lower surfaces of the additional portions 836 and 886 and the lower surface of the battery 903 as the placement surfaces.

  Note that the battery 9 and the battery 903 have the largest width in the front-rear direction (left-right direction in FIG. 12) among the batteries that can be attached to and detached from the battery mounting unit 6. Therefore, in the battery protection unit 80, the distance in the front-rear direction between the front protection unit 83 and the rear protection unit 88 is set according to the batteries 9 and 903. This also applies to the battery protection units 7 (see FIG. 1), 70 (see FIG. 3), and 700 (see FIG. 5) of the above embodiment. As shown in FIG. 13, even when a small-capacity battery 904 having a smaller width in the front-rear direction than the batteries 9 and 903 is attached to the battery attachment portion 6, the battery protection portion 80 can It is possible to protect against external force and reduce the possibility of the battery 904 being damaged. Note that the vertical height and the horizontal length of the battery 904 are the same as those of the battery 9, and therefore the lower surfaces of the base portions 831 and 881 and the lower surface of the battery 904 are substantially flush with each other.

  According to the hammer drill 109 of the present embodiment configured as described above, the user can select the battery protection unit 80 according to the size of the battery mounted on the battery mounting unit 6 among a plurality of types of batteries having different sizes. The height in the vertical direction can be adjusted appropriately. Thereby, even if which battery is mounted | worn among several types of batteries from which size differs, the corner area | region 90 of a battery can be protected and the possibility of damage can be reduced. In this embodiment, the battery protection unit 80, the front side protection unit 83, and the rear side protection unit 88 correspond to the “battery protection unit”, “front side protection unit”, and “rear side protection unit” of the present invention, respectively. It is. Note that the additional portions 836 and 886 may be detachable from the base portions 831 and 881 by a method other than the screws 839 and 889.

  The above embodiment is merely an example, and the power tool according to the present invention is not limited to the configuration of the exemplified hammer drills 101 to 109. For example, the changes exemplified below can be added. It should be noted that only one or a plurality of these changes can be employed in combination with the hammer drills 101 to 109 shown in the embodiment or the invention described in the claims.

  The battery protection units 7, 70, 700, 8, and 80 exemplified in the above embodiment may be employed in electric tools other than the hammer drills 101 to 109. The electric tool is a general tool that is operated by using electric power supplied from a battery and used for work or the like. For example, any one of the battery protection units 7, 70, 700, 8, and 80 may be employed in a so-called rotating tool (for example, a shear wrench) configured to rotationally drive the final output shaft. In this case, the rotation axis of the final output shaft corresponds to the work axis A1.

  The configuration (shape, number, arrangement position, etc.) of the battery protection units 7, 70, 700, 8, 80 is such that the battery protection units 7, 70, 700, 8, 80 are at least one corner of the batteries 9, 903, 904. The region 90 can be changed as appropriate as long as the region 90 can be protected from external force. For example, in the first to third and fifth to ninth embodiments, the lower end position of the battery protection unit 7, 70, 700, 80 is lower than the lower surface of the battery 9, 903, 904 mounted on the battery mounting unit 6. You may arrange | position below. The width in the left-right direction of the battery protection units 7, 70, 700, 80 may be equal to or greater than the width in the left-right direction of the batteries 9, 903, 904. Further, in the fourth embodiment, the pair of front side protection portions 81 and the pair of rear side protection portions 86 may be connected to each other below the lower surface of the battery 9 by a reinforcing rod-like member or plate-like member.

  In the first to third and fifth to ninth embodiments, the front protection parts 71, 72, 73 and 83 are connected to the center of gravity G and the corner area 90 at the front lower end of the front batteries 9, 903 and 904. May be formed so as to protrude from a virtual plane passing through the corner region 90 and perpendicular to a virtual straight line connecting the two. In this case, even when the hammer drill falls in a state where the center of gravity G is on the corner region 90 of the front lower end, the front protective portions 71, 72, 73, 83 can prevent the corner region 90 of the front lower end from the impact. Can be effectively protected.

  The diameter of the tip tool 18 used is relatively large, and the hammer drills 101 to 109 (including the auxiliary handle) adopting the crank mechanism as the motion conversion mechanism 30 have a total weight of 6 kg with the two batteries 9 attached. It is a large electric tool that exceeds. As described above, since the battery 9 to be mounted has a capacity of 18 volts, the battery 9 itself is relatively heavy. Further, the total weight of the hammer drills 101 to 109 (including the auxiliary handle) with the two batteries 9 attached is more than five times the weight of the two batteries 9. In a large power tool with such a weight ratio, when the power tool falls, if the corner area collides with a floor or a desk with the center of gravity lying on the corner area of the battery, the battery is damaged when dropped. Is more likely. Therefore, in an electric tool in which the total weight of the electric tool including the battery exceeds five times the weight of the battery (particularly, an electric tool having a total weight of 6 kg or more when the battery is mounted), the battery protection unit It is orthogonal to the virtual straight line connecting the center of gravity of the power tool when mounted and the corner area of the battery, and is formed so as to protrude in a direction away from the center of gravity than the virtual plane passing through the corner area. Is particularly preferred.

  In the third embodiment, the cover member 79 attached to the lower portion 138 may not be provided. On the contrary, similar cover members may be attached to the lower portions 136, 137, and 139 of the first, second, and fourth to ninth embodiments.

  In the fourth embodiment, as in the second embodiment, all of the pair of front side protection portions 81 and rear side protection portions 86 are formed as separate members from the housing 10 (lower side portion 139) and attached to the housing 10. May be. Alternatively, as in the third embodiment, a part of the pair of front protection part 81 and rear protection part 86 is formed as a part of the housing 10 (lower part 139), and the remaining part is the housing 10 ( The lower portion 139) may be formed as a separate member and attached to the housing 10.

  The number of batteries 9, 903, and 904 that can be attached to and detached from the battery mounting portions 6 and 60 is not limited to two, and may be one or three or more. When a battery mounting part with one detachable battery 9, 903, 904 is used, the battery protection part is an end part (upper end part) on the side where the battery mounting part of the batteries 9, 903, 904 is mounted. It is sufficient that at least one of the corner regions 90 at the opposite end (lower end) is protected from external force, but it is more preferable that all are protected from external force. . In particular, it is preferable that the protection portion corresponding to the corner region 90 that is highly likely to receive an impact in a state where the center of gravity rides when falling is configured to protrude from the virtual plane described in the above embodiment. .

  Like the battery mounting portions 6 and 60, the plurality of batteries 9, 903 and 904 are arranged in a predetermined direction (for example, the extending direction of the work axis A1 (front-rear direction), the direction orthogonal to the work axis A1 and the rotation axis A2 (left-right direction). )), The batteries 9, 903 and 904 may be regarded as one battery group. In this case, battery protection configured to protect at least one corner region 90 of the end (lower end) opposite to the one end (upper end) attached to and detached from the battery mounting portion of the battery group from external force. It suffices if a part is provided.

  In the case of a battery group, it is more preferable that the battery protection unit is configured to protect all of the corner region 90 at the lower end as the entire battery group from external force. In other words, the battery protection unit is the battery 9 arranged at the end on the first direction side in the predetermined direction (the parallel direction of the batteries 9, 903, 904) among the plurality of batteries 9, 903, 904 constituting the battery group. The corner region 90 at the lower end of the first direction side of the battery 9 and the battery 9 disposed at the end on the second direction side opposite to the first direction in the predetermined direction among the plurality of batteries 9, 903, 904, It is preferable that the corner region 90 at the lower end portion on the second direction side of 903 and 904 is configured to be protected from external force.

  For example, when a plurality of batteries 9, 903, 904 having a substantially rectangular parallelepiped shape are attached and detached in a state where they are aligned in the front-rear direction, in the battery group, It is preferable to protect the two corner regions 90 and the two corner regions 90 at the rear lower end of the battery 9 disposed at the rearmost position. In this case, as in the first to third and fifth to ninth embodiments, the battery protection unit may include two portions that protect the two corner regions 90, respectively. As such, each may include four portions that protect one corner region 90. Further, the battery protection unit may be configured to protect the four corner regions with one or three parts. When a battery having a shape different from the rectangular parallelepiped shape is attached or detached, the configuration of the battery protection unit may be appropriately changed according to the number and position of the corner regions of the battery.

  Moreover, in the said embodiment, although the housing 10 containing the 1st housing part 11 and the 2nd housing part 13 which were elastically connected so that relative movement was possible was illustrated, the housing 10 is not necessarily comprised as what is called a vibration-proof housing. There is no need to be done. Even when a vibration-proof housing structure is employed, the configuration can be changed as appropriate. For example, the lower portions 136, 137, 138, and 139 are formed integrally with the motor housing portion 111 as a part of the first housing portion 11, and the second housing portion 13 including the grip portion 131 and the upper portion 133 is formed. The first housing part 11 may be elastically connected to be movable relative to the first housing part 11. In this case, the battery protection units 7, 70, 700, 8, and 80 may be provided in the first housing unit 11 instead of the second housing unit 13. As in the above-described embodiment, in the vibration-proof housing, the battery mounting portion and the battery protection portion are connected to the second housing that is elastically connected to the first housing in which the vibration source (the motor 2 and the drive mechanism 3) is accommodated. When provided, it is preferable in that chattering prevention and the effect of improving the vibration isolation effect can be obtained.

Furthermore, in view of the gist of the present invention and the above embodiment, the following aspects are constructed. The following modes may be employed in combination with the hammer drills 101 to 109 shown in the embodiment, the above-described modified examples, or the invention described in each claim.
<Aspect 1>
When the power tool is arranged so that the working shaft extends in the horizontal direction and the rotating shaft extends in the vertical direction, the battery mounting portion is arranged on the lower side with respect to the motor,
The battery mounting portion is configured such that an upper end portion of a battery group including the at least one battery is mounted on the battery mounting portion, and a lower end portion of the battery group is exposed from the housing.
The battery protection unit may be configured to protect all corner regions of the lower end of the battery group from an external force.
<Aspect 2>
When the power tool is arranged so that the working shaft extends in the horizontal direction and the rotating shaft extends in the vertical direction, the battery mounting portion is arranged on the lower side with respect to the motor,
The battery mounting portion is configured such that upper ends of a plurality of batteries arranged in a predetermined direction are mounted on the battery mounting portion, and lower ends of the plurality of batteries are exposed from the housing,
The battery protection unit includes: a corner area of a lower end portion on the first direction side of a battery arranged at an end on the first direction side in the predetermined direction, and the battery in the predetermined direction; The corner region of the lower end portion on the second direction side of the battery arranged at the end on the second direction side opposite to the first direction in the predetermined direction may be protected from external force. .
<Aspect 3>
In aspect 2,
The predetermined direction is the front-rear direction,
The battery protection unit includes a corner area of a front lower end portion of a battery arranged in the forefront among the plurality of batteries, and a rear lower end portion of the battery arranged at the rearmost among the plurality of batteries. The corner area may be protected from external force.
<Aspect 4>
The power tool is a power tool in which the total weight including the battery when the battery is mounted on the battery mounting portion exceeds five times the weight of the battery,
The battery protection unit is orthogonal to a virtual straight line connecting the center of gravity of the electric tool and the corner region when the battery is mounted on the battery mounting unit, and more than a virtual plane passing through the corner region. , And may be formed so as to protrude in a direction away from the center of gravity.
<Aspect 5>
In aspect 4,
The power tool is a striking tool configured to be detachable with a tip tool, and configured to drive the tip tool linearly along the work axis via a striking element, and A crank mechanism may be provided that is housed and configured to convert the rotational power of the motor into a linear motion and transmit the linear motion to the striker.
<Aspect 6>
The battery protection unit includes a rear side protection unit disposed on the rear side with respect to the battery mounting unit in the front-rear direction,
The rear protection unit is orthogonal to a virtual straight line connecting the center of gravity of the electric tool and the corner region when the battery is mounted on the battery mounting unit, and from a virtual plane passing through the corner region. Alternatively, it may be formed so as to protrude in a direction away from the center of gravity.

101, 102, 103, 104, 105, 106, 107, 108, 109: Hammer drill 2: Motor 25: Motor shaft 29: Drive gear 3: Drive mechanism 30: Motion conversion mechanism 31: Crank shaft 32: Connecting rod 33: Piston 34: tool holder 35: cylinder 36: striking element 361: striker 363: impact bolt 365: air chamber 38: rotation transmission mechanism 4: mode switching dial 41: first spring 42: second spring 46: upper sliding portion 47: Lower sliding portion 5: controller 6, 60: battery mounting portion 61, 62: front mounting portion 66, 67: rear mounting portion 601: hook engaging portion 603: guide rail 605: battery connection terminals 7, 70, 700 8, 80: Battery protection units 71, 72, 73, 81, 83: Front side protection units 76, 77, 78, 86, 8: Rear side protection part 831, 881: Base part 832, 882: Screw hole 836, 886: Additional part 837, 887: Stepped hole 839, 889: Screw 711: Wireless interlocking unit 712: USB terminal 713: Distance sensor 731 : Stepped portion 801: Reinforcing ribs 803 and 805: Reinforcing member 79: Cover member 791: Lower surface portion 792: Side surface portion 793: Upper surface portions 9, 903 and 904: Battery 90: Corner region 91: Hook 93: Guide groove 95: Button 900, 901: Battery group 10: Housing 11: First housing part 111: Motor housing part 117: Drive mechanism housing part 13: Second housing part 131: Grasping part 133: Upper part 134: Barrel part 136, 137, 138 139: Lower part 14: Trigger 145: Switch 18: Tip tool A1: Work axis A2: Rotating axis : Center of gravity

Claims (12)

An electric tool,
A motor having a rotating shaft extending in a direction intersecting with a work axis extending in the front-rear direction of the electric tool;
A housing for housing the motor;
A battery mounting portion configured to be detachable from at least one battery, wherein the battery is provided in the housing, and is disposed on the opposite side of the work shaft with the motor interposed in an extending direction of the rotating shaft. A mounting part;
A battery protection part provided on the outer surface of the housing,
In the battery mounting portion, in the extending direction of the rotating shaft, one end of the at least one battery is mounted on the battery mounting portion, and an opposite end of the battery is exposed from the housing. Configured,
The battery protection unit is configured to protect at least one corner region of the opposite end of the at least one battery from an external force when the one end is mounted on the battery mounting unit. An electric tool characterized by that. The electric tool according to claim 1,
The battery protection unit is formed by a part of the housing. The electric tool according to claim 1,
The battery protection unit is formed as a member different from the housing, and is attached to the housing. The electric tool according to claim 3,
The battery protection unit is formed of a material different from that of the housing. The electric tool according to any one of claims 1 to 4,
The electric power tool characterized in that the battery protection part includes a front side protection part and a rear side protection part respectively disposed on both sides of the battery mounting part in the front-rear direction. The electric tool according to any one of claims 1 to 4,
The battery protection unit is formed on a pair of front protection units disposed on both sides of a front region of the battery mounting unit and on both sides of a rear region of the battery mounting unit in a direction intersecting the work shaft and the rotation shaft. A power tool comprising a pair of rear side protection portions arranged. The electric tool according to any one of claims 1 to 6,
The battery mounting unit is configured to be detachable with a plurality of batteries arranged in the front-rear direction. The electric tool according to any one of claims 1 to 7,
When the power tool is arranged so that the working shaft extends in the horizontal direction and the rotating shaft extends in the vertical direction, the battery mounting portion is arranged on the lower side with respect to the motor,
The battery protection unit is configured such that a lower surface of the battery protection unit is configured to be substantially flush with a lower surface of the battery when mounted on the battery mounting unit. The electric tool according to any one of claims 1 to 8,
The battery protection unit is orthogonal to a virtual straight line connecting the center of gravity of the electric tool and the corner region when the battery is mounted on the battery mounting unit, and more than a virtual plane passing through the corner region. The power tool is formed so as to protrude in a direction away from the center of gravity. The electric tool according to any one of claims 1 to 9,
An electric tool, further comprising an additional mechanism disposed in an internal space of the battery protection unit and configured to exhibit a function different from the protection of the corner region. A power tool according to any one of claims 2 and 5-10,
The part of the housing forming the battery protection part is made of resin,
The electric power tool further comprising a metal reinforcing member at least partially disposed on the battery protection unit. The electric tool according to any one of claims 1 to 11,
A plurality of types of batteries having different lengths in the extending direction of the rotating shaft can be selectively attached to and detached from the battery mounting portion,
The battery protection unit is configured to be capable of adjusting a length of the rotating shaft in the extending direction.

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