JP6831742B2 - Electric tool - Google Patents

Description

The present invention relates to a power tool configured so that a battery can be attached and detached.

Various power tools powered by rechargeable batteries are known. For example, Patent Document 1 describes a striking tool that linearly operates a tool bit on a striking shaft extending in the front-rear direction, and is connected to a tool body accommodating a motor and a rear end portion of the tool body in the vertical direction. A striking tool with a hand grip extending to is disclosed. The tool 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.

Japanese Unexamined Patent Publication No. 2014-148014

Unlike the above-mentioned striking tool, when the battery mounting position is set downward instead of behind the motor, the entire battery is typically exposed to the outside of the tool body except for the mounting point on the tool body above the battery. It's easy to get rid of. Therefore, if an external force is applied to the battery for some reason such as dropping, the battery is more likely to be damaged. Therefore, when such a battery mounting position is adopted, it is desired to take measures against damage to the exposed portion of the battery from the tool body (housing).

An object of the present invention is to provide a technique that contributes to measures against damage to an exposed portion of a battery in a power tool having a detachable battery.

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

The motor has a rotating shaft extending in a direction intersecting a working shaft extending in the front-rear direction of the power tool. The housing houses the motor. The battery mounting portion is configured so that at least one battery can be attached and detached. Further, the battery mounting portion is provided in the housing and is arranged on the side opposite to the working shaft with the motor in the extending direction of the rotating shaft of the motor. The battery protection unit is provided on the outer surface of the housing. The battery mounting portion is configured such that at least one end of the 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 protector is configured to protect at least one corner area of the opposite end of at least one battery from external forces when one end of the battery is mounted on the battery mount.

The above-mentioned "power tool" refers to a general tool that operates using electric power supplied from a battery and is used for work or the like. Further, the "working shaft" of the power tool corresponds to, for example, the driving shaft of the striking tool in a so-called striking tool (for example, a hammer drill) configured to drive the striking element 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 rotary shaft of the final output shaft.

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

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 the corners are chamfered). In the case of a battery having a substantially rectangular parallelepiped shape, the corner region may be paraphrased as the region corresponding to the apex of the rectangular parallelepiped. In addition, "exposed from the housing" can be rephrased as being arranged outside the housing and being exposed to the outside in an open manner.

When one end of the battery is mounted on the battery mounting portion, the corner region of the opposite end portion exposed to the outside is a portion that is more susceptible to damage when an external force is applied than the other regions. On the other hand, in the power tool of this embodiment, the battery protection portion can protect at least one corner region of the opposite end portion of the battery from an external force and reduce the possibility of damaging the battery.

According to one aspect of the invention, the battery protector may be formed by a portion of the housing. According to this aspect, the battery protection unit can be easily formed without increasing the number of parts.

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 of attaching the battery protection portion to the housing is not particularly limited. For example, a battery protection portion formed in advance of the same material as the housing or a different material is adhered to the housing, fixed with screws, and sandwiched. It may be attached by a method such as. Alternatively, the battery protection portion made of a material different from the housing may be integrally molded with the housing and attached to the housing. According to this aspect, it is possible to increase the degree of freedom in designing the battery protection unit while keeping the housing in a simple shape.

According to one aspect of the invention, the battery protector may be made of a different material than the housing. According to this aspect, the housing and the battery protector 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 arranged on both sides of the battery mounting portion in the front-rear direction. According to this aspect, by providing two protection portions (front protection portion and rear protection portion) on the front side and the rear side of the battery mounting portion, the corner regions arranged on the front side and the rear side are arranged. The corner area can be protected from external force.

According to one aspect of the present invention, the battery protection portion includes a pair of front protection portions arranged on both sides of the front region of the battery mounting portion and a rear portion of the battery mounting portion in a direction intersecting the work axis and the rotation axis. It may include a pair of rear protections arranged on both sides of the region. By providing protection portions on both sides of the front region and the rear region of the battery mounting portion, it is possible to protect the corner region arranged on the front side and the corner region arranged on the rear side from external force. ..

According to one aspect of the present invention, the battery mounting portion may be configured such that a plurality of batteries are detachably attached in a state of being arranged in the front-rear direction. According to this aspect, the power tool can exhibit higher output by using a plurality of batteries mounted on the battery mounting portion as compared with the power tool that can mount only one battery.

According to one aspect of the present invention, 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 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 it is mounted on the battery mounting portion. According to this aspect, the power tool can be mounted on the ground or the floor in a stable posture with the lower surface of the battery protection unit and the lower surface of the battery as the mounting 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 power tool and the corner region when the battery is mounted on the battery mounting portion, and passes through the corner region. It may be formed so as to project in a direction away from the center of gravity rather than a flat surface. Generally, when the power tool is dropped with the battery installed, the center of gravity of the power tool is in the corner area (in other words, the center of gravity is located directly above the corner area). Alternatively, if the corner region collides with the ground or floor (with the full weight of the power tool acting on the corner region), the impact on the corner region is increased and the possibility of damage is increased. On the other hand, according to this aspect, by forming the battery protection portion so as to protrude from the virtual plane, the battery protection portion can be formed even when the power tool falls with the center of gravity on the corner region. Since it collides with the ground or floor first, the corner area can be effectively protected.

According to one aspect of the invention, the power tool may further include an additional mechanism that is located in the internal space of the battery protection and is configured to perform a function different from the protection of the corner area 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, which tends to be an empty space.

According to one aspect of the present invention, a part of the housing forming the battery protection part is made of resin, and the power tool further includes a metal reinforcing member in which at least a part is arranged in the battery protection part. You may. According to this aspect, when the battery protection unit receives an external force, the possibility that the battery protection unit is damaged can be reduced. This can more reliably reduce the possibility of battery damage.

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 protecting portion extends the rotating shaft. It may be configured so that the length in the direction can be adjusted. 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. As a result, the corner area of the mounted battery can be appropriately protected.

It is a vertical sectional view of the hammer drill which concerns on 1st Embodiment. It is explanatory drawing which shows the hammer drill in the state which a part of the housing was removed from the rear view. It is a vertical cross-sectional view of a part of the hammer drill which concerns on 2nd Embodiment. It is a rear view of a part of a hammer drill. It is a vertical cross-sectional view of a part of the hammer drill which concerns on 3rd Embodiment. It is a vertical 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 vertical cross-sectional view of a part of the hammer drill which concerns on 5th Embodiment. It is a vertical cross-sectional view of a part of the hammer drill which concerns on 6th Embodiment. It is a vertical sectional view of the hammer drill which concerns on 7th Embodiment. It is a vertical cross-sectional view of a part of the hammer drill which concerns on 8th Embodiment. It is a vertical cross-sectional view of a part of the hammer drill which concerns on 9th Embodiment. It is another vertical sectional view of a part of the hammer drill which concerns on 9th Embodiment.

Hereinafter, embodiments will be described with reference to the drawings. In the following embodiment, a hammer drill will be illustrated as an example of a power 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 operation) and to rotate the tip tool 18 around the work axis A1 (drill). Operation) is configured to perform.

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

The first housing portion 11 includes a motor accommodating portion 111 accommodating the motor 2 and a drive mechanism accommodating portion 117 accommodating a drive mechanism 3 configured to drive the tip tool 18 by the power of the motor 2. It is formed in a substantially L shape. The drive mechanism accommodating portion 117 is formed in a long shape extending in the working shaft A1 direction. A tool holder 34 is provided at one end of the drive mechanism accommodating portion 117 in the working shaft A1 direction so that the tip tool 18 can be attached and detached. The motor accommodating portion 111 is connected and fixed so as not to be relatively movable with respect to the drive mechanism accommodating portion 117 at the other end of the drive mechanism accommodating portion 117 in the working shaft A1 direction, intersects the working shaft A1, and crosses the working shaft. It is arranged so as to protrude in the direction away from A1. In the motor accommodating portion 111, the motor 2 is arranged so that the rotation shaft A2 of the motor shaft 25 extends in the direction orthogonal to the work shaft A1.

In the following description, for convenience, the working axis A1 direction of the hammer drill 101 is defined as the front-rear direction of the hammer drill 101, one end side on which 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 shaft 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 portion 131 is a portion that is configured to be grippable by an operator and is arranged so as to extend in the rotation axis A2 direction (that is, the vertical direction) of the motor shaft 25. More specifically, the grip portion 131 extends in the vertical direction so as to be separated 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 arranged below the motor accommodating portion 111. A battery mounting portion 6 is provided at the lower end portion of the central portion of the lower portion 136 in the front-rear direction. The hammer drill 101 operates by the electric power supplied from the battery 9 mounted on the battery mounting portion 6.

With the above configuration, in the hammer drill 101, in addition to the second housing portion 13, the motor accommodating portion 111 of the first housing portion 11 is exposed to the outside in a state of being sandwiched between the upper portion 133 and the lower portion 136 from above and below. The outer surface of the hammer drill 101 is formed.

Hereinafter, the 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 accommodating the motor 2 and the drive mechanism 3 so as to be relatively movable. Vibration transmission from the 1 housing portion 11 to the 2nd housing portion 13 (particularly, the grip portion 131) is suppressed.

More specifically, as shown in FIG. 1, a pair of left and right first springs 41 are arranged between the drive mechanism accommodating 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 arranged between the motor accommodating portion 111 of the first housing portion 11 and the lower portion 136 of the second housing portion 13. In the present embodiment, the first spring 41 and the second spring 42 are composed of compression coil springs, and the grip portion 131 holds the first housing portion 11 and the second housing portion 13 in the working axis A1 direction. It is urged away from the housing portion 11.

Further, 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 accommodating portion 111 are formed as sliding surfaces that can slide in the work axis A1 direction in a state of being in contact with each other, and the upper sliding portion 46 is formed. Configure. Further, the upper surface of the lower portion 136 and the lower end surface of the motor accommodating portion 111 are formed as sliding surfaces that can slide in the work axis A1 direction in a state of 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 sliding guides that guide the first housing portion 11 and the second housing portion 13 so as to move relative to each other in the work axis A1 direction. As a result, it is possible to effectively suppress the vibration in the working axis A1 direction, which is the largest and dominant among the vibrations generated when the striking motion is performed, from being transmitted to the grip portion 131.

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

As shown in FIG. 1, of the first housing portion 11, the motor accommodating portion 111 is formed in a bottomed rectangular cylinder with an open upper side. The drive mechanism accommodating portion 117 is connected and fixed so as not to be relatively movable with respect to the motor accommodating portion 111 in a state where the lower end portion of the rear side portion is arranged in the upper end portion of the motor accommodating portion 111. In the present embodiment, the motor accommodating portion 111 accommodates a small, high-output brushless motor as the motor 2. 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 projects into the drive mechanism accommodating portion 117, and the drive gear 29 is formed in this portion.

Among the first housing portions 11, the drive mechanism accommodating portion 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 this embodiment, a crank mechanism is adopted as the motion conversion mechanism 30. More specifically, the motion conversion mechanism 30 includes a crankshaft 31, an articulated rod 32, a piston 33, and a cylinder 35. The crankshaft 31 is arranged parallel to the motor shaft 25 at the rear end of the drive mechanism accommodating portion 117. The crankshaft 31 has a driven gear that meshes with the drive gear 29 and an eccentric pin. One end of the articulating rod 32 is connected to the eccentric pin, and the other end is connected to the piston 33 via the connecting pin. The piston 33 is slidably arranged in the cylindrical cylinder 35. The cylinder 35 is coaxially connected and fixed to the rear portion of the tool holder 34 arranged in the tip region of the drive mechanism accommodating portion 117. When the motor 2 is driven, the piston 33 is reciprocated in the cylinder 35 in the working shaft A1 direction.

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

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. Therefore, the striker 361 is pushed forward at high speed and collides with the impact bolt 363, and kinetic energy is transmitted to the tip tool 18. As a result, the tip tool 18 is driven linearly along the work axis A1 and hits the workpiece. On the other hand, when the piston 33 is moved rearward, the air in the air chamber 365 expands and the internal pressure decreases, and the striker 361 is pulled in rearward. The hammer drill 101 performs a striking motion by causing the motion conversion mechanism 30 and the striking element 36 to repeat such an motion.

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 rotation power of the motor 2 is appropriately decelerated and then transmitted to the tool holder 34. A meshing type clutch is arranged on the power transmission path of the rotation transmission mechanism 38. When the clutch is placed in the engaged state, 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 rotationally driven around the work shaft A1. Will be done. On the other hand, when the engaged state of the clutch is released, the power transmission to the tool holder 34 by the rotation transmission mechanism 38 is cut off, and the tip tool 18 is not rotationally driven.

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

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

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

A trigger 14 that can be pressed by an operator is provided on the front portion of the grip portion 131. Inside the grip portion 131 formed in a tubular shape, a switch 145 that can be switched between an on state and an off state according to the operation of the trigger 14 is provided.

The lower portion 136 is formed in a rectangular box shape with a partially open upper side, and is arranged below the motor accommodating portion 111. A controller 5 is arranged inside the lower portion 136. The controller 5 is electrically connected to the motor 2, the switch 145, the battery mounting portion 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 trigger 14 pressing operation is released, and the switch 145 is pressed. When it is in the off state, the energization of 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 of the lower portion 136 in the front-rear direction. In the present embodiment, the battery mounting portions 6 are arranged side by side in the front-rear direction and include two mounting portions having the same configuration. In the following, of the two mounting portions, the mounting portion arranged on the front side is referred to as a front mounting portion 61, and the mounting portion arranged 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 batteries 9 can be attached to and detached from the battery mounting portion 6 in a state of being arranged in the front-rear direction. Therefore, the hammer drill 101 can exhibit higher output than the hammer drill to which only one battery 9 can be mounted. The battery 9 that can be attached to and detached from the hammer drill 101 of 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 has a hook 91, a terminal (not shown), a pair of guide grooves 93, and a button 95. For convenience of explanation, the vertical direction of the battery 9 is defined while it 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 of the battery 9 in the longitudinal direction (orthogonal direction on the paper surface in FIG. 1 and left-right direction in FIG. 2) so as to always project upward from the upper surface, and the battery. It is configured to retract downward from the upper surface by pressing the button 95 provided on the side surface of 9. 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 arranged 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 in a state where a part of the battery 9 is exposed on the lower side thereof. It is configured as follows. Specifically, each of the front mounting portion 61 and the rear mounting portion 66 has a hook engaging portion 601, a pair of guide rails 603, and a battery connection terminal 605.

The hook engaging portion 601 is a recess recessed upward, and is configured so that the hook 91 of the battery 9 can be engaged. 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 hook 91 engages with the hook engaging portion 601 and the battery 9 is mounted on the front mounting portion 61 or the rear mounting portion 66. It is configured to do.

In the present embodiment, the front mounting portion 61 and the rear mounting portion 66 are arranged from the left side to the right side of the hammer drill 101 with the hook 91 arranged on the left side and the guide rail 603 engaged with the guide groove 93. It is configured to be slid-engaged towards. Therefore, the hook engaging portion 601 is arranged at the left end portion of 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 portion 136) in the left-right direction. Therefore, in the state of being mounted on the battery mounting portion 6, the left and right end portions of the battery 9 project in the left-right direction from the lower portion 136.

Further, as shown in FIG. 1, the outer surface portion of the lower portion 136 has at least one corner region of the lower end portion of the exposed portion of the battery 9 when the battery 9 is mounted on the battery mounting portion 6. A battery protection unit 7 configured to protect the 90 from an external force is provided. Hereinafter, the 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 portion 71 and the rear protection portion 76 are each formed as a part of the housing 10 (lower portion 136). More specifically, the front protection portion 71 and the rear protection portion 76 are each formed as portions of the lower portion 136 that project downward from the battery mounting portion 6 with the battery mounting portion 6 in between. As shown in FIGS. 1 and 2, in the vertical direction, the lower surfaces of the front protective portion 71 and the rear protective portion 76 are substantially flush with the lower surface of the battery 9 mounted on the battery mounting portion 6, respectively. It is configured to be. Further, as shown in FIG. 2, in the left-right direction, both the front side protection portion 71 and the rear side protection portion 76 have substantially the same length as the motor accommodating portion 111 and the upper portion 133.

In the present embodiment, the upper end portion of the battery 9 is attached to 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 the two batteries 9 are mounted side by side in the front-rear direction on the battery mounting portion 6, there are eight corner regions 90 as a whole.

Of these eight corner regions 90, the two corner regions 90 at the lower end of the rear side of the battery 9 mounted on the front mounting portion 61 (hereinafter, simply referred to as the front battery 9) and the rear mounting portion 66. Since the two corner regions 90 at the lower end of the front side of the mounted battery 9 (hereinafter, simply referred to as the rear battery 9) are located between the two batteries 9 arranged in the front-rear direction, they are less likely to receive an external force. Compared to these, the two corner regions 90 at the front lower end of the front battery 9 and the two corner regions 90 at the rear lower end of the rear battery 9 have less parts that interfere with external forces around them. Therefore, it is easily exposed to external force. Therefore, the front protection portion 71 and the rear protection portion 76 are provided so as to protect the corner region 90 that is easily exposed to these external forces.

Specifically, the front protection portion 71 is configured to protect the two corner regions 90 of the front lower end portion of the front battery 9 from an external force. On the other hand, the rear protection portion 76 is configured to protect the two corner regions 90 of the rear lower end portion of the rear battery 9 from an external force. More specifically, the front protection portion 71 interferes with an external force mainly from the front of the front protection portion 71 toward the two corner regions 90 of the front lower end portion (including the oblique direction), thereby causing these corner portions. Protect area 90. The rear protection portion 76 mainly interferes with an external force toward the two corner regions 90 of the rear lower end portion (including the oblique direction) from the rear of the rear protection portion 76, thereby causing these corner regions 90. To protect.

Since the two batteries 9 are mounted side by side in the front-rear direction, if the two batteries 9 are regarded as one battery group 900 having a substantially rectangular parallelepiped shape as a whole, the corner area 90 of the battery group 900 is 4. There are two (two corner regions 90 at the lower end of the front side of the battery 9 mounted on the front mounting portion 61 and two corner regions 90 at the lower end of the rear side of the battery 9 mounted on the rear mounting portion 66). It can be said that it does. Therefore, the front side protection unit 71 is configured to protect the two corner regions 90 of the front lower end portion of the battery group 900 mounted on the battery mounting unit 6 from external force, and the rear side protection unit 76 is configured to protect the battery group 900. In other words, it is configured to protect the two corner regions 90 of the rear lower end portion from an external force. That is, it can be said that the battery protection unit 7 is configured to protect all corner regions 90 at the lower end of the battery group 900 from external forces.

Further, the rear protection portion 76 is configured to effectively protect the corner region 90 from an impact particularly when dropped. Specifically, the center of gravity G of the hammer drill 101 (including the 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 a virtual straight line connecting the corner region 90 of the rear lower end) is defined, and a virtual plane orthogonal to the virtual straight line and passing through the corner region 90 is defined, the rear protection portion 76 It is formed so as to project in a direction away from the center of gravity G from this virtual plane.

Generally, the battery 9 is mounted and the center of gravity G is on the corner region 90 (in other words, the center of gravity G is located directly above the corner region 90, or the hammer drill is in the corner region 90. When the hammer drill 101 falls and the corner region 90 collides with the ground or the floor (with the entire weight of the 101 acting), 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 portion 76 so as to protrude from the above virtual plane, the hammer drill 101 can be placed in a state where the center of gravity G is placed on any of the two corner regions 90 at the lower end portion of the rear side. Even if it falls, the rear protection portion 76 comes into contact with the ground or the floor first, so that the corner region 90 can be effectively protected.

The front protection portion 71 is orthogonal to a virtual straight line connecting the center of gravity G and the corner region 90 of the front lower end portion (front lower end portion of the battery group 900) of the front battery 9, and the corner region region thereof. It does not protrude from the virtual plane passing through 90. However, since the lower surface of the battery 9 on the front side protrudes from the virtual plane, when the hammer drill 101 falls with the center of gravity G on the corner region 90 at the lower end of the front side, the lower surface of the battery 9 comes first. It can protect the more vulnerable corner area 90 due to contact with the ground and floor.

As described above, in the present embodiment, the housing 10 of the hammer drill 101 has a battery on the side opposite to the working shaft A1 with the motor 2 sandwiched in the extending direction (vertical direction) of the rotating shaft 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 side by side in the front-rear direction. Further, the outer surface portion of the housing 10 is provided with a battery protection portion 7 including a front side protection portion 71 and a rear side protection portion 76 arranged on both sides of the battery mounting portion 6 in the front-rear direction.

When the upper end portion of the battery 9 is attached to the battery mounting portion 6, the corner region 90 of the lower end portion exposed to the outside is a portion that is more susceptible to damage when an external force is applied than the other regions. In particular, when the two batteries 9 are mounted side by side in the front-rear direction as in the present embodiment, the two corner regions 90 at the lower end of the front side of the front battery 9 and the rear side of the battery 9 are rearward. The two corner regions 90 at the lower end of the side are susceptible to external force and damage. On the other hand, by providing the front side protection portion 71 and the rear side protection portion 76, these corner regions 90 can be protected from an external force, and the possibility of damaging the battery 9 can be reduced. Further, the rear protection portion 76 satisfying 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.

Further, in the present embodiment, the battery protection portion 7 (front protection portion 71 and rear protection portion 76) is formed by a part of the housing 10. Therefore, the battery protection unit 7 can be easily formed without increasing the number of parts. Further, the battery protection portion 7 (front protection portion 71 and rear protection portion 76) has a lower surface of the battery 9 when the lower surface thereof is mounted on the battery mounting portion 6 (front mounting portion 61 and rear mounting portion 66). It is configured to be almost flush with each other. Therefore, the hammer drill 101 can be mounted on the ground or the floor in a stable posture with the lower surface of the battery protection unit 7 and the lower surface of the battery 9 as 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 the “motor”. The housing 10 is a configuration example corresponding to the “housing”. The battery mounting portion 6 is a configuration example corresponding to the “battery mounting portion”. The battery 9 and the corner area 90 are configuration examples corresponding to the “battery” and the “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 side protection unit 71 and the rear side protection unit 76 correspond to the "front side protection unit" and the "rear side protection unit", respectively. This is a configuration example.

<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 the present embodiment has substantially the same configuration as the hammer drill 101 of the first embodiment, except that the configurations of the lower portion 137 and the battery protection unit 70 are different from those of the first embodiment. Therefore, the same configuration will be omitted from the illustration and description, and different configurations will be mainly described with reference to the drawings. It should be noted that this point 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 the front side protection unit 72 and the 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 separate from the housing 10 including the lower portion 137, and is attached to the lower portion 137. The lower portion 137 projects downward on the front side and the rear side of the battery mounting portion 6. Then, the front side protection portion 72 and the rear side protection portion 77 are attached so as to cover these protruding portions. In the present embodiment, the front protective portion 72 and the rear protective portion 77 are made of a material different from that of the housing 10. More specifically, in the present embodiment, the housing 10 is made of a polyamide resin in consideration of weight reduction and rigidity, while the battery protection portion 70 is made of rubber in consideration of shock absorption. .. The battery protection unit 70 is attached to the housing 10 by being integrally molded with the housing 10.

The outer shape of the lower portion 137 and the battery protection portion 70 combined is substantially the same as the outer shape of the lower portion 136 including the battery protection portion 7 of the first embodiment. Therefore, as in the first embodiment, the front side protection portion 72 and the rear side protection portion 77 are configured so that their lower surfaces are substantially flush with the lower surface of the battery 9 mounted on the battery mounting portion 6. Further, the rear protection portion 77 is orthogonal to a virtual straight line connecting the center of gravity G (see FIG. 1) and the corner region 90 of the rear lower end portion of the rear battery 9, and the corner region 90 is formed. It is formed so as to project in a direction away from the center of gravity G rather than the virtual plane through which it passes.

According to the battery protection unit 70 of the present embodiment configured as described above, the front side protection unit 72 and the rear side protection unit 77 each have two corner regions 90 at the front lower end portion of the front battery 9 and the rear side protection unit 77. The two corner regions 90 at the rear lower end of the rear battery 9 can be protected from external forces to reduce the possibility of damage to the battery 9. Further, the corner region 90 is effectively protected from the impact when the hammer drill 102 is dropped while the center of gravity G is on any of the two corner regions 90 at the rear lower end of the rear battery 9. be able to.

Further, in the present embodiment, the battery protection unit 70 is integrally molded with the housing 10 as another member made of a material different from that of the housing 10. By forming the battery protection unit 70 as a separate member in this way, the battery protection unit 70 can be appropriately provided while keeping the housing 10 in a simple shape. Further, the housing 10 and the battery protection portion 70 can each be formed of an appropriate material. 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 made of a material having a smaller elastic modulus than the housing 10. Further, in this case, it is preferable that the material is not limited to rubber but is made of an elastic material.

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 "front side protection unit" and "front side protection unit", respectively. This is a configuration example corresponding to the "rear side protection unit".

<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 of the first embodiment (see FIG. 1) 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 so as to project downward from the battery mounting portion 6, and the rear portion of the lower surface thereof is formed. It is a stepped portion 731 that is slightly recessed upward with respect to the front side 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 substantially rectangular metal sheet metal so as to form a substantially L shape in a side view. The cover member 79 includes a lower surface portion 791 that extends in a direction substantially orthogonal to the rotation axis A2 of the motor 2, and a side surface portion 792 that bends and extends in a direction substantially orthogonal to the lower surface portion 791 from the rear end of the lower surface portion 791. Includes an upper surface portion 793 that bends and extends from the rear end of the side surface portion 792 in a direction substantially orthogonal to the side surface portion 792. The front end portion of the lower surface portion 791 is fixed to the step portion 731 of the front side protection portion 73 with a screw from the lower side. Further, the upper surface portion is fixed to the rear end portion of the lower portion 138 with screws from the lower side. As a result, a battery accommodating space having a rectangular shape in a side view and penetrating 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 side to the right side of the hammer drill 103, and is arranged in the battery accommodating space. At this time, the lower surface portion 791 is arranged so as to face the lower surface of the battery 9, and the side surface portion 792 is arranged so as to face the rear end surface of the battery 9 mounted on the rear mounting portion 66. Since the left side of the battery accommodating space is open, 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 arranged 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, a configuration corresponding to the combination of the front side protection part 71 of the first embodiment and the rear side protection part 77 of the second embodiment is adopted.

Specifically, the front side protection part 73 of the battery protection part 700 is formed as a part of the lower side part 138, while the rear side protection part 78 is formed of rubber as a separate member from the housing 10 and is on the lower side. Attached to portion 138. The front protection portion 73 is composed of a front end portion of the lower portion 138 formed so as to project downward from the battery mounting portion 6 as described 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 to the lower side of the rear end portion of the lower portion 138. The front side protection portion 73 and the rear side protection portion 78 are configured so that their lower surfaces are flush with the lower surface portion 791 of the cover member 79. In the left-right direction, as in the first and second embodiments, the left and right ends of the battery 9 project in the left-right direction from the battery protection portion 700 when the battery is mounted on the battery mounting portion 6 (see FIG. 2).

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

According to the battery protection unit 700 of the present embodiment configured as described above, the front side protection unit 73 and the rear side protection unit 78 have two corner regions 90 of the front lower end portion of the front battery 9, respectively. The two corner regions 90 at the rear lower end of the rear battery 9 can be protected from external forces to reduce the possibility of damage to the battery 9. Further, in particular, the impact when the hammer drill 103 falls with the center of gravity G resting on any of the two corner regions 90 of the rear lower end portion of the rear battery 9 due to the rubber rear protection portion 78. Therefore, the corner region 90 can be effectively protected.

Further, since the lower surface of the battery protection portion 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 portion 700 and the lower surface of the cover member 79 regardless of whether or not the battery 9 is attached. The hammer drill 103 can be mounted on the ground or the floor in a stable posture. Further, the cover member 79 can protect the battery 9 mainly by interfering with an external force toward the battery 9 from below the battery 9 (including in the oblique direction).

In the present 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 "front side protection unit" and "front side protection unit", respectively. This is a configuration example corresponding to the "rear side protection unit".

<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 of the first embodiment (see FIG. 1) 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 detachably configured, and an outer surface of the housing 10. It is provided with a battery protection unit 8 provided in the unit. The housing 10 includes a first housing portion 11 that houses the motor 2 and the drive mechanism 3, and a second housing portion 13 that is elastically connected to the first housing portion 11.

The lower portion 139 of the second housing portion 13 is arranged on the lower side of the motor 2, and has a battery mounting portion 60 at the lower end portion thereof. The battery mounting portion 60 of the present embodiment includes a front mounting portion 62 provided on the front side portion of the lower end portion of the lower portion 139, and a rear mounting portion 67 provided on the rear side 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, the hook engaging portion 601, the pair of guide rails 603, and the battery Includes connection terminal 605. On the other hand, unlike the first embodiment of the battery, the front mounting portion 62 is configured so 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 extend in the front-rear direction, respectively. Further, in the front mounting portion 62, the hook engaging portion 601 is arranged at the front end portion, and the battery connection terminal 605 is configured to connect to the terminal of the battery 9 from the rear. In the rear mounting portion 67, the hook engaging portion 601 is arranged at the rear end portion, and the battery connection terminal 605 is configured to connect to the terminal of the battery 9 from the front.

The battery protection portion 8 of the present embodiment includes a pair of front protection portions 81 provided at the front end portion of the lower portion 139 and a pair of rear protection portions 86 provided at the rear end portion. The pair of front protection portions 81 and the pair of rear protection portions 86 are each formed as a part of the lower portion 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 with the front portion region of the front side mounting portion 62, and project downward from the front side mounting portion 62. Is located in. Reinforcing ribs 801 are provided on the opposing surfaces of the pair of front protection portions 81 and the pair of rear protection portions 86. Further, the pair of rear side protection portions 86 are formed in a thin plate shape, are arranged so as to face each other in the left-right direction with the rear portion region of the rear side mounting portion 67 interposed therebetween and to project downward from the front side mounting portion 62. Has been done. When the battery 9 is mounted on the battery mounting portion 60, the pair of front protection portions 81 and the pair of rear protection portions 86 are left and right of the front end portion of the front battery 9 and the rear end portion of the rear battery 9, respectively. Placed 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 downward from the lower surface of the battery 9 when the battery 9 is mounted on the battery mounting portion 60, and each of them. The lower surface is formed so as to be substantially flush with each other.

Further, in the present embodiment, the pair of left and right front protection portions 81 have 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 the virtual straight line connecting each of the left and right corner regions 90 of the lower end portion (front lower end portion of the battery group 901), and protrudes in the direction away from the center of gravity G from the 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 (rear lower end portion of the battery group 901) of the rear battery 9, respectively. It is formed so as to be orthogonal to the virtual straight line and project in a direction away from the center of gravity G from the virtual plane passing through the corner region 90.

According to the battery protection unit 8 of the present embodiment configured as described above, the pair of front side protection units 81 are mainly left or right (including diagonal directions) to the front side of the pair of front side protection units 81. These corner regions 90 can be protected by interfering with external forces toward the two corner regions 90 at the lower end. Further, the pair of rear protection portions 86 mainly interfere with external forces from the left or right side (including the oblique direction) of the pair of rear protection portions 86 toward the two corner regions 90 at the rear lower end portion. By doing so, these corner regions 90 can be protected. That is, the possibility of damage to the battery 9 can be reduced. Further, from the impact when the hammer drill is dropped by the pair of front side protection portions 81 and the pair of rear side protection portions 86 with the center of gravity G resting on any of the four corner regions 90 at the lower end of the battery group 901. , The corner region 90 can be effectively protected.

Further, the hammer drill 104 is placed on the ground or floor in a stable posture with the lower surfaces of the pair of front protection portions 81 and the pair of rear protection portions 86 arranged at four locations surrounding the battery group 901 as mounting surfaces. 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 each "a pair of front side protection units 86". This is a configuration example corresponding to the "front protection unit" and the "pair of rear protection units".

<Fifth Embodiment>
Hereinafter, the hammer drill 105 according to the fifth embodiment will be described with reference to FIG. The hammer drill 105 of the present embodiment corresponds to a modified example in which the 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 the front side protection unit 71 and the rear side protection unit 76 as in the first embodiment. That is, the front protection portion 71 and the rear protection portion 76 are each formed as a part of the housing 10 (lower portion 136), and extend downward from the battery mounting portion 6 on the front side and the rear side of the battery mounting portion 6. Exists. With such a configuration, an internal space as an empty space is formed in the front side protection portion 71 and the rear side protection portion 76. Therefore, in the present embodiment, the wireless interlocking unit 711 is housed in the internal space of the front protection unit 71.

The wireless interlocking unit 711 is an additional mechanism that exerts a function different from the protection of the corner region 90 of the battery 9, and is configured to enable wireless communication with an external device. In the present embodiment, the wireless interlocking unit 711 uses radio waves in a predetermined frequency band via an antenna (not shown) to a stationary dust collector separate from the hammer drill 105 according to a control signal from the controller 5. It is configured to wirelessly transmit a predetermined interlocking signal. Since such a system itself is known, briefly, 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 made to transmit the 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 simply 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 an external force, the possibility of damage can be reduced, and the internal space of the battery protection unit 7 can be reduced. Can be effectively used to realize a function linked with a dust collector. In the present embodiment, the wireless interlocking unit 711 is a configuration example corresponding to the "additional mechanism" of the present invention. The wireless interlocking unit 711 may be housed in the internal space of the rear protection unit 76 instead of the front protection unit 71. Further, 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 another external device (for example, a mobile terminal).

<Sixth Embodiment>
Hereinafter, the hammer drill 106 according to the sixth embodiment will be described with reference to FIG. The hammer drill 106 of the present embodiment corresponds to a modified example 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 protection portion 71 and the rear protection portion 76 are formed as a part of the housing 10 (lower portion 136), respectively, and the front side and the rear side of the battery mounting portion 6 are formed. It extends below the battery mounting portion 6. Then, in the present embodiment, two USB terminals 712 are arranged in the internal space of the front side protection unit 71. The USB terminal 712 is an additional mechanism that exerts 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 mobile terminal). As a result, for example, the battery 9 mounted on the battery mounting unit 6 can be used to charge the USB device connected via the USB terminal 712.

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 an external force, the possibility of damage can be reduced, and the internal space of the battery protection unit 7 can be reduced. Can be effectively utilized to realize a power supply function from the battery 9 to the USB device. The USB terminal 712 may be housed in the internal space of the rear protection unit 76 instead of the front protection unit 71, and the number of the USB terminals 712 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 "additional mechanism" of the present invention.

<7th 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 modified example in which the 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 protection portion 71 and the rear protection portion 76 are formed as a part of the housing 10 (lower portion 136), respectively, and the front side and the rear side of the battery mounting portion 6 are formed. It extends below the battery mounting portion 6. Then, in the present embodiment, the distance sensor 713 is arranged in the internal space of the front side protection unit 71. The distance sensor 713 is an additional mechanism that exerts a function different from the protection of the corner region 90 of the battery 9, and is configured to be capable of measuring the distance to an object within a predetermined detection range. In this embodiment, an infrared distance sensor 713 is adopted, and the light of the infrared light emitting diode is projected from the through hole provided in the front wall portion of the front side protection portion 71, and the light reflected by the object is emitted. It is configured to measure the distance according to the position of incidence on the light receiving element.

When the hammer drill 107 drills the object to be machined 19 by drilling, the difference between the measured distance to the object to be machined 19 at the start of the work and the measured distance during the work is the depth of the formed hole. Generally corresponds to. Therefore, for example, when the calculated hole depth reaches a depth preset by the user, the controller 5 stops driving the motor 2 (see FIG. 1) or an LED lamp (not shown). ), Buzzer, etc. can be used for notification.

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 an external force, the possibility of damage can be reduced, and the internal space of the battery protection unit 7 can be reduced. Can be effectively utilized to realize a function of measuring the depth of a hole formed by a drilling operation. 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 "additional mechanism" of the present invention.

<8th Embodiment>
Hereinafter, the hammer drill 108 according to the eighth embodiment will be described with reference to FIG. The hammer drill 108 of the present embodiment corresponds to a modified example in which the battery protection portion 7 of the hammer drill 101 (see FIG. 1) of the first embodiment is reinforced by reinforcing members 803 and 805.

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

According to the hammer drill 108 of the present embodiment configured as described above, since the front side protection part 71 and the rear side protection part 76 are reinforced by the reinforcing members 803 and 805, respectively, the front side protection part 71 and the rear side protection part 71 When the 76 receives an external force, the possibility that the front side protection portion 71 and the rear side protection portion 76 are damaged can be reduced. This makes it possible to more reliably reduce the possibility of damage to the battery 9. 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.

It is sufficient that at least a part of the reinforcing members 803 and 805 is arranged in the front side protection portion 71 and the rear side protection portion 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 side protection portion 71 and the rear side protection portion 76. As shown in FIG. 11, at least one of the reinforcing members 803 and 805 is provided from the viewpoint of reducing the possibility that the front protective portion 71 and the rear protective portion 76 projecting downward from the battery mounting portion 6 are broken at the root. It is preferable that the portion extends above the battery mounting portion 6.

<9th 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 the present embodiment has substantially the same configuration as the hammer drill 101 of the first embodiment (see FIG. 1) except that the configuration of the battery protection unit 80 is different. In the above 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 portion 6, but the battery that can be attached to and detached from the battery mounting portion 6 has not only the battery 9 but also the capacity and size. There are several 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 side protection unit 83 and a rear side protection unit 88. The front protection portion 83 includes a base portion 831 and an additional portion 836 that is detachably formed on the base portion 831. Similarly, the rear protection portion 88 includes a base portion 881 and an additional portion 886 that is detachably configured on the base portion 881.

The base portions 831 and 881 correspond to the front side protection portion 71 and the rear side protection portion 76 of the first embodiment, respectively, and are formed as a part of the housing 10 (lower portion 136) of the battery mounting portion 6. 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 surface of the base portions 831 and 881 and the lower surface of the battery 9 are substantially flush with each other. Further, 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, respectively, with the upper surfaces thereof in contact with the lower surfaces of the base portions 831 and 881. Specifically, the additional portions 836 and 886 are formed with stepped holes 837 and 887 that penetrate in the vertical direction, respectively. Screws 839 and 889 are inserted into the stepped holes 837 and 887 from below and screwed into the screw holes 832 and 882 of the base portions 831 and 881, so that the additional portions 836 and 886 are fixed to the base portions 831 and 881. Will be 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 and the lower surface of the battery 903 are substantially flush with each other. It is configured. The battery 903 is a large-capacity battery having a height in the vertical direction larger than that of the battery 9. The width of the battery 903 in the front-rear direction and the length in the left-right direction are the same as those of the battery 9.

When the battery 9 is used as a power source, the user may use the hammer drill 109 with the additional parts 836 and 886 fixed to the base parts 831 and 881, or remove the screws 839 and 889 and use the additional parts. 836 and 886 may be used in a state of being removed from the base portions 831 and 881. In either case, the battery protector 80 can protect the corner region 90 of the battery 9 from external forces and reduce the possibility of damage to the battery 9. Further, by using the additional portions 836 and 886 removed from the base portions 831 and 881, the hammer drill 109 is stabilized on the ground or floor surface with the lower surface of the base portions 831 and 881 and the lower surface of the battery 9 as mounting surfaces. It can be placed in the correct posture.

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

The battery 9 and the battery 903 have the largest width in the front-rear direction (horizontal direction in FIG. 12) among the batteries that can be attached to and detached from the battery mounting portion 6. Therefore, in the battery protection unit 80, the distance between the front side protection unit 83 and the rear side protection unit 88 in the front-rear direction is set according to the batteries 9 and 903. The same applies to the battery protection units 7 (see FIG. 1), 70 (see FIG. 3), and 700 (see FIG. 5) of the above-described embodiment. As shown in FIG. 13, even when a small-capacity battery 904 having a width smaller in the front-rear direction than the batteries 9 and 903 is mounted on the battery mounting portion 6, the battery protection portion 80 covers the corner region 90 of the battery 903. It can protect against external forces and reduce the possibility of damage to the battery 904. Since the height of the battery 904 in the vertical direction and the length in the horizontal direction are the same as those of the battery 9, 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 use 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 vertical height of the battery can be adjusted appropriately. This makes it possible to protect the corner area 90 of the battery and reduce the possibility of damage regardless of which of the plurality of types of batteries having different sizes is installed. In the present 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", the "front side protection unit", and the "rear side protection unit" of the present invention, respectively. Is. The additional portions 836 and 886 may be attached to and detached 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 illustrated below can be made. In addition, only one or a plurality of these modifications may be adopted 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, 80 exemplified in the above embodiment may be adopted for a power tool other than the hammer drills 101 to 109. A power tool is a general tool that operates using electric power supplied from a battery and is used for work or the like. For example, any one of the battery protection units 7, 70, 700, 8, 80 may be adopted in a so-called rotary tool (for example, a shear wrench) configured to rotationally drive the final output shaft. In this case, the rotating shaft of the final output shaft corresponds to the working shaft A1.

In the configuration (shape, number, arrangement position, etc.) of the battery protection units 7, 70, 700, 8, 80, 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 appropriately changed as long as it can be protected from an external force. For example, in the first to third and fifth to ninth embodiments, the lower end positions of the battery protection units 7, 70, 700, and 80 are higher than the lower surfaces of the batteries 9, 903, and 904 mounted on the battery mounting unit 6. It may be placed below. The width of the battery protection units 7, 70, 700, 80 in the left-right direction may be equal to or greater than the width of the batteries 9, 903, 904 in the left-right direction. 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 by a rod-shaped member or a plate-shaped member for reinforcement below the lower surface of the battery 9.

Further, in the first to third and fifth to ninth embodiments, the front protection portions 71, 72, 73, and 83 are combined with the center of gravity G and the corner region 90 of the front lower end portion of the front batteries 9, 903, 904. It may be formed so as to be orthogonal to the virtual straight line connecting the above and project from the virtual plane passing through the corner region 90. In this case, even if the hammer drill falls while the center of gravity G is on the corner region 90 at the lower end of the front side, the front protection portions 71, 72, 73, and 83 cause the impact to cause the corner region 90 at the lower end of the front side. Can be effectively protected.

The tip tool 18 used has a relatively large diameter, and the hammer drills 101 to 109 (including the auxiliary handle) that employ a 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 power tool that exceeds. As described above, since the mounted battery 9 has a capacity of 18 volts, the battery 9 itself is also 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. With a large power tool with such a weight ratio, when the power tool is dropped, if the corner area collides with the floor or desk while the center of gravity is on the corner area of the battery, the battery will be damaged when dropped. Is more likely. Therefore, in the case of a power tool in which the total weight of the power tool including the battery exceeds 5 times the weight of the battery (particularly, the power tool having a total weight of 6 kg or more when the battery is attached), the battery protection unit is a battery. It is formed so as to be 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 to project in a direction away from the center of gravity from the virtual plane passing through the corner area. Is particularly preferable.

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

In the fourth embodiment, as in the second embodiment, all of the pair of front protection portions 81 and rear protection portions 86 are formed of a member separate from the housing 10 (lower portion 139) and attached to the housing 10. You may. Alternatively, as in the third embodiment, a part of the pair of front protection portions 81 and the rear protection portion 86 is formed as a part of the housing 10 (lower portion 139), and the remaining part is formed of the housing 10 (the housing 10 (lower portion 139)). It may be formed of a member separate from the lower portion 139) 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, 60 is not limited to two, and may be one or three or more. When a battery mounting portion having one removable battery 9, 903, 904 is adopted, the battery protection portion is an end portion (upper end portion) on the side mounted on the battery mounting portion of the batteries 9, 903, 904. It suffices to be configured to protect at least one of the corner regions 90 at the opposite end (lower end) from external forces, but it is more preferred to be configured to protect all from external forces. .. Further, in particular, the protective portion corresponding to the corner region 90, which is likely to be impacted with the center of gravity on it when dropped, is preferably 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 in a predetermined direction (for example, the extending direction (front-back direction) of the work axis A1 and the direction orthogonal to the work axis A1 and the rotation axis A2 (left-right direction). )), A plurality of batteries 9, 903, and 904 may be regarded as one battery group when they can be attached and detached in a lined state. In this case, the 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 the entire corner region 90 at the lower end of the battery group as a whole from external forces. In other words, the battery protection unit is a battery 9 arranged at the end on the first direction side in a predetermined direction (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 on the first direction side of the battery 9, and the battery 9 arranged at the end of the plurality of batteries 9, 903, 904 on the second direction side opposite to the first direction in a predetermined direction. It is preferable that the corner region 90 at the lower end of the 903 and 904 on the second direction side is configured to be protected from an 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 of being arranged in the front-rear direction, in the battery group, the front lower end portion of the batteries 9, 903, 904 arranged at the frontmost portion. 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 located at the rearmost position. In this case, the battery protection unit may include two portions, each of which protects two corner regions 90, as in the first to third and fifth to ninth embodiments, or the fourth embodiment. As such, each may include four portions that protect one corner region 90. The battery protector may also be configured to protect the four corner areas with one or three portions. 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.

Further, in the above embodiment, the housing 10 including the first housing portion 11 and the second housing portion 13 elastically connected so as to be relatively movable is illustrated, but the housing 10 is not necessarily configured as such a so-called anti-vibration housing. It doesn't have to be. Even when the anti-vibration housing structure is adopted, the configuration can be changed as appropriate. For example, the lower portions 136, 137, 138, and 139 are integrally formed with the motor accommodating 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. It may be elastically connected to the first housing portion 11 so as to be relatively movable. In this case, the battery protection portions 7, 70, 700, 8, 80 may be provided in the first housing portion 11 instead of the second housing portion 13. In the vibration-proof housing, the battery mounting portion and the battery protection portion are attached to the second housing elastically connected to the first housing in which the vibration source (motor 2 and drive mechanism 3) is housed as in the above embodiment. When provided, it is preferable in that the effect of preventing chattering and improving the anti-vibration effect can be obtained.

Further, in view of the gist of the present invention and the above-described embodiment, the following aspects are constructed. The following aspects may be employed in combination with the hammer drills 101-109 shown in the embodiments, the above modifications, or the inventions 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 below the motor.
The battery mounting portion is configured such that the upper end portion of the battery group including the at least one battery is mounted on the battery mounting portion and the 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 portion of the battery group from external forces.
<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 below the motor.
The battery mounting portion is configured such that the upper end portions of a plurality of batteries arranged in a predetermined direction are mounted on the battery mounting portion and the lower end portions of the plurality of batteries are exposed from the housing.
Among the plurality of batteries, the battery protection unit includes a corner region of the lower end portion of the battery arranged at the end on the first direction side in the predetermined direction, and the plurality of batteries. , 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 an external force. ..
<Aspect 3>
In aspect 2,
The predetermined direction is the front-back direction,
The battery protection unit includes a corner region of the front lower end portion of the battery arranged at the front of the plurality of batteries, and a rear lower end portion of the battery arranged at the rear end of the plurality of batteries. The corner area of the battery may be configured to protect it from external forces.
<Aspect 4>
The power tool is a power tool in which the total weight including the battery when the battery is mounted in the battery mounting portion exceeds 5 times the weight of the battery.
The battery protection portion is orthogonal to a virtual straight line connecting the center of gravity of the power tool and the corner region when the battery is mounted on the battery mounting portion, and is more than a virtual plane passing through the corner region. , It may be formed so as to project in a direction away from the center of gravity.
<Aspect 5>
In aspect 4,
The power tool is a striking tool that is configured so that the tip tool can be attached and detached and that the tip tool is linearly driven along the work axis via a striking element, and is formed on the housing. A crank mechanism that is accommodated and configured to convert the rotational power of the motor into linear motion and transmit it to the striker may be provided.
<Aspect 6>
The battery protection unit includes a rear side protection unit arranged on the rear side with respect to the battery mounting unit in the front-rear direction.
The rear protection portion is orthogonal to a virtual straight line connecting the center of gravity of the power tool and the corner region when the battery is mounted on the battery mounting portion, and is from a virtual plane passing through the corner region. Also, it may be formed so as to project 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: Crankshaft 32: Connecting rod 33: Piston 34: Tool holder 35: Cylinder 36: Strike element 361: Striker 363: Impact bolt 365: Air chamber 38: Rotation transmission mechanism 4: Mode switching dial 41: 1st spring 42: 2nd spring 46: Upper sliding part 47: Lower sliding part 5: Controller 6, 60: Battery mounting part 61, 62: Front mounting part 66, 67: Rear mounting part 601: Hook engaging part 603: Guide rail 605: Battery connection terminal 7, 70, 700 , 8, 80: Battery protection parts 71, 72, 73, 81, 83: Front protection parts 76, 77, 78, 86, 88: Rear protection parts 831, 881: Base parts 832, 882: Screw holes 836, 886 : Addition part 837, 887: Stepped hole 839, 889: Screw 711: Wireless interlocking unit 712: USB terminal 713: Distance sensor 731: Step part 801: Reinforcing rib 803, 805: Reinforcing member 79: Cover member 791: Bottom part 792: Side surface part 793: Top surface part 9, 903, 904: Battery 90: Corner area 91: Hook 93: Guide groove 95: Button 900, 901: Battery group 10: Housing 11: First housing part 111: Motor housing part 117: Drive mechanism accommodating part 13: Second housing part 131: Gripping part 133: Upper part 134: Barrel part 136, 137, 138, 139: Lower part 14: Trigger 145: Switch 18: Tip tool A1: Working shaft A2 : Rotation axis G: Center of gravity

Claims (14)

It ’s a power tool,
A motor having a motor shaft that can rotate around a rotating shaft extending in a direction intersecting a working shaft extending in the front-rear direction of the power tool, and a motor.
The housing that houses the motor and
A battery mounting portion in which at least one battery is detachably attached, which is provided in the housing and is arranged on the side opposite to the working shaft with the motor in the extending direction of the rotating shaft. With the mounting part
A battery protection unit provided on the outer surface of the housing is provided.
The battery mounting portion is such that one end of the 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 rotating shaft. It is composed and
The battery protection unit, wherein, when said one end to the battery mounting portion is mounted, is configured to protect said at least one corner region of the opposite end of the at least one battery from the external forces ,
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 larger than the bearing supporting the lower end portion of the motor shaft. It is arranged on the lower side and at a position overlapping the lower region of the motor in a side view.
The battery protection portion is formed by a part of the housing.
The power tool is characterized in that the battery protection portion includes a front protection portion and a rear protection portion arranged on both sides of the battery mounting portion in the front-rear direction . The power tool according to claim 1.
The housing includes a drive mechanism accommodating portion extending in the front-rear direction along the work axis, a motor accommodating portion projecting downward from the rear end portion of the drive mechanism accommodating portion, and a rear portion of the motor accommodating portion. Includes a grip that extends in the vertical direction
An electric tool characterized in that the front end of the front protection portion and the rear end of the rear protection portion are substantially at the same positions as the front end of the motor accommodating portion and the rear end of the grip portion, respectively, in the front-rear direction. .. The power tool according to claim 1 or 2 .
The part of the housing forming the battery protection portion is made of resin and is made of resin.
A power tool further provided with a metal reinforcing member in which at least a part thereof is arranged in the battery protection portion. It ’s a power tool,
A motor having a rotating shaft extending in a direction intersecting with a working shaft extending in the front-rear direction of the power tool,
The housing that houses the motor and
A battery mounting portion configured to allow at least one battery to be attached and detached, which is provided in the housing and is arranged on the side opposite to the working shaft with the motor in the extending direction of the rotating shaft. With the mounting part
A battery protection unit provided on the outer surface of the housing is provided.
The battery mounting portion is such that one end of the 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 rotating shaft. It is composed and
The battery protection portion is configured to protect at least one corner region of the opposite end portion of the at least one battery from external force when the one end portion is mounted on the battery mounting portion. ,
The battery protection portion is orthogonal to a virtual straight line connecting the center of gravity of the power tool and the corner region when the battery is mounted on the battery mounting portion, and is more than a virtual plane passing through the corner region. , An electric tool characterized in that it is formed so as to project in a direction away from the center of gravity. It ’s a power tool,
A motor having a rotating shaft extending in a direction intersecting with a working shaft extending in the front-rear direction of the power tool,
The housing that houses the motor and
A battery mounting portion configured to allow at least one battery to be attached and detached, which is provided in the housing and is arranged on the side opposite to the working shaft with the motor in the extending direction of the rotating shaft. With the mounting part
A battery protection unit provided on the outer surface of the housing is provided.
The battery mounting portion is such that one end of the 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 rotating shaft. It is composed and
The battery protection portion is configured to protect at least one corner region of the opposite end portion of the at least one battery from external force when the one end portion is mounted on the battery mounting portion. ,
A power tool further provided with an additional mechanism arranged in the internal space of the battery protection unit and configured to perform a function different from the protection of the corner area. It ’s a power tool,
A motor having a rotating shaft extending in a direction intersecting with a working shaft extending in the front-rear direction of the power tool,
The housing that houses the motor and
A battery mounting portion configured to allow at least one battery to be attached and detached, which is provided in the housing and is arranged on the side opposite to the working shaft with the motor in the extending direction of the rotating shaft. With the mounting part
A battery protection unit provided on the outer surface of the housing is provided.
The battery mounting portion is such that one end of the 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 rotating shaft. It is composed and
The battery protection portion is configured to protect at least one corner region of the opposite end portion of the at least one battery from external force when the one end portion is mounted on the battery mounting portion. ,
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 a power tool characterized in that the length of the rotating shaft in the extending direction can be adjusted. The power tool according to any one of claims 4 to 6 .
The power tool, wherein the battery protection portion is formed by a part of the housing. The power tool according to claim 7 .
The part of the housing forming the battery protection portion is made of resin and is made of resin.
A power tool further provided with a metal reinforcing member in which at least a part thereof is arranged in the battery protection portion. The power tool according to any one of claims 4 to 6 .
The power tool, characterized in that the battery protection portion is formed as a member separate from the housing and is attached to the housing. The power tool according to claim 9 .
The power tool, wherein the battery protection unit is made of a material different from that of the housing. The power tool according to any one of claims 4 to 10 .
The power tool is characterized in that the battery protection portion includes a front protection portion and a rear protection portion arranged on both sides of the battery mounting portion in the front-rear direction. The power tool according to any one of claims 4 to 10 .
The battery protection portions are provided on both sides of a pair of front protection portions arranged on both sides of the front region of the battery mounting portion and on both sides of the rear region of the battery mounting portion in a direction intersecting the work axis and the rotation axis. A power tool comprising a pair of arranged rear protections. The power tool according to any one of claims 1 to 12 .
The battery mounting portion is a power tool characterized in that a plurality of batteries are detachably attached in a state of being arranged in the front-rear direction. The power tool according to any one of claims 1 to 13 .
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 below the motor.
The power tool is characterized in that the lower surface of the battery protection unit is configured to be substantially flush with the lower surface of the battery when it is mounted on the battery mounting portion.

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