Working machine

Abstract

To improve convenience of a working machine.SOLUTION: The housing 20 includes the first wall portion 27 having the first wall surface 27a, the second wall portion 28 having the second wall surface 27a facing the first wall surface 28a in the left-right direction, and the single battery accommodation chamber BR provided between the first wall portion 27 and the second wall portion 28 and capable of accommodating the battery pack 30, and the first wall surface 27a is provided with the first connecting terminal-portion 27b to which the battery pack 30 is electrically connectable. The second wall surface 28a is provided with second connection terminals 28b to which the battery pack 30 can be electrically connected.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a work machine operated by a motor. [Background technology]

[0002] Patent Document 1 describes a work machine equipped with a motor that generates a driving force to drive a tool. The work machine described in Patent Document 1 has a battery mounting section at the lower end of the handle to which a pair of battery packs can be attached, with the battery packs mounted on both the left and right sides of the battery mounting section. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2023 / 281866 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned Patent Document 1, the outer left and right sides of the pair of battery packs are exposed to the outside. As a result, for example, when the work machine is toppled, a large impact is directly transmitted to the battery packs, which may damage the battery packs. Therefore, the battery packs must be handled carefully to avoid damage, which reduces convenience.

[0005] Therefore, it is possible to consider providing protective covers on the left and right outer sides of each battery pack, but in this case, in addition to having a battery mounting section between the pair of battery packs, providing a pair of protective covers would increase the left and right dimensions of the work machine, which would also reduce convenience.

[0006] An object of the present invention is to improve the convenience of a work machine. [Means for solving the problem]

[0007] In one aspect of the present invention, a tool holder includes a tool holder that holds a tool bit, a motor that generates a driving force to drive the tool bit, and a housing that supports the tool holder and the motor. The housing includes a first wall portion having a first wall surface, a second wall portion having a second wall surface that faces the first wall surface in a first direction, and a single battery storage chamber that is provided between the first wall portion and the second wall portion and is capable of storing a battery pack. The first wall portion is provided with a first connection terminal portion to which the battery pack can be electrically connected, and the second wall portion is provided with a second connection terminal portion to which the battery pack can be electrically connected.

[0008] In another aspect of the present invention, a motor is provided, and a housing supporting the motor is provided. The housing has a first wall portion having a first wall surface, a second wall portion having a second wall surface facing the first wall surface in a first direction, a third wall portion having a third wall surface facing one side of a second direction that intersects with the first direction, and a fourth wall portion having a fourth wall surface facing one side of a third direction that intersects with both the first direction and the second direction. The first wall portion, the second wall portion, the third wall portion, and the fourth wall portion each cooperate to define a single battery storage chamber capable of accommodating a battery pack. A first connection terminal portion to which the battery pack can be electrically connected is provided on the first wall surface, and a second connection terminal portion to which the battery pack can be electrically connected is provided on the second wall surface. The single battery storage chamber is open on one side in the second direction and closed on the other side by the third wall portion, and open on one side in the third direction and closed on the other side by the fourth wall portion. [Effects of the Invention]

[0009] According to the present invention, the convenience of the work machine can be improved. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a view of the electric hammer of the first embodiment as seen from the left side. [Figure 2]2 is a partially enlarged view of the electric hammer of FIG. 1 as seen from below. [Figure 3] FIG. 2 is a partially enlarged view of the electric hammer of FIG. 1 as seen from the rear side. [Figure 4] FIG. 2 is a perspective view showing the battery pack alone. [Figure 5] FIG. 2 is a partially enlarged view corresponding to FIG. 1 with the battery pack removed. [Figure 6] FIG. 3 is a view corresponding to FIG. 2 with the battery pack removed. [Figure 7] FIG. 2 is a perspective view showing the inside of a single battery compartment. [Figure 8] FIG. 10 is a perspective view showing a first modified example in which another battery pack is attached. [Figure 9] FIG. 10 is a view of the electric hammer of the second embodiment as seen from the left side. [Figure 10] 10 is a view of the electric hammer of FIG. 9 corresponding to FIG. 3. [Figure 11] 9A and 9B are views of the electric hammer corresponding to FIG. 5. [Figure 12] 10 is a view of the electric hammer of FIG. 9 corresponding to FIG. 6. [Figure 13] 10 is a view of the electric hammer of FIG. 9 corresponding to FIG. 7. [Figure 14] FIG. 10 is a partially enlarged view showing a second modified example in which one battery pack is attached. [Figure 15] FIG. 15 is a partially enlarged view of the electric hammer of FIG. 14 as viewed from below. [Figure 16] FIG. 15 is a partially enlarged view of the electric hammer of FIG. 14 as seen from the rear side. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0012] <First Embodiment> Fig. 1 is a view of the electric hammer of embodiment 1 as seen from the left side. Fig. 2 is a partially enlarged view of the electric hammer of Fig. 1 as seen from below. Fig. 3 is a partially enlarged view of the electric hammer of Fig. 1 as seen from the rear. Fig. 4 is a perspective view showing the battery pack alone. Fig. 5 is a partially enlarged view corresponding to Fig. 1 with the battery pack removed. Fig. 6 is a view corresponding to Fig. 2 with the battery pack removed. Fig. 7 is a perspective view showing the inside of a single battery housing chamber.

[0013] <Outline of the electric hammer> As shown in FIG. 1 , a tool tip 11 (see imaginary lines) is detachably attached to an electric hammer 10. When a switch SW is operated to operate the electric hammer 10, the tool tip 11 repeatedly strikes at a predetermined frequency. For example, the tool tip 11 may have a so-called "bull point" formed in a tapered rod shape. This allows the electric hammer 10 to be used to perform drilling, chipping, and breaking operations on objects such as concrete and stone. The electric hammer 10 corresponds to the working machine of the present invention.

[0014] The electric hammer 10 has a housing 20 that forms its outer shell. Specifically, the housing 20 supports the electric motor 12, a motion conversion mechanism 13, and a striking unit 14. The motion conversion mechanism 13 has the function of converting the rotational motion of the rotating shaft that forms the electric motor 12 into the reciprocating motion of a striking member that forms the striking unit 14.

[0015] As a result, the driving force of the electric motor 12 is transmitted to the tool bit 11 via the impact unit 14. In this way, the electric motor 12 generates the driving force for driving the tool bit 11, and corresponds to the motor in the present invention.

[0016] Here, as shown in FIG. 1, the axial direction of the electric motor 12 is defined as the up-down direction. This up-down direction corresponds to the second direction in the present invention. Furthermore, the axial direction of the tool bit 11 (the direction in which the axis C extends) is defined as the front-rear direction. This front-rear direction corresponds to the third direction in the present invention. Furthermore, the direction perpendicular to both the axial direction of the electric motor 12 (up-down direction) and the axial direction of the tool bit 11 (front-rear direction) is defined as the left-right direction (see FIG. 2). This left-right direction corresponds to the first direction in the present invention.

[0017] <Housing> 1 and 2, the housing 20 includes a box-shaped housing portion 21 that supports the electric motor 12 and the motion conversion mechanism 13 therein. The housing 20 also includes a cylindrical housing portion 22 that supports the striking unit 14 therein. Specifically, the box-shaped housing portion 21 is disposed on the rear side of the electric hammer 10, and the cylindrical housing portion 22 is disposed on the front side of the electric hammer 10.

[0018] A tool holder 23 for holding the tool bit 11 is fixed to the front side of the cylindrical housing portion 22. In this manner, the housing 20 supports the tool holder 23 and the electric motor 12.

[0019] <Box-shaped housing part> 1 to 3 and 5 to 7, the box-shaped housing portion 21 includes a first housing half 21a disposed on the left side of the electric hammer 10 and a second housing half 21b disposed on the right side of the electric hammer 10. The first and second housing half 21a, 21b disposed on the left and right, respectively, are butted against each other with the axis C of the bit 11 (see FIG. 1) at the center.

[0020] The box-shaped housing portion 21 also includes a connecting housing body 21c. This connecting housing body 21c has the function of holding the first and second housing halves 21a, 21b in a butted state. Specifically, the connecting housing body 21c is attached from below the first and second housing halves 21a, 21b after the first and second housing halves 21a, 21b are butted against each other.

[0021] The box-shaped housing 21 includes a main body 24, a handle 25 that is held by the operator, and a battery pack attachment section 26. The main body 24 extends in the direction of the axis C, i.e., in the front-to-rear direction of the electric hammer 10, and the electric motor 12 and the motion conversion mechanism 13 are housed inside the main body 24.

[0022] The main body 24 and the handle 25 are arranged side by side in the front-to-rear direction of the electric hammer 10, and the handle 25 extends in a direction perpendicular to the direction in which the axis C extends. As a result, for example, when an operator stands on the ground and holds the handle 25 in his / her hand, the tip side of the bit 11 faces the ground.

[0023] The axis C passes through the handle 25 at approximately the center in the vertical and horizontal directions. This allows the operator holding the electric hammer 10 to hold the electric hammer 10 in a balanced manner without putting a large load on the wrist. A switch SW that can be pressed with the operator's index finger or the like is provided on the side (front side) of the handle 25 where the main body 24 is provided.

[0024] Electrical wiring (not shown) that electrically connects the electric motor 12, the pair of battery packs 30, and the switch SW is housed inside the handle portion 25. Thus, by pressing the switch SW, the electric motor 12 is driven, and the driving force of the electric motor 12 is transmitted to the tool bit 11 via the impact unit 14.

[0025] A first bridging portion 25a is integrally provided on the upper side of the handle portion 25 and extends in the front-to-rear direction. This first bridging portion 25a connects the main body portion 24 and the upper side of the handle portion 25. Furthermore, a second bridging portion 25b is integrally provided on the lower side of the handle portion 25 and extends in the front-to-rear direction. This second bridging portion 25b connects the main body portion 24 and the lower side of the handle portion 25.

[0026] As a result, a space SP in which the operator's fingers can be placed is formed inside the area surrounded by the main body 24, the first bridging portion 25a, the handle 25, and the second bridging portion 25b.

[0027] <Battery pack attachment area> 1 to 3, a pair of battery packs 30 are attached to the battery pack attachment section 26 that forms the housing 20. That is, the battery pack attachment section 26 is capable of holding the pair of battery packs 30. Here, the pair of battery packs 30 are of the same specifications, and for example, both use storage batteries with a voltage of 36V.

[0028] The pair of battery packs 30 attached to the battery pack attachment section 26 can only be used with the same voltage combination, such as 36 V or 18 V. Furthermore, the pair of battery packs 30 are connected in parallel to each other in terms of electrical circuitry when attached to the battery pack attachment section 26. This allows the electric hammer 10 to be operated for a long period of time.

[0029] Furthermore, the electric hammer 10 cannot be operated with only one battery pack 30. The combination and connection state of the battery packs 30 attached to the battery pack attachment parts 26 are determined by a controller (not shown) installed inside the box-shaped housing part 21.

[0030] 4, the battery pack 30 has a front surface 31 and a back surface 32, and a terminal portion 33 is integrally formed on the front surface 31. The terminal portion 33 is electrically connectable to first and second connection terminal portions 27b, 28b (see FIG. 7) provided on first and second wall surfaces 27a, 28a (see FIG. 7) that form the battery pack mounting portion 26.

[0031] Specifically, a pair of slide rails 34 are provided on the terminal portion 33 so as to sandwich the terminal portion 33. Then, by attaching these slide rails 34 along rail portions 27c, 28c (see FIG. 7) provided on the first and second wall portions 27, 28 (see FIG. 7), respectively, the terminal portion 33 is electrically connected to the first and second connection terminal portions 27b, 28b, respectively.

[0032] Unlock buttons 35 (only one of which is shown in FIG. 4) are provided near each of the pair of slide rails 34 provided on the battery pack 30. By grasping and pressing these unlock buttons 35, the battery packs 30 fixed (locked) to the first and second wall portions 27, 28 can be removed.

[0033] 6 and 7, the battery pack mounting section 26 includes a first wall portion 27 disposed on the left side of the electric hammer 10 and a second wall portion 28 disposed on the right side of the electric hammer 10. The battery pack mounting section 26 also includes a second bridging portion 25b disposed above the first and second wall portions 27, 28. The battery pack mounting section 26 also includes a housing wall portion 29 disposed in front of the first and second wall portions 27, 28.

[0034] As such, the battery pack mounting section 26 consists of the first wall section 27, the second wall section 28, the second bridging section 25b and the housing wall section 29, and inside the battery pack mounting section 26, a single battery storage chamber BR capable of storing a pair of battery packs 30 (see Figure 4) is formed.

[0035] Here, "single" means that there is nothing separating the first wall portion 27 and the second wall portion 28, which are arranged opposite each other. In other words, as shown in Figures 6 and 7, inside the battery pack mounting portion 26, there is only one space that is surrounded by the first wall portion 27, the second wall portion 28, the second bridging portion 25b, and the housing wall portion 29 and that can accommodate a pair of battery packs 30.

[0036] As an example, "single" means, more specifically, that the handle portion 25 (third wall surface 25c) is positioned above the first wall portion 27 and the second wall portion 28 so that the housing 20 is not interposed between the first wall portion 27 and the second wall portion 28.

[0037] As another example, "single" means, more specifically, that the handle portion 25 (third wall surface 25c) is positioned above the first connection terminal portion 27b and the second connection terminal portion 28b, so that the housing 20 is not interposed between the first connection terminal portion 27b and the second connection terminal portion 28b, which will be described later.

[0038] As yet another example, "single" means, more specifically, that the housing 20 is not interposed between the battery pack 30 attached to the first connection terminal portion 27b and the battery pack 30 attached to the second connection terminal portion 28b, and the handle portion 25 (third wall surface 25c) is positioned above the respective battery packs 30 attached to the first connection terminal portion 27b and the second connection terminal portion 28b so that the back surfaces 32 of the respective battery packs 30 directly face each other.

[0039] <First wall portion and second wall portion> The first wall portion 27 has a first wall surface 27a facing the right side (one side in the first direction) of the electric hammer 10. The second wall portion 28 has a second wall surface 28a facing the left side (the other side in the first direction) of the electric hammer 10 and facing the first wall surface 27a. In this way, the first wall portion 27 and the second wall portion 28 are disposed opposite each other in the left-right direction of the electric hammer 10, and the first wall surface 27a and the second wall surface 28a are provided parallel to each other.

[0040] A single battery storage chamber BR is provided between a first wall 27 and a second wall 28 that are aligned in the left-right direction of the electric hammer 10. The first wall 27a is provided with a first connection terminal 27b to which the battery pack 30 can be electrically connected. The second wall 28a is provided with a second connection terminal 28b that is formed in the same manner as the first connection terminal 27b.

[0041] As a result, in a single battery storage chamber BR, as shown in Figures 2 and 3, a pair of battery packs 30 can be stored in parallel with their respective back surfaces 32 facing each other with a small gap between them, thereby making it possible to store the pair of battery packs 30 without creating dead space, and to electrically connect the pair of battery packs 30 to the first and second connection terminal portions 27b, 28b.

[0042] 2 and 3, the outline of the battery pack 30 is shown by a thick dashed line to make the arrangement of the battery pack 30 easier to understand.

[0043] Therefore, in the left-right direction of the electric hammer 10, the maximum width dimension W (see FIG. 6) of a single battery housing chamber BR is kept to the minimum necessary width dimension, preventing the electric hammer 10 from becoming larger in the left-right direction. Also, since the battery packs 30, which are relatively heavy, are arranged close to each other butt-together, there is no need to distribute the heavy objects. This optimizes the weight distribution of the electric hammer 10, meaning that the battery packs 30, which are heavy objects, can be arranged in one place in the single battery housing chamber BR, thereby improving the operability of the electric hammer 10.

[0044] Furthermore, a pair of rail portions 27c, 28c are provided on each of the first and second connection terminal portions 27b, 28b, sandwiching the first and second connection terminal portions 27b, 28b. These rail portions 27c, 28c extend in the front-rear direction of the electric hammer 10. A pair of slide rails 34 (see FIG. 4) provided on the battery pack 30 are slidably guided along the pair of rail portions 27c provided on the first connection terminal portion 27b and the pair of rail portions 28c provided on the second connection terminal portion 28b.

[0045] As a result, the battery pack 30 is slidably mounted on the rails 27c and 28c, and the terminals 33 (see FIG. 4) of the battery pack 30 are easily and reliably electrically connected to the first and second connecting terminals 27b and 28b, respectively, thereby improving the operability of the electric hammer 10.

[0046] <Second Bridging Section> 5 to 7, the second bridging portion 25b forming the battery pack mounting portion 26 is formed in a substantially flat plate shape and includes a third wall surface 25c facing downward in the up-down direction (one side of the second direction) intersecting with the left-right direction of the electric hammer 10. The second bridging portion 25b, together with the first wall portion 27 and the second wall portion 28, defines a single battery storage chamber BR. The second bridging portion 25b corresponds to the third wall portion in the present invention.

[0047] As a result, the single battery storage chamber BR defined by the second bridging portion 25b and the first and second wall portions 27, 28 is open on the lower side in the vertical direction of the electric hammer 10, and is closed on the upper side (the other side in the second direction) by the second bridging portion 25b.

[0048] Therefore, the battery pack mounting section 26 does not need to be made larger, and since the pair of battery packs 30 are surrounded from three directions (left and right sides and above), the pair of battery packs 30 can be adequately protected from external impacts.

[0049] Also, as shown in Figures 1, 3, 5 and 7, in the vertical direction of the electric hammer 10, the handle portion 25 is provided on the opposite side of the second bridging portion 25b from the side on which the single battery storage chamber BR is provided, and the handle portion 25 extends in the vertical direction of the electric hammer 10.

[0050] This allows the pair of battery packs 30, which are heavy objects, to be placed near the handle portion 25 that is held by the operator. This also optimizes the weight distribution of the electric hammer 10. Specifically, the operator holds the electric hammer 10 near the center of gravity (near the electric motor 12 and battery packs 30, which are heavy objects). This improves the operability of the electric hammer 10 and ultimately minimizes the burden on the operator.

[0051] 1, the tool bit 11 attached to the tool holder 23 extends in a rod-like shape in the front-rear direction intersecting both the left-right direction and the up-down direction of the electric hammer 10, and the handle 25 is provided so as to intersect with the axis C of the tool bit 11. As shown in FIGS. 3 and 7, the single battery housing chamber BR is disposed offset from the axis C to the lower side in the up-down direction of the electric hammer 10 (to one side in the second direction).

[0052] Therefore, vibrations of the tool bit 11 are transmitted straight to the handle portion 25 on the axis C. Specifically, vibrations of the tool bit 11 transmitted along the axis C do not act in a direction that rotates the handle portion 25. Therefore, for example, the operator does not need to tightly grip the handle portion 25, which in turn reduces the burden on the operator. This improves the operability of the electric hammer 10.

[0053] 6, when viewed from below or above the electric hammer 10 in the up-down direction, the housing 20 has slits SL that connect a single battery storage chamber BR to the outside between the first wall portion 27 and the second bridging portion 25b along the left-right direction of the electric hammer 10 and between the second wall portion 28 and the second bridging portion 25b along the left-right direction of the electric hammer 10. Specifically, when the position where the rear end portions T1 of the first and second wall portions 27, 28 are disposed is defined as a reference position BL, each slit SL is provided so as to be recessed forward from the reference position BL.

[0054] 2 and 3, when a pair of battery packs 30 are accommodated and locked in a single battery housing chamber BR, the unlocking buttons 35 provided on the battery packs 30 are exposed through the slits SL. That is, by providing the pair of slits SL, the unlocking buttons 35 provided on the battery packs 30 can be operated. Incidentally, by providing the pair of slits SL, the weight of the housing 20 can be reduced.

[0055] In this way, the battery pack attachment section 26 protects the pair of battery packs 30 from external impacts while still allowing the operation of the unlock buttons 35. Here, as shown in FIG. 2, the bottom side of the single battery housing chamber BR is open. Therefore, all of the unlock buttons 35 of the pair of battery packs 30 (a total of four) are exposed to the outside. This allows each battery pack 30 to be easily attached to and detached from the battery pack attachment section 26.

[0056] 5, the rear end T2 of the second bridging portion 25b in the front-to-rear direction is disposed rearward (to the right in FIG. 5) from the rear end T1 of the first and second wall portions 27, 28. Specifically, the end T1 of the second bridging portion 25b is disposed shifted rearward from the end T2 of the second wall portions 27, 28 by a distance L that is approximately equal to the thickness (diameter dimension) of the handle portion 25.

[0057] This prevents the pair of battery packs 30 from protruding rearward from the handle portion 25 in the front-to-rear direction of the electric hammer 10. This also makes it possible to more sufficiently protect the pair of battery packs 30. Furthermore, because the pair of battery packs 30 do not protrude rearward from the handle portion 25 in the front-to-rear direction of the electric hammer 10, the external appearance of the electric hammer 10 can be made neater and the appearance can be improved.

[0058] <Housing wall> 6 and 7, the housing wall 29 has a fourth wall surface 29a facing rearward in the front-rear direction of the electric hammer 10 (one side in the third direction). The housing wall 29, together with the first wall 27, the second wall 28, and the second bridging portion 25b, defines a single battery accommodating chamber BR. The housing wall 29 corresponds to the fourth wall in the present invention.

[0059] As a result, the housing wall 29, the first wall 27, the second wall 28, and the second bridging portion 25b cooperate to define a single battery storage chamber BR. The rear side in the front-to-rear direction of the electric hammer 10 is open, and the front side (the other side in the third direction) is closed by the housing wall 29.

[0060] In this way, by surrounding the pair of battery packs 30 from four directions (front, left, right and top), the pair of battery packs 30 can be more sufficiently protected against external impacts.

[0061] Furthermore, by enclosing the pair of battery packs 30 from four directions while leaving the lower and rear sides of the single battery storage chamber BR open, the housing 20 is made lighter and the pair of battery packs 30 can be easily attached and detached, thereby also increasing the convenience of the electric hammer 10.

[0062] <Variation 1> Battery packs of other shapes can also be attached to the electric hammer 10 configured as described above. A first modified example of the electric hammer 10 will now be described with reference to the drawings.

[0063] FIG. 8 is a perspective view showing a first modified example in which another battery pack is attached.

[0064] As shown in Fig. 8, the electric hammer 10 of the first modification is equipped with a smaller battery pack 40 that has a lower voltage than the battery pack 30 shown in Fig. 4. Specifically, the battery pack 40 has the same terminal portion 33, a pair of slide rails 34, and an unlock button 35 (see Fig. 4) as the battery pack 30.

[0065] 8, the battery pack 40 differs from the battery pack 30 in that the thickness dimension t1 of the battery pack 40 in the left-right direction of the electric hammer 10 is approximately half the thickness dimension t2 (see FIG. 4) of the battery pack 30 (t1≈t2 / 2). The voltage of the large battery pack 30 is 36V, and the voltage of the small battery pack 40 is 18V.

[0066] As described above in detail, according to the electric hammer 10 of embodiment 1, the housing 20 has a first wall portion 27 having a first wall surface 27a, a second wall portion 28 having a second wall surface 28a facing the first wall surface 27a in the left-right direction of the electric hammer 10, and a single battery storage chamber BR provided between the first wall portion 27 and the second wall portion 28 and capable of accommodating a battery pack 30, and the first wall surface 27a is provided with a first connection terminal portion 27b to which the battery pack 30 can be electrically connected, and the second wall surface 28a is provided with a second connection terminal portion 28b to which the battery pack 30 can be electrically connected.

[0067] This allows the pair of battery packs 30 to be accommodated in a single battery storage chamber BR, thereby preventing the housing 20 from becoming larger. Furthermore, the pair of battery packs 30 can be surrounded by the first and second wall portions 27, 28, protecting the pair of battery packs 30 from external impacts. This improves the convenience of the electric hammer 10.

[0068] Furthermore, according to the electric hammer 10 of embodiment 1, the housing 20 has a second bridging portion 25b with a third wall surface 25c facing downward in the up-down direction intersecting the left-right direction of the electric hammer 10, and the second bridging portion 25b, together with the first wall portion 27 and the second wall portion 28, defines a single battery storage chamber BR, and the single battery storage chamber BR is open on the lower side in the up-down direction of the electric hammer 10 and closed on the upper side by the second bridging portion 25b.

[0069] This prevents the battery pack attachment section 26 from becoming larger, and allows the pair of battery packs 30 to be surrounded from three directions (left, right, and top), thereby adequately protecting the pair of battery packs 30 from external impacts. This further improves the convenience of the electric hammer 10.

[0070] Furthermore, according to the electric hammer 10 of embodiment 1, the housing 20 has a handle portion 25 on the side opposite to the side on which the single battery storage chamber BR of the second bridging portion 25b is provided, and the handle portion 25 extends along the vertical direction of the electric hammer 10.

[0071] This allows the pair of battery packs 30, which are heavy, to be placed near the handle portion 25 that is held by the operator, thereby optimizing the weight distribution of the electric hammer 10. This improves the operability of the electric hammer 10 and minimizes the burden on the operator.

[0072] Furthermore, according to the electric hammer 10 of embodiment 1, the tip tool 11 is formed in a rod shape extending in the front-to-rear direction that intersects both the left-to-right and up-to-down directions of the electric hammer 10, and the handle portion 25 is arranged so as to intersect with the axis C of the tip tool 11.

[0073] This allows vibrations and the like of the tool bit 11 to be transmitted directly to the handle portion 25 on the axis C, thereby further reducing the burden on the operator. This makes it possible to improve the operability of the electric hammer 10.

[0074] Furthermore, according to the electric hammer 10 of embodiment 1, when viewed from below or above the electric hammer 10 in the vertical direction, the housing 20 has slits SL connecting the single battery storage chamber BR to the outside between the first wall portion 27 and the second bridging portion 25b along the left-right direction of the electric hammer 10, and between the second wall portion 28 and the second bridging portion 25b along the left-right direction of the electric hammer 10.

[0075] This allows the unlock button 35 of the battery pack 30 to be exposed in the slit SL, thereby making it possible to easily attach and detach the battery pack 30 to and from the battery pack attachment portion 26. Furthermore, the provision of the slit SL allows the weight of the housing 20 to be reduced.

[0076] Furthermore, according to the electric hammer 10 of embodiment 1, the housing 20 has a housing wall portion 29 with a fourth wall surface 29a facing rearward in the front-to-rear direction that intersects with both the left-right direction and the up-down direction of the electric hammer 10, and the housing wall portion 29, together with the first wall portion 27, the second wall portion 28 and the second bridging portion 25b, defines a single battery storage chamber BR, and the single battery storage chamber BR is open on the rear side in the front-to-rear direction of the electric hammer 10 and is blocked on the front side by the housing wall portion 29.

[0077] This surrounds the pair of battery packs 30 from four directions (front, left, right, and top), further protecting the pair of battery packs 30 from external impacts. On the other hand, by opening the bottom side in the up-down direction and the rear side in the front-to-back direction of the electric hammer 10, the weight of the housing 20 can be reduced, and the pair of battery packs 30 can be easily attached and detached, improving convenience.

[0078] Furthermore, according to the electric hammer 10 of embodiment 1, the first connection terminal portion 27b and the second connection terminal portion 28b each have rail portions 27c, 28c extending in the front-to-rear direction of the electric hammer 10, and the battery pack 30 is slidably attached to the rail portions 27c, 28c.

[0079] This allows the battery pack 30 to be easily attached along the rails 27c and 28c, and also allows the terminals 33 of the battery pack 30 to be reliably electrically connected to the first and second connection terminals 27b and 28b, respectively, thereby improving workability.

[0080] Furthermore, according to the electric hammer 10 of embodiment 1, the rear end T2 of the second bridging portion 25b in the front-to-rear direction is positioned rearward in the front-to-rear direction from the rear end T1 of the first and second wall portions 27, 28 in the front-to-rear direction.

[0081] This prevents the pair of battery packs 30 from protruding rearward beyond the handle portion 25 in the front-rear direction of the electric hammer 10. This provides even more sufficient protection for the pair of battery packs 30. In addition, the appearance of the electric hammer 10 can be improved.

[0082] Furthermore, according to the electric hammer 10 according to the first embodiment, the first wall surface 27a and the second wall surface 28a are provided parallel to each other.

[0083] This allows a pair of battery packs 30 to be housed in parallel in a single battery housing chamber BR with their respective back surfaces 32 butted together, eliminating the need for dead space inside the single battery housing chamber BR. This allows the battery pack mounting section 26 to be made smaller, further improving convenience.

[0084] <Embodiment 2> Next, an electric hammer 50 according to a second embodiment will be described with reference to the drawings. Note that parts having the same functions as those in the first embodiment described above are given the same reference numerals, and detailed description thereof will be omitted.

[0085] Figure 9 is a view of the electric hammer of embodiment 2 as seen from the left side. Figure 10 is a view corresponding to Figure 3 of the electric hammer in Figure 9. Figure 11 is a view corresponding to Figure 5 of the electric hammer in Figure 9. Figure 12 is a view corresponding to Figure 6 of the electric hammer in Figure 9. Figure 13 is a view corresponding to Figure 7 of the electric hammer in Figure 9.

[0086] Fig. 14 is a partially enlarged view showing Modification 2 in which one battery pack is attached. Fig. 15 is a partially enlarged view of the electric hammer in Fig. 14 as seen from below. Fig. 16 is a partially enlarged view of the electric hammer in Fig. 14 as seen from the rear.

[0087] 9 to 13, the electric hammer 50 of the second embodiment differs from the electric hammer 10 of the first embodiment in that a third connection terminal portion 51 to which the battery pack 30 can be electrically connected is additionally provided on the third wall surface 25c of the second bridging portion 25b. The electric hammer 50 corresponds to the work machine of the present invention.

[0088] Accordingly, in the vertical direction of the electric hammer 50, a connection terminal arrangement space TS with a gap dimension S approximately equal to the thickness dimension of the third connection terminal 51 is formed between the second bridging portion 25b and the first and second wall portions 27, 28. In other words, the electric hammer 50 of the second embodiment has a larger vertical dimension by the gap dimension S than the electric hammer 10 of the first embodiment.

[0089] 11 and 12, the third connection terminal 51 is located slightly forward of the handle 25 and in the center of the single battery housing chamber BR in the left-right direction. Furthermore, as shown in FIGS. 12 and 13, the third connection terminal 51 is covered by the second bridging portion 25b when the electric hammer 50 is viewed from above. Therefore, external impacts are not directly transmitted to the third connection terminal 51.

[0090] Similar to the first and second connection terminal portions 27b, 28b, the third connection terminal portion 51 is provided with a pair of rail portions 52. These rail portions 52 are disposed so as to sandwich the third connection terminal portion 51, and extend in the front-rear direction of the electric hammer 50. A pair of slide rails 34 (see FIG. 4) provided on the battery pack 30 are slidably guided along the pair of rail portions 52.

[0091] As shown in Fig. 10, the electric hammer 50 of the second embodiment can be used in the same manner as the electric hammer 10 of the first embodiment, with the battery packs 30 attached to the first connection terminal portion 27b of the first wall portion 27 and the second connection terminal portion 28b of the second wall portion 28. In Fig. 10, the outline of the battery pack 30 is shown by a thick dashed line to make the arrangement of the battery pack 30 easier to understand.

[0092] In addition, as in Modification 2 shown in Figures 14 to 16, it is also possible to use the electric hammer 50 with the battery pack 30 attached only to the third connection terminal 51 of the second bridging portion 25b. In this case, the battery pack 30 is disposed in the center of the electric hammer 50 in the left-right direction, so that the weight distribution of the electric hammer 10 is optimized and the operability of the electric hammer 10 is improved.

[0093] 14, when the battery pack 30 is attached to the third connection terminal portion 51 of the second bridging portion 25b, the pair of unlocking buttons 35 provided on the battery pack 30 are exposed to the outside through the connection terminal portion arrangement space TS. Therefore, the battery pack 30 can be easily attached to and detached from the third connection terminal portion 51 as well.

[0094] A controller (not shown) installed inside the box-shaped housing 21 detects that the battery pack 30 is attached to the third connection terminal 51, and allows the electric motor 12 (see FIG. 9) to be driven based on the detection result. That is, like the electric hammer 10 of the first embodiment, the electric hammer 50 can be operated for a long time using a pair of battery packs 30, and can also be operated using only one battery pack 30.

[0095] When using only one battery pack 30, the operating time of the electric hammer 50 is shorter than when using two battery packs 30, but the weight of the electric hammer 50 can be reduced, reducing the burden on the operator.

[0096] The second embodiment configured as described above can also achieve the same effects as those of the first embodiment. In addition, the second embodiment can be used in two ways: with a pair of battery packs 30 and with only one battery pack 30, thereby making it possible to meet various needs and further improving convenience.

[0097] The small battery pack 40 (see FIG. 8) shown in the above-mentioned <Modification 1> can also be attached to the electric hammer 50 of the second embodiment.

[0098] The present invention is not limited to the above-described embodiments, and various modifications are possible without departing from the spirit and scope of the present invention. For example, in the above-described embodiments, the main body 24 and the battery pack attachment portion 26 that form the box-shaped housing portion 21 are shown as being integrated with each other. However, the present invention is not limited to this. The main body 24 and the battery pack attachment portion 26 may be separate bodies, with a buffer member made of an elastic material such as rubber interposed between them. In this case, it is possible to suppress transmission of vibrations, etc., from the tool bit 11 to the battery pack attachment portion 26, thereby more reliably protecting the battery packs 30, 40.

[0099] Furthermore, in each of the above-described embodiments, a pair of battery packs 30 are accommodated in parallel in a single battery storage chamber BR with their respective back surfaces 32 butted together, but the present invention is not limited to this, and the pair of battery packs can also be mounted in the battery pack mounting section so that they are inclined relative to each other to match the shape of the battery pack mounting section (single battery storage chamber).

[0100] Furthermore, the working machine of the present invention is not limited to the electric hammers 10, 50 that strike the tip tool 11 as described above, but can also be applied to other working machines, such as a hammer drill that can strike the tip tool while rotating it.

[0101] Furthermore, the material, shape, dimensions, number, installation location, etc. of each component in each of the above-described embodiments are arbitrary as long as they can achieve the present invention, and are not limited to the above-described embodiments. [Explanation of symbols]

[0102] 10...electric hammer (work machine), 11...tip tool, 12...electric motor (motor), 13...motion conversion mechanism, 14...impact unit, 20...housing, 21...box-shaped housing portion, 21a...first housing half, 21b...second housing half, 21c...connected housing body, 22...cylindrical housing portion, 23...tool holding portion, 24...main body portion, 25...handle portion, 25a...first bridging portion, 25b...second bridging portion (third wall portion), 25c...third wall surface, 26...battery pack mounting portion, 27...first wall portion, 27a...first wall surface, 27b...first connection terminal portion, 27c... Rail portion, 28...second wall portion, 28a...second wall surface, 28b...second connection terminal portion, 28c...rail portion, 29...housing wall portion (fourth wall portion), 29a...fourth wall surface, 30...battery pack, 31...surface, 32...back surface, 33...terminal portion, 34...slide rail, 35...unlock button, 40...battery pack, 50...electric hammer (work machine), 51...third connection terminal portion, 52...rail portion, BL...reference position, BR...single battery storage chamber, C...axis, SL...slit, SP...space, SW...switch, T1, T2...end portion, TS...connection terminal portion arrangement space

Claims

1. a tool holding portion that holds a tool tip; a motor that generates a driving force for driving the tool bit; a housing supporting the tool holder and the motor; and The housing includes: a first wall portion having a first wall surface; a second wall portion including a second wall surface facing the first wall surface in a first direction; a single battery accommodating chamber provided between the first wall portion and the second wall portion and capable of accommodating a battery pack; and a first connection terminal portion to which the battery pack can be electrically connected is provided on the first wall surface; a second connection terminal portion to which the battery pack can be electrically connected is provided on the second wall surface; Work equipment.

2. the housing has a third wall portion having a third wall surface facing one side in a second direction intersecting the first direction, the third wall portion defines the single battery chamber together with the first wall portion and the second wall portion; the single battery chamber is open on one side in the second direction and closed on the other side by the third wall portion; The work machine according to claim 1 .

3. the housing has a handle portion on the opposite side of the third wall portion from the side on which the single battery chamber is provided, The handle portion extends along the second direction. The work machine according to claim 2.

4. the bit is formed in a rod shape extending in a third direction intersecting both the first direction and the second direction, The handle portion is provided so as to intersect with the axis of the tool bit. The work machine according to claim 3.

5. When viewed from one side or the other side in the second direction, the housing has slits between the first wall portion and the third wall portion along the first direction and between the second wall portion and the third wall portion along the first direction, the slits connecting the single battery accommodating chamber to the outside. The work machine according to claim 2.

6. a third connection terminal portion to which the battery pack can be electrically connected is provided on the third wall surface; The work machine according to claim 2.

7. the housing has a fourth wall portion including a fourth wall surface facing one side of a third direction intersecting both the first direction and the second direction, the fourth wall portion defines the single battery chamber together with the first wall portion, the second wall portion, and the third wall portion; the single battery chamber is open on one side in the third direction and closed on the other side by the fourth wall portion; The work machine according to claim 2.

8. the first connection terminal portion and the second connection terminal portion each have a rail portion extending in the third direction, The battery pack is slidably attached to the rail portion. The work machine according to claim 7.

9. an end portion of the third wall portion on one side in the third direction is disposed on the one side in the third direction of ends of the first wall portion and the second wall portion on one side in the third direction; The work machine according to claim 7.

10. The first wall surface and the second wall surface are provided parallel to each other. A work machine according to any one of claims 1 to 9.

11. A motor; a housing supporting the motor; and The housing includes: a first wall portion having a first wall surface; a second wall portion including a second wall surface facing the first wall surface in a first direction; a third wall portion including a third wall surface facing one side in a second direction intersecting the first direction; a fourth wall portion including a fourth wall surface facing one side of a third direction intersecting both the first direction and the second direction; and the first wall portion, the second wall portion, the third wall portion, and the fourth wall portion cooperate to define a single battery accommodating chamber capable of accommodating a battery pack; a first connection terminal portion to which the battery pack can be electrically connected is provided on the first wall surface; a second connection terminal portion to which the battery pack can be electrically connected is provided on the second wall surface; The single battery compartment includes: one side in the second direction is open and the other side is closed by the third wall portion, One side in the third direction is open, and the other side is closed by the fourth wall portion. Work equipment.

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