Striking tool

Abstract

To provide a construction technology which contributes to rationalization of an arrangement structure and operability of a member, concerning an impact tool normally performing a striking operation while facing downward due to self-weight.SOLUTION: An impact tool 100 has a drive mechanism in which a worker grips a pair of handles 130 with left and right hands respectively and a striking operation is performed while being suspended due to self-weight, and which drives a tip end tool in a first direction D1, and a motor. A motor output shaft is provided so as to extend in a third direction defined as a thickness direction intersecting both of the first direction D1 and a second direction D2. A battery installing portion 123 is provided in a side area 114 in the second direction D2 of the body portion 110. The battery installing portion 123 is installed with a battery 150 feeding the motor.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present disclosure relates to a striking tool called a so-called large hammer, which is normally in a state of hanging down by its own weight and performing a striking operation downward.

Background Art

[0002] An example of a striking tool is disclosed, for example, in Japanese Patent Application Laid-Open No. 2016-165783 (Patent Document 1). This Patent Document 1 discloses a technique related to the optimization of the battery arrangement in a cordless large hammer.

[0003] By the way, because a large hammer is heavy, large in size, and has a large output, there is a high demand for rationalizing the arrangement of components and the operability. In particular, as part of recent technology development that emphasizes ESG (or SDGs), there is a strong demand for reducing environmental impact, high efficiency, and ergonomic design, and the development of large hammers is no exception.

[0004] In a cordless large hammer, from the viewpoints of increasing output and improving efficiency, the battery also tends to be larger in capacity and size, and furthermore, product development assuming the installation of a plurality of battery packs is also progressing. Under such circumstances, it is necessary to pursue not only the optimization of the battery placement location but also the structural rationalization of the entire tool.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In view of the above, an object of the present invention is to provide a construction technique that contributes to the rationalization of the arrangement and operability of members for a striking tool that normally performs a striking operation in a state of facing downward due to its own weight.

Means for Solving the Problems

[0007] To solve the above problems, according to one aspect (Aspect 1) of the present disclosure, a long main body portion having a tool holder in the tip region, and when the longitudinal axis direction of the main body portion is defined as the first direction and the width direction intersecting the first direction is defined as the second direction, a pair of handles extending in the second direction, and an operator holds the pair of handles with the left and right hands respectively and in a state of being suspended by its own weight, a striking tool in which a striking operation is performed through a tip tool removably attached to the tool holder, a drive mechanism for driving the tip tool in the first direction, and a motor provided with a motor output shaft for driving the drive mechanism, the motor output shaft is provided so as to extend in a third direction defined as a thickness direction intersecting both the first direction and the second direction, and a battery mounting portion is provided in a side region of the main body portion in the second direction, a striking tool is configured in which a battery for supplying power to the motor is mounted on the battery mounting portion.

[0008] The striking tool is typically a striking tool that normally performs a striking operation in a state of facing downward due to its own weight, that is, it is preferably applied to a large hammer. Especially in a large hammer, in order to ensure a large output, the battery is likely to be increased in capacity and size, and it is important to rationalize the arrangement of the battery and the configuration of the tool body side where the battery is mounted.

[0009] Therefore, in the impact tool, the output shaft of the motor is provided so as to extend in a third direction defined as a thickness direction intersecting both the first direction and the second direction. That is, with respect to the output shaft, which is most likely to have the largest dimension among the components constituting the motor, it can be configured to extend in the third direction, which is the thickness direction of the impact tool. Along the third direction, as a compensation for allocating the large-dimension part of the motor, which is the output shaft, a space along the second direction, which is the width direction of the impact tool, can be secured as an extended space. Accordingly, a battery mounting portion is provided in the lateral region of the main body portion in the second direction. Even for a relatively large-sized battery, the mounting property is improved by utilizing the largely secured extended space.

[0010] Also, by largely securing the space along the second direction, which is the width direction of the impact tool, a relatively heavy battery can be arranged close to the central axis of the main body portion in the second direction. Therefore, it is possible to avoid an increase in the dimension in the width direction of the impact tool and improve the overall weight balance, including reduction of the couple force.

[0011] According to the present invention, a construction technique contributing to the improvement of the arrangement configuration of members and workability is provided for an impact tool that normally performs an impact operation in a state of facing downward due to its own weight.

Brief Description of the Drawings

[0012]

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Mode for Carrying Out the Invention

[0013] Regarding the above-described configuration, the following exemplary embodiments can be appropriately adopted. Also, a plurality of exemplary embodiments can be combined and appropriately used for the above configuration. (Embodiment 2) The battery mounting portions can be arranged in a pair on both side surfaces of the main body portion in the second direction. Thereby, batteries can be mounted in a pair, and while maintaining the weight balance of the entire impact tool, an increase in the supplied power amount can be achieved.

[0014] Note that "in a pair" means that the battery mounting portions on both side surfaces form a pair, but from the perspective of increasing output and capacity, it does not prevent further separately installing the battery mounting portions. In particular, in relation to a configuration that largely secures the space along the second direction, which is the width direction of the impact tool, the both side surfaces of the main body portion in the second direction are effectively utilized, and the rationality of the member arrangement is further enhanced.

[0015] (Embodiment 3) With a battery mounted on the battery mounting portion, the outer contour of the battery can be arranged within a virtual line connecting the free end region of the handle and the tip region of the main body portion. The "virtual line" here assumes a straight virtual line that shortest connects the free end region of the handle and the tip region of the main body portion. Thereby, it is avoided that the battery mounted on the battery mounting portion protrudes outward unnecessarily and deteriorates the workability, and also battery damage when the impact tool falls can be effectively avoided.

[0016] (Embodiment 4) The handles can each have a gripping portion that extends linearly and is used for an operator to grip. Thereby, a gripping portion structure that is easy to grip with both the left and right hands is ensured, and it can contribute to the improvement of workability.

[0017] (Embodiment 5) When, with respect to the first direction, the direction from the handle to the tool holder is defined as downward and the direction from the tool holder to the handle is defined as upward, the battery mounting portion can be provided in a region directly below the lower side of the handle with respect to the first direction. Thereby, it is possible to improve the weight balance of the impact tool and further improve workability, such as performing battery replacement work while holding the handle.

[0018] (Aspect 6) The battery mounting portion can be configured such that the battery can be slidably mounted in a direction intersecting the first direction. Thereby, since the sliding mounting direction of the battery can be set to intersect with respect to the first direction in which vibration is likely to occur during the impact operation, it is possible to effectively prevent the battery from accidentally falling off due to vibration.

[0019] (Aspect 7) The drive mechanism has a motion conversion mechanism that converts the rotational motion of the motor output shaft into linear motion in the first direction, and the battery mounting portion can be provided in an overlapping manner with respect to the first direction and the motion conversion mechanism. Thereby, it is possible to improve the weight balance of the entire impact tool by concentrating the arrangement of relatively heavy members such as the motion conversion mechanism and the battery.

[0020] (Aspect 8) The motion conversion mechanism can be arranged on the side of the main body portion that is separated from the operator with respect to the third direction. Thereby, it is possible to optimize the arrangement of the relatively heavy member, the motion conversion mechanism, and improve the weight balance of the entire impact tool.

[0021] (Aspect 9) The main body portion can have a battery protector for protecting the outer contour of the battery mounted in the battery mounting region. The battery protector can typically be composed of a cover that covers at least a part of the outer shell of the battery, or a storage box that houses at least a part of the outer shell of the battery. Thereby, it is possible to reliably protect the battery or the battery mounting part from external force.

[0022] (Aspect 10) In the view in the first direction, the pair of handles can each be formed in an annular shape. Thereby, it is possible to contribute to improving the grip of the operator. Note that the "annular shape" can be set from various shapes such as a circular ring shape and a rectangular ring shape. Also, a mode in which the handle itself is formed in an annular shape, a mode in which the main body part and the handle are combined to form an annular shape as a whole, etc. can be adopted.

[0023] Forming the pair of handles in an annular shape further leads to an increase in the range of choices for the operator regarding which part of the handle to grip. Thereby, further improvement in workability based on ergonomic design can be achieved.

[0024] (Aspect 11) In the view in the first direction, the battery mounting part can be provided within the annular part of the pair of handles. That is, the pair of handles can also serve as a guard part against external force for the battery in a state where the battery is mounted on the battery mounting part. Thereby, it is possible to simultaneously improve the grip of the operator and the battery protection ability against external force, which is reasonable.

[0025] Note that the "inside the annular part of the pair of handles" preferably includes both a mode in which the entire battery mounting part is provided within the annular part in the first direction and a mode in which at least a partial region of the battery mounting part is provided within the annular part.

[0026] Hereinafter, with reference to FIGS. 1 to 20, the impact tool 100 according to the present embodiment will be described. In FIGS. 1, 2, and 3, the overall configuration of the impact tool 100 is shown as a front perspective view, a rear perspective view, and a plan view, respectively. Also, FIGS. 4 and 5 show a front sectional view and a side sectional view of the impact tool 100, respectively, FIG. 6 shows a partially enlarged sectional view of a side of the impact tool 100, and FIG. 7 shows a front enlarged sectional view of an upper configuration of the impact tool 100. In this embodiment, for convenience, the side facing the operator is defined as the front of the impact tool 100.

[0027] In this embodiment, for convenience of explanation, the long axis direction (also referred to as the long dimension direction: the vertical direction on the paper surface in FIG. 1) of the impact tool 100 is defined as the first direction D1. Also, the width direction (also referred to as the left - right direction: the left - right direction on the paper surface in FIG. 1) intersecting the long axis direction is defined as the second direction D2. Also, the thickness direction of the impact tool 100, which is a direction orthogonal to the first direction D1 and the second direction D2, is defined as the third direction D3. Furthermore, regarding the first direction D1, the direction downward on the paper surface in FIG. 1 is defined as D1D, and the direction upward on the paper surface is defined as D1U.

[0028] (Overall configuration) As shown in FIGS. 1 to 6, the impact tool 100 generally has, in appearance, a first housing 110 and a second housing 120. The second housing 120 is connected to the upper side of the first housing 110 with respect to the first direction D1 and is relatively movable with respect to the first housing 110. (Configuration of the first housing 110) The first housing 110 is formed in a long shape and has an upper - side drive mechanism accommodating portion 111, a lower - side drive mechanism accommodating portion 112, and a tip region 113. Also, a side region 114 is formed in the second - direction D2 - side portions of the upper - side drive mechanism accommodating portion 111 and the lower - side drive mechanism accommodating portion 112. The upper - side drive mechanism accommodating portion 111, the lower - side drive mechanism accommodating portion 112, and the tip region 113 are arranged in a connected manner from the upper side to the lower side in this order with respect to the first direction D1.

[0029] The upper drive mechanism housing portion 111 mainly houses the motor 210 and the motion conversion mechanism 170. The lower drive mechanism housing portion 112 mainly houses the striking mechanism 180. The motion conversion mechanism 170 and the striking mechanism 180 are configuration examples corresponding to the "drive mechanism". Details of the motor 210, the motion conversion mechanism 170, and the striking mechanism 180 will be described later. In the tip region 113, a tool holder 240 and a retainer 250 are provided. The tool holder 240 is a tool mounting member used for striking work, and the retainer 250 functions as a retaining member for the tip tool mounted on the tool holder 240. In the drawings, for the sake of convenience, the illustration of the tip tool is omitted.

[0030] (Configuration of the second housing 120) The second housing 120 is provided in a connected manner above the first housing 110 in the first direction D1. The second housing 120 has a head case 121, a handle attachment portion 122, and a battery mounting portion 123. The head case 121 constitutes the outer shell of the second housing 120 and mainly houses the controller 260 and the controller case 270 (see also FIGS. 10, 11, etc.). Further, an intake port 127 for cooling air is provided on the top surface portion of the head case 121 in the upward direction D1U in the first direction.

[0031] The handle attachment portion 122 is provided symmetrically with respect to the second direction D2, and is integrally connected to the head case 121, and a handle 130 described later is attached thereto. The battery mounting portions 123 are provided symmetrically with respect to the second direction D2, and are respectively connected to the lower side D1D in the first direction of the handle attachment portion 122, and batteries 150 described later are respectively mounted thereon.

[0032] The battery mounting portion 123 is configured to be arranged in the side region 114 of the first housing 110, that is, in the directly below region 130A of the handle attachment portion 122 of the second housing 120 with respect to the first direction D1. The battery mounting portion 123 also has a slide guide 124 and a power supply terminal 125 when the battery is mounted (see FIG. 4). Each battery mounting portion 123 also has a battery protector 128 for protecting the outer shell of the battery 150 in a state of being mounted on the battery mounting portion 123 from external forces.

[0033] The battery mounting portion 123 including the head case 121, the handle mounting portion 122, and the battery protector 128 is integrally formed in a connected state to form the second housing 120, and is configured to be integrally relatively movable with respect to the first housing 110 in the first direction D1. The detailed configuration of the relative movement of the second housing 120 with respect to the first housing 110 will be described later.

[0034] (Configuration of the handle 130) The handle 130 has a pair of first handle portions 131 and second handle portions 141 that respectively project and extend from the first housing 110 in the second direction D2. Typically, the first handle portion 131 is used for gripping by the right hand of the operator, and the second handle portion 141 is used for gripping by the left hand of the operator. As shown in detail in FIG. 3, the first handle portion 131 has a first handle base portion 132, a first handle grip portion 133, and a free end region 134. A trigger 135 is provided on the first handle grip portion 133. The trigger 135 is constantly biased to the off position, and can be moved to the on position against the biasing force to the off position by manually pressing the trigger 135 while gripping the first handle portion 131. In FIGS. 1 to 4, the trigger 135 in the off position (initial state) is shown.

[0035] When the pressing operation by the operator is released, the trigger 135 returns to the initial state by the biasing force to the off position. As shown in FIG. 4, the trigger 135 is connected to an electric switch 136 provided in the handle mounting portion 122. When the trigger 135 moves to the on position, the electric switch 136 is turned on, and an on signal is sent to a controller 260 described later. The second handle part 141 has a second handle base part 142, a second handle gripping part 143, and a free end region 144.

[0036] (Configuration of battery 150) As shown in FIGS. 1 to 3, the battery 150 has a generally rectangular parallelepiped shape having a battery front surface part 151, a battery upper surface part 152, a battery bottom surface part 153, and a battery rear surface part 154, and is configured as a package body that houses a battery pack composed of a plurality of batteries. In addition, a lock release part 155 is provided in a region of the battery upper surface part 152 close to the battery rear surface part 154. The lock release part 155 is manually operated when removing the battery 150 from the second housing 120. As shown in FIG. 3, the battery 150 is mounted on the battery mounting part 123 of the second housing 120 by sliding in the battery mounting direction 156. Thereby, the battery 150 is electrically connected to the power supply terminal 125 in a state of being engaged with the slide guide 124 in the battery mounting part 123, and is placed in a state where power can be supplied to the impact tool 100.

[0037] The battery mounting direction 156 is defined as a direction that intersects (is orthogonal to) the first direction D1 and the second direction D2, respectively, and is along the third direction D3. On the other hand, the battery 150 is removed from the second housing 120 by sliding in a direction opposite to the battery mounting direction 156 while manually operating the lock release part 155. In other words, the battery mounting direction 156 and the removal direction (the direction opposite to the battery mounting direction 156) are in an intersecting state (orthogonal) with respect to the first direction D1 and the second direction D2.

[0038] The above-described battery protector 128 covers the battery front surface part 151, the battery upper surface part 152, the battery bottom surface part 153 (and a part of the battery side surface part) in a state where the battery 150 is mounted on the battery mounting part 123, and protects the battery 150 from external forces. In other words, the battery protector 128 is configured as a cover member that covers all or part of the front battery portion 151, the upper battery portion 152, and the bottom battery portion 153. Also, as shown in FIG. 4, an LED light 129 that irradiates the tip region 113 or the end of the tip tool is provided on the lower surface (in the downward direction D1D of the first direction) of the battery protector 128. The LED light 129 is one of the functional members that assist in performing the striking operation.

[0039] In the present embodiment, the battery 150 mounted on the battery mounting portion 123, together with the battery protector 128, is configured to be disposed inside an imaginary line HL (on the side closer to the striking tool 100 than the imaginary line HL) that connects the free end regions 134 and 144 of the first handle portion 131 and the second handle portion 141 and the tip region 113 of the first housing 110, as shown in FIG. 4. Thereby, it is avoided that the battery 150 and the battery protector 128 mounted on the battery mounting portion 123 interfere with the striking operation. Also, in the unlikely event that the striking tool 100 falls, the battery 150 (and the battery protector 128) can avoid the impact during the fall by being disposed inside the imaginary line HL assumed as the ground line, and the protective performance against external forces is further improved.

[0040] (Configuration of the motor 210) As shown in FIGS. 5 and 6, the motor 210 mainly includes a stator 211, a rotor 212, an output shaft 213 integrally connected to the rotor 212, and a cooling fan 214 integrally connected to the output shaft 213. In the present embodiment, a centrifugal fan is adopted as the cooling fan 214. Each element of the motor 210 is housed in the motor housing 215 and disposed in the first housing 110. The output shaft 213 is connected to the first intermediate shaft 171 of the above-described motion conversion mechanism 170 on the side opposite to the operator in the third direction D3 so as to be rotationally transmissible at a predetermined reduction ratio, and the rotational output from the motor 210 is transmitted from the output shaft 213 to the motion conversion mechanism 170 via the first intermediate shaft 171. In this embodiment, a brushless motor is adopted as the motor 210 in order to obtain a relatively large output while having a relatively small size. Since the structure of the brushless motor itself belongs to well-known technology, a detailed description thereof is omitted in this specification.

[0041] The output shaft 213 is arranged so as to intersect the first direction D1 and the second direction D2, while extending along the third direction D3. In other words, by arranging the output shaft 213, which is most likely to have the largest dimension among the motors 210, so as to extend facing the third direction D3, which is the thickness direction of the impact tool 100, the largest dimension of the motor 210 is assigned to the third direction D3. Instead, a large space for arranging other functional members is secured along the second direction D2, which is the width direction of the impact tool 100.

[0042] Specifically, as particularly shown in FIGS. 1 and 4, it becomes easier to secure the space in the lateral region 114 in the second direction D2 of the first housing 110. In this embodiment, the extended space S secured in this lateral region 114 is utilized, and as a part of the second housing 120, the battery mounting portion 123 described above is provided. Even when the battery 150 is mounted on the battery mounting portion 123, or even when the battery protector 128 is arranged, the space efficiency is optimized so as not to interfere with the work.

[0043] (Configuration of the motion conversion mechanism 170) As shown in FIGS. 5 and 6, the motion conversion mechanism 170 mainly includes a first intermediate shaft 171, a second intermediate shaft 172, a crank mechanism 173, a cylinder 174, a piston 175, an air chamber 176, and a vibration damping mechanism 177. As described above, the first intermediate shaft 171 is rotatably connected to the output shaft 213 of the motor 210, and further, the first intermediate shaft 171 is rotatably connected to the second intermediate shaft 172 at a predetermined reduction ratio. The second intermediate shaft 172 is integrally connected to the crank mechanism 173 and is also rotatably connected so as to be able to drive the vibration damping mechanism 177.

[0044] The crank mechanism 173 converts the rotational motion of the second intermediate shaft 172 around the third direction D3 into linear motion in the first direction D1, linearly reciprocating the piston 175 in the first direction D1. The linear motion of the piston 175 causes pressure fluctuations in the air chamber 176 within the cylinder 174.

[0045] The vibration damping mechanism 177 has a counterweight 178 that linearly reciprocates in the first direction D1 along the outer circumference of the cylinder 174. The counterweight 178 operates against the impact operation by the impact mechanism 180 described below and is a member that suppresses the vibration generated in the impact tool 100 during the impact operation.

[0046] (Configuration of the impact mechanism 180) As shown in FIGS. 5 and 6, the impact mechanism 180 is mainly composed of a striker 181 and an impact bolt 182. As described above, when pressure fluctuations occur in the air chamber 176 within the cylinder 174, the striker 181, which is disposed in the cylinder 174 opposite the piston 175 with the air chamber 176 interposed therebetween, linearly moves in the first direction D1, linearly moving the impact bolt 182 in the first direction D1.

[0047] Thereby, the impact bolt 182 linearly moves the tip tool (not shown for simplicity) mounted in the tool holder 240, and the impact operation in the first direction D1 is performed by the tip tool. Note that the retention of the tip tool in the first direction D1 is performed by the retainer 250. The retainer 250 is configured to be movable between the retaining position of the tip tool (corresponding to FIG. 5) and the release position by rotating around the rotation center 251 in FIG. 5.

[0048] (Configuration of the first sliding guide member 190) As described above, the first housing 110 and the second housing 120 are configured to be relatively movable in the first direction D1. And in the present embodiment, as shown in FIGS. 7 to 9, a first sliding guide member 190 and a second sliding guide member 200 are provided to smooth the relative movement operation. The first sliding guide member 190 is provided at a position close to the handle 130 (a position substantially at the same height as the handle 130) with respect to the first direction D1. The first sliding guide member 190 includes a pipe-shaped member 191 which is a component on the side of the first housing 110, and a bifurcated member 192 which is a component on the side of the second housing 120. The bifurcated member 192 is a member having a bifurcated portion that branches into two branches, and is also referred to as a forked member or a bifurcated member (forked member or bifurcated member). The pipe-shaped member 191 is made of metal, formed in a circular cross-section, and fixedly arranged on the first housing 110 such that its major axis faces the first direction D1. The bifurcated member 192 is made of resin and is integrally fixed to the handle 130 with respect to the handle attachment portion 122 of the second housing 120. The bifurcated member 192 is arranged in a loosely fitting manner on the pipe-shaped member 191 with the bifurcated portion along the outer peripheral surface of the pipe-shaped member 191, and is configured to be slidably relatively movable in the first direction D1 with respect to the pipe-shaped member 191. In the present embodiment, a plurality of first sliding guide members 190 are arranged around the first direction D1 (as shown in FIG. 8, two are arranged oppositely and in a pair).

[0049] (Configuration of the second sliding guide member 200) The second sliding guide member 200 is arranged on the lower side D1D in the first direction than the above-described first sliding guide member 190. Specifically, it is provided at a position close to the battery 150 (a position substantially at the same height as the battery 150) with respect to the first direction D1. The second sliding guide member 200 includes a convex member 201, a concave member 202, and a sliding guide 203.

[0050] The convex member 201 is made of resin, fixedly provided on the side of the first housing 110, and is configured to protrude outward in the second direction D2 as shown in FIG. 9. The concave member 202 is made of resin, provided on the side of the second housing 120, and fits with the convex member 201 in a state slidable relative to the first direction D1 as shown in FIG. 9. The sliding guide 203 is formed by bending a thin plate-shaped sheet metal. As shown in FIG. 9, it is welded and fixed to the first housing 110 and is interposed between the convex member 201 and the concave member 202 to guide the relative sliding operation of the convex member 201 and the concave member 202 while reinforcing the rigidity. Furthermore, in the present embodiment, a plurality of second sliding guide members 200 are arranged around the first direction D1 (as shown in FIG. 9, two are arranged oppositely and symmetrically).

[0051] A buffer member 205 is provided on the second sliding guide member 200. The buffer member 205 is capable of abutting against the buffer member abutting seat 126 on the side of the second housing 120. The buffer member abutting seat 126 has a wedge-shaped cross section and is integrally formed with the battery mounting portion 123 of the second housing 120. The buffer member 205 is formed of an elastic body such as rubber, urethane, or sponge, and is fixedly attached to the first housing 110. Specifically, the buffer member 205 is provided on the back surface side of the convex member 201 as shown in FIG. 9. When the first housing 110 and the second housing 120 move relatively in a direction approaching each other, the buffer member 205 is compressed by the buffer member abutting seat 126 on the side of the second housing 120. And the relative movement operation between the first housing 110 and the second housing 120 is buffered by the compression.

[0052] The impact tool 100 according to the present embodiment further has a stopper 204. As shown in FIG. 7, the stopper 204 receives the bifurcated member 192 on the side of the second housing 120 to define the maximum distance of relative movement (i.e., the movable stroke distance) between the first housing 110 and the second housing 120 in the first direction D1.

[0053] (Arrangement of a plurality of sliding guide members) In the present embodiment, with respect to the first direction D1, the first sliding guide member 190 constitutes a handle-proximity-side sliding guide member, and the second sliding guide member 200 constitutes a handle-separation-side sliding guide member. The relative movement operation of the first housing 110 and the second housing 120 is supported by a plurality of sliding guide members in the first direction D1, thereby ensuring the stability of the operation. Also, as shown in FIGS. 8 and 9, a plurality of the first sliding guide members 190 and the second sliding guide members 200 are respectively arranged around the first direction D1, further ensuring the stability of the relative movement operation of the first housing 110 and the second housing 120.

[0054] (Vibration isolation structure) As shown in FIGS. 4 and 7, the first housing 110 and the second housing 120 are configured to be able to relatively move (proximity and separation) with respect to each other in the first direction D1 in a state where a biasing force acts, with the first elastic body 161 and the second elastic body 162 interposed therebetween. In the first elastic body 161 and the second elastic body 162 in the present embodiment, metal coil springs are respectively used. Alternatively, for example, leaf springs, rubber, soft resins, actuators, etc. can also be used.

[0055] The first elastic body 161 is interposed between the first housing 110 and the second housing 120 below the first direction D1 with respect to the handle 130. In the present embodiment, the first elastic body 161 is configured as a pair structure. As shown in FIG. 7, the lower end portion of the first elastic body 161 is attached to a first elastic body mounting seat 120A provided in the upper-side drive mechanism accommodating portion 111. On the other hand, the upper end portion of the first elastic body 161 is placed in a free end state while the pressing seat 120C is attached. The pressing seat 120C has an L-shaped cross section in a front view in FIG. 7, and the bottom of the L-shaped cross section is fitted to the upper end portion of the first elastic body 171. On the other hand, the upper end portion of the L-shaped cross section is disposed opposite to the bifurcated member 192 on the first housing 110 side.

[0056] Before the impact operation is started (initial state), the upper end of the pressing seat 120C and the bifurcated member 192 of the first sliding guide member 190 are arranged to face each other with a predetermined clearance 190CL therebetween. In the present embodiment, the clearance 190CL is set to 2 millimeters (2 mm).

[0057] When the first housing 110 moves downward in the first direction D1D and approaches the second housing 120, first, the bifurcated member 192 descends along the pipe-shaped member 191 by a distance corresponding to the clearance 190CL and contacts the upper end of the pressing seat 120C of the first elastic body 161.

[0058] Furthermore, as the first housing 110 moves downward in the first direction D1D, the bifurcated member 192 compresses the first elastic body 161 via the pressing seat 120C. As a result, the biasing force of the second elastic body 162 generated in response to the compression acts between the first housing 110 and the second housing 120.

[0059] In the present embodiment, the first elastic body 161 is disposed between the first sliding guide member 190, which is a sliding guide member on the handle proximity side, and the second sliding guide member 200, which is a sliding guide member on the handle separation side, with respect to the first direction D1. Therefore, the biasing force can be applied in a so-called both-end supported state, and adverse effects (such as the generation of tilting force during relative movement) due to components of the biasing force other than the first direction D1 are avoided. Also, the first elastic body 161 is disposed in the region directly below the first sliding guide member 190 in the first direction D1, and the anti-vibration effect on the handle 130 is improved.

[0060] On the other hand, in the present embodiment, the second elastic body 162 is interposed between the first housing 110 and the second housing 120 on the upper side in the first direction D1U with respect to the handle 130. In the present embodiment, the second elastic body 162 is configured as a pair structure (see also FIG. 10, etc.). One end of each second elastic body 162 (on the upper side D1U in the first direction) is attached to the second elastic body mounting portion 278 (on the side of the second housing 120) of the controller case 270. The detailed structure of the controller case 270 is also shown in FIGS. 12 and 13. On the other hand, the other end of each second elastic body 162 (on the lower side D1D in the first direction) is attached to the second elastic body mounting seat 120B (on the side of the first housing 110). Thus, the second elastic body 162 is interposed between the first housing 110 and the second housing 120.

[0061] When the operator presses the handle 130 downward in the first direction D1D while holding the handle 130, the second housing 120 integrated with the handle 130 is configured to relatively move downward in the first direction D1D against the biasing force of the second elastic body 162 and approach the first housing 110.

[0062] The first elastic body 161 and the second elastic body 162 are "Elastic coefficient of the first elastic body 161 > Elastic coefficient of the second elastic body 162" set so as to satisfy the above condition. Specifically, the first elastic body 161 (a coil spring in the present embodiment) is determined to have a relatively large elastic coefficient so that vibrations generated on the first housing 110 side during the impact operation can be effectively suppressed from being transmitted to the second housing 120 side, that is, the vibration isolation housing structure of the impact tool 100 can be sufficiently ensured.

[0063] On the other hand, the second elastic body 162 is (1) When the impact operation is not performed, it is sufficient to hold the second housing 120 and the weight equivalent to the weight of each functional member and the battery 150 mounted on the second housing, that is, the heavy object on the second housing 120 side, in a state separated from the first housing 110, and (2) When starting the striking operation, the operator presses the handle 130 downward in the first direction D1D so that the second housing 120 can move relative to the first housing 110 side, in other words, the elastic constant is determined such that the second housing 120 can be easily pressed manually toward the first housing 110 side.

[0064] (Internal structure of the first housing 110 with the head case 121 removed) The upper internal structure of the striking tool 100 with the head case 121 shown in FIG. 1 removed is shown in FIGS. 10 and 11.

[0065] FIG. 10 shows the upper internal structure of the striking tool 100 with the head case 121 removed as viewed from the front right side. On the other hand, FIG. 11 shows the upper internal structure of the striking tool 100 with the head case 121 removed as viewed from the front left side. On the upper side in the first direction D1U, the second housing 120 connected to the first housing 110 holds the controller 260, the controller case 270 that holds the controller 260, the main power switch 281, the communication unit 282, and the detection mechanism 290.

[0066] The controller 260 is a member mainly responsible for driving and controlling the above-described motor 210. The controller 260 is configured as an assembly that houses a control board and has heat dissipation fins 261 formed on the upper surface, that is, a control board assembly. The control board mainly has a CPU, a memory, etc. The main power switch 281, the communication unit 282, and the detection mechanism 290 all constitute a functional member 280 for assisting in performing the striking operation by the striking tool 100.

[0067] The second housing 120 is connected to the first housing 110 with the second elastic body 162 interposed therebetween while holding the above-described members. The biasing force of the second elastic body 162 acts on both the first housing 110 and the second housing 120 with respect to the first direction D1.

[0068] On one hand, at the upper end of the first housing 110 on the upper side D1U in the first direction, the motor housing 215 that houses the motor 210 is held. A duct cover 220 is connected to the motor housing 215. As shown in FIG. 6, the duct cover 220 is connected to the motor housing 215 in the end region on the side opposite to the cooling fan 214 among both end portions of the output shaft 213 of the motor 210. Also, as shown in FIG. 11, a duct member 230 is connected between the duct cover 220 and the controller case 270.

[0069] Hereinafter, the detailed configurations of each member will be described in order. (Configuration of the controller case 270) The detailed configuration of the controller case 270 is shown in FIGS. 12 and 13. Among them, FIG. 12 is a perspective view of the upper surface side of the controller case 270, and FIG. 13 is a perspective view of the bottom surface side of the controller case 270. The controller case 270 is mainly composed of a frame 271 having a frame structure that functions as a holding portion of the controller 260. A duct member mounting portion 272, a head case mounting portion 273, a detection mechanism mounting portion 274, a main power switch mounting portion 275, a communication unit mounting portion 276, a wire harness insertion opening 277, and a second elastic body mounting portion 278 are integrally formed on the frame 271. Although not particularly shown, lead wires (electric wires) for electrically connecting the controller 260 to the battery 150, the motor 210, the electric switch 136, etc. are inserted and held in the wire harness insertion opening 277. The lead wires can be either a single wire (single) or a state in which a plurality of wires are bundled.

[0070] (Configuration of the duct cover 220) The detailed structure of the duct cover 220 is shown in FIGS. 14 and 15 as perspective views. FIG. 14 is a front side perspective view of the duct cover 220, and FIG. 15 is a perspective view of the duct cover 220 viewed from the side of the motor 210 which is the adherend member. The duct cover 220 has an internal space 221, a motor mounting seat 222, a flange 223, a cooling air induction path 224, and a duct member mounting portion 225. The cooling air that has cooled the above-described controller 260 is configured to be sent to the motor 210 through the duct member mounting portion 225, the cooling air induction path 224, and the internal space 221 of the duct cover 220 (see also FIG. 11).

[0071] The duct cover 220 configured in this way is screwed to the motor housing 215 using the motor mounting seat 222 (see FIGS. 10 and 11 together). As shown in FIG. 6, the duct cover 220 is attached to the motor housing 215 on the end side (operator side) opposite to the end of the output shaft 213 of the motor 210 where the cooling fan 214 is attached, with respect to the third direction D3. Therefore, when the cooling fan 214 rotates together with the output shaft 213, the cooling air is sent to the motor housing 215 through the duct member mounting portion 225, the cooling air induction path 224, and the internal space 221 in the duct cover 220 shown in FIG. 15 due to the axial flow action of the cooling fan 214, and further flows through the inside of the motor housing 215 in the third direction D3 along the output shaft 213. Thereby, the motor 210 housed in the motor housing 215 is configured to be cooled.

[0072] (Configuration of the duct member 230) Details of the duct member 230 are shown as shown in FIGS. 11, 16, and 17. Among these, FIG. 16 is a second-direction cross-sectional view of the left side surface cut in the first direction D1 so as to pass through the central axis of the first end portion 232 of the duct hose 231 in FIG. 11, and FIG. 17 is a second-direction cross-sectional view of the left side surface cut in the first direction D1 so as to pass through the central axis of the second end portion 233 of the duct hose 231 in FIG. 11. The duct member 230 is a member for supplying the cooling air that has cooled the controller 260 to the motor housing 215, and is mainly composed of a duct hose 231.

[0073] The duct hose 231 has its first end 232 connected to the duct member mounting portion 272 of the controller case 270 (see also FIGS. 12 and 13), and its second end 233 connected to the duct member mounting portion 225 of the duct cover 220. As a result, the duct member 230 will be disposed in an intervening manner between the first housing 110 and the second housing 120.

[0074] As shown in FIG. 16, the first end 232 of the duct hose 231 is directly and fittingly attached to the duct member mounting portion 272 of the controller case 270. In other words, the first end 232 is directly fitted to the duct member mounting portion 272 without passing through an auxiliary device such as an adapter (without the intervention of an adapter). Also, as shown in FIG. 17, the second end 233 of the duct hose 231 is directly and fittingly attached to the duct member mounting portion 225 of the duct cover 220 connected to the motor 210. In other words, the second end 233 is directly fitted to the duct member mounting portion 225 without passing through an auxiliary device such as an adapter (without the intervention of an adapter).

[0075] The duct hose 231 in the present embodiment is constituted by a member on which a biasing force acts toward the contraction side so as to return to the initial state when extended from a predetermined initial state. In the present embodiment, a bellows-structured hose is employed. And in the present embodiment, the duct hose 231 in a state extended by a predetermined amount from the initial state is disposed in a connecting manner between the first housing 110 and the second housing 120. Therefore, the duct hose 231 is placed in a state where a biasing force constantly acts toward the contraction side so as to return to the initial state. From this, since the duct hose 231 always tries to contract, it will not be slackened uselessly inside the impact tool 100, and even when the first housing 110 and the second housing 120 move relative to each other, a structure can be obtained that can avoid rubbing and wearing against other members. Specifically, by adopting the anti-vibration structure, the connection distance between the first housing 110 and the second housing 120 by the duct hose 231 is shortened compared to the initial state. In this case, if no biasing force towards the contraction side is generated in the duct hose 231, unnecessary slack will occur in the duct hose 231 due to the shortening of the connection distance, and this slack will cause rubbing with other members. In the present embodiment, by adopting the duct hose 231 with a biasing force acting on the contraction side so as to return to a predetermined initial state, such a problem can be prevented.

[0076] Also, as shown in FIG. 11, the cross-section of the first end portion 232 of the duct hose 231, that is, the end portion on the side of the controller case 270 which is the upper side in the first direction D1U, is a surface formed in the second direction D2 and the third direction D3. In other words, the central axis on the upper end side of the duct hose 231 is configured to be along the first direction D1. On the other hand, the cross-section of the second end portion 233 of the duct hose 231, that is, the end portion on the side of the duct cover 220 which is the lower side in the first direction D1D, is a surface formed in the first direction D1 and the second direction D2. In other words, the central axis on the lower end side of the duct hose 231 is configured to be along the third direction D3.

[0077] As a result, the cross-sections of the first end portion 232 and the second end portion 233 are configured to intersect with each other. That is, the central axis of the first end portion 232 is along the first direction, and the central axis of the second end portion 233 is along the second direction D2, so that the central axes of each other are in an intersecting shape (substantially orthogonal shape). This configuration is advantageous from the viewpoint of avoiding twisting and unnecessary tension addition of the duct hose 231 when the duct hose 231 is connected and arranged between members whose relative distance changes in particular in the anti-vibration structure where the first housing 110 and the second housing 120 relatively move.

[0078] Also, the first end portion 232 of the duct hose 231 is configured to be located in the proximity upper region of the cooling fan 214 of the motor 210 (also refer to FIGS. 4, 5, etc. together). Furthermore, as shown in FIG. 16 and the like, in the head case 121, at least a cooling air intake port 127A is provided so as to correspond to the end portion on the side facing the duct member mounting portion 272 of the controller case 270. The cooling air intake port 127A is configured such that the cooling effect of the controller 260 is improved by the long flow of the cooling air from the cooling air intake port 127A to the first end portion 232 of the duct hose 231 attached to the duct member mounting portion 272 located at the opposite end portion. In the present embodiment, not only the end portion on the side facing the duct member mounting portion 272 but also a cooling air intake port 127 is formed at the central portion of the top surface of the head case 121, thereby improving the intake efficiency of the cooling air. Also, as shown in FIG. 11, the duct hose 231 is placed in a state where the curved shape at the approximate center is maintained by the duct portion guide rib 116 provided on the motor housing 215.

[0079] (Configuration of the functional member 280) In the present embodiment, as shown in FIGS. 3, 10, and 11, as an example of various functional members 280 that assist in performing the striking operation by the striking tool 100, a main power switch 281, a communication unit 282, and a detection mechanism 290 are provided. The main power switch 281 is a start switch for energizing the striking tool 100. When the operator manually turns on the main power switch 281, the drive control of the striking tool 100 by the controller 260 is started via power supply from the battery 150. When the main power switch 281 is manually turned to the on position, basically, the on position is maintained until the operator manually performs a return operation to the off position. However, in the present embodiment, from the viewpoint of energy saving and the like, it is set that when the no-operation state continues for 60 seconds after the on position is turned on, the main power switch 281 automatically returns to the off position. Also, when the main power switch 281 is turned on, the operator can visually recognize the turned-on state by the lighting of the operation lamp.

[0080] The communication unit 282 is a member for sending a drive control signal to an attachment member (auxiliary machine) that is used for a striking operation together with the striking tool 100. In this embodiment, a dust collector is used as the attachment member. As the communication method, Wifi, Bluetooth, etc. are used.

[0081] (Configuration of the detection mechanism 290) Furthermore, the configuration of the detection mechanism 290, which is one of the components of the functional member 280, will be described. The basic configuration of the detection mechanism 290 is shown in FIGS. 18 and 19. The detection mechanism 290 includes an assembly body base 291, a movable member 292 provided with a magnetic body, a movable member biasing elastic body 293, and a magnetic sensor 294. The detection mechanism 290 is attached to the detection mechanism attachment portion 274 (also refer to FIGS. 12 and 13) of the controller case 270. The detection mechanism 290 is connected to the controller 260 by a wire harness (not shown for convenience) (refer to FIG. 10, etc.).

[0082] The movable member 292 is movable in the first direction D1 while being held by the assembly body base 291. The movable member biasing elastic body 293 is interposed between the movable member 292 and the assembly body base 291, and constantly applies a biasing force to the movable member 292 in the downward direction D1D of the first direction. As shown in FIG. 19, the lower end portion of the movable member 292 faces the upper end portion of the duct cover 220, and in the initial state before the striking operation is performed, it is configured to form a predetermined clearance 290CL. In this embodiment, the clearance 290CL is set to 1 mm (millimeter).

[0083] In this embodiment, in the initial state, the state where the sensor 294 detects the magnetism of the movable member 292 is maintained. In other words, for the state where the sensor 294 detects the magnetism on the movable member 292 side, the controller 260 determines that the detection mechanism 290 is in the initial state. On the one hand, as shown in FIG. 20, when the first housing 110 and the second housing 120 move relative to each other so as to approach each other, the clearance 290CL disappears with this relative movement, and the lower end portion of the movable member 292 and the upper end portion of the duct cover 220 are placed in a contact state.

[0084] From this state, when the first housing 110 and the second housing 120 further move relative to each other so as to approach each other, the duct cover 220 is configured to push up the movable member 292 in the first upward direction D1U while resisting the biasing force of the movable member biasing elastic body 293. When the movable member 292 moves in the first upward direction D1U, the detection of magnetism is canceled (magnetism is no longer detected) in the sensor 294, and the controller 260 performs pressing detection of the striking tool 100 through the detection mechanism 290. That is, the detection mechanism 290 serves as a so-called push-drive sensor. In the present embodiment, the striking tool 100 is switched from the no-load driving state to the load driving state by this pressing detection, but the detailed operation mode will be described later.

[0085] (Operation mode of the striking tool 100 according to the present embodiment) Hereinafter, the operation mode of the striking tool 100 according to the present embodiment will be described. The striking tool 100 according to the present embodiment is configured as a so-called large hammer, and in a state of hanging down by its own weight, the working mode of performing a striking operation downward is the normal state. Here, the so-called "hanging down" or "downward" includes not only the direction completely coinciding with the first downward direction D1D but also other direction components.

[0086] (Power-on of the motor 210: Soft no-load start) When an operator performs a striking operation using the striking tool 100, first, the handle 130 is held by hand, and the striking tool 100 is placed in a state of hanging down by its own weight (a state in which the tool holder 240 faces the first downward direction D1D), and the main power switch 281 is manually turned on. Furthermore, while holding the handle 130, the operator manually actuates the trigger 135. Based on the actuation of the main power switch 281 and the trigger 135, the controller 260 rotationally drives the motor 210 at a predetermined first speed (first rotational speed) R1.

[0087] As a specific set value of the first speed R1, for example, it is determined according to an idling setting that can appropriately reduce power consumption while preparing for a smooth transition to a subsequent normal driving operation (load driving state). And by setting this first speed R1 in a relatively low speed range, it is configured to reduce the vibration generated in the impact tool 100 via the vibration damping mechanism 177 as much as possible. This will be described later.

[0088] Making the actuation of both the main power switch 281 and the trigger 135 the energization driving conditions for the motor 210 is to thoroughly prevent malfunction of the impact tool 100. Also, from the perspective of thoroughly preventing malfunction, it is set that even if the trigger 135 is actuated before the main power switch 281 is actuated, it will not be energized and driven. In the present embodiment, as described above, a brushless motor is adopted for the motor 210, and upon receiving the actuation of the main power switch 281 and the trigger 135, the controller 260 performs drive control of the motor 210 by so-called PWM control.

[0089] (Definition of the no-load driving state of the impact tool 100) In the present embodiment, a state where the motor 210 is driven and the second housing 120 is not being pressed against the first housing 110 is defined as the "no-load driving state". This "no-load driving state" can also be defined as the following state. That is (1) The initial state before the start of the impact operation. (2) A state where no load other than its own weight acts on the tip tool, that is, the tip tool is not intentionally pressed against the work piece to be processed (excluding its own weight) and is driven in a "no-load" state. Or (3) The state where the operator is not pressing the handle 130, that is, the state where no relative movement operation is performed between the first housing 110 and the second housing 120, or the state where neither the first elastic body 161 nor the second elastic body 162 is compressed. Note that this no-load driving state is also referred to as the "no-load driving state" or the like.

[0090] (Operation of the motion conversion mechanism 170) When the motor 210 is rotationally driven, as shown in FIGS. 5 and 6, the rotational output of the output shaft 213 of the motor 210 around the third direction D3 is transmitted to the first intermediate shaft 171 and the second intermediate shaft 172, and is converted into a linear motion in the first direction D1 by the crank mechanism 173. As a result, the piston 175 linearly moves in the first direction D1 within the cylinder 174. Similarly, the vibration damping mechanism 177 mainly composed of the counterweight 178 linearly moves in the first direction D1 at a different phase on the outer periphery of the cylinder 174.

[0091] When the impact tool 100 is in the no-load driving state, the impact bolt 182 shown in FIGS. 5 and 6 moves from the position shown in FIGS. 5 and 6 to the tip side in the lower direction D1D of the tool holder 240 by its own weight, and at the same time, the striker 181 also moves to the tip side in the lower direction D1D of the cylinder 174 by its own weight so as to be connected to the impact bolt 182. In other words, in the no-load driving state, the impact bolt 182 and the striker 181 are placed in a state of hanging downward on the lower side in the first direction D1D by their respective self-weights.

[0092] In this case, due to the striker 181 being located at the forefront side within the cylinder 174, the air chamber 176 within the cylinder 174 is in a state of being open to the outside through the vent hole 174A of the cylinder 174 shown in FIG. 6. Despite the piston 175 being driven, no pressure fluctuation occurs within the air chamber 176, and the striker 181 will not be actuated. Note that FIG. 6 shows, for the sake of convenience, the configuration of the load driving state (to be described later) where, conversely, the air chamber 176 is not open to the outside through the vent hole 174A.

[0093] In this case, as described above, the controller 260 rotates the motor 210 at a predetermined first speed R1. However, since the first speed R1 is set in a relatively low speed range, the driving speed of the vibration damping mechanism 177 is also in a relatively low speed range, and the useless vibration generated in the impact tool 100 via the vibration damping mechanism 177 is minimized. In the present embodiment, regarding this state, an operation mode of driving the motor 210 at the first speed R1, which is relatively low in the no-load driving state, is defined as "soft no-load start". The soft no-load start is an operation mode for rotating the motor 210 at a low speed in a state where the generation of vibration by the vibration damping mechanism 177 is minimized, and improving the response characteristics for subsequent normal impact operations.

[0094] In the present embodiment, although R1 is set to a predetermined value in a relatively low speed range, it is also possible to set R1 to zero. In other words, it is also possible to select a setting in which the motor 210 is not rotationally driven in the no-load driving state. In this case, instead of the rising characteristic from the no-load driving state to the driving state, a setting that emphasizes the energy saving effect and vibration suppression in the no-load driving state is adopted.

[0095] When the impact tool 100 is in the no-load driving state, the following characteristics can be cited. (1) The first elastic body 161 shown in FIG. 7 is placed in a non-compressed state, that is, a state where the biasing force does not act. And a clearance 190CL (2 mm in the present embodiment) is secured between the bifurcated member 192 of the first sliding guide member 190 and the pressing seat 120C. (2) The second elastic body 162 shown in FIG. 7 is placed in a non-compressed state, that is, a state where the biasing force does not act. (3) In the detection mechanism 290 shown in FIG. 19, a clearance 290CL (1 mm in the present embodiment) is secured between the movable member 292 and the duct cover 220.

[0096] (Operation mode 2 of the impact tool 100: Switching from the no-load driving state to the load driving state) Regarding the impact tool 100 in the no-load driving state described above, when an operator presses the handle 130 downward in the first direction D1D, the second housing 120 integrated with the handle 130 approaches the first housing 110 on the downward side in the first direction D1D. Then, the controller case 270, which is a component of the second housing 120, also moves downward in the first direction D1D, and the second elastic body 162 is compressed via the second elastic body mounting portion 278 shown in FIG. 7. The second elastic body 162 placed in the compressed state applies a biasing force to both the first housing 110 and the second housing 120.

[0097] On the other hand, since there is a clearance 190CL (2 mm) shown in FIG. 7 for the first elastic body 161, the bifurcated member 192 on the second housing 120 side does not reach the pressing seat 120C on the first elastic body 161 side, and the first elastic body 161 is placed in a non-compressed state, that is, a state where no biasing force acts. In other words, the clearance 190CL defines the "initial movement distance" for the first elastic body 161 to be placed in a state where no biasing force acts and only the second elastic body 162 acts with a biasing force.

[0098] On the other hand, in the detection mechanism 290 shown in FIG. 19, when the second housing 120 moves downward in the first direction D1D, the entire detection mechanism 290 moves downward in the first direction D1D by the amount of the clearance 290CL (1 mm) between the duct cover 220, and the lower end of the movable member 292 abuts against the duct cover 220. Furthermore, when the second housing 120 moves downward in the first direction D1D, the movable member 292 is pushed by the duct cover 220 (which is about to approach relatively) and moves upward in the first direction D1U against the biasing force of the movable member biasing elastic body 293. When the movable member 292 moves upward in the first direction D1U, the detection of magnetism by the sensor 294 is released. Based on this, the controller 260 detects the pressing of the second housing 120 against the first housing 110 through the detection mechanism 290, and thereby switches from the no-load driving state to the load driving state.

[0099] (Definition of the load driving state of the impact tool 100) In this embodiment, the state in which the motor 210 is driven and the second housing 120 is pressed against the first housing 110 is defined as the "load driving state". This "load driving state" is (1) A state in which a load acts on the tip tool in addition to the self-weight of the striking tool 100, that is, a state in which the tip tool is pressed against the workpiece and is driven while a (non-self-weight) "load" acts. (2) It can also be defined as a state in which both the first elastic body 161 and the second elastic body 162 are compressed, or a state in which at least the second elastic body 162 is compressed and pressing detection is performed by the detection mechanism 290. The load driving state is also referred to as the "load driving state".

[0100] In the load driving state, the controller 260 rotationally drives the motor 210 at a predetermined second speed (second rotational speed) R2 set in a high speed range higher than the first speed R1. The second speed R2 is also defined as the normal driving speed of the striking operation. That is, in this embodiment, based on the detection by the detection mechanism 290, the rotational speed of the motor 210 increases (or is switched from the stationary state to the normal rotational state), and the switching from the no-load driving state to the load driving state is performed. In other words, the detection by the detection mechanism 290 cancels (cancels) the above-described soft no-load, and the configuration is such that the switching to the normal driving pattern is performed. As a specific set value of the second speed R2, for example, it is set by comprehensively judging parameters such as the required output and power consumption in the normal driving operation (load driving state) of the striking tool 100 which is a large hammer. The switching from the first speed R1 to the second speed R2 can be appropriately set from modes such as immediate switching, a mode of sequentially increasing with a certain switching time set, a mode of increasing in a multi-stage manner, or a combination thereof. In this embodiment, a mode of immediately switching from the first speed R1 to the second speed R2 based on the pressing detection is adopted.

[0101] (Operation Modes of the Motion Conversion Mechanism 170 and the Impact Mechanism 180 in the Load Driving State) When the motor 210 is rotationally driven at the second speed R2 in the load driving state, the operation mode of the motion conversion mechanism 170 is substantially equivalent to the case where the motor 210 is rotationally driven at a low speed at the first speed R1 in the no-load driving state, except that the speeds are different. That is, as shown in FIGS. 5 and 6, the rotational output of the output shaft 213 of the motor 210 around the third direction D3 is transmitted to the first intermediate shaft 171 and the second intermediate shaft 172, and is converted into a linear motion in the first direction D1 by the crank mechanism 173. As a result, the piston 175 linearly moves in the first direction D1 within the cylinder 174. Similarly, the vibration damping mechanism 177 mainly composed of the counterweight 178 linearly moves in the first direction D1 on the outer periphery of the cylinder 174.

[0102] When the impact tool 100 is in the load driving state, the ventilation hole 174A is in the state shown in FIG. 6, that is, in a state not facing the air chamber 176, and the air chamber 176 maintains an airtight state between the piston 175 and the striker 181. Therefore, in the load driving state, due to the pressure fluctuation in the air chamber 176 caused by the linear motion of the piston 175 in the cylinder 174, in the impact mechanism 180, the striker 181 linearly moves to drive the impact bolt 182. As a result, the tip tool (not shown) performs an impact operation. This operation mode is defined as the hammer mode.

[0103] In this case, as described above, the controller 260 rotationally drives the motor 210 at a predetermined second speed R2. Since the second speed R2 is set relatively high, it is possible to perform an efficient impact operation. In addition, since the vibration damping mechanism 177 is also driven at a high speed corresponding to the second speed R2 higher than the first speed R1, the vibration damping effect on the relatively large vibration generated on the first housing 110 side in the load driving state is maintained at a high level. In other words, since the vibration can be firmly suppressed according to the impact operation, a good working environment is provided.

[0104] (Function of the anti-vibration handle) In the load driving state, the operator grips the handle 130 and performs a striking operation while pressing it downward in the first direction D1D. However, it is assumed that vibrations occur on the first housing 110 side due to the striking mechanism 180 or the striking operation by the tip tool. In this case, due to the vibration, a relative movement occurs between the first housing 110 and the second housing 120, and the first elastic body 161 shown in FIG. 7 applies a biasing force between the first housing 110 and the second housing 120, thereby suppressing the transmission of the vibration from the first housing 110 side to the second housing 120 side as much as possible. As described above, the second housing 120 integrally houses the handle 130 gripped by the operator, the controller 260 that drives and controls the motor 210, various functional members 280 arranged in the controller case 270, the battery mounting portion 123, and the battery 150 mounted on the battery mounting portion 123. And by suppressing the vibration transmission from the first housing 110 to the second housing 120, the burden on the operator is reduced, and the protection of the controller 260, the functional member 280, and the battery mounting portion 123, which are precision equipment, is thoroughly implemented.

[0105] In this embodiment, the movable stroke of the first elastic body 161 is set to 10 mm (10 millimeters). And if a strong vibration that uses the entire movable stroke is input, the above-described buffer member 205 and stopper 204 act to suppress an adverse effect such that the first housing 110 and the second housing 120 hit the bottom (see FIG. 7).

[0106] When the anti-vibration function is working in the load driving state, to be exact, (1) The first elastic body 161 applies a biasing force, (2) The second elastic body 162 compressed by the operator's pressing also applies a biasing force and acts, (3) The movable member biasing elastic body 293 compressed by the operator's pressing (See FIG. 20 etc.) A biasing force is also applied, Each of these biasing forces (1), (2), and (3) acts between the first housing 110 and the second housing 120. However, as described above, the elastic constant of the second elastic body 162 is set to be relatively small, and further, the elastic constant of the movable member biasing elastic body 293 is set to a minimum value to such an extent that it is sufficient to apply a biasing force for returning the movable member 292 to the initial position (see FIG. 19). Therefore, regarding the vibration isolation function in the present embodiment, the first elastic body 161 capable of exerting a strong elastic force plays a main role.

[0107] For example, when using a single elastic body to combine the pressing detection for switching from the no-load driving state to the load driving state and the vibration isolation function between the first housing 110 and the second housing 120, if the elastic constant is increased, it is effective for vibration isolation, but the required pressing force setting for the operator becomes too high. Conversely, if the elastic constant is decreased, the required pressing force setting for the operator can be optimized, but the vibration isolation effect decreases. In the present embodiment, an "initial movement" elastic body (that is, the second elastic body 162) for soft no-load release and an elastic body (that is, the first elastic body 161) for vibration isolation are provided separately, and are optimized for their respective uses, so such problems do not occur.

[0108] (Actions of the first sliding guide member 190 and the second sliding guide member 200) In the impact tool 100 according to the present embodiment, (1) As shown in FIG. 7, the relative movement between the first housing 110 and the second housing 120 is slidably guided at a plurality of locations in the first direction D1 by using the first sliding guide member 190 and the second sliding guide member 200, thereby ensuring stable operation. (2) As shown in FIG. 7, the first elastic body 161 that plays a main role in the vibration isolation mechanism is disposed between the first sliding guide member 190 and the second sliding guide member 200 in the first direction D1, thereby exerting a stable vibration isolation action. (3) As shown in FIGS. 8 and 9, by arranging a plurality of the first sliding guide members 190 and the second sliding guide members 200 around the first direction D1, more stable operation is ensured. (4) Regarding each component of the first sliding guide member 190 and the second sliding guide member 200, while using a pipe-shaped member 191 made of a metal with excellent rigidity or a sheet metal sliding guide 203, a resin material is used for the member (such as the bifurcated member 192) on the side that pairs with such a high-rigidity member, so as to achieve both strength and weight reduction. (5) By the first sliding guide member 190 and the second sliding guide member 200, not only simple sliding guidance is performed, but also the stopper 204 defines the maximum movable distance of the relative movement. Further, from the state where the relative movement is performed by a predetermined distance less than the maximum movable distance to the maximum movable distance, the buffer member 205 continuously buffers the relative movement operation, thereby constructing a reasonable anti-vibration structure. Note that the stopper 204 and the buffer member 205 can be arranged in any of the following manners: an arrangement mode in which they are arranged on at least one of the first sliding guide 190 and the second sliding guide 200, and an arrangement mode in which they are arranged separately (independently) from the first sliding guide 190 and the second sliding guide 200.

[0109] (Characteristics related to battery mountability, etc.) As described above, in the impact tool 100 according to the present embodiment, as shown in FIGS. 4 to 7, etc., the output shaft 213, which is most likely to have the largest dimension among the motors 210, is arranged to extend in the third direction D3, which is the thickness direction of the impact tool 100. Then, a large-dimension portion of the motor 210 is allocated along the third direction D3. Instead, a space formed for arranging other functional members along the second direction D2, which is the width direction of the impact tool 100, is largely secured as an extended space S. That is, as shown in FIGS. 1 and 4, a relatively large space for other functional members is secured in the lateral region 114 of the first housing 110 in the second direction D2. In this embodiment, as a result, it becomes possible to bring the relatively heavy battery 150 as close as possible to the center of gravity of the impact tool 100 (which is located on the central axis along the first direction D1) with respect to the second direction D2, and it is possible to greatly suppress the generation of unnecessary couple forces in the impact tool 100.

[0110] Also, since the battery mounting direction 156 is set to be along the third direction D3 (see FIG. 3), when the battery 150 is mounted on the battery mounting portion 123, the expansion space S can be utilized, and the mounting work can be performed in a large space, so the workability is improved. Further, by setting the battery mounting direction 156 to be along the third direction D3, it is possible to intersect the first direction D1, in which vibration is likely to occur during the impact operation, with the battery mounting direction 156, and it is possible to prevent problems such as an unexpected external force acting on the battery 150 due to vibration and the battery accidentally detaching.

[0111] Furthermore, as shown in FIG. 1 and the like, by setting the pair of battery mounting portions 123 in the area 130A directly below the handle 130, the operator can hold the handle 130 with one hand and use the other hand to mount the battery 150 on the opposite side. Next, by switching the hand holding the handle 130 and holding the handle 130 with the other hand, the battery 150 on the opposite side is mounted. In this way, the cooperation between holding the handle 130 and mounting the battery 150 is improved.

[0112] (Characteristics regarding detection certainty etc. in the detection mechanism 290) In this embodiment, as shown in FIGS. 10 to 13, FIGS. 18 to 20, etc., for the detection mechanism 290, as an assembly, a configuration is adopted in which it is integrally mounted on the controller case 270, which is a component on the second housing 120 side, via the detection mechanism mounting portion 274. The detection mechanism 290 is a member for detecting the relative movement operation between the first housing 110 and the second housing 120. Therefore, generally, its components are usually distributed and provided on both the first housing 110 and the second housing 120. However, in this embodiment, it is distributed on the second housing 120 side, and the duct cover 220, which is an existing component of the first housing 110, is made to have the function as the operating medium of the movable member 292.

[0113] Therefore, since each member of the detection mechanism 290 can be integrally arranged on the first housing 110 side as an assembly body, it is possible to suppress the operation failure caused by the assembly error of each member and the risk of detection uncertainty. Also, as shown in FIGS. 19 and 20, by forming a clearance 290CL between the duct cover 220, which is the operating medium of the movable member 292, it is possible to absorb the assembly error between the first housing 110 and the second housing 120 and suppress the risk of operation failure and detection uncertainty.

[0114] Also, as described above, the detection mechanism 290 constitutes a mechanism for releasing the soft no-load and switching to the load driving state. However, during the striking operation, due to accidental events such as changes in the operator's gripping posture or changes in the orientation of the striking tool 100 (tilt angle with respect to the first direction D1), the pressing force may temporarily decrease. In such a case, it is rather inconvenient to switch from the load driving state to the soft no-load each time due to the decrease in the pressing force. Therefore, in this embodiment, even when the pressing force decreases in the load driving state, it is set not to switch to the soft no-load until a certain time has elapsed (for example, 1 second), and the load driving state is maintained. Thereby, the convenience during the striking operation is further improved.

[0115] Furthermore, for example, a mode in which pressing is detected based on a change in the load current of a motor or the like, and the soft no-load is released to switch to the load driving state is generally considered. However, especially in the case of a large-sized hammer characterized by a large output, for example, depending on the material and type of the work piece to be struck, the load current may vary, and there is a concern that the pressing may not be accurately detected. In the present embodiment, since a configuration for performing pressing detection using a mechanical detection mechanism of a movable member 292 biased by a movable member biasing elastic body 293 is adopted, the certainty of detection is ensured.

[0116] (Characteristics of the controller case 270) In the striking tool 100 according to the present embodiment, as shown in FIGS. 7, 10, 11, etc., a controller 260 for motor drive control is held in a controller case 270. Regarding the controller case 270 according to the present embodiment, for example, the following characteristics can be cited. (1) As a configuration for holding not only the controller 260 but also various functional members 280 together, the device configuration and assembly are rationalized and facilitated, contributing to the compactification of the overall configuration. (2) It is mainly composed of a frame 271 and has a lightweight and high-rigidity structure. (3) By being arranged in the second housing 120 on the vibration isolation side, it has a vibration isolation structure against the vibration generated in the first housing 110. (4) By being arranged in the region directly above the motor 210, it is easy to route the wire harness (wiring) with respect to the motor 210. (5) By being arranged on the center line in the first direction D1 of the striking tool 100, the wire harness (wiring) can be symmetrically arranged in both the second direction (width direction) D2 and the third direction (thickness direction) D3, facilitating design and assembly. (6) As described above, in this embodiment, a brushless motor that is easy to miniaturize while maintaining a large output is adopted as the motor 210, and its output shaft 213 extends along the third direction D3, forming an extended space S in the lateral region 114. By arranging the controller case 270 directly above the motor 210, the extended space S can be easily utilized for arranging wire harnesses and the like, enabling highly efficient utilization of the internal space.

[0117] (Features regarding the cooling performance of the motor, controller, etc.) In the impact tool 100 according to this embodiment, as described above, as the cooling air supply route to the components to be cooled, through the axial flow action of the cooling fan 214 of the motor 210, "intake from the cooling air intake port 127" - "flow through the inside of the head case 121" - "cool the controller 260" - "the first end 232 of the duct hose 231" - "inside the duct hose 231" - "the second end 233 of the duct hose 231" - "the duct cover 220" - "inside the motor housing 215", and the controller 260 and the motor 210 are cooled in this order. Furthermore, the cooling air that has cooled the motor 210 passes through the "upper drive mechanism housing portion 111" - "lower drive mechanism housing portion 112" in the first housing 110, cools the motion conversion mechanism 170 and a part of the impact mechanism 180, and then is discharged to the outside of the impact tool 100. For the cooling air passage and the like on the downstream side of the motor 210, detailed illustrations are omitted for the sake of convenience.

[0118] Furthermore, in the impact tool 100 according to this embodiment, the following points can be cited as features regarding the cooling performance of the components. (1) For the duct hose 231, when it is extended from a predetermined initial state, a member to which a biasing force acts toward the contraction side is used so as to return to the initial state, and it is arranged in a connected manner between the first housing 110 and the second housing 120 in a state where it is extended by a predetermined amount from the initial state. Thereby, the duct hose 231 is placed in a state where a biasing force always acts toward the contraction side so as to return to the initial state. Therefore, even when the first housing 110 and the second housing 120 move relative to each other, the duct hose 231 does not slack and come into contact with other members to cause wear, and excessive tension, twisting, etc. are less likely to occur, and the cooling air can be effectively transferred between the members that move relative to each other.

[0119] (2) As shown in FIGS. 11, 16, and 17, the cross-sections of the first end portion 232 and the second end portion 233 are in a crossed state with each other. Thereby, similarly to the above (1), when the first housing 110 and the second housing 120 move relative to each other, it becomes easier to avoid twisting of the duct hose 231 and unnecessary tension addition.

[0120] (3) As shown in FIG. 16, the first end portion 232 and the second end portion 233 of the duct hose 231 are directly and fittingly attached to the duct member attachment portion 272 of the controller case 270 and the duct member attachment portion 225 of the duct cover, respectively. That is, by adopting a structure without an adapter, the device configuration can be simplified.

[0121] (4) As shown in FIG. 16, since the first end portion 232 of the duct hose 231 is located in the upper region in the vicinity of the cooling fan 214 of the motor 210, it becomes easier to avoid the problem that the duct hose 231 is made unnecessarily long and that unnecessary tension is applied due to being too short.

[0122] (5) As shown in Fig. 16, at least a cooling air intake port 127A is provided corresponding to the end on the side opposite to the duct member mounting portion 272 of the controller case 270. Further, in the present embodiment, cooling air intake ports 127 are provided over the entire upper surface of the head case 121. Thereby, since the cooling air inhaled into the impact tool 100 can cool the controller 260 over the whole, the cooling efficiency can be improved.

[0123] (6) As shown in Fig. 11, the duct hose 231 is placed in a state where the curved shape of generally the central portion is held by the duct portion guide rib 116 of the motor housing 215. Thereby, even when the first housing 110 and the second housing 120 move relative to each other, the mounting shape (generally an L-shaped) of the duct hose 231 is maintained, and it becomes easy to avoid the twisting and unnecessary tension addition of the duct hose 231.

[0124] (Modification example of the handle 130) In the impact tool 100 according to the present embodiment, as shown in Fig. 3 and the like, the rod-shaped first handle portion 131 and the second handle portion 141 each having free end regions 134 and 144 were used, but this can be changed to other configurations. As shown in Figs. 21 and 22, the impact tool 300 according to the modification example has a first housing 310 and a vibration-proof second housing 320 connected to the first housing 310 so as to be relatively movable in the first direction D1. Further, the second housing 320 is provided with a handle 330 extending in the second direction D2, and a first handle portion 331 and a second handle portion 341.

[0125] The first handle portion 331 and the second handle portion 341 each have a handle grip portion 333, 343 for the operator to grip, and handle base portions 332, 342 connecting both ends of the handle grip portions 333, 343 to the second housing 320, respectively. When viewed in the first direction D1, the first handle portion 331 and the second handle portion 341 are each formed in a loop (annular) shape and have closed space portions 334 and 344 with respect to the second direction D2 and the third direction D3 between them and the second housing 320. On both side surfaces of the second housing 320, battery mounting portions 323 are respectively provided at height positions facing the space portions 334 and 344 with respect to the first direction D1.

[0126] In FIGS. 21 and 22, states in which batteries 350 are respectively mounted on the battery mounting portions 323 are shown. In this state, each battery 350 is arranged so as to be surrounded by the space portions 334 and 344 with respect to the plane formed by the second direction D2 and the third direction D3. That is, the first handle portion 331 and the second handle portion 341 are each a member for an operator to grip and are configured to serve as a battery protector that protects the battery 350 from external forces. Note that an LED light 329 is also provided in the impact tool 300 according to this modification example, and it is configured to contribute to facilitating visual recognition during impact work.

[0127] Also, as shown in FIG. 21, in this modification example as well, the output shaft 361 of the motor 360 is arranged to extend along the third direction D3. Therefore, by directing the large-sized output shaft 361 in the third direction D3, a relatively large expansion space S can be formed on the second direction D2 side. In this modification example as well, since the battery 350 can be mounted on the battery mounting portion 323 using this expansion space S, the rationality of the arrangement is improved.

[0128] As described above, according to the present embodiment and its modification example, in the impact tool 100 that normally performs an impact work mode in a state of facing downward due to its own weight, a construction technique that contributes to rationalizing the arrangement configuration and operability of members is provided.

Description of Reference Numerals

[0129] 100: Striking tool 110: First housing (main body part) 111: Upper side drive mechanism housing part 112: Lower side drive mechanism housing part 113: Tip region 114: Side region 115: Motor housing 116: Duct part guide rib 120: Second housing (main body part) 120A: First elastic body mounting seat 120B: Second elastic body mounting seat 120C: Pressing seat 121: Head case 122: Handle mounting part 123: Battery mounting part 124: Slide guide 125: Power supply terminal 126: Buffer member contact seat 127: Cooling air intake port 128: Battery protector 129; LED light 130: Handle 131: First handle part (handle R) 132: First handle base 133: First handle gripping part 134: Free end region 135: Trigger 136: Electric switch 141; Second handle (handle L) 142: Second handle base 143: Second handle gripping part 144: Free end region 130A: Region directly below the handle 330: Handle (relating to modified example) 310: First housing 320: Second housing 323: Battery mounting part 329: LED light 331: First handle part 332: Handle base 333: Handle grip part 334: (Closed) space part 341; Second handle part 342: Handle base part 343: Handle grip part 344: (Closed) space part 350: Battery 360: Motor 361: Output shaft 150: Battery 151: Battery front part 152: Battery upper part 153: Battery bottom part 154: Battery rear part 155: Lock release part 156: Battery mounting direction 161: First elastic body 162: Second elastic body 170: Motion conversion mechanism 171: First intermediate shaft 172: Second intermediate shaft 173: Crank mechanism 174: Cylinder 174A: Vent hole 175: Piston 176: Air chamber 177: Vibration damping mechanism 178: Counterweight 180: Striking mechanism 181: Striker 182: Impact bolt 190: First sliding guide member (handle proximity side sliding guide member) 191: Pipe-shaped member (First housing side component) 192: Forked member (Second housing side component) 190CL: Clearance 200: Second sliding guide member (handle separation side sliding guide member) 201: Convex member 202: Concave member 203: Sheet metal sliding guide 204: Stopper 205: Buffer member 210: Motor 211: Stator 212: Rotor 213: Output shaft 214: Cooling fan 215: Motor housing 220: Duct cover 221: Internal space 222: Motor mounting seat 223: Flange 224: Cooling air induction path 225: Duct member mounting part 230: Duct member 231: Duct hose 232: First end 233: Second end 240: Tool holder 250: Retainer 260: Controller 261: Heat dissipation fins 270: Controller case 271: Frame 272: Duct member mounting part 273: Head case mounting part 274: Detection mechanism mounting part 275: Main power switch mounting part 276: Communication unit mounting part 277: Wire harness insertion opening 278: Second elastic body mounting part 280 : Functional member 281: Main power switch 282: Communication unit 290: Detection mechanism 291: Assembly body base 292: Movable member 293: Movable member biasing elastic body 294: Sensor 290CL: Clearance D1: First direction (major axis direction) D1D: Downward in the first direction D1U: Upward in the first direction D2: Second direction (width direction) D3: Third direction (thickness direction) AX: Major axis HL: Virtual line MS: Initial movement distance S: Expansion space

Claims

1. A long main body having a tool holder at its tip region, and when defining the longitudinal axis direction of the main body as a first direction and the width direction intersecting the first direction as a second direction, a pair of handles extending in the second direction, and an operator holds the pair of handles with the left and right hands respectively, and in a state of being suspended by its own weight, a striking tool for performing a striking operation through a tip tool removably attached to the tool holder, a drive mechanism for driving the tip tool in the first direction; a motor provided with a motor output shaft for driving the drive mechanism; the motor output shaft is provided so as to extend in a third direction defined as a thickness direction intersecting both the first direction and the second direction, and a battery mounting portion is provided in a side region of the main body in the second direction, the battery mounting portion has a slide guide for engaging with a battery that supplies power to the motor; the slide guide is provided at a portion protruding in the second direction from a portion of the main body where the drive mechanism is housed; When defining the direction from the handle to the tool holder as downward and the direction from the tool holder to the handle as upward in the first direction, the battery engages with the slide guide below the slide guide, The battery mounting portion is provided in a region directly below the lower side of the handle in the first direction. A striking tool characterized by this.

2. The striking tool according to claim 1, wherein the battery mounting portions are arranged in a pair on both side surfaces of the main body in the second direction.

3. The striking tool according to claim 1 or 2, wherein in a state where a battery is mounted on the battery mounting portion, the outer contour of the battery is configured to be arranged within an imaginary line connecting the free end region of the handle and the tip region of the main body.

4. The impact tool according to any one of claims 1 to 3, wherein the handle has a grip portion that extends linearly and is provided for an operator to grip.

5. The impact tool according to any one of claims 1 to 4, wherein the battery mounting portion is configured to slidably mount a battery in a direction intersecting the first direction.

6. The impact tool according to any one of claims 1 to 5, wherein the drive mechanism has a motion conversion mechanism that converts the rotational motion of the motor output shaft into a linear motion in the first direction, and the battery mounting portion is provided in an overlapping manner with the motion conversion mechanism with respect to the first direction.

7. The impact tool according to claim 6, wherein the motion conversion mechanism is disposed on a side of the main body portion that is separated from the operator with respect to the third direction.

8. The impact tool according to any one of claims 1 to 7, wherein the main body portion has a battery protector for protecting the outer shell of the battery mounted on the battery mounting portion.

Images