Impact tools

Abstract

To provide a construction technology for a striking tool that is able to securely protect a device even if an accidental drop or the like occurs.SOLUTION: A striking tool 101 has: a rotary support shaft 130 connecting a body portion 102 and a handle 120 so that they are rotatable relatively; and a first elastic member that buffers vibration transmission from the body portion 102 to the handle 120 when the body portion 102 and the handle 120 rotate relatively. The handle 120 has a battery attaching portion for attaching a motor-driving battery thereto and is configured to be movable relatively with respect to the body portion 102 with the rotary support shaft 130 interposed therebetween. The handle also has a handle relative movement amount adjustment unit 133 for regulating an amount of relative movement of the handle 120 with respect to the body portion 102 in a predetermined direction so as to be larger than an amount of relative movement of the handle with respect to the body portion in each of directions other than the predetermined direction.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present disclosure relates to an impact tool having excellent equipment protection against external forces. [Background technology]

[0002] An example of an impact tool is disclosed in JP 2014-231126 A. This impact tool has a main body in which a motor, a motion conversion mechanism, and an impact mechanism are disposed, a handle connected to the main body via a rotation shaft at the rear of the main body so as to be rotatable relative to the main body, and a shock-absorbing coil spring disposed between the main body and the handle to reduce transmission of vibration from the main body to the handle during the relative rotation. In other words, the impact tool has a vibration-proof handle structure. In addition, a removable battery for driving the motor is located under the handle.

[0003] The impact tool is a portable tool that is used for impact work while being held by an operator by the handle, but there is a possibility that the tool may be dropped unexpectedly. In this case, due to the relatively heavy battery, the exposed end (exposed rear end) of the battery may face the direction of fall during the fall, and an impact force from the ground or the like may directly act on the battery. Impact force carries the risk of damaging the battery itself or the battery mounting portion provided on the main body for mounting the battery, so it is necessary to avoid impacts on the battery as much as possible. On the other hand, it is not realistic to always fix a portable impact tool in place to prevent it from falling, and even if a fall does occur, measures are needed to maximize the protection of the battery or the impact tool. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2014-231126 A Summary of the Invention [Problem to be solved by the invention]

[0005] In view of the above, an object of the present invention is to provide a technique for constructing an impact tool that can reliably protect equipment even when it is accidentally dropped or the like. [Means for solving the problem]

[0006] In order to solve the above problem, according to one aspect of the present disclosure, A main body having a motor and a mechanism that is driven by the motor to cause the tool tip to perform an impact action; A handle for an operator to grasp; An impact tool is configured having a rotating support shaft that connects the main body and the handle so that they can rotate relative to each other, and a first elastic member that is interposed between the main body and the handle and that buffers the transmission of vibration from the main body to the handle when the main body and the handle rotate relative to each other around the rotating support shaft. The handle has a battery mounting portion on which a battery for driving the motor is mounted, and is configured to be movable relative to the main body portion across the rotation shaft. The handle further includes a relative movement amount adjustment portion that regulates the amount of relative movement of the handle with respect to the main body in a predetermined direction so that the amount of relative movement in a direction other than the predetermined direction is greater.

[0007] In this impact tool, when the main body and the handle rotate relative to each other, the elastic member prevents vibrations from being transmitted from the main body to the handle (hereinafter referred to as "vibration damping action"). Furthermore, if an unintended external force acts on the impact tool (typically when an operator accidentally drops the impact tool), the handle moves relative to the main body, sandwiching the rotating shaft, thereby mitigating damage to the impact tool caused by the external force. Furthermore, the impact tool is provided with a handle relative movement adjustment unit that regulates the amount of relative movement of the handle with respect to the body in a predetermined direction so that it is greater than the amount of relative movement in other directions. This makes it possible to selectively mitigate damage, for example, by making the amount of relative movement of the handle with respect to the body greater in a direction that is particularly likely to cause damage to the impact tool than in other directions.

[0008] The impact tool is sufficient if the tool bit performs at least a striking action, and preferably also includes a configuration in which the tool bit performs a rotating action. The motor and the mechanism may be housed in an integrated main body, or may be housed in a motor housing and a gear housing that are formed separately. The rotation support shaft may be integral with the handle, integral with the main body, or formed separately from the handle and main body and then assembled to the handle or main body. The relative movement of the handle with respect to the main body with the rotating shaft sandwiched between them is typically a linear movement, but may also be a curved or arc-shaped movement. The relative movement "with the rotating shaft sandwiched between them" is typically configured to form a space around the rotating shaft, and the handle moves relative to the main body through the space. Typically, the "predetermined direction" preferably roughly corresponds to the input direction of an external force when an unintended external force acts on the impact tool.

[0009] According to the object of the present invention, a technique for constructing an impact tool capable of reliably protecting equipment even in the event of an unexpected drop or the like is provided. [Brief description of the drawings]

[0010] [Figure 1] 1 is a front view (partly in cross section) showing an overall configuration of an impact tool according to an embodiment of the present invention. [Diagram 2] FIG. 2 is an enlarged view of a main part of the impact tool shown in FIG. [Diagram 3] FIG. 3 is a partial cross-sectional view taken along line II in FIG. [Figure 4]FIG. 4 is a perspective view showing the configuration of a lower part of the handle and a front region of the battery. [Diagram 5] 1 is a partial perspective view showing a state in which an external force acts on the impact tool according to the embodiment when the impact tool is dropped; [Figure 6] 1 is a front view (partly in cross section) showing a state in which a dust collection attachment is attached to an impact tool according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Regarding the above-mentioned configuration, a second elastic member may be interposed between the main body portion and the handle portion around the rotation support shaft. This further effectively reduces damage to the impact tool caused by external forces. The handle relative movement amount adjuster may be disposed in an area spaced apart from the rotation support shaft. The handle relative movement amount adjustment portion may have an elongated hole and a protrusion that fits into the elongated hole, and may be configured so that a major axis direction of the elongated hole coincides with the predetermined direction. The impact tool may further include a battery attached to the battery attachment portion, and the specified direction may be an impact input direction defined as the direction in which, when the impact tool is dropped, the impact caused by the drop is directed toward the main body portion via the battery. Typically, it is defined as the direction from the rear end of the battery toward the main body. The impact input direction may be a direction from the battery toward a center of gravity of the main body. Typically, it is defined as a line connecting the rear end of the battery to the center of gravity of the impact tool with the battery attached. The vehicle may further include a work assist device attached integrally to the main body, and the impact input direction may be a direction from the battery toward a center of gravity of the main body and the work assist device which are integrated together. Typically, it is defined as a line connecting the rear end of the battery to the center of gravity of the impact tool with the battery and the work auxiliary equipment attached. The main body may further include a third elastic member interposed between the main body and the battery. The third elastic member may be normally out of contact with the battery. In other words, a predetermined distance is normally set between the third elastic member and the battery, and when an impact force acts on the battery, the third elastic member and the battery are brought into contact with each other, and the impact force is buffered by the third elastic member. The rotation support shaft may be disposed on the main body portion on a front side of the battery. The first elastic member may be a coil spring.

[0012] Hereinafter, a hitter 101 according to an embodiment will be described with reference to FIGS. The impact tool 101 is one example of the "impact tool" according to the present invention. FIG. 1 shows the overall configuration of an impact tool 101 in a front view. In this embodiment, for convenience of explanation, the long axis direction of the impact tool 101 (also referred to as the long dimension direction: the left-right direction on the paper in FIG. 1) is defined as a first direction D1. Further, the up-down direction (also referred to as the vertical direction: the up-down direction on the paper in FIG. 1) intersecting with the long axis direction is defined as a second direction D2. Unless otherwise specified, the direction perpendicular to the first direction and the second direction is defined as the width direction or the left-right direction. Further, although details will be described later, when the impact tool 101 falls, the direction in which the external force acting on the impact tool 101 from the falling surface is defined as D3.

[0013] (Overall composition) As shown in FIG. 1, the impact tool 101 generally includes a housing 102, a handle 120, and a sub-handle 121 in external appearance. The housing 102 is an example of a "main body". The housing 102 has a first housing region 102A forming a central portion, a second housing region 102B forming an upper portion, and a battery front region 102C forming a lower portion.

[0014] (Internal Structure of Housing 102) In the first housing region 102A, a motor 110 is arranged. The motor 110 has an output shaft 110A and a cooling fan 110B. The motor 110 is arranged such that the output shaft 110A extends in the second direction D2. In this embodiment, a brushless motor is adopted as the motor 110. Since the brushless motor can secure a large output with a relatively small size, it is preferably used for the impact tool 101.

[0015] In the second housing region 102B, a motion conversion mechanism 111 and an impact mechanism 112 are arranged. The motion conversion mechanism 111 has a first intermediate shaft 111A, a second intermediate shaft 111B, a crank mechanism 111C, a cylinder 111D, and a piston 111E. The impact mechanism 112 has a striker 112A and an impact bolt 112B.

[0016] The first intermediate shaft 111A is connected to the output shaft 110A of the motor 110 and is rotationally driven. The first intermediate shaft 111A rotates the crank mechanism 111C around the second direction D2. When the crank mechanism 111C rotates around the second direction D2, the piston 111E, which is linked to the crank mechanism 111C, reciprocates linearly in the first direction D1 within the cylinder 111D.

[0017] A striker 112A is arranged within the cylinder 111D. The striker 112A is moved in the first direction D1 via pressure fluctuations in the air chamber 111F accompanying the reciprocating motion of the piston 111E. When the striker 112A moves, the kinetic energy of the striker 112A is transmitted to the impact bolt 112B. As a result, the impact bolt 112B moves within the tool holder 103 in the first direction D1, and (not shown for convenience) the tip tool is moved linearly. As a result, the tip tool performs a striking operation. Note that a chuck portion 104 for attaching the tip tool to the tool holder 103 is provided in the tip region of the second housing region 102B.

[0018] The second intermediate shaft 111B is connected to the output shaft 110A of the motor 110 in parallel with the first intermediate shaft 111A and is driven to rotate. The second intermediate shaft 111B rotates the tool holder 103 in a first direction D1 via a bevel gear 113. When the tool holder 103 rotates in the first direction D1, a tool tip (not shown for convenience) is rotated in the first direction D1. This performs a rotation operation. The worker can select either the impact operation or the rotation operation, or can drive both simultaneously.

[0019] (Configuration of handle 120) The handle 120 generally includes a gripping region 120A, an upper housing connection region 120B, and a lower housing connection region 120C. The gripping area 120A extends generally perpendicular to the first direction D1 (slightly intersecting with the second direction D2) and is used for gripping by an operator. The gripping area 120A has an actuating trigger 123 and an electric switch 124 connected to the trigger 123 in its upper area.

[0020] Upper housing connection region 120B is integrally connected to grip region 120A, extends generally in first direction D1, and is connected to housing 102 with coil spring 150 interposed therebetween. Interposition of coil spring 150 allows upper housing connection region 120B to move relative to housing 102 in first direction D1. Coil spring 150 is an example configuration corresponding to a "first elastic member."

[0021] The lower housing connection region 120C is integrally connected to the grip region 120A, extends generally in the first direction D1, and is connected to the housing 102 with a rotation support shaft 130 interposed therebetween. The rotation support shaft 130 is disposed between the lower housing connection region 120C and the housing 102, allowing the lower housing connection region 120C to rotate about the rotation support shaft 130 relative to the housing 102. The rotation support shaft 130 is an example configuration corresponding to a "rotation support shaft." A controller 125 for controlling the driving of the motor 110 is disposed within the lower housing connection region 120C. A battery mounting portion 127 is provided on the lower surface side of the lower housing connection region 120C.

[0022] (Configuration of sub-handle 121) The sub-handle 121 is also referred to as an auxiliary handle, and is detachably attached to the tip region of the second housing region 102B. When the sub-handle 121 is attached to the impact tool 101, for example, when an operator holds the handle 120 with his / her right hand, the sub-handle 121 is held by the left hand to assist in the work.

[0023] (Configuration of battery 105) The battery 105 is slid in the first direction D1 to be attached to the battery attachment portion 127. The battery 105 supplies a driving current to the motor 110 disposed in the housing . When the battery 105 is mounted in the battery mounting section 127, the battery 105: (1) A battery lower surface portion 105A that is substantially flush with the bottom surface of the housing 102; (2) A battery rear surface portion 105B that defines the rear surface of the impact tool 101 when the battery 105 is attached; (3) A battery rear end portion 105C that is defined as a boundary area between the battery lower surface portion 105A and the battery rear surface portion 105B and that defines a rear end portion on the lower side of the impact tool 101 when the battery 105 is attached; (4) a battery front portion 105D facing a battery front region 102C formed below the second housing region 102B of the housing 102; Each of them has: Furthermore, in the battery front region 102C of the housing 102, a second shock absorbing rubber 140 is disposed facing the battery front surface 105D with a minute separation space 141 therebetween when the battery 105 is attached to the battery attachment portion 127. The second shock absorbing rubber 140 is an example configuration corresponding to the "third elastic member."

[0024] (Configuration of Rotational Support Shaft 130 and Its Surrounding Area) Next, the peripheral configuration of the rotation support shaft 130 will be described in detail with reference to FIGS. As shown in FIG. 2, a lower housing connection region 120C of the handle 120 is connected to a battery front region 102C of the housing 102 via a rotation support shaft 130 so as to be relatively rotatable. In addition, in a region (in this embodiment, a lower region in the direction intersecting the first direction D1 and the second direction D2) spaced a predetermined distance from the rotation support shaft 130, a protrusion 133B formed on the housing 102 side is arranged in a loosely fitted state with respect to a long hole 133A formed on the handle 120 side. The long hole 133A and the protrusion 133B constitute the handle relative movement amount adjustment portion 133. The long hole 133A has a long axis extending in an external force acting direction D3 described later. The protrusion 133B is fitted into the long hole 133A with a slight clearance CL (play) with respect to the inner wall of the long hole 133A. As a result, the protrusion 133B is configured to be able to move relatively large in the long axis direction, i.e., in the external force acting direction D3, and relatively small in directions other than the long axis, i.e., in directions other than the external force acting direction D3. The handle relative movement amount adjuster 133 is an example configuration corresponding to a "handle relative movement amount adjuster".

[0025] A cross-sectional view taken along line II in FIG. 2 is shown in FIG. 3, the rotating support shaft 130 has a pair of rotating support shaft protrusions 130A in the left-right direction. In order to form the handle 120, the rotating support shaft 130 is formed by combining a first divided body 120D and a second divided body 120E, each of which is formed in half, and fixing them with a fixing screw 130B. In other words, the rotating support shaft 130 is formed integrally with the handle 120 by the components of the handle 120.

[0026] The rotation support shaft 130 is rotatably held by a rotation support bearing portion 131 formed in a recessed shape in the housing 102. Specifically, the rotation support bearing portion 131 is formed as a pair in the left-right direction as a recessed space portion by combining a first divided body 102D and a second divided body 102E each formed in a half shape in order to form the housing 102. The rotation support shaft protrusion portion 130A is fitted to the rotation support bearing portion 131 in a state separated by a clearance 131A. Furthermore, a first buffer rubber 132 is interposed between the rotation support protrusion portion 130 and the rotation support bearing portion 131 so as to fill the clearance 131A. The first buffer rubber 132 is configured as an O-ring rubber, and receives the rotation support shaft 130 in the rotation support bearing portion 131 in an interposed manner over the entire radial direction.

[0027] With the above configuration, the housing 102 and the handle 120 are capable of relative rotation around the rotation support shaft 130, and are also capable of relative movement via the clearance 131A, sandwiching the rotation support shaft 130. When the housing 102 and the handle 120 move relatively with the rotation support shaft 130 sandwiched therebetween, the first cushioning rubber 132 is compressed according to the distance of the relative movement, thereby cushioning the impact between the housing 102 and the handle 120. The first cushioning rubber 132 is an example configuration that corresponds to the "second elastic member."

[0028] As already explained with reference to FIG. 2, the handle relative movement adjustment portion 133 is formed by loosely fitting a protrusion 133B formed on the housing 102 side into a long hole 133A formed on the handle 120 side in an area spaced a predetermined distance from the rotating support shaft 130. As shown in detail in FIG. 3, in order to form the handle 120, the long holes 133A are formed as a pair in the left-right direction and integrally with the handle 120 by combining a first half 120D and a second half 120E, each of which is formed in half. Similarly, the convex portions 133B are formed as a pair in the left-right direction as a concave space portion and integrally with the battery front region 102C of the housing 102 by combining a first divided body 102D and a second divided body 102E, each of which is formed in half, to form the housing 102.

[0029] (Configuration of the battery front region 102C in the housing 102) The configuration of the peripheral area of ​​the battery front area 102C in the housing 102 is shown in FIG. In the front region 102C of the housing 102, the above-mentioned second shock absorbing rubbers 140 are arranged in a pair on the left and right. Further, a battery mounting section 127 is disposed below the lower housing connection area 120C of the handle 120. The battery mounting section 127 has a slide guide for mounting the battery and a power supply terminal.

[0030] (Operation of the impact tool 101) Next, the operation of the impact tool 101 according to this embodiment will be described. 1 (or while gripping the handle 120 and the sub-handle 121). Upon receiving a trigger ON signal from an electric switch 124 linked to the trigger 123, the controller 125 controls the drive of the motor 110. In this embodiment, a brushless motor is used, and the controller 125 drives the motor 110 by so-called PWM control.

[0031] The rotation output of the motor 110 is converted into linear motion of a piston 111E in a cylinder 111D in a first direction D1 via an output shaft 110A, a first intermediate shaft 111A, and a crank mechanism 111C. The linear motion of the piston 111E causes the striker 112A to move in the first direction D1 via pressure fluctuations in an air chamber 111F in the cylinder 111D. When the striker 112A moves, the kinetic energy of the striker 112A is transmitted to the impact bolt 112B, which moves in the first direction D1 within the tool holder 103, and moves the tool tip (not shown for convenience) in a straight line. This causes the tool tip to perform a striking operation. This operation mode is defined as a hammer mode.

[0032] In addition, in the impact tool 101 according to this embodiment, a work mode in which the second intermediate shaft 111B shown in FIG. 1 is coupled to the output shaft 110A of the motor 110 and driven to rotate can also be selected. This work mode is defined as a drill mode. In this case, the second intermediate shaft 111B rotates the tool holder 103 in a first direction D1 via the bevel gear 113. By rotating the tool holder 103 in the first direction D1, a tool tip (not shown for convenience) is rotated in the first direction D1 to perform a rotating operation. In this embodiment, the operator can arbitrarily select from among a working mode of only the hammer mode, a working mode of only the drill mode, and a working mode of a hammer drill mode which is a combination of the hammer mode and the drill mode.

[0033] (Anti-vibration handle action) When the impact tool 101 is used to perform work on a workpiece, relatively strong vibrations are likely to occur in the housing 102 in which the motion conversion mechanism 111 and the impact mechanism 112 are disposed. The vibration-proof handle mechanism functions to suppress the transmission of this vibration from the housing 102 to the handle 120. That is, the housing 102 and the handle 120 are allowed to rotate relatively around the rotation support shaft 130, and the coil spring 150 is compressed by this relative rotation, thereby suppressing the transmission of vibration from the housing 102 to the handle 120.

[0034] (Protection mode when the impact tool 101 falls [1]) The impact tool 101 according to this embodiment is a portable tool. Unlike a stationary tool, an operator may hold the impact tool 101 and move it to a work location, or may place the impact tool 101 at a high place. In this state, if the impact tool 101 shown in FIG. 1 is dropped unexpectedly, it is assumed that the rear end portion 105C of the battery faces downward, and a line connecting the rear end portion 105C of the battery and the center of gravity G1 of the impact tool 101 with the battery 105 attached thereto is vertical. This state is shown in FIG. 5. This is because the battery 105 attached to the impact tool 101 is a heavy object.

[0035] In such a case, the impact force generated when the dropped impact tool 101 hits the ground or the like may act on the rear end portion 105C of the battery. In other words, the line connecting the rear end portion 105C of the battery and the center of gravity G1 defines the vertical direction when the impact tool 101 is dropped, and also defines the direction in which the impact force acts when the impact tool 101 is dropped. In this specification, this direction is defined as an external force acting direction D3. Such an impact force may damage the battery 105, the battery mounting portion 127, etc., and should be avoided as much as possible.

[0036] 2 and 3, in this embodiment, the housing 102 and the handle 120 are capable of relative rotation around the rotation support shaft 130, and are also capable of relative movement across the rotation support shaft 130 via a clearance 131A. When the housing 102 and the handle 120 move relative to each other across the rotation support shaft 130, the first cushioning rubber 132 is compressed in the direction of the relative movement according to the distance of the relative movement. This provides a configuration that cushions impacts between the housing 102 and the handle 120. Specifically, as shown in FIG. 5, when the impact tool 101 with the battery 105 attached is dropped with the external force acting direction D3 being the vertical direction, an impact force F from the contact surface is input to the rear end portion 105C of the battery in the external force acting direction D3.

[0037] In this case, as shown in Fig. 2, the handle relative movement amount adjustment part 133 is formed so that the long axis of the long hole 133A faces the external force acting direction D3. Therefore, the convex part 133B arranged in a loose fit state in the long hole 133A is configured to be able to move a relatively long distance (long axis length L1 shown in Fig. 2) within the long hole 133A. Therefore, when an impact force F at the time of a fall is input in the external force acting direction D3, the convex part 133B moves a relatively long distance in the long axis direction of the long hole 133A and compresses the first buffer rubber 132. As a result, the first buffer rubber 132 is compressed relatively large in the external force acting direction D3, and the impact force F can be effectively buffered. In this embodiment, the buffering action of the first buffer rubber 132 is completed before the convex portion 133B moves completely through the long axis length L1 of the long hole 133A, and a configuration is adopted that protects the handle relative movement adjustment portion 133 from the impact force F.

[0038] (Protection mode when the impact tool 101 falls [2]) 1, 2, and 4, the second shock absorbing rubber 140 is disposed in the battery front region 102C of the housing 102, so that the impact force F acting on the battery 105 can also be absorbed by the second shock absorbing rubber 140. This makes it possible to more effectively protect the battery 105 or the battery mounting section 127 from impacts when dropped. 2, when the battery 105 is attached to the impact tool 101, a separation space 141 is always formed between the battery front surface 105D and the second cushioning rubber 140. Therefore, the second cushioning rubber 140 is not subjected to a compression action except when it is cushioning an impact force, so that deterioration of the second cushioning rubber 140 over time can be reduced.

[0039] (Protection mode for directions other than the external force acting direction D3) As described above, in the handle relative movement amount adjustment portion 133, as shown in Figs. 1 and 2, the protrusion 133B is loosely fitted into the long hole 133A with a slight clearance CL from the inner wall of the long hole 133A. That is, the protrusion 133B is configured to be able to move relatively in directions other than the external force acting direction D3 through the clearance CL (although it is relatively small). Therefore, even if an external force acts in a direction other than the external force acting direction D3, the rotation support shaft 130 compresses the first buffer rubber 132 in accordance with the clearance CL, and the impact force is buffered.

[0040] (Protection when the battery is not installed or when other shock forces are applied) In this embodiment, a case where the impact tool 101 with the battery 105 attached thereto is suddenly dropped is described as an example. Meanwhile, the configurations of the rotation support shaft 130 and the handle relative movement amount adjuster 133 described above relate to a buffering mechanism for the action of an external force between the housing 102 and the handle 120, and do not necessarily require the action of an impact force due to attachment of the battery 105 or a drop. In other words, even if an impact force acts when the battery 105 is not attached or if an impact force acts in a manner other than a drop, such an impact force can be effectively buffered.

[0041] (When the dust collection attachment 160 is attached to the impact tool 101) The impact tool 101 according to this embodiment can be equipped with various types of auxiliary work devices. Typically, as shown in FIG. 6, a dust collection attachment 160 is attached to the front side of the impact tool 101 and serves to suck and collect dust generated during work. The dust collection attachment 160 has a dust suction part 161, a dust transfer part 162, and a dust collection part 163. The dust collection attachment 160 is an example configuration corresponding to the "work auxiliary device".

[0042] The position of the center of gravity of the impact tool 101 with the dust collection attachment 160 (and the battery 105) attached is shown as G2 in Fig. 6. The position of the center of gravity G2 is located in an area shifted forward compared to the position of the center of gravity G1 in Fig. 1 due to the influence of the dust collection attachment 160, which is a heavy object, being attached to the front side. In this case, when the impact tool 101 with the dust collecting attachment 160 integrated therewith falls unexpectedly, the direction connecting the rear end portion 105C of the battery and the center of gravity G2 is vertical. This direction is defined as the external force acting direction D4. As shown in FIG. 6, the external force acting direction D4 is shifted forward in the first direction D1 compared to the external force acting direction D3 (see FIG. 1) in a state in which the dust collection attachment 160 is not attached.

[0043] 1 and 2, in this embodiment, the long axis of the long hole 133A is formed in the handle relative movement amount adjustment part 133 so as to face the external force acting direction D3. The protruding part 133B is loosely fitted in the long hole 133A with a slight clearance from the inner wall part of the long hole 133A. That is, the protruding part 133B can move relatively in directions other than the external force acting direction D3. Therefore, even if the center of gravity of the impact tool 101 shifts and the direction of external force acting in the event of an unexpected drop changes slightly, such as when the dust collection attachment 160 is attached, the rotating support shaft 130 compresses the first cushioning rubber 132 in accordance with the clearance, thereby cushioning the impact force.

[0044] 1, 2 and 4 can sufficiently absorb the shock acting on the battery 105 even if the direction of the external force acting is changed slightly. Therefore, it can effectively respond to the case where the center of gravity of the entire impact tool 101 is changed due to the attachment of a heavy auxiliary work device such as the dust collection attachment 160.

[0045] According to the present embodiment, there is provided a construction technique for the impact tool 101 that can reliably protect equipment even when it is accidentally dropped, etc. This ensures protection of not only the battery 105 in the impact tool 101, but also the battery mounting portion 127 and the rotation support shaft 130. [Explanation of symbols]

[0046] 101: Impact tools 102: Housing (main body) 102A: First housing area 102B: Second housing area 102C: Battery front area 102D: First division 102E: Second division 103: Tool holder 104: Chuck part 105: Battery 105A: Bottom of battery 105B: Rear part of battery 105C: Rear end of battery 105D: Battery front part 110: Motor 110A: Output shaft 110B: Cooling fan 111:Movement conversion mechanism 111A: 1st intermediate shaft 111B: 2nd intermediate shaft 111C: Crank mechanism 111D: Cylinder 111E: Piston 111F: Air chamber 112: Impact mechanism 112A: Striker 112B: Impact bolt 113 Bevel Gear 120: Handle, 120A: Gripping area 120B: Upper housing connection area 120C: Lower housing connection area 120D: First division 120E: Second division 121: Sub-handle 123: Trigger 124: Electric switch 125: Controller 127: Battery mounting part 130: Rotating support shaft 130A: Rotating support shaft convex part 130B: Fixing screw 131: Rotating support receiving part (concave part: housing side) 131A: Clearance 132: First buffer rubber (second elastic member) 133: Handle relative movement amount adjusting part 133A: Long hole (handle side) 133B: Convex part (housing side) 140: Second buffer rubber (third elastic member) 141: Spacing 150: Coil spring (first elastic member) 160: Dust collection attachment 161: Dust suction part 162: Dust transfer part 163: Dust collection part (work assisting device) CL: Clearance D1: First direction (long axis direction) D2: Second direction (vertical direction) D3: External force acting direction (when falling) D4: External force acting direction (when falling with work assisting device) G1: Center of gravity position (of impact tool) G2: Center of gravity position (of impact tool with work assisting device) L1: Long axis distance

Claims

1. A main body having a motor and a mechanism that is driven by the motor to cause the tool tip to perform an impact action; A handle for an operator to grasp; an impact tool having a rotation support shaft that connects the main body and the handle so as to be capable of relative rotation; and a first elastic member that is interposed between the main body and the handle and that buffers transmission of vibration from the main body to the handle when the main body and the handle rotate relatively around the rotation support shaft. the handle has a battery mounting portion on which a battery for driving the motor is mounted, and is configured to be movable relative to the main body in a direction perpendicular to the rotation shaft; a handle relative movement amount adjustment unit that regulates a relative movement amount of the handle with respect to the main body in a predetermined direction so that the relative movement amount is larger than a relative movement amount in a direction other than the predetermined direction, the handle relative movement adjustment portion includes a protruding portion disposed on one of the handle and the main body portion, and a fitting portion disposed on the other of the handle and the main body portion, the fitting portion having a long axis and into which the protruding portion is loosely fitted; the fitting portion is a long hole having a long axis and into which the protrusion is loosely fitted, the long axis direction of the long hole coinciding with the predetermined direction, the handle relative movement amount adjustment unit adjusts the range of relative movement of the handle with respect to the main body portion by restricting the relative movement of the handle with respect to the main body portion so that large relative movement is possible in the predetermined direction and only small relative movement within a range of a clearance provided between the handle and the main body portion is possible in directions other than the predetermined direction, the predetermined direction is an impact input direction defined as a direction in which an impact caused by a drop is directed toward the main body via the battery attached to the battery attachment section when the impact tool with the battery attached thereto is dropped in a state in which a direction from the battery toward a center of gravity of the main body coincides with a vertical direction; An impact tool, characterized in that the direction other than the specified direction is a direction in which the handle moves relative to the main body when an impact acts on the impact tool due to a fall in a direction other than the impact input direction.

2. The impact tool according to claim 1, An impact tool characterized in that a second elastic member is interposed between the main body and the handle around the rotating support shaft, the second elastic member being configured to be compressed when the handle moves relative to the main body in the specified direction and in a direction other than the specified direction.

3. The impact tool according to claim 1 or 2, The impact tool, wherein the handle relative movement amount adjustment portion is disposed in an area spaced apart from the rotation support shaft.

4. The impact tool according to claim 2, The present invention further includes a work support device that is attached integrally to the main body and that shifts a center of gravity of the integrated main body and the work support device in a direction in which the work support device is attached, the direction other than the predetermined direction includes a direction from the battery toward the shifted center-of-gravity position, The second elastic member is disposed between the main body and the handle, radially outwardly of the rotation shaft and over the entire circumference of the rotation shaft, An impact tool, characterized in that an external force acting on the impact tool in a direction from the battery toward the shifted center of gravity position is buffered by compression of the second elastic member.

5. 5. The impact tool according to claim 1, wherein the main body further comprises a third elastic member interposed between the main body and the battery.

6. The impact tool according to claim 5, The impact tool, wherein the third elastic member is normally not in contact with the battery.

7. 7. The impact tool according to claim 1, wherein the rotation shaft is disposed in the main body on a front side of the battery.

8. 8. The impact tool according to claim 1, wherein the first elastic member is formed of a coil spring.

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