Impact tool

Abstract

The present application provides a construction technique of an impact tool. The impact tool (101) has a rotary support shaft (130) connecting a main body (102) and a handle (120) in a relatively rotatable manner, and a first elastic member that cushions transmission of vibration from the main body (102) to the handle (120) when the main body (102) and the handle (120) are relatively rotated. The handle (120) has a battery mounting portion for mounting a battery of a driving motor, and is configured to be relatively movable with respect to the main body (102) across the rotary support shaft (130). The handle (120) also has a handle relative movement amount adjustment portion (133) that limits the relative movement amount of the handle (120) with respect to the main body (102) in a prescribed direction to be greater than the relative movement amount in a direction other than the prescribed direction. Accordingly, the tool can be effectively protected even when dropped accidentally or the like.

Description

TECHNICAL FIELD

[0001] The present application relates to an impact tool having excellent protection of a tool against damage by external force. BACKGROUND

[0002] An example of an impact tool is shown in Japanese Patent Application Laid-Open No. 2014-231126.

[0003] The impact tool has a main body portion in which a motor, a motion conversion mechanism, and an impact mechanism are disposed, a handle which is connected to the main body portion in a manner so as to be relatively rotatable by a rotation support shaft at a rear portion of the main body portion, and a buffer coil spring which is interposed between the main body portion and the handle for reducing transmission of vibration from the main body portion to the handle when the relative rotation is performed. That is, the impact tool has a vibration-proof handle configuration.

[0004] In addition, a battery for driving the motor is disposed in a lower portion of the handle in a manner so as to be detachable.

[0005] The above-described impact tool is a portable tool for performing an impact work in a state where an operator holds the handle, but has a possibility of being dropped by accident. In this case, it is possible that the exposed end portion (exposed rear end portion) of the battery having a relatively heavy weight is directed toward a falling direction during the falling, and thus an impact force from the ground or the like is directly applied to the battery.

[0006] There is a risk that the impact force damages the battery itself or a battery mounting portion provided to the main body portion for mounting the battery. Therefore, it is necessary to avoid the impact applied to the battery as much as possible.

[0007] On the other hand, it is not realistic to take a countermeasure against the dropping by always fixing the portable impact tool, and a measure is desired which can reasonably and effectively protect the battery and even the impact tool to the maximum extent even in the case where the dropping phenomenon occurs.

[0008] PRIOR ART DOCUMENTS

[0009] PATENT DOCUMENTS

[0010] Patent Document 1: Japanese Patent Application Laid-Open No. 2014-231126 SUMMARY

[0011] [PROBLEMS TO BE SOLVED BY THE INVENTION]

[0012] In view of the above-described circumstances, an object of the present application is to provide an impact tool which can reasonably and effectively protect a tool even when dropped by accident or the like.

[0013] [MEANS OF SOLVING THE PROBLEMS]

[0014] To solve the above technical problem, according to one aspect of the present application, an impact tool is constructed,

[0015] The impact tool has a main body portion, a handle, a rotary support shaft, and a first elastic member,

[0016] The main body portion has a motor and a mechanism portion, and the mechanism portion is driven by the motor to cause a tip tool to perform an impact action.

[0017] The handle is held by an operator.

[0018] The rotary support shaft connects the main body portion and the handle in a manner that they can rotate relative to each other.

[0019] The first elastic member is arranged between the main body portion and the handle, and buffers transmission of vibration from the main body portion to the handle when the main body portion and the handle rotate relative to each other around the rotary support shaft.

[0020] The handle has a battery mounting portion for mounting a battery for driving the motor, and is configured to be able to move relative to the main body portion across the rotary support shaft.

[0021] There is also a handle relative movement amount adjustment portion that limits the relative movement amount of the handle with respect to the main body portion in a prescribed direction to be greater than the relative movement amount in a direction other than the prescribed direction.

[0022] In this impact tool, when the main body portion and the handle perform a relative rotation action, the transmission of vibration from the main body portion to the handle is buffered by the elastic member (hereinafter referred to as a "vibration damping action"), and in the case where an unexpected external force acts on the impact tool (typically, in the case where the operator accidentally drops the impact tool), the handle moves relative to the main body portion across the rotary support shaft, whereby the damage caused by the external force to the impact tool is mitigated.

[0023] And in this impact tool, there is a handle relative movement amount adjustment portion that limits the relative movement amount of the handle with respect to the main body portion in a prescribed direction to be greater than the relative movement amount in a direction other than the prescribed direction. Accordingly, for example, the relative movement amount of the handle with respect to the main body portion can be increased in a direction in which damage to the impact tool is particularly large compared to other directions, and the damage caused can be mitigated in particular.

[0024] The impact tool makes at least an impact action of the tip tool, and can also appropriately include a structure with a rotation action. The motor and the mechanism part can be housed in the integrated main body part, or can be housed in a motor housing and a gear housing formed separately.

[0025] The rotation support shaft can be formed integrally with the handle, integrally with the main body part, or separately from the handle and the main body part, and assembled to the handle or the main body part.

[0026] As for the relative movement action of the handle with respect to the main body part via the rotation support shaft, a straight line action is typical, but a curved line or a circular arc shape can also be used. As for "via the rotation support shaft" in the relative movement action, a configuration is typical in which a space is formed around the rotation support shaft, and the handle is moved with respect to the main body part through the space.

[0027] As for the "predetermined direction", a configuration in which the direction is preferably substantially coincident with the input direction of an external force in the case where the external force acts on the impact tool is typical.

[0028] According to the present application, a configuration technique of an impact tool in which a tool can be effectively protected even when dropped by accident or the like is provided. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a front view (partly a cross-sectional view) showing the overall configuration of the impact tool according to the present embodiment.

[0030] Figure 2 is Figure 1 a main part of the impact tool according to the present embodiment.

[0031] Figure 3 is Figure 2 a partial cross-sectional view of I-I of

[0032] Figure 4 is a perspective view showing the configuration of the lower part of the handle and the front side region of the battery.

[0033] Figure 5 is a partial perspective view showing the state in which an external force acts on the impact tool according to the present embodiment when dropped.

[0034] Figure 6 is a front view (partly a cross-sectional view) showing the state in which a dust collecting attachment is attached to the impact tool according to the present embodiment.

[0035] BRIEF DESCRIPTION OF DRAWINGS

[0036] 101: impact tool; 102: housing (main body portion); 102A: 1st housing region; 102B: 2nd housing region; 102C: battery front side region; 102D: 1st divided body; 102E: 2nd divided body; 103: tool holder; 104: chuck portion; 105: battery; 105A: battery lower surface portion; 105B: battery rear surface portion; 105C: battery rear end portion; 105D: battery front surface portion; 110: motor; 110A: output shaft; 110B: cooling fan; 111: motion conversion mechanism; 111A: 1st intermediate shaft; 111B: 2nd intermediate shaft; 111C: crank mechanism; 111D: cylinder; 111E: piston; 111F: air chamber; 112: impact mechanism; 112A: hammer; 112B: striker; 113: bevel gear; 120: handle; 120A: gripping region; 120B: upper side housing connecting region; 120C: lower side housing connecting region; 120D: 1st divided body; 120E: 2nd divided body; 121: sub handle; 123: trigger; 124: electric switch; 125: controller; 127: battery mounting portion; 130: rotary support shaft; 130A: rotary support shaft protrusion; 130B: fixing screw; 131: rotary support bearing receiving portion (recess provided on housing); 131A: gap; 132: 1st buffer rubber (2nd elastic member); 133: handle relative movement amount adjustment portion; 133A: long hole (provided on handle); 133B: protrusion (provided on housing); 140: 2nd buffer rubber (3rd elastic member); 141: separation space; 150: coil spring (1st elastic member); 160: dust collecting attachment; 161: dust suction portion; 162: dust transport portion; 163: dust collecting portion (work assisting tool); CL: gap; D1: 1st direction (long axis direction); D2: 2nd direction (up and down direction); D3: (at the time of falling) external force acting direction; D4: (at the time of falling with work assisting tool) external force acting direction; G1: (of impact tool) center of gravity position; G2: (of impact tool with work assisting tool) center of gravity position; L1: long axis distance. DETAILED DESCRIPTION

[0037] With the above structure, a 2nd elastic member can be provided around the rotary support shaft, the 2nd elastic member being interposed between the main body portion and the handle portion.

[0038] Accordingly, damage to the impact tool by external force is more effectively mitigated.

[0039] In addition, the handle relative movement amount adjustment portion can be provided in a region separate from the rotary support shaft.

[0040] Further, the handle relative movement amount adjustment portion can be configured to have an elongated hole and a protrusion that fits into the elongated hole, and the long axis direction of the elongated hole can coincide with the prescribed direction.

[0041] Further, the prescribed direction can be an impact input direction defined as a direction in which an impact generated by a drop of the impact tool is input to the main body portion via the battery in the case where the impact tool is dropped.

[0042] Typically, the impact input direction is defined as a direction from the rear end portion of the battery toward the main body portion.

[0043] Further, the impact input direction can be a direction from the battery to the center of gravity position of the main body portion.

[0044] Typically, the impact input direction is defined by a line connecting the rear end portion of the battery and the center of gravity position of the impact tool in a state in which the battery is mounted.

[0045] Further, the prescribed direction can be an impact input direction defined as a direction in which an impact generated by a drop of the impact tool is input to the main body portion via the battery in the case where the impact tool is dropped.

[0046] Typically, the impact input direction is defined by a line connecting the rear end portion of the battery and the center of gravity position of the impact tool in a state in which the battery and the work assisting tool are mounted.

[0047] Further, the main body portion can further have a third elastic member interposed between the main body portion and the battery.

[0048] Further, the third elastic member can be in a non-contact state with the battery at ordinary times.

[0049] In other words, a prescribed separation distance is set between the third elastic member and the battery at ordinary times. Further, in the case where an impact force acts on the battery, the third elastic member and the battery are in a contact state, and the impact force is buffered by the third elastic member.

[0050] Further, the rotation support shaft can be disposed at a position in the main body portion that is on the front side of the battery.

[0051] Further, the first elastic member can be configured by a coil spring.

[0052] Hereinafter, the impact tool 101 according to the embodiment will be described with reference to the drawings. Figures 1-5 The impact tool 101 according to the embodiment will be described.

[0053] The impact tool 101 is an example of the "impact tool" to which the present application pertains.

[0054] In Figure 1 , the overall structure of the impact tool 101 is shown as a front view.

[0055] In the present embodiment, for ease of explanation, the long axis direction (also referred to as the length direction: in Figure 1 , the left-right direction of the paper) of the impact tool 101 is defined as the first direction D1.

[0056] In addition, the up-down direction (also referred to as the vertical direction: in Figure 1 , the up-down direction of the paper) intersecting the long axis direction is defined as the second direction D2.

[0057] In addition, unless otherwise specified, the direction orthogonal to the first direction and the second direction is defined as the width direction or the left-right direction.

[0058] In addition, the direction of the external force acting on the impact tool 101 from the falling surface in the case where the impact tool 101 falls is defined as D3, the details of which are described later.

[0059] (Overall structure)

[0060] As shown in Figure 1 , the impact tool 101 generally includes a housing 102, a handle 120, and a sub-handle 121 from the appearance.

[0061] The housing 102 is an example corresponding to the "main body portion".

[0062] 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 side region 102C forming a lower portion.

[0063] (Internal structure of the housing 102)

[0064] The motor 110 is disposed in the first housing region 102A. The motor 110 has an output shaft 110A, a cooling fan 110B. The motor 110 is disposed so that the output shaft 110A extends in the second direction D2. In the present embodiment, the motor 110 is a brushless motor. The brushless motor can ensure a large power with a relatively small size, and thus is suitable for use in the impact tool 101.

[0065] The motion conversion mechanism 111 and the impact mechanism 112 are disposed in the second housing region 102B. 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.

[0066] The impact mechanism 112 has a ram 112A and a striker 112B.

[0067] The first intermediate shaft 111A is connected to the output shaft 110A of the motor 110 and is driven to rotate. The first intermediate shaft 111A rotates the crank mechanism 111C about the second direction D2. When the crank mechanism 111C rotates about the second direction D2, the piston 111E connected to the crank mechanism 111C in a link shape performs a reciprocating motion in a straight line in the first direction Dl within the cylinder 111D.

[0068] The ram 112A is disposed within the cylinder 111D. The ram 112A moves in the first direction Dl by pressure variation of the air chamber 111F accompanying the reciprocating motion of the piston 111E. When the ram 112A performs a moving motion, the kinetic energy of the ram 112A is transmitted to the striker 112B. Accordingly, the striker 112B moves in the first direction Dl within the tool holder 103, and a (not shown for convenience) tip tool performs a moving motion in a straight line. As a result, the tip tool performs an impact work. In addition, a chuck portion 104 for mounting the tip tool to the tool holder 103 is provided at a tip region of the second housing region 102B.

[0069] 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 about the first direction Dl through a bevel gear 113. By rotating the tool holder 103 about the first direction Dl, a (not shown for convenience) tip tool rotates about the first direction Dl. Accordingly, a rotating work is performed.

[0070] In addition, either one of only an impact work and a rotating work or both of them can be selected by an operator.

[0071] (Structure of the handle 120)

[0072] The handle 120 generally has a grip region 120A, an upper housing connection region 120B, and a lower housing connection region 120C.

[0073] The grip region 120A extends in substantially perpendicular (slightly crossing) relation to the first direction Dl and is gripped by an operator. In the grip region 120A, a trigger 123 for operating the impact tool 101 and an electric switch 124 connected to the trigger 123 are provided at an upper region thereof.

[0074] The upper-side housing connecting region 120B is integrally connected to the grip region 120A and extends substantially in the first direction Dl to be connected to the housing 102 with the coil spring 150 interposed therebetween. By providing the coil spring 150 interposed between the upper-side housing connecting region 120B and the housing 102, the upper-side housing connecting region 120B is relatively movable with respect to the housing 102 in the first direction Dl. The coil spring 150 is a structural example corresponding to the "first elastic member".

[0075] The lower-side housing connecting region 120C is integrally connected to the grip region 120A and extends substantially in the first direction Dl to be connected to the housing 102 with the rotary support shaft 130 interposed therebetween. By providing the rotary support shaft 130 interposed between the lower-side housing connecting region 120C and the housing 102, the lower-side housing connecting region 120C is relatively rotatable with respect to the housing 102 about the rotary support shaft 130. The rotary support shaft 130 is a structural example corresponding to the "rotary support shaft".

[0076] In the lower-side housing connecting region 120C, a controller 125 for driving control of the motor 110 is provided. In addition, a battery mounting portion 127 is provided on the lower surface side of the lower-side housing connecting region 120C.

[0077] (Structure of sub-handle 121)

[0078] The sub-handle 121, also referred to as an auxiliary handle or the like, is mounted in a detachable manner at the top end region of the second housing region 102B. In a state where the sub-handle 121 is mounted to the impact tool 101, for example, in a case where the operator grips the handle 120 with the right hand, the sub-handle 121 is gripped with the left hand, which is helpful in assisting the work.

[0079] (Structure of battery 105)

[0080] The battery 105 is mounted to the above-described battery mounting portion 127 by a sliding operation in the first direction Dl. The battery 105 supplies a driving current to the motor 110 provided in the housing 102.

[0081] The battery 105 in a state of being mounted to the battery mounting portion 127 has:

[0082] (1) a battery lower surface portion 105A that is substantially coplanar with the bottom surface of the housing 102;

[0083] (2) a battery rear surface portion 105B that defines the rear surface of the impact tool 101 in a state where the battery 105 is mounted;

[0084] (3) A battery rear end portion 105C defined as a boundary region of the battery lower surface portion 105A and the battery rear surface portion 105B, and defined as a rear end portion of the lower side of the impact tool 101 in a state where the battery 105 is installed;

[0085] (4) A battery front surface portion 105D facing in an opposite direction to a battery front side region 102C formed on the lower side of the second housing region 102B of the housing 102.

[0086] In addition, in the battery front side region 102C of the housing 102, the second buffer rubber 140 is arranged in an opposite direction in a state where a slight separation space 141 is provided between the battery front surface portion 105D and the battery 105 in a state where the battery 105 is installed in the battery mounting portion 127. The second buffer rubber 140 is a structural example corresponding to the "third elastic member".

[0087] (Structure of the rotation support shaft 130 and the surrounding region thereof)

[0088] Next, the surrounding structure of the rotation support shaft 130 will be described in detail with reference to Figure 2 , Figure 3 .

[0089] As shown in Figure 2 , the lower housing connection region 120C of the handle 120 is connected to the battery front side region 102C of the housing 102 in a manner that can rotate relative to each other by the rotation support shaft 130.

[0090] In addition, in a region separated from the rotation support shaft 130 by a predetermined distance (in the present embodiment, a lower region in a direction that intersects the first direction Dl and the second direction D2, respectively), a protrusion 133B formed on the housing 102 is arranged in a long hole 133A formed on the handle 120 in a clearance fit state. The long hole 133A and the protrusion 133B constitute a handle relative movement amount adjustment portion 133. The long hole 133A has a long axis extending in the external force application direction D3 described later. The protrusion 133B is fitted in the long hole 133A in a state where there is a slight gap CL (play) between the inner wall portion of the long hole 133A and the protrusion 133B. Accordingly, the protrusion 133B is configured to be able to relatively move relatively large in the direction of the long axis, i.e., the external force application direction D3, and relatively small in a direction other than the long axis, i.e., a direction other than the external force application direction D3. The handle relative movement amount adjustment portion 133 is a structural example corresponding to the "handle relative movement amount adjustment portion".

[0091] A cross-sectional view of the handle 120 taken along line I-I is shown in Figure 3 . Figure 2

[0092] As shown in Figure 3 ​As shown, the rotation support shaft 130 has rotation support shaft protrusions 130A in a pair in the left-right direction. In order to form the handle 120, a first divided body 120D and a second divided body 120E each formed in a split shape are combined together, and are fixed with a fixing screw 130B, whereby the rotation support shaft 130 is formed. That is, the rotation support shaft 130 is formed by a structural element of the handle 120 in an integrated manner with the handle 120.

[0093] The rotation support shaft 130 is held in a rotatable manner by a rotation support bearing receiving portion 131 formed in a recessed shape on the housing 102. Specifically, in order to form the housing 102, a first divided body 102D and a second divided body 102E each formed in a split shape are combined together, whereby the rotation support bearing receiving portions 131 in a pair in the left-right direction are formed as recessed space portions. Further, the rotation support shaft protrusions 130A are fitted to the rotation support bearing receiving portions 131 in a state of being separated by a gap 131A. Further, the first buffer rubber 132 interposed between the rotation support shaft 130 and the rotation support bearing receiving portions 131 is disposed in a manner of filling the gap 131A. The first buffer rubber 132 is configured as an O-shaped rubber ring, and receives the rotation support shaft 130 between the rotation support shaft protrusions 130A and the rotation support bearing receiving portions 131 throughout the radial direction within the rotation support bearing receiving portions 131.

[0094] According to the above-described structure, the housing 102 and the handle 120 are capable of relative rotation around the rotation support shaft 130, and are capable of relative movement through the gap 131A with the rotation support shaft 130 interposed therebetween. Further, it is configured that, in a case where the housing 102 and the handle 120 are relatively moved with the rotation support shaft 130 interposed therebetween, the first buffer rubber 132 is compressed in accordance with the relative movement distance, whereby the impact between the housing 102 and the handle 120 is buffered.

[0095] The first buffer rubber 132 is a structural example corresponding to the "second elastic member".

[0096] Further, as described with reference to Figure 2 As has been described, in a region separated by a prescribed distance from the rotation support shaft 130, the handle relative movement amount adjusting portion 133 is formed by the gap fit between the protrusion 133B formed on the housing 102 and the long hole 133A formed on the handle 120.

[0097] As Figure 3As shown in detail, in order to form the handle 120, the first divided body 120D and the second divided body 120E each formed in a split shape are combined together, whereby a long hole 133A formed in a pair in the left-right direction and integrated with the handle 120 is formed. Similarly, in order to form the housing 102, the first divided body 102D and the second divided body 102E each formed in a split shape are combined together, whereby a protrusion 133B formed in a pair in the left-right direction and integrated with the battery front side region 102C of the housing 102 is formed.

[0098] (Structure of the battery front side region 102C of the housing 102)

[0099] The structure of the peripheral region of the battery front side region 102C of the housing 102 is shown in Figure 4 .

[0100] In the front side region 102C of the housing 102, the above-described second buffer rubber 140 is arranged in a pair in the left-right direction.

[0101] Further, a battery mounting portion 127 is arranged on the lower side of the lower side housing connecting region 120C of the handle 120. The battery mounting portion 127 has a slide guide portion and a power supply terminal at the time of mounting a battery.

[0102] (Working mode of the impact tool 101)

[0103] Next, the working mode of the impact tool 101 according to the present embodiment will be described.

[0104] The operator manually operates the trigger 123 in a state of holding the handle 120 (or in a state of holding the handle 120 and the sub handle 121, respectively) as shown in the drawing. Figure 1 The controller 125 receives a trigger ON signal from the electric switch 124 linked to the trigger 123, and performs drive control of the motor 110. In the present embodiment, a brushless motor is used, and the controller 125 drives the motor 110 by so-called PWM control.

[0105] The rotational output of the motor 110 is converted into linear motion of the piston 111E in the first direction D1 in the cylinder 111D through the output shaft 110A, the first intermediate shaft 111A, and the crank mechanism 111C. The ram 112A is moved in the first direction D1 by pressure variation of the air chamber 111F in the cylinder 111D due to the linear motion of the piston 111E. When the ram 112A is moved, the kinetic energy of the ram 112A is transmitted to the striker 112B, which is moved in the first direction D1 in the tool holder 103, and a (for convenience, not shown) tip tool is moved linearly. Accordingly, the tip tool performs an impact work. This working mode is defined as a hammering mode.

[0106] In addition, in the impact tool 101 according to the present embodiment, it is also possible to select Figure 1 The second intermediate shaft 111B illustrated in Fig. 2 is driven to rotate by the output shaft 110A of the motor 110. This operation mode is defined as a drill mode. In this case, the second intermediate shaft 111B rotates the tool holder 103 in the first direction Dl via the bevel gear 113. The (not illustrated for convenience) tip tool is rotated in the first direction Dl by the tool holder 103 rotated in the first direction Dl, and a rotary operation is performed.

[0107] In the present embodiment, the operator can select any of the operation modes in which only the hammer mode described above is performed, only the drill mode is performed, and the hammer drill mode in which the hammer mode and the drill mode are combined is performed.

[0108] (Action of the anti-vibration handle)

[0109] In a case where the impact tool 101 is used to perform an operation on a workpiece, the housing 102 in which the motion conversion mechanism 111 and the impact mechanism 112 are arranged is likely to generate relatively strong vibrations. In order to suppress transmission of the vibrations from the housing 102 to the handle 120, the anti-vibration handle mechanism functions. That is, the housing 102 and the handle 120 can relatively rotate about the rotation support shaft 130, and the vibrations from the housing 102 to the handle 120 are suppressed by compression of the coil spring 150 by the relative rotation.

[0110] (Protection method [1] in a case where the impact tool 101 falls)

[0111] The impact tool 101 according to the present embodiment is a portable tool. Unlike a stationary tool, the operator sometimes holds the impact tool 101 to move in a work site, or places the impact tool 101 at a high place. In this state, the following situation is assumed: in a case where the impact tool 101 falls Figure 1 In a case where the impact tool 101 illustrated in Fig. 1 falls by accident, the battery rear end portion 105C faces downward, and a line connecting the battery rear end portion 105C and the center of gravity G1 of the impact tool 101 in a state where the battery 105 is mounted is a vertical direction. In Figure 5 This state is illustrated in Fig. 2. This state is caused by the battery 105 mounted to the impact tool 101 being a corresponding heavy object.

[0112] In this case, an impact force when the fallen impact tool 101 abuts against the ground or the like can act on the battery rear end portion 105C. In other words, the line connecting the battery rear end portion 105C and the center of gravity G1 defines the vertical direction when the impact tool 101 falls, and defines the direction in which the impact force acts when falling. In the present specification, this direction is defined as the external force acting direction D3.

[0113] This impact force can damage the battery 105, the battery mounting portion 127, and the like, and should be avoided as much as possible.

[0114] In the present embodiment, as shown in Figure 2 , Figure 3 the housing 102 and the handle 120 are relatively rotatable about the rotation support shaft 130, and are relatively movable through the gap 131A across the rotation support shaft 130. In addition, in a case where the housing 102 and the handle 120 are relatively moved across the rotation support shaft 130, the first buffer rubber 132 is compressed in the direction of the relative movement in accordance with the relative movement distance. Thereby, a structure that buffers the impact between the housing 102 and the handle 120 is realized.

[0115] Specifically, as shown in Figure 5 , in a case where the impact tool 101 in the state where the battery 105 is mounted is dropped with the vertical direction as the external force application direction D3, the impact force F from the abutting surface is input to the battery rear end portion 105C in the external force application direction D3.

[0116] In this case, as shown in Figure 2 , in the handle relative movement amount adjustment portion 133, the long axis of the long hole 133A is oriented in the external force application direction D3. Therefore, the protrusion 133B that is arranged in the gap fit state in the long hole 133A is configured to be movable in the long hole 133A by a relatively long distance (the long axis length L1 shown in Figure 2 ). Therefore, in a case where the impact force F at the time of the drop is input in the external force application direction D3, the protrusion 133B moves in the long axis direction of the long hole 133A by a relatively long distance, and compresses the first buffer rubber 132. As a result, the first buffer rubber 132 is relatively greatly compressed in the external force application direction D3, and the impact force F can be effectively buffered.

[0117] In addition, in the present embodiment, the following structure is adopted: the handle relative movement amount adjustment portion 133 is protected from the impact force F by being configured to complete the buffering action of the first buffer rubber 132 before the protrusion 133B completes the movement of the long axis length L1 of the long hole 133A.

[0118] (Protection method [2] in a case where the impact tool 101 is dropped)

[0119] Furthermore, as shown in Figure 1 , Figure 2 , Figure 4As shown, the second buffer rubber 140 is disposed in the battery front region 102C of the housing 102, thereby the impact force F acting on the battery 105 can also be buffered by the second buffer rubber 140. Therefore, the battery 105 and even the battery mounting portion 127 can be more effectively protected from impacts during drops.

[0120] In addition, such as Figure 2 As shown, with the battery 105 installed on the impact tool 101, a separation space 141 is normally formed between the front surface portion 105D of the battery and the second buffer rubber 140. Therefore, the second buffer rubber 140 is not subjected to compression except when buffering impact force, thus reducing the deterioration of the second buffer rubber 140 over time.

[0121] (Protection methods for directions other than D3 where external force is applied)

[0122] Furthermore, as described above, in the handle relative movement adjustment unit 133, such as Figure 1 , Figure 2 As shown, the protrusion 133B is clearance-fitted within the elongated hole 133A with a small gap CL between it and the inner wall of the elongated hole 133A. That is, the protrusion 133B is configured such that it can move relative to the protrusion through this gap CL (albeit a relatively small gap) in directions other than the direction of the external force D3. Therefore, even when an external force is applied in a direction other than the direction of the external force D3, the first buffer rubber 132 can be compressed by the rotating support shaft 130 according to this gap CL to buffer the impact force.

[0123] (Protection when no battery is installed or when subjected to other impacts)

[0124] In this embodiment, the case of an impact tool 101 accidentally falling while the battery 105 is installed is described as an example. On the other hand, the structure of the aforementioned rotary support shaft 130 and handle relative movement adjustment part 133 is a buffer mechanism relating to the external force acting between the housing 102 and the handle 120, and does not require the installation of the battery 105 or the impact force due to a fall as essential requirements. In other words, even when an impact force is applied without the battery 105 installed, or in a manner other than falling, the impact force can be effectively buffered.

[0125] (When the dust collection attachment 160 is installed on the impact tool 101)

[0126] The impact tool 101 described in this embodiment can be equipped with various work aids. Typically, for example... Figure 6As shown, the dust collecting attachment 160 is installed on the front side of the impact tool 101 in a manner to collect dust generated at the time of work.

[0127] The dust collecting attachment 160 has a dust suction portion 161, a dust transport portion 162, and a dust collecting portion 163. The dust collecting attachment 160 is a structural example corresponding to the "work assisting tool".

[0128] The center of gravity position of the impact tool 101 in the state where the dust collecting attachment 160 (and the battery 105) is installed is indicated as G2 in Figure 6 . The center of gravity position G2 is provided in a region that is shifted to the front side compared to the center of gravity position Gl in Figure 1 , which is affected by the installation of the dust collecting attachment 160 as a corresponding weight on the front side.

[0129] In this case, when the impact tool 101 in the state integrated with the dust collecting attachment 160 is accidentally dropped, it is dropped in a manner that the direction connecting the battery rear end portion 105C and the center of gravity position G2 becomes the vertical direction. This direction is defined as the external force application direction D4.

[0130] As shown in Figure 6 , the state of the external force application direction D4 is shifted to the front side in the first direction Dl compared to the external force application direction D3 (refer to Figure 1 ) in the state where the dust collecting attachment 160 is not installed.

[0131] In the present embodiment, as already explained using Figure 1 , Figure 2 , in the handle relative movement amount adjustment portion 133, the long axis of the long hole 133A is oriented toward the external force application direction D3. Also, the protrusion 133B is clearance-fitted within the long hole 133A in a state where there is a slight gap between the inner wall portion of the long hole 133A and the protrusion 133B. That is, the protrusion 133B is also able to move relatively in a direction other than the external force application direction D3.

[0132] Therefore, as in the case where the dust collecting attachment 160 is installed, even in the case where the center of gravity position of the impact tool 101 is shifted and the external force application direction slightly changes at the time of accidental dropping, the first buffer rubber 132 is compressed by the rotation support shaft 130 according to the gap, and the impact force is buffered.

[0133] Also, even in the case where the orientation of the external force application direction is slightly changed, Figure 1 , Figure 2 , Figure 4The second buffer rubber 140 shown is also able to sufficiently buffer an impact applied to the battery 105. Therefore, even in the case where the center of gravity position of the impact tool 101 as a whole is changed by mounting a work assisting tool such as the dust collecting attachment 160 having weight, it is possible to effectively cope with.

[0134] According to the present embodiment, a construction technique of an impact tool 101 that can effectively protect equipment even at the time of an accidental drop or the like is provided. Thereby, not only the battery 105 in the impact tool 101 but also protection of the battery mounting portion 127 and protection of the rotary support shaft 130 can be ensured.

Claims

1. An impact tool characterized by comprising: a main body portion, a handle, a rotary support shaft, and a first elastic member, the main body portion has a motor and a mechanism portion that is driven by the motor to cause a tip tool to perform an impact action; the handle is held by an operator; the rotary support shaft connects the main body portion and the handle in a manner that they can relatively rotate; the first elastic member is interposed between the main body portion and the handle to dampen transmission of vibration from the main body portion to the handle when the main body portion and the handle relatively rotate around the rotary support shaft; the handle has a battery mounting portion for mounting a battery for driving the motor, and is configured to relatively move with respect to the main body portion in a direction orthogonal to the rotary support shaft; a handle relative movement amount adjustment portion that limits the relative movement amount of the handle with respect to the main body portion in a prescribed direction to be greater than the relative movement amount in a direction other than the prescribed direction; the handle relative movement amount adjustment portion has a protrusion and a fitting portion, wherein the protrusion is provided to either one of the handle and the main body portion, the fitting portion is provided to the other one of the handle and the main body portion, the fitting portion has a long axis, and the protrusion is fitted in the fitting portion with a gap; the fitting portion is a long hole having a long axis, and the protrusion is fitted in the long hole with a gap so that the long axis direction of the long hole coincides with the prescribed direction; with respect to the relative movement of the handle with respect to the main body portion, the handle relative movement amount adjustment portion limits the relative movement of the handle with respect to the main body portion in such a manner that the handle can relatively move relatively large in the prescribed direction and can relatively move only within the range of a gap provided between the handle and the main body portion in a direction other than the prescribed direction, to adjust the range of the relative movement of the handle with respect to the main body portion; the prescribed direction is an impact input direction defined as a direction in which an impact generated by a fall is input to the main body portion via the battery mounted in the battery mounting portion when the impact tool in a state where the battery is mounted is dropped in a state where a direction from the battery to a center of gravity position of the main body portion coincides with a vertical direction; the direction other than the prescribed direction is a direction in which the handle relatively moves with respect to the main body portion when an impact is applied to the impact tool due to a drop in a direction other than the impact input direction.

2. The impact tool according to claim 1, characterized by comprising: a second elastic member provided around the rotary support shaft, the second elastic member being interposed between the main body portion and the handle portion and configured to be compressed when the handle relatively moves with respect to the main body portion in the prescribed direction and the direction other than the prescribed direction.

3. The impact tool according to claim 1 or 2, characterized by comprising: the handle relative movement amount adjustment portion is provided in a region separate from the rotary support shaft.

4. The impact tool according to claim 2, wherein the work assisting tool is integrally attached to the main body, the center of gravity of the main body and the work assisting tool being shifted toward the direction in which the work assisting tool is attached, the direction other than the prescribed direction includes a direction from the battery to the shifted center of gravity, the second elastic member is disposed between the main body and the handle, outside the rotary support shaft in the radial direction, and around the entire circumference of the rotary support shaft, and is configured to absorb an external force applied to the impact tool in the direction from the battery to the shifted center of gravity by compression of the second elastic member.

5. The impact tool according to claim 1 or 2, wherein the main body further has a third elastic member interposed between the main body and the battery.

6. The impact tool according to claim 5, wherein the third elastic member is normally in a non-contact state with the battery.

7. The impact tool according to claim 1 or 2, wherein the rotary support shaft is disposed in the main body at a position on the front side of the battery.

8. The impact tool according to claim 1 or 2, wherein the first elastic member is composed of a coil spring.

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