Impact tool

Abstract

The invention provides an impact tool. The impact tool is provided with a motor, an impact mechanism, a shell and a handle. The motor is provided with a motor shaft rotating around a motor rotation axis. A percussion mechanism including a cylinder and a percussion member adjacent to an air chamber defined in the interior of the cylinder, the percussion mechanism converting a rotational motion of the motor shaft into a linear motion of the percussion member along a predetermined percussion axis by means of an air spring of the air chamber; the housing is provided with: a front end part including a top end surface for mounting a top end tool; and a rear end portion including a rear surface on the opposite side to the tip surface, the housing accommodating the motor and the impact mechanism; the handle is configured to be held by a user. The motor rotation axis is parallel to the impact axis. The rear end of the handle is disposed at the rear end portion. Therefore, the vibration of the impact tool is suppressed, and the impact force of the top end tool is fully obtained.

Description

Technical Field

[0001] The present invention relates to an impact tool. Background Art

[0002] A power tool is known that has: a motor driven by electric power supplied from a battery; a cam connected to the motor shaft; and a tip tool connected to the cam. For example, International Publication No. 2023 / 025719 describes a power tool that uses the driving force of a motor to rotate a cam and converts the rotational motion of the cam into a reciprocating motion of the tip tool. Summary of the Invention

[0003] However, in the prior art, since the driving force of the motor is mechanically converted into the reciprocating motion of the tip tool, the vibration of the power tool may increase, and in addition, the impact force of the tip tool may not be sufficiently obtained.

[0004] According to a first aspect of the present invention, there is provided an impact tool. The impact tool includes a motor, an impact mechanism, a housing, and a handle. The motor has a motor shaft that rotates about a motor rotation axis. The impact mechanism includes a cylinder and an impact member adjacent to an air chamber defined inside the cylinder, and uses the air spring of the air chamber to convert the rotational motion of the motor shaft into a linear motion of the impact member along a predetermined impact axis. The housing has a front end portion including a top surface for mounting a tip tool and a rear end portion including a back surface opposite to the top surface, and the housing houses the motor and the impact mechanism. The handle is configured to be held by a user. The motor rotation axis and the impact axis are parallel to each other. The rear end of the handle is disposed at the rear end portion.

[0005] In the impact tool according to the above aspect, by using an impact mechanism with an air spring, compared with an impact mechanism that mechanically transmits kinetic energy, the vibration of the impact tool can be suppressed, and a larger amount of kinetic energy can be transmitted to the tip tool. In addition, by disposing the handle at the rear end portion of the housing, it is easy to apply a force to push the tip tool along the impact axis against the processing object, and an impact tool having a high impact force generated by the tip tool can be provided. Brief Description of the Drawings

[0006] Figure 1 It is an explanatory view showing the external structure of an electric shovel according to the first embodiment. Figure 2 It is an explanatory view showing the structure of a battery mounting portion. Figure 3 It is showing Figure 1 a cross-sectional view taken along line III-III. Figure 4 It is an explanatory diagram showing the structure of the impact mechanism. Figure 5 It is an explanatory diagram showing the structure of the anti-aircraft hitting mechanism. Figure 6 It is showing Figure 4 a cross-sectional view of the VI-VI position of Figure 7 It is an explanatory diagram showing the external structure of the handle of the electric shovel according to the first embodiment. Figure 8 It is an explanatory diagram showing the layout structure of the electric shovel from a top view. Figure 9 It is an explanatory diagram showing the structure of the electric shovel according to the second embodiment. Figure 10 It is showing Figure 9 a cross-sectional view of the X-X position of Figure 11 It is an explanatory diagram showing the structure of the electric shovel according to the third embodiment. [Explanation of reference numerals] 20, 20b: motor; 22: motor body; 24: motor shaft; 30: battery mounting portion; 32: guide rail; 34: terminal; 36: side wall portion; 36T: top; 40: controller; 50: impact mechanism; 52: impact portion; 54: motion conversion portion; 56: anti-dry fire mechanism; 58: rotation limiting mechanism; 60, 60b, 60c: housing; 61: front end portion; 62: rear end portion; 63: impact receiving portion; 64: side; 64R: recess; 68: anti-slip portion; 70, 70b, 70c: handle; 70B: rear end; 70F: front end; 72: front side connecting portion; 74: rear side connecting portion; 74CP: midpoint; 74F: front end; 74b: connecting portion; 76: gripping portion; 76B: gripping back; 76BB: rear end; 76BF: front end; 76F: gripping opposite portion; 76T: top end; 76TF: front end; 76UP: apex; 76b: gripping portion; 77: trigger; 77c: switch; 78: switch; 79: protruding portion; 79B: bottom; 80: light emitting portion; 90: tool holder; 92: insertion hole; 100, 100b, 100c: impact tool; 520: cylinder; 522: piston; 524: impact member; 526: bolt; 541: pinion; 542: intermediate gear; 543: intermediate shaft; 544: transmission member; 546: motion conversion member; 546A: arm portion; 546R: rotating body; 546S: swing member; 562: transmission fitting portion; 564: conversion fitting portion; 566: biasing member; 568: connecting portion; 582: track portion; 584: groove portion; 612: top end face; 612B: top end position; 612F: top end position; 622: back face; 624: motor receiving portion; BAT: battery; DB, DB2: disassembly and assembly direction; FD: protruding direction; FG: finger; GD: straight line; HD: extending direction; MX: motor rotation axis; SP: air chamber; SX: transmission shaft rotation axis; TT: top end tool; TX: impact axis; UT: impact unit. Detailed Description of the Invention

[0007] Hereinafter, representative and non-limiting specific examples of the present invention will be described in detail with reference to the accompanying drawings. This detailed description merely shows the details of the preferred examples for implementing the present invention to those skilled in the art, and does not mean to limit the scope of the present invention. In addition, the additional features and technical solutions disclosed below are for further providing improved devices, their manufacturing methods and usage methods, and can be used alone or together with other features or technical solutions.

[0008] In addition, the combination of features or processes disclosed in the following detailed description is not essential for implementing the present invention in the broadest sense, and is merely described for the purpose of specifically illustrating representative specific examples of the present invention. Moreover, the various features of the above-described and below-described representative specific examples and the various features described in the independent and dependent claims do not have to be combined as in the specific examples described herein or in the recited order when providing additional and useful embodiments of the present invention.

[0009] All features described in this specification and / or the claims, which are different in structure from the features described in the embodiments and / or the claims, are disclosed separately and independently of each other, as limitations on the disclosure of the original application and the specific matters of the claims. Moreover, the description related to all numerical ranges and groups or sets represents the disclosure of the intermediate structures therein, as limitations on the disclosure of the original application and the specific matters of the claims.

[0010] In one or more embodiments, it may be that a motor housing portion for housing the motor is provided at the rear end portion. According to the impact tool of this mode, by disposing the motor at the rear end portion of the housing, the size of the housing in the direction intersecting the impact axis can be reduced.

[0011] In one or more embodiments, it may be that there is also a battery mounting portion that can detachably mount a battery that supplies power for driving the motor to the motor. The impact axis may pass through the battery mounting portion. According to the impact tool of this mode, compared with the case where the battery mounting portion is provided on the side surface of the housing or the like, the size of the housing in the direction intersecting the impact axis can be reduced.

[0012] In one or more embodiments, it may be that the impact axis passes through the motor. According to the impact tool of this mode, the size of the housing in the direction intersecting the impact axis can be reduced.

[0013] In one or more embodiments, it may be that the impact mechanism has a motion conversion portion that converts the rotational motion of the motor shaft into a linear motion of the impact member. It may be that the handle is connected to the side surface of the housing. It may be that the handle is disposed on the side opposite to the motion conversion portion across the impact axis. According to the impact tool of this mode, by disposing the handle near the impact axis, it is easy to push the handle forward while holding the handle. Therefore, it is easy for the user to perform the action of pushing the tip tool against the object to be processed.

[0014] In one or more embodiments, it may be that, in a direction orthogonal to the motor rotation axis and in a top view of the impact tool observed in a direction passing through the handle and the impact mechanism, at least a part of the handle overlaps at least a part of the impact mechanism. In the impact tool according to this embodiment, by disposing the handle directly above the impact mechanism where the weight tends to be large, it is easy for the user to obtain balance, and an impact tool with good operability for the user can be provided.

[0015] In one or more embodiments, it may be that the handle has a rear connection portion, a front connection portion, and a gripping portion, wherein the rear connection portion connects the rear end of the handle to the rear end portion; the front connection portion connects the front end of the handle to the side surface of the housing; and the gripping portion connects the rear connection portion and the front connection portion. In the impact tool according to this embodiment, since the handle and the housing are formed in a ring shape, an impact tool with good operability for the user can be provided.

[0016] In one or more embodiments, it may be that the gripping portion is inclined with respect to the impact axis so as to be away from the impact axis from the rear end portion toward the top surface. In the impact tool according to this embodiment, an impact tool that is easy to lift and whose tip tool can be easily pushed forward by operating the handle can be provided.

[0017] In one or more embodiments, it may be that the length of the gripping portion along the impact axis is at least one-half of the length of the housing from the back surface to the top surface. In the impact tool according to this embodiment, it is easy for the user to obtain balance, and an impact tool with good operability for the user can be provided.

[0018] In one or more embodiments, it may be that the handle has a connection portion and a gripping portion, wherein the connection portion connects the rear end of the handle to the rear end portion; and the gripping portion extends from the connection portion in an extending direction intersecting the impact axis. It may be that the extending direction is configured such that the direction component in a direction orthogonal to the impact axis is larger than the direction component in the direction along the impact axis. In the impact tool according to this embodiment, it is easy for the user to push the handle from the rear side while holding the handle, and an impact tool with high workability can be provided.

[0019] In one or more embodiments, it may be that the front end of the handle is separated from the housing. It may be that the gripping portion has a protruding portion that protrudes from the gripping portion in a protruding direction intersecting the extending direction. The impact tool according to this mode can support the protruding portion while holding the holding portion, and can provide an impact tool with good operability for the user.

[0020] In one or more embodiments, it may be that a battery mounting portion is further provided at the rear end portion, and the battery mounting portion can detachably mount a battery that supplies power for driving the motor to the motor. The detachment and attachment direction of the battery on the battery mounting portion intersects the impact axis and is in the direction passing through the handle. With the impact tool according to this mode, even when the user holds the handle with one hand, the user can easily detach and attach the battery with the other hand.

[0021] In one or more embodiments, it may be that a light emitting portion is further provided, and the light emitting portion can irradiate light to the working area. With the impact tool according to this mode, it can illuminate the tip tool, the processing object or its surroundings, and can improve the visual confirmation of the working area of the impact tool.

[0022] A. First Embodiment: Hereinafter, the impact tool 100 according to the first embodiment will be described with reference to the drawings. In the present embodiment, a power shovel will be described as an example of the impact tool. The power shovel is a handheld electric tool used for operations such as excavation or crushing of sand, gravel, coal, snow, etc. The power shovel is configured to be able to use the driving force of the motor to cause the shovel blade (shovel), which is the tip tool TT mounted at the tip, to perform a linear reciprocating movement (hereinafter, also referred to as "hammer movement") along a predetermined impact axis TX. The use of the shovel blade is, for example, for civil engineering, agriculture, or households. The shovel blade is sometimes also referred to as a "shovel" or a "scoop". In addition, as will be described later, the impact tool 100 can also appropriately cope with operations other than excavation operations by replacing the tip tool TT.

[0023] In this specification, for the sake of convenience of explanation, the extending direction of the impact axis TX is defined as the "front-rear direction of the impact tool 100". In the front-rear direction, the tip surface 612 side where the tool holder 90 (refer to Figure 3 ) is arranged is defined as the "front side of the impact tool 100", and the opposite side is defined as the "rear side of the impact tool 100". In addition, the direction orthogonal to the impact axis TX and the transmission shaft rotation axis SX (refer to Figure 3 ) is defined as the "up-down direction of the impact tool 100". In the up-down direction, the direction from the transmission shaft rotation axis SX to the impact axis TX is defined as the upper side, and the opposite direction is defined as the lower side. In addition, the direction orthogonal to the front-rear direction and the up-down direction is defined as the left-right direction.

[0024] The impact tool 100 has a housing 60 and a handle 70 connected to the housing 60. The handle 70 is the part held by the user. The structure of the handle 70 will be described later.

[0025] The housing 60 has a substantially cylindrical shape and is an elongated hollow frame extending along the impact axis TX. The housing 60 has: a top surface 612, which is located on the front side of the housing 60; a back surface 622, which is located on the side opposite to the top surface 612; and a side surface 64, which is located between the top surface 612 and the back surface 622. The side surface 64 is, for example, the part of the outer surface of the housing 60 other than the top surface 612 and the back surface 622. A battery BAT for supplying power to the motor 20 is disposed on the back surface 622. In the present invention, the battery BAT uses a rechargeable battery having a known structure.

[0026] In Figure 2 is shown the impact tool 100 in a state where the battery BAT is removed. As Figure 2 shown, on the back surface 622 of the housing 60, there is provided a battery mounting portion 30 for mounting the battery BAT. The battery mounting portion 30 has a guide rail 32, terminals 34, and side wall portions 36. The side wall portions 36 are wall surfaces extending rearward from the left and right sides and the lower side of the back surface 622. The guide rail 32 is formed in a convex shape along the vertical direction on the inner peripheral surface of the side wall portions 36. The guide rail 32 engages with a concave rail receiving portion (not shown) provided on the battery BAT. The guide rail 32 defines the disassembly and assembly direction DB during the disassembly and assembly of the battery BAT. The battery BAT mounted on the battery mounting portion 30 is electrically connected via the terminals 34 and can supply power to the motor 20 and the like. The battery mounting portion 30 may further have a locking mechanism for restricting the detachment of the battery BAT.

[0027] As Figure 3 shown, inside the housing 60, a motor 20, an impact mechanism 50, and a tool holder 90 are accommodated. The tool holder 90 detachably holds the tip tool TT in an insertion hole 92 provided at the front end portion 61 of the housing 60. The tool holder 90 is accommodated in the front end portion 61. The front end portion 61 includes the top surface 612. The part of the housing 60 in which the motor main body 22 is disposed is also referred to as a "motor accommodation portion 624", and the part in which the impact mechanism 50 is disposed is also referred to as an "impact accommodation portion 63". The part of the housing 60 located on the side opposite to the front end portion 61, including the back surface 622 and the motor accommodation portion 624, is also referred to as the rear end portion 62. In the present embodiment, the motor accommodation portion 624 and the rear end portion 62 coincide with each other.

[0028] In Figure 3In FIG. 0, for ease of explanation, an impact tool 100 is shown in a state where the battery BAT is removed. The disassembly and assembly direction DB of the battery BAT on the battery mounting portion 30 is a direction that intersects the impact axis TX and passes through the handle 70. In the "direction that intersects the impact axis TX and passes through the handle 70", it includes a direction that intersects the impact axis TX and intersects the extending direction of the grip portion 76 described later, i.e., the straight line GD, and a direction that is orthogonal to the impact axis TX and passes through the handle 70 and the impact mechanism 50, DM. In Figure 3 In the example of FIG. 1, the disassembly and assembly direction DB is the same as the up-down direction.

[0029] The user can, for example, remove the battery BAT from the battery mounting portion 30 by sliding the battery BAT upward, i.e., toward the handle 70 side, and pulling it out. In addition, the user can mount the battery BAT on the battery mounting portion 30 by sliding the battery BAT downward along the guide rail 32. Since the disassembly and assembly direction DB of the battery BAT is parallel to the direction toward the handle 70, the user can easily disassemble and assemble the battery BAT with the other hand even when holding the handle 70 with one hand.

[0030] Use Figures 3 to 6 to explain the internal structure of the housing 60. As Figure 3 shown, the motor housing portion 624 in the housing 60 is provided at the rear end portion 62 of the housing 60. The motor 20 is driven by the electric power supplied from the battery BAT mounted on the battery mounting portion 30. In the present embodiment, the motor 20 is, for example, a brushed DC motor. In the impact tool 100 of the present embodiment, there is no controller for driving and controlling the motor 20, making the housing 60 compact. As Figure 3 shown, the motor 20 is disposed at a position where the impact axis TX passes through the motor 20. By disposing the motor rotation axis MX of the motor 20, which is the driving source of the hammer action, relatively close to the impact axis TX of the tip tool TT, the radial dimension of the impact tool 100 can be made compact.

[0031] As Figure 3 shown, the motor 20 has a motor body 22 and a motor shaft 24. The motor body 22 includes a stator and a rotor. The motor body 22 is fixed to the motor housing portion 624 of the rear end portion 62. The motor shaft 24 rotates together with the rotor about the motor rotation axis MX. The motor rotation axis MX is parallel to the impact axis TX on the lower side of the impact axis TX. The front end of the motor shaft 24 projects into the impact housing portion 63. A pinion 541 is provided at the front end of the motor shaft 24. In addition, a fan for cooling the motor body 22 may be provided on the motor shaft 24.

[0032] Use Figures 4 to 6 to explain the details of the impact mechanism 50. As Figure 4As shown, the impact mechanism 50 has an impact portion 52 and a motion conversion portion 54. The motion conversion portion 54 transfers the kinetic energy of the rotational motion of the motor shaft 24 to the impact member 524, and converts the rotational motion of the motor shaft 24 into a linear motion of the impact member 524 along the impact axis TX. The impact portion 52 transfers the kinetic energy of the impact member 524 to the tip tool TT.

[0033] The motion conversion portion 54 has a pinion gear 541, an intermediate gear 542, an intermediate shaft 543, a transmission member 544, and a motion conversion member 546. The pinion gear 541 is provided at the front end of the motor shaft 24 protruding into the impact housing portion 63. The intermediate gear 542 meshes with the pinion gear 541. The intermediate gear 542 is fixed to the rear end of the intermediate shaft 543. As a result, the rotation of the motor shaft 24 is transmitted to the intermediate shaft 543 via the meshing pinion gear 541 and intermediate gear 542.

[0034] The intermediate shaft 543 transfers the kinetic energy transmitted from the motor 20 to the transmission member 544. The intermediate shaft 543 is supported by two bearings so as to be rotatable about the transmission shaft rotation axis SX. The transmission shaft rotation axis SX is parallel to the impact axis TX and the motor rotation axis MX below the motor rotation axis MX. By making the axes parallel and vertically offset, the size of the impact tool 100 in the axial direction, that is, the front-rear direction of the impact tool 100, can be miniaturized.

[0035] The transmission member 544 transfers the rotational motion of the intermediate shaft 543 to the rotating body 546R of the motion conversion member 546. The transmission member 544 is connected to the intermediate shaft 543 and rotates about the transmission shaft rotation axis SX together with the intermediate shaft 543. As described later, the transmission member 544 has a transmission fitting portion 562 that can be fitted to the conversion fitting portion 564 of the motion conversion member 546.

[0036] The motion conversion member 546 is disposed on the intermediate shaft 543, converts the rotational motion of the intermediate shaft 543 into a linear motion, and transmits it to the impact member 524. The motion conversion member 546 includes a rotating body 546R and a swing member 546S. The rotating body 546R is clearance-fitted around the intermediate shaft 543 and is supported by the intermediate shaft 543 so as to be rotatable. The rotating body 546R has a conversion fitting portion 564. By fitting the conversion fitting portion 564 to the transmission fitting portion 562 of the transmission member 544, the rotational motion of the intermediate shaft 543 is transmitted to the rotating body 546R of the motion conversion member 546 via the transmission member 544.

[0037] The swing member 546S is mounted around the rotating body 546R in a manner capable of rotating relative to the rotating body 546R. The swing member 546S has an arm portion 546A extending upward from the rotating body 546R. The swing member 546S swings in the front-rear direction, which is the extending direction of the transmission shaft rotation axis SX, as the rotating body 546R rotates. The arm portion 546A transmits the swing of the swing member 546S to the piston 522.

[0038] The impact portion 52 has a piston 522, an impact member 524, and a bolt 526. The piston 522 is a bottomed cylindrical member. The piston 522 is disposed in the cylinder 520 so as to be slidable along the impact axis TX. The piston 522 is connected to the arm portion 546A of the swing member 546S via a connecting pin and reciprocates in the front-rear direction as the swing member 546S swings.

[0039] The impact member 524 applies an impact force to the tip tool TT. The impact member 524 is disposed in the cylinder 520 so as to be slidable along the impact axis TX. An air chamber SP that functions as an air spring is defined between the bottom surface of the piston 522 and the impact member 524 in the cylinder 520. The bolt 526 is an intermediate member that transmits the kinetic energy of the impact member 524 to the tip tool TT. The bolt 526 is disposed on the front side of the impact member 524 so as to be movable along the impact axis TX.

[0040] When the piston 522 moves in the front-rear direction as the swing member 546S swings, the internal pressure of the air chamber SP changes, and due to the action of the air spring, the impact member 524 slides in the front-rear direction in the cylinder 520. More specifically, when the piston 522 moves forward, the distance between the piston 522 and the impact member 524 decreases. As a result, the air in the air chamber SP is compressed, and the internal pressure in the cylinder 520 rises. The impact member 524 is pushed forward at high speed by the action of the air spring and impacts the bolt 526. The impacted bolt 526 transmits the kinetic energy of the impact member 524 to the tip tool TT. The tip tool TT that has received the kinetic energy is linearly driven along the impact axis TX. The impact tool 100 of the present embodiment can suppress the vibration of the impact tool 100 and transmit a larger kinetic energy to the tip tool TT compared to mechanically transmitting the kinetic energy to the tip tool TT by utilizing the action of the air spring.

[0041] When the piston 522 moves backward, the distance between the piston 522 and the impact member 524 increases, and the air in the air chamber SP expands. As a result, the internal pressure in the cylinder 520 decreases, and the impact member 524 is pulled backward. The impacting tip tool TT contacts the workpiece, and together with the bolt 526, moves backward due to the reaction force from the workpiece. Thereafter, the hammering operation of the impact mechanism 50 is repeated in the same manner.

[0042] AsFigure 4 and Figure 5 As shown in Figure 5 , an anti-dry-fire mechanism 56 is provided in the impact tool 100 according to this embodiment. During the hammering operation, for example, when the tip tool TT is not pressed against the workpiece to be machined, that is, in a no-load state where no load is applied to the tip tool TT, it is preferable that the striker 524 does not strike the bolt 526. When the anti-dry-fire mechanism 56 is in a no-load state, the impact of the striker 524 on the bolt 526 is stopped.

[0043] The anti-dry-fire mechanism 56 includes a transmission fitting portion 562, a conversion fitting portion 564, a biasing member 566, and a connecting portion 568. The biasing member 566 is an elastic body such as a compression spring, for example. The biasing member 566 biases the impact unit UT, which is integrally connected by the front end portion 61 of the tool holder 90, the bolt 526, and the cylinder 520, forward. The connecting portion 568 is a member that connects the impact unit UT and the transmission member 544. The impact unit UT and the transmission member 544 are configured to be able to slide integrally in the front-rear direction through the connecting portion 568.

[0044] In Figure 4 is shown the anti-dry-fire mechanism 56 in a fitted state where the conversion fitting portion 564 is fitted with the transmission fitting portion 562. When the tip tool TT is in a loaded state where it is pressed against the workpiece to be machined by a force stronger than the acting force of the biasing member 566, the impact unit UT and the transmission member 544 are pushed backward. As a result, the conversion fitting portion 564 is fitted with the transmission fitting portion 562, and the anti-dry-fire mechanism 56 is switched to the fitted state.

[0045] In Figure 5 is shown the anti-dry-fire mechanism 56 in a non-fitted state. When the tip tool TT is in a no-load state where the acting force of the biasing member 566 is stronger than the force pressing the tip tool TT, the impact unit UT and the transmission member 544 are biased forward by the biasing member 566. The anti-dry-fire mechanism 56 is switched to a non-fitted state where the conversion fitting portion 564 is separated from the transmission fitting portion 562 and they do not fit with each other. As a result, the rotation of the intermediate shaft 543 is not transmitted to the motion conversion member 546, and the piston 522 does not reciprocate. Therefore, the impact of the striker 524 on the bolt 526 is prevented. Further, as shown in Figure 4 and Figure 5 , when the position of the top surface 612 of the housing 60 in the fitted state is set as the "top position 612B", the position of the top surface 612 of the housing 60 in the non-fitted state is the top position 612F that is closer to the front side than the top position 612B. Figure 4 and Figure 5 As shown in Figure 4 and Figure 5 , when the position of the top surface 612 of the housing 60 in the fitted state is set as the "top position 612B", the position of the top surface 612 of the housing 60 in the non-fitted state is the top position 612F that is closer to the front side than the top position 612B.

[0046] As Figure 4 and Figure 6As shown, a rotation restricting mechanism 58 is provided in the impact tool 100 according to the present embodiment. The blade of the tip tool TT is generally used for excavation work. When the tip tool TT rotates about the impact axis TX during excavation work, the working efficiency of the impact tool 100 may decrease. The rotation restricting mechanism 58 restricts the tool holder 90 or the tip tool TT from rotating about the impact axis TX relative to the housing 60. With such a configuration, breakage of the tip tool TT due to rotation about the impact axis TX can be suppressed or prevented.

[0047] The rotation restricting mechanism 58 has a rail portion 582 and a groove portion 584. The rail portion 582 is a member provided on the outer periphery of the cylinder 520 and protruding outward from the cylinder 520. The rail portion 582 has a substantially flat plate shape elongated in the front-rear direction. The groove portion 584 is a concave portion provided on the inner peripheral surface of the housing 60 and elongated in the front-rear direction. The groove portion 584 has a shape corresponding to the rail portion 582, and the rail portion 582 is fitted into the groove portion 584. The length of the groove portion 584 in the front-rear direction is longer than the length of the rail portion 582 in the front-rear direction. As a result, the rail portion 582 can slide in the groove portion 584 in the front-rear direction. In addition, the length of the groove portion 584 in the front-rear direction is formed by a distance equal to or greater than the distance from the above-mentioned top position 612B to the top position 612F. With such a configuration, the impact unit UT can slide from the top position 612B to the top position 612F in the front-rear direction while being guided by the rail portion 582 and the groove portion 584.

[0048] As Figure 6 shown, the cross-sectional width of the groove portion 584 is substantially the same as the cross-sectional width of the rail portion 582. With such a structure, rotation of the impact unit UT relative to the housing 60 can be suppressed or prevented. That is, rotation of the tip tool TT relative to the housing 60 about the impact axis TX can be suppressed. In addition, as Figure 6 shown, in the present embodiment, an example in which nine rail portions 582 and groove portions 584 are respectively provided is shown, but the rail portion 582 and the groove portion 584 may be one, or any number of two or more.

[0049] Use Figure 7 and Figure 8 to illustrate the structure of the handle 70. As Figure 7 shown, the handle 70 has a rear connecting portion 74, a front connecting portion 72, and a gripping portion 76 that connects the front connecting portion 72 and the rear connecting portion 74.

[0050] The rear connecting portion 74 is a part of the handle 70 that is connected to the rear end portion 62 of the housing 60. In the present embodiment, the rear end 70B of the rear connecting portion 74 is substantially coplanar with the back surface 622 of the housing 60. In Figure 7In the example, the rear end of the handle 70 is the rear end of the housing 60 and is substantially aligned with the rear end of the motor housing portion 624. Further, in Figure 7 In the example, the side wall portion 36 of the battery mounting portion 30 is not considered as part of the housing 60, but it can also be considered as part of the housing 60. In this case, for example, the top 36T of the side wall portion 36 is configured to be coplanar with the rear end 70B of the rear connection portion 74. Further, the rear connection portion 74 only needs to be connected to the rear end portion 62 of the housing 60. The rear connection portion 74 can be connected between the battery mounting portion 30 and the motor housing portion 624 or between the back surface 622 and the motor housing portion 624 in the rear end portion 62. For example, the rear end 70B of the rear connection portion 74 may not be coplanar with the back surface 622 or the top 36T, or may be disposed near the back surface 622 or the top 36T.

[0051] The front connection portion 72 is the portion of the handle 70 that is connected to the side surface 64 of the housing 60. Specifically, the front connection portion 72 is connected to the front side of the side surface 64 along the impact axis TX with respect to the rear connection portion 74. In Figure 7 In the example, the front connection portion 72 is connected near the front end of the impact housing portion 63. Specifically, the front end 70F of the front connection portion 72 is located near the boundary between the front end portion 61 and the impact housing portion 63.

[0052] Thus, in the impact tool 100 of the present embodiment, the handle 70 has a substantially L-shaped configuration. The rear end of the handle 70 is disposed at the rear end portion 62 of the housing 60, and the front end of the handle 70 is disposed at the side surface 64 on the front side of the housing 60. That is, by disposing the substantially L-shaped handle 70 on the upper side of the housing 60, the handle 70 and the housing 60 form an annular outer shape. By forming the handle 70 and the housing 60 in an annular shape, an impact tool 100 can be provided that has improved strength, is easy for the user to hold the handle 70, and has appropriate operability for the user. Further, by connecting the rear end of the handle 70 to the rear end portion 62 of the housing 60 and connecting the front end of the handle 70 near the front end portion 61 of the housing 60, it is easy to obtain the balance of the impact tool 100 when holding the handle 70. Further, "the rear end of the handle 70 is disposed at the rear end portion 62 of the housing 60" means including the case where at least one end of the handle separately formed with respect to the housing 60 is connected to the rear end portion 62 of the housing 60 and the case where the rear end portion 62 of the housing 60 is substantially the same as the rear end of the handle 70 by integrally forming the housing 60 and the handle 70.

[0053] The handle 70 is provided with a light-emitting portion 80 capable of emitting light. The light-emitting portion 80 is, for example, an LED illumination powered by a battery BAT. The light-emitting portion 80 is configured to be able to irradiate light to the tip tool TT and the work area including the object to be processed or its surroundings. By having the light-emitting portion 80, the visual confirmation of the work area of the impact tool 100 can be improved. In the present embodiment, the light-emitting portion 80 is provided on the front surface of the front connection portion 72 in the handle 70. Therefore, according to the impact tool 100 of the present embodiment, the illuminance near the tip tool TT or the object to be processed can be further improved.

[0054] The grip portion 76 is a substantially cylindrical elongated member and is the portion gripped by the user. As Figure 7 shown, the grip portion 76 has a grip facing portion 76F and a grip back portion 76B on the side opposite to the grip facing portion 76F. The grip facing portion 76F is the portion of the grip portion 76 facing the housing 60. In Figure 7 the example, the grip facing portion 76F is the set of the tops of the outer surface of the grip portion 76 closest to the housing 60. The grip back portion 76B is the set of the tops of the outer surface of the grip portion 76 on the side opposite to the grip facing portion 76F. In addition, when the cross-section of the grip portion 76 is polygonal or the like and the grip portion 76 has a facing surface facing the housing 60, the grip facing portion 76F can be defined using this facing surface, and the grip back portion 76B can be defined using the surface on the side opposite to this facing surface.

[0055] A trigger 77 is provided on the grip facing portion 76F of the grip portion 76. The trigger 77 is a so-called momentary type switch. In response to the pressing operation of the trigger 77 performed by the user, the switch 78 (refer to Figure 3 ) becomes in an on state. When the switch 78 becomes in an on state, power is supplied from the battery BAT to the motor 20 to drive the motor 20.

[0056] Use Figure 7 to illustrate the configuration structure of the handle 70 in the front-rear direction. The grip portion 76 is arranged to be inclined with respect to the housing 60. Here, one end of the grip portion 76 close to the top end surface 612 of the housing 60 is defined as the front end 76BF, and the shortest distance from the front end 76BF to the side surface 64 of the housing 60 is defined as the front side distance HT1. The "front end 76BF of the grip portion 76" can be defined, for example, using the position in the grip back portion 76B closest to the top end surface 612 of the housing 60, or the vicinity of the front connection portion 72 in the grip back portion 76B, that is, the vertex farthest from the housing 60.

[0057] One end of the holding part 76 close to the back surface 622 of the housing 60 is defined as the rear end 76BB of the holding part 76, and the shortest distance from the rear end 76BB to the side surface 64 of the housing 60 is defined as the rear side distance HT2. The "rear end 76BB of the holding part 76" can be defined, for example, by using the position on the holding back 76B closest to the back surface 622 of the housing 60, or the vicinity of the rear connecting part 74 on the holding back 76B, that is, the vertex farthest from the housing 60.

[0058] As Figure 7 shown, the holding part 76 is configured such that the front side distance HT1 is longer than the rear side distance HT2. In other words, the holding part 76 is inclined with respect to the housing 60 such that the front side of the holding part 76 is farther from the housing 60 than the rear side of the holding part 76. By tilting the handle 70 in this way, it is easy for the user to lift the impact tool 100, and it is also easy to push the holding part 76 forward or in the direction toward the tip tool TT. Therefore, it is possible to provide an impact tool 100 with high workability that can easily push the tip tool TT forward while holding the handle 70. In addition, the "extension direction of the holding part 76" can be defined, for example, by a straight line GD passing through the front end 76BF and the rear end 76BB.

[0059] As Figure 7 shown, the length of the housing 60 in the front-rear direction is set as the length L1, and the length of the holding part 76 in the front-rear direction along the impact axis TX is set as the length L2. At this time, in the present embodiment, the length L2 of the holding part 76 is configured to be about 72% of the length L1 of the housing 60. By setting the length L2 of the holding part 76 to be more than one-half of the length L1 of the housing 60, it is easy for the user to obtain balance, and it is possible to provide an impact tool 100 with good operability for the user. In addition, the length L1 of the housing 60 is about 230 mm, which is set smaller than that of a general impact tool.

[0060] The "length L1 of the housing 60" can be defined, for example, by the straight line distance from the back surface 622 to the top surface 612. The length L1 of the housing 60 can be defined by the straight line distance from the rear end 76BB or the top 36T of the battery mounting part 30 to the top surface 612 instead of the back surface 622. The "length L2 of the holding part 76 in the front-rear direction along the impact axis TX" can be defined, for example, by the straight line distance in the front-rear direction of the holding part 76 starting from the rear end 76BB along the impact axis TX. The length L2 can start from the back surface 622 instead of the rear end 76BB. In addition, from the viewpoint of improving the operability of the impact tool 100, the length L2 is preferably more than one-half of the length L1. In this case, the length L2 can be, for example, 60% or more, 70% or more, 75% or more, 80% or more, or 90% or more of the length L1, or can also be more than two-thirds.

[0061] UseFigure 8 to illustrate the configuration of the handle 70 in a top-down view. In Figure 8 , a top view of the impact tool 100 observed from above is shown. Specifically, a state of the impact tool 100 observed from above in a direction orthogonal to the motor rotation axis MX and the impact axis TX, that is, in the direction DM passing through the handle 70 and the impact mechanism 50 (refer to Figure 3 ) is shown. In addition, in the example of Figure 3 , the direction DM is the same as the up-down direction.

[0062] In Figure 8 , the overlapping area AR between the handle 70 and the impact mechanism 50 is indicated by cross-hatching. As shown in Figure 8 , in the impact tool 100 of the present embodiment, a part of the handle 70, specifically, a part of the grip portion 76, is configured to overlap at least a part of the impact mechanism 50. That is, the impact tool 100 of the present embodiment is configured such that the grip portion 76 is disposed directly above the impact mechanism 50. By disposing the handle 70 above the impact mechanism 50, which is likely to have a large weight in the structure within the housing 60, the user can easily obtain balance, and an impact tool 100 with good operability for the user can be provided.

[0063] In addition, in the impact tool 100 of the present embodiment, the handle 70 is disposed on the side opposite to the motion conversion portion 54 with respect to the impact axis TX (refer to Figure 3 ). The handle 70 is disposed on the upper side of the housing 60, the motion conversion portion 54 is disposed on the lower side within the housing 60, and the impact axis TX is disposed between the motion conversion portion 54 and the handle 70. By disposing the handle 70 near the impact axis TX, the operability of the impact tool 100 when the user performs a hammering action can be improved. In addition, since the handle 70, the impact axis TX, and the motion conversion portion 54 are arranged in the vertical direction, and the motion conversion portion 54, which is likely to have a large weight in the impact mechanism 50, is disposed on the lower side within the housing 60, the user can easily obtain balance, and an impact tool 100 with good operability for the user can be provided.

[0064] As described above, according to the impact tool 100 of the present embodiment, it has an impact mechanism 50 using an air spring and a handle 70 for the user to hold. The rear end of the handle 70 is disposed at the rear end portion 62 of the housing 60. By using the impact mechanism 50 with an air spring, compared with an impact mechanism that mechanically transmits kinetic energy, the vibration of the impact tool 100 can be suppressed, and a large amount of kinetic energy can be transmitted to the tip tool TT. In addition, by disposing the handle 70 at the rear end of the housing 60, the user can easily hold the handle 70 and apply a force to push the tip tool TT along the impact axis TX toward the processing object, and an impact tool 100 with a high impact force generated by the tip tool TT can be provided.

[0065] In the impact tool 100 according to the present embodiment, the motor housing portion 624 is provided at the rear end portion 62 of the housing 60. By disposing the motor 20 at the rear end portion 62 of the housing 60, it is possible to reduce the size of the housing 60 in the radial direction that intersects the impact axis TX.

[0066] In the impact tool 100 according to the present embodiment, a battery mounting portion 30 is further provided on the back surface 622 of the housing 60, and the battery mounting portion 30 can detachably mount the battery BAT. Compared with the case where the battery mounting portion 30 is provided on the side surface 64 of the housing 60, the size of the housing 60 in the radial direction can be reduced. Therefore, it is easy to bring the housing 60 close to a processing object such as the ground, and an impact tool 100 suitable for excavation work or the like can be provided.

[0067] In the impact tool 100 according to the present embodiment, the motor 20 is arranged such that the impact axis TX passes through the motor 20. Therefore, the size of the housing 60 in the radial direction can be reduced.

[0068] In the impact tool 100 according to the present embodiment, the handle 70 is connected to the side surface 64 of the housing 60 and is arranged on the side opposite to the motion conversion portion 54 with respect to the impact axis TX. By arranging the handle 70 near the impact axis TX, in a peeling operation or an excavation operation or the like, the user can easily perform the action of pushing the tip tool TT against the processing object. In addition, by arranging the handle 70, the impact axis TX, and the motion conversion portion 54 in the vertical direction, and arranging the motion conversion portion 54, in which the weight in the impact mechanism 50 tends to be large, on the lower side inside the housing 60, the user can easily obtain balance, and an impact tool 100 with good operability for the user can be provided.

[0069] In the impact tool 100 according to the present embodiment, the handle 70 has: a rear connection portion 74 connected to the rear end portion 62 of the housing 60; a front connection portion 72 connected to the side surface 64 of the housing 60; and a grip portion 76 connecting the rear connection portion 74 and the front connection portion 72. By forming the handle 70 and the housing 60 in a ring shape, an impact tool 100 with good operability for the user can be provided.

[0070] In the impact tool 100 according to the present embodiment, in a plan view of observing the impact tool 100 in the direction DM perpendicular to the motor rotation axis MX, that is, in the direction DM passing through the handle 70 and the impact mechanism 50, at least a part of the grip portion 76 overlaps at least a part of the impact mechanism 50. By arranging the handle 70 directly above the impact mechanism 50 where the weight tends to be large, the user can easily obtain balance, and an impact tool 100 with good operability for the user can be provided.

[0071] In the impact tool 100 according to the present embodiment, the gripping portion 76 is inclined with respect to the impact axis TX such that it moves away from the impact axis TX as it goes from the rear end portion 62 to the top end surface 612. Therefore, an impact tool 100 can be provided that is easy to lift and whose top tool TT can be easily advanced forward by operating the handle 70.

[0072] In the impact tool 100 according to the present embodiment, the length of the gripping portion 76 in the front-back direction along the impact axis TX is more than half of the length of the housing 60 from the back surface 622 to the top end surface 612. By making the length L2 of the gripping portion 76 and the length L1 of the housing 60 of the same degree, it is easy for the user to obtain balance, and an impact tool 100 with good operability for the user can be provided.

[0073] The impact tool 100 of the present embodiment further has a battery mounting portion 30 on the back surface 622, and the battery mounting portion 30 can detachably mount the battery BAT. The detachment and attachment direction DB of the battery BAT in the battery mounting portion 30 is orthogonal to the impact axis TX and intersects the extending direction GD of the gripping portion 76. Even when the user holds the handle 70 with one hand, the user can easily detach and attach the battery BAT with the other hand.

[0074] The impact tool 100 of the present embodiment further has a light emitting portion 80 that can irradiate light. By the light emitting portion 80, the top tool TT, the processing object, or its surroundings can be illuminated, and the visual confirmation of the working area of the impact tool 100 can be improved.

[0075] B. Second Embodiment: Use Figure 9 And Figure 10 to illustrate the structure of the impact tool 100b according to the second embodiment. As Figure 9 shown, the difference between the impact tool 100b according to the present embodiment and the impact tool 100 according to the first embodiment is that it has a housing 60b instead of the housing 60, a handle 70b instead of the handle 70, a motor 20b instead of the motor 20, and also has a controller 40. Other than that, the structures are the same.

[0076] The impact tool 100b of the present embodiment is used, for example, for the peeling operation of a processing object. The top tool TT uses a scraper (not shown) instead of a spatula. The scraper is a tool for performing a peeling operation on a processing object. The top tool TT can be a so-called spatula.

[0077] The motor 20b is a brushless DC motor whose rotational speed is controlled by the controller 40. The controller 40 is constituted by a computer having a CPU as a processor and a memory such as RAM or ROM. The controller 40 is configured to control various operations of the impact tool 100 such as the drive control of the motor 20b. The controller 40 is disposed at a position on the rear side of the motor housing portion 624 in the rear end portion 62. Specifically, the controller 40 is disposed between the back surface 622 and the motor housing portion 624. In other words, the controller 40 is disposed between the battery mounting portion 30 and the motor 20b. By configuring in this way, the size in the radial direction of the housing 60b is reduced.

[0078] The shape of the handle 70b is different from that of the handle 70 shown in the first embodiment. In the above first embodiment, an example in which the shapes of the handle 70 and the housing 60 are annular is shown. In contrast, in the present embodiment, the handle 70b extends in a substantially straight line so as to face away from the housing 60b. The shape of the handle 70b is sometimes referred to as a "cantilever handle".

[0079] The handle 70b has a connecting portion 74b and a gripping portion 76b connected to the connecting portion 74b. The connecting portion 74b is a portion connected to the rear end portion 62 of the housing 60b. That is, one end of the handle 70b is connected to the rear end portion 62 of the housing 60b in the same manner as the handle 70 shown in the first embodiment. In the handle 70b, one end of the gripping portion 76b is connected to the rear end portion 62 of the housing 60b via the connecting portion 74b. The front end of the gripping portion 76b is a so-called free end disposed at a position away from the housing 60b and is not connected to the housing 60b. The front end of the gripping portion 76b is also referred to as the "tip 76T".

[0080] The rear end 70B of the connecting portion 74b is disposed on the rear side of the motor housing portion 624 and on the rear side of the controller 40. In Figure 9 the example, the rear end 70B is substantially coplanar with the back surface 622 of the housing 60b, and the rear end of the handle 70b substantially coincides with the rear end of the housing 60b. In addition, similar to the handle 70 shown in the first embodiment, the handle 70b is disposed on the opposite side of the motion conversion portion 54 across the impact axis TX. That is, the handle 70b is connected to the rear end portion 62 of the housing 60b, that is, the side surface 64 above the motor housing portion 624 or the impact housing portion 63. By disposing the handle 70b above the impact axis TX, it is easy to push the rear side of the handle 70b forward while gripping the handle 70b. Therefore, it is easy for the user to perform an operation of pushing the tip tool TT such as a peeling operation or a digging operation toward the processing object.

[0081] The gripping portion 76b is a long, substantially cylindrical member and is the part gripped by the user. A trigger 77 having the same structure as the trigger 77 shown in the first embodiment is provided on the front side of the gripping portion 76b.

[0082] As Figure 9 shown, the extending direction HD in which the gripping portion 76b extends is a direction intersecting the impact axis TX and is substantially linear. The extending direction HD is an example of "the extending direction of the gripping portion 76". It is linearly formed in a direction away from the housing 60b by the handle 70b, and it is easy for the user to push the rear side of the handle 70b forward while gripping the handle 70b, and it is easy to perform the action of pushing the tip tool TT against the processing object. Therefore, an impact tool 100b suitable for peeling operations can be provided.

[0083] The "extending direction HD" can be defined, for example, by a straight line connecting the midpoint 74CP between the front end 74F of the connecting portion 74b and the rear end 70B which is the rear end 70B of the connecting portion 74b and the apex 76UP of the gripping portion 76b. The apex 76UP is the portion in the tip 76T where the shortest distance from the tip 76T to the side surface 64 of the housing 60b is the longest.

[0084] The extending direction HD is configured such that the direction component in the vertical direction orthogonal to the impact axis TX is larger than the direction component in the front-rear direction along the impact axis TX. That is, the extending direction HD is configured such that the angle θ1 between it and the impact axis TX is 45 degrees or more. In the present embodiment, the angle θ1 is configured to be approximately 75 degrees, and the extending direction HD is a direction slightly inclined forward with respect to the vertical direction. However, the angle θ1 is not limited to 75 degrees and can be set to any angle of 45 degrees or more and less than 90 degrees, such as 45 degrees, 60 degrees, 75 degrees, etc. In such a configuration, it is also easy for the user to push the rear side of the handle 70b forward while gripping the handle 70b, and an impact tool 100b suitable for peeling operations can be provided. In addition, the extending direction HD may not be inclined forward with respect to the vertical direction, and the angle θ1 may be set to 90 degrees and configured to be perpendicular to the housing 60b.

[0085] The extending direction HD is not limited to the example using the apex 76UP and the midpoint 74CP, and can be defined by a straight line connecting the front end 74F and the apex 76UP, or can be defined by a straight line connecting the rear end 70B and the apex 76UP. The extending direction HD can be defined by a straight line connecting the midpoint of the tip 76T and any one of the front end 74F, the midpoint 74CP, and the rear end 70B. The midpoint 74CP can be defined by the center or the centroid of the connection surface between the connecting portion 74b and the handle 70b.

[0086] In the impact tool 100b of the present embodiment, a protrusion 79 is provided at the tip 76T of the grip portion 76b. The protrusion 79 is a substantially plate-shaped structure that protrudes forward from the grip portion 76b. The protruding direction FD of the protrusion 79 is a direction that intersects the extending direction HD and faces forward from the extending direction HD. In the present embodiment, the protruding direction FD is substantially orthogonal to the extending direction HD. In Figure 9 the example of, the front end 76TF of the tip 76T, which is the other end of the grip portion 76b, is located further forward than the front end 74F of the connecting portion 74b. A light-emitting portion 80 is provided at the front end 76TF of the protrusion 79. By providing the light-emitting portion 80 at the front end 76TF, the illuminance near the tip tool TT or the object to be processed can be further increased. In addition, the protruding direction FD is not limited to the case where it is orthogonal to the extending direction HD, and may intersect the extending direction HD at any angle. In addition, the light-emitting portion 80 can also be omitted.

[0087] The protrusion 79 protrudes forward by a predetermined distance further than the surface of the trigger 77 in the protruding direction FD. That is, the front end 76TF is disposed at a position further forward than the surface of the trigger 77. When operating the impact tool 100b while gripping the grip portion 76b, for example, for the on / off operation of the trigger 77, it can be assumed that the impact tool 100b is operated in a state where a finger FG of one hand, such as an index finger, is in contact with the trigger 77. Since the protrusion 79 is located above the user's finger FG in the vertical direction, the user can support the bottom 79B of the protrusion 79 with the finger FG. Therefore, an impact tool 100b having a linear handle 70b and good operability for the user can be provided. In addition, the impact tool 100b can be easily lifted, and when the tip tool TT is a spade, the operability of the impact tool 100 in the operation of digging the ground can be improved.

[0088] In addition, when the impact tool 100b has an electronic switch instead of the trigger 77, it is preferable that the electronic switch is disposed on the tip 76T of the grip portion 76b. With such a structure, when the user grips the handle 70b and operates the impact tool 100b, for example, the electronic switch on the tip 76T can be appropriately operated by using the thumb.

[0089] As Figure 9As shown, the difference between the housing 60b and the housing 60 shown in the first embodiment is that it has an anti-slip portion 68. Inside the housing 60b, a motor 20b, an impact mechanism 50, a tool holder 90, etc. are housed by the same structure as the housing 60. In addition, a battery mounting portion 30 for mounting the battery BAT is provided on the back surface 622 of the housing 60b in the same manner as the housing 60. The disassembly and assembly direction DB2 of the battery BAT in the battery mounting portion 30 is a direction that intersects the impact axis TX and is slightly inclined backward with respect to the vertical direction. In addition, the disassembly and assembly direction DB2 intersects the extending direction HD of the grip portion 76b. That is, the disassembly and assembly direction DB2 is a direction included in the plane defined by the impact axis TX and the extending direction HD. Therefore, even when the user holds the handle 70b with one hand, the user can easily disassemble and assemble the battery BAT with the other hand. In addition, the disassembly and assembly direction DB2 is included in "a direction that intersects the impact axis TX and passes through the handle 70".

[0090] The anti-slip portion 68 is provided on the side surface 64 of the housing 60b. More specifically, the anti-slip portion 68 is provided at a position on the side surface 64 of the housing 60b that is closer to the front side than the center position in the front-rear direction of the housing 60b and closer to the front side than the center position in the front-rear direction of the impact housing portion 63. The anti-slip portion 68 is a protrusion that protrudes outward from the side surface 64.

[0091] As Figure 10 shown, the anti-slip portion 68 is formed in a substantially circular ring shape and is continuously provided around the side surface 64 with the impact axis TX as the center. In Figure 10 , for ease of understanding, hatching is provided on the anti-slip portion 68. The anti-slip portion 68 is integrally formed with the housing 60b, for example, by mold molding using synthetic resin. However, it is not limited thereto, and the anti-slip portion 68 may be formed by installing a separate component such as an elastic member on the side surface 64.

[0092] Here, in the impact tool 100b of the present embodiment, the handle 70b is linear and the other end of the handle 70b is not connected to the front side of the housing 60b. Therefore, it can be assumed that the user can easily hold the front side of the side surface 64 of the housing 60b with the other hand and operate the impact tool 100b while holding it with both hands. When the user operates the impact tool 100b to press the tip tool TT against a processing object such as the ground, it is assumed that the user applies force to the handle 70b with one hand and uses the frictional force with the side surface 64 with the other hand to perform a pressing action that applies a force toward the front side to the housing 60b.

[0093] In the impact tool 100b of the present embodiment, an anti-slip portion 68 is provided on the front side of the side surface 64. When performing a pushing action, the user can hook the fingers of the other hand on the anti-slip portion 68. Therefore, the user can easily apply the force for pushing the impact tool 100b forward to the rear side of the anti-slip portion 68 by using the fingers of the other hand, and thus can easily perform this pushing action. In addition, it is possible to suppress or prevent the user's hand from slipping forward to the front side of the housing 60b during the operation of the impact tool 100b. Further, the arrangement position of the anti-slip portion 68 is preferably arranged at a position on the side surface 64 that is easy for the user to hold.

[0094] As described above, in the impact tool 100b according to the present embodiment, the handle 70b is connected to the side surface 64 of the housing 60b and is arranged on the side opposite to the motion conversion portion 54 across the impact axis TX. By arranging the handle 70b near the impact axis TX, the user can easily perform the action of pushing the tip tool TT against the processing object during a peeling operation or an excavation operation or the like. In addition, by arranging the handle 70b, the impact axis TX, and the motion conversion portion 54 in the vertical direction, and arranging the motion conversion portion 54, in which the weight in the impact mechanism 50 easily becomes large, on the lower side inside the housing 60b, the user can easily obtain balance, and an impact tool 100b with good operability for the user can be provided.

[0095] In the impact tool 100b according to the present embodiment, the handle 70b has: a connecting portion 74b that connects one end of the handle 70b to the rear end portion 62; and a gripping portion 76b that extends linearly from the connecting portion 74b in an extending direction HD that intersects the impact axis TX. By linearly forming the handle 70b in a direction away from the housing 60b, the user can easily push the handle 70b from the rear side while gripping the handle 70b, and can easily perform the action of pushing the tip tool TT forward toward the processing object. Therefore, an impact tool 100b that is easy for the user to push against the processing object and has high workability can be provided.

[0096] In the impact tool 100b according to the present embodiment, the gripping portion 76b has a protruding portion 79 that protrudes from the gripping portion 76b in a protruding direction FD that intersects the extending direction HD. The user can support the protruding portion 79 with a finger FG or the like while gripping the gripping portion 76b. Therefore, an impact tool 100b that has a linear handle 70b and good operability for the user can be provided.

[0097] C. Third Embodiment: Use Figure 11 to illustrate the structure of the impact tool 100c according to the third embodiment. As Figure 11As shown, the impact tool 100c according to the present embodiment is different from the impact tool 100 according to the first embodiment in that it has a housing 60c instead of the housing 60, a handle 70c instead of the handle 70, and a switch 77c instead of the trigger 77, and the other structures are the same. In addition, the tip tool TT is a spatula configured in the same manner as in the first embodiment.

[0098] The switch 77c is a button for switching the on / off of the power supply to the motor 20. The switch 77c is provided on the side surface 64 of the housing 60c. In the present embodiment, the switch 77c is the rear end portion 62 in the side surface 64 and is provided near the handle 70c. By arranging the switch 77c near the handle 70c, the user can easily operate the switch 77c while holding the handle 70c. In addition, the switch 77c can be any type of switch. The switch 77c can be, for example, an instantaneous type or an alternating type button, or an electrostatic type or a diaphragm type switch, etc.

[0099] The difference between the housing 60c and the housing 60 is that it has a recess 64R. The recess 64R is a portion of the housing 60c where the cross-sectional area is smaller than other portions. In the present embodiment, the entire recess 64R provided on the side surface 64 of the housing 60c functions as the handle 70c. That is, in the impact tool 100c of the present embodiment, the handle 70c is not extended from the housing 60 but is integrally provided with the housing 60. The front surface 64RS of the front end of the recess 64R is inclined so as to be easily hooked by the fingers when the user holds the handle 70c. Therefore, it is possible to suppress or prevent the user's hand from slipping forward to the housing 60c during the operation of the impact tool 100c. Preferably, the width of the cross-section of the recess 64R is a length that is easily holdable by the user.

[0100] The recess 64R is formed at the rear end portion 62 of the housing 60c. That is, in the impact tool 100c of the present embodiment, the rear end of the handle 70c is also arranged at the rear end portion 62 of the housing 60c. Therefore, the user can easily perform the action of holding the handle 70c and pushing the tip tool TT toward the processing object, and an impact tool 100c with high workability can be provided.

[0101] In addition, in the case where the housing 60c does not have the recess 64R, on the premise that the user can hold the housing 60c, any position of the housing 60c except the front end portion 61 can function as the handle 70c. In this case, the rear end of the handle 70c is arranged at the rear end portion 62 of the housing 60c and coincides with the rear end of the housing 60c. In addition, the front end of the handle 70c is arranged at the front end portion 61 of the housing 60c and coincides with the front end of the housing 60c. The user operates the impact tool 100c, for example, while holding any position of the housing 60c with two hands or one hand.

[0102] D. Other embodiments: (D1) In each of the above embodiments, as an example of the tip tool TT, the impact tools 100 and 100b having a spade were described. In contrast, as the tip tool TT, tools other than a spade may be used. The spade may or may not have a footrest portion.

[0103] (D2) In each of the above embodiments, the structure in which the motion conversion member 546 includes the rotating body 546R and the swing member 546S was described. In contrast, the motion conversion member 546 may be configured to use a so-called crank mechanism. The motion conversion member 546 having a crank mechanism has, for example, a crankshaft and a connecting rod. The crankshaft receives the rotation of the pinion 541 that is connected to the motor shaft 24 and rotates, for example, about a rotation axis perpendicular to the motor rotation axis MX. The connecting rod connects the piston 522 and the crank pin provided on the crankshaft. When the motor shaft 24 rotates by driving of the motor 20, the crankshaft rotates, and the crank pin rotates about the rotation axis of the crankshaft. The piston 522 reciprocates in the front-rear direction via the connecting rod that swings by the rotation of the crank pin. The impact tool 100 having such a structure also achieves the same effects as those of the above embodiments.

[0104] (D3) Moreover, in view of the gist of the present invention and the above embodiments, the following modes are constructed. The following modes can be used in combination with the impact tools 100, 100b, 100c shown in the embodiments and the inventions described in the above modifications or each technical solution. [Mode 1] The rear end of the handle is coplanar with the back surface. [Mode 2] The rear end of the handle coincides with the end of the housing. [Mode 3] The rear end of the handle is continuously formed with the back surface. [Mode 4] The rear end of the handle is connected to at least a part of the battery mounting portion. [Mode 5] The front end of the handle is disposed near the front end portion. [Mode 6] The impact tool has a convex anti-slip portion protruding outward from the side surface of the housing on the side surface of the housing. [Mode 7] The anti-slip portion is disposed near the front end portion. [Mode 8] The light emitting portion is provided at the front connecting portion. [Mode 9] The angle between the extension direction and the impact axis is more than 45 degrees and less than 90 degrees. [Mode 10] The handle is integrated with the housing.

Claims

1. An impact tool, characterized in that: It has a motor, an impact mechanism, a housing and a handle, wherein: The motor has a motor shaft that rotates around a motor rotation axis; The impact mechanism includes a cylinder and an impact piece adjacent to an air chamber defined in the interior of the cylinder, and utilizes an air spring of the air chamber to convert the rotational motion of the motor shaft into a linear motion of the impact piece along a predetermined impact axis; The housing has: a front end portion including a top end surface for mounting a top tool; and a rear end portion including a back surface opposite to the top end surface, and the housing is used to accommodate the motor and the impact mechanism; The handle is configured to be held by a user. The motor rotation axis and the impact axis are parallel to each other, The rear end of the handle is disposed at the rear end portion.

2. The impact tool according to claim 1, characterized in that A motor housing portion for housing the motor is provided at the rear end portion.

3. The impact tool according to claim 1 or 2, characterized in that: The motor further comprises a battery mounting portion, the battery mounting portion being capable of detachably mounting a battery for supplying electric power for driving the motor to the motor, The impact axis passes through the battery mounting portion.

4. The impact tool according to any one of claims 1 to 3, characterized in that: The impact axis passes through the motor.

5. The impact tool according to any one of claims 1 to 4, characterized in that The impact mechanism has a motion conversion portion that converts the rotational motion of the motor shaft into a linear motion of the impact member. The handle is connected to the side of the housing, and The handle is arranged on the opposite side of the motion conversion portion across the impact axis.

6. The impact tool according to any one of claims 1 to 5, characterized in that In a direction orthogonal to the motor rotation axis and in a top view of the impact tool along a direction passing through the handle and the impact mechanism, At least a portion of the handle overlaps at least a portion of the impact mechanism.

7. The impact tool according to any one of claims 1 to 6, characterized in that The handle comprises a rear connecting portion, a front connecting portion and a gripping portion, wherein: The rear connecting portion connects the rear end of the handle to the rear end portion; The front connecting portion connects the front end of the handle to the side of the housing; The holding portion connects the rear connecting portion and the front connecting portion.

8. The impact tool according to claim 7, characterized in that The grip portion is inclined with respect to the striking axis so as to be away from the striking axis as it moves from the rear end portion toward the front end surface.

9. The impact tool according to claim 7 or 8, characterized in that: The length of the grip portion along the striking axis is equal to or greater than one-half of the length of the housing from the back surface to the top surface.

10. The impact tool according to any one of claims 1 to 5, characterized in that: The handle has a connecting portion and a holding portion, wherein: The connecting portion connects the rear end of the handle to the rear end portion; The holding portion extends from the connecting portion along an extending direction intersecting the impact axis. The extending direction is configured such that a directional component of a direction orthogonal to the impact axis is larger than a directional component of a direction along the impact axis.

11. The impact tool according to claim 10, characterized in that The front end of the handle is separated from the housing. The holding portion has a protruding portion that protrudes from the holding portion in a protruding direction that intersects the extending direction.

12. The impact tool according to claim 5, characterized in that The rear end portion further includes a battery mounting portion, the battery mounting portion being capable of detachably mounting a battery for supplying electric power for driving the motor to the motor. The direction of installing and removing the battery from the battery installation portion is a direction that intersects the impact axis and passes through the handle.

13. The impact tool according to any one of claims 1 to 12, characterized in that The device further includes a light emitting unit capable of irradiating light to the working area.

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