CN116533187A - Impact tool - Google Patents

Abstract

The invention provides an impact tool. The impact tool comprises a 1 st shell, a motor, a 2 nd shell and a controller, wherein the motor is accommodated in the 1 st shell; the 2 nd housing covers at least a portion of the 1 st housing; the controller is accommodated in the 2 nd housing. The 2 nd housing is connected to the 1 st housing by at least 1 elastic member in such a manner as to be movable in the 1 st direction parallel to the drive axis with respect to the 1 st housing. The 2 nd housing has at least 1 opening for wiring, the at least 1 opening communicating the inside with the outside of the 2 nd housing. At least 1 wire extending from the controller extends through at least 1 opening of the 2 nd housing to the outside of the 2 nd housing.

Description

Impact tool

Technical Field

The present invention relates to an impact tool (impact tools) configured to linearly drive a tip tool.

Background

The impact tool drives the tip tool linearly along the drive axis by intermittently impacting one end of the tip tool to perform a machining operation (e.g., a chipping operation) on a workpiece. In the impact tool, therefore, particularly large vibrations are generated in the extending direction of the drive axis along with the driving of the motor (motorr). Accordingly, various impact tools having a vibration isolation structure for reducing transmission of vibration to the grip portion are known. For example, an impact tool disclosed in Japanese patent laid-open publication No. 2016-165783 has: a driving unit housing accommodating the driving unit; and a head housing elastically supported by the drive unit housing and integrated with the handle.

Disclosure of Invention

The impact tool having the above structure can effectively reduce transmission of vibration from the drive section casing to the handle. On the other hand, an impact tool having such a vibration-proof structure includes at least 2 parts that move relatively, and therefore wiring in the housing needs to be considered.

In view of the above, it is one of the non-limiting objects of the present invention to provide an improved structure regarding wiring of an impact tool having a vibration-proof structure.

According to a non-limiting 1 aspect of the present invention, there is provided an impact tool configured to linearly drive a tip tool along a drive axis by impacting the tip tool. The impact tool has a 1 st housing, a motor, a 2 nd housing, and a controller.

The 1 st housing defines a drive axis for the tip tool. The motor is accommodated in the 1 st housing. The 2 nd housing covers at least a portion of the 1 st housing. The 2 nd housing is connected to the 1 st housing by at least 1 elastic member in such a manner as to be movable in the 1 st direction parallel to the drive axis with respect to the 1 st housing. The controller is accommodated in the 2 nd housing. The controller is configured to control driving of the motor. The 2 nd housing has at least 1 opening for wiring, the at least 1 opening communicating the inside with the outside of the 2 nd housing. At least 1 wire extending from the controller extends to the outside of the 2 nd housing through at least 1 opening.

According to the impact tool of the present embodiment, even if the 1 st housing vibrates in the 1 st direction along with the driving of the motor, the 2 nd housing can move in the 1 st direction parallel to the driving axis with respect to the 1 st housing in a state where the loading force of at least 1 elastic member acts. According to this vibration isolation housing structure, transmission of vibration to the 2 nd housing is suppressed. Therefore, the controller housed in the 2 nd housing can be effectively protected from vibration. And, at least 1 wire extending from the controller extends to the outside of the 2 nd housing through at least 1 opening. Accordingly, the possibility of the electric wire coming into contact with the 1 st housing when the 1 st housing vibrates is reduced, and deterioration of the electric wire is suppressed. In addition, the assembly operator of the impact tool can physically connect at least 1 electric wire extending from the controller with other electric wires, parts, or at least 1 connection member (connector, coupler, terminal, etc.) other than the electric wires, outside the 2 nd housing. Therefore, the efficiency of the wiring work (wiring work) improves.

Drawings

Fig. 1 is a perspective view of an electric hammer (hammer) according to an embodiment of the present invention.

Fig. 2 is a front view of the electric hammer.

Fig. 3 is a section view of fig. 2 in section III-III.

Fig. 4 is a section IV-IV of fig. 3.

Fig. 5 is a partial enlarged view of fig. 4.

Fig. 6 is a plan view of the electric hammer with the top cover removed.

Fig. 7 is a perspective view of the controller housing in a state in which the controller assembly is accommodated.

Fig. 8 is a perspective view of the controller housing.

Fig. 9 is another perspective view of the controller housing.

Fig. 10 is a perspective view of the electric hammer with the handle on the right side and the cover portion of the battery case removed.

Fig. 11 is a right side view of the electric hammer with the top cover, the right side handle, and the cover portion of the battery case removed.

Fig. 12 is a cross-sectional view of XII-XII of fig. 4.

Fig. 13 is a sectional view of fig. 4 from XIII-XIII.

Fig. 14 is a perspective view of the electric hammer with the left handle and the cover of the battery case removed.

Fig. 15 is a left side view of the electric hammer with the top cover, the left handle, and the cover portion of the battery case removed.

Description of the reference numerals

1: an electric hammer; 11: a housing; 111: a1 st elastic member; 112: a2 nd elastic member; 114: a1 st guide part; 115: a guide cylinder; 116: a guide groove; 117: a2 nd guide part; 118: a guide protrusion; 119: a guide rib; 15: a tool holder; 2: a1 st housing; 21: an upper accommodating portion; 212: a spring seat; 213: a spring seat; 26: a lower accommodating portion; 261: a cylinder; 3: a2 nd housing; 30L: an opening; 30R: an opening; 301: an opening; 31: a main cover; 311: a side wall portion; 312: a spring seat; 313: a front wall portion; 315: a rear wall portion; 317: an inner wall portion; 318: a passage; 34: a top cover; 341: an upper wall portion; 343: a peripheral wall portion; 37: a controller housing; 370: a bottom wall portion; 371: a concave portion; 372: a wire guide section; 373: a passage; 374: a spring seat; 375: a concave portion; 376: a concave portion; 379: a locking piece; 38: an electric wire; 38L: a wire group; 38R: a wire group; 381: a terminal wire; 382: an LED wire; 383: an electric wire for a motor; 384: a connector; 385: a switch wire; 4: a handle; 4L: a left handle; 4R: a right handle; 41: a base portion; 42: a holding part; 43: a trigger; 5: a battery case; 501: a base portion; 502: a cover section; 51: an upper wall portion; 511: a1 st upper wall; 512: a2 nd upper wall; 513: an opening; 52: a lower wall portion; 53: a rear wall portion; 54: a side wall portion; 59: a battery; 6: a battery mounting portion; 61: an engagement portion; 65: a terminal portion; 651: a terminal; 655: a base; 70: a controller; 700: a controller assembly; 705: a heat radiating member; 71: a motor; 711: an output shaft; 715: an electric wire; 716: a connector; 72: a switch; 73: a motion conversion mechanism; 731: a crankshaft; 733: a connecting rod; 735: a piston; 75: an impact mechanism; 750: an air chamber; 751: a ram; 753: a striker; 77: a main power switch; 78: a wireless unit; 781: a start button; 79: an LED lamp; a1: a drive axis; a2: an axis.

Detailed Description

In a non-limiting embodiment of the present invention, the 2 nd housing may include a 2 nd housing body and a shell. The 2 nd housing body may have at least 1 opening. The casing may be fixedly connected to the 2 nd casing main body, and may house the controller. The housing may have a partition wall portion and at least 1 guide portion. The partition wall may be separate from the 1 st housing and disposed between the controller and the 1 st housing. At least 1 guide part is configured to guide at least 1 wire extending from the controller to the outside of the housing and at least 1 opening. According to this embodiment, the partition wall portion can effectively isolate the controller from the vibration of the 1 st housing. In addition, the at least 1 guide portion can effectively reduce the possibility that the at least 1 wire extending from the controller contacts the 1 st housing within the 2 nd housing.

In addition to or instead of the above embodiment, the 2 nd housing may include a 1 st portion accommodating the controller and a 2 nd portion connected to the 1 st portion. The at least 1 opening of the 2 nd housing may be at least 1 recess (notch) formed in the connection end with the 2 nd portion in the 1 st portion or the connection end with the 1 st portion in the 2 nd portion. According to this embodiment, at least 1 wire extending from the controller can be led out to the outside of the 2 nd housing at a position relatively close to the controller. Therefore, the possibility that the electric wire contacts the 1 st housing when the 1 st housing vibrates can be effectively reduced. In addition, the assembly worker can easily draw out the electric wire to the outside of the 2 nd housing by simply connecting the 1 st and 2 nd portions in a state where at least 1 electric wire extending from the controller passes through at least 1 recess.

In addition to or instead of the above embodiments, the impact tool may further have at least 1 battery mounting portion, and the at least 1 battery mounting portion may be configured to detachably mount the battery. At least 1 battery mounting portion may be disposed outside the 2 nd case. At least 1 of the battery mounting portions may have terminals that are electrically connectable with terminals of the battery in response to the mounting of the battery. The at least 1 electric wire extending from the controller may include at least 1 terminal electric wire connected to the terminal.

According to this embodiment, the assembly worker can easily connect the terminal electric wire extending from the opening of the 2 nd case to the terminal of the battery mounting portion outside the 2 nd case. The terminal wire may be directly connected to the terminal outside the 2 nd housing. Alternatively, the terminal wire and at least 1 wire extending from the terminal may be directly connected to the outside of the 2 nd housing. Alternatively, the terminal wire and at least 1 wire extending from the terminal may be connected to the outside of the 2 nd housing by at least 1 connecting member (connector, coupler, terminal, etc.) independent of the wire. The "connection" in the following embodiments includes the same manner as long as it is not specifically limited.

In addition to or instead of the above embodiments, the impact tool may further have at least 1 handle, the at least 1 handle having a grip. At least 1 handle may be attached to the 2 nd housing outside the 2 nd housing. Further, at least 1 handle may be at least partially covered with at least 1 wire outside the 2 nd housing. According to this embodiment, at least 1 handle is integrated with the 2 nd housing, and therefore, transmission of vibration to at least 1 handle is suppressed. In addition, at least 1 handle can protect at least a portion of the electric wire that extends to the outside of the 2 nd housing through at least 1 opening.

In addition to or instead of the above embodiments, the impact tool may further have a switch for activating the motor, wherein the switch is accommodated in at least 1 handle. The at least 1 wire extending from the controller may include a switch wire connected to the switch. According to this embodiment, the assembly worker can easily connect the switch wire extending from the opening of the 2 nd housing to the switch on the outside of the 2 nd housing.

In addition to or instead of the above embodiments, at least 1 handle may be located between the controller and at least 1 battery mounting portion in the 1 st direction. According to this embodiment, a configuration is achieved in which at least 1 handle is easily covered over at least a part of the wire for protecting the terminal.

In addition to or instead of the above embodiment, at least 1 of the battery mounting portions may include a wall portion adjacent to at least 1 of the handles, protruding outward from the 2 nd housing. The terminal of the battery mounting portion may be supported by the wall portion. The terminal wire may be connected to the terminal through an opening formed in the wall portion. According to this embodiment, an effective path of the terminal wire is formed.

In addition to or instead of the above embodiment, at least 1 handle may include 2 handles, the 2 handles being disposed on both sides of the 2 nd housing in the 2 nd direction orthogonal to the drive axis. The grip portions of the 2 handles may extend along an axis extending in the 2 nd direction. According to this embodiment, an impact tool is realized which is suitable for a user to use with both hands holding the grip portion and the tip tool in a downward-oriented posture.

In addition to or instead of the above embodiment, at least 1 battery mounting portion may include 2 battery mounting portions, which are respectively disposed adjacent to 2 handles on both sides of the 2 nd housing in the 2 nd direction. The at least 1 opening may include 2 openings, and the 2 openings may be provided at both side portions of the 2 nd housing in the 2 nd direction. The at least 1 terminal wire may include 2 terminal wires, and the 2 terminal wires may extend to the outside of the 2 nd housing through the 2 openings and be connected to the terminals of the 2 battery mounting portions, respectively. According to this embodiment, the weight balance in the 2 nd direction can be optimized. Therefore, the user can perform the impact work while maintaining the impact tool in a more stable state.

In addition to or instead of the above embodiment, the impact tool may further include a switch for activating the motor, wherein the switch is accommodated in one of the 2 handles. The at least 1 wire extending from the controller may include a switch wire and a motor wire, wherein the switch wire is connected to the switch; the motor wire is connected to a wire extending from the motor outside the 2 nd housing and inside the other of the 2 handles. According to this embodiment, the assembly worker can easily connect the motor electric wire and the electric wire extending from the motor to each other outside the 2 nd housing. In addition, 2 handles can be effectively utilized to protect the electric wires and the switch.

In addition to or instead of the above embodiments, the 2 nd housing may have an inner wall. In the 2 nd casing, a passage separated from the 1 st casing is defined by an inner wall. The electric wire extending from the motor may extend outside the 2 nd housing through the passage. According to this embodiment, the possibility that the portion of the electric wire extending from the motor, which is disposed in the 2 nd housing, comes into contact with the 1 st housing when the 1 st housing vibrates can be reduced, thereby suppressing degradation of the electric wire.

An electric hammer (also referred to as a breaking hammer (breaker) or an electric pick (demolition hammer)) 1 according to a representative and non-limiting embodiment of the present invention will be described below with reference to the accompanying drawings. The electric hammer 1 is an example of an impact tool configured to linearly drive a tip tool (for example, a hammer bit) along a predetermined drive axis A1.

First, a schematic structure of the electric hammer 1 will be described.

As shown in fig. 1 and 2, the electric hammer 1 mainly has a housing 11, a tool holder 15, a pair of handles 4, and a pair of battery housings 5.

The housing 11 is an elongated casing extending along the drive axis A1. The tool holder 15 is connected to one end of the housing 11 in the longitudinal direction, and extends along the drive axis A1. The tool holder 15 is configured to detachably hold a distal tool (not shown). The handles 4 each include a grip 42 to be gripped by a user. The handle 4 is connected to the other end portion of the housing 11 in the longitudinal direction so that the grip portions 42 protrude from the housing 11 in opposite directions. In the present embodiment, the grip portion 42 extends along an axis A2 substantially orthogonal to the drive axis A1. According to this arrangement, the housing 11 and the 2 handles 4 have a T-shape as viewed in a direction orthogonal to the drive axis A1 and the axis A2. A trigger 43 is provided in one grip 42 of the 2 handles 4.

In general, the operator uses the hammer 1 in a state where the operator grips the grip portion 42 with the left hand and the right hand and the tool attached to the tip end of the tool holder 15 protrudes downward. Therefore, hereinafter, for convenience of explanation, the extending direction of the drive axis A1 (also referred to as the long axis direction of the housing 11) is defined as the up-down direction of the electric hammer 1. In the up-down direction, the side where the tool holder 15 is disposed is defined as the lower side of the electric hammer 1, and the opposite side (the side where the handle 4 is disposed) is defined as the upper side of the electric hammer 1. The extending direction of the axis A2 (the grip portion 42) is defined as the lateral direction of the hammer 1. In the left-right direction, the side where the grip portion 42 provided with the trigger 43 is disposed is defined as the right side of the electric hammer 1, and the opposite side (the side where the grip portion 42 without the trigger 43 is disposed) is defined as the left side of the electric hammer 1. The direction orthogonal to the up-down direction and the left-right direction is defined as the front-rear direction of the electric hammer 1.

The battery 59 can be mounted on the battery case 5. In the present embodiment, the 2 battery cases 5 are provided adjacent to the handles 4 below the 2 handles 4, respectively. The electric hammer 1 operates on 2 batteries 59 attached to the battery case 5 as a power source. Specifically, in response to the user pressing the trigger 43, the motor 71 (see fig. 3 and 4) is driven, and the tip tool is thereby driven in a straight line.

Next, a detailed structure of the electric hammer 1 will be described.

As shown in fig. 3 to 4, the housing 11 includes a1 st housing 2 and a 2 nd housing 3. The 1 st housing 2 and the 2 nd housing 3 are connected to be relatively movable in the extending direction of the drive axis A1, that is, in the up-down direction.

Next, the 1 st housing 2 and the components disposed therein will be described.

The 1 st housing 2 houses the motor 71 and the driving mechanism (the motion converting mechanism 73 and the striking mechanism 75) of the tip tool. Thus, the 1 st housing 2 can also be referred to as a drive mechanism housing. The 1 st housing 2 includes an upper housing portion 21 and a lower housing portion 26 connected to a lower end portion of the upper housing portion 21.

The upper housing portion 21 mainly houses a part of the motor 71 and the motion conversion mechanism 73. The motor 71 is accommodated in the upper end portion of the upper accommodating portion 21. The motor 71 of the present embodiment is a brushless motor. The motion conversion mechanism 73 is disposed below the motor 71. The motion conversion mechanism 73 converts rotational motion into linear motion, and in the present embodiment, a well-known piston crank mechanism is used. When briefly described, the motion conversion mechanism 73 includes: a crankshaft 731 operatively connected to an output shaft 711 of the motor 71 and having an eccentric pin; and a piston 735 that can be connected to the eccentric pin by a connecting rod 733 in an operable manner. The motor 71 and the motion converting mechanism 73 are configured such that the rotation axis of the output shaft 711 and the rotation axis of the crankshaft 731 are orthogonal to the drive axis A1 and extend in the front-rear direction, respectively.

The lower housing portion 26 is formed in a substantially cylindrical shape as a whole, and is also referred to as a cylindrical portion. In the present embodiment, the lower housing portion 26 is a member independent of the upper housing portion 21, and is fixed to the lower end portion of the upper housing portion 21 and extends along the drive axis A1. A tool holder 15 is fixed to a lower end of the lower housing 26. The cylinder 261 is accommodated in the lower accommodating portion 26. A piston 735 and an impact mechanism 75 are disposed inside the cylinder 261. The piston 735 reciprocates in the up-down direction in the cylinder 261 in response to the driving of the motor 71. The impact mechanism 75 of the present embodiment has a well-known structure including a striker 751 and a striker 753. The impact mechanism 75 operates in response to pressure fluctuations generated in the air chamber 750 by the reciprocation of the piston 735, and drives the tool bit linearly along the drive axis A1.

Next, the 2 nd housing 3 and the components disposed therein will be described.

As shown in fig. 1 to 5, the entire 2 nd housing 3 is a box-like body with an open lower end, and is configured to cover an upper portion of the 1 st housing 2 (in detail, substantially the entire upper housing portion 21). Thus, the 2 nd housing 3 can also be referred to as a housing shell or casing. The 2 nd casing 3 of the present embodiment includes a main casing 31, a top casing 34, and a controller casing 37 which are fixedly connected to each other.

The main cover 31 is a tubular member, and is disposed so as to surround the outer peripheral portion of the upper housing portion 21. The main cover 31 includes a pair of right and left side wall portions 311, and a front wall portion 313 and a rear wall portion 315 that connect the side wall portions 311. The main cover 31 of the present embodiment is formed of 2 split bodies (left side case and right side case) connected and fixed to each other in the left-right direction.

The top cover 34 is a box-like body having an open lower end, and includes an upper wall portion 341 and a peripheral wall portion 343 protruding downward from the peripheral edge of the upper wall portion 341. The lower end of the peripheral wall 343 is fixed to the upper end of the main cover 31 by a plurality of screws. The upper end portion of the 1 st housing 2 (upper housing portion 21) (specifically, a part of the housing portion of the motor 71) protrudes into the top cover 34, which is a position above the upper end of the main cover 31. However, the upper end of the 1 st housing 2 is located below the upper wall portion 341 of the top cover 34, and a space is formed between the upper end of the 1 st housing 2 and the top cover 34. In the space inside the top cover 34, a controller case 37 is disposed and connected to the top cover 34.

As shown in fig. 5, the controller case 37 is a case that mainly houses (holds) the controller 70. The controller 70 is configured to control the operation of the electric hammer 1 (driving of the motor 71, etc.). In the present embodiment, the controller 70 is a microcomputer including a CPU (Central Processing Unit ), a ROM (Read Only Memory), a Memory, and the like, and is mounted on a control board. The microcomputer is supported by the heat sink 705, and forms a controller assembly 700 integrally with the heat sink 705. However, a control circuit other than a microcomputer may be used for the controller 70. In addition, the microcomputer (control circuit) need not be integrated with the heat radiation member 705.

As shown in fig. 5 to 8, a recess 371 that opens upward is formed in the center of the controller case 37. The recess 371 has a shape (rectangular shape long from the left to right as viewed from above) matching the controller assembly 700, and the controller assembly 700 is fitted into the recess 371.

The controller case 37 has 2 locking pieces 379 that can be elastically deformed (bent). The 2 locking pieces 379 are provided adjacent to the left edge and the right edge of the recess 371, respectively. The tip end portion of the locking piece 379 has a claw (projection) projecting toward the center portion of the recess 371. When the assembly operator receives the controller assembly 700 in the controller case 37, the locking piece 379 is bent away from the recess 371, thereby allowing the controller assembly 700 to fit into the recess 371. When the locking piece 379 returns to its original position in response to the controller assembly 700 being inserted into the recess 371, the claw of the locking piece 379 engages with the upper surface of the controller assembly 700, preventing the controller assembly 700 from being separated from the recess 371.

In this way, the locking piece 379 is engaged with the controller assembly 700 by a snap, so that the controller assembly 700 can be temporarily fixed (temporarily fixed) to the controller case 37. The term "temporary fixing" means fixing or holding in a state that allows slight movement or that allows detachment by a certain degree of external force.

The controller case 37 is fixed to the top cover 34 (in detail, the upper wall 341) from below by a plurality of screws in an orientation in which the controller assembly 700 accommodated in the recess 371 faces the upper wall 341 of the top cover 34. The bottom wall portion 370 of the controller case 37 is upwardly distant from the upper end of the 1 st housing 2 (see fig. 5).

In the present embodiment, since the controller case 37 has a temporary fixing function, the assembly operator can process the controller 70 and the controller case 37 integrally. For example, even if the controller housing 37 is in a posture (upside down) in which the bottom wall portion 370 is located on the upper side and the controller assembly 700 is located on the lower side, the controller assembly 700 does not fall off from the controller housing 37. Therefore, the assembly worker can place the top cover 34 on the work table with the opening at the lower end thereof facing upward, invert the controller case 37, and easily fix the controller case to the top cover 34 with screws from above. Therefore, the efficiency of the assembly work is improved.

In the present embodiment, the controller case 37 supports the main power switch 77 and the wireless unit 78 (see fig. 6) in addition to the controller 70. The main power switch 77 is a switch for putting the electric hammer 1 in an on state. In response to the main power switch 77 being turned on, electric power is supplied from the battery 59 to the controller 70 or the like. The wireless unit 78 is a well-known device capable of transmitting and receiving signals between devices (for example, dust collectors) used with the electric hammer 1 by wireless. The wireless unit 78 is configured to perform communication for establishing a correspondence relationship (so-called pairing) between devices used with the electric hammer 1 in response to the start button 781 being in the on state.

The main power switch 77 and the wireless unit 78 are fitted into recesses 375 and 376 (see fig. 8) provided in the controller case 37 adjacent to the recess 371, respectively. The main power switch 77 and the wireless unit 78 are electrically connected to the controller 70 via wires extending from the respective lower sides, but detailed illustration is omitted. The main power switch 77 and the activation button 781 of the wireless unit 78 are exposed to the outside through an opening formed in the top cover 34 in a state where the controller case 37 is fixed to the top cover 34 (see fig. 1). Accordingly, the user can manually operate the main power switch 77 and the start button 781 of the wireless unit 78 from the outside of the top cover 34.

As shown in fig. 6 to 9, the controller case 37 has a structure for guiding various electric wires 38 extending from the controller 70. More specifically, the left and right sides of the controller case 37 are provided with wire guides 372, respectively. The wire guide 372 is a wall defining a passage 373 that communicates with the inner space of the recess 371. The wire guide 372 of the present embodiment is a wall portion having a substantially U-shaped cross section, and each of the passages 373 extends downward from the recess 371 to the end of the controller case 37 while being gently curved. The wires 38 extending from the controller 70 are divided into a wire group 38L extending to the left and a wire group 38R extending to the right, and are guided to the outside of the controller case 37 by a left wire guide 372 and a right wire guide 372, respectively. These wires 38 are connected to terminals 651 (see fig. 6) of the battery mounting portion 6. The wiring of the electric hammer 1 will be described in detail later.

Next, the handle 4 and the components disposed therein will be described. For convenience of explanation, the case where 2 handles 4 are collectively referred to or any one of the 2 handles is referred to as "handle 4" hereinafter. In addition, the right handle 4R is designated in the case of referring to the handle 4 provided with the trigger 43, and the left handle 4L is designated in the case of referring to the handle 4 without the trigger 43.

As shown in fig. 5, the 2 handles 4 are arranged substantially symmetrically with respect to a plane P passing through the center of the electric hammer 1 in the left-right direction (a plane including the drive axis A1 and the rotation axis of the output shaft 711 of the motor 71). The 2 handles 4 have substantially the same structure except for the point where only the right handle 4R holds the trigger 43. In the present embodiment, the handle 4 is a separate member from the 2 nd housing 3, and is connected and fixed to the 2 nd housing 3. Each handle 4 includes a base portion 41 and a grip portion 42.

The base portion 41 is a portion attached to the side wall portion 311 of the 2 nd housing 3 (specifically, the main cover 31). The base portion 41 is formed as a box-shaped portion with a side opening as a whole, and covers substantially the upper half of the side wall portion 311. The end portion on the opening side of the base portion 41 is fixed to the side wall portion 311 by a plurality of screws. Accordingly, the handle 4 is integrated with the 2 nd housing 3.

The grip portion 42 is formed in a bottomed tubular shape, and is connected to the base portion 41 so that an inner space of the grip portion 42 communicates with an inner space of the base portion 41. In the present embodiment, the base portion 41 and the grip portion 42 are integrally formed, but the base portion 41 and the grip portion 42 may be formed as separate members and fixed to each other. An opening for exposing the trigger 43 to the outside is formed only in the upper portion of the grip portion 42 of the right grip 4R.

The trigger 43 is supported rotatably in a substantially vertical direction by the right handle 4R. In normal operation, a part of the trigger 43 is located at a disconnected position protruding upward from the opening of the grip portion 42 of the right handle 4R by the biasing force of the spring. In response to the user pressing down the trigger 43 while holding the grip 42 of the right grip 4R by hand, the trigger 43 rotates downward.

A switch 72 for activating the motor 71 is housed in the base portion 41 of the right handle 4R. More specifically, the plurality of ribs protrude rightward from the outer surface of the right side wall portion 311 of the main cover 31. The switch 72 is fitted into a recess defined by the rib, and is supported by a right side wall portion 311 (see fig. 10). During the time that the trigger 43 is in the open position, the switch 72 remains in the open state. On the other hand, when the trigger 43 is pressed by the user and turned to the on position, a part of the trigger 43 presses the plunger of the switch 72, and the switch 72 is turned on. The controller 70 drives the motor 4 during the time that the switch 72 is in the on state.

Next, the structure of the battery case 5 will be described.

As shown in fig. 5, the 2 battery cases 5 are disposed adjacent to each other immediately below the 2 handles 4, and protrude from the side wall portions 311 of the 2 nd case 3 (in detail, the main cover 31) to the left and right sides. The 2 battery cases 5 are arranged substantially symmetrically with respect to the plane P, and have substantially the same structure. According to this arrangement of the battery case 5, the weight balance in the left-right direction of the electric hammer 1 can be optimized in a state where 2 batteries 59 are mounted. When the 2 batteries 59 are attached, the center of gravity of the entire electric hammer 1 in the downward posture is moved downward by the tip tool, and therefore, the user can perform the impact operation while maintaining the electric hammer 1 in a stable state.

As shown in fig. 5, 10 to 11, the battery case 5 is formed of an upper wall portion 51, a lower wall portion 52, a rear wall portion 53, and a side wall portion 54. The side wall 54 is a substantially rectangular wall corresponding to the shape of the battery 59, and is disposed substantially parallel to the side wall 311 of the main cover 31, apart from the side wall 311 to the side (left or right). The upper wall 51, the lower wall 52, and the rear wall 53 protrude laterally (left or right) from the side wall 311 of the main cover 31, respectively, and are connected to the upper edge, the lower edge, and the rear edge of the side wall 54. According to this structure, the battery case 5 defines a space for accommodating the battery 59 whose front is open.

In the present embodiment, the upper wall portion 51, the lower wall portion 52, and the rear wall portion 53 have a double-wall structure. That is, the upper wall portion 51, the lower wall portion 52, and the rear wall portion 53 each have an internal space. The inner spaces of the upper wall portion 51, the lower wall portion 52, and the rear wall portion 53 are connected to each other, and the inner space 50 of the battery case 5 is integrally formed.

In the present embodiment, the battery case 5 includes: a base portion 501 integrally formed with the side wall portion 311 of the main cover 31; and a cover 502, which is a member independent of the base 501, and is fixed to the base 501 by a plurality of screws (see fig. 10). The base portion 501 includes approximately half of the upper wall portion 51, the lower wall portion 52, and the rear wall portion 53 in the left-right direction. The cover 502 includes the remaining substantially half of the upper wall 51, the lower wall 52, the rear wall 53, and the side wall 54.

The battery case 5 has a battery mounting portion 6. The battery mounting portion 6 is configured to detachably receive the battery 59. The battery 59 is a known rechargeable battery (also referred to as a battery pack) and includes a substantially rectangular parallelepiped case and a plurality of cells (cells) accommodated in the case. The battery 59 is selectively mountable to various electric tools including the electric hammer 1.

The battery mounting portion 6 includes an engagement portion 61 that can be physically engaged with the battery 59, and a terminal portion 65 that can be electrically connected to a terminal of the battery 59.

Since the structure is well known, detailed illustration is omitted, but the engaging portion 61 includes a pair of (2) rails. The rail is provided adjacent to the upper wall 51 at a lower side of the upper wall 51. The rails are separated in the left-right direction and extend in the front-rear direction in parallel with each other. The pair of rails are slidably engaged with a pair of grooves provided at the upper end of the case of the battery 59.

The terminal portion 65 includes a plate-like base (support body) 655 and a plurality of terminals 651 supported by the base 655. In addition, the plurality of terminals 651 includes at least a pair of electrode terminals. The terminal portion 65 can also be referred to as a terminal assembly or a terminal block. The terminal portion 65 is sandwiched and supported (held) by the 2 split bodies of the upper wall portion 51 by the connection between the base portion 501 and the cover portion 502 of the battery case 5. In addition, as described above, the upper wall portion 51 has a double wall structure. Specifically, the upper wall portion 51 includes a 1 st upper wall 511 and a 2 nd upper wall 512 disposed below the 1 st upper wall 511. The base 655 of the terminal 65 is accommodated in the inner space of the upper wall 51 formed between the 1 st upper wall 511 and the 2 nd upper wall 512. A portion of the terminal 651 is exposed to the upper side of the base 655. The other portion of the terminal 651 protrudes from an opening formed in the 2 nd upper wall 512 to below the upper wall portion 51.

When the user slides the battery 59 from the front to the rear of the battery case 5 to a predetermined position with the grooves of the battery 59 engaged with the rails of the engaging portion 61, the terminals of the battery 59 and the terminals 651 of the battery mounting portion 6 come into contact, thereby electrically connecting. When the battery 59 is placed at the predetermined position, the locking member of the battery 59 is engaged with the recess provided in the engaging portion 61, whereby the battery 59 is locked at the predetermined position. When the battery 59 is mounted on the battery mounting portion 6 in this way, the battery case 5 substantially covers a portion other than the front surface of the battery 59. Therefore, the battery case 5 functions as a protector that protects the battery 59 from external force.

Further, an LED lamp 79 is held at the lower end of the battery case 5. More specifically, the LED lamp 79 is fitted and supported in a recess provided in the lower wall 52. The LED lamp 79 can irradiate light to a work area (an area where the tip of the tip tool is disposed) through an opening provided in the lower wall portion 52. The controller 70 controls driving of the LED lamp 79.

Next, a connection structure of the 1 st housing 2 and the 2 nd housing 3 will be described.

As described above, in the present embodiment, the 1 st housing 2 and the 2 nd housing 3 are connected so as to be relatively movable in the up-down direction. As described above, 2 handles 4 and 2 battery cases 5 are integrated with the 2 nd case 3. Accordingly, the 2 nd housing 3, the handle 4, and the battery housing 5 are integrally movable relative to the 1 st housing 2 in the up-down direction.

More specifically, as shown in fig. 5, a pair of 1 st elastic members 111 and a pair of 2 nd elastic members 112 (only 1 is shown in fig. 5) are interposed between the 1 st housing 2 and the 2 nd housing 3 in the up-down direction. In the present embodiment, the 1 st elastic member 111 and the 2 nd elastic member 112 are compression coil springs, respectively. The 1 st housing 2 and the 2 nd housing 3 are relatively movable in the up-down direction (in the direction approaching each other and the direction separating from each other) in a state where the loading forces of the 1 st elastic member 111 and the 2 nd elastic member 112 act.

The 1 st elastic member 111 is interposed between the 1 st housing 2 and the 2 nd housing 3 at a position lower than the grip portion 42 (axis A2). In the present embodiment, the 21 st elastic members 111 are arranged substantially symmetrically with respect to the drive axis A1 (in detail, symmetrically with respect to the plane P). More specifically, spring seat portions 212 are provided on the left and right side portions of upper housing portion 21 of first housing 2. Spring seat portions 312 are provided in the left and right side wall portions 311 of the main cover 31 of the 2 nd housing 3, respectively. The spring seat portion 312 of the 2 nd housing 3 is disposed above the spring seat portion 212 of the 1 st housing 2 in a manner facing thereto. The 1 st elastic member 111 is disposed so as to extend in the up-down direction between the spring seat 212 and the spring seat 312.

The 2 nd elastic member 112 is located between the 1 st housing 2 and the 2 nd housing 3 above the grip portion 42 (axis A2). In the present embodiment, the 2 nd elastic members 112 are arranged substantially symmetrically with respect to the drive axis A1. More specifically, 2 spring seats 213 (only 1 is shown in fig. 5) are provided on the upper surface of the upper housing portion 21 of the 1 st housing 2. 2 spring seats 374 (see fig. 9) are provided on the lower surface of the controller case 37 fixed to the top cover 34 of the 2 nd housing 3. The spring seat 374 of the controller case 37 is disposed above the spring seat 213 of the 1 st housing 2 so as to face the same. The 2 nd elastic member 112 is disposed so as to extend in the up-down direction between the spring seat portion 213 and the spring seat portion 374.

In the connection operation of the 1 st housing 2 and the 2 nd housing 3, first, the main cover 31 is connected to the 1 st housing 2 via the 1 st elastic member 111. After that, the top cover 34 is connected to the 1 st housing 2 via the 2 nd elastic member 112, and the top cover 34 is fixed to the main cover 31 by screws.

The housing 11 has a guide structure for guiding the relative movement of the 1 st housing 2 and the 2 nd housing 3 in the up-down direction.

As shown in fig. 5 and 12, the 21 st guide portions 114 are provided in the vicinity of the grip portion 42 (axis A2) in the up-down direction (substantially at the same position as the grip portion 42). In the present embodiment, the 21 st guide portions 114 are arranged substantially symmetrically with respect to the plane P. In the present embodiment, each 1 st guide 114 includes a guide cylinder 115 and a guide groove 116. The guide cylinder 115 is a cylindrical metal member. The 2 guide cylinders 115 are fixed to the left and right side portions of the upper housing portion 21 of the 1 st housing 2, respectively, and extend in the vertical direction so as to be orthogonal to the axis A2. The guide groove 116 is a groove defined by a curved surface and has a semicircular cross section. The curved surface of the guide groove 116 matches the outer circumferential surface of the guide cylinder 115. The 2 guide grooves 116 are formed inside the left and right side wall portions 311 of the main cover 31 of the 2 nd housing 3. The guide cylinders 115 are partially disposed in the guide grooves 116, respectively, and are slidable in the up-down direction along the guide grooves 116.

As shown in fig. 5 and 13, the 2 nd guide 117 is provided below the 1 st guide 114 in the vertical direction. More specifically, the 2 nd guide 117 is provided near the battery case 5 (at substantially the same position as the battery case 5) in the up-down direction. In the present embodiment, the 2 nd guide portions 117 are arranged substantially symmetrically with respect to the plane P. In the present embodiment, each 2 nd guide 117 includes a guide projection 118 and 2 guide ribs 119. The guide projection 118 is a projection having a rectangular cross section. The 2 guide protrusions 118 are formed on the left and right side portions of the upper housing portion 21 of the 1 st housing 2, respectively, and extend in the up-down direction. The 2 guide ribs 119 protrude from the inner sides of the left and right side wall portions 311 of the main cover 31 of the 2 nd housing 3 at the front side and the rear side of the guide projection 118, respectively. The guide protrusions 118 are partially disposed between the guide ribs 119, respectively, and are slidable in the up-down direction along the guide ribs 119.

According to the above configuration, the 1 st housing 2 and the 2 nd housing 3 are biased in the vertical direction away from each other (i.e., downward and upward) by the 1 st elastic member 111 and the 2 nd elastic member 112 in the initial state, and are disposed at the initial position (the position shown in fig. 5). On the other hand, when the impact work is performed, the 1 st housing 2 generates vibration in the extending direction (i.e., the up-down direction) of the drive axis A1. In response to this vibration, the 1 st housing 2 and the 2 nd housing 3 relatively move while receiving the loading force of the 1 st elastic member 111 and the 2 nd elastic member 112. During this time, the 1 st guide 114 and the 2 nd guide 117 stably guide the relative movement of the 1 st housing 2 and the 2 nd housing 3 in the up-down direction. According to this vibration isolation structure, vibration transmission from the 1 st housing 2 to the 2 nd housing 3 and the grip portion 42 gripped by the user can be suppressed. In addition, the controller 70 housed in the 2 nd housing 3 can be effectively protected from vibration.

Next, the wiring in the electric hammer 1, and more specifically, the arrangement and connection (wiring operation) of various electric wires will be described.

As described above, the left and right wire guides 372 guide the wire groups 38L, 38R extending from the controller 70 to the outside of the controller case 37, respectively. In more detail, as shown in fig. 7, the left wire guide 372 guides the wire group 38L in the left-down direction. The right wire guide 372 guides the wire group 38R in the right downward direction. As shown in fig. 6, the distal end of each wire guide 372 is located at substantially the same position as the outer surface of the 1 st housing 2 or at a position slightly closer to the 2 nd housing 3 side (between the outer surface of the 1 st housing 2 and the inner surface of the 2 nd housing 3) than the outer surface of the 1 st housing 2 in the left-right direction. Therefore, the wire guide 372 guides the wire groups 38L and 38R in the left-right direction to positions outside the 1 st housing 2. The wire groups 38L, 38R extend downward in the 2 nd housing 3 (top cover 34) from the corresponding wire guide portions 372, and extend outside the 2 nd housing 3 through the openings 30L, 30R provided in the 2 nd housing 3, respectively.

The openings 30L and 30R are openings for communicating the internal space and the external space of the 2 nd casing 3, and are provided for guiding the electric wires 38 extending from the controller case 37 disposed in the 2 nd casing 3 to the outside of the 2 nd casing 3. In the present embodiment, the openings 30L and 30R are recesses (notches) formed in the upper ends of the left and right side wall portions 311 of the main cover 31, respectively. The openings 30L and 30R are provided below the wire guide 372, respectively, and are provided at substantially the same positions as the wire guide 372 in the front-rear direction. Accordingly, the wire groups 38L, 38R are guided to the openings 30L, 30R by the wire guide 372, respectively, and reach the openings 30L, 30R by the shortest path.

As shown in fig. 6, 14 to 15, the left electric wire group 38L extends out of the 2 nd housing 3 from the opening 30L, extends to the outside of the left side wall 311, and is located inside the handle 4. The electric wire group 38L includes, among the electric wires 38, a terminal electric wire 381 connected to the terminal 651 of the left battery mounting portion 6, an LED electric wire 382 connected to the LED lamp 79, and a motor electric wire 383 connected to the electric wire 715 extending from the motor 71.

One end of the terminal wire 381 is directly (physically) connected to the terminal 651 of the terminal portion 65. As described above, the terminal portion 65 is supported by the upper wall portion 51 of the battery case 5 in a state in which the base portion 655 is disposed in the upper wall portion 51 of the battery case 5. An opening 513 is formed in the upper wall 341 in the 1 st upper wall 511 in a region immediately above a part of the terminal portion 65. The terminal wire 381 is connected to the terminal 651 (a portion exposed above the base 655) through the opening 513 in the upper wall 51.

One end of the LED wire 382 is connected to the LED lamp 79 fixed to the lower wall 52 of the battery case 5. More specifically, the LED wire 382 enters the internal space 50 of the battery case 5 from the opening 513 of the upper wall portion 341 of the battery case 5, extends to the substantially central portion of the lower wall portion 52, and is directly connected to the LED lamp 79.

Thus, the opening 513 forms an effective path from the inner space of the handle 4 to the terminal electric wire 381 and the LED electric wire 382 of the inner space 50 of the battery case 5. The internal space 50 of the battery case 5 is effectively used as a passage for the LED electric wire 382.

One end of the motor wire 383 is connected to the connector 384. The motor wire 383 is connected to a wire 715 extending from the motor 71 through a connector 384.

The electric wire 715 extending from the motor 71 extends rearward from the upper rear end portion (rear side of the motor 71) of the upper housing portion 21 of the 1 st housing 2 to the outside of the 1 st housing 2. The electric wire 715 extends inside the 2 nd housing 3 (main cover 31) and extends outside the 2 nd housing 3 through the opening 301 provided in the 2 nd housing 3.

The opening 301 is an opening that communicates the internal space and the external space of the 2 nd casing 3, and the opening 301 is provided for guiding the electric wire 715 extending from the motor 71 to the outside of the 2 nd casing 3. In the present embodiment, the opening 301 is a recess (notch) formed in the upper end of the rear end portion of the left side wall portion 311 of the main cover 31. The opening 301 is disposed at a position rearward of the opening 30L through which the electric wire group 38L passes.

Further, an inner wall (partition wall) 317 is provided inside the main cover 31. More specifically, the inner wall 317 is provided to correspond to the substantially left half of the rear wall 315 of the main cover 31 of the 2 nd housing 3 and the rear end of the left side wall 311. Gaps (spaces) are provided between the inner wall portion 317 and the outer surface of the upper housing portion 21, and between the inner wall portion 317 and the inner surfaces of the rear wall portion 315 and the side wall portion 311, respectively. The electric wire 715 extends from the opening 301 to the outside of the 2 nd housing 3 through a passage 318 defined between the inner wall portion 317 and the inner surfaces of the rear wall portion 315 and the side wall portion 311 of the main cover 31. The inner wall portion 317 protects the wire 715 by blocking the wire 715 from contact with the 1 st housing 2.

One end of the wire 715 is connected to a connector 716. The connector 384 of the motor wire 383 and the connector 716 of the wire 715 from the motor 71 are connected to each other, whereby the motor wire 383 and the wire 715 from the motor 71 are electrically connected. The plurality of ribs protrude leftward from the outer surface of the left side wall portion 311 of the main cover 31. The connectors 384 and 716 connected to each other are fitted into the recess defined by the rib, and are supported by the left side wall 311.

As shown in fig. 6, 10 to 11, the right electric wire group 38R extends from the opening 30R to the 2 nd housing 3, and extends outside the right side wall 311 and inside the handle 4. The electric wire group 38R includes a terminal electric wire 381 connected to the terminal 651 of the right battery mounting portion 6, an LED electric wire 382 connected to the LED lamp 79, and a switch electric wire 385 connected to the switch 72 for starting the motor 71, among the electric wires 38.

The wiring of the terminal wire 381 and the LED wire 382 of the right wire group 38R is substantially the same as the wiring of the terminal wire 381 and the LED wire 382 of the left wire group 38L. Specifically, the terminal wire 381 extends downward outside the right side wall 311, and is directly connected to the terminal 651 in the upper wall 51 through the opening 513 formed in the upper wall 51 of the battery case 5. The LED wire 382 extends downward outside the right side wall 311, enters the internal space 50 of the battery case 5 from the opening 513, and is directly connected to the LED lamp 79 through the internal space 50.

The switch wire 385 extends downward outside the right side wall 311. As described above, one end of the switch wire 385 is directly connected to the switch 72 of the rib held in the side wall portion 311.

As described above, the various electric wires 38 extending from the controller 70 extend to the outside of the 2 nd casing 3 through the openings 30L, 30R. Therefore, the possibility that the electric wire 38 is in contact with the 1 st housing when the 1 st housing vibrates is effectively reduced, thereby suppressing degradation of the electric wire 38. Therefore, in the electric hammer 1 of the present embodiment, in order to prevent the electric wire 38 from contacting the 1 st housing 2, a holding member (holder) for fixing the electric wire 38 to the inner surface side of the 2 nd housing 3 is not used.

In particular, in the present embodiment, the openings 30L, 30R are provided at the upper ends of the left and right side wall portions 311 of the main cover 31. The upper end of the side wall 311 is located at a position corresponding to the upper portion of the 1 st housing 2 in the vertical direction. Therefore, the distance of the electric wire 38 extending from the controller 70 to the side of the 1 st housing 2 can be made relatively short, and the electric wire 38 can be led out to the outside of the 2 nd housing 3 at a position relatively close to the controller 70.

In addition, in the present embodiment, the controller case 37 having the above-described structure helps to protect the electric wires 38 in the 2 nd housing 3 and to realize an optimal path to the openings 30L, 30R. Specifically, the bottom wall portion 370 prevents the electric wire 38 from coming into contact with the 1 st housing 2 between the electric wire 38 and the 1 st housing 2 in the up-down direction. The wire guide 372 guides the wire 38 to the openings 30L and 30R so as to be away from the 1 st housing 2. By employing such a controller housing 37, the possibility of the electric wire 38 coming into contact with the 1 st housing 2 can be reduced more reliably.

Further, the operator assembling the electric hammer 1 can easily perform the wiring operation of the electric wire 38 extending from the controller 70 and other electric wires or components on the outside of the 2 nd housing 3, as compared with the conventional art.

Specifically, in the wiring structure of the related art, in general, the electric wires 38 extending from the controller 70 housed in the top cover 34 and the electric wires extending from the components (for example, the motor 71 housed in the 1 st housing 2) disposed inside the main cover 31 are connected inside the housing 11 (the 2 nd housing 3). In this case, the assembly worker needs to connect these wires directly or through separate connection members, then store them in the housing 11, and connect the top cover 34 to the main cover 31. In this case, the assembly worker must house the connected electric wire in the 2 nd housing 3 in a state that it is difficult to be visually recognized, and therefore, the work efficiency is lowered. In addition, a part of the electric wire may be sandwiched between the top cover 34 and the main cover 31.

In contrast, in the present embodiment, as described above, the motor electric wire 383 extending from the controller 70 and the electric wire 715 extending from the motor 71 extend to the outside of the 2 nd casing 3 through the opening 30L and the opening 301, respectively. Therefore, the assembly worker can easily connect the motor wire 383 and the wire 715 to each other while visually inspecting them outside the left side wall portion 311. The motor wire 383 and the wire 715 may be directly connected without the connectors 384 and 716. The wiring step for connecting the motor wire 383 and the wire 715 may be performed before or after the top cover 34 is fixed to the main cover 31. Accordingly, the wiring operation can be made efficient. In addition, the possibility that a part of the motor wire 383 or the wire 715 is sandwiched between the top cover 34 and the main cover 31 can be reduced.

In particular, in the present embodiment, the openings 30L and 30R and the opening 301 are recesses (notches) formed in the upper end of the side wall portion 311 of the main cover 31. Therefore, the assembly worker can easily guide the electric wires 383, 715 out of the 2 nd housing 3 by simply connecting the top cover 34 and the main cover 31 with the electric wires 38, 715 passing through the corresponding openings 30L, 30R, 301, respectively.

The terminal wire 381, the LED wire 382, and the switch wire 385 also extend to the outside of the 2 nd housing 3 through the openings 30L and 30R, similarly to the motor wire 383. Therefore, the assembly worker can easily connect these wires to the terminals 651, the LED lamps 79, and the switches 72 supported on the outside of the 2 nd housing 3, respectively. In the present embodiment, the terminal wire 381, the LED wire 382, and the switch wire 385 are directly connected to the terminal portion 65, the LED lamp 79, and the switch 72 without separate connection members. Since the openings 30L and 30R are recesses (notches), the assembly worker can connect the top cover 34 and the main cover 31 with the terminal wire 381, the LED wire 382, and the switch wire 385 passing through the openings 30L and 30R in a state where the terminal portion 65, the LED lamp 79, and the switch 72 are connected in advance. Therefore, in addition to improving the efficiency of the wiring operation, the number of parts can be reduced.

Most of the electric wires disposed outside the 2 nd housing 3 are covered with the handle 4. The assembly operator can attach the handle 4 to the 2 nd housing 3 (main cover 31) after the wiring operation of the electric wire 38 and the corresponding component parts extending from the controller 70. Therefore, the handle 4 of the present embodiment can protect the electric wire while facilitating the wire connection operation.

Similarly, the remaining portion of the electric wire disposed outside the 2 nd case 3 is covered with the battery case 5. The battery case 5 includes a base portion 501 integral with the 2 nd case 3 and a cover portion 502 connected to the base portion 501. The assembly worker can attach the cover 502 to the base portion 501 after the wiring work of the electric wire 38 and the corresponding component extending from the controller 70 and the mounting work of the component to the battery case 5. Therefore, the battery case 5 of the present embodiment can protect the electric wires while facilitating the wiring operation.

The correspondence between each component (feature) of the above embodiment and each component (feature) of the present application or invention is shown below. However, the respective constituent elements of the embodiment are mere examples, and are not limited to the constituent elements of the present application or the present invention.

The electric hammer 1 is an example of a "striking tool". The 1 st elastic member 111 and the 2 nd elastic member 112 are examples of "elastic members", respectively. The openings 30L, 30R, 301 are examples of "openings for wiring". The main cover 31 and the top cover 34 are examples of the "2 nd housing main body", respectively. The controller case 37 is an example of a "case". The bottom wall portion 370 of the controller case 37 is an example of a "partition wall portion". The wire guide 372 is an example of a "guide". The top cover 34 and the controller case 37 are examples of "part 1" of the "2 nd housing". The main cover 31 is an example of "part 2". The upper wall 51 and the opening 513 of the battery case 5 are examples of "wall of the battery mounting portion" and "opening", respectively.

The above-described embodiment is merely an example, and the impact tool according to the present invention is not limited to the example electric hammer 1. For example, the following example modifications can be added. At least 1 of these modifications is used in combination with at least 1 of the features described in the electric hammer 1 of the embodiment and the respective aspects.

The impact tool according to the present invention may be a hammer drill that can rotationally drive a tip tool about a drive axis in addition to linearly driving the tip tool along the drive axis. The structure and arrangement of the motor or the driving mechanism (motion conversion mechanism, impact mechanism) of the tip tool can be appropriately changed to any known structure and arrangement according to the kind of the impact tool.

The shape and the constituent members of the 1 st housing 2 and the 2 nd housing 3 are not limited to the examples of the embodiment, and can be appropriately changed. For example, the number and positions of the electric wires 38 extending from the controller 70 and the openings (openings for wiring) for guiding the electric wires 715 extending from the motor 71 to the outside of the 2 nd housing 3 can be changed according to the number and positions of the electric wires or parts connected to each other. For example, the opening for wiring may be a recess (notch) formed at the lower end of the top cover 34, or may be a through hole formed in at least one of the main cover 31 and the top cover 34. The structure of the controller case 37 (for example, the shape, the number, and the position of the wire guides 372) can also be changed in response to the change of the opening for wiring.

The elastic connection structure of the 1 st housing 2 and the 2 nd housing 3 (for example, the kind, number, and position of the elastic members interposed between the 1 st housing 2 and the 2 nd housing 3) can be appropriately changed. The same applies to the guide structure (e.g., the structures, the number, and the positions of the 1 st guide portions 114 and the 2 nd guide portions 117) for the relative movement of the 1 st housing 2 and the 2 nd housing 3. Preferably, the number of the elastic members and the guide portions is 2 or more.

The 2 handles 4 may be attached to the top cover 34 (part of the 2 nd housing 3 housing the controller 70) and may be attached to the top cover 34 across the main cover 31 and the top cover 34. The number of handles 4 may be 1.

The number of battery mounting portions 6 (i.e., the number of batteries 59 that can be mounted on the electric hammer 1) may be 1 or 3 or more. The position of the battery mounting portion 6 can be changed as appropriate. Instead of having the battery mounting portion 6, the electric hammer 1 may have a power cord, and may be connected to an external power source through the power cord.

The following embodiments are constructed in view of the gist of the present invention and the embodiments described above. Any one or more of the following modes can be used in combination with the electric hammer 1 of the embodiment and its modification, or the inventions described in the respective modes.

Mode A1

The tip of the at least 1 guide portion is located at substantially the same position as the outer surface of the 1 st housing or between the outer surface and the inner surface of the 2 nd housing in the 2 nd direction orthogonal to the drive axis.

Mode A2

The at least 1 wire extending from the controller includes a1 st wire and a2 nd wire,

the at least 1 guide portion includes 2 guide portions, and the 2 guide portions are configured to guide the 1 st electric wire and the 2 nd electric wire toward the 2 openings, respectively, in directions opposite to each other in a2 nd direction orthogonal to the driving axis.

Mode A3

The at least 1 opening includes at least 1 st opening for the at least 1 wire extending from the controller and a2 nd opening for the wire extending from the motor.

Mode A4

The impact tool also has at least 1 battery housing attached to the outside of the 2 nd housing,

the at least 1 battery case includes the battery mounting portion configured to cover at least a portion of a battery mounted to the battery mounting portion,

at least a portion of the at least 1 battery case has a double-wall structure, and a portion of the at least 1 electric wire extending from the controller is disposed in an internal space defined by the double-wall structure.

Further, the following modes B1 to B13 are provided as non-limiting 1 object of providing a technique for improving the efficiency of the wire connection work in the impact tool. The following modes B1 to B13 may be used alone or in combination of 2 or more. Alternatively, at least 1 of the following modes B1 to B13 can be used in combination with at least 1 of the characteristics described in the electric hammer 1 of the embodiment, the modification described above, the modes A1 to A4, and the respective modes.

Mode B1

An impact tool configured to drive a tip tool in a straight line along a drive axis by impacting the tip tool, characterized in that,

has a housing and a controller, wherein,

the housing defining the drive axis;

the controller is configured to control the action of the impact tool,

the housing includes a1 st housing and a 2 nd housing,

the 2 nd shell is connected with the 1 st shell and at least accommodates the controller,

at least 1 wire extending from the controller and at least 1 part arranged in the 1 st housing are connected to each other outside the housing.

The term "disposed in the 1 st housing" in this embodiment includes a case where the "disposed in the 1 st housing" is disposed in the 1 st housing and a case where the "disposed in the 1 st housing" is supported (held) by the 1 st housing on the outside of the 1 st housing. As a non-limiting example of the "member disposed in the 1 st housing", a motor, a switch, and a terminal electrically connectable to a battery can be given.

The following non-limiting 3 examples are given as examples of the "connection to the outside of the case" of at least 1 wire extending from the controller housed in the 2 nd case and at least 1 component arranged in the 1 st case. In example 1, at least 1 wire extending from the controller and at least 1 wire extending from at least 1 component (typically, a motor) disposed inside the 1 st housing are directly connected to each other outside the housing. In example 2, at least 1 wire extending from the controller and at least 1 wire extending from at least 1 member (typically, a motor) disposed inside the 1 st housing are connected to each other at the outside of the housing through at least 1 connecting member (connector, coupler, terminal, etc.) other than the wire. In example 3, at least 1 wire extending from the controller is directly connected to at least 1 component supported (held) by the 1 st housing on the outside of the housing. In the following description, the expression "connected to the outside of the housing" includes the above 3 examples unless otherwise specified.

According to the impact tool of embodiment B1, the operator assembling the impact tool can easily perform the wiring operation between the controller housed in the 2 nd housing and at least 1 member disposed in the 1 st housing while visually inspecting the outside of the housing. Therefore, the efficiency of the wiring operation improves.

Mode B2

The impact tool according to the mode B1, characterized in that,

the 2 nd housing includes a 1 st part accommodating the controller and a 2 nd part connected with the 1 st part, at least 1 recess for wiring is formed in a connection end of the 1 st part with the 2 nd part or a connection end of the 2 nd part with the 1 st part,

the at least 1 recess communicates the inside and the outside of the housing in a state where the 1 st part and the 2 nd part are connected.

According to embodiment B2, the assembly operator can easily draw out the electric wire (and the electric wire extending from the component (e.g., motor) housed in the 1 st housing) to the outside of the housing by simply connecting the 1 st and 2 nd portions in a state where the electric wire extending from the controller housed in the 2 nd housing passes through at least 1 recess. In addition, the wiring step may be performed before or after the connection of the 1 st and 2 nd portions, and thus the work efficiency and convenience are improved.

Mode B3

The impact tool according to the mode B1 or the mode B2, characterized in that,

and at least 1 battery mounting portion configured to detachably mount a battery,

The at least 1 battery mounting portion has a terminal supported by the housing outside the first housing, capable of electrically connecting with the terminal of the battery in response to the mounting of the battery,

the at least 1 wire includes at least 1 terminal wire directly connected to the terminal.

According to the embodiment B3, in addition to the improvement of the efficiency of the wiring operation, the number of parts can be reduced.

Mode B4

The impact tool according to any one of aspects B1 to B3, characterized in that,

also comprises a motor which is accommodated in the 1 st shell,

the 2 nd housing is configured to cover at least a part of the 1 st housing, and is connected to the 1 st housing by at least 1 elastic member so as to be movable relative to the 1 st housing in the 1 st direction parallel to the drive axis.

According to mode B4, there is provided a casing having a vibration-proof structure. Therefore, even if the 1 st housing generates vibration in the 1 st direction along with the driving of the motor, the transmission of the vibration to the controller housed in the 2 nd housing can be suppressed. Accordingly, the controller can be protected from vibration. In addition, the electric wire disposed outside the 2 nd housing does not contact the 1 st housing when the 1 st housing vibrates, so deterioration of the electric wire can be suppressed.

Mode B5

The impact tool according to mode B4, characterized in that,

the 2 nd housing has an inner wall,

within the 2 nd housing, a passageway is defined through the interior wall spaced from the 1 st housing,

the at least 1 wire comprises a motor wire connected with the motor,

and a wire extending from the motor is connected to the motor wire by passing through the passage and extending to the outside of the 2 nd housing.

According to embodiment B5, the assembly worker can easily connect the electric wire extending from the controller and the electric wire extending from the motor to the outside of the housing. In addition, when the 1 st housing vibrates, the possibility that the portion of the electric wire extending from the motor, which is disposed in the 2 nd housing, contacts the 1 st housing can be reduced, thereby suppressing degradation of the electric wire.

Mode B6

The impact tool according to any one of the aspects B1 to B5, characterized in that,

and at least 1 handle, the at least 1 handle has a holding part, is connected and fixed on the outer side of the shell,

the at least 1 handle at least partially covers the at least 1 wire disposed outside the housing.

According to aspect B6, at least a part of the electric wire disposed outside the housing can be protected by at least 1 handle.

Mode B7

The impact tool according to mode B6, characterized in that,

the at least 1 handle comprises 2 handles, the 2 handles being arranged on both sides of the housing in a 2 nd direction orthogonal to the drive axis,

the grip portions of the 2 handles each extend along an axis extending in the 2 nd direction.

According to the aspect B7, an impact tool is realized which is suitable for a user to hold the holding portion with both hands and use in a posture in which the tip tool faces downward.

Mode B8

The impact tool according to aspect B3, or any one of aspects B4 to B7 depending directly or indirectly on aspect B3, characterized in that,

the at least 1 battery mounting portion includes 2 battery mounting portions, the 2 battery mounting portions being disposed on both sides of the housing in a 2 nd direction orthogonal to the drive axis, respectively.

According to the aspect B8, the weight balance in the 2 nd direction when the battery is mounted can be optimized. Therefore, the user can perform the impact work while maintaining the impact tool in a more stable state.

Mode B9

The impact tool according to mode B8, characterized in that,

the 2 battery mounting portions respectively include wall portions protruding outward from the housing,

the terminal is supported by the wall portion,

the at least 1 terminal electric wire includes 2 terminal electric wires connected to the terminals through openings formed in the wall portions of the respective 2 battery mounting portions.

According to the aspect B9, an effective path of the electric wire to the terminals of the 2 battery mounting portions can be formed.

Mode B10

The impact tool according to any one of aspects B1 to B9, characterized in that,

the 2 nd shell comprises a 2 nd shell main body and a shell body,

the shell is fixedly connected with the 2 nd shell main body and accommodates the controller,

the housing has a temporary fixing function of the controller.

According to aspect B10, the assembly worker can integrally process the controller and the housing while temporarily fixing the controller to the housing, and therefore, the operation of connecting and fixing the housing to the 2 nd housing is easy.

Mode B11

The housing has at least 1 opening for wiring,

the at least 1 opening communicates the inside and the outside of the case in a state where the 1 st case and the 2 nd case are connected.

Mode B12

The impact tool further has a motor accommodated in the 1 st housing,

the at least 1 opening (recess) for wiring includes a 1 st opening corresponding to the at least 1 electric wire extending from the controller and a 2 nd opening corresponding to an electric wire extending from the motor.

Mode B13

The impact tool further has a switch for activating the motor, the switch for activating the motor being supported to the housing outside the housing,

the at least 1 wire includes a switch wire directly connected to the switch,

the at least 1 handle is attached to the housing so as to cover the switch wire and the switch.

The correspondence between each of the components (features) of the embodiments B1 to B13 and each of the components (features) of the present application or invention is shown below. However, the respective constituent elements of the embodiment are merely examples, and the respective constituent elements of modes B1 to B13 are not limited.

The electric hammer 1 is an example of a "striking tool". The motor 71 is an example of "components disposed in the 1 st housing". The openings 30L, 30R, 301 are examples of "recesses for wiring". The 1 st elastic member 111 and the 2 nd elastic member 112 are examples of "elastic members", respectively. The upper wall 51 and the opening 513 of the battery case 5 are examples of "wall" and "opening", respectively. The top cover 34 is an example of the "2 nd housing main body". The controller case 37 is an example of a "case".

The above-described embodiments are merely examples, and the impact tools according to aspects B1 to B13 are not limited to the electric hammer 1 of the example. For example, the following modifications of examples can be added. At least 1 of these modifications can be used in combination with at least 1 of the features described in the electric hammer 1 and the respective aspects of the embodiment.

The impact tools according to aspects B1 to B13 may be hammer drills that are capable of rotationally driving the tip tool about a drive axis in addition to linearly driving the tip tool along the drive axis. The structure and arrangement of the motor or the driving mechanism (motion conversion mechanism, impact mechanism) of the tip tool can be appropriately changed to any known structure and arrangement according to the kind of the impact tool.

The shape and the constituent members of the 1 st housing 2 and the 2 nd housing 3 are not limited to the examples of the embodiment, and can be appropriately changed. For example, the number and positions of the electric wires 38 extending from the controller 70 and the openings (openings for wiring) for guiding the electric wires 715 extending from the motor 71 to the outside of the 2 nd housing 3 can be changed according to the number and positions of the electric wires or parts connected to each other. For example, the opening for wiring may be a recess (notch) formed at the lower end of the top cover 34, or may be a through hole formed in at least one of the main cover 31 and the top cover 34. The structure of the controller case 37 (for example, the shape, the number, and the position of the wire guides 372) can also be changed in response to the change of the opening for wiring.

The elastic connection structure of the 1 st housing 2 and the 2 nd housing 3 (for example, the kind, number, and position of the elastic members interposed between the 1 st housing 2 and the 2 nd housing 3) can be appropriately changed. The same applies to the guide structure (e.g., the structures, the number, and the positions of the 1 st guide portions 114 and the 2 nd guide portions 117) for the relative movement of the 1 st housing 2 and the 2 nd housing 3. Preferably, the number of the elastic members and the guide portions is 2 or more. The wiring structure according to the present invention can be applied to a case where the housing is formed of 2 housing portions (2 independent housing bodies) that are connected and fixed so as to be substantially immovable relative to each other.

The 2 handles 4 may be attached to the top cover 34 (part of the 2 nd housing 3 housing the controller 70) and may be attached to the top cover 34 across the main cover 31 and the top cover 34. The number of handles 4 may be 1.

The number of battery mounting portions 6 (i.e., the number of batteries 59 that can be mounted on the electric hammer 1) may be 1 or 3 or more. The position of the battery mounting portion 6 can be changed as appropriate. Instead of having the battery mounting portion 6, the electric hammer 1 may have a power cord, and may be connected to an external power source through the power cord.

Claims (12)

1. An impact tool configured to drive a tip tool in a straight line along a drive axis by impacting the tip tool, characterized in that,

Has a 1 st housing, a motor, a 2 nd housing and a controller, wherein,

the 1 st housing defines the drive axis;

the motor is accommodated in the 1 st housing;

the 2 nd housing covers at least a part of the 1 st housing, the 2 nd housing being connected to the 1 st housing by at least 1 elastic member in a manner movable relative to the 1 st housing in a 1 st direction parallel to the drive axis;

the controller is accommodated in the 2 nd housing and configured to control driving of the motor,

the 2 nd housing has at least 1 opening for wiring, the at least 1 opening communicates the inside with the outside of the 2 nd housing,

at least 1 wire extending from the controller extends to the outside of the 2 nd housing through the at least 1 opening.

2. The impact tool of claim 1, wherein the impact tool comprises a plurality of blades,

the 2 nd shell comprises a 2 nd shell main body and a shell body, wherein,

the 2 nd housing body has the at least 1 opening,

the shell is fixedly connected with the 2 nd shell main body and is used for accommodating the controller,

the housing has a dividing wall and at least 1 guide, wherein,

the partition wall portion is separated from the 1 st housing and disposed between the controller and the 1 st housing;

The at least 1 guide part is configured to guide the at least 1 wire extending from the controller to the outside of the housing and to the at least 1 opening.

3. An impact tool as claimed in claim 1 or 2, characterized in that,

the 2 nd housing includes a 1 st part accommodating the controller and a 2 nd part connected with the 1 st part,

the at least 1 opening is at least 1 recess formed in the 1 st part at the connection end connected to the 2 nd part or the 2 nd part at the connection end connected to the 1 st part.

4. An impact tool as claimed in any one of claims 1 to 3, wherein,

and at least 1 battery mounting part, the at least 1 battery mounting part is configured to detachably mount a battery and arranged outside the 2 nd housing,

the at least 1 battery mounting portion having terminals capable of electrically connecting with terminals of the battery in response to mounting of the battery,

the at least 1 electric wire includes at least 1 terminal electric wire connected to the terminal.

5. The impact tool as claimed in any one of claims 1 to 4, wherein,

And at least 1 handle, the at least 1 handle has a holding part and is connected and fixed to the 2 nd shell at the outer side of the 2 nd shell,

the at least 1 handle at least partially covers the at least 1 wire outside the 2 nd housing.

6. The impact tool of claim 5, wherein the impact tool comprises a plurality of blades,

and a switch for starting the motor, wherein the switch is accommodated in the at least 1 handle,

the at least 1 wire includes a switch wire connected to the switch.

7. An impact tool as claimed in claim 5, or claim 6 when appended to claim 4, wherein,

the at least 1 handle is located between the controller and the at least 1 battery mounting portion in the 1 st direction.

8. The impact tool of claim 7, wherein the impact tool comprises a plurality of blades,

the at least 1 battery mounting portion includes a wall portion adjacent to the at least 1 handle and protruding outward from the 2 nd housing,

the terminal of the battery mounting portion is supported by the wall portion,

the terminal wire is connected to the terminal through an opening formed in the wall portion.

9. The impact tool as claimed in any one of claims 5 to 8, wherein,

the at least 1 handle includes 2 handles, the 2 handles being arranged on both sides of the 2 nd housing in a 2 nd direction orthogonal to the driving axis,

the grip portions of the 2 handles each extend along an axis extending in the 2 nd direction.

10. An impact tool as claimed in claim 9 when dependent directly or indirectly on claim 7, wherein,

the at least 1 battery mounting portion includes 2 battery mounting portions, the 2 battery mounting portions being disposed adjacent to the 2 handles on both sides of the 2 nd housing in the 2 nd direction, respectively,

the at least 1 opening includes 2 openings, the 2 openings being provided at both side portions of the 2 nd housing in the 2 nd direction,

the at least 1 terminal electric wire includes 2 terminal electric wires, which extend to the outside of the 2 nd housing through the 2 openings and are connected to the terminals of the 2 battery mounting portions, respectively.

11. Impact tool according to claim 9 or 10, characterized in that,

and a switch for starting the motor, wherein the switch is accommodated in one of the 2 handles,

The at least 1 wire extending from the controller includes a switch wire and a motor wire, wherein,

the switch is connected with the switch by an electric wire;

the motor wire is connected to a wire extending from the motor outside the 2 nd housing and inside the other of the 2 handles.

12. The impact tool of claim 11, wherein the impact tool comprises a plurality of blades,

the 2 nd housing has an inner wall,

a passage separated from the 1 st housing is defined in the 2 nd housing by the inner wall,

the electric wire extending from the motor extends through the passage toward the outside of the 2 nd housing.