Work machine

Abstract

To provide a technique which enables suppression of electric discharge occurring in a hand of a user due to static electricity without requiring electric connection between a control unit and the hand of the user.SOLUTION: A work machine comprises: a gripping member which a user holds by one hand; a protective member which comprises electrically conducting material and covers at least a part of the surface of the gripping member; an operation member which the user can operate by the one hand holding the gripping member; a detection sensor which detects operation regarding the operation member; and a control unit. The protective member may include a contact part getting inside the gripping member. The detection sensor may include a conductive component which is electrically connected with the control unit; and a sensor case consisting of insulation material which holds the conductive component. The contact part may contact the sensor case.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The technology disclosed in this specification relates to a work machine. [Background technology]

[0002] The working machine disclosed in Patent Document 1 includes a gripping member that a user grips with one hand, a protective member made of a conductive material that at least partially covers the surface of the gripping member, an operating member that the user can operate with the one hand, a detection sensor configured to detect an operation on the operating member, an air passage, a blower fan disposed in the air passage, an electric motor that rotates the blower fan, a conductive ring that surrounds the outer surface of the air passage, and a control unit that controls the operation of the electric motor. The detection sensor includes a conductive part electrically connected to the control unit, and a sensor case made of an insulating material that holds the conductive part. The protective member is electrically connected to the control unit and the conductive ring. In this working machine, the protective member made of a conductive material is in contact with the user's hand and is electrically connected to the control unit and the conductive ring, so that even if static electricity is generated during use of the working machine, the charge is quickly transferred to the user's hand via the protective member. With this configuration, it is possible to suppress discharge on the user's hand due to static electricity accumulating in the working machine. Furthermore, in this work machine, the conductive ring can be used to collect static electricity generated in the air passage. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Chinese Patent No. 106284150 Summary of the Invention [Problem to be solved by the invention]

[0004] Typically, the control unit of a work machine is electrically connected to a power source that supplies power to the work machine. When the protective member that comes into contact with the user's hand is made of a conductive material and is electrically connected to the control unit, as in the work machine of Patent Document 1, the power source that supplies power to the work machine and the user's hand are electrically connected, which may result in electric shock. This specification provides a technology that can suppress discharge to the user's hand due to static electricity without electrically connecting the control unit and the user's hand.

[0005] In addition, in the work machine of Patent Document 1, a conductive ring is used to collect the static electricity generated in the air duct. This specification also provides a technology that can collect the static electricity generated in the air duct with a simpler configuration. [Means for solving the problem]

[0006] The working machine disclosed in this specification may include a gripping member that a user grips with one hand, a protective member at least partially covering a surface of the gripping member and made of a conductive material, an operating member that the user can operate with the one hand, a detection sensor configured to detect an operation on the operating member, and a control unit. The protective member may include an abutment portion that is recessed inside the gripping member. The detection sensor may include a conductive part electrically connected to the control unit, and a sensor case that holds the conductive part and is made of an insulating material. The abutment portion may abut against the sensor case.

[0007] According to the above configuration, the protective member that comes into contact with the user's hand is made of a conductive material, and the contact portion of the protective member contacts the sensor case. When static electricity accumulates in the work machine, a discharge occurs between the conductive part of the detection sensor and the contact portion of the protective member, and the charge moves from the protective member to the user's hand. This makes it possible to prevent discharge to the user's hand due to static electricity without electrically connecting the control unit and the user's hand. In addition, in the above configuration, since the contact portion contacts the sensor case, the distance between the contact portion and the conductive part is less likely to vary, and stable discharge characteristics can be achieved between the contact portion and the conductive part.

[0008] Another working machine disclosed in this specification may include a gripping member that a user grips with one hand, a protective member that at least partially covers a surface of the gripping member and is made of a conductive material, an air passage, a blower fan disposed in the air passage, an electric motor that rotates the blower fan, and wiring that is connected to the electric motor and extends in a circumferential direction over 90° or more along an outer surface of the air passage. Static electric charges generated in the air passage may be collected by the wiring and transferred from the protective member to the one hand of the user.

[0009] According to the above configuration, the static electricity generated in the air passage can be collected by using the wiring connected to the electric motor without using a special member such as a conductive ring. Note that, in this configuration, the wiring extending in the circumferential direction along the outer surface of the air passage and the protective member may be electrically connected, or an insulating portion may be present between the wiring extending in the circumferential direction along the outer surface of the air passage and the protective member, and discharge may occur at the insulating portion. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view showing the overall appearance of a blower 10 according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a perspective view of the blower unit 16 of the embodiment as viewed from above on the front left. [Diagram 3]2 is a vertical cross-sectional view of the vicinity of a housing 28 of the blower unit 16 of the embodiment. FIG. [Figure 4] 1 is a perspective view of the vicinity of a grip unit 38 of the blower unit 16 of the embodiment, as viewed from above on the rear left side. FIG. [Diagram 5] 1 is a perspective view showing the internal configuration of a grip unit 38 of a blower unit 16 of the embodiment, as viewed from above on the front right. [Figure 6] 4 is a cross-sectional view of the grip unit 38 of the blower unit 16 of the embodiment. FIG. [Figure 7] 2 is a perspective view showing the internal configuration of the housing 28 of the blower unit 16 of the embodiment, as viewed from below and rear left. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Representative and non-limiting examples of the present invention are described in detail below with reference to the drawings. This detailed description is intended simply to provide those skilled in the art with details for implementing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Additionally, the additional features and inventions disclosed can be used separately or together with other features and inventions to provide further improved working machines.

[0012] In addition, the combinations of features and steps disclosed in the following detailed description are not essential for implementing the present invention in the broadest sense, but are specifically described only to illustrate representative embodiments of the present invention. Furthermore, the various features of the following representative embodiments and the various features described in the claims do not have to be combined in the exact manner of the embodiments described herein or in the order listed in order to provide additional and useful embodiments of the present invention.

[0013] All features described in the specification and / or claims are intended to be disclosed individually and independently of one another as limitations to the specific features described in the original disclosure and claims, apart from the configuration of features described in the examples and / or claims. Furthermore, all numerical ranges and group or aggregate descriptions are intended to disclose intermediate configurations thereof as limitations to the specific features described in the original disclosure and claims.

[0014] In one or more embodiments, the working machine may include a gripping member that a user grips with one hand, a protective member at least partially covering a surface of the gripping member and made of a conductive material, an operating member that the user can operate with the one hand, a detection sensor configured to detect an operation on the operating member, and a control unit. The protective member may include an abutment portion that is recessed inside the gripping member. The detection sensor may include a conductive part electrically connected to the control unit, and a sensor case that holds the conductive part and is made of an insulating material. The abutment portion may abut against the sensor case.

[0015] In one or more embodiments, the implement may be configured to be held by the user and used off the ground.

[0016] In the above-mentioned working machine, the charge due to static electricity generated during use of the working machine is difficult to move to the ground, so the charge due to static electricity is likely to accumulate inside the working machine. According to the above-mentioned configuration, in the working machine in which static electricity is likely to accumulate, it is possible to prevent discharge to the user's hand due to static electricity without electrically connecting the control unit and the user's hand.

[0017] In one or more embodiments, the work machine may further include an air duct, a blower fan disposed in the air duct, and a prime mover that rotates the blower fan. The control unit may be configured to control an operation of the prime mover.

[0018] In such a work machine, charges due to static electricity originally present on fine particles in the air flowing inside the work machine and charges due to static electricity generated when the fine particles rub against components of the work machine tend to accumulate inside the work machine. With the above configuration, in a work machine in which static electricity tends to accumulate, it is possible to prevent discharge to the user's hand due to static electricity without electrically connecting the control unit and the user's hand.

[0019] In one or more embodiments, a wire connecting the control unit and the detection sensor may extend circumferentially over an angle of 90° or more along an outer surface of the air passage.

[0020] According to the above configuration, the static electricity generated in the air passage can be collected by using the wiring connecting the control unit and the detection sensor, without using a special member such as a conductive ring.

[0021] In one or more embodiments, a wire connecting the control unit and a power source may extend circumferentially over 90° or more along an outer surface of the air passage.

[0022] According to the above configuration, the static electricity generated in the air passage can be collected by using the wiring connecting the control unit and the power source, without using a special member such as a conductive ring.

[0023] In one or more embodiments, the prime mover may be an electric motor, and the control unit may be configured to control operation of the electric motor by controlling power supplied to the electric motor.

[0024] In a work machine using an electric motor as a prime mover, a large amount of power is supplied from a power source, so it is necessary to reliably prevent the user from getting an electric shock. According to the above configuration, since the control unit and the user's hand are not electrically connected, it is possible to reliably prevent the user from getting an electric shock while suppressing discharge to the user's hand due to static electricity.

[0025] In one or more embodiments, a wire connecting the control unit and the electric motor may extend circumferentially over an angle of 90° or more along an outer surface of the air passage.

[0026] According to the above configuration, the static electricity generated in the air passage can be collected by using the wiring connecting the control unit and the electric motor, without using a special member such as a conductive ring.

[0027] In one or more embodiments, the working machine may include a gripping member that is gripped by a user with one hand, a protective member that at least partially covers a surface of the gripping member and is made of a conductive material, an air passage, a blower fan disposed in the air passage, an electric motor that rotates the blower fan, and wiring that is connected to the electric motor and extends in a circumferential direction over 90° or more along an outer surface of the air passage. Static electric charges generated in the air passage may be collected by the wiring and transferred from the protective member to the one hand of the user.

[0028] (Example) 1, blower 10 includes a backpack unit 12, a battery unit 14, and a blower unit 16. Backpack unit 12 includes a backpack frame 18, a pair of shoulder belts 20 attached to backpack frame 18, and a waist belt 22 attached to backpack frame 18. A user can carry backpack unit 12 on his / her back with the pair of shoulder belts 20 placed over the shoulders and the waist belt 22 wrapped around the waist.

[0029] The battery unit 14 is detachably attached to the backpack frame 18. The battery unit 14 houses multiple battery cells (not shown). The battery unit 14 includes a power button 24, a charging connector (not shown), and a discharging cable 26. The multiple battery cells can be charged from an external power source (not shown) by connecting a charging cable (not shown) extending from the external power source to the charging connector. The power button 24 switches the power of the battery unit 14 between on and off. The multiple battery cells can be discharged via the discharging cable 26 when the power of the battery unit 14 is on.

[0030] As shown in FIG. 2, the blower unit 16 includes a housing 28 and a power cable 30. The housing 28 includes a cylindrical portion 28a formed in a substantially cylindrical shape, an expanded diameter portion 28b connected to one end of the cylindrical portion 28a in the central axis direction and having a shape in which the diameter expands as it moves away from the cylindrical portion 28a, a frame attachment portion 28c protruding outward from the outer surface of the cylindrical portion 28a, a cable holding portion 28d protruding outward from the outer surface of the cylindrical portion 28a and the outer surface of the expanded diameter portion 28b, and a control unit accommodating portion 28e protruding outward from the outer surface of the cylindrical portion 28a. The housing 28 is detachable from the backpack frame 18 (see FIG. 1) via the frame attachment portion 28c. The power cable 30 extends from the cable holding portion 28d and is connected to the discharge cable 26 (see FIG. 1). The blower unit 16 operates by power supplied from the battery unit 14 (see FIG. 1) via the discharge cable 26 and the power cable 30. In the following description, the direction in which the central axis of the cylindrical portion 28a of the housing 28 extends is referred to as the front-rear direction, the direction of the enlarged diameter portion 28b as viewed from the cylindrical portion 28a is referred to as the rear direction, and the opposite direction to the rear direction is referred to as the front direction. In addition, the direction of the cable holding portion 28d as viewed from the central axis of the cylindrical portion 28a, which is perpendicular to the front-rear direction, is referred to as the upward direction, and the opposite direction to the upward direction is referred to as the downward direction. In addition, the direction perpendicular to the front-rear direction and the up-down direction is referred to as the left-right direction. The frame attachment portion 28c is disposed on the outer surface of the left side of the cylindrical portion 28a, the cable holding portion 28d is disposed on the outer surfaces of the upper sides of the cylindrical portion 28a and the enlarged diameter portion 28b, and the control unit accommodating portion 28e is disposed on the outer surface of the lower side of the cylindrical portion 28a. In addition, the power cable 30 extends rearward from the rear surface of the cable holding portion 28d.

[0031] The blower unit 16 further includes a bellows tube 32, a straight tube 34, a tip nozzle 36, a grip unit 38, and a signal cable 40. The bellows tube 32 is made of an insulating material (e.g., elastic resin). The straight tube 34 and the tip nozzle 36 are made of an insulating material (e.g., plastic). The bellows tube 32 connects the front part of the cylindrical part 28a of the housing 28 to the rear part of the straight tube 34. The tip nozzle 36 is attached to the front part of the straight tube 34 and has a nozzle 36a at its tip. The grip unit 38 includes an attachment part 38a, a grip part 38b, and a tip part 38c. The attachment part 38a is attached to the straight tube 34 so as to surround the outer periphery of the straight tube 34. The grip part 38b extends forward and upward from an upper part of the attachment part 38a. The tip part 38c extends forward from the upper end of the grip part 38b. The signal cable 40 extends forward from the front surface of the cable holding portion 28d of the housing 28, and is connected to the rear surface of the upper part of the mounting portion 38a of the grip unit 38. The user can adjust the direction in which the nozzle 36a of the tip nozzle 36 is pointed by adjusting the attitude of the straight tube 34 while holding the grip portion 38b.

[0032] As shown in FIG. 3, the blower unit 16 further includes an intake cover 42, a soundproofing member 44, a motor case 46, a blower duct 48, a blower fan 50, an electric motor 52, a diffuser cone 54, and a control unit 56. The intake cover 42, the motor case 46, the blower duct 48, the blower fan 50, and the diffuser cone 54 are made of an insulating material (e.g., plastic). An intake passage 28f is formed inside the expanded diameter portion 28b of the housing 28. The intake passage 28f has a shape that expands in diameter from the front to the rear. An intake port 28g is formed at the rear end of the intake passage 28f. The intake cover 42 is formed in a lattice shape having walls extending in the radial and circumferential directions. The intake cover 42 is attached so as to cover the intake port 28g of the housing 28. The soundproofing member 44 is attached to the inner surface of the intake passage 28f.

[0033] The motor case 46 is accommodated inside the cylindrical portion 28a of the housing 28. The blower tube 48 is held in the housing 28 so as to protrude forward from the front end of the cylindrical portion 28a, further forward than the motor case 46. The portion of the blower tube 48 protruding from the housing 28 is surrounded by the bellows tube 32.

[0034] The motor case 46 includes an outer case 46a having a substantially cylindrical shape, an inner case 46b having a substantially cylindrical shape disposed inside the outer case 46a, and a stator blade portion 46c connecting the outer case 46a and the inner case 46b. The central axis of the outer case 46a and the central axis of the inner case 46b are both coaxial with the central axis of the cylindrical portion 28a. The inner case 46b has a smaller diameter than the outer case 46a and is shorter in the central axis direction than the outer case 46a. The diffuser cone 54 is attached to the front end of the inner case 46b and is disposed so as to protrude forward from the front end of the outer case 46a. The front part of the diffuser cone 54 is disposed inside the blower duct 48.

[0035] The blower fan 50 is disposed inside the outer case 46a and rearward of the inner case 46b. The electric motor 52 is housed inside the inner case 46b. In this embodiment, the electric motor 52 is, for example, a brushless motor. The electric motor 52 includes a stator 52b around which a coil 52a is wound, a rotor 52d disposed inside the stator 52b and having a permanent magnet 52c, a sensor board 52f on which a Hall sensor 52e for detecting the magnetism of the permanent magnet 52c is mounted, and an output shaft 52g fixed to the rotor 52d and extending in the front-rear direction. The blower fan 50 is fixed to the rear end of the output shaft 52g. Therefore, the output shaft 52g is rotated by the drive of the electric motor 52, and the blower fan 50 is rotated.

[0036] When the blower fan 50 rotates, air outside the blower unit 16 passes through the intake cover 42 and is sucked into the intake port 28g. The air sucked from the intake port 28g passes through the intake passage portion 28f and flows into the inside of the motor case 46. The air then passes through the blower fan 50, flows through the space between the outer case 46a and the inner case 46b, is rectified by the stationary blade portion 46c, and then flows out of the motor case 46 and into the inside of the blower duct 48. The air then passes through the inside of the bellows tube 32 and the straight tube 34 shown in FIG. 2, and is then ejected from the ejection port 36a at the tip of the tip nozzle 36.

[0037] As shown in FIG. 3, the control unit 56 is accommodated in the control unit accommodating portion 28e of the housing 28. The control unit 56 includes a control circuit board 56a and a circuit board case 56b that accommodates the control circuit board 56a. The control circuit board 56a includes a CPU, a ROM, a RAM, and the like, and includes a microcomputer (not shown) that controls the overall operation of the blower unit 16, and an inverter circuit (not shown) that controls the operation of the electric motor 52 by controlling the power supplied to the electric motor 52. The control circuit board 56a and the electric motor 52 are electrically connected via a motor wiring 52h that passes through a wiring space 46d (see FIG. 7) formed inside one of the stationary blade portions 46c. In this embodiment, the motor wiring 52h includes both a wiring (not shown) connected to the coil 52a and a wiring (not shown) connected to the sensor board 52f. In addition, when the electric motor 52 is a motor other than a brushless motor (for example, a brush motor) and does not include the sensor board 52f, the motor wiring 52h includes only a wiring (not shown) connected to the coil 52a. Moreover, the control circuit board 56a is electrically connected to the power wiring 30a extending from inside the power cable 30. A cooling opening 46e is formed in the lower part of the outer case 46a, and a part of the circuit board case 56b is exposed to the inside of the outer case 46a through the cooling opening 46e. Therefore, when the blower fan 50 rotates, the control unit 56 is cooled by air flowing through the space between the outer case 46a and the inner case 46b.

[0038] As shown in Fig. 4, the grip unit 38 includes a right grip case 38d and a left grip case 38e. The right grip case 38d and the left grip case 38e are made of an insulating material (e.g., plastic). The right grip case 38d defines the outer shape of the right half of the mounting portion 38a, the grip portion 38b, and the tip portion 38c. The left grip case 38e defines the outer shape of the left half of the mounting portion 38a, the grip portion 38b, and the tip portion 38c.

[0039] The grip portion 38b is provided with a trigger lever 58 arranged on the front of the upper portion of the grip portion 38b. The tip portion 38c is provided with a control lever 60 arranged on the left surface of the tip portion 38c, a first display operation panel 62 arranged on the rear surface of the tip portion 38c, and a second display operation panel 64 arranged on the upper surface of the tip portion 38c. The first display operation panel 62 includes a power button 62a, a status indicator light 62b, a circuit board (not shown), and a panel case 62c. The power button 62a switches the power of the blower unit 16 between on and off. The status indicator light 62b notifies the user of the power of the blower unit 16, such as the on and off state. The panel case 62c is made of an insulating material (e.g., plastic), and houses the power button 62a, the status indicator light 62b, and the circuit board. The circuit board of the first display operation panel 62 is electrically connected to the control circuit board 56a of the control unit 56 via a signal wiring 62d. The second display / operation panel 64 includes a battery level display button 64a, a battery level indicator light 64b, a circuit board (not shown), and a panel case 64c. The battery level display button 64a switches the battery level indicator light 64b on / off. The battery level indicator light 64b notifies the user of the remaining battery level of the battery unit 14. The panel case 64c is made of an insulating material (e.g., plastic) and houses the battery level display button 64a, the battery level indicator light 64b, and the circuit board. The circuit board of the second display / operation panel 64 is electrically connected to the control circuit board 56a of the control unit 56 via a signal wiring 64d. The signal wirings 62d and 64d extend from the grip unit 38 to the housing 28 through the inside of the signal cable 40.

[0040] As shown in FIG. 5, the trigger lever 58 is rotatably supported by a boss 38f extending leftward from the left grip case 38e. The trigger lever 58 is made of an insulating material (e.g., plastic). The trigger lever 58 includes an operating portion 58a, a first detection portion 58b, a second detection portion 58c, and an engagement portion 58d. The trigger lever 58 is biased by a torsion spring 66 in a rotation direction in which the operating portion 58a faces forward. A first trigger switch 68 is accommodated inside the grip portion 38b. The first trigger switch 68 includes a switch lever 68a, a switch button 68b, and a switch case 68c. The first trigger switch 68 outputs an OFF signal when the switch lever 68a is separated from the switch button 68b, and outputs an ON signal when the switch lever 68a is in contact with the switch button 68b. The switch case 68c is made of an insulating material (e.g., plastic) and holds the switch lever 68a and the switch button 68b. The switch lever 68a and the switch button 68b are both conductive parts and are electrically connected to the control circuit board 56a of the control unit 56 via a signal wiring 68d. A second trigger switch 70 is housed inside the tip portion 38c. The second trigger switch 70 includes a switch button 70a and a switch case 70b. The second trigger switch 70 outputs a signal indicating the amount of depression of the switch button 70a. The switch case 70b is made of an insulating material (e.g., plastic) and holds the switch button 70a. The switch button 70a is a conductive part and is electrically connected to the control circuit board 56a of the control unit 56 via a signal wiring 70c. The signal wirings 68d and 70c extend from the grip unit 38 to the housing 28 through the inside of the signal cable 40 (see FIG. 4).

[0041] The operation unit 58a is disposed outside the grip unit 38b and receives a pressing operation from the user. The first detection unit 58b is disposed facing the switch lever 68a of the first trigger switch 68, and is separated from the switch lever 68a when the pressing amount of the operation unit 58a is less than a predetermined amount, and is brought into contact with the switch lever 68a when the pressing amount of the operation unit 58a is equal to or greater than the predetermined amount, causing the switch lever 68a to press against the switch button 68b. The second detection unit 58c is disposed facing the switch button 70a of the second trigger switch 70, and is separated from the switch button 70a when the operation unit 58a is not pressed, and is brought into contact with the switch button 70a when the operation unit 58a is pressed, causing the switch button 70a to press. Thus, the first trigger switch 68 can detect whether the trigger lever 58 is pressed, and the second trigger switch 70 can detect the pressing amount of the trigger lever 58.

[0042] The engaging portion 58d is disposed opposite to an engaging piece 60a fixed to a control lever 60 (see FIG. 4). The control lever 60 accepts a rotational operation from the user and holds the rotation angle operated by the user. When the control lever 60 rotates, the engaging portion 58d is pushed upward, so that the trigger lever 58 rotates in the same manner as when the operating portion 58a is pushed backward. The rotation angle of the control lever 60 is held as it is even if the user releases his / her hand, so that by rotating the control lever 60, the trigger lever 58 can be held in the same state as when the operating portion 58a is pushed in by a predetermined amount.

[0043] As shown in FIG. 4, a front protective member 72 and a rear protective member 74 are attached to the outer surface of the grip portion 38b. The front protective member 72 and the rear protective member 74 are made of a conductive material, for example, a conductive elastomer. The front protective member 72 covers the front surface of the grip portion 38b, and the rear protective member 74 covers the rear surface of the grip portion 38b. In this embodiment, a part of the surface of the grip portion 38b is exposed between the front protective member 72 and the rear protective member 74, but the surface of the grip portion 38b may be completely covered by the front protective member 72 and the rear protective member 74.

[0044] 6, a through hole 38g is formed in the right grip case 38d of the grip portion 38b. In addition, an abutment portion 72a is formed in the front protective member 72, which penetrates the through hole 38g and enters the inside of the grip portion 38b. An end of the abutment portion 72a abuts against the switch case 68c of the first trigger switch 68.

[0045] As shown in Fig. 7, inside the housing 28, the power wiring 30a extending from the power cable 30 extends from the cable holding portion 28d above the outer case 46a to the control unit 56 below the outer case 46a along the left outer surface of the outer case 46a. Also, inside the housing 28, the signal wiring 62d, 64d, 68d, 70c extending from the signal cable 40 extends from the cable holding portion 28d above the outer case 46a to the control unit 56 below the outer case 46a along the left outer surface of the outer case 46a. Furthermore, inside the housing 28, the motor wiring 52h extending from the electric motor 52 extends from the wiring space 46d of the stator blade portion 46c along the left outer surface of the outer case 46a to the upper part of the outer case 46a, then extends along the left outer surface of the outer case 46a to the lower part of the outer case 46a and is connected to the control unit 56.

[0046] When the blower 10 is used to blow air, static charges, which are originally charged on particles in the air flowing inside the blower 10, and static charges generated when the particles rub against components of the blower 10, accumulate in the motor case 46. The static charges are collected by the power wiring 30a, the signal wirings 62d, 64d, 68d, 70c, and the motor wiring 52h, which extend along the outer surface of the outer case 46a. The static charges increase the potentials of the first display / operation panel 62, the second display / operation panel 64, the first trigger switch 68, and the second trigger switch 70 of the grip unit 38, which are connected to the signal wirings 62d, 64d, 68d, and 70c. In this embodiment, the contact portion 72a of the front protection member 72, which is in contact with the user's hand, contacts the switch case 68c of the first trigger switch 68. As a result, discharge occurs from the switch lever 68a or the switch button 68b of the first trigger switch 68 to the contact portion 72a of the front protection member 72, and the static charge is transferred from the front protection member 72 to the user's hand. Since the discharge occurs inside the grip unit 38, not on the surface of the user's hand, the static electricity built up inside the blower 10 can be discharged to the outside without causing discomfort to the user.

[0047] In order to collect the electric charge accumulated in the motor case 46, any one of the power wiring 30a, the signal wiring 62d, 64d, 68d, 70c, and the motor wiring 52h may extend in the circumferential direction over 90° or more along the outer surface of the outer case 46a. The power wiring 30a, the signal wiring 62d, 64d, 68d, 70c, and / or the motor wiring 52h may extend over a range of, for example, 90° or more, for example, 120° or more, or for example, 180° or more. The wider the range over which the power wiring 30a, the signal wiring 62d, 64d, 68d, 70c, and / or the motor wiring 52h extend, the more reliably the electric charge accumulated in the motor case 46 can be collected.

[0048] (Modification) In the above embodiment, the working machine is the blower 10. However, the working machine may be a cleaner, a dust collector, a vacuum blower, or the like.

[0049] In the above embodiment, the blower 10 is a backpack type blower. In another embodiment, the blower 10 may be a blower other than a backpack type blower. For example, the blower 10 may be a handheld blower or the like.

[0050] In the above embodiment, the power source for the blower 10 is the battery unit 14, and a configuration has been described in which power is supplied from the battery unit 14 to the blower unit 16. Alternatively, the power source for the blower 10 may be an external power source (not shown) that is not worn by the user, and a configuration in which power is supplied from the external power source to the blower unit 16 may be adopted. Alternatively, the power source for the blower 10 may be a battery pack (not shown) that is detachable from the blower unit 16, and a configuration in which power is supplied from the battery pack to the blower unit 16 may be adopted.

[0051] In the above embodiment, a configuration has been described in which the prime mover of the blower 10 is the electric motor 52, and the blower fan 50 is rotated by the power of the electric motor 52. Alternatively, the prime mover of the blower 10 may be an internal combustion engine (not shown), and the blower fan 50 may be rotated by the power of the internal combustion engine.

[0052] In the above embodiment, a description has been given of a case where the electric motor 52 is a brushless motor. However, the electric motor 52 may be a brush motor or another type of motor.

[0053] In the above embodiment, a configuration has been described in which the abutment portion 72a of the front protective member 72 abuts against the switch case 68c of the first trigger switch 68. Alternatively, the abutment portion 72a of the front protective member 72 may abut against the switch case 70b of the second trigger switch 70, may abut against the panel case 62c of the first display / operation panel 62, or may abut against the panel case 64c of the second display / operation panel 64. Also, instead of the abutment portion 72a of the front protective member 72, the rear protective member 74 may have an abutment portion (not shown).

[0054] (Correspondence) As described above, in one or more embodiments, the blower 10 (an example of a working machine) includes the grip unit 38 (an example of a gripping member) that the user grips with one hand, the front protective member 72 (an example of a protective member) that at least partially covers the surface of the grip unit 38 and is made of a conductive elastomer (an example of a conductive material), the trigger lever 58 (an example of an operating member) that the user can operate with one hand, the first trigger switch 68 (an example of a detection sensor) that is configured to detect an operation on the trigger lever 58, and the control unit 56. The front protective member 72 includes a contact portion 72a that is recessed into the grip unit 38. The first trigger switch 68 includes a switch lever 68a and a switch button 68b (an example of a conductive part) that are electrically connected to the control unit 56, and a switch case 68c (an example of a sensor case) that holds the switch lever 68a and the switch button 68b and is made of plastic (an example of an insulating material). The contact portion 72a contacts the switch case 68c.

[0055] According to the above configuration, the front protection member 72 that comes into contact with the user's hand is made of a conductive elastomer, and the contact portion 72a of the front protection member 72 contacts the switch case 68c. When static electricity accumulates in the blower 10, a discharge occurs between the switch lever 68a and the switch button 68b of the first trigger switch 68 and the contact portion 72a of the front protection member 72, and the charge moves from the front protection member 72 to the user's hand. This makes it possible to prevent discharge to the user's hand due to static electricity without electrically connecting the control unit 56 to the user's hand. In addition, in the above configuration, since the contact portion 72a contacts the switch case 68c, the distance between the contact portion 72a and the switch lever 68a and the switch button 68b is unlikely to vary, and stable discharge characteristics can be achieved between the contact portion 72a and the switch lever 68a and the switch button 68b.

[0056] In one or more embodiments, the blower 10 is configured to be held by a user and used off the ground.

[0057] In the blower 10 described above, static electricity generated during use does not easily move to the ground, and so the static electricity tends to accumulate inside the blower 10. With the above configuration, in the blower 10 in which static electricity tends to accumulate, it is possible to prevent discharge to the user's hand due to static electricity without electrically connecting the control unit 56 and the user's hand.

[0058] In one or more embodiments, the blower 10 further includes a motor case 46 (an example of an air passage), a blower fan 50 disposed within the motor case 46, and an electric motor 52 (an example of a prime mover) that rotates the blower fan 50. The control unit 56 is configured to control the operation of the electric motor 52.

[0059] In the blower 10 described above, static electricity that is originally present on fine particles in the air flowing inside the blower 10 and static electricity that is generated when the fine particles rub against components of the blower 10 tend to accumulate inside the blower 10. With the above configuration, in a blower 10 in which static electricity tends to accumulate, it is possible to prevent discharge of static electricity to the user's hands without electrically connecting the control unit 56 and the user's hands.

[0060] In one or more embodiments, a signal wire 68d (an example of a wire) connecting the control unit 56 and the first trigger switch 68 extends circumferentially along the outer surface of the motor case 46 over an angle of 90° or more.

[0061] According to the above configuration, the static electricity generated in the motor case 46 can be collected by using the signal wire 68d that connects the control unit 56 and the first trigger switch 68, without using a special member such as a conductive ring.

[0062] In one or more embodiments, power wiring 30a (an example of wiring) connecting control unit 56 and battery unit 14 (an example of a power source) extends circumferentially along the outer surface of motor case 46 for 90° or more.

[0063] According to the above configuration, the static electricity generated in the motor case 46 can be collected by using the power wiring 30a connecting the control unit 56 and the battery unit 14, without using a special member such as a conductive ring.

[0064] In one or more embodiments, the control unit 56 is configured to control the operation of the electric motor 52 by controlling the power provided to the electric motor 52 .

[0065] In the blower 10 that uses the electric motor 52 as a prime mover, a large amount of power is supplied from the battery unit 14, and therefore it is necessary to reliably prevent the user from getting an electric shock. With the above-described configuration, the control unit 56 and the user's hand are not electrically connected, so that it is possible to reliably prevent the user from getting an electric shock while suppressing discharge to the user's hand due to static electricity.

[0066] In one or more embodiments, motor wiring 52h (an example of wiring) connecting control unit 56 and electric motor 52 extends circumferentially along the outer surface of motor case 46 over an angle of 90° or more.

[0067] According to the above configuration, the static electricity generated in the motor case 46 can be collected by using the motor wiring 52h that connects the control unit 56 and the electric motor 52, without using a special member such as a conductive ring.

[0068] In one or more embodiments, the blower 10 (an example of a work machine) includes a grip unit 38 (an example of a gripping member) that a user holds with one hand, a front protective member 72 (an example of a protective member) that at least partially covers a surface of the grip unit 38 and is made of a conductive elastomer (an example of a conductive material), a motor case 46 (an example of an air passage), a blower fan 50 disposed within the motor case 46, an electric motor 52 that rotates the blower fan 50, and a motor wiring 52h (an example of wiring) that is connected to the electric motor 52 and extends circumferentially over 90° or more along the outer surface of the motor case 46. Static electric charges generated in the motor case 46 are collected by the motor wiring 52h and transferred from the front protective member 72 to one hand of the user.

[0069] According to the above configuration, the static electricity generated in the motor case 46 can be collected by using the motor wiring 52h connected to the electric motor 52, without using a special member such as a conductive ring. [Explanation of symbols]

[0070] 10: Blower 12: Backpack unit 14: Battery unit 16: Blower unit 18: Backpack frame 20: Shoulder belt 22: Waist belt 24: Power button 26: Discharge cable 28: Housing 28a: Cylindrical section 28b: Expanded diameter part 28c: Frame mounting part 28d: Cable holding part 28e: Control unit housing 28f: Intake passage 28g : Air intake 30: Power cable 30a: Power wiring 32: Bellows tube 34: Straight pipe 36: Tip nozzle 36a: spout 38: Grip unit 38a: Mounting part 38b: Grip section 38c:Tip 38d: Right side grip case 38e: Left side grip case 38f: Boss 38g:Through hole 40: Signal cable 42: Intake cover 44: Soundproofing materials 46: Motor case 46a: Outer case 46b: Inner case 46c:Stator blade part 46d: Wiring space 46e: Cooling opening 48:Blow pipe 50: Blower fan 52: Electric motor 52a: Coil 52b: Stator 52c: Permanent magnet 52d: Rotor 52e: Hall sensor 52f: Sensor board 52g: Output shaft 52h: Motor wiring 54: Diffuser cone 56: Control unit 56a: Control circuit board 56b: Circuit board case 58: Trigger lever 58a: Operation section 58b: First detection unit 58c: Second detection section 58d: Engagement part 60: Control lever 60a: Engagement piece 62: 1st display operation panel 62a: Power button 62b: Status indicator light 62c: Panel case 62d: Signal wiring 64: Second display operation panel 64a: Battery level display button 64b: Battery level indicator 64c: Panel case 64d: Signal wiring 66: Spring 68: First trigger switch 68a: Switch lever 68b: Switch button 68c: Switch case 68d: Signal wiring 70: Second trigger switch 70a: Switch button 70b: Switch case 70c: Signal wiring 72: Front protection member 72a: Contact part 74: Rear protective member

Claims

1. A work machine, A gripping member that is held by a user with one hand; a protective member at least partially covering a surface of the gripping member and made of a conductive material; an operating member that can be operated by the user with one hand; A detection sensor configured to detect an operation of the operating member; It has a control unit, The protective member has an abutment portion that is inserted into the gripping member, The detection sensor is A conductive part electrically connected to the control unit; a sensor case that holds the conductive part and is made of an insulating material; The abutment portion abuts against the sensor case.

2. The work implement of claim 1 , configured to be held by the user and used off the ground.

3. An air duct; A blower fan disposed in the air passage; The device further includes a prime mover for rotating the blower fan, 3. The work machine of claim 1 or 2, wherein the control unit is configured to control operation of the prime mover.

4. 4. The work machine according to claim 3, wherein a wiring connecting the control unit and the detection sensor extends in a circumferential direction over an angle of 90 degrees or more along an outer surface of the air passage.

5. 5. The work machine according to claim 3 or 4, wherein a wiring connecting the control unit and a power source extends circumferentially over an angle of 90 degrees or more along an outer surface of the air passage.

6. The prime mover is an electric motor, 6. The work machine according to claim 3, wherein the control unit is configured to control an operation of the electric motor by controlling power supplied to the electric motor.

7. 7. The work machine according to claim 6, wherein a wiring connecting the control unit and the electric motor extends circumferentially over an angle of 90 degrees or more along an outer surface of the air passage.

8. A work machine, A gripping member that is held by a user with one hand; a protective member at least partially covering a surface of the gripping member and made of a conductive material; An air duct; A blower fan disposed in the air passage; an electric motor that rotates the blower fan; A wiring is connected to the electric motor and extends circumferentially over 90° or more along an outer surface of the air passage, A work machine in which static electricity generated in the air passage is collected by the wiring and transferred from the protective member to the one hand of the user.

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