Grounding body and lawn mower with grounding body

Abstract

Provided are a ground contact and a mower provided with the ground contact. A novel and useful configuration is provided for a ground contact that is mounted to a cutting blade shaft of a mower. The ground contact is mounted to the cutting blade shaft of the mower. The ground contact includes a mounting portion for mounting the ground contact to the cutting blade shaft of the mower, and a main body portion that is joined to the mounting portion and contacts the ground. In the cutting blade shaft, a cutting blade is mounted at a position that is higher than the ground contact. The main body portion has a first main body portion that is formed of a first resin, and a second main body portion that is formed of a second resin that is different from the first resin.

Description

Technical Field

[0001] The technology disclosed in this specification relates to grounding electrodes and lawnmowers equipped with grounding electrodes. Background Technology

[0002] Patent Document 1 discloses a grounding electrode. This grounding electrode includes: a mounting portion for mounting the grounding electrode to the cutting blade shaft of a lawnmower, wherein a cutting blade is mounted on the cutting blade shaft at a position above the grounding electrode; and a main body portion connected to the mounting portion and in contact with the ground. The main body portion is formed of a resin.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2008-35731 Summary of the Invention

[0006] The problem the invention aims to solve

[0007] The main body of the grounding electrode in Patent Document 1 is formed of a resin. When the main body is formed of a resin, it is difficult to improve the user's visual recognition and the quietness of the lawnmower equipped with the grounding electrode.

[0008] This specification provides a novel and useful construction for the grounding electrode of the cutting blade shaft installed on a lawnmower.

[0009] Solution for solving the problem

[0010] This specification discloses a grounding electrode installed on the cutting blade shaft of a lawnmower. The grounding electrode includes: a mounting portion for mounting the grounding electrode to the cutting blade shaft, wherein a cutting blade is mounted on the cutting blade shaft at a position above the grounding electrode; and a main body portion connected to the mounting portion and in contact with the ground, the main body portion having a first main body portion formed of a first resin and a second main body portion formed of a second resin different from the first resin.

[0011] According to the above structure, the main body has a first main body part formed of a first resin and a second main body part formed of a second resin. By using two resins to form the main body, compared to the case where the main body is made of a single resin, it is possible to improve the user's visual visibility or improve the quietness of the lawnmower. Here, the resin described in this specification includes not only plastics with relatively high hardness, but also thermosetting or thermoplastic elastomers and rubbers with lower hardness.

[0012] Furthermore, this specification discloses a lawnmower. Alternatively, the lawnmower may include: a control lever; a cutting shaft disposed at the front of the control lever; a cutting blade mounted on the cutting shaft; and a grounding electrode mounted on the cutting shaft at a position lower than the cutting blade, in contact with the ground. The grounding electrode includes: a mounting portion for mounting the grounding electrode to the cutting shaft; and a main body portion connected to the mounting portion, in contact with the ground. The main body portion has a first main body portion formed of a first resin and a second main body portion formed of a second resin different from the first resin.

[0013] According to the above structure, the main body of the grounding electrode has a first main body formed of a first resin and a second main body formed of a second resin. By using two types of resin to form the main body, compared to the case where the main body is made of only one type of resin, it is possible to improve the user's visual visibility or improve the quietness of the lawnmower. Attached Figure Description

[0014] Figure 1 This is a right-side view of the lawnmower 2 of the first embodiment, viewed from the right.

[0015] Figure 2 This is a right-side cross-sectional view of the grounding body 46 in the first embodiment.

[0016] Figure 3 This is a perspective view of the grounding body 46 of the first embodiment, viewed from the upper right front.

[0017] Figure 4 This is a top view of the grounding body 46 of the first embodiment, viewed from above.

[0018] Figure 5 This is a right-side cross-sectional view of the grounding body 246 in the second embodiment.

[0019] Figure 6 This is a right-side cross-sectional view of the grounding body 346 in the third embodiment.

[0020] Figure 7 This is a right-side cross-sectional view of the grounding body 446 in the fourth embodiment.

[0021] Explanation of reference numerals in the attached figures

[0022] 2. Lawn mower; 10. Cutting blade unit; 12. Operating lever; 12a. Front part; 12b. Rear part; 14. Rear housing; 20. Ring handle; 22. Handle; 24. Unlock lever; 26. Start switch; 28. Transmission shaft; 30. Power wiring; 32. Connector; 40. Gear housing; 40a. Insertion hole; 40b. Opening; 42. Safety cover; 44. Cutting blade; 46. Grounding electrode; 48. First gear; 50. Second gear; 52. Cutting blade shaft; 52a. Threaded part; 52b. Lower end; 54. Transmission part; 54 a. Cylindrical section; 54b. Circular plate section; 56. Upper accessory; 58. Lower accessory; 60. Nut component; 60a. Lower end; 70. Mounting part; 72. Main body section; 74. Circular plate section; 74a. Through hole; 76. Connecting part; 78. First main body section; 78a. Lower end; 79. Second main body section; 79a. Lower end; 80. Inner cylindrical section; 80a. First inner cylindrical section; 80b. Second inner cylindrical section; 82. Flange section; 84. Rib section; 86. Bend section; 86a. First bend section; 86b. Second bend section Part; 88, Outer cylindrical part; 90, Inner rib; 90b, Second inner rib; 92, Outer rib; 92b, Second outer rib; 246, Grounding electrode; 272, Main body; 278, First main body; 278a, Lower end; 279, Second main body; 279a, Lower end; 280, Inner cylindrical part; 282, Flange; 286, Bend; 288, Outer cylindrical part; 290, Recess; 290a, Lower end; 346, Grounding electrode; 372, Main body; 378, First main body; 378a, Lower End; 379, Second main body part; 379a, Lower end; 380, Inner cylindrical part; 382, ​​Flange part; 386, Bent part; 386a, Upper end; 388, Outer cylindrical part; 446, Grounding body; 472, Main body part; 474, Grounding part; 474a, Lower end; 476, Inner main body part; 476a, Lower end; 478, Abutting part; 480, Inner cylindrical part; 482, Flange part; 486, Bent part; 488, Outer cylindrical part; 490, First recess; 490a, Lower end; 492, Second recess. Detailed Implementation

[0023] Referring to the accompanying drawings, representative and non-limiting examples of the invention are described in detail below. This detailed description is merely intended to show those skilled in the art the details of preferred examples for carrying out the invention, and is not intended to limit the scope of the invention. Furthermore, to provide a further improved grounding body, the disclosed additional features and technical solutions can be used separately or together with other features and technical solutions.

[0024] Furthermore, the features and combinations of processes disclosed in the following detailed description are not, in the broadest sense, necessary for carrying out the present invention; they are described only to specifically illustrate representative examples of the invention. Moreover, when providing additional and useful embodiments of the invention, the various features of the following representative examples and the various features of the technical solutions described in the claims do not necessarily need to be combined as in the specific examples described herein or in the order listed.

[0025] All the features intended to be described in this specification and / or claims are disclosed separately and independently, with respect to the structure of the features described in the embodiments and / or claims, as limitations on the specific matters described in the initial disclosure of the application and the claims. Furthermore, all numerical ranges and descriptions relating to combinations or sets are disclosed as limitations on the specific matters described in the initial disclosure of the application and the claims, and their intermediate structures are disclosed.

[0026] In one or more embodiments, the grounding electrode may include: a mounting portion for mounting the grounding electrode to the cutting blade shaft of a lawnmower, wherein a cutting blade is mounted on the cutting blade shaft at a position above the grounding electrode; and a main body portion connected to the mounting portion and in contact with the ground, the main body portion having a first main body portion formed of a first resin and a second main body portion formed of a second resin different from the first resin.

[0027] In one or more embodiments, the grounding electrode may be mounted to the cutting shaft using a nut member. Alternatively, the mounting portion may have a through hole for the cutting shaft to pass through, and the color of the first resin may differ from the color of the second resin. Alternatively, the lower end of the second main body may be located below the lower end of the cutting shaft and the lower end of the nut member, and the lower end of the first main body may be located below the lower end of the second main body.

[0028] When using a lawnmower, the main body in contact with the ground gradually wears down. As the main body wears down, the cutting blade shaft or nut component comes into contact with the ground. In particular, if the outer circumferential surface of the nut component wears down, it cannot be easily disassembled using tools. That is, the grounding electrode and cutting blade cannot be easily replaced. Therefore, it is preferable to replace the grounding electrode before the cutting blade shaft or nut component comes into contact with the ground. According to the above structure, the lower end of the second main body is located below the lower end of the cutting blade shaft and the lower end of the nut component, and the lower end of the first main body is located below the lower end of the second main body. Furthermore, the color of the first resin is different from the color of the second resin. Therefore, the user can easily determine the boundary between the first and second main bodies when the first main body wears down and the second main body is exposed. Thus, the user can replace the grounding electrode the moment the lower end of the second main body is exposed, before the cutting blade shaft or nut component comes into contact with the ground. As a result, wear on the cutting blade shaft and nut component can be suppressed.

[0029] In one or more embodiments, the outer peripheral surface of the first main body may be in contact with the ground, and the second main body may be provided on the inner peripheral surface of the first main body.

[0030] According to the above structure, in the event of wear on the first main body, a second main body portion provided on the inner circumferential surface of the first main body is exposed before the cutting blade shaft or nut component contacts the ground. With this structure, the user can replace the grounding electrode when the exposed second main body portion is visually identifiable, thereby suppressing wear on the cutting blade shaft and nut component.

[0031] In one or more embodiments, a recess may be provided on the inner circumferential surface of the first main body, with the lower end of the recess located below the lower end of the cutting blade shaft and the lower end of the nut member, and a second main body may be provided within the recess.

[0032] According to the above structure, when the first main body wears down, a second main body portion provided in the recess on the inner circumferential surface of the first main body portion is exposed before the cutting blade shaft and nut component come into contact with the ground. With this structure, the user can replace the grounding electrode when the exposed second main body portion is visually identifiable, thereby suppressing wear on the cutting blade shaft and nut component.

[0033] In one or more embodiments, a second main body may be provided on the upper surface of the first main body.

[0034] According to the above structure, when the first main body wears down, the boundary between the first and second main bodies disappears before the cutting blade shaft and nut component contact the ground. With this structure, the user can replace the grounding electrode even when the boundary between the first and second main bodies is no longer visually discernible. Therefore, wear on the outer peripheral surface of the connecting components can be suppressed.

[0035] In one or more embodiments, the main body may further include a third main body portion formed of a third resin different from the first and second resins. Alternatively, the material of the third resin may be different from the materials of the first and second resins. Alternatively, the third resin may be more elastically deformable than the first and second resins. Alternatively, the third main body portion may abut against the lower surface of the cutting edge.

[0036] Typically, the main body formed of resin comes into contact with the lower surface of the cutting blade, which is made of metal. In this case, when the cutting blade rotates, a metallic sound is generated due to the contact between the main body of the grounding element and the cutting blade. By having a component made of a resin that is more easily deformable elastically contact the lower surface of the cutting blade, the generation of metallic sound can be suppressed compared to a structure in which a component made of a resin that is less easily deformable elastically contacts the lower surface of the cutting blade. According to the above structure, a third main body formed of a third resin that is more easily deformable elastically than the first and second resins comes into contact with the lower surface of the cutting blade. Therefore, the metallic sound generated when the lawnmower is in operation can be suppressed. As a result, the quietness of the lawnmower can be improved.

[0037] In one or more embodiments, the first main body may include a cylindrical portion connected to the mounting portion and a flange portion extending radially outward from the lower end of the cylindrical portion. Alternatively, the third main body may be provided on the upper surface of the flange portion.

[0038] According to the above structure, it is possible to prevent the upper surface of the flange portion formed by the first resin from abutting against the lower surface of the cutting blade. That is, it is possible to more reliably prevent the first main body portion formed by the first resin from abutting against the lower surface of the cutting blade. Therefore, it is possible to more reliably suppress the metallic sound generated when the cutting blade rotates.

[0039] In one or more embodiments, the third main body portion may be constructed independently of the first and second main body portions. Alternatively, a recessed portion may be provided on the upper surface of the flange portion, the recessed portion having a downwardly recessed shape. Alternatively, the third main body portion may be located within the recessed portion. Alternatively, the upper end of the third main body portion may be located above the upper end of the flange portion.

[0040] When the third main body is constructed independently of the first and second main bodies, it needs to be placed on the upper surface of the flange to allow the third main body to abut against the lower surface of the cutting blade. In this case, to prevent the third main body from separating from the upper surface of the flange during blade rotation, it needs to be fixed to the upper surface of the flange by bonding, welding, or the like. According to the above structure, the third main body is disposed in a recess provided on the upper surface of the flange. In this case, even without fixing the third main body to the upper surface of the flange by bonding, welding, or the like, it is possible to prevent the third main body from separating from the upper surface of the flange during blade rotation. Therefore, the construction of the main body can be simplified.

[0041] In one or more embodiments, the material of the first resin may be different from that of the second resin. Alternatively, the second resin may be more easily elastically deformed than the first resin. Or, the second main body may abut against the lower surface of the cutting blade.

[0042] According to the above structure, the second main body, formed of a second resin that is more elastically deformable than the first resin, abuts against the lower surface of the cutting blade. Therefore, the metallic noise generated during lawnmower operation can be suppressed. As a result, the quietness of the lawnmower can be improved.

[0043] In one or more embodiments, the first main body may include a cylindrical portion connected to the mounting portion and a flange portion extending radially outward from the lower end of the cylindrical portion. Alternatively, the second main body may be provided on the upper surface of the flange portion.

[0044] According to the above structure, it is possible to prevent the upper surface of the flange portion formed by the first resin from abutting against the lower surface of the cutting blade. That is, it is possible to more reliably prevent the first main body portion formed by the first resin from abutting against the lower surface of the cutting blade. Therefore, it is possible to more reliably suppress the metallic sound generated when the cutting blade rotates.

[0045] In one or more embodiments, the second main body portion may be located on the inner peripheral surface of the flange portion.

[0046] According to the above structure, it is possible to prevent the inner peripheral surface of the flange portion formed by the first resin from abutting against the lower surface of the cutting blade. That is, it is possible to more reliably prevent the first main body portion formed by the first resin from abutting against the lower surface of the cutting blade. Therefore, it is possible to more reliably suppress the metallic sound generated when the cutting blade rotates.

[0047] In one or more embodiments, the second main body portion may be constructed independently of the first main body portion. Alternatively, a recessed portion may be provided on the upper surface of the flange portion, the recessed portion having a downwardly recessed shape. Alternatively, the second main body portion may be provided in the recessed portion. Alternatively, the upper end of the second main body portion may be located above the upper end of the flange portion.

[0048] When the second main body is constructed independently of the first main body, it needs to be placed on the upper surface of the flange to allow the second main body to abut against the lower surface of the cutting blade. In this case, to prevent the second main body from separating from the upper surface of the flange during blade rotation, it needs to be fixed to the upper surface of the flange by bonding, welding, or the like. According to the above structure, the second main body is disposed in a recess provided on the upper surface of the flange. In this case, even without fixing the second main body to the upper surface of the flange by bonding, welding, or the like, it is possible to prevent the second main body from separating from the upper surface of the flange during blade rotation. Therefore, the construction of the main body can be simplified.

[0049] (First Embodiment)

[0050] Reference Figures 1-3 This describes the lawnmower 2 of the first embodiment. (As...) Figure 1 As shown, the lawnmower 2 includes a cutting blade unit 10, an operating lever 12, and a rear housing 14. Hereinafter, it will sometimes be referred to as... Figure 1 The direction perpendicular to the ground P1 is called the up-down direction, and will be... Figure 1 The direction that is perpendicular to the up and down direction is called the front and back direction, and the direction that is perpendicular to both the up and down direction and the front and back direction is called the left and right direction.

[0051] A cutting blade unit 10 is provided at the front part 12a of the operating lever 12, and a rear housing 14 is provided at the rear part 12b of the operating lever 12. The operating lever 12 extends rearward and upward from the cutting blade unit 10. The operating lever 12 connects the cutting blade unit 10 and the rear housing 14.

[0052] The operating lever 12 has a hollow tubular shape and extends in a straight line. A ring-shaped handle 20 for the user to grip is provided on the operating lever 12. A handle 22 is provided between the ring-shaped handle 20 and the rear housing 14 of the operating lever 12. The handle 22 is formed to cover the outer periphery of the operating lever 12. The handle 22 includes an unlocking lever 24 on its upper surface and a start switch 26 on its lower surface. The unlocking lever 24 is a lever for restricting and releasing the push-in operation of the start switch 26. The start switch 26 is a switch for driving a motor (not shown). In the state where the start switch 26 is not pushed in, the power supply to the motor is blocked. In the state where the start switch 26 is pushed in, power is supplied to the motor. In the state where the unlocking lever 24 is not pushed in, the push-in operation of the start switch 26 is restricted. In the state where the unlocking lever 24 is pushed in, the restriction on the push-in operation of the start switch 26 is released. A transmission shaft 28 (see reference) rotates by the drive of the motor. Figure 2 It can be rotatably stored inside the operating lever 12.

[0053] The rear housing 14 houses a motor (not shown) and a control board (not shown). The motor can be a brushless DC motor, a brushed DC motor, an AC motor, or other types of motor. In a variation, a motor can also be housed in the rear housing 14. The control board controls the operation of the motor. One end of a power cable 30 is connected to the rear of the rear housing 14. A connector 32 is provided at the other end of the power cable 30. A power cable extending from an external power source such as a battery (not shown) is connected to the connector 32. The motor operates using power supplied via the power cable 30.

[0054] like Figure 1 , Figure 2 As shown, the cutting unit 10 includes a gear housing 40, a safety cover 42, a cutting blade 44, and a grounding electrode 46. The cutting blade 44 is a double-edged blade composed of a forward-extending blade tip and a rearward-extending blade tip. The cutting blade 44 is made of metal. In variations, the cutting blade 44 can also be a four-edged, eight-edged, or disc-shaped chainsaw. Furthermore, in another variation, the cutting blade 44 can also be made of nylon thread. Figure 2 As shown, an insertion hole 40a for inserting the front part 12a of the operating lever 12 is provided above the rear of the gear housing 40. The gear housing 40 houses a first gear 48, a second gear 50, and a cutting blade shaft 52. A transmission shaft 28 is mounted on the first gear 48. The cutting blade shaft 52 is mounted on the second gear 50. The first gear 48 meshes with the second gear 50. The first gear 48 and the second gear 50 are bevel gears.

[0055] An opening 40b is provided at the lower part of the gear housing 40. The cutting blade unit 10 also includes a transmission part 54, an upper accessory 56, a lower accessory 58, and a nut member 60. The transmission part 54 is provided at the opening 40b. The transmission part 54 includes a cylindrical part 54a and a circular plate part 54b extending radially outward from the cylindrical part 54a. The cylindrical part 54a of the transmission part 54 is detachably mounted to the cutting blade shaft 52. The upper accessory 56 is provided on the lower surface side of the circular plate part 54b of the transmission part 54. The cutting blade 44 is provided on the lower surface side of the upper accessory 56. The lower accessory 58 is provided on the lower surface side of the cutting blade 44. The nut member 60 engages with a threaded portion 52a formed at the lower part of the cutting blade shaft 52. A mounting portion 70 for the grounding body 46 (described later) is provided between the nut member 60 and the lower accessory 58. The lower end 52b of the cutting blade shaft 52 is located below the lower end 60a of the nut member 60. By tightening the nut member 60, the cutting blade 44 is clamped between the upper accessory 56 and the lower accessory 58. In this state, when the cutting blade shaft 52 rotates, the transmission part 54, the upper accessory 56, the lower accessory 58, the nut member 60, the grounding body 46, and the cutting blade 44 rotate as a whole.

[0056] Next, refer to Figures 1-4 The grounding electrode 46 is described below. The grounding electrode 46 includes a mounting portion 70 and a main body portion 72. The mounting portion 70 includes a circular plate portion 74 and a connecting portion 76. The central portion of the circular plate portion 74 protrudes upwards. A through hole 74a is provided in the central portion of the circular plate portion 74. The circular plate portion 74 is located between the lower fitting 58 and the nut member 60. The connecting portion 76 is connected to the main body portion 72.

[0057] Next, the main body 72 will be described. In this embodiment, the grounding electrode 46 is formed by two-color molding. The main body 72 is formed from a first resin having a first color and a second resin having a second color. The first and second colors are not particularly limited; for example, the first color may be "black" and the second color may be "gray." Furthermore, the materials of the first and second resins can be the same or different. Figures 2-4 In order to clearly distinguish the color of the first resin from the color of the second resin, the portion formed by the first resin with the first color is referred to as "white," and the portion formed by the second resin with the second color is referred to as "gray." Hereinafter, after describing the overall shape of the main body 72, the portions formed by the first resin and the portions formed by the second resin in the main body 72 will be described.

[0058] like Figure 3 , Figure 4 As shown, the main body 72 includes an inner cylindrical portion 80, a flange portion 82, and six ribs 84. Figure 2As shown, the inner diameter of the inner cylindrical portion 80 is larger than the outer diameter of the nut member 60. A connecting portion 76 for the mounting portion 70 is connected to the upper part of the inner cylindrical portion 80. The flange portion 82 has a curved portion 86 extending radially outward from the lower end of the inner cylindrical portion 80 and an outer cylindrical portion 88 extending upward from the outer peripheral end of the curved portion 86. The curved portion 86 is curved from below to above as it moves radially outward. The upper surface of the outer cylindrical portion 88 abuts against the lower surface of the cutting edge 44. Figure 3 As shown, rib 84 has an inner rib 90 and an outer rib 92. The inner rib 90 extends radially outward from the outer circumferential surface of the inner cylindrical portion 80. The height of the upper surface of the inner rib 90 is the same as the height of the upper surface of the inner cylindrical portion 80. The outer rib 92 extends radially outward from the radially outer end of the inner rib 90. The outer rib 92 is connected to the inner circumferential surface of the outer cylindrical portion 88. The height of the upper surface of the outer rib 92 is the same as the height of the upper surface of the outer cylindrical portion 88.

[0059] Next, the portions of the main body 72 formed of the first resin and the portions formed of the second resin will be described. Hereinafter, the portions formed of the first resin and the portions formed of the second resin will be referred to as "first main body portion 78" and "second main body portion 79," respectively. Figure 2 As shown, the portion of the main body 72 that is lower than the plane P2, which includes the front-back and left-right directions, is the first main body 78, and the portion of the main body 72 that is higher than the plane P2 is the second main body 79. The plane P2 is a plane located at a distance D below the lower end 52b of the cutting edge axis 52 in the vertical direction.

[0060] like Figure 2As shown, the inner cylindrical portion 80 is composed of a first inner cylindrical portion 80a, which is located below the plane P2, and a second inner cylindrical portion 80b, which is located above the plane P2. Therefore, the first inner cylindrical portion 80a is formed of a first resin, and the second inner cylindrical portion 80b is formed of a second resin. Furthermore, the curved portion 86 of the flange portion 82 is composed of a first curved portion 86a, which is located below the plane P2, and a second curved portion 86b, which is located above the plane P2. Therefore, the first curved portion 86a is formed of a first resin, and the second curved portion 86b is formed of a second resin. Furthermore, the outer cylindrical portion 88 of the flange portion 82 is located above the plane P2. Therefore, the outer cylindrical portion 88 is formed only of a second resin. Furthermore, the inner rib portion 90 is composed of a first inner rib 90a, which is located below the plane P2, and a second inner rib 90b, which is located above the plane P2. Therefore, the first inner rib 90a is formed of a first resin, and the second inner rib 90b is formed of a second resin. Furthermore, the outer rib 92 is composed of a first outer rib 92a, which is the portion lower than plane P2, and a second outer rib 92b, which is the portion higher than plane P2. Therefore, the first outer rib 92a is formed of a first resin, and the second outer rib 92b is formed of a second resin. Thus, the first main body 78 is composed of a first inner cylindrical portion 80a, a first curved portion 86a, a first inner rib 90a, and a first outer rib 92a. Furthermore, the second main body 79 is composed of a second inner cylindrical portion 80b, a second curved portion 86b, an outer cylindrical portion 88, a second inner rib 90b, and a second outer rib 92b. Thus, in this embodiment, the second main body 79 is provided on the upper surface of the first main body 78. Furthermore, the lower end 79a of the second main body 79 is located below the lower end 52b of the cutting blade shaft 52 and the lower end 60a of the nut member 60. Also, the lower end 78a of the first main body 78 is located below the lower end 79a of the second main body 79.

[0061] In one or more embodiments, such as Figure 1 , Figure 2 As shown, the grounding body 46 includes a mounting portion 70 for mounting the grounding body 46 to the cutting blade shaft 52 and a main body portion 72 connected to the mounting portion 70 and in contact with the ground P1. In the cutting blade shaft 52, a cutting blade 44 is mounted at a position above the grounding body 46. The main body portion 72 has a first main body portion 78 formed of a first resin and a second main body portion 79 formed of a second resin different from the first resin. By using two types of resin to form the main body portion 72, compared to the case where the main body portion 72 is formed of only one type of resin, the user's visual visibility can be improved, or the quietness of the lawnmower 2 can be improved.

[0062] Furthermore, in one or more embodiments, such as Figure 2As shown, the grounding electrode 46 is mounted to the cutting blade shaft 52 using a nut member 60. The mounting portion 70 has a through hole 74a for the cutting blade shaft 52 to pass through. The color of the first resin is different from the color of the second resin. The lower end 79a of the second main body portion 79 is located below the lower end 52b of the cutting blade shaft 52 and the lower end 60a of the nut member 60, and the lower end 78a of the first main body portion 78 is located below the lower end 79a of the second main body portion 79. When using the lawnmower 2, the main body portion 72 of the grounding electrode 46, which is in contact with the ground P1, gradually wears down. Due to the gradual wear of the main body portion 72, the cutting blade shaft 52 or the nut member 60 comes into contact with the ground P1. In particular, if the outer peripheral surface of the nut member 60 is worn, the nut member 60 cannot be easily disassembled using tools. That is, the grounding electrode 46 and the cutting blade 44 cannot be easily replaced. Therefore, it is preferable to replace the grounding electrode 46 before the cutting blade shaft 52 or the nut member 60 comes into contact with the ground P1. According to the above structure, the lower end 79a of the second main body 79 is located below the lower end 52b of the cutting blade shaft 52 and the lower end 60a of the nut member 60, and the lower end 78a of the first main body 78 is located below the lower end 79a of the second main body 79. Furthermore, the color of the first resin is different from the color of the second resin. Therefore, the user can easily determine the boundary between the first main body 78 and the second main body 79 when the first main body 78 is worn and the second main body 79 is exposed. Consequently, the user can replace the grounding electrode 46 at the moment the lower end 79a of the second main body 79 is exposed, before the cutting blade shaft 52 or the nut member 60 contacts the ground P1. As a result, wear on the outer peripheral surface of the nut member 60 can be suppressed.

[0063] Furthermore, in one or more embodiments, such as Figure 2 As shown, a second main body portion 79 is provided on the upper surface of the first main body portion 78. According to the above structure, as the first main body portion 78 gradually wears down to its upper surface, the boundary between the first main body portion 78 and the second main body portion 79 disappears. With this structure, the user can replace the grounding electrode 46 without visually recognizing the boundary between the first main body portion 78 and the second main body portion 79. Therefore, wear on the outer peripheral surface of the nut member 60 can be suppressed.

[0064] Furthermore, in one or more embodiments, such as Figures 1-4As shown, the lawnmower 2 includes an operating lever 12, a cutting shaft 52 located at the front part 12a of the operating lever 12, a cutting blade 44 mounted on the cutting shaft 52, and a grounding body 46 mounted on the cutting shaft 52 at a position lower than the cutting blade 44 and in contact with the ground P1. The grounding body 46 includes a mounting portion 70 for mounting the grounding body 46 to the cutting shaft 52 and a main body portion 72 connected to the mounting portion 70 and in contact with the ground P1. The main body portion 72 has a first main body portion 78 formed of a first resin and a second main body portion 79 formed of a second resin different from the first resin. By using two types of resin to form the main body portion 72 of the grounding body 46, the user's visual visibility can be improved, or the quietness of the lawnmower 2 can be improved compared to the case where the main body portion 72 is made of a single resin.

[0065] (Second Embodiment)

[0066] Next, refer to Figure 5 The grounding electrode 246 of the second embodiment is described below. Furthermore, common structural elements across the embodiments are labeled with the same reference numerals and their descriptions are omitted.

[0067] like Figure 5 As shown, the grounding body 246 includes a mounting portion 70 and a main body portion 272. Similar to the main body portion 72 of the first embodiment, the main body portion 272 of this embodiment is formed by two-color molding. That is, the main body portion 272 is formed from a first resin having a first color and a second resin having a second color. The main body portion 272 includes a first main body portion 278 formed of the first resin and a second main body portion 279 formed of the second resin.

[0068] The first main body 278 includes an inner cylindrical portion 280 and a flange portion 282. The shape of the inner cylindrical portion 280 is similar to that of the inner cylindrical portion 80 in the first embodiment (see reference). Figure 2 The flange portion 282 has the same shape as the inner cylindrical portion 280. The flange portion 282 has a curved portion 286 extending radially outward from the lower end of the inner cylindrical portion 280 and an outer cylindrical portion 288 extending upward from the outer peripheral end of the curved portion 286. The shape of the outer cylindrical portion 288 is the same as that of the outer cylindrical portion 88 in the first embodiment (see reference 88). Figure 2 The shape of the curved portion 286 is the same as that of the curved portion 86 in the first embodiment (see reference). Figure 2 The shape is the same as that of the other two parts. A recessed portion 290 is provided on the upper part of the curved portion 286. The lower end 290a of the recess 290 is located below the lower end 52b of the cutting blade shaft 52 and the lower end 60a of the nut member 60.

[0069] The second main body portion 279 is provided on the inner peripheral surface of the first main body portion 278 (specifically, the outer peripheral surface of the inner cylindrical portion 280, the upper surface of the curved portion 286, and the inner peripheral surface of the outer cylindrical portion 288). Furthermore, the second main body portion 279 is also provided within the recess 290 provided in the upper part of the curved portion 286. The lower end 279a of the second main body portion 279 is located below the lower end 52b of the cutting blade shaft 52 and the lower end 60a of the nut member 60. Furthermore, the lower end 278a of the first main body portion 278 is located below the lower end 279a of the second main body portion 279.

[0070] In one or more embodiments, such as Figure 5 As shown, the outer peripheral surface of the flange portion 282 of the first main body portion 278 contacts the ground P1, and the inner peripheral surface of the flange portion 282 of the first main body portion 278 (i.e., the upper surface of the curved portion 286 and the inner peripheral surface of the outer cylindrical portion 288) is provided with a second main body portion 279. According to the above structure, in the event of wear of the first main body portion 278, the second main body portion 279 provided on the inner peripheral surface of the first main body portion 278 is exposed before the cutting blade shaft 52 or the nut member 60 contacts the ground P1. With this structure, the user can replace the grounding electrode 246 when the exposed second main body portion 279 is visually identifiable, thereby suppressing wear on the outer peripheral surface of the nut member 60.

[0071] Furthermore, in one or more embodiments, such as Figure 5 As shown, a recess 290 is provided on the inner peripheral surface of the flange portion 282 of the first main body portion 278 (specifically, the upper surface of the curved portion 286). The lower end 290a of the recess 290 is located below the lower end 52b of the cutting blade shaft 52 and the lower end 60a of the nut member 60. A second main body portion 279 is provided within the recess 290. According to the above structure, as the first main body portion 278 gradually wears down, the second main body portion 279 provided in the recess 290 is exposed. With this structure, the user can replace the grounding electrode 246 when the exposed second main body portion 279 is visually identifiable, thereby suppressing wear on the outer peripheral surface of the nut member 60.

[0072] (Third Embodiment)

[0073] Next, refer to Figure 6The grounding electrode 346 of the third embodiment is described below. The grounding electrode 346 includes a mounting portion 70 and a main body portion 372. In this embodiment, the main body portion 372 is also formed by two-color molding. In this embodiment, the main body portion 372 is composed of a first main body portion 378 and a second main body portion 379, wherein the first main body portion 378 is formed of a first resin and the second main body portion 379 is formed of a second resin. The second resin is more easily elastically deformed than the first resin. For example, the Young's modulus of the second resin (i.e., the second main body portion 379) is smaller than that of the first resin (i.e., the first main body portion 378). The first resin is, for example, a resin formed of PA6, and the second resin is, for example, a resin formed of thermoplastic polyurethane (TPU, polyurethane resin).

[0074] The first main body portion 378 includes an inner cylindrical portion 380 and a flange portion 382. The shape of the inner cylindrical portion 380 is similar to that of the inner cylindrical portion 80 in the first embodiment (see reference). Figure 2 The flange portion 382 has the same shape as the inner cylindrical portion 380. A curved portion 386 extends radially outward from the lower end of the inner cylindrical portion 380, and an outer cylindrical portion 388 extends upward from the outer peripheral end of the curved portion 386. The outer cylindrical portion 388 extends upward from the outer peripheral end of the curved portion 386. The upper surface of the outer cylindrical portion 388 does not abut against the lower surface of the cutting edge 44. The shape of the curved portion 386 is the same as that of the curved portion 86 in the first embodiment (see reference 86). Figure 2 The upper end 386a of the curved part 386 is located below the lower end 52b of the cutting shaft 52 and the lower end 60a of the nut component 60.

[0075] The second main body portion 379 is provided on the outer peripheral surface of the inner cylindrical portion 380, the upper surface of the curved portion 386, the inner peripheral surface of the outer cylindrical portion 388, and the upper surface of the outer cylindrical portion 388. The upper surface of the second main body portion 379 abuts against the lower surface of the cutting blade 44. Furthermore, the lower end 379a of the second main body portion 379 is located below the lower end 52b of the cutting blade shaft 52 and the lower end 60a of the nut member 60. Also, the lower end 378a of the first main body portion 378 is located below the lower end 379a of the second main body portion 379.

[0076] In one or more embodiments, the material of the first resin is different from that of the second resin, and the second resin is more easily elastically deformed compared to the first resin. For example... Figure 6As shown, the second main body portion 379 abuts against the lower surface of the cutting blade 44. By having a component made of a resin that is relatively easy to elastically deform contact the lower surface of the cutting blade 44, the generation of metallic noise can be suppressed compared to a structure in which a component made of a resin that is relatively difficult to elastically deform contact the lower surface of the cutting blade 44. According to the above structure, the second main body portion 379, made of a second resin that is relatively easy to elastically deform, abuts against the lower surface of the cutting blade 44. Therefore, metallic noise generated when the lawnmower 2 is operating can be suppressed. As a result, the quietness of the lawnmower 2 can be improved. In addition, from the viewpoint of suppressing metallic noise, the second main body portion 379 only needs to abut against the lower surface of the cutting blade 44, and may not have a lower end 379a and a portion along the outer cylindrical portion 388.

[0077] Furthermore, in one or more embodiments, such as Figure 6 As shown, the first main body portion 378 includes an inner cylindrical portion 380 connected to the mounting portion 70 and a flange portion 382 extending radially outward from the lower end of the inner cylindrical portion 380. A second main body portion 379 is provided on the upper surface of the flange portion 382. According to the above structure, it is possible to prevent the upper surface of the flange portion 382, ​​formed of the first resin, from abutting against the lower surface of the cutting blade 44. That is, it is possible to more reliably prevent the first main body portion 378, formed of the first resin, from abutting against the lower surface of the cutting blade 44. Therefore, it is possible to more reliably suppress the metallic sound generated when the cutting blade 44 rotates.

[0078] Furthermore, in one or more embodiments, such as Figure 6 As shown, the second main body portion 379 is provided on the inner peripheral surface of the flange portion 382. According to the above structure, it is possible to prevent the inner peripheral surface of the flange portion 382, ​​formed of the first resin, from abutting against the lower surface of the cutting blade 44. That is, it is possible to more reliably prevent the first main body portion 378, formed of the first resin, from abutting against the lower surface of the cutting blade 44. Therefore, it is possible to more reliably suppress the metallic sound generated when the cutting blade 44 rotates.

[0079] (Correspondence)

[0080] The inner cylindrical portion 380 is an example of a "cylindrical portion".

[0081] (Example 4)

[0082] Next, refer to Figure 7The grounding body 446 of the fourth embodiment is described below. The grounding body 446 includes a mounting portion 70 and a main body portion 472. The main body portion 472 includes a grounding portion 474 that contacts the ground P1, an inner main body portion 476, and an abutment portion 478. The grounding portion 474 and the inner main body portion 476 are integrally formed. The grounding portion 474 and the inner main body portion 476 are formed by two-color molding. The abutment portion 478 is formed independently of the grounding portion 474 and the inner main body portion 476. The abutment portion 478 is, for example, a rubber O-ring, formed of a resin that is more easily elastically deformable than the grounding portion 474 and the inner main body portion 476. For example, the Young's modulus of the abutment portion 478 is smaller than that of the grounding portion 474 and the inner main body portion 476.

[0083] The grounding portion 474 includes an inner cylindrical portion 480 and a flange portion 482. The shape of the inner cylindrical portion 480 is the same as that of the inner cylindrical portion 280 in the second embodiment (see reference). Figure 5 The flange portion 482 has the same shape as the inner cylindrical portion 480. The flange portion 482 has a curved portion 486 extending radially outward from the lower end of the inner cylindrical portion 480 and an outer cylindrical portion 488 extending upward from the outer peripheral end of the curved portion 486. The shape of the curved portion 486 is the same as that of the curved portion 286 in the second embodiment (see reference 286). Figure 5 The two parts have the same shape. A first recess 490 is provided at the upper part of the curved part 486, which is recessed downwards. The lower end 490a of the first recess 490 is located below the lower end 52b of the cutting blade shaft 52 and the lower end 60a of the nut member 60. A second recess 492 is provided at the upper surface of the outer cylindrical part 488, which is recessed downwards. An abutment part 478 is provided in the second recess 492. The upper end of the abutment part 478 is located above the upper end of the outer cylindrical part 488. When the grounding body 446 is installed on the cutting blade shaft 52, a gap S1 is provided between the upper end of the outer cylindrical part 488 and the lower surface of the cutting blade 44. The upper end of the abutment part 478 contacts the lower surface of the cutting blade 44.

[0084] The shape of the inner main body portion 476 is the same as that of the second main body portion 279 in the second embodiment (see reference). Figure 5 The inner main body portion 476 is located on the inner circumferential surface of the grounding portion 474 (specifically, on the outer circumferential surface of the inner cylindrical portion 480, the upper surface of the curved portion 486, and the inner circumferential surface of the outer cylindrical portion 488). Furthermore, the inner main body portion 476 is also located within the first recess 490. The lower end 476a of the inner main body portion 476 is located below the lower end 52b of the cutting blade shaft 52 and the lower end 60a of the nut member 60. Additionally, the lower end 474a of the grounding portion 474 is located below the lower end 476a of the inner main body portion 476.

[0085] In one or more embodiments, the main body 472 includes a grounding portion 474 (an example of a "first main body"), an inner main body portion 476 (an example of a "second main body"), and an abutment portion 478 (an example of a "third main body"). The abutment portion 478 is made of a different material than the grounding portion 474 and the inner main body portion 476. The abutment portion 478 is more elastically deformable than the grounding portion 474 and the inner main body portion 476. The abutment portion 478 abuts against the lower surface of the cutting blade 44. According to the above structure, the abutment portion 478, formed of a third resin that is more elastically deformable than the grounding portion 474 and the inner main body portion 476, abuts against the lower surface of the cutting blade 44. Therefore, the metallic noise generated when the lawnmower 2 is operating can be suppressed. As a result, the quietness of the lawnmower 2 can be improved.

[0086] In one or more embodiments, the grounding portion 474 includes an inner cylindrical portion 480 (an example of a "cylindrical portion") and a flange portion 482. An abutment portion 478 is provided on the upper surface of the flange portion 482. According to the above structure, it is possible to prevent the upper surface of the flange portion 482, formed of the first resin, from abutting against the lower surface of the cutting blade 44. That is, it is possible to more reliably prevent the grounding portion 474, formed of the first resin, from abutting against the lower surface of the cutting blade 44. Therefore, it is possible to more reliably suppress the metallic sound generated when the cutting blade 44 rotates.

[0087] In one or more embodiments, the grounding portion 474 is constructed independently of the inner main body portion 476. A second recess 492 (an example of a "recess") is provided on the upper surface of the flange portion 482, and the second recess 492 has a downwardly recessed shape. The grounding portion 474 is provided in the second recess 492. The upper end of the grounding portion 474 is located above the upper end of the flange portion 482. According to the above structure, the grounding portion 474 is disposed in the second recess 492 provided on the upper surface of the flange portion 482. In this case, even without fixing the grounding portion 474 to the upper surface of the flange portion 482 by means of bonding, welding, etc., it is possible to prevent the grounding portion 474 from separating from the upper surface of the flange portion 482 during the rotation of the cutting blade 44. Therefore, the construction of the main body portion 472 can be simplified.

[0088] The specific examples of the present invention have been described in detail above, but these are merely illustrative and do not limit the scope of the claims. The technology described in the claims includes technologies obtained by various modifications and alterations to the specific examples described above.

[0089] (First variation) In Figure 5In the second embodiment shown, the recess 290 may not be provided on the upper part of the curved portion 286 of the first main body portion 278. In this modified example, the upper surface of the curved portion 286 may be located below the lower end 52b of the cutting blade shaft 52 and the lower end 60a of the nut member 60. As a result, the lower end 279a of the second main body portion 279, which is provided on the inner circumferential surface of the flange portion 282 (i.e., the outer circumferential surface of the inner cylindrical portion 280, the upper surface of the curved portion 286, and the inner circumferential surface of the outer cylindrical portion 288), is located below the lower end 52b of the cutting blade shaft 52 and the lower end 60a of the nut member 60.

[0090] (Second variation) In Figure 6 In the third embodiment shown, it is also possible that the flange portion is not provided on the first main body portion 378, but on the second main body portion 379. In this modified example, the upper surface of the flange portion formed of the second resin abuts against the lower surface of the cutting blade 44.

[0091] (Third variation) In Figure 6 In the third embodiment shown, the second main body portion 379 may also be provided only on the upper surface of the flange portion 382 (more specifically, on the upper surface of the outer cylindrical portion 388). That is, the second main body portion 379 may also not be provided on the inner circumferential surface of the flange portion 382 (more specifically, on the inner circumferential surface of the curved portion 386).

[0092] (4th variation) Figures 1-4 The first main body portion 78 and the second main body portion 79 of the first embodiment shown can also be formed separately. Furthermore, Figure 5 The first main body portion 278 and the second main body portion 279 of the second embodiment shown can also be formed separately. Furthermore, Figure 6 The first main body portion 378 and the second main body portion 379 of the third embodiment shown can also be formed separately.

[0093] (5th variation) In Figure 7 In the fourth embodiment shown, the main body 472 may include a grounding portion 474 and an abutment portion 478, but not the inner main body 476. In this modified example, the grounding portion 474 and the abutment portion 478 are examples of "first main body" and "second main body," respectively. With this structure, the metallic noise generated when the lawnmower 2 is in operation can be suppressed, and the quietness of the lawnmower 2 can be improved.

[0094] The technical elements illustrated in this specification or drawings exert their technical usefulness individually or in various combinations, and are not limited to the combinations recited in the claims at the time of application. Furthermore, the technology illustrated in this specification or drawings can achieve multiple objectives simultaneously, and achieving one of these objectives is itself technically useful.

Claims

1. A grounding electrode, installed on the cutting blade shaft of a lawnmower, wherein, The grounding electrode includes: A mounting part is used to mount the grounding body to the cutting blade shaft. A cutting blade is mounted on the cutting blade shaft at a position above the grounding body. The cutting blade is clamped vertically between an upper fitting that abuts against the upper surface of the cutting blade and a lower fitting that abuts against the lower surface of the cutting blade. The mounting part abuts against the lower surface of the lower fitting and is mounted to the cutting blade shaft by means of the lower fitting. The main body, which is connected to the mounting part, is in contact with the ground. The main body portion has a first main body portion formed of a first resin and a second main body portion formed of a second resin different from the first resin. The first resin is made of a different material than the second resin. The second resin is more prone to elastic deformation compared to the first resin. The second main body abuts against the lower surface of the cutting blade at a position farther from the cutting blade axis than the mounting part, the upper accessory, and the lower accessory.

2. The grounding electrode according to claim 1, wherein, The grounding electrode is installed on the cutting shaft using a nut component. The mounting part has a through hole for the cutting blade shaft to pass through. The color of the first resin is different from the color of the second resin. The lower end of the second main body is located below the lower end of the cutting blade shaft and the lower end of the nut component. The lower end of the first main body is located below the lower end of the second main body.

3. The grounding electrode according to claim 2, wherein, The outer peripheral surface of the first main body is in contact with the ground. The second main body is provided on the inner circumferential surface of the first main body.

4. The grounding electrode according to claim 2 or 3, wherein, The second main body is provided on the upper surface of the first main body.

5. The grounding electrode according to claim 1, wherein, The main body portion also has a third main body portion formed of a third resin different from the second resin. The material of the second resin is different from the material of the first resin and the material of the third resin. The second resin is more elastically deformable than the first resin and the third resin. The grounding electrode is installed on the cutting shaft using a nut component. The mounting part has a through hole for the cutting blade shaft to pass through. The color of the first resin is different from the color of the third resin. The lower end of the third main body is located below the lower end of the cutting blade shaft and the lower end of the nut component. The lower end of the first main body is located below the lower end of the third main body.

6. The grounding electrode according to claim 1, wherein, The first main body includes a cylindrical portion connected to the mounting portion and a flange portion extending radially outward from the lower end of the cylindrical portion. The second main body portion is disposed on the upper surface of the flange portion.

7. The grounding electrode according to claim 6, wherein, The second main body portion is located on the inner circumferential surface of the flange portion.

8. The grounding electrode according to claim 7, wherein, The second main body portion is constructed independently of the first main body portion. A recessed portion is provided on the upper surface of the flange portion, the recessed portion having a downwardly recessed shape. The second main body portion is disposed in the recessed portion. The upper end of the second main body is located above the upper end of the flange.

9. A lawnmower, wherein, The lawnmower includes: control lever; A cutting blade shaft is located at the front of the operating lever; A cutting blade, which is mounted on the cutting blade shaft; The upper accessory abuts against the upper surface of the cutting blade; The lower fitting abuts against the lower surface of the cutting blade, the cutting blade being held between the upper fitting and the lower fitting in the vertical direction; and A grounding electrode is installed on the cutting blade shaft at a position lower than the cutting blade, and is in contact with the ground. The grounding electrode includes: Mounting part, which is used to mount the grounding body to the cutting blade shaft, abut against the lower surface of the lower accessory and mounted to the cutting blade shaft by means of the lower accessory; and The main body, which is connected to the mounting part, is in contact with the ground. The main body portion has a first main body portion formed of a first resin and a second main body portion formed of a second resin different from the first resin. The first resin is made of a different material than the second resin. The second resin is more prone to elastic deformation compared to the first resin. The second main body abuts against the lower surface of the cutting blade at a position farther from the cutting blade axis than the mounting part, the upper accessory, and the lower accessory.

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