WO2018028624A1

WO2018028624A1 - Lawnmower and blade thereof

Info

Publication number: WO2018028624A1
Application number: PCT/CN2017/096768
Authority: WO
Inventors: 杜江
Original assignee: 苏州宝时得电动工具有限公司
Priority date: 2016-08-11
Filing date: 2017-08-10
Publication date: 2018-02-15
Also published as: CN206061521U; CN109661167A

Abstract

A blade (100) for use in a lawnmower, the blade (100) comprising a blade portion (120) for cutting and a blade body (110) connecting the blade portion (120). The blade portion (120) is located on an outer edge of the blade body (110), and the blade body (110) and the blade portion (120) are made using different materials.

Description

Lawn mower and its blade

Technical field

The invention relates to a lawn mower and a blade thereof, in particular a rotary cutting lawn mower and a blade thereof.

Background technique

In the current lawn mower, when the lawn mower is in use, the blade rotates at a high speed, and the strength of the blade used by the lawn mower usually needs to meet the provisions of 21.101.1 of the European intelligent lawn mower standard EN50636-2-107_2015 standard. . In the prior art, in order to meet the blade strength requirement, the blade hardness cannot be too high. If the blade hardness is too high, when the lawn mower performs the mowing task, the high-speed rotating blade will easily crack when hitting the obstacle, and the foreign object will be ejected. Injury to someone or other object next to it. However, the hardness of the blade cannot be made too low. If the hardness of the blade is too low, the wear resistance of the blade is not good, and the blade is easily worn. After the blade is damaged, the user needs to replace the new blade. Due to the short use time of the blade, the user needs to replace the blade frequently, which increases the cost of the accessory and affects the user's use.

Summary of the invention

In order to overcome the deficiencies of the prior art, the problem to be solved by the present invention is to provide a blade capable of extending the service life, avoiding frequent replacement, and reducing the cost of the accessory, and also providing a lawn mower including the above blade.

In order to solve the above problems, the present invention adopts the following technical solutions:

A blade for use in a lawn mower, characterized in that the blade includes a blade portion for cutting and a blade body connecting the blade portion, the blade portion being located at an outer edge of the blade body, the blade The body and the blade portion are made of different materials.

Preferably, the lawn mower is a rotary cutting lawn mower.

Preferably, the lawn mower is a smart lawn mower provided with a casing, a walking system, a cutting system, a detection system and a control system.

Preferably, the material of the blade body and the blade portion are both metal materials.

Preferably, the material of the blade portion has a hardness ranging from HRC 56 to 75.

Preferably, the material of the blade portion has a hardness ranging from HRC 65 to 70.

Preferably, the material of the blade portion has a hardness of HRC65.

Preferably, the material of the blade body has a hardness ranging from 30 to 60 HRC.

Preferably, the material of the blade body has a hardness ranging from 40 to 50 HRC.

Preferably, the material of the blade body has a hardness of HRC50.

Preferably, the wear resistance of the material of the blade portion is greater than the wear resistance of the material of the blade body.

Preferably, the hardness of the material of the blade portion is greater than the hardness of the material of the blade body.

Preferably, the toughness of the material of the blade body is greater than the toughness of the material of the blade portion.

Preferably, the blade body is made of carbon steel.

Preferably, the blade portion is made of high speed steel or alloy tool steel.

Preferably, the blade portion is fixedly coupled to the blade body.

Preferably, the blade portion is welded and fixed to the blade body.

Preferably, the blade portion is fixed to the blade body by riveting.

Preferably, the number of the blade portions is two.

Preferably, the two blade portions are respectively disposed at opposite ends of the blade body.

Preferably, the blade body is a rectangle having two long sides, and the blade portions are respectively disposed on the two long sides.

Preferably, the cutting edge portion has a cross-sectional area of 0.1 to 0.6 times the sectional area of the blade body.

Preferably, the blade portion is a double-sided blade or a single-sided blade.

Preferably, the blade body is provided with a mounting hole, and the blade is fixed to the lawn mower through the mounting hole.

The present invention can also adopt the following technical solution: a lawn mower comprising a cutter head and a blade fixed to the cutter head, wherein the blade includes a blade portion for cutting and connecting the blade portion The blade body is located at an outer edge of the blade body, and the blade body and the blade portion are made of different materials.

Preferably, the lawn mower is a rotary cutting lawn mower.

Preferably, the lawn mower is a smart lawn mower, the smart lawn mower comprising a casing, a walking system, a cutting system, a detecting system and a control system, the cutting system comprising the cutter head and being fixed to the The blade on the cutter head.

Preferably, the material of the blade portion has a hardness of HRC65.

Preferably, the material of the blade body has a hardness ranging from HRC50.

Preferably, the blade body is made of carbon steel.

Preferably, the blade portion is made of high speed steel or alloy tool steel.

Preferably, the blade portion is fixedly coupled to the blade body.

Preferably, the blade portion is welded and fixed to the blade body.

Preferably, the blade portion is fixed to the blade body by riveting.

Preferably, the number of the blade portions is two.

Preferably, the blade portion is a double-sided blade or a single-sided blade.

Preferably, the blade body is provided with a mounting hole, and the lawn mower is further provided with a fixing member, and the fixing member fixes the blade to the cutter head through the mounting hole.

Preferably, the lawn mower has at least two of the blades, and the blades are disposed on the cutter head.

The invention can also adopt the following technical solutions:

A blade, wherein the blade is mounted on a cutter head of a lawn mower, the blade comprising:

Blade body; and

a blade portion, the blade portion is fixedly disposed at an edge position of the blade body;

The blade body is different from the material of the blade portion.

Preferably, the wear resistance of the material of the blade portion is greater than the wear resistance of the blade body; the toughness of the material of the blade body is greater than the toughness of the material of the blade portion.

Preferably, the blade body is made of carbon steel; the blade portion is made of high speed steel or alloy tool steel.

Preferably, the blade portion is welded to the blade body.

Preferably, the number of the blade portions is two, and the two blade portions are respectively disposed at edge positions of the blade body.

Preferably, the blade body has a rectangular shape, and the two blade portions are respectively disposed on two long sides of the blade body.

Preferably, the blade portion is a double-sided blade or a single-sided blade.

Preferably, the blade body is provided with a mounting hole through which the fixing member passes to fix the blade body to the cutter head.

The invention has the beneficial effects that the blade is made of two different materials to meet different functional requirements, thereby effectively extending the service life of the blade, avoiding frequent replacement and reducing the cost of the accessory.

DRAWINGS

Figure 1 is a front elevational view of a blade according to a first embodiment of the present invention;

Figure 2 is a left side view of the blade shown in Figure 1;

Figure 3 is a front elevational view of the blade of the second embodiment of the present invention;

Figure 4 is a front elevational view of a blade in accordance with a third embodiment of the present invention.

detailed description

In order to make the objects, technical solutions and advantages of the present invention more comprehensible, the lawn mower and its blade of the present invention will be further described in detail below with reference to the accompanying drawings. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to FIG. 1 and FIG. 2, the present invention provides a blade 100 mounted on a cutter head of a lawn mower. In the present invention, the lawn mower is a rotary cutting lawn mower, and the rotary cutting lawn mower is Refers to a lawn mower that performs high-speed rotation of the blade to perform a mowing task while the mower is working. When the lawn mower performs the mowing operation, the cutter head rotates and drives the blade 100 to rotate, so that the blade 100 cuts the vegetation and realizes the mowing function of the lawn mower. The blade 100 of the present invention can ensure the cutting performance, so that the use time of the blade 100 is long, the number of times the user frequently replaces the blade 100 is reduced, and the accessory cost is reduced.

In the present invention, the blade 100 includes a blade portion 120 for cutting and a blade body 110 connecting the blade portion 120. The blade portion 120 is located at an outer edge of the blade body 110, and the blade body 110 and the blade portion 120 are employed. Made of different materials. The blade portion 120 and the blade body 110 can be integrally formed at the time of molding to form two connected regions; the blade portion 120 and the blade body 110 can also be separately formed to form two components, and then the two components are fixedly connected. Together. In this embodiment, the blade portion 120 and the blade body 110 are separately formed to form two components, and then the two components are fixedly coupled together.

The blade portion 120 is fixedly disposed at an edge position of the blade body 110. The blade portion 120 is the main portion for cutting, and the blade body 110 is for fixing to the mower cutter head. Therefore, the mowing function of the lawn mower can be realized as long as the cutting performance of the blade portion 120 is ensured.

The blade body 110 is different in material from the blade portion 120. That is, the blade body 110 and the blade portion 120 are made of different materials. Thus, the blade portion 120 can be made of a material having a good cutting property, and the blade body 110 can be reliably fixed to the cutter head of the lawn mower. This can greatly reduce the production cost of the blade 100, and the blade portion 120 can also ensure the mowing ability of the lawn mower, so that the blade 100 can be used for a long time, reducing the number of times the blade 100 is replaced, and reducing the cost of the accessory. In the preferred embodiment, the blade body 110 can be made of a material having a high impact strength due to the high speed rotation of the blade during operation of the lawn mower to prevent breakage of the blade during high speed rotation.

In a specific embodiment, the blade portion 120 can be made of a material having a higher hardness, which not only achieves the wear resistance requirement of the blade portion but also meets the overall strength requirement of the blade 100. The blade body 110 can be made of a material having a higher strength to meet the strength requirement of the blade 100. Specifically, the blade body 110 can be used in such a manner that the strength meets the requirements. Preferably, the blade body 110 is made of a material having good toughness. In other embodiments, the blade body 110 can also be made of a material having a high hardness or made of other materials having a higher strength.

In a specific embodiment, the blade portion 120 may be made of a material having a hardness ranging from HRC 56 to 75, preferably HRC 65 to 70, to meet the wear resistance of the blade portion 120. Generally, in a certain range, the hardness is greater. The wear resistance of the blade portion 120 is stronger. In the preferred embodiment, the hardness of the material of the blade portion 120 can be selected from HRC 65 to meet the wear resistance requirements of the blade portion 120 while avoiding material being too expensive and wasting resources.

In a specific example, the blade body 110 may select a material having a hardness ranging from HRC 30 to 60, preferably HRC 40 to 50, to meet the impact strength requirement of the blade body 110. Generally, the hardness is lower within a certain range. The greater the toughness of the blade body 110, the less likely the brittle fracture occurs and the stronger the impact strength. In the preferred embodiment, the hardness of the material of the blade body 110 is HRC50, which can meet the impact strength requirements of the blade body 110, and the material selection is relatively simple, avoiding difficulty in selecting materials, expensive materials, and waste of resources.

In another embodiment, the wear resistance of the material of the blade portion 120 is greater than the wear resistance of the material of the blade body 110, and the toughness of the material of the blade body 110 is greater than the toughness of the material of the blade portion 120. The cutting performance of the blade portion 120 is manifested by the wear resistance of the blade portion 120, and the wear resistance of the material of the blade portion 120 is greater than the wear resistance of the blade body 110, which can reduce material waste and reduce the production cost of the blade 100. The blade portion 120 and the blade body 110 are according to respective functions The requirements are made of materials with different characteristics for different purposes. In a specific embodiment, the hardness of the material of the blade portion 120 is greater than the hardness of the material of the blade body 110 to achieve a wear resistance of the material of the blade portion 120 that is greater than the wear resistance of the material of the blade body 110.

In a specific embodiment, the material of the blade body 110 and the blade portion 120 are both metal materials. Specifically, the blade body 110 is made of carbon steel or equivalent steel; the blade portion 120 is made of high speed steel, alloy tool steel or the like. Made of performance steel. In the present embodiment, the blade body 110 is made of carbon steel, and the blade portion 120 is made of high alloy tool steel in alloy tool steel. This can greatly reduce the production cost of the blade 100 while also ensuring the wear resistance of the blade 100, so that the blade 100 can be used for a long time. In other embodiments, the blade portion 120 and the blade body 110 may also be made of a non-metallic material. In other embodiments, the material of the blade portion 120 and the blade body 110 may be arbitrarily selected from one or two materials in a metal material, a non-metal material, and a combination of a metal material and a non-metal material according to actual conditions.

The blade portion 120 and the blade body 110 of the present invention may be an integrally formed blade which is integrally formed and has different materials; or two structures respectively formed separately, and then the two structures are fixedly connected together to form an integral blade. 100. In a specific embodiment, the blade portion 120 is welded to the blade body 110. That is, the blade portion 120 is fixed to the blade body 110 by welding, so that the blade portion 120 can be securely fixed to the blade body 110. In the present embodiment, the blade portion 120 is fixed to the blade body 110 by laser welding. In other embodiments, the blade portion 120 and the blade body 110 may also be fixedly connected to each other by means of riveting or glue water.

In the present invention, the blade portions 120 may be several (including one). In one embodiment, as shown in FIG. 1, the number of the blade portions 120 is two, and the two blade portions 120 are respectively disposed at the edge positions of the opposite ends of the blade body 110. Preferably, the blade body 110 has a rectangular shape, and the two blade portions 120 are respectively disposed on the two long sides of the blade body 110. When the cutter head drives the blade 100 to perform the cutting operation, the cutter head drives the blade 100 to perform centrifugal movement, so that the two blade portions 120 of the blade 100 can be in contact with the vegetation to ensure the cutting effect. At the same time, the two blade portions 120 can increase the contact area with the vegetation, improve the cutting efficiency, make the blade 100 use for a long time, reduce the number of times the blade 100 is replaced, and reduce the cost of the accessory. Of course, in other embodiments of the present invention, of course, the number of the blade portions 110 may be only one. The cutter head rotates the blade portion 120 to bring the blade portion 120 into contact with the vegetation, which also enables the lawn mower to cut the vegetation.

In other embodiments, the blade may be of other shapes, such as in the second embodiment shown in FIG. 3, the blade 200 is configured as a blade having two blades 40. In the third embodiment shown in FIG. 4, the blade 300 is provided as a blade having three blades 40. Each of the blades 40 of the blade of Figures 3 and 4 is arranged in accordance with the structure of Figure 1, the blade portion 120 is located at the outer edge of the blade body 110, and a corresponding blade portion 120 on each blade 40 may be provided. It may be provided as two, respectively located at the edge positions of the opposite ends of the blade body 110 on each of the blades. In other embodiments, the blade may also be provided with more blades 40 as shown in Figures 3 and 4, and the blades 40 may be arranged in other shapes or the entire blade may be arranged in other shapes depending on the actual situation.

In a specific embodiment, the cross-sectional area of the blade portion 120 is 0.1 to 0.6 times the cross-sectional area of the blade body 110. That is, it can be seen from the cross-sectional view in the cross-sectional direction shown in FIG. 2 that the cross-sectional area of the blade portion 120 can be small, as long as the cutting area of the blade portion 120 is ensured, and the blade portion 120 is reliably connected to the blade body 110. In this way, under the premise of ensuring the wear resistance of the blade 100, the production cost of the blade 100 is greatly reduced, the number of times the user frequently replaces the blade 100 is reduced, and the accessory cost is reduced.

In a specific embodiment, the blade portion 120 is a double-sided edge or a single-sided blade. When the blade portion 120 is a single-sided blade, one surface of the blade portion 120 is parallel to the surface of the blade body 110, and the other surface of the blade portion 120 is obliquely disposed and intersects with one surface of the blade portion 120, and the two surfaces intersect The end is the edge of the blade portion 120. When the blade portion 120 is a double-sided blade, the two surfaces of the blade portion 120 are obliquely intersected with each other, and the end portions where the two surfaces intersect are the blades of the blade portion 120. When the blade portion 120 is a double-sided blade, the cutting performance of the blade 100 is better.

In a specific embodiment, the blade body 110 is provided with a mounting hole 111. The lawn mower is provided with a fixing member. The fixing member passes through the mounting hole 111 to fix the blade body 110 to the cutter head. In the present invention, the mounting hole 111 is provided in the central portion of the blade body 110 to ensure that the blade 100 is fixedly secured. Also, the number of the mounting holes 111 is at least one, preferably at least two, so that the blade 100 can be securely fixed. In the embodiment, the number of the mounting holes 111 on the blade body 110 is two, and the two mounting holes 111 are arranged side by side on the blade body 110.

The present invention also provides a lawn mower comprising a cutter head and a blade 100 of the above embodiment fixed to the cutter head. The blade body 110 is provided with a mounting hole 111. The lawn mower is provided with a fixing member, and the fixing member is worn. A mounting hole 111 is provided to fix the blade 100 to the cutter head. The lawn mower of the present invention achieves mowing performance through the blade 100, and ensures mowing ability. After the blade 100 of the present invention adopts the above-mentioned blade 100, since the wear resistance of the blade 100 is good, the service life of the blade 100 can be prolonged, the number of times the user frequently replaces the blade 100 is reduced, the accessory cost is reduced, and the user is convenient to use. Further, the blade The specific shape and quantity may be determined according to actual conditions, and the number of blades may be several (including one), preferably at least two, and at least two blades are disposed on the cutter head. Thus, when the two blade portions 120 of one of the blades 100 are worn, the cutter head can be rotated, so that the other blades 100 on the cutter head cut the vegetation, so that the use time of the blade 100 is long, reducing the number of times the blade 100 is replaced, and reducing the number of times Attachment cost.

In one embodiment, the lawn mower is a smart lawn mower for automatic walking and mowing on the ground, including a housing, a walking system, a cutting system, a detection system, and a control system. The walking system includes a travel motor and wheels that are driven by a travel motor. The cutting system includes a cutting motor, a drive shaft coupled to the cutting motor, and a cutting device coupled to the drive shaft. The detection system is used to detect the position of the intelligent mower. The control system is used to control the operation of the walking system, cutting system and detection system. The cutting device includes a cutter head and a blade 100 in the above embodiment fixed to the cutter head. The blade body 110 is provided with a mounting hole 111. The smart lawn mower is provided with a fixing member, and the fixing member passes through the mounting hole 111 to fix the blade 100 to the cutter head. The specific shape and number of the blades may be determined according to actual conditions, and the number of blades may be several (including one), preferably at least two, at least two blades are disposed on the cutter head, and two blades of one of the blades 100 are provided. After the portion 120 is worn, the cutter head can be rotated so that the other blades 100 on the cutter head cut the vegetation, so that the blade 100 is used for a long time. Because the intelligent mower automatically walks and cuts grass on the grass, when the obstacle is encountered, the detection system may not detect or detect the delay or judge the error, resulting in an increase in the probability of the blade 100 colliding with the obstacle while working. The blade is easily damaged. In the present invention, by providing the blade 100 in the above embodiment on the intelligent lawn mower, after the intelligent lawn mower adopts the above-mentioned blade 100, since the wear resistance of the blade 100 is good, the service life of the blade 100 can be prolonged, and the user is frequently reduced. The number of times the blade 100 is replaced reduces the cost of the accessory and is convenient for the user. In other embodiments, the lawn mower can also be a hand-held lawn mower or a multi-function machine with a mowing function or the like.

The blade 100 of the present invention is combined by two materials to ensure that the blade body 110 has good wear resistance while ensuring good toughness of the blade body 110. When the lawn mower performs the mowing operation, the blade portion 120 is in contact with the vegetation for cutting. Since the blade portion 120 has rigidity and wear resistance, the cutting performance and wear resistance of the blade 100 can be enhanced, and the service life of the blade 100 is prolonged. Reduce the number of times the user replaces the blade 100 and reduce the cost of the accessory. The blade portion 120 of the blade 100 of the present invention is disposed at an outer edge position of the blade body 110, and the blade body 110 and the blade portion 120 are made of different materials. Since the blade portion 120 is used for cutting, it is necessary to ensure that the blade portion 120 has sufficient cutting performance. Since the lawn mower operates at a high speed, the blade body 110 needs to have sufficient impact strength, which can extend the service life of the blade 100. Reduce the number of times the user replaces the blade 100. Because of the two functions The material is difficult to select, and even if it is expensive, the invention adopts different materials to meet the respective needs through different parts of the demand, and while ensuring the life of the lifting blade, the material selection is convenient, and the material cost is reduced.

The above-mentioned embodiments are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims

A blade for use in a lawn mower, characterized in that the blade includes a blade portion for cutting and a blade body connecting the blade portion, the blade portion being located at an outer edge of the blade body, the blade The body and the blade portion are made of different materials.
The blade according to claim 1, wherein said lawn mower is a rotary cutting lawn mower.
The blade according to claim 1, wherein said lawn mower is a smart lawn mower provided with a casing, a traveling system, a cutting system, a detection system, and a control system.
A blade according to claim 1, wherein said blade body and said blade portion are made of a metal material.
The insert according to claim 1, wherein the material of the blade portion has a hardness ranging from HRC 56 to 75.
The insert according to claim 1, wherein the material of the blade portion has a hardness ranging from HRC 65 to 70.
The blade according to claim 1, wherein the material of the blade portion has a hardness of HRC65.
A blade according to claim 1 or 5 or 6 or 7, wherein the material of the blade body has a hardness ranging from 30 to 60 HRC.
The blade according to claim 8, wherein the material of the blade body has a hardness ranging from 40 to 50 HRC.
The blade according to claim 9, wherein the material of the blade body has a hardness of HRC50.
The blade according to claim 1, wherein the material of the blade portion has a wear resistance greater than that of the material of the blade body.
The blade according to claim 1, wherein the hardness of the material of the blade portion is greater than the hardness of the material of the blade body.
A blade according to claim 1 or 11 or 12, wherein the toughness of the material of the blade body is greater than the toughness of the material of the blade portion.
The blade according to claim 1, wherein said blade body is made of carbon steel.
A blade according to claim 1 or 14, wherein the blade portion is made of high speed steel or alloy tool steel.
The blade according to claim 1, wherein said blade portion is fixedly coupled to said blade body.
The blade according to claim 16, wherein said blade portion is welded and fixed to said blade body.
A blade according to claim 16, wherein the blade portion is fixed to the blade body by riveting on.
A blade according to claim 1 or 16 or 17 or 18, wherein the number of the blade portions is two.
The blade according to claim 19, wherein said two blade portions are respectively disposed at opposite ends of said blade body.
The blade according to claim 20, wherein said blade body is a rectangle having two long sides, and said blade portions are respectively disposed on said two long sides.
The insert according to claim 1, wherein a cross-sectional area of said blade portion is 0.1 to 0.6 times a sectional area of said blade body.
A blade according to claim 1, wherein said blade portion is a double-sided blade or a single-sided blade.
A blade according to claim 1, wherein said blade body is provided with a mounting hole through which said blade is fixed to said lawn mower.
A lawn mower comprising a cutter head and a blade fixed to the cutter head, wherein the blade includes a blade portion for cutting and a blade body connecting the blade portion, the blade portion being located The outer edge of the blade body, the blade body and the blade portion are made of different materials.
A lawn mower according to claim 25, wherein said lawn mower is a rotary cutting lawn mower.
A lawn mower according to claim 25, wherein said lawn mower is a smart lawn mower, said intelligent lawn mower comprising a casing, a walking system, a cutting system, a detecting system and a control system, The cutting system includes the cutter head and the blade secured to the cutter head.
The lawn mower according to claim 25, wherein the blade body and the blade portion are made of a metal material.
The lawn mower according to claim 25, wherein the material of the blade portion has a hardness ranging from HRC 56 to 75.
The lawn mower according to claim 25, wherein the material of the blade portion has a hardness ranging from HRC 65 to 70.
The lawn mower according to claim 25, wherein the material of the blade portion has a hardness of HRC65.
A lawn mower according to claim 25 or 29 or 30 or 31, wherein the material of the blade body has a hardness ranging from 30 to 60 HRC.
The lawn mower according to claim 32, wherein the material of the blade body has a hardness ranging from 40 to 50 HRC.
A lawnmower according to claim 33, wherein the material of the blade body has a hardness in the range of HRC50.
The lawn mower according to claim 25, wherein the material of the blade portion has a wear resistance greater than that of the material of the blade body.
A lawn mower according to claim 25, wherein the hardness of the material of the blade portion is greater than the hardness of the material of the blade body.
A lawn mower according to claim 25 or 35 or 36, wherein the toughness of the material of the blade body is greater than the toughness of the material of the blade portion.
A lawn mower according to claim 25, wherein said blade body is made of carbon steel.
A lawn mower according to claim 25 or claim 38, wherein the blade portion is made of high speed steel or alloy tool steel.
A lawn mower according to claim 25, wherein said blade portion is fixedly coupled to said blade body.
A lawn mower according to claim 40, wherein said blade portion is welded and fixed to said blade body.
A lawn mower according to claim 40, wherein said blade portion is fixed to said blade body by riveting.
A lawn mower according to claim 25 or 40 or 41 or 42, wherein the number of said blade portions is two.
The lawn mower according to claim 43, wherein the two blade portions are respectively disposed at opposite ends of the blade body.
A lawn mower according to claim 44, wherein said blade body is a rectangle having two long sides, and said blade portions are respectively disposed on said two long sides.
The lawn mower according to claim 25, wherein the cutting edge portion has a cross-sectional area of 0.1 to 0.6 times the sectional area of the blade body.
The lawn mower according to claim 25, wherein the blade portion is a double-sided blade or a single-sided blade.
A lawn mower according to claim 25, wherein said blade body is provided with a mounting hole, and said lawn mower further comprises a fixing member, said fixing member passing said blade through said mounting hole Fixed to the cutter head.
A lawn mower according to claim 25, wherein said lawn mower has at least two said blades, said blades being disposed on said cutter head.