Boundary cutting tool

Abstract

The utility model discloses a boundary cutting tool. The boundary cutting tool comprises a tool body, the tool body comprises a motor, a cutting blade and a protective cover, the cutting blade is arranged to be driven by the motor to rotate around a first axis a for cutting, the protective cover covers part of the cutting blade, the cutting blade comprises a mounting area and at least one tool arm, and the mounting area is provided with a mounting plane. The tool arm is provided with a first bent section and a second bent section, the first bent section is provided with a first bent line b, the second bent section is provided with a second bent line c, and the first bent line b is not parallel to the second bent line c. According to the boundary cutting tool, the tool arm is provided with the first bending section and the second bending section, and the first bending line b of the first bending section is not parallel to the second bending line c of the second bending section, so that the cutting efficiency of the boundary cutting tool is improved, the working time of a user is shortened, and the working intensity of the user is reduced; and the use experience of the user is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to an electric power tool, in particular to a boundary cutting tool. BACKGROUND

[0002] An electric power tool in the related art is a boundary cutting tool. Common boundary cutting tools include a borderer, a lawn edger, a trencher, and a lawn trimmer, etc. The boundary cutting tool is a device capable of trimming a clear boundary and clearly dividing the lawn and the adjacent bed area. The existing boundary cutting tool has the disadvantage of low cutting efficiency, which requires the user to spend a long time for cutting operation, increases the labor intensity of the user, and reduces the user experience.

[0003] This section provides background information relating to the present application, which can not necessarily be prior art. SUMMARY

[0004] An object of the present application is to solve or at least alleviate part or all of the above problems. To this end, an object of the present application is to provide a boundary cutting tool with high cutting efficiency.

[0005] To achieve the above object, the present application adopts the following technical solutions:

[0006] A boundary cutting tool, comprising: a tool body comprising: a motor; a cutting blade configured to be driven to rotate around a first axis a by the motor; a shroud covering part of the cutting blade; wherein the cutting blade comprises: a mounting region having a mounting plane; the cutting blade further comprises: at least one blade arm, the blade arm having a first curved segment and a second curved segment; the first curved segment has a first curved line b, and the second curved segment has a second curved line c; the first curved line b is not parallel to the second curved line c.

[0007] In some embodiments, the first curved segment is adjacent to the mounting region; and the second curved line c is away from the mounting region.

[0008] In some embodiments, the first curved line b is substantially perpendicular to a first region edge line d of the mounting region.

[0009] In some embodiments, an included angle D between the second curved line c and a second region edge line e of the blade arm is greater than or equal to 70° and less than 90°.

[0010] In some embodiments, the width of the cutting blade as a whole is substantially uniform.

[0011] In some embodiments, the width of the cutting blade as a whole is substantially 50 mm.

[0012] In some embodiments, the first curved segment and the second curved segment comprise a first elongated segment having a first elongated plane; an angle A between the first elongated plane and the mounting plane is greater than 90° and less than 110°.

[0013] In some embodiments, the other end of the second curved segment is adjacent to a second elongated segment having a second elongated plane; an end of the second elongated segment is set as a free end; the free end has a first side and a second side with a length greater than the first side; an angle B between the first side and a side of the second elongated segment is substantially set as 115°; an angle C between the second side and the side of the second elongated segment is substantially set as 100°.

[0014] In some embodiments, the cutting blade has a thickness substantially 5mm.

[0015] In some embodiments, the cutting blade is set as an integrally formed metal piece.

[0016] A boundary cutting tool, comprising: a tool body, comprising: a motor, set to generate driving force rotatable around a first axis a; a cutting blade, set to be driven by the motor to cut rotatable around the first axis a; a shroud, covering part of the cutting blade; wherein the cutting blade comprises: a mounting area, forming a mounting hole to mount the cutting blade to an output shaft of the motor; the cutting blade further comprises: at least one blade arm, the blade arm having a free end away from the mounting area; a top end of the free end has a first side and a second side with a length greater than the first side; the first side is substantially perpendicular to a first area edge line d of the mounting area.

[0017] In some embodiments, the blade arm has a first curved segment and a second curved segment; the first curved segment has a first curved line b, and the second curved segment has a second curved line c; the first curved line b is not parallel to the second curved line c.

[0018] In some embodiments, the first curved segment is adjacent to the mounting area; the second curved line c is away from the mounting area.

[0019] In some embodiments, the first curved line b is substantially perpendicular to the first area edge line d of the mounting area.

[0020] In some embodiments, an angle D between the second curved line c and a second area edge line e of the blade arm is greater than or equal to 70° and less than 90°.

[0021] In some embodiments, the first curved section and the second curved section comprise a first elongated section having a first elongated plane; the mounting region has a mounting plane, and an included angle A between the first elongated plane and the mounting plane is greater than 90° and less than 110°.

[0022] In some embodiments, the other end of the second curved section is immediately adjacent to a second elongated section having a second elongated plane; an end of the second elongated section is configured as a free end; the free end has a first side and a second side having a length greater than the first side; an included angle B between the first side and a side of the second elongated section is substantially configured as 115°; and an included angle C between the second side and the side of the second elongated section is substantially configured as 100°.

[0023] In some embodiments, the cutting blade has a substantially uniform width.

[0024] In some embodiments, the cutting blade has a substantially uniform width of 50 mm.

[0025] In some embodiments, the cutting blade has a thickness of 5 mm.

[0026] In some embodiments, the cutting blade is configured as a one-piece metal piece.

[0027] A boundary cutting tool, comprising: a tool body, comprising: a motor configured to generate a driving force rotatable about a first axis a; a cutting blade configured to be driven by the motor to rotate about the first axis a to cut a ground surface; a shroud covering a portion of the cutting blade; wherein the cutting blade comprises: a mounting region having a mounting plane; the cutting blade further comprises: at least one blade arm having a free end distal to the mounting region; the free end is formed with a cutting edge.

[0028] In some embodiments, the mounting region has a mounting surface facing a mounting position on the tool body; the blade arm has a cutting surface on the same side as the mounting surface; at least a portion of the cutting surface forms the cutting edge.

[0029] In some embodiments, the free end comprises a first cutting edge and a second cutting edge; the first cutting edge comprises at least a cutting edge that cuts the ground surface first in a rotational cutting direction, and the second cutting edge comprises a cutting edge that cuts the ground surface last in the rotational cutting direction; wherein at least a portion of the first cutting edge forms the cutting edge toward the cutting surface.

[0030] In some embodiments, the second cutting edge is substantially perpendicular to a first region edge line d of the mounting region.

[0031] In some embodiments, the first cutting edge forms the cutting edge with a width of at least 1 mm.

[0032] In some embodiments, the cutting edge has a clearance angle greater than or equal to 30° and less than or equal to 80°.

[0033] The present application has the advantages of:

[0034] The boundary cutting tool provided by the present application comprises a tool body, the tool body comprising a motor, a cutting blade and a shield, the cutting blade being arranged to be driven to rotate and cut around a first axis a by the motor, and the shield covering part of the cutting blade, wherein the cutting blade comprises a mounting region and at least one blade arm, the mounting region having a mounting plane, the blade arm having a first curved section and a second curved section, the first curved section having a first curved line b, and the second curved section having a second curved line c, and the first curved line b is not parallel to the second curved line c. By arranging the blade arm to have the first curved section and the second curved section, and arranging the first curved line b of the first curved section and the second curved line c of the second curved section to be not parallel, the cutting efficiency of the boundary cutting tool is improved, the working time of the user is reduced, the working strength of the user is reduced, and the user experience is improved. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a schematic view of a part of the structure of the boundary cutting tool;

[0036] Figure 2 is Figure 1 is a schematic view of the structure shown in another perspective view;

[0037] Figure 3 is a schematic view of the cutting blade in a first perspective view;

[0038] Figure 4 is a schematic view of the cutting blade in a second perspective view;

[0039] Figure 5 is a schematic view of the cutting blade in a third perspective view;

[0040] Figure 6 is a schematic view of the cutting blade in a fourth perspective view.

[0041] In the drawings:

[0042] 10, tool body; 20, guide tube;

[0043] 100, motor;

[0044] 200, cutting blade; 210, mounting area; 211, mounting plane; 212, mounting surface; 213, mounting hole; 220, blade arm; 221, first curved section; 222, second curved section; 223, first extended section; 2231, first extension plane; 224, second extended section; 2241, second extension plane; 2242, first edge; 2243, second edge; 2244, cutting surface; 225, cutting edge; 2251, first cutting edge; 2252, second cutting edge;

[0045] 300, shroud; 310, shroud body; 311, body structure; 312, protruding structure; 320, protective rubber; 330, bolt;

[0046] 400, walking wheel. DETAILED DESCRIPTION

[0047] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above-described drawings.

[0048] In this application, the terms "include", "comprise", "have", or any other variants thereof are intended to cover non-exclusive inclusions, such that processes, methods, articles, or apparatuses that include a series of elements are not limited to those elements, but also include other elements not explicitly listed, or further include elements inherent in such processes, methods, articles, or apparatuses. Without more limitations, the element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0049] In this application, the term "and / or", is a description of the association relationship between the associated objects, which means that there can be three kinds of relationships. For example, A and / or B, can represent the following three cases: A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this application generally represents a "and / or" relationship between the front and rear associated objects.

[0050] In this application, the terms "connection", "combination", "coupling", "mounting" can be direct connection, combination, coupling or mounting, or indirect connection, combination, coupling or mounting. Among them, direct connection refers to the connection of two parts or components without the need for an intermediate part, and indirect connection refers to the connection of two parts or components with at least one intermediate part. In addition, "connection" and "coupling" are not limited to physical or mechanical connection or coupling, and can include electrical connection or coupling.

[0051] In this application, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the values ​​and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​not using relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0052] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0053] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0054] This application discloses a boundary cutting tool that can be used to mow lawns, creating a clear boundary between the lawn surface and adjacent bed areas. Figures 1 to 2 As shown, the boundary cutting tool includes a tool body 10, a guide tube 20, and a handle (not shown). The tool body 10 is connected to the bottom end of the guide tube 20, and the handle is located on the guide tube 20, near or directly at the top end of the guide tube 20. The user can operate the boundary cutting tool by holding the handle. A grip (not shown) is also provided at or near the handle, allowing the user to hold the handle with one hand and the grip with the other for more stable operation. An accelerator lever (not shown) and an accelerator lock lever (not shown) are also provided at the handle.

[0055] likeFigure 1 and Figure 2 As shown, the tool body 10 includes a motor 100, a cutting blade 200, and a protective cover 300. The motor 100 is configured to rotate around a first axis a to generate driving force, and the cutting blade 200 is configured to be driven by the motor 100 to rotate around the first axis a for cutting. The protective cover 300 covers a portion of the cutting blade 200. The motor 100 can be an internal combustion engine or an electric motor.

[0056] In some embodiments, the output shaft of the motor 100 is directly connected to the cutting blade 200. In other embodiments, to shift the center of gravity of the boundary cutting tool upwards and reduce the difficulty of operation for the user, a motor housing is provided at the top of the guide tube 20, and the motor 100 is installed inside the motor housing. A centrifugal clutch (not shown) and a starting device (not shown) are also installed inside the motor housing. A drive shaft (not shown) is also provided inside the guide tube 20. The motor 100 is driven by one end of the drive shaft through the centrifugal clutch, and the other end of the drive shaft is driven by the cutting blade 200, so that the driving force of the motor 100 can be transmitted to the cutting blade 200. The starting device can be a cable starter.

[0057] like Figures 3 to 6 As shown, the cutting blade 200 includes a mounting area 210 and at least one blade arm 220. The blade arm 220 has a free end away from the mounting area 210 and a connecting end adjacent to the mounting area 210. The mounting area 210 is the area on the cutting blade 200 that is driven to the motor 100. The mounting area 210 has a mounting plane 211 and a mounting hole 213 formed therein. In one embodiment, the cutting blade 200 can be directly mounted to the output shaft of the motor 100 through the mounting hole 213. In another embodiment, the other end of the drive shaft is driven to the cutting blade 200 through a gear assembly, and the mounting hole 213 is used to mount the cutting blade 200 to the gear shaft of the gear assembly.

[0058] In some embodiments, the cutting blade 200 has two blade arms 220, which are located on opposite sides of the mounting area 210 and are generally W-shaped. In another embodiment, there is one blade arm 220, which is located on one side of the mounting area 210 and is generally V-shaped.

[0059] In some embodiments, the knife arm 220 has a first curved section 221 and a second curved section 222, the first curved section 221 can be independent of the adapter end or can be included in the adapter end, the first curved section 221 has a first curved line b, and the second curved section 222 has a second curved line c; the first curved line b is not parallel to the second curved line c. Compared with the cutting blade in the prior art, the boundary cutting tool disclosed in the present application improves the cutting efficiency of the boundary cutting tool, reduces the working time of the user, reduces the working strength of the user, and improves the user experience by setting the knife arm 220 to have the first curved section 221 and the second curved section 222, and setting the first curved line b of the first curved section 221 and the second curved line c of the second curved section 222 to be not parallel. It should be noted that the first curved line b and the second curved line c are both straight lines. The first curved line b is a geometric line used to represent the bending position and bending shape of the first curved section 221, and the second curved line c is a geometric line used to represent the bending position and bending shape of the second curved section 222. Alternatively, it can be understood that the first curved line b represents a straight line formed by the vertex of the curved surface of the first curved section 221, and the second curved line c represents a straight line formed by the vertex of the curved surface of the first curved section 222.

[0060] In some embodiments, the first curved section 221 is adjacent to the mounting area 210; and the second curved line c is away from the mounting area 210.

[0061] In some embodiments, the first curved line b is substantially perpendicular to the first area edge line d of the mounting area 210. That is, as shown in Figure 5 , the included angle E between the first curved line b and the first area edge line d of the mounting area 210 is substantially 90°.

[0062] In some embodiments, continuing to refer to Figure 5 , the included angle D between the second curved line c and the second area edge line e of the knife arm 220 is greater than or equal to 70° and less than 90°. In a specific embodiment, the included angle D between the second curved line c and the second area edge line e of the knife arm 220 is 70°, 71°, 72°, 73°, 74°, 75°, 76°, 77°, 78°, 79°, 80°, 81°, 82°, 83°, 84°, 85°, 86°, 87°, 88°, 89° or 90°. Of course, in other embodiments, the included angle D between the second curved line c and the second area edge line e of the knife arm 220 can also be set to other values within the range of 70°-90° according to requirements.

[0063] In some embodiments, the width of the cutting blade 200 as a whole is substantially uniform. In a specific embodiment, the width of the cutting blade 200 as a whole is substantially 50 mm. Of course, in other embodiments, the width of the cutting blade 200 as a whole can also be adjusted according to requirements.

[0064] In some embodiments, the knife arm 220 further has a first stretch section 223, which is located between the first bending section 221 and the second bending section 222, and the first stretch section 223 comprises a first stretch plane 2231.

[0065] Continuing to refer to Figure 3 As shown, an included angle A between the first stretch plane 2231 and the mounting plane 211 is greater than 90° and less than 110°. In one specific embodiment, the included angle A between the first stretch plane 2231 and the mounting plane 211 is 91°, 92°, 93°, 94°, 95°, 96°, 97°, 98°, 99°, 100°, 101°, 102°, 103°, 104°, 105°, 106°, 107°, 108°, 109° or 110°. Of course, in other embodiments, the included angle A between the first stretch plane 2231 and the mounting plane 211 can also be set to other values within the range of 90°-110° according to requirements.

[0066] In some embodiments, the knife arm 220 has a second stretch section 224, which is located next to the second bending section 222 and at the other end of the second bending section 222 away from the first stretch section 223, and the second stretch section 224 comprises a second stretch plane 2241.

[0067] Continuing to refer to Figure 6 As shown, the end of the second stretch section 224 is set as a free end, which has a first side 2242 and a second side 2243 with a length greater than the first side 2242. In one embodiment, an included angle B between the first side 2242 and the side of the second stretch section 224 is substantially set as 115°; and an included angle C between the second side 2243 and the side of the second stretch section 224 is substantially set as 100°. Of course, in other embodiments, the included angle B between the first side 2242 and the side of the second stretch section 224 can be adjusted according to requirements; and the included angle C between the second side 2243 and the side of the second stretch section 224 can also be adjusted according to requirements.

[0068] Further, the first side 2242 is substantially perpendicular to the first area edge line d of the mounting area 210. That is, the included angle between the straight line where the first side 2242 is located and the straight line where the first area edge line d of the mounting area 210 is located is 90°.

[0069] In some embodiments, continuing to refer to Figure 4As shown, the free end forms a cutting edge 225. In one embodiment, the mounting region 210 has a mounting surface 212 facing the mounting location on the tool body 10; the blade arm 220 has a cutting surface 2244 on the same side as the mounting surface 212; at least a portion of the cutting surface 2244 forms the cutting edge 225.

[0070] In some embodiments, the free end includes a first cutting edge 2251 and a second cutting edge 2252; the first cutting edge 2251 includes at least a cutting edge that cuts the ground first in the direction of rotation, and the second cutting edge 2252 includes a cutting edge that cuts the ground last in the direction of rotation. At least a portion of the first cutting edge 2251 forms the cutting edge 225 towards the cutting surface 2244. That is, the first cutting edge 2251 is a cutting edge that contacts the ground first (may include the first and second contact) and can cut the ground in the direction of rotation of the cutting blade 200; and the second cutting edge 2252 is a cutting edge that contacts the ground last and forms a perpendicular cutting line in the direction of rotation of the blade.

[0071] In one embodiment, continuing to refer to Figure 4 As shown, the first cutting edge 2251 is provided with two, the two first cutting edges 2251 are arranged at an angle, one of the first cutting edges 2251 contacts the ground first, and the other first cutting edge 2251 contacts the ground second.

[0072] In some embodiments, the second cutting edge 2252 is substantially perpendicular to the first region edge line d of the mounting region 210. Such an arrangement allows the second cutting edge 2252 to form a perpendicular surface contact with the ground, which is beneficial for reducing wear. The perpendicular surface contact can be understood as follows: when the cutting tool is turned on, the corners of the two first cutting edges 2251 contact the ground first, and as the cutting blade 200 continues to rotate, the angle between the second cutting edge 2252 and the ground is substantially 90°, the second cutting edge 2252 is substantially perpendicular to the ground, that is, a perpendicular surface contact is formed.

[0073] In some embodiments, the first cutting edge 2251 has a width of at least 1 mm to form the cutting edge 225. In some embodiments, the first cutting edge 2251 has a width of at least 1.5 mm to form the cutting edge 225. In some embodiments, the first cutting edge 2251 has a width of at least 2 mm to form the cutting edge 225. For a cutting blade 200 that is substantially "W" shaped, the first cutting edge 2251 forms the cutting edge 225, which is easier to cut an opening in the ground when the cutting blade 200 rotates to cut the ground.

[0074] In some embodiments, the cutting edge 225 has a clearance angle greater than or equal to 30° and less than or equal to 80°. In some embodiments, the cutting edge 225 has a clearance angle greater than or equal to 30° and less than or equal to 60°. In some embodiments, the cutting edge 225 has a clearance angle greater than or equal to 60° and less than or equal to 80°.

[0075] In one specific embodiment, the cutting edge 225 has a clearance angle of 30°, 31°, 32°, 33°, 34°, 35°, 36°, 37°, 38°, 39°, 40°, 41°, 42°, 43°, 44°, 45°, 46°, 47°, 48°, 49°, 50°, 51°, 52°, 53°, 54°, 55°, 56°, 57°, 58°, 59°, 60°, 61°, 62°, 63°, 64°, 65°, 66°, 67°, 68°, 69°, 70°, 71°, 72°, 73°, 74°, 75°, 76°, 77°, 78°, 79°, or 80°. Of course, in other embodiments, the cutting edge 225 can have other values within the range of 30°-80°.

[0076] In some embodiments, the cutting blade 200 has a substantially uniform thickness. In one specific embodiment, the cutting blade 200 has a substantially uniform thickness of 5mm. Of course, in other embodiments, the cutting blade 200 can have other values depending on the requirements.

[0077] In one specific embodiment, the cutting blade 200 has a free end with a cutting edge 225, the cutting blade 200 has a thickness of about 5mm, and in the thickness direction, there is a clearance of about 3.5mm to form the cutting edge 225, and the clearance has an inclination angle (i.e., clearance angle) of substantially 60°. In addition to the clearance of about 3.5mm to form the cutting edge 225, there is also a flat surface of about 1.5mm, and the flat surface is substantially perpendicular to the cutting surface 2244.

[0078] In some embodiments, the cutting blade 200 is provided as an integrally formed metal piece. In some embodiments, the cutting blade 200 is made from a single slab, and the cutting blade 200 is formed into an approximate W-shaped design with two blade arms 220, or an approximate V-shaped design with one blade arm 220, by processing the slab.

[0079] The shroud 300 is used to protect the cutting blade 200. Continuing to refer to Figure 1 and Figure 2As shown, the shield 300 includes a shield body 310 and a protective rubber 320, the shield body 310 forms a containing space containing the cutting blade 200, the protective rubber 320 is arranged at one end of the shield body 310, and is located close to the user, preventing the debris generated when the cutting blade 200 rotates and cuts from flying to the user, and can protect the user.

[0080] In some embodiments, continuing to refer to Figure 2 As shown, the protective rubber 320 is a 9-shaped rubber, and the 9-shaped rubber has a first assembly hole, and the shield body 310 is provided with a second assembly hole, and the bolt 330 passes through the first assembly hole and the second installation hole 213, thereby fixing the 9-shaped rubber on the shield body 310. In some embodiments, a set of self-tapping screws can also be used to be fixed on the second installation hole 213 on both sides, so as to install the protective rubber 320 on the fender, wherein the fender is arranged as a component extending to the rear side of the shield body 310 to block the mud from being thrown backward.

[0081] In some embodiments, continuing to refer to Figure 2 As shown, the rear side of the shield body 310 is formed with a protruding structure 312, the protruding structure 312 is integrally formed with the main body structure 311 of the shield body 310, and the protruding structure 312 is mainly used for installing the protective rubber 320, avoiding the protective rubber 320 being cut off when the cutting blade 200 rotates.

[0082] Continuing to refer to Figure 1 and Figure 2 As shown, the boundary cutting tool further includes a walking wheel 400, the walking wheel 400 is rotatably installed on the shield body 310, and the walking wheel 400 can roll on the ground, and by arranging the walking wheel 400, the walking difficulty of the boundary cutting tool can be reduced, and the walking flexibility is improved.

[0083] The basic principles, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the above embodiments do not limit the present application in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present application.

Claims

1. A boundary cutting tool, comprising: The main body of the tool (10) includes: Motor (100); The cutting blade (200) is configured to be driven by the motor (100) to rotate and cut about a first axis a; A protective cover (300) partially covers the cutting blade (200); The cutting blade (200) includes: The mounting area (210) has a mounting surface (211); The cutting blade (200) is characterized in that it further includes: At least one cutting arm (220), the cutting arm (220) having a first curved section (221) and a second curved section (222); The first curved segment (221) has a first curved line b, and the second curved segment (222) has a second curved line c; The first curved line b is not parallel to the second curved line c.

2. The boundary cutting tool according to claim 1, characterized in that, The first curved segment (221) is adjacent to the mounting area (210); the second curved line c is away from the mounting area (210).

3. The boundary cutting tool according to claim 1, characterized in that, The first curved line b is substantially perpendicular to the first region edge line d of the mounting area (210).

4. The boundary cutting tool according to claim 1, characterized in that, The angle D between the second curved line c and the edge line e of the second region of the blade arm (220) is greater than or equal to 70° and less than 90°.

5. The boundary cutting tool according to claim 1, characterized in that, The width of the cutting blade (200) is basically the same.

6. The boundary cutting tool according to claim 1, characterized in that, The overall width of the cutting blade (200) is approximately 50 mm.

7. The boundary cutting tool according to claim 1, characterized in that, The first bending segment (221) and the second bending segment (222) include a first extension segment (223) having a first extension plane (2231); the included angle A between the first extension plane (2231) and the mounting plane (211) is greater than 90° and less than 110°.

8. The boundary cutting tool according to claim 7, characterized in that, The other end of the second curved segment (222) is adjacent to the second extended segment (224) having the second extended plane (2241); the end of the second extended segment (224) is set as a free end; the free end has a first side (2242) and a second side (2243) with a length greater than the first side (2242); the angle B between the first side (2242) and the side of the second extended segment (224) is basically set to 115°; the angle C between the second side (2243) and the side of the second extended segment (224) is basically set to 100°.

9. The boundary cutting tool according to claim 1, characterized in that, The thickness of the cutting blade (200) is approximately 5 mm.

10. The boundary cutting tool according to claim 1, characterized in that, The cutting blade (200) is a one-piece molded metal part.

11. A boundary cutting tool, comprising: The main body of the tool (10) includes: The motor (100) is configured to rotate about the first axis a to generate driving force; The cutting blade (200) is configured to be driven by the motor (100) to rotate and cut about the first axis a; A protective cover (300) partially covers the cutting blade (200); The cutting blade (200) includes: The mounting area (210) forms a mounting hole (213) for mounting the cutting blade (200) to the output shaft of the motor (100); The cutting blade (200) is characterized in that it further includes: At least one cutting arm (220) having a free end remote from the mounting area (210); The top of the free end has a first side (2242) and a second side (2243) with a length greater than the first side (2242); The first side (2242) is substantially perpendicular to the first region edge line d of the mounting area (210).

12. The boundary cutting tool according to claim 11, characterized in that, The blade arm (220) has a first curved section (221) and a second curved section (222); the first curved section (221) has a first curved line b, and the second curved section (222) has a second curved line c; the first curved line b and the second curved line c are not parallel.

13. The boundary cutting tool according to claim 12, characterized in that, The first curved segment (221) is adjacent to the mounting area (210); the second curved line c is away from the mounting area (210).

14. The boundary cutting tool according to claim 12, characterized in that, The first curved line b is substantially perpendicular to the first region edge line d of the mounting area (210).

15. The boundary cutting tool according to claim 12, characterized in that, The angle D between the second curved line c and the edge line e of the second region of the blade arm (220) is greater than or equal to 70° and less than 90°.

16. The boundary cutting tool according to claim 12, characterized in that, The first curved segment (221) and the second curved segment (222) include a first extended segment (223) having a first extended plane (2231); the mounting area (210) has a mounting plane (211), and the included angle A between the first extended plane (2231) and the mounting plane (211) is greater than 90° and less than 110°.

17. The boundary cutting tool according to claim 16, characterized in that, The other end of the second curved segment (222) is adjacent to the second extended segment (224) having the second extended plane (2241); the end of the second extended segment (224) is set as a free end; the free end has a first side (2242) and a second side (2243) with a length greater than the first side (2242); the angle B between the first side (2242) and the side of the second extended segment (224) is basically set to 115°; the angle C between the second side (2243) and the side of the second extended segment (224) is basically set to 100°.

18. The boundary cutting tool according to claim 11, characterized in that, The width of the cutting blade (200) is basically the same.

19. The boundary cutting tool according to claim 11, characterized in that, The overall width of the cutting blade (200) is approximately 50 mm.

20. The boundary cutting tool according to claim 11, characterized in that, The thickness of the cutting blade (200) is approximately 5 mm.

21. The boundary cutting tool according to claim 11, characterized in that, The cutting blade (200) is a one-piece molded metal part.

22. A boundary cutting tool, comprising: The main body of the tool (10) includes: The motor (100) is configured to rotate about the first axis a to generate driving force; The cutting blade (200) is configured to be driven by the motor (100) to rotate about the first axis a to cut the ground; A protective cover (300) partially covers the cutting blade (200); The cutting blade (200) includes: The mounting area (210) has a mounting surface (211); The cutting blade (200) is characterized in that it further includes: At least one blade arm (220) having a free end away from the mounting area (210); the free end is formed with a cutting edge (225).

23. The boundary cutting tool according to claim 22, characterized in that, The mounting area (210) has a mounting surface (212) facing the mounting position on the tool body (10); the blade arm (220) has a cutting surface (2244) on the same side as the mounting surface (212); at least a portion of the cutting surface (2244) forms the cutting blade (225).

24. The boundary cutting tool according to claim 23, characterized in that, The free end includes a first cutting edge (2251) and a second cutting edge (2252); the first cutting edge (2251) includes at least a cutting edge that first cuts the ground along the rotational cutting direction, and the second cutting edge (2252) includes a cutting edge that last cuts the ground along the rotational cutting direction; wherein at least a portion of the first cutting edge (2251) forms the cutting blade (225) facing the cutting surface (2244).

25. The boundary cutting tool according to claim 24, characterized in that, The second cutting edge (2252) is substantially perpendicular to the first region edge line d of the mounting area (210).

26. The boundary cutting tool according to claim 24, characterized in that, The first cutting edge (2251) has a width of at least 1 mm to form the cutting blade (225).

27. The boundary cutting tool according to claim 22, characterized in that, The cutting edge (225) has an opening angle greater than or equal to 30° and less than or equal to 80°.

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