A type of grass trimmer and grass trimmer

Abstract

This utility model provides a grass trimming head and a grass trimmer, belonging to the technical field of grass trimming devices. It includes: an output component with a mounting portion fixedly disposed on it, and a connecting post fixedly disposed on the mounting portion; a grass trimming blade with a connecting portion, the connecting portion including a mounting hole and a passage hole that are interconnected, the diameter of the mounting hole being smaller than the diameter of the passage hole, so that the connecting post passes through the passage hole and engages with the mounting hole, thereby installing the grass trimming blade onto the output component; the connecting portion also includes an abutting protrusion disposed on the side of the grass trimming blade; the advantage is that the presence of the abutting protrusion ensures that when the grass trimming blade moves laterally a certain distance, the abutting protrusion will abut against the side of the mounting portion, preventing the connecting portion on the grass trimming blade from continuing to move and causing the connecting post to detach from the mounting hole, thus allowing the grass trimming blade to detach from the rotating grass trimming head, greatly reducing the risk of the grass trimming blade accidentally detaching during high-speed rotation.

Description

Technical Field

[0001] This utility model belongs to the technical field of grass trimming devices, and in particular relates to a grass trimming head and a grass trimming machine. Background Technology

[0002] A lawn mower (also known as a lawn trimmer) is a mechanical device used to trim large areas of vegetation such as lawns and meadows. Compared with traditional hand mowing tools such as sickles, lawn mowers can complete a larger workload in a shorter time, greatly improving work efficiency and promoting the healthy growth of lawns. They are an important tool for maintaining garden landscapes.

[0003] Publication number CN220457937U discloses a centrifugal grass trimmer head, which specifically discloses that the quick-installation hole 201 and the pivot hole 202 of the grass trimmer blade 200 form a gourd-shaped hole design with one large and one small hole. When installing the grass trimmer blade 200, it is first fitted onto the pivot component 300 based on the quick-installation hole 201, and then the blade is pulled laterally to squeeze the rotating groove 301 of the pivot component 300 into the pivot hole 202, thus completing the installation of the grass trimmer blade 200 and realizing the quick installation of the grass trimmer blade. However, the above structure also has the risk of use. That is, if the grass trimmer blade is hit by an object and a lateral force is generated on the grass trimmer blade, the grass trimmer blade may move laterally and detach from the connection with the pivot component. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a grass-cutting head that prevents grass-cutting blades from detaching due to lateral forces.

[0005] The objective of this utility model can be achieved through the following technical solution: a grass trimmer, comprising:

[0006] An output component, wherein a mounting portion is fixedly provided on the output component, and a connecting post is fixedly provided on the mounting portion;

[0007] The grass trimmer blade has a connecting portion, which includes a mounting hole and a passage hole that are interconnected. The diameter of the mounting hole is smaller than the diameter of the passage hole, so that the connecting post passes through the passage hole and engages with the mounting hole to fix the grass trimmer blade to the output component. The connecting portion also includes an abutting protrusion on the side of the grass trimmer blade.

[0008] When the grass-cutting blade moves relative to the mounting part, the abutting protrusion will abut against the mounting part to prevent the connecting post from disengaging from the mounting hole.

[0009] In the aforementioned grass trimmer head, two abutting protrusions are provided. The two abutting protrusions are respectively provided on opposite sides of the grass trimmer blade and are symmetrically arranged. However, only one abutting protrusion can contact and connect with the mounting part at any time.

[0010] In one of the above-mentioned grass trimming heads, along the radial direction of the output component, the outer surface of the mounting part is an arc-shaped surface, and the center of the outer surface of the mounting part is located on the central axis of the connecting column.

[0011] In the aforementioned grass trimmer, the side of the mounting part with the connecting post is connected to the outer side of the mounting part in the radial direction of the output component via a guide surface, and the guide surface is arranged at an inclination relative to the two sides of the mounting part.

[0012] In one of the above-mentioned grass trimmer heads, the mounting part has an abutment recess on one side of the connecting post, and the abutment protrusion can extend into the abutment recess; wherein, when the grass trimmer blade moves, the abutment protrusion can abut against the side of the mounting part; along the axial direction of the output member, the grass trimmer blade deforms in a direction away from the abutment recess, so that the abutment protrusion can extend into the abutment recess.

[0013] In the aforementioned grass trimmer head, the connecting part includes a connecting surface, the abutting protrusion is disposed on the connecting surface, and the abutting recess has a bottom wall. When the grass trimmer blade is installed on the output component, with the connecting surface as the reference surface, the straight-line distance between the end face of the abutting protrusion away from the connecting surface and the connecting surface is greater than the straight-line distance between the bottom wall and the connecting surface.

[0014] In one of the above-mentioned grass trimming heads, when the grass trimming blade is installed on the output component, a gap is left between the abutting protrusion and the side of the mounting part, and the length of the gap between the abutting protrusion and the mounting part is less than the diameter of the mounting hole.

[0015] In one of the above-mentioned grass trimming heads, the first end of the connecting post is connected to the grass trimming blade, the second end of the connecting post is riveted and fixed to the mounting part, the back of the mounting part is provided with a mounting cavity, and the second end of the connecting post is hidden in the mounting cavity.

[0016] In one of the above-mentioned grass trimming heads, a reinforcing ring is provided inside the mounting cavity, and a reinforcing rib is fixedly provided between the reinforcing ring and the cavity wall of the mounting cavity.

[0017] A lawn mower, comprising the aforementioned mowing head.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: the presence of the abutting protrusion ensures that when the grass trimmer blade moves laterally by a certain distance, the abutting protrusion will abut against the side of the mounting part, preventing the connecting part on the grass trimmer blade from continuing to move and causing the connecting post to detach from the mounting hole, thereby causing the grass trimmer blade to detach from the grass trimmer head in the rotating state, greatly reducing the risk of the grass trimmer blade accidentally detaching in the high-speed rotating state. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the grass-cutting head;

[0020] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure;

[0021] Figure 3 This is a three-dimensional structural diagram of a grass-cutting blade;

[0022] Figure 4 This is a planar schematic diagram of the output component;

[0023] Figure 5 This is a three-dimensional structural diagram of the output component;

[0024] Figure 6 This is a schematic diagram showing the state of the installation section before the connecting columns are installed.

[0025] In the diagram, 100 is the output component; 101 is the mounting part; 102 is the connecting post; 103 is the abutting recess; 104 is the guide surface; 200 is the grass trimmer blade; 202 is the connecting part; 203 is the abutting protrusion; 204 is the connecting surface; 205 is the mounting cavity; 206 is the reinforcing ring; 207 is the reinforcing rib; 208 is the passageway hole; and 209 is the mounting hole. Detailed Implementation

[0026] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0027] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0028] like Figure 1 and Figure 6 As shown, a type of grass trimming head includes:

[0029] Output component 100, with mounting part 101 fixedly provided on output component 100, and connecting post 102 fixedly provided on mounting part 101;

[0030] The grass trimmer blade 200 has a connecting part 202. The connecting part 202 includes a mounting hole 209 and a passage hole 208 that are interconnected. The diameter of the mounting hole 209 is smaller than the diameter of the passage hole 208, so that the connecting post 102 passes through the passage hole 208 and engages with the mounting hole 209 to fix it, thereby installing the grass trimmer blade 200 onto the output component 100. The connecting part 202 also includes an abutting protrusion 203 provided on the side of the grass trimmer blade 200.

[0031] When the grass trimmer blade 200 moves relative to the mounting part 101, the abutting protrusion 203 will abut against the mounting part 101 to prevent the connecting post 102 from disengaging from the mounting hole 209.

[0032] In this embodiment, the presence of the abutting protrusion 203 ensures that when the grass trimmer blade 200 moves laterally a certain distance, the abutting protrusion 203 will abut against the side of the mounting part 101, preventing the connecting part 202 on the grass trimmer blade 200 from continuing to move and causing the connecting post 102 to detach from the mounting hole 209, thereby causing the grass trimmer blade 200 to detach from the grass trimmer head in the rotating state, greatly reducing the risk of the grass trimmer blade 200 accidentally detaching in the high-speed rotating state.

[0033] More preferably, there are two abutting protrusions 203. The two abutting protrusions 203 are respectively disposed on opposite sides of the grass trimmer blade 200 and are symmetrically arranged. However, only one abutting protrusion 203 can abut and connect with the mounting part 101 at a time.

[0034] In this embodiment, the two abutting protrusions 203 are symmetrically arranged. This design ensures that during use, regardless of the direction in which the trimmer blade 200 is installed, at least one abutting protrusion 203 will be in contact with the mounting part 101. The presence of the two abutting protrusions 203 allows the trimmer blade 200 to maintain uniform axial force during operation, improving the working efficiency and service life of the equipment. Furthermore, users do not need to distinguish between the front and back sides when installing the trimmer blade 200, simplifying the installation process. More importantly, even if one abutting protrusion 203 is damaged, the user can flip the trimmer blade 200 to continue using the other intact abutting protrusion 203, increasing the product's durability and reliability.

[0035] More preferably, along the radial direction of the output member 100, the outer surface of the mounting part 101 is an arc-shaped surface, and the center of the outer surface of the mounting part 101 is located on the central axis of the connecting column 102.

[0036] In this embodiment, the side of the mounting part 101 is designed to be arc-shaped, and in the radial direction, the center of the outer side of the mounting part 101 is located on the axis of the connecting post 102. That is, the straight-line distance between each position on the side of the mounting part 101 and the axis of the connecting post 102 is equal. Therefore, even if the grass trimmer blade 200 rotates relative to the connecting post 102, the abutting protrusion 203 can still maintain abutment and anti-disengagement function with the mounting part 101.

[0037] It is worth mentioning that the abutting protrusion 203 needs to abut against the mounting part 101 to avoid excessive deformation of the grass trimmer blade 200. As an alternative, the abutting post can be set as a circular post, in which case the abutting post and the mounting part 101 will have linear contact. Although the contact area is small and the contact method is clear, it is easier to achieve precise alignment.

[0038] Preferably, the side of the mounting part 101 with the connecting post 102 is connected to the outer side of the mounting part in the radial direction of the output component via a guide surface 104, and the guide surface is arranged at an angle relative to the two sides of the mounting part 101.

[0039] In this embodiment, the cross-section of the guide surface 104 can be an arc-shaped surface or a plane. In this application, the cross-section of the guide surface 104 is set to be an arc-shaped surface. The existence of the guide surface 104 is so that during the removal of the grass trimmer blade 200, the abutment protrusion 203 can smoothly move from the side of the mounting part 101 to the side of the mounting part 101 where the connecting post 102 is provided.

[0040] In a further preferred embodiment, the mounting part 101 is provided with an abutment recess 103 on one side where the connecting post 102 is provided, and the abutment protrusion 203 can extend into the abutment recess 103; wherein, when the grass trimmer blade 200 moves, the abutment protrusion 203 can abut against the side of the mounting part 101; along the axial direction of the output member 100, the grass trimmer blade 200 deforms in a direction away from the abutment recess 103, so that the abutment protrusion 203 can extend into the abutment recess 103.

[0041] It should be noted that the abutting recess 103 is an abutting groove provided on the mounting part 101.

[0042] In this embodiment, the mounting part 101 has an abutment recess 103 on one side where the connecting post 102 is provided. After the grass trimmer blade 200 is deformed, the abutment protrusion 203 can extend into the abutment recess 103. When the connecting post 102 extends into the passage hole 208 and connects with the mounting hole 209, or when the connecting post 102 is withdrawn from the mounting hole 209 into the passage hole 208, the grass trimmer blade 200 only needs to be slightly deformed upwards to push the grass trimmer blade 200 horizontally, which facilitates the installation or removal of the grass trimmer blade 200. Moreover, when the grass trimmer blade 200 is in its normal extended state, the abutment protrusion 203 cannot extend into the abutment recess 103. Therefore, during the use of the grass trimmer blade 200, if the grass trimmer blade 200 becomes disconnected from the connecting post 102, the side of the mounting part 101 can still abut against the abutment protrusion 203 to prevent it from coming off.

[0043] Specifically, the connecting part 202 includes a connecting surface 204, an abutting protrusion 203 disposed on the connecting surface 204, and an abutting recess 103 having a bottom wall. When the grass trimmer blade 200 is installed on the output component 100, with the connecting surface 204 as the reference surface, the straight-line distance between the end face of the abutting protrusion 203 away from the connecting surface 204 and the connecting surface 204 is greater than the straight-line distance between the bottom wall and the connecting surface 204.

[0044] In this embodiment, as Figure 2 As shown, along the axial direction of the output member 100, there is a drop between the end of the abutting protrusion 203 and the bottom of the abutting recess 103. Therefore, the bottom wall of the abutting recess 103 will obstruct the movement of the abutting protrusion 203 and prevent the grass-cutting blade 200 from falling off the grass-cutting head.

[0045] It should be noted that when there are two abutting protrusions 203, the connecting part 202 is provided with two connecting surfaces 204.

[0046] More preferably, when the grass trimmer blade 200 is installed on the output component 100, a gap is left between the abutting protrusion 203 and the side of the mounting portion 101, and the length of the gap between the abutting protrusion 203 and the mounting portion 101 is less than the diameter of the mounting hole 209.

[0047] In this embodiment, if the connecting post 102 extends into the mounting hole 209 and the abutting protrusion 203 directly contacts and connects with the mounting part 101, then during the process of removing the connecting post 102 from the mounting hole 209 or extending the connecting post 102 into the mounting hole 209, the grass trimmer blade 200 needs a large amount of deformation to avoid interference with the mounting part 101. Moreover, due to the existence of manufacturing process errors, it is also difficult to achieve a direct contact connection between the abutting protrusion 203 and the mounting part 101.

[0048] Preferably, the first end of the connecting post 102 is connected to the grass trimmer blade 200, and the second end of the connecting post 102 is riveted to the mounting part 101. The mounting part 101 has a mounting cavity 205 on its back side, and the second end of the connecting post 102 is hidden in the mounting cavity 205, ensuring that the second end of the connecting post 102 is not exposed, thereby reducing the impact of external factors (such as impact, corrosion, etc.) on it.

[0049] In a further preferred embodiment, a reinforcing ring 206 is provided inside the mounting cavity 205, and a reinforcing rib 207 is fixedly provided between the reinforcing ring 206 and the cavity wall of the mounting cavity 205. The second end of the connecting column 102 is located inside the reinforcing ring 206, which enhances the strength and stability of the mounting part 101, provides stable support for the connecting column 102, and further improves the durability and reliability of the entire grass trimming head.

[0050] A lawn mower, comprising the aforementioned mowing head.

[0051] It should be noted that in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly defined. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0052] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.

[0053] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0054] Output component 100; mounting part 101; connecting post 102; abutment recess 103;

[0055] Grass trimmer blade 200; guide surface 201; connecting part 202; abutting protrusion 203; connecting surface 204; mounting cavity 205; reinforcing ring 206; reinforcing rib 207; passage hole 208; mounting hole 209.

[0056] 100. Output component; 101. Mounting part; 102. Connecting post; 103. Abutment recess; 104. Guide surface;

[0057] 200. Grass trimmer blade; 202. Connecting part; 203. Abutting protrusion; 204. Connecting surface; 205. Mounting cavity; 206. Reinforcing ring; 207. Reinforcing rib; 208. Passage hole; 209. Mounting hole.

Claims

1. A type of grass trimming head, characterized in that, include: An output component (100) is provided with a mounting part (101), and a connecting post (102) is provided with the mounting part (101). A grass trimmer blade (200) is provided with a connecting part (202). The connecting part (202) includes a mounting hole (209) and a passage hole (208) that are interconnected. The diameter of the mounting hole (209) is smaller than the diameter of the passage hole (208) so that the connecting post (102) passes through the passage hole (208) and engages with the mounting hole (209) to fix the grass trimmer blade (200) onto the output component (100). The connecting part (202) also includes an abutting protrusion (203) provided on the side of the grass trimmer blade (200). When the grass trimmer blade (200) moves relative to the mounting part (101), the abutting protrusion (203) will abut against the mounting part (101) to prevent the connecting post (102) from disengaging from the mounting hole (209).

2. A grass trimming head according to claim 1, characterized in that, There are two abutting protrusions (203). The two abutting protrusions (203) are respectively located on opposite sides of the grass trimmer blade (200) and are arranged symmetrically. However, only one abutting protrusion (203) can abut and connect with the mounting part (101) at any time.

3. A grass trimming head according to claim 1, characterized in that, Along the radial direction of the output member (100), the outer surface of the mounting part (101) is an arc-shaped surface, and the center of the outer surface of the mounting part (101) is located on the central axis of the connecting column (102).

4. A grass trimming head according to claim 1 or 3, characterized in that, The mounting part (101) is connected to the outer side of the mounting part (101) in the radial direction of the output member via a guide surface (104), and the guide surface is arranged obliquely relative to the two sides of the mounting part (101).

5. A grass trimming head according to claim 1, characterized in that, The mounting part (101) has an abutment recess (103) on one side of the connecting post (102), and the abutment protrusion (203) can extend into the abutment recess (103); wherein, when the grass trimmer blade (200) moves, the abutment protrusion (203) can abut against the side of the mounting part (101); along the axial direction of the output member (100), the grass trimmer blade (200) deforms in a direction away from the abutment recess (103), so that the abutment protrusion (203) can extend into the abutment recess (103).

6. A grass trimming head according to claim 5, characterized in that, The connecting part (202) includes a connecting surface (204), the abutting protrusion (203) is disposed on the connecting surface (204), and the abutting recess (103) has a bottom wall. When the grass trimmer blade (200) is installed on the output component (100), with the connecting surface (204) as the reference surface, the straight-line distance between the end face of the abutting protrusion (203) away from the connecting surface (204) and the connecting surface (204) is greater than the straight-line distance between the bottom wall and the connecting surface (204).

7. A grass trimming head according to claim 1, characterized in that, When the grass trimmer blade (200) is installed on the output part (100), there is a gap between the abutting protrusion (203) and the side of the mounting part (101), and the length of the gap between the abutting protrusion (203) and the mounting part (101) is less than the diameter of the mounting hole (209).

8. A grass trimming head according to claim 1, characterized in that, The first end of the connecting post (102) is connected to the grass trimmer blade (200), and the second end of the connecting post (102) is riveted to the mounting part (101). The mounting part (101) has a mounting cavity (205) on its back side, and the second end of the connecting post (102) is hidden in the mounting cavity (205).

9. A grass trimming head according to claim 8, characterized in that, A reinforcing ring (206) is provided inside the mounting cavity (205), and a reinforcing rib (207) is fixedly provided between the reinforcing ring (206) and the cavity wall of the mounting cavity (205).

10. A lawn mower, characterized in that, Includes the grass trimming head as described in any one of claims 1-9.

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