Height adjustment structure of a lawnmower

Abstract

This utility model discloses a height adjustment structure for a lawnmower, including a front wheel assembly, a rear wheel assembly, and a connecting rod connecting the front wheel assembly and the rear wheel assembly. The structure is characterized by: a height adjustment bracket located on one side of the connecting rod; a height adjustment limit seat rotatably mounted on the height adjustment bracket; a height adjustment slider on the connecting rod, which is slidably mounted on the height adjustment bracket; multiple slots on the height adjustment limit seat; and a limit pin on the height adjustment slider, one of which is engaged in one of the slots. A transmission structure is provided between the front wheel assembly, the rear wheel assembly, and the connecting rod. The connecting rod is linked to the lifting and lowering of the front wheel assembly and the rear wheel assembly through this transmission structure. This utility model allows for easy multi-level height adjustment of the lawnmower by pressing a height adjustment trigger, with a simple adjustment process, stable engagement, and prevention of displacement.

Description

Technical Field

[0001] This utility model relates to the field of lawnmower technology, and in particular to a height adjustment structure for a lawnmower. Background Technology

[0002] Lawn mowers, also known as lawn trimmers or lawn mowers, are mechanical tools widely used for mowing lawns and vegetation. Through mechanized operation, they significantly save workers' working time and reduce the input of human resources. Therefore, they are widely used in garden maintenance and lawn management. However, due to the different environmental conditions of lawns, such as different terrains, grass species, or usage scenarios, the required lawn mowing height varies significantly in actual mowing processes.

[0003] The height adjustment mechanisms of existing lawnmowers are usually quite complex and not very convenient to operate. After adjustment, the height is prone to deviation, resulting in poor mowing effect. Some adjustment mechanisms may reduce reliability due to jamming or wear during long-term use, affecting the service life of the lawnmower and the user experience. Utility Model Content

[0004] The purpose of this invention is to provide a height adjustment structure for a lawnmower, which allows users to easily adjust the height of the lawnmower in multiple levels by pressing the height adjustment trigger. The adjustment process is simple, the engagement is stable, and it avoids deviation.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a height adjustment structure for a lawnmower, comprising a front wheel assembly, a rear wheel assembly, and a connecting rod connecting the front wheel assembly and the rear wheel assembly, characterized in that: it further comprises a height adjustment bracket disposed on one side of the connecting rod, a height adjustment limit seat rotatably mounted on the height adjustment bracket, a height adjustment slider disposed on the connecting rod, and the height adjustment slider slidably mounted on the height adjustment bracket; the height adjustment limit seat is provided with multiple slots, and the height adjustment slider is provided with a limit pin, one of which is selectively engaged in the slot; a transmission structure is provided between the front wheel assembly, the rear wheel assembly, and the connecting rod, and the connecting rod is linked with the lifting and lowering of the front wheel assembly and the rear wheel assembly through the transmission structure.

[0006] By adopting the above technical solution, the connecting rod moves back and forth through the cooperation of the limiting pin and different slots, allowing the lawnmower to be adjusted between multiple preset heights. The limiting pin is initially engaged in the slot at the rear end. When the connecting rod moves backward, the front wheel assembly and the rear wheel assembly move downward, raising the height of the lawnmower. When the connecting rod moves forward, the front wheel assembly and the rear wheel assembly move upward, lowering the height of the lawnmower. The adjustment structure is stable and reliable, preventing height deviation during mowing.

[0007] The present invention is further configured such that: the end of the height adjustment limit seat near the height adjustment slider is the locking end, the end away from the height adjustment slider is the unlocking end, the slot is disposed on the locking end, and the height adjustment trigger is abutted on the unlocking end.

[0008] By adopting the above technical solution, the height adjustment trigger can be pressed when unlocking is required, causing the height adjustment limit seat to rotate and releasing the limit pin. The user can then apply external force to the lawnmower's casing to drive the height adjustment slider to move relative to the height adjustment limit seat, thereby easily adjusting the height, simplifying the operation process, and improving ease of use.

[0009] The present invention is further configured such that: a rotating shaft is provided on the height adjustment bracket, and the height adjustment limit seat is rotatably mounted on the height adjustment bracket via the rotating shaft; a torsion spring is sleeved on the rotating shaft, and the torsion spring causes the locking end of the height adjustment limit seat to always have a tendency to rotate toward the height adjustment slider.

[0010] By adopting the above technical solution, the torsion spring provides elastic restoring force, so that the height adjustment limit seat automatically returns to the locked position after the trigger is released, avoiding loosening after adjustment and improving the reliability of the height adjustment structure.

[0011] The present invention is further configured such that: the height adjustment bracket is provided with a guide groove, the height adjustment slider is provided with a guide protrusion, and the guide protrusion is slidably disposed in the guide groove.

[0012] By adopting the above technical solution, the cooperation between the guide groove and the guide protrusion ensures that the height adjustment slider moves along a path parallel to the connecting rod, preventing skewing or jamming during the adjustment process and improving the stability of the height adjustment structure.

[0013] The present invention is further configured such that: a tension spring is connected to the height adjustment bracket, and the end of the tension spring away from the height adjustment bracket is connected to the connecting rod.

[0014] By adopting the above technical solution, the tension spring can drive the limit pin back into the initial slot when the user releases his hand, causing the connecting rod to move backward and return to its original position, and causing the front wheel assembly and rear wheel assembly to move downward, thereby improving the reset performance of the adjustment mechanism.

[0015] The present invention is further configured such that: the height adjustment slider is provided with a limiting groove, and the middle part of the connecting rod is provided with a horizontal pin, the horizontal pin being inserted into the limiting groove.

[0016] By adopting the above technical solution, the cooperation between the limiting groove and the horizontal pin allows for a certain amount of movement between the height adjustment slider and the connecting rod, making the adjustment process smoother, avoiding jamming, and improving the durability of the height adjustment structure.

[0017] The present invention is further configured such that: the transmission structure includes a front movable plate rotatably disposed at the front end of the connecting rod and a rear movable plate rotatably disposed at the rear end of the connecting rod.

[0018] By adopting the above technical solution, the front movable plate and the rear movable plate can drive the front wheel and the rear wheel to rise and fall synchronously, so that the overall height of the lawnmower is consistent and the uneven mowing caused by the asynchronous movement of the front and rear wheels is avoided.

[0019] The present invention is further configured such that: the front wheel assembly includes a front wheel axle and a front wheel body, the front wheel body is rotatably disposed on the front movable plate and connected to one end of the front movable plate away from the connecting rod, and the front wheel axle is fixedly connected to the front movable plate; the rear wheel assembly includes a rear wheel axle and a rear wheel body, the rear wheel body is rotatably disposed on the rear movable plate and connected to one end of the rear movable plate away from the connecting rod, and the rear wheel axle is fixedly connected to the rear movable plate.

[0020] By adopting the above technical solution, when the connecting rod moves back and forth, it can drive the front movable plate and the rear movable plate to rotate synchronously, so that the front wheel body and the rear wheel body can be adjusted as a whole. The structure is simple, the transmission is reliable, and the adjustment process is labor-saving and efficient.

[0021] The present invention is further configured such that: a limiting protrusion is provided on the unlocking end, and the limiting protrusion cooperates with the height adjustment trigger limiting.

[0022] By adopting the above technical solution, when the user presses the height adjustment trigger, the height adjustment trigger can drive the unlocking end to rotate, preventing the height adjustment trigger from disengaging from the unlocking end, thereby ensuring that the unlocking action is stable and reliable.

[0023] The present invention is further configured such that the connecting rod is provided with a scale for indicating the current adjustment height.

[0024] By adopting the above technical solution, users can intuitively judge the current lawn mowing height setting through the scale, avoiding repeated adjustments and improving the convenience of the adjustment process.

[0025] In summary, this utility model has the following beneficial effects: 1. Users can easily adjust the height of the lawnmower in multiple levels by pressing the height adjustment trigger. The adjustment process is simple, the engagement is stable, and it avoids deviation.

[0026] 2. Adjust the slider to move along a fixed path to prevent skewing or jamming.

[0027] 3. With the combined action of the tension spring and the second torsion spring, the connecting rod and the front wheel assembly can be automatically reset after the height adjustment trigger is released, and the front wheel is always in close contact with the ground to avoid being suspended in the air, thereby improving the stability and adaptability of the lawnmower in complex terrain. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of this utility model.

[0029] Figure 2 yes Figure 1 A magnified view of A in the middle.

[0030] Figure 3 This is an exploded view of this utility model.

[0031] Figure 4 This is a cross-sectional view of the height adjustment bracket and height adjustment slider of this utility model.

[0032] Figure 5 This is a schematic diagram of the height adjustment limit seat of this utility model.

[0033] Figure 6 This is a cross-sectional view of the height adjustment limit seat of this utility model in its rotational state.

[0034] Figure 7 This is a structural diagram of the lawnmower.

[0035] In the diagram: 1. Front wheel assembly; 11. Front movable plate; 12. Front wheel axle; 13. Front wheel body; 14. Second torsion spring; 2. Rear wheel assembly; 21. Rear movable plate; 22. Rear wheel axle; 23. Rear wheel body; 3. Connecting rod; 31. Height adjustment slider; 311. Limiting pin; 312. Guide protrusion; 313. Limiting groove; 32. Tension spring; 33. Horizontal pin; 34. Scale; 4. Height adjustment bracket; 41. Height adjustment limit seat; 42. Locking end; 43. Unlocking end; 431. Limiting protrusion; 44. Slot; 45. Rotating shaft; 46. Torsion spring; 47. Guide slide groove; 5. Height adjustment trigger. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings.

[0037] like Figures 1 to 7As shown, the present invention provides a height adjustment structure for a lawnmower, including a front wheel assembly 1, a rear wheel assembly 2, and a connecting rod 3 connecting the front wheel assembly 1 and the rear wheel assembly 2. A height adjustment bracket 4 is provided on one side of the connecting rod 3. A height adjustment limit seat 41 is provided on the height adjustment bracket 4, and the height adjustment limit seat 41 is rotatably mounted on the height adjustment bracket 4 via a rotating shaft 45. A height adjustment slider 31 is fixedly provided on the connecting rod 3 and slidably mounted on the height adjustment bracket 4. The height adjustment limit seat 41 is provided with multiple slots 44. The setting direction of 4 is arranged along the axis of the rotating shaft 45. The height adjustment slider 31 is provided with a limiting shaft pin 311. The limiting shaft pin 311 can be selectively engaged in the slot 44. A transmission structure is provided between the front wheel assembly 1, the rear wheel assembly 2 and the connecting rod 3. The connecting rod 3 is linked with the lifting of the front wheel assembly 1 and the rear wheel assembly 2 through the transmission structure. Through the cooperation of the limiting shaft pin 311 with different slots 44, the height adjustment slider 31 drives the connecting rod 3 to move in the front and back direction, thereby realizing the adjustment of the lawnmower between multiple preset heights. When the limiting pin 311 is initially engaged in the slot 44 at the rear end, the connecting rod 3 is in its initial position. When the connecting rod 3 moves backward, the front wheel assembly 1 and the rear wheel assembly 2 move downward through the transmission structure, raising the overall height of the lawnmower. When the connecting rod 3 moves forward, the front wheel assembly 1 and the rear wheel assembly 2 move upward through the transmission structure, lowering the overall height of the lawnmower. This adjustment structure ensures the stability of the height adjustment through the engagement of the limiting pin 311 and the slot 44, preventing height deviation during mowing.

[0038] like Figures 3 to 6As shown, the end of the height adjustment limit seat 41 near the height adjustment slider 31 is the locking end 42, and the end away from the height adjustment slider 31 is the unlocking end 43. The locking end 42 and the unlocking end 43 are located on both sides of the rotating shaft 45, respectively. The slot 44 is provided on the locking end 42, and the height adjustment trigger 5 abuts on the unlocking end 43. The unlocking end 43 is provided with a limit protrusion 431, and the lower end of the height adjustment trigger 5 is open, forming a limit engagement with the limit protrusion 431. The height adjustment trigger 5 can be pressed when the height needs to be adjusted, causing the height adjustment limit seat 41 to rotate around the rotating shaft 45, releasing the limit pin 311. The limit protrusion 431 ensures that the height adjustment trigger 5 will not disengage from the unlocking end 43. The user can apply external force to the lawnmower casing to drive the height adjustment slider 31 to slide relative to the height adjustment limit seat 41, thereby achieving convenient height adjustment, simplifying the operation process, and improving efficiency. For high ease of use, a torsion spring 46 is fitted on the rotating shaft 45. The torsion spring 46 ensures that the locking end 42 of the height adjustment limit seat 41 always tends to rotate towards the height adjustment slider 31. When the user releases the height adjustment trigger 5, the torsion spring 46 provides elastic restoring force, causing the height adjustment limit seat 41 to automatically return to the locked position, ensuring stable engagement between the limit pin 311 and the slot 44, preventing loosening after adjustment, and improving the reliability of the height adjustment structure. The height adjustment bracket 4 is provided with a guide groove 47, and the height adjustment slider 31 is provided with a guide protrusion 312. The guide protrusion 312 is slidably disposed in the guide groove 47, which is parallel to the connecting rod 3. The cooperation between the guide groove 47 and the guide protrusion 312 restricts the movement path of the height adjustment slider 31, causing it to slide in a direction parallel to the connecting rod 3, preventing skewing or jamming during adjustment, thereby improving the stability of the height adjustment structure.

[0039] like Figure 1 and Figure 2 As shown, a tension spring 32 is connected to the height adjustment bracket 4. The end of the tension spring 32 away from the height adjustment bracket 4 is connected to the connecting rod 3. The tension spring 32 provides tension after the user releases his hand, which drives the limit pin 311 back into the initial slot 44, causing the connecting rod 3 to move backward to its original position. At the same time, the transmission structure causes the front wheel assembly 1 and the rear wheel assembly 2 to move downward, improving the reset performance of the adjustment mechanism.

[0040] like Figure 2 As shown, the height adjustment slider 31 is provided with a limiting groove 313, and the middle part of the connecting rod 3 is provided with a horizontal pin 33. The horizontal pin 33 is inserted into the limiting groove 313. The cooperation between the limiting groove 313 and the horizontal pin 33 provides appropriate movement space between the height adjustment slider 31 and the connecting rod 3, making the adjustment process more stable, avoiding jamming, and thus improving the durability of the height adjustment structure.

[0041] like Figure 2As shown, the transmission structure includes a front movable plate 11 rotatably disposed at the front end of the connecting rod 3 and a rear movable plate 21 rotatably disposed at the rear end of the connecting rod 3. The front movable plate 11 and the rear movable plate 21 are respectively connected to the front wheel assembly 1 and the rear wheel assembly 2, and can drive the front wheel assembly 1 and the rear wheel assembly 2 to rise and fall synchronously when the connecting rod 3 moves back and forth, ensuring that the overall height adjustment of the lawnmower is consistent and avoiding uneven mowing caused by asynchronous height of the front and rear wheels. The front wheel assembly 1 includes a front wheel axle 12 and a front wheel body 13. The front wheel body 13 is rotatably disposed on the front movable plate 11, and one end of the front wheel body 13 connected to the front movable plate 11 is far from the front wheel axle 12. One end of the front movable plate 11 connected to the connecting rod 3 is fixedly connected to the front movable plate 11. The rear wheel assembly 2 includes a rear wheel axle 22 and a rear wheel body 23. The rear wheel body 23 is rotatably mounted on the rear movable plate 21. One end of the rear wheel body 23 connected to the rear movable plate 21 is away from the end of the connecting rod 3 connected to the rear movable plate 21. The rear wheel axle 22 is fixedly connected to the rear movable plate 21. When the connecting rod 3 moves back and forth, the front movable plate 11 and the rear movable plate 21 rotate synchronously, driving the front wheel body 13 and the rear wheel body 23 to achieve overall height adjustment. The structure is simple, the transmission is reliable, and the adjustment process is labor-saving and efficient.

[0042] like Figure 7 As shown, the connecting rod 3 is provided with a scale 34 for indicating the current adjustment height. Part of the scale 34 is exposed outside the housing, and the other part is hidden inside the housing. An indicator arrow is provided on the housing, pointing to the scale 34 closest to the housing. The scale 34 intuitively displays the current height setting. As the height is adjusted, the connecting rod 3 moves back and forth, causing the indicator arrow to point to different scales 34, which makes it easy for users to quickly judge the adjustment status of the lawnmower, avoid repeated adjustments, and improve the convenience of operation.

[0043] The basic working principle of this utility model is as follows: When it is necessary to lower the height of the lawnmower, the user presses down on the height adjustment trigger 5, causing the unlocking end 43 of the height adjustment limit seat 41 to move downward, overcoming the torque of the torsion spring 46, and causing it to rotate around the rotating shaft 45. The locking end 42 of the height adjustment limit seat 41 then lifts up and moves away from the height adjustment slider 31, disengaging its groove 44 from the limit pin 311 on the height adjustment slider 31, thus releasing the lock on the connecting rod 3. At this time, the user can directly apply a downward force to the lawnmower housing. The applied force will cause the front wheel assembly 1 and the rear wheel assembly 2 to move upward relative to the housing. The movement of the front wheel assembly 1 and the rear wheel assembly 2 will be transmitted to the connecting rod 3 through the front movable plate 11 and the rear movable plate 21. The moving connecting rod 3 moves forward, causing the height adjustment slider 31 to move forward relative to the height adjustment limit seat 41. When the desired height is reached, the user releases the height adjustment trigger 5, and the torsion spring 46 drives the height adjustment limit seat 41 to reset, so that the limit pin 311 is engaged in the front slot 44. When it is necessary to raise the height of the lawnmower, press the height adjustment trigger 5 down without applying force to the machine housing. Under the reset force of the tension spring 32, the connecting rod 3 automatically moves backward to return to its original position, so that the limit pin 311 returns to the rear slot 44, thereby driving the front wheel assembly 1 and the rear wheel assembly 2 to move downward relative to the machine housing, so that the lawnmower is raised. Throughout the process, the user can intuitively judge the current lawnmower height setting by observing the scale 34 set on the connecting rod 3.

[0044] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A height adjustment structure for a lawnmower, comprising a front wheel assembly (1), a rear wheel assembly (2), and a connecting rod (3) connecting the front wheel assembly (1) and the rear wheel assembly (2), characterized in that: It also includes a height adjustment bracket (4) located on one side of the connecting rod (3), a height adjustment limit seat (41) is rotatably mounted on the height adjustment bracket (4), and a height adjustment slider (31) is provided on the connecting rod (3), and the height adjustment slider (31) is slidably mounted on the height adjustment bracket (4); The height adjustment limit seat (41) is provided with multiple slots (44), and the height adjustment slider (31) is provided with a limit pin (311). One of the limit pins (311) is selected to be engaged in the slot (44). A transmission structure is provided between the front wheel assembly (1), the rear wheel assembly (2) and the connecting rod (3), and the connecting rod (3) is linked with the lifting and lowering of the front wheel assembly (1) and the rear wheel assembly (2) through the transmission structure.

2. The height adjustment structure for a lawnmower according to claim 1, characterized in that: The end of the height adjustment limit seat (41) near the height adjustment slider (31) is the locking end (42), and the end away from the height adjustment slider (31) is the unlocking end (43). The slot (44) is provided on the locking end (42), and the height adjustment trigger (5) is abutted on the unlocking end (43).

3. The height adjustment structure for a lawnmower according to claim 1, characterized in that: The height adjustment bracket (4) is provided with a rotating shaft (45), and the height adjustment limit seat (41) is rotatably mounted on the height adjustment bracket (4) via the rotating shaft (45). A torsion spring (46) is sleeved on the rotating shaft (45), and the torsion spring (46) causes the locking end (42) of the height adjustment limit seat (41) to always have a tendency to rotate toward the height adjustment slider (31).

4. The height adjustment structure for a lawnmower according to claim 1, characterized in that: The height adjustment bracket (4) is provided with a guide groove (47), and the height adjustment slider (31) is provided with a guide protrusion (312). The guide protrusion (312) is slidably disposed in the guide groove (47).

5. The height adjustment structure for a lawnmower according to claim 1, characterized in that: A tension spring (32) is connected to the height adjustment bracket (4), and the end of the tension spring (32) away from the height adjustment bracket (4) is connected to the connecting rod (3).

6. The height adjustment structure for a lawnmower according to claim 2, characterized in that: The height adjustment slider (31) is provided with a limiting groove (313), and the middle part of the connecting rod (3) is provided with a horizontal pin (33), which is inserted into the limiting groove (313).

7. The height adjustment structure for a lawnmower according to claim 1, characterized in that: The transmission structure includes a front movable plate (11) rotatably disposed at the front end of the connecting rod (3) and a rear movable plate (21) rotatably disposed at the rear end of the connecting rod (3).

8. The height adjustment structure for a lawnmower according to claim 7, characterized in that: The front wheel assembly (1) includes a front wheel axle (12) and a front wheel body (13). The front wheel body (13) is rotatably mounted on the front movable plate (11) and connected to one end of the front movable plate (11) away from the connecting rod (3). The front wheel axle (12) is fixedly connected to the front movable plate (11). The rear wheel assembly (2) includes a rear wheel axle (22) and a rear wheel body (23). The rear wheel body (23) is rotatably mounted on the rear movable plate (21) and connected to one end of the rear movable plate (21) away from the connecting rod (3). The rear wheel axle (22) is fixedly connected to the rear movable plate (21).

9. The height adjustment structure for a lawnmower according to claim 2, characterized in that: The unlocking end (43) is provided with a limiting protrusion (431), which cooperates with the height adjustment trigger (5) for limiting.

10. The height adjustment structure for a lawnmower according to claim 1, characterized in that: The connecting rod (3) is provided with a scale (34) for indicating the current adjustment height.

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