Lawn aerator

Abstract

This application discloses a lawn mower, belonging to the field of lawn mower technology. The lawn mower includes a front housing, a drive unit, and a mowing head. The drive unit is configured to drive the mowing head to rotate around a first axis. The mowing head includes a head shell assembly and a spool that cooperates with the head shell assembly. The spool is used to wind mowing rope. The lawn mower also includes a limiting assembly, which includes a first limiting member, a second limiting member, and a movable member. The first limiting member is fixed relative to the front housing in a circumferential direction around the first axis. The second limiting member rotates synchronously with the head shell assembly or the spool in a circumferential direction around the first axis. The movable member has a first position and a second position. When the movable member is in the first position, it allows relative rotation between the second and first limiting members, and the lawn mower is in mowing mode. When the movable member is in the second position, the first limiting member, through the movable member, prevents the movement of the second limiting member, and the lawn mower is in winding mode. This application improves winding efficiency.

Description

Technical Field

[0001] This application relates to the field of lawn mower technology, and more particularly to a lawn mower. Background Technology

[0002] A lawn mower includes a mowing head, which comprises a spool and a head housing to accommodate the spool. In related technologies, when the lawn mower needs to wind the mop, the spool usually needs to be removed from the head housing for winding, which reduces work efficiency. In other related technologies, when the lawn mower needs to wind the mop, the user needs to first thread the mopping rope through the mowing head, and then the user needs at least one hand to hold the head housing and the other hand to hold the winding part connected to the spool to rotate the spool relative to the head housing. This makes it easy for the mopping rope to get tangled in the user's arm, get their hands dirty, is inconvenient to operate, and has low work efficiency. Summary of the Invention

[0003] The purpose of this application is to provide a lawn mower that is easy to operate and improves work efficiency.

[0004] To achieve this objective, the following technical solution is adopted in this application:

[0005] A lawn mower is provided, comprising: a front housing, a drive unit, and a mowing head. The drive unit is configured to drive the mowing head to rotate about a first axis. The mowing head includes: a head shell assembly and a spool cooperating with the head shell assembly, the spool being used to wind mowing rope. The lawn mower further includes: a limiting assembly, the limiting assembly comprising:

[0006] The first limiting member is fixed relative to the front end housing in a circumferential direction around the first axis;

[0007] The second limiting member rotates synchronously with the head shell assembly or the spool in a circumferential direction around the first axis.

[0008] The movable part has a first position and a second position.

[0009] When the movable part is in the first position, the movable part allows the second limiting part and the first limiting part to rotate relative to each other, and the lawn mower is in the lawn mowing mode;

[0010] When the movable part is in the second position, the first limiting part prevents the movement of the second limiting part through the movable part, and the lawn mower is in the winding mode.

[0011] In some possible implementations, the first limiting member is a ratchet seat, which has a one-way limiting part. When the trimmer head rotates in the first direction, the movable member moves to the first position and disengages from the one-way limiting part; when the trimmer head rotates in the second direction, the movable member can move to the second position and abut against the one-way limiting part, wherein the first direction and the second direction are opposite directions.

[0012] In some possible implementations, the second limiting member is provided with a guide groove, along which the movable member can move.

[0013] In some possible implementations, the first limiting member is detachably connected to the front end housing, and / or the second limiting member is detachably connected to the trimmer head.

[0014] In some possible implementations, the movable element moves from the second position to the first position under the action of centrifugal force.

[0015] In some possible implementations, the movable element is movably connected to the second limiting element.

[0016] In some possible implementations, the limiting component further includes a reset element capable of driving the movable element to reset to the second position.

[0017] In some possible implementations, the reset element is a magnet, which is mounted on the front housing or the trimmer head, and the magnet is magnetically connected to the movable part.

[0018] In some possible implementations, the outer periphery of the first limiting member is provided with limiting teeth, the movable member is an eccentric block, the eccentric block is provided with mating teeth that cooperate with the limiting teeth, and the second limiting member is used to restrict the rotation of the eccentric block relative to the second limiting member and allow the eccentric block to move in a straight line relative to the second limiting member, so that the mating teeth abut or disengage from the limiting teeth.

[0019] In some possible implementations, a counterweight is connected to the eccentric block, causing the eccentric block to undergo centrifugal motion as the hay-beating head rotates.

[0020] In some possible implementations, the outer periphery of the first limiting member is provided with limiting teeth, the movable member is a rotating block, and the movable member is rotatably connected to the second limiting member so that the rotating block engages or disengages from the limiting teeth.

[0021] In some possible implementations, the outer peripheral surface of the first limiting member includes an inclined surface, the movable member is a pin, the sidewall of the second limiting member surrounds the outer periphery of the first limiting member, a limiting groove is formed between the inclined surface and the sidewall, and the pin moves relative to the first limiting member to a position that abuts against or disengages from the inclined surface.

[0022] The beneficial effects of this application are:

[0023] This application provides a grass trimmer that, by setting a limiting component, allows the grass trimmer to be in either a grass trimming mode or a winding mode. In the winding mode, the first limiting component prevents the movement of the second limiting component through a movable component. The driving device drives the grass trimming head to move relative to the head shell assembly, automatically winding the grass trimming rope onto the spool. This facilitates operation, improves winding efficiency, and thus improves work efficiency. Attached Figure Description

[0024] Figure 1 This is a structural schematic diagram of the lawn mower provided in Embodiment 1;

[0025] Figure 2 This is a schematic diagram of the grass trimmer and front end housing provided in Embodiment 1;

[0026] Figure 3 yes Figure 2 A diagram showing the crank handle in the raised position;

[0027] Figure 4 yes Figure 2 A longitudinal sectional view;

[0028] Figure 5 yes Figure 2 A longitudinal sectional view without the front end housing;

[0029] Figure 6 yes Figure 2 Exploded view of the front casing from one perspective;

[0030] Figure 7 yes Figure 2 Exploded view from another perspective without the front casing;

[0031] Figure 8 This is a cross-sectional view of the movable component provided in Embodiment 1 at the first position;

[0032] Figure 9 This is a cross-sectional view of the movable part provided in Embodiment 1 in the second position;

[0033] Figure 10 This is a schematic diagram of the movable component in the second position provided in Embodiment 1;

[0034] Figure 11This is a schematic diagram of the movable component in the first position provided in Embodiment 1;

[0035] Figure 12 This is a schematic diagram of the assembly of the first limiting member and the head shell assembly provided in Embodiment 1;

[0036] Figure 13 This is a cross-sectional view of the movable part in the second position provided in Embodiment 2;

[0037] Figure 14 This is a cross-sectional view of the movable component in the first position provided in Embodiment 2;

[0038] Figure 15 This is a cross-sectional view of the movable component in the first position provided in Embodiment 3;

[0039] Figure 16 This is a cross-sectional view of the movable part in the second position provided in Embodiment 3;

[0040] Figure 17 This is an exploded view of the movable part and the second limiting part provided in Embodiment 3.

[0041] In the picture:

[0042] 1. Front shell; 2. Trimming head; 21. Head shell assembly; 211. Upper shell; 212. Lower shell; 213. Support component; 22. Spool; 23. Cover plate;

[0043] 3. Limiting components;

[0044] 31. First limiting component; 311. Limiting tooth; 312. Inclined surface; 313. Protruding tooth;

[0045] 32. Second limiting component; 321. Straight groove; 322. Arc groove; 323. Circular groove;

[0046] 33. Moving part; 331. Eccentric block; 3311. Mating tooth; 3312. Circular protrusion; 332. Counterweight; 333. Rotating block; 334. Pin;

[0047] 34. Reset element; 341. Magnet;

[0048] 4. Crank handle; 5. Drive unit; 51. Mounting bracket; 7. Elastic element; 8. Linkage assembly; 9. Battery pack; 10. Straw rope; 11. Operating device;

[0049] 100, lawn mower; X, first axis. Detailed Implementation

[0050] To make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this application will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0051] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0052] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0053] This embodiment provides a lawn mower 100, such as Figures 1-12 As shown, the lawn mower 100 includes a front housing 1, a drive device 5, and a mowing head 2. The drive device 5 is configured to drive the mowing head 2 to rotate around a first axis X. The mowing head 2 includes a head shell assembly 21 and a spool 22 that cooperates with the head shell assembly 21. The spool 22 is used to wind mowing rope 10. The lawn mower 100 also includes a limiting assembly 3, which includes a first limiting member 31, a second limiting member 32, and a movable member 33. The first limiting member 31 is fixed relative to the front housing 1 in a circumferential direction around the first axis X. The second limiting member 32 rotates synchronously with the head shell assembly 21 or the spool 22 in a circumferential direction around the first axis X. The movable member 33 has a first position and a second position.

[0054] By changing the position of the movable part 33 in the limiting component 3, when the movable part 33 is in the first position, it allows the second limiting part 32 and the first limiting part 31 to rotate relative to each other. The driving device 5 drives the spool 22 and the head shell assembly 21 to rotate simultaneously, causing the mowing rope 10 on the spool 22 to rotate, and the mower 100 is in mowing mode. When the movable part 33 is in the second position, the first limiting part 31 prevents the movement of the second limiting part 32 through the movable part 33. The driving device 5 drives one of the spool 22 and the head shell assembly 21 to rotate, while the other is fixed relative to the front shell 1. The mowing rope 10 can be wound around the spool 22, and the mower 100 is in winding mode. By setting the limiting component 3, the driving device 5 can drive the mowing head 2 to automatically wind the mowing rope 10 around the spool 22, which facilitates operation, improves winding efficiency, and thus improves work efficiency.

[0055] The axial movement of the first limiting member 31 and the second limiting member 32 has little or no effect on the rotation of the spool 22 and the head shell assembly 21 around the first axis X. In this embodiment, the first limiting member 31 can be fixed or non-fixed relative to the front end shell 1 along the axial direction, which is not limited. The second limiting member 32 can be fixed or non-fixed relative to the head shell assembly 21 or the spool 22 along the axial direction, which is also not limited.

[0056] In one embodiment, the movable part 33 is movably connected to the second limiting part 32. By respectively setting a first limiting part 31 on the front end housing 1, a second limiting part 32 on the head housing assembly 21 or the spool 22, and a movable part 33 movably set on the first limiting part 31 and the second limiting part 32, the number of parts is small, the fit is simple, assembly is convenient, the solution is relatively easy to implement, the manufacturing cost is low, and they can be disassembled and replaced separately, extending the service life of the trimmer head 2. When a part is damaged, it can be replaced individually, reducing costs. In one embodiment, the first limiting part 31 can be detachably connected to the front end housing 1 by fasteners, and similarly, the second limiting part 32 can also be detachably connected to the trimmer head 2 by fasteners.

[0057] In one implementation, such as Figures 1-3 As shown, the mower 100 also includes a crank handle 4. In the winding mode, the crank handle 4 can be lifted and rotated to wind the cord. In the mowing mode, the crank handle 4 is lowered to avoid accidental operation. The specific connection method and structure are as described in the prior art. The mower 100 also includes an operating device 11 and a connecting rod assembly 8. The connecting rod assembly 8 is located above the mowing head 2. The operating device 11 is connected to the connecting rod assembly 8. The operating device 11 can be held during mowing, and operation buttons can also be provided on the operating device 11, as described in the prior art. Furthermore, a battery pack 9 is installed on the operating device 11. The battery pack 9 is used to power the operating device 11 and the drive device 5 in the mower 100.

[0058] like Figure 4 and Figure 5 As shown, further, when the motor is located at the front end of the linkage assembly 8, the drive device 5 can be understood as the motor. When the motor is located at the rear end of the linkage assembly 8, the drive device 5 can be understood as the gear set located in the front end housing 1 that connects the motor and the trimmer head 2. The output shaft of the drive device 5 can be connected to either the bobbin 22 or the head housing assembly 21, which can directly drive the other to rotate around the first axis X. In one embodiment, the drive device 5 also includes a mounting bracket 51 for mounting structures such as the front end housing 1.

[0059] In some embodiments, the spool 22 is housed within the head shell assembly 21. The spool 22 has an inner threading hole for securing the straw rope 10 or for the straw rope 10 to pass through. The head shell assembly 21 has an outer threading hole for the straw rope 10 to pass through. As one implementation, the head shell assembly 21 includes an upper shell 211 and a lower shell 212, which facilitates assembly of the head shell assembly 21 with the spool 22 and allows the user to easily open the head shell assembly 21 to inspect its interior. In some embodiments, a support member 213 is connected to the side of the upper shell 211 facing away from the lower shell 212. The support member 213 may have blades or the like to generate airflow for cooling.

[0060] In one embodiment, the grass trimmer 2 further includes an elastic element 7 disposed between the head shell assembly 21 and the spool 22 for applying force. The elastic element 7 may be a spring, with both ends of the spring abutting between the lower housing 212 and the spool 22. The spring applies a force that moves the spool 22 away from the lower housing 212.

[0061] In one embodiment, when the user needs to replenish the new straw rope 10, the user can align the inner thread hole and the outer thread hole, and then the straw rope 10 passes through the outer thread hole and then enters the inner thread hole. At this time, as long as the spool 22 and the head shell assembly 21 can move relative to each other, the limiting effect of the outer thread hole on the straw rope 10 will cause the straw rope 10 to gradually wrap around the spool 22 as the outer thread hole moves relative to the spool 22.

[0062] For ease of description, this embodiment uses the example of the second limiting member 32 and the head shell assembly 21 rotating synchronously in the circumferential direction around the first axis X as an example. The first limiting member 31 prevents the second limiting member 32 from moving through the movable member 33, thereby preventing the head shell assembly 21 from moving. When the driving device 5 drives the grass trimming head 2 to rotate around the first axis X, only the spool 22 rotates around the first axis X, thus achieving the winding of the grass trimming rope 10 onto the spool 22. In this embodiment, the second limiting member 32 and the support member 213 are integrally formed, and the second limiting member 32 is formed by the support member 213, or it can be understood that the support member 213 includes the second limiting member 32. In other embodiments, the second limiting member 32 can also be connected to the support member 213 by fasteners. In some embodiments, the support member 213 has a cover plate 23 on the side opposite to the lower housing 212, and the movable member 33 is disposed between the cover plate 23 and the second limiting member 32 to achieve axial limiting.

[0063] In one embodiment, the first limiting member 31 is a ratchet seat with a one-way limiting part. When the trimmer head 2 rotates in the first direction, the movable member 33 moves to the first position and disengages from the one-way limiting part, thereby unlocking the second limiting member 32. This unlocks the head shell assembly 21 from the front end shell 1, allowing the head shell assembly 21 and the spool 22 to rotate simultaneously. When the spool 22 rotates in the second direction, the movable member 33 moves to the second position and abuts against the one-way limiting part, locking the second limiting member 32. This locks the head shell assembly 21 from the front end shell 1, preventing the head shell assembly 21 from moving. The first and second directions are opposite. By setting a one-way limiting part on the ratchet seat to unidirectionally limit the movable member 33, the head shell assembly 21 is unidirectionally limited. When the trimmer head 2 is driven to rotate in the first direction, the trimming mode is activated; when the spool 22 is driven to rotate in the second direction, the winding mode is activated. In this embodiment, the ratchet seat is bolted to the front end shell 1.

[0064] In one embodiment, the second limiting member 32 is provided with a guide groove, and the movable member 33 can move along the guide groove, which improves the motion accuracy, ensures the reliability of the relative rotation between the first limiting member 31 and the second limiting member 32, and the reliability of the first limiting member 31 preventing the second limiting member 32 from moving through the movable member 33.

[0065] During the rotation of the grass-trimming head 2 in the first direction, the movable part 33 moves with the grass-trimming head 2 and is subjected to centrifugal force. In one embodiment, the movable part 33 moves from the second position to the first position under the action of centrifugal force. When it moves from the second position to the first position, no additional force needs to be applied to the movable part 33, making it convenient to use.

[0066] In one embodiment, the limiting component 3 further includes a reset element 34, which can drive the movable member 33 to reset to the second position. No additional force is required when moving from the first position to the second position, making it convenient to use. In another embodiment, the reset element 34 is a magnet 341, which is mounted on the front housing 1 or the trimmer head 2 and is attracted to the movable member 33. When the trimmer head 2 rotates in the first direction, the centrifugal force is greater than the attraction force, causing the movable member 33 to move centrifugally from the second position to the first position. When it stops rotating in the first direction, the movable member 33 is attracted by the magnet 341 and moves from the first position to the second position. In another embodiment, the reset element 34 is a spring, one end of which is connected to the front housing 1 or the grass trimmer 2, and the other end is connected to the movable part 33. The movable part 33 is elastically connected to the spring. When the grass trimmer 2 rotates in the first direction, the centrifugal force is greater than the elastic force, and the movable part 33 moves centrifugally from the second position to the first position. When it stops rotating in the first direction, the movable part 33 is subjected to the elastic force and moves from the first position to the second position.

[0067] In one embodiment, the outer periphery of the first limiting member 31 is provided with limiting teeth 311. Specifically, the first limiting member 31 is a ratchet seat, and the one-way limiting part of the ratchet seat is the limiting teeth 311 on the outer periphery of the ratchet seat. The movable member 33 is an eccentric block 331, and the eccentric block 331 is provided with mating teeth 3311 that cooperate with the limiting teeth 311. The second limiting member 32 is used to restrict the rotation of the eccentric block 331 relative to the second limiting member 32 and allow the eccentric block 331 to move linearly relative to the second limiting member 32, so that the mating teeth 3311 abut or disengage from the limiting teeth 311. Specifically, the guide groove on the second limiting member 32 is a straight groove 321, and the movable member 33 moves along the straight groove 321. Figure 8 and Figure 11 As shown, the movable part 33 is in the first position, and the limiting tooth 311 and the mating tooth 3311 are disengaged, as... Figure 9 and Figure 10 As shown, the movable part 33 is in the second position; in this embodiment, the eccentric block 331 includes a frame, the frame is provided with mating teeth 3311 inside, a ratchet seat is provided inside the frame, the frame is located inside the straight groove 321, and the outside of the frame slides along the straight groove 321; further, the outer periphery of the frame is provided with a circular protrusion 3312 that slides with the groove wall of the straight groove 321 to reduce the force-bearing area and facilitate sliding between the first and second positions; the frame can be slidably connected to the left and right side walls or bottom wall of the straight groove 321 to restrict the movable part 33 from moving in a straight line, without limitation. In some embodiments, the straight groove 321 is in Figure 8 and Figure 9 The left and right sidewalls or one sidewall are slidably connected to the frame, and the straight groove 321 is in Figure 8 and Figure 9The upper and lower sidewalls of the device have a limiting function. When the eccentric block 331 abuts against the upper sidewall, it is in the first position, and when the eccentric block 331 abuts against the lower sidewall, it is in the second position. The specific shapes of the limiting teeth 311 and the mating teeth 3311 can be set with reference to the ratchet mechanism in the prior art, and will not be described in detail here.

[0068] In other embodiments, the movable part 33 may also be in the shape of a straight track, with a mating tooth 3311 on one side and a sliding connection with a straight groove 321 on the other side.

[0069] In one embodiment, the limiting component 3 further includes a counterweight 332. The center of gravity of the eccentric block 331 is offset from the first axis X, so that the counterweight 332 can balance the imbalance of the eccentric block 331 and reduce the vibration generated by the trimmer head 2 during rotation. The center of gravity of the eccentric block 331 and the mating teeth 3311 are located opposite each other on both sides of the first limiting component 31. When the trimmer head 2 rotates in the first direction, it can move centrifugally under the action of the eccentric block 331. Optionally, the eccentric block 331 can also be located on both sides of the frame, away from the mating teeth 3311, without limitation. The specific structure of the eccentric block 331 is not limited and can be set according to the spatial dimensions, etc., and the weight of the eccentric block 331 can also be set according to experiments.

[0070] In this embodiment, the magnet 341 is disposed on the head shell assembly 21 and located at one end of the straight groove 321, so that the eccentric block 331 is located in the second position when attracted to the magnet 341.

[0071] This embodiment provides a lawn mower 100, which has a structure basically the same as that of Embodiment 1. The similarities will not be repeated here. Figure 13 and Figure 14 As shown, the difference between this embodiment and Embodiment 1 is that the outer periphery of the first limiting member 31 is provided with limiting teeth 311. Specifically, the first limiting member 31 is a ratchet seat, and the one-way limiting part of the ratchet seat is the limiting teeth 311 on the outer periphery of the ratchet seat; the movable member 33 is a rotating block 333, which is rotatably connected to the second limiting member 32 so that the rotating block 333 engages or disengages from the limiting teeth 311. The guide groove on the second limiting member 32 is an arc groove 322, and the rotating block 333 rotates along the arc groove 322. In one embodiment, the arc-shaped sidewall of the arc groove is used to restrict the rotating block 333 to move along the arc, and the end sidewalls at both ends are used for extreme position limiting. When the rotating block 333 moves to the end sidewall away from the limiting teeth 311, it is located in the first position, and when it moves to the end sidewall close to the limiting teeth 311, it is located in the second position.

[0072] In one embodiment, the center of the arc groove 322 is located outside the ratchet seat; in another embodiment, the center of the arc groove 322 may also be located inside the ratchet seat, or may be concentrically arranged with the ratchet seat. The arrangement can be made according to the actual structure and is not limited.

[0073] In one embodiment, two rotating blocks 333 are provided, each located on one side of a ratchet seat. The ratchet seat has two limiting teeth 311, which are respectively used to engage with the two rotating blocks 333. The second limiting member 32 has two arc grooves 322. In other embodiments, multiple rotating blocks 333 may be provided, spaced apart on the outer periphery of the ratchet seat, and correspondingly provided with multiple limiting teeth 311 and arc grooves 322.

[0074] In one embodiment, the rotating block 333 can be a long strip or an elliptical block, etc.; in some embodiments, the end of the rotating block 333 is provided with a toothed structure that cooperates with the limiting tooth 311. Refer to the prior art, and it will not be described in detail here.

[0075] In one embodiment, the magnet 341 is positioned near the ratchet seat and is attracted to the rotating block 333, which is in a second position and can be engaged with the limiting tooth 311.

[0076] This embodiment provides a lawn mower 100, which has a structure basically the same as that of Embodiment 1. The similarities will not be repeated here. Figures 15-17 As shown, the difference between this embodiment and Embodiment 1 is that the outer peripheral surface of the first limiting member 31 includes an inclined surface 312, the movable member 33 is a pin 334, and the sidewall of the second limiting member 32 surrounds the outer periphery of the first limiting member 31. A limiting groove is formed between the inclined surface 312 and the sidewall. The pin 334 moves relative to the first limiting member 31 to a position where it abuts against or disengages from the inclined surface 312. The second limiting member 32 is provided with a circular groove 323, and the first limiting member 31 is disposed in the circular groove 323. In this embodiment, the first limiting member 31 is a ratchet seat, and the ratchet seat is provided with protruding teeth 313. An inclined surface 312 is provided between two protruding teeth 313. The protruding teeth 313, the inclined surface 312, and the inner sidewall of the circular groove 323 form a limiting groove. The pin 334 moves within the limiting groove to prevent slippage. When the pin 334 moves centrifugally, the inner wall of the circular groove 323 is used to restrict the pin 334 to move circumferentially along the circular groove 323. Due to the inclined setting of the inclined surface 312, the width of the limiting groove formed by the inclined surface 312 and the inner wall of the circular groove 323 is different, with one end being wider and the other end being narrower. The inclined surface 312 on the narrower side and the protruding tooth 313 near the wider side are the two extreme positions of the pin 334. When the outer peripheral surface of the pin 334 abuts against the inclined surface 312, it is in the second position, and when the outer peripheral surface of the pin 334 abuts against the protruding tooth 313, it is in the first position.

[0077] In one embodiment, a plurality of pins 334 may be provided, and correspondingly, the same number of inclined surfaces 312 and protruding teeth 313 as the pins 334 may be provided. Increasing the number of pins 334 can increase the resistance between the pins 334 and the inclined surfaces 312 in the second position, thereby improving the reliability of the stop. Reducing the number of pins 334 can simplify the structure.

[0078] In one implementation, such as Figure 17 As shown, magnets 341 are located at the bottom of the circular groove 323. The number of magnets 341 is the same as the number of pins 334, and the magnets 341 are attracted to the pins 334. When the mowing head 2 rotates in the first direction, the second limiting member 32 rotates in the first direction and drives the pins 334 to rotate in the first direction to a position with a larger limiting groove width. That is, at this time, the pins 334 are in the first position. In this way, the first limiting member 31 allows the second limiting member 32 and the head shell assembly 21 to rotate, and the mowing machine 100 is in mowing mode. When the drive device 5 drives the spool 22 to rotate in the second direction, the spool 22 drives the head shell assembly 21 to rotate a small angle in the second direction. The head shell assembly 21 and the second limiting member 32 rotate synchronously. At this time, the second limiting member 32 drives the pin 334 to move a small distance through the magnet 341. In this way, the pin 334 moves to the side with the smaller width of the limiting groove and abuts against the inclined surface 312. Thus, the first limiting member 31 locks the rotation of the second limiting member 32 through the pin 334, thereby preventing the head shell assembly 21 from continuing to rotate in the second direction. The lawn mower 100 is in the winding mode.

[0079] Obviously, the above embodiments of this application are merely examples for clear illustration and are not intended to limit the implementation of this application. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A grass trimmer comprising: The machine comprises a front housing (1), a drive device (5), and a trimmer head (2), wherein the drive device (5) is configured to drive the trimmer head (2) to rotate around a first axis (X), and the trimmer head (2) includes: a head shell assembly (21) and a spool (22) cooperating with the head shell assembly (21), the spool (22) being used to wind trimmer rope (10); characterized in that the trimmer further includes: a limiting assembly (3), the limiting assembly (3) including: The first limiting member (31) is fixed relative to the front end housing (1) in the circumferential direction around the first axis (X); The second limiting member (32) rotates synchronously with the head shell assembly (21) or the spool (22) in the circumferential direction around the first axis (X); The movable part (33) has a first position and a second position. When the movable part (33) is in the first position, the movable part (33) allows the second limiting part (32) and the first limiting part (31) to rotate relative to each other, and the mower is in mowing mode; When the movable part (33) is in the second position, the first limiting part (31) prevents the movement of the second limiting part (32) through the movable part (33), and the lawn mower is in the winding mode; The first limiting member (31) is a ratchet seat, which is provided with a one-way limiting part. When the grass trimmer (2) rotates in the first direction, the movable member (33) moves to the first position and disengages from the one-way limiting part. When the grass trimmer (2) rotates in the second direction, the movable member (33) can move to the second position and abut against the one-way limiting part. The first direction and the second direction are opposite directions.

2. The lawn mower according to claim 1, characterized in that, The second limiting member (32) is provided with a guide groove, and the movable member (33) can move along the guide groove.

3. The lawn mower according to claim 1, characterized in that, The first limiting member (31) is detachably connected to the front end housing (1), and / or the second limiting member (32) is detachably connected to the grass trimmer (2).

4. The lawn mower according to claim 1, characterized in that, The movable part (33) moves from the second position to the first position under the action of centrifugal force.

5. The lawn mower according to claim 1, characterized in that, The movable part (33) is movably connected to the second limiting part (32).

6. The lawn mower according to claim 1, characterized in that, The limiting component (3) further includes a reset element (34) which can drive the movable part (33) to reset to the second position.

7. The lawn mower according to claim 6, characterized in that, The reset element (34) is a magnet (341), which is installed on the front housing (1) or the grass trimmer (2), and the magnet (341) is attracted to the movable part (33).

8. The lawn mower according to any one of claims 1-7, characterized in that, The first limiting member (31) has a limiting tooth (311) on its outer periphery. The movable member (33) is an eccentric block (331). The eccentric block (331) has a mating tooth (3311) that cooperates with the limiting tooth (311). The second limiting member (32) is used to restrict the rotation of the eccentric block (331) relative to the second limiting member (32) and allow the eccentric block (331) to move in a straight line relative to the second limiting member (32) so that the mating tooth (3311) abuts or disengages from the limiting tooth (311).

9. The lawn mower according to claim 8, characterized in that, The eccentric block (331) is connected to a counterweight (332), which causes the eccentric block (331) to undergo centrifugal motion as the grass-beating head (2) rotates.

10. The lawn mower according to any one of claims 1-7, characterized in that, The first limiting member (31) has a limiting tooth (311) on its outer periphery. The movable member (33) is a rotating block (333). The movable member (33) is rotatably connected to the second limiting member (32) so that the rotating block (333) can engage or disengage from the limiting tooth (311).

11. The lawn mower according to any one of claims 1-7, characterized in that, The outer peripheral surface of the first limiting member (31) includes an inclined surface (312), the movable member (33) is a pin (334), the side wall of the second limiting member (32) surrounds the outer periphery of the first limiting member (31), a limiting groove is formed between the inclined surface (312) and the side wall, and the pin (334) moves relative to the first limiting member (31) to a position that abuts or disengages from the inclined surface (312).

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