CN117652274A - Grass trimmer - Google Patents

Abstract

The application discloses grass trimmer belongs to grass trimmer technical field. The grass cutting machine comprises a front end shell, a driving device and a grass cutting head, wherein the driving device is arranged to drive the grass cutting head to rotate around a first axis, the grass cutting head comprises a head shell component and a spool matched with the head shell component, and the spool is used for winding a grass cutting rope; the grass cutting machine also comprises a limiting assembly, wherein the limiting assembly comprises a first limiting piece, a second limiting piece and a movable piece, and the first limiting piece is fixed relative to the front end shell in the circumferential direction around the first axis; the second limiting piece and the head shell assembly or the spool form synchronous rotation in the circumferential direction around the first axis; the movable piece is provided with a first position and a second position, when the movable piece is positioned at the first position, the movable piece allows the second limiting piece and the first limiting piece to rotate relatively, and the grass cutting machine is positioned in a grass cutting mode; when the movable piece is in the second position, the first limiting piece can prevent the second limiting piece from moving through the movable piece, and the grass cutting machine is in a winding mode. The application improves winding efficiency.

Description

Grass trimmer

Technical Field

The application relates to the technical field of grass mowers, in particular to a grass mowing machine.

Background

The grass trimmer comprises a grass trimmer head, wherein the grass trimmer head comprises a spool and a head shell for accommodating the spool. In the related art, when the grass trimmer requires winding, the spool is generally detached from the head housing to perform winding, and such winding reduces the working efficiency. In other related technologies, when the grass cutting machine needs to wind, a user needs to pass the grass cutting rope through the grass cutting head, then the user needs to hold the head shell with one hand and hold the winding part connected with the spool with the other hand so that the spool rotates relative to the head shell, and therefore the grass cutting rope is easy to wind to the arm of the user, the user's hand is easy to be polluted, the operation is inconvenient, and the working efficiency is low.

Disclosure of Invention

An object of the application is to provide a grass trimmer, convenient operation improves work efficiency.

To achieve the purpose, the application adopts the following technical scheme:

provided is a grass trimmer, comprising: front end casing, drive arrangement and grass-mowing head, drive arrangement sets up to drive grass-mowing head rotates around the first axis, grass-mowing head includes: the device comprises a head shell assembly and a spool matched with the head shell assembly, wherein the spool is used for winding a straw beating rope; the grass trimmer also comprises: spacing subassembly, spacing subassembly includes:

a first stopper fixed in a circumferential direction around the first axis with respect to the front end housing;

the second limiting piece and the head shell assembly or the spool form synchronous rotation in the circumferential direction around the first axis;

a movable member having a first position and a second position,

when the movable piece is positioned at the first position, the movable piece allows the second limiting piece and the first limiting piece to rotate relatively, and the grass cutting machine is positioned in a grass cutting mode;

when the movable piece is in the second position, the first limiting piece prevents the second limiting piece from moving through the movable piece, and the grass cutting machine is in a winding mode.

In some possible embodiments, the first limiting member is a ratchet seat, the ratchet seat is provided with a unidirectional limiting portion, and when the grass-mowing head rotates in a first direction, the movable member moves to the first position and is separated from the unidirectional limiting portion; when the grass mowing head rotates to a second direction, the movable piece can move to the second position and is abutted to the unidirectional limiting part, and the first direction and the second direction are opposite.

In some possible embodiments, the second limiting member is provided with a guide groove along which the movable member is movable.

In some possible embodiments, the first stop member is detachably connected to the front end housing, and/or the second stop member is detachably connected to the grass cutting head.

In some possible embodiments, the moveable member moves from the second position to the first position under centrifugal force.

In some possible embodiments, the movable member is movably connected to the second limiting member.

In some possible embodiments, the stop assembly further comprises a reset element capable of driving the moveable member to reset to the second position.

In some possible embodiments, the reset element is a magnet, the magnet is mounted on the front end housing or the grass-mowing head, and the magnet is in adsorption connection with the movable piece.

In some possible embodiments, the periphery of the first limiting member is provided with a limiting tooth, the movable member is an eccentric block, the eccentric block is provided with a matching tooth matched with the limiting tooth, and the second limiting member is used for limiting the rotation of the eccentric block relative to the second limiting member and allowing the eccentric block to move along a straight line relative to the second limiting member, so that the matching tooth is abutted to or separated from the limiting tooth.

In some possible embodiments, the eccentric block is connected with a balancing weight, so that the eccentric block makes centrifugal movement when rotating along with the grass cutting head.

In some possible embodiments, the 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 is clamped with or separated from the limiting teeth.

In some possible embodiments, the outer peripheral surface of the first limiting member includes an inclined surface, the movable member is a pin, the side wall of the second limiting member is enclosed on the outer periphery of the first limiting member, a limiting groove is formed between the inclined surface and the side wall, and the pin moves to a position abutting against or separating from the inclined surface relative to the first limiting member.

The beneficial effects of this application:

the utility model provides a pair of grass cutting machine, through setting up spacing subassembly, grass cutting machine is in mode or the wire winding mode of beating grass, and during the wire winding mode, first locating part prevents the motion of second locating part through the moving part, and drive arrangement drive grass cutting head makes spool and head shell subassembly relative motion, and the rope of will beating grass is twined on the spool automatically, convenient operation has improved wire winding efficiency, and then has improved work efficiency.

Drawings

FIG. 1 is a schematic view of a grass trimmer according to a first embodiment;

FIG. 2 is a schematic view of a grass cutting head and a front end housing according to a first embodiment;

FIG. 3 is a schematic view of the handle of FIG. 2 in a raised position;

FIG. 4 is a longitudinal cross-sectional view of FIG. 2;

FIG. 5 is a longitudinal cross-sectional view of the front end housing of FIG. 2 without the front end housing;

FIG. 6 is an exploded view of the front end housing of FIG. 2, shown without the front end housing, from a single perspective;

FIG. 7 is an exploded view of the front end housing of FIG. 2 without the front end housing in another view;

FIG. 8 is a cross-sectional view of the moveable member provided in the first position;

FIG. 9 is a cross-sectional view of the moveable member provided in the first embodiment in a second position;

FIG. 10 is a schematic view of a movable member in a second position according to the first embodiment;

FIG. 11 is a schematic view of a movable member in a first position according to the first embodiment;

fig. 12 is an assembly schematic diagram of a first stop member and head shell assembly according to the first embodiment;

FIG. 13 is a cross-sectional view of the movable member provided in the second embodiment in a second position;

FIG. 14 is a cross-sectional view of the movable member provided in the second embodiment in a first position;

FIG. 15 is a cross-sectional view of the movable member provided in the third embodiment in a first position;

FIG. 16 is a cross-sectional view of the movable member provided in the third embodiment in a second position;

fig. 17 is an exploded view of a movable member and a second stopper according to the third embodiment.

In the figure:

1. a front end housing; 2. grass cutting head; 21. a head shell assembly; 211. an upper housing; 212. a lower housing; 213. a support; 22. a spool; 23. a cover plate;

3. a limit component;

31. a first limiting member; 311. limit teeth; 312. an inclined plane; 313. convex teeth;

32. a second limiting piece; 321. a linear groove; 322. an arc groove; 323. a circular groove;

33. a movable member; 331. an eccentric block; 3311. mating teeth; 3312. a circular protrusion; 332. balancing weight; 333. a rotating block; 334. a pin shaft;

34. a reset element; 341. a magnet;

4. a crank; 5. a driving device; 51. a mounting bracket; 7. an elastic member; 8. a connecting rod assembly; 9. a battery pack; 10. beating grass ropes; 11. an operating device;

100. a grass cutter; x, first axis.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present application more clear, the technical solutions of the embodiments of the present application will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

In the description of the present application, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

In this application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The present embodiment provides a grass trimmer 100, as shown in fig. 1-12, the grass trimmer 100 includes a front end housing 1, a driving device 5 and a grass trimmer head 2, the driving device 5 is configured to drive the grass trimmer head 2 to rotate around a first axis X, the grass trimmer head 2 includes a head housing assembly 21 and a spool 22 cooperating with the head housing assembly 21, and the spool 22 is used for winding a grass tying rope 10; the grass trimmer 100 further comprises a limiting assembly 3, and the limiting assembly 3 comprises a first limiting piece 31, a second limiting piece 32 and a movable piece 33. Wherein the first limiting member 31 is fixed with respect to the front end housing 1 in a circumferential direction around the first axis X, the second limiting member 32 and the head housing assembly 21 or the spool 22 are rotated synchronously in the circumferential direction around the first axis X, and the movable member 33 has a first position and a second position.

By changing the position of the movable member 33 in the limiting assembly 3, when the movable member 33 is in the first position, the movable member 33 allows the second limiting member 32 and the first limiting member 31 to rotate relatively, the driving device 5 drives the spool 22 and the head shell assembly 21 to rotate simultaneously, so as to drive the grass mowing rope 10 on the spool 22 to rotate, and the grass mowing machine 100 is in a grass mowing mode. When the movable member 33 is in the second position, the first limiting member 31 prevents the second limiting member 32 from moving through the movable member 33, the driving device 5 drives one of the spool 22 and the head housing assembly 21 to rotate, the other is relatively fixed with the front end housing 1, the mowing rope 10 can be wound on the spool 22, and the mowing machine 100 is in a winding mode. Through setting up spacing subassembly 3, drive arrangement 5 can drive grass cutting head 2 and twine grass cutting rope 10 on spool 22 automatically, convenient operation has improved wire winding efficiency, and then has improved work efficiency.

The axial movement of the first limiting member 31 and the second limiting member 32 has no or little influence on the circumferential rotation of the spool 22 and the head housing assembly 21 about the first axis X, and in this embodiment, the first limiting member 31 may be a fixed or non-fixed structure with respect to the front end housing 1 in the axial direction, and the second limiting member 32 may be a fixed or non-fixed structure with respect to the head housing assembly 21 or the spool 22 in the axial direction, and is not limited.

In one embodiment, the movable member 33 is movably coupled to the second spacing member 32. Through setting up respectively and locating first locating part 31 on the front end casing 1, locating second locating part 32 on head housing subassembly 21 or the spool 22, the activity locates first locating part 31 and second locating part 32 moving part 33, spare part quantity is few, and the cooperation relationship is simple, and convenient equipment, the scheme is realized relatively easily, and manufacturing cost is low, and can dismantle respectively and change etc. has prolonged the life of grass cutting head 2, and when certain part takes place to damage and can replace alone wherein, the cost is reduced. In one embodiment, the first limiting member 31 may be detachably connected to the front end housing 1 by a fastener, etc., and similarly, the second limiting member 32 may also be detachably connected to the grass cutting head 2 by a fastener.

In one embodiment, as shown in fig. 1-3, the grass cutting machine 100 further includes a crank 4, and in a winding mode, the crank 4 is lifted to rotate to realize winding, and in a grass cutting mode, the crank 4 is placed down to avoid misoperation, and specific connection modes, structures and the like refer to the prior art. The grass cutting machine 100 further comprises an operating device 11 and a connecting rod assembly 8, wherein the connecting rod assembly 8 is arranged above the grass cutting head 2, the operating device 11 is connected to the connecting rod assembly 8, the operating device 11 can be held during weeding, and an operating button and the like can be arranged on the operating device 11, so that the grass cutting machine is realized according to the prior art; further, a battery pack 9 is mounted on the operation device 11, and the battery pack 9 is used for power supply of the operation device 11, the driving device 5, and the like in the grass trimmer 100.

As shown in fig. 4 and 5, further, when the motor is provided at the front end of the link assembly 8, the driving device 5 can be understood as a motor. When the motor is provided at the rear end of the linkage assembly 8, the driving means 5 may be understood as a gear set provided in the front end housing 1 connecting the motor and the grass-cutting head 2. The output shaft of the drive means 5 may be connected to either the spool 22 or the head housing assembly 21, which is capable of directly driving the other to rotate about the first axis X. In one embodiment, the driving device 5 further includes a mounting bracket 51 for mounting the front end housing 1 and the like.

In some embodiments, spool 22 is housed within head housing assembly 21, spool 22 being provided with an internal threading aperture for securing grass rope 10 or for passing grass rope 10 therethrough; the head housing assembly 21 is formed with an outer threading hole through which the grass rope 10 passes. As one implementation, the head housing assembly 21 includes an upper housing 211 and a lower housing 212, which enables the head housing assembly 21 to be easily assembled with the spool 22 and also facilitates a user to open the head housing assembly 21 to detect conditions inside the head housing assembly 21. In some embodiments, a supporting member 213 having a supporting function is further connected to a side of the upper housing 211 facing away from the lower housing 212, and fan blades or the like may be disposed on the supporting member 213 so as to form an air flow for cooling.

In one embodiment, the grass cutting head 2 further includes an elastic member 7 disposed between the head housing assembly 21 and the spool 22 for applying a force, and the elastic member 7 may be a spring, both ends of which are abutted between the lower housing 212 and the spool 22, and the spring applies a force to move the spool 22 away from the lower housing 212.

In one embodiment, when a user needs to replenish a new straw rope 10, the user can align the inner and outer threading holes, then pass the straw rope 10 through the outer threading hole, and then enter the inner threading hole, and at this time, the limiting action of the outer threading Kong Duida straw rope 10 can cause the straw rope 10 to gradually wind the straw rope 10 on the spool 22 along with the movement of the outer threading hole relative to the spool 22, so long as the spool 22 and the head housing assembly 21 can be relatively moved.

For convenience of description, in this embodiment, the case where the second limiting member 32 and the head housing assembly 21 are synchronously rotated in the circumferential direction around the first axis X is exemplified, the first limiting member 31 prevents the second limiting member 32 from moving by the movable member 33 to prevent the head housing assembly 21 from moving, and when the driving device 5 drives the grass cutting head 2 to rotate around the first axis X, only the spool 22 rotates around the first axis X, thereby realizing winding of the grass cutting rope 10 around the spool 22. In the present embodiment, the second limiting member 32 is integrally formed with the supporting member 213, and the second limiting member 32 is formed by the supporting member 213, or the supporting member 213 is understood to include the second limiting member 32. In other embodiments, the second stop 32 may also be attached to the support 213 by fasteners. In some embodiments, a cover 23 is disposed on a side of the support 213 facing away from the lower housing 212, and a movable member 33 is disposed between the cover 23 and the second limiting member 32 to achieve axial limitation.

In one embodiment, the first limiting member 31 is a ratchet seat, the ratchet seat is provided with a unidirectional limiting portion, when the grass cutting head 2 rotates in the first direction, the movable member 33 moves to the first position and is separated from the unidirectional limiting portion, so as to unlock the second limiting member 32, and further unlock the head shell assembly 21 from the front end shell 1, and the head shell assembly 21 and the spool 22 can rotate simultaneously. When the spool 22 rotates towards the second direction, the movable piece 33 can move to the second position and is abutted against the unidirectional limiting part, so that the second limiting piece 32 is locked, the head shell assembly 21 and the front end shell 1 are locked, and the head shell assembly 21 is prevented from moving, wherein the first direction and the second direction are opposite directions. The movable piece 33 is limited in one direction by the one-way limiting part arranged on the ratchet seat, so that the one-way limiting of the head shell assembly 21 is realized, a grass mowing mode is realized when the grass mowing head 2 is driven to rotate in a first direction, and a winding mode is realized when the spool 22 is driven to rotate in a second direction. In this embodiment, the ratchet seat is connected to the front end housing 1 by a bolt.

In one embodiment, the second limiting member 32 is provided with a guide groove, the movable member 33 can move along the guide groove, so that the movement precision is improved, the reliability of the relative rotation of the first limiting member 31 and the second limiting member 32 is ensured, and the reliability of the movement of the first limiting member 31 through the movable member 33 for preventing the second limiting member 32 is ensured.

In the process that the grass cutting head 2 rotates in the first direction, the movable piece 33 moves along with the grass cutting head 2 and is acted by centrifugal force, in one embodiment, the movable piece 33 moves from the second position to the first position under the action of centrifugal force, and when the movable piece 33 moves to the first position in the second position, no additional acting force is needed to be applied to the movable piece 33, so that the grass cutting head is convenient to use.

In one embodiment, the limiting component 3 further includes a reset element 34, and the reset element 34 can drive the movable component 33 to reset to the second position, so that no additional force is required to be applied when the movable component moves from the first position to the second position, and the use is convenient. In one embodiment, the reset element 34 is a magnet 341, the magnet 341 is mounted on the front end housing 1 or the grass-cutting head 2, and the magnet 341 is attached to the movable member 33 by suction. The movable piece 33 is attracted to the magnet 341, when the grass-mowing head 2 rotates in the first direction, the centrifugal force is larger than the attraction force, and the movable piece 33 moves centrifugally from the second position to the first position; when the rotation in the first direction is stopped, the movable member 33 is attracted by the magnet 341 and moves from the first position to the second position. In another embodiment, the return element 34 is a spring, one end of which is connected to the front end housing 1 or the grass-cutting head 2, and the other end of which is connected to the movable element 33; the movable piece 33 is elastically connected with a spring, when the grass cutting head 2 rotates in a first direction, the centrifugal force is larger than the elastic force, and the movable piece 33 moves centrifugally and moves from the second position to the first position; when the rotation in the first direction is stopped, the movable member 33 is moved from the first position to the second position by the elastic force.

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 unidirectional limiting part of the ratchet seat is the limiting teeth 311 on the outer periphery of the ratchet seat; the movable part 33 is an eccentric block 331, the eccentric block 331 is provided with a mating tooth 3311 mated with the limiting tooth 311, and the second limiting part 32 is used for limiting the rotation of the eccentric block 331 relative to the second limiting part 32 and allowing the eccentric block 331 to move along a straight line relative to the second limiting part 32, so that the mating tooth 3311 is abutted against or separated from the limiting tooth 311. Specifically, the guiding groove on the second limiting member 32 is a linear groove 321, and the movable member 33 moves along the linear groove 321. As shown in fig. 8 and 11, the movable member 33 is in the first position, the stopper tooth 311 is disengaged from the mating tooth 3311, and as shown in fig. 9 and 10, the movable member 33 is in the second position; in this embodiment, the eccentric block 331 includes a frame, the inside of the frame is provided with a mating tooth 3311, the ratchet seat is arranged inside the frame, the frame is positioned inside the linear groove 321, and the outside of the frame slides along the linear groove 321; further, the outer periphery of the frame is provided with a circular protrusion 3312 which is in sliding connection with the groove wall of the linear groove 321, so that the stress area is reduced, and the frame is convenient to slide between the first position and the second position; the frame may be slidably connected to the left and right side walls or the bottom wall of the linear groove 321, so as to limit the movement of the movable member 33 along the linear direction, which is not limited. In some embodiments, the linear groove 321 is slidably connected to the frame on the left and right side walls or one side wall in fig. 8 and 9, the linear groove 321 has a limiting effect on the upper and lower side walls in fig. 8 and 9, the eccentric block 331 is abutted to the first position when the upper side wall is abutted, and the eccentric block 331 is abutted to the second position when the lower side wall is abutted. The shapes of the limiting teeth 311 and the mating teeth 3311 may be set with reference to a ratchet mechanism in the prior art, and will not be described again.

In other embodiments, the movable member 33 may also have a linear rail shape, where one side is provided with the engaging teeth 3311, and the other side is slidably connected to the linear slot 321.

In one embodiment, the limiting assembly 3 further includes a balancing weight 332, and the center of gravity of the eccentric weight 331 is deviated from the first axis X, so that the balancing weight 332 can balance the unbalance of the eccentric weight 331, and can reduce the vibration generated by the grass cutting head 2 during the rotation process. The center of gravity of the eccentric block 331 and the matching teeth 3311 are arranged on two sides of the first limiting piece 31 relatively, and when the grass cutting head 2 rotates in the first direction, the eccentric block 331 can centrifugally move under the action of the eccentric block 331; alternatively, the eccentric blocks 331 may be disposed on both sides of the frame, and may be disposed away from the mating teeth 3311, without limitation. The specific structure of the eccentric mass 331 is not limited, and may be set according to the space size or the like, or the weight of the eccentric mass 331 may be set according to the test or the like.

In this embodiment, the magnet 341 is disposed on the head housing assembly 21 and is located at one end of the linear slot 321, so that the eccentric block 331 is located at the second position when the eccentric block is attracted to the magnet 341.

The present embodiment provides a grass cutting machine 100, which has substantially the same structure as the first embodiment, and the same features are not repeated, as shown in fig. 13 and 14, the difference between the first embodiment and the first embodiment is that the outer periphery of the first limiting member 31 is provided with a limiting tooth 311, specifically, the first limiting member 31 is a ratchet seat, and the unidirectional limiting portion of the ratchet seat is a limiting tooth 311 on the outer periphery of the ratchet seat; the movable member 33 is a rotating block 333, and the rotating block 333 is rotatably connected to the second limiting member 32 to enable the rotating block 333 to be clamped with or separated from the limiting teeth 311. The guiding groove on the second limiting part 32 is an arc groove 322, and the rotating block 333 rotates along the arc groove 322. In one embodiment, the arc-shaped side walls of the arc-shaped groove are used for limiting the rotation block 333 to move along the arc, the end side walls at the two ends are used for limiting the limit position, the rotation block 333 is located at the first position when moving to the end side wall far away from the limiting teeth 311, and is located at the second position when moving to the end side wall close to the limiting teeth 311.

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 be located inside the ratchet seat or concentric with the ratchet seat, and may be set according to the actual structure, which is not limited.

In one embodiment, two rotating blocks 333 are provided, the two rotating blocks 333 are provided with two sides of a ratchet seat, two limiting teeth 311 are provided on the ratchet seat and are respectively used for being matched with the two rotating blocks 333, and the second limiting piece 32 is provided with two circular arc grooves 322. In other embodiments, a plurality of rotating blocks 333 may be provided, and the plurality of rotating blocks 333 are disposed at intervals on the outer periphery of the ratchet seat, and a plurality of limiting teeth 311 and circular arc grooves 322 are correspondingly provided.

In one embodiment, the rotating block 333 may be an elongated block, an oval block, or the like; in some embodiments, the end of the rotating block 333 is provided with a tooth structure that is matched with the limiting teeth 311, which is described in detail below with reference to the prior art.

In one embodiment, the magnet 341 is disposed near the ratchet seat, and is attracted to the rotating block 333, where the rotating block 333 is located at the second position and can be clamped on the limiting teeth 311.

The present embodiment provides a grass cutting machine 100, which has substantially the same structure as the first embodiment, and is not described in detail, as shown in fig. 15-17, the difference between the first embodiment and the first embodiment is that the outer circumferential surface of the first limiting member 31 includes a bevel 312, the movable member 33 is a pin 334, the side wall of the second limiting member 32 is enclosed on the outer circumference of the first limiting member 31, a limiting groove is formed between the bevel 312 and the side wall, and the pin 334 moves to a position abutting against or separating from the bevel 312 relative to the first limiting member 31. The second limiting piece 32 is provided with a circular groove 323, and the first limiting piece 31 is arranged in the circular groove 323; in this embodiment, the first limiting member 31 is a ratchet seat, the ratchet seat is provided with teeth 313, an inclined plane 312 is disposed between the teeth 313, limiting grooves are formed on the inner side walls of the teeth 313, the inclined plane 312 and the circular groove 323, and the pin 334 moves in the limiting grooves to prevent slipping. When the pin shaft 334 moves centrifugally, the inner side wall of the circular groove 323 is used for limiting the pin shaft 334 to move along the circular groove 323 in a circular manner, due to the inclined arrangement of the inclined surface 312, the width of a limiting groove formed by the inclined surface 312 and the inner side wall of the circular groove 323 is different, one end of the limiting groove is larger in width, the other end of the limiting groove is smaller in width, the inclined surface 312 on the smaller side and the convex tooth 313 close to the larger side in width are two limit positions of the pin shaft 334, the outer peripheral surface of the pin shaft 334 is located in the second position when being abutted against the inclined surface 312, and the outer peripheral surface of the pin shaft 334 is located in the first position when being abutted against the convex tooth 313.

In one embodiment, a plurality of pins 334 may be provided, and accordingly, the same number of inclined surfaces 312 and teeth 313 as the pins 334 may be provided, increasing the number of pins 334, increasing the resistance between the pins 334 and the inclined surfaces 312 in the second position, improving the blocking reliability, reducing the number of pins 334, and simplifying the structure.

In one embodiment, as shown in fig. 17, the magnets 341 are disposed at the bottom of the circular recess 323, and the number of the magnets 341 is the same as the number of the pins 334, and the magnets 341 are attracted to the pins 334. When the grass cutting head 2 rotates in the first direction, the second limiting member 32 rotates in the first direction and drives the pin shaft 334 to rotate in the first direction to a position with a larger width of the limiting groove, that is, the pin shaft 334 is located at the first position, so that the first limiting member 31 allows the second limiting member 32 and the head shell assembly 21 to rotate, and the grass cutting machine 100 is in the grass cutting mode. When the driving device 5 drives the spool 22 to rotate along the second direction, the spool 22 drives the head shell assembly 21 to rotate a small angle along the second direction, the head shell assembly 21 and the second limiting member 32 form synchronous rotation, at this time, the second limiting member 32 drives the pin shaft 334 to also move a small distance through the magnet 341, so that the pin shaft 334 moves to one side with a smaller width of the limiting groove and abuts against the inclined plane 312, and the first limiting member 31 locks the rotation of the second limiting member 32 through the pin shaft 334, thereby preventing the head shell assembly 21 from continuing to rotate along the second direction, and the grass cutting machine 100 is in a winding mode.

It is apparent that the above examples of the present application are merely illustrative examples of the present application and are not limiting of the embodiments of the present application. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modifications, equivalent substitutions, improvements, etc. that fall within the spirit and principles of the present application are intended to be included within the scope of the claims of this application.

Claims (12)

1. A grass trimmer comprising: front end casing (1), drive arrangement (5) and grass cutting head (2), drive arrangement (5) set up to drive grass cutting head (2) rotate around first axis (X), grass cutting head (2) include: a head housing assembly (21) and a spool (22) cooperating with the head housing assembly (21), the spool (22) being for winding a straw rope (10); the grass trimmer is characterized by further comprising: spacing subassembly (3), spacing subassembly (3) include:

a first stopper (31) fixed with respect to the front end housing (1) in a circumferential direction around the first axis (X);

a second stopper (32) that makes a synchronous rotation with the head case assembly (21) or the spool (22) in a circumferential direction around the first axis (X);

a movable member (33) having a first position and a second position,

when the movable piece (33) is positioned at the first position, the movable piece (33) allows the second limiting piece (32) and the first limiting piece (31) to rotate relatively, and the grass cutting machine is in a grass cutting mode;

when the movable piece (33) is in the second position, the first limiting piece (31) prevents the second limiting piece (32) from moving through the movable piece (33), and the grass cutting machine is in a winding mode.

2. The grass cutting machine according to claim 1, wherein the first limiting member (31) is a ratchet seat, the ratchet seat is provided with a unidirectional limiting portion, and the movable member (33) moves to the first position and is separated from the unidirectional limiting portion when the grass cutting head (2) rotates in a first direction; when the grass cutting head (2) rotates to a second direction, the movable piece (33) can move to the second position and is abutted to the unidirectional limiting part, and the first direction and the second direction are opposite.

3. Grass trimmer according to claim 1, characterized in that the second limiting element (32) is provided with a guide slot along which the movable element (33) can move.

4. Grass cutting machine according to claim 1, characterized in that the first stop (31) is detachably connected to the front end housing (1) and/or the second stop (32) is detachably connected to the grass cutting head (2).

5. Grass trimmer according to claim 1, characterized in that the movable element (33) is moved from the second position to the first position under the influence of centrifugal force.

6. A grass cutting machine according to claim 1, wherein the movable member (33) is movably connected to the second limiting member (32).

7. Grass cutting machine according to claim 1, characterized in that the limit assembly (3) further comprises a reset element (34), the reset element (34) being able to drive the movable element (33) to reset to the second position.

8. The grass cutting machine as claimed in claim 7, wherein the return element (34) is a magnet (341), the magnet (341) is mounted on the front end housing (1) or the grass cutting head (2), and the magnet (341) is in adsorption connection with the movable member (33).

9. The grass cutting machine as claimed in any one of claims 1-8, wherein the outer periphery of the first limiting member (31) is provided with limiting teeth (311), the movable member (33) is an eccentric block (331), the eccentric block (331) is provided with mating teeth (3311) mating with the limiting teeth (311), and the second limiting member (32) is used for limiting the rotation of the eccentric block (331) relative to the second limiting member (32) and allowing the eccentric block (331) to move along a straight line relative to the second limiting member (32), so that the mating teeth (3311) are abutted against or separated from the limiting teeth (311).

10. Grass cutting machine according to claim 9, characterized in that the eccentric mass (331) is connected with a counterweight (332) for the eccentric mass (331) to perform a centrifugal movement when rotating with the grass cutting head (2).

11. Grass cutting machine according to any one of claims 1-8, characterized in that the outer circumference of the first limiting part (31) is provided with limiting teeth (311), the movable part (33) is a rotating block (333), and the movable part (33) is rotatably connected to the second limiting part (32) so that the rotating block (333) is clamped with or separated from the limiting teeth (311).

12. The grass cutting machine according to any one of claims 1-8, wherein the outer circumferential surface of the first limiting member (31) includes a slope (312), the movable member (33) is a pin (334), the side wall of the second limiting member (32) is disposed around the outer circumference of the first limiting member (31), a limiting groove is formed between the slope (312) and the side wall, and the pin (334) moves to a position abutting against or separating from the slope (312) relative to the first limiting member (31).