CN111837590A - Grass mowing head and grass mowing machine - Google Patents

Abstract

The invention discloses a grass mowing head and a grass mowing machine, wherein the grass mowing head comprises: a spool, a head housing, and a drive device; the spool comprises a winding part for winding the grass cutting rope, the head shell surrounds a containing space for containing at least part of the spool, and the driving device is used for driving at least one of the spool and the head shell to enable the spool and the head shell to generate relative rotation so as to wind the grass cutting rope on the spool; wherein, drive arrangement includes: an energy storage element; the energy storage element drives at least one of the bobbin and the head housing to cause relative rotation between the bobbin and the head housing upon release of the stored energy. The grass cutting head has good universality, and automatic winding can be realized without depending on a prime motor in the grass cutting machine.

Description

Grass mowing head and grass mowing machine

Technical Field

The invention relates to a garden tool, in particular to a grass trimmer and a grass trimming head thereof.

Background

A grass trimmer is a garden tool and is used for trimming lawns. The grass trimmer comprises a grass trimming head. The grass cutting head rotates at a high speed to drive the grass cutting rope arranged on the grass cutting head to rotate so as to realize the cutting function.

The grass cutting head comprises a spool for winding the grass cutting rope, and the grass cutting rope is gradually consumed due to abrasion when grass cutting operation is carried out. After a certain period of time, the user needs to replace the grass cutting cord with a new one and wind the cord onto the spool. Traditional rope of beating grass, the user need go the manual spool that rotates so that the rope of beating grass twines the spool, troublesome poeration, winding speed is slow, thereby also brings certain risk because the staff contacts the head of beating grass at winding in-process. And for the transmission grass cutting head, the winding process also needs to depend on a motor, so that the general performance of the grass cutting head is poor.

Disclosure of Invention

In order to solve the defects of the prior art, the invention aims to provide the grass cutting head which has good universality and can realize automatic winding without depending on a main machine part of the grass cutting machine.

In order to achieve the above object, the present invention adopts the following technical solutions:

a grass-mowing head comprising: a spool including a winding portion for winding a grass cutting cord; a head housing formed around a receiving space for receiving at least a portion of the bobbin; a driving device for driving at least one of the spool and the head housing to generate relative rotation between the spool and the head housing to wind the mowing cord to the spool; wherein, drive arrangement includes: and an energy storage element for driving at least one of the bobbin and the head housing to generate relative rotation when releasing the stored energy.

Further, the energy storage element is at least partially disposed within the receiving space.

Further, the energy storage element is an elastic element.

Further, the energy storage element is a coil spring, and one end of the coil spring is connected with the bobbin.

Further, the driving device further includes: and the energy transfer element is used for transferring other energy to the energy storage element and driving the energy storage element to store energy.

Further, the grass mowing head further comprises an operating piece connected to the head shell or the spool and used for being operated by a user; when the user operates the operating member, the energy storage element stores energy.

Further, the grass mowing head further comprises an operating piece connected to the head shell or the spool and used for being operated by a user; when the user operates the operating member, the energy storage element releases the stored energy.

Furthermore, the grass mowing head also comprises a limiting device used for limiting the energy storage element to release energy.

A lawnmower comprising: a prime mover and said grass-mowing head; the prime mover is used for driving the grass cutting head to rotate by taking a central axis as an axis.

A grass-mowing head comprising: a spool including a winding portion for winding a grass cutting cord; a head housing formed around a receiving space for receiving at least a portion of the bobbin; a driving device for driving at least one of the spool and the head housing to generate relative rotation between the spool and the head housing to wind the mowing cord to the spool; the drive device includes: the operating piece is rotationally connected with the head shell; the transmission assembly is used for realizing power transmission between the operating member and the spool; when the operating piece is rotated for M circles, the transmission component drives the spool to rotate for N circles, wherein the ratio of M to N is larger than 1 and smaller than or equal to 10.

A grass-mowing head comprising: a spool including a winding portion for winding a grass cutting cord; a head housing formed around a receiving space for receiving at least a portion of the bobbin; a driving device for driving at least one of the spool and the head housing to rotate the spool or the head housing to wind the mowing cord to the spool; the driving device includes: the operating piece is movably connected with the head shell; a transmission assembly for effecting power transfer between the operating member and the spool; wherein the transmission assembly drives the spool to move in a second motion relative to the head housing when the operating member moves in a first motion relative to the head housing.

Further, the first movement mode is that the operating piece slides relative to the head shell, and the second movement mode is that the spool rotates relative to the head shell.

Further, the first movement form is that the operating member rotates relative to the head shell, and the second movement form is that the spool rotates relative to the head shell; and when the operating piece rotates M times relative to the head shell, the transmission assembly drives the bobbin to rotate N times, wherein the ratio of M to N is greater than 1.

The invention has the advantages that: the grass cutting head has good universality, and automatic winding can be realized without depending on a prime motor in the grass cutting machine.

Drawings

FIG. 1 is a perspective view of a lawnmower according to a first embodiment of the present invention;

FIG. 2 is a plan view of the grass-mowing head of FIG. 1;

FIG. 3 is a cross-sectional view of the grass-mowing head of FIG. 2 taken along line A-A;

FIG. 4 is a bottom view of the upper cover, bobbin, and energy storage element of FIG. 3;

FIG. 5 is an exploded view of the grass-mowing head of FIG. 2;

FIG. 6 is an exploded view from another perspective of the grass-mowing head of FIG. 2;

FIG. 7 is a plan view of a grass cutting head in a grass cutting machine according to a second embodiment of the present invention;

FIG. 8 is a cross-sectional view of the grass-mowing head of FIG. 7 taken along line B-B;

FIG. 9 is an exploded view of the grass-mowing head of FIG. 7;

FIG. 10 is an exploded view from another perspective of the grass-mowing head of FIG. 7;

FIG. 11 is a perspective view of the spool, drive device and mowing cord of FIG. 10;

FIG. 12 is a cross-sectional view of the grass-mowing head of FIG. 7 taken along line C-C;

FIG. 13 is an enlarged view of a portion of the structure of FIG. 12;

FIG. 14 is a perspective view of a grass cutting head in a lawnmower according to a third embodiment of the present invention;

FIG. 15 is an exploded view of the grass-mowing head of FIG. 14;

FIG. 16 is an exploded view from another perspective of the grass-mowing head of FIG. 14;

FIG. 17 is a perspective view of the drive device, fan assembly and spindle portion of FIG. 16 with the operating member in a first position;

FIG. 18 is a perspective view of the drive device, fan assembly and spindle portion of FIG. 16 with the operating member in a second position;

FIG. 19 is a plan view of a grass cutting head in a grass trimmer according to a fourth embodiment of the present invention;

FIG. 20 is an exploded view of the grass-mowing head of FIG. 19;

FIG. 21 is an exploded view from another perspective of the grass-mowing head of FIG. 19;

FIG. 22 is a plan view of a grass cutting head in a grass cutting machine according to a fifth embodiment of the present invention;

fig. 23 is a cross-sectional view of the grass-mowing head in fig. 22.

Detailed Description

As shown in fig. 1 to 6, the grass trimmer 1 includes a grass trimmer head 10, a prime mover 101, an operation device 102, and an energy device 103.

The grass mowing head 10 is used for installing and storing the grass mowing rope 100, the part of the grass mowing rope 100 is stored in the grass mowing head 10, and the other part of the grass mowing head 10 extends out of the grass mowing head 10 to be used for cutting vegetation when the grass mowing head 10 rotates.

The prime mover 101 is embodied as a motor for driving the grass-mowing head 10 to rotate around a central axis 10a, and the motor comprises or is connected with a drive shaft 101a connected with the grass-mowing head 10. The drive shaft 101a drives the grass cutting head 10 to rotate, thereby driving the grass cutting rope 100 to rotate to cut vegetation. The operating device 102 is used for operation by a user to control the lawnmower 1. The operating device 102 may include a main switch 102a for operation by a user to activate the motor. The energy source device 103 comprises a battery pack 103a for powering the lawnmower 1. The grass trimmer 1 further comprises a connecting rod 104, one end of the connecting rod 104 is connected with the prime mover 101, and the other end of the connecting rod 104 is connected with the operating device 102.

In the present embodiment, the grass trimmer 1 can also be adapted to grass-mowing heads 10 with different structures or functions, that is, the prime mover 101 and the grass-mowing head 10 are detachably connected, so that the grass-mowing head 10 can be sold separately. When purchasing the grass trimmer 1, a user can purchase one grass trimmer 1 and additionally a plurality of grass trimmers 10. In this way, the user can make the grass trimmer 1 realize different functions by replacing different grass trimming heads 10, thereby meeting different requirements, further facilitating the operation of the user and saving the cost.

The grass mowing head 10 specifically comprises: a spool 11, a head housing 12 and a fan assembly 13. The spool 11 includes a winding portion 111 for winding the mowing cord 100, and the spool 11 is at least partially accommodated in an accommodating space 12a surrounded by the head housing 12. The bobbin 11 is provided with inner threading holes 112, the inner threading holes 112 are used for fixing the grass mowing rope 100 or allowing the grass mowing rope 100 to pass through, and the number of the inner threading holes 112 may be multiple, for example, in the present embodiment, the number of the inner threading holes 112 is 6. The head shell 12 is formed with an external threading hole 121 through which the grass mowing cord 100 passes. As one implementation, the head housing 12 includes an upper cover 122, a lower cover 123 and a line outlet buckle 124, and the upper cover 122 and the lower cover 123 form a detachable connection, such as a snap connection, which enables the head housing 12 to be easily assembled with the bobbin 11 and also facilitates a user to open the head housing 12 to detect a situation inside the head housing 12. The outer threading hole 121 is formed by an outer threading buckle 124. When the grass mowing rope 100 needs to be wound on the spool 11, a user can align the inner threading holes 112 and the outer threading holes 121, then sequentially pass the grass mowing rope 100 through one outer threading hole 121, one inner threading hole 112, the other inner threading hole 112 and the other outer threading hole 121, a part of the grass mowing rope 100 is positioned in the accommodating space 12a formed by the head shell 12 in a surrounding mode, a part of the grass mowing rope 100 is positioned outside the head shell 12, and then if the spool 11 rotates relative to the head shell 12, the grass mowing rope 100 can be wound on the spool 11. Wherein the alignment of the inner threading hole 112 and the outer threading hole 121 may also be automatically aligned by the structural cooperation between the head housing 12 and the spool 11. The fan assembly 13 radiates heat to the lawnmower 1 when rotating about the central axis 10 a.

Looking at the grass-mowing head 10 in the direction of arrow a in fig. 1, in a normal situation, when the grass-mowing head 10 is used for mowing, the grass-mowing head 10 rotates in a first rotating direction, specifically, the grass-mowing head 10 can rotate clockwise, and when the grass-mowing cord 100 wound on the spool 11 needs to be released, the spool 11 can rotate relative to the head housing 12 in the first rotating direction, that is, the spool 11 rotates relative to the head housing 12 in the clockwise direction, and when the grass-mowing cord 100 needs to be wound on the spool 11, the spool 11 can rotate relative to the head housing 12 in a second rotating direction, that is, the spool 11 rotates relative to the head housing 12 in the counterclockwise direction, which is not limited to the rotating direction of the grass-mowing head 10 and the direction in which the spool 11 rotates relative to the head housing 12.

Specifically, the grass cutting head 10 may have a grass cutting mode, a line releasing mode, and a line winding mode. The bobbin 11 has first engaging teeth 113 formed on an upper portion thereof, second engaging teeth 114 formed on a lower portion thereof, and the head housing 12 is formed with first mating teeth 125 mating with the first engaging teeth 113 and second mating teeth 126 mating with the second engaging teeth 114. The head housing 12 and the bobbin 11 also constitute an articulated connection in a direction parallel to the central axis 10 a. The first engaging teeth 113 and the first mating teeth 125 are engaged with each other when the head housing 12 is located at a first axial position with respect to the spool 11, and the second engaging teeth 114 and the second mating teeth 126 are engaged when the head housing 12 is located at a second axial position with respect to the spool 11. The head shell 12 is further connected with a knocking cap 127, the knocking cap 127 and the head shell 12 form a rotary connection, and the knocking cap 127 and the head shell 12 are relatively fixed on the shaft. A spring 14 is also disposed between the spool 11 and the head housing 12, and the spring 14 is biasedly disposed between the spool 11 and the head housing 12 and causes the head housing 12 to be in a first axial position relative to the spool 11 in which the first engagement teeth 113 and the first mating teeth 125 are engaged with each other. When the lawnmower 1 strikes the ground, the ground drives the entire body of the striking cap 127 and the head housing 12 to move toward the second axial position with respect to the spool 11 against the bias of the spring 14, the second engaging teeth 114 and the second engaging teeth 126 engage with each other when the head housing 12 moves to the second axial position, and the first engaging teeth 113 disengage from the first engaging teeth 125 and the second engaging teeth 114 disengage from the second engaging teeth 126 during the movement of the head housing 12 from the first axial position toward the second axial position. Wherein the first engaging teeth 113 and the first mating teeth 125 are both bevel teeth, so that the head housing 12 allows the spool 11 to rotate counterclockwise with respect to the head housing 12.

Therefore, when the grass cutting head 10 is in the grass cutting mode, the driving shaft 101a drives the spool 11 to rotate along the first rotation direction, at this time, the head housing 12 is located at the first axial position relative to the spool 11, the first engaging teeth 113 and the first engaging teeth 125 are engaged with each other, so that the spool 11 rotating along the first rotation direction will drive the head housing 12 to rotate along the first rotation direction, and then the grass cutting head 10 rotates to drive the grass cutting cord 100 to cut grass. When the grass trimmer 1 strikes the ground, the head shell 12 moves from the first axial position to the second axial position relative to the spool 11, and during the process that the head shell 12 moves from the first axial position to the second axial position relative to the spool 11, the first engaging teeth 113 are disengaged from the first engaging teeth 125, and the second engaging teeth 114 are also disengaged from the second engaging teeth 126, so that the spool 11 will move relative to the head shell 12 along the first rotating direction, and the grass mowing cord 100 wound on the spool 11 is released, and the grass mowing head 10 is in a line releasing mode. When the grass cutting head 10 is in the winding mode, the spool 11 can rotate relative to the head housing 12 in a second rotation direction, so that the grass cutting rope 100 is wound on the spool 11. In the present embodiment, the grass-mowing head 10 realizes the line laying by striking the ground, but it is understood that in other embodiments, other driving manners can be adopted to drive the grass-mowing head 10 to realize the line laying, such as accelerating the driving of the spool 11 by a motor to cause the spool 11 to move relative to the head shell 12.

In the present embodiment, the grass-mowing head 10 further comprises a driving device 15 for driving the spool 11 to rotate relative to the head shell 12 so as to enable the grass-mowing head 10 to be in the winding mode, the driving device 15 is connected with the head shell 12 or the spool 11, and the driving device 15 is a mechanical driving device. The driving device 15 may include a driving member disposed in the accommodating space 12a surrounded by the head housing 12, and the driving member may further be an energy storage element, which may be specifically the elastic element 14, and further the coil spring 151. In the present embodiment, the driving device 15 can be considered as a part of the grass-mowing head 10, and the grass-mowing head 10 can be detached from the grass mower 1 by the user, so that the grass-mowing head 10 can automatically wind the grass-mowing rope 100 on the spool 11 under the driving of the driving device 15 when not connected with the motor, and the grass-mowing head 10 is in the winding mode. In this way, the grass mowing cord 100 is wound without depending on a motor, so that the internal structure of the grass mowing head 10 can be simplified, and the stability of winding is improved. Moreover, the grass-mowing head 10 is small in size, so that a user can conveniently wind the grass mowing cord 100 on the spool 11, and the user can conveniently hold the grass-mowing head 10 to automatically wind the grass mowing cord 100 on the spool 11.

Specifically, in the present embodiment, the coil spring 151 is provided inside the head housing 12. The coil spring 151 may be centered on the central axis 10a, and the coil spring 151 may also be disposed on one side of the central axis 10 a. In the present embodiment, the coil spring 151 is wound between the spool 11 and the head housing 12, and the first end 151a of the coil spring 151 may be fixedly connected to the spool 11 and the second end 151b may be fixedly connected to the head housing 12.

When the grass trimmer head 10 is in the cutting mode, the spool 11 carries the head housing 12 together with it to rotate in the first rotational direction, and the coil spring 151 also rotates together with the head housing 12 and the spool 11, that is, the coil spring 151 is stationary with respect to the head housing 12 or the spool 11. When the grass mowing head 10 is in the line releasing mode, the spool 11 rotates relative to the head shell 12 in the first rotating direction, and the first end 151a connected with the spool 11 is also driven along with the spool 11, so that the first end 151a moves relative to the second end 151b, and the number of turns of the coil spring 151 wound on the spool 11 is increased, so that the coil spring 151 stores certain energy, which is further elastic potential energy. When the user needs to wind the grass mowing cord 100 on the spool 11, the user can enable the grass mowing cord 100 to pass through the outer threading hole 121 and the inner threading hole 112, at the moment, the stored elastic potential energy of the coil spring 151 tends to drive the spool 11 to rotate in the second rotating direction relative to the head shell 12, at the moment, the coil spring 151 releases the stored energy, and the spool 11 is driven by the first end 151a of the coil spring 151 to rotate in the second rotating direction, so that the grass mowing cord 100 is wound on the spool 11. In addition, when the grass cutting head 10 is detached from the grass cutting head 10, if enough elastic energy is not stored in the coil spring 151 at this time, the user can manually operate the spool 11 to relatively rotate in the first rotating direction relative to the head shell 12, and then the coil spring 151 is enabled to store energy, so that the grass cutting rope 100 can be automatically wound on the spool 11, the operation of the user is further facilitated, and the user can wind the grass cutting rope 100 on the spool 11 even if the grass cutting head 10 is used alone or the grass cutting machine 1 is powered off. It will be appreciated that winding the cord 100 onto the spool 11 may also be accomplished by varying the manner in which the coil springs 151 are connected and the manner in which the motor drives the rotation of the grass cutting head 10, and in fact, the drive rotary drive head housing 12. In the present embodiment, the bobbin 11 is connected to the coil spring 151 and can drive the coil spring 151 to store energy, and therefore, the bobbin 11 can be regarded as an energy transfer element which can transfer other energy to the energy storage element and drive the energy storage element to store energy

In the present embodiment, it can be understood that the grass-mowing head 10 can be further provided with a limiting device for limiting the energy released by the coil spring 151. When the user releases the restriction of the coil spring 151 by the restriction means, the coil spring 151 will drive the spool 11 to rotate counterclockwise so as to wind the mowing cord 100 onto the spool 11.

In the embodiment, when the grass mowing head 10 pays off the line, the coil spring 151 stores energy, and a device for storing energy for the coil spring 151 is not needed, so that the cost is saved, the grass mowing head 10 is simple in structure, and the coil spring 151 is wound between the spool 11 and the head shell 12, so that the size of the grass mowing head 10 is reduced. More importantly, when the coil spring 151 stores energy, when the wire winding is needed, the user can firstly detach the grass mowing head 10 from the grass mowing machine 1, so that the user can greatly facilitate the operation that the grass mowing rope 100 penetrates through the grass mowing head 10, the grass mowing head 10 can be adapted to grass mowing heads 10 with different functions and specifications, and the wire winding modes of the grass mowing heads 10 do not depend on the grass mowing machine 1.

Fig. 7 shows a grass cutting head 20 of a second embodiment of a grass cutting machine having the same prime mover, operating means and energy means as in the first embodiment. As shown in fig. 7 to 13, the grass-mowing head 20 may have a spool 21, a head housing 22 and a fan assembly 23 of substantially the same structure as the first embodiment. In this embodiment, the grass trimmer further comprises a driving device 25 which is different from the first embodiment in structure and is used for driving the grass trimmer head 20 to be in the winding mode. The configuration of the head housing 22 and the spool 21 may also be adapted to accommodate the configuration of the drive device 25. All the parts of the first embodiment that are suitable for this embodiment can be applied to this embodiment, and the differences between this embodiment and the first embodiment will be mainly described below.

In the present embodiment, the driving device 25 includes an energy storage element and an energy transfer element. Wherein the energy storage element is capable of storing energy for driving the spool 21 to rotate in the second rotational direction relative to the head housing 22, and in this embodiment, the energy storage element is embodied as a coil spring 251, and the coil spring 251 is disposed in the accommodating space 22a surrounded by the head housing 22. The energy transfer element can convert other energy into energy that can be stored by the energy storage element, or the energy transfer element can transfer other energy to the energy storage element and drive the energy storage element to store energy, and specifically, the energy transfer element is a rotating member 252 disposed in the accommodating space 22 a.

The coil spring 251 includes a first end 251a connected to the rotational member 252 and a second end 251b connected to the head case 22. The rotating member 252 can move in a first rotational direction with respect to the spool 21 about the central axis 20a, and when the rotating member 252 rotates in a second rotational direction about the central axis 20a, the spool 21 rotates synchronously with the rotating member 252. Thus, when the rotating member 252 rotates in the first rotating direction relative to the spool 21, the rotating member 252 drives the first end 251a of the coil spring 251 to rotate synchronously, so that the coil spring 251 stores a certain amount of energy. When the coil spring 251 releases the stored energy, the first end 251a of the coil spring 251 rotates the rotating member 252 in the second rotating direction, and the rotating member 252 further rotates the spool 21 in the second rotating direction, and if the head housing 22 is fixed, the spool 21 rotates relative to the head housing 22 in the second rotating direction, so as to wind the mowing cord 200 on the spool 21. Of course, it is understood that the winding of the mowing cord 200 onto the spool 21 can also be realized by driving the head housing 22 to rotate, again by changing the connection manner of the coil spring 251 and the rotating member 252.

In order to enable the rotating member 252 to rotate in the first rotating direction relative to the spool 21, an engaging portion for engaging with the grass mowing cord 200 is formed on the rotating member 252, and the engaging portion may be an engaging tooth 252 a. When it is necessary to wind a grass mowing cord 200 on the spool 21, the user can firstly pass the grass mowing cord 200 through the outer threading hole 221 and the inner threading hole 212 in sequence, and then pull the grass mowing cord 200 through one end of the grass mowing head 20 so that the lengths of the grass mowing cord 200 distributed on the two sides of the grass mowing head 20 are basically the same. When the grass mowing cord 200 is wound around the two inner threading holes 212 of the spool 21, the grass mowing cord 200 will contact the matching teeth 252a, when a user pulls the grass mowing cord 200, the acting force between the grass mowing cord 200 and the matching teeth 252a will drive the rotating member 252 to rotate in the first rotating direction, so that the rotating member 252 will drive the first end 251a of the coil spring 251 to rotate, the spool 21 is basically static, the coil spring 251 starts to store energy, when the grass mowing cord 200 is pulled to the same length distributed on the two sides of the grass mowing head 20, the user stops pulling the grass mowing cord 200, the coil spring 251 starts to release energy, the first end 251a of the coil spring 251 drives the rotating member 252 to rotate, the rotating member 252 drives the spool 21 to rotate in the second rotating direction relative to the head shell 22, and the rotating spool 21 automatically winds the grass mowing cord 200 onto the spool 21. In other embodiments, the engaging portion may also be a friction portion with a relatively high friction coefficient, and the rotating member 252 is rotated by the friction force generated by the grass mowing cord 200 and the friction portion to drive the coil spring 251 to store energy.

In the present embodiment, the driving device 25 further includes a locking component for locking the rotation of the rotating component 252 in the second rotation direction relative to the spool 21 by the user, and the locking component is specifically a locking pin 253 arranged between the rotating component 252 and the spool 21. The locking assembly allows the rotational member 252 to rotate in a first rotational direction relative to the spool 21 and prevents the rotational member 252 from rotating in a second rotational direction relative to the spool 21. Specifically, the bobbin 21 is formed with a circular inner wall surface 215, the rotor 252 is formed with an outer wall surface including a plurality of arc surfaces 252b centered on the central axis 20a and a plurality of stopper surfaces 252c extending in a plane, the arc surfaces 252b and the stopper surfaces 252c are sequentially provided at intervals, and the lock pin 253 is provided between the inner wall surface 215 and the stopper surfaces 252 c. The number of the stop surfaces 252c is 5, and the number of the arc surfaces 252b is 5. The stop surface 252c includes a first stop end 252d and a second stop end 252e respectively connecting two adjacent circular arc surfaces 252b, and the first stop end 252d is disposed at a front side of the second stop end 252e in the first rotation direction. The minimum distance between first stop end 252d and inner wall surface 215 is greater than the minimum distance between second stop end 252e and inner wall surface 215. On a first radial line passing through first stop end 252d and central axis 20a, the distance between the intersection of first stop end 252d and the first radial line closer to first stop end 252d and first stop end 252d may be considered to be the minimum distance between first stop end 252d and inner wall surface 215. And on a second radial line passing through second stop end 252e and central axis 20a, the distance between the second stop end 252e and the intersection of the second radial line and the second stop end 252e that is closer to second stop end 252e and second stop end 252e may be considered to be the minimum distance between second stop end 252e and inner wall surface 215. Thus, when the rotating member 252 rotates in the first rotating direction relative to the spool 21, the locking pin 253 is disposed adjacent to the second locking end 252e, and the locking surface 252c will push the pin to rotate together. When the rotating member 252 rotates in the second rotating direction relative to the spool 21, the locking pin 253 is disposed near the first locking end 252d and is caught between the inner wall surface 215 and the locking surface 252c, so that the spool 21 rotates in the second rotating direction together with the rotating member 252.

Of course, it will be appreciated that in other embodiments, the locking assembly may take on other configurations that allow only unidirectional rotation of the rotational member 252 relative to the spool 21, such as a unidirectional bearing, a shaft lock, etc.

Likewise, in the present embodiment, the driving device 25 drives the grass-mowing head 20 in the winding mode without depending on the motor, which enables the grass-mowing head 20 to achieve automatic winding of the grass-mowing cord 200 onto the spool 21 even when not connected to the motor.

Fig. 14 shows a grass cutting head 30 of a grass cutting machine of a third embodiment, which has the same prime mover, operating means and energy means as the first embodiment. As shown in fig. 14 to 18, the grass-mowing head 30 may have a spool 31, a head housing 32 and a fan assembly 33 of substantially the same structure as the first embodiment. In this embodiment, the grass trimmer further comprises a driving device 35 which is different from the first embodiment in structure and is used for driving the grass-mowing head 30 to be in the winding mode. The configuration of the head housing 32 and the spool 31 may also be adapted to accommodate the configuration of the drive device 35. All the parts of the first embodiment that are suitable for this embodiment can be applied to this embodiment, and the differences between this embodiment and the first embodiment will be mainly described below.

In the present embodiment, the driving device 35 comprises an energy storage element and an energy transfer element. Wherein the energy storage element, embodied in this embodiment as a coil spring 351, is capable of storing energy for driving the rotation of the spool 31 relative to the head housing 32 in the second rotational direction. The energy transfer element can convert other energy into a form that can be stored by the energy storage element, or the energy transfer element can transfer other energy to the energy storage element, and specifically, the energy transfer element is a rotating member 352 disposed within the receiving space 32 a.

Specifically, the coil spring 351 includes a first end 351a connected to the rotation member 352 and a second end 351b connected to the head case 32. The spool 31 is connected or formed with a rotation shaft portion 316, the rotation member 352 is formed with a first transmission portion 352a, and the rotation shaft portion 316 is formed with a second transmission portion 316a engaged with the first transmission portion. The rotation member 352 can generate a relative movement in the direction of the central axis 30a with respect to the rotation shaft portion 316, so that the rotation member 352 can be positioned with respect to the spool 31 in a position where the first transmission portion 352a and the second transmission portion 316a are engaged with each other to allow the rotation shaft portion 316 to rotate in synchronism with the rotation member 352, and the rotation member 352 can also be positioned with respect to the spool 31 in a position where the first transmission portion 352a is disengaged from the second transmission portion 316a to allow the rotation member 352 to rotate with respect to the rotation shaft portion 316.

The driving device 35 further includes a driving member 353 and an operating member 354, the operating member 354 is used for being operated by a user, and the driving member 353 can drive the rotating member 352 to rotate. The operating member 354 is a toggle movably connected to the fan assembly 33, the operating member 354 can rotate to a first position and a second position relative to the fan assembly 33, when the operating member 354 is located at the first position, a user cannot press the operating member 354, and when the operating member 354 is located at the second position, the user can press the operating member 354. The driving member 353 is connected to the operating member 354, the driving member 353 is formed with a first transmission tooth 353a, the rotating member 352 is formed with a second transmission tooth 352b, the first transmission tooth 353a and the second transmission tooth 352b are engaged with each other, and when the driving member 353 rotates in the first rotation direction, the first transmission tooth 353a drives the rotating member 352 to rotate together with the driving member 353. The driving device 35 further includes a limiting member 355, and when the operating member 354 is located at the second position, the limiting member 355 limits the rotating member 352 from rotating in the second rotating direction. Thus, when the driving member 353 is driven by the operating member 354 to move forward, the first transmission tooth 353a drives the rotating member 352 to rotate, and when the driving member 353 moves backward, the rotating member 352 is not limited by the limiting member 355 to rotate in the second rotating direction. When the operating member 354 is located at the first position, the limiting member 355 is also moved to a position allowing the rotating member 352 to rotate. Thus, when winding is required, the rotating member 352 moves to a position where the rotating member 352 is disengaged from the rotating shaft portion 316 of the spool 31, so that the operating member 354 moves to the second position and presses the operating member 354, and when the operating member 354 is repeatedly pressed, the driving member 353 drives the rotating member 352 to rotate along the first rotating direction, and the rotation of the rotating member 352 also drives the first end 351a of the coil spring 351 to rotate together, so that the coil spring 351 is charged with energy, and then the grass mowing cord 300 passes through the grass mowing head 30, so that the rotating member 352 moves to a position where the rotating shaft portion 316 is engaged with the coil spring 351 to release elastic potential energy, and at this time, the spool 31 rotates synchronously with the rotating member 352, so that the grass mowing cord 300 is automatically wound on the spool 31.

It will be appreciated that in this embodiment, the driving device 35 is configured to automatically wind the grass mowing cord 300 on the spool 31 by driving the spool 31 to rotate, and in fact, in other embodiments, the driving device 35 may be configured to drive the head housing 32 to rotate by matching the internal components of the driving device 35 with the spool 31 and the head housing 32.

Likewise, in the present embodiment, the driving device 35 drives the grass-mowing head 30 in the winding mode without depending on the motor, which enables the grass-mowing head 30 to achieve automatic winding of the grass cord 300 onto the spool 31 even when not connected to the motor.

Fig. 19 shows a grass cutting head 40 of a grass cutting machine according to a fourth embodiment, which has the same prime mover, operating means and energy means as in the first embodiment. As shown in fig. 19 to 21, the grass-mowing head 40 may have a spool 41, a head housing 42 and a fan assembly 43 of substantially the same structure as the first embodiment. In this embodiment, the grass trimmer further comprises a driving device 45 which is different from the first embodiment in structure and is used for driving the grass-mowing head 40 to be in the winding mode. The configuration of the head housing 42 and the spool 41 may also be adapted to accommodate the configuration of the drive device 45. All the parts of the first embodiment that are suitable for this embodiment can be applied to this embodiment, and the differences between this embodiment and the first embodiment will be mainly described below.

In the present embodiment, the driving device 45 includes an operating member 451 and a transmission assembly 452, the operating member 451 is movably connected with the head housing 42 for operation by a user, and the transmission assembly 452 is used for transmitting power between the operating member 451 and the spool 41. The operating member 451 is specifically movable in a first motion relative to the head housing 42, and the transmission member 452 drives the spool 41 in a second motion relative to the head housing 42. In the present embodiment, the operating member 451 may be specifically formed by the fan assembly 43, and the transmission assembly 452 includes an internal gear ring 452a that rotates in synchronization with the operating member 451, and the operating member 451 is disposed around the internal gear ring 452 a. A rotating shaft portion 416 is formed or connected to the spool 41, the rotating shaft portion 416 has the central axis 40a as an axis, the ring gear 452a also has the central axis 40a as an axis, and an intermediate gear 452b that meshes with the ring gear 452a and the rotating shaft portion 416 is further provided between the ring gear 452a and the rotating shaft portion 416. Thus, when the operating element 451 is turned by the user, the intermediate gear 452b drives the whole of the rotational shaft portion 416 and the spool 41 about the central axis 40 a. When the operating element 451 is rotated by a user for N turns, the bobbin 41 rotates for M turns, wherein a ratio of M to N is greater than 1 and less than or equal to 10, and further, a ratio of M to N is greater than or equal to 5 and less than or equal to 10. Thus, when the user needs to wind the grass mowing rope 400, the user only needs to rotate the operating element 451 for a few turns, namely, the spool 41 can rotate for more turns, so that the grass mowing rope 400 can be wound on the spool 41 quickly, the user does not feel tired, and the operation of the user is facilitated. That is, in the present embodiment, the first movement form of the operating member 451 with respect to the head housing 42 is such that the operating member 451 is rotatable with respect to the head housing 42, and the movement of the spool 41 with respect to the head housing 42 is such that the spool 41 is rotatable with respect to the head housing 42, but the speed at which the operating member 451 is rotatable with respect to the head housing 42 and the speed at which the spool 41 is rotatable with respect to the head housing 42 are different, so that the first movement form and the second movement form are also different.

In this embodiment, the driving device 45 drives the grass cutting head 40 in the winding mode and is not dependent on a motor, which enables the grass cutting head 40 to wind the grass cutting cord 400 onto the spool 41 when detached from the grass trimmer.

Fig. 22 shows a grass cutting head 50 of a grass cutting machine according to a fifth embodiment, which has the same prime mover, operating means and energy means as in the first embodiment. As shown in fig. 22 and 23, the grass cutting head 50 may have a spool 51, a head housing 52, and a fan assembly 53 of substantially the same construction as the first embodiment. In this embodiment, the grass trimmer further comprises a driving device 55 for driving the grass-mowing head 50 to be in the winding mode, which is different from the first embodiment in structure. The configuration of the head housing 52 and the spool 51 may also be adapted to accommodate the configuration of the drive device 55. All the parts of the first embodiment that are suitable for this embodiment can be applied to this embodiment, and the differences between this embodiment and the first embodiment will be mainly described below.

In the present embodiment, the driving device 55 includes an energy storage element capable of storing energy for driving the bobbin 51 to rotate in the second rotational direction with respect to the head housing 52, and the energy storage element is a coil spring 551 provided in the accommodating space 52a surrounded by the head housing 52.

Specifically, the coil spring 551 is wound to be disposed in the accommodating space 52 a. The drive device 55 further includes: an operating member 552, a transmission member 553 and a connecting wire 554. The operating member 552 is movably coupled to the head housing 52 for user operation. Transmission member 553 is used to transmit power between coil spring 551 and spool 51, coil spring 551 is connected to transmission member 553, and operating member 552 is connected to transmission member 553 through connecting wire 554. The connecting wire 554 is wound onto the transmission member 553. When the user pulls the operation member 552, the connection line 554 drives the transmission member 553 to rotate, and the rotating transmission member 553 drives the coil spring 551 to accumulate energy. The transmission 553 can thus be regarded as an energy transfer element which is able to transfer further energy to the energy storage element and to drive the energy storage element for energy storage. That is, the user energizes the coil spring 551 by operating the operating member 552. When the user releases the operating member 552, the coil spring 551 releases the stored energy and drives the transmission member 553 to rotate, and the rotating transmission member 553 drives the spool 51 to rotate, thereby winding the mowing cord on the spool 51. Wherein grass-mowing head 50 further comprises a pressure plate 555 capable of driving transmission member 553 to move into and out of engagement with spool 51. The transmission member 553 forms a transmission portion, and the bobbin 51 is formed with a fitting portion that can be fitted with the transmission portion, specifically, the transmission portion is a protrusion, and the fitting portion is a groove that can be fitted by the protrusion.

In fact, in the present embodiment, the whole of the coil spring 551, the transmission member 553 and the connecting wire 554 can also be regarded as a transmission assembly for achieving power transmission between the operating member 552 and the spool 51. Wherein the operation member 552 and the head housing 52 constitute a movement in a first movement form in which the operation member 552 is slidable with respect to the head housing 52. The transmission assembly can drive the movement of the spool 51 relative to the head housing 52 in a second form of movement in which the spool 51 can rotate relative to the head housing 52.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.

Claims (10)

1. A grass-mowing head comprising:

a spool including a winding portion for winding a grass cutting cord;

a head housing formed around a receiving space for receiving at least a portion of the bobbin;

a driving device for driving at least one of the spool and the head housing to generate relative rotation between the spool and the head housing to wind the grass cutting rope onto the spool;

Wherein the driving device includes:

an energy storage element to drive at least one of the bobbin and the head housing to cause relative rotation of the bobbin and the head housing upon release of the stored energy.

2. Grass-mowing head according to claim 1, characterized in that:

the energy storage element is at least partially disposed within the receiving space.

3. Grass-mowing head according to claim 1, characterized in that:

the energy storage element is an elastic element.

4. Grass-mowing head according to claim 1, characterized in that:

the energy storage element is a coil spring, and one end of the coil spring is connected with the bobbin.

5. Grass-mowing head according to claim 1, characterized in that:

the driving device further includes:

and the energy transfer element is used for transferring other energy to the energy storage element and driving the energy storage element to store energy.

6. Grass-mowing head according to claim 1, characterized in that:

the grass mowing head further comprises an operating piece connected to the head shell or the spool and used for being operated by a user; when a user operates the operating piece, the energy storage element stores energy.

7. Grass-mowing head according to claim 1, characterized in that:

The grass mowing head further comprises an operating piece connected to the head shell or the spool and used for being operated by a user; when the user operates the operating member, the energy storage element releases the stored energy.

8. Grass-mowing head according to claim 1, characterized in that:

the grass mowing head further comprises a limiting device used for limiting the energy storage element to release energy.

9. A lawnmower comprising:

the grass mowing head is used for mowing grass;

the prime motor is used for driving the grass mowing head to rotate around the central axis;

the grass cutting head includes:

a spool including a winding portion for winding a grass cutting cord;

a head housing formed around a receiving space for receiving at least a portion of the bobbin;

a driving device for driving at least one of the spool and the head housing to generate relative rotation between the spool and the head housing to wind the grass cutting rope onto the spool;

wherein the driving device includes:

an energy storage element to drive at least one of the bobbin and the head housing to cause relative rotation of the bobbin and the head housing upon release of the stored energy.

10. A lawnmower according to claim 9, wherein:

The energy storage element is a coil spring, and one end of the coil spring is connected with the bobbin.

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