CN111096140B

CN111096140B - Grass trimmer

Info

Publication number: CN111096140B
Application number: CN201910661504.0A
Authority: CN
Inventors: 郭建朋; 聂方杰
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2018-10-26
Filing date: 2019-07-22
Publication date: 2022-09-20
Anticipated expiration: 2039-07-22
Also published as: CN111096140A

Abstract

The invention discloses a grass trimmer, comprising: grass cutting head; the motor is used for driving the grass mowing head to rotate by taking the first axis as a shaft; an operating device for controlling rotation of the motor; the head of beating the grass includes: a spool for winding the mowing cord; the head shell is used for accommodating at least part of the bobbin and is connected with or formed with a wire outlet buckle; the line outgoing buckle forms a threading hole for the grass-mowing rope to penetrate in or out, and the line outgoing buckle is also connected with or formed with: the antifriction piece, at least part be located the within range of through wires hole and can directly act on the rope of beating the grass, the antifriction piece can reduce at least part and beat the acting force that the rope acted on the play line and detain that grass, and the bolster, at least part is connected to the antifriction piece and can absorb at least part and beat the acting force that the rope acted on the antifriction piece of beating the grass. This grass cutting head reduces the probability of cutting at the knot department of being qualified for the next round of competitions of beating the grass rope through optimizing spool effort distribution, and convenience of customers operates.

Description

Grass trimmer

Technical Field

The invention relates to a grass trimmer, in particular to a line outgoing buckle of the grass trimmer.

Background

The grass trimmer is used as a garden tool 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 a head shell for accommodating the spool, the grass cutting rope penetrates into or penetrates out of the grass cutting head through a line outgoing buckle which is installed or formed on the head shell, when grass cutting operation is carried out, the grass cutting rope rotates at a high speed under the driving of the grass cutting head, meanwhile, the grass cutting rope directly acts on grass trees, the grass trees can generate a large reaction force on the grass cutting rope, the reaction force acts on the line outgoing buckle through the grass cutting rope, a large interaction force can be generated between the grass cutting rope and the line outgoing buckle, when the grass cutting head encounters a large load or carries out trimming operation, the reaction force can be increased instantly, so that the grass cutting rope is cut at the line outgoing buckle. Among the prior art, for convenience of customers' operation, the head of beating grass is equipped with automatic unwrapping wire or beats structures such as unwrapping wire, but if beat the grass rope and cut in knot department of being qualified for the next round of competitions, then above-mentioned structure can become invalid basically, needs the user to unpack the head of beating grass apart this moment, draws out the rope of beating grass, just can continue the unwrapping wire, how reduces the probability that the rope of beating grass was cuting in knot department of being qualified for the next round of competitions, and it is the present technical problem who waits to solve to increase user experience.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide the grass trimmer capable of effectively preventing the grass trimming rope from breaking at the line outgoing buckle.

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

a lawnmower comprising: the grass mowing head is used for mowing grass; the motor is used for driving the grass mowing head to rotate by taking the first axis as a shaft; an operating device for controlling rotation of the motor; the head of beating the grass includes: a spool for winding the mowing cord; the head shell is used for accommodating at least part of the bobbin and is connected with or formed with a wire outlet buckle; the line-outgoing buckle forms a threading hole for the grass-mowing rope to penetrate or penetrate out, and the line-outgoing buckle is also connected with or formed with: the antifriction piece, but at least part be located the within range of through wires hole and direct action in the rope of beating the grass, antifriction piece can reduce at least part and beat the acting force that the rope acted on the play line and detain that the rope beats, and the bolster is connected to antifriction piece at least part and can absorb at least part and beat the acting force that the rope acted on the antifriction piece of beating the grass.

Further, the wear reducing member includes: the base is fixedly connected to the wire outlet buckle and forms or is provided with a rotating shaft; a rotating member connected to the rotating shaft and rotatable around the rotating shaft; the rotating member is also capable of moving in the axial direction of the rotating shaft when the rotating member is mounted to the rotating shaft.

Further, the buffer member is a spring, and the spring directly or indirectly acts on the wear reducing member.

Furthermore, the thread outlet buckle is provided with a mounting part, at least part of the mounting part is communicated with the thread hole, and the anti-friction piece is mounted in the mounting part and can freely move in the range of the mounting part.

Further, the mounting portion can limit axial displacement of the wear reduction member along the first axis.

Further, the head shell is formed with an accommodating groove, and the outgoing line buckle is installed in the accommodating groove.

Furthermore, the grass mowing head also comprises an operating part, wherein the operating part is provided with an outer transmission mechanism, the spool is provided with an inner transmission mechanism, and the outer transmission mechanism is matched with the inner transmission mechanism to realize the synchronous rotation of the operating part and the spool;

the operating element is provided with a first driving part; the head shell is provided with a second driving part, and when a user triggers the operating piece, the first driving part is matched with the second driving part to drive the spool to rotate so as to pay out the grass beating rope.

Further, the first driving portion is embodied as a set of driving teeth having a driving surface deviating from the first axial direction and one stop surface substantially along the first axial direction; the second driving portion is formed with a projection substantially in a direction perpendicular to the first axis.

Further, the operating member is connected to or formed with a contact member for the grass-mowing head to directly contact the contact surface.

Further, the grass mowing head further comprises a biasing element, the operating member is biased to the spool by the biasing element when the operating member is triggered by a user, and the operating member can be reset under the action of the biasing element when the user disengages from the operating member.

The invention has the advantages that: reduce the rope of beating grass through setting up antifriction spare and detaining the interact power that is located the through wires hole contact surface being qualified for the next round of competitions to further absorb the rope of beating grass and detain the interact power between the line through the bolster, thereby reduce the rope of beating grass on the whole and detain the probability of cuting in the department of being qualified for the next round of competitions, guarantee to beat the rope and can normal use, avoid the operation of tearing open the quick-witted, increase user experience.

Drawings

FIG. 1 is a perspective view of a lawnmower;

FIG. 2 is a perspective view of the grass cutting head of the lawnmower of FIG. 1;

FIG. 3 is an exploded view of the grass-mowing head of FIG. 2;

FIG. 4 is an exploded view of another angle of the grass-mowing head of FIG. 3;

FIG. 5 is a perspective view of the second housing portion of the grass cutting head of FIG. 3;

FIG. 6 is a perspective view of the operating portion of the grass-mowing head of FIG. 4;

FIG. 7 is a partial cross-sectional view of the grass-mowing head of FIG. 2;

FIG. 8 is a cross-sectional view of the grass-mowing head of FIG. 2; (ii) a

FIG. 9 is a perspective view of the second housing portion of the grass cutting head of FIG. 5;

FIG. 10 is a perspective view of the thread-out clasp of the grass-mowing head;

FIG. 11 is a perspective view from another perspective of the line outlet clasp of the grass-mowing head of FIG. 10;

FIG. 12 is a schematic view of the line outlet buckle assembly of the grass trimmer head of FIG. 8;

FIG. 13 is a schematic view of a line outlet buckle assembly of the grass trimmer head in a second embodiment;

FIG. 14 is an exploded view of the thread outlet clasp assembly of the grass mowing head of FIG. 13;

FIG. 15 is a perspective view of a grass cutting head according to a third embodiment;

FIG. 16 is a perspective view of the grass-mowing head of FIG. 15 from another perspective;

FIG. 17 is a perspective view of the outlet clasp of the grass-mowing head of FIG. 15;

FIG. 18 is a perspective view of the outlet clasp of the grass-mowing head of FIG. 17 from another perspective;

FIG. 19 is an exploded view of the outlet clasp of the grass-mowing head of FIG. 17;

FIG. 20 is an exploded view from another perspective of the outlet clasp of the grass-mowing head of FIG. 19;

FIG. 21 is a perspective view of another implementation of the outlet clasp of the grass cutting head of FIG. 17;

FIG. 22 is an exploded view of the outlet clasp of the grass-mowing head of FIG. 21.

Detailed Description

The invention is described in detail below with reference to the figures and the embodiments.

As shown in FIG. 1, the lawnmower 100 includes a grass cutting head 10, a drive device 102, and an operating device 103.

As shown in fig. 1 to 2, the driving device 102 can drive the grass mowing head 10 to rotate around the first axis 101, so that the grass mowing head 10 drives the grass mowing rope 18 to rotate to cut vegetation. The operating device 103 is used for a user to operate to control the lawn mower 100.

Specifically, the drive device 102 includes a motor and a drive shaft. Wherein the drive shaft is connected to the grass-mowing head 10 so as to drive the grass-mowing head 10 in rotation about the first axis 101.

As shown in fig. 2 to 4, the grass mowing head 10 includes a spool 11 and a head housing 12, the spool 11 is used for winding a grass mowing cord 18 and is accommodated in the head housing 12, and the spool 11 is mounted or formed with a winding portion; the head shell 12 is formed with an external threading hole 122i for the grass-mowing rope 18 to pass through, and a thread outlet buckle 151 is further arranged at the external threading hole 122 i. As one implementation, the head housing 12 includes a first housing part 121 and a second housing part 122, which facilitates the assembly of the head housing 12 with the bobbin 11 and also facilitates the user to open the head housing 12 to detect the condition inside the head housing 12; of course, in other embodiments, the head housing 12 may be a single component including one accommodating space or a component formed by connecting a plurality of housing portions, and is not limited herein.

As shown in fig. 3 to 5, in the direction of the first axis 101, the grass-mowing head 10 comprises respectively: a head housing 12, a spool 11, an operating member 13. The head housing 12 forms an accommodation space in which the spool 11 is mounted, and the operation member 13 is connected to the head housing 12 through an intermediate member 14. The motor is a drive shaft connected to the spool 11 to drive the spool 11 to rotate, and the drive shaft drives the grass-mowing head 10 to rotate around the first axis 101, that is, the spool 11 is connected to the drive device 102 to introduce the power output by the drive device 102 into the grass-mowing head 10. The operating member 13 is connected to the spool 11 and projects at least partially outside the head housing 12 for operation by a user. The grass mowing head 10 has a winding mode, a line releasing mode, a grass mowing mode and the like, in the modes, grass mowing ropes 18 all go in and out through line outgoing buckles 151 connected to the outer line threading holes 122i, and in the process that the line outgoing buckles 151 go in and out, the grass mowing ropes 18 generate large acting force with contact surfaces of the line outgoing buckles 151; when the grass mowing rope 18 is subjected to a large load or trimming operation is carried out, the grass mowing rope 18 is easy to cut off at the position of the line outgoing buckle 151, at the moment, a user can send the grass mowing rope 18 out through the cooperation of the driving part and the transmission part which are arranged in the grass mowing head 10 by continuously triggering the operating part 13, the grass mowing rope 18 is continuously released, and grass can be continuously mowed.

The first housing portion 121 includes a first surface 121a and a second surface 121b, and a first through hole 121c is formed around the first axis 101 for a driving shaft to pass through, the first through hole 121c penetrates the first surface 121a and the second surface 121b, the grass cutting head 10 further includes an axial limiting member 16 for limiting the movement of the head housing 12 relative to the driving device 102 along the rotation axis direction, and the axial limiting member 16 is installed in the first through hole 121c, so as to effectively limit the movement of the head housing 12 along the first axis 101. The first surface 121a of the first housing portion 121 is connected to or formed with a first airflow member 121d, the first airflow member 121d generates an airflow far away from the grass mowing head 10 when rotating along with the grass mowing head 10, the first airflow member 121d is specifically a fan blade, and the fan blade can prevent grass clippings from being wound on a motor shaft when rotating at a high speed, and can also dissipate heat of the motor. Further, in this embodiment or other embodiments, the fan blades may further be fixedly connected or integrally formed with an anti-winding cover (not shown) for preventing grass clippings from entering the grass-mowing head 10 and avoiding the grass-mowing head 10 from failing. The second surface 121b of the first housing part 121 is further formed with a connecting part 121e connected to the second housing part 122, in the present embodiment, the first housing part 121 and the second housing part 122 are connected by a snap, and there are 2 connecting parts 121e, it is understood that there may be a plurality of connecting parts, or the first housing part 121 may be formed with a circle of connecting parts for connection in the direction around the first axis 101. In other embodiments, the first housing part 121 and the second housing part 122 may also be integrated by other fixed connection or detachable connection manners, which is not described herein again, as long as the first housing part 121 and the second housing part 122 can be connected into an integrated body and form an accommodating space.

The second housing portion 122 of the head housing 12 includes a third face 122a and a fourth face 122b, and is formed with a second through hole 122c, through which at least part of the operation member 13 can pass, around the first axis 101, wherein the second through hole 122c penetrates the third face 122a and the fourth face 122 b. On the third surface 122a, the second housing part 122 is formed with a connection hole 122e for connecting the first housing part 121 and a first receiving groove 122d for receiving the outlet button 151; the connection holes 122e and the first receiving grooves 122d are alternately arranged, and in the present embodiment, 2 connection parts and 2 first receiving grooves 122d are respectively provided, but it is understood that a plurality of connection parts and a plurality of first receiving grooves 122d may be provided, which is not limited herein.

The operating member 13 is configured to rotate synchronously with the spool 11, the spool 11 is fixed in position relative to the first housing in a direction along the first axis 101, and the operating member 13 is further configured to slidably couple with the spool 11 in a direction along the first axis 101 or parallel to the first axis 101. The operation member 13 is at least partially located outside the head housing 12, the operation member 13 partially extends into the accommodating space from outside the accommodating space along the first axis 101 through the second through hole 122c, and the operation member 13 can also close at least part of the second through hole 122 c. The portion of the operating member 13 outside the head housing 12 is an operating portion 131 for operation by the user. When the user rotates the operating part 131, the operating part 13 can drive the spool 11 to rotate synchronously with the operating part 13. The operating portion 131 surrounds the second housing portion 122 around the first axis 101, and a gap communicating the inside and the outside of the accommodating space is formed between the operating portion 131 and the second housing portion 122, so that abrasion between the operating portion 131 and the second housing portion 122 can be avoided, and a moving stroke of the operating portion 131 sliding along the first axis 101 is provided. It will be appreciated that a dust-proof structure may also be provided at the gap in order to avoid dust entering the gap.

In the present embodiment, the operating element 13 is further connected to a contact 132, and the contact 132 is further connected to the operating portion 131 of the operating element 13. The contact member 132 is located outside the receiving space, and the contact member 132 further includes a contact surface for contacting the ground when the grass cutting head 10 performs grass cutting. The contact 132 is rotatably connected to the operating element 13 about the first axis 101. Like this, when grass mowing head 10 is mowing, grass mowing head 10 will use first axis 101 to be rotatory at a high speed as the axle, and grass mowing head 10 pivoted speed is up to thousands of revolutions per minute, and can effectively prevent the wearing and tearing of grass mowing head 10 through the contact of contact 132 with ground to grass mowing head 10's life has been improved. The contact member 132 is rotatably connected to the operating member 13 through a bearing, wherein the operating member 13 and the contact member 132 are integrally formed to close the opening formed in the second housing part 122.

As shown in fig. 6 to 7, the operating member 13 forms an outer transmission structure 133 around the first axis 101, the spool 11 forms an inner transmission structure 112, and the inner transmission structure 112 is sleeved on the outer transmission structure 133 so that the spool 11 and the operating member 13 can rotate synchronously; in addition, the operation member 13 is further formed with a first driving portion 134 around the first axis 101, the first driving portion 134 is a set of driving teeth, the driving teeth include a driving surface 134a, a stop surface 134b and a continuous surface 134c, the second housing portion 122 is further formed with a second driving portion 122f around the first axis 101 for matching with the first driving portion 134, the second driving portion 122f is located in a circle of the second receiving groove 122h formed by the second housing portion 122 around the first axis 101, the second driving portion 122f is protruded out of the plane of the groove bottom of the second receiving groove 122h, the second driving portion 122f is a set of first protruding portions, and the first protruding portions and the first driving portion 134 are located in the same circumferential range along the first axis 101, when the user operates the operation member 13 to slide along the first axis 101 relative to the head housing 12 until the first protruding portions abut against the driving surface 134a, a mutual acting force parallel to the first axis 101 exists between the driving surface 134a and the first protruding portions, this interaction simultaneously generates a component of force in a direction away from the first axis 101 which drives the spool 11 to rotate continuously about the first rotational direction during the continued sliding of the operating member 13 to the head housing 12 and the final completion of the full sliding stroke, and the mowing cord 18 wound around the spool 11 is partially paid out during the rotation of the spool 11 due to the inherent stiffness of the mowing cord 18. A biasing element 17 is also provided between the operating member 13 and the spool 11 for resetting, it being understood that the resilient force of the biasing element 17 is overcome during the sliding of the operating member 13 towards the head housing 12 in the direction of the first axis 101 when the user triggers the operating member 13, and the operating member 13 is reset by the biasing element 17 when the operating member 13 is moved away from the trigger surface.

More specifically, in the present embodiment, the number of drive teeth and the number of first projections are respectively provided in 6, and the drive teeth and the first projections are arranged alternately in a direction parallel to the first axis 101 so that the first projections are in contact with the first drive surface for the maximum time, and the spool 11 can be rotated by about 30 ° in the first rotational direction during one cycle of movement in which the operating member 13 slides toward the head housing 12 and is away from the head housing 12 by the biasing member 17.

The grass-mowing head 10 further comprises an intermediate piece 14 for effecting transmission of motive torque between the spool 11 and the head housing 12. The intermediate piece 14 is configured to rotate synchronously with the spool 11, and the intermediate piece 14 is configured to be slidably connected with the spool 11 in the direction along the first axis 101. In the present embodiment, the intermediate member 14 is fixedly connected to the operating member 13 by a screw, and the whole of the intermediate member 14 and the operating member 13 rotates synchronously with the spool 11, and the whole can slide relative to the spool 11 along the first axis 101. It will be appreciated that in other embodiments the intermediate member 14 may be formed integrally with the operating member 13. It is to be understood that the number of parts for effecting torque transmission between the spool 11 and the head housing 12 is not limited to one, and may be plural, and in this case, the intermediate member 14 may be understood as one of plural parts.

In order to optimize the stress distribution at the outer threading hole 122i and avoid the grass cutting rope 18 from being cut off at the outer threading hole 122i due to the overlarge local stress at the outer threading hole 122i when the grass cutting head 10 is subjected to a large load or trimming operation, the wire outlet buckle assembly 15 shown in fig. 8 is further arranged. In this embodiment, the line outgoing buckle assembly 15 is movably mounted on the head shell 12, specifically, the head shell 12 is formed with a movable portion for the line outgoing buckle 151 to move along the circumferential direction of the head shell 12, in this embodiment, the movable portion is specifically the first accommodating groove 122, the line outgoing buckle 151 forms a line passing hole for the grass mowing rope 18 to penetrate or pass through, and when the grass mowing rope acts on the line passing hole, the line outgoing buckle 151 can displace relative to the head shell 12.

As shown in fig. 8 to 9, the thread outlet buckle 151 is movably mounted to the first receiving groove 122, the first receiving groove 122 is circumferentially formed with a guide rail 123 for allowing the thread outlet buckle 151 to slide, and a stopper 124 for preventing the thread outlet buckle 151 from sliding out of the outer threading hole 122i is further formed, it can be understood that the thread outlet buckle 151 is mounted to the first receiving groove 122 along the first axis 101 direction during assembly, the thread outlet buckle 151 can only freely slide in the circumferential direction under an acting force generated when the grass cord rotates at a high speed, and due to the stopper 124, the thread outlet buckle 151 cannot slide out of the outer threading hole 122i when sliding in the circumferential direction of the head housing 12.

As shown in fig. 10 to 11, for convenience of explaining the technical solution of the present invention, directions indicated by arrows in the drawings are defined as follows: upper side, lower side, left side, right side, front side, and back side. In the left-right direction, the outlet buckle 151 is formed with the second connecting portion 151d, the second connecting portion 151d may be provided with 1 or 2, in this embodiment, the second connecting portion 151d is provided with 2, specifically, the second connecting portion 151d may be embedded in the guide rail 123 in the head shell 12, it can be understood that in other embodiments, the second connecting portion 151d may also adopt other movable connection modes capable of generating relative movement, and details are not described here.

In the front and back direction, the outlet buckle 151 is also provided with a first threading hole 151e penetrating through the outlet buckle, the first threading hole 151e gradually expands from the back side to the front side, the curved surface in the hole is continuous and smooth, the friction between the grass mowing rope 18 and the hole wall can be reduced, and the probability that the grass mowing rope 18 is cut off at the outlet buckle 151 is reduced. It can be understood that when the grass cutting head 10 rotates in the first rotation direction for grass cutting, the grass cutting rope 18 tends to rotate in the second rotation direction due to the reaction force of the grass and the wood, and in actual operation, the grass cutting rope 18 basically acts on the right side of the line outlet, so that the grass cutting rope 18 has a larger acting force relative to the right side of the line outlet 151, and therefore, when the grass cutting rope 18 acts on the threading hole, the line outlet 151 can displace relative to the head shell 12.

As shown in fig. 8 or fig. 12, in the present embodiment, the thread-out buckle assembly 15 further includes a buffer 153 connected to one end of the thread-out buckle 151, when the grass mowing cord 18 acts on the thread-out buckle 151, the thread-out buckle 151 can bias the buffer 153 and move relative to the circumferential direction of the head shell 12, and at this time, the acting force of the grass mowing cord 18 on the thread-out buckle 151 is at least partially transferred to the buffer 153, so as to reduce the acting force between the grass mowing cord 18 and the thread-out buckle 151.

Fig. 13 shows a wire outlet buckle assembly 15 in a second embodiment, in this embodiment, the wire outlet buckle assembly 15 further includes: the wear-reducing member 152, wherein the outlet buckle 151 includes a first main body 151a and a second main body 151b, the first main body 151a and the second main body 151b are fixedly connected into a whole by bonding or other connection methods, and an installation portion 151c for installing the wear-reducing member 152 is formed on the first main body 151a and the second main body 151b, it can be understood that the first main body 151a and the second main body 151b are provided to facilitate installation of the wear-reducing member 152, of course, the wear-reducing member 152 can also be installed on the outlet buckle 151 by other methods, for example, the wear-reducing member 152 is directly placed in a mold during injection molding of the outlet buckle 151, so that the integral injection molding of the outlet buckle 151 and the wear-reducing member 152 is realized, or the outlet buckle 151 forms a through hole for installing the wear-reducing member 152, and all that the wear-reducing member 152 can be fixedly installed in the outlet buckle 151 and can directly act on the grass mowing rope 18.

It can be understood that in actual operation, the grass mowing rope 18 basically acts on the right side of the outlet, so that the grass mowing rope 18 has a larger acting force relative to the right side of the outlet buckle 151, the acting force can accelerate the abrasion of the grass mowing rope 18 at the position so as to reduce the strength of the grass mowing rope 18 at the position of the outlet buckle 151, and further the grass mowing rope 18 is cut off at the position of the outlet buckle 151 due to overlarge local stress when a large load is encountered or trimming operation is carried out; a wear reducing member 152 is provided at a right position. In the present embodiment, the wear reducing member 152 includes: a base 152a and a first rotating member 152 b. As shown in fig. 14, the first rotating member 152b is mounted to the base 152a and can rotate around the first central direction 104 relative to the base 152a, so that the sliding friction or static friction of the grass mowing cord 18 relative to the wall of the hole on the right side of the hole becomes rolling friction, and the friction acting force between the grass mowing cord 18 and the first threading hole 151e is effectively reduced. Specifically, the first rotating member 152b is mounted on a base 152a formed with or mounted with a first rotating shaft 152c, wherein the mounting portion 151c is at least partially communicated with the first threading hole 151e, and is freely movable in the left and right directions as shown in the drawing within the range of the mounting portion 151c when the base 152a is mounted to the mounting portion 151 c. At the time of assembly, the base 152a is in contact with the cushion member 153, and there is a biasing force, i.e., in the left-right direction, the cushion member 153 directly or indirectly biases the base 152a so that the base 152a abuts against the left side of the mounting portion 151 c. The first rotating member 152b may be a bearing, which is sleeved on the first rotating shaft 152c so as to be freely rotatable around the first rotating shaft 152 c; in addition, when first rotating member 152b cover was established to first rotating shaft 152c, can also follow first rotating shaft 152 c's axial motion, thereby make the acting force that beats the grass rope 18 and act on first rotating member 152b great and produce and rock from top to bottom the time, beat the grass rope 18 and can drive first rotating member 152b and reciprocate, thereby can keep beating the rolling friction between grass rope 18 and the first rotating member 152b, avoid producing secondary sliding friction or stiction because of beating the relative first rotating member 152 b's of grass rope 18 from top to bottom rocking, thereby the wearing and tearing are beaten grass rope 18. It can be understood that the first rotating member 152b can move synchronously with the base 152a under the action of the buffer member 153 when being mounted to the base 152 a.

The buffering member 153 is disposed at the right side of the outlet buckle 151 and located in the first receiving groove 122d of the head shell 12, it can be understood that the buffering member 153 may be fixedly connected with the wear reducing member 152, detachably connected with the wear reducing member 152, or only located in the first receiving groove 122d and contacting with the wear reducing member 152, in this embodiment, the buffering member 153 is a spring, it can be understood that in other embodiments, the buffering member 153 may also be other elastic members such as: when the magnetic member, the air bag, the sponge and the like are arranged in opposite directions with the same polarity, the friction reducing member 152 is tightly attached to the buffer member 153 and has a certain pre-pressure, so that when the friction reducing member 152 acts on the buffer member 153, the buffer member 153 can absorb enough buffer force.

Through the structure arrangement, when a user performs grass mowing operation, when the grass mowing rope 18 penetrates in or out of the line outlet buckle 151, particularly when paying off or winding, due to the fact that the anti-friction piece 152 exists between the grass mowing rope 18 and the line outlet buckle 151, the grass mowing rope 18 can drive the first rotating piece 152b to rotate, so that the interaction force between the grass mowing rope 18 and the line outlet buckle 151 is changed from sliding friction or static friction into rolling friction, and the interaction force between the grass mowing rope 18 and the line outlet buckle 151 is reduced; when the grass cutting head 10 is subjected to a large load or local stress at the grass cutting rope 18 and the first threading hole 151e is excessive during trimming operation, the grass cutting rope 18 transmits the stress to the buffer member 153 through the antifriction member 152, so that the acting force between the grass cutting rope 18 and the thread-out buckle 151 is reduced, and the probability of the grass cutting rope 18 being cut off at the thread-out buckle 151 is reduced.

In order to avoid the rope 25 of beating the grass directly to cut in the knot department of being qualified for the next round of competitions for beat the grass rope 25 card go into the knot of being qualified for the next round of competitions and can't be automatic or manual emit, the knot structure of being qualified for the next round of competitions as the third embodiment that fig. 15 shows has still been set up, in this embodiment, beat the grass head 20 and include 24 and the knot main part of being qualified for the next round of competitions that can supply the rope 25 of beating the grass to penetrate or wear out of being qualified for the next round of competitions of 24 of knot of being qualified for the next round of competitions of line knot main part, wherein, the effort of beating the rope 25 of beating the grass through the knot of being qualified for the next round of competitions of the action force of knot relative direction when 24 of knot of the rope 25 of beating the grass is detained in the line.

As shown in fig. 15 to 16, the head casing 21 is formed with a third receiving groove 211 for receiving the wire clip 24, the third receiving groove 211 is formed by two second protruding portions formed at the position of the wire clip on the head casing 21, and the wire clip 211 at least partially protrudes from the main body of the grass trimmer 20, so that the grass trimmer 20 rotates at a high speed and inevitably contacts with the outside during the grass trimming process of the grass trimmer, and the wire clip 24 is easily damaged by the impact during the grass trimming process, so that the wire clip 24 is protected by the third receiving groove 211, and the wire clip 24 is prevented from being damaged by the external force.

As shown in fig. 17 to 20, in the present embodiment, the second outlet buckle assembly includes: the wire outlet buckle body 22, the second antifriction piece 23 and the wire buckle 24. The line outgoing buckle body 22 comprises a first body part 222 and a second body part 223, the first body part 222 and the second body part 223 form a fixed connection or a detachable connection to form the line outgoing buckle body 22, the line outgoing buckle body 22 forms a second threading hole 221 through which the grass mowing rope 25 can penetrate or penetrate, and the inner wall of the second threading hole 221 is continuous and smooth. A second rotation shaft 222a and a first retaining portion 222b are formed or connected to the first body portion 222, and a third rotation shaft 223a and a second retaining portion 223b are formed or connected to the second body portion 223; the second rotating shaft 222a or the third rotating shaft 223a is a hollow first cylinder, one end of which is open, and one end of which is formed or connected to the outgoing line buckle body 22, the first anti-falling part 222b or the second anti-falling part 223b is a second cylinder, the outer diameter of which is smaller than the inner diameter of the second rotating shaft 222a or the third rotating shaft 223a, and third protruding parts are further formed or connected on the outer surface of the second cylinder, and are uniformly distributed around the second cylinder and have certain elastic force, in this embodiment, 3 third protruding parts are preferably provided. It can be understood that 2 or more third protruding portions may be provided, or a continuous protruding structure may be provided around the second cylinder, and all that is required is to prevent the first anti-slip portion 222b from actively separating from the second rotating shaft 222a when being clamped into the second rotating shaft 222a or prevent the second anti-slip portion 223b from actively separating from the third rotating shaft 223a when being clamped into the third rotating shaft 223 a. The second wear reducing member 23 includes a second rotating member 231 and a third rotating member 232, and the second rotating member 231 and the third rotating member 232 are at least partially communicated with the second threading hole 221; the second rotating member 231 may be a rotating bearing or a roller, which is mounted to the second rotating shaft 222a and can rotate around the second center direction 105 in which the second rotating shaft 222a is located, and in addition, the second rotating member 231 can axially move along the second center direction 105; the third rotating member 232 is connected or formed with a wire buckle 24, the wire buckle 24 includes a connecting portion 241, an extending portion 242 and a wire portion 243, the connecting portion 241 is connected or formed on the third rotating member 232, in the present embodiment, the wire buckle 24 is preferably integrally formed with the third rotating member 232, the end of the extending portion 242 extending from the connecting portion 241 is connected or formed with a wire portion 243, the wire portion 243 is substantially in a "V" shape, the grass mowing cord 25 can be clamped into the wire portion 243 and can freely slide in the wire portion 243, specifically, the surface of the wire portion 243 forms a continuous and smooth curved surface, which can effectively reduce the interaction force between the wire portion 243 and the grass mowing cord 25, and reduce the wear rate of the grass mowing cord 25 at the wire portion 243; further, wire knot 24 can rotate around the third rotation direction along with third rotation piece 232, and the rope 25 of beating grass has along second rotation direction pivoted trend when detaining through going out the line, and under the mode of beating grass, the rope 25 of beating grass owing to receive the reaction force of vegetation etc. has, and the rope 25 of beating grass drives third rotation piece 232 and rotates to preset position along the second rotation direction this moment, and wire knot 24 supports the rope 25 of beating grass and avoids the rope 25 of beating grass to twine to the head 20 of beating grass. It can be understood that, with the above arrangement, when the grass mowing rope 25 passes through the outlet buckle body 22, the grass mowing rope 25 generates rolling friction with the second rotating member 231 at the second outlet hole and is in line contact with the third rotating member 232, so as to generate smaller sliding friction; when the grass mowing rope 25 passes through the wire buckle 24, the grass mowing rope 25 is in surface contact with the surface of the wire part 243, the friction force of the grass mowing rope 25 is slightly larger than that of the grass mowing rope 25 passing through the second wire threading hole 221 of the wire buckle, so that the probability that the grass mowing rope 25 is cut at the wire buckle 24 is far greater than that of the grass mowing rope 25 cut at the wire buckle body 22, and when the grass mowing rope 25 is cut at the wire buckle 24, the end of the grass mowing rope 25 is far away from the wire buckle and has a certain length, and the grass mowing rope is enough to be paid off again under the condition that the grass mowing head 20 is not detached.

As shown in fig. 21 to 22, the third rotating member 232 may not be provided with the wire buckle 24, and in this case, the third rotating member 232 may freely rotate around the third center direction 106 and can axially move along the third center direction 106. The rope 25 of beating grass is rolling friction when second through wires hole 221 is located second rotation piece 231 or the contact of third rotation piece 232, very big reduction the relative effort of rope 25 of beating grass and second through wires hole 221 contact surface to reduced rope 25 of beating grass and detained body 22 department and cut being qualified for the next round of competitions of being qualified for the next round of competitions, broken end card is in the play line detains 151 body 22 department can't stretch out, perhaps the broken end contracts in the play line detains body 22, leads to the unable condition of being qualified for the next round of competitions to appear.

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

1. A lawnmower comprising:

the grass mowing head is used for mowing grass;

the motor is used for driving the grass mowing head to rotate around a first axis;

an operating device for controlling rotation of the motor;

the grass cutting head includes:

a spool for winding the mowing cord;

the head shell is used for accommodating at least part of the spool and is connected with or formed with a wire outlet buckle;

the method is characterized in that:

the head shell is formed with and supplies the first holding tank of play line knot activity, the play line knot forms and supplies the through wires hole that the rope of beating the grass penetrated or wore out, the play line is detained and is installed extremely can be relative during the first holding tank head shell produces the displacement.

2. A lawnmower according to claim 1, wherein:

the head of beating the grass still includes:

and the antifriction part is at least partially positioned in the range of the threading hole and can directly act on the grass mowing rope, and the antifriction part can reduce the acting force of at least part of the grass mowing rope on the outgoing line buckle.

3. A lawnmower according to claim 2, wherein:

the grass cutting head also comprises:

the buffering piece is at least partially connected to the antifriction piece and can absorb the acting force of at least part of the grass beating rope on the antifriction piece.

4. A lawnmower according to claim 2, wherein:

the friction reducing member includes:

the base is fixedly connected to the wire outlet buckle and forms or is provided with a rotating shaft;

a rotating member connected to the rotating shaft and rotatable around the rotating shaft;

when the rotating member is mounted to the rotating shaft, the rotating member can also move in the axial direction of the rotating shaft.

5. A lawnmower according to claim 3, wherein:

the buffer part is a spring which directly or indirectly acts on the antifriction part.

6. A lawnmower according to claim 4, wherein:

the outlet thread is buckled and is formed with the installation department, the installation department at least part with the through wires hole intercommunication, antifriction spare install extremely in the installation department and can be at the within range free movement at installation department place.

7. A lawnmower according to claim 6, wherein:

the mounting portion is capable of limiting axial displacement of the friction reducing member along the first axis.

8. A lawnmower according to claim 1, wherein:

the grass mowing head further comprises an operating part, an outer transmission mechanism is formed on the operating part, an inner transmission mechanism is formed on the spool, and the outer transmission mechanism is matched with the inner transmission mechanism to achieve synchronous rotation of the operating part and the spool;

the operating piece is provided with a first driving part; the head shell is provided with a second driving part, and when a user triggers the operating piece, the first driving part is matched with the second driving part to drive the spool to rotate so as to pay out the grass mowing rope.

9. A lawnmower according to claim 8, wherein:

the first driving part is embodied as a set of driving teeth having a driving surface deviating from the first axial direction and a stop surface substantially along the first axial direction;

the second driving portion is formed with a projection substantially in a direction perpendicular to the first axis.

10. A lawnmower according to claim 8 or claim 9, wherein:

the grass mowing head further comprises a biasing element, the operating member is biased to the spool through the biasing element when the operating member is triggered by a user, and the operating member can be reset under the action of the biasing element when the operating member is disengaged by the user.