CN109379975B

CN109379975B - Grass trimmer and externally inserted winding grass trimmer head thereof

Info

Publication number: CN109379975B
Application number: CN201711356817.2A
Authority: CN
Inventors: 郭建朋
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2017-08-07
Filing date: 2017-12-16
Publication date: 2024-06-18
Anticipated expiration: 2037-12-16
Also published as: CN109379973B; CN207720711U; CN207665488U; CN208079805U; CN109379974A; CN207665489U; CN207720709U; CN208079804U; CN109379973A; CN207720710U; CN207665486U; CN109379975A

Abstract

The invention discloses a grass cutting machine and an externally inserted winding grass cutting head thereof; the grass trimmer includes: an externally inserted winding grass cutting head; the grass cutting machine has an automatic winding mode, and the motor drives at least one of the spool and the housing to rotate the spool and the housing relative to each other to automatically wind the grass cutting rope onto the spool; the externally inserted wire winding grass cutting head comprises a spool, wherein the spool comprises an upper spool and a lower spool; the upper bobbin includes: an upper winding part; an upper flange part of the upper spool connected to the upper end of the upper winding part; the lower flange part of the upper spool is connected to the lower end of the upper winding part; the lower spool includes: a lower winding part; a lower spool upper flange portion connected to an upper end of the slave lower winding portion; a lower spool lower flange portion connected to a lower end of the slave lower winding portion; the upper spool and the lower spool are combined to form a threading channel for the grass rope to penetrate through the spool. The grass trimmer disclosed by the invention can automatically wind the grass trimming rope to the spool under the action of the motor, the spool is simple to process, and the grass trimming rope is reliably fixed.

Description

Grass trimmer and externally inserted winding grass trimmer head thereof

Technical Field

The invention relates to a grass cutting machine and an externally inserted winding grass cutting head thereof.

Background

The grass trimmer is 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 which is used for winding the grass cutting rope, and the grass cutting rope is gradually consumed due to abrasion when the grass cutting operation is carried out. When the user performs a certain period of work, the user needs to replace the new grass rope and wind the grass rope on the spool. Traditional rope of beating grass, the user need go manual rotation spool in order to make rope of beating grass twine to the spool, and troublesome operation, winding speed is slow, thereby also brings certain risk because the staff contacts the head of beating grass at winding in-process.

The outer plug wire winding grass mowing head comprises a spool. The traditional spool structure of the externally-inserted winding grass mowing head is complex in structure and difficult to process, and reliable fixing of a grass mowing rope cannot be met when a motor drives a spool to rotate for winding.

Disclosure of Invention

In order to solve the defects in the prior art, the invention aims to provide a grass cutting machine with an automatic winding mode and an externally-inserted winding grass cutting head with convenient and quick structure processing.

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

An externally inserted wound grass cutting head comprising: a housing; a spool at least partially disposed within the housing and rotatable relative to the housing about a central axis; wherein the spool comprises an upper spool and a lower spool; the lower spool is coupled to the upper spool; the upper bobbin includes: an upper winding part for winding the grass mowing rope; an upper flange part of the upper spool connected to the upper end of the upper winding part; the lower flange part of the upper spool is connected to the lower end of the upper winding part; the lower spool includes: a lower winding part for winding the grass mowing rope; a lower spool upper flange portion connected to an upper end of the slave lower winding portion; a lower spool lower flange portion connected to a lower end of the slave lower winding portion; the upper spool and the lower spool are combined to form a threading channel for the grass rope to penetrate through the spool.

Further, the threading channel extends along a curve.

Further, the upper spool and the lower spool combine to form at least two interdigitated threading channels.

Further, the upper spool and the lower spool are combined to form three threading channels which can be arbitrarily two mutually crossed; the three threading channels are arranged around the central axis.

Further, the housing includes an upper housing and a lower housing; the spool is arranged between the upper shell and the lower shell; the lower shell is provided with a protruding part protruding towards the upper shell direction; the lower spool is provided with a groove matched with the protruding part; the protrusion cooperates with the groove to guide the housing to move along the central axis relative to the spool.

Further, the protruding portion is formed with a mounting groove; the externally inserted winding grass cutting head also comprises a bearing and a knocking cap; the bearing is arranged in the mounting groove; the bearing connects the knocking cap and the lower shell.

Further, the groove penetrates through the lower spool along the central axis; the externally inserted winding grass cutting head also comprises a spring; the spring passes through the groove and is arranged between the upper spool and the lower shell; the spring applies a force that moves the upper spool and the lower housing away from each other.

Further, the upper housing is formed with first mating teeth; the spool is formed with first engagement teeth that mate with the first mating teeth; the first engagement tooth is formed with a bevel.

Further, the externally inserted winding grass cutting head also comprises an outlet buckle sleeve; the outlet buckle sleeve is fixed to the shell and used for the grass mowing rope to penetrate out of the shell.

A grass trimmer comprising: the externally inserted winding grass cutting head; the motor drives the externally inserted winding grass cutting head to rotate; the grass cutting machine has an automatic winding mode in which the motor drives at least one of the spool and the housing to rotate the spool and the housing relative to each other to automatically wind the grass cutting rope onto the spool; and the damping device plays a role in damping at least one of the spool and the shell so as to enable the grass trimmer to be in an automatic winding mode.

Further, the motor has a motor shaft; the upper bobbin is fixed to a motor shaft of the motor.

A grass trimmer comprising: the externally inserted winding grass cutting head; the motor drives the externally inserted winding grass cutting head to rotate; the grass cutting machine is provided with an automatic winding mode and a cutting mode; in a cutting mode, the motor rotates positively to drive the externally inserted winding grass cutting head to rotate along one direction; in the automatic winding mode, the motor rotates in opposite directions relative to one another to drive the spool or housing in reverse.

The grass trimmer has the advantages that the grass trimmer is provided with an automatic winding mode, the grass trimming rope can be automatically wound on the spool under the action of the motor, the spool is simple and quick to process, and the spool is assembled to achieve reliable positioning of the grass trimming rope so that the motor can drive the spool to rotate to enable the grass trimming rope to be wound on the spool.

Drawings

FIG. 1 is a schematic view of a lawnmower;

FIG. 2 is a schematic view of a part of the grass trimmer of FIG. 1;

FIG. 3 is a schematic view of a first housing of the mower of FIG. 2;

FIG. 4 is a schematic view of the working housing of FIG. 1;

FIG. 5 is an exploded view of a portion of the structure of FIG. 4;

FIG. 6 is a cross-sectional view of the grass cutting head and motor of FIG. 1;

FIG. 7 is an exploded view of the grass cutting head and motor of FIG. 1;

FIG. 8 is an exploded view of the grass cutting head of FIG. 7;

FIG. 9 is an exploded view of the grass cutting head, motor and working device of FIG. 4;

FIG. 10 is an exploded view of the grass cutting head, motor and working device of FIG. 4 from another perspective;

FIG. 11a is a cross-sectional view of the connecting rod of FIG. 1;

FIG. 11b is a schematic view of the connecting rod addition insert of FIG. 11 a;

FIG. 12 is a schematic view of a tapping cap of the grass cutting head of FIG. 6;

FIG. 13 is a schematic view of the upper housing of the grass cutting head of FIG. 9;

FIG. 14 is a schematic view of a spool of the grass cutting head of FIG. 9;

FIG. 15 is a schematic view of the spool of FIG. 14 from another perspective;

FIG. 16 is an exploded view of the spool of FIG. 14;

FIG. 17 is an exploded view of the spool of FIG. 14 from another perspective;

FIG. 18 is a schematic view of the spool and outlet clasp of the grass cutting head of FIG. 9;

FIG. 19 is a schematic view of the threading channel of the spool of FIG. 19;

FIG. 20a is a schematic view of the outlet clasp of the grass cutting head of FIG. 9;

FIG. 20b is a schematic view of the outlet ferrule of FIG. 20a from another perspective;

fig. 20c is a cross-sectional view of the outlet grommet of fig. 20 a;

FIG. 21a is a schematic view of the first engaging tooth and first mating tooth of the grass cutting head of FIG. 8 sliding in contact with each other;

FIG. 21b is a schematic view of the first locating surface and the second locating surface of FIG. 21a in contact;

FIG. 22 is a schematic view of a grass cutting head including a spool with bumps formed thereon;

FIG. 23 is a schematic view of the spool and lower housing of FIG. 22;

FIG. 24 is a schematic illustration of a shell-forming tab;

FIG. 25 is a schematic view of another spool;

FIG. 26 is an exploded view of the spool of FIG. 25;

FIG. 27 is a schematic view of another spool;

FIG. 28 is an exploded view of the spool of FIG. 27;

FIG. 29 is an exploded view of the spool of FIG. 27 from another perspective;

FIG. 30 is a schematic view of another grass cutting head;

FIG. 31 is an exploded view of the grass cutting head of FIG. 30 from another perspective;

FIG. 32 is a schematic view of a spool of the grass cutting head of FIG. 30;

FIG. 33 is a schematic view of another grass cutting head;

FIG. 34 is an exploded view of the grass cutting head of FIG. 33;

FIG. 35 is a schematic view of the first and second magnetic elements of the grass cutting head of FIG. 33;

FIG. 36 is a schematic view of the grass cutting head of FIG. 33 from another perspective with respect to the first and second magnetic members;

FIG. 37 is a schematic view of another grass cutting head;

FIG. 38 is an exploded view of the grass cutting head of FIG. 37;

FIG. 39 is a schematic view of a grass cutting head and friction member;

FIG. 40 is an exploded view of the grass cutting head of FIG. 39;

FIG. 41 is a schematic view of a grass cutting head and stop;

FIG. 42 is an exploded view of the stop of the grass cutting head of FIG. 41 from another perspective;

FIG. 43 is a schematic view of a motor and grass cutting head.

Detailed Description

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

As shown in fig. 1 to 3, a grass trimmer 100 includes: motor 10, control device 20, working device 30 and connecting tube 40.

The control device 20 is operated by a user to control the grass trimmer 100. Specifically, the manipulation device 20 includes a handle 21, a first switch 22, and a first manipulation member 23. The handle 21 is to be held by a user. The handle 21 includes a handle housing 211. The first switch 22 is disposed within the handle housing 211. The handle housing 211 includes: left handle housing 211a and right handle housing 211b. The first switch 22 is located between the left handle housing 211a and the right handle housing 211b. The left handle housing 211a and the right handle housing 211b clamp the connection pipe 40 from both sides. Further, the lawnmower 100 also includes an auxiliary handle 212. The auxiliary handle 212 is fixed to the connection pipe 40.

The first operating member 23 is operated by a user while holding the handle 21 to control the first switch 22. The first switch 22 is electrically connected to the motor 10. The first switch 22 is capable of controlling the motor 10. The first switch 22 may activate the motor 10 to cause the mower 100 to perform a cutting function. Further, the first switch 22 can also control the rotational speed of the motor 10. The first operating member 23 acts as a trigger. The operating device 20 further comprises a locking member 24 for preventing the first operating member 23 from being activated by mistake. When the lock 24 is triggered, the first operating member 23 can be operated by the user. The locking member 24 is a trigger. The first operating member 23 is rotatably connected to the handle housing 211 about the first axis 103. The locking member 24 is rotatably connected to the handle housing 211 about the second axis 104. The first axis 103 is perpendicular to the second axis 104. The connection tube 40 extends along a first line 105. The first axis 103 is perpendicular to the first line 105. The second axis 104 is perpendicular to the second axis 104. The user can trigger the locking member 24 by the thumb while holding the handle 21, and then trigger the first operating member 23 by the index finger for convenient and comfortable operation.

As shown in fig. 4 to 6, the working device 30 is used to implement a tool function. Working device 30 includes a grass cutting head 50. The grass cutting head 50 is used for accommodating a grass cutting rope 101, and the grass cutting rope 101 is partially exposed out of the grass cutting head 50, and is driven by the grass cutting head 50 to rotate for cutting vegetation. The motor 10 drives the grass cutting head 50 to rotate. Grass cutting head 50 includes spool 53 and housing 52. Spool 53 is used for winding grass line 101. Spool 53 is at least partially located within housing 52.

As shown in fig. 1 and 2, the connection pipe 40 connects the manipulation device 20 and the working device 30. The connection pipe 40 connects the grass cutting head 50 and the handle 21.

The lawnmower 100 has an automatic winding mode and a cutting mode.

When the grass trimmer 100 is in the automatic winding mode, the grass trimmer line 101 can be wound onto the spool 53 automatically without requiring a person to rotate the spool 53, the housing 52, or the grass trimmer line 101. Specifically, in the automatic winding mode, the motor 10 drives at least one of the spool 53 and the housing 52 to relatively rotate the spool 53 and the housing 52 to automatically wind the grass rope 101 to the spool 53.

In the cutting mode, the motor 10 drives the spool 53 and the housing 52 to rotate synchronously; the threshing cord 101 remains relatively fixed with the spool 53. Thereby realizing that the motor 10 drives the grass cutting head 50 to rotate so as to drive the grass cutting rope 101 to rotate and realize the cutting of vegetation.

As shown in fig. 5 and 6, the working device 30 further includes a second switch 31 and a second operating member 32. The second switch 31 is electrically connected to the motor 10. The second operating member 32 is operated by a user to control the second switch 31. The second switch 31 controls the motor 10 to place the grass cutter 100 in or into the automatic winding mode, and the motor 10 drives at least one of the spool 53 and the housing 52 to rotate the spool 53 and the housing 52 relative to automatically wind the grass cutting rope 101 to the spool 53. The first switch 22 controls the motor 10 to enable the grass cutter 100 to be in or enter a cutting mode, and the motor 10 drives the spool 53 and the shell 52 to synchronously rotate, so that the grass beating rope 101 is driven to rotate to cut vegetation.

In a specific embodiment, the grass trimmer 100 is in the automatic winding mode, and the rotational speed of the spool 53 is equal to or greater than 100rpm and equal to or less than 2000rpm. Specifically, the rotational speed of the spool 53 is 300rpm or more and 800rpm or less. As another embodiment, the rotational speed of the spool 53 is 30rpm or more and 600rpm or less. Or the rotational speed of the spool 53 is 60rpm or more and 300rpm or less. The ratio of the rotational speed of the spool 53 in the cutting mode to the rotational speed of the spool 534 in the automatic winding mode is equal to or greater than 5 and equal to or less than 300. Further, the ratio of the rotational speed of the spool 53 in the cutting mode to the rotational speed of the spool 534 in the automatic winding mode is 10 or more and 200 or less.

As shown in fig. 4, 5, 9 and 10, the working device 30 further includes a working housing 33. The working housing 33 is used to connect the parts of the working device 30 as a unit. As a specific embodiment, the working housing 33 includes a switch housing 331 and a motor housing 332. The switch housing 331 and the motor housing 332 may be integrated as a unit as well as the housing 52 as two separate separable parts. Specifically, the switch housing 331 is used to fix and house the second switch 31. The motor housing 332 is used to house or mount the motor 10. The switch housing 331 is fixed to the motor housing 332. The working housing 33 is connected to one end of the connection pipe 40. Specifically, the motor housing 332 is fixed to one end of the connection pipe 40. The switch housing 331 is connected to one end of the connection pipe 40. The connection pipe 40 passes through the switch housing 331. The switch housing 331 includes a first switch housing 331a and a second switch housing 331b. The first and second switch housings 331a and 331b are disposed at both sides of the connection pipe 40. The motor 10 and the grass cutting head 50 are arranged at the same end of the connecting pipe 40, and the motor 10 is positioned in the working shell 33.

As an alternative embodiment, the motor is arranged at the end of the connecting pipe remote from the grass cutting head, i.e. the motor is not located in the working housing.

The guard 70 provides safety protection against injury to the user by the grass rope 101. As a specific embodiment, the shroud 70 is fixed to the working housing 33. Specifically, the shroud 70 is fixed to the motor housing 332. The switch housing 331 is at least partially located between the motor housing 332 and the shroud 70. As an alternative embodiment, the shield is fixed to the connection tube.

The second operating member 32 is adjacent the grass cutting head 50. The user can directly operate the second operating member 32 to start the automatic winding function after completing the combination of the straw rope 101 and the spool 53. The first operating member 23 is remote from the grass cutting head 50. The user can keep away from the grass cutting head 50 when holding the handle 21 for cutting operation, preventing danger. The first operating member 23 and the second operating member 32 are remote from each other. The first and second operating members 23 and 32 are disposed at both ends of the connection pipe 40 such that a user cannot touch the second operating member 32 when operating the first operating member 23, and also cannot touch the first operating member 23 when operating the second operating member 32. The danger caused by the fact that one operating element is touched by a user by mistake when the user operates the other operating element can be effectively avoided.

The second operating member 32 and the second switch 31 are located at both sides of the connection pipe 40. Specifically, the present invention relates to a method for manufacturing a semiconductor device. The second switch 31 is disposed below the connection pipe 40, and the second operating member 32 is disposed above the connection pipe 40. The grass cutting head 50 and the second operating member 32 are located at both sides of the connection pipe 40. The second operating member 32 is located above the connection pipe 40 away from the grass cutting head 50 to prevent the user from hurting the human body by the grass cutting rope 101 when operating the second operating member 32. The motor housing 332 and the connection tube 40 form an included angle region. Or the grass cutting head 50 and the connecting pipe 40 form an included angle region. The second switch 31 is located in an included angle area, and the area protects the second switch 31 to prevent the second switch 31 from being damaged due to grounding. The second operating member 32 and the second switch 31 are located on both sides of the connecting tube 40, and the problem of excessive volume caused by being located on the same side is avoided.

As shown in fig. 2 and 3, the grass trimmer 100 further includes a circuit board 65, a first housing 60, and a battery pack 66. The circuit board 65 is electrically connected to the first switch 22. The circuit board 65 is electrically connected to the second switch 31. The first chassis 60 accommodates a circuit board 65. The circuit board 65 electrically connects the motor 10 and the battery pack 66 such that the battery pack 66 supplies power to the motor 10 and controls the motor 10.

The first housing 60 is formed with a first cavity 64 that accommodates a circuit board 65. The motor housing 332 is formed with a second cavity 333 that accommodates the motor 10. The connection pipe 40 has a hollow tubular structure. The connection pipe 40 is formed with an air flow passage 47 communicating the first chamber 64 and the second chamber 333. The cooling air flow can communicate with the first chamber 64 and the second chamber 333 through the air flow passage 47 to cool the motor 10 and the circuit board 65.

The mower 100 includes a lead 49, the lead 49 electrically connecting the battery pack 66 and the motor 10. The wire 49 is located within the connection tube 40.

As an alternative embodiment, the first housing and the handle housing may be provided as a single piece. When the first housing and the handle housing are described as a single unit, it is to be understood that the unit may be described as either a first housing or a handle housing.

The battery pack 66 is detachably connected to the first housing 60. The first housing 60 is fixed to one end of the connection pipe 40. Specifically, the first housing 60 and the motor housing 332 are fixed to both ends of the connection pipe 40, respectively.

As an alternative embodiment, the grass trimmer includes an electrical cable. The cable is connected to a battery pack or a utility grid.

As an alternative embodiment, the grass trimmer may be provided without an operating member. I.e. the lawnmower does not comprise one or both of the first operating element and the second operating element. And a non-contact switch is adopted to control the grass mowing machine.

Specifically, the grass trimmer is not provided with the second operating member and the second switch. The grass trimmer comprises a non-contact switch. Alternatively, the second switch is a non-contact switch. The non-contact switch is used to activate the motor 10 to cause the motor 10 to drive at least one of the spool 53 and the housing 52 to rotate the spool 53 and the housing 52 relative to each other to automatically wind the grass line 101 onto the spool 53.

As an alternative embodiment, the non-contact switch is a voice-controlled switch. As an alternative embodiment, the contactless switch is a photoswitch. As an alternative embodiment, the non-contact switch is an infrared-sensitive switch. As an alternative embodiment, the non-contact switch is a magnetic switch. As an alternative embodiment, the contactless switch is a proximity switch.

The lawnmower 100 also includes a remote control. The remote controller realizes remote control so as to control the on-off of the non-contact switch. The user may control the mower 100 using a mobile device, such as a cell phone.

As an alternative embodiment, the grass cutting head 50 and the non-contact switch are located at the same end of the connecting tube 40.

As an alternative embodiment, the grass cutting head 50 and the non-contact switch are located at both ends of the connecting pipe 40.

As an alternative embodiment, the non-contact switch is located within the first housing 60.

As an alternative embodiment, the non-contact switch and the first switch 22 are located within the handle housing 211.

As an alternative embodiment, a non-contact switch is located within the connecting tube 40.

As shown in fig. 1 and 11a, the connection tube 40 includes an inner layer member 44 made of a fibrous material and an outer layer member 45 made of a fibrous material. The outer layer member 45 is wrapped around the outer periphery of the inner layer member 44. The thickness of the inner layer 44 is greater than the thickness of the outer layer 45.

Specifically, the fiber arrangement direction of the inner layer member 44 is different from the fiber arrangement direction of the outer layer member 45.

The inner layer 44 is rolled from a plurality of layers of fibrous material sheets arranged in a stacked arrangement. The fiber arrangement direction of the inner layer member 44 extends along a straight line. The fiber arrangement direction of the inner layer member 44 coincides with the extending direction of the connection pipe 40. The fibers of the outer layer 45 are arranged in a cross arrangement.

The inner layer 44 has a high strength and the outer layer 45 improves the reliability of the bonding of the multiple layers of fibrous material sheets. The connection pipe 40 has high strength, reliability and stability.

The wall thickness of the connection pipe 40 is 0.5mm or more and 1.5mm or less.

Specifically, the density of the motor housing 332 is greater than the density of the handle housing 211. The handle housing 211 has a density greater than the density of the inner layer 44.

As a specific embodiment, the inner layer 44 is made of carbon fiber material. The outer layer 45 is made of carbon fiber material. The handle housing 211 is made of a plastic material. The motor housing 332 is made of a metallic material.

The connecting tube 40 may be a complete long tube or may be formed by connecting multiple long tubes. As a specific embodiment, the connection pipe 40 is formed by connecting a first connection pipe 41 and a second connection pipe 42. The connection seat 43 connects the first connection pipe 41 and the second connection pipe 42. Is convenient for storage and transportation.

As shown in FIG. 3, the mower 100 also includes a retaining clip 48. The fixing clip 48 is made of a metal plate bent. The fixing clip 48 is sleeved on the outer circumference of the connection pipe 40. The fixing clip 48 fixes the connection pipe 40 to the first housing 60. The first housing 60 includes a first housing 61 and a second housing 62. The connection pipe 40 is located between the first housing 61 and the second housing 62. The first housing 60 further includes an arm rest 63 for supporting the arm of the user. The arm rest 63 is located at an upper portion of the first housing 60.

The ratio of the circumference of the connection pipe 40 to the dimension of the fixing clip 48 in the extending direction of the connection pipe 40 is 6 or more and 16 or less.

As an alternative embodiment, as shown in FIG. 11b, the connecting tube 40 also includes an insert 46. The inner layer 44 is wrapped around the outer periphery of the inner insert 46. The material of the insert 46 is different from the material of the inner layer 44. The insert 46 is made of plastic or of a metallic material.

As another alternative, the inner layer member is formed of a tubular body surrounded or stacked of fibrous material.

As shown in fig. 6, the grass cutting head 50 is used for installing and accommodating the grass cutting rope 101, a part of the grass cutting rope 101 is accommodated inside the grass cutting head 50, and a part of the grass cutting head 50 extends out of the grass cutting head 50 for cutting vegetation when the grass cutting head 50 rotates. The motor 10 drives the grass cutting head 50 to rotate around the central axis 102, thereby driving the grass cutting rope 101 to rotate for cutting vegetation. As an alternative embodiment, the electric motor can also be replaced by an internal combustion engine.

As shown in fig. 7 and 8, the grass-cutting head 50 includes a spool 53 and a housing 52. The motor 10 includes a motor shaft 11. The motor shaft 11 is connected to the spool 53 to drive the spool 53 to rotate. The housing 52 includes an upper housing 521 and a lower housing 522. The grass cutting head 50 further includes: a fan 58. The fan 58 is provided with blades for generating an air flow. The motor 10 can drive the fan 58 to rotate to generate an air flow.

The mower 100 comprises a damping device 80. Specifically, the damping device 80 includes a one-way bearing 81, the one-way bearing 81 acting to provide a one-way rotational connection of the housing 52 and the motor 10. Specifically, the one-way bearing 81 allows the housing 52 to rotate in only one direction relative to the motor 10 or the motor housing 332. I.e. the one-way bearing 81 prevents rotation of the housing 52 in one direction relative to the motor 10 or the motor housing 332.

As shown in fig. 6 to 10, the grass trimmer 100 is provided with a support 59. The support 59 is fixed to the motor 10 and enables the motor shaft 11 to pass through. The support member 59 is formed with a boss portion 591 to support the inner race of the one-way bearing 81. The inner race of the one-way bearing 81 is fitted around the outer periphery of the boss portion 591. The inner race of the one-way bearing 81 is fixed to the support 59.

A one-way bearing 81 is connected to the housing 52. Specifically, the one-way bearing 81 is connected to the housing 52 by an intermediate member. The part is configured as a fan 58. The one-way bearing 81 is not directly connected to the housing 52 but is disposed between the support member 59 and the fan 58 such that the fan 58 can only rotate in one direction relative to the support member 59. The fan 58 is connected to the housing 52 in a rotationally fixed manner, so that the housing 52 can also rotate in only one direction relative to the support 59. The fan 58 rotates in synchronization with the housing 52, and the fan 58 and the housing 52 cannot rotate relative to each other.

Specifically, the upper case 521 is formed with first connection teeth 5214, the fan 58 is formed with second connection teeth 581 to be engaged with the first connection teeth 5214, and the first connection teeth 5214 are engaged with the second connection teeth 581 to achieve synchronous rotation of the upper case 521 and the fan 58. The guiding action of the first connection tooth 5214 in cooperation with the second connection tooth 581 enables the housing 52 to slide along the central axis 102 relative to the fan 58 and enables the fan 58 to rotate with the housing 52 about the central axis 102.

As an alternative embodiment, the one-way bearing is fixed to the housing.

As an alternative embodiment, the housing forms a fan blade for generating the air flow. I.e. no separate fan is provided or the fan and the housing as a whole.

In the cutting mode, the motor shaft 11 rotates to drive the spool 53 to rotate, and the spool 53 drives the upper housing 521 to rotate. Specifically, spool 53 is formed with first engagement teeth 536. The upper case 521 is formed with first mating teeth 5211. The first engagement tooth 536 is engaged with the first engagement tooth 5211, thereby rotating the upper case 521 by the spool 53.

The fan 58 is rotated by the upper housing 521. The fan 58 is rotatable relative to the motor housing 332 in a first direction (see the direction indicated by arrow 106 in fig. 4) by the unidirectional bearing 81. At this time, the motor 10 rotates forward to drive the spool 53 and the housing 52 to rotate in the first direction. I.e. it is achieved that the motor 10 drives the grass-cutting head 50 in a first direction. The motor 10 drives the spool 53 and the housing 52 to rotate in synchronization.

When the user needs to supplement the string 101, the user may insert the string 101 through the outer threading hole 544 into the housing cavity 511 and then through the inner threading hole 5351 through the threading channel 5352 out of the opposite outer threading hole 544 to the outside of the housing 52. When it is desired to wind the rope around the spool, the user does not need to open the housing, i.e., separate the upper housing and the lower housing. The grass mowing rope can be directly penetrated into the shell and then wound on the spool through the relative rotation of the spool and the shell, and the grass mowing head is commonly called as an externally-inserted winding grass mowing head

The user controls the mower 100 to cause the mower 100 to perform an automatic winding mode. The motor 10 rotates reversely to drive the spool 53 to rotate in a second direction opposite to the first direction, the fan 58 cannot rotate in the second reverse direction due to the rotation stopping effect of the unidirectional bearing 81, the fan 58 and the housing 52 are connected through the first connecting teeth 5214 and the second connecting teeth 581, that is, the housing 52 cannot rotate in the second direction, and the winding shaft 53 rotates in the second direction relative to the housing 52 under the drive of the motor shaft 11 to realize automatic winding.

The first mating tooth 5211 or the second mating tooth 5223 are ratchet teeth so that the spool 53 and the housing 52 can rotate relative to each other in an automatic winding mode and the spool 53 can rotate the housing 52 in a cutting mode.

The lawnmower 100 also includes a fan housing 334. The fan housing 334 is fixed to the motor housing 332. The fan housing 334 covers the blades of the fan 58 at least in a radial direction of the central axis 102 to act to prevent grass clippings from winding around the fan 58. And the fan housing 334 changes the airflow direction of the fan 58 so that the airflow generated by the fan 58 can blow grass clippings radially outward and downward along the central axis 102.

The motor shaft 11 directly drives the spool 53 to rotate, the housing 52 can rotate relative to the spool 53, and the housing 52 can slide relative to the spool 53 along the central axis 102. The housing 52 slides relative to the spool 53 between a first axial position and a second axial position.

When the housing 52 is in a first axial position relative to the spool 53, the first mating teeth 5211 and the first engagement teeth 536 mate such that the spool 53 rotates to provide for synchronous rotation of the housing 52.

The lawnmower 100 has a payoff mode. The payout mode enables the grass cutting rope 101 wound onto the spool 53 to be partially released to increase the length of the grass cutting rope 101 exposed outside the grass cutting head 50. While the grass trimmer 100 is in the cutting mode, the user taps the grass trimmer head 50 to move the housing 52 from the first axial position to the second axial position, and the spool 53 can be rotated relative to the housing 52 to release a portion of the grass trimmer line 101.

Specifically, spool 53 is formed with first engagement tooth 536 and second engagement tooth 537. The housing 52 is formed with a first mating tooth 5211 that mates with the first mating tooth 536 and a second mating tooth 5223 that mates with the second mating tooth 537. The plurality of first mating teeth 5211 are arranged in a circumferential direction of the central axis 102. The plurality of first engagement teeth 536 are arranged in a circumferential direction of the central axis 102. Specifically, the first engagement tooth 536 is provided at an upper portion of the spool 53. The second engagement tooth 537 is provided at the lower portion of the spool 53. The first mating teeth 5211 are formed on the upper housing 521 and the second mating teeth 5223 are formed on the lower housing 522.

When the housing 52 is moved to the second axial position, the first mating teeth 5211 and the first engaging teeth 536 are disengaged to enable relative rotation of the spool 53 and the housing 52. At this time, the second engagement tooth 537 and the second engagement tooth 5223 are engaged to rotate the housing 52 by a certain angle with respect to the spool 53 to release the grass rope 101 of a certain length.

Grass cutting head 50 also includes a spring 57, and spring 57 applies a force between lower housing 522 and spool 53 to move housing 52 to a first axial position that rotates in synchronization with spool 53. Specifically, the spring 57 is a compression spring. When the housing 52 is not subjected to an external force from a user striking the ground, the spring 57 applies a force to the housing 52 to return the housing 52 to the first axial position. Spool 53 is formed with a groove 5344. The spring 57 is disposed within the recess 5344. The lower case 522 is protruded with a protrusion 5221 toward the upper case 521. The projection 5221 and the recess 5344 cooperate with the guide housing 52 to move relative to the spool 53 between a first axial position and a second axial position. The spring 57 is disposed between the projection 5221 and the spool 53. One end of the spring 57 contacts the projection 5221. The other end of the spring 57 is provided with a first contact 571. The first contact 571 reduces wear between the spool 53 and the spring 57. The first contact 571 is a metal piece. Spool 53 and housing 52 are plastic pieces.

As an alternative embodiment, the spring may not be in direct contact with the housing. Specifically, a contact is provided between the spring and the housing. The contact is in direct contact with the spring.

As an alternative embodiment, the first engagement teeth are provided on the lower portion of the spool, the first mating teeth being formed with the lower housing. The spring applies a force to the spool or housing assembly that brings the first mating tooth into contact with the first mating tooth.

The spool 53 is provided with an inner threading hole 5351 through which the grass rope 101 is threaded. The inner threading hole 5351 may fix the straw rope 101.

Grass cutting head 50 includes a housing assembly 51. The housing assembly 51 is formed with a housing cavity 511. The housing assembly 51 is formed with an outer threading aperture 544. The straw rope 101 can extend from the exterior of the housing assembly 51 into the housing cavity 511. Spool 53 is at least partially disposed within housing cavity 511. Spool 53 is rotatable relative to housing assembly 51 about central axis 102.

Specifically, the housing assembly 51 includes a housing 52 and an outlet grommet 54. The housing 52 is formed with a housing cavity 511. The outlet grommet 54 is formed with an outer threading hole 544. A wire outlet grommet 54 is secured to the housing 52. The outlet ferrule 54 is made of a metallic material. The housing 52 is made of a plastic material. The thread out grommet 54 can prevent the grass rope 101 from wearing the wall of the outer thread passing hole 544.

As an alternative embodiment, the housing assembly includes a housing. The housing assembly does not include an outlet grommet. The housing forms an outer threading aperture. Specifically, the housing includes an upper housing and a lower housing. The housing assembly can also be said to include an upper housing and a lower housing.

The inner and outer threading holes 5351 and 544 can be automatically aligned to facilitate insertion of the straw rope 101 from the outer threading hole 544 into the housing cavity 511 and into the inner threading hole 5351 by a user. Or the grass rope 101 passing through the outer threading hole 544 can be directly threaded into the inner threading hole 5351.

The housing assembly 51 is formed with a first locating surface 5212. The spool 53 is formed with a second locating surface 5362 that mates with the first locating surface 5212. When the first positioning surface 5212 contacts the second positioning surface 5362, the inner threaded hole 5351 is aligned with the outer threaded hole 544.

The grass cutting head 50 also includes a drive member. The drive applies a force to the housing assembly 51 or spool 53 that causes relative rotation to bring the first and second locating surfaces 5212, 5362 into contact.

As a specific embodiment, the spring 57 serves as a driving member. A spring 57 is disposed between the housing assembly 51 and the spool 53. The spring 57 applies a force to the spool 53 or the housing assembly 51 that brings the first positioning surface 5212 and the second positioning surface 5362 closer to each other.

The first mating tooth 5211 or the first engaging tooth 536 has an inclined surface inclined to the square plane of the central axis 102. The inclined surface has an angle of 8 degrees or more and 18 degrees or less with respect to the normal plane of the central axis 102. The first mating teeth 5211 and the second mating teeth 5223 provide for relative rotation of the spool 53 and the housing 52 under the force of the spring 57 through the provision of inclined surfaces.

As shown in fig. 21a and 21b, as a specific embodiment, the first mating tooth 5211 is formed with a first inclined surface 5213 and a first positioning surface 5212. The first engagement tooth 536 is formed with a second inclined surface 5361 and a second positioning surface 5362.

The first inclined surface 5213 and the first positioning surface 5212 are located on both sides of the first mating tooth 5211. The second inclined surface 5361 and the second positioning surface 5362 are located on both sides of the first engagement tooth 536.

When the first positioning surface 5212 contacts with the second positioning surface 5362, two sides of the first mating tooth 5211 contact with two adjacent first engaging teeth 536.

When the first positioning surface 5212 contacts the second positioning surface 5362, the first inclined surface 5213 contacts the second inclined surface 5361.

The bobbin 53 is formed with a plurality of inner threading holes 5351, and the number of the inner threading holes 5351 is an even number. The number of first engagement teeth 536 is even. The plurality of inner threading holes 5351 are uniformly distributed in the circumferential direction of the axis of the spool 53. Specifically, the number of first engagement teeth 536 is the same as the number of inner threading holes 5351.

Also, the number of the second engagement teeth 537 is the same as the number of the inner threading holes 5351. The spool 53 is formed with 6 inner threading holes 5351. Spool 53 is formed with 6 first engagement teeth 536 and 6 second engagement teeth 537.

The spool 53 is formed with at least one winding portion 531 around which the grass rope 101 is wound, and two flange portions 532 provided at both ends of the winding portion 531. The inner threading hole 5351 is provided in the flange portion 532.

As a specific embodiment, the spool 53 includes two winding portions 531 and three flange portions 532.

The bobbin 53 includes an upper winding portion 5331, a lower winding portion 5341, an intermediate flange portion 535, an upper flange portion, and a lower flange portion. The upper winding part 5331 is wound with the grass rope 101. The lower winding portion 5341 is wound with the grass rope 101. The upper, lower and middle flange portions 535 limit the position of the straw rope 101. The upper flange portion is connected to an upper end of the upper wire winding portion 5331. The lower flange portion is connected to the lower end of the lower winding portion 5341. The intermediate flange portion 535 is located between the upper and lower wire wrapping portions 5331 and 5341. Specifically, the intermediate flange portion 535 is formed with an inner threading hole 5351 through which the grass rope 101 is threaded.

Spool 53 includes an upper spool 533 and a lower spool 534. The lower spool 534 is coupled to the upper spool 533 so that the two parts are integrated. The upper spool 533 includes an upper winding portion 5331, an upper spool upper flange portion 5332, and an upper spool lower flange portion 5333. The lower spool 534 includes a lower wire winding portion 5341, a lower spool upper flange portion 5342, and a lower spool lower flange portion 5343. The upper spool upper flange portion 5332 is connected to an upper end of the upper wire winding portion 5331. The upper bobbin lower flange portion 5333 is connected to the lower end of the upper wire winding portion 5331. The lower spool upper flange portion 5342 is connected to an upper end of the lower winding portion 5341. The lower spool lower flange portion 5343 is connected to the lower end of the lower wire winding portion 5341. The upper spool upper flange 5332 is the upper flange. The lower spool lower flange portion 5343 is a lower flange portion. The upper spool lower flange portion 5333 and the lower spool upper flange portion 5342 together constitute an intermediate flange portion 535.

The upper bobbin 533 and the lower bobbin 534 are combined to form a threading passage 5352 through which the grass rope 101 passes through the bobbin 53. Both ends of the threading passage 5352 are defined as inner threading holes 5351. The grass tying rope 101 can be threaded into the threading passage 5352 through the threading hole 5351.

The threading channel 5352 extends along a curve.

The upper spool 533 and the lower spool 534 combine to form at least two interdigitated threading channels 5352. Specifically, the upper bobbin 533 and the lower bobbin 534 are combined to form three threading passages 5352 capable of arbitrarily two intersecting each other. Three threading channels 5352 are arranged around the central axis 102.

The threading passage 5352 is formed by two parts of the upper spool 533 and the lower spool 534, which is advantageous in manufacturing the threading passage 5352.

The bobbin 53 is disposed between the upper case 521 and the lower case 522. Spool 53 is formed with a groove 5344. Specifically, the lower bobbin 534 is formed with a groove 5344. The lower case 522 is protruded with a protrusion 5221 toward the upper case 521. The projection 5221 cooperates with the recess 5344 to guide movement of the housing 52 relative to the spool 53 along the central axis 102. Spring 57 is at least partially located within recess 5344. The spring 57 is disposed between the upper spool 533 and the lower housing 522 through the groove 5344. The spring 57 applies a force that moves the upper spool 533 and the lower housing 522 away from each other. Alternatively, the spring 57 applies a force to bring the upper case 521 and the upper bobbin 533 closer to each other.

The upper bobbin 533 is fixed to the motor shaft 11. The motor 10 drives the upper bobbin 533 to rotate.

The housing assembly 51 is projected with a projection 5221 toward the inside of the housing chamber 511. The minimum distance from the protruding portion 5221 to the inner threading hole 5351 is 3mm or more.

The hole wall of the outer threading hole 544 is formed with a protruding portion 5221 protruding toward the inside of the housing chamber 511. Specifically, the outer threading hole 544 corresponds to two protruding portions 5221. Two protrusions 5221 are located on both sides of the outer threading hole 544 and are arranged in the circumferential direction of the central axis 102. I.e., two protrusions 5221 are located at the left and right sides of the outer threading hole 544 instead of the upper and lower sides.

As a specific embodiment, the outlet sleeve 54 is formed with an outer threading aperture 544. The distance from the outlet ferrule 54 to the spool 53 is less than 3mm. The distance from the outlet grommet 54 to the flange portion 532 is 3mm or less. Specifically, the distance from the outlet grommet 54 to the intermediate flange portion 535 is 3mm or less.

The end of the grass rope 101 penetrating from the outer threading hole 544 into the housing chamber 511 is not easily deviated, and can be smoothly inserted into the inner threading hole 5351.

The outlet clasp 54 projects at least partially toward the spool 53. The outlet grommet 54 is formed with two projections 542 protruding toward the spool 53. Two projections 542 are provided on both sides of the viewing aperture. The two projections 542 are arranged along the circumference of the central axis 102.

The projection 542 is located between the upper and lower surfaces of the intermediate flange portion 535. The dimension of the projection 542 in the direction of the central axis 102 is smaller than the dimension of the intermediate flange portion 535 in the direction of the central axis 102.

The outer threading aperture 544 is a kidney-shaped aperture. The dimension of the outer threading aperture 544 in a direction along the central axis 102 is defined as the height of the outer threading aperture 544. The dimension of the outer threading hole 544 in the direction of the rental and central axis 102 is defined as the width of the outer threading hole 544. The dimension of the outer threading hole 544 in the extending direction is defined as the depth of the outer threading hole 544.

The distance between the two projections 542 is the same as the width of the outer threading aperture 544. The width of the outer threading aperture 544 is greater than the height of the outer threading aperture 544.

The outlet grommet 54 is formed with a notch 543 on a side of the projection of the outlet grommet 54 in a plane perpendicular to the center axis 102 near the bobbin 53. The outlet grommet 54 is U-shaped.

The outlet ferrule 54 includes a body 541 and a projection 542. The body 541 is formed with an outer threading hole 544. The projection 542 extends outwardly from the body 541. Two projections 542 extend outwardly from both ends of the same side of the body 541.

The distance from the outlet grommet 54 to the flange portion 532 is less than the maximum outer diameter of the grass rope 101.

As shown in fig. 6, 7 and 12, grass-cutting head 50 also includes a knocking cap 55. Specifically, the knocking cap 55 is rotatably coupled to the lower housing 522 such that the knocking cap 55 and the lower housing 522 can rotate relative to each other. At the same time, the cap 55 and the lower housing 522 are moved synchronously in the axial direction, that is, the position of the cap 55 is changed, and the lower housing 522 is also moved together, that is, the housing 52 is changed in axial position by knocking the cap 55.

The knocking cap 55 includes a contact portion 551 protruding with the outer surface of the case 52.

The ratio of the projected area of the projection of the contact portion 551 on the plane perpendicular to the central axis 102 to the projected area of the housing 52 on the plane perpendicular to the central axis 102 is 0.3 or more and 1 or less.

The surface of the contact portion 551 is a smooth curved surface. The projection of the contact 551 on a plane perpendicular to the central axis 102 is circular.

The ratio of the projected area of the contact portion 551 on the plane perpendicular to the central axis 102 to the projected area of the bobbin 53 on the plane perpendicular to the central axis 102 is 0.5 or more and 1.2 or less.

The ratio of the largest dimension of the contact portion 551 in the radial direction of the central axis 102 to the largest dimension of the bobbin 53 in the radial direction of the central axis 102 is 0.7 or more and 1.1 or less.

The contact portion 551 has a larger area, and when the user deflects the grass cutting head 50 to perform knocking, the contact portion can still be ensured to be in contact with the ground before the contact of the housing 52 with the ground, so that the abrasion of the housing 52 can be effectively avoided.

A bearing 56 is provided between the knocking cap 55 and the lower housing 522, and the bearing 56 connects the knocking cap 55 and the lower housing 522. The lower housing 522 is formed with a mounting groove 5222. More specifically, the protruding portion 5221 is formed with the mounting groove 5222. The bearing 56 is disposed within the mounting groove 5222. The bearing 56 connects the knocking cap 55 and the lower housing 522.

The knocking cap 55 is free to rotate relative to the lower housing 522 by the bearings 56, reducing wear of the grass cutting head 50. The spring 57 applies a force to the housing 52 to move the housing 52 downward relative to the spool 53. A shock absorbing member for reducing an impact between the upper case 521 and the bobbin 53 is provided between the upper case 521 and the bobbin 53. Specifically, the shock absorbing member is a rubber washer.

As shown in fig. 22 and 23, a grass-cutting head 201 includes a spool 203 and a housing assembly. The housing assembly is formed with a housing cavity. The housing assembly is formed with an outer threading aperture. The straw rope can penetrate into the cavity of the shell from the outside of the shell component. The spool 203 is at least partially disposed within the housing cavity. Spool 203 is rotatable about a central axis relative to the housing assembly.

Specifically, the housing assembly includes a housing 202 and an outlet ferrule 204. The housing 202 is formed with a housing cavity. The outlet button sleeve 204 is formed with an outer threading hole. The outlet ferrule 204 is secured to the housing 202. The housing 202 includes an upper housing 202a and a lower housing 202b. Spool 203 is located between upper housing 202a and lower housing 202b.

The housing 202 in fig. 22 is identical in construction to the housing 52 in fig. 1-12. The grass cutting head 201 in fig. 22 differs from the grass cutting head 50 in fig. 1 to 12 in that the spool 203 and the outlet clasp 204 in fig. 22 differ from the spool 53 and the outlet clasp 54 in fig. 1 to 12.

Specifically, the spool 203 is formed with a projection 203a toward the housing 202. While the outlet ferrule 204 does not have a bump. Specifically, the spool 203 includes a winding portion 203b and a flange portion 203c. The inner threading hole 203d is provided in the flange portion 203c. The projection 203a is provided on the flange 203c. Two bosses 203a are located on both sides of the inner threading hole 203 d. The protrusion 203a guides the end of the grass mowing rope entering the housing cavity, so that the grass mowing rope can be directly inserted into the inner threading hole 203 d.

The minimum distance from the protruding block 203a to the outer threading hole is less than or equal to 3mm. The minimum distance from the protrusion 203a to the presence of the collar 204 is less than or equal to 3mm. The minimum distance from the protruding block 203a to the outer threading hole is smaller than or equal to the maximum outer diameter of the straw rope. The maximum outer diameter of the grass rope means the maximum dimension of the grass rope in a section perpendicular to the extending direction of the grass rope.

As an alternative embodiment, the grass cutting head in fig. 24 differs from the grass cutting head 50 in fig. 1 to 12 in that: the tab 303 is formed by the housing 302 rather than by the outlet ferrule. Spool 301 is identical in structure to spool 53.

As shown in fig. 25 and 26, the spool 401 includes two winding portions and three flange portions. Specifically, the spool 401 includes an upper winding portion, a lower winding portion, an intermediate flange portion, an upper flange portion, and a lower flange portion. The upper winding part is used for winding the grass mowing rope. The lower winding part is used for winding the grass mowing rope. The upper flange part, the lower flange part and the middle flange part limit the positions of the grass ropes. The upper flange portion is connected to an upper end of the upper winding portion. The lower flange portion is connected to a lower end of the lower winding portion. The intermediate flange portion is located between the upper winding portion and the lower winding portion. Specifically, the middle flange portion is formed with an inner threading hole through which the grass rope is threaded. The overall structure of the spool 401 shown in fig. 25 and 26 is the same as that of the spool 53 in fig. 1 to 12. The other differences are that: the components that make up spool 401 are structurally different.

Specifically, spool 401 includes a first piece 403 and a second piece 402. The first piece 403 and the second piece 402 combine to form the spool 401. The first piece 403 forms a winding portion and a flange portion. Specifically, the first member 403 forms an upper winding portion, a lower winding portion, an intermediate flange portion, an upper flange portion, and a lower flange portion.

Spool 401 is formed with at least two interdigitated threading channels 404. Spool 401 is formed with 3 threading channels 404. The first piece 403 and the second piece 402 combine to form a threading channel 404. The two ends of the threading channel 404 define an inner threading aperture. Specifically, two intersecting threading channels 404 are formed by the combination of a first piece 403 and a second piece 402 at the intersecting portions thereof. The first part 403 surrounds the second part 402. The first part 403 is arranged at the outer periphery of the second part 402.

The spool 401 is constructed in a manner that enables the spool to be formed by a simple mold construction, and is simple and quick to manufacture.

As shown in fig. 27 to 29, the spool 501 is formed with at least one winding portion 504 around which the grass rope is wound, and two flange portions 505a, 505b provided at both ends of the winding portion 504. The inner threading holes 507 are provided in the flange portions 505a, 505b.

Specifically, the spool 501 is formed with one winding portion 504. The upper flange portions 505a, 505b and the lower flange portions 505a, 505b are located at both ends of the winding portion 504, respectively. The inner threading holes 507 are provided in the upper flange portions 505a, 505b.

Spool 501 includes a first piece 502 and a second piece 503. The first piece 502 and the second piece 503 combine to form a spool 501. The first part 502 forms a winding portion 504. The first part 502 and the second part 503 together form upper flange portions 505a, 505b. The first part 502 and the second part 503 are aligned along the rotational axis of the spool 501. The second part 503 is located at an upper portion of the first part 502.

The first part 502 and the second part 503 are formed with threading channels 506. The first piece 502 and the second piece 503 are combined to form at least two mutually intersecting threading channels 506. Specifically, the first piece 502 and the second piece 503 combine to form three threading channels 506 that can be arbitrarily two interdigitated. The threading channel 506 defines an inner threading aperture 507 at both ends.

As shown in fig. 30-32, the grass cutting head 601 includes a spool 603 and a housing assembly. The shell component is provided with a shell cavity and an outer threading hole which can enable the straw rope to penetrate into the shell cavity from the outside of the shell component; the housing assembly includes a housing 602 and an outlet ferrule 604. The housing 602 is formed with a housing cavity. Spool 603 is at least partially located within the housing cavity. The housing 602 includes an upper housing 602a and a lower housing 602b. The outlet ferrule 604 is formed with an outer threading aperture. A spring 605 is provided between the lower housing 602b and the spool 603.

The spool 603 and housing assembly of fig. 30-32 are identical in construction to the spool 53 and housing assembly 51 of fig. 1-12. The grass cutting head 601 in fig. 30 to 32 differs from the grass cutting head 50 in fig. 1 to 12 in that: the grass cutting head 601 also includes an elastic member 603a. The elastic member 603a serves as a driving member. Specifically, the elastic member 603a is a spring plate. The elastic member 603a is fixed to the bottom of the spool 603. The elastic member 603a connects the spool 603 and the housing assembly. One end of the elastic member 603a contacts the lower housing 602b, and applies a force to the lower housing 602b to enable relative rotation with respect to the spool 603 so that the first positioning surface and the second positioning surface approach each other. Specifically, when the elastic member 603a is compressed, the elastic member 603 generates at least one component force capable of rotating the lower housing 602b with respect to the spool 603. Thereby driving the housing assembly to rotate relative to the spool 603, the spool 603 preventing the housing assembly from rotating when the first locating surface contacts the second locating surface. The elastic member 603 drives the housing 602 to rotate relative to the spool 603, and when the first positioning surface and the second positioning surface are in contact, the outer threading hole is aligned with the inner threading hole. The automatic alignment of the outer threading hole and the inner threading hole is convenient for users to use. The user can be very convenient insert the rope of beating grass in the interior through wires hole through outer through wires hole.

As an alternative embodiment, torsion springs can also be used as drive elements. The torsion spring contacts the spool and the housing applies a force to the housing that causes it to rotate relative to the spool.

As an alternative embodiment, the drive member drives the spool in rotation relative to the housing assembly. The drive member applies a force to the spool to drive the spool to rotate relative to the housing assembly.

As an alternative embodiment, the drive member drives both the spool and the housing assembly. The driving member applies a force to the spool and the housing assembly that brings the first and second locating surfaces toward each other.

As shown in fig. 33-36, the grass-cutting head 701 includes a housing assembly. The housing assembly is formed with a housing cavity. The housing assembly is formed with an outer threading aperture. The straw rope can penetrate into the cavity of the shell from the outside of the shell component. The spool 704 is at least partially disposed within the housing cavity. The spool 704 is rotatable about a central axis relative to the housing assembly. Spool 704 is provided with an inner threading hole for a grass rope to penetrate. The inner threading hole can fix the straw rope.

Specifically, the housing assembly includes a housing 703 and an outlet grommet 705. The housing 703 is formed with a housing cavity. Housing 703 includes an upper housing 703a and a lower housing 703b. The outlet grommet 705 is formed with an outer threading hole. A wire outlet grommet 705 is fixed to the housing 703. The housing assembly is formed with a first locating surface. The spool 704 is formed with a second locating surface that mates with the first locating surface. When the first positioning surface is contacted with the second positioning surface, the inner threading hole is aligned with the outer threading hole.

Grass cutting head 701 also includes a fan 702. The fan 702 rotates in synchronization with the housing 703. The fan 702 in fig. 33-36 is identical to the fan 58 in fig. 1-12.

The grass cutting head 701 also includes a magnetic element. The magnetic member serves as a driving member. The magnetic member applies a force to the housing assembly or spool 704 that brings the first and second locating surfaces into close proximity with each other. The magnetic member applies a force to the housing assembly or spool 704 that causes relative rotation to bring the first and second locating surfaces into contact.

Specifically, the first magnetic member 707 is fixed to the housing 703. A second magnetic member 708 is secured to the spool 704. The second magnetic member 708 is opposite to the magnetic direction of the first magnetic member 707. The first magnetic member 707 and the second magnetic member 708 repel each other creating a force that rotates the spool 704 and the housing 703 relative to each other.

Specifically, housing 703 is formed with first mating teeth 703c. One end of the first mating tooth 703c is provided with a first positioning surface. The first magnetic member 707 is fixed to an end of the first mating tooth 703c remote from the first positioning surface.

The spool 704 is formed with a first engagement tooth 704a. One end of the first engagement tooth 704a is provided with a second positioning surface. A second magnetic member 708 is secured to an end of the first engagement tooth 704a remote from the second locating surface. The first mating teeth 703c of the housing assembly in fig. 33-36 are different from the first mating teeth 5211 of the housing assembly 51 in fig. 1-12 in structure, and otherwise are identical. The first engagement tooth 704a of the spool 704 in fig. 33-36 is different from the first engagement tooth 536 of the spool 53 in fig. 1-12 in structure, and otherwise is the same. The first positioning surface in fig. 33 to 36 is the same as the first positioning surface 5212 in fig. 1 to 12. The human locating surface in fig. 33 to 36 is the same as the second locating surface 5362 in fig. 1 to 12.

Specifically, the number of first engagement teeth 704a is the same as the number of inner threading holes. The number of first fitting teeth 703c is the same as the number of inner threading holes. The number of first magnetic members 707 is the same as the number of inner threading holes. The number of second magnetic elements 708 is the same as the number of inner threading holes. The number of the inner threading holes is 6.

As an alternative embodiment, the grass trimmer includes a magnetic member and a metallic member. The magnetic member is fixed to one of the bobbin and the housing, and the metal member is fixed to the other of the bobbin and the housing. The magnetic member generates attraction force to the metal member. The magnetic member drives the housing assembly or spool 704 into relative rotation so that the first and second locating surfaces contact. Automatic alignment of the inner threading hole and the outer threading hole is realized.

As shown in fig. 37 and 38, grass-cutting head 801 includes housing 802, spool 803, knocking cap 807, knocking cap support 806, and spring 805. The spool 803 is used to wind a straw rope. The spool 803 is at least partially disposed within the housing 802 and is rotatable relative to the housing 802 about a central axis. The housing 802 includes an upper housing 802a and a lower housing 802b. Spool 803 is located between upper housing 802a and lower housing 802b. The upper housing 802a is formed with first mating teeth. The knocking cap support 806 is formed with first engagement teeth that mate with the first mating teeth. Specifically, first engagement teeth are provided on an inner surface of knocking cap support 806. The outlet ferrule 804 secures the housing 802. The outlet grommet 804 is formed with an outer threading hole.

Spring 805 is disposed between knocking cap support 806 and upper housing 802 a. The knocking cap 807 is rotatably coupled to a knocking cap support 806. The knocking cap 807 includes a contact portion 807a protruding from the outer surface of the housing 802. The contact portion 807a is for contact with the ground. The lower housing 802b is formed with an outlet. The knocking cap 807 is exposed outside the housing 802 from the outlet. The bobbin 803 is formed with a guide portion. The knocking cap support 806 is formed with a mating portion. The mating portion is provided on the outer surface of the knocking cap support 806. The guide and mating portions cooperate to maintain the spool 803 and knocking cap support 806 in synchronous rotation and slidable along the central axis.

The ratio of the projected area of the contact portion 807a on the plane perpendicular to the central axis to the projected area of the housing 802 on the plane perpendicular to the central axis is 0.3 or more and 1 or less. The surface of the contact portion 807a is a smooth curved surface. The contact portion 807a is circular in projection on a plane perpendicular to the central axis.

As an alternative, the knocking cap support may be integral with the spool. I.e. the knocking cap is rotatably connected to the spool.

As shown in fig. 39 and 40, the grass cutting head 210 is used for mounting and accommodating a grass cutting rope, a part of which is accommodated inside the grass cutting head 210, and a part of which extends out of the grass cutting head 210 for cutting vegetation when the grass cutting head 210 rotates.

The motor 220 can drive the grass-cutting head 210 to rotate around the central axis 210a, thereby driving the grass-cutting rope to rotate for cutting vegetation. Specifically, motor 220 includes a motor shaft 220a. The motor shaft 220a is connected to the grass-cutting head 210 to drive the grass-cutting head 210 to rotate.

Grass cutting head 210 includes spool 260 and housing 250. The spool 260 is for winding the grass-cutting rope and is accommodated in the housing 250, and the spool 260 is provided with an inner threading hole 260a for fixing the grass-cutting rope or passing the grass-cutting rope therethrough. The housing 250 is formed with an outer threading hole 250a through which the grass rope passes. As one implementation, the housing 250 includes an upper housing 250b and a lower housing 250c, which enables the housing 250 to be easily assembled with the spool 260 and also facilitates a user to open the housing 250 to detect conditions inside the housing 250.

Grass cutting head 210 also includes a spring 270 that applies a force between housing 250 and spool 260. The spring 270 applies a force that moves the spool 260 away from the lower housing 250 c.

When the user needs to supplement a new grass mowing rope, the user can align the inner threading hole 260a with the outer threading hole 250a, then pass the grass mowing rope through the outer threading hole 250a and then enter the inner threading hole 260a, and at the moment, the limiting effect of the outer threading hole 250a on the grass mowing rope can enable the grass mowing rope to be gradually wound on the spool 260 along with the movement of the outer threading hole 250a relative to the spool 260 as long as the spool 260 and the housing 250 can relatively move. The motor shaft 220a is connected to the spool 260, which directly rotates the spool 260 about the central axis 210 a. Spool 260 and housing 250 form a rotational connection.

The lawnmower further comprises a damping device 240, in particular the damping device 240 comprises a friction member 230. The friction member 230 is movable in a direction 230 a. When the friction member 230 moves to a position contacting the housing 250, the friction member 230 causes the housing 250 to rotate relative to the spool 260 due to contact friction, and as the friction force increases, the spool 260 and the housing 250 are caused to rotate relative to each other, thereby providing the lawnmower with an automatic winding mode. The motor 220 drives at least one of the spool 260 and the housing 250 to rotate the spool 260 and the housing 250 relative to each other to automatically wind the mowing cord onto the spool 260. Specifically, the spool 260 and the housing 250 are rotated relatively by the driving of the motor 220 and the friction member 230 to automatically wind the wire to the spool 260. The friction member 230 does not completely prevent the rotation of the housing 250, but slows down the rotation of the housing 250, thereby effecting the relative rotation of the spool 260 and the housing 250.

Of course, when the spool 260 is wound with enough grass line and the portion of the housing 250 exposed is insufficient to cut vegetation, the relative rotation of the spool 260 and the housing 250 may also be used to effect automatic payout.

In this embodiment, the friction member 230 acts to dampen the rotation of the housing 250 to slow the rotation of the housing 250 and thereby produce a relative rotation with the spool 260. The user can implement the cutting mode and the automatic winding mode of the mower by directly or indirectly operating the friction member 230, and of course, the user may first place the friction member 230 in a corresponding state to the desired mode and then activate the motor 220.

As shown in fig. 41 and 42, as one embodiment, the grass-cutting head 310 includes a spool 350 and a housing 320. The housing 320 includes an upper housing 320a and a lower housing 320b.

In contrast to the damper 240 of fig. 39 and 40, the damper 340 of fig. 41 and 42 includes a stopper 330, the stopper 330 serving to prevent the rotation of the housing 320. The housing 320 is formed with a stopper groove 320c that cooperates with the stopper 330. Specifically, the stopper groove 320c is provided in the upper case 320a. In the automatic winding mode, the stopper 330 is inserted into the stopper groove 320c to be engaged with the stopper groove, so that the rotation of the housing 320 with respect to the entire grass cutter is completely prevented. The relative rotation of spool 350 and housing 320 is also accomplished to effect automatic winding of the mowing cord onto spool 350. The automatic winding function is realized.

The stopper 330 also serves to damp the rotation of the housing 320, except that the damping of the friction member 230 is to slow down the movement trend, while the damping of the stopper 330 is to limit the displacement, and both the slow down movement trend and the limit displacement are defined as damping; both the friction member 230 and the stopper 330 can be considered a damping device 340.

In fig. 43, a motor shaft 460a of a motor 460 is shown driving a housing 420 to damp a spool 430 using a one-way bearing 440.

As shown in fig. 43, the grass-cutting head 410 includes a spool 430 and a housing 420. The motor housing 450 accommodates the motor 460, and the one-way bearing 440 is provided between the spool 430 and the motor housing 450 such that the spool 430 can only rotate in one direction with respect to the motor housing 450. Specifically, the motor housing 450 is formed with a boss portion. The inner ring of the one-way bearing 440 is sleeved on the outer circumference of the boss portion. The inner race of the one-way bearing 440 is fixedly coupled to the motor housing 450. The outer race of the one-way bearing 440 can only rotate in one direction relative to the motor housing 450. Rotation of the outer race of the one-way bearing 440 in the other direction relative to the motor housing 450 is prevented. Spool 430 is sleeved on the outer periphery of one-way bearing 440. The one-way bearing 440 allows the spool 430 to rotate in only one direction relative to the motor housing 450.

The motor shaft 460a passes through the bobbins 430 but does not directly drive the bobbins 430, i.e., torque is not directly transferred between the bobbins 430; the motor shaft 460a is non-rotatably connected to the housing 420 to directly drive the housing 420.

As can be seen from the foregoing description of the scheme and principles, if the motor 460 rotates in the forward direction, the spool 430 and the housing 420 can rotate in synchronization to perform the cutting mode, the spool 430 remains stationary while the motor 460 rotates in the reverse direction. The spool 430 and the housing 420 may be rotated relative to each other to perform an automatic winding mode.

It will be appreciated that the damping means may not only dampen the resistance of the housing to its rotation, but may also apply a resistance to the spool to dampen its rotation.

As another embodiment, the damping device may apply a damping effect to both the spool and the housing. In particular, the damping device may comprise a first damping member and a second damping member. The first damping member applies a first resistance to the spool that damps the rotation of the spool. The second damping member applies a second resistance to the housing that dampens the rotation of the housing. The housing and the spool are allowed to rotate relative to each other due to the first resistance and the second resistance.

The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be appreciated by persons skilled in the art that the above embodiments are not intended to limit the invention in any way, and that all technical solutions obtained by means of equivalent substitutions or equivalent transformations fall within the scope of the invention.

Claims

1. An externally inserted wound grass cutting head comprising:

a housing having a housing cavity formed therein and having an outer threading hole through which the straw rope is inserted from the outside of the housing into the housing cavity;

A spool at least partially disposed within the housing and rotatable relative to the housing about a central axis; the spool is provided with an inner threading hole for the grass mowing rope to penetrate;

Wherein the spool comprises an upper spool and a lower spool; the lower spool is coupled to the upper spool;

The upper bobbin includes:

an upper winding part for winding the grass mowing rope;

an upper spool upper flange portion connected to an upper end of the upper winding portion;

an upper spool lower flange portion connected to a lower end of the upper winding portion;

the lower spool includes:

a lower winding part for winding the grass mowing rope;

a lower spool upper flange portion connected to an upper end of the lower winding portion;

a lower spool lower flange portion connected to a lower end of the lower winding portion;

the upper spool and the lower spool are combined to form a threading channel for the grass mowing rope to penetrate through the spool.

2. The plug-in wire wound grass cutting head as claimed in claim 1, wherein:

The threading channel extends along a curve.

3. The plug-in wire wound grass cutting head as claimed in claim 1, wherein:

The upper spool and the lower spool combine to form at least two of the threading channels that intersect one another.

4. An externally inserted wound grass cutting head as claimed in claim 3, wherein:

The upper spool and the lower spool are combined to form three threading channels capable of being intersected with each other at random, and the three threading channels are distributed around the central axis.

5. The plug-in wire wound grass cutting head as claimed in claim 1, wherein:

The shell comprises an upper shell and a lower shell;

The spool is arranged between the upper shell and the lower shell;

the lower shell is provided with a protruding part protruding towards the upper shell;

the lower spool is formed with a groove matched with the convex part;

The projection cooperates with the recess to guide movement of the housing relative to the spool along the central axis.

6. An externally inserted wound grass cutting head as claimed in claim 5, wherein:

The convex part is provided with a mounting groove;

The externally inserted winding grass cutting head also comprises a bearing and a knocking cap;

the bearing is arranged in the mounting groove;

The bearing connects the knocking cap and the lower housing.

7. An externally inserted wound grass cutting head as claimed in claim 5, wherein:

the groove penetrates through the lower spool along the central axis;

the externally inserted winding grass cutting head also comprises a spring;

The spring passes through the groove and is arranged between the upper spool and the lower shell;

the spring applies a force that moves the upper spool and the lower housing away from each other.

8. An externally inserted wound grass cutting head as claimed in claim 5, wherein:

the upper shell is provided with first matching teeth;

The spool is formed with first engagement teeth that mate with the first mating teeth;

The first engagement tooth is formed with a bevel.

9. The plug-in wire wound grass cutting head as claimed in claim 1, wherein:

the externally inserted winding grass cutting head also comprises an outlet buckle sleeve;

the wire outlet buckle sleeve is fixed to the shell and used for the grass mowing rope to penetrate out of the shell.

10. A grass trimmer comprising:

an external wound grass cutting head as claimed in any one of claims 1 to 9;

The motor drives the externally inserted winding grass cutting head to rotate; the grass trimmer has an automatic winding mode in which the motor drives at least one of the spool and the housing to rotate the spool and the housing relative to each other to automatically wind the grass rope onto the spool;

And a damping device for damping at least one of the spool and the housing to place the mower in the automatic winding mode.

11. A lawnmower as claimed in claim 10 wherein:

the motor is provided with a motor shaft;

The upper spool is fixed to a motor shaft of the motor.

12. A grass trimmer, comprising:

an external wound grass cutting head as claimed in any one of claims 1 to 9;

The motor drives the externally inserted winding grass cutting head to rotate;

the grass cutting machine is provided with an automatic winding mode and a cutting mode;

in the cutting mode, the motor rotates positively to drive the externally inserted winding grass cutting head to rotate along one direction;

in the automatic winding mode, the motor rotates in reverse to drive one of the spool or the housing in an opposite direction relative to the other.