Grass Trimmer

Patent metadata

Field	Value
Publication number	US-2020008348-A1
Application number	US-201916577063-A
Country	US
Kind code	A1
Filing date	Sep 20, 2019
Priority date	Jan 22, 2016
Publication date	Jan 9, 2020
Grant date	—

Abstract

A grass trimmer includes a trimming head, a driving device for driving the trimming head to rotate so as to cut vegetation and an operating device for a user to operate so as to control the driving device. The trimming head includes a spool and a line holding member, the spool is used to wind a cutting line, and the line holding member is formed with a line holding structure. The driving device includes a motor. The grass trimmer has an auto-winding mode. In the auto-winding mode, the motor drives at least one of the spool and the line holding member to make the spool and the line holding member rotate relatively so that the cutting line is wound on the spool automatically.

First claim

What is claimed is:

1 . A grass trimmer, comprising:
a trimming head; and a motor for driving the trimming head; wherein the trimming head comprises: a housing formed with a housing cavity; two eyelet members connected to the housing and each eyelet member defining an outer aperture for allowing a cutting line to be inserted from outside of the housing into the housing cavity; and a spool at least partially disposed in the housing cavity and rotatable relative to the housing about a central axis, wherein the spool is provided with inner apertures for the cutting line to be inserted into the spool; wherein the spool has a line loading position relative to the housing, and the cutting line is capable of being passed through the outer apertures and the inner apertures when the spool is in the line loading position; and wherein the spool is formed with a plurality of first engaging portions arranged in a circumferential direction around the central axis, the housing is formed with a plurality of first matching portions corresponding to the plurality of first engaging portions, each of the plurality of first matching portions is formed with a first positioning surface, and each of the plurality of first engaging portions is formed with a second positioning surface, the first positioning surface is capable of engaging with the second positioning surface when the spool or the housing rotates to the line loading position, the spool is capable of being positioned in the line loading position relative to the housing without manually aligning each outer aperture with one of the inner apertures.

2 . The grass trimmer of claim 1 , wherein the trimming head further comprises:
a spring is disposed between the housing and the spool, and the spring applies a force to the spool or the housing to make the first positioning surface and the second positioning surface closer to each other.

3 . The grass trimmer of claim 2 , wherein the spool comprises:
an upper winding portion for winding the cutting line; a lower winding portion for winding the cutting line; an intermediate flange portion disposed between the upper winding portion and the lower winding portion and formed with the inner apertures for the cutting line to be inserted into the spool; an upper flange portion connected to an upper end of the upper winding portion; and a lower flange portion connected to a lower end of the lower winding portion; wherein the plurality of first engaging portions are disposed on the upper flange portion or the lower flange portion.

4 . The grass trimmer of claim 3 , wherein each eyelet member protrudes at least partially toward the spool, and a distance between each eyelet member and the intermediate flange portion is less than or equal to 3 mm.

5 . The grass trimmer of claim 1 , wherein the spool is formed with passages for the cutting line to pass through the spool, the ends of the passages are defined as the inner apertures, and the passages extends along a curve.

6 . The grass trimmer of claim 5 , wherein the spool comprises:
an upper spool provided with an upper winding portion for winding the cutting line; and a lower spool provided with a lower winding portion for winding the cutting line; wherein the upper spool and the lower spool are combined to form the passages through which the cutting line passes through the spool.

7 . The grass trimmer of claim 5 , wherein the grass trimmer has an auto-winding mode, and in the auto-winding mode, the spool is driven by the motor to rotate so as to wind the cutting line around the spool automatically.

8 . A trimming head, comprising:
a housing; eyelet members mounted to the housing and provided with outer apertures for allowing a cutting line to be inserted from outside of the housing into the housing; a spool rotatable relative to the housing about a central axis and provided with inner apertures for the cutting line to be inserted into the spool; and a driving member applying a force to the housing or the spool; wherein the spool has a line loading position relative to the housing allowing the cutting line to pass through the outer apertures and the inner apertures; and wherein the spool is formed with at least one first engaging portion arranged in a circumferential direction around the central axis, the housing is formed with at least one first matching portion that be able to cooperate with the at least one first engaging portion, the driving member is capable driving the spool to rotate to the line loading position automatically until the at least one first engaging portion is in contact with the at least one first matching portion.

9 . A trimming head, comprising:
a housing assembly formed with a housing cavity and provided with outer apertures for allowing a cutting line to be inserted from outside of the housing assembly into the housing cavity; and a spool at least partially disposed in the housing cavity and rotatable relative to the housing assembly about a central axis, wherein the spool is provided with inner apertures for the cutting line to be inserted into the spool or clamping portions for fixing the cutting line; wherein the spool has a line loading position relative to the housing assembly, and the cutting line is capable of being passed through the outer apertures and be inserted into the inner apertures or the clamping portions when the spool is in the line loading position; and wherein the spool is capable of being positioned the line loading position without manual rotation of the spool or the housing assembly.

10 . The trimming head of claim 9 , further comprising:
a driving member applying a force to the housing assembly or the spool to cause a relative rotation between the spool and the housing assembly.

11 . The trimming head of claim 10 , wherein the spool is formed with a plurality of first engaging teeth arranged in a circumferential direction around the central axis, the housing assembly is formed with a plurality of first matching teeth that cooperate with the first engaging teeth, each of the first matching teeth is formed with a first positioning surface, each of the first engaging teeth is formed with a second positioning surface, and the first positioning surface is in contact with the second positioning surface when the spool in the line loading position.

12 . The trimming head of claim 11 , wherein the driving member is a spring, the spring is disposed between the housing assembly and the spool, and the spring applies a force to the spool or the housing assembly to make the first positioning surface and the second positioning surface closer to each other.

13 . The trimming head of claim 12 , wherein each of the first matching teeth is formed with a first inclined surface inclined to a plane perpendicular to the central axis, each of the first engaging teeth is formed with a second inclined surface inclined to the plane perpendicular to the central axis, the first inclined surface and the first positioning surface are located on two sides of the first matching teeth, the second inclined surface and the second positioning surface are located on both sides of the first engaging teeth, and the first inclined surface is in contact with the second inclined surface when the first positioning surface is in contact with the second positioning surface.

14 . The trimming head of claim 12 , wherein The spool comprises:
an upper winding portion for winding the cutting line; a lower winding portion for winding the cutting line; an intermediate flange portion disposed between the upper winding portion and the lower winding portion an

Assignees

• Nanjing Chervon Ind Co Ltd
• Chervon Hk Ltd

Inventors

• Guo Jianpeng
• Li Maohui
• Nie Fangjie
• Yamaoka toshinari

Classifications

• A01D34/4166 Primary

  Mounting or replacement of the lines · CPC title

• A01D2101/00

  Lawn-mowers · CPC title

• A01D34/4162

  automatically · CPC title

• A01D34/4163

  by triggered line feedout, e.g. bump-feeding · CPC title