Grass trimming head and grass trimmer having the same

Patent metadata

Field	Value
Publication number	US-2023112033-A1
Application number	US-202218078961-A
Country	US
Kind code	A1
Filing date	Dec 11, 2022
Priority date	Aug 7, 2017
Publication date	Apr 13, 2023
Grant date	—

Abstract

A grass trimming head includes a housing assembly and a spool. The housing assembly is formed with a housing cavity and an outer aperture for allowing a cutting line to be inserted from an outside of the housing assembly into the housing cavity. At least a portion of the spool is arranged inside the housing cavity, and the spool is rotatable with respect to the housing assembly about a central axis. The spool is formed with an inner aperture for allowing the cutting line to be inserted into the spool or a clamping portion configured to fix the cutting line.

First claim

What is claimed is:

1 . A power tool, comprising:
an output assembly for outputting power; a motor configured to drive the output assembly; a power source device configured to power the motor; a support member configured to support at least one of the output assembly, the motor, or the power source device; wherein the support member comprises a carbon fiber material, a ratio of a density of the support member to a tensile strength of the support member is greater than or equal to 4.5 kg/(m 3 •MPa) and less than or equal to 15 kg/(m 3 •MPa), and the support member is manufactured by a special-shaped molding process.

2 . The power tool according to claim 1 , wherein the support member further comprises a second material different from the carbon fiber material.

3 . The power tool according to claim 2 , wherein the second material is a plastic material.

4 . The power tool according to claim 3 , wherein a ratio of a weight of the carbon fiber material in the support member to a weight of the second material in the support member is greater than or equal to 0.3 and less than or equal to 0.6.

5 . The power tool according to claim 1 , wherein the density of the support member is greater than or equal to 0.9 g/cm 3 and less than or equal to 2 g/cm 3 .

6 . The power tool according to claim 5 , wherein the tensile strength of the support member is greater than or equal to 100 MPa and less than or equal to 200 MPa.

7 . The power tool according to claim 1 , wherein the support member is formed with an accommodation cavity for receiving at least part of the at least one of the output assembly, the motor, or the power source device.

8 . The power tool according to claim 1 , wherein the power tool is a lawn mower and the support member is a deck for supporting the motor or the output assembly.

9 . The power tool according to claim 1 , wherein the power tool is a snow thrower and the support member is a deck for supporting the output assembly.

10 . The power tool according to claim 1 , wherein the power tool is a grass trimmer and the support member is a housing for accommodating at least part of the motor.

11 . The power tool according to claim 1 , wherein the power tool is a garden tool.

12 . The power tool according to claim 1 , wherein the motor is an electric motor and the power source device comprises a battery pack.

13 . The power tool according to claim 1 , wherein the power tool is a long-rod type power tool and comprises a connecting rod assembly, and at least part of the output assembly is disposed at a front end of the connecting rod assembly.

14 . The power tool according to claim 1 , wherein the special-shaped molding process for manufacturing the support member is an injection molding process.

15 . A power equipment, comprising:
a motor configured to drive an output assembly; a power source device configured to power the motor; and a housing configured to accommodate at least part of the motor; wherein at least one element of the power equipment comprises a carbon fiber composite material, and the carbon fiber composite material comprises a carbon fiber material and a second material different from the carbon fiber material.

16 . The power equipment according to claim 15 , wherein the at least one element is manufactured using an injection molding process.

17 . The power equipment according to claim 15 , wherein the motor is an electric motor and the power source device comprises a battery pack.

18 . A power tool, comprising:
an output assembly for outputting power; a motor configured to drive the output assembly; a power source device configured to power the motor; and a housing configured to accommodate at least part of the motor; wherein at least one element of the power tool comprises a carbon fiber composite material, and a ratio of a density of the at least one element to a tensile strength of the at least one element is greater than or equal to 4.5 kg/(m 3 •MPa) and less than or equal to 15 kg/(m 3 •MPa).

19 . The power tool according to claim 18 , wherein the at least one element is manufactured using an injection molding process.

20 . The power tool according to claim 18 , wherein the power tool is a long-rod type power tool and comprises a connecting rod assembly, the connecting rod assembly comprises a first connecting rod, a second connecting rod, and a connecting member configured to connect the first connecting rod to the second connecting rod, and the at least one element comprises the connecting member, and the connecting member comprises the carbon fiber composite material.

Assignees

• Nanjing Chervon Ind Co Ltd

Inventors

• Guo Jianpeng
• Yamaoka toshinari
• Nie Fangjie
• Zhang Qi
• Li Zongjing
• Wang Fei
• Xu Lanxi

Classifications

• A01D34/90 Primary

  for carrying by the operator · CPC title

• A01D34/416

  Flexible line cutters · CPC title

• A01D2101/00

  Lawn-mowers · CPC title

• A01D34/4166 Primary

  Mounting or replacement of the lines · CPC title