US-12622350-B2 - Grass trimming head and grass trimmer having the same

US12622350B2US 12622350 B2US12622350 B2US 12622350B2US-12622350-B2

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.

Inventors

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

Assignees

NANJING CHERVON INDUSTRY CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20221211
Priority Date: 20170807

Claims (17)

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).
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 support member is injection molded.
15 . 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).
16 . The power tool according to claim 15 , wherein the at least one element is injection molded.
17 . The power tool according to claim 15 , 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.

Description

RELATED APPLICATION INFORMATION The present application is a continuation-in-part of U.S. application Ser. No. 17/402,976, filed Aug. 16, 2021, now U.S. Pat. No. 11,910,743 B2, which application is a continuation of U.S. application Ser. No. 17/066,502, filed Oct. 9, 2020, now U.S. Pat. No. 11,503,759 B2 which application is a continuation of U.S. application Ser. No. 16/781,147, filed Feb. 4, 2020, now U.S. Pat. No. 10,856,466 B2 which application claims the benefit of International Application Number PCT/CN2018/096413, filed on Jul. 20, 2018, through which this application claims the benefit of Chinese Patent Application No. 201720979787.X, filed on Aug. 7, 2017, and Chinese Patent Application No. 201720979716.X, filed on Aug. 7, 2017. The present application also claims the benefit of Chinese Patent Application No. 201821584956.0, filed on Sep. 27, 2018, Chinese Patent Application No. 201821889111.2, filed on Nov. 15, 2018, Chinese Patent Application No. 202210517136.4, filed on May 13, 2022, and Chinese Patent Application No. 202210517129.4, filed on May 13, 2022. Each of the above publications from which priority is claimed is incorporated herein by reference in its entirety. TECHNICAL FIELD The present disclosure relates to a grass trimming head and a grass trimmer having the same. BACKGROUND A grass trimmer is a gardening tool and used to trim the lawn. The grass trimmer includes a grass trimming head. The grass trimming head is rotated at a high speed to drive a cutting line mounted on the grass trimming head to rotate, realizing the cutting function. The grass trimming head includes a spool allowing the cutting line to be wound thereon. During the cutting operation, the cutting line is worn away gradually due to wear. After operating for a period, it is needed to change a new cutting line and wind the new cutting line around the spool. For the existing grass trimming head, the spool needs to be disassembled to wind the cutting line around the spool. The winding manner is time consuming and laborious, and the situation of blocking the cutting line is more likely to occur. SUMMARY In order to solve the shortcomings of the related art, an object of the present disclosure is to provide a grass trimming head capable of conveniently winding and a grass trimmer having the same. In order to achieve this object, the technical scheme adopted by the present disclosure is as follows. A grass trimming head, includes a housing and a spool. The housing assembly is formed with a housing cavity and provided with 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. And the spool is provided 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. In one example, the spool includes an upper spool portion and a lower spool portion around. The first flange portion is connected to an upper end of the upper winding portion. The second flange portion is connected to a lower end of the upper winding portion. The lower spool portion includes a lower winding portion, a third flange portion and a fourth flange portion. The lower winding portion is configured for winding the cutting line. The third flange portion is connected to an upper end of the lower winding portion. And the fourth flange portion is connected to a lower end of the lower winding portion. The upper spool portion is coupled to the lower spool portion to form a line guide passage configured for the cutting line passing through the spool. In one example, the line guide passage extends along a curved line. In one example, the upper spool portion is coupled to the lower spool portion to form at least two line guide passages intersected with each other. In one example, the upper spool portion is coupled to the lower spool portion to form three line guide passages. Any two of the three line guide passages are intersected with each other, and the three line guide passages are arranged around the central axis. In one example, the housing assembly includes an upper housing and a lower housing. The spool is arranged between the upper housing and the lower housing. The lower housing is provided with a protrusion portion protruding towards the upper housing, and the lower spool portion is formed with a groove matched with the protrusion portion. And the protrusion portion is matched with the groove to guide the housing assembly to move with respect to the spool along the central axis. In one example, the grass trimming head further includes a bearing and a knocking cap. The protrusion portion is formed with a mounting groove. The bearing is arranged inside the mounting groove, and the bearing is connected to the knocking cap and the lower housing. In one example,