Grass trimmer

Patent metadata

Field	Value
Publication number	US-10485165-B2
Application number	US-201514945965-A
Country	US
Kind code	B2
Filing date	Nov 19, 2015
Priority date	Nov 25, 2014
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

A grass trimmer includes a cutting head for mounting a cutting member, a drive head having a output shaft for driving the cutting head to rotate, and an anti-winding member for preventing the output shaft from being wound to by grass. The drive head includes a drive device to drive the output shaft and a head housing for accommodating the drive device. The output shaft connects to the cutting head and passes through the anti-winding member and the anti-winding member is mounted to the cutting head so as to rotate with the cutting head and is disposed between the cutting head and the head housing so as to fill the space between the cutting head and the head housing.

First claim

What is claimed is:

1. A grass trimmer, comprising:
a cutting head for mounting a cutting member;
a drive head having an output shaft for driving the cutting head to rotate;
a power source device for providing power to the drive head;
a handle device configured to be operated by a user;
a connector for connecting the drive head and the power source device; and
an anti-winding member for preventing the output shaft from being wound to by grass or the like being cut by the cutting member;
wherein the drive head comprises:
a motor for driving the output shaft; and
a head housing for accommodating the motor;
wherein the cutting head forms a mounting hole and has a top end which is contacted with the anti-winding member,
wherein the handle device is disposed between the drive head and the power source device,
wherein the anti-winding member forms a centre hole for being passed through by the output shaft which is inserted into the mounting hole and the anti-winding member is mounted to the cutting head so as to rotate with the cutting head and is disposed between the cutting head and the head housing so as to fill the space between the cutting head and the head housing,
wherein the cutting head comprises a plurality of top ribs disposed on a top end of the cutting head, protruding from the top end of the cutting head, and extending towards the anti-winding member for generating a centrifugal airflow when the cutting head rotates,
wherein the anti-winding member includes at least two fixing holes and at least two of the plurality of top ribs include a fixing aperture, and
the grass trimmer further comprises fasteners mounted to the fixing holes and the fixing apertures thereby fixing the anti-winding member to the top ribs.

2. The grass trimmer of claim 1 , wherein the anti-winding member comprises a plurality of peripheral ribs protruding radially outward from a peripheral surface of the anti-winding member, when the anti-winding member rotates with the cutting head, both the peripheral ribs and the top ribs generate the centrifugal airflow.

3. The grass trimmer of claim 2 , wherein the peripheral ribs are formed along a direction which inclines relative to the output shaft.

4. The grass trimmer of claim 3 , wherein the peripheral surface of the anti-winding member comprises an annular inclined surface and at least a portion of the peripheral ribs protrude radially outward from the inclined surface.

5. The grass trimmer of claim 2 , wherein the drive head further comprises a fan for blowing airflow to the anti-winding member and the fan is disposed in the head housing and driven by the motor.

6. The grass trimmer of claim 5 , wherein the motor comprises a stator connected to the housing and a rotor for rotating with the output shaft relative to the stator wherein the rotor comprises a sleeve for accommodating the stator and the fan is mounted with the sleeve so as to rotate with the sleeve.

7. The grass trimmer of claim 6 , wherein the fan is an axial fan which is disposed on an end of the sleeve.

8. A grass trimmer, comprising:
a cutting head for mounting a cutting member;
a drive head having a output shaft for driving the cutting head to rotate; and
an anti-winding member for preventing the output shaft from being wound to by grass or the like being cut via use of the cutting head,
wherein the drive head comprises a drive device for driving the output shaft and a head housing for accommodating the drive device and wherein the drive device is disposed in the head housing,
wherein the output shaft connects to the cutting head and passes through the anti-winding member and the anti-winding member is mounted to the cutting head so as to rotate with the cutting head and is disposed between the cutting head and the head housing so as to fill the space between the cutting head and the head housing,
wherein the cutting head comprises a plurality of top ribs disposed on a top end of the cutting head and extending towards the anti-winding member for generating a centrifugal airflow, and
wherein the anti-winding member comprises at least two fixing holes and at least two of the top ribs include a fixing aperture, and the grass trimmer further comprises fasteners coupling the fixing holes and the fixing apertures to mount the anti-winding member to the top ribs.

9. The grass trimmer of claim 8 , wherein the cutting head is provided with a mounting hole and the output shaft inserts in the mounting hole.

10. The grass trimmer of claim 9 , wherein the anti-winding member is provided with a centre hole and the output shaft passes through the centre hole.

11. The grass trimmer of claim 8 , wherein the cutting head has a top end which is contacted with the anti-winding member.

12. The grass trimmer of claim 11 , wherein the anti-winding member comprises a top end and a bottom end and the top end is bigger than the bottom end in the radial direction of the output shaft.

13. The grass trimmer of claim 11 , wherein the anti-winding member comprises a plurality of peripheral ribs for generating centrifugal airflow and the peripheral ribs protrude radially outward from a peripheral surface of the anti-winding member.

14. The grass trimmer of claim 11 , wherein the plurality of top ribs extend toward the anti-winding member.

15. The grass trimmer of claim 14 , wherein the plurality of top ribs have a top end which is contacted with a bottom end of the anti-winding member and the anti-winding member is provided with a recess on the bottom end for accepting the top ribs.

16. The grass trimmer of claim 14 , wherein the anti-winding member is at least partially accommodated within the head housing.

17. The grass trimmer of claim 8 , wherein the drive device comprises a stator connected to the head housing and a rotor connected to the output shaft and the rotor comprises a sleeve for accommodating the stator.

Assignees

• Chervon Ip Ltd
• Chervon Hk Ltd

Inventors

• Yuan Feng
• Peng Ming
• Guo Jianpeng
• Tang Zichun

Classifications

• A01D34/90

  for carrying by the operator · CPC title

• A01D34/4165 Primary

  Mounting of the cutter head · CPC title

• A01D34/81

  Casings; Housings (A01D34/71 takes precedence) · CPC title

• B25F5/008

  Cooling means · CPC title