Grass cutting head and grass trimmer using the same

Patent metadata

Field	Value
Publication number	US-11937541-B2
Application number	US-202117470026-A
Country	US
Kind code	B2
Filing date	Sep 9, 2021
Priority date	Aug 7, 2018
Publication date	Mar 26, 2024
Grant date	Mar 26, 2024

Abstract

A grass cutting head includes a spool for winding a grass cutting line, a head housing for accommodating the spool, a first guiding structure disposed at least partially in the head housing, and a second guiding structure formed on the spool. The first guiding structure guides the grass cutting line through the head housing when threading the grass cutting line. The second guiding structure guides the grass cutting line to move and be wound around the spool by relative motion created between the spool and the head housing. The head housing includes a first housing and a second housing. The first guiding structure is disposed at least partially in the first housing. The spool is disposed between the first housing and the second housing. The first housing or the second housing is provided with an outer threading hole for allowing the grass cutting line to pass in or out.

First claim

What is claimed is:

1. A grass cutting head, comprising:
a spool comprising a winding groove formed between an upper side and a lower side of the spool and configured for winding a grass cutting line;
a head housing to accommodate at least part of the spool;
a first guiding structure facing the upper side or the lower side of the spool and comprising a first guiding portion integrally formed with the head housing or fixedly connected to the head housing, the first guiding structure guides the grass cutting line through the head housing when threading the grass cutting line and the grass cutting line does not enter the winding groove; and
a second guiding structure separate from the first guiding structure and comprising a second guiding portion formed on the spool or connected to the spool, the second guiding structure to guide a portion of the grass cutting line to move to the winding groove when a relative rotation occurs between the spool and the head housing,
wherein the head housing comprises a first housing and a second housing, the spool is disposed between the first housing and the second housing, and the first housing or the second housing is provided with an outer threading hole to allow the grass cutting line to pass therethrough.

2. The grass cutting head of claim 1 , further comprising an eyelet member detachably connected to the outer threading hole, and wherein the eyelet member is provided with a threading hole.

3. The grass cutting head of claim 2 , wherein a length of the threading hole in a direction parallel to an axis of the head housing is less than a length of the threading hole in a circumference of the head housing.

4. The grass cutting head of claim 1 , wherein the first guiding portion comprises a channel to guide the grass cutting line, and that is symmetrically disposed about a straight line passing through the outer threading hole and an axis of the head housing.

5. The grass cutting head of claim 1 , wherein the first guiding portion comprises a threading channel to guide the grass cutting line through the head housing and a notch communicated with the threading channel to allow the grass cutting line to pass in or out, and the threading channel is disposed outside of the spool.

6. The grass cutting head of claim 5 , wherein the threading channel comprises a threading guiding area configured to allow the grass cutting line to pass through, a temporary storage area configured to temporarily store a part of the grass cutting line passing through the threading guiding area, and a rotation area configured to allow the second guiding structure to rotate therein, and the first guiding portion is configured to divide the threading channel into a left threading channel and a right threading channel.

7. The grass cutting head of claim 1 , wherein the spool comprises a stopper configured to prevent the grass cutting line from detaching from the winding groove in a first axis, and an accommodation groove configured to accommodate part of the grass cutting line, and the stopper is further configured to form the second guiding structure or be connected to the second guiding structure.

8. The grass cutting head of claim 7 , wherein the stopper is provided with an opening, the second guiding structure is disposed at the opening, and the second guiding structure is configured to guide the grass cutting line into the winding groove when the grass cutting head enters a winding mode.

9. The grass cutting head of claim 8 , wherein the second guiding structure is tilted upward from the stopper.

10. The grass cutting head of claim 8 , wherein a distance between the second guiding structure and the head housing is less than a diameter of the grass cutting line.

11. The grass cutting head of claim 7 , wherein the stopper comprises a first stopping portion and a second stopping portion, and the winding groove is located between the first stopping portion and the second stopping portion.

12. The grass cutting head of claim 1 , wherein the second housing is disposed on a lower side of the first housing.

13. The grass cutting head of claim 1 , wherein the grass cutting head further comprises a plate provided with the first guiding structure, and the plate is fixedly connected to the first housing or the second housing.

14. A grass cutting head, comprising:
a spool provided with a winding groove formed between an upper side and a lower side of the spool and configured to wind a grass cutting line;
a head housing configured to accommodate at least part of the spool;
a first guiding structure facing the upper side of the spool, the first guiding structure comprising a first guiding portion fixedly connected to the head housing or integrally formed with the head housing to guide the grass cutting line through the head housing without entering the winding groove when threading the grass cutting line; and
a second guiding structure comprising a second guiding portion formed on or connected to the spool to guide a portion of the grass cutting line to move to the winding groove when a relative rotation occurs between the spool and the head housing.

15. The grass cutting head of claim 14 , wherein the first guiding portion comprises a threading channel configured to guide the grass cutting line through the head housing and a notch communicated with the threading channel and configured to allow the grass cutting line to pass in or out.

16. The grass cutting head of claim 15 , wherein the threading channel comprises a threading guiding area configured to allow the grass cutting line to pass through, a temporary storage area configured to temporarily store a portion of the grass cutting line passing through the threading guiding area, and a rotation area configured to allow the second guiding structure to rotate therein.

17. The grass cutting head of claim 14 , wherein the head housing comprising a first housing and a second housing, the spool is disposed between the first housing and the second housing, the grass cutting head further comprises a plate provided with the first guiding structure, and the plate is fixedly connected to the first housing or the second housing.

18. A grass trimmer, comprising:
a grass cutting head;
a motor configured to drive the grass cutting head to rotate around a first axis;
a spool comprising a winding groove formed between an upper side and a lower side of the spool and configured for winding a grass cutting line;
a head housing configured to accommodate at least part of the spool;
a first guiding structure facing the lower side of the spool, the first guiding structure comprising a first guide integrally formed with the head housing or fixedly connected to the head housing, the first guiding structure guides the grass cutting line through the head housing when threading the grass cutting line such that the grass cutting line does not enter the winding groove; and
a second guiding structure comprising a second guide formed on the spool or connected to the spool,
wherein the grass trimmer further has a winding mode, and the second guiding structure is configured to guide a portion of the grass cutting line to move to the winding groove when a relative rotation occurs between the spool and the head housing.

19. The grass trimmer of claim 18 , wherein the head housing comprises a first housing and a second housing, the spool is disposed between the first housing and the second housing, and the first housing or the second housing is provided with an outer threading hole configured for allowing the grass cutting

Assignees

• Nanjing Chervon Ind Co Ltd

Inventors

• Peng Ming
• Guo Jianpeng
• Ren Dehong

Classifications

• A01D34/4166 Primary

  Mounting or replacement of the lines · CPC title

• A01D34/90

  for carrying by the operator · CPC title

• A01D34/4161 Primary

  Means for feeding cutter line · CPC title

• A01D34/416

  Flexible line cutters · CPC title