Trimmer head

Patent metadata

Field	Value
Publication number	US-10939614-B2
Application number	US-201816174447-A
Country	US
Kind code	B2
Filing date	Oct 30, 2018
Priority date	Nov 3, 2017
Publication date	Mar 9, 2021
Grant date	Mar 9, 2021

Abstract

A trimmer head for use with a handheld lawn maintenance tool is shaped in a hub-and-spoke manner, wherein the trimmer head includes a housing formed of a hub, a circular rim, and a plurality of spokes extending therebetween. A spool is positioned within the hub, and a pair of pieces of trimmer line are inserted into opposing sides of the circular rim through the spokes for winding onto the spool. The trimmer line extends outwardly from the housing at a location spaced away from the hub.

First claim

What is claimed is:

1. A trimmer head comprising:
a housing having a core, a circular rim, and at least two arms that extend radially between said core and said circular rim, said circular rim being spaced apart and oriented concentrically about said core;
at least two openings formed through an outer circumferential edge of said housing, wherein each of said at least two openings are aligned with one of said at least two arms for allowing a piece of a trimmer line to extend radially outward from said housing through said opening; and
a spool and a spring, wherein said spool is positioned within said housing and said spring is located between said spool and said housing for biasing said spool into selective engagement with said housing.

2. The trimmer head of claim 1 further comprising a bump knob extending downwardly from said housing, said bump knob being releasably attached to said spool, wherein contact of said bump knob with a solid surface causes said spool to disengage from said housing.

3. The trimmer head of claim 1 , wherein each of the at least two arms of said housing comprises a pair of elongate channels extending radially outward to said circular rim.

4. The trimmer head of claim 3 , wherein said housing includes an upper disk body and a lower disk body, and each of said pair of elongate channels is formed by the mating of one half of said channel formed in the upper disk body and a second half of said channel located in the lower disk body.

5. The trimmer head of claim 4 , wherein a trimmer line tube is positioned within each of said elongate channels for receiving a portion of the trimmer line.

6. The trimmer head of claim 5 , wherein said spool receives the trimmer line, wherein said trimmer line tube extends radially outward from a location adjacent to said spool toward said outer circumferential edge of said housing.

7. A trimmer head comprising:
a housing having an upper disk body and a lower disk body, wherein each of said upper disk body and said lower disk body includes a core, a rim, and a plurality of arms extending between said core and said rim;
a plurality of elongate channels formed by said upper and lower disk bodies, wherein each of said elongated channels extends through each of said arms to an outer circumferential edge of said housing; and
a first portion of a trimmer line is positioned within each of said channels, and a second portion of said trimmer line extends outwardly from said outer circumferential edge of said housing.

8. The trimmer head of claim 7 , wherein the second portion of each of said trimmer lines extending outwardly from said outer circumferential edge of said housing is less than the first portion of said trimmer line positioned within said channel.

9. The trimmer head of claim 7 further comprising an opening for each of said elongate channels being formed through said outer circumferential edge of said housing, wherein a portion of one of said trimmer lines extends through each of said openings.

10. The trimmer head of claim 7 , wherein each of said trimmer lines is formed as a monofilament trimmer line or a shaped trimmer line.

11. The trimmer head of claim 7 further comprising a trimmer line tube positioned within each of said channels formed by said upper and lower disk bodies, wherein each of said trimmer line tubes receives one of said portions of the trimmer line.

12. The trimmer head of claim 7 , wherein said arms of said lower disk body and said rim of said lower disk body are integrally formed together, and said core of said lower disk body is attached to said arms of said lower disk body.

13. The trimmer head of claim 7 , wherein each of said elongate channels receives a trimmer line tube therein, said trimmer line tube configured to receive one of said portions of the trimmer line.

14. The trimmer head of claim 13 , further comprising a spool, wherein said second portion of the trimmer line extending from each side of the outer circumferential edge of said housing is shorter than the length of said trimmer line extending between the spool and the outer circumferential edge of said housing.

15. A trimmer head comprising a central hub, a circular rim spaced apart from said central hub, and a plurality of spokes extending between said central hub and said rim, wherein at least one cutting member extends radially outward from said rim, wherein the at least one cutting member is configured as trimmer line, the trimmer head further comprising a spool for receiving at least one piece of the trimmer line, wherein the spool is positioned within said central hub.

16. The trimmer head of claim 15 further comprising a spring positioned between the spool and an upper portion of said hub or a lower portion of said hub, said spring biasing said spool into selective engagement with said lower of said hub or the upper portion of said hub.

17. The trimmer head of claim 15 , wherein said trimmer line is a shaped trimmer line.

Assignees

• Mtd Products Inc

Inventors

• Bringhurst Cory
• Kucera Jeffrey

Classifications

• A01D34/4163 Primary

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

• A01D2101/00

  Lawn-mowers · CPC title

• A01D34/4166

  Mounting or replacement of the lines · CPC title