Trimmer head assembly for a trimmer

Patent metadata

Field	Value
Publication number	US-11528843-B2
Application number	US-202016745941-A
Country	US
Kind code	B2
Filing date	Jan 17, 2020
Priority date	Jan 25, 2019
Publication date	Dec 20, 2022
Grant date	Dec 20, 2022

Abstract

A trimmer head or trimmer head assembly for a trimmer is provided herein. The trimmer head may include a base plate defining an axial direction, a pivot head, and a blade retainer. The pivot head may be attached to the base plate. The blade retainer may include a radial arm rotatably mounted to the base plate to rotate relative to the base plate between a first position at which the radial arm is circumferentially aligned with the pivot head and a second position at which the radial arm is circumferentially spaced apart from the pivot head.

First claim

What is claimed is:

1. A trimmer head for a trimmer, the trimmer head comprising:
a base plate defining an axial direction;
a pivot head attached to the base plate, the pivot head comprising
an extended post having a blade support surface to selectively receive a flail blade, and
a main body positioned between the extended post and the base plate relative to the axial direction, the main body defining a string slot to receive a trimmer string line therethrough; and

a blade retainer comprising a radial arm rotatably mounted to the base plate to rotate relative to the base plate between a first position at which the radial arm is circumferentially aligned with the pivot head and a second position at which the radial arm is circumferentially spaced apart from the pivot head,
wherein, when in the first position, the blade support surface is positioned between the base plate and the radial arm relative to the axial direction.

2. The trimmer head of claim 1 , wherein the blade retainer further comprises
a mounting arm rotatably mounted to the base plate below the blade support surface relative to the axial direction, and
an axial arm extending axially from a proximal end at the mounting arm to a distal end at the radial arm.

3. The trimmer head of claim 1 , further comprising:
a first snap surface extending from the base plate; and
a second snap surface extending from the base plate and circumferentially spaced apart from the first snap surface,
wherein the blade retainer further comprises a resilient detent held in a frictional-fit lock against the first snap surface in the first position and against the second snap surface in the second position.

4. The trimmer head of claim 1 , wherein the pivot head is a first pivot head, wherein the radial arm is a first radial arm, wherein the flail blade is a first flail blade, wherein the trimmer head further comprises a second pivot head attached to the base plate, the second pivot head comprising an extended post having a blade support surface to selectively receive a second flail blade, and
wherein the blade retainer further comprises a second radial arm rotatably mounted to the base plate to rotate relative to the base plate between the first position and the second position, the second radial arm being circumferentially aligned with the second pivot head in the first position and circumferentially spaced apart from the second pivot head in the second position.

5. The trimmer head of claim 4 , wherein the first pivot head and the second pivot head are circumferentially spaced apart more than 90° about the axial direction.

6. The trimmer head of claim 1 , wherein the pivot head further comprises a head support pivotally received within a complementary support void defined within the base plate, the head support being positioned opposite from the extended post relative to the axial direction.

7. The trimmer head of claim 1 , further comprising an assembly cap holding the blade retainer to the base plate along the axial direction.

8. The trimmer head of claim 1 , wherein the radial arm defines a circumferential channel to receive the extended post in the first position.

9. A trimmer head for a trimmer, the trimmer head comprising:
a base plate defining an axial direction;
a pivot head attached to the base plate, the pivot head comprising an extended post having a blade support surface to selectively receive a flail blade; and
a blade retainer comprising
a mounting arm rotatably mounted to the base plate below the blade support surface relative to the axial direction,
an axial arm extending axially from a proximal end at the mounting arm to a distal end above the blade support surface, and
a radial arm extending radially from the distal end to rotate relative to the base plate between a first position at which the radial arm is circumferentially aligned with the pivot head and a second position at which the radial arm is circumferentially spaced apart from the pivot head,
wherein, when in the first position, the blade support surface is positioned between the radial arm and the base plate relative to the axial direction.

10. The trimmer head of claim 9 , further comprising:
a first snap surface extending from the base plate; and
a second snap surface extending from the base plate and circumferentially spaced apart from the first snap surface,
wherein the blade retainer further comprises a resilient detent held in a frictional-fit lock against the first snap surface in the first position and against the second snap surface in the second position.

11. The trimmer head of claim 9 , wherein the pivot head is a first pivot head, wherein the radial arm is a first radial arm, wherein the flail blade is a first flail blade, wherein the trimmer head further comprises a second pivot head attached to the base plate, the second pivot head comprising an extended post having a blade support surface to selectively receive a second flail blade, and
wherein the blade retainer further comprises a second radial arm rotatably mounted to the base plate to rotate relative to the base plate between the first position and the second position, the second radial arm being circumferentially aligned with the second pivot head in the first position and circumferentially spaced apart from the second pivot head in the second position.

12. The trimmer head of claim 11 , wherein the first pivot head and the second pivot head are circumferentially spaced apart more than 90° about the axial direction.

13. The trimmer head of claim 9 , wherein the pivot head further comprises a head support pivotally received within a complementary support void defined within the base plate, the head support being positioned opposite from the extended post relative to the axial direction.

14. The trimmer head of claim 9 , an assembly cap holding the blade retainer to the base plate along the axial direction.

15. The trimmer head of claim 9 , wherein the radial arm defines a circumferential channel to receive the extended post in the first position.

16. A trimmer head for use with a trimmer, the trimmer head comprising:
a base plate defining an axial direction;
a first snap surface extending from the base plate;
a second snap surface extending from the base plate and circumferentially spaced apart from the first snap surface;
a pivot head attached to the base plate, the pivot head comprising an extended post having a blade support surface to selectively receive a flail blade; and
a blade retainer comprising
a radial arm rotatably mounted to the base plate to rotate relative to the base plate between a first position at which the radial arm is circumferentially aligned with the pivot head and a second position at which the radial arm is circumferentially spaced apart from the pivot head, and
a resilient detent held in a frictional-fit lock against the first snap surface in the first position and against the second snap surface in the second position.

17. The trimmer head of claim 16 , wherein the pivot head is a first pivot head, wherein the radial arm is a first radial arm, wherein the flail blade is a first flail blade, wherein the trimmer head further comprises a second pivot head attached to the base plate, the second pivot head comprising an extended post having a blade support surface to selectively receive a second flail blade
wherein the blade retainer further comprises a second radial arm rotatably mounted to the base plate to rotate relative to the base plate between the first position and the second position, the second radial arm being circumf

Assignees

• Techtronic Cordless Gp

Inventors

• Nolin J Eric
• Hoffman Ron
• Schmidt Andrew M
• Vora Fahad T

Classifications

• A01D34/4166

  Mounting or replacement of the lines · CPC title

• A01D34/416 Primary

  Flexible line cutters · CPC title

• A01D34/84

  for edges of lawns or fields, e.g. for mowing close to trees or walls ({for embankments A01D34/86 takes precedence;} edge trimmers A01G3/00) · CPC title

• A01G3/0535

  with rotatable knives · CPC title

• A01D34/73

  Cutting apparatus · CPC title