Trimmer head assembly for a trimmer

Patent metadata

Field	Value
Publication number	US-11503763-B2
Application number	US-202016732895-A
Country	US
Kind code	B2
Filing date	Jan 2, 2020
Priority date	Jan 3, 2019
Publication date	Nov 22, 2022
Grant date	Nov 22, 2022

Abstract

Trimmer heads for trimmers are provided. A trimmer head includes a drive plate defining a lug slot, and a locking lug, the locking lug movably positioned in the lug slot and movable between an unlocked position and a locked position. A trimmer head further includes a drive plate cover connectable to the drive plate such that the locking lug is disposed between the drive plate and the drive plate cover. A trimmer head farther includes at least one operational head, the at least one operational head connectable to the drive plate. The connected operational head is locked to the drive plate when the locking lug is in the locked position and the connected operational head is unlocked from the drive plate when the locking lug is in the unlocked position.

First claim

What is claimed is:

1. A trimmer head for a trimmer, the trimmer head comprising:
a drive plate defining a lug slot;
a locking lug, the locking lug movably positioned in the lug slot and movable along a radial direction between an unlocked position and a locked position;
a drive plate cover connectable to the drive plate such that the locking lug is disposed between the drive plate and the drive plate cover; and
at least one operational head, the at least one operational head connectable to the drive plate,
wherein the connected operational head is locked to the drive plate when the locking lug is in the locked position and the connected operational head is unlocked from the drive plate when the locking lug is in the unlocked position.

2. The trimmer head of claim 1 , wherein the operational head comprises a connection tab which defines a connection passage extending therethrough, wherein the locking lug extends through the connection passage when the operational head is connected and the locking lug is in the locked position, and wherein the locking lug is free from the connection passage when the operational head is connected and the locking lug is in the unlocked position.

3. The trimmer head of claim 1 , wherein the drive plate cover defines a cam slot, and wherein movement of the locking lug relative to the cam slot causes movement of the locking lug between the unlocked position and the locked position.

4. The trimmer head of claim 3 , wherein a post extends from the locking lug, the post positioned in the cam slot when the drive plate cover is connected to the drive plate.

5. The trimmer head of claim 3 , wherein the movement of the locking lug relative to the cam slot is caused by movement of the connected operational head relative to the drive plate cover.

6. The trimmer head of claim 5 , wherein the movement of the connected operational head relative to the drive plate cover is rotational movement.

7. The trimmer head of claim 1 , wherein the drive plate cover further defines a lock notch, and further comprising a centrifugal lock movable between an unlocked position and a locked position, wherein the centrifugal lock is disposed in the lock notch when in the locked position and is outside of the lock notch when in the unlocked position.

8. The trimmer head of claim 7 , wherein the centrifugal lock is pivotable between the unlocked position and the locked position.

9. The trimmer head of claim 7 , wherein the centrifugal lock is biased towards the unlocked position.

10. The trimmer head of claim 1 , wherein the drive plate cover further comprises a detent and the drive plate defines a first detent notch and a second detent notch, wherein the detent is selectively seated in the first detent notch or the second detent notch when the drive plate cover is connected to the drive plate.

11. The trimmer head of claim 1 , wherein the trimmer head is a trimmer head kit and the at least one operational head is a plurality of interchangeable operational heads.

12. A trimmer head for a trimmer, the trimmer head comprising:
a drive plate defining a lug slot;
a locking lug, the locking lug movably positioned in the lug slot and movable between an unlocked position and a locked position;
a drive plate cover connectable to the drive plate such that the locking lug is disposed between the drive plate and the drive plate cover, the drive plate cover defining a cam slot; and
at least one operational head, the at least one operational head connectable to the drive plate, the operational head comprising a connection tab which defines a connection passage extending therethrough,
wherein movement of the locking lug relative to the cam slot causes movement of the locking lug between the unlocked position and the locked position, and
wherein the locking lug extends through the connection passage when the operational head is connected and the locking lug is in the locked position, and the locking lug is free from the connection passage when the operational head is connected and the locking lug is in the unlocked position.

13. The trimmer head of claim 12 , wherein a post extends from the locking lug, the post positioned in the cam slot when the drive plate cover is connected to the drive plate.

14. The trimmer head of claim 12 , wherein the movement of the locking lug relative to the cam slot is caused by movement of the connected operational head relative to the drive plate cover.

15. The trimmer head of claim 12 , wherein the drive plate cover further defines a lock notch, and further comprising a centrifugal lock movable between an unlocked position and a locked position, wherein the centrifugal lock is disposed in the lock notch when in the locked position and is outside of the lock notch when in the unlocked position.

16. The trimmer head of claim 15 , wherein the centrifugal lock is pivotable between the unlocked position and the locked position.

17. The trimmer head of claim 15 , wherein the centrifugal lock is biased towards the unlocked position.

18. The trimmer head of claim 12 , wherein the drive plate cover further comprises a detent and the drive plate defines a first detent notch and a second detent notch, wherein the detent is selectively seated in the first detent notch or the second detent notch when the drive plate cover is connected to the drive plate.

19. The trimmer head of claim 12 , wherein the trimmer head is a trimmer head kit and the at least one operational head is a plurality of interchangeable operational heads.

20. A trimmer head for a trimmer, the trimmer head comprising:
a drive plate defining a lug slot;
a locking lug, the locking lug movably positioned in the lug slot and movable between an unlocked position and a locked position;
a drive plate cover connectable to the drive plate such that the locking lug is disposed between the drive plate and the drive plate cover; and
at least one operational head, the at least one operational head connectable to the drive plate,
wherein the connected operational head is locked to the drive plate when the locking lug is in the locked position and the connected operational head is unlocked from the drive plate when the locking lug is in the unlocked position, and
wherein the drive plate cover further defines a lock notch, and further comprising a centrifugal lock movable between an unlocked position and a locked position, wherein the centrifugal lock is disposed in the lock notch when in the locked position and is outside of the lock notch when in the unlocked position.

Assignees

• Techtronic Cordless Gp

Inventors

• Holman Christopher A
• Hoffman Ronald J
• Nolin J Eric

Classifications

• A01D34/4165 Primary

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• A01G3/062

  Motor-driven edge trimmers · CPC title

• A01D34/736

  Flail type · CPC title

• A01D34/733 Primary

  Cutting-blade mounting means · CPC title

• B25F3/00 Primary

  Associations of tools for different working operations with one portable power-drive means; Adapters therefor · CPC title