Chainsaw

Patent metadata

Field	Value
Publication number	US-12064894-B2
Application number	US-202117465095-A
Country	US
Kind code	B2
Filing date	Sep 2, 2021
Priority date	Sep 4, 2020
Publication date	Aug 20, 2024
Grant date	Aug 20, 2024

Abstract

A power tool includes a switch moveable between a first position enabling activation of a motor and a second position disabling the motor. The power tool includes a trigger movably coupled to a housing of the power tool between an OFF position and an ON position. The switch moves from the second position to the first position in response to the trigger moving from the OFF position to the ON position. The power tool includes a trigger lock-off pivotably coupled to the housing between a lock position and an unlock position. The trigger lock-off is engageable with the trigger to inhibit movement of the trigger from the OFF position to the ON position when the trigger lock-off is in the lock position. The trigger lock-off allows movement of the trigger from the OFF position to the ON position when the trigger lock-off is in the unlock position.

First claim

The invention claimed is:

1. A power tool comprising:
a housing;
a battery pack selectively coupled to the housing;
a motor supported within the housing, the motor electrically coupled to the battery pack when the battery pack is coupled to the housing;
a switch supported within the housing, the switch moveable between a first position enabling activation of the motor by the battery pack and a second position disabling the motor;
a trigger movably coupled to the housing between an OFF position and an ON position, the switch moves from the second position to the first position in response to the trigger moving from the OFF position to the ON position; and
a trigger lock-off pivotably coupled to the housing between a lock position and an unlock position, the trigger lock-off engageable with the trigger to inhibit movement of the trigger from the OFF position to the ON position when the trigger lock-off is in the lock position, the trigger lock-off allowing movement of the trigger from the OFF position to the ON position when the trigger lock-off is in the unlock position;
wherein the trigger includes a protrusion pivotably coupled to the trigger for movement with the trigger between the OFF position and the ON position, and
wherein the protrusion engages the trigger lock-off to inhibit movement of the trigger from the OFF position to the ON position.

2. The power tool of claim 1 , wherein the protrusion includes a resilient arm positioned within the trigger to engage an inner surface of the trigger and a stop extending from the trigger, and wherein the resilient arm biases the stop into engagement with an upper surface of the trigger.

3. The power tool of claim 2 , wherein the stop includes a flat surface engageable with an arcuate surface of the trigger lock-off to inhibit movement of the trigger from the OFF position to the ON position.

4. The power tool of claim 3 , wherein the stop includes a curved surface adjacent the flat surface, and wherein the resilient arm biases the curved surface in engagement with the arcuate surface of the trigger lock-off when the trigger lock-off is in the locked position and the trigger is moving from the ON position toward the OFF position.

5. The power tool of claim 4 , wherein the switch includes a plunger engageable with a portion of the trigger, wherein the plunger biases the trigger from the ON position toward the OFF position, and wherein the engagement between the curved surface of the stop and the arcuate surface of the trigger lock-off assists the plunger in biasing the trigger from the ON position toward the OFF position.

6. The power tool of claim 1 , wherein the trigger includes a protrusion formed integral with the trigger, and wherein the protrusion engages the trigger lock-off when in the locked position for the trigger lock-off to hold the trigger in the ON position.

7. The power tool of claim 1 , further comprising a guide bar coupled to the housing and a cutting chain coupled to the guide bar, wherein the cutting chain is driven around the guide bar by the motor when the trigger is in the ON position.

8. A power tool comprising:
a housing having a handle;
a motor supported within a portion of the housing;
a switch supported within the handle, the switch moveable between a first position enabling activation of the motor and a second position disabling the motor;
a trigger movably coupled to the handle between an OFF position and an ON position, the switch moves from the second position to the first position in response to the trigger moving from the OFF position to the ON position, the trigger including a resilient protrusion that moves with the trigger between the OFF position and the ON position; and
a trigger lock-off pivotably coupled to the handle between a lock position and an unlock position, the trigger lock-off engageable with the resilient protrusion to inhibit movement of the trigger from the OFF position to the ON position when the trigger lock-off is in the lock position, the trigger lock-off allowing movement of the trigger from the OFF position to the ON position when the trigger lock-off is in the unlock position;
wherein the resilient protrusion is pivotably coupled to the trigger.

9. The power tool of claim 8 , wherein the resilient protrusion includes an arm positioned within the trigger to engage an inner surface of the trigger and a stop extending from the trigger, and wherein the arm biases the stop into engagement with an upper surface of the trigger.

10. The power tool of claim 9 , wherein the stop includes a flat surface engageable with an arcuate surface of the trigger lock-off to inhibit movement of the trigger from the OFF position to the ON position.

11. The power tool of claim 10 , wherein the stop includes a curved surface adjacent the flat surface, and wherein the arm biases the curved surface in engagement with the arcuate surface of the trigger lock-off when the trigger lock-off is in the locked position and the trigger is moving from the ON position toward the OFF position.

12. The power tool of claim 11 , wherein the switch includes a plunger engageable with a portion of the trigger, wherein the plunger biases the trigger from the ON position toward the OFF position, and wherein the engagement between the curved surface of the stop and the arcuate surface of the trigger lock-off assists the plunger in biasing the trigger from the ON position toward the OFF position.

13. The power tool of claim 8 , further comprising a guide bar coupled to the housing and a cutting chain coupled to the guide bar, wherein the cutting chain is driven around the guide bar by the motor when the trigger is in the ON position.

14. A power tool comprising:
a housing having a handle;
a motor supported within a portion of the housing;
a switch supported within the handle, the switch including a plunger moveable between a first position enabling activation of the motor and a second position disabling the motor;
a trigger pivotably coupled to the handle about a pivot axis between an OFF position and an ON position, the trigger including an arm and an engagement surface, the pivot axis positioned between the arm and the engagement surface, the arm engageable with the plunger, the engagement surface configured to be engaged by an operator to move the trigger from the OFF position toward the ON position, the trigger including a resilient protrusion that moves with the trigger between the OFF position and the ON position; and
a trigger lock-off pivotably coupled to the handle between a lock position and an unlock position, the trigger lock-off engageable with the resilient protrusion to inhibit movement of the trigger from the OFF position to the ON position when the trigger lock-off is in the lock position, the trigger lock-off allowing movement of the trigger from the OFF position to the ON position when the trigger lock-off is in the unlock position,
wherein the plunger biases the trigger from the ON position toward the OFF position, and wherein a biasing force of the resilient protrusion against the trigger lock-off assists the plunger in biasing the trigger from the ON position toward the OFF position when the trigger lock-off is in the locked position.

15. The power tool of claim 14 , wherein the resilient protrusion includes an arm positioned within the trigger to engage an inner surface of the trigger and a stop extending from the trigger, and wherein the arm biases the stop into engagement with an upper surface of the trigger.

16. The power tool of claim 15 , wherein the stop includes a flat surface engageable with an arcua

Assignees

• Milwaukee Electric Tool Corp

Inventors

• Schlosser Drake J
• Gordon Benjamin
• Patterson John P
• Banholzer Hans T

Classifications

• B27B17/02 Primary

  Chain saws equipped with guide bar (B27B17/06 takes precedence) · CPC title

• B25F5/02

  Construction of casings, bodies or handles {(B25F5/006, B25F5/008 take precedence)} · CPC title

• B23D57/023

  hand-held or hand-operated · CPC title

• B27B17/08

  Drives or gearings; Devices for swivelling or tilting the chain saw · CPC title

• B27G19/003

  for chain saws (braking devices B27B17/08) · CPC title