Easy hole start operation for drilling power tools

Patent metadata

Field	Value
Publication number	US-11942880-B2
Application number	US-202217696320-A
Country	US
Kind code	B2
Filing date	Mar 16, 2022
Priority date	Mar 16, 2021
Publication date	Mar 26, 2024
Grant date	Mar 26, 2024

Abstract

A power tool, such as a drilling power tool, configured to perform an easy hole start operation upon actuation of a trigger. When the trigger is actuated, the motor is driven at a low speed value. The motor speed is increased to a second speed value during a predetermined time threshold and then driven at the second speed value until the trigger is no longer actuated. In some embodiments, the easy hole start operation may be implemented by an easy hole start switch. In some embodiments, if the easy hole start operation persists for a time greater than a predetermined time threshold, then the motor will shut off.

First claim

What is claimed is:

1. A power tool comprising:
a housing;
a motor within the housing;
a battery pack interface configured to receive a battery pack and provide power to the motor;
an actuator movably coupled to the housing; and
an electronic controller connected to the motor, the battery pack, and the actuator, the electronic controller configured to:
detect that the actuator has been actuated,
drive the motor at a first speed,
increase a speed of the motor from the first speed to a target second speed until a predetermined time threshold is reached, wherein the predetermined time threshold is in a range of 10-150 seconds,
compare the speed of the motor to the target second speed of the motor, and
turn off the power tool when the predetermined time threshold is reached and if the speed of the motor has not reached the target second speed of the motor.

2. The power tool of claim 1 , wherein the electronic controller is further configured to:
determine, prior to detecting that the actuator has been actuated, that a second actuator has been actuated.

3. The power tool of claim 1 , wherein the first speed is in a range of 0%-15% of a full speed of the motor.

4. The power tool of claim 1 , wherein the motor is driven using pulse width modulation (PWM) signals.

5. The power tool of claim 1 , wherein the actuator is a trigger.

6. The power tool of claim 1 , wherein the speed of the motor is increased in a linear manner.

7. The power tool of claim 1 , wherein the power tool is a drill.

8. A method for controlling operation of a power tool, the method comprising:
detecting, by a motor controller of the power tool, that an actuator of the power tool has been actuated;
driving, by the motor controller, a motor of the power tool at a first speed;
increasing, by the motor controller, a speed of the motor from the first speed to a target second speed until a predetermined time threshold is reached, wherein the predetermined time threshold is in a range of 10-150 seconds;
comparing, by the motor controller, the speed of the motor to the target second speed of the motor; and
turning off, by the motor controller, the power tool when the predetermined time threshold is reached and if the speed of the motor has not reached the target second speed of the motor.

9. The method of claim 8 further comprising:
determining, by the motor controller, prior to detecting that the actuator has been actuated, that a second actuator has been actuated.

10. The method of claim 8 , wherein the first speed is in a range of 0%45% of a full speed of the motor.

11. The method of claim 8 , wherein the motor is driven using pulse width modulation (PWM) signals.

12. The method of claim 8 , wherein the speed of the motor is increased in a linear manner.

13. A power tool comprising:
a housing;
a motor within the housing;
a battery pack interface configured to receive a battery pack and provide power to the motor;
an actuator movably coupled to the housing;
a switch coupled to the housing, the switch being movable between a first position and a second position; and
an electronic controller connected to the motor, the battery pack, and the actuator, the electronic controller configured to:
detect that the switch is in the first position,
detect that the actuator has been actuated,
drive the motor at a first speed,
increase a speed of the motor to a target second speed during a predetermined time threshold, wherein the predetermined time threshold is in a range of 10 seconds to 150 seconds,
compare the speed of the motor to the target second speed of the motor, and
turn off the power tool when the predetermined time threshold is reached and if the speed of the motor has not reached the target second speed of the motor.

14. The power tool of claim 13 , further comprising a user interface.

15. The power tool of claim 13 , wherein the first speed is in a range of 0%-15% of a full speed of the motor.

16. The power tool of claim 13 , wherein the speed of the motor is increased in a linear manner.

17. The power tool of claim 14 , wherein the user interface is configured to set the first speed, the target second speed, and the predetermined time threshold.

Assignees

• Milwaukee Electric Tool Corp

Inventors

• Walker Woodrow W
• Schmitz Jonathan E
• Medeiros-Nicholson Andrew T
• Nakum Bharat C
• Sellnow Brittany Ann

Classifications

• B25F5/00

  Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for · CPC title

• H02P1/18 Primary

  for starting an individual DC motor · CPC title

• B23B45/02 Primary

  driven by electric power · CPC title

• H02P1/04

  Means for controlling progress of starting sequence in dependence upon time or upon current, speed, or other motor parameter · CPC title

• B23B2260/062

  Electric motors · CPC title