Patents by Inventor Sona R. MATHEW

Sona R. MATHEW has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Under-speed and closed-loop speed control in a variable-speed power tool
    Patent number: 11973451
    Abstract: A method of operating a power tool having a motor and a controller is provided. The method includes: receiving a position of a variable-speed input mechanism mounted on the power tool; determining a target speed of the motor corresponding to the position of the variable-speed input mechanism; determining an underspeed threshold corresponding to the target speed; determining a rotational speed of the motor; and interrupting a supply of power to the motor if the rotational speed of the motor is less than the underspeed threshold.
    Type: Grant
    Filed: May 9, 2022
    Date of Patent: April 30, 2024
    Assignee: Black & Decker Inc.
    Inventors: Jason D. McKillican, Sona R. Mathew, Jason Thrush, Alexander P. Davidson
  • CONSTANT-CLUTCH OPERATION AT POWER TOOL START-UP
    Publication number: 20240097431
    Abstract: A method of operating a power tool having a motor and a controller is provided. The method includes: setting a protection time limit associated with a condition of the motor; taking protective action to shut down the motor if the condition of the motor persists for a duration of the protection time limit; and in response to occurrence of the condition during a start-up period of operation of the motor, extending the protection time limit for a duration of a constant-clutch time period to allow an output speed of the motor to reach or exceed a speed threshold, and taking protective action to shut down the motor if the output speed of the motor remains below the speed threshold for the duration of the constant-clutch time period.
    Type: Application
    Filed: September 20, 2022
    Publication date: March 21, 2024
    Inventors: Sona R. MATHEW, Daniel F. NACE, Jason D. McKILLICAN, Christopher T. KING
  • UNDER-SPEED AND CLOSED-LOOP SPEED CONTROL IN A VARIABLE-SPEED POWER TOOL
    Publication number: 20220368250
    Abstract: A method of operating a power tool having a motor and a controller is provided. The method includes: receiving a position of a variable-speed input mechanism mounted on the power tool; determining a target speed of the motor corresponding to the position of the variable-speed input mechanism; determining an underspeed threshold corresponding to the target speed; determining a rotational speed of the motor; and interrupting a supply of power to the motor if the rotational speed of the motor is less than the underspeed threshold.
    Type: Application
    Filed: May 9, 2022
    Publication date: November 17, 2022
    Inventors: Jason D. MCKILLICAN, Sona R. MATHEW, Jason THRUSH, Alexander P. DAVIDSON