Patents by Inventor R. Gregory Pence

R. Gregory Pence 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).

  • Valve actuator differential worm planetary gear drive
    Patent number: 4994001
    Abstract: A valve actuator differential worm planetary gear drive provides forward or reverse motion to a valve stem, from an input from either a motor-driven worm or a handwheel drive worm, by using a plurality of planet gears to send motion to the sun gear. If the preference is to have the motor drive the valve primarily, the manual worm stays locked and the motor worm acts as a planetary arm. When it is desired to move the valve by hand, the motor gear is fixed and rotation of the handwheel worm gear transmits the power through the ring gear and the planet gears to the drive sleeve.
    Type: Grant
    Filed: August 7, 1989
    Date of Patent: February 19, 1991
    Assignee: Limitorque Corporation
    Inventors: Ivan E. Wilkinson, Charles L. Hylton, R. Gregory Pence
  • Valve actuator differential worm planetary gear drive
    Patent number: 4896562
    Abstract: A valve actuator differential worm planetary gear drive provides forward or reverse motion to a valve stem, from an input from either a motor-driven worm or a handwheel driven worm, by using a plurality of planet gears to send motion to the sun gear. If the preference is to have the motor driven the valve primarily, the manual worm stays locked and the motor worm acts as a planetary arm. When it is desired to move the valve by hand, the motor gear is fixed and rotation of the handwheel worm gear transmits the power through the ring gear and the planet gears to the drive sleeve.
    Type: Grant
    Filed: March 24, 1988
    Date of Patent: January 30, 1990
    Assignee: Limitorque Corporation
    Inventors: Ivan E. Wilkinson, Charles L. Hylton, R. Gregory Pence