Patents by Inventor THOMAS D. MORRISON

THOMAS D. MORRISON 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).

  • Patent number: 11654960
    Abstract: A hydraulic system for controlling a pair of steerable caster wheels includes a left steering command valve, a right steering command valve, and a rear steering control valve. A supply pressure fluid circuit interconnects a pressure source and the rear steering control valve. A command valve supply fluid circuit interconnects the rear steering control valve with both the right steering command valve and the left steering command valve. A left side steering fluid circuit interconnects a left side actuator and the left steering command valve. A right side steering fluid circuit interconnects a right side actuator and the right steering command valve. A fluidic tie rod fluid circuit interconnects both the left side actuator and the right side actuator with the rear steering control valve. A tank return fluid circuit interconnects the rear steering control valve, the left and right steering command valves, and a tank.
    Type: Grant
    Filed: April 28, 2020
    Date of Patent: May 23, 2023
    Assignee: DEERE & COMPANY
    Inventors: David V. Rotole, Ryan J. Goodrich, Thomas D. Morrison, Andrew W. Baker, Tyler K. Farrington
  • Patent number: 11246255
    Abstract: A hydraulic system for controlling at least one steerable caster wheel of an agricultural machine includes a first actuator having a piston and including an inboard fluid port for supplying fluid to a first side of the piston to move the piston in a first direction, and an outboard fluid port for supplying fluid to a second side of the piston to move the piston in a second direction. A first fluid pressure equalizer is fluidically coupled to the first side actuator and operable to equalize fluid pressure over a period of time between the first side and the second side of the piston of the first side actuator.
    Type: Grant
    Filed: April 28, 2020
    Date of Patent: February 15, 2022
    Assignee: DEERE & COMPANY
    Inventors: Austin J. Karst, Thomas D. Morrison, David V. Rotole
  • Patent number: 11168711
    Abstract: A hydraulic system includes a first fixed displacement pump having a first pump output and a second fixed displacement pump having a second pump output. A first actuator requires a first required flow rate to perform a first function. A second actuator requires a second required flow rate to perform a second function. A combined flow control valve is controllable between a first state connecting fluid communication between the first fixed displacement pump and the tank so that only the second pump output is directed to the second actuator, and a second state disconnecting fluid communication between the first fixed displacement pump and the tank to combine the first pump output and the second pump output such that the combined first pump output and the second pump output is directed to the first actuator.
    Type: Grant
    Filed: October 24, 2019
    Date of Patent: November 9, 2021
    Assignee: DEERE & COMPANY
    Inventors: Thomas D. Morrison, Austin J. Karst
  • Publication number: 20210331738
    Abstract: A hydraulic system for controlling a pair of steerable caster wheels includes a left steering command valve, a right steering command valve, and a rear steering control valve. A supply pressure fluid circuit interconnects a pressure source and the rear steering control valve. A command valve supply fluid circuit interconnects the rear steering control valve with both the right steering command valve and the left steering command valve. A left side steering fluid circuit interconnects a left side actuator and the left steering command valve. A right side steering fluid circuit interconnects a right side actuator and the right steering command valve. A fluidic tie rod fluid circuit interconnects both the left side actuator and the right side actuator with the rear steering control valve. A tank return fluid circuit interconnects the rear steering control valve, the left and right steering command valves, and a tank.
    Type: Application
    Filed: April 28, 2020
    Publication date: October 28, 2021
    Inventors: DAVID V. ROTOLE, RYAN J. GOODRICH, THOMAS D. MORRISON, ANDREW W. BAKER, TYLER K. FARRINGTON
  • Publication number: 20210329824
    Abstract: A hydraulic system for controlling at least one steerable caster wheel of an agricultural machine includes a first actuator having a piston and including an inboard fluid port for supplying fluid to a first side of the piston to move the piston in a first direction, and an outboard fluid port for supplying fluid to a second side of the piston to move the piston in a second direction. A first fluid pressure equalizer is fluidically coupled to the first side actuator and operable to equalize fluid pressure over a period of time between the first side and the second side of the piston of the first side actuator.
    Type: Application
    Filed: April 28, 2020
    Publication date: October 28, 2021
    Inventors: AUSTIN J. KARST, THOMAS D. MORRISON, DAVID V. ROTOLE
  • Publication number: 20210123461
    Abstract: A hydraulic system includes a first fixed displacement pump having a first pump output and a second fixed displacement pump having a second pump output. A first actuator requires a first required flow rate to perform a first function. A second actuator requires a second required flow rate to perform a second function. A combined flow control valve is controllable between a first state connecting fluid communication between the first fixed displacement pump and the tank so that only the second pump output is directed to the second actuator, and a second state disconnecting fluid communication between the first fixed displacement pump and the tank to combine the first pump output and the second pump output such that the combined first pump output and the second pump output is directed to the first actuator.
    Type: Application
    Filed: October 24, 2019
    Publication date: April 29, 2021
    Inventors: THOMAS D. MORRISON, AUSTIN J. KARST