Patents by Inventor Ryuji Kitagawa

Ryuji Kitagawa 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: 11801840
    Abstract: A work vehicle includes an engine, a transmission to change a received rotational force to a rotational force at a gear ratio that corresponds to a desired vehicle speed and output the changed rotational force, a first operating tool to change the rotation speed of the engine and a deceleration rate of the transmission, a rotation speed controller to control the rotation speed of the engine based on an input provided to the first operating tool, and a second operating tool to receive a holding instruction to hold the rotation speed of the engine constant. In response to the holding instruction being inputted to the second operating tool, the rotation speed controller is configured or programmed to disable control of the rotation speed of the engine which control is based on the input provided to the first operating tool, and hold the rotation speed of the engine constant in accordance with the holding instruction.
    Type: Grant
    Filed: December 7, 2021
    Date of Patent: October 31, 2023
    Assignee: KUBOTA CORPORATION
    Inventors: Keiji Takahashi, Tatsuya Sakai, Naoya Okamoto, Ryuji Kitagawa, Tsuyoshi Gono
  • Publication number: 20220185282
    Abstract: A work vehicle includes an engine, a transmission to change a received rotational force to a rotational force at a gear ratio that corresponds to a desired vehicle speed and output the changed rotational force, a first operating tool to change the rotation speed of the engine and a deceleration rate of the transmission, a rotation speed controller to control the rotation speed of the engine based on an input provided to the first operating tool, and a second operating tool to receive a holding instruction to hold the rotation speed of the engine constant. In response to the holding instruction being inputted to the second operating tool, the rotation speed controller is configured or programmed to disable control of the rotation speed of the engine which control is based on the input provided to the first operating tool, and hold the rotation speed of the engine constant in accordance with the holding instruction.
    Type: Application
    Filed: December 7, 2021
    Publication date: June 16, 2022
    Inventors: Keiji TAKAHASHI, Tatsuya SAKAI, Naoya OKAMOTO, Ryuji KITAGAWA, Tsuyoshi GONO
  • Patent number: 9302582
    Abstract: A display system for a work vehicle includes a rotation speed display section for selectively displaying an engine rotation speed or a PTO rotation speed in a same display area, a display selection switch for outputting a display selection command, a discrimination display section for displaying a discrimination object for discriminating which of the engine rotation speed and the PTO rotation speed is being displayed and a display control section for selectively providing an engine rotation speed display signal or a PTO rotation speed display signal to the rotation speed display section based on the display selection command and providing the discrimination display section with a display signal for the discrimination object based on the display selection command.
    Type: Grant
    Filed: February 25, 2013
    Date of Patent: April 5, 2016
    Assignee: Kubota Corporation
    Inventors: Manabu Togo, Keita Ono, Ryuji Kitagawa, Koji Masumoto, Kengo Satoh
  • Patent number: 8967681
    Abstract: A locking apparatus for an openable window disposed in a cabin provided with a beam that has a first face and a second face includes a lock main body that is attached to the first face so as to be swingable between a closed position and a half-closed position, and a half-lock striker that is disposed on the lock main body. The half-lock striker is engageable with an operation piece provided on the openable window when the lock main body is at the half-closed position. The half-lock striker is positioned on a second face side of the beam at the closed position.
    Type: Grant
    Filed: September 4, 2012
    Date of Patent: March 3, 2015
    Assignee: Kubota Corporation
    Inventors: Koji Masumoto, Ryuji Kitagawa
  • Patent number: 8894135
    Abstract: A floor arrangement of a driver's section of a vehicle includes a floor frame, an acoustic absorbent placed on the floor frame and a floor mat placed on the acoustic absorbent. A wire harness is placed in an acoustic absorbent-free space formed between the floor frame and the floor mat. A protector is provided inside the acoustic absorbent-free space in the vicinity of the wire harness and extends upward from the floor frame. This protector is affixed to the floor frame and configured to receive a load applied to the floor harness from the upper side thereof.
    Type: Grant
    Filed: February 25, 2013
    Date of Patent: November 25, 2014
    Assignee: Kubota Corporation
    Inventors: Manabu Togo, Koji Masumoto, Ryuji Kitagawa, Norihide Iwata, Kengo Satoh
  • Publication number: 20130234452
    Abstract: A locking apparatus for an openable window disposed in a cabin provided with a beam that has a first face and a second face includes a lock main body that is attached to the first face so as to be swingable between a closed position and a half-closed position, and a half-lock striker that is disposed on the lock main body. The half-lock striker is engageable with an operation piece provided on the openable window when the lock main body is at the half-closed position. The half-lock striker is positioned on a second face side of the beam at the closed position.
    Type: Application
    Filed: September 4, 2012
    Publication date: September 12, 2013
    Applicant: KUBOTA CORPORATION
    Inventors: Koji Masumoto, Ryuji Kitagawa
  • Patent number: 7421917
    Abstract: A tractor with a PTO apparatus, comprises: a plurality of wheels; a vehicle body supported by the plurality of wheels; an engine supported on the vehicle body; a rear PTO shaft disposed at a rear of the vehicle body for transmitting power from the engine; a mid-PTO shaft disposed under the vehicle body for transmitting power from the engine; a PTO mode selecting device having a first position for transmitting power only to the rear PTO shaft, a second position for transmitting power to both the rear PTO shaft and said mid-PTO shaft, and a third position for transmitting power only to said mid-PTO shaft; a PTO clutch disposed on a transmission line upstream of said PTO mode selecting device and switchable between an engaged position and a disengaged position; and a restricting mechanism for preventing a change operation of said PTO mode selecting device when said PTO clutch is in the engaged position, and permitting the change operation of said PTO mode selecting device when said PTO clutch is in the disengage
    Type: Grant
    Filed: June 24, 2005
    Date of Patent: September 9, 2008
    Assignee: Kubota Corporation
    Inventors: Akifumi Nishino, Ryuji Kitagawa, Kiyokazu Nakanishi, Tsukasa Wada, Kenzo Ushiro
  • Publication number: 20060150757
    Abstract: A tractor with a PTO apparatus, comprises: a plurality of wheels; a vehicle body supported by the plurality of wheels; an engine supported on the vehicle body; a rear PTO shaft disposed at a rear of the vehicle body for transmitting power from the engine; a mid-PTO shaft disposed under the vehicle body for transmitting power from the engine; a PTO mode selecting device having a first position for transmitting power only to the rear PTO shaft, a second position for transmitting power to both the rear PTO shaft and said mid-PTO shaft, and a third position for transmitting power only to said mid-PTO shaft; a PTO clutch disposed on a transmission line upstream of said PTO mode selecting device and switchable between an engaged position and a disengaged position; and a restricting mechanism for preventing a change operation of said PTO mode selecting device when said PTO clutch is in the engaged position, and permitting the change operation of said PTO mode selecting device when said PTO clutch is in the disengage
    Type: Application
    Filed: June 24, 2005
    Publication date: July 13, 2006
    Applicant: Kubota Corporation
    Inventors: Akifumi Nishino, Ryuji Kitagawa, Kiyokazu Nakanishi, Tsukasa Wada, Kenzo Ushiro
  • Patent number: 6879261
    Abstract: An operator presence sensing apparatus for a seat of a vehicle includes a base member (7, 8) for supporting the seat (6), and a relay member (9) extending vertically between the base member and the seat. The seat is oscillatable about a pivot axis (X) extending in a transverse direction in the base member. The relay member is pivotably supported at one end thereof by the pivot axis and at the other end by the base member through a cushion spring (10). A seat lift-up spring (12) is disposed between an underside of the seat and the base member for receiving part of the weight of the seat. The seat unoccupied by the operator is oscillated to a floating position lifted from the relay member by the lift-up spring.
    Type: Grant
    Filed: March 20, 2003
    Date of Patent: April 12, 2005
    Assignee: Kubota Corporation
    Inventors: Akifumi Nishino, Ryuji Kitagawa, Kenzo Ushiro, Hiroki Fukudome
  • Publication number: 20040090338
    Abstract: An operator presence sensing apparatus for a seat of a vehicle includes a base member (7, 8) for supporting the seat (6), and a relay member (9) extending vertically between the base member and the seat. The seat is oscillatable about a pivot axis (X) extending in a transverse direction in the base member. The relay member is pivotably supported at one end thereof by the pivot axis and at the other end by the base member through a cushion spring (10). A seat lift-up spring (12) is disposed between an underside of the seat and the base member for receiving part of the weight of the seat. The seat unoccupied by the operator is oscillated to a floating position lifted from the relay member by the lift-up spring.
    Type: Application
    Filed: March 20, 2003
    Publication date: May 13, 2004
    Applicant: KUBOTA CORPORATION
    Inventors: Akifumi Nishino, Ryuji Kitagawa, Kenzo Ushiro, Hiroki Fukudome