Patents by Inventor Masataka Kawaguchi

Masataka Kawaguchi 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: 10023451
    Abstract: A forklift includes a forklift body having a front wheel and a rear wheel, a fork supported to the front of the forklift body so as to be capable of moving vertically via a mast, a lift cylinder capable of moving the fork up and down, a hydraulic pressure supply line capable of supplying hydraulic pressure to a head-side chamber in the lift cylinder, a hydraulic pressure exhaust line capable of exhausting hydraulic pressure from a rod-side chamber in the lift cylinder, and a changeover valve provided on the hydraulic pressure exhaust line, wherein a control device changes a pressure balance between hydraulic pressure on the head-side chamber and hydraulic pressure on the rod-side chamber in the lift cylinder by the changeover valve to restrict the operation of the lift cylinder, when a weight of a load on the fork exceeds a limit load weight.
    Type: Grant
    Filed: February 7, 2012
    Date of Patent: July 17, 2018
    Assignee: MITSUBISHI NICHIYU FORKLIFT CO., LTD.
    Inventors: Megumu Tsuruta, Masataka Kawaguchi, Kensuke Futahashi, Naohito Hashimoto
  • Patent number: 9150396
    Abstract: The electric-vehicle control device is used in an electric vehicle which is provided with a vehicle body having a driving tire and an axle shaft and with a driving motor which imparts torque to the driving tire. The electric-vehicle control device issues a motor control command to the driving motor. The electric-vehicle control device is provided with a control unit, and the control unit gives feedback control to the driving motor by vibration parameters indicating vertical vibration of the electric vehicle at the center of the axle shaft.
    Type: Grant
    Filed: April 12, 2010
    Date of Patent: October 6, 2015
    Assignee: MITSUBISHI NICHIYU FORKLIFT CO., LTD.
    Inventors: Ryuichi Umehara, Osamu Nakakita, Masataka Kawaguchi, Toshiyuki Honda, Wataru Mizunuma
  • Publication number: 20140241840
    Abstract: A forklift includes a forklift body having a front wheel and a rear wheel, a fork supported to the front of the forklift body so as to be capable of moving vertically via a mast, a lift cylinder capable of moving the fork up and down, a hydraulic pressure supply line capable of supplying hydraulic pressure to a head-side chamber in the lift cylinder, a hydraulic pressure exhaust line capable of exhausting hydraulic pressure from a rod-side chamber in the lift cylinder, and a changeover valve provided on the hydraulic pressure exhaust line, wherein a control device changes a pressure balance between hydraulic pressure on the head-side chamber and hydraulic pressure on the rod-side chamber in the lift cylinder by the changeover valve to restrict the operation of the lift cylinder, when a weight of a load on the fork exceeds a limit load weight.
    Type: Application
    Filed: February 7, 2012
    Publication date: August 28, 2014
    Applicant: MITSUBISHI NICHIYU FORKLIFT CO., LTD.
    Inventors: Megumu Tsuruta, Masataka Kawaguchi, Kensuke Futahashi, Naohito Hashimoto
  • Patent number: 8775026
    Abstract: A steering control device obtains a command steering reactive force according to a wheel angle based on a wheel angle and table data representing the correlation between the wheel angle and the command steering reactive force, and which controls an electric-control brake to make the steering reactive force equal to the command steering reactive force. The steering control device: obtains a correction coefficient according to vehicle state amounts based on the vehicle state amounts other than the wheel angle, which are detected by vehicle state amount detecting means, and table data representing the correlation between the vehicle state amounts and the correction coefficients; corrects the table data by using the correction coefficients; obtains a command steering reactive force according to the wheel angle based on the table data and the wheel angle; and controls the electric-control brake to make the steering reactive force equal to the command steering reactive force.
    Type: Grant
    Filed: April 9, 2009
    Date of Patent: July 8, 2014
    Assignee: Mitsubishi Nichiyu Forklift Co., Ltd.
    Inventors: Kensuke Futahashi, Masataka Kawaguchi, Yasunobu Igashima, Hiroyuki Iiyama, Ryota Adachi, Takaharu Hiroe
  • Patent number: 8573339
    Abstract: A hybrid industrial vehicle performs steering operation and the like during idling stop, without using a complicated mechanism. The hybrid industrial vehicle configured to transmit power of a first electric motor (23) and power of an engine (21) to a drive wheel (34) through a first gear train (32) comprises: a second electric motor (24) actuated when supplied with electric power from a battery (22); a first hydraulic pump (26) supplying pressure oil to a cargo handling hydraulic system; a second gear train (28) interposed among the engine and the second electric motor and the first hydraulic pump and capable of mutual power transmission among the engine, the second electric motor and the first hydraulic pump; a second hydraulic pump (27) supplying pressure oil to a steering hydraulic system; and a third electric motor (25) actuated to drive the second hydraulic pump when supplied with electric power from the battery.
    Type: Grant
    Filed: August 5, 2008
    Date of Patent: November 5, 2013
    Assignee: Mitsubishi Nichiyu Forklift Co., Ltd.
    Inventors: Kensuke Futahashi, Masataka Kawaguchi, Kiyomitsu Ogawa
  • Publication number: 20120253870
    Abstract: A maintenance plan formulation system formulates a plan for maintaining an industrial machine used to conduct a specific operation. The maintenance plan formulation system includes first measuring means, second measuring means, and a maintenance plan formulation device. The first measuring means measures a value of information which varies by causing the industrial machine to operate for a specific job. The second measuring means measures a value of information which varies by causing the industrial machine to operate for a job other than the specific job. The maintenance plan formulation device formulates a plan for maintaining the industrial machine on the basis of the values of information measured by the first measuring means and the second measuring means.
    Type: Application
    Filed: July 13, 2010
    Publication date: October 4, 2012
    Inventors: Yasuhiko Tsuru, Masataka Kawaguchi, Kiyoshi Enomoto
  • Publication number: 20120185121
    Abstract: The electric-vehicle control device is used in an electric vehicle which is provided with a vehicle body having a driving tire and an axle shaft and with a driving motor which imparts torque to the driving tire. The electric-vehicle control device issues a motor control command to the driving motor. The electric-vehicle control device is provided with a control unit, and the control unit gives feedback control to the driving motor by vibration parameters indicating vertical vibration of the electric vehicle at the center of the axle shaft.
    Type: Application
    Filed: April 12, 2010
    Publication date: July 19, 2012
    Inventors: Ryuichi Umehara, Osamu Nakakita, Masataka Kawaguchi, Toshiyuki Honda, Wataru Mizunuma
  • Patent number: 8167078
    Abstract: An object is to provide a work vehicle whose drive portion can be downsized.
    Type: Grant
    Filed: May 16, 2007
    Date of Patent: May 1, 2012
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Kensuke Futahashi, Yasutaka Fuke, Hideki Hashimoto, Masataka Kawaguchi, Kiyomitsu Ogawa, Hiroyuki Sugiura, Hiroyuki Kanazawa, Koichi Yamada
  • Publication number: 20110056755
    Abstract: An object of the present invention is to provide a hybrid industrial vehicle which can perform steering operation and the like during idling stop, without using a complicated mechanism.
    Type: Application
    Filed: August 5, 2008
    Publication date: March 10, 2011
    Inventors: Kensuke Futahashi, Masataka Kawaguchi, Kiyomitsu Ogawa
  • Publication number: 20110060503
    Abstract: A steering control device for imparting a steering reactive force to the steering wheel. The steering control device for fork lifts determines a command steering reactive force corresponding to the wheel angle from the wheel angle detected by a wheel angle sensor (41) and table data (60) representing the correlation between the wheel angle and the command steering reactive force and controls an electric brake (31) so that the steering reactive force is equal to the command steering reactive force. A correction coefficient (?1) corresponding to a vehicle state quantity and so forth are determined from the vehicle state quantity (e.g., the wheel angle difference (??)) other than the wheel angle detected by a vehicle state quantity detecting means (e.g., a steering wheel angle sensor (23)) and table data (52) representing the correlation between the vehicle state quantity and the correction coefficient. The table data (60) is corrected by using the correction coefficient (the inclination (?) is determined).
    Type: Application
    Filed: April 9, 2009
    Publication date: March 10, 2011
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Kensuke Futahashi, Masataka Kawaguchi, Yasunobu Igashima, Hiroyuki Iiyama, Ryota Adachi, Takaharu Hiroe
  • Patent number: 7770696
    Abstract: An energy recovering system of a hydraulic lift device for a battery operated industrial truck. With the system, working oil can be supplied to other hydraulic actuators while energy recovering operation is performed by the hydraulic lift device, and energy recovering efficiency is increased. A hydraulic motor (6) is disposed in a fluid path for recovering pressurized working fluid from a lift cylinder (1) via a control valve (10) to a working fluid reservoir tank (8) so that the hydraulic motor (6) is driven by the pressurized working fluid returning from the lift cylinder (1). The hydraulic motor (6) is connected to an electric motor (4) for driving a hydraulic pump (3), which supplies pressurized fluid to the lift cylinder (1), by means of a one-way clutch (7) which performs torque transmission only from the hydraulic motor (6) to the electric motor (4).
    Type: Grant
    Filed: February 15, 2006
    Date of Patent: August 10, 2010
    Assignees: Mitsubishi Heavy Industries, Ltd., Nippon Yusoki Co., Ltd.
    Inventors: Kensuke Futahashi, Hiroshi Satou, Masataka Kawaguchi, Fujio Eguchi, Toshiyuki Honda, Keizo Ogino, Shingo Yuguchi, Kazuhito Kawashima, Michio Akao
  • Patent number: 7770697
    Abstract: An energy recovering system in a hydraulic lift device of a battery operated industrial truck. With the system, working oil can be supplied to other hydraulic actuators while energy recovering operation is performed by the hydraulic lift device, occurrence of pressure pulsation in the working oil can be prevented, and energy recovering efficiency is increased. The hydraulic lift device comprises a lift cylinder (1) for lifting a fork F, an electric motor (4) rotated by power supply from a battery (5), a hydraulic pump (3) for supplying pressurized oil to the lift cylinder (1), a control valve (14) disposed in a pressurized oil supply path (23), and a controller (17).
    Type: Grant
    Filed: February 13, 2006
    Date of Patent: August 10, 2010
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Kensuke Futahashi, Hiroshi Satou, Masataka Kawaguchi, Tomohiro Akaki, Fujio Eguchi, Keizo Ogino, Shingo Yuguchi, Kazuhito Kawashima, Michio Akao
  • Publication number: 20100006380
    Abstract: A commercial vehicle in which the amount of energy collected by regenerative braking is increased and a decrease in reliability is prevented is provided.
    Type: Application
    Filed: November 8, 2007
    Publication date: January 14, 2010
    Inventors: Kensuke Futahashi, Masataka Kawaguchi, Munenobu Uchida
  • Patent number: 7582581
    Abstract: A subject for the invention is to provide an alkali-free glass which is capable of reducing or totally eliminating As2O3 and which has fewer bubble inclusion than that in the prior technology. The invention relates to an alkali-free glass which comprises SiO2 in an amount of from 40 to 70% by weight; Al2O3 in an amount of from 6 to 25% by weight; B2O3 in an amount of from 5 to 20% by weight; MgO in an amount of from 0 to 10% by weight; CaO in an amount of from 0 to 15% by weight; BaO in an amount of from 0 to 30% by weight; SrO in an amount of from 0 to 10% by weight; ZnO in an amount of from 0 to 10% by weight, each based on the total amount of said glass, and helium and/or neon in an amount of from 0.0001 to 2 ?l/g (0° C., 1 atm.).
    Type: Grant
    Filed: August 3, 2004
    Date of Patent: September 1, 2009
    Assignee: Nippon Electric Glass Co., Ltd.
    Inventors: Masataka Kawaguchi, Masataka Takagi
  • Publication number: 20090174538
    Abstract: A display device of a hybrid cargo handling vehicle and a hybrid cargo handling vehicle equipped with the display device are provided, with which whether operation is performed by engine drive or motor drive or engine plus motor drive and whether driving operation, i.e. energy consuming operation or energy recovering operation is performed is indicated on a monitor screen, and also fuel consumption rate of the engine, state of charge of the battery, and position of center of gravity of the vehicle are indicated on the monitor screen in both traveling and cargo handling operations, so that the operator is possible by monitoring the displayed indications to perform safe operation of the cargo handling vehicle with high efficiency and high cargo handling power without occurrence of slip down of the cargo or fall down of the vehicle.
    Type: Application
    Filed: August 23, 2007
    Publication date: July 9, 2009
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Naoki Shibata, Kumiko Shibata, Tomohiro Akaki, Masataka Kawaguchi
  • Publication number: 20090057065
    Abstract: A forklift which is capable of controlling overturning and a method of controlling safety against overturning for a forklift are provided. In a forklift having a controller (20) for controlling the traveling state of a vehicle, the controller (20) is characterized by estimating the traveling state at a predetermined time ahead and, when the vehicle velocity at that time exceeds a maximum allowable vehicle velocity before generating a likelihood of overturning, applying the brakes and, when a no-overturning state is achieved thereafter, releasing the brakes.
    Type: Application
    Filed: January 16, 2007
    Publication date: March 5, 2009
    Inventors: Tomohiro Akaki, Masataka Kawaguchi, Kensuke Futahashi, Fujio Eguchi, Shinjiro Murata
  • Publication number: 20090025990
    Abstract: An object is to provide a work vehicle whose drive portion can be downsized.
    Type: Application
    Filed: May 16, 2007
    Publication date: January 29, 2009
    Inventors: Kensuke Futahashi, Yasutaka Fuke, Hideki Hashimoto, Masataka Kawaguchi, Kiyomitsu Ogawa, Hiroyuki Sugiura, Hiroyuki Kanazawa, Koichi Yamada
  • Publication number: 20080128214
    Abstract: An energy recovering system in a hydraulic lift device of a battery operated industrial truck. With the system, working oil can be supplied to other hydraulic actuators while energy recovering operation is performed by the hydraulic lift device, occurrence of pressure pulsation in the working oil can be prevented, and energy recovering efficiency is increased. The hydraulic lift device comprises a lift cylinder (1) for lifting a fork F, an electric motor (4) rotated by power supply from a battery (5), a hydraulic pump (3) for supplying pressurized oil to the lift cylinder (1), a control valve (14) disposed in a pressurized oil supply path (23), and a controller (17).
    Type: Application
    Filed: February 13, 2006
    Publication date: June 5, 2008
    Applicants: Mitsubishi Heavy Industries, Ltd., Nippon YUSOKI CO., LTD.
    Inventors: Kensuke Tahashi, Hiroshi Satou, Masataka Kawaguchi, Tomohiro Akagi, Fujio Eguchi, Keizo Ogino, Shingo Yuguchi, Kazushi Kawashima, Michio Akao
  • Publication number: 20070278048
    Abstract: An energy recovering system of a hydraulic lift device for a battery operated industrial truck. With the system, working oil can be supplied to other hydraulic actuators while energy recovering operation is performed by the hydraulic lift device, and energy recovering efficiency is increased. A hydraulic motor (6) is disposed in a fluid path for recovering pressurized working fluid from a lift cylinder (1) via a control valve (10) to a working fluid reservoir tank (8) so that the hydraulic motor (6) is driven by the pressurized working fluid returning from the lift cylinder (1). The hydraulic motor (6) is connected to an electric motor (4) for driving a hydraulic pump (3), which supplies pressurized fluid to the lift cylinder (1), by means of a one-way clutch (7) which performs torque transmission only from the hydraulic motor (6) to the electric motor (4).
    Type: Application
    Filed: February 15, 2006
    Publication date: December 6, 2007
    Applicants: Mitsubishi Heavy Industries, Ltd., NIPPON YUSOKI CO., LTD.
    Inventors: Kensuke Futahashi, Hiroshi Satou, Masataka Kawaguchi, Fujio Eguchi, Toshiyuki Honda, Keizo Ogino, Shingo Yuguchi, Kazuhito Kawashima, Michiro Akao
  • Publication number: 20060160691
    Abstract: A subject for the invention is to provide an alkali-free glass which is capable of reducing or totally eliminating As2O3 and which has fewer bubble inclusion than that in the prior technology. The invention relates to an alkali-free glass which comprises SiO2 in an amount of from 40 to 70% by weight; Al2O3 in an amount of from 6 to 25% by weight; B2O3 in an amount of from 5 to 20% by weight; MgO in an amount of from 0 to 10% by weight; CaO in an amount of from 0 to 15% by weight; BaO in an amount of from 0 to 30% by weight; SrO in an amount of from 0 to 10% by weight; ZnO in an amount of from 0 to 10% by weight, each based on the total amount of said glass, and helium and/or neon in an amount of from 0.0001 to 2 ?l/g (0° C., 1 atm.).
    Type: Application
    Filed: August 3, 2004
    Publication date: July 20, 2006
    Inventors: Masataka Kawaguchi, Masataka Takagi