Patents by Inventor Riki Fujita

Riki Fujita 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).

  • Hydraulic circuit for working machine
    Patent number: 8713931
    Abstract: A working vehicle, wherein flows of hydraulic oil delivered under pressure from two or more hydraulic pumps are joined together and the joined hydraulic oil can be taken out. A working vehicle is provided with two hydraulic pumps independent of each other and adapted to deliver hydraulic oil under pressure, a mode switching valve (230) capable of being switched to a flow joining position (K) at which flows of the hydraulic oil delivered under pressure by the two hydraulic pumps are joined together, PTO ports (260, 261) out of which the hydraulic oil is taken, and a PTO switching valve (240) provided downstream of the mode switching valve (230) and switching flow of the hydraulic oil so that the oil can be delivered under pressure to the PTO ports (260, 261).
    Type: Grant
    Filed: August 5, 2009
    Date of Patent: May 6, 2014
    Assignee: Yanmar Co., Ltd.
    Inventors: Kunihiko Sakamoto, Riki Fujita, Masaaki Yamashita, Nagahiro Ogata, Yousuke Yamashita
  • Hydraulic Circuit For Working Machine
    Publication number: 20120048409
    Abstract: A working vehicle, wherein flows of hydraulic oil delivered under pressure from two or more hydraulic pumps are joined together and the joined hydraulic oil can be taken out. A working vehicle is provided with two hydraulic pumps independent of each other and adapted to deliver hydraulic oil under pressure, a mode switching valve (230) capable of being switched to a flow joining position (K) at which flows of the hydraulic oil delivered under pressure by the two hydraulic pumps are joined together, PTO ports (260, 261) out of which the hydraulic oil is taken, and a PTO switching valve (240) provided downstream of the mode switching valve (230) and switching flow of the hydraulic oil so that the oil can be delivered under pressure to the PTO ports (260, 261).
    Type: Application
    Filed: August 5, 2009
    Publication date: March 1, 2012
    Applicant: YANMAR CO., LTD.
    Inventors: Kunihiko Sakamoto, Riki Fujita, Masaaki Yamashita, Nagahiro Ogata, Yousuke Yamashita
  • Hydraulic Circuit For Working Machine
    Publication number: 20110168283
    Abstract: A working vehicle, wherein flows of hydraulic oil delivered under pressure from two or more hydraulic pumps are joined together and the joined hydraulic oil can be taken out. A working vehicle is provided with two hydraulic pumps independent of each other and adapted to deliver hydraulic oil under pressure, a mode switching valve (230) capable of being switched to a flow joining position (K) at which flows of the hydraulic oil delivered under pressure by the two hydraulic pumps are joined together, PTO ports (260, 261) out of which the hydraulic oil is taken, and a PTO switching valve (240) provided downstream of the mode switching valve (230) and switching flow of the hydraulic oil so that the oil can be delivered under pressure to the PTO ports (260, 261).
    Type: Application
    Filed: August 5, 2009
    Publication date: July 14, 2011
    Applicant: YANMAR CO., LTD.
    Inventors: Kunihiko Sakamoto, Riki Fujita, Masaaki Yamashita, Nagahiro Ogata, Yousuke Yamashita