Patents by Inventor Naoto Sannomiya

Naoto Sannomiya 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 recovery system for construction machine and construction machine using the same
    Patent number: 6502499
    Abstract: A hydraulic recovery system for a construction machine comprises a recovery valve for supplying at least a part of a hydraulic fluid from a rod-side line, through which the hydraulic fluid is drained from a rod-side hydraulic chamber of an arm hydraulic cylinder, to a bottom-side line through a variable throttle, and a throttle valve for returning the remaining part of the hydraulic fluid, which is not recovered, from the rod-side line to a hydraulic reservoir through a variable throttle. Opening areas of those variable throttles are controlled depending on an arm flow rate supplied from hydraulic pumps to the arm hydraulic cylinder.
    Type: Grant
    Filed: September 26, 2001
    Date of Patent: January 7, 2003
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Naoto Sannomiya, Sotaro Tanaka
  • Hydraulic recovery system for construction machine and construction machine using the same
    Publication number: 20020108486
    Abstract: A hydraulic recovery system for a construction machine comprises a recovery valve for supplying at least a part of a hydraulic fluid from a rod-side line, through which the hydraulic fluid is drained from a rod-side hydraulic chamber of an arm hydraulic cylinder, to a bottom-side line through a variable throttle, and a throttle valve for returning the remaining part of the hydraulic fluid, which is not recovered, from the rod-side line to a hydraulic reservoir through a variable throttle. Opening areas of those variable throttles are controlled depending on an arm flow rate supplied from hydraulic pumps to the arm hydraulic cylinder.
    Type: Application
    Filed: September 26, 2001
    Publication date: August 15, 2002
    Inventors: Naoto Sannomiya, Sotaro Tanaka