Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Yutaka Toji0
Date of Patent
January 2, 2007
0Patent Application Number
108424600
Date Filed
May 11, 2004
0Patent Primary Examiner
Patent abstract
A hydraulic controller for working machine according to the present invention, which presupposes an electronic control system where an integrated bleed-off valve common to hydraulic actuators is used for bleed-off control and the bleed-off valve is controlled by the secondary pressure of a proportional solenoid valve controlled by a controller, is constituted to compensate supply of a pressure oil for the hydraulic actuators even if the secondary pressure of the proportional solenoid valve is stopped, by providing, at the bleed-off valve, a fail-safe position with a fail-safe path which opens with an opening having smaller area than an unload opening.
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