Condition Sensed Is Working Member Speed Or Working Fluid Pressure Of Another Motor (i.e., Fluid Pressure Or Flow To Or From Expansible Chamber Of The Other Motor) Patents (Class 91/517)
  • Device for sequentially supplying several hydraulic motors
    Patent number: 4179981
    Abstract: A fluid supply circuit for supplying three motors includes means for sequentially connecting two of the motors to the supply conduit of the third motor as the pressure in the supply conduit rises through first and second threshold levels. The circuit includes a manual override for suppressing the automatic sequential action. The circuit is applied to the control of the booms and bucket of a hydraulic excavator, and provides for semi-automatic digging.
    Type: Grant
    Filed: May 11, 1978
    Date of Patent: December 25, 1979
    Assignee: Poclain
    Inventor: Victor Yeou