Patent ID: 6546325
Filing Date: 2003-04-08
Classification: E02F,F15B

Abstract:
A device for controlling a working arm of a working machine comprising:a releasing means for releasing a pressurized fluid feed/drain circuit of an actuation cylinder of a working arm device at a predetermined pressure lower than a set pressure of a cylinder relief value provided for said feed/drain circuit; and a control means for controlling the opening/closing of said releasing means, wherein said working arm device comprises a turnable arm member, a turning member mounted on the arm member so as to freely turn, an arm member actuation cylinder for actuating said arm member, a turning member actuation cylinder for actuating said turning member, and stoppers for limiting the turning ends of said turning member, and said control means operates said releasing means in a state where said turning member is in contact with said stopper, said turning member actuation cylinder is not in operation and said arm member actuation cylinder is in operation.