Patent ID: 6193002
Filing Date: 2001-02-27
Classification: B62D,F15B

Abstract:
An actuator for accomplishing the swinging motion of a swinging arm, the actuator comprising:two cylinders fixed to the swinging arm and using a pressurized medium, arranged to swing the swinging arm around a rotation axis by connecting each cylinder at its one end to the swinging arm and at its other end to a structure in relation to which the swinging arm is arranged to pivot,a pressurized medium system to which the piston chambers and piston rod chambers of the cylinders are connected for supplying pressurized medium to and from the cylinders the system comprising a supply line connected with a feeding pump, a return line connected with a tank, and two connecting lines connected with the piston chambers and the piston rod chambers of the cylinders,wherein the control of the pressurized medium flow into the cylinders is implemented by one or several control valves, in a way that pressurized medium is supplied from the supply line either (a) into both cylinders while they are connected in parallel to said supply line by said one or several control valves or (b) to only one of the cylinders, the supply line being connected by said one or several control valves simultaneously to the piston chamber and the piston rod chamber of the same cylinder.