Patent ID: 6516595
Filing Date: 2003-02-11
Classification: A01B,A01D,Y10S

Abstract:
A harvesting machine with front-mounted harvesting attachment that is pivotable about a shaft running transversely to the direction of travel and capable of lifting when an obstacle is detected comprising:an overpressure valve; a control valve; an electrical circuit including a sensing device and electrical signal lines connected to the overpressure valve and the control valve; at least one double-acting hydraulic piston and cylinder unit operatively connected to the control valve, having a first cylinder chamber and a second cylinder chamber, arranged on the harvesting attachment; and a hydraulic fluid storage tank operatively connected to the control valve; and wherein the control valve is associated with the sensing device in such a way that: when the sensing device is not operated, the first cylinder chamber is in fluid communication with the second cylinder chamber by the control valve; and when the sensing device is operated, fluid communication between the first cylinder chamber and the second cylinder chamber is interrupted by the control valve and the second cylinder chamber is in fluid communication with the storage tank.