Patent ID: 7891181

Claim:
A hydraulic unit, comprising: at least one working cylinder having a housing and a piston-rod unit movably guided in said housing; a hydraulic pump in fluid communication with said working cylinder for lowering said piston-rod unit in a first drive direction thereof and for raising said piston-rod unit in an opposite second drive direction thereof; a control coupled to said pump for actuating movement of said piston-rod unit; a hydraulic accumulator in fluid communication with said working cylinder receiving energy in said first drive direction and supplying energy to support displacement movement for said second driving direction; and a valve unit connecting and disconnecting said hydraulic accumulator in fluid communication with said working cylinder and actuated by said control, said valve unit being a directional control valve having a first switching position providing fluid communication between said hydraulic pump and a tank connection and having a second switching position providing fluid communication between said hydraulic pump and said hydraulic accumulator.