Patent ID: 8276841
Filing Date: 2012-10-02
Classification: B64C,F15B

Abstract:
1. A hydraulic actuator, comprising: a cylinder with a first inflow, a first outflow, a second inflow, and a second outflow for a hydraulic fluid; a closure device for closing the second inflow and second outflow in a direction of an outflow; a resistance device for generating flow resistance; a piston that is movably held in the cylinder; a piston rod connected to the piston and protruding from the cylinder; a first non-return valve connected to the first inflow for preventing the outflow of the hydraulic fluid through the first inflow; and a second non-return valve connected to the first outflow and connected in series with the resistance device for closing the first outflow when the hydraulic fluid is fed in through the first inflow; wherein the resistance device is designed to subject the hydraulic fluid flowing through the first outflow to flow resistance, and wherein the closure device is connected to the piston and is equipped, in a region between a switching position and an end position of the piston, to close the second inflow and outflow in the direction of outflow, and to open it between an initial position and a switching position.