Patent ID: 6764126
Filing Date: 2004-07-20
Classification: B60J,F15B

Abstract:
A hydraulic actuating device for a cover and an associated lock for locking the cover in a the closed position, comprising:a hydraulic cover actuator for moving the cover between an open position and a closed position, a hydraulic lock actuator for moving the lock between a locked position and an unlocked position, the hydraulic cover actuator and the hydraulic lock actuator each comprising a housing in which there is an actuator space, which accommodates a piston and rod assembly which can slide to and fro and has a piston rod which projects out of the housing on one side, the piston delimiting a base-side chamber and a rod-side chamber in the actuator space, the housing being provided with a first and second connection for supplying and discharging hydraulic fluid, which connections are respectively in communication with an associated first and second opening which adjoin the actuator space and, in each position of the piston and rod assembly, are respectively in communication with the base-side chamber and the rod-side chamber, a reservoir for hydraulic fluid, a pump with a delivery port for providing pressurized hydraulic fluid, a single actuable hydraulic valve for controlling both the hydraulic cover actuator and the hydraulic lock actuator, wherein the hydraulic cover actuator is provided with a third opening which lies between the first opening and the second opening, and in that the third opening of the hydraulic cover actuator is connected, via a first connecting line, to the second connection of the hydraulic lock actuator, and the first connection of the hydraulic cover actuator and the first connection of the hydraulic lock actuator being connected to a common second connecting line, in which second connecting line the single actuable valve is accommodated, which in a first position connects the second connecting line to the reservoir and in a second position connects the delivery port of the pump to the second connecting line, and the second connection of the hydraulic cover actuator being in communication with the delivery port of the pump.