Patent ID: 6622611
Filing Date: 2003-09-23
Classification: E21B,F15B

Abstract:
A hydraulic device comprising,two hydraulic actuators (1, 2), each comprising two couplings (1a, 1b, 2a, 2b) for entry and/or exit of a control fluid, only two pipes (6, 7) coupled to the two actuators (1, 2) and designed so that one of the two pipes supplies a pressurized fluid to a respective coupling of each actuator whilst the other of the two pipes discharges the fluid to the other respective coupling, and vice versa, in such a way that one (1) of the two actuators, is controlled so as to selectively produce a movement in one direction as well as in a reverse direction, and a selective reversing gate for reversing, between the two pipes (6, 7), the supplying of pressurized fluid and the discharging of the fluid, so as to control the direction of the movement of said one actuator (1), the device being characterized in that it comprises: means (8) for detecting a difference in pressure, between the pressurized fluid and the discharged fluid, and for transmitting a corresponding command, and between the reversing gate and the other (2) of said two actuators, auxiliary reversing means (9), for receiving said command from the detecting means (8) and for automatically coupling, as a function of said command, the one of said two pipes (6, 7), which is supplied with the pressurized fluid, to said respective coupling (2a) of said other actuator (2).