Patent ID: 9732769
Date: 2017-08-15
CPC Classifications: B64C,F15B

Claim:
1. A servo-control having at least one movable cylinder and a stationary power rod, the power rod having one piston per cylinder, each piston defining a chamber referred to as a “retraction” chamber and a chamber referred to as an “extension” chamber in a casing of the cylinder, each cylinder including a hydraulic directional control valve provided with at least one hydraulic inlet suitable for being connected to a fluid delivery system and at least one hydraulic outlet suitable for being connected to a fluid discharge system, each hydraulic valve of a cylinder comprising at least one hydraulic distributor slide movable within the hydraulic valve in order to put each chamber of the cylinder on request into fluid flow communication with the hydraulic inlet or the hydraulic outlet, the hydraulic valve having a control shaft that is rotatable about a longitudinal axis, the servo-control including an input lever situated outside each cylinder, the input lever being suitable for being connected to a linkage for generating a movement order for the servo-control, wherein the control shaft is connected to the distributor slide so that a rotary turn of the control shaft causes the distributor slide to move, the input lever being connected to the control shaft and being movable with a first movement to cause the control shaft to turn, the servo-control including a stationary abutment member secured to at least one of the cylinders, the abutment member having at least a first abutment surface, the input lever including a stop portion co-operating with the abutment member, the servo-control including movement means for moving the input lever in a second movement in longitudinal translation from a first position to a second position and vice versa as a function of a predetermined condition, the first abutment surface limiting press-free travel of the stop portion during a first movement to a first amplitude solely when the input lever is in the first position.