摘要 |
<p>The invention relates to a no-back device for a mobile element actuating device comprising a screw shaft having first (3, 5, 7, 9, 11, 15, 19) and second (4, 6, 8, 10, 12, 16, 18) braking means each comprising a ratchet wheel (5, 6), these ratchet wheels being mounted opposite one another so that the first braking means are adapted for resisting an unwanted movement of the screw shaft in a first direction, and the second braking means are adapted for resisting an unwanted movement of the screw shaft in an opposite direction. The no-back device is characterized in that it also comprises means (25, 26) for detecting the state of the rotation of the ratchet wheels and comprises indicating means for furnishing, according to the state of the rotation of the wheels, an indication concerning the operating state of the no-back device.</p> |