Drive apparatus with primary and secondary no-back features

F - Mech Eng,Light,Heat,Weapons – 16 – H

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F16H 57/12 (2006.01)

Patent

CA 2172191

A linear ballscrew type actuator including a bi-directional no-back device having both primary and secondary no-back features is provided. The secondary no-back features only become active following a failure of the primary no-back features, thereby ensuring maximum reliability by precluding wear or fatigue of the secondary no-back components during normal operation of the actuator. The secondary no-back features are provided by secondary pawl mechanisms mounted at the distal end of an articulated eccentric arm. The angular position of the eccentric arm is utilized to annunciate the operational condition of the no-back device. Angular motion of the eccentric arm is utilized to trigger engagement of a secondary locking device, upon failure of the primary no-back features.

Actionneur linéaire à vis à billes comprenant un dispositif bi directionnel sans retour comportant des fonctions primaires et secondaires sans retour. Les fonctions secondaires sans retour deviennent actives seulement après une défaillance des fonctions primaires sans retour, assurant ainsi un maximum de fiabilité en empêchant l'usure ou la fatigue des composants secondaires sans retour durant le fonctionnement normal de l'actionneur. Les fonctions secondaires sans retour assurées par le deuxième mécanisme de cliquet monté à l'extrémité distale d'un bras excentrique articulé. La position angulaire du bras excentrique est utilisée pour annoncer la condition opérationnelle du dispositif sans retour. Le mouvement angulaire du bras excentrique est utilisé pour provoquer l'enclenchement d'un dispositif de verrouillage secondaire, en cas de panne des fonctions primaires sans retour.

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