초록 ▼

An actuator assembly has two actuators mounted back-to-back such that their actuator rods are displaced in opposite directions. Each actuator has a spring embracing the rod between two slidable collars. The spring urges the collars apart towards stops on the rod and stops on the actuator housing, so

An actuator assembly has two actuators mounted back-to-back such that their actuator rods are displaced in opposite directions. Each actuator has a spring embracing the rod between two slidable collars. The spring urges the collars apart towards stops on the rod and stops on the actuator housing, so that, on failure of the actuator, the rod is displaced to a central position. The rod is driven by a motor which also rotates two discs of different diameters. Each disc has a notch in its edge which align only at the central position of the rod and allow a roller to drop into the notch. When the actuator fails, a solenoid releases a locking arm which engages the rollers, keeping them in the notches thereby preventing rotation of the discs and displacement of the rod.

대표청구항 ▼

Actuator means comprising a housing, a linear actuator member, means for displacing the actuator member along its length relative to the housing between a first position and a second position, means for returning the said actuator member on failure of said actuator means to a third, predetermined po

Actuator means comprising a housing, a linear actuator member, means for displacing the actuator member along its length relative to the housing between a first position and a second position, means for returning the said actuator member on failure of said actuator means to a third, predetermined position intermediate said first and second positions, and locking means for automatically locking said actuator member in said third predetermined position on failure of said actuator means, said locking means comprising a first rotatable locking member, means coupling said first rotatable locking member with said actuator member so that the locking member is rotated on linear displacement of the actuator member, a second locking member, and means mounting the second locking member to align with the first locking member and to engage therewith in locking engagement to prevent rotation of said first locking member and displacement of said actuator member in both directions only when said actuator member is in said third predetermined position.