| 摘要 |
An actuator includes a rotary input member 6, linear output member 64, 42, 11, means 40, 42 for converting the rotary input to the linear output and lock means 56 movable to a release state when the input member rotates. The output may be a ram 11 driven to extend and retract by a rotating lead screw 40. The lead screw 40 may be coupled with the rotating input shaft 6 via a lost-motion drive sleeve 30 connected with the input shaft by cooperating threads 28 so that rotation of the drive shaft causes both axial and rotational movement of the drive sleeve. The ram 11 may be locked in its retracted position by several radially-extending locking keys 56, one end of which engage an extension sleeve 64 fixed with the ram and the other end of which are engaged by a lock sleeve 50. Rotation of the input shaft 6 may cause the drive sleeve 30 to move axially and engage the lock sleeve 50, thereby pulling it to one side and allowing the locking keys 56 to move radially out and disengage the extension sleeve 64 to allow it to extend. The actuator may be used with doors or panels in an aerospace application. |
