| 摘要 |
A linear actuator assembly including an axially moveable threaded shaft disposed within a rotationally driven housing which guides axial movement of the threaded shaft. A pair of oppositely disposed centrifugal members are pivotally mounted on the rotated member for movement from one engaged position with the threaded shaft through a disengaged position, where the shaft is free to move axially, to an opposite engaged position. The centrifugal members each have spaced half nuts and one pair of half nuts engage the threaded shaft upon rotation of the housing in one direction to move the shaft axially in the first direction and the other half nuts threadedly engage the shaft and move the shaft in the opposite direction upon rotation of the housing in the opposite direction. The limits of the threaded portion of the shaft are defined by lengths of reduced cross section. These lengths of reduced cross section limit the axial movement of the shaft as the half nuts disengage the threaded portion of the shaft by moving axially into one of the lengths of reduced cross section.
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