Polster, Lieder, Woodruff & Lucchesi
Linear actuator with positive stop
 An improvement to a linear actuator (9) having a lead screw (15) received in a drive tube assembly (17) is provided in the form of a bushing (41) mounted on the end of the screw. The outer dimension of the bushing generally corresponds to the inner dimension of the tube. The bushing has a recess (53) formed in one face to accommodate a washer (55). A retaining ring (59) holds the bushing in place. The bushing serves both to prevent contact between the lead screw and tube to reduce noise during actuator operation, and as a positive stop to prevent disengagement of the lead screw from the drive tube assembly. 
Emerson Electric Co.
B Y F
B60N Y10T F16H
inventional additional inventional
Mark S. Jason J.
Amalfitano Hill