Accession Number : ADD014512

Title :   Yaw Fin Deployment Apparatus for Ejection Seat.

Descriptive Note : Patent, Filed 5 Jul 88, patented 20 Feb 90,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Tran, Anthony T ; Tung, Chi R ; Yost, Peter W

Report Date : 20 Feb 1990

Pagination or Media Count : 7

Abstract : A yaw fin deployment apparatus provides a continuous deployment force to the fin during the entire range of deployment. A shaft, a movable sleeve bearing for riding along the shaft, a strut connected between the sleeve bearing and the fin, and a lanyard for continuously pulling the sleeve bearing along the shaft are provided. The momentum created when the ejection seat separates from the aircraft is transmitted to the lanyard, to the sleeve bearing, and to the strut for deploying the fin. A pulley is attached to the seat and is located near the aft end of the shaft and guides the lanyard to assure that the actuation force exerted on the sleeve bearing is in a direction parallel to the axis of the shaft. When the fin is fully deployed, the lanyard separates from the sleeve bearing through a split ring at the bottom of the sleeve bearing. A primary spring-loaded latch located at the aft end of the shaft locks the fin in a fully deployed position. PAT-CL-244/122. (jes)

Descriptors :   *AIRCRAFT, ACTUATION, DEPLOYMENT, EJECTION SEATS, FINS, LOCKS(WATERWAYS), MOBILE, MOMENTUM, POSITION(LOCATION), RINGS, SEATS, SHAFTS(MACHINE ELEMENTS), SLEEVES, SPLITTING, YAW

Subject Categories : Aircraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE