ALEXANDRIA, Va., June 9 -- United States Patent no. 12,287,186, issued on April 29.
"Safe-and-arm device" was invented by Yong Peng Tan (Singapore), Soo Chew Sie (Singapore) and Siwei Huang (Singapore).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention describes a safe-and-arm device, mechanism or assembly (160) for a projectile (100,102) equipped with a second-stage propellant (124). The second-stage propellant (124) is ignited after the projectile has been ejected out from a launcher barrel. A lockpin (190), being urged by a spring (194), is responsive to ignition of the second-stage propellant; after the lockpin (190) and spring (194) sense and respond to the second propulsion, an unbalan...