High Security Internal Locking System.
Patent, Filed 29 May 84, patented 13 May 86,
DEPARTMENT OF THE NAVY WASHINGTON DC
Pagination or Media Count:
A locking system that consists of two locking mechanisms protected by a drill resistive shutter plate. The shutter plate can be rotated to expose a first lock which when unlocked allows it to be further rotated to uncover the second lock. Upon unlocking the second lock, the drive for the main bolt can then be actuated.
- Couplers, Fasteners and Joints