Safety locking device for secure prison cells

摘要

A safety-locking device is disclosed which is usable with a manual override system in a secure prison cell. The safety locking device is cooperable with the existing crank mechanism and geared together such that upon turning of the crank mechanism, the locking device rotates to a locked position corresponding to the position where the individual cells can be keyed open. The safety locking device is comprised of a small drive gear which is driven by said crank mechanism, and a large driven gear or sprocket driven by the small gear, by way of a chain. A locking mechanism has a locking plunger spring loaded against the back of the larger gear such that upon reaching the position where the individual cells can be keyed open, a locking plunger locks the larger driven gear and crank mechanism from further rotation. A release mechanism allows for further rotation.