Device for locking Elevator Landing Door
It shall not be possible in normal operation to open the landing door (or any of the panels in the case of a multi-panel door) unless the car has stopped, or is on the point of stopping, in the unlocking zone of the door.
The unlocking zone shall not extend more than 0.2 meter above and below the landing level.
The hoistway door locking mechanism provides a means to mechanically lock each hoistway door and the elevator cannot leave a landing unless the doors are fully closed and secured.
They are also interconnected electrically to prevent operation of the elevator if any of the elevator’s hoistway doors are open. Should the doors be forced open, the interlock circuit will be broken, causing the elevator to immediately stop.
Each landing door shall be provided with a locking device satisfying the previous conditions. This device shall be protected against deliberate misuse.
Landing doors shall be capable of being unlocked from the outside with the aid of key , which fit the unlocking triangle (Hoistway Emergency Door Keys).
Elevator Cable - http://www.dazenelevator.com/product/elevator-safety-componet/elevator-cable/