Doors which ordinarily open in one direction only, but which are required to open in the opposite direction in certain situations, can be fitted with a pivot hinge set and emergency release stop.
The situation might arise in relation to an inward opening door to a wheelchair accesible WC. It is important that the door can be opened outward in the event that someone falls against the back of the door.
The problem with outward opening doors is thet they can be dangerous if opening into a corridor or fire escape route. The Double Action pivot set eliminates this danger.