Projected hinges are a type of door hinge designed to allow the door to swing clear of the frame when opened fully. They are commonly used in situations where space is limited, such as in narrow corridors or rooms with obstacles near the door's swing path. Projected hinges work by having an extended knuckle that moves the door away from the frame as it opens. This design prevents the door from colliding with nearby objects or walls, making them a practical solution for tight spaces.