Types of mechanism (2)

Sliding doors
It is often useful to have doors which slide along tracks, often for space or aesthetic considerations.
A bypass door is a door unit that has two or more sections.
The doors can slide in either direction along one axis on parallel overhead tracks, sliding past each other.They are most commonly used in closets, in order to access one side of the closet at a time.
The doors in a bypass unit will overlap slightly when viewed from the front, in order not to have a visible gap between them.
Doors which slide between two wall panels are called pocket doors.
Sliding glass doors are common in many houses, particularly as an entrance to the backyard.
Such doors are also popular for use for the entrances to commercial structures.
A tambour door is made of narrow horizontal slats and "rolls" up
and down by sliding along vertical tracks and is typically found in entertainment centres and cabinets.