CASEMENT WINDOWS
 
Description:
A casement window (or casement) is a window that is opening outwards and is attached to its frame by one or more hinges. Casement windows typically are hinged at the side, sometimes at the top or bottom. They are used singly or in pairs within a common frame, in which case they are hinged on the outside.

Operation:
They are opened with a lever or handle placed at around hand height or at the bottom and serve as window locks. A  stay, or friction hinge is necessary when the window opens outward, to hold the window in position despite wind. Window locks use lever handles.