A casement window is a window that is attached to its frame by one or more hinges at the side. They are used singly or in pairs within a common frame, in which case they are hinged on the outside. Casement windows are often held open using a casement stay. Windows hinged at the top are referred to as awning windows, and ones hinged at the bottom are called hoppers.
Casement Windows Overview:
Casement windows were common before the sash window was introduced. They were usually metal with leaded glass, which refers to glass panes held in place with strips of lead called cames (leaded glass should not be confused with lead glass, which refers to the manufacture of the glass itself).
These casement windows usually were hinged on the side, and opened inward.
By the start of the Victorian era, opening casements and frames were constructed from timber in their entirety. The windows were covered by functional exterior shutters, which opened outward. Variants of casement windows are still the norm in many European countries.
They are sometimes opened with a crank, lever, or cam handle, which is placed around hand height or at the bottom and serves as a window lock. A crank, stay, or friction hinge is necessary when the window opens outward, to hold the window in position despite wind.
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