crémone

Crémone is a type of window fastener, also known as a casement stay or espagnolette bolt. It consists of a rotating handle that operates a long rod. This rod has extensions at both ends that engage with keeps or sockets mounted on the window frame. When the handle is turned, the rod rotates, and the extensions secure the window in an open or closed position. This mechanism is commonly found on French doors and casement windows.

The design of the crémone allows for a secure locking mechanism and also provides ventilation by enabling the window to be held open at various positions. The visible handle and rod give it a distinctive architectural appearance, often used in traditional and historical building styles. Crémones are typically made from brass, bronze, or iron, and their finishes can vary to match the surrounding hardware. The operation is straightforward, involving a simple turn of the handle to engage or disengage the locking rods. This makes them a functional and decorative element for windows and doors.