espagnolette

An espagnolette is a type of multi-point locking mechanism used mainly on casement windows and French doors. The device centers on a rigid metal bar or linked set of bolts that runs along the meeting edge of the sash and engages keeps in the frame when operated. When activated by a handle or crank, the bolts extend at multiple points, creating a secure seal.

Construction and operation: The mechanism typically uses a long bar connected to a hand crank or lever. Turning the handle slides the bar within the sash and frame, pushing bolts into upper, middle, and lower keeps. Some designs employ hooks or cams to pull the sash tight as the bolts engage. The arrangement distributes securing force and increases resistance to wind, impact, and tampering.

Applications and variants: Espagnolette locking is common on older European windows and doors, particularly French casements and double doors. It is often paired with hinges and weather stripping, and may be used with supplementary shoot bolts for added security. Modern hardware may integrate espagnolette action into a single multipoint mechanism with a key lock on the inside.

Maintenance and terminology: The term espagnolette denotes the locking bar system, and the broader family includes dedicated espagnolette bolts and locks. Regular maintenance involves cleaning, lubricating moving parts, and ensuring alignment of the sash to keep bolts properly engaging.