espagnolette bolt

cremone bolt, cremorne bolt

A type of hardware for locking French windows or the like; a rotating handle actuates sliding rods which move in opposite directions, extending from the edges of the window into sockets that are fixed in the frame.
References in periodicals archive ?
The espagnolette bolt incorporates a bottom guide, which when withdrawn, enables door leaves to be moved aside to allow access for wider vehicles.
In the closed position the doors are secured by internal, full-height lockable espagnolette bolts, which engage into the bottom and top track.