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 ?
In the closed position the doors are secured by internal, full-height lockable espagnolette bolts, which engage into the bottom and top track.
Access to each rail line is achieved by manually opening individual door sections, which are secured in place with lockable full height espagnolette bolts also acting as the pivot point for each pair of leaves.