Abstract: A mechanism for providing a multi point bolting action to secure a door or other leaf movable within a frame is disclosed. The mechanism comprises a drive gear and an axle gear mounted to rotate about substantially the same axis. The idle gear is arranged to rotate in one sense when the drive gear rotates in the other sense. The mechanism also comprises at least one first member arranged to move between a thrown position and a retracted position when the drive gear rotates, and at least one second member arranged to move between a thrown position and a retracted position when the idle gear rotates. The first and second members are each provided with a rack held in intermeshing engagement with the appropriate gear.