Abstract: An installation for the continuous assembly of complementary component parts of a structural assembly constituting a door or window espagnolette bolt operating mechanism includes a main assembly circuit comprising at least one conveyor adapted to be advanced in steps and components part support plates fixed to this conveyor. Feed lines convey the component parts from storage units to the assembly circuit. Take-up devices transfer component parts from the feed lines to the conveyor. Component part assembly devices are located downstream of these take-up devices in the direction of movement of the conveyor. The installation further comprises devices for controlling the positioning and assembly of the component parts on the respective support plates.