Locking device for a door, window or the like

A locking device for a door, window or the like having a frame and edge plate in the frame, comprising:

• a main lock box;
• at least one supplementary lock box;
• and
• at least one drive rod connecting said at least one supplementary lock box to said main lock box, wherein:
• said main lock box includes a latch freely displaceable between a latching position and a retracted position, and each supplementary lock box includes a latch bolt freely displaceable between a latching position and a locking position, and displacement means for displacing said latch bolt past its latching position into its locking position,
• the displacement of said latch of said main lock box and said latch bolt of each supplementary lock box is similarly directed in the direction of an associated edge plate in the door frame, the window frame or the like structure,
• each said supplementary lock box further includes a blocking element, and
• said latch bolt is retained in its latching position by said blocking element, and upon closure of the door said blocking element releases said latch bolt, so that said latch bolt assumes its locking position when the door is closed and extends through the associated edge plate in the door frame, the window frame or the like.