INPROVEMENTS IN OR RELATING TO BUILDING STRUCTURES

摘要

A central locking system for a building having at least one window or door, the system comprising a central control unit in communication with a storage means for retaining pressurised fluid, the storage means being in fluid communication with at least one locking mechanism operable in response to a signal from the central control unit to the storage means to move between an inoperative position in which the opening and closing of the associated door or window is unimpeded and an operative position in which the opening and closing of the door or window is impeded.