Sky light security alarm detector with weak link - guarantees triggering of alarm at central station by breakage of electric conductor laid along pivoted arm

摘要

A movable arm (3) coupled to the opening light (1) has one end running along a guide rail (4) fixed to the frame (2). An opening (6) allows the arm (3) to be uncoupled for window-cleaning. Forced entry ruptures a weak link (7) in a conductor (8) near the axis (9) to trigger the alarm. A switch can be fitted in the vicinity of the rotary joint on the frame, and connected to a central monitoring station. ADVANTAGE - Is adequately safeguarded against false alarms to allow roof light to be opened with gap of 15 cm for ventilation.