Abstract: A door frame construction 10 including a hollow generally inverted U-shaped door frame member 20 having a pair of side channels 21, 22, and an overhead channel 23 provided with a plurality of illuminated exit sign units 12 and an emergency light unit 13. The exit sign units 12 and the emergency light unit 13 are electrically connected to one another by electrical wiring 101 disposed within the hollow door frame member 20 to provide integrated exit signage into the door frame member 20.

Abstract: A device discrimates between relatively shorter and relatively longer intervals by means of an interceptor member which:(a) if an interval between a displacement thereof away from and a displacement thereof towards an intercept station is less than a predetermined interval, intercepts a rotor at a first position; or(b) if said interval is greater than said predetermined interval, does not intercept the rotor which can then move to a second position.The member is movable by an electromagnetic mechanism, e.g. a coil and armature arrangement.Displacement of the member away from the station propels the rotor towards a stop. After striking the stop, the rotor returns towards the first position and, if not intercepted thereat, moves on to said second position.The device shown has a flag on the rotor for providing an indication of, e.g., operation. However, the device could be a relay, for example, instead of an indicator.