DE335282C - Remote release for electric fire alarms - Google Patents

Description

In the main patent 318058 is a system for remote triggering of electrical fire alarms described with the help of automatic and manually operated secondary alarms, when line control and battery are centralized by the secondary detectors and tripping magnets with their connecting lines in a closed-circuit control standing ring line are connected in such a way that in the event of a wire break at any point in the line network in per se known Way a wire break relay switches on a signal. In the event of a wire break in the connecting cables to achieve a signal with certainty between the trigger magnet and the secondary detector, a resistor is connected upstream of the tripping magnet, through which the quiescent current flows in the event of a wire break, through which the current is weakened enough to trigger the wire break relay in this case as well.

With automatic secondary detectors

now the contact springs with very little pressure on each other, so that the There is a risk that the springs will be brought apart by vibrations occurring in the company short interruptions in the connection line between the secondary detector and the trigger magnet, which can also cause the sensitive wire break relay to drop out, causing the wire break signal would be switched on, although there is no wire break at all.

According to the invention, these false wire break signals are now prevented in that A delay relay switched on between the wire break relay and the wire break signal is that only with a long pulse, i.e. with a prolonged anchor drop of the Wire break relay, responds and only then creates the circuit for the wire break signal.

The drawing illustrates a shell processing example according to the invention.

The armature k 'of the wire break relay k in the control center closes a contact I of a circuit in which a battery m with a delay relay η is switched on when the wire break relay is de-energized. The armature p of the latter controls a contact q of a circuit in which the wire breakage signal lamp r and s are the alarm.

In the event of short interruptions in the connection line e between a tripping magnet d and a secondary detector f due to the interruption of the secondary detector contact due to vibrations or the like, the armature k 'of the wire break relay k will drop out, but will immediately be pulled back in because the interruption on the secondary detector does not persist . The closing of the circuit of the delay relay η caused by the dropping of the armature k ' is not of sufficient duration to cause the latter to respond, so that no wire break signal is given either. Such a signal occurs

only if the wire break relay k has been de-energized for a longer period of time as a result of a wire break in
lines A or e.

Claims (1)

Patent claim: Remote triggering for electrical fire alarms according to the main patent 318058, ge characterized by a persistent between Drahtbjruchrelais (k) and open-circuit signal (r, s) switched-delay relay (s) to vo prevent signaling in a short time interruptions of the connecting line (s) at the secondary detectors (/ "). 1 sheet of drawings. BERLIN. PRINTING IN THE HÖICHSDRUCKEREl.