Patent GB-190102453-A (GB)
Title: Improved Automatic Fire and other Alarm System
Inventor: MCGLOIN FELIX
Filed: 1901-02-05
Granted: 1901-04-20
Abstract: 2453. McGloin, F. Feb. 5. Alarms, burglar and like.-Relates to an automatic alarm system which, in case of a disturbance of electrical circuits in a building by fire, burglars, or otherwise, first sends a call to a telephone either in the building or at the telephone exchange, and then a message from a phonograph stating the locality and nature of the trouble. In the arrangement shown diagramatically in Fig. 1, there are two complete independent circuits marked "first "circuit" and "second " circuit." The first circuit contains battery 56, an electromagnet 57, and contacts] on a rotary switch 55. The second circuit contains a battery 58, an electromagnet 59, and also contacts on the switch 55. In parallel between the two circuits are an electromagnet 61 and a number of thermostats a normally open. In case of fire, the thermostats a are closed and the electromagnet 61 is energized by the batteries 56, 58, thereby attracting an armature 62 and closing a circuit containing electromagnets 19, 53 and a battery 63. The magnet 53, when energized, attracts a lever armature 51, thereby closing a break 54 in a primary telephone circuit 13, and releasing the mechanism 52, 5, which rotates the cylinder 4 of a phonograph. The magnet 19, when energized, attracts a lever armature 28, and thereby removes the diaphragm or reproducer 9 from operative position. The action of the motor mechanism on the phonograph is shown on a larger scale in Fig. 4. A wheel 42 with a single tooth 46 is rotated by the motor mechanism and advances the wheel 44 by one tooth each revolution, until the stop 48 comes in contact with the end 49 of the lever 41, which is at the moment in the position shown by dotted lines, and throws it into the position shown in full lines. The leading screw 29 has in the meantime traversed the reproducer 8 along the cylinder of the phonograph and closed the primary telephone circuit 13, Fig. 1, by turning the switch 55 through the link 65, lever 66, and link 67. The movement of the lever 41 into the position shown in full lines closes at 7 the circuit of a telephone call consisting of an interruptor 6 or the like for ringing the bells of the subscriber's instrument or operating an annunciator at the central station, disengages the sliding carriage of the phonograph from the leading screw, and throws both reproducers clear of the cylinder, by means of the cam 32. A spring 50 then brings the carriage back to its initial position, and one revolution of the wheel 42 breaks the call circuit and throws the leading screw again into gear with the carriage. The reproducer 8 communicates a firealarm message indicating locality to the telephone 12, which, through the primary circuit 13, now completely closed at 54 and 55, transmits the message by induction to the secondary telephone circuit 15 connected to the subscriber's instrument 2 and the central station. In cases of trouble other than fire, it is assumed that the first circuit or the second circuit will be broken. If, for example, the second circuit is broken, the electromagnet 59 is de-energized, the lever armature 59<a> springs back and closes a circuit which includes the magnet 53, the battery 63, and the switch 69. The magnet 53 is thus energized and starts the phonograph, which communicates a "trouble" message from tho reproducer 9 to the telephone 12 after giving the call as already described. The switch 69 is rotated by the carriage of the phonograph and ratchet gear so as to break the circuit of the magnet 53 in three traverses of the carriage and stop the repetition of the "trouble" message. In case a fault should occur at any point in the first and second circuits, an electromagnet 72 is energized owing to the fact that one terminal of its coil is earthed at G. The armature of the magnet 72, when attracted, closes a circuit which gives the " trouble" signal on the phonograph.