Patent GB-146336-A (GB)
Title: Improvements in automatic switch for distant control
IPC: H04Q9/00
Filed: 1920-07-02
Abstract: 146,336. Chauveau, L. L. E. April 3, 1919, [Convention date]. Electric selectors.-Relates to an electric selector for controlling at a distance boats, airships, projectors, large guns, switches, railway signals cr pumps. The device may also be employed as a switch for automatic telephony or telegraphy. The selector is controlled by sequences of signals of two different types sent by the operating-station. A sequence of signals of one type selects and partially closes the circuit of a magnet controlling the desired operation. A single signal of the second type next sent effects the complete closure of the circuit of the said magnet, which automatically closes its own circuit and prepares the supply circuit of the motors or other apparatus making the desired operation. Another consecutive signal of this second type effects the final closure of the said supply circuit. More than one operation may be prepared before the final executing signal is sent. Successive signals of the first type affect the operation of successive relays in a chain of relays, each relay, when actuated. cutting itself out of the circuit and putting into circuit the next. In the arrangement shown, positive or negative impulses may be sent from the operating-station by pressing the keys 3 or 3<1> respectively. Suppose it is desired to cause the two motors MR1 and MR2 to rotate simultaneously; the first in the direction governed by its operating magnet M4, the second in the direction governed by its operating magnet M2. Two positive impulses are first sent along the line wire 5. The first positive impulse causes the arm, carried by the moving coil 9 of the galvanometer 8 at the receiving station, to make contact between the points 11, 13. Relay P1 is thereby actuated and the contact b maintained closed by the part c1, which is locked by the armature of relay E2. On release of the key, the relay E1 is energized over a circuit including the contacts a, b of relay P1, the part c0 is released, relay PI is cut out of the circuit and relay P2 is cut in. The second positive impulse actuates relay P2 to lock its contact b, and on release of the key, locking-relay E2 is energized, cutting relay P2 out of the circuit and cutting in P3; the closure of contact 37 prepares the operation of magnet M2 by partially closing its circuit. A negative impulse is now sent and the contacts 11, 12 of the galvanometer 8 are closed. Relay EX1 is thereby energized, and closing contact 15 actuates magnet M2, which prepares the necessary connexion to motor MR2, and directly locks its own circuit. On the interruption of the first negative impulse relay E<1> is energized, cutting EX1 out of the circuit and cutting in EX2. In a similar manner to that already described, by transmitting two further positive impulses and one negative impulse, the necessary connexion to motor MR1 is prepared by closing contact 45 included in the circuit of magnet M4. When it is desired to operate the two motors, a further negative impulse is sent, which actuating the relay EX2 closes the contact 17 included in the supply circuit of the motors. The control may be interrupted or repeated as desired by the operation of the key 3<1>. The apparatus is reset by the first positive impulse following two or more consecutive negative impulses, causing the operation of the return to zero relay O, which breaks at 18 the circuit of the operating magnets M1, M2, M3, M4, and at 19 that of the relays P1, P2, P3, P4. The closure of the contacts 20 causes the release of the parts c which are locked, the liberation of part c<1> finally breaking the circuit of the relay O and leaving the selector ready to receive a new order. To indicate at the operating station whether a correct operation has been prepared, a galvanometer 25 is included between the line and ground when neither key is depressed. At the controlling station the locking relays E<1>, E2, E3, E4, when energized, in addition to preparing the circuits of the operating magnets, by closing the contacts d include varying portions of the resistance 23 in a potentiometer circuit including the coil 9, resistance 23 and battery 24. The potential across the coil 9 is thereby varied according to the operation prepared, and is indicated in the galvanometer 25. The characteristics of the galvanometers 25 and 8 are such that a current sufficient to cause the full deflection of 25 is sufficient to close contacts 11, 12 or 11, 13.