Patent GB-255100-A (GB)
Title: Selective control at a distance
IPC: H04Q9/16
Filed: 1926-07-10
Abstract: 255,100. Compagnie pour la Fabrication des Compteurs et Materiel d'Usines Ó Gaz, and Soc. dite l'Action Ó Distance. July 10, 1925, [Convention date]. Void [Published under Sect. 91 of the Acts]. Selective distant-control systems.-Anyone of a number of two-position switches is selectively closed or opened by an impulse train consisting of a characteristic number of short impulses followed by a long final impulse. The number of impulses selects the switch and determines the position to which it is to be operated and the long impulse causes the operation. Fig. 1 shows the apparatus at the control station and Figs. 2, 3 and 7 show receiving apparatus associated with a single mercurv switch 43. Transmitting apparatus. In the apparatus shown in Fig. 1, for opening and closing a single switch, code wheels c', c<2> are driven by a motor 1 through one revolution when one or other of the pushes b<1>, b' is operated, the circuit of the motor being opened at the end of the revolution by a circuit interrupter 5, 6. When a push is operated the corresponding electromagnet e<1> or e<2> closes the contacts m<1>, n<1> or m<2>, n<2>, to maintain the motor circuit after release of the operated push, and prepare a circuit through the corresponding mercury, switch a<1>, a and the field coils 8 of an electric generator 9. During the revolution, the code wheel operates the switch to make and break the circuit of the field coils 8 and cause the transmission of a characteristic number of short impulses followed by a long impulse over the lines 10, 11. Additional circuit breakers at the distant station may be operated by additional code wheels mounted on the common shaft 4. Receiving apparatus. The transmitted impulses energize electromagnets (not shown) which drive an induction disc 12 mounted on a shaft 13. A pinion 15 gears with a wheel 16 mounted on a spindle 17 which carries a U-shaped bracket 21. The bracket 21 supports a spindle 22 which carries a ratchet wheel 23 and a member 36 having two diametrically opposed pins 37, 38, one or other of which, according to its position relatively to the wheel 16, is adapted to operate a frame 41 and tilt the circuit breaker 43. A wheel 32 mounted on the shaft 13, carries a pin 33 which operates the ratchet wheel 23 through one step upon the receipt of each impulse. Normally the receiver occupies the position shown in Fig. 3. Upon the receipt of a short impulse, the disc 12 is rotated through a small arc and the ratchet wheel 23 is moved by the bracket 21 into the path of the pin 33 and is operated thereby through one step. A pawl 31 carried by the bracket prevents backward movement of the ratchet wheel. When the short impulse ceases, the bracket 21 and wheel 16 carried by the spindle 17 are returned to their normal positions by a spring 18. The pin wheel 32 is also returned to its normal position. The effect of the first short impulse is, therefore, to cause the movement of the ratchet wheel 23 and the member 36 through one step and to allow the other parts of the receiver to restore to normal. Subsequent short impulses operate the member 36 step-by-step in a similar manner. The final long impulse operates the ratchet wheel 23 through a further step and positions the member 36 in a radial direction relatively to the wheel 16 with one or other of the pins 37, 38 facing outwardly depending upon the number of impulses transmitted. The disc 12 continues to turn under the influence of a long impulse, and the outwardly directed pin 37 or 38 is brought into engagement with the frame 41 to rock the circuit breaker 43 in the appropriate direction. Near the end of a complete revolution of the wheel 16, a member 40 withdraws the pawl 31 and allows the ratchet wheel 23 and the member 36 to return to their normal positions under the influence of a spring 39. Upon the termination of the long impulse the other parts are also returned to their original positions. In the receiving apparatus shown, the ratchet wheel has ten teeth and the member 36 is fixed relatively to the wheel so that the pins 37, 38 are placed in their operative position by two and seven short impulses respectively, together with the long final impulses. Additional operations may be effected by additional receivers in which the pins 37, 88 are placed in their operative positions by trains of impulses having 0 and 5, 1 and 6, 2 and 7, &c. short impulses. In the modification shown in Fig. 7, a pin 50 on the disc 49 is positioned under a projection 46 on a lever 44 pivoted on the wheel 16 by the ratchet wheel, so as to move the pin 37 into the plane of the frame 41. In a further modification, the pins 37, 38 may be replaced by contacts which are adapted to close electric circuits.