Patent GB-190428036-A (GB)
Title: Means for Automatically Connecting Up with each other the Subscribers to Telephone Exchanges.
Inventor: PETICKY JOSEF
IPC: H04M1/272
Filed: 1904-12-21
Granted: 1905-12-21
Abstract: 28,036. Peticky, J., Cizek, I., and Suchanek, F. Dec. 21. Telephone systems.-In an automatic exchange system, the subscribers' call apparatus at the exchange is designed to select a disengaged connecting-up apparatus, which seeks out the desired subscriber's line and makes the required connection. The number of connecting-up apparatus is determined by the number of conversations likely to be carried on at one time. Fig. 1 shows the apparatus at the subscriber's station, the same being shown diagrammatically in Fig. 28. The revoluble arm 3 carries contacts 4, 5, 6 over a number of contacts arranged in groups, of which the contacts 8 serve to operate the corresponding exchange call apparatus and thus select a connecting-up apparatus, the contact groups 9, 10, 11, 12 actuate this connecting-up apparatus to discover the required connection, the contacts 14, 20 make the speaking connection, and the contact groups 15, 16, 17, 18, 19 serve to bring the connecting - up apparatus back to its zero position when conversation is over. Each of the contact groups 9, 10, 11, 12 and 15, 16, 17, 18 is adapted to be covered by shields 21-28 so as to determine the number of operative contacts in their respective groups. If subscriber 2458 is to be called, three contacts in group 9, five in group 10, six in group 11, and nine in group 12 are uncovered, the extra contact in each group corresponding to the zero position on the connecting - up apparatus. The additional contacts 15<a>, 16<a>, 17<a>, 18<a>, 9<a>, 10<a>, 11<a>, 12<a> and the contacts 13, 19 are connected together, and serve to actuate the contact-device A in the connecting - up apparatus described later. The contacts 4, 5 are connected together but insulated from the contact 6. The contact groups 9-12 and 15-18 are connected together, and also to the contact 14 as shown in Fig. 28. When the arm 3 has moved through 180 degrees, it is held by a special stop-device shown in Fig. 5. When the arm 3 is against the second contact 13, it is arrested by a stop 36 on a pivoted lever 34, but, on removal of the receiver from the hook-lever 41, the lever 34 is moved in the direction of the arrow 38 and allows the arm 3 to fall against the stop 37, at the same time making the speaking circuit through the contacts 6, 14. When the receiver is hung up, the lever 34 is returned and the arm 3 continues its journey over the contacts 15-19. Fig. 8 shows the exchange call apparatus, comprising a contact-device and a lever mechanism. The contact-device consists of a wheel 45, actuated by the electromagnet 44 and carrying contacts 46 which slide over a fixed disc 47 having as many rows of contacts 48, 49, &c. as there are connecting- up apparatus. The lever mechanism comprises a movable lever 54 with contacts 55 ... 60 opposite contacts 62, 63, and 65 ... 68 on a second movable lever 61. The normal position of the contacts is shown in Fig. 8, but, when the lever 54 is attracted by the electromagnet 53, the contact 60 is broken and the others made. The levers 54, 61 are retained in this position by the lever 69, controlled by a magnet 70. This lever mechanism acts in conjunction with a similar mehanism, shown in Fig. 12, forming part of each connecting-up apparatus. The contact 79 of one connecting - up apparatus is connected with the contact 75 of the next, and so on. The connecting-up apparatus comprises contact-devices A, B, C, D, E, Fig. 23, and a number of contact-rods 82. The device A serves to connect up the electromagnets 90 ... 93 and 104 of the devices B, C, D, E, and of the rods 82 at the proper time. The contact-device A consists of a fixed disc 83 having a number of contacts, the function of which will appear later, and a lower movable disc having a row of contacts coupled in pairs so as to engage in succession the contacts on the disc 83 and connect them to their corresponding contact-rings 108, 109, &c. The contact devices B, C, D, E and rods 82 discover the required line, and are actuated in turn by the contact groups 9,10, 11, 12, Fig. 1. The devices C, E comprise fixed discs 118, 120, bearing one-hundred contacts 130, 125 and ten contacts 131, 126, beneath which are movable discs bearing contacts which serve to couple the contacts 131, 126 in turn with each of the ten contacts 130, 125 arranged near each contact 131, 126. The movable discs are actuated by electromagnets 91, 93. The contact-devices B, D each carry two groups 144, 138 of eleven contacts each, and also a contact-ring 139, which are in turn connected up by movable contacts on a disc rotated by the magnets 90, 92. The contacts 131, 126 on the devices C, E respectively, are connected in order to the contacts 144, 138 on the devices B, D. The contact-rods 82 serve for the actual connecting-up of the subscribers. Each rod carries onehundred contacts 151, and can be moved by the electromagnets 104 so as to engage one-hundred relative contacts 152 fixed underneath. The movable contacts are connected to the lines of the subscribers, so that there is one rod 82 for each hundred subscribers. The fixed contacts 152 are connected with the contacts 125 of the device E in such a way that the 1st, 101st, 201st, &c., fixed contacts are connected to the 1st contact 125, the 2nd, 102nd, 202nd, &c. contact to the 2nd contact 125, and so on. When the rods have been moved by the electromagnets 104 so that all the contacts engage with all the relative fixed contacts, the rod is held by a catch, which is removed when the electromagnet 105 is energized. Referring now to Fig. 28, let it be assumed that the contact groups 9 .. 12 are uncovered, as before explained, so as to call subscriber 2458. The arm 3 is allowed to rotate, and makes connection with the first contact of the group 8 and closes the circuit 156 from the battery 157, through contact 56 of the lever mechanism, electromagnet 44, the subscriber's call apparatus, and the arm 3 to earth. The wheel 45 of the exchange apparatus, Fig. 8, is thus rotated one step so that the contacts 46 engage the contacts 48, and, if these are in connection with a disengaged connecting-up apparatus, the circuit 158 is closed. If, however, the first connecting-up apparatus is engaged, the wheel 45 is rotated another step by the second contact in group 8, and so on until a suitable apparatus is found, and the circuit 158 of that apparatus is closed. This circuit passes from the battery 157 through the contacts 52 (closed by the magnet 44), magnet 53, contacts 46, 48 (or 49, 50, 51, &c.), magnet 74, and the contacts 76, 75 to the battery. The magnets 53,74 break the contacts 56, 76 so that the circuit 156 is no longer closed when the arm 3 passes over the succeeding contacts 8, but the contacts 57, 58, 59 are closed so that, when the arm 3 passes over the contact 9<a>, the circuit 159 is completed from the battery through the magnet 113, contacts 46, 48 (or 49 &c.), 58, 9<a>, and the arm 3 to earth. The magnet 113 is thus energized, and rotates the lower disc of the device A one step, so that the contact 86 makes the connections for actuating the device B. When the contact 4 comes in contact with the operative contacts in group 9, circuit 173 is successively completed from the battery through the contacts 103, 86, magnet 90, contact 109 in the device A, and the contacts 48 (or 49 &c.), 46, 57, 9, 4 to earth. The movable disc in the device B is thus turned as many steps as there are operative contacts 9. The arm 3 then connects with the contact 10<a>, closing the circuit 159 again and rotating the device A so as to make the connections for the device C. The operative contacts 10 then move this the required number of steps. In the same way, by the contacts 11<a>, 12<a>, the device A is rotated and makes the connections for the devices D, E, which are rotated by the operative contacts 11, 12. When the arm 3 passes over the first contact 13, the circuit 159 is again closed, and the device A is rotated so as to close the circuit 177 from the battery through the contacts 178, contacts 144, 130 already found in the devices B, C, magnet 104 corresponding to said contacts, and the contact 102 in the device A to the battery. The contact-rod 82, in this instance the 24th, is thus operated by the magnet 104 and closes all its hundred contacts. The device A is again rotated by the second contact 13 and completes the signalling-circuit 180. Current then flows from ground through the calling subscriber's telephone apparatus and automatic switch contact z<1> of the calling-generator z, contacts 6, 14, 57, 46, 48 (or 49, 50, 51, &c.), contacts 109, 102 in the device A, and the contacts 138, 125 corresponding to the particular number on the devices D, E to the connection in the rod 82, from which the current passes to the line of the called subscriber (circuit 181) through contacts 60, 20, 6 to earth. Both subscribers remove their receivers, whereby the arm 3 moves so as to come against the tooth 36, Fig. 5. When the receivers are hung up, the arm 3 continues its journey over contacts 15 ... 18 and 15<a>, 16<a>, 17<a>, 18<a>, whereby the device A is continually rotated so as to make the necessary connections so that the devices B, C, D, E are returned to the zero position by the operative contacts 15 ... 18. When the arm 3 reaches the first contact 19. the circuit 184 is completed through the magnet 105 and contacts 103, 111 in the device A, thus returning the rod 82 to zero position. Contact of the arm 3. with the second tooth 19 closes the circuit 185 through the magnet 81, contacts 101, 110 in device A, and the contacts 115, whereby the lever mechanism in Fig. 12 is replaced. At the. same time the circuit 186 is closed by the contacts 77, 80 coming together, thus energizing the magnet 70 and replacing the lever mechanism in Fig. 8. Should an attempt be made to call an engaged subscriber, the movement of the devices B, C, D, E of the second connecting-up apparatus complete