Patent GB-190911497-A (GB)
Title: Device for Automatically Connecting Up the Subscribers of a Telephone Exchange.
Inventor: PETICKY JOSEF
IPC: H04M1/272
Filed: 1909-05-14
Granted: 1910-05-05
Abstract: 11,497. Peticky, J., Suchßnek, F., and Cizek, I. May 14. [Addition to 28,036/04.] Automatic exchange systems. - In an automatic-exchange telephone system in which a connexion between the calling and called subscribers is established through a switch individual to the calling-line and through two co-ordinate selectors somewhat resembling the ordinary Strowger switches, the selection, as well as the actuation, of idle first and second selectors and connectors is effected by current impulses sent from the calling-station by the rotation of the impulsetransmitter, in a manner resembling that described in the parent Specification and in Specification 25,826/05. The speaking circuit includes one linewire with an earth return. Subscriber's impulse-transmitter. The clockwork-driven shaft 7, Fig. 1, carries four arms 6 having pivoted thereto four levers 2, 3, 4, 5, one arm of each of which carries sliding contacts 52 adapted to move over two sets of ten contacts 51, 53, while the other arm of each lever bears an extension 11 designed to engage respectively with one of four pins 16, 17, 18, 19 inserted in holes in the plate 250 according to the digits in the number of the subscriber wanted. The top row of holes 12 corresponds to "thousands," the second row 13 to "hundreds," and so on, and the pins 16, 17, 18, 19 are shown as inserted to call subscriber 4825, Fig. 1 being a back view of the apparatus. The clock-work is wound up by the depression of the lever 125, which, when it reaches its lowest position, engages a pin 128, and rocks the levers 127, 130 so as to move the latter lever away from an extension 131 on an arm 132 carried by the shaft 7. As the shaft rotates, the contact 52 on the lever 2 first passes over the ten contacts 51 sending over one line-wire intermittent currents which cause the subscriber's individual switch to select an idle first selector. The contact 52 then passes over the contacts 53, thereby sending currents over the other line-wire to actuate this first selector, until the extension 11 engages the pin 16, thereby rocking the lever 2 and raising the contact 52, which is kept in its raised position by a spring catch 10<1> until released by a trip 20. The contact 52 on the lever 3 now comes into action, passing over the contacts 51 and sending currents over the first line-wire to cause the first selector to find an idle second selector in the selected group. The contact 52 then moves over the contacts 53, sending currents over the second line-wire to operate this second selector, until the extension 11 on the lever 3 engages the pin 17, whereupon the lever 3 is rocked, and its contact 52 raised out of action. The contact 52 on the lever 4 similarly causes the selection of an idle connector and then its actuation to select the " tens " row containing the desired contact. The fourth lever 5 is reversed on its support, with the result that only the number of impulses is sent from the contacts 51 over the first line-wire which is necessary to select the desired contact in the selected row. The lever 5 and its contact 52 is shown broken away in Fig. 1, but it is similar to the other levers 2, 3, and 4. In the position for conversation, the shaft 7 is arrested by the engagement of an extension 134 with a pin 137 on a stirrup 135, pivoted at 136 and provided with a catch 138. During conversation, a hook 139 on the switchhook 140 engages the catch 138, and, on the hanging-up of the receiver, the stirrup 135 is rotated so as to release the extension 134, and the shaft 7 moves into its original position. The function of the contacts 80, 81, 82, 83 will be clear from the description of the system as a whole. Subscriber's individual switch at the exchange. The contacts 55, 57, 59, Fig. 18, are carried by a toothed sector 150, which is actuated by a magnet 21 through a lever 152 and a pawl 151. Each movement of the lever 152 closes a contact 85 in a test circuit, which is completed through a magnet 28 if the contacts 55, 57,59 are at that moment resting upon the terminals 54, 56, 58 of an idle first selector. The energizing of the magnet 28 breaks the circuit of the magnet 21, and so arrests the movement of the sector 150. The apparatus is returned to its zero position by a spring 155 when the pawls 151, 153 are raised by a lever 163 attached to the armature 259 of a release magnet 37, the circuit of which is completed by a relay 36, the contact 89 being maintained closed by a hook 164 until the sector has returned to its zero position. The function of contacts 86, 87, 88 will be explained later. Construction of selectors. The first and second selectors are identical in construction, and are similar to the connector, the principal differences being in the arrangement of the numerous contacts. Fig. 24 is a side elevation of a first selector. The moving contacts 61, 63, 65 are carried by a toothed segment 169 adapted to be turned about an horizontal shaft 167 by the magnet 22 through the lever 171 and pawl 170. The shaft 167 and the segment are carried by a framework 175 which is secured to a second toothed segment 176, mounted on a vertical shaft 168 and adapted to be rotated by the magnet 23. The sets of fixed contacts 60, 62, 64 are carried on a curved surface 166. Each movement of the pawl-lever of the horizontal segment 176 opens and closes a contact in a test circuit, which is completed through the magnet 30 if the terminals 61, 63, 65 are at that moment resting upon the terminals of an idle second selector. The energizing of the magnet 30 breaks the circuit of the magnet 23, aud thereby arrests the movement of the sector 176. The apparatus is returned to its zero position when the detents and actuating-pawls of the two segments are raised by a lever 191 connected to the armature of the release magnet 39, the circuit of which is completed by a relay 38, the contact 96 being maintained closed by a hook 193 until the vertical segment returns to its zero position. The function of the other magnets and contacts will be clear from the description of the system as a whole. General operation. Fig. 43 shows the operation of the system as a whole, S denoting the substation apparatus, Z the subscriber's individual switch at the exchange, ZWI and ZWII the first and second selectors, and V the connector. The battery leads for the batteries 120, 121, and 122 are repeated at the right side of each set of leads shown, an additional battery 123 and leads being shown on the extreme right of the Figure. Assuming that it is desired to call subscriber No. 4825, the pins 16, 17, 18, 19 are inserted in the corresponding holes, and the sub-station apparatus set in motion as previously described. At this stage, the contacts 80, 81, 83 are open and contact 82 is closed. Individual switch. As the contact 52 on the arm 2, Fig. 1, passes over the contacts 51, current impulses pass from the battery 120 through the contact 87, magnet 21, contacts 51, 50, and 82 to ground, thereby stepping the contacts 55, b7, 59 over the contacts 54, 56, 58, leading to the first selectors. The contact 85 is closed each time the magnet 21 is energized ; the contact 86 is closed when the magnet 28 is energized, and remains closed until the magnet 37 is energized ; and the contact 87 is opened when the magnet 28 has been energized and de-energized, and is closed again when the magnet 37 is energized. The contact 90 in an idle selector is normally closed, so that, as soon as connexion is made with an idle selector, current flows from the battery 121 through the contact 90, magnet 29, contacts 54, 55, magnet 28, and contact 85 back to the battery. This circuit is broken when the contact 85 is opened by the magnet 21, but the energizing and de-energizing of the magnets 28, 29 (a) opens the contact 90 so that the first selector tests 'engaged' to other subscribers, and (b) closes contact .86 and opens contact 87 in the circuit of the magnet 21 so that additional impulses from the calling station cannot influence the switch Z. First selector. When the contact 52 reaches the contacts 53, five impulses of current (one more than the 'thousands' digit) pass from the battery 120 through the magnet 22, contacts 92, 56, 57, 53, 50, 82 to ground and back to the battery. The contact 91 is closed when the vertical segment 169 leaves its zero position ; the contact 92 is opened when the horizontal segment 176 leaves its zero position; the contact 93 is closed by the magnet 30 and opened by the magnet 39; the contact 94 is opened when the magnet 30 has been energized and de-energized, and is closed again by the magnet 39 ; contact 97 is closed and opened each time the magnet 23 is operated. The magnet 22 operates the vertical segment, causing the contacts 61, 63, 65 to move to the row of contacts leading to selectors of the fourth thousands' group. The subsequent impulses sent by arm 3 pass over the contacts 51, 86, 55, 54, 91, closed by the movement of segment 169, magnet 23, and contact 94 to the battery 120. The contacts 61, 63, 65 are then moved by the magnet 23 until they engage the contacts of an idle second selector, whereupon current passes from the battery 121 through the contacts 98, magnet 31, contacts 60, 61, magnet 30, and contact 97 back to the battery. The energizing and de-energizing of magnets 31, 30 (a) opens contact 98, whereby the second selector tests 'busy' to other first selectors, and (b) closes contact 93 and opens contact 94, thus cutting-out the magnet 23 and preventing further actuation of the selector. Second selector. The selection of the row of terminals leading to connectors of the desired 'hundreds' group, and the selection of an idle connector in that group proceeds in exactly the same manner under the control of the contacts 53 passed over by the arm 3 and the contacts 51 passed over by the arm 4. Connector. During the movement of the arm 4 over the contacts 53, three impulses pass from the battery