Patent GB-191413362-A (GB)
Title: Improvements in or relating to Telephone Exchanges.
Inventor: HULYMAN CARL AXEL WILHELM
IPC: H01H67/12
Filed: 1914-05-30
Granted: 1915-05-27
Abstract: 13,362. Hultman, C. A. W. June 2, 1913, [Convention date]. Automatic exchange systems.-The line and test wires of all the subscribers are brought together in an openly spaced bundle of rectangular cross-section, beneath which the line selectors are arranged in a row. To select a particular line, the wipers of a selector are first moved from front to back of the bundle till they are opposite the wires of a particular section of the subscribers, and are then raised into the bundle until they reach the wires of the wanted subscriber. The wires thus serve as the actual terminals of the selectors. The selectors may have a capacity of as much as 30,000 lines, means being provided for control- . ling each movement of the selector by several digits jointly, the front-to-back movement being controlled for instance by the ten-thousand. thousand, and units digits, while the vertical movement is controlled by the hundreds and tens digits. For this purpose, the impulses representing the different digits are delivered to separate registering-switches of the sort shown in Fig. 7, which connect ground to a number of sets of controlling-contacts in the selector. Construction of selector. The wiper carrier K, Fig. 8, can be given a lateral movement by means of a trolly V, which runs in guides s1, s2, s3, s4, and an independent vertical movement by means of a lift beam R0, on which the carrier rests by means of a roller. When a magnetic clutch is energized to clutch a driving- pulley R1 to a constantly-running shaft, the trolly V is moved laterally by a cord r1. The clutch-controlling circuit comprises three parallel branches which include sets of contacts l1, l2, l3 wired respectively to the ten-thousand, thousand, and units registering-switches, Fig. 7, which are set so as to ground a certain number of contacts in each series. The clutch circuit is maintained as long as either of the brushes f1, f2, f3 is on a contact l1, l2, l3 which has been grounded in this way. At the moment when the wiper carrier K arrives under the wires of the subscribers having the required tenthousand, thousand, and units digits, all three branches of the clutch circuit are opened and the trolly V comes to rest. A second clutch is then energized to rotate a pulley R3 driving a cord r2, which raises the lift-beam R0. This vertical movement is controlled, similarly to the lateral movement, by the hundreds and tens brushes f5, f6 and contacts l5, l6, and the wipers are thus brought to the wires of the wanted subscriber. The connexion between the wipers and the incoming circuits is made through the cord q. The subscribers' wires may either be fixed on the faces of insulating-plates or may be supported by plates through which they pass at right-angles. Circuit arrangements. The numerical impulses which arrive over the line-wire a, Fig. 6, control a line relay L1, and the operating- magnets A, B, C, D, E of the ten-thousand, thousand, hundred, &c., registering-switches, Fig. 7, are put successively under control of the relay L1 bv an auxiliary switch comprising the arms I, II, III, &c. The auxiliary switch is moved from one position to the next by a magnet R6, which is momentarily energized after each series of numerical impulses by a relay L2, which receives an impulse over the line-wire b. After the final series of impulses, however, the relay L2 energizes not the relay R6 but the relay R, which closes a contact k, in the circuit of a relay I, Fig. 10, which energizes the lateral-motion clutch of the selector and locks itself up in a circuit including the three brushes f1, f2, f3 in parallel. The relay I also energizes a relay R7, which locks itself up. The locking-circuit of the relay I is opened as soon as all three brushes f1, f2, f3 are on contacts l1, l2, l3 which have not been grounded by the registering-switches, and the de-energization of the relay I closes the circuit of a relay R, which energizes the vertical-motion clutch. When the brushes f5, f6 both arrive on contacts l5, l6 which have not been grounded by the registering-switches, the relay R, is unlocked and de-energizes the relay R8. In the meantime, the auxiliary switch is kept in the fifth position, the magnet R6 being maintained energized, first by the contact k1, which is opened, however, when the wiper-carrier begins its vertical movement, and then by the contact k of the relay R8. But now that the setting of the selector is completed, the contact k is opened, and the magnet R6 de-energizes, allowing the contact-arms to pass to the sixth or speaking position. Release of the registering-switches and auxiliary switch is effected by simultaneously energizing the line relays L1, L2, which closes the circuits of release magnets Y. Semi-automatic exchange systems.-In the Specification as open to inspection under Section 91 (3) (a), it is stated that the selectors may be controlled by operators' keyboards, which directly connect ground to the contacts l1, l2, &c., whereby the necessity for transmitting numerical sets of impulses is avoided. This subject-matter does not appear in the Specification as accepted.