US1374201A - Selector - Google Patents

Description

J. A. HALL.

SELECTOR.

APPLICATION FILED SEPT. 19, I919.

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JOHN A. HALL, OF BAYSIDE, NEW YORK, ASSIGNOR T0 WESTERN ELECTRIC GOM- PMQ'Y, INCORPORATED, OF NEW YORK, N. Y., A COE?ORATION OF NEW YURK.

SELECTOR.

Specification of Letters Patent.

Patented Apr. 12, 1921.

Application filed September 19, 1919. Serial No. 324,918.

To all whom it may concern Be it known that 1, JOHN A. HALL, a citizen of the United States, residing at Bayside, Long Island, in the county of Queens, State of New York, have invented certain new and useful Improvements in Selectors, of which the following is a full, clear, concise, and exact description.

This invention relates to electrical selectors or impulse responders consisting of relays which are energized in succession to select a certain circuit.

The object of the invention is to improve the arrangements of this kind previously used, such, for instance, as that shown in Patent No. 1,279,811 of September 24, 1918, to S. B. illiams, Jr.

In accordance with this invention a previously energized selecting relay is deenergized upon the beginning rather than the end of the impulse for energizing the nest relay whereby an economy in current consumption is efiected.

The accompanying drawing shows diagrammatically an embodiment of the inven tion.

The selectable circuits numbered 30, 37, 38 and 39, and here shown as single wire circuits, are connected to front contacts of switching relays 10, 17, 18 and 19 respectively. A selector of this kind might, with slight modifications, be adapted for use in a telephone system such as disclosed in United States Patent No. 1,262,? 52 to H. P. Clausen, the switching relays replacing the keys shown therein, thus permitting of the use of an ordinary subscribers station and calling dial and resulting in a considerable saving in the cost and labor of wiring and cabling since the switching relays could be placed at a central point. The selector normally consists of twenty switching relays, only eight being shown, arranged in pairs, each pair including what may be called an impulse relay and a holding relay. It is obvious, however, that any number might be used, that being limited only by the number of impulses that could be sent.

A Stepping relay 6 is bridged across a pair of conductors leading to a subscribers station A having an impulse sender 1 located thereat. Upon energlzation of stepping relay 6, a slow acting relay 7 is energized which completes the impulse circuit to the selector over the conductor 5 and the holding circuit over the conductor 4. Relay 7, being slow-to-release, does not release its armatures during the sending of impulses.

in considering the operation of the system, suppose it is desired to select the second circuit numbered 38 on the accompanying drawing. Upon removal of the receiver at the substation A from the switchhook, the loop to relay 6 is closed and relay 6 is energized. Upon energization of relay 6, its armature is attracted and a circuit is formed for slow-acting relay 7 over ground, armature and front contact of relay 6, winding of relay 7 to grounded battery. Relay 7 upon energization, attracts its armatures, thus closing its contacts to which the impulse conductor 5 and holding conductor 1 are connected. The impulse sender is then operated to send the number of impulses corresponding to'the circuit desired.

Upon the first interruption of the line circuit, the armature of relay 6 drops back and a circuit is completed from ground, armature and back contact of relay 6, inner armature and front contact of relay 7, impulse conductor 5, normal contacts of inner left armatures of relays 10, 17 and 18, back contact and armature of relay 20, winding of impulse relay 19 to grounded battery. Relay 19 attracts its armature and prepares a circuit for the energization of relay 20 over ground, outer armature and front contact of relay 7, holding conductor 4, outer left-hand armature and back contact of relay 18, front contact and inner armature of relay 19, winding of relay 20, winding of relay 19 to grounded battery. Relay 20 is, however, shunted through its armature and normal contact to ground at the armature and back contact of the stepping relay 6, at this moment. I

Upon the subsequent closing of the line circuit, relay 6 is again energized and relay 20 is. therefore, energized in series with relay 19 over the circuit above traced, and through the movement of itsarmature, prepares a circuit for the energization of impulse relay 18.

Upon the next interruption of the line circuit, the armature of relay (3 again drops back and another impulse is transmitted over conductor 5, the circuit being established from ground, armature and back contact of relay 6, inner armature and front contact of relay 7, impulse conductor 5, normal contacts of the inner left-hand armatures of relays 10, 17 and 18, armature and front contact of relay 20, armature and back contact of relay 21 and winding of impulse relay 18 to grounded battery. Relay 18 is energized and immediately through the normal contact of its inner left'hand armature breaks the circuit just described and substitutes therefor. a circuit through the alternate contact of its inner left-hand armature, armature and back contact of relay 21 and winding of relay 18 to grounded battery. Thecontacts at the inner left-hand armature are of the mak'e-betore-break type. Relay 18 in attracting its armatures breaks the holding circuit for relays 19 and 20. Relay 18, upon energization, prepares a circuit for holding relay 21 over the following path: grounded battery, winding of relay 18, winding of relay 21, inner right-hand armature and front contact of relay 18, back contact and outer left-hand armature of relay 17, conductor 4, front contact and outer armature of relay 7 to ground. Relay 21 is, however, shunted through its armature and normal contact to ground at the stepping relay at this moment. Upon the cessation of the second impulse over the impulse circuit, relay 6 is again energized and relay 21 is energized over the circuit above traced and through the movement of its armature prepares the circuit for the energiza-tion of the next impulse relay 17 At the beginning of the second impulse over the impulse .circuit, relay 18 was energized and closed a circuit at its outer righthand armature and front contact from ground to the desired circuit 38. Over the holding conductor 4 relays 21 and 18 are held energized and the connection to the selected circuit 38 is maintained until the subscriber at sub-station A replaces the receiver on the hook which interrupts the line circuit, thus deenergizing relay 6. Deenergization of relay 6 opens the circuit to relay 7, whichdeenergizes. thus releasing its armatures and opening the holding circuit leading to the selector. \Vhen the holding circuit is opened, relays 21 and 18 deenergize, the connection to the selected circuit 38 is opened and the selector is again ready for use.

What is claimed is:

1. A selector comprising a series of switch-- energizing av previously energized relay upon the beginning of the impulse tor energizing the next one of said relays.

2. A selector comprising a series of switching relays, a plurality of selective lines controlled by said relays, an impulse circuit for energizing the relays in succession, means whereby each relay after having been operated is deenergized on the beginning of the impulse energizing the next relay, and a holding circuit operable after the selector has been set to a fixed selective position.

3. A selector comprising a series of switching relays, a plurality of selective lines controlled by said relays, an impulse circuit for energizing the relays in succession, means whereby each relay after having been operated is deenergized on the beginning of the impulse energizing the next relay, a holding circuit operable after the selector has been set to a fixed selective position, and means for restoring said selector to normal position.

4. A selector comprising a series of pairs of switching relays, each pair including an impulse relay, an impulse circuit for energizing the impulse relays in succession, and means for de'c'nergizing a previously energized impulse relay on the beginning of the impulse energizing the next impulse relay.

5. A selector comprising a series of switching relays arranged in pairs, each pair including an impulse relay and a holding relay, an impulse circuit for energizing the impulse relays in succession, a holding circuit for energizing the holding relays in succession, and means for deenergizing a previously energized impulse relay on the beginning of the impulse energizing the next impulse relay.

6. A selector comprising a series of switching relays arranged in pairs, each pair in cluding an impulse relay, a plurality of selective lines controlled by said impulse relays, an impulse circuit for energizing the impulse relays in succession, means whereby each impulse relay after having been operated is denergized on the beginning of the impulse energizing the next impulse relay, and a holding circuit operable after the selector has been set to a fixed selective position.

In witness whereof, I hereunto subscribe my name this 12th day of September A. D., 1919.

JOHN A. HALL.

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