US1307688A - Telephone system - Google Patents

Description

F. A. L-UNDQUIST. TELEPHONE SYSTEM. APPLICATION FILED DEC.,2. I9I6'.

1 ,307, 688, Y Patented J 1111-9 24, 1919 Myer; fox g mh/r' 'AI Lumquiaf,

UNITED 'STTE ATENT OFFIC.

FRANK A. LUNDQUIST. OF NEW YORK, N. Y'.. ASSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

TELEIHONE SYSTEM.

Application filed December 2. 1916.

To r17! whom it may concern:

lie it known that l] FRANK A. Ltxnor is'r, a citizen of the l'nited States. residing at New York; in the county of New York and State of New York, have invented certain new and useful Improvements in 'l elcphoi'ie Systems, of which the following is a full, clear. concise. and exact description.

This invention relates to telephone systems, and more particularly to automatic switches employed in such systems.

The object of this invention is the provisionofa new and improved automatic switch of increased capacity which may be direetively'controlled by series of impulses.

The main feature of this invention is the provision of a selective switch having a plurality of sets of terminals and a plurality of sets of brushes arranged to be directively moved into engagement with certain sets of terminals under the control of an impulse transmitter, and means operated under the Control of the impulse transmitter irrespective of the number of impulses transmitted for selecting the set of brushes to be used.

Although the principles of the invention are herein shown applied to av connector switch, they may with the usual modification, heapplied to a selector switch.

The invention is illustrated in the accompanying drawing in which Figure 1 shows a side elevation of a connector switch, and a circuit arrangement by which the switch may be controlled and Fig. 2 shows a perspective view of the operating parts of a sender for controlling the operation of the switch.

The switch herein disclosed is arranged to have ten vertical or group selecting positiens and ten rotary or line selecting posi tions.

A and B designate two banks of contacts or terminals of 100 lines each. with which two sets of brushes a and 7) cooperate. The b1llSl1GS"(l normally rest two steps below the first group of terminals in the bank A, while it is necessary to raise the switch one step to bring the brushes 7) opposite the first group of terminals in the bank 13.

The brush set a mounted above the brush set 71 on a brush shaft (3, which shaft is supported for vertical and rotary movcmnt in a frame (not shown). A rotary ratchet T and a vertical ratchet S are provided on the brush shaft with which Specification of Letters Patent.

Patented June 241, 1919.

Serial No. 134,571.

pawls carried by th* armatures of the rotary n'iagnrt RM and the vertical magnet YM respectively engage to operate shaft (3. A collar 10 provided with a rod 9 is rota tably mounted near the bottom of the shaft (3 but is held against vertical movement on the shaft in any suitable manner. This rod 9. near its lower portion carries a heel 11 which functions in a manner to be described. A bell-erank leve 13 pivoted to the frame has at the end of one. of its arms. a rounded portion 12 which engages the heel 11 when the shaft 6 has been moved up one step. The engagement of the rounded portion 12 and heel 11 causes the elevation of the arm 1% of said lever. A rod 15 pivoted to the upper end of the armature of a magnet 5 normally rests on the arm 1a of the bellcrank lever 13.

A side switch 31 provided with a Contact arm and contacts of usual structure and arrangement. is actuated by a spring 32 to move in a counter-cloekwise direction under the control of an escapement 17. A rod 16 pivoted to the upper end of this escapement member 17, will be engaged by the rod 15 upon the energization of magnet 5 at all times after the second vertical step of the shaft 6. The side switch 31 will be advanced one position each time that the rod 16 is returned to its normal position by the action of the spring 33 after it has been actuated to the right by the rod 15.

A dash pot 20 mounted on the frame is provided with a plunger arm 19. This plunger arm 19 carries lugs 18 and 22 and insulated arms 25 and 2G, and terminates at its left end in transverse roller 21. W'hen the shaft (5 has been raised one step and the magnet 5 is energized, the rod 15 which now presses against the rod 18 will move the plunger arm 19 to the right. If the shaft 6 is now raised a second step, the rod 9 will engage the roller 21 to hold the pluiiger arm in its oif-normal position against the action of spring 24. until the switch is restored to normal. Ii. however, the magnet 5 is not,

energized after the shaft 6 has taken its first vertical step. the rod 9 after the second vertical step )vill engage the roller 21 in such a way as to hold the plunger arm 19 in normal position until the switch is restored. The rod 9 is held by guides (not shown) so as to travel vertically with the shaft 6 but not to rotate with said shaft.

cuit from magnet. 5 to contact springs t0 when arm 19 is in any position but normal. The arms 25 and 26 on the arm 19 engage the contact springs 27 and 28 when said arm is in normal position, and engage Contact. springs 29 and 30 when the arm 19 is moved to the right.

The vertical and rotary ratchets 7 and 8 are held by pawls 36 and 37, respectively,

which are pivoted on the frame. These pawls are spring-actuated and engage the ratchets whenever plunger arm of a dash pot 3+ is held in off-normal position. This dash pot 3+ is mounted on the frame and its arm 35 is normally held in engagement with the above mentioned pawls by spring 39. This arm 35 is moved to the left. by the energization of relay whose armature engages a lug on the arm. \Vhen in normal position. the plunger arm holds pawl 36 outof engagement with its ratchet and a lug 38 carried on the plunger arm holds pawl 37 inoperative. The dash pot 3% is adjusted so as to release its arm very slowly. A bell crank lever 46. pivotally mounted on the frame. engages with one arm the bot tom of the shaft (3 and with the other arm the contact arm of the side switch 31. \Vhcn the shaft 6 is returned to normal the lever 46 operates to restore the side switch.

Contactv springs 0 are normally open and will be closed only when the projection 11 forces rounded portion 12 against them. (ontact springs ll will close when the brush shaft 6 has taken two vertical steps and will remain closed thereafter until the switch is restored. I

I .\n impulse sender generally designated as 47 is provided with two sets of contact springs 1 and 52 which will be included in the controlling circuit otthc switch to be operated. This sender is provided with dials l8 and 49 with each of which characters are associated. The characters associated with the dial 48 may be numerals such as 1 to 0. and those associat d with the dial ltl may be letters. The dial 43 operates independently ot' dial it) to open and close the springs 1. The dial 4! is arranged to carry the dial 4% with it by means oi pin it when operated and thereby to operate the spring. 1 as though the dial 48 had been used. In addition to opt rating the springs 1. and before such operation occurs. the lingcr ot' the operator when using the dial 49 will engage a movable tingcr lcvcr at a sullicient period of time before engaging the stationary tingcr stop in order to cause a singlc opening ol the springs 2 tor a period considerably longer than that of an impulse through the springs 1.

t'urrcnt is normally supplied to the calling subscribers substation from battery through the windings of the retardation coil 42. but when the line -is in use the battery will be removed by the opening of otf-normal contact ON of the line switch indicated diagrammatically at LS and will be replaced by battery at relay 3.

Further details will be understood from the following description of the operation of the switch.

hen the subscriber removes his receiver from the hook at line switch LS will pick out an idle connector circuit. whereupon rclay 3 will be energized from battery. through its winding. lower wiper of LS. switchhook SH, contact springs 1 and :2. left-hand winding of 42. to ground. It the subscriber dc sires connection with a l to whose terminals are in the bank A he wil operate his sender using the numeral corresponding to the firstdigit of the number of the called line. and will thus cause a series of impulses to be sent out by the intermittent breaking of the previously described energizing circuit of the relay at the contact. spring 1. When the relay 3 was. first. energized it closed a circuit for energizing the slow release relay 4 from battery. armature and front contact of relay 3. winding of relay r, to ground.

The cnergization of the relay 4 caused the holding pawls to engage the vertical and rotary ratchets. Vlltll the subscrila'l dials. the armature of the relay 3 vibrates. and each time the relay 3 is det ncrgized a circuit is closed from battery. armature and back contact of relay 3. armatui and frontcontact of relay r. contact arm of side switch 31 (position 1). through the winding of the vertical magnet "M. to ground. This results in the elevation of the brush shaft (3 until brushes a are opposite the group of terminals in which the desired line terminatcs.

When the numerals on the dial are used. the first two impulses scnt through the springs I raise the brushes 11" to thc tirst group of line terminals. After the HtUlltl impulse the springs. -tl will he closed and the slow release magnet 5 will be energized from battery, armature and back contact of the relay 3, springs 41. through the winding of the magnet 5. to ground. and will he hcl'l up through the remainder of the series of impulses. 'hcn magnet 5 is energized rod 15 will push the rod 16 to the right so that. the side switch will step into its second position upon the release of ll'c magnet which occurs at the cud of thc lirst series of impulses.

The subscriber now dials again. sending out a second scrics of impulses over the circuit previously traced as ta as the side switch which is. arm in position '3. o that impulses are transmitted thcncc o er the wirc [5 to the rotary umgnct HM. During this series of impulses thc low magnct 5 will again be energized and at the end of the impulses will move the side switch 31 into its third, or idle position. Brushes a will now rest on the terminals of the desired line and will be connected to the calling substation through springs 27 and 28, insulated arms 25 and. 26, wires 43 and H, and the wipers of the line switch LS.

If, however, a subscriber desires conncction with a line having terminals in the bank B, he dials with the 'letters instead of the numerals forthe first series of impulses. The contact springs 2 will be opened, causing the retraction of the armature of the relay 3, which sends one impulse from battery, arn'iature and back contact of relay 3, armature and front contact of relay 4, side switch 31 (position 1) through the winding of the vertical magnet, to ground, to elevate shaft 6 one step. Immediately after the sending of this impulse the armature of the relay 1- will drop back, and an energizing circuit for magnet 5 will be closed from battery, armature and back contact of. the relay 3, armature and back contact of the relay 4-, contact springs 40, which are now closed since the shaft 6 has been elevated one step, rod 23, through the winding of the magnet 5 to ground.

The attraction of the armature of magnet 5 causes the rod 15 to engage lug 18, which it rests against, after the first vertical step of the brush shaft, thus -ausing the movement of the plunger arm 19 to the right. Contact springs 2 will now close, causing the energization of relay 3 and relay 4. The armature of relay 4 was not retracted for a sufficiently long time to allow plunger 35 to return to normal, which would have removed holding pawl 36 from the vertical ratchet and allowed the brush shaft 6 to drop back to normal. When the closure of the contact springs 2 resulted in the energization of the slow relay 4, the circuit for holding up magnet 5 was broken at the back contact of relay 4, and magnet 5 became deenergized. The plunger arm 19. however,

being held by the dash pot 20 did not have time to return to normal before the second step of the brush shaft caused the rod 9 to engage roller 21 and hold arm 19 in its right-hand position.

ln'n'nediately after the closure of the con tact springs 2 a series of impulses is sent out, which causes the armature of the relay 3 to vibrate, transmitting impulses over the circuit previously traced to the vertical magnet so that the brush shaft is lifted until the brushes 1) are opposite the group of terminals containing the desired line. At the conclusion of this series of impulses magnet .5 again becomes dci nergizcd. allowing the side switch to step into its second position. The subscriber now dials again with the result that the rotary magnet is intermittently energized until the brushes 6 rest on the terminals of the desired line, at which time the subscriber will be connected through line switch LS, wires t3 and 44, insulated arms 25 and 26, now in their right-hand position, springs 29 and 30, to the brushes 1).

At the end of the conversation, when the subscriber hangs up his receiver, he breaks at his switchhook SH the holding circuit of: relay 3, which retracts its armature. The consequent deenergization of the relay 4 is followed by the return of the plunger arm 35 to normal, which disengages the holding pawls 36 and 37 from their respective ratchcts and allows the brush shaft 6 to be rotated back ,to normal by the usual spring (not shown), and to fall into a normal position under the influence of gravity. "When it reaches bottom, the end of shaft (3, pressing on one arm of the bell crank lever 46, will cause the restoration of the side switch 31, and the apparatus is ready for the next call.

hat is claimed is:

1. In a telephone system, telephone lines, selective switches arranged to interconnect said lines, said switches being provided with a plurality of banks of fixed terminals and a set of brushes to travel over and make contact simultaneously with the terminals of each of said banks respectively, an impulse transmitter, means for connecting said impulse t ansmitter to any one of said switches, and means at each switch controlled by the first impulse transmitted thereto from said impulse transmitter for determining the particular set of brushes at said switch to be used.

In a telephone system, telephone lines, selective switches arranged tointerconnect said lines, said switches being provided with a plurality of banks of fixed terminals and a set of brushes to travel over and make contact with the terminals of each of said banks respectively, an impulse transmitter, means for connecting said impulse transmitter to any one of said switches, and means at each switch controlled by the character of the first impulse transmitted thereto from said impulse transmitter for determining which of said sets of brushes at said switch shall be used,

In a telephone system, an incoming line, a plurality of outgoing lines, an automatic switch arranged to select any one of said outgoing lines, means for connecting said incoming line to said switch, said switch being provided with a plurality of sets of brushes arranged to engage simultaneously contacts of said switch, an impulse transmitter associated with said incoming line and arranged to directively control said switch, and means directively controlled by first impulse transmitted from said impulse transmitter when associated with said switch for determining which of said sets of brushes shall be used.

4. In a telephone system, telephone lines, selective switches arranged to interconnect said lines an impulse transmitter, said switches being provided with a plurality of banks of fixed terminals and a set of brushes to tavel over and make contact with each of said banks of terminals,- respectively, said impulse transmitter being arranged to operate from a plurality of sets of positions to send the same train of impulses from corresponding positions in each set of positions, a circuit changing device included in said impulse transmitter arranged to be differently actuated in each of said sets of positions, and means controlled by 'said circuit changing device for causing one or another of said sets of brushes to be used.

In a telephone system, telephone lines,

selective switches arranged to interconnect said lines, an impulse transmitter, said switches being provided with two banks of fixed terminals and two sets of brushes arranged to travel over and make contact with the terminals of each of said banks, respectively, said impulse transmitter being arranged to be actuated from two sets of positions to send the same train of impulses from corresponding positions in each set of positions, a circuit changing device included in said impulse transmitter arranged to be actuated in one of said sets of positions only, and means controlled by said circuit changing device for causing one or the other of said sets of brushes to be used.

In witness whereof, I hereunto subscribe my name this 29th day of November, A. -D.

' FRANK A. LUNDQUI ST.

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