US1348780A

US1348780A - Telephone system

Info

Publication number: US1348780A
Application number: US159440A
Authority: US
Inventors: Bryant D Campbell
Original assignee: Individual
Current assignee: Individual
Priority date: 1917-04-03
Filing date: 1917-04-03
Publication date: 1920-08-03
Anticipated expiration: 1937-08-03

Description

B. D. CAMPBELL. T E'LEPHONE SYSTEM. APPLICATION FILED APR. 3. 19!].

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TELEPHONE SYSTEM.

APPLICATION FILED APR. 3. 1917.

Patented Aug-4), 1920.

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B. D. CAMPBELL, TELEPHONE SYSTEM. APPLICATION FILED APR-3, um.

Patented Aug. \3, 1920.

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UNETED STATES PATENTOFFICE.

BRYANT D. CAMPBELL, OF OAKLAND, CALIFORNIA.

TELEPILIOINE sYsrrEiiI.

To all whom it may concern:

Be it known that I, BRYANT D. CAMPBELL, citizen of the United States, residing at Oak land, in the county of Alameda and State of California, have invented certain new and useful Improvements in Telephone Systems, of whichthe following is a specification.

This invention is a central-controlled pay. telephone system- The invention comprises a central telephone system equipped with a coin mechanism, controlled by central, for collecting and registering each coin which is paid by a calling party when central establishes thev connection between the calling party. and called party, and for returning the coin to the calling party when central fails to establish such connection.

The invention is particularly adapted to be embodied in the standard \Vestern Electric Co. Code 293A telephone. i

The invention is illustrated in the accompanying drawings which form part of this specification and the appended claims.

Referring to the. drawing:

Figure l is a diagram of a portion of a telephone system'embodying my invention shown in normal condition.

Fig. 2 is a diagram of the invention with the receiver of the calling telephone off the hook and connection established between said telephone and central.

Fig. 3 is a diagram showing the coin mechanism operated by central to receivethe coin of the calling party; the transmitter of the calling telephone shorted out by central and the receiver of the calling telephone Stllllll conn ction with central.

Fig. A is a diagram showing the coin mechanism of the calling telephone restored .to normal condition by the calling party after the coin of the calling party has been collected and registered by said mechanism; and the transmitter and receiver of the calling telephone connected by central for speaking with the called party.

Fig. 5 is a diagram showing the coin mech anism actuated by central for returning a deposited coin to the calling party when cen-. tral fails to connect the calling party with the called party.

Fig. 6 is a rear elevation of the coin mechanism of oneof the telephone stations in the system, the casing of said mechanism being shown in section. p

Fig. 7 is an elevation of the coin mecha- Specification of Letters Patent.

Patented A11 3, 1920.

Application filed April 3, 1917. Serial NOI159A40.

nism with certain parts removed and the casing shown in section, showing the interior operating parts of the mechanism.

Fig. 8 is a plan view of the coin mecha: nism, the casing being shown in dotted lines.

Fig. 9 is a front elevation of the coin mechanism with the casing shown in section.

10 is a sectional view of the coin mech anism taken on line l010 of Fig. 7.

Ptefe' ring to Figs. 1- to 4 inclusive, A indicates a portion of the circuit of a central controlled telephone system embodying my invention in which are included a telephone B and my coin collecting and registering mechanism C. The telephone B may, as shown, be the standard lVestern Electric Co. Code 293A telephone but the invention is applicable to other telephones.

lrlycoin collecting and registering mechanism may be described as follows:

Numera 1 indicates-a frame upon which the parts-10f the mechanism are mounted. lVithin said frame islocated a coin chute 2, extendin downwardly from the top of the frame. bracl-ret 8 extends outwardly from one side wall of the chute, in which a coin arresting lever is pivoted at 5. A pin 6 extends inwardly from said lever and is adapted to be projected through an aperture 7 in the side wall of the chutein thev path of thecoin, as will be described hereinafter. A spring 8 is' adjustably clamped at its upper end on a threaded pin 9, extending from the frame, between two thumb nuts 10 and 11, the lower end of which spring en gages the coin arresting lever at one side of lts QlYOi) and normally mamtalns the lever in position with the pin 6 withdrawn from the chute 2 in the path of the coin which pin is adapted to arrest the coin in the chute adjacent an opening 15 in wall 16 of said chute as shown in dotted lines in Fig. 7. p

A coin-actuating lever 20 is pivoted at 21 to the frame 1 at one side of the chute and has a pair of pins 22 projecting from its lower end through slots 23 in the side wall 2st of the chute. A spring 25 secured at 26 to the frame 1 en ages the lower portion of the lever 20 and normally maintains said lever in position with the pins 22 at the ends of the slots23 at the side of thechute, p

per end of chute 2 through which a coin may beintroduced into the upper end of said chutefThe' opening 15 of chute 2 leads into the upper end of achute 37, the lower end of which opens into a coin drawer 38 in the bottom of the casing l.

A coin-actuated register lever 40 is pivoted at-41 with its forward arm extending 1 to the opening 15 of chute 2 and resting directly above the upper end of chute 37. To the rear arm of said lever is connected the upper'end of link 42, the lower end of which is connected to the operating arm 43 of a 7 coin register 45.

" the frame 1, 'engages'the upper side of the ter operating arm and mechanism in their lever 40 and holds said lever and the regis-' initial position to be operated'by the coin as will be hereinafter described. A pin 48 extends from lever 40 through a slot 49 ina sidewall of the frame 1. The chute 2 is provided with a side opening 156 at its lower end which communicates with an out- .let15'7 in; the side wall of the casing which outlet opens into a coin delivery receptacle 160, and the bottom wall 161 of the 4 chute inclines downwardlyto said receptacle and outlet into the delivery receptacle as complishing these results will now be de so as toallow acoin released from the pin 6' to roll out'of the chute through said opening will be hereinafter described.

lrleansare provided whereby central may- -kill."thetransmitter T of the calling telephone'B, and keep it dead when the con nection' between the-calling and the-called parties made, until thecalling party drops a com into and operates the com mechanism and registers and delivers the coin into the coin collecting receptacle, which means also includes means to release and return the com to the calling party when central cannot make the connection. The means for ac-' scribed.

A magnetic switch generally indicated 50 is mounted on the frame l'of the coin mechanism. Said switch comprises a pair of spring contact arms 51 and apair of spring contact arms 52, a switch actuating lever 5'3 pivoted at 54and two

magnets

55 and 56.

The lever53 isso pivoted that one of its arms'57 'restsabove the contact arms 51 and its other arm 58 rests under the-contact arms 52. The arm 58 is heavier than the arm 57 and normally overbalances said arm and.

restsupon a pin 58 on the-frame 1, whereby A spring 46 secured'to the'lever is: maintained in horizontal inoperative position with the

arms

57 and 58 out of engagement with

contact arms

51 and 52. The

magnets

55 and 56 are located respectively

adjacent arms

57 and 58. Said magnets are wound in series with each other,

but in opposite directions so that a positive current in magnet 55 will attract the lever arm 57 while a positive current in magnet 56 will attract lever arm 58. The magnet 55 is connected by lead59 at terminal 60 to main 61 while the magnet56 is connected by lead 62 to a spring contact arm 63 which visadapted'to contact with spring contact arm 64 which is connectedby lead 65 and grounded at66. A lead 67 connects transmitter lead 68 to the inner. contact arm 51 and a lead 69 connects the otherfltransmitter lead 7 0 to the outer contact arm '51. Leads 71 and '72 respectively connect magnet 12 with lead 59 and the inner contact 52. A

lead 73 connects outer contact 52 and lead 62. A battery 80' is connectedat its positive pole by lead 81 to'main 61 and has its negative pole grounded at82. A'switch 83 is connected in series with lead '81 and is adapted tocontrol the current from the battery 80. A battery 90 is connected at its negative pole by lead'91 to main 61 and has its positive pole grounded at 92. j A switch 93 is connected in series with lead 91 and is adapted to control the current from the battery 90. The

switches

83 and 93 are an ranged in'the central ofiice within convenient reach of the central operator. The transmitter lead 681s connected to receiver spring contact arm 95. A spring'contact arm 96 is located: adjacent arm 95 and a spring contact arm 97 is located adjacent contact arm '96. The arm '95 has a finger 98 which extends into the plane of contact arm 64. The arm'95'has afinger99'and the receiver hook 101' hasfa cam 101 adapted when thereceiverR is'on the'hook to engage said finger and hold the contact arm 95:ou t of contact with contact arm 96,-and the finger 98 out of engagement with contact arm 64, and so asto allow the contact 96 to springout of contact with contact arm 97 and'the contact arm 64'to spring out of contact with contact arm 63. Contact arm 96 is connected by leads 1 02 and 103 to one the other end of said primary being connected bylead 106 at terminal 107 to main 110. The contact arm 97 is-connected by lead 111 to one terminal of receiver R, the other terminal of which is connectedby lead 112 to one end of secondary 1130f induction coil105, the other" end of said secondary being connected by leads 114 and 115 i end of the primary 104 of induction coil 105,

through bell 116 to terminal 1070f main 110. p

The operation of my invention is as follows:

The calling party takes the receiver R olf I the hook 101, and the hook swinging upwardly causes the cam 101 to remove its pressure from finger 99 which allows arm 95 to spring into contact with contact arm 96 and cause contact arm 96 to contactwith contact arm 97, and causes finger 98 to engage contact arm 64 and press said contact into contact with contact arm 63. A circuit is then established from central through main 61, lead 70 through transmitter T,'lead 68, contact

arms

95 and 96, leads 102 and 103, primary 104, lead 106, main 110 back to central. aid circuit is extended from contact arm 96 through contact 97, lead 111, receiver R, lead 112, secondary 113, leads 114 and 115 and main 110 back to central. The calling party and central then communicate through the transmitter and receiver circuit, the calling party calling the number of the telephone of the party to be called. This condition is illustrated in Fig. 2. Central then closes switch 83 and a current is sent from battery 80, through lead 81, main 61, leads 59, coils 55 and 56, lead 62,

contacts

63 and 64, lead 65 to ground 66 back to battery 80 through ground 82, whereby a positive magnetic field is established in magnet 55 and a negative magnetic field established in magnet 56 and the magnet 55 attracts lever arm 57 and causes said arm and arm 58, respectively, to engage and

close contacts

51 and 52; whereupon transmitter T is shorted out through lead 67, contacts 51 and lead 69, and a circuit is established from lead 59 through lead 71, through magnet 12 and lead 72, contacts 52, lead 73 to lead 62 and the lever 4 is swung by magnet 12 and pin 6 projected into coin chute 2 of the coin mechanism. This condition is shown in Fig. 3. When central connects called party with calling party and calling party hears called party speak, the calling party then drops the proper coin 100 through slot 36 into the chute 2 and the coin is arrested in the chute by pin 6. The calling party then places his finger on hook 30 and depresses the same, whereupon the lever 20 swings on its pivot and the pins 22 engage the edge of the coin 100 and force it through chute slot 15 between the lower end 140 of said slot and the forward arm of coin register lever 41, and the coin raises said register lever until it passes into chute 37 through which it drops into and is collected by the coin drawer 38, during which operation of the lever 40 by the coin, the register 45 is operated through link 42 and arm 43 and the coin is registered by the register, and at the same time the pin 48 engages and swings switch arm 58 down and switch arm 57 up, taking pressure off

contacts

51 and 52 and breaking transmitter short circuit and coin chute pin circuit. The transmitter T is now brought back into the circuit so that the calling party may talk to the called party, and the pin 6 is withdrawn from the chute 2 by the spring 8 swinging the pin end of lever 4 outward. The calling and called par-. ties now talk to each other. This condition is shown in Fig. 4. The parties upon completing their conversation hang up their receivers and the system is thereby brought back to normal inoperative condition as shown in Fig. 1. 1 I

In case the called party fails to answer, the operator momentarilyv closes switch 93, whereupon a reverse current is established from battery 90, through lead 91, main 61, lead 59,

magnets

55 and 56, lead 62,

contacts

63 and 64, lead 65 to ground 66 back through ground 92 to battery 90, and a field is established in magnet 56. The lever arm 58 is then attracted by magnet 56 and the lever 53 swung so that the

arms

57 and 58 disengage the

contact arms

51 and 52 and break the transmitter short circuit and the circuit including magnet 12. The system is then returned to normal condition as shown in Fig. 1.

In case the calling party should drop his coin in the chute when the called party does 'not answer, the breaking of the circuit including magnet 12 by the operation of switch 93 by central allowing the spring 8 to operate lever 4 and withdraw pin 6 from the coin chute would release the coin and it would drop into the receptacle 60 where the calling party could take it.

Normally the pin 6 rests outside the chute so that if a coin is dropped into the chute it will roll out into the receptacle 60.

I claim:

1. In a central controlled pay telephone, a coin mechanism, means whereby the transmitter of the calling party is made inoperative until the calling and called parties are connected, and the coin mechanism set to receive the coin of the calling party, and means whereby the coin mechanism may be actuated by the calling party to collect and register his coin when the calling and called parties are connected.

2. In a pay telephone system, a coin mechanism, means for preventing the calling party from utilizing the telephone to speak to the called party until the calling party has deposited the right coin in the coin mechanism, and means whereby the calling party may actuate said coin mechanism to register and collect the right coin which said party drops into said coin mechanism.

3. In a telephone system, a coin mechanism, means whereby central may prevent the calling party from utilizing the telephone to speak to the called party until the calling party has deposited the right coin in the coin mechanism, means whereby the coin may be collected and registered when cen tral has connected the calling party and called party, and means whereby the calling party may actuate said coin mechanism to register and collectthe right coin which said party drops into said coin mechanism.

4. In a' pay telephone system, a coin mechanism, means'for preventing the calling party from utilizing the telephone to speak to the called party until the calling party has deposited thewright coin in the coin mechanism, and means whereby the calling party may actuate said coin mech'anismto reglster andv collectfthe right'coln which sald party drops into said coin niechanlsm,

' and means operated by the coin mechanism when the coin is collected and registered whereby the calling and called parties are connected. r

,5. In 7 a pay telephone system, a coin mechanism, means for preventing the calling' party from utilizing the telephone to speakto the called party until the calling party has deposited-the right coin in said coin mechanism, means whereby the calling party may actuate said coin mechanism to register and collect the right coin which the calling'party depositsin said coin mechanism, and 'means'to enable the calling party to utilize the telephonewhen the coin is collected- In testimony whereof I my signature.

BRYANT D. CAMPBELL.