US1040635A - Telephony. - Google Patents

Description

' 0. A. BALS.

TELEPHONY.

APPLICATION TILED MAY 22,1011.

Patented 0t.8,1912.

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G. A. BALS.

TELEPHONY.

APPLICATION FILED MAY 22,1911.

1,040,635. Patented 0ct.8,1912.

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STAS ATENT OFFICD CHARLES A. BALS, OF CHICAGO, ILLINOIS, ASSIGNOR T0 CORW'IN TELEPHONE MANUFACTURING COMPANY, A CORPORATION OF ILLINOIS.

TELEPHONY.

Specification of Letters Patent.

PatcntedOct.8,1912.

Application filed May 22, 1911. Serial No. 628,749.

To all whom it may concern:

Be it known that 1, CHARLES A. Bans, citizen of the United States residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Telephony, of which the following is a full, clear concise, and exact description, reference being had to the accompanying drznvings, forming a part of this specification,

My invention relates to that class of telephone exchange systems in which telephone lines are automatically extended at the ex change and my invention broadly contour plates such a telephone exchange system whether the extensions terminate at called telephone stations or are more links between calling and called telephone lines.

My invention relates particularly to the switching mechanism that is employed at the telephone stations for operating theselecting mechanism at the exchange for automatically extending telephone lines.

My invention has for its object the provision of a construction whereby the operating portion of the switcl'iing mechanism may be formed in an individual unit, said unit being separably associated with the cir cuit that it to control. The (merating unit of the switching mechanism is provided with terminals for separably including the switching niechanisn'i in the circuit that it is to control, these terminals having cow tacts that are mouutml imliuieudently ot' the aforesaid terminals whereby the switching mechanism including these latter terminals may be removed without disturbing the connections of the circuit conductors leading to said contacts.

In the preferred en'il'iodiment ol' the invention the terminals arc'in the form of leaf springs which are carried by the Li'ramcwork that supports the switching mechanism. The contacts are desirably in the Form of screws against which the spring terminals are pressed when the switching mechanism is put in position, these contacts being mounted upon a framework or casing upon which the switching mechanism is removably secured.

I will explain my invention more fully by reference to the accompanying drawings showing the preferred einbodin'ient thereof as employed in connection with a subscribcrs desk stand that enters into a common In the drawings Figure 1 is a side clevation of a desk stand equipped in accordance with the preferred embodiment of the invention; Fig. 2 is a front elevation of the structure shown in Fig. 1; Fig. 3 is a view in elevation showing the apparatus of my invention, the lower portion of the desk stand casing, framework, or mounting that carries this apparatus being shown in sec: tion; Fig. i is a bottom view of the structure shown in Fig. 3: Fig. is a diagrammatic view showing the circuit connections that are effected by the equipment il1ustrated in the other figures.

Like parts are indicated by similar characters oi reference throughout all of the views.

The side 1 of a telephone line is connected with a contact screw that is carried upon a mounting plate 3, this mounting plate bcl'ng desirably rcmovably secured to a main mounting 4 that, in the embodiment. of the invention illustrated, is cimstituted of the base ot' the desk stand. There is an inner basclike structure 5 that is removably secured to the desk stand by an upward extension 6 screwed to the cylindrical portion 7 of the desk stand by fastening screws 8, though other means may be employed for uniting the inner base 5 with the stem 7 of the desk stand and with the main mounting 1 through the intermcdiaiion of said stem. The mounting plate 3 is rcmovably secured to the element 5 by means oi spring clips 8. The other side S) of the tclcplume line is diagranunatically illustrated in liig. 5 as being connector l with the telephone receiver switch book 10, the normal contact of this switch hook constituting one terminal of the bridge coudu .:tor whose other terminal is permanently connected with the side 1 -o[ the line and which bridge conductor includes a signal receiver 11 and a condenser 12. The alternate contact 13 ot' the switch hook is connected with a screw contact 1 1 similar in mechanical construction to the screw contact 2 and similarly mounted upon the mounting plate 53. The alternate contact 15 of the switch hook is connected thrtmgli the telephone receiver 10 and the telephone transmitter 17 with a contact screw 18 simi-' lar in mechanical construction to the contacts t2 and 14 and similarly mounted in lie the mounting plate 3.

Theswitching mechanismior modifying the line circuit in order to set the selecting mechanism at the exchange into operation includes spring contacts 19, 20, and 21 that are adapted for engagement with the screw contacts 2, 14 and 18 respectively. The

spring contact 19 is connected with a CiI' cuit opening. and closingspring 22 provided with; a contact 23 that itnormally engages and ,which contact 23 is connected with the spring contact 21.

mechanism which is employed at the substation for operating the selecting mechanism is idle, circuit between the line sides 1 and 9' is completed throughthe telephone receiver 16, when this receiver is removed from its switch hook, by way of a bridge connection which may be traced from the side 1 through the screw contact 2, the spring contact 19, tli e' circuit opening and closing contacts 22 and 23, the spring contact 21,

the screw contact 18, the transmitter 17, the 251 receiver 16, thmterminal contact of the, receiver that is then engaged with the switch hook 10, said switch hook'lO to the side 9. When the selecting mechanism is to be operated, thebridge conductor between the sides of the telephone line is interrupted at 22, 23, it being usual to shunt out the receiver and transmitter when circuit interruption occurs at 22 23 to avoid objectionable noise in the telephone receiver 16.. This result is accomplished by providing the additional elements 13, 14 and which have been described and also the normally open shunt switch contacts 24 and 25, these latter contacts being-closed during the circuit interrupting operation by mechanism which 18 well understood, the shunt about the receiver and transmitter then established being traceable fromthe contact 21, through the contacts 24' and 25 that are engaged during the dialingoperation. the contacts 14 an]. 20, the contact 13 to the switch hook 10. The element which is employed for bringing contacts 24 and 25' together is diagrammatically illustrated at 26 but inasmuch as the mechanism by which this element 26 is operated is so well known I will not describe its operation. The mechanism that interrupts the bridge conductor at 22 and 23 includes a cam 2'? that engages the contact,23 to move it from its companion 22 to cpeh the bridge conductor and to permit thecontact 23, by its own resilience, to move toward the contact 22 to engage 1t and thereby c'lose the bridge conductor. This cam is operated by means of dial mechanism 28 which is so very well understood as to render a description thereof superfluous. The dial mechan ism" 28, the com 2?, the spring contacts 19,20 and 21, the bridge making andbreaking contacts 22 and 23, the telephore When that switching.

noaaesa receiver and transmitter shunting contacts 24 and 25, and the element 26 that establishes the shunt connection at 24 and 25 when dialing is taking place areall provided upon a framework or mounting that includesa bottom plate 29, a top plate 30 and posts or struts 31 thatlconstitute distance preserving devices for, maintaining the plates 29 and 30 in proper relation. These posts 31 also 1 serve as anchorage 'means whereby the base 4 and the mounting for the parts 19' to 26 inclusive which have just been'described may be separably secured 'together. I prefer separably 'to secure the base 4 and the mounting for the parts 19 to 26 inclusive in position by means of screws 32 that pass through the cylindric 1 projection 33 of the base 4 andinto the po tsBl.

The line sides 1 and 9 of the telephone line may be associated with the contacts 2,

14 and 18 in a way that is mechanically in-= dependent of the wiring that associates the part-s19 to 25 inclusive, these latter parts being electrically associated and mechanically supported by amounting that is structurall'y distinct from the mounting 4 that carries the contacts 2, 14 and 18, these two mountings being separably united in a manner to permit of the proper electrical asso ciation of the contacts carried thereby when the.equipment is assembled.

The switching mechanism that is carried by the mounting structure that is mainly imposed of the parts 29, 30 and 31 is, in

the embodiment of the invention illustrated, controlled by the dial mechanism that so commonly enters into the equipment that is carried by separably engaged mountings; the

switchingmechanism being carried by one of said mountings; and a mounting plate for the contact carried by the other mounting separably secured to said other mounting a contact carried by the-mountingplate hav- .ing a lme conductor connected therewith which is bodily movable with the contact and the-mounting plate for the contact.

2. Apparatus for automatically eifect-ing extension of telephone lines which includes switching mechanismfor governing the circuitoi": the selecting mechanism. that is to effect the line extension; engaging contacts for establishing the circuit relation ,of said switching mechanism and one of which is a spring contact, these contacts being carried by separably engaged m0untings,- the switching mechanism being carried by one of said mountings; and a mounting plate for the contact carried by the other mounting separably secured to said other mounting a con- 10 tact carried bythe mounting plate having a my name this sixteenth day of May A. D., 15

CHARLES A. BALS. Witnesses G, L. Came, E. L. WHITE.

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