US1038605A - Composite system. - Google Patents

Description

0. T. LADEMAN.

COMPOSITE SY$TEM.

APPLICATION FILED 11:12.15, 1909.

1,038,605, Patented Sept. 17, 1912.

ll fnawrw Z6 0ZZ0ZZZ Zan w; a 7% I Q? COLUMBIA PLANOORAPH (10., WASHINGTON. D. C

UNITED srArEs PATENT orruon.

OTTO T. LADEMAN, OF MILWAUKEE, WISCONSIN, ASSIGNOR T0 RAILWAY TELEPHONE & ELECTRIC COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

COMPOSITE SYSTEM.

Specification of Letters Patent.

Patented Sept. 1'7, 1912.

Application filed February 15, 1909. Serial No. 478,073.

To all whom it may concern:

Be it known that I, O'r'ro T. LADEMAN, citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Visconsin, have invented a certain new and useful Improvement in Composite Systems, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to composite telephone and telegraph systems, and is more particularly directed to improvements in the telephonic devices associated with such circuits. I provide for my invention an improved arrangement of the telephonic devices in association with telegraphic devices on a circuit of this character, which, in the form shown, include among other advan tages condensers of different capacity around the different telegraphic devices; likewise, improved means for receiving a local signal at the telephone, as well as improved means for receiving the voice currents, and eliminating and cutting down to a large extent telegraphic noises. 7

My invention further contemplates improved circuit arrangements of the signal sending circuit at the telephone, so that the telegraphic currents will not be at any time in danger of interruption by circuit breaks in the telephonic instruments.

My invention further contemplates a direct serial inclusion of various telephonic sub-station apparatus in the telegraphic circuit, all of which, will more clearly appear hereafter, from the construction and arrangement which I will now describe, in connection with the accompanying drawing, in which,

Figure 1 illustrates my improved line circuit; Fig. 2, a detail of the telephonic'ine struments associated with said circuit.

Referring more particularly to Fig.1, I

with short 'circuiting switches 5, 5. The line wire is grounded at 6, 6, at its extremities through the interposition of battery 7, 7, as required. Impedance coils88 are included at the extremities of the line wire, immediately beyond where the telephone circuit is designed to come to an end on said wire 1. To carry the voice currents back over the ground or return circuit, condensers 9, 9, are included in the ground c011- tact as shown. These coils modify the abrupt changes of the telegraphic current. when closing the key, and cause a rounded wave, and the condensers 9 are enabled to take the discharge. Thus, in dealing with telegraphic currents in this system, the constants of the devices 8 and 9 are so chosen that we may regard thesetclegraphic currents as having a wave form, and their fre quency thus comparable to the number of makes and breaks within ordinary'limits. It is of importance that telephonic currents be not deflected or impaired by the relays 3, yet it is unwise to have high-capacity condensers bridged around the keys 4, onaccount of excessive sparking. After experimentation, I have found that I can place condensers 1010 of low capacity around the key contacts with good results, and em ploy condensers 11, 11, of high capacity, around the telegraphic relays 3. I find that this is a great step in advancing the talking qualities of a circuit of this character. and transmission is little, if any, impaired by the telegraphic devices.

The telephonic instrument, which is shown more in detail in Fig. 2, is connected to-the line wire 1, by means of the switch 12. This telephonic instrument consists of a receiver 13, arranged in a secondary winding l t, in association with a primary winding 15', which primary and secondary. wind- 7 ings together have an adjustable core 1.6,

or other suitable means of varying their mutual inductive effects, thus to eliminate to as great an extent as necessary telegraphic impulses which might find their way to the receiver 13. The windings 14L and '15, to; gether with the core 16, form a repeating coil, as will be apparent.

The incoming receiver circuit, after pass- 1ng through the winding 15, passes through the conductor 16, the short circuiting spring contacts are not broken until the lower contacts are made, and vice versa, all as is well v understood in the art.

In transmitting, the switch handle 21 is thrown over to its alternate position, which breaks the contact "of the spring 17, and makes contact between the spring 22 and the spring 23, whereby the short circuit around .the secondary winding of the induction coil is opened, and the transmitter circuit is closed; Thus, when talking into the telephone through the transmitter 25, there are included in circuit with said transmitter, the battery 26, the primary 27 of the induction coil, the switch hook 19, and the conductor 28. Voice currents are then transmitted through the secondary winding 24 serially over the line circuit 1, the switch-hook being in the position shown. It will be apparent from this that the local transmitter circuit and the secondary winding of the induction coil are eliminated from the talking circuit when receiving communi cations by means of the receiver 13. The local signal-recelving circuit contemplates a low wound howler arrangement 29, in association with secondary winding 30, which is inductively related with a primary winding 31. This primary winding 31 makes connection to the lower contact 32 of the switch hook, and when the switch-hook is down, brings this winding 31 into serial arrangement with the line wire 1. Telegraphic currents passing through the coil 31 do not aiiect the signal receiving device 29, on account of the inductive arrangement, as shown. V

The signal sendingcircuit at the telephone consists of the local circuit comprising the battery 32, a primary winding 33 having an armature 34, with a back contact,

37 to start the primary circuit, and atthe same time opens a short circuit around the winding 38, and releases the spring 20 of its back contact. The winding 38, therefore, is

in serial arrangement with the line wires 1 when signaling, and the signal can be traced from the line wire 1 to the spring 20, the winding 38, the switch-hook 19, contact 32, winding 31, back to the line wire 1. It will be noted from this that when the button 39 is in the position shown, as when no signals are being sent, the receiver being upon its switch-hook, telegraphic currents from the line'wire 1 can pass through the coil 31, contact 32, switch-hook 19, directly to the spring 20, and back onto the line wire 1. Now, during the signaling, however, the button "39 is pressed inwardly, and the spring 20-broken away from its back contact, and telegraphic currents can still fiow through-the instruments, and their circuit istraced from the'line wire 1 through the winding 31, switch-hook 19, winding 38,

back to the line wire 1. It will be seen from this that allot the operations incident to the use of thetelephone can be carried on without affecting the telegraphic circuit.

While I have herein shown andparticularly described the preferred embodiment of my invention, I do not wish to limit myself to the precise construction and arrangement as herein set forth, but" Having thus set forth its most salient features, what I claim as new and desire to secure by Letters Patent is 1. A composite system of telegraphy and telephony comprising a line circuit, telephone instruments associated with said cir-' cuit for impressing voice currents thereon, telegraph keys serially associated with said circuit, low capacity condensers bridged eX- clusively around said keys, telegraph relays also serially associated with said circuit, and high capacity condensers bridged exclusively around said relays.

2. A composite system ot-telegraphy and telephony comprising a line circuit, telephone instruments serially associated with said circuit for impressing voice currents thereon, telegraph keys serially associated with said circuit, low capacity condensers bridged exclusively around said keys, telegraph relays also serially associated with said circuit, and high capacity condensers bridged exclusively around said relays.

'3. A composite system of telegraphy' and telephony comprising a line circuit, tele graph instruments associated with said circuit, telephone instruments also associated with said circuit, a telephone receiver included with each telephone, a signaling-cu cuit for each telephone adapted when in circuit-to permit the passage therethrough of telegraphic currents, and a local signal inductively associated with said signaling circuit, unresponsive to telegraph currents.

LA composite? systemof telephony and telegraphy comprising a line circuit, telegraph instruments serially arranged on said line circuit, and telephone instruments also I In Witness whereof, I hereunto subscribe associated with said llne clrcult, each havmy name this 19th day of January A. 1).,

ing a transmitter and induction coil, the 1909. secondary of said induction coil being se- OTTO T. LADEMAN. rially included in the line circuit When Witnesses:

transmitting messages, and being short-circulted when recelvlng messages.

MAX NV. ZABEL, O. M. NERMIOL. L

Copies of this patent may be obtained for five cents each, by addressing the Gommissioner of Patents, Washington, D. C.

Images