US738525A - Telegraphic transmitter. - Google Patents

Description

N o. 738,525. PATENTED SEPT. 8, i903.

I J. P. CONWAY.

l 'I'E1'.|EGR.APHIC TRANSMITTER. y APPLIoAToN FILED mmm 1 902.

UNITED STATES 'Patented September 8, 1903.

PATENT -Orrion TELEeRAPi-ilo TRANSMITTER.

SPECIFICATION forming partof- Letters PatenuNo. 738,525, dated September 8,\190`3. -Y Application filed August l5, 1902. Serial No. 119,814. (No model.)

Be it known that I, JOsEPH'P. CONWAY, a citizen of the -United States,residing at Los Angeles, in the county of Los Angeles and State of California, have invented new and useful Improvements in Telegraphic Trans-4 mitters,

Of Whichthe following is a specification. y f i t My invention relates to telegraphic transmitters for sendin g electric signals according to the Morse alphabet or any other predetermined electric signals; and the Objects thereof areto provide a machine of simple construction and operation with which a person skilled in type-writing can send a telegram in the Morse alphabet much more quickly than. thesame canbe sent by hand by the most skilful telegraph operator. I

accomplish these objects by the mechanism" described herein and illustrated in the accompanying drawings, in which- Figure l is a perspective view of my transmitteiwith a portion of the case removed for clearness of illustration. Fig. 2 is a detail of construction. of the depression-bar.

In the telegraph system now in use, especially when using the ordinary key in connection with the Morse sounder and sending I all signals entirely by hand, the operator is liable to make mistakes in the letter or word and to jumble the letters and Words together in an indistinct manner. Again, it is impossible to send with any great speed, as there is amaximum limit to sending by hand.

' According to my invention a keyboard of any standard type-writer is used, together with connecting mechanism, so that as the key representing a certain letter is depressed the Morse or other predetermined signal corresponding to that letter Or character will, be transmitted to the receiving-station. All the sending operator has to do is to' press these keys consecutively to spell the word and send the message, and he can send with as high a rapidity as it is possible to use .the ordinary typewriter, each word and letter thereof being sont at a uniform speed. Since the make and break of the contact is done automatically and at a uniform rate, the Work of the receiver will be much easier. p

In my machine, A is the case,which incluses Fig. 3 is an isometric view.

themetallic key-levers I3, which are provided vwith finger-buttons C, with characters there- On in the manner common to keyboards of' type-writers. These key-levers are pivotaliy mounted on metallic rods D, `which gitndinally the ease and transversely through partitions E, of' non -c'onducting' material, which extend transversely through the case, separating the rows Of keys from each other and providing suitable supports for'the rods and for the stop-,pins F. Wooden partitions I have found to be suitable. These rods are electrically connected by' the metallic strip G to the wire Hjof the telegraph-line. Rods L also run longitudinally the case and transtrically connected'together by the metallic strip I. These rods are -connected to the -verselythrough the partitions and are elecpositive pole of battery J by strips I and Y' wire M. The negative pole of the batteryl is electrically connected by Wire K with the ground. On rods 'L are rigidly secured the metallic1 contact-springs N. Thesesprings are supported near their junction with the rods by supporting-pins O, driven in the partitions.' On Vthe bottom of the key-levers are formed contact-points or electric characters P to electrically produce the different letters of the Morse alphabet or other predetermined electric signals, the fingerbutton on the topbeing the representative of the electric character on the bottom of the lever. These key-levers `are held normally out of engagement with the contact-springs by retractile springs R, which also return the keys to their normal position after the key is depressed by the' finger of the operator. Iivotally mounted on the same rods as the key-levers are depressing-bars Syeach of which has two arms S and S", which li'e in `the path of movement of the lower arm of the key-lever and are moved thereby, the extent of the movement being limited by the stop-pins F. key-lever bears against the 'arm S of the depression-bar and holds it spring-pressed against a stop-pin. In this position the keylever does hot engage with the contact-spring. When an operator desires to send a message, he strikes successively the iinger buttons which have the appropriate'characters thereon which spell out the message. As the top Normally the lower arm of the roo Vmakes and breaks the circuit.

arm is depressed the lower arm of the keylever is elevated and passes over the contactspring, the points thereof engaging therewith,

' and thereby making and'breaking the circuit in the same manner t-hat the Morse key The upward movement of the lower arm of the key-lever causesit to strikeua-gainst the arm S" of the depression-bar anti to carry it until its movement is arrested by the stop-pin F in its path.

` This movement of the depression-bar brings the central arm S" into a position where it rests upon and holds contact-spring` N devpressed far-.enough that.' on the downward -movement of the lower arm of the key-lever the contact-points thereof will not engage `therewith. As soon as the operator releases the pressure on the upper arm of the key-le 'ver the retraction-spring returns the lever to its normal position. In returning to its norm'al position the lower arm of the key-lel fthe lower arm of the key-laver whenever itisj again moved upward. The depression-bar is made of-any suitable non-conducting material. I have found fiber very satisfactory. It will be seen that by the use of mymachine all vsignals will be uniformly correct and even and that the speed with whichv a message can be sent is only limited by the speed with which an operator can operate the v keys and that any person who can operate a type-writer can operate the ir achine and send telegraphic messages.

Having described vmy invention, what I claim as new, and desire to secure by Letters' Patent, is-

1. In a telegraphic transmitter, -a casing; a

Y plurality of centrally-pivotedl metallic levers mounted in said casing and electrically connected together, said levers having fingerbuttons on the upper arms and contact-points 4 on the lower arms thereof; said finger-buttons being provided with known characters on the top thereof, and said contact-points.

on the lower armbeing the telegraphic representative of the top characters; a plurality of contact-springs electrically connected together and to the positive pole of a battery,

the free ends of which said springs .bcingl adapted to lie in the path of movementofthe said contact-points of the said key-levers; insulating 'pivoted depression bars having arms on either side of the lower arm of said key-levers and lying in the path thereof and adapted to be moved therebyI and a central arm adapted to be` moved to depress the contact-springs on the upward movement of the lower arm of said key-levers and to hold the same depressed' until the passagethereover of said contact-points of said key-lever on the downward movement of the lower arm thereof and then to'be removed thereby'from said contact-spring; a battery having the negative pole thereof electrically grounded.

v- 2. In a-telegraphic transmitter, a casing; a plurality otpivoted key-levers mounted in said casing and electrically' connected together, said levers having finger-buttons providedwith known characters on theupper arm and contact-points on the lower arm, said contact-points being the electrical representatives of the top characters; contact-springs electrically connected together having the tops thereof in tre path-of movement of the said contactpoints-of saidA key-levers,said springs and levers being normally insulated from each other and adapted to contact on the upward movement of the lower arm of the y said contact-lever; and means to move and retain the said contact-spring out of the path of the said contact-points of said key-lever lon the downward movement of the lower arm thereof. l

3. In a telegraph transmitter, a casing; a contact-spring; a pivoted key-lever having contact points on the lower end thereof adapted to engage said contact-spring on the upward movement ot' the lower end of said key-lever; an insulating depression-bar having arms adapted to lieon both sides of and be moved upward and downward by said keylever, a central arm `adapted to be moved by said key-lever to remove and hold said conl tact-spring out of engagement with the contact-pointsof said key-lever on the downward movement of the lower end thereof.

In witness thatIclaim the foregoing-:I have hereunto subscribed my name this 4th day of August, 1002.

JOS. l. CONWAY.

lVitnesses: G. E. HARPHAM,

M. C. NICKELESON.

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