US1437237A - Telegraphic signal transmitter - Google Patents

Description

w. GLASER.

. TELEGRAPHIC SIGNAL TRANSMITTER.

APPLICATION FILED JAN- 13.1922.

Patgantd Nov. 2 ,192.

Patented Nov. 28, 1922.

UNITED STATES PATENT orrrcs.

WILLIAM GLASER, OF CHICAGO, ILLINOIS, ASSIGNOR T0 ALBERT G. MoCALE-B, OF

CHICAGO, rumors.

TELEGRAPHIC sreuar. rasnsnrr'rna.

Application filed January 13, 1922. Serial No. 528,942.

To alt whom it may concern:

Be it known that I, VILLIAM GLAsnn, a

I citizen of the United States, and resident mitters, 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 a device suitable for use by telegraphers. Generally stated, it is the object of my invention to provide a device that will eliminate certain serious shortcomings of telegraphic signal transmitting devices now in general use.

The majority of telegraphictransmitting devices now in use comprise two sets of contacts, one set of contacts being manually operated to effect the transmission of current impulses corresponding to dashes, the other set of contacts being operated by a vibrator, which is set in operation by the operator when he wishes to transmit current impulses corresponding to dots.

My invention is particularly concerned with certain improvements applicable to devices of this general type.

In the accompanying drawings illustrating my invention,

Figure 1 is a top plan view ofa telegraphic signal transmitter embodying my invention;

Figure 2 is a transverse section which may be regarded as taken on the line 22 of Figure 1, and looking in the direction indicated by the arrows;

Figure 3 is a detail elevationtaken on the line 3-3 of Figure l, and looking in the direction indicated by the arrows; and

Figure 4; is a circuit diagram.

Referring now to Figures 1 and 2, reference numeral 10 indicates a metal base plate which, if desired, may be provided with legs or buttons 1O 1() of insulating material. The base plate 10 carries two binding posts 11 and 12, which may be of any suitable construction. The binding post 11 is preferably insulated from'the base plate 10,and the binding post 12 is preferably in electrical contact'.withthe base plate; The binding post 11 is connected by a jumper 13 with the lower end of a conducting post 14, which is carried by, but suitably insulated from, the base plate 10. Adjustably mounted in the upper end of the conducting post 14 is a screw 15, which is provided with a contact 16, the contact 16 being the stationary dot contact. Conducting post 14 is electrically connected by a jumper 1'7 with a second conducting post 18, the conducting post l8being carried by, but insulated from, the plate 10. Adjustably mounted in the upper end of the conducting post 18 is a screw 19, which carries the contact 20. The contact 20 is the stationary dash contact. i

Mounted upon the base plate 10 is a metal bridge 21 which supports a lever 22 for movement in a horizontal plane around a vertical axis coincident with the center of screw 23. Bridge 21 is provided with arms 21, and 21 said arms being provided respectively with screws 24.- and 25, which define the limits between which the lever 22 may be moved. A compression'spring 26 acts between the long arm oflever 22 and a screw 27, carried by the bridge arm 21 said spring normally holding the long arm of lever 22 in engagement with the screw 24.

Normally disposed in substantial alignment with the lever 22 and carried thereby is an oscillating. arm-28, which is provided with a weight 29 which may be adjusted longitudinally of the vibrating arm and secured at any desired position thereon.- The vibrating arm 28 is connected to and supported from the long arm of lever 22 through a leaf spring 30, which has one of its ends rigidly secured to the longarm of lever 22, and its other end rigidly secured to the adjacent *enol of'the vibrating arm 28. Fixed to the vibrating arm 28, preferably near the point of its attachment to the spring 30, is a substantially U-shaped leaf spring 31, which at its free endis provided with a contact 32, the member 32 constituting the movable dot contact.

At 33 I have illustrated a roller which is adapted to bring the vibrating arm 28 to rest when the long arm of lever 22 lies against the screw 24. The roller 33 is pivoted to one end of a substantially L-shaped lever 34, which bridges the free end of vibrator arm 28 and has its'other end pivotally mounted in a suitable bracket 35. When the lon 25, the roller .33 does not interfere with vibration of the vibrating arm 28. It'should be noted that if the free end of the viarm of lever 22 lies against the screw I bratingarm 28 ismoved forcibly into contact with the roller 33; the lever 34will turn on its pivot, the roller -being lifted against gravity by reason of its contact with the vibrating arm.

I now call attention to the actuating lever 36, which is provided with a finger piece 37, the latter being preferably formed of insulating material. One end of the operating lever 36 normally lies snugly in contact witht-he short arm of lever 22, and is held yieldingly insuch contact by a compression spring 38, which is disposed around a screw 39, and acts between the short arm 1510f 1ever'22 and an adjustable collar carried by such screw. The screw'39 is fixed to the operating lever 36, and extends freely through an opening in the short arm of lever 22. Said opening is indicated by dotted .lines in Figure 1. It will be understood that this opening has a diameter greater than the diameter of screw 39, so that the operating lever 36 may move relatively to the lever 22 in the manner presently to be explained. The operating lever is pivoted by a pin 40 for movement around a vertical axis, ,determinedrb'y such pin. The pin 40 preferably extends through the lever 36,-an-d bears in a bracket member 41, which is lined .to the long arm of lever 22 at a point adjacent the pivot of said lever22.

The actuating lever 36 carries a contact 42 which constitutes the movable dash contact. It will be understood of course, that the contact 42 is grounded to the frame 10,

and that the movable dotconta'ct is likewise'groundedto the frame 10. At 43 is indicated afknife switch which is'always open when the instrument is in use, the switch .40 being closed only when the stationary contacts 16 and 20 are to be grounded to the framelO.

It willbe understood that when the actu ating lever 36 is moved in a clockwise three-- ::45 tion (as vlewed in Figure ,1) the actuating lever will turn'on its-pivot pin lLto permit the iinovable fdash contact to. engage its associated stationary contact. thespring 26 holds "the lever 22 in engage- ,50 inent withscrewQd, the spring 38 yielding -to ,ebermit the actuating ,lever 36 to move relatively to .the lever 22. \Vhenthe actuat ing lever 36 is IIIOVGCl in a, counterclockwise 1 direction (as viewed in Figure 1) the long 155 arm oflever 22 ismovedout ofengagement with screw 2,4 and into engagement with sscrew 25. The vibratingarm 28 no longer lies'in engageinent withrolleri33, and such arm is .free to vibrate,the periodicity of its 160 VlblfitlOll being determined by the adjust- I thi case, mounted upon fixed binding post 11.

shown in the accompanying drawings need not differ essentially from well-known types of telegraphic transmitters now in use. The specific mechanism illustrated in the accompanying drawings is in many respects similar to the well known Martin vibroplex, which is well-known to all persons familiar with modern telegraphic apparatus.

I shall now describe those elements oi. the herein illustrated device which are the salient features of my present invention. Can ried by the vibrating arm 28 and conveniently. secured to or torn ed integral with the collar which also carries the ii-shaped spring 31.1s a metal block A. which ronof the core being ,adjustably secured by nuts 7f in an r p-turned portion of a bracket G. The bracket G is pivotally mounted at It, upon one end of an arml, the other end of which is supported on the binding post 12. It will thus be seen that the electromagnet may be adjusted toward and away from the armature A by turning the electromagnetaroundthe vertical axes determined by the screw 71.", and the binding post 12. Further adjustn'ient may be see cured by properly positionin the nuts f- 7'. One terminal of the electroin let winding 0 is connected with the binding post-12. The other terminal of the electromagnet winding is connected with a binding post J, which is conveniently mounted u-pon one end of an insulating block K, which has its other end binding posts J and 11 are adapted to be connecteddn vany suitable telegraph circuit by leads indicated at L-L.

In modern long-distance telegraph work,

,it is very" desirable that all of the current impulses corresponding to dots be of uniform duration, and it is also highly important that any series of short impulses corresponding to a series of dots occur with absolute regularity. This is true because in long-distance telegraph systems it is necessary to employ dehcate repeating and receiving apparatus, .WlllCll w1ll respond properly only to dot impulses which are of adefinite duration, andwhich when sent in a series occurwith regularity.

.I ,findithat inIthe ordinary transmitter of form of electromagnet herein The ' occur with regularity.

tion. Let us assume that the actuating lever 36 is moved in acounter-clockwise direction (as viewed in Figure 1). As soon as the vibrating arm 28 begins to vibrate, the con tact 82 engages the contact 16 to causethe transmission of a dot impulse. As soon as the contacts close, the electromagnet B is energized and attracts itsarmature A, thereby tending to separate the dot contacts. rate, the electromagnet B is de-energized. I find that so long asthe lever 22 is held in engagement with the screw 25, the vibrator28 of the device of my invention will continue to vibrate with a definite and constant amplitude. Therefore the dot impulses are of uniform duration and occur with absolute regularity.

Prior to sending messagesover the longdistance telegraph line, it is ordinarily necessary to send over the line a long series of dot impulses to permit the proper adjustment of the various receiving and re peating devices. For best results, it is desirable that these dot impulses be of uniform duration and occur in a long, unbroken series. It is possible to secure a long, unbroken series of dot impulses by the use of the device of my invention, because the vibrator 28 continues to vibratewith constant amplitude so long as the lever 22 is held in, engagement with the screw 25. With the ordinary telegraphic signal transmitter of the vibrator type, it is practically impossible to secure an unbroken series of more than approximately 12 or 15 dots, and even these do not occur with that degree of regularity, and are not characterized by that uniformity of duration which my experience has demonstrated as necessary to best results in modern long-distance telegraphic communication.

It will be noted that in the operation of the device of my invention, the electromagnet B is energized each time the dash contacts are-closed, as well as each time the dot contacts are closed. Now let us assume that the dash contact 42 is moved manually into engagement with the stationary contact 20. The electromagnet B is energized and the armature A is drawn over into engagement with or in close proximity to the adjacent end of the electromagnet coree. Lever 34 yields to permit such movement. As a result of this movement, the vibrating arm 28 is moved away from the stationary dot contact the spring 30 As soon as the dot contacts sepa being stressed. Now as soon as the dash contacts are separated, thereby de-energizing the electromagnet, the vibrating arm 28 swings quickly toward the stationary dot contact due to the energy stored in spring 30. This arrangement is of great advantage because immediately after the cessation of the dash impulse the vibrator arm 28 will swing quickly to efiect the sending of a dot impulse or a series of dot impulses. The distance through which the vibrator arm 28 must move before effecting the sending of a dot impulse following a dash impulse is sufficiently great so that the operator may, if he desires, send two or more dash impulses without trans mitting any intervening dot impulses.

The electromagnet B. of the device of my invention is, of course, energized by the signaling current flowing in the circuit controlled bythe dot and dash contacts.

Having thus illustrated and described a preferred embodiment of my invention, I do not limit myself to the specific construc tion and arrangement of parts herein shown and described, but wish to cover all equivalent arrangements falling within the terms and spirit of the appended claims.

What I claim is new and desire to secure by Letters Patent of the United States is:

l. A telegraphic signal transmitter comprising normally separated dot contacts, a

vibratory member adapted when vibrating to effect the engagement and disengagement of said dot contacts, manually operable mechanical means for initiating vibration of said vibratory member, an electromagnet adapted when energized to attract said vibratory member, and circuit connections whereby said electromagnet is energized when said dot contacts are in engagement, and deenergized when said contacts are separated.

2. In combination with a telegraph circuit, a pair of normally separated dot contacts, adapted when operated to. complete and interrupt said circuit, a vibratory member adapted when vibrating to cause the engagement and disengagement of said contacts, manually operable means for initiating vibration of said vibratory member, and electromagnetic means for maintaining the amplitude of vibration of said vibratory member constant, said electromagnetic means comprising a magnet winding included in said circuit.

3. In combination with a telegraph circuit, a pair of normally separated dot contacts, adapted when operated to complete and interrupt said circuit, avibratory member adapted when vibrating to cause the en gagement and disengagement of said con tacts, manually operable mechanical means for initiating vibration of said vibratory member, and electromagnetic means for maintaining the amplitude of vibration of said vibratory member constant, said electromagnetic means comprising a magnet winding included in said circuit, together with a pair of normally separated dash contacts that are manually operable to complete said telegraph circuit.

a. Means or transmitting telegraph signals comprising a vibratory member, a member from which said vibratory member is supported, a flexible leaf spring connecting said members, a pair of normally separated co-operating dot contacts, one of said contacts being stationary, the other of said con tacts being carried by the vibratory member, a telegraph circuit controlled by said dot contacts, said movable dot contact adapted to engage and disengage the stationary dot con tact as said vibratory member vibrates, manually operable means for initiating vibration of said vibratory member, and an electromagnet excited by the current traversing said circuit when said dot contacts are in engagement, said electromagnet adapted to maintain the amplitude of vibration of'said vibratory member substantially constant, by attracting the vibratory member away from the stationary dot contact.

5. Means for transmitting telegraph sig nals comprising a vibratory member, a member from which said vibratory member is supported, a flexible leaf spring connecting said members, a pair of normally separated co-operating dot contacts, one of said contacts being stationary, the other of said contacts being carried by the vibratory member, a pair of normally separated manually operable dash contacts, a telegraph circuit controlled by said dot contacts and said dash contacts, said movable dot contact adapted to engage and disengage the stationary dot contact when the vibratory member vibrates, manually operable means for initiating vibration of said vibratory member, and electromagnetic means adapted to maintain the amplitude o1 vibration of said vibratory member substantially constant, said electromagnet being excited by current flowing through said circuit as a result of the engagement oi the dot contacts or dash con tacts, prolonged excitation of said electromagnet resulting from the engagement of said dash contacts serving to stress the spring by means of which said vibratory member is mounted.

6. In a device of the class described, :1 vibratory member which, when set in motion, will continue to vibrate for a considerable time, manually operable mechanical means for initiating vibration of said vibratory member, a pair of normally separated dot contacts operated by said vibratory member, an electromagnetic positioned adiacent said vibratory member, an armature for said electromagnet carried by said vibratory member, and a telegraph circuit including said dot contacts and said electromagnet whereby said electromagnet is energized and de-ener gized as the ,dot contacts engage and disengage due to the movement or" the said vibratory member.

In witness whereof, I hereunto subscribe my name this 9th day of January, 1922.

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