US1158309A - Transmitter for wireless telegraphy. - Google Patents

Description

C.SCHOU.

TRANSMITTERFOR WIRELESSIELEGRAPHY. APPUCATION FILED JAN. 12. 1914.

www, Patented Oct. 26, 1915.

3 SHEETS-SHEET I.

33 AWMM H27,

c. SCH-0U.

TRANSMITTER FOR WIRELESS TELEGRAPHY.

I APPLICATION HLED'JAN- 12. I914.

1,15%,809. Patented 001:. 26, 1915.

3 SHEETS-SHEET 2- C. SCHOU.

TRANSMHTER FOR WIRELESS TELEGRAPHY. APPLICATION FILED JAN. 12, 1914.

www. Patented Oct. 26, 1915.

3 SHEETS-SHEET 3- CARL SCI-IOU, OF HOLTE, DENMARK.

TmusMITTEn roa wranncsss TELEGRAPHY. v

I Specification of Letters Patent.

Application filedl'anuary 12, 1914. Serial No. 811,726.

To all whom it may concern:

]Be it known that L'CARL SCHOU, a subject of the King of Denmark, residing at Holte, Denmark, have invented certain new and useful Improvements in Transmitters for Wireless Telegraphy, of which the following is a'full, clear, and exact description.

Apparatus for very rapidly establishing interrupting or reversing weak telegraphic currents in accordance with the telegraph signals are known in connection with wire telegraphy and the present invention has referenceto the use of such apparatus for interrupting andestablishing weak currents with a view to producing the'necessary variations in the far stronger currents used for radio telegraphy. For 'this purpose. relays "are used in which a spring actuated armature is kept in direct contact with the cores of electromagnets and retained against the action of. a spring by residual magnetism, which magnetism is neutralized by a weak current having a direction opposite to that of the stronger current which has caused the attraction of the armature and produced the residual magnetism. The closing of the secondary circuit is effected by the armature being pulled away from the magnets under,

the influence of the spring, and as the spring acting upon the armature can be made rather-heavy, a fair pressure is secured be tween the contact making parts in question.

Relays ofthis kind are especially suited for the purpose setforth because at a certain speed of telegrap'liy currentimpulses of a certain shortdura'tion'are produced, and by distributing the work oni a plurality of re-" lays sufficient timef'can be provided for en} abli'ng the movable parts of each single relay to perform their movements, which move- I mentsneed not be accomplishedloy the time when the current impulse releasing the relay has ceased.- It is hereby possible to provide a transmitter capable'of Working at a very great speed. 7

In theannexed drawing Figures 1 4 show by way of example diflerent diagrammatic arrangements inaccordance with the present finvention -Figlfi is'a view showing the'consnection .between'the Wheatstone' transmitter the rest of tjhe apparatus.

designates? the contact device" the magnetizing current is cut off. The contacts 0 d e and far: opened when the arma tures are attracted, but as soon as a weak relay in opposite direction to that of the current which has effected the magnetizing, the armature is drawn ofi" by one of the springs g and the contact in question is closed- Patented Uct. 26, 1915.

'65 current impulse is sent through the coils of a Thirteen commutator disks or slip rings 72., i, j, is, m, n, 0, p, q, r, s, tand u are arranged on a shaft geared to the crank shaft of the Wheatstone transmitter in such a manner that it describes half the number of revolutions. of the latter. Springs or brushes are applied against these disks or slip rings as shown diagrammatically in the accompanying drawing By means of wires led along theshaft and participating in the rotation, the conducting segments 1, 2, 3 and 4 .on the disk hare respectively connectedwith the four slip rings 6, 7n, n' and 7) in the manner indicated in dotted lines, and these slip rings are in turn respectively connected with segments on the disks j, m, o and q as shown. The commutator disk It serves for distributing the work over the four relays; By means of the gearingbe ti iveen the shaft carrying the commutator and the VVheatstone transmitter provision is made that the contact a closes for a period "corresponding to the length'of a dot, when the-contact spring of the commutator disk It has just ,come in contact with a conducting segment and the current impulse has ceased before the spring has left the same. commutator disks-j, m, 0 and g serve for -.eifecting the attraction of the arlnatures 'of the relays after the same. have been released. The commutator disks 1', s, t and u are-constructed so as to stand the-effect of .the establishing and interrupting of the strong'telegraphic currents, and in the example shown the contact. springs of the The p commutatordisks'are .ar'rangdin series each with one of the contacts 0, (Z, c and f of the relays. The battery v serves for releasing the relays, and the battery w for be clearly understood.

a 9 represents the crank shaft, the rocking beam, and 10 is a gear on the crank shaft meshing with a gear 11 on the shaft 16 carrying the various distributing disks,

one of which It only is shown in this figure.v

If it be imagined that all the commutator disks are turned in the direction of the hands of a watch, and it is desired to transmit a dot, this is effected in the following manner: As soon as the spring 90 has come into contact with the segment Z for instance the contact a is closed and the battery 12 sends a current through the electromagnet of the relay 6,, the slip ring 2', the segment Z, the spring 00 and the contact a, whereby the armature is released and closes the contact, 0 owing to the action of the spring 9,.

The contact at a must, as already stated, have ceased before the contact spring 00 has left the segment Z. The contact at 0 requires a certain short time for being closed owing to the inertia of the parts and does not need to be closed when the spring 00 leaves the segment I but only before the segment on the disk r established the connection between the corresponding slip springs. As soon as this occurs, the circuit influencing the radio telegraphic transmitting system is closed through the wire y, the contact springs, the contact a and the wire 2. The length of the period during which the circuit is closed depends upon the length of the segment on the disk 1', and is about one fourth of the time required by the shaft for performing one revolution. 'lVhen the segment on the disk T-llilS passed the contact springs. and thereby interrupted the currents, the current tfecting the attraction of the armature'of the relay b is established so thatthe contact is interrupted at 0.

The magnetizing current in question is established, the segment on thedisk j passing its contact springs. Y The current .then passes from the battery w through the commutator disk 7', the slip ring 2', the coil of the magnetand back tothe battery 'w.

If the contact at. a is permanently established it is seen that all the relays will get into activity consecutively, and an electric connection will permanently be established between the wires 11 and 2. If the paper slip -u are arranged in series and each per 80 connected in parallel with the contacts 0, d, e and f. In this arrangement the commutator disks 1', s, t and u must be conducting over about three fourths of their circumferences, and the moments for closing or interrupting of the contacts 0, (Z,-e and f must fall within the periods during which the contact springs are short circuited by the commutator disks u, v, s and t. In this manner sparking at the contacts 0, d, e, and f isalso avoided.

The arrangement shown in Fig. 3 corresponds in all essentials to that shown in Fig. 1. The only difference is that instead of the four commutator disks 1', s t and u, only two such disks are used, viz: the disks 5 and 6, the former of which plays the part of the disks r and 26, while the latter replaces the disks 8 and u. The commutator disks 5 and 6 are, as shown, geared to the shaft of the other commutator disks, so that the disks 5 and 6 make the double of the number of revolutions made by the disks in Fig. 1-. This arrangement entails a reduction in number of the large commutator disks, but at the same times gives rise to the'drawback that the relays get a somewhat shorter time for performing their functions.

The arrangement shown in Fig. l is identical with that shown in Fig. 3, with the exceptionthat instead of the two commutator disks 5 and 6 two condensers 7 and 8 are used, which are constructed in such a manner that one of their armat-ures is stationary, while the other one is sector-shaped and rotates, being mounted on the shaft" geared to that carrying the commutator disks. The contacts of the relays are opened and shut when the capacity of the condenser in question is practically equal to naught. Hereby sparking at the contacts of the relays is also avoided. As in the above case thewires 3 and .2 are also here connected with one of the circuits of the transmitting system, and the alteration'which the capacity of a condenser undergoes by the sector swinging past the stationary armature will, if one of the corresponding contacts be closed, effect an alteration of the length of energy of the waves transmitted.

Having thus fully described my invention, I claim asnew and desire to secure by Letters Patent:

In an apparatus for transmission of telegraphicsignals a plurality of relays each having a spring actuated armature adapted to be retained by residual magnetism and to signal currents from the said transmitter 10 be released by relatively weak currents, a over the'said relays.

source of electricity, a number of contact In witness whereof, I have subscribed my milking elimelnts adapted to c %nn1ect the said signature, in the presence of two witnesses.

re ays Wit t e said source 0 e ectricity, a

transmitter mechanically connected to the CARL SCHOU' said contact making elements, and a distrib- Witnesses: uting device mechanically connected to the VIGGO BLOM, said transmitter and adapted to distribute CECIL V. .Sonou:

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