US925609A - Microphone. - Google Patents

Description

H. R. STUART.

MICROPHONE.

APPLIUATION FILED MAB.. 21, 1908'.

Patented June 22, 1,909.

www-ceo HARVE R. STUART, OF WHEELING, WESTBVIRGLNIA.

MICROPHONE.

NQ. seneca.,l

Specii-catim1-v 0f Letters. Entente'. Appiieation med Maren 21, 199s. semi 1ra-422,396.:l

Patented use 32,.:.1999Qe To all rwhom t may concern:

Be it known that I, HARVE R. STUART, a citizen. of the AUnited States, residing Aat Wheeling,in the county of Ohio and State of We'st Virginia, have invented certain new and useful Improvements in Microphones, of which the; following is a full, clear, and exact description.

My'invention relates to telephonie relays to be used for receiving and transmitting voice currents, such as are presentin circuitsof telegraphones, telephones, etc., and

comprises a microphone and a pair of magnets, the armatures of which are connected respectively to the two electrodes ofpthe microphone so as to move the same simul" is a side elevation of a 'relayvconf Astljllited. in accordance with my invention. Fig. 2 is a section on line2-2 of Fig. -1. 'Figg is a perspective view showing the arrangement; of the magnetic parts of the re- 1ay,;the .supporting frame or body being removed for the. sake of clear-ness.

'The .relay shown comprises a wooden base acarryinga frame or body 1 of nommagnet c material,such as. aluminum, to which thezpmagnetic parts are. secured, and said arts as shown com rise four bar ma n ets P i a .2, 3, .4 and- 5, extending longitudinally with vres ect to the body, and in parallelism to eac ',other. The magnets 2 and 5 are secured.at .their respective ends byclamping screws 8 to .a ypair. .o U-shaped members 6 and 7 ofanagnetic material, which are in turn, secured toQzthe, body. 1 by the screws 9. Threaded-.Wthinthe upper ends of .the arms opposing screws 11 and 11 Aoi.` magnetic 1,1184. terial, which form the poleh ieees-l of, .the magnets 2 and, said screws.l eing he ],d in any desired. position oiadjustmentbsmlsjscrews. 12 threaded `in the. ends.-A of thefarmsp 10, Seid. arms being ,formedwth S1Qte..13i

which enable the arm to .bind .npon .--the screws v11 and 11.

Themagnets' 3 and. 4 lare securedat t he.ir ends to the T-shaped. members 14 and,. 15, each of which maybecomposedoftwo ing; verted L-shaped partsas ShOLWn. Thehogri: zontalarms of the Amembers-14 and l5 are secured to the body` 1 byscrews, not.shoyigi, $65l and vthe-magnets 3 and'4 are, secured lo, clamping plateslG-held byscrews 17, vvl 1 ir. liii arethreadedin the members 14 and15. The. lower ends of. the-members 14 l and i15.are t cut out as show'n in dotted lines in, -Fig', 3, forming lnotches within v which are sit u'a t e d the armatures 18 and 19 respectively, 'Whiql'k armatures are inthe shape o elongatedgrods, thel ends of .which are respectively adjacentM the ends of the-,pole pieceslljand11f,;`a11d 75 the centersof which are separated f romthe members 14 and 15 by a short air ga Said armaturesare movableQin a ilongit1'1'-ina1-di; rection, being supported at theirj centers,.in sleeves 20 secured to or. rigidwith. vibratory.- .80 levers 21. These levers are of. thegforrn clearly shown, in. Figj2, havingcentralbends which are secured by screws 22 threaded within said. levers .to Het .torsion s 'rings-23, the ends `of .which are enlar ed tb.,.0rm.111gf5' which are secured tothe' bogyfl bythe 24. The inner extremities of theleYlS 21 are secured respectivelyto the electrodes .25 and 26 of a microphone, which ci any desired form, Such as thewelljkIlQWIl ...90' carbon-.dust microphone, one of said; elec trodes being electrically. connected to, its operating lever which is in, e1ectr1ca1 co n nection with, the frame; or body'.l, gandwthe, other 'electrode lis insulated from its operat; 95- ing lever, and current is app,lied thereto through a .wire (not shown.)v connected in anysuitable manner. The electrodes 25 and 26er@ supported .by thelrrespectlve levers 21, and .are vibrated thereby. Thejmagnets 109.

Y .3 and 4 are so .arrangedthalt .similar p01@ lpfesaid, Ueshaped members, are pairs of..4

arefapplied .te the. members. .14. and -15A for..

ofelectrodes movab e toward and away polarizgngthessme, rnd the l mam-d ether 'of Vaiu Mode miV u 'the other.; Y5 are similarlyarranged for po a: Vthe armature, and coils for thevoice v arms 10and screws 11 and 11 The screws currents andvarying the flux entering said 11 are of the same polarity, and are of opposite polarity'to the pole piece 14.- The screws v11 are of the samepolarity and of' oppositev polarity to the pole piecev 15. The

armatures 18 and 19 are therefore bythe attraction ofipclev pieces at their o f hke ty and'acting in o posite direc- ;tion's. ere are four coils and tc tbeends of ceive thelvoice currents andjmay beloonnected either in series,'multiple, or series multlle, and they arevso wound that a. cur- Brent.l in one simultaneous'l'y w r en the flux passing-through one strengthen* the ux pA through cause thefarmature' to' move towardA the e 26. At the same time, the coils vwhich surround the me pieces 11 will weaken'the tlux p ugh one of said i:gole pieces strengten thellux passing. ough the :the the o rating lever 21 on its pivot, and 'moving e electrode26 away from the electrode 25. When'the current 1s;

reversed, the various o erations will bereversed and the-elect es 25 and 26 will be moved toward each other, whereby the twoelectrodes are vibrated in accordance wit Vthe waves of the voice currents.

Having now described my invention, what Iclaim, 1s: v

1. In 'a relay, the combination of ja microphone having a'. pair-of electrodes movable toward and away from each other, a pair of' armatures mountedindependently of each other, ivotal arms connected respectively to said e ectrodes and armatures, one or more magnets adjacent said armatures, and means.

for varying the iiux of the magnetic circuits and thereb moving the armatures in suchv a manner at the microphone electrodeswill .be simultaneously moved in opposite direc tions.` f

2. In a relay, the.f .combina`ti n of two or more magnetic circuits comprising separate armatures, a micro' hone comprising a air m each other, a ivotal arm connected to one of said elect es and one of said armatures and another pivotal' arm connected to tlxe *thecplixbination-,ot

.mex'nbem and? theu 11' applied 12' I the pole pieces 11 and 11', s'oastc surround the same,

the armatures 18A and vvcoils of the screws 11 and'pole pieceL14, and the. other screw-lbandpole piece 14, so asto' lmore magnetic circuits comp portions of sai 8. lIn a' evicerespoiiaxve to voice 2and 5,

U-shaped to of, a'nd -pole froml the arms ofisaxd '1 5. Ina device responsivetovoice currents, the combinationl ofthe "Gta3 and 4', and T-shape'd members thereof. f

6. In a device res nsive'tovoicecurren the combination o the w Bf 4, and'pole pieces -thereto vand-liavfI ..e;-. en dsfor'receiving the-armee:

h Puttarmatures, a microp one comprising .a of 'electrodes and a painof levies; mounted lOn vtl'inltl pivots nd H nl lillil' 8. In a relay, the combination ci twog more m netic circuits comprising onga longitudignallyl movable armatures, v poles pieces adjustabletoward and away 4from theends of said armatures, and pole c ppositepolarit1 adjacent the inte able towar trodes to the lother armature.

armatures, and al phone com rising'a' pair of electrodes movs and'aw'ay from each other, 'one -of said electrodes being vconnected to one of said armatures, and the other of 4said eleczrelay, the combinationof two or' `ends with said amahues'and microphone electrodes.:

les

non-magneticframe, a plurality of.bar magenets applied. longitudinally to `'the exteriorl thereo so as te inclosethe same and'pele- 'pieces extending to the interior of the frame I an armature and a microphone-within sai frafne, and 'a connection between am ture and said microphone for operating the latter.

10. In 'a rela the combination of a hollow non-magnetic ame, a'plurality of bar magnets a plied longitudinally to the exterior thereolso asto inclose the same and a micro phone situated within said frame, andconnected with the armature of said magnet.

11. In a rela the combination o f a micrephone el' e, an armature, a lever se;

cured its respective ends to vsaid armature and microphone electrode, and a torsion mature and of opposite polarity to said rst spring secured to the said lever intermedia-te po1e-piece and means for Varying the magits ends for supporting the same. net-ie ux of saidmagnetio circuit.

12. 1n a devlce responsive to voice curl In Witness whereof, I subscribe my signa- 5`1'entsf, the combination of one or more magture, in the presence of two Witnesses. y nets orining a magnetic circuit and .com ris- 'i ing one pole-piece formed with an opeiiing v HARVE R' STUART near the end thereof, a movable elongated Witnesses: armature extending through 'said' opening FRANK S. OBER, 10 and pole-pieces adjacent the ends of said ar- VVALDO M. CHAPIN.

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