US947395A - Transmitter. - Google Patents

Description

Rax.

W. E. MCCORMIGK. TRANSMITTER. APPLzcuroN funn JUNE is, 1905.

Patented 12h25, 1910.

the construction iliistrated in F ig.

in the appended claims.

j .sniffiis igiinnir onrion.

WILLIAM E. Mc i OBBI'CK, 0F CHICAGO, ILLINOIS, ASSIGNQR TO INTERNATIONAL TELE- .rnonn ma. ILLINOIS. l

f fammes med :une 19,

Tall inkom it may concern:

Be it known that L'WiLLiAM E. McConi lucir, a citizen of the United States,resid ing at Chicago, in the county of Cook and State of lllinois,'liaveinvented certain neviy and useful Improvements in Transmitters, of which the -following is a speciication,. reference being li'adtherein tol-the accom- This invention .relates tbiin'iprovements in telephone transmitters of that.character in which carbon Grot-herresistancevarying substance is located between the two electrades with which Jthe line connections are in circuit.. l i y The invention consists of the combina tionsand arrangements of parts hereinafter particularly described and then pointed ont Referring to' the accompanying drawings-Figure Al is'a sectional elevation of a transmitter embodying my inventiong' Fig. Q is a section on the line 2 2 of Fig.` 1; Fig. 3 is arear elevationivith'the cap and bridge removed; Figli is a' detail side elevation of thediaphragm,damping spring, carbon cup a'ndV the securing' device therefor in disassembled relationg'Fig. 5 is a side view partially iii elevation showing a modiiication of the invent-ion; Fi G is a perspective view ol the modified irm of damping spring; and Fie 7 isa sectional View of 5 with the parte separated.

Referring to the drawings, 10 indicates the usual frame which may beof any suitable forin and 'is provided with the usual mouth piece 11. -An inclosiiw case or capA l2 of suitable forni is secure( in any -preferred manner to a rearward annular flange 13 of the frame 10. A support or bridge 14 is secured as by screws l5 to thel flange L3 at opposite points and is provided with an opening 16 intermediate its ends Vin which is located a bush-in 17 which may be insu-V lated from the bri ge 14 as shown. A nut. 18 screwing upon the. front threaded end of the bushin 17 serves to secure the latter in position, athough it. is obvious that .the bushing may be secured in place by heading over its front end. A post '19 extends into the bushing 1'( and is adapted to be held in adjusted position, in the usua1 manner of TRANSMITTER.

VSpecification of Letters mirentJ Patented Jan. 25, 1910.

1905. 'seriai No. 265,839.

such devices, by a set screw 20.' This post i9 carries an electrodel which preferably is, gold plated and is located or projects into the cup 22 containing granular carbon'.

or other resistance varying substance, and is insulated from such cup by the supple# vIi'iental diaphragm :'24 of mica or other suit- `able material which may be secured tothe .electrode 21 in any suitable nianner.- The cnj 22 may be. of an suitable construction, an in the construction illustrated in Figs. l. and 4, itcomprises a body 25 having at Vits end adjacent tlie electrode. 2l 'an in- Werdl;v extending annular tlanfre 26 between which and a ring '2 the niica diaphragm :2l is clamped. The ring 2 is adapted to frictionally engage the cup and mayhave an internal insulating-strip ofpaper or other material, as at 28, insulating the carbon 23 from the cup. The band is provided at the end opposite the flange 26 with :in outwardly extending .flan e 29,' the purpose of which will be hereina-ter explained.

Bet. 'een the cup 92 andthe diaphragm 30,

wliich is seated in the depression in the 'frame 10 formed b v the longe 13 and provided wilh the usual insulating and damping rin 3l, the damping device 32 is located. This damping device is so constructed that in addi;ion to providing one of the, electrodes 'of the transmitter it is arranged to eilectually prevent excessive vibration of the diaphragm while at the same time the instrument is rendered exceedingly sensitive, and uniformity of vibration, `that is to say the vibration of the diaphragm as a unit, is msured. 'This damping device may be made of slieet'metal. such as steel, of suitable elasticity or resiliency, and in the present embodiment of the invention it comprises a dat central or body portion 33, which is in contact with the diaphragm 30. The area of the body portion 'of the damping device is at least as large as the opening of the cup 22 so as to entirely close the .same and pre- -vent spilling of the carbon; this central por: l

tion forms the. other electrode of ,the trans mitter and isV preferably gold plated for that purpose.' The damping device is provided with a plurality of spring arms 34, two of such arms being shown in the present embcdiinent 'of tbe invention. These arms 34 extend toward the rear of the transmitter nation with a iaphragm, a bridge having a air* of posts provided with cavities, a carcnn-containing cup, an electrode carried by the bridge, a supplemental diaphragm Se-V -eured to the electrode and to the cup, and a.

damping spring having a central portion closing the'cu and engaging the diaphragm and forming t xe other electrode, and having a pair of spring arms the ends of which are seated Vin the cavities ofthe posts on the bridge. A Y

1 1. In a tele hone transmitter, the combifv nat-ion with a 'aihragm andV a. carbon oonrtanning cup, of emping spring, and means for securing th'ei'diaphragm, cup and damping spring together independently of the transmitter ranle.

12.' In s, tele iidne transmitter, the combination with a ighragm, and a carbon-con taining cui) having a ange, o a damping spring hav a. Central portion closing the cup and a pan' of spring arms, and a retaining ring hafinr lingers pari-sing through the diaphragm an engaging the flange of the cup to secure the cup against the daxnping spring.

In testimon whereof I aix my signature in presence o two witnesses.

WILLIAM E. MCCORMICK. Witmess:

' ARTHUR B. SEIBOLD,

ELIZABETH MoLn-on.

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