US1067718A - Telephone-transmitter. - Google Patents

Description

- 'J. COLLINS. TELEPHONE TRANSMITTER. LPPLIOATIOH FILED 00'1.21, 1912.

- WM). swoon [oz Patentd July 15, 1913.

W. n. oonm MAL-million,

Application filed heir/oer .21, 191:?

Y 1') all whom 1' i llbdj/ come m.

lie it known ll 1-17 I, JAIRUS Commie, :1, citizen oi the United Slates, residing at Qua-her City oouniy oi? Guer'nrey, and El oi Ohio have in ented certain new and mo fol lln provcmonl's in T4 ephoiio llransniil1- lors; and I do declare the iollmving to bo full, clear, and exact desoription oi lihe invention, 6; oh no will. enable others skilled in the ml to which it appertaino to make and iii-1o rho r-szmie, reforeiiice being ho d to he nooomponying clrzlwilogs and 110 (he lelilers and figures of reference marked lihercon, which formal part of this specilication,

invention relates to iniproveinenls in lielphone transmitters.

Oneobjcct is in so form the vilnolory (ii-w phmgm ask/0 permit its being quickly sombled and disassembled, providing on even lension upon the entire circumference, and doing away with the usual. soft rubber onshioning bond Anolhor object of my invention is to pro vide a l'ronsmill'or oi the type i n which both eleolzrodcs and their correlated ports supported entirely upon the diaphragm, and in which tho casings: containing ihe electrodes is supported upon the diaphragm only hymn flexible insulation. plate which forms the front cover of the casing *"he front clecnode being iigidly nupporlrd with Joel lo the diaphragm. I my construction, o rear elec node in inniniton'ied practically siltoiionar r by the force of inertia, while lhe front olor 'lgroder being oll' icl'ied rigidly to the l'lllilllk' ing diaphragm, rdoeives all of the vibrnlxions of the latter, and transmits them to the re sis-lance varying medium.

In the dnowing: Figure 1 is aside View, porily in section, showing the general orra-ngernenla of my invon-tion. E2 is :1 diamonds oroes seoiion through the lransproper, and a, portion of the dim 'oisrogi'o, llhe parts being shown in nmgnilied roportions for lhe sal e of cleorinaos. hi l. 0 is View similar to ll'ig. 2 but showing one portion of the trorihmiltor separoie from the other portion, and the resistance varying.

medium removed.

The same reference chomoiers indicole the some norl's in each of the views.

l. illnwroiced in v invention. on applied o tho llTll-lilfilunilli 21 n1 look sch, ii heino; the

Specification of Lotters Eetont.

lPn agonhcd July 151, 1913.

Seriiil l lo. 7%,928.

upright of such a set. The rear portion 13 oi" the transmitter is formed 01 metal, asv

usual, the faceplate 7 being formed also of inolial, and {ii-inched to he rear portion 6 by moons of lugs 8 and screws 9, as shown, or by any other suitable means. Into the facephil'e is threaded mouth-piece 10 of the oii-iilinnry type. The vibratory diaphragm 11 19 of metal or other snil'oble material, and is hold; forwardly iii its periphery to form :1 continuous flange 12 extending entirely around the diaph *agm, which flange is adapi'ed to lightly engage against an inner shoulder 13 formed upon the back of the faooploie l and cxljendii'ig entirely around the same. This means of scouring the diaphrogin lo the face-plate forms an imporl'onlfeature of my invention, as the parts may be readily assembled or disassembled merely by the use of slight pressure upon one or the other side of the diaphragm, and the use of The customary soft rubber cosh? ioning pad is avoided.

The resistance varying medium, prefer obly carbon granules, is incloscd Within a (1156 of drum shape of which the back elecl'JOflZ) 1. 1 may be utilized to form the rear oloonro. The cylindrical portion of the casing is composed. of a ring of hard rubber or other insnhrling imoteriola lhe'electrode 14 5: nd ring 15 being securely fastened together by on annular inecol "in-ember A similar inoiol nienibc 1i" surrounds the ring 15 upon. the other Side and holds loosely in place l'he insulation plate 1. which ll prefer to make of ln rd rubber, but for which mica is suitable. The front electrode 19 is of a diameter sligh less than the inside diameler of the ring 15, thus preventing any friction between the two parts when the device is in use. Carbon granules 20 are placed between the electrodes 14 and 19, and noa y fill l'he Space between these two elements. ln order to prevent these granules from crowding into the annular space between the electrode 19 and the ring 15, and between the electrode 19 and the plate 18, thus preventing the proper operation of the do'vi'ce, 1 place cotton fiber 21 in. said annuspoce. However, Ido not wish to limit myself to the use of cotton fiber for this nin'g iooe, it wi I be readily understood illlfillfi any dolly giiiclring material which will not form an' appreciable resistance to the movement ,of the parts upon'each other, will be satisfactory. It is advisable that a space .be left between the plate 18 and the electrode utilized to hold the bolt 23 and the casing diaphragm 11.

' wire 27 to the rear-.portion 6 of the trans mitter the current being conducted from this point through the metallic members 6, 7, and 11, and through the screw-bolt 23 to the front electrode 19. An insulation bushing 28 protects the wires t'rom'possible damage and consequent short-circuit through contact with the sharp edges of the hole in the rear portion 6 of the transmitter.

Particular attention is called to the fact that the plate 18 is smaller in diameter than the inside diameter of the annular member 17, and also that it is thinner than the space between the rubber ring loand the substantially vertical portion 29 of the annular member 17, when said annular member forced up firmly against the shoulder 30 of the rubber ring 15. By reason of this construction, that part of the casing which includes the back electrode 14, ring 15 and annular members 16 and 17, hangs loosely from the upper edge of the insulation plate 18, permitting this plate 18 to move back and forth within the casing in response to the vibrations of the diaphragm 11, while the casing, (including that part shown at the left in Fig. 3'and the annular member 17 remains practically stationary, due to the fact that the inertia of the cmnparatively heavy casing overcomes the tendency of the latter to move with the motion of the plate 18 in response to the vibrations oi the dia- ')hragm. I, therefore, have a substantially fixed electrode ltupon one side of the carbon granules, and an electrode 19 upon the other side of the granules vibrating with the This motion acts upon the granules to vary the resistance of the latter, causing variations in the intensity of the current passed through the granules, thus electrically transmitting sound, as will be well understood bv those skilled in the art.

to'said ring upon one side the periphery of.

the latter, a vibratory diaphragm, an insulation plate and a front electrode, both sup ported centrally upon said diaphragm, an annular member clamped upon said insulation ring on. the side opposite said back electrode, said annular member having an in-turned flange loosely engaging said insulation. plate, the latter being of a diameter slightly less than the inner diameter of said annular member whereby the said annular member, with the insulation ring and back electrode, hangs loosely upon saidplate, and a resistance varying medium located within said insulation ring between the electrodes.

In a telephone transmitter, an insulation ring, a back electrode securely fastened to said ring upon one side of the periphery of the latter, a vibratory diaphragm, an in sulation plate, a front electrode of a diameter less than the inside diameter of said ring, saidinsulation plate and front electrode being both supported centrally upon said diaphragm, an iinnular member clamped upon said insulation ring on the side opposite said back electrode, said annular member having an in-turncd flange loosely engaging the said insulation plate, the latter being of a diameter slightly less than the.

inner diameter of said annular member whereby said annular member, with the insulation ring and back electrode, hangs loosely upon said plate, so't'tpacking arranged within the annular space between said ring and front electrode, and a resistance varying medium located within Said insulation ring bet-ween the electrodes.

in testimony whereof I allix my signature in presence of two witnesses.

JAIRUS COLLTNS.

\Vitnesses EUGENE Benson, N. D. Bonron.

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