US1583449A - Telephone-receiver apparatus - Google Patents

Description

May 4 1926.

J. FLEISCHMAN TELEPHONE RECEIVER APPARATUS Filed June 1922 i To all whom it 71mg.conce rwh' Patented May 4', 1926.

I JOSEPHILEISCHMAQT, orivnw YORK, N. Y.

' rnrnr onn-nnonrvna APPARATUS.

Application-filed June 24,

Be it known that I, J'osEPH FLmsoHMAma citizenof the U'nited States, and resident f 1 a pluralityof persons withoutincurring the "listening in by a .multiplicity of persons distortions commonly associated with the use of amplifying horns Another object is tOK-PI'OVldB a radio re} ceiving set which shallre'nderpossible the without. the need for more than one telephone diaphragmg I -Another object is to provide a distributing receiver unit susceptible of use with asingle ordinary watch-type telephone receiver for ,cating. a preferred application of the re- 1P- faithful and efiicient delivery to a plurality oflisteners. p I

Otherobjectswill be in part obvious and in part pointed out. hereinafter.

In the accompanying drawings in which is shown one or more of various possible embodiments of the several features of this invention,

Fig. 1' is a transverse sectional view of a preferred" form of distributing receiver,

Fig. 2 is a plan view thereof,

Fig. 3 is'adetail sectional view on an enlarged scale taken along the line 3 3 of Fig.1,

Fig. 4 is a transverse sectional view on' a smaller scale of a modification, I I

Fig. 5 is a' transverse fragmentary view I of a further modification, and i Fig. 6 is a diagrammatic planview indi ceiver.

Referring now to the drawings, I have shownin Figs. 1, 2 and 3 a distrlbutlng re-f ceiver comprising a base block 1 of gen'erah ly cylindrical form having preferably a felt support 2. The telephone receiver proper is mounted upon the upper end of the block; This receiver comprises the usual watchtype casing 3 enclosing the usual electromagnets 4. and has the usual threads '5 at will be obvious.

1922; Serial"No.= 570,745.

the exterior thereof for tl'le earPlate. The? r Y upper 'e'n' d of the support block is tap ped I as: at 6 land the" casing 3 is threaded there 1 into, instead of into 'anearplate'.

telephone diaphragm 7 1preferablyrests' upon a peripheral ledge 8 forme'd': on

anannular hardflrubber plate 9' fitting snugly into an annular. depression 10' I in the support block below the tapped pertion 6,: the receiver: casing when threaded home preferably clamping the diaphragm-7f 'l 7 against thep'eriph'eral ledge 8 and clamping the disk 9'against the support blockl, a

felt washer 11 being preferably interposed to- 'render the connection sound tight-V The lower surface of'the disk 9 ispreferably dished as at 12"aboutthe central aperture 13 substantiallyin the manner of the ordi nary receiver earplate" and may, if desired,- be formed:from 'theordinary'earplate of a 'telephonereceiver by removing the-periphthe manner Whicl'ri eral portion thereof in ltwillbe: seen that the mu air came.

lt'below the diaphragm" and disk 9 constitutes. a sound chamber. fromawhich the vibrations originating in the di aphragm, are tobe passed onto the 'various listeners; a preferred form the support'block' has" small cylindrical. depression or well- 15 below the: sound chamber and communicates with' preferably four radial -ducts-:16{.throu 'li..- the distributing. block 'in' which fit' nipp es.

17, anyone or moreof which may bGfCOIl carry. the usual ear pieces ;19 forinsertion,

one into each auditory orifice. l odistrib ute' the sonorous energy equally and symmetrically to. the various outlets, :I prefer ably binaurals,the outer endsof which may to fit a spider 20rinto the cylindrical de-..

with rubber gaskets 24 to form a'ir tight range of the apparatusare listening.

The sound and llstrlbutlng ch ambersjlare ofsuch small volume as to be resonant to a pitch above: the range of audibility, asd is tinguished' from a. sound chamber of materially larger dimensions" that willresonate to *closuresfor the outere'nds of'the-nipples- 1.7' for those tubes not in use, when lessfthanthe maximum number of persons within the V some one definite pitch and may correspond ingly distort the sound.

In Fig. 4 is shown an alternative, form of the invention in which the base block has a cylindrical distributing chamber'25, nipples 26 in ducts 27 extending radially through the wall 28 for connection of the sound tubes 18. The diameter, of this chamber is preferably not more than 2.5 inches to avoid resonating to a high pitch within .the range of audibility.

In Fig. is shown another alternative form in which the distributing chamber 29 is of inverted generally conical form,.ducts 3O radiating from near the tip 31 thereof for connection of the nipples 32. The vibra-g tions from the diaphragm, it will be seen generate corresponding vibrations in the chamber 29 which pass toward the .tip 31 thereof, but are relievedthrough the radiating ducts and nipples 32 and pass on to the binaurals.

Except as heretofore described, the embodiments shown in Figs. 4 and 5 are preferably identical with that of Figs. 1 and 3.

In use, the multiple distributor may be placed upon a table, the telephone wires 33 1 and 34: being connected to the familiar telephone terminals of the radio set and each listener will take a pair of binaurals, caps 23 being used to close any nipples out of use.

In a preferred embodiment, the multiple receiver may be mounted upon or within a radio receving set of generally conventional external appearance. Fig. 6 shows a familiar form of such set including a box 35 having a panel 36 behind which is mounted a detector tube 37 visible through aperture 38 and adjustableby knob 38, operating knobs, one of which is shown at 39, serving for effecting the usual tuning adjustments, the terminal bin-dingposts for the ground and for the antenna being shown at 40 and ll. In my preferred form of set,

the usual telephone terminals would be omitted, and in lieu thereof, there would be sockets as at 4.2 for attachment of binaurals 18, these sockets being connected by conduits 43 to the multiple radio receiver Rof any of the constructions previously described, mounted in any convenient manner preferably within the box and to the rear of the panel. Thus, the telephone would be concealed and the binaurals merely would be handled and used by the listeners. Of course, caps such as at 44 would be furnished to close' any sockets not in use when the number of listeners is less than the maximum permitted by the range of the device.

Thus, it will be seen that I have provided a multiple telephone receiver of general application, but more particularly use ful for radio receiving sets. The device utilizes but a single telephone diaphragm andthus dispenses'with the need for a telephone or a pair of telephones foreach listener. It will be noted that the diaphragm vibrations are transmitted to the multiplicity of listeners without the distortions commonly accompanying the use of sound It W111 thus be seen that there is herein described apparatus in which the several features of this invention are embodied, and

which apparatus in its action attains the" various objects of the invention and is well suited to meet the requirements of practical use. w

As many changes could be made in the above construction, and .many apparently widely different embodiments of this invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawings'shall be interpreted asillustrative and-not in a limiting sense.

Having thus described my invention, what I claim as new and desire to secure by Letters-Patent of the United States is 1. In a distributing telephone receiver, in combination, a base block, an annular disk fitting into a corresponding depression in said block, and having :a peripheral ledge, a

diaphragm resting upon said ledge, an electromagnet casing threaded into said base block and engaging theperiphery of said diaphragm to clamp the, same in position,

and ductsthrough said base block in com-.

municationwith said depression to distribute the sonorous vibrationsgenerated by the diaphragm.

2. In a distributing telephone receiver, in

combination, a base block, aninsulating an-- nulus resting in the upper end of said block and dished at the surface thereof facing said block and having a peripheral ledge at the 1 other side thereof, a diaphragm restingupon riphery at the lower surface thereof and having a ledge about its outer periphery at the upper surface thereof, the upper end of said base block being interiorly threaded to accommodate the threaded periphery of the electromagnet casing ofan ordinary tele phone, whereby upon threading said casing into the upper end of said base block, the diaphragm will be clamped into effective po sition to set the air in said chamber into vibration and to distribute the sound there from uniformly through said ducts.

4. In a. distributing telephone receiver, in combination, a base block having a cylindrical chamber therein of dimensions to resonate to a pitch beyond the range of audibility, radial outlet ducts in said block communicating with saidchamber, and a telephone receiver threaded into said block and having a diaphragm across said chamber.

5. In a distributing telephone receiver, in combination, a base block having a cylindrical chamber, in theupper end thereof, radial outlet ducts communicating through thelateral wall thereof, a telephone receiver having an earplate annulus resting upon a flange near the upper end; of said base block, a

diaphragm resting upon said annulus, and an electromagnet containing casing threaded into the upper end of said block to'clamp the periphery of said'diaphragm in posi-. tion against said annulus. i

' 6. In a distributing telephone receiver, in combination, a base block having a small central distributing chamber generally conical inform, radial outlets extending through said block and communicating with said chamber, an ear plate fitting into a corresponding cylindrical depression in said block and above sald chamber and having a peripheral ledge, a diaphragm resting upon said ledge and a telephone receiver casing combination, a base block having a cylindriev cal axial well therein, ducts radiating from said well, apartition spider construction fitting into said well and 'frictionally held against adjoining wall portions between said ducts, and atelephone receiverunit having diaphragm connected to communicate its vibrations to said well.

Signed at New'York 1n the county of New York and State of New York, this .ZQndday so of June, 1922.

JO FLEISCHMAN.

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