US1441862A

US1441862A - Sound reproducer for talking machines

Info

Publication number: US1441862A
Application number: US371983A
Authority: US
Inventors: Swan J Leveen
Original assignee: CARL E SHIELDS
Current assignee: CARL E SHIELDS
Priority date: 1920-04-07
Filing date: 1920-04-07
Publication date: 1923-01-09
Anticipated expiration: 1940-01-09

Description

Jan.9,1923., 1,441,862..

s. 1; LEVEEN.

SOUND REPRODUCER FOR TALKING MACHINES. .FIL ED APR. 7. 1920.

FIG. 2

ATToRA/Fv llf atentetl data ltlfidi saute 1 w i, swans. LEVIEEN, or

.7. '0 all whom it may concern Application filed rpm 7,

Be it known that l, SWAN J4. Lnvnm, a

jcitiaen of. the United States, residing "at liot'lr Island, in the COLllltYOf Roclrlsland and State of ltllmoia have invented certainv new, and useful [Improvements in Sound Reproducers for llalk ing Machines,"

' olf whichithe following is a specification.

My invention relates tosound reproducers "for talking machines and enrbodiesc'ertain novel features whereby the tones of the in- ".strument can begreatly modulated and the volume thereof 'reducechiwithout in any way interfering with the clearness and distinctness of the tones.

1 Most machines of the kind mentioned are provided with some means for modifying the volume of the sound produced thereby.

mlhis usually consists of some form .of shutill 5) ters or dampers which i are projected int-o or across the hornshaped passage through which the sound travels. These contrivanc always obstruct the passage to a greater or less extent, and interfere with the passage of a portion of the sound Waves.

"lhese sound waves are thus turned, or re :l'racted, toward the diaphragm, and hinder the free movement of the other sound waves, destroying the clearness of the tones,

and giving a muffled effect thereto.

@ne ofthe principal objects of the present invention is to overcome this fault. This is accomplished by means of devices which do not in any way interrupt nor interfere with the passage of the sound-waves through the horn or sound intensifying chamber of i the machine, but which are on the opposite side of the diaphragm therefrom, and 0011- trol the action of thediaphragm itself. v The constructlon, arrangement and operation of the various parts oi my invention a will be more fully understood from the following specification, reference being had to the drawings accompanying the same, in which:

Fig. l shows my invention in froi'lt eleva tiom detached.

2 is a vertical. cross-sectionthereof. represents the reproducer box, provided with a connection collar 2, within which box is supported the usual diaphragm 3. The box 1. has an extension 4, in which is held a circular plate 5, the edge of said plate having a screw connection with the part a so that each plate saute aohusted with,

rarest" noon rsnanto, trimmers, assrsnon or ONE-HAL]? (re cast it.

sntrnrins; or noon ISLAND, trimmers.

tit-teat i sounn'nisrnonucnn roe trarmneivracrrrnns.

1920. SerialNo. 371,983.

relation to the diaphragm. 6 is a needle arm, passing through a central opening-in handle 9, having aperforation which engages a pin 10 fixed inthe plate 5. i Said arm is projected into an arm 11 which a bearing on the plate stat the opposite side thereof, said arm having a bearing at a central point against a disk 1% secured to the plate 5, and perforated to permit the passage ofzthe arm 6. The arm 9 with its extensionll exerts a spring tension upon the disk 12, tending to hold the same outwardly, and preventing any vibration of the plate 5 which might be imparted thereto from the diaphragmf "The inner face 0-13 the plate Sills slightly r-lnicaved, andis provided with a lining'lll of fabric or other suitable material, which presents to the diaphragm a roughened face or surface. As is well understood the vi brations of the diaphragm cause the sounds to be imparted equallyon each side thereof. r If the lining 13 were not used the sounds moving outwardly from the dia phragm would strike against the plate and be refracted returning against the diaphragm, and causing a counter-sound through the diaphragm, tending to confuse thetones on the inner side thereof. The roughened face of the lining 13, however, absorbs the tones moving outwardly, and prevents them from interfering with the clear tones of the diaphragm which are passing through the horn of the machine.

As before mentioned, in some machines ithas been. customary to undertake to reduce the volume of the tones by means 0 t obstrucv tions in the passageway for such tones, but the same result can be produced by limiting or reducing the vibrating power of the diaphragm. This is accomplished inthe present invention by adjustment of the plate 5 towards the diaphragn'r and is caused primarily by the consequent redun" tent.

the diapln'agni iinrreasing as the plate approaches the latter. This tends to limitthe vibrations, changing the quality oi the tone, and. reducing the volume thereoi to some ex- As the iiim'eiiieiit oi the plate inwardly continues. howei'er. the outer whole of the lining comes in. Contact with the diaphragm, in. effect reducing the circumference thereof, and. still "further limiting the vibrations. This also operates to reduce the Volume of the tones on the inner side oi the diaphrae ni. The amount of eontact of the lining nith i'18 diaphragm can he gradually increased, until very limited portion of such diaphragm is permitted to vibrate, reducing, its tone iniparting power proportionately.

The action of the lining 1.8 upon the diaphragin has a tendency to increase the pitch.

of the tones which wonld'he refracted from the plate 5, and interfere with the tones on the opposite side of the diaphragm. if it were not for the presence of such lining, the roughened surface of which absorbs the sharp tones on the outer side oi? said dia phragm. The elearness and distinetness o the reduced tones is thereby retained.

The plate 5 also interferes with the tones on the outer side of the diaphragm escaping into the outer atmosphere, so as to interfere With and confuse the sounds produeed from the inner side of such diaphragni. in this account the use oi a ('(Hxl' or other means for enclosing the reprodni-i'r is not necessary, so far as these tones are concerned.

It will he obvious that when it is desired to increase the volume once more, this can he done by moving the plate 5 ouhvardly again.

There has been. shown in the drawings and set forth in the specification herein the preferred form of the inventiim, and it is obvious that changes can he made in. the construction and arrangement thereof Without departing from the spirit of the invention.

hat I claim and desire to secure. is:

In a device or the class desrrihed. the combination of a. reprodin-er hox and diaphragm mounted therein; a plate supported in said ho): hy a. screw-threaded connection. so as to be capable of adjustment with relation to said iliaphragm, and having; a l'Ull" cave face adjacent to said diaphragm; a lining on said concave face tapahle of moditying the vibratory tones of the diaphragm and means for rotating said plate, and oxerting tension. thereon to prevent vihration thereof.

In testimony whereof 1. aflix my signature.