US1015321A - Sound-conveying device for talking-machines. - Google Patents

Description

E. R. JOHNSON.

SOUND CONVEYING DEVICE FCR TALKING MACHINES. APPL'ICATION FILED DEG. 24, 1903` 1 ,01 5,32 l Patented Jan. S3, 191m.

l UNITED STATES PrlENT OFFICE.

ELDRIDGE R. JOHNSON, 0F PHILAELPHIA, PENNSYLVANIA, ASSIGNOR T0 VICTR TALKING MACHINE COMPANYyk A CORPORATION 0F NEW JERSEY.

SOUND-CUNVEYING DEVICE FOR TALKING-MACHINES:

Specification of Letters Patent.

Patented Jan. 23, 191%.

Application led December 24, 1903. Serial No. 186,482.

which the following is a full, clear, and

complete disclosure.

The object of my invention is to provide such a construction in connection with sound tubes of talking machines that the sounds produced may be modified andA purified, thereby particularly adapting 'said machinesfor the reproduction of speech and conversation, and is particularly adapt-A ed to those machines where the sound tubes are placed directly in or at the ear of the person listening to the -sounds produced by said machine.

The sound produced by the disk type of talking machine is of such a volume and K character when conveyed directly to the ear through. the usual ear tube that it is necessary to reduce the volume and purify the tone to prevent the annoying and undesirable vibrations from being objectionable. This is accomplished by providing means for. selecting the desirable and useful vibrations required, and allowing only such to be conveyed to the ear. In this instance the means comprise a damper or what may be called an acoustic filter which is inserted at a suitable point in the sound conveying means such -point being preferably that at which thehollow sound box carrying arlnis pivoted to its support. Machilies having this feature of construction are particularly adapted for the reproduction of conversation or speech which is required in teaching foreign languages by means of records having distinct lessons in such language or` languages recorded thereon. In the latter use of talking machines it is essential and .necessary that the articulation andv pronunciation be very clearly reproduced without regard toI the volume, although it isof course, required to have the volume or intensity of the words reproduced sufficiently great to be easily heard. This result, the present invention accomplishes in a most successful and eilicient mannen A For a full, clear and exact description of one embodiment of mynin'vention reference s a part thereof, in which- Figure l represents a -side elevation of a talking machine having my improvements applied thereto; Fig. 2 a plan view partly in section of the hollow sound arm audits supporting pivot or trunnion; and Fig. 3 an, enlarged elevation, partly in section, of? the sound tube at its point of support, and showing my improved damper or acoustic lter in position therein.

Referring to the drawingl indicates the usual motor Casing having rotatively mounted thereon the turntable 2, which carries the sound record 3. Mounted above said turnt-able and record 'is a hollow arm Lt carrying the usual sound bor 5 which inconnection with the record reproduces the sound. The

-hollow arm 4f has a bend 6 at its outer end with which the sound box 5 is connected so that the diaphragm is practically in a plane parallel with the said tube. rl'lie other end of said tube has an upward bend or curvedv portion- 7 which extends practically vertically at right.l angles to the main portion fi and is telescopically connected with an outwardly curved elbow 8. The parte ofthe telescopic joint between the sections '7 and 8 are held in engagement in any suitable or well known manner, such as by having a tight t which holds the parts in engagement frictionally or by providing the parts with screw threads. To vthis part of the tube 8 the usual flexible sonndconveying tube 9 may be connected. This tube 9 is preferably 'made of rubber and hasnt its end the well known ear pieces for 'entering or contact-ing with the ear. The telescopic portion of the' tube 8 which` connects with the portion 7 is formed by enlarging the lend of said tube 8 as indicated-at 10 so that its internal diameter is substantially' the same as 'the external diameter of the part 'i' of the tube/4. This enlargeinentrl forms a slight shoulder 1l' which acts inl the nature ofa ,flange or-seat against which af diaphragm'lf may rest'andv be held in pol' sition. `The diaphragm l2 is .referably' made of elastic, flexible material, soft rubber and is held in position-against said shoulder 11 by means of a flexible ring 13 of metal or othersuitable material. The enlarged portion l() is provided with horizontal pivots or trunnions le: which fifi liti

such. as

. other part of said tube.

said shoulder, and a fiexible ring for holding" said diaphragm seated upon said shoulder.

8. In a talking machine, the combination of a soundreproducer, a sound conducting tube having an interior Acircumferential shoulder, a diaphragm seated against said shoulder, and fiexible means for holding said diaphragm in position.

9. In a talking machine, the combination of'a sound reproducer, a sound Conduct-ing tube provided with a joint therein having an interior shoulder and-a diaphragm disposed intermediate of the ends of said tube l and arranged to be held in position between the parts of said joint against said shoulder, and arranged .to` transform the sound Waves received 1n one part ofv saidtube and dlreot said transformed Waves through the Scopoally 'connected with said arm, at 'the end Opposite said reproducer, and an elastic y lim erforate diaphragm extendin across sai tube at said, connection remote rom the diaphragm in said reproducer and formi-ng an inclosed chamber therewith and an opposed open chamber in said tube.

" Inwitness whereof I havehereunto set my hand this 21st day of December, A. D.,

ELDRIDGE R. JOHNSON. Vitnesses:

` FREDK. C. EBERHARDT,

CHAs/K. BENNETT.

Images