US1258341A - Talking-machine sound-box. - Google Patents

Description

T. F. JONES.

TALKING MACHINE SOUND B0X` APPLICATION min JULY 2.1911.

' INVENTOR.

ATTORNEYS.

Patented Mam, 1918.. l

reruns ourson,

THE'AS l?. JONES, OF ML'XWOOD, ILLINIS.

TALKING-MAHINE SUND-BOX.

Specieetiono' Letters Eatcnt.

rateneeu Mar. 5, reis.

Application led July 2, 1917. Serial t'l'o. 175,165.

To all wwm t may concern.'

Be it known that I, THOMAS F. JON-ns, a citizen of the United States, residing at Maywood, in the county of Cook and State of illinois, have invented new and useful Improvements in Talking-Machine Soundoxes, of which the following is a specification.-

This invention relates to sound boxes of talkin@ machines, and its object is to provide a. noveland improved mountinv therefor whereby it is :tree .to rotate about its own axis .rather than swing bodily about an axis outside of itself, this arrangement resulting in certain advantages to be hereinafter pointed out.

In order that the invention may be better understood, refer e is had to the accompanying drawingibamiga part of this specification and in said drawing,

Figure l is a side elevation of a fragment of the tone arm ot a talking .machine and the sound box carried thereby;

Fig. 2 is a plan view thereof;

l? ig. 3 is a section on the line 3 3 of Fig. 2, and I Fig. e is a section on the line 4-4- of Fig, l.

Referring speciiically to thedrawing 5 denotes the tone arm of a talking machine having at its outerend a yoke, .the branches 6 or which open into central apertures 7 in the oppositeside walls 8 of the sound box. Between the walls 8 und extremities of the yoke branches 6 are interposed felt Washersv- 9 to retain the sound and to absorb jur. The sound box is in two sections formed by the walls 8 and the diaphragm 10 is held therebetween by rubber clamping rings 1l. rl`he diaphragm 1G has the usual connections l2 with the stylus holder 13. 0n the .sound bok are ears lll carrying pivot screws which engage. the trun'nions l5 on the stylus holder.

The sound box is supported by two arms i6 pivoted at 17 to the yoke branches 6.

As shown in Figs. 2and e of the drawing ,the outer ends of the yoke branches 6 have inward bends coinciding with the center of the sound box, between the ,Xtrein1t1esl oi which bends the sound boX 1s located.- The pivots 17 of the arms 16 coincide with the axis of the bends of the yoke branches and are therefore in the center line of the sound boX. Hence it will be seen that the sound bon is rotatably supported on an axis coincidingwith its center', and it does not swing bodily about a pivot outsidey of itself as in the conventional types of talking machines, causing the record disk to bear the weight of the sound box. By supporting the sound box so that it can turn about its owiraxis,

volume of sound and musicalovertones, and

surface friction or scratching is reduced to a minimum. The weight of the sound box may be increased, thereby forcing all vibra-.

tions to the diaphragm.V The compensation of the sound boX is axial instead of radial, that is to say, the l,compensation is secured by the sound box turning upon an' exis the center of which passes through the centerf of the diaphragm. This method of suspension of the sound loon will allow. or compensate for inequalities in 'the record disk, or the motion of the turntable carrying the latter. Sound boxes having a radial suspension also do this, but with less eihciency, for the reason that by a radial suspension more Weightiis placed on the needle. `The light pressure on the needle resulting from the axial vsuspension or the sound box will more readily absorb the inequalities hereinbefore mentioned, or compensate for them.l

Icleim:

l. rlhe combinationfwith a talking machine tone arm having laterally extending, branches at its outer ends 'terminating in inward bends; of a sound box rotatably positioned between the extremities of said bends, and peir of supporting erols connested t'o opposite sides of the sound box and pivoted to the aforesaid branches in line with the center of the sound boX.

2. .The combination With va talking ma- 5 chine tone arm having laterally extending branches at its outer ends; of a sound box rotatably located between said branches, and

supporting arms for the sound box fastened to the latter on oppostesides thereof and pvotally connected to the .aforesaid branches' 1o in line with the center of the sound box. f

In testimony whereof I aix my signature.

THOMAS F. JONES.

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