US1389683A

US1389683A - Sound-box

Info

Publication number: US1389683A
Application number: US326419A
Authority: US
Inventors: George A Moore
Original assignee: Individual
Current assignee: Individual
Priority date: 1919-09-23
Filing date: 1919-09-23
Publication date: 1921-09-06
Anticipated expiration: 1938-09-06

Description

G. A. MOORE.

SOUND BOX. APPLICATION FILED SEPT- 23, l919- RENEWED SEPT. 25, 1920. ,389,683.

Patented Sept. 6, 1921 Inven lo a", George ilMoore; 2.3

CLZZBrne UNITED STATES PATENT OFFICE.

GEORGE'A. moon, or mnnronn, MASSACHUSETTS. Y

Application filed September 23, .1919, Serial No. 326,419. Renewed September 25, 1920. Serial No. 412,893.

To all whom it may concern Be it known that'I, GEORGE 'A. MOORE, a citizen of the United States, and-a resident of Medford, in the county of Middlesex and Commonwealth of Massachusetts, have invented certain new and usefulImprovements in Sound-Boxes, of which the following is a full, clear, and exact specification. 7

This invention has for its object the construction of improved means for pivotally supporting the needle armof a talking machine sound box.

To this end, I clamp the needle arm to a diaphragm supported'at right angles to the plane of the resonator diaphragm, and-provide means whereby the clamping means can be shifted in the plane of its diaphragm in order that the point of the needle arms attachment to the resonator diaphragm may be entirely neutral thereto, in other words, that it may have no tension thereon in either direction.

In the drawings forming part of this specification, Figure 1 is a face view of a sound box embodying my improvements. Fig. 2 is a view of the same looking in the line of its stylus. Fig. 3 is a central sectional view of the same. Fig. 4: is a view similar to that in Fig. 2 but with certain parts removed. Fig. 5 is a perspectiveview of a portion of the needle arm and its supporting diaphragm. Fig.6 is a perspective view' of the threaded annulus composing a part of the clampingfmeans for the supporting diaphragm.- Fig. 7 is a sectional view of the same, Fig. ,8 is a sectional view of the other member of=the clamping means. Fig. 9 is a view ofone of the cross arms between which the supporting diaphragm is fastened. Fig. 10 is an edge view of the supporting "diaphragm showing the cross arms of the needle arm attached thereto. Fig. 11 is a face viewof the back plate of the sound box. 1 I I The sound box case comprises an annular member 1 and a back plate 2 suitably attached thereto, as by screws 3, the back plate'having a socket portion 4 for connection with-the tone arm of the talking machin in a well known manner.

Rigid with the annular member 1 and preferably integral therewith, is'a plate 5 Specification of Letters Patent.

' ""soUNn-nox.

as shown in Figs. 3 and 1. This plate has an opening 6 through it for the free passage of the needle arm section 7, and also two slots 9 near its extremities.

The needle arm is in two

sections

7 and 10, the section 10 containing the socket for the stylus 11, while the section 7 is attached to the resonator diaphragm in a well known way. The cross arm 12, as shown in Figs. 5 and 9 is provided withan ofiset lug 13 rigidly connected with the needle arm section 7. These

cross arms

12 and 14 have their center lines located in the same plane with the diaphragm 15and are attached to the opposite surfaces 'ofthe supporting diaphragm 16, preferably by rivets 17. The surface of each cross arm in contact with the diaphragm 16 is narrowed down to substantially the diameter of the rivets 17, as shown in Figs. 9 and 10, and its ends are further narrowed to points, as shown in Fig. 9.

For supporting the diaphragm 16, an externally threaded ring 20 is provided, and an internally threaded ring 21, the latter being constructed to be screwed on over the former. Each ring is provided with an annular lip 22 constructed to clamp the diaphragm 16 between them when the rings are screwed together. The ring 20 is formed with a diametrical 'recess, 23 of a width to snugly receive the plate 5, and is attached thereto by screws 24: passing through the slots 9 into the ring. Small pins 25 projecting from the ring 20 into holes 28 in the diaphragm 16 serve to keep the latter accurately in place for maintaining the parallelism between .the

cross arms

12, 14 and the diaphragm 15.

In the manufacture of this sound box, the outer surface of the plate 5 is made exactly at right angles to the plane of the annulus 1. The

needle arm sections

7,10 are attached to the diaphragm 16, and the latter clamped between the lips of the

rings

20, 21. Thenthe attaching end 27 of the arm section 7 is accurately ground to lie at right angles to the diaphragm 16, or, at least, to the inner surface of the recess 23; Now, the needle section 7 having been introduced through the opening 6, and the recess 23 pressed into engagement with the plate 5, the

rings

20, 21 are slid up or down therecate, will be transmitted to the resonator diaphragm.

' 15, so that there can be no vibration of the The narrowing of the contact surfacesof the

cross arms

12, 14, as shown in Fig, 9, is for the purpose of increasing the pivotal sensitiveness of the needle arm. It is, of course, necessary to have the cross arms of suflicient'width not to be weakened by the rivet holes, but by narrowing the contact faces and Widening the remainder of the cross arms, the desired narrowness obtamed wlthoutdimlnlshmg the strength;

This narrowness is further extended at points extending beyond the rivets, as shown in Fig. 9, for the purpose of dlminishlng the possibility of any vibration or yieldingly later ally in the same plane with the diaphragm 5 needle arm except in a plane at right angles to this diaphragm, thusfurther increasing the perfection of tone communicated to the sound box. a

As shown in Figs. Sand 11, I prefer to have the back plate 2 large enough in diameter to reach nearly to the extreme periphery of the annulus 1 and to form it with a notch 26 fitting the plate 5. This coactionof the notch 26 and plate 5 renders the act of positioning the back platein the annulus much easier and quicker than it wouldotherwise be, inasmuch assoon as the back plate has had its notch engage the plate 5 and is intro duced within its seat in the annulus, the

screw holes for the screws 3 will be fo accurately alined "and the screws can be inserted immediately. What I claim is:

'1. A sound box comprising a case, a resonatordiaphragm supported by said case,

o resonator diaphragm supported thereby, a

a pivotal diaphragm supported substantially at right angles tothe plane of the resonator diaphragm and with its center in the plane of the same, and a needle arm supported by the pivotal diaphragm and attached to the resonator diaphrag v 2. A sound box comprlslng an annulus, a

7 plate rigid, with the annulus and projecting at right angles to the plane of the diaphragm and in opposite directions from the annulus, a pivotalfdiaphragm, an annular member supporting the pivotal diaphragm and slidable on said plate, means adjustably binding the annular member to said plate,

and a needle arm supported by the pivotal.

diaphragm and attached to the resonator diaphragm, said plate having an opening phragm in opposite directions from the an-' nulus, a pivotal diaphragm, an annular member supporting the pivotal diaphragm and slidable on said plate, said plate having slots through it, screws passing through said slots into engagement with said member, and a needle arm supported by the pivotal diaphragm and attached to the resonator diaphragm. a r

"4:. A'sound box comprising an annulus, a resonatordiaphragm supported thereby, a plate rigid with the annulus and projecting at right angles to the plane *of the diaphragm, a pair of rings supported by said plate, one having aninternally threaded portion and the other a threaded periphery screwing intosaid portion, a pivotal diaphragm clamped between the ringsyand a needle arm supported by the pivotal diaphragm' and attached'to the IESOIliLtOlIllitphragm. V I

5. A sound box comprising a" resonator diaphragm, a pivotal diaphragm, two rings clamping the'edges of the latter between them, means movably'supporting said rings, and a needle arm attached at one end to the resonator-diaphragm and supported at an intermediate point by the pivotal diaphragm.

6. A'sound box comprising an annulus, aresonator diaphragm supported thereby, a plate rigid with the annulus and'extending at righ angles to the plane of the diaphragm, an externally threaded ring supported by said plate, an internally threaded ring'coacting with the former ring, a pivotal diaphragm clamped'between the two rings, means attaching the externally threaded ring to said platefand a needle arin'supported by the pivotal diaphragm and attached to theresonator diaphragm.

7 A sound box comprising'an annulus, a resonator diaphragm supported thereby, a parallel-sided plate held by"theannulus at right angles to said diaphragm and having a longitudinally extended slot near each end, an externally threadedring slidably fitting said' 'pla' te, screws passing through said slots into engagement with said ring, an internally threaded ring coa'cting with the former ring, a pivotal diaphragm clamped between saidrings, and a" needle arm supported by said pivotal'diaphragm and attached to said resonator diaphragm. 8. A' sound box comprising an annulus, a resonator diaphragm supported thereby, an externally threaded ring, an internally threadedring coacting with th'former ring and-opposing the first-named ring, a pivotal diaphragm clamped between said rings, means connecting said rings and annulus, and a needlearm supported by the pivotal diaphragm and attached to the resonator diaphragm.

9. A sound box comprising a resonator diaphragm, a pivotal diaphragm supported near its edges at right angles to the plane of the resonator diaphragm, with its center in the plane of the latter, and a needle arm attached to the resonator diaphragm and to the pivotal diaphragm, the needle arm being formed with an offset for enabling it to avoid contact with the box and to present the needlein substantially the same plane with the resonator diaphragm.

10. A sound box comprising a resonator diaphragm, a pivotal diaphragm, means supporting the pivotal diaphragm, two narrow extended cross arms clamping the pivotal diaphragm between them with their center at the center of the latter diaphragm and lying in a plane parallel with the resonator diaphragm, and a needle arm attached at one end to the latter diaphragm, and intermediately supported by said cross arms.

11. A sound box comprising an annulus, a resonator diaphragm supported thereby, a pivotal diaphragm, means supporting the latter near its edges connected with said annulus, a needle arm terminally connected with the resonator diaphragm and having a transversely disposed cross arm, a second cross arm adapted to carry the stylus, and means clamping said cross arms tightly together with the pivotal diaphragm between, the surfaces of the cross arms in contact with the pivotal diaphragm being quite narrow in comparison with the portions of the pivotal diaphragm beside them.

12. A sound box comprising an annulus, a resonator diaphragm supported thereby, a plate held by said annulus at right angles to the diaphragm having an opening through it, a pivotal diaphragm supported by said plate substantially parallel with it but spaced therefrom, and a needle arm in two sections each having a cross arm, means clamping the cross arms together at opposite surfaces of the pivotal plate, one of the sections having a socket for the reception of the stylus, the other section being attached to the resonator diaphragm, and passing through said opening, one of said cross arms having a projection therefrom substantially parallel with the pivotal diaphragm but spaced therefrom and connecting this cross arm with the last-mentioned needle arm section. 7

13. A sound box comprising a resonator diaphragm, a pivotal diaphragm, a needle arm attached to the resonator diaphragm, united means supporting said diaphragrns, and means attaching said needle arm to the pivotal diaphragm consisting of two cross arms lying in the same plane with the resonator diaphragm with the pivotal diaphragm, between, and rivets or the like passing through said cross arms'and clamping them and the latter diaphragm tightly together, the surface of each cross arm contacting with the pivotal diaphragm being narrowed to substantially the diameter of said rivets.

14:. A sound box comprising a resonator diaphragm, a pivotal diaphragm, united means supporting said diaphragms at right angles to each other, the center of the pivotal diaphragm being in the same plane with the resonator diaphragm, a needle arm attached to the resonator diaphragm and supported by the pivotal diaphragm, and a stylus carried by the needle arm with its axis in the same plane with the resonator diaphragm.

In testimony that I claim the foregoing invention, I have hereunto set my hand this 15th day of September, 1919.

GEORGE A. MOORE.