US946015A

US946015A - Sound-box.

Info

Publication number: US946015A
Application number: US39244307A
Authority: US
Inventors: George L Coleman
Original assignee: Victor Talking Machine Co
Current assignee: Victor Talking Machine Co
Priority date: 1907-09-12
Filing date: 1907-09-12
Publication date: 1910-01-11
Anticipated expiration: 1927-01-11

Description

G L. COLEMAN.

' SOUND BOX.

APPLICATION FILED 3391212, 1907 946,01 5;, Eatenssd Jan: 191% W'ITNESSES provide means iirr s as a rnnr enric GEORGE L. comment, or CAMDEN, NEW JERSEY, AssIeNoa 'ro vrc'roza TALKING MACHINE COMPANY, A ooaroanrron or new JERSEY.

sounn iaox.

Specification of Letters Patent.

Patented Jan. it. 15nd;

Application filed September 12, 1907. Serial No. 392,443.

To all whom it may concern:

Be it known that I, GEORGE L. COLEMAN, a citizen of the United States, and a resident of the city of Camden, county of Camden, and State of NeW-Jersey,il1ave invented certain new and useful Improvements in Sound-Boxes, of which the following is a full, complete, and exact description.

The main Objects of my invention are to simplify the construction of the sound box;

with a view to rendering the parts readily removable and replaceable; to so design and combine the parts as to form a compact, neat and durable construction; to rovide an improved mounting for the iaphragm; to for preventing injury to the provide an improved stylus bar mounting; to provide an improyed yielding mounting for, the box; and to provide other improvements which will appear as the invention is further disclosed.

In the accompanying drawings: Figure 1 is a front elevation of a sound box constructed in accordance with this invention; Fig. 2 a side elevation of the same; Fig. 3 a bottom plan view of the same; Fig. 4: a longitudinal section of the same upon line 44 of Fig. 1 lookiin in the direction of the arrows; Fig. 5 a i ragmentary perspective upon an enlarged scale of one side of the sound box casing; Fig. 6 a perspective in detail of the stylus bar; and Fig. 7 a perspective in detail of the plate for securing the stylus bar to the box.

Referring to the drawings,

diaphragm; to

the device comprises a casing consisting of a flat annular plate 1, provided at its outer periphery with .a rearwardly extending cylindrical flange 2,

integral therewith and having upon its rear edge an outwardly extending flat annular flange 3, the flanges forming a recess for the reception of the inner edge of a cylindrical cap or cover 4 having upon its front edge an inwardly extending annular flange 5, forming the face of the box.

lnjan internal groove between the front of the, plate 1 and the inner surface of the flanged cover 4 carried thereby, is a eylindrical ring 6, which forms a mounting for the diaphragm 7 The ring 6 is substantially rectangular in'cross section, and equal injwidth and outside diameter to the width and diameter of the said groove. v

The circular plate 1 forming the rear side of the sound box is provided, concentric with its central aperture, with a yielding tubular extension 10, of soft rubber or other suitable material, secured to the rear face of the plate by means of the screws 11. This tubular extension has its outer end reduced in outside diameter, and has within its bore a non-yielding bushing or lining 12 of brass or similar material, and is adapted to be secured over a sound conducting arm for transmitting the sound waves from the diaphragm to the usual amplifier.

The front and rear portions of the sound box casing are held together by means of screws 13 extending longitudinally of the box through the outwardly extending flange of the rear plate of the box, and into the rear face of the cylindrical cap forming the sides and front or the box.

The stylus bar has a fiat tapering inner portion 14, and timber is phonetically con nected at its inner end L5 of the diaphragm. The outer, portion 16 of the stylus bar is offset rearwardly from the inner portion, is

cylindrical in sha e, and has a central lonitudinal socket or the reception of a needie 17, which is held in place by a thumb screw 18.

The inner and outer portions of the stylus bar-are connected by means of a plate 19 which is substantially uniform in thickness, and which has the front side 20 thereof bent inwardly away from the plane of the other side, and extending in direction substantially oblique to the fiat portion of the bar, and is slotted to receive the outer end of said portion, which is soldered or otherwise socured in position. The rear side of this plate which is semi-circular in' shape and in a plane perpendicular to the outer endof surface of the plate resting against the shoulder of the'bar formed by the reduced end. This plate 19 is further provided with lateral extensions 22, projecting oppositely in a direction parallel to the) diaphragm, the inner edges of these projections being in the same straight line, substantially in alinement with the diaphragm, The outer ends of these projections are folded inwardly,

any other suitable process.

.these connections 23 supporting the stylus bar, yet I do not limit myself to this particular kind of material, as I have found that a very good reproductipn of sound may be obtained when soft copper cylindrical wires are used instead of the; steel spring, thus showing that any yielding connection, whether resilient or not, will produce good results when used in this form of stylus bar.

The inner ends of the yielding connections rest upon a flattened surface 24: of the side of the sound box casing. This flattened surface is providedwith a seini-lcircular recess 25 for the reception of the inner half of the inner end of the cylindrical portion of the stylus bar so as to permit the bar to vibrate without touching against the casing.

The yielding connections supporting the bar are held in place upon this flat surface by means of the plate 26 which'is secured over the connections by means of the screws 27 assing through the plate and into the sound ox casing, the inner edge of the plate being provided with a rib 28 substantially equal in thickness to the thickness of the connections, the inner surface of the rib resting upon the flattened surface of the box, so

7 that the inner surface of the plate will remain parallel with the flattened surface of the box and will tightly hold the inner ends of the connections against the flattened surface of the casing,

The arrangement of the stylus bar with respect to the sound box casing is such that the longitudinal axis of the stylus bar socket and the axis of oscillation of the stylus bar are substantially in the plane of the diaphragm, consequently the vibrations of the upper end of the stylus bar connected to the diaphragm will be in a line normal to the diaphragm, and will have, therefore, no tendency to buckle the diaphragm, as would be the case were the axis of oscillation of the bar not in the plane of the diaphragm. With this construction in mind, it is evident that I have provided a sound box of simple, durable construction, in which the parts are readily removable, and in which the stylus isso constructed and arranged as to reproduce with extreme sensitiveness, and with great faithfulness, the sound waves traced uponthe record.

While I have shown this invention only as embodied in a sin le form, yet it is obvious 5 that various modi cations might be made in the form" and construction of this device within the scope of the appended claims,

seams without departing from the spirit of this invention or sacrificing any of the advantages thereof.

Having thus fully described my invention, What I claim and desire to protect by Letters Patent is:

1. I11 :1 sound box, the combinationvwith a casing comprising two separate parts forming an annular internal groove, of a diaphragm, and an annular mounting for said diaphragm in said groove, said mounting being substantially rectangular in cross section and being equalin width and diameter to the Width and diameter of said groove.

2. In a sound box, the combination with a casing, of a yielding tubular extension secured to the rear side thereof, and provided With an internal annular recess and a nonyielding lining in said recess. j 35 3. In a sound box, the combination with a casing, of a yielding tubular extension secured to the rear side of said casing, and a non-yielding lining in said recess, the inner edge of said linin being in contact with the rear side of sai casing.

4. In a sound box, the combination with a casing, of a yielding tubular extension secured to the rear side of the said casing, and a non-yielding lining within said extension, the rear edge of said lining being spaced inwardly from the rear edge of said extension.

5. In a sound box, the combination with a casing, of a yielding tubular extension secured to the rear side of the said casing, and

a non-yielding lining within said extension the rear edge of'said lining being spaced inwardly from the rear edge of said extension, and the inner surface of said lining being flush with the inner surface of the portion of the yielding extension which is in the rear of the rear edge of said lining.

6. In a sound box, the combination with a casing, of a yielding tubular extension secured to the rear side of said casing, and a non-yieldin lining within.said extension, the inner e ge of said lining being in contact with the rear side of said casing and the rear edge of the said lining being spaced in 5 wardly from the rear edge of the said extension.

7. In a sound box, the combination with a casing, of a yielding tubular extension secured to the rear side of the said casing and havin a reduced outer end and non-yieldinig lining for said extension spaced inwardly from the outer edge of said reduced end, the inner surface of said reduced end and saidlining being substantially flush.

8. In a sound box, the combination with a casing, of a yielding tubular. extension secured to the rear side of the casing and having its outer end reduced in outside diameter.

9. In a sound box, the combination with a casing, of a yielding tubular extension se-v eured to the rear side of the casing and having its outer end reduced in outside diameter, and a non-yielding lining covering part. of the inner surface ot said extension, the inner surface of saidolining being flush with the inner surface of the outer end of said extension.

'10. la a sound box, the combination with a flat annular plate provided with a rearwardly extending flange at its periphery terminating in an outwardly extending fiat flange, of a cap secured over the periphery of said plate and in the between said fian es, a yielding tubular extension secured to t e rear side of said annular plate concentric therewith and provided with an internal annular recess, and a non yielding lining in said tubular extension.

ll. In a sound box, a stylus bar provided with lateral extensions terminating in folded ends and yielding supports for said bar so cured in the folds of said extensions.

12. 111 a sound box, a stylus bar, lateral extensions upon said bar terminated in folded ends and resilient supports for said bar secured in the folds of said ends.

13; in a sound box, a stylus bar comprising an inner portion, an outer portion oiiset from said inner portion, an intermediate portion connecting said inner and outer portions, said intermediate portion being: provided with lateral extensions terminating in folded ends, and yielding supports for said stylus bar secured. between the folds of said ends,

14. in a sound box, a stylus bar comprising an inner flat tapering portion, an outer cylindrical portion provided axially with a stylus socket and an intermediate portion connecting aid inner and outer portions, said intermediate portion having a side turned ii'uvardly and slotted togreceive the outer .eni'i of said inner portion.

15. iii sound box, a stylus bar comprising an lnner portion, an outer portion and an intermediate portion, said outer portion being off-set from said inner portion and said intermediate portion being provided with an lip-turned slotted portion to receive the outer end of said inner portion and with an aperture to receive the inner end of said outer portion.

16. In a sound box, a stylus bar comprising an inner portion, an outer portion, and

an intermediate portion, said ouier portion being offset from said inner portion, the central part of said intermediate portion being substantially flat, and being provided with oppositely extending lateral projections terminating in folded ends, ant. yielding suports for said stylus bar secured between the 1.olds of said ends.

17'. in a sound box, stylus compr sing an inner portion, a cylindrical outer portion provided with a stylus socket, and an intermediate portion, said intermediate portion having a substantially fiat centralportion of semi-circular shape upon one side conforming to the cylindrical lower portion of the bar, and being provided on its opposite side with a bent slotted projection to receive the end of the inner portion of said bar, said intermediate portion being further provided with oppositely extending lateral projections terminating in folded ends, and yielding supports for said bar secured between lhe folds of said ends.

18. In a sound box, the combination with a casing having a flattened side, of a stylus bar. a yielding support for said bar, one end of said support resting upon the said flattened s1de,a plate resting upon the outer surface of said yielding support, and means to force said plate upon said yielding support to hold the same against said sound box casing, said plate being provided on one edge with a rib of substantially'the same thickness as the thickness of the end of said yielding support, whereby the inner surface of the plate is retained in a plane parallel to the flattened surface of the sound box casing.

19. In a sound box, the combination with a casing having a. flattened side provided, with a semi-circular'recess, of a stylus bar having a cylindrical outer end offset, from the inner end of said bar, said outer end projecting into said semi-circular recess but being spaced from the surface thereof, spaced yieldingsupports for said stylus bar, the inner ends of said yielding supports resting respectively upon the fiat side of said sound box casing upon 0 posite sides of the semi-circular recess, a at plate provided with a semi-circular recess on one edge, and with a rib u on the opposite edge, and means for ho ding said fiat plate against said sound box casing, and'against the ends of saidyielding supports to retain said la therefrom, and an intermediate por- 1 tionof substantially uniform thickness con-' necting said inner and outer portions, said intermediate-portion having one side turned away from-tho plane of the other side and slotted to. receive the end ot one of said other portions.

22. A stylus bar comprising an inner portion and an outer portion ofiset therefrom, and an intermediate portion, said interme: diate portion having one side'- turncd away r to receive one end of one of said first mentioned portions, and having its other side apertured to receive one end of the other of said first mentioned portions.

23. A stylhs bar comprising two portions offset from each other, and an intermediate portion connecting said first mentioned portions, said intermediate portion having one side substantially oblique to one of said ottset portions.

24. A stylus bar comprising two portions offset from each other, and a plate connecting said portions, said plate having one side substantially oblique to one of said portions, and being slotted to receive the same 25. A stylus bar comprising two portions off-set from each other, and a plate connect ing said portions, said plate having o e side substantially oblique to one of said portions.

26. In a soundbox, a stylus bar compris ing an inner portion, an outer portion and an intermediate portion, said inner portion being provided upon one side with a bent and slotted projection to receive the end of the inner portion of said bar.

27. In a sound box, a stylus bar comprising an inner portion, an outer portion provided with a stylus socket and an intermediate portion connecting said inner and outer portions, said intermediate portion having a side turned inwardlyto receive the outer end of said inner portion.

28.111 a sound box, a stylus bar comprising two portions, and an intermediate portion, said intermediate portion having one,

side bent and slotted to receive one end of one of said first mentioned portions.

. 29. In a sound box, the combination with 'a casin of a ieldin tubular extension therefor, and a non-yielding lining for said extension, said lining having a smooth cylindrical external surface.

GEQRGE L. COLEMAN Witnesses:

ALs'roN B. MoUL'roN, ALEXANDER PARK.