US1347813A - Reproducer for talking-machines - Google Patents

Description

J.'W. KAUFMANN.

REPRODUCER FOR TALKING MACHINES.

APPLICATION FILED MAY 10. 1919.

m T 2. mw 9 N 1T A 7 M H l 2 U y A n E Jw w m N m m M m d P WITNESSES I TTORNEYS J. W. KAUFMANN.

REPRODUCER FOR TALKING MACHINES.

APPLICATION FILED MM 10, 1919.

1,3473 1 3 Pat nted July 27, 1920.

2 SHEETS-SHEET 2.

INVENTOR doH/v W HA UPMANN,

' ATTORNEYS 1 section of the inner gasket;

UNITED STATES PATENT OFFICE.

JOHN KAUFMANN, 0F BALTIMORE, MARYLAIID.

REPBODUCER Eon TALKING-MACHINES.

' Application filed May 10,

To all whom it may concern:

Be it known that I, J OHN W. KAUFMANN, acitizen of'the United States, and a resident ofBaltimore, in the State of Maryland, have invented certain new and useful Improvements in Reproducers 'for Talking- Machines, of which the followingis a specification.

Myfinvention is an improvement in re producers for talking machines, and has for its object to provide a new and improved connection between the needle and the diaphragm controlling lever, which will eliminatethe usual rigidity between these parts, substituting a resilient connection.

. In the drawings:

Figure 1 is a perspective View of the improved reproducer; I

Fig. 2 is a front view;

Fig. 3 is a vertical section;

V Fig. 4 is a'perspective view of the reproducer. case; 7

Fig. 5 is a'partial perspective view of a,

Figs. 6 and 7 are perspective views showing modified methods of clamping the springs to the case. r

In-the embodiment of the invention shown in Figs. 1 to 4, the case 1 of the reproducer box has the usual central nipple, 2

for receiving the inlet end 3 ofthe amplifier', and it will be noticed, referring toFig. 3, that the case has an inwardly extending annular rib tjagainst which the end of the amplifier abuts. V

The amplifier is held in the case by means of screws 5 having tapering points which engage tapering openings 6 in the amplifier, and it will be evident that when the screws are turned home the amplifier is drawn toward the rib to cause the same to fit tightly against the rib.

and at the point where it touches-the diaphragm. At diametrically opposite points the case 1 has extensions 10, and with each extension is connected a pair of bearing pins 11.

Specification of Letters I atent. Patented uly 27g, 1920- 1919. Serial No. 296,088.

- These pins, as shown," are connected with the case and have rounded outer ends whlch engage within tapering openings 12 in hold provided in the present instance. Thus the bars13 are pivoted on the pins 11, and it will be noticed that the said pins havetheir axes approximately in the plane of the diaphragm. The bars are freely movable onthepins and are pressed toward the pins by the resiliencyof the springs 14:. With one of these bars is connected the lever 15 which is connected'to the diaphragm at its center in the usual-manner. The other bar 13 carries a needle holder 17 of usual construction,

. carrying the needle 18 held in place in. the holder by the set screw 19.

The needle engages the record in the usual manner, and it vwill be evident that when'the needle is'moved by the waves of the record grooves this movement willpbe transmitted through the springs 14 to the other bar 13' and by way of the lever 15 to the diaphragm, vibrating the same in accordance with the contour of the grooves.

The bars 14: are preferably as shown in Fig. 2, each bar consisting of an inner and an -outer section, the sections having registering grooves for receiving the springs, and the sections may be secured together in anysuitable or desired manner. With this arrangementithe springs may be quickly and easily removed or re'placed,;when de sired, for any purpose, and eachspring is, firmly clasped by the bars.

In the embodiment of the invention shown in Fig. 6 the springs 20 are held in place on the bar 21 by a clamping plate 22 which is secured to the bars by screws 23 or the like. No grooves are provided in this arrangement, the springs being clasped directly between the clamping plate and the bar.

In the embodiment ofthe invention shown in Fig. 7 the springs 24 are received in openings through the bar 25, which is solid, and each spring is engaged by a set screw 26 threaded through the bar. The gasket 9 is held in place on the diaphragm by a ring 26 which is secured to the margin of the case. I

With the usual repr'oducer there is a rigid connection between the needle and the diasired.

phragm lever.j ,Inthe present construction. this connection is resilient, and a softer, less metallic reproduction is the result.

It will be understood that as many springs may be used asmaybe desired, as, form- Referring toFig. 3,,it will-be'noticedthat the sound box-is annularly groovedorzeoun conditions.

the connection of the lever, but it is obvious that they might be level with the lever or inreproducing lever connected withthe" diatersunk to receive the gasket 8. This brings the diaphragm"nearer to the face of the sound box.

The connection bars 13 maybe varied in accordance with Theyare shown as outside of side the same, if desired.

It will be evident from the description 7 that theusual stylus bar which connects the .needle with the diaphragm is replaced'by a two part construction, one of whieh,:13, supports the needle and the other of: which, 1516, isconnected to the diaphragm, and

that the said parts are'connected by the springs 14:. V I p I claim:

the sound box and the diaphragm, and the phragm, or bars arranged. at opposite sides of the reproducerbox and mounted to rock thereon, one of said bars being rigid with the reproducer lever and the other carrying shaped springs, each having one end con nected with one bar and'the otherwith the 7 other bar,

2. In reproducers, the combination with the sound boxandthe diaphragm, and the reproducing lever connected with'the diaof the springs with the phragm, of bars arranged at opposite sides of the reproducer box and mounted to rock thereon, one of said bars being rigid with the reproducerlever and the other carrying theneedle holder, and a connection between the said bars,said connection being resilient.

3. In reproducers, the combination with thesound box and the diaphragm, and'the reproducing lever connected with the diaphragm, of bars arranged at opposite sides of the reproducer box and mounted to rock" the sound box, the diaphragm, the. repro-. ducing lever connected therewith and the 65 needle holder, of a substantially U-shaped spring connecting the'needle holder with the.

reproducing lever.

5. In'a 'reproducer, the combination with the sound box, of a radial extension atone side thereof, a reproducing lever connected with the diaphragm at its inner end and pivotally mounted on the extension at its outer .end, a needle support pivoted'to the sound box opposite the pivotal connection of the lever, anda resilient connection between t r the pivotal connectionof the reproducer 1. In reproducers, the combination with lever and the needle support,;said connection comprising an arched springsecured at one end to the lever and at the other to the needle support. V

6. In: a reproducer, a sound box having extending radially therefrom an extension,

an arched spring having one end pivotally conneetedwith' thepextens'ion and the other end pivoted tothe opposite ;side of the sound box, a reproducing lever rigidlyconnected wlththe first named end of the spring at one end of the lever and with the dia- 1 phragm at the other, and a needle support rigidlyrconne'cted with'the spring' at the opposite end. 7

' 5 ITOH'NWVL KAUFMANN,

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