US1745118A - Sound-reproducing device - Google Patents

Description

Jan. 28 193m.

E. S. PRIDHAM ET AL SOUND REPRODUCING DEVICE med June 14. 1922 -2 Sheets-Sheet l In enters Edwin SJrid/uzm Peter L. Jbnsen y fliiornegrs Jan. 28,- 1930 E. s. PRIDHAM ET AL scum) REPRODUCING DEVICE Filed June 14 1922 2" Sheets-Sheet 2 Elnreziors Ed win .SZPr

fliior l a l I I l I I l I l l I I l I Ieter .J 9 L ens n la egrs Patented Jan. 28, 1930 UNITED STATES PATENT OFFICE EDWIN S. PBIISHAM AND PETER L. JENSEN, OF OAKLAND, CALIFORNIA, ASSIGNORS TO THE MAGNAVOX 00., OF OAKLAND, CALIFORNIA, A CORPORATION OF ARIZONA SOUND-REPRODUCING DEVICE Application filed June 14,

This invention relates to sound reproducing devices, and has for its object to combine 1n a single instrument a phonograph and an electrical sound reproducer with means for optionally placing one or the other into communication with a horn whereby sound waves may be reproduced either electrically or acoustically.

The device includes an electrical sound amplifier which is so arranged that it may be used in connection with the phonograph and at other times can be hooked up with a radioreceiving set to reproduce the sounds in greatly amplified tone. 1 y

One form which our invention may assume is exemplified in the following description and illustrated in the accompanying drawings, in which- Fig. 1 shows a diagram of anapparatu embodying our invention.

Fig. 2 shows a front view of a phonograph cabinet within which the mechanism is arranged. y

In its present form, the device comprises a horn 10, which is preferably arranged within a cabinet 11. This horn has a branch conduit 12 extending to a swinging tone arm 13 which carries a phonograph reproducer 14. Anotherbranch conduit 15 extends to an electro-dynamic telephone receiver 16. Preferably, this receiver is of the type shown and described in our rior application, Serial No. 377,354, being nown commercially as a Magnavox. Between the branch conduits 12 and 15 is a valve .17, pivoted at 18 and adapted to be moved to permit one branch to be put into communication with the horn, while shuttin oil the other branch. The electro-dynamid receiver is adapted to be hooked up to a radio-receiving set, as shown at K in dotted lines in Fig. 2.

The phonogra h reproducer 14 is shown as co-operating .wit a sound record 19 carried on a turn-table 20 for ordinary phonographic playing. In addition to the reproducer 14 we show a combined phonograph reproducer and transmitter 21 carried by a swinging support 22 and having electrical connections with the electro-dynamic receiver 16 such that the sounds from the phonograph record 1922. Serial No. 568,309.

may be transmitted through the electro-dynamic receiver and sent out through the I by wires 24 and 25 with a movable coil 26 on the electro-dynamic receiver. This coil is fixed to the diaphragm 27 of the receiver. Points 0 and D are connected by wires 28 and '29 with an electro-magnet 30 of the said receiver. Terminals E and F are connected by wires 31 and 32 with the radio-receiving set K, and terminals G and H are connected by wires 33 and 34 with the battery of the radioreceiving set. When the switch is thrown to engage the terminals E, F, G and H the telephone currents from the radio-receiving set pass through the electro-dynamic receiver where they are amplified and sent out through the branch conduit 15 and horn 10.

Terminals K and L are connected by wires 35 and 36 with the combined reproducer andtransmitter 21. In the last-named circuit we show a battery 37 and a rheost-at 38. The other terminals I and J are connected by wires 39 and 40 with the wires 35 and 36 and include a condenser 41. When the switch is thrown to contact with the terminals I, J, K and L; the sounds from the combined reproducer and transmitter are transmitted telephonically to the electro-dynamic receiver 16 and sent out in amplified tone through the branch conduit 15 and horn 10.

In addition to the electrical reproduction and amplification of the phono raphic sounds, the phonograph may be playe in the ordinary way through the reproducer 14 and branch conduit 12.

Preferably the entire mechanism above described is housed in a single cabinet which is also designed to contain the radio-receiving set and its batteries.

Various changes in the construction and arrangement of the several parts herein shown and described may be employed without departing from the spirit of our invention as disclosed in the appended claims.

Having thus described our invention, what we claim and desire to secure by Letters Patcut is;

1. In a sound reproducing device, the combination with a sound record, a combined phonographic reproducer and transmitter cooperating with the sound record, an electrically operated telephone receiver, a radio receiver set, electrical connections between the telephone receiver and the transmitter aforesaid, electrical connections between the telephone receiver and the radio-receiving set, and a switch for controlling said connections whereby to connect the receiver with the phonograph or with the radio-receiving set at the option of the operator.

2. In a sound reproducing device, the combination with a sound record a phonographic reproducer co-operating therewith, a combined sound reproducer and transmitter also co-operating with said record, an electro-dynamic receiver, a horn having a branch conduit connected to the first-mentioned sound reproducer and a second branch conduit con nected with the electro-dynamic receiver,

' means to place either branch conduit into communication with the horn while closing the other and electrical connections between the combined reproducer and transmitter and the electro-dynamic receiver whereby the sound waves from the. phonograph may be transmitted through the electro-dynamic receiver for electrical reproduction or through the first-mentioned reproducer for acoustical reproduction.

3. In a sound reproducing device, the combination with a sound record, a phonographic reproducer co-operating therewith, a combined sound reproducer and transmitter also co-operating with said record, an electro-dynamic receiver, a horn having a branch conduit connected to the first-mentioned sound reproducer and a second branch conduit conor with the radio-receiving set at the option of the operator.

4. In a sound reproducing device, the com-

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