US1508726A - Radiophonograph - Google Patents

Description

Sept. 16 1924.

l. SHAPIRO RADIOPHONOGRAPH Filed May 39 1923 iii its

is; a

ISRAEL SHAPIBQ, F DENVER, COLOMBO.

IOPEONOGH.

application filed my 29,

To all whom it may cmwem:

Be it known that l, ISRAEL SHAPIRO, a citizen of Lithuania, and resident of the cit and county of Denver, State of Colora 0, have invented certain new and useful Improvements in Radiophonographs; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and usethe same, reference bein had to the accompanying drawings, whic form a part of this specification.

The object of this invention is to provide a compact combined radio and phonograph outfit, which preferably may be housed in a structure whlch will also serve as a desk or table.

The invention resides in a cabinet having compartments containing a phonograph and a radio receiving outfit, a common horn being provided therefor, whereby sound may be transmitted from either the phonograph or the radio set. Preferably, the cabinet has a flat top so that the device may also serve as a desk or table, a rtion of said top being hind if desire for access to said honograp and radio set. The phonograph also includes an improved sound box or transmitter provided with the usual diaphragm having a needle arm, an auxiliary diaphra and a dead air chamber behind the auxi iary dia hragm, the space between the diaphragms eing connected with the horn. This construction of transmitter softens the tone and reduces the usual scratching and rasping.

In the accompanyin drawings wherein certain embodiments o the invention are disclosed by way of illustration,

1 is a plan view taken from line 11 of Fig. 2;

Fig. 2 is chiefly an elevation taken from lines 22 of Figs. 1 and 3;

Fig. 3 is an end view taken from line 33 of Fig. 2;

F. 4 is a section taken on line 4-4 of the e 5--5 of 4 Fig. 6 is a cross proved e tom of the intion as shown comprises a cabinet in e is of a table hava t top 19 one snot which constitues 1%.. The de Of 3 1923. Serial No. 642,325.

table on the front side may have a drawer D and in the rear thereof a compartment is provided to receive an electric battery B for aradio outfit R. One end of the table has a compartment 16 for the storage of phonograph records 18 accessible by reason of doors 20 in the end of the table.

At the other end on the front side the table has a compartment 22 to contain a radio set R, the top of which may be reached by lifting the cover 12, the front thereof which carries the panel 23 and dials 24 being reached b opening a door 25 on the front of the table. A connection 26 leading from the aerial may pass through the bottom of the compartment.

A partition 28 separates the compartment 22 from a rear compartment 30 the lower part of which contains a born 32 of one of the types used with phonographs, the large end of the horn terminating at a lattice or grating or the like 33 at the end of the table or cabinet. Above the horn 32 there is placed a shelf or partition which may be removable, said shelf or partition 34 having a phonograph motor M suspended therefrom for driving and supporting a record-supporting table 35. Said shelf 34 also supports a pivoted tone arm 36 of any known or preferred construction which carries at its free end a transmitter or reproducer 38. Between the lower end of tone arm 36 and the small end of the horn 32 a connection 40 is provided for conduction of sound waves from the reproducer 38 to the large end of the horn.

Connection 40 on said small and of horn 32 also has a union or fitting 42 for attachment of an amplifier 44 having electrical connections 45 with the radio set R in the compartment 22 and with the battery B or other battery as desired. Thus sound waves from the set R- and the amplifier 44 are transmitted from the born 32 forming a socalled loud speaker.

Thus, when the phonograph is being used, sound waves reproduced by the transmitter 38 will be broadcasted from the horn 32, and when the radio set and amplifier 44 are in operation sound waves therefrom will also be broadcasted from the horn 32. Access to the upper parts of the phonograph and radio set may be had by lifting the cover 12, and access to the panel 23 and dials 24 of the radio set R maybe had by 0 ening door 25. en the cover 12 is lowere the whole top of the cabinet serves as a table and the general appearance is that of a library table.

Aispecial feature of the invention resides in the transmitter or reproducer 38, Fig. 6, which is provided with the usual diaphragm 50 having connection with the conventional pivoted needle arm 52 mounted on the ring 54 which carries the diaphragm 50. A second or auxiliary diaphragm 55 is spaced from the first diaphragm 50 and is secured between the housing 38 of the reproducer and the ring 54, screws 55' or the like being employed to retain the parts and a gasket 56 being provided between the diaphragms. Within the housing 38 and behind the second diaphragm 55 a dead air chamber 58 is thus provided, a gasket 62 being placed between diaphragm 55 and the end of the hub 60 which projects into the housing. The outer end of said hub serves as means for mounting the device on the tone arm 36. A flange 64 on a connection 65 threaded into hub 60 engages the outer face of diaphragm 55, and after the parts are secured together the connection is threaded deeper into hub 60 by a special tool or the like to cause flange 64 to force diaphragm 55 against gasket 62 and thereby tension said diaphragm 55. Preferably said vdiaphragm 55 is a thin metal part, which when tensioned as stated acts somewhat as a drum head on said dead air chamber. As a result vibrations imparted to diaphragm 55 from diaphragm 50 are cushioned upon the dead air body in chamber 58, thereby eliminating harshness and scratching and wonderfully softening and purifying the tone.

I claim:

In a sound amplifying device, in combination, a tone arm, a horn having a large end and a small end, a connection between said tone arm and the small end of the horn, a mechanical reproducer connected to the tone arm, and an electrical receiver, adapted to be operated by an electric current from a radio amplifier, connected with said connection whereby sound is transmitted from said horn, both from the tone arm and from the electric receiver.

In testimony whereof I aflix my signature.

ISRAEL SHAPIRO.

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