US1769256A - Radioreceiver - Google Patents

Description

July 1, 1930. A. sfcLARKr-z 1,769,256

RADIORECEIVER Filed March 24, 1927 2 Sheets-Sheet 1 E INVENTOR wlms Y A. 5 CZar/(e.

BY M WITNESS I Ads-Cl rk y 1930. A. s. CLARKE 1,769,256

RADIORECEIVER Fi led March '24, 1927 2 Sheets-Sheet 2 -Erma:

OUTPUT TERMINAES q 41 LQUD $PI:}:;R INVENTOR ATTORNEY}.

Patented July 1, 1930 n'LLENs. CLARKE, on DANVILLE, VIRGINIA ana I nn'monnonrvnn Application filed March' 24, 1927., Serial IiTo. 178,049.

This invention relates to a remote control for radio receivers.

The prime object of the invention is to provide means whereby the volume of the output of a radio receiver may be easily and accurately controlled from a point remote from the radio receiving set.

It is also an object of the invention that the volume control means be adapted to be employed in connection with any type of receiving apparatus without interfering with the operation thereofin reception of signals.

It is also within the scope of the invention that the volume control means be easy in operation and permit the user to utilize the same in giving vocal or instrumental music received the desired softness orloudness at any time.

In carrying out my invention I employ a suitable resistance which may be at a remote point to a radio set, suitable wires are extended from the resistance to the radio set so that the resistance may be connected in a circuit of the radio s-etwhereby the volume of the set may be controlled by the resistance.-

Thelinventlonvis illustratedby way of example in the accompanying drawings, in v I t 'which:

Figure 1 is a perspectiveview showing a radio receiving set with my invention applied, and

Figures 2 to 6 are diagrammatic views illustrating different Ways of applying my invention to a radio receiving system;

Referring to the drawings more particularly, and particularly to Figures 2and 4:, 10

indicates an antenna circuit which may be a coupled to the grid-filament circuit of a tube 11. At 12'is shown the primary winding of a radio frequency current coupling or transformer and at 18 the secondary of said coupling 12 is connectedin the plate circuit of the tube 11 in the usual manner, and the remainder of the, system for detecting the radio frequency currents and amplifying the same may be made in the usual manner. Inorder to control the volume of the receiving apparatus shown in Figure 2,

interpose in theplate circuit of the tube 11 a condenser. llandabout thecondenser I connect the wires 15 which are extended to a remote point, such as thechair of the operator ofthe radio receiving set, and the remote ends of ,wires15 connected to an" adjustable resistance 16.] The condenser 14 permits ,a by-pass for radio frequency curs rents, The res1stan'ce16 1s in series with the plate circuit of tube 11 and llh6 directh current of said circuit; must flow, through; 3

said resistance whereby the outputvolumee ofthe receiving set may. be controlled. In Figure 4, I- have illustratedan" adjust able resistance 17 locatedat a remote point,

wires- 18 which may constitute a Cable, lead; to a plug 19. Wires 20and121.arebXtendedg from the opposite ends oftransformer 13;, and'connected to a suitable jack'indicatedi at '22. The'transformervlififmay be eithertheaudio or radio frequency type-r As-is 1 apparent from the diagram the, resistance 17 can be connected aboutthe secondary of. the transformerfwin ding 113 and serveto" control the output volume of the systems:

Referringto Figure 1, 23 indicates a radio receiving ca'binet24, a loud, speaker,

and, 25a table; Assuming the system housed within {the cabinet 23 :is similarftothat-shown infFigure' 2 on-thab shown inp Figure 4, then thecable 26 would indicate: the cable for the wires leading to a suitably mounted resistance as indicated at 27;v As a is apparent, the resistance box or,circuit-,27,,

could be placed at .a dist'anceflvof the cabineti 28 is a part, and said resistancev 29 utilized for controlling the output of thereceiving 9 apparatus. Referring I an electron tube-which has connected in its; platecircuit the primary winding 81 of an 3 audio transformer, the secondary of said to Figures 6, indicates V a cable extending therefrom comprising the two wires 35 and said wires connected at their ends remote from the plug 34 to a suit-- nected to the output terminals ofthe receiving apparatus and the terminals of a high resistance potentiometer shown at 4:0. The wire 29 preferably has inserted therein a condenser ll. The one end of wire 39 may be connected to a terminal of a loud speaker and an output terminal of the receiving apparatus connected to the remaining terminal of the loud speaker. 7 serves to'stop flow of direct current through the loud speaker if such is inserted in circuit of secondary 32 and the potentiometer 40 serves to control volume of loud speaker connected as previously pointed out.

While I have shown various ways by which my invention may be practiced it is to be understood that I am aware of the fact that a suitable resistance might be utilized in other circuits of a radio receiving apparatus with equal results, as for example, a resistance might be inserted in the filament circuit of one or more tubes of a set and the volume of the set controlled by regulating the brilliancy at which-the filaments are burned.

I claim a 1. The combination with a radio receiving apparatus, of an addedswitchjack arranged in the out-put circuit ofthe apparatus, a length ofconductor cable, a'rheostat connected in circuit with certain of the conductors of said cable toward the outer end thereof, a condenser connected in circuit with one of the conductors of said cable and said rheostat,"and a plug connected to the conductors of the cable at the opposite end thereof and adapted to be engaged with said switch jack whereby the volume of tone reproduction at a loud speaker in the said out-put circuit may be varied at will by manipulation'o'f said rheostat from a point remote from the said apparatus. 7

2. The combination wtih a radio receiving apparatus, of an added switch jack arranged in the output circuit of the apparatus, a casing separate fromsaid apparatus, a length of three wire conductor cable leading from said apparatus to said casing, a

variable resistance mounted in said casing The condenser 4:1

and having the resistor element thereof connected across the free ends of two of the conductors of said cable, a condenser also mounted within said casing and connected in circuit with the other of said conductors of said cable andto the movable element of lation of the movable element of said rheostat.

ALLEN CLARKE.

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