US1881391A - Remote control for radioreceivers - Google Patents

Description

Oct? 1932- B. WASHINGTON-ET AL 1,881,391

REMOTE CONTROL FOR RADIORECEIVERS Filed June 15, 1927 Patented Oct. 4, 1932 sTTEs ."BOWIDEN WASHINGTON, OF NEW YORK, AND WILSON .A'ULL, JR., OF .ASTORIA; NEW YORK, ASSIGNORS TO REMOTROLE CORPORATION, A CORPORATION OF NEW YORK REMOTE CONTROL FOR RADIOREGEIVERS Application filed June 13, 1927. Serial No. 198,470.

One object of our invention is to provide a simple and easy manner of turning on and off the filaments of a radio receiver from the loud speaker no matter where the latter may be located, and without causing a drop of filament voltage at the vacuum tubes which would be the case if the filament current was caused to flow through long extension wires .p

of small cross section.

Another object is to be able to control from a point near the loud speaker the volume of the sound produced withoutspoiling the quality.

It is becoming more and more usual to use extension cords sometimes of considerable length in which case the listener hasto go to the receiver to turn off the filaments. A particular instance of this may be given to show its usefulness in the broadcasting of morning exercises. In this case the radio receiver would normally be placed in the living room, while the user might desire to take exercises in his own room or on a porch immediately upon arising. By means of our invention he could before retiring tune to the station which normally transmits the material for the morning exercises and bring the loud speaker to the exercisingplace. Upon arising at the predetermined hour he would light the filaments of his receiver from or at the loud speaker, thus putting the set into operation and upon finishing the exercises turn off the filaments without the necessity of going downstairs or into another room where the receiver is located.

The drawing shows one form of our invention applied to a radio receiver having direct audio frequency out-put.

Referring to the drawing the plate 5 of the last audio frequency amplifier tube 6 of the set is connected in the usual manner to one wire of the extension cord 7 terminating in a plug socket or jack 8. The speaker 9 by its cord 10 is connected to the usual plug 11.

' The positive terminal of the B power pp y such as battery 12 is connected in the usual manner to one conductor of the cord 7.

The relay 13 is of low resistance and may be of the delay type in order to have a time response factor suited to the desired sefilaments. It is connected in series with the.

Abattery 1a and the filaments. It is normalvly held in the closed position by thespring 15. The relay 16 is of comparatively higher resistance and may be operated by the direct current'componentof the loud speaker. in-

ut., It isnormally held open ,by the spring 17. The resistance 18 is preferably of the general order of value of the plate filament impedance ofthetube'- 6. In orderto control the volume preferably without aifectingthe plate'voltage we may provide a transformer 19 in-theloud speaker circuit with a voltage :divider or potentiometer 20 across ,the sec- .ondary so arranged that any :desired fractiona1part of the voltagemay berdelivered -to thelloud speaker 9 or the current to the speakervmay be. turned off.

:Inoperation when the plug 11 is inserted Einto the jack Scurrentfrom the B battery 12 goes through the loudspeaker and-back through the resistance 18,1through the con- :tacts ;of' the relay 13 i and through the wind ings of the relay 16 back tothe battery, thus .energizingthe magnet ofthe relay 16.,and closing its contacts. When this closure is -eifected,-the filaments are heated but it Will be seen that in series with these filaments is ;the low resistance relay 13 which becomes s:

The plug and jack serve as a switch to interrupt and or close the loud speaker circuit.

Suitable by-pass condensers (not shown) may be employed in parallel with any or all of the relays or resistances used in order to reduce signal loss therein, as well known in the art.

Household wiring and piping systems may be utilized in whole or in part for the extension conductors 7 The transformer, potentiometer and plug switch may be sold and mounted as a single unit either for insertion between the receiver and the speaker or to be connected by an extension cord to the speaker base.

It should be understood that other modifications may be made within the broad scope of our invention. tails of the radio receiver and the type of loud speaker are immaterial.

We claim: 7

1. In a vacuum tube radio receiver having a loud speaker, the combination of a switch in the loud speaker circuit, a relay having a coil in the plate circuit and having a switch member in the filament circuit, the current in the plate circuit being normally sufficientto hold the filament circuit closed, a relay having a coil in the filament circuit and a switch in an auxiliary plate circuit and a substantially constant impedance Volume control deriving its energy input from the conductors supplying the first mentioned switch in the loud speaker circuit.-

2. A vacuum tube radio receiver having an A battery, a B battery and a loud speaker, a relay connected to the A battery, a switch and volume control of substantially constant impedance located at the loud speaker, said switch, volume control and loud speaker being connected to the radio receiver by a a single pair of conductors and circuit connections for closing the B battery circuitand automatically operating the relay and lighting the filaments when said switch is closed including a switch and anoperating coil in the filament circuit.

3. A radio receiver combination adapted for distant control including a radio receiver having electronic tubes, a source of cathode heating potential and a source of anode potential furnishingv energy thereto, a shunt circuit from the cathode source to the anode source, a lighting relay with its operating coil in the anode circuit and its contacts closing the filament circuit, and a cut-ofi relay with its operating coil in the filament circuit and its contacts opening said shunt circuit so that normal space current flow is established upon its operation.

BOWDEN WASHINGTON. WILSON AULL, JR.

Obviously the de-

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