US1978053A - Radioreceiver and resistance cord - Google Patents

Description

Oct. 23, 1934. g T MASON ET AL 1,978,053

RADIOREGEIVER AND RESISTANCE CORD Filad Feb. 13, 1935 2 Sheets-Sheet 1 L I Q 9 CarL mada Oct. 23, 1934-. c MASQN r AL 1,978,053

RAISIORECEIVER AND RESISTANCE CORD Filed Feb. '15, 1955 2 Sheets-Sheet 2 Jiadw Becewer m0 Baal/6r desirable,

Patented Oct. 23, 1934 1,91s,c5s nsnroascarvaa AND RESISTANCE'CO Carl T. Mason and Byron B. Minnium, Chicago, IlL, assignors to Stewart-Warner Corporation, Chicago, 111., a corporation of Virginia Application February 13, 1933, Serial No. 356,438 2. Claims. (Cl. 250-27) This invention relates toa new and improved electrical conductor .cord or the like, and more particularly to a multiple conductor including both high and low resistance units.

5 With various types of devices to be Operated from regular commercial electric current lines,

it is desirable or necessary to reduce the voltage between the line and the device being operated. Examples of such devices are radio sets and motion picture projectors. With many such devices it is customary to locate the resistance within the set or under or .upon the mounting of the projector. The usual types of resistances are bulky and must be provided with ventilation to dissipate 5 the heat generated during the use of the resistance. Both of these difficulties are particularly objectionable in connection with certain types of small radio sets which have been developed for use upon commercial current .lines whether digo rect or alternating current.

We tion in relation to such a radio set but it is to be understood that it is adapted for a wide variety of other uses where a resistance is necessary or such as in connection with motion picture projectors, small motors, therapeutic lamps or other devices. a

It is an object of the present invention to proyide a new and improved electrical conductor 39 cord or the like including a high resistance element.

It is also an object to provide a multiple con-' ductor including both low and high resistance conducting elements.

'It is an additional object to provide a multiple conductor including low and high resistance units connected in parallel.

It is a further object to provide a miultiple'conductor of the-type described in which the high and low resistance elements are insulated from each other both electrically and thermally.

' It is also an object to provide a multiple conductor adapted for use with difierent voltages of supply current and adapted for adjustment in accordance with such voltage.

Other and further objects description proceeds.

We have shown in the accompanying drawings certain preferred embodiments oi. our invention. Figure 1 is a diagrammatic showing oi a radio circuit with our improved conductor in association therewith;'

Figures 2, 3, 4 and 5 are \views similar to Figure 1, with the radio receiver merely indicated in the will appear as the have illustrated and described our invenfigures and with modified forms of conductor shown diagramatically; j

Figure-6 is a section on an enlarged scale taken on line 66 of Figure 2;

Figure '7 is an enlarged section 7-7 of Figure 3;

Figure 8 is a view similar to Figure 2, but showing a modified form of conductor;

Figure 9 is a section on line 9-9 01 Figure 8; and i I i r 5 Figure 10 is a view similar to Figure 8 but showing a further modification;

Referring first to Figure l, the radio circuit is shown in schematic form including the radio frequency amplifying tube 11, the detector tube 12 and audio amplifying tube 13. The rectifier tube is shown at 14. Themultiple conductor 15 is shownfas provided with a usual type of ,twoprong plug 16 having. rongs 17 and 18 adapted for insertion in any usual type of receptacle. The prong 17 is connected to the low resistance conductor 19, which conductor is connected to the electrode 20 in the rectifier tube 14.

The low resistance conductor 21 is connected to prong 18 and in the set is connected through line 22 to line 23 which, through line 24, is connected to the filament or heater element 25 in the detector tube 12.. This element 25 in tube. 12 is connected by wire 26 to the similar element 2'? in tube 11. Element 27 is connected by the wire 28 to the similar element 29 in tube 13 The other side of the element 29 is connected through wire 30 to the element 31 in the rectifier tube 14.

taken on line 60 The other side of element 31 is connected by wire 32 to the high resistance conductor 33 in the multiple conductor 15. This high resistance conductor 33 is connected in; parallel in the conductor 15 to the low resistance conductor 19 a at a point adjacent the plug 16.

It will be understood that the'hig-h resistance conductor 33 may be of any desired length and extend through any part of the multiple conductor 15, depending upon the resistance of the wire use in conductor. 33, the length of the multiple conductor, and the amount of resistance it is desired to insert in the line.

With four tubes of the type shown in use in radio sets at the prese'nttime, and with the filaments connected in series, the resistance in the conductor 33 should be approximately 280 ohms, with a volt source of current. It will'be understood that the showing of Figure ,1 is schemat-. lo and that the invention is adapted for use with other types of radio circuits in which tubesmay be connected in series or in parallel as desired, deno pending upon the tube characteristics and the voltage of the line. It will also be understood two low resistance conductors, the proper voltage drop may be provided between the electrodes in the rectifier tube as well assupplying the filament current for all of the tubes, which latter our- 7 rent is passed in series through the high resistance conductor. In Figure 1 the three conductor elements have been shown schematically as carried in parallel through the multiple conducton. This form of construction may be used or the forms of construction shown in Figures 2 and 3,

which merely differ as to the relation to the three conducting elements.

- eludes-the low resistance conductors 51 and 52 provided with the insulating sheaths 53 and 54.

. In'Figure 2 the low resistance conductors 40 and 41 are shown twisted with thehigh resistance conductor 42. This multiple conductor is shown in section on an enlarged scale in Figure 6. The low resistance conductors 40 and 41 are shown as provided with insulating casings or sheaths 43 and 44. These casings or sheaths may be formed of, fabric and rubber, or any other usual insulating material. The high resistance conductor 42 is shown as consisting of a spiral coil which is wrapped spirally around a core 45- and is enclosed in a sheath 46'. This-sheath 46 in addition to beingan electrical insulator is also preferably provided with one or more layers of asbestos or other The three conductors The form of construction shown in Figure 3 in These conductors 51 and 52 are carried parallel and spirally wrapped around them is a high resistance conductor 55; The conductor 55 is in turn enclosed in an asbestos sheath '56 with an outer fabric covering 57.

The forms of construction shown in Figures 4 and 5 diiier from those previously described in that the high resistance conductonextends only part way through the'length of themultiple conductor. In the tube shown in Figure 4, the insulating housing 61 encloses the low resistanceconductors 62 and 63 and the high resistance conductor 64. These conductors are. connected to usual types of wires or other flexible low resistance conductors 65, 66 and 67 respectively, these wires leadingito the radio receiver. The sheath 61 may be of greater or less longitudinal extent and may be directly incorporated in a plug structurehaving the prongs 68 and 69 for the usual type of connector. The housing 61 may be'both thermally and electrically insulated and if desired my be flexible in character. I s In the form of construction shown in Figure 5,

the plug 71- is provided with prongs '12 and 73- which connect to wires 74 and 75. The wire- 75 connects in the sheath or housing 76 to the high resistance conductor 77 and the low resistance conductor 78. The wire 74 connects in the hou's ing 76 to the low resistance conductor 79. In this case the housing or sheath is located immediate- Lv adjacent the radio receiver rather than adjacent the plug. Where the extension of such a housing adjacent the receiver is not objection able, this construction-has the advantage over that in Figure 4 in that only twoconductor wires are necessary between the housing and the plug. In the form of constructionshown in Figure 8,-

the proper voltage to the receiver.

there is provided an adjustably connected plug '81 which includes the section 82 provided with nected to prong 83 in all of the three adjusted positions of the plug.

With the parts in the intermediate position. shown in Figure 8, the contact connected to the wire 87 is aligned and in contact with the contact connected to prong 84. The contact 91 would be permanently connected to the low resistance wire 86, and contact 92 connected to the higher resistance wire 88. The multiple conductor has been shown connected to a radio receiver 93. Whilean adjustable multiple conductor of this character is adapted for use with a variety of current-using devices, it has been shown in connection with the radio receiver and voltages V 1 of 6, 32 and 110 have been indicated on the plug section 81-. For example, where the source of voltage connected through prongs 83 and 84 is a storage battery or other device delivering six, volts, the two low resistance conductors 85 and 86 may be connected. Ifthe voltage delivered is 32 volts, as for example from what are commonly called farm lighting systems, the resistance of the line 87 may be adequate taken in connection with the low resistance conductor 85 to deliver For use with a 110 volt source of current the high resistance 88 may be connected in association with the low resistance conductor 85.

The form of construction shown in Figure 10 offers a possibility of delivering a multiplicity of I voltages to a radio receiver or any other device from a source 01 current having asingle voltage. The plug 101 is shown as having the prong 102 which is connected to a low resistance wire 103 and a high resistance wire 104. The prong ,105 is shown connected to a low resistance wire 106,- a high resistance wire 107, and a higher resistance wire 108. All wires lead to the radio receiver 109; It will be apparent that cross connections may be made in thereceiver in a variety oil-ways between the several conductors which vary in resistance. For example, a cross connection be-v tween conductor 104 and conductor 108 would give a low voltage. A connection between conductor 104 and conductor 107 would g'ive'a higher voltage. A connection between conductor 104 a connection between conductors 103 and'106' would deliver to the receiver or other device, substantially the full voltage of the power line. It -will be apparent, therefore, that a multiple conductor of this character is adapted to deliver a multiplicity of voltages and thus eliminate the necessity for numerous resistors which are com-X monly used in radio receivers.

While the drawings have shown several types of construction it will be understod that our invention is capable of either change or modification to meet varying conditions and requirements. Also, as has been previously stated, it

a radio receiver.

ducting elements being connected in series with said vacuum tube, the high resistance element to the filament of said tube and the low resistance element to another electrode in said tube.

-2. In combination with a radio receiving set having a receiving vacuum tube and a rectifying vacuum tube as parts thereof, a multiple electrical conductor external to trically connected between said set and a high potential source of current,'a pair of low resistance conducting elements and a. high resistance conducting element in said conductor, the high resistance element and one low resistance element being connected in series with the filaments oi the receiving and rectifying tubes, and the other low resistance element being connected in parallel with the high resistance element and to an electrode in the rectiiying tube. 1

- CARL T. MASON.

BYRON B.-

said radio setand elec-'

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