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Dec. 15,v 1936. y - ` - E. F. ANDREWS RADIO CABLE l 2,064,513 ` Filed March 9, 1931 m ' 2 Sheets-Sheet 1 Dec. 15, 1936. E. F, ANDREWS v 2,064,513 RADIO CABLE Filed March 9, 1951 2 Sheets-Sheet 2. Patented Dec. 15, 1936 2,064,513 UNITED STATES PATENT OFFICE 2,064,513 RADIO CABLE Edward F. Andrews, Chicago, Ill. Application March 9, 1931, Serial No. 521,157 16 Claims. (Cl. Z50-16) This invention relates to multiple cables com prising a plurality of electric conductors in sulated from each other, and particularly to such cables which are suitable for use with radio 5' receiving sets. One of the objects of the invention is to pro vide an improved multiple cable. A further object of the invention is to provide an improved multiple cable of generally flat form which may readily be concealed by iioor cover ings and the like. A further object of the invention is to pro vide an improved multiple cable which is of generally iiat form and which can be readily secured in desired position without endanger ing the conductors or the insulation thereof. A further object of the invention is to provide a cable having an outer envelope and means as sociated therewith for maintaining the conduc tors and the like in desired position. A further object of the invention is to pro vide a cable in which one or more conductors are located with respect to the others to mini mize objectionable capacity effects therebetween. 25 A further object of the invention is to pro vide a multiple cable in which a certain con ductor is effectively shielded from another con Figure l is an elevational view, partly in sec tion, showing a radio receiving set and cable embodying the invention: Fig. 2 is a sectional plan view taken on the line 2-2 of Fig. 1; 5 Fig. 3 is a plan detail view of a fragment of the cable, the outer envelope being partly broken away to disclose the insulated conductors and other elements; Fig. 4 is a sectional detail view taken on the 10 line 4-4 of Fig. 3; Fig. 5 is a similar View of a modified form of cable; Fig. 6 is an enlarged sectional view of the irn proved cable plug; Fig. 7 is a perspective view showing a modified form of cable which is readily detachable from the radio set; Fig. 8 is a perspective detail showing the male plug element mounted on the set; and Fig. 9 is a perspective view showing the modi ñed form of cable connected to the set. Referring to the drawings, the cable I0 corn prises an outer envelope I I which encloses a plu~ rality of insulated conductors I2, I3, I4, and I5 and a suitable number of spacers or fillers I6. The conductors I2, I3, I4 and I5 may suitably tachable means at one end for connection to a be rubber coated stranded copper Wires and the spacers or ñllers I6 may suitably be cotton cords of approximately the same size as the insulated conductors so that said conductors source of power, antenna and ground, and at the other end detachable means for connection Fig. 4 to provide a cable of generally iiat or ductor. A further object of the invention is to provide 30 an improved radio receiving set cable having de to the radio set. . and spacers may be laid in a row as shown in tape-like form. The envelope II may suitably A further object of the invention is to provide be woven around the conductors and iillers and a portable radio receiving set and a plurality of radio cables whereby the set may be readily con nected to and disconnected from a source of power, antenna and ground in a plurality of 40 locations. its opposite faces may be connected by threads I‘I which pass between adjacent conductors and A further object of the invention is to provide a cable and radio receiving set cabinet provided with means for stowing an excess length of 45 ñllers, preserving the desired arrangement of manner so as to produce an envelope II having a desired elongative design Woven into it. connecting means. vide a single filler of suitable width so as to pro A further object of the invention is to provide Other objects, advantages and capabilities of the invention will appear from the following description of preferred embodiments of the in~ vention, taken in conjunction with the accom 5 panying drawings, in which 5 the enclosed elements and the general fiat form of the cable. The threads I'I may be posi tioned during the weaving operation or during a subsequent independent operation. The weav ing operation may be conducted in any suitable cable therein. A further object of the invention is to provide a radio receiving set cable having an improved an improved connecting plug for a radio receiv 50 ing set cable. 0 Instead of the plurality of ñllers I6 I may pro vide effective spacing between the conductor I5 and the other conductors I2, I3 and I4. The conductor I5 is normally the antenna conductor, the conductor I4 may, for example, be the ground conductor, While the conductors I2 and I3 may be the alternating current conductors which are supplied with energy from the power lines. It will readily be seen from the drawings that 55 "2,064,51á 2 it is preferred to space the antenna conductor I5 fashion. As illustrated, the chamber 29 is only as far as possible from the other conductors. This is done to reduce as far as possible the capacity slightly wider than the cable and is suitably lo cated in the base of the cabinet, the slot 3D being vertical. It will be understood however that this method of stowing cable is capable of other em bodiments, since the flat cable lends itself to easy stowage without risk of tangling. It is to be noted that with this method of stow ing the spacing between the antenna and the other conductors is preserved. Adjacent the inner end 10 the cable I0 is secured to one of the side walls of the chamber 29, which may readily be done since between the antenna and the other conductors and to reduce the signal power loss resulting therefrom. Another advantage of this spacing is the reduction of the possibility of the antenna picking up a hum or other electrical disturbances from the power lines. The energy loss is a func tion of the frequency and owing to the high fre quency of the radio oscillations in the antenna the signal strength loss is frequently considerable. Another objectionable effect of the capacity be tween the antenna and the other conductors is that it tends to put the ñrst tuned circuit out of step with the other circuits, which impairs the efiiciency of the operation of set. screws, tacks or the like may be passed through the iillers I6 without danger to the conductors or their insulation. The inner end of the cable IIJ 15 passes upwardly from the chamber 29 and its various conductors are connected to the receiv In order to obtain the full benefit of the in vention, the material of which the ñllers I6 are ing set. In the modification shown in Figs. '7, 8, and 9 made should be of low speciñc inductive capacity. the cable Ill is provided with a plug I9 which is 20 connected to the power outlet 2 I, ground lead 21, and antenna lead 24, in the manner described above. The other or free end is provided with a plug element 32 which comprises sockets 33 which I have found cotton string to be suitable since it introduces a relatively small amount of solid mat ter between the antenna and the other conduc tors, 'the main dielectric being air. ïn the modiñcation shown in Fig. 5 the ground conductor it is omitted, or is replaced by a ñller i@ and ground connection is made by means of a shield ES of conductive material formed on the exterior of the insulated conductors I2 and i3. 30 The shield i2 may suitably be constituted of woven metal, although any other form of con ducting coatine may be employed. The free end of the cable i0 is connected to a plug i9, which may suitably comprise the prongs 29 adapted to cooperate with a conventional power outlet iii. The conductors I2 and I3 are connected to the prongs 2D in the usual manner. The plug Sti comprises a socket 22 which is con nected to the antenna conductor I5, the socket 40 22 being adapted to receive a plug 23 of midget type, whereby the antenna lead 24 may suitably be connected to the receiving set. The plug i!! also comprises a socket 25 to which the ground conductor i4 of the cable is connected. The socket 25 is adapted to receive a plug 26 of are connected to the conductors I2, I3, I4 and I5. 25 The radio receiving set 28 has mounted thereon a corresponding plug element 34 adapted to re ceive the plug element 32. With a portable radio receiving set 28 which is to be used in several locations, a plurality of cables ID may be em rug or the like until it is desired to use the in strument in that location again. Such cables, provided in the locations in which it is desired to operate the instrument enables a modern receiv ing set to be employed as a portable instrument 40 with much greater convenience than has hereto fore been possible. This modiñcation of the in vention is particularly adapted for situations where, as is usually the case, the wall outlets are obscured by pieces of furniture and the like. This 45 midget type, which is connected to a ground lead modiñcation enables the cables to be more or less 27. lt will thus be seen that I have provided an extremely simple means whereby the radio set 50 may be connected to any suitable outlet. The plug le is merely inserted in any suitable outlet and the antenna and ground leads are plugged into the plug I9. The plug I5 may be formed integrally by a molding operation or other suitable way, the body being formed of suitable insulating ma terial. This body is provided with a slot through which the end of the cable IG is passed. This end may be anchored to the plug by suitable 60 means, for example a bolt 3| which passes through the plug body and through the cable I0 in the central portion in which the ñllers I6 are located. If desired, as shown in Fig. 6, the body of the plug i9 may be made in two parts secured together by permanently installed and concealed by floor cov erings and the like. In such installation the cable may be held in secured position by tacks or the like which extend through the central por tion of the cable and, passing through the fillers I6, do not injure the conductors or their insula tion. When the cable thus secured is uncovered, the tacks employed are preferably provided with ornamental heads. Although the invention has been described in connection with the specific details of preferred embodiments thereof, it must be understood that the bolt 3|. The generally ilat form of the cable I0 enables me to stow a certain amount of the cable very conveniently in the radio cabinet so that no ex cess lengths or convolutions of the cable need be exposed. In Figs. l and 2, I have shown a receiv ing set 28, in which I provide a chamber 29, into which opens a slot 30 through which the cable passes. 1t will readily be understood from Fig. 2 that when the cable is forced inwardly through the slot 30 the cable will arrange itself in zig-zag 30 ployed which are readily connected and discon nected at the set. Used in this way the ground lead 21 and antenna lead 24 are left permanently connected to the plug I9 and the cable I0, owing to its generally flat form, may be concealed by a 35 such details are not intended to be limitative of the invention except insofar as set forth in the 60 accompanying claims. What I claim as new and desire to secure by Letters Patent is: l. A radio cable of generally flat form com prising a group of conductors including current 65 conductors and a ground conductor in adjacent relation, a separate antenna conductor, and a, spacer maintaining the antenna conductor in spaced relation to the said group of conductors, all of said conductors and said spacer being ar 70 ranged in a plane. 2. A radio cable of generally flat form com prising current conductors, a ground conductor, an antenna conductor, and a spacer maintaining the antenna conductor in spaced relation to the 75 3 2,064,513 other conductors, 'said conductors and spacer 10. In combination, a radio receiving set' cabi being arranged in a plane, and the ground con ductor being located between the current con ductors and the spacer. 3. A radio conductor of generally flat form comprising insulated current conductors, an in sulated ground conductor, an insulated antenna conductor, and a plurality of spacers of low spe net comprising a chamber of horizontal plan, one of the side walls being provided with a ver >tical slot, a radio cable of generally flat form secured within the cabinet at a point remote from the slot and extending through the slot, ciñc inductive capacity and having substantially chamber it arranges itself in zigzag formation. 11. A radio cable of generally ñat form com 10 prising an outer envelope, current conductors, a ground conductor and an antenna conductor lo cated therewithin and arranged in a plane, the current conductors and ground conductor being 10 the same dimensions as the conductors, said con ductors and spacers being arranged along side each other with the spacers between the antenna and other conductors. 4. A radio cable comprising current conductors 15 located adjacent each »other provided with con ductive shields a-dapted to be grounded, an an tenna conductor, and means spacing said an tenna conductor from the current conductors a greater distance than that between adjacent cur 20 rent conductors. 5. A radio cable of generally flat form com prising current conductors, metallic shields thereon adapted to be grounded, an antenna con ductor, and a spacer maintaining the antenna 25 conductor in spaced relation to the current conductors, said conductors and spacer being a1’ ranged in a plane. 6. A radio cable of generally ilat form com prising insulated current conductors, metallic 30 shields thereon adapted to be grounded, an ín sulated antenna, a plurality of spacers of low speciñc inductive capacity of substantially the same dimensions as the conductors, said con said chamber being substantially rectangular in shape so that when the cable ís forced into the: arranged as adjacent members of a group and 15 the antenna conductor being located in substan tially spaced and parallel relation thereto. ' 12. A radio cable of generally flat ribbon-like form comprising current conductors and an an tenna conductor, and means spacing said an tenna conductor from the current conductors a greater distance than that between adjacent cur~ rent conductors. ` 13. A flat radio cable comprising a conductor and a shielded conductor in closely spaced re 25 lation and a third conductor on the side of said shielded conductor remote from the first said conductor and spaced from the shielded con ductor a greater distance than the distance be tween said shielded conductor and the ñrst said 30 conductor. 14. In combination, a radio receiver unit, a flat cable connected to said unit and a plug se spacers so as to maintain the cable in generally cured to the end of said cable, said cable in cluding a pair of adjacent alternating current 35 conductors and an antenna conductor spaced from the alternating current conductors greater than the spacing between said alternating cur rent conductors, and said plug carrying ele ments for connecting antenna and power leads 40 to said conductors. 15. A radio cable of generally flat form corn prising an outer envelope, current conductors flat form, the antenna conductor being separated and an antenna conductor located therewithin ductors and spacers being arranged along side each other with the spacers between the antenna and other conductors. 7. A radio cable comprising current conductors, a groun-d conductor, an antenna conductor, spacers of low specific inductive capacity, en 40 closed within a fabric envelope, and threads eX~ tending from one side of the envelope to the other and between adjacent conductors and 45 from the other conductors by the spacers. 8. In combination, a radio cable of generally flat form comprising current conductors, an an tenna conductor and a ground conductor, an-d a plug into which said cable is adapted to enter, said plug being provided with prongs adapted to enter a standard lighting outlet to which prongs the current leads are connected, and be ing provided with connection elements in its ex posed portion to which the antenna and ground conductors are connected. and arranged in a plane, the current conductors 45 being arranged as adjacent members of a group and the antenna conductor being located in sub stantially spaced and parallel relation thereto. 16. In combination, a radio receiving unit, a ñat cable connected to said unit and a plug se 50 cured to the end of said cable, said cable in cluding a pair of adjacent alternating current conductors and an antenna conductor spaced from the alternating current conductors greater than the spacing between said alternating cur 55 conductors of a radio cable, sockets in the eX rent conductors, a pair of contacts on said plug adapted to enter a standard outlet to connect said alternating current conductors to power supply, and a connecting element on a portion posed portion of the plug for receiving antenna and ground plugs, said sockets being adapted to to said outlet for connecting an antenna to said 9. A radio cable plug comprising prongs for cooperating with a standard lighting outlet, means for connecting said prongs to the current be connected to the antenna and ground con ductors of a radio cable. of said plug exposed when the plug is applied 60 antenna conductor. EDWARD F. ANDREWS.