US1755820A

US1755820A - Loop aerial

Info

Publication number: US1755820A
Application number: US77568A
Authority: US
Inventors: Albert G Harms
Original assignee: Individual
Current assignee: Individual
Priority date: 1925-12-24
Filing date: 1925-12-24
Publication date: 1930-04-22
Anticipated expiration: 1947-04-22

Description

Apfil 22, 1930. A, G', HARMs 1,755,820

LOOP AERIAL Filed DeC. 24, 1925 40 ing means, and

Patented Apr. 22, i936@ Loor AERIAL Application filed vIDemamber 24, 1925. lSerial No. 77,568.

Y. This invention relates to a loop aerial or antenna for collecting radio or electric waves or energy, asfor a lradio broadcast receiver.

:Among the objects ofthe. invention are to y provide anovel winding and construction of inside or loop aerialV in the form of a complete enclosure or closed loop,l the-winding or coils of which are of continuous form with no largegaps throughout the surrounding sidesarea, or field, or which may be stated as havinggan'area about which the wires are wound to wholly enclose said area, which is smaller and more compact, as well as easier to manipulate than loop aerials heretofore produced, and which has `greater linductance than other loops of the same size and better directional effect. l K It is also an'ob] ect of the invention to provide a novel form of loop aerial which includes a frame of novel construction enclosed by a winding o n all sides, vthe frame being such that the winding. of the aerial is simplified and quantity production is facilitated.

Other objects and advantages will be ap- 25 parent as the description proceeds.

' In the accompaning drawings J Fig. `1 is a top plan view of my novel loop aerial. v d F ig.2 is a side elevation of the device.

Figs. 3 and 4 are transverse, horizontal, sectional yviews taken on the section lines 3-3 and 4 4 of Fig. 2 and looking in the directions indicated'fby the arrows.

Figs. 5, 6, 7,1and8 are kplan views' of modifications showing different geometrical shapes. I

Fig. 9 is a fragmentary detail elevation showing wire-mounting means for the coil.

Fig. 10 is a similar view of another mountnr Fig. llis a detail transverse, sectional view taken on the section line 11-11 of Fig. 10.

Referring to the drawings in detail, and

. especially ytoFigs. 1 to 4 inclusive, my novel 45 aerial is shown as comprising a frame including abase 12 havingfa soft covering 13V of cloth, felt, or rubber, yon the bottom Ato prevent noise .and marring o`r` scratching the surface of a table, console, or other cabinet or support upon which the device isusually re-V yposed when in use and to keep the base stationary. 1 f v Extending up from the center of the base 12 is a pivot pin or post 14, around which and mounted upon the base so as to be rigid there-v with, may be disposeda raised circular contact or bearing plate or disk 15 preferablyof `Bakelite or other insulation having a cen'- tral aperture receiving the post and a polished contact surface on which rests and turns a similar centrally apertured upper plateor disk 16. `The disk 16 is in turn rigidly secured to the bottom wire support or plate member 17 ofthe frame of the aerial as indicated by the screws 18, said member 17 being preferably of Bakelite or the like lThe frame also includes an upper wire support or plate member 19 moiuited on the upper ends of upright corner rods 20 which are rigidly connected to the top and bottom plates or frame members 17 andv 19 in any suitable manner as by means of screws 21 passingthrough the plates and intov the ends of the rods 20, thusv rigidly mounting said parts in parallel relation.

The winding or wire of the loop is desig- PAIEN OFFICE the wires arranged to extend in spaced relationship, or wound, wholly about the peripheries of the top and bottom plates andthroughout the sides or area of the same and embodies a series of coils.

One end of the wire is indicated at 23, at which point it is anchored t'o one of the plates or end members of the frame, preferably the bottom member'l 17, and extended through a corner opening, slot, or other wire-receiving, or guiding and retaining-means of a spaced series 24 extending entirely around the edges of the

plates

17 and 19, as indicated in the drawings and particularly in Figs. 1, 3, and 4.

The wire is then extended lengthwise of the frame to the upper member 19 through the corner opening` or wire-guiding means thereof, then diagonally across to the iirst opening on the adjacent side,r.then down through the corresponding opening in the bottom member 17, after which they operationV 'of winding is repeated, the coils extending Vcoil yor'windingis designated 25 and is preterably anchored beneath the bottom plate 17 at the corner diagonally opposite theVv corner where the end 23 is located, t iese ends being, adapted for connection with the receiving set and ground in the usual way. v l

An intermediate lead 26 is connected to one of the coils or loops of the winding22, inter-rv mediately thereof when it is not desired to employ the entire winding of theaeriall and less inductance is required. It also will-be notdfrom Figs. 2 and 3 of the drawings that the cent-ral loops of the Winding at the bottom are i preferably extended between the plate or Jframe member 17 and the disk 16 to' prevent interference with the bea-ring; surfaces.` Iii is'also preferable to provide an iupright'or bridge piece 27 on the upper #trame member or plate 19 extending from diago-v nally opposite corners vtransversely' or substantially at right angles to the eXtent'of the coils or loops of the Vwinding 22, so Athat the latterA will cross or intersect this bridge piece at right angles The bridge piece is preterably of'triangular shapev and is suitably securedy Vin'position vertically on the'plate 19 with its apex at 1the center-'andy has wire guides 28 in-theI form of openings, grooves, -or slots', orthe purpose of receiving the wires therein asthey are extendedy or bridged from one-'side oftheframe'to the-other'in the form ota pyramid at the top ot the-trame, thus giving greaterlength of coil with greater indu'ctance without materially increasing the size, as well as adding to' vthe attractiveness and appearance ofthe aerial.

Itiis tobe understood ythat the guide means 24:" may be v simpleopenings, slots, grooves, or other means, for receiving the wind-ing.' In Fig. 9 one ot the iframe members isfshotvn provided with openings 29 'having communieating slots-.30 preferably inclined to theedge of the frame member and providing an entranceopening into which the wire-may be readily passed 'without' the necessity7A of threading the entire length of "the wire through holes and thus facilitatino production. The slots arranged as shown', facilitate the entrance of the wires into the openings or guiding means and displacement-'of the wire Y is prevented, which is especially due to theinclined entrance portions resisting upward pull or any tendency to displace the wire out- Wa-rdly atright angles to the adjacent edge of the frame member Vand by reason of the overhang-ing portions 3l.

In Figs'. l() and ll of thek drawings, a differ VVent-guiding means is shown in which the rfam'einember is provided witlrnotches 32 rection-al actionzfas a .broadcast receiver, suitable means are provided, such as byengraving the lower Bakelite wire supp-ort 217,201? providing the saine 'with a compass as'` indicated-at 35; v In the event that-the Adirections' are indicatedK on the part '17, 4an iarrovv` or pin Btl-is inserted in or mounted on=the pivot' pin or post to co operatewiththefdirection narks' to fshow'v the f direction f l which :the loop is pointedx 'or t-helcompass may be mounted on the pin vas' showniatfl inFig. 2 ofthedrawingsgland `the' arrow .oi-ffpointerfpco-z operateswith the dial orldirection Lmarlsf; the pointer or needle 37-:be1ng 'of ther usual magnetic type :wheniemployed ineo'nnection withthe;compass.l Obviously I do? notdesire to be limi-tedx to f any particular: iconstruction ot direction' indicator,V and it isi also sobvi'oiis that the same may be arranged otherwise than on.- the-base, 'whether in'fth'e form of a compass or not;'= Y

In Figs; -5, '6,7,=and8 ofthe drawings, modificationsare shown plan. Theitram'e 39 in Fig. 5 -is shown. circulan with the: bridge piece 40' extending'ldiainetricallyg and .the winding 4.11 withl 'the coils thereof disposedfas chords. oit-an arc' with the/exception' ofthe :7;

end coils-whichare notarranged parallel to the others at* the top: and bottom but are arranged substantially as shown in l. In Fig.l 61 the trainee-22 is otelliptieahoroval shape in fplan 'with fthe -Jbridge'piiece .anand i:

the winding 44 arranged the samevrelation as 1n Figs. 1 andf'. In Fig.I 7 the iframe/45 is ot poly-sided form. andas shown hexagonal vin plain withla bridgefpiecelt extendinrgsubstantiarlly diana'etrically betweentwo angular portions or across between two opposite cor.- ners and the 1winding 1.71 is disposedy atright angles' thereto. i. In Fig' the frfaineilS' is oi' triangular form in plan; in wh'ichuthe bridge pie-Ce is designated at LI9 or may beom'itted entirely, while the y'winding is designated at 50. In any 'otthese` arrangements', the loops are'close together and', irrespectiveof the geometrical shape, Vthe aerial willaccommodate a greaterlength ofvvire than has been'pos; sible withother types of aerials, especially ,thosev having open sides or' fields.v For this reason, greater indu'ctance is 'possible than with other-loopsot the saine size,fowing to its being enclosed by a winding on-alfl sides-m.

While I have shown and described my invention in a preferred form, I amaware that various modifications and changes may be made therein Without departing from the principles of the invention, the scope of which is to be determined from the appended f v claims. n

I claim as my invention: r

1. A loop aerial comprising a frame including top and bottom members spaced apart a distance greater than anydimension of the members, means `connecting said members to each other, a bridge piece on one of said members, and Wires coiled around the frame and bridge piece'in engagementvvith` the members and bridge piece, said` Wires Wholly enclosing the area of theframe and having leads extending therefrom.

2. A loop aerial comprising a frame having top and bottom members spacedapart a distance Which is a multiple of any dimension of either of said members, connections between said plates forming uprights bracing the same,a bridge piece on the top member, and Wires coiled around the frame diagonally to progressively increase and decrease in size from a central point and detachably engaging the edges of the members and the bridge piece, the Wires being arranged to extend in equally spaced relationship to Wholly cover the area of the frame.

3. A loop aerial comprising a base having a pivot post, a frame comprising connected top and bottom members mounted to turn on the post, a bridge piece on the top member, said members and bridge piece having slots, a Winding comprising a continuous Wire removably mounted in said slots and forming coils progressively increasing in vsize from one side of the frame to an intermediate point and progressively decreasing in size from said intermediate point to the otherside to A form a substantially closed loop land field.

4. A loop aerial comprising a rotatable frame including top and bottom plates spaced apart a distance greater than any dimension 0f the plates, means connecting said plates to each other, a bridge piece on one of said (plates, and wires coiled about the frame and bridge piece angularly with respect to the edges of the plates and in engagement with the platesand bridge piece, said Wires Wholly enclosing the area of the frame and having leads extending therefrom. Y

ALBERT (t HARMS.