US1774068A - Static eliminator - Google Patents

Description

w. A. SELLER STATIC ELIMINATQR Filed Jul 1, 59

Aug. 26, 1930.

(HIM &

I'NVENTOR Patented Aug. 26, 1930 I UNITED STATES WILLIAM: A. SELLER, or nnennrrnn, iurssounr srnrric summin Application filed .Tuly i, 1'92a Serial no. 371L976...

i 1o invention consists in certain novel'and useful features of construction and organization of parts'as hereinafter described and claimed; and in order that it may be fully understood reference is to be had to the accompanying drawing which represents certain parts in diagram and other parts in central vertical section.

In the said drawing, where like reference characters identify corresponding parts in all ofthe figures, A represents a multiple aerial comprising five parallel wires, the two outside wires identified as 1 being connected at one end, the two wires 2 adjacent the outside wires 1 being also connected together as illustrated, while the center wire 3 is not connected. to any ofthe other Wires comprising the aerial. B indicates four single pole double throw. switches. 1

. Encircled by the dotted line C is any stand- 1 ard radio receiving circuit and necessary apparatus illustrated as being equipped with a suitable loud speaker 5"having terminal's 6 and 7. The aerial lead connection for the radio circuit is indicated at Sand the ground 35. connection at 9. I

10 indicates three iron plates and inserted between said plates but protected from contact therewith by silk cloth inserts ll are-the legs of a U shaped metal conductor 12 having itsends forming terminals 13 and 14, the pile I of platesbeing secured together in any suitable manner and being subjected to th e mag netic field of a permanent,horseshoe'magr 1 fourth switch is connected a wire, 43 to a net 15. V

wardly or toward the coils by a bowedspring metal plate 20 having a cent'ral opening 20 phragm 19, as indicated.

said coils is connected by a 'wire 39 directly to 16 and 17 indicate 5 electromagnetic coils mounted on the legs of the urshaped magnet The tension of the bowed plate 20 may be alteredat willby operation of athreaded cap 21;engaging'the housi'ng21 to, regulate the pressure against'the'diaphragm 19as will be readily understood.

The mechanism above described is connected asfollows: Aerial wires 1 -1, 22 and 3 are respectively connected to the terminals 22, 23 and'24; of'the switches B, the fourth switch terminal 25 being connectedby a wire 26 tothe ground terminal 9 of the receiving set. r i

,The upper four terminals 27 of the switches are connected by awire 28 tothe magnet "15 said wire 28 being tapped-bye. wire 29 leading'to one termina'l of an adjustable resistance 30, the other terminal of said resistance being connected by wire 81 to an adjustable inductance 82, the other terminal offthe inductancebeing connected by a wire 33 to the magnet '18; 3

The lowerterminals 3.4L of the first'three switches are connected by a wire 35 leading. to terminal 13 of element 12, the other terminal 14 of said element being connected by a wire 36 to they aerial terminal 8 of the radio receiver. Tapped off the wire 35 is a wire-'37 having its end soldered or otherwise per-v manently secured to the center of the dia-.'

vThe electromagnetic coils 16 and 17 are connected inseries by a wire 38,. and one, of

one terminal 6 of the loud speaker 5, while the other 0011 17 is connected by wire 39 to, one, terminal of an adjustable inductance 40, the other terminal of said inductance being connected by a wire 41 to the second termina 7 of the loud speaker circuit.

Tapped off the wire 28 to the upper switch terminals is a wire 42 which is connected to a.

jpermanentground for the eliminator equip ment. The lower switch terminal of the second permanent ground. 3 a From a consideration. of the above it willbe. evident that with all of the switches in their upper positions all of the aerialsythe eliminatorapparatus and the radio receiving circuit are connected by the wire 42 to the w i round. It will also be apparent that by seective operation of said switches any aerial or combination of aerials may be used for the reception of radio signals, but that in every case the signal must pass through the pile of plates 10-12.

It will be understood that the inductance 40 must be adjusted to accommodate the particular type of speaker 5 employed in the receiving circuit, and that resistance 30 and inductance 32 are adjusted to suit particular conditions in the grounding of the interference.

The inventor at this time is unable to ex- I I 3 plain justwhat occurs in'the mechanism and circuits shown, but his experimentation has proven that the vconstruction is effective in eliminating extraneous atmospheric and similar electrical noises from the radio receiving circuit.

I claim:

The combination witha radio receiving set and an aerial therefor, of a static eliminator element inserted in series between said set and aerial comprising a metal plate, a magnet so arranged as to affect said eliminator element, a reproducing unit forming a part of the radio circuit, an electromagnet in parallel with said reproducing unit, a diaphragm 30 adapted to be affected by said electromagnet, a connection from the eliminator element to said diaphragm, and a ground connection for said first-named magnet and the coreoi said electromagnet. i

Intestimony whereof I aflix my signature.

WILLIAM A. SELLER.

CERTiFICATE or CORRECTION.

.Patent No. 1,774,068. Granted August 26, 1930, to

WILLIAM A. SELLER.

It is hereby certified that error appears in the above numbered patent requiring correction as follows: In the grant, and in the heading to the printed specification, the residence of the patentee should read 'fArgentine, Kansas" in- .stead of Argentine, Missouri; and that thesaid Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.-

Signed and sealed this 21st day of October, A. D. 1930.

. M. J. Moore, (Seal) Acting Commissioner of Patents.

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