US2608657A

US2608657A - Television antenna

Info

Publication number: US2608657A
Application number: US155826A
Authority: US
Inventors: Spirt Milton; Goldman Jerome
Original assignee: SPIRT
Current assignee: SPIRT
Priority date: 1950-04-14
Filing date: 1950-04-14
Publication date: 1952-08-26
Anticipated expiration: 1969-08-26

Description

Aug. 26, 1952 M splRT ET AL 2,608,657

TELEVISION ANTENNA Filed April 14, 195o J' V E "muuu Patented Aug. 26, `1952 Milton VS'pirt and Jerome Goldman, 'lWewwYorlo4 N. Y.; said Goldman assignor to said Spirt Applicatioirhpril 14, 19m-saisine. 155,826: Y

2 claims. (ol. `25o- 333) 1 ,The invention herein disclosed relates to television antennae and the objects of the invention, generally, are to provide amore effective antenna for indoor use and one which can be tuned and adjusted to best suit local conditions under which a television set is operating,

, Specialobjects of the inventionareuto provide such an antenna in a relatively inexpensive "but at the same time, attractive, form suitable for use' in a room with the television set. l

Other important objects of the invention are to provide an antenna construction which will be readilyunderstandable by the average television operator and easily adjustable to obtain the best reception results.

Other desirable objects attained by the invention are set forth or will appear in the source of the following specication.

The drawing accompanying and forming part of the specification illustrates a present practical embodiment of the invention. Structure, however, may be modified and changed as regards the immediate illustration, all within the true intent and broad scope of the invention as hereinafter defined and claimed.

Fig. 1 in the drawing is a front elevation of one of the new antennae;

Fig. 2 is a broken horizontal cross sectional view of the same on substantially the plane of line 2 2 of Fig. l;

Fig. 3 is a broken vertical sectional view on substantially the plane of line 3--3 of Fig. 2;

Fig. 4 is a bottom plan view of the insulating base showing the connections inside the same after removal of the bottom plate;

Fig. 5 is a broken vertical sectional view on substantially the plane of line 5--5 of Fig. 2;

Fig. 6 is an enlarged sectional detail on substantially the plane of line 6-6 of Fig. 1.

The base of the device consists of a hollow cover portion 'I and a relatively heavy bottom plate 8 secured thereto by an upright through screw 9.

The latter also secures in place the upstanding pair of insulating plates I0, II, secured together in face-to-face relation by the through screws I2.

The hold-down screw 9 extends up between the insulating plates Ill, II, and has a cap nut I3 engaged on the upper end of the same, securing the pair of plates down on top of the hollow insulating base member 1.

The dipole arms or horns I4, I5, are pivotally and frictionally gripped between the upstanding plates I0, II, on the fastening screws I2 so that they `may be shifted and held in different angular positions. i

`Between the antenna arms is located an upstanding impedance wireloop 'l 6 extending down between the insulatingplates `IIJ,` II, and hav-,

ing the lower ends ofthe same, as `shown :in Fig.u4`, connected by tabs IT, I;8, with wires I 9, 20, which `serve as soldering terminals for the. paired conductorsJZI, $22, .which .are connected with the television set. i

An insulating washer 23 interposed'between the wiring tabs I'I, I8, and the metallic base plate 8, avoids the possibility of short circuiting the impedance loop.

The lower portion of the impedance loop is utilized to provide the connections to the antenna arms through the provision of tabs 24, Figs. 2 and 3, on the clamping screws I2 which at one end contact the lower ends of the arms and at the other end contact the Wire forming the loop IB.

To enable sharp tuning for fringe reception conditions and the like, a small tuning condenser 25 is located in the hollow insulating base 'I, directly connected as shown in Fig. 4, with the terminal wires I9, 20, and having an adjusting knob 26 on the top of the base.

The effective length of the impedance loop I6 is made variable, in the illustration, by an adjustable shorting bar consisting of a pair of metal straps 21 riveted together at `23 and clampingly engaged at opposite ends over the side Wires of the loop I6. This shorting bar may be readily slid up and down over the loop to effect best reception results.

The separate adjustments of the trimming condenser and loop shorting bar, together with angular adjustments of the dipole arms and rotation of the antenna as a whole, enable accurate and effective tuning for accomplishing reception under difficult or unusual conditions.

The dipole arms may be of constant length, as shown, or, if desired, these may be of telescopic construction, providing this additional feature of possible adjustment.

The complete device consists of but relatively few, sturdy and easily assembled parts and hence can be produced at low cost. The various adjustments disclosed provide for eiective reception under unusual or difficult conditions.

What is claimed is:

1. A television antenna comprising a supporting base having upstanding insulating plates in face-to-face relation, dipole arms having the inner ends of the same pivotally held between said upstanding base plates, an upstanding, in-

upstanding loop and whereby Said sarng screwsy secure said tabs in place and electrically connect the inner ends vof the dipole armswith ther sides of said upstandin'g loop. Y

2. A television antenna comprising a supportf ing base having upstanding insulating plates in face-to-face relation, dipole arms having the inner ends of the samepivotally held between said upstandingbase plates, an upstanding, inverted, U-shaped loop having the sides of. the same clamped between `said upstanding. .ibase plates in position. between the inner ends of the dipole arms,` screws extendingthrough saidbasel plates and through the inner. ends of said dipole.

arms, said screws clamping the two base plates together and. supporting lthe dipole arms in pivoted relation between the base plates `and tabs engaged on said screws between the base plates, saidtabs bearing against the inner, pivotally sup- 4 ported ends of the dipole arms and extending inwardly into engagement over the sides of the upstanding loop and whereby said same screws secure said tabs Vin place and electrically connect the inner ends of the dipole arms with the sides of said upstanding loop, wiring tabs on the lower ends of the sides of said loop, a trimming condenser and electrical connections extending from said. wiring tabs to saidtrirnmingcond'enser and thereby supporting said condenser from `and electrically connecting the same with said loop.

` M'ILTON SPIRT.

JEROME GOLDMAN.

REFERENCES CITED Y The following references are of record in the lerof this patent:

UNITED STATES PATENTS Number Name Date 2,117,416. Alfordv iv.l' f Oct.. .24, 1939 2,259,628` Feneret al. V `Qct..21, 1.941 2,521,798 Leonard V Sept.` 12, .195.0 V2,558,487- Hills June 26,195.13 2,582,634 v Jones Jan, 151952/V OTHER REFERENCES Radioy and 're1eyisi0n-Retailing,v Auges@ 19,49, page 24.

Radio and Televisien Retailing, september" 1949, page 87.