US1703080A - Coil mounting - Google Patents

Description

G. L, BEERS con, MOUNTING Filed Jan 2' 1926 :WIIINUNN Feb. 19, 1929' mvENTOR fylm wlTNEsSESI d f l ATTORNEY G. L. BEERS con. MOUNTING Feb. '19, 1929.

Filed Jan. 2, 1926 2 sheets-sheen E RB O. T/ Ne wi my E 6 wlTNEssEs:

AT'ONY Patented Feb. 19, 1929.

UNITED STATES4 PATENT OFFICE.

GEORGE Il. BERRE, l' WILKINSBUBG, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELEUIBIC MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

COIL MOUNTING.

Application led January 2, 1926'. Serial No. 78,792.

My invention relates to the mounting of inductances such asl are used in radio receiving or transmitting systems and has particular reference to the mounting of such coils when they are to be used in small places.

The principal object of my invention is to devise methods of and means for, mounting a plurality of inductances in close relation whereby the inductive coupling therebetween will be held at a minimum.

A further object of my invention is to provide means whereby the relative positions of such inductances may be changed and,

A still further object of my invention is f to provide an inductance mounting which will be easy to assemble and which will hold the inductance firmly in position.

It has been found, when building a radio receiving or transmitting set, that very often undesired couplings exist between the component inductances, which is an obvious disadvantage. It has also been found necessary in the construction of portable receiving sets to place coils belonging to different circuits in rather close relation. This, of course, re-

sults in undesired inductive coupling between the coils.

It is old and well known that coils may be connected astatically so that the outside field is reduced to a minimum. With these conditions in mind, I have designed a mounting whereby an astatic coil in, for example, the plate circuit of one tube ma be placed rather close to a coil which might be in the grid circuit of the same tube or in the grid or plate circuit of another tube and, at the same time, I am enabled to avoid undesired cou ling between these two sets of inductance. '1lb accomplish this result I so locate an astatie inductance composed of two sections, with reference to a single inductance, that the inductive effect of each half of the astatic inductance on the. single inductance is neutralized.

I have also devised a method of mounting the various inductances involved in this system in such manner that they will at all times be firml held in position, will not be subject to de ormation, and may be easily assembled. I accomplish these results by em loying inductances of the spider-web or baset-wound type and attaching them flat against an insulating support, using as an attaching means a continuous strand of cord or analogous material.

For a more complete understanding of my 1nven tion, reference is made to the accompanying drawings forming a part of this specification in which,

Figure 1 is a plan view of a preferred form of my astatic system;

Fig. 2 is a cross section of the same on the line II-II;

Fig. 3 is a detail View of the astatic inductance assembly;

y Fig. 4 is a back view of the assembly showing the manner in which the inductances are attached to the support.

In Fig. 1, inductances 1 and 2 are positioned astatically. In other words these inductances are both wound in the same direction and the outer ends are connected together at 3. fl'hese inductances are firmly secured to an insulating support 4 by means of a iiliform element 5 which is more clearly shown in Figs. 3 and 4. The second inductance 6 is positioned below the first inductance assembly as shown in Fig. 2 and is spaced therefrom by means of a spacer 7.

The second inductance 6 is also secured to a support 8 by a cord or other element analogous to that by which coils 1 and 2 arc held on the support 4. The support 8 is provided with a. central opening 9 through which passes the bolt 10 carrying the spacer 7. The aperture 9 is made considerably larger than necessary to pass the bolt l0 and on either side thereof are placed washers 11, which as sembly permits a relative adjustment of supports 4 and 8.

Referring to Fig. 3, the support 4, of insulating material, 1s provided with a plurali t of holes 12 in addition to the central hole.

hrough these holes is passed the cord 5,

which secures the inductances firmly against the insulating support.

In Fig. 4, which 1s a back view of the support 4, is more clearly brought out the manner in which a single continuous cord is used to hold the two inductances against the suport. P It will be noted that when a current in any given direction passes throu h inductance 1, a magnetic field is set up w iich is opposite in sense to that set up by inductance 2, which is connected astatically to inductance 1. The voltage inducted in inductance 6 by inductance 1 is, therefore, opposite in direction to that induced by inductance 2. To secure a perfect balance, it is usually necessary to shift the position of inductances 1 and 2 along an axis of inductance 6 or perhaps along a chord of inductance 6. This adjustment is provided for by the assembly shown in Fig. 2 in which, by loosening the nut 13 the pressure on washers 11 is released and the upper support 4 is permitted to be adjusted to the desired position.`

Referring more particularly to the manner of securing the coils on the support, in Fig. 3 it will be noted that the continuous cord does not pass over the inductance but is threaded through the space left by the winding forni peg, enabling this cord to be drawn as tightly as desired, and knotted as shown in Fig. 4.

The entire assembly may be dipped, if dedcsired, into an insulating and moisture resistantvaruish or the like, or the coils may, of coui'se, be so treated before mounting. It is obvious that in lieu of the single continuous cord 5 a plurality of separate lengths of cord may be used without departing from the spirit of my invention. It is also obvious that the holes 12 in the insulating plate 4 may be replaced by protuberances around which the cord may be placed.

By this method of :istatically positioning three coils, I am enabled to build a receiving set or other radio apparatus having much smaller physical dimensions than when the usual type of inductances are employed. I am also enabled by my invention to quickly position these inductances on their mountings, and to obtain at much less expense than usual, an assembly which is quite durable, compact, and readily replaceable as a unit.

Although I have illustrated and described a single specific embodiment of my invention, certain obvious changes falling within the range of wel] known equivalents will suggest themselves to those skilled in the art. Accordingly, I do not desire to be limited eX- cept as required by the prior art and as indicated in the accompanying claims.

I claim as my invention:

l. An inductor assembly for radio-receiving apparatus, comprisin 'a plurality of astatically-connected spira ly-Wound coils, a second spirally-wound coil, means for supporting said astatically-connected coils in a plane substantially (parallel to the plane of said second coil, an means pern'iitting limited lateral motion of said coils in their respective planes, whereby their mutual inductance may be reduced to the lowest value consistent with the vertical distance between the said planes.

2. In combination, two astatically-connected inductors of the spidea-web type lying substantially in the saine plane with their perimeters closely adjacent, a planar insulating support, filiform means for holding said inductors against said support, a single inductor of the spider-web type having a diameter commensurate with the combined diameters of the two first vmentioned coils, and means for positioning the second coil in a plane substantially parallel to the plane in which lie the first mentioned coils and adj acent thereto.

3. In combination, two astatically-connected inductors of the spider-web type, means for supporting said coils in a single plane with their perimeters adjacent to each other, a single inductor of the spider-web type, and adj ustable means for movably positioning the second inductor in a plane parallel to the plane in which lie the first mentioned inductors and adjacent thereto, whereby the coupling between said first mentioned coils and the single coil may be adjusted to minimum value.

In testimony whereof, I have hereunto subscribed my name this first day of December,

GEORGE L. BEERS.

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