US1525559A - Electrical coil - Google Patents

Description

F b, 10, 1 925. v N. E. LZNDENBLAD ELECTRICAL COIL- Filed Dec. 27, 1921 S Sheets-$h9at 1 gn uawtoz N1 L5 E. LINDENBLAD $3M; M5 Gum/M4 9 2 W Feb. 10. 5925.

" N. E. LINDENELAD ELECTRICAL COIL Filed Dec. 1921 if Sheets-Shem v v E, IJNDENBLAD 2% his fi m W MW F sh; 10, 1925.

N.E.UNDENBLAD ELECTRICAL COIL Sheets-Sheet 5 Filed D90. 27, 1921 gvmemtoz NaLs E. UNDENBLAD his flbtoz/me' 0 8g); 3 my Patented Feb. ill, i925.

uni'rr. STATES PATENT Fries.

NILE E. LZNDENBLflD, O3? BRUOKLYN. NEW YGR-K, ASSIGHQR TO RADEO GbRPOB-ATION ATEEERICA, CQRPEBRA IZON OF DELAWARE.

ELECTRICAL QQIL.

Application filedfiecember 27. Serial 1V0. 5525,2350.

To all 2071 am it may cancer-n:

Be it known that l, NILS'E. Linux-Binnie, a citizen of Sweden, and a resident of the boroughof Brooklyn, Kings County, 1; York, have invented certain new and use- -tul Improvements in Electrical Coils, of which the following is a'specification accon'r panied by drawings.

This invention relates to high frequency inductance coils and similar apparatus. In wireles telegraphy inductance coils are used for loading the antenna and tuning or balancingyarious circuits connected therewith. These coils are not wound in compact relation, like low frequency coils, but are made up of a plurality of spaced turns of wire such as Litzendra/ht or other suitable wire or cable. It has been customary to wind the cable on porcelain rods spaced apart in such a way that a drum shape coil is produced. There are several disadvantages of such a type of inductance, chief among which are the dificulty of repairing the coil it a porcelain rod becomes broken and the liability of breaking down the insulation of the porcelain rod by the high potential, which nec cssarily is applied directly to the supporting rods. Furthermore, the number of turns in a coil of this kind cannot be readily increased it occasion demands as the porcelain rods are usually made no longer than necessary to support the number of turns of wire as first arranged.

It is the object of my invention to overcome these and other diiliculties in high frequency inductance coils and the manner in whcli this is accomplished will be explained in the following-specification, reference being had to the drawings in which: i

Fig. 1 is an elevation of one of the train of insulators supporting" the coil.

Fig. 2 is a perspective View of the inductance coil.

Fig. 3 is a perspective clone of the insulators and sdgacent parts. Fig. l is an enlarged side view of a portion of the train of insulators shown in Fig. 1. Fig. 5 is a cross section on the line 5-5 of Fig. l.

Referring to Fig. 1 of the drawing, the cable supports are made up of a plurality of porcelain or similar insulators 1' in the form of across as shown more clearl in Fig. 3. Metallic plates 2 insulated 031 each other by the porcelain suppe secured between adjacent insula means of ll bolts 3 and located at angles to each other and extending in op site directions which pass through dingo holes in theporcelain as shown in Figs. l and The'plates are clamped in position between the insulators by means of nuts on the ends of bolts so taat a substantially rigid train of insu is produced and these may be ad to maize any desired length. Any numbero .-=.y be arranged above each other the drawing I have shown only two. two of trains are secured at one end to rel which in turn is connected to a supporting post 6. The other end of the series is connected to a similar rod 7. -lo hold the st of insulators in spaced relation 1' n'nty pose spacing insulators 8 and 9, shown. Vl henevcr these insulator connections are added the plates, such as 11, may be bent at right angles so that the U bolts of adjacent horizontal insulators 1 may be clamped to one end and the U bolts of the insulators 8 may be clamped to the other end. insulators 8, and the U bolts u d therewith, may be of the same form as t shown in 3.

In Fig. 2 the insulator trains A A, B B etc. are made up of individual insulators and plates as shown in Fig. 1. The preferred manner of winding the cables on the in sulators is as follows: I

Starting at 12 the cable is clai'nped against the first plate 2 as shown more clearly in Figs. 1 and. i. it is then clamped to the 90 first plates in B, C, l)", E and F in succession. If an insulating covering is around the cable it is preferably removed at the point Where it is clamped to the plates 2 so as t place the plate at the same potential as the cable at that point. After one turn is completed the cable then passes to the first lower plate of A. The cable is then clamped in succession to the first plates of each of the other lower insulators B. C, etc. until the plate in train F is reached. The cable then passes to the second plate in the upper insulator A and thence to all of the second plates in the other upper series. After the second turn is made the cable ex- 106 tends to the second series in the train 1%.:

B, etc, and anot I turn, is made 1 MES v Q Int '5 way the turns arealternately made at; the top and-bottom and-extend inwardly stepby-"step'until the last turn 16 is made.

"""lo this last turn is connected the second terminal 17 kit will be understood that all the cables are clamped to the plates located-f between "the "insulators andlpreferably good metallic 'contact existsbetween the cables and-plates. By connectingth'e terminal 17 to the high potential end of the antenna, or .other art of the system with which it is therefore may be looped under the turns of the coil and connected to the antenna or other part of the system without high-potential insulatorsas no strain is placed on this terminal other'thaii its own weight.

It will befseenfrom the construction chosen that the insulators are broken u .into. a. plurality of short insulators with aconductin'g plates'between; Therefore, the

potential is distributed at spacedpoints throughout theinsulator train. This means that each insulator is required to stand only the potential of two turns of the coil and liability ofthe insulator breaking down is reduced to-a minimum. If the insulator consisted'of a unitary insulator rod. with the cables clampedin s aced relation to it it would bel more difficult to obtain an equal sential.

voltage distribution. For this reason the prior construction consisting of vertical porcelain rods has a limit of length beyond which it is impractical to go. With my construction the coil may be made of as many turns or layers as desired. j The insulators 1 can be continually addedto the trains with interspersed plates teeny lengtln desired and no breakdown points will be reached becausev n the embodiment shown each insulator has to stand the voltage of two turns only.

The shapes of theinsulators 2' are not material as any form may be'used. I pro for however the star shaped insulator shown in Fig. 3 as it isa standard form of insulator of moderate price. The articular arrangement of coil shown in ig. 2 is hexagonal in shape but this of course is not -es-. This was given by way of example only and any con u'ation may be used.

gt Also additional trains and insulators may be added so as to support more than two layersin the coil, that is, each post 5, 7

may have three or more trains. clamped thereto. i

If desired, the opposite metal rods 7 may endinsulatom. a

be-secumtogether. b cables such as indicated at 18, particular y while the cables are being strung but these may be left in place afterwards, aethe-rods are insulated by the Having, described my inventiontwhat 1 claim is: I

1. In an electrical coil, .a series of separate insulators haying conducting members therehetween. and means for; fastening said 7 coil to said conducti v members.

2. In electrical co a series of separate 7 insulators'smured together with 00Ddl10% H members therebetween and having tum the coil fastened to said'memhers.

3. In electrical coils, a. plurality of acedturns, a plurality of separate insu ators having conducting members disposed therebetween and each of said members supporting a turn or" said coil. 35

d. in an electrical coil, a plurality of conducting turns and a plurality of separate insulators having conducting members disposed therebetween and connected to different turns of said coil.

5. In an electrical coil, a plurality of conducting turns, and a plurality of spaced trains composed-of separate insulators each having conducting members disposed between said insulators and connected to different turns ofsaicl coil for supporting the turns at a plurality of points in the circumference. I

6.111 on electrical coil, :1. pluralit of sep-' arate conductin turns in substantially the same lane,,a plurality of sup orts located at di erent points in the rip cry of said coil, said supports comprising a lurality of insulators with conducting mem rs disposed therebetween and connected to the turns of said coil.

' 7; In an electrical inductance, a plurality of fiat coils, a support for each of said coils,

each of said supports comprising a plurality of trams of separate insulators at difierent points in the periphery of said coils, the

insulators of said trams having conducting members disposed thercbetwecn and 'connected to the turns of the coils.

8. In an electrical coil, aninsulator be tween the turns of said coil having a. conducting member attached to each of its op posite sides 9. In an electrical coil, an insulator be-' tween the turns of the coil, said insulator having-two holes through the center, conducting memliers atopposite sides of the insulator and a pair of U shaped bolts pass: ixigshrough'eai holes and fastened to said p a a a 10. In an electrical jcoil, an insulator between the turns of the coil, saidinsulator having two holes at right angles to each other through the center, conductin plates at opposite sides of the insulator an a pair of ogglositely extendi U bolts fossil throng plates. 7

11. In iui elecirical coil, a trainof insuiators each having holes and adepte to support and insul'at the turns of a coll conducting plates between said insulators and U bolts extenaiing throughsaid holes in said insulatols'and fastened to the plwtes said holes an fastened em for connecfiing said :lnsuletors and plates 'intoatrain.

12. In an electrical coil, 0 'irain oI insumg holes and adapted to support and msulete the turns of a coil, conducting plates between said insulatols, extening through oppositely inclined diagcnal holes in said insulators and fitting in the grooves formed by the extending portions 03. said insulators for connecting the plaes and insulators to form as mechanically connected train.

NILS E. LINDENBLAD.

lators of star-shaped cross section each havand a pair of U bolts

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