US1853649A

US1853649A - Protective casing for electric coils

Info

Publication number: US1853649A
Application number: US348752A
Authority: US
Inventors: Charles M Winkelman
Original assignee: Belden Manufacturing Co
Current assignee: Belden Manufacturing Co
Priority date: 1929-03-21
Filing date: 1929-03-21
Publication date: 1932-04-12
Anticipated expiration: 1949-04-12

Description

C April 12, 1932.

C. M. WINKELMAN PROTECTIVE CASI'NG FOR ELECTRIC COILS Filed March 21, 1929 Patented Apr. 12, 1932 UNITED STATES PATENT OFFICE CHARLES M. WINKELMAN, OF CHICAGO, ILLINOIS, ASSIGNOR T BELDEN :MANUFACTUR- ING COMPANY, 0F CHICAGO, ILLINOIS, A CORPCRATION OF ILLINOIS IPRO'IEC'IIVE CASING FOR ELECTRIC COILS Application filed March 21, 1929. Serial No. 348,752.

f toprovide a protective casing of simple construction which can be manufactured cheaply and economically; to provide a protective casing of comparatively lightweight and of a minimum thickness: to provide a casing lo which can be quickly and easily assembled and permanently secured in place around an electric coil winding; to provide improved means for connecting the coil in the desired electric circuit; and in general, it is the object of my invention to provide an improved protecting casing` for an electric coil winding.

Other objects and advantages of the invention will be understood by reference to the following specification and accompanying drawings in which l have illustrated an electric coil enclosed in a casing embodying a preferred form of my invention.

- In the drawings: j

Fig. l. is an end elevation.l

Fig. 2 is a section on the line 2-2 of Fig. 1;' and Fig. 3 is a v'iew similar to Fig. 2 but on a smaller scale and showing the' parts of my improved casing separated as they may appear before being assembled around the coil.

Referring now lustrated an electric ont embodiment is a winding of a small gauge, enamel covered, copper wire. The winding may be madein any approved manner and may be bound by strips of tape 6 which serve to prevent unravelling or unwinding of the coil. It will, of course,'be understood that the coil is wound on a mandrel or the like so that the coil is provided with a central opening when the same is removed from the mandrel. The strips '6 of tape are placed on the mandrel when the winding of the coil is started so that the coil is wound thereover and when the winding is completed,v free ends of the tape are brought upwardly across the sides or ends of the winding and inwardly across the face thereof into overlapping relation substantially as shown in Fig. 2. The coil is, of

to the drawings, I have ilu coil 5, which inthe pres! course. wound between suitable flanges which are removably mounted on the mandrel so that when the winding operation is completed, the flanges may be removed and the tape manipulated as above described. Preferably. the coil is wound around a layer of suitable insulation indicated at 7, which may be of paper and which is placed on the mandrel before the coil is wound.

A sleeve or tube 8 of insulating material is inserted into 'the center opening of the coil, the tube being of such length that end portions thereof project from the ends of the coil as indicated in broken lines in Fig. 2. The tube S in the present instance, is formed of a suitable grade of paper, and preferably a very heavy grade of cardboard which is impregnated with wax or a Wax-like composition which serves to stitfen the tube.

The above described tube constitutes an inner casing or covering part since it serves to cover the inside surface of the coil. For covering the ends and outer periphery of the coil, l provide a drum formed of a sleeve or tubular casing 9 and end closures or caps 1() and l1. rlhe casing 9 may be in the form of a simple tubular member made of paper, cardboard or other suitable material, the length of the said casing part being slightly greater than the length of the coil, as shown in Fig. 2.

The

cap members

10 and 11 are preferably provided with peripheral flanges 12 and 13 respectively, the said flanges being formed integral with the tops or end closure parts proper and extending inwardly over the adjacent ends of the coil. By preference, the flanges 12 and 13 of the caps tit over the outside of the tubular casing 9, as clearly shown in Figs. 2 and 3. The

end closures

10 and 11 are axially apertured, as indicated at 14 and 15 in Fig. 3, to fit over the projecting ends of the tube 8.

When the casing 9 and end closures l() and 11 are assembled over the coil 5 as above described, the projecting end portions of the tube 8 are swaged outwardly as shown at 16 and 17. so as to overlie inner marginal portions of the

respective end closures

10 and 11. When the tube 8 is made of WaX impregnated paper as above described, the swaging of the ends of the tube` may be effected by means of a heated swaging die fitting inside of the tube 8 and having a properly shaped shoulder to force the ends to the desired outwardly offset position, such as illustrated. It will, of course, be understood that the wax or other material with which the tube is impregnated is such that at ordinary temperatures, the material is in a solid state and when heated softens so that it may be molded to the desired shape. Hence, it will be understood that the material with which the tube is impregnated serves to cause the ends of the tube to retain their outwardly sWaged shape.

The entire coil covering may be formed of suitably moisture-proofed or otherwise treated pa er or other material or the completed casing may be dipped or otherwise coated with a suitable sealing compound, such as varnish, shellac, paraiiin or the like, which will serve to moisture-proof the casing and also to cement or bind the parts of the casing permanently together.

For facilitatingv connection of the coil in an electric circuit, I provide conductors 18 and 19 which are electrically connected to

suitable terminals

20 and 21 respectively, to which terminals the inner and outer ends 5a and 5b respectively of the coil winding are also connected. The terminals or

connectors

20 and 21 are preferably of an eyelet form, as best shown in Fig. 2, the same having tubular portions 22 which pro'ect through an insulating material disc 23, t e said tubular portion being clinched over the inside of the said disc 23, as shown at 24. The disc 23 constitutes a terminal support and is preferably formed of suitable insulating material, in the present instance a suitable grade of paper, the said disc being axially aper'' tured to fit over the end of the tube 8 and of such an outer diameter that it will iit inside of one end portion of the casing 9, as clearly shown in Fig. 2. The tubular portion 22` of the terminal may, of course, be simply in the form of one or more prongs projecting through the disc 23 and clinched over the inside of the support 23. Aninsulating material annular disc 25, similar to the terminal support 23 is interposed between the terminal support 23 and the coil 5 to protect wires of the coil from damage by the bent over prong portions 24 of the connector.

A portion of the covering, preferably the adjacent cap 10, is provided with an opening 26 adjacent the periphery of the cap through which opening the conductors 18 and 19 extend from thev inside of the casing to the outside. The casing part overlying the

terminals

20 and 21 may be bulged outwardly slightly, as indicated at 27 in Fig. 2, due to the thickness of the said terminals. Such bulging is readily ermitted in the present instance Without injury to other parts of the casing due tothe normal flexibility of paper and also to the form of opening 26 herein shown, which opening obviously lrelieves the end closure proper from the stiffness otherwise present because of the flange 12. The opening 26 may conveniently be sealed against moisture or other matter by means of sealing wax or'the like so that the 'casing will be substantially moisture-proof and permanently sealed.

I have herein described a coil structure which is substantially cylindrical and I have termed the covering-a drum. It is to be understood that the drum may be any shape besides cylindrical, depending, of course, upon the shape of the coil which obviously may be of many shapes other than that described.

While` the above described coil is designed to meet the requirements of one specific purpose, which is not material to the present application, Iam aware that the features of construction are well adapted to electric coils and windings for a variety of purposes, and I am aware that changes may be made in the form, construction and arrangement of parts without departing from the spirit of my invention, the scope of which should be determined by reference to the following claims, the same being construed as broadly as possible consistent with the state ofthe art.

I claim as my invention:

1. In combination, an electric coil winding and a protective casing therefor comprlsing a paper drum enclosing said wind- 1ng said drum including a tubular part around the outer periphery of the winding, and end closures for the opposite ends of said tubular part, said end closures being also of paper and having integral flanges also extending over the periphery of the winding and overlapping said tubular part.

2. In combination, an electric coil winding, a terminal support disposed atwise adjacent a part of said coil, a terminal mounted on said support, said coil being electrically connected to said terminal, a protective covering for said parts comprising a paper drum enclosing said parts, ,said drum being provided with an opening, a conductor extending through said opening and connected to said terminal inside of said drum.

3. In combination, an electric coil winding, a terminal support disposed fiatwise adjacent a part of said coil, a terminal mounted on said support, said coil being electrically connected to said terminal, a protective covering enclosingsaid parts comprising a paper drum formed of a plurality of independent parts assembled over said coil and terminal support, means for uniting said parts to maintain the same in assembled position, one of said parts being provided with an opening, and a conductor extending through said opening and connected to said terminal inside of said easing.

4. In combination, an electric coil Wind ing, an insulating, sheet material terminal support disposed flatwise adjacent a part of said coil, a terminal mounted on said support, an insulating 'sheet material member interposed between said terminal support and said ycoil part, said coil being electrically connected to said terminal, a protective covering for said parts comprising a paper drum formed of a plurality of independent parts assembled over Said coil and terminal support, means for uniting said parts to maintain the same in assembled position, one of said parts being provided With an opening, and a conductor extending through said opening and connected to said terminal inside of said casino.

5. In combination, a tube, an electric coil Winding on said tube, said tube having end portions projecting outwardly beyond the ends of said coil, and protective means enclosing said coil comprising a tubular casing fitting around the periphery of said coil, and apertured end closures fitting over the opposite ends of said tube,"`said end closures covering the opposite ends of said coil and being united to said easing, the projecting ends of vsaid tube being sWaged outwardly so as to overlap inner marginal portions of said end closures, thereby to maintain said end elo'- sures in assembled position.

G. In combination, an electric coil Winding, a terminal support disposed iiatwise adjacent a part of said Winding, a terminal on said support, said coil being electrically connected to said terminal, a protective covering for said parts comprising a easing fitting around the periphery of said coil and provided with end closures covering the ends of said coil, said covering being provided with an opening, a conductor extending through said opening and electrically connected to said terminal inside of said covering, and means for maintaining said covering parts in assembled position around said Winding.

7. In combination, an electric coil Winding, a terminal support of non-conducting sheet material disposed flatwise adjacent a part of said Winding. a terminal on said support,

said coil being electrically connected to said terminal, a protective coveringv 'for said parts comprising` a casing fitting around the periphery of said coil and provided with end closures covering the ends of said coil. said covering being provided With an opening, a conductor extending through said opening and electrically connected to said terminal inside of said covering, and means for maintaining said covering parts in assembled position around said Winding.

8. In combination, a tube, an electric coil Winding on said tube, said tube having end portions projecting from the ends of the coil,

a terminal support disposed tiatwise adjacent a part of said coil, a terminal on said support, said coil being electrically connected to said terminal, a protective covering for said parts comprising a casing itting around the periphery ot said coil, annular end closures for said casing fitting over the projecting ends of said tubular core, said core ends being swaged outwardly to overlap inner marginal portions of said end closures to thereby maintain the same in, assembled position, and a conductor electrically connected at one end to said terminal inside of said cove `ing, said covering being provided with an opening permitting said conductor to extend outwardly therethrough.

9. In combination, an electric coil Winding, a terminal supporting disc disposed adjacent one end of said coil, a terminal mounted on said disc, said terminal having a portion projecting through the disc and clinched on the inside thereof` a disc of insulating material interposed between said terminal supporting disc and the adjacent end of said coil for protecting said coil from damage by said clinched terminal portion, and a protective covering for said parts comprising a tubular casing tting around the periphery of said coil, and end closures for the ends of said casing, one of said end closures being provided with an opening, and a conductor extending through said opening and connected to said terminal inside vof said casing. A

10. In combination, a tube, an electric coil Winding on said tube, the latter having end portions projecting from the respective ends of said coil, an annular terminal disc fitting around said tube and disposed adjacent one end of said coil, a terminal mounted on said disc, said terminal having a portionl extending through the disc and clinched over the inside thereof, an annular insulating material disc interposed between said terminal disc and the adjacent end of said coil, a protective covering enclosing said parts and comprising a tubular casing fitting around the periplr ery of said coil and annular end parts fitting around said projecting tube ends and united adjacent their peripheries to said casing, said projecting core ends being sWaged outwardly to overlap inner marginal portions of said annular end closures to hold the same in assembled position, one of said end closures having an opening therein, and a conductor extending through said opening and electrically connected to said terminal inside of said casing.

ll. In combination, an electric coil Winding having a center opening, a tube in said opening having end portions projecting beyond the ends of said coil` a terminal supporting annular disc fitting over one of saidV tube ends and disposed flatWise adjacent one end of said Winding, a terminal eyelet electrically connected to said Winding and mounted lln on said support, said eyelet having a prong portion projecting through and bent over the inside of the support to fasten the ter- .minal thereon, an insulating material, annular disc interposed between said terminal support and the coil for protecting said coilfrom damage by said, bent over terminal prongs, a protective covering for said parts comprising a tubular casingfitting around the periphery of saidl coil, annular end closure members fitting over said tube ends and closing the ends of said tubular casing, one of saidend vclosures being apertured, an electric conductor extending throughsuch aperture and connected to said terminal inside of said covering, the ends of said tube being swaged outwardly to overlap inner marginal portions of said end closures, thereby to maintain said covering parts in assembled position around said enclosed parts. o i

12. In combination, an electric coil winding having a center opening, a paper tube in said opening' having end portions projecting beyond the ends 'of said coil, a terminal supporting annular disc fitting over one .of said tribe ends and disposed atwisefadjacent lone end of said winding, aterminal eyelet' electrically connected to said winding and mounted on said support, said eyelet having -a prong portion projecting through and bent over the inside of thesupport to .fasten the terminal thereon, an insulating material a n-.

-ble'd position, said casing being provided with an opening, and a. lconductor eirtending through said opening and connected inside of sald casing to said termlnal.

13. In combination, an electric coil wind-l ing having a center opening, a'paper tube-in said opening having end portions projecting beyond the ends of said coil, a terminal supporting annular disc fitting over one of sa1d tube ends and disposed flatwise adjacent one end of said winding, a terminal eyelet electrically connected to said Winding and mounted on said support, said eyelet having a'prong portion projecting through and bent over the inside of the support to fasten the terminal thereon, an insulating material annular .disc

linterposed between saidterminal support and the coil for protecting said cil from damage by said bent over terminal prongs, a. protec tive covering for said parts comprising a paper drum including a tubular casing fitting around the periphery of said coil, and a pair of axially apertured, flanged cap members fitting overy and closing the ends of said tubular j casing, the apertures in said caps fitting around said paper tube ends and the latter being swaged outwardly 'to overlap inner 'marginal portions' ofsaid caps, thereby to l maintain said casing parts in assembled position, said casing being provided with an open-y ing, a conductor extending through said opening fand connected inside of said casing to said terminal, said casing being coated with a sealing compound serving to moisture-proof the casing and also to permanently unite the parts thereof.

14. In combination, la pa er tube, an electric coil winding on said tu e, said tube having end portions projecting outwardly beyond the ends of said coil, and protectiveI means enclosing said coil comprising a tubular casing fitting around the periphery of said.

coil, and apertured end closures fittlng over the opposite ends of said tube, said end closures covering the opposite ends of said coil.;

Vand being united to said casing, the projecting ends of said tube being swaged outwardly so asto overlap innermarginal portions of said. end closures, thereby tomaintain said end closures in assembled position, said paper -M tube being impregnated with a normally hard, wax-like composition which softens when heated, said composition normally serving to cause the tube e'ds to retain their outwardly swaged sha e.

in combination, electric coil winding and a protective casing therefor formed of paper or the like, said casing comprising a substantially cylindrical drum adjacent the inner l A10o 15. Ina device of t e class described andu periphery of said winding and a similar drum L adjacent the 'outer periphery thereof, annular'caps forthe ends'of said winding having cylindrical flanges overlapping sald outer drum, saidcasing forming a substantially` complete enclosure for said winding, and a plurality of binding strips of insulating material extending completely. around said coil 'winding transversely of the turns thereof.

16. In a device of the class described and in combination, an electric coil winding and a protective casing therefor formed of paper or the like, said casing comprising a substantially cylindrical drum adjacent the inner periphery of said windin and a similardrum adjacent the outer perip caps for the ends of said windirg having cylindrical flanges overlapping sai outer dru m, said casing forming a substantially complete enclosure for said winding, and a sleeve of relatively stiff insulating material disposed on the interior of said inner drum, the ends of said sleeve being flanged outwardly so' as to overlap saidy caps.

ery thereof, annular` oHARLEs M wiNKELimN.