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Патент USA US3027536

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March 27, 1962
Filed Dec. 23, 1957
2 Sheets-Sheet 1
\ 3\ .A 2\ 5\ m
j“ W?
March 27, 1962
Filed Dec. 25, 1957
2 Sheets-Swat 2
United States Patent Qf?ce
Patented Mar. 27, 1962
Lawrence T. La Patka, Collingswood, N.J., and Jacob
J. Mayer, Ivyland, Pa., assignors to Burroughs Corpo
ration, Detroit, Mich., a corporation of Michigan
Filed Dec. 23, 1957, Ser. No. 704,441
6 Claims. (Cl. 336-66)
It is an additional object of the invention to provide
a magnetic core package assembly.
in accordance with a preferred embodiment of the
present invention there is provided a dielectric jacket or
sheath for a non-magnetic core bobbin having peripheral
end ?anges and ‘a recess therebetween. A hollow stain
less steel or other non-magnetic type bobbin is provided
with a plurality of wraps of magnetized material which
are disposed in the recess intermediate the ?anged ends
This invention relates to magnetic cores, and more par
ticularly to magnetic cores provided with an external di
electric protective covering or sheath, and package as
thereof. The jacket comprises a pair of dielectric, sub
stantially concentric, cylindrical members between which
semblies thereof.
the bobbin is press ?tted.
The ends of the dielectric
Various types of electrical apparatus, such, for ex
ample, as electronic computers, include magnetic cores
cylinders being joined around the ?anged ends of the
plied thereto. One type of magnetic core that is utilized
provided with an integral handling tab or projection
which is adapted to support the core assembly during the
application thereto of the electrical toroidal windings and
bobbin so as to contractually engage the ?anged ends
having electrically conductive windings distributively ap 15 thereof. The external peripheral wall of the jacket is
extensively in such structures, particularly in relatively
large scale computational equipment, comprises a non
magnetic bobbin, for example, of stainless steel ‘or ce
thereafter to supportthe completed magnetic core as
ramic material, which has applied thereto a number of 20 sembly on a dielectric panel or other utilitarian struc
wraps of magnetizable material such as Molypermalloy.
ture. Preferably the jacket is molded as a unitary ‘struc
In those instances wherein the bobbin is con?gured to
ture with the cylinders joined at one end and open at
have peripheral end ?anges or rims thereon, the mag
the other, whereby the core can be inserted between the
netizable material is disposed on the bobbin in the area
25 open ends to place the core body between the two cyl
intermediate the rims or ?anges. In order to obtain the
inders after which the open ends are sealed together.
desired electrical characteristics it has been found neces
A more complete understanding of the invention can
sary to coil the magnetizable material relatively tightly
be had from the following detailed description taken in
and to engage the end wraps so that the wraps will not
conjunction with the appended drawings in which:
come uncoiled. Each wrap is electrically insulated from 30
PEG. 1 is an enlarged isometric view of the preferred
every other wrap. Techniques for accomplishing the
form of dielectric jacket embodying the present invention
latter results may be in accordance with the steps set
and showing one form of handling tab‘;
forth in detail in copcnding U.S. Patent Application to
FIG. 2 is an enlarged isometric view similar to FIG. 1
Charles B. Hebeler, Serial Number 479,130‘, ?led Decem
but illustrating a completely sealed jacket housing a
ber 31, 1954, now Patent Number 2,925,962, entitled 35 core and showing a modi?ed handling tab; .
“Magnetic Core Wrapping Apparatus,” and assigned to
FIG. 3 is atop plan view of a completed magnetic core
the same assignee as the present invention.
Additionally these cores are provided with electrical
assembly including the operating windings;
toroidal windings ‘applied thereto in any suitable manner,
such as by an automatic machine of the type described
sembly of FIG. 3, the view being taken ‘along the line
4—4 of FIG. 3, and with the handling tab broken
and claimed in copending U.S. application to William
Blackburn, S.N. 648,682, ?led March 26, 1957, now Pat
ent Number 2,973,159, entitled “Machine for Winding
FIG. 5 is an enlarged fragmentary corner portion of a
Toroidal Cores” and assigned to the same assignee as the
FIG. 4 is a greatly enlarged sectional view of the as
modi?ed magnetic core assembly;
FIG. 6 is an isometric view of a portion of the core
present invention.
45 winding shuttle and the core supporting jig used there
In order to provide the necessary dielectric properties
with, and a magnetic core in winding position;
for the magnetic core assembly, and also to provide a
suitable smooth protective base or foundation for the
aforementioned wire windings, it has been customary to
FIG. 7 is an enlarged view of a magnetic core of the
present invention disposed in a portion of a notched di
ping or wrapping, an electrically insulating covering prior
disposed in a groove in a portion of a dielectric panel;
to the addition of the wire windings thereto. These tech
niques work very well with large size magnetic cores, how
ever, on cores of exceedingly small size the bore diameter
of the core bobbin is so small that if ordinary insulating
material and techniques were utilized therewith the wire
winding shuttle of the toroidal winding machine could not
enter, much less pass through the bore of the core. Also,
extremely small size cores increase the time consuming
FIG. 9 is a, partial sectional view along the line 9-9
of FIG. 8;
FIG. 10 is an isometric view of a dielectric panel
mounting magnetic cores in accordance with the inven
tion and having means pluggably connecting the panel
to a receptacle; and,
electic panel;
apply to the core bobbin, as by painting, spraying, dip 50 - FIG. 8 is a side elevational view of a number of cores
handling problems inherent therein.
FIG. 11 is an enlarged view of a portion of an insu
lating panel, showing a plurality of cores mounted there
60 on and the manner in which an advance winding can be
interconnected or stitched therethrough.
It is an important object, therefore, of the present
As stated hereinabove, the present invention is par
invention to provide a simple and inexpensive sheathed
ticularly adapted for insulating ?anged cores of the type
magnetic core overcoming the aforementioned problems.
employing one or more turns of a magnetizable wrap.
It is also an important object of the present invention
to provide an improved, efficient and relatively thin pro 65 However, it is to be understood that the apparatus herein
described is of broader applicability and lends itself
tective covering for magnetic cores and the like.
‘ It is a further object of the present invention to pro
vide a relatively rigid yet pliable cheaply fabricated mag
equally well to magnetic core structures or assemblies
utilizing only a toroid formed of the magnetizable mate
netic core jacket or sheath having a high degree of me 70
Referring now to FIGS. 1 through 5 which Willbe dis
chanical stiffness ‘and a smoothly contoured external sur-’
cussed simultaneously, there is shown an electrically in-.
sulating jacket or sheath 10 in the form of a double
‘Walled vsleeve of semi-rigid, resistingly yieldable structure
throughout a major portion of the'vertical dimension
which is or may be fabricated from Nylon for example,
or other material having similar qualities. The jacket
structure comprises a pair of concentric but spaced apart
insulating jacket preferably is performed by automatic
of the jacket wall at the time it is molded. However, in
asmuch as the encapsulation of the bobbin within the
machinery which utilizes heat and pressure to seal the
open ends of the jacket walls, it is desirable to form the
electrically insulating cylindrical members 12 and 14 be
tween which a bobbin 16, MG. 4, described in more de~
tail later on, is adapted to be press ?tted. 1 Preferably the
, jacket‘ so as to accept these later applied tools.
ends (FIG. 4) of the‘ members 12 and 14 are initially
To this end, the wedge shaped tab may be undercut,
as at 42. permitting the sealing and/ or encapsulating tool
low container or- receptacle havingan axial bore 29 there 10 to be received thereover without interference. It is to
be noted that the tab 40 of FIG. 1 is wedge'shaped in two
through (FIG. 1),."and adapted to receive and retain a
molded together, as at‘ 18, to form a double walled, hol
small article such as a stainless steel, ceramic or other
_ dimensions; It is thicker at the top than at the bottom.
type of nonmagnetic‘ rbobbin in the space between the
It is also narrower at'the root, i.e., at’ the wall of the
jacket than it’ is at its outer end portion. This particular
In the fabrication of magnetic. cores generally, it is com 15 shape permits its'utilization in a manner and by means
walls‘ of the cylinder. ‘
mon to employ a bobbin whose overall con?guration is
quit'eysimilar to that‘ used in sewing machines. Such a
of apparatus to be described later on.
The wedge shaped tab 44 of the core assembly shown
indicated at 30 in FIG; 5.
of the jacket after its insertion therein is accomplished, >
in FIG. 2 is wedge shaped in only one dimension and
structure usually includes peripheral end ?anges 22 and
' is a simpler form of the tab con?guration of’ FIG. 1. It
24 (FIG. 4)“ de?ning an intermediate recess 26 therebe
tween; The end ?anges of- the bobbin may be arcuately 20 has not been shown undercut because in this case the
height of the jacket Wall is such as to make it unnecessary.
turnedlvorl rolled over, as indicated'at 28 in FIG. 4, or the
Encapsulation of the core within the hollow con?nes,
flanges may be formed substantially at right angles, as
by forcing the inner and outer wall ends, shown in dotted
32, which may be of the type capable of assuming either 25 outline in FIG. 5; toward each other over the bobbin
?anges as shown in solid outline in FIG. 5. This opera;
of two stable‘ states of magnetic remanence, such for ex
tion may be performed by hand or it may be done by
ample‘ as Molypermalloy, are applied to the bobbin, the
means of a rotating, heated mandrel (not shown), shaped
wraps being electrically insulated from each other by a
> One or more turns or wraps of magnetizable material
continuous'?lm 34 of suitable material, such as a mixture
to arcuately bend or roll over the two concentric wall
during the application of the magnetizable material to the
gether, as indicated at 46 in FIGSA and 5.
of magnesium‘ oxide in oil which is applied tothe wraps 30 ends laterally into abutting contact, sealing the ends to‘
The ?nal turns are or may be spot welded
The wedge shaped tab 40 or 44 also is useful inprm
viding means for supporting the core on an insulating
panel 48, FIG. 7, in such a position that the applied winds
ble material from uncoiling or slipping on the bobbin.
As can be seen fromv FIG. 1, the inner wall‘ 14 of the 35 ings 38 are not or cannot become damaged by being
together by means (not shown) to prevent the magnetiza
two concentric members preferably is slightly thinner
pressed against the supporting structure.
of the toroidal electrical energizing windings 38 to the '
cores permits the conductive lead wires (not shown), to
As shown most clearly in FIG. 8, a plurality of toroidal
than the outer wall 12 thereof, thereby to maintain the
wire wound magnetic cores 50' may have their respective
diameter of the axial bore of the core assembly as large as
possible, particularly when the overall size of the core is' 40 wedge shaped tabs '40 or 4-4 ?tted into a groove 52 of
similar shape in a dielectric panel 48 so vthat the bores
exceedingly small, thus to permit the shuttle 36 (FIG. 6)
20‘ of cores are in axial alignment. One or more rows
of the toroidal’ core winding machine fr'agmentarily
may be provided, as desired. This disposition of the
_ shown at 37, to pass therethrough during the application
core assembly.
In order to produce a‘ desired electrical output and to
provide the required characteristic storage features, the
, core assemblies in the past have been supported for wind
ing in a U-shaped clamp which gripped the insulatingly
be readily available for interconnect-ion into other asso
ciated electrical circuitry or to be connected to other elec
trical components (not shown) with which the core as
semblies are to be utilized.
One important use of such magnetic cores is in a so
called shift register for electronic computational appa
covered core at opposite rim portions thereof. This oper
ation many times deformed the bobbins and on occasions 50 ratus. Shift registers employ multiple magnetic core
where the operator was careless the bobbins were actu
assemblies in conveniently packaged units, which in
ally broken. To avoid such deformation and/or break
many instances are made to be pluggalbly connected into
age, as well as to provide a more efficient and easier
other associated electrical circuitry.
One embodiment of such a packaging ararngement ad
mass produced magnetic core assembly, thev encapsula
tion technique and resulting product of this invention has 55 vantageously provided by the present invention is set
forth in FIG. 10. A dielectric supporting member 54
successfully overcome these disadvantages. The semi
rigid plastic shell wholly enclosing and sealing the bobbin
and 'magnetizable material therein, together with handling
in the form of a panel or board is provided with a plu~
rality of rows 56 and columns 58 of slots or grooves.
The rows and column slots 56 and 58 are wedge shaped,’
means to be described hereinafter, provides a desirable
60 with the larger portion of the Wedge con?guration being
sub-assembly for further fabrication.
disposed at the bottom of the slot, and the narrower or
Even with the rigid, non-deformable steel bobbin, the
apex portion of the slot at the top. This construction per
distributed» electrical windings are‘ many times a problem
mits the projecting tab 40‘ of each core 50 to matingly
to apply. For example, when part of the windings have
been applied and the core is then rotated, say through 65 engage with and be positionable on the panel 54 as by
sliding the tab along the groove. This structural con?g
180 degrees,‘to expose the unwound periphery of the core
uration also permits the magnetic cores to be freely
bobbin to the winder shuttle, the already applied wind
mounted on the top, bottom or edges of the panel, as
ings, when utilizing the earlier mentioned U-clamp struc
desired, without danger of dislodgement or loss of the
ture,_often-were subject to compressive deformation and
, sho'rt-circuiting or breakage due to the pressure exerted 70 cores therefrom.
In order to permit the utilization of the maximum num
thereon‘ by the U-clamp.
To avoid these and other problems, integrally molded
' with the double-walled jacket at the time of its fabrica
ber of cores 50 at any one time on a single panel 54 a
number of notches‘ 60 may be milled, molded or other
wise formed in the‘ edges of the panel. Since the panel
' tion is a small,‘ substantially wedge-shaped handling ‘pros
jecti'on or tab 40" (FIG. 1‘). This‘ tab extends" vertically‘ 75 assembly is to be pluggably connected to the electrical 7
circuitry used therewith, a receptacle 62 shown in broken
lines, is or may be provided. One end of the panel 54
is provided with a plurality of electrical busses 64 which
are adapted to interengage with electrical contacts (not
shown) in the receptacle when thepanel vend is intro
duced therein. The opposite end of the panel may be
maintained free of core structures to provide handling
means when engaging or disengaging the panel with the
end ?anges thereon providing a recess between said
?anges, magnetizable material disposed in said recess, an
insulating jacket enclosure for said bobbin, said enclosure
comprising a pair of outer and inner substantially con
centric cylindrical members, one around the outside of
the bobbin, and the other extending through the bore of
the bobbin respectively, the ends of said cylindrical mem
bers being joined together around the ?anged ends of said
bobbin so that the spaces between the ends of cylindrical
If desired, an aligning or orienting key 66, mating with 10 members are closed, a plurality of electrical conductors
a complementary slot 68 may be provided in the panel
disposed on said assembly'in a manner projecting through
and the receptacle respectively to prevent the panel from
said inner cylinder and around said joined ends and said
being misaligned with the receptacle and to permit the
outer cylinder, and a handling structure extending from
equipment to be efficiently handled by an inexperienced
said jacket, said handling structure comprising a wedge
operator having little or no training in the use of such 15 shaped projection, said projection being wedge-shaped in
two dimensions and extending throughout a major por
It is apparent from the foregoing that by placing a
tion of the axial length of said jacket and being provided
plurality of cores as in FIG. 1l—enlarged to illustrate the
with an undercut portion adjacent to the jacket wall.
invention-on a panel 48, making it possible to stitch the
3. A magnetic core supporting assembly comprising, an
advance windings 70 through the core bores 20 of any 20 annular non-magnetic tubular bobbin having a central
reasonable number of coreswith the shuttle 36 of-the ear
lier mentioned toroidal winding machine, without hav
ing to cut or break the winding 70‘, as was the case with
hub-and oppositely disposed end ?anges forming a periph-,
eral recess therebetween, magnetizable material disposed
in said recess and wrapped thereon so as to tightly hug the
known prior art apparatus.
hub of the bobbin, an electrical insulating toroidally
The single advance winding 70‘, as shown in FIG. 11, 25 shaped non-magnetic jacket surrounding said bobbin with
avoids soldered joints and the attendant di?iculties there
portions thereof extending through the bobbin bore and
with. Additionally, a single electrical advance winding
around said ?anges contractually engaging said ?anges to
is simple and faster to apply to the already aligned cores,
tightly enclose said bobbin, a plurality of electrical con
and its operation is much more e?icient and less liable
ductors encircling said portions of said bobbin through
to failure than the soldered winding of prior art struc 30 said bore, a dielectric supporting structure including elec
trical conductive areas thereon forming electrical con
If desired a dust cover 72, shown in broken lines,
doubling as an electrical shield may vbe employed with
necting elements, said dielectric member being provided
the ?nal panel and receptacle assembly. In this event the
forming part of said jacket extending outwardly away
with a matrix of rows and columns of grooves, means
cover, which may be either insulative or conductive de 35 vtherefrom and demountably received in the grooves of
pending on its desired end use, is or may be press ?tted
said dielectric member so as to matingly engage therein
to the sides and end wall surfaces of the receptacle.
thus to secure said core and said jacket to said supporting
There has thus been described a novel, easier fabri
structure, and means connecting certain of the conductors
cated, magnetic core assembly utilizing a structurally semi
rigid dielectric sheath or jacket completely covering the
inner and outer walls and the ends of the bobbin. In
encircling said core to the connecting elements of said
supporting structure.
4. A magnetic core mounting assembly comprising, a
tegral handling means on the jacket permits the applica
dielectric member including a plurality of electrical con
tion of distributed electrical windings thereto. by means.
ductors thereon forming an electrical circuit connecting
of automatic high speed machinery and facilitates the
means, said dielectric member being further provided
mounting of the completed assembly on panels and other 45 with rows and columns of slots, said slots being substan
structures. The novel sheath provides a tough, strong,
tially wedge-shaped, a plurality of magnetic cores, each
smooth and uniform foundation for the toroidal windings.
of said cores being provided with a dielectric jacket en
In addition the sheath has excellent insulating and me
closure surrounding the same, a Wedge-shaped supporting
chanical properties with the result that a relatively thin
member extending away from a portion of each of said
covering provides adequate protection to the core bobbin
jackets and receivable in the corresponding wedge-shaped
and its deformable magnetizable wraps.
slots of said dielectric member thus to support each core
What is claimed is:
in spaced relation relative to said dielectric member, an
1. A magnetic core assembly comprising, a non-mag
electrical receptacle for said assembly adapted to be con
netic tubular bobbin having an axial bore therethrough
to a source of electrical energy, said electrical re
and oppositely disposed outwardly projecting peripheral 55 nected
ceptacle being engageable with said conductors on said
end ?anges thereon providing a recess between said
dielectric member for completing electrical circuits
?anges, magnetizable material disposed in said recess,
through said receptacle to said source of energy, elec
an insulating jacket enclosure for said bobbin, said en
trical conductors surrounding portions of each of said
closure comprising a pair of outer and inner substantially
magnetic cores and being electrically interconnectible to
concentric cylindrical members, one disposed around the 60 the respective conductors of said dielectric member, align
outside of the bobbin, and the other extending through the
ment means in said receptacle, alignment means on said
bore of the bobbin respectively, the ends of said cylin
dielectric member engageable withthe alignment means
drical members being joined together around the ?anged
on said receptacle for properly orienting said dielectric
ends of said bobbin so that the spaces between the ends
member with said receptacle, and a cover member sur
of said cylindrical members are closed, a plurality of elec 65 rounding and enclosing said dielectric member.
trical conductors disposed on said assembly in a manner
5. A magnetic core assembly comprising, a magnetic
projecting through said inner cylinder and around said
toroidal one~piece core bobbin having an axial bore
joined ends and said outer cylinder, and a handling struc
extending therethrough, magnetizable material disposed
ture extending from said jacket, said handling structure
on said bobbin a non-magnetic, non-conductive, one-piece
comprising a wedge-shaped projection extending through 70 tubular
housing for said core bobbin, said housing having
out a major portion of the axial length of said jacket and
an inner and an outer cylindrical wall portion spaced from
being undercut slightly adjacent to the jacket wall.
2. A magnetic core assembly comprising, a non-mag
netic tubular bobbin having an axial bore therethrough
each other and joined together at one end in a substan
tially U-shaped con?guration so as to form a receptacle
having an axial bore therethrough, the inner cylindrical
and oppositely disposed outwardly projecting peripheral 75 wall portion of the U-shaped walls extending through the
bore of said core bobbin while the outer cylindrical wall
portion surrounds the outer periphery of the core bobbin
and the, upper free ends of the U-shaped walls being
joined together ‘over the core bobbin with their edges
sealed together in‘ a single circular seal thus to completely
enclose and hermetically encapsulate said core bob-bin
within said housing.
6. Arnagnetic core assembly, ‘comprising, a non-mag
netic tubular one-piece bobbin having ‘an axial bore there
tions of the receptacle being curved inwardly toward each
other with their edges sealed together in a single circular
seal thus completely enclosing and hermetically encap
sulating said wrapped bobbin within said housing, and- one
or more electrically conductive windings distributively
‘toroidal-1y encircling portions of said encapsulated bob
bin and passing through said bore;
References Cited in the ?le of this patent
»through and peripheral outwardly extending ?anges form—
ing a'recess around the outer surface of the bobbin be
tween the ?anges, inagnetizable material wrapped around
said bobbin within said recess, a non-magnetic, non-con
ductive, cylindrical one-piece tube encircling and housing
said wrapped bobbin, the Walls of said housing being of 15 2,494,206
molded U-sharied con?guration including an inner and
an outer wall portion closed at one end to form a re
ceptacle into which said bobbin is‘ received Within the
2,818,514 _
inner wall portion extending through the axial bore of
the bobbin and with the outer wall portion surrounding» 20
the outside of the bobbin, the upper ends of- the wall por
Gernsback i _______ _,__ Ian. 30, 1912' ~
_________ _.'._...-__. Sépt. 9, 1919 5'
Morrison '_ _____________.' Apr. 25, 1933'
Ross _______________
—-,--1-,-""‘-"f ----__"",July
Jan. it)‘,
4‘: 1950.
Nesbitt et al.j_..u _______ .. Aug. 22, 1950 '
Gaugler ___‘__‘____~ ______ ulcer. 2, 135iv
Goertz- et a1 ____ _.i._p..____ Dec. 31, 1957__
Jones ,._-.; ________ __;_.._ Feb. 11‘, 195$
_Iones..i_.;._> _______ __'..__; Feb. 11‘, 1958
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