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Патент USA US2122894

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July 5, 1938.
Filed Oct. 8, 1935
vi 14/. 6,465,?
PatentedJuly 5, 1938
John w. Sager, Chicago, nil, assignor to west-‘
crn Electric Company, Incorporated, New'York,
N. Y.,' a corporation oi; New York -
Application October 8, 1935,v Serial No. 44,023
1 Claim.
(01. 175-.-362) ’
This invention relates to electrical coils and a
method of manufacturing the same, and ‘more
particularly to electrical induction coils.
‘ 'In ‘the manufacture of certain types of elec
5 trical induction coils, it is the practice in some
instances to wind the primary and secondary
windings concentrically from a continuous length
of wire and subsequently‘ pullout a portion of
‘ the wire intermediate the windings to provide
ceedlng layer and also to further insulate the' ad
iacent layers of wire from each other.
When the required number of turns of‘ wire
have been wound to form a primary circuit of the
desired electrical characteristics, the winding op
eration is temporarily interrupted and a retain
ing strip l6, preferably composed of insulating
material, is introduced into‘' the coil by ?rst-in;
serting the wire in' a right angle slot I6 of the
retaining strip, as shown in dotted outline in Fig.
10 an outer lead for the primary winding and an
inner lead for the secondary winding. While . 2, and then placing the. retaining strip longi
this practice has proven advantageous in‘ that it
accelerates the winding operation, it has been
tudinally' of‘ the coil in contact with the outer
layer of the primary winding and with the slot
found that dif?culties are sometimes encountered l6 positioned near one end of the coil. Several
15 in locating the intermediate portion ‘of the wire
' turnsof wire are then wound about the retain
and in pulling it out without disturbing the‘ ad'
‘ jacent turns of the primary and/or secondary
An object of the present invention is to im
29 prove the construction of electrical coils of the
' above type and expedite the manufacture there
of by obviating the above mentioned dimculties.
In accordance with one embodiment of the in
25 vention, there is provided an electrical induc
tion coil in which a pair of retaining strips are
disposed longitudinally of the coil between the
primary and secondary windings, the retaining
ing strip i5 adjacent the slotted end thereof,
as indicated atl?, after which a second retain
ing strip i5 is- placed longitudinally of theycoil
‘similarly to the ?rst retaining strip and adja
cent thereto, as shown in Fig. 3. The winding
operation is then resumed and is continued until
the‘ required number of turns have been wound
to form a secondary circuit of the desired elec
trical characteristics.
Upon the completion of the winding operation,
the coil unit is removed from the winding arbor
and, .as is customary, the inner end of the pri-»
strips being slotted for interlocking engagement ' mary winding is pulled out to provide an inner '
30 with the outer end of the primary winding and
the inner end of the‘secondary winding, respec
tively, to thereby positively prevent the with
drawal or displacement of more thanv the sev
eral turns of wire between the two anchor strips
as intended for the leads.
1 '
Other features and advantages of the inven-
tion will become apparent from the following de
tailed description thereof when read in conjunc-
tion with the accompan ng drawing in which
_Flg. -1 is a perspectl e view of. an electrical
induction coil unit embodying the invention;
Figs. 2 and‘3 are perspective views illustrating
lead“ for theprimary winding and the outer
end of the secondary winding is pulled out to 30
‘provide an outer lead 2| for the secondary
The several turns IQ of ,wire that were wound
between the two retaining strips I5 are pulled
- out and cut medially thereof, as indicated by
the dotted line in Fig. 1, to provide an outer lead
‘ 22 for the primary winding and an inner lead 23
for the secondary winding. In order that .these
several turns/o‘! wire may be readily located, the
retaining strips I! are preferably constructed
and arranged so that the ends thereof extend
beyond the adjacent end of the coil unit, and are
- such a coil unit in the process of being wound, of a color different fromthat of the interleaving
and .
sheets l3.
(Fig. 4 illustrates the invention as‘ applied to the ;
An important feature of the invention is the
winding of a plurality of coil units simultane
interlocking engagement of the retaining strips
An induction coil" embodying the present in
vention may be initially formed by winding an
with the outer end of the primary" winding and
the inner end of the secondary winding, respec
tively, whereby the withdrawal'of more than the
several intermediate turns ID. of wire intended 50
tubular core or lining ll removably placed upon ( for the leads is positively prevented.
a windin'gj'arbor l2 of a suitable winding machine
When winding a series ofcoil units simulta
(not shown). Upon the completion ‘of each layer neollsly
on a singlewinding arbor, the retaining
of wire a sheet [3 of'insulating material is strips are preferably of su?lcient length to ex
55 wrapped therearound to support the next suc
tend across the series of coil units, as shown in
50 insulated‘ wire ill in successive layers about a
Fig. 4, and are provided with a series of right
angle slots; such as ll, corresponding in number
to the number of coil units being wound and
spaced apart in accordance with the spacing of
tinuous length of wire, each coil comprising a
the coil' units on the arbor.
strips are later severed intermediate adjacent
coil units at the time the series or "stick" of coil
remaining - portion of said layer, whereby said
separated portion may be drawn out to form ex
units is separated into individual coil units by
cutting transversely between the coil units,
10 indicated by the dotted lines in Fig. 4.
plurality of layers oi’ windings and retaining
means for separating a portion of a layer in one
of said coils lying adjacent the other coil from the
ternal connections for the respective coils, said
retaining means comprising strips of material dis
posed transversely of said layer or windings, and
said strips having angular wire receiving slots
for interlocking engagement with the wire at the
It should be understood that the invention
Junctions of said separated portion with the re
is not limited to the particular embodiment
thereof herein illustrated. and described except . spective coils, whereby the withdrawal of more
than said separated portion of said layer is posi
insofar as is de?ned by the following claim.
What is claimed is: ‘
An electrical coil structure comprising concen
tric inner and outer coils wound from a con
tively prevented.
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