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June 3, 1947.
G. H. TYNE
2,421,444
BOBBIN-WOUND COIL
Filed Aug. 5, 1944
i.mlsb‘ kwv
INVENTOR
2% 7/9”“
BY
W
Y
‘s
4
ATTORN
Patented .June 3, 1947
2,421,444
UNITED STATES PATENT OFFICE
2,421,444
BGBBIN-VVOUND COIL
Gertrude H. Tyne, New York, N. Y., assignor, by
mesne assignments, to Allied Control Company,
Inc, New York, N. Y., a corporation of New
York
Application August 5, 1944, Serial No. 548,214
8 Claims.
This invention relates to bobbin-wound coils.
In a conventional bobbin-wound coil, the bob
bin consists of a core provided with a pair of
heads or end flanges and the coil ?lls the space
betWeen the ?anges. Each lead wire for the coil
extends over the edge of a ?ange and moisture
retardant material is applied around the coil. It
is not possible on a production basis to-obtain a
satisfactory moisture-retardant seal for the coil
around the lead wires with this type of construc~
tion.
An object of this invention is to provide an im
proved moisture-retardant seal for the lead wires
of a bobbin-wound. coil.
In one embodiment of this invention, at least
one bobbin head or ?ange is composed of two
plates composed of a thermoplastic material, such,
for example. as cellulose acetate, but preferably
each ?ange is of this construction. Between the
tWo thermoplastic plates of one or both flanges
there is arranged a lead wire for each end of the
(Cl. 175--21)
2
spending plates ill) and I25 at the other end.
The core and ?ange plates are composed of a
suitable thermoplastic material,
for ex
ample, as cellulose acetate and the ?ange plates
have central apertures through which extend
the reduced end portions of the core
with each
end ?ange abutting a shoulder it of the core.
The
plate i la provided with two periph
eral notches it and 555 while the plate l2a is
provided ‘with apertures it and ii. A stranded
lead wire it? passes through the hole to and is
turned at right angles to extend from the inner
end of said hole to the periphery of the plate
lid
then passes through the notch. ill to the
space between the two inner plates Ho and Nb.
A lead wire it? passes through the hole Ill and
between the plates l to and Ella to the notch 55
through which it passes into the space between
the two inner plates Ho and lib. Both lead
wires are sealed between the plates lid and its
either by use of a suitable solvent such as ace
either
coil. The
enterlead
between
wire the
as plates
it leaves
by way
the ofcoil
a notch
tone or by heat and pressure applied to the two
plates 5 to and lilo or by use of a solvent in com~
in the rim of the inner plate or through an aper~
with the application of heat and press»
ture
said plate spaced from its periphery. The 25 bination
("7.
Preferably. the lea‘l wires i8
59 are
lead wire may emerge fro .o between the plates by
.
1
.
cated
between
the
plates
lie
and
52a
and
said
way of a notch at the periphery thereof or through
plates sealed together before assembly with the
a hole in the outer plate. In any event, a poiw
core
Although both lead wi es it and is
tiOn of the lead wire is located between the two
have
been
shown as assembled with the same
plates. After introduction of a portion of a lead
pair of plates, the invention comprehends that
wire between the two plates, the latter are sealed
one lead wire may be arranged between the two
together around the lead wire portion either by
plates Ho. and 52a and the other lead wire ar
use of a suitable solvent or by the application of
ranged between the plates iii) and 5% in the
‘ heat and pressure to the plates or by use of a
same manner as lead wires
and
herein
solvent in combination with the application of
after described.
heat and pressure. With this construction, a
A wire coil
is wound around the core 66 be
portion of each lead wire lies wholly within the
tween the inner plates Ma and. ill; with the end.
periphery of the bobbin ?ange. A coating of
fit of the inner coil layer extending outwardly
moisture-retardant material is applied to the coil
proper and extends over the ?ange peripheries. 40 along the inner surfaceof the plate its and in‘
sulated from the turns of the coil by a strip of
The lead wires are completely encased in mois
insulating tape, for example, acetate tape in the
ture-retardant material and a much improved
usual in
the end of this Wire being fas
seal for the coil is obtained.
led to the inner end or" the
wire it form
Other objects, novel features and advantages
s a tip
The end 523 or" the outer layer of
of this invention will become apparent from the
the coil
is fastened to the in nor end of the
following speci?cation and accompanying draw~
lead wi“e 58 forming tip it t.
ings, wherein:
lead \vi.
are silver soldered to the coil ends.
Fig. l is a longitudinal section through a CO1]
The
coil
20 is enclosed with a layer 24 of
embodying the invention substantially on the line
insulating tape such as cellulose acetate ta e and
l»—l of Fig. 2;
the tips £30. and tile of the lead wire and ends
Fig. 2 is an end View of
l on a reduced
of the coil are folded over into engagement
therewith. A second layer 25 of similar insulating
Fig. 3 is a side elevation of Fig. 2;
tape is then applied around, the info-lded tips Ito
Fig. 4 is an end view of a modi?cation;
and 59a. An insulating covering
preferably
Fig. 5 is a section on the line 5-5 of Pig. ei,
of cellulose acetate cloth scotch tape overlies the
and
entire assembly and extends ?ush with the sur
Fig. 6 is a fragmentary longitudinal section of
faces of the plates 5?. A ?nal coating 2? of
a still further modi?cation.
sealing lacquer such as acetate lacquer is ap~
In Fig. 1, it is the core of a bobbin having a
plied by dipping the assembled coil into a suit
pair of end ?anges each composed of an inner 60 able solution.
plate [la and an outer plate l2a and corre
In the modi?cation of Figs. 4 and 5, the plate
scale;
2,421,444.
3
Ha is provided with a peripheral notch 24a as
before and the plate 22a is also provided with
a peripheral notch 25a. The plates 21b and 2211
are provided with similar notches 24b and 25b.
The lead wires 28 and 29 are sealed between the
plates 21a and 22a and 21b and 2212 as previously
described with each lead wire extending through
a notch 24a or 241) from the space between the
plates and through the notch 25a or 251) to the
exterior of the coil. Otherwise, the structure of
this modi?cation is the same as previously de
scribed. If desired, both lead wires 23 and 29
may be arranged between the two plates of a
single flange in the same manner as the lead
wires I8 and i9 heretofore described.
In the modi?cation of Fig. 6, the coil struc
ture is the same as that of Fig. 1 except that
the plates I I0 and i'ic have no peripheral notches
4
wire, said plates being sealed together adjacent
said lead wire to retard moisture ?ow along said
lead toward the coil, and a coating of moisture
retarding material enclosing said bobbin and
coil.
4. A sealed coil according to claim 3 charac
terized by the two plates of one ?ange each
having a peripheral notch for receiving the lead
wire.
5. A sealed coil according to claim 3 character
ized by one plate of one ?ange having a periph
eral notch to receive the lead wire and the re
maining plate of said flange having an aper
ture through which the lead wire projects.
6. A sea-led coil comprising a bobbin having
end ?anges, a coil of wire on said bobbin be
tween said ?anges, a pair of superposed sleeves
coaxial with said bobbin and enclosing the coil,
a pair of apertures in each sleeve with the aper
and 3! of thermoplastic ma
tures in one sleeve being out of alignment with
terial surround the coil with the sleeve 31 en
the apertures in the remainingr sleeve and lead
closing the sleeve 39. The sleeve 39 has two holes
Wires passing through said apertures and being
32 and 33 while sleeve St has two holes 34 and
sealed between said sleeves.
35, the holes
and 35 being in offset rela
7. A device of the character described com
tion to the holes 32 and 33. The lead wire 18
prising
a wire coil, an insulating enclosure for
passes from the coil through the hole
then
said coil consisting in part or” a coil-supporting
between the sleeves
and 3! and ?nally through
bobbin including a pair of end ?anges, one end
the hole 34 to the exterior of the assembly. The
?ange consisting of a pair of contacting laminae,
lead wire 19 passes through the hole 33, between
an electrical lead arranged between said laminae
the sleeves 39 and 3! and then through the hole
30 with one end extending into the enclosure and
35 to the exterior of the assembly.
being connected to the coil and the other end
In each of the three modi?cations herein de
and two sleeves
scribed, the lead wires are tightly enclosed by
moisture-retardant material. The arrangement
is such that substantially no gaps or channels
exist along the lead wires by means of which
moisture might have access to the winding.
In
each instance, the lead wires are thoroughly and
completely covered and the entire assembly is
extending exteriorly of said enclosure, said lami
nae being sealed together adjacent said lead to
retard moisture ?ow along said lead into said
enclosure.
8. A device or the character described com
prising a wire coil, an insulating enclosure for
said cell including a central portion around which
said coil is wound, said enclosure consisting in
enclosed in a protective coating with no exposed
part of a pair of superposed sleeves surrounding
40
gaps or apertures.
said coil, an electrical lead arranged between
It is of course understood that various modi
said sleeves with one end extending into the
fications may be made in the coil herein de
enclosure and being connected to the coil and
scribed without in any way departing from the
the other end extending extericrly of said en
spirit of the invention as defined in the ap
closure, a passageway between opposite faces of
pended claims.
each sleeve for receiving the electrical lead, said
Iclaim:
sleeves being sealed together adjacent said lead
1. A device of the character described com
to retard moisture ?ow along said lead into said
prising a wire coil, an insulating enclosure for
enclosure.
said coil including a central portion around which
GERT UUDE H. TYNE.
said coil is wound, said enclosure consisting in
part of a pair of contacting laminae, an elec
trical lead arranged between said laminae with
one end extending into the enclosure and being
The following references are of record in the
connected to the coil and the other end extend
file of this patent:
ing exteriorly of said enclosure, a passageway
UNITED STATES PATENTS
between opposite faces of each laminae for re
ceiving the electrical lead, said laminae being
Number
Name
Date
sealed together adjacent said lead to retard
865,907
Jodrey __________ __ Sept. 10, 1907
moisture flow along said lead into the enclosure.
1,752,866
Trombetta ________ __ Apr. 1, 1930
2. A device of the character described com
1,815,212
Ogg ____________ __ July 21, 1931
prising a bobbin having an end ?ange composed
1,956,881
Strait ____________ __ May 1, 1934
of two contacting members, a wire coil supported
1,132,297
Apple ____________ __ Mar, 16, 1915
by said bobbin, and an electrical lead arranged
1,939,808
Freeland ________ -_ Dec. 19, 1933
between said members, a passageway between
2,1842 2
Driftmayer ______ __ Dec. 26, 1939
opposite faces of each member for receiving said 65
lead, said members being sealed together ad~
2,241,761
2,266,925
2,275,967
jacent said lead to retard moisture ?ow along
said lead toward the coil.
3. A sealed coil comprising a bobbin having
end ?anges of which at least one is composed 70
Number
of two plates, a coil of wire on the bobbin be
107,688
tween said ?anges, a lead wire passing between
the two plates of a flange, a passageway between
opposite faces of each plate for receiving the lead
305,694
406,279
90,578
Blaisdell ________ __ May 31, 1941
Verrill ___________ __ Dec. 23, 1941
Keillor __________ __ Mar. 10, 1942
FOREIGN PATENTS
Country
Date
Australia ________ __ June 22,
Great Britain ______ __ Feb. 8,
Great Britain ____ __ Feb, 19,
Switzerland ____ __ Sept. 16,
1939
1929
1934
1921
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