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Sept. 17, 1946.
` H_ o, BERG
sHIELDEn con.
Filed April 1o, 1943
2,407,916
sept. 17, 1946.
.4131.55.26~~
' 2,407,916
SHIELDED COIL
Filed April 10, 1945
2 Sheets-Sheet 2
Patented Sept. 17, 1946
2,407,915
UNlED STATES PATENT OFFICE
2,407,916
SHIELDED COIL
Howard 0. Berg, Chicago, Ill., assignor to Stew
art-Warner Corporation, Chicago, Ill., a corpo
ration of Virginia
Application April 10, 1943, Serial No. 482,528
5 Claims.
l
(Cl. Z50-16)
2
My invention relates to shielded coils and more
dust core 2S mounted on a screw 35i threaded in
particularly to permeability tuned intermediate
frequency transformers.
the Bakelite end i8 and provided with an eX*
ternal kerf 32 to facilitate adjustment of the core
An object of my invention is to provide a new
lengthwise of the tube l0.
and improved shielded coil which is ci simple 5
The sleeve 2@ is enclosed in a tubular metal
construction and more easily assembled than
shield 34 having an in-turned end Sii which over"
those heretofore known.
Another object of my invention is to provide
lies the end plate it“, and irl-turned fingers «it
which overlie the end plate it whereby the shield
a shielded coil which is cheaper to manufacture
fili secures and holds the several parts in assem
than the coils of the prior art.
10 bled relationship. L-shaped terminals ft2 are
Another object of my invention is to provide
attached to the end plate i8 by rivets dfi. or in
a shielded coil which is more eiiicient for all con
any other suitable manner, and the leads for
ditions of temperature and humidity than are
the electrical coils i2 and i4 are soldered to the
the prior art coils.
inner ends of these rivets, as indicated in
l,
Other objects and advantages will become ap 15 there being four terminals 42 and a separate
parent as the description proceeds.
electrical coil lead soldered cr otherwise secured
In the drawings:
to the rivet for each terminal.
Fig. 1 is a longitudinal, sectional View through
In Fig. '7 1 have illustrated more clearly the
a shielded coil embodying a preferred form of
arrangement of the electrical condensers on the
my invention;
20 tube IE). At one end of the tube it ñlrns iiû and
Fig. 2 is an end view of the coil oi Fig. 1 loolz- '
52 of copper or other suitable metal are sput
ing in the direction of the arrows ii-ÉZ of this
tered ory otherwise formed on the inside and out
figure;
side of the tube. Therñlm Eil
ds around
Fig. 3 is an end view of the coil shown in Fig. 1
the end of the tube and a short c tance down
and is taken looking in the direction of the 25 the outside thereof to permit an electrical con»
arrows 3_3 of Fig. 1;
ductor to be soldered or otherwise attached to
Fig, 4 is a transverse, sectional view taken on
this ñlm. A gap ¿iii is located between the a<.l-~
the line 4_4 of Fig. 1;
jacent ends or the films so that each film forms
Fig. 5 is a side elevation of the coil shown in
one plate of a condenser
the tube constitutes
Fig. 1;
30 the dielectric between these plates.
Fig. 6 is a partial, transverse, sectional View
The other end of the tube 113 is similarly pro
vided with inner and outer sputtered :films 55
and 5B, respectively, which form the plates of a
showing a detail of construction and is taken on
the line ë-â of Fig. 3;
Fig. '7 is a longitudinal sectional view of the
tube, electrical coils and condensers.
Fig. 8 is a wiring diagram showing the elec
trical connections for part of a typical radio cir
cuit incorporating my invention.
second condenser.
These condensers are con
35 nected in parallel with the electrical coils I2 and
I4, as indicated in Fig. 3 of the drawings, and
where the tube lil is used, it is unnecessary to
provide my shielded coil with outside condensers
In the drawings I have illustrated a thin walled
as is the usual practice.
tube l0 of Bakelite, ceramic or other suitable in 40
This Fig. 8 shows part of a typical radio cir
sulating and non-magnetic material on which
cuit embodying my shielded. coil. In this ñgure
the electrical coils i2 and I4 are wound. This
the electrical coil i2 and condenser Eil-52 are
tube is clamped between a pair of end plates Iii
arranged in parallel and interposed between the
and I8 of Bakelite or other suitable insulating
plate @t of a radio frequency tube e2 and the
and non-magnetic material which serve to center
positive pole of a B battery or its equivalent.
the tube lil and electrical coils l2 and ill in
The coil lli- and condenser {i5-’siii are also'in
spaced relation to a sleeve 20 preferably formed
parallel and are interposed between the grid 6d of
of iro-n dust and a suitable binder, such as pow«
a second radio frequency tube 56 and a grounded
dered Bakelite.
The electrical coil i2 is provided with an iron 50
dust core 22 mounted on a screw 24 threaded in
the end plate I6.
The screw 24 has a kerf Z5
in its exposed end to facilitate adjustment oi
the core 22 lengthwise of the tube lil. The elec
trical coil I4 is similarly provided with an iron
terminal indicated at 6K3.
In assembling my new and improved coil, I
have found it most advantageous to form two
sub-assemblies which are subsequently brought
together to make the completed shielded coil.
One such sub-assembly is formed by inserting
screw 24 in end plate i6 and adjusting the screw
2,407,916
4
to bring the core 22 to approximately the proper
position. Thereafter sleeve 2E] is aflixed to end
plate i6 by applying a suitable cement, such as
Glyptal, between the contacting surfaces of these
parts, whereupon the end plate Iii, core 22 and
sleeve E‘û are inserted in shield 34 to form one
sub-assembly.
The other sub~asse1nbly is formed by inserting
screw 3S into end plate I8, attaching tube l0
to end plate i8 by means of Glyptal, or other
suitable cement, and attaching the leads for the
electrical coils-cr for the electrical coils and
condensers, as the case may loe-to the terminal
rivets M to complete the second sub-assembly.
This second sub-assembly is then inserted. in the
sleeve 2U and shield 34 and the iingers 40 of this
shield are then bent over to the position shown
in Fig. l to complete the entire assembly.
I have found that my new and improved
2. A shielded coil of the class described, com
prising a dielectric tube having an inner and an
outer copper ñlm at each end thereof, each in
ner film and its adjacent outer film forming a
separate electrical condenser, electrical coils
wound on said tube on the uncoated portion
thereof, a core for each of said coils, said cores
being movable lengthwise of said tube, a mag
netic sleeve enclosing said coils and tube, end
plates maintaining said tube and sleeve in spaced
co-axial relationship, and a metal shield sur
rounding said sleeve.
3. A shielded coil of the class described, com
prising an insulating and non-magnetic tube
having an inner and an outer metallic film at
each end thereof, each inner film and its adja
cent outer film forming a separate electrical con
denser, an electrical coil wound on said tube on
the uncoated portion thereof, an iron dust core
shielded coil is particularly efdcient under all 20 for said coil, said core being movable length
wise of said tube, an iron dust sleeve enclosing
conditions of temperature and humidity where
coil and tube, means maintaining said tube
the interior of the coil is sealed against atmos
and sleeve in spaced co-axial relationship, and
phere. This can be effective by placing Glyptal
a metal shield surrounding said sleeve and hav*
or other cement between the engaging surfaces
ing portions overlying said end plates.
or the end plates and sleeve and by placing ce
A shielded coil of the class described, com
ment around the screws il!! and 3i] at the outer
prising an insulating and non-magnetic tube
surfaces of the end plates i6 and i8. These
having an inner and an outer metallic film at
screws should. only be sealed after the final ad
each end thereof, each inner film and its adja
justment of the cores 22 and 28 has been coin
pleted.
While I have described my invention as being
particularly adapted for intermediate frequency
transformers, my invention is not limited to
such use and shielded coils embodying my in
vention may be used for other purposes. My
30 cent outer film forming a separate electrical con
denser, electrical coils wound on said tube on
the uncoated portion thereof, an iron dust core
for each of said coils, an iron dust sleeve en
closing said coils and tube, end plates maintain
invention is not limited to the particular details
f ing said tube and sleeve in spaced co-axial rela
tionship, and a metal shield surrounding said
shown and described, but may assume numerous
other forms and includes all variations and modi
sleeve and having portions overlying said end
plates.
iications falling within the scope of the appended
5. A shielded coil of the class described, com
claims.
40 prising a ceramic tube having an inner and an
outer metallic film at each end thereof, each in
I claim:
ner film and its adjacent outer film forming a
l. A shielded coil of the class described, com
separate electrical condenser, electrical coils
prising a non-.magnetic and insulating tube hav
ing an inner and an outer metallic film at each
wound on said tube on the uncoated
portion
end thereof, each inner iilm and its adjacent 45 thereof, an iron dust core for each of said coils,
said cores being movable lengthwise of said tube,
outer film forming a separate electrical con
an iron dust sleeve enclosing said coils and tube,
denser, electrical coils wound on said tube on the
end plates sealing the ends of said sleeve, a
uncoated portion thereof, an iron dust core for
metal shield surrounding said sleeve and having
each of said coils, said cores being movable
portions overlying said end plates, and terminals
for said coils and condensers attached to an end
closing said coils and tube, end plates main
plate.
taining said tube and sleeve in spaced co-axial
HOWARD O. BERG.
relationship, and a metal shield surrounding
said sleeve and having portions overlying said
end plates.
55
lengthwise of said tube, an iron dust sleeve en
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