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Патент USA US2403457

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July 9, 1946-
Filed Feb, "r, 194?:
F76. /.
FIG. 2
, Maw/Wm“
Patented July 9.9 ‘294$ '
John E. Ranges,_East Rutherford, N. 3., ‘designer
to Bell Telephone Laboratories, Incorporated,
New York, N. Yl, a corporation of New York
Application February '2, 1942, Serial No. 429,936
v; 2Claims.- (c1. 175<--21)
This invention relates to inductive devices and
more particularly to a terminal strip for such
prong 6 passes
of conducting
a hole inmaterial.
the msuiatiug
strip as shown in the dots-dash lines and is then
An object of this‘invention is an inductive de
bent over to contact with the strip. The other
vice having a single piece of insulating material
prong 6’ ?ts into a notch provided in the end of
as a terminal strip or mounting plate which is
the insulating strip as shown in Fig. 3.
?rmly associated with the device without the use
After coil l is wound the insulating terminal
of screws, rivets, etc.
strip 2 is wrapped around the periphery and the
Another object of the invention is a single strip
slits ?tted as shown in Fig. 1, thereby leaving the
terminal strip for an inductive device in which 10 ends of the strip free. If desired, a suitable ce
both ends'of the strip are exposed for attachment
ment or other adhesive may be applied to that
of terminals'thereon.
surface of strip 2 which comes in contact with
To accomplish these objects and others which
the coil. However, such adhesive is not required. ' '
will appear hereinafter, this invention comprises
The ends ‘I of the coil winding or windings are
a coil of one or a plurality of windings about the 15 then brought out and together with vleads 8 are
periphery of which is wrapped a stripv or insulat
. ‘given a few turns around portions 6' of the ter-‘
ing material, The insulating material strip is of
' minals to which they are then soldered. The
a length greater than the periphery of the device
so that the strip would normally overlap. Near
the point of overlapping are transverse slits ex
tending approximately half way across the strip 20
from‘ opposite edges thereof. The ends of the~
strip are interlocked by inserting the unslit por
tion of each end of the strip into the slit in the
other end.
Y The invention will be better understood from
‘ the following description or one embodiment of '
prong 6' is then bent over.‘ ‘
In wrapping the coil winding ends around por
tions 6’ or‘ the terminals, the coil ends are pulled
su?iclently tight m make the ends of the strip
approach as closely as possible to the underlying "
portions of the strip. In other words, the coil
winding ends 1 form anchors for the ends of the
25 strip. For this reason the adhesive mentioned
above is not essential but as stated may be used.
The coil and terminal strip are thenvplaced in
the bottom half 9 of a two-part insulating mate
rial eontainer. The container may be of still.’
Fig. 1 is a perspective view of a toroidal coil to '30 paper, cardboard
similar insulation material.
which the invention has been applied with the
The leads 8 are
closely about the strip
two parts of the enclosing case ‘separated from
through opening
each other and from the coil;
the invention together with the attached drawing‘
- in which:
ill in the bottom half. The upper half oi the
’ Fig. 2 is a view of the terminal strip before
container is also provided with an opening i2
being applied to the coil; and ‘
35 through which the leads pass when the upper
Fig. 3 is an enlarged view of a portion of one
portion is put in place. The upper hall’ ll 01' the
end of the terminal strip and illustrates the man
her in which the terminals are applied to the strip.
In Fig. 1, there is shown a toroidal type coil I
container is ?tted over the bottom half and is
cemented thereto.
After the top of the container is inyplace, the
preferably formed by winding enamel insulated 40 complete assembly is vacuum impregnated with a
wire on a toroidal core of magnetic material. The
suitable ?lling and moisture repellent material;
magnetic material may be of molybdenum perm
The invention has been described as applied to
alloy dust of 400-mesh ?neness compressed into
a toroidal coil but it is obvious that it is equally
the desired shape in the well-known manner.
applicable to a solenoid. It is also obvious that
Around the periphery of coil I is a strip of' 45 the terminal strip need not embrace the entire
insulating material 2. This strip may be of-stiii
external surface of the winding or coll but that
paper, cardboard or similar material and is longer
may be placed at either or both ends of a wind
than the periphery of the coil so that the ends
or any place in between the ends. It is, there
of the strip would normally overlap. At the point
seen. that the invention may be carried out
where the ends of the strip would normally over so
in other specific ways than those herein set forth
lap, slits 3 and 4 are provided as shown more par
without departing from the spirit and essential
ticularly in Fig. 2.
of the invention and the present
At each end of the strip, two terminals 5 area}
embodiment is, therefore, to be consideredv in all
provided. As shown more particularly in Fig. 3,
respects as illustrative and not restrictive and all
each terminal comprises a U-shaped piece or a
so changes coming within the meaning and equiva
lency range of the appended claims are intended
to be embraeed therein.
What is claimed is:
1. An inductive device comprising a coil oi’ wire,
a strip of insulating material around tl'ie‘periph
ery of said coil, said strip having transverse slits
at an overlapping point to permit interlocking oi’
the strip to hold it in position on said coil and-‘to
expose both ends of the strip, terminal leads, and
a conducting terminal element attached to each
of the exposed ends, the ends of said coil of wire
and the terminal leads each being electrically
connected to respectively associated terminal
2. In an electrically inductive apparatus, an ’
electrically conductive winding, a ?at band of
insulating material adapted to pass completely
around the periphery of the winding and to have
overlapping end portions, said band having trans
verse slits at opposite sides at points which per
rnit interlocking oi‘ the band with itself whereby
the band is held in position on said winding with
both its end portions exposed and tree, terminal
leads for said apparatus and electrically conduc
tive terminal elements at‘ each end 0! the band,
said elements extending through the band and
‘around the end margins 01 its free ends and an
electrical connection from each terminal element
tola point in the conductive winding and to a
terminal lead.
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