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Патент USA US2405529

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Aug. 6, 1946.
Y G.l P. SMITH
ELECTRICAL CONDENSER
Filed March 5, 1944
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Patented Aug. 6, i946
UNITED STATES PATENT OFFICE
2,405,529
ELECTRICAL CONDENSER
Gail P. Smith, Corning, N. Y., assignor to Corning
Glass Works, Corning, N. Y., a corporation of
New York
Application March 3, 1944, Serial No. 524,896
2 Claims.
(Cl. 175-41)
1
The present invention relates to fixed electri
cal condensers and more particularly to a con
metal foil sheets I6. Each sheet I6 is like sheets
denser wherein the capacitance must be held
within close tolerances.
The prime object of the present invention is a
ñxed condenser whose capacitance can be readily
Ill but projects over the opposite edge of strips
I3 and l5 and serves as the other tab or terminal
of a condenser. A third strip of glass film I'I is
then arranged over sheets I4 in vertical register
with strips I3 and I5. The number of alternate
layers of foil sheets and strips of glass ñlm em
reduced to a predetermined Value.
Another object is a novel method of so mak
ing a ñXed condenser that its capacitance can
ployed is of course determined by the capacitance
be readily reduced to a predetermined value after
of the condensers desired. For the purpose of
simplicity a condenser strip having but three
layers of metal foil has been shown.
To enable one to readily reduce the capacitance
of the completed condenser to a predetermined
standard value, the metallic sheets of the final
assembly,
Other objects and features of the invention will
present themselves in the course of the descrip
tion of the invention.
The preferred embodiment will now be de
scribed as applied to the form of condenser dis
closed in a Bair application for “Condenser and
method of assembly," Ser. No. 524,908, filed con
currently herewith and assigned to the assignee
of the present application.
in the accompanying drawing
2
vertically aligned with strip i3. The next layer
of the assembly is composed of laterally spaced
layer are flagged and each branch of a sheet made
available for separation from the sheet, thus
enabling the capacitance of a condenser to be re
20 duced in one, two or more increments. To provide
Fig. l diagrammatically illustrates a heating
and pressing apparatus by means of which certain steps of the invention may be carried out,
and also shows an assembled strip of condensers
embodying the invention being conveyed into the
the foregoing feature, narrow strips I3 of mica
are arranged on the glass strip Il a small dis
tance inward from the edge over which the final
layer of metal foil sheets are to project, and serve
to prevent a narrow cross-sectional area of the
attached ends of the flagged sections of the final
layer of foil sheets i9 from later becoming bond
ed to the glass strip VI. After placement of sheets
Fig. 2 is a diagrammatic View illustrating a
le on strip I1 a narrow strip 2i! of glass iilm is
suitable arrangement for driving conveying and
arranged to cover those portions of sheets I9
30
pressing rollers associated with the furnace of
projecting to the left (Fig. 5) of strips I8.
Fig. l;
The glass strip may be severed transversely
Fig. 3 is an exploded perspective view of an
between the individual condenser units in any
assembly embodying the invention as prepared
conventional glass severing manner. Applicant
for passage through the furnace;
prefers, however, to employ the thermal shock
Fig. 4 is an elevation of a strip of condensers '
severing method taught and claimed in his ap
embodying the invention; and
plication, Ser. No. 524,897, filed concurrently
Fig. 5 is a perspective View illustrating the
herewith.
As taught by said application, Ni
step of separating a strip of condensers into in
chrome or similar wires 2l are nextarranged on
dividual condenser units`
Referring now to Fig. 3, the assembly as pre- -ï glass strip 25 transverse thereto Wherever it is de
sired to later sever the assembled strip. As illus
pared for passage through the conveyer furnace
trated, the wires 2I are arranged outside the edges
of
1, comprises a strip of sheet metal II of
of the endcondenser pile-ups to trim excess end
dimensions appreciably greater than a strip of
portions of the glass strips therefrom and are
condenser assemblies to be assembled thereon. ‘ also arranged intermediate adjoining pile-ups to
Arranged on strip I I is a chalked asbestos pad I2
separate them from one another. ' Wires 2l and
upon which is superimposed a strip of glass nlm
the underlying assembly is next covered with a
I3. Individual condenser elements or sheets I 4
chalked asbestos pad 22, which is then covered
of metal foil are then arranged in laterally spaced
furnace;
relation on strip I3 with one edge of each sheet
I4 set inward from the edge of a strip I3 and '
with the opposite edge of each sheet projected well
beyond the opposite edge of the strip, the latter
edge of the strip serving as one tab or terminal
of a condenser assembly. A second strip of glass
with a pad 23 of coarsely woven material of glass
or asbestos cloth or the like, and the whole cov
ered by a sheet metal plate 24 and the assembly
placed on those rollers 25 at the left end of the
furnace assembly.
Rollers 25 and pressing rollers 26 and 21 are
nlm I5 is then superimposed en sheets I4 and 55 all driven by a single motor 28 as required to ad
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vance material through the furnace at a uniform
predetermined speed.
i
Specifically the motor 28 is coupled to a gear
reduction unit 35 which, by means of a chain 36,
drives pressing roller supporting shaft 3l in a
clockwise direction while the rollers 25 receive
their drive from shaft 3l through chains 38 and
39. Pressing roller 26 is on «the other hand driven
in a counter-clockwise direction by interposition
of a pair of gears lill in a drive between shaft 3l
and shaft GI carrying pressing roller 26.
The pressing of the assembly is for producing
an intimate void-free bond between the metal
and dielectric layers. The pressure necessary to
accomplish this, of course, depends on the num
ber of layers in the particular assembly being
manufactured. The pressure applicable by roll
ers 25 and 2l has accordingly been made adjust
able by the use of scale beam weighted levers 50
exerting downward pressure on the upper press
ing roller shafts 4 l.
The furnace proper comprises a pre-heating
section 3d, a heating and pressing section 3l , and
an annealing section 32.
As diagrammatically
illustrated, each of the sections 30, 3l, `and 32
contains a pair of electric heating elements. rThe
electric current supplied to the elements of the
respective sections of the furnace is so adjusted
that the temperature maintained Within section
3@ is such that an assembled strip of condensers
attains a uniform temperature near lthe soften
ing temperature of its glass strips by the time it
starts entering section 3l and reaches or slightly
exceeds the softening temperature just before
entering pressing rollers 26 and 2l. The tem
perature of section 32 is so adjusted that the strip
issues therefrom with the glass in a strain-free
condition and at a temperature approaching room
temperature.
The strip, after issuing from the furnace, is
divided into individual condensers or into lat
erally spaced groups by including the Nichrome
wires 2l in `an electric heating circuit, as illus
trated in Fig. 5, whereupon the wires are heated
and severance effected by thermal shock, As
separation is effected, the Nichrome wire also
breaks away from the glass and may be again
used.
As will be appreciated, accuracy of placing
the foil sheets in exact predetermined positions
in the condenser pile-ups is essential if capaci
tance are to be held within a predetermined nar
row capacitance range. With this fact in View,
plate lI may have score lines ll’ to indicate to
the assembler the distance inward from the glass
strips at which the foil sheets are to be place-d.
As a further precaution against shifting of the
foil sheets and glass foil strips, the respective
strips and sheets may be temporarily glued to one
another. With metal plate l I arranged on a suit
ably heated hot plate, diphenyl may be used as
the temporary adhesive, as it will be volatilzed as
the assembly passes through section 35i of the
furnace. If desired, the mica strips i8 and wires
2l may also be temporarily glued to the assem
bly to assure their remaining in place until they
are bonded to the assembly. The `asbestos pads
l2 and 22 and the cloth 23 provide a cushioning
action which compensates for slight irregulari
ties in the glass films and prevents excessive
fracture of glass strips of the assembly while
being subjected to the pressure of rollers 26 and
2l. The chalking of asbestos pads I2 and 22 pre
vents objectional sticking of the glass to the
pads.
While the pressing of the assembly is taking
place, the wires and metal foil are Wet by the
softened glass and becomes thoroughly bonded
thereto.
Obviously, the glass strips of the as
sembly at the same (time become bonded to one
another wherever they overlap the foil sheets
and in the areas between pile-ups. It will be ap
preciated therefore that the strip issuing from
the furnace comprises a unitary body of glass
having imbedded therein and thoroughly bond
ed thereto the metal parts of the assembly.
As will be appreciated, the- transverse flagged
sections of sheets I 9 arranged over the mica
., strips i3 do not bond to the mica. The con
denser capacity, accordingly, can readily be re
duced by removing one or more of the unbonded
portions from a sheet I9. As will be appreciated,
if a greater range of adjustability is desired, the
flagged sheet i9 can be duplicated in the bottom
of the assembly.
What is claimed in the instant application:
l. A condenser assembly comprisingl a pile up
of sheets of fusible dielectric material in the
form of ñlm with metallic elements in the form
of foil arranged between and having portions
overlapped by the respective sheets, said sheets
being in intimate contact with said elements and
being fused to one another in those portions
which overlap said elements, at least one of said
elements being branched and exposed near the
unbranched end by the overlying sheet with
means holding transverse sections of the exposed
portions of the branches separated from the un
derlying sheet of dielectric material whereby such
sections are free for removal from the adjoining
fused on portions of the branches.
2. As a new article of manufacture a con
denser pile-up comprising alternate layers of
metal foil and glass ñlrn bonded to one another,
the alternate layers of metal projecting beyond
different margins of the glass for electrical ter
minal connections and one of the two outside
layers of metal being divided into a comb-like
'» member with the unattached ends of the teeth
covered by glass to a point near their ends of
attachment, and a strip of mica separating a
transverse section of the exposed teeth from the
underlying `glass thereby preventing bonding of
the metal thereto so that fracture of any tooth
can be readily effected to reduce the capacitance
of the condenser.
'
GAIL P. SMITH.
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