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Патент USA US2134392

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Oct. 25, 1938.
L. J. BARWOOD
2,134,392
FILM CUT-OUT
. Filed Aug. 16, 1935
2 Sheets-Sheet l
Oct. 25, 1938.
,__ _,_IBARWOQD
2,134,392
FILM CUTLOUT
Filed Aug. 16, 1935
"~ 30
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L EON J. 5/112 WOOD
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2334,3952.
Patented Oct. 25, 1938
UNITED STATES PATENT OFFICE
2,134,392
FILM CUT-OUT
Leon Joachim Barwood, Cambridge, Mass.
Application August 16, 1935, Serial Nb. 36,489
‘11 Claims.
(o1. 200--1l8) '
may be disposed between and separating the
The present invention relates to ?lm cut-outs,
a new and improved
and its object is to provide
shall
be
simple
in construction,
?lm cut-out that
cheap to manufacture, very e?icient in operation,
and exceedingly uniform in its dielectric charac
teristics and consequent break- down, voltage.
According to the invention disclosed in Letters
September 17, 1935,
Patent No. 2,014,409, granted
are
the conducting members 0 f the ?lm cut-outinsu
opening
of
a
ring-shaped,
disposed in the
lating member the friction of the
conducting members, so as to contact with their
non-bowed-out peripheral portions, thus provid
ing an air chamber 18 between the insulating disc in
peripheries
of
or the conducting members against the wall
parts
the opening being sui?cient to hold the meter
together as a unit, particularly if the dia
of the conducting members is somewhat larger
15
The wallof the open—
than that of the opening.
aped to aid this holding
ing may be torus-sh
6 and the centrally-bowed-out portion of each
disc 2 and 4. As illustrated in Figs. '7 and 8,
however, the separating ?lm 6 may be omitted
and the contacting, peripheral, inner surfaces
of the metal‘ members 2 and 4 may be covered
with a suitable insulating coating 23 of an oxide
of the metal.
may be embodied also in the modification illus
trated by Figs. 3 and 4. As is also described in
the said Letters Patent, the discs 2 and 4 and
the ?lm (-2 may be held together mechanically, as
a unit, merely by the peripheral edges of the discs
2 and 4 rrictionally engaging the torus-shaped
action.
An object of th e prese nt invention is to provide
an improved ?lm cut-out of the aboveedescribed
greater curvature of
or concave wa‘1l22 of the opening of a ring
shaped or annular, stiff-?bre, insulating disc 8.
According to a feature of the present inven- .
with a
character provided disclosed
in the said letters
the torus than is
tion, the curvature of the torus-shaped wall 22
is considerablyenlar'ged, so as substantially to
Patent.
The
Letters Patent discloses also a modi?
insulating members and
cation comprisin g two
to improve upon this modi?
a further object is
cation also.
ects
Other and further obj
will be explained
pointed out
hereinafter and will be particularly
in the appended claims.
will be more fully described in
The invention the accompanying drawings, in
connection with an elevation of a ?lm cut-out
which Fig. l. is
4
embodying the present invention; Figs..2 and
taken upon larger scales
are diametrical sections
of Fig. l and 4-4 of Fig. 3, re
on the lines 2-44.‘
of the arrows;
spectively, looking in the directions
Fig. l of a modi?ca
Fig. 3 is a view similar to
rts ' of
6 are perspectives of pa
tion; Figs. 5 and shown
in Figs. 3 and 4, Fig. 5
the embodiment
away,
for clearness; Fig. 7
being partly broken
Fig.
l
of
a further modi?ca
is a view similar to
scale,
tion; Fig. 8 is section, but upon a larger
taken upon the line 8-—8 of Fig.7, looking in the
arrows; and Fig. 9 is a perspec~
directions of the the modi?cation shown in Figs.
tive of a part of
'1 and 8.
As described in the said Letters Patent,
cut-out may comprise two preferably circular
2
or disc~shaped, centrally b0wed~out, members
such
and 4, of conducting ma terial, like metal,
from each other in
as aluminum, but insulated
in Figs. lto 4,
desired manner. As illustrated
disc-shaped, insulating, thin film 5
a circular or
55
of tissue paper, silk or any other desired ma
19
The oxide-coating modi?cation
terial,
increase the height of its peripheral edges or
projections 24. This may be eiiected in any suit
able manner, as by means of a burring roll (not
shown) vthat moves along the exterior surfaces
of the ring 8, near, and along the circumference
of, the opening, to produce a groove 26, thereby
upsetting or plowing up or ‘spreading the ma 30
terial of the insulating ring 8 into the opening of
the
ring.
'
-
~
~
The grooves 26 are not cuts in the material of
the ring 8. The plowing up of the material of
the ring is, ‘rather, attended by a compression
of the material in the grooves 26, thus hardening 35
and strengthening the material in the neighbor
hood of the edges or projections 24. The edges
or projections’need not, of course, be continuous,
they may bedisposed at a plurality of separated
positions along the circumference of the opening 40
of the ring 8. The projections 24 thus engage
the conducting discs 2 and 1i at their sides, near
their peripheries only, more positively than in
the said Letters Patent to hold the discs 2 and
4 more effectively in the opening of the ring 8. .
As is further described in the said Letters
Patent, the ring 8 may be replaced by two ring
shaped. or annular, stiff-?bre, insulating discs
iii and i2, as shown in Figs. 3 to 8. The discs
50
ill and 12 may each be provided with an annular
recess l4 surrounding its opening, the similar
openings of the discs iii and i2 being opposed to
each other. 'The peripheries of the discs 2 and 4
maybe held together mechanically, as a unit, in
these recesses M, the walls‘ of the recesses M
5.5
2
2,134,392
the opening, the projections being alined, the
projections on one of the similar members having
a recess, and means cooperating with the other
10
in corresponding, alined
projections 28 and 30 and through recesses 39 in
the insulating ?lm 6. The rivets I6 need not
as illustrated,
15 but they may be formed members,
integral with, or pressed
out from, one of the discs l0 and I2.
l0
the opening,
having alined the projections being alined and
recesses, and means
15
members disposed as a unit between
members and the opening.
8. A ?lm cut~out comprising two insulated con
ducting members, two similar members each hav- -
extending
through- corresponding recesses for mechanically
holding the similar members together with the
30
the opening with projections between which the
conducting members and the means are held to
openings opposed to each other and with the con
ducting members disposed as a unit between the
similar members and the opening.
9. A ?lm cut-out comprising two conducting 30
members, an insulating ?lm disposed between
and separating the conducting members, two sim~
ilar‘insulating members each having a similar
35'
as to extend
positions along its exterior surfaces near the
40
45
gether as a unit.
11. A ?lm cut-out comprising two conducting
4. A ?lm cut-out comprising two conducting
50
insulating ?lm disposed between
and separating the conducting members, and a
member having an opening in which the con
ducting and the insulating members are disposed
12. A ?lm cut-out comprising two insulated
conducting members, two similar members each 56
having an opening and an annular recess sur
gether as a unit in the opening.
5. A ?lm cut-out comprising two insulated con
ducting members, two similar members each hav
with the other member and disposed in the recess
for mechanically holding the
‘
'
65
ing, the conducting members having recesses for
receiving the projections.
said one member.
6. A ?lm cut-out comprising two insulated con~
ducting members, two similar members each hav
75 ing an opening and a projection extending into
13. A method of making an insulating ring for
a ?lm cut-out comprising plowing up the mate
rial of the insulating ring into the opening of the 70
ring.
14. A method or making a ?lm cut-out com
prising plowing up the material of an insulating
ring into the opening of the ring at a plurality
75
3
2,134,392
of positions along its exterior surfaces near the
opening to provide the wall of the opening with
projections, and inserting insulated conducting
members in the ring to cause them to be held
together as a unit in the ring by the projections.
UK
15. A ?lm cut-out comprising two insulated
conducting members, and insulating means en
gaging the conducting members at their edges,
10
and also at their sides near their peripheries
only, for holding the conducting members and
the insulating means together as a unit.
16. A film cut~out comprising two conducting
members, an insulating ?lm disposed between
and separating the conducting members, and
means engaging the conducting members at their
edges and also at their sides near the peripheries
only, for holding the conducting members and
the insulating ?lm together as a unit.
1'7. An insulating ring for a ?lm cut-out, the
material of the ring being displaced so as to
extend into the opening at a plurality of posi
tions along its exterior surfaces near the open
ing to provide the wall of the opening with pro
jections between which insulated conducting 10
members may be held together as a unit in the
I‘ll'lg.
LEON J. BARWOOD.
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