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Dec. 31, ‘1946.
a. R. HERMANN
23139563
ELECTRIC CIRCUIT INTERRUPTER AND DISCONNECTING DEVICE
Original Filed Dec. 13, 1941 I
2» Sheets-Sheet
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Inventor‘;
Benjamin R?ermahh,
by WW6.‘ jw‘éwi
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His At’cornew
Dec. 31, 1946.
B_ R HERMANN
2,413,5G3
ELECTRIC CIRCUIT INTERRUPTER AND DISCONNECTING DEVICE
Original Filed Dec. 13, 1941
14
”
2 Sheets-Sheet 2
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Inventor“:
I
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BenJ'amin R Hermann.
( |.__.__\___,'
2844A“!
‘
His Attornglj.
I Patented Dec. 31, 1946' ; _
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'
2,413,515?
‘UNITED ."STATES'" PATENT lorries
2,413,563
-
Y
“
‘ELECTRIC CIRCUIT INTERRUPEL'EB AND
DISCONNECTING DEVICE
’
Benjamin B. Hermann, Lanesborough, Mass, as-i _
signor to General Electric Company, a corpora
tion of New York
Original application December 1s, 1941,Serial a...
422,901. Divided and ‘this application June lli,v
1
1943, Serial No. {190,824
6 Claims.
(Cl. 200-114)
My invention relates to electric disconnecting
devices and more particularly to a disconnecting _
device which may be readily interchangeable with
a fuse device.
*
This application is a division of my application
Serial No. 422,901, ?led December 13, 1941, en
titled Electric circuit interrupter and disconnect
ing device, and assigned to the same assignee as
the present invention.
Many forms of fuse cutouts have been sug— 10
gested heretofore for protecting electric circuits
2
lated fuse link pull-out means, of my invention,
Fig. 4 is an enlarged sectional view taken on line
4-4 of Fig. 1, Fig. 5 is a side sectional view simi
lar to Fig. 1 showing the disconnecting device of
my invention in the closed circuit position, Fig.
' 6 is a view similar to Fig. 2 showing‘ the rear of
the cover including the disconnecting blade of
‘Fig. 5, and Fig. 7 is a sectional view taken on line
1-1 of Fig. 5.
'
-
Referring now to the drawings, Ill indicates a
housing or casing of porcelain or/similar insulat
or controlling electric circuits. Devices of this
ing material having an integrally formed electric
sort commonly have a housing provided with a
creepage barrier l0’ which separates two station
front opening with a cover hinged to the housing
for closing this front opening. Usually a pair of 15 ary terminal assemblies generally indicated at l I
and I2, respectively, mounted-within housing Ill.
terminals or contacts are mounted within the
The
uppervand lower terminal assemblies H and
housing and the fuse tube is mounted on the
i2, except for one additional part associated with
cover and provided with contacts to engage the
the upper terminal assembly II and described
contacts or terminals in the housing when the
cover is closed.
Such cutouts are also provided 20 hereinafter, are identical "in construction and,
accordingly, only. the upper one of these terminal
with indicating means and, upon operation of
the fuse device, movement of the fuse tube or of
assemblies will be described in detail and the cor
responding
parts of the assemblies II and I2 will
the cover or of both the cover and the fuse tube
be designated by the same reference numerals.
results.
'
Terminal assembly H comprises a U-shapedter
My invention is concerned with an electric cut V25
minal support l3 which is adapted to be ce
out and disconnecting device for interrupting
mented
into apair of pockets II in the housing I0,
larger blocks of power than such ‘devices have
only one of which is visible in Fig. 1 since the
been commonly used for heretofore.
I
other is immediately behind the one shown, which Accordingly, it is an object of my invention to
pockets
are separated by a fin not discernible in
provide a new and improved cutout and discon
the drawings but which are interconnected by
necting device combination for controlling larger
means of an opening or notch in this separating
blocks of power than such devices have commonly
?n.
This interconnection is provided to facil
been used for heretofore.
'
itate the pouring of the cementing material.
A further object of my invention is to provide
which is preferably.‘ poured hot through the lead
a new and improved cutout device which may
entrance opening 16 in housing 10. By using a
readily be converted to a disconnecting device,
plurality of pockets into which the cementing ma
which takes up a small amount of space, provides
terial is poured, a stronger construction is pro
wide separation between the contacts, and gives
vided than if U-shaped terminal supports l3
an indication of the condition of the circuit
while, at the same time, remaining protected 40 were cemented into a single large pocket in hous- '
ing l0. Terminal assembly I I further includes
against the weather, such as ice, snow, or rain.
Further objects and advantages of my inven
tion will become apparent as the following de
a terminal I‘! shown in enlarged sectional view in
Fig. 4 and described in greater detail hereinafter.
An extension l8 on terminal I1 is provided so that
terminal Il may be rigidly supported by U-shaped
terminal support I 3 by means of bolt IS. The ex
tension "! is provided with lugs 20 to engage the
edges of the U-shaped terminal support l3 so that
scription proceeds and the features of novelty
which characterize my invention will be pointed
out with particularity in the claims annexed to
and forming a part of this speci?cation.
For a better understanding of my invention,
the heavy lead coming through lead entrance
reference may be had to the accompanying draw
» opening l6 for engagement with terminal II will
ings in which Fig. _1 is a side sectional view of my 50
not cause the terminal to swivel about bolt [9
improved fuse cutout with the fuse intact and
when the heavy lead is being formed or bent ex
the cutout .in the closed position, Fig. 2 is a view
ternally of the housing l0.
of the rear of the cover of the fuse cutout device
Terminal assembly I I further includes a pair
shown in Fig. 1, Fig. 3 is an exploded view of a
portion of the fuse cutout including the articu 55 -of U-shaped contact clips 2| which are electri
cally connected to extension l8 of terminal I 1 v
2,413,568
1 through a ring-shaped contact 22, the contact
clips being clamped to the extension | 8 by bolt
19. In order to insure good contact at contact
clips 2], I provide 'a plurality of spring strips 23
which are riveted as at 24 to U-shaped termi
nal support l3 and are arranged to provide spring
backing means for contact clips 2|. The upper
4
within fuse tube 45 includes a fusible element and ~
a strain wire arranged in parallel with a ?exible
conductor connected to the lower terminal of the
fusible element.’ In Fig. 1, only the ?exible con
ductor 49 of the fuse link is visible which in
cludes a plurality of cables in order to carry the
high currents involved. As‘will be understood by
those skilled in the art, the fuse including the
j fuse tube 45 and the fusible link, only the ?exible
manner'thereto and the purpose of which will be 10 conductor 49 of which is visible in Fig. l, oper
ates on the expulsion principle to interrupt the
set forth hereinafter.
circuit therethrough. ‘
The terminal |1 shown in enlarged sectional '
The fuse tube 45 is supported on door 40 and is
view in Fig. 4 includes a cylindrical lead-receiving
assembled with the door by thrusting the fuse
portion or passageway‘ 26. A long shoe 21 ?ts
tube 45 to which upper contact and cap 48 have
into the lead-receiving portion 26 and is adapted
been assembled through opening 44 in barrier 43.
to be depressed into engagement with the lead,
A pair of pins 56 integrally connected to upper
not shown, by means of a pair of screws 28 so
fuse contact 46 are arranged to be‘ inserted in the
as to clamp the lead between one wall of lead
recesses 42 in cover 40 so as properly to position
receiving portion 26 and the shoe 21. Suitable
means for preventing the screws 28 from being 20 the fuse tube 45. Contact 41 which includes an
opening 41' is then slipped over fuse tube 45 and
completely removed from the lead-receiving por
the fuse tube is locked into position by means
tion 26 may be provided. In order to hold the
of fuse support 5| having an opening 5|’ therein
shoe 21 out of the way when putting a large lead
' which is slipped over the lower end of the fuse
into terminal-receiving portion 26, I provide re
tube 45 and screwed to the cover 40 as at 52. By
tracting means comprising spring 29 which is
allowing a small amount of clearance between
connected to the shoe 21 by means of a guide
pins 50 and recesses 42 and between opening 44
pin 30, the lower end of which is spun over as
in barrier 43, and fuse tube 45, the upper fuse
shown at 3| into a depression 32 in shoe 21. A
contact 46 may be made slightly ?oating on cover
suitable washer 33 prevents the spring from drop
ping into the opening or aperture 34 in terminal‘ 30 40 so as to line up properly with the contact clips
2| of upper terminal assembly “even when the .
receiving portion 26, which opening 34 must nec
cover 4|! does ‘not squarely seat in position on
essarily be large enough to allow for angular dis
housing l0. Fuse support 5| having opening 5|’
placement of pin 30. In order to permit spinning
therein for accommodating fuse tube 45 is pro
over of the end of pin 30, a suitable opening 35 is
vided with a pair of trunnions 53 for engaging the
provided in the wall of lead-receiving portion 26
notches 39in hinge supports 31, thereby providing
diametrically opposite the opening 34 for pin 30.
a pivotal support for cover 40 and fuse tube 45.
To the back of the housing or casing l0, there
terminal assembly“ also includes a latch clip
25 which is riveted or fastened in any suitable
Lower contact 41 is mounted on fuse tube sup
is secured a mounting bar 36 for attachment of
port 5| by means of a‘pin 54 passing through trun
the cutout to a suitable supporting structure, not
shown. This mounting bar 36‘ is preferably ce_ 40 nions 53. By allowing su?icient clearance between
these parts, contact 41 may have a ?oating action
mented into an external recess 36' in the housing
It in the same manner as are terminal supports
relative to cover 40 so as to line up properly with
contact clips 2| of lower terminal= assembly l2.
l3.
In order to prevent premature disengagement of
In addition to terminal supports l3 and mount
i'ng bar 36, a pair of hingesupports 31 (Figs. 1, 5 45 ‘the trunnions 53 from notches 39 when opening
the door 46 of the fuse cutout, I provide on lower
and '1) are cemented into corresponding recesses
contact 41 9, lug 56 which engages with the ex
38 in the lower portion of housing I 0, one on
either'side of the housing. These hinge supports
tension |8 of the lower terminal assembly l2 and
effectively prevents such premature disengage
31, .only'one of which is visible in Fig. 1, each in
ment. Lug 56 is provided with a thumb screw 51
clude a notch 39 within which suitable trunnions
to be described hereinafter are mounted for piv 50 extending therethrough and having a substan
tially rectangular clamping shoe 58 mounted on
otally supporting the door of housing I0.
In order to provide a closure for housing III, I
the otherend of the ‘thumb screw for clamping
provide a cover or door 40, preferably made of a
the ?exible conductor or cable 49 against pro
molded insulating compound or the like which
jection 59 integrally associated with contact 41.
' includes an integral, handle or eye 4| which may 55 In order to provide good electrical contact be
,be either grasped manually or engaged by a suit
tween contact clips 2'|_ and contacts 46 and 41,
able form of switch stick to open and close the
each of the contacts 46 and 41 is provided with
cover 40 with respect to housing "I. Cover 40 is
raised restricted contact surfaces 60 which are
provided with a pair of recesses 42 only one of
preferably formed of a metal, the oxide of which
which is discernible in Fig. 1, since these recesses 60 does not substantially interfere with the conduc
are in the same horizontal plane. The cover
tion of current. Silver, for example, is a suitable
40 is also provided with a barrier 43 which over
‘metal for such purpose since its oxide is rela
laps the creepage barrier l0’ and thereby lessens '
tively unstable physically, and consequently,
the possibility of ?ashover between contacts by
raised
restricted contacts of silver are very satis
virtue of hot conducting gases passing therebe 65
tween, having an opening 44 therein which has
factory although any other suitable metal may
su?icient clearance to accommodate a fuse tube '
be used.
'
In order to provide prompt fuse link terminal
separation in_ that range of fault current where
for engaging with the U-shaped contact clips 2|. 70 there is not sui?cient expulsion action caused by
the arc in fuse tube 45, I provide an articulate
Mounted within fuse tube 45 is the conventional
45 which may be of conventional construction
having a‘ pair of terminals or contacts 46 and 41
fuse link, preferably of the buttonhead type,
which is held in position by cap 48 screwed to the
upper part of fuse tube 45. As will be‘understood .
by those skilled in the art, the fuse link mounted
fuse-link pull-out means which takes up a very
small amount 'of space and yet which provides
for a wide separation between the fuse-link ter
minals. This articulated fuse-link pull-out means
2,413,503 ,
comprises a pair of rigid members or arms 6| and
62. Arm 6| has'a forked portion 63 which is piv
otally mounted to support 6| at 64. A suitable
spring 66 associated with support 64 and shown
in the exploded view of Fig. 3 is provided to bias
arm 6| in a counterclockwise direction with ref
erence to the view shown in Fig. 1 so as to tend to
assume the dotted position shown. Arm 62 is pro
vided with a drumlike portion 66 which houses a
driving spring 61. This drumlike portionis piv
‘I2 is substantially identical with cover 46 of Fig. l.
Fastened to the lower inside portion of cover 12
as at 14 is a=support 15 substantially identical
with support 5| of Fig. 1 except that the support
is slotted at 16 to permit pivoting of a disconnect
ing blade 11. Support 15 is provided with trun
nions ‘I8 identical with the trunnions 53 of Fig. 1
which are adapted to be mounted in the notches
39 of hinge supports 31. Blade 11 is pivotally
10 mounted to support 13 by means of a pin 19 pass
otally mounted as at 66 to arm 6| with the spring
61 arranged to tend to‘ cause clockwise rotation of
ing through trunnions 18. A suitable spring 86' is
mounted in a recess 8| in the lower portion of
arm 62 about pivot 66 with reference to Fig. 1.
blade TI and presses against pin 19 to tend to
A suitable stop member 69 is provided on drum
66 of arm 62 to engage with a corresponding stop 15 bias blade 11 upwardly but to permit a. downward
movement of blade 11 for reasons enumerated
member ‘I0 on arm 6| to limit the clockwise ro
hereinafter.
tation of arm 62 about pivot 68 and cause arm 62
As in Fig. 1, in order to prevent premature dis
to assume the dotted position indicated in Fig. 1
engagement of trunnions 18 from notches 39 of
when unrestrained by conductor 49. Arm 62 ‘is
providedwith a forked end ‘II to accommodate the 20 hinge supports 31, I provide an extension or pro
jection 82 on disconnect blade 11 which is adapted
conductor 49. When the fuse device of Fig. 1 is
to engage with the extension l6 of lower terminal
loaded, arm 62 is rotated in a counterclockwise di
assembly |2 s0 that,v upon opening the door 12
rection with reference to arm 6| in the manner
of
the disconnect cutout, disengagement of trun
of a jack-knife moved to the closed position and
nions 18 and notches 39 cannot occur until a
arm 6| is rotated in a clockwise direction about
predetermined opening position of door 12 has
been attained.
pivot 64 with reference to the view of Fig, 1.
Thereafter conductor 49 is passed within fork ‘H
and over drum 66, as best shown in Figs. 1 and 2,
and is clamped between clamping shoe 58 and pro
jection 59 so as to hold the articulated fuse-link
pull-out means comprising arms 6| and 62 in the
position indicated in Figs. 1 and 2. With the
30
drum or spool-like portion 66 arranged over
spring 61, molten metal contained in the arc
blast expelled from the bottom of fuse tube 45
faces 60 of Figs. 1 and 2.
is prevented from injuring spring 61. Also, by vir
r
'
knob 86 suitably fastened to door 12 and having
an enlargement 81 thereon for cooperating with
a notch 88 in the upper end of disconnect blade
11. As mentioned above. spring 8| tends to bias
are spring biased, the heavy cables making up
conductor 49 are pulled from the end of fuse tube
45 at high speed. Since the forked portion 1| of
arm 62 will tend to follow the conductor 49 rather
disconnect blade 11 in an upward direction to
than slide therealong upon blowing of the fuse,
maintain the enlarged portion 81 of knob 86 in
it follows that friction and binding are reduced
'
-
In order to hold disconnect blade ‘IT in a par
allel position with respect to door ‘I2, I provide a
' tue of the double arms 6| and 62, both of which
toaminimurm
Disconnect blade 11 is preferably a solid con
ductor having spaced contacts 83 and 84 thereon
for engaging with the respective upper and lower
contact clips 2| of cutout housing i6. In order
to insure good electrical contact, contacts 83 and
84 are preferably provided with raised restricted
contact surfaces 85 similar to the contact sur
the latched or engaged position with respect to
the notch 88 of disconnect blade 11. The discon
.
In view of the detailed description included
nect cutout illustrated in Fig. 5 is not designed
to open the circuit while the circuit is carrying
full-load current but it will interrupt small cur
above, the operation of my fuse cutout device will‘
be obvious. As soon as the fusible section of the
link melts, the strong spring pressure applied by
rents such as a transformer exciting current.
springs 65 and 61 to arms BI and 62, respectively.
causes the remaining portion of the fuse link
and particularly conductor 49 to be pulled quickly
out of the tube 45 to insure rapid arc interruption
even at low current. After operation of the fuse
device, the arms 6| and 62 extend downwardly in
In order to prevent burning of the contact 85'
and associated contact clips 2| under such con
ditions. disconnecting blade 11 is provided with
an arcing tip 89 at the upper end thereof.
When the circuit is to remain disconnected for
a time. the conducting disconnect blade 11 may be
moved downwardly upon bodily removal of door
72 from housing l6 against the compression of
spring 8| to unlatch notch 88 from knob 86 and
the dotted position shown and serve as a very
satisfactory indicatingmeans to show clearly that
the circuit is open. By use of such an articulated
pull-out means, a sufficiently long operating stroke
blade 11 may be pivoted to hang downwardly in
is obtained to pull the conductor 49 completely‘
out of the fuse tube without requiring any large 60 the dotted position shown in Fig. 5 and the door
12 may be reclosed to prevent snow and ice from
space within the cutout housing to accommodate
entering the housing Ill. The disconnecting blade
the same in the unoperated position.
hanging downwardly in the dotted position shown ~
will provide a suitable indication that the circuit
through the cutout is open.
The fuse cutout described heretofore may read
ily be converted to a disconnect type of cutout by
replacing door 46 with a door including a dis
65
connecting blade as shown in Figs. 5, Sand '7.
The corresponding parts of the housing are iden
tical with those shown in Figs. 1 to 4 and are, ac- .
'The contact clips 2| engaging with contacts 83
and 84 maintain the blade and consequently the
disconnect door 12 in the closed position when the
cutout is arranged for carrying current, How
cordingly, designated by the same reference nu
merals. Referring now to Figs. 5, 6 and 7, I have '70 ever, in order to hold the cutout in the closed
indicated a disconnect cutout in which the hous-> -v - position when the disconnect blade 11 is rotated
to the dotted position shown and contact clips
ing I6 is closed by means of a door or closure
2| no longer engage with contacts 83 and 84, I
member ‘12, preferably made of a molded insulat
provide contact clip 26 associated with terminal
ing compound or the like, and including an in
assembly H‘ in housing l6 for engaging the en
tegral handle or eye ‘I3. In this respect, cover
largement 61 of knob 66 and insuring that cover
2,418,563 ‘
7.
12 remains in the closed position under such
ternatively supporting said conductor ,fromsaid
conditions.
door in a position electrically isolated from at
'
The operation of the indicating disconnect cut
least one of said contacts anddepending from '
out illustrated in Egs. 5, 6 and '7 will be obvious
in view of the detailed description included above.
While I have shown and described what I at
said housing to indicate anopen-circuit condi
tion between the contacts in said housing.
,
4. In, an electric disconnect device, the combi
present consider the preferred embodiment of my
nation of a housing, a door for closing an open
side of said housing, spaced contacts mounted in
invention, it will be obvious to those skilled in
said housing, a rigid electrical conductor pivotal-v
the art that various changes and modi?cations
may be made without departing from my inven 10 ly supported at one end of said door, latching
means for the other end of said‘ conductor for
tion, and I therefore aim in the appended claims
holding ‘said conductor‘ in' substantially parallel
to cover all such changes and modi?cations as
fall within the true spirit and scope of my in-, . relationship with said door, means including a.
vention.
‘
i What I claim as new and desire to secure by
Letters Patent of the United States is:
,
1. In an electric disconnect device, the com
bination of a housing, a door for closing/an open
spring associated‘ with the pivotally supported
end of said conductor'for causing said latching
means to be operative, saidconductor being so
positioned with respect to said door and said
housing as to complete an electric circuit between
said contacts in said housing when the open side
side of said housing, spaced contacts in said hous
ing, a support mounted on said door for relating 20 of said housing is closed by said door, and means
. for alternatively supporting saidconductor from
said door to said housing, a rigid electrical con
said ‘door in a position electrically isolated from
duc'tor pivotally‘ mounted on said support for in
at least one of said contacts and depending from
- terconnecting said contacts in said housing, and‘
said housing to indicate an open-circuit condi
means for alternatively supporting said conductor
on said support on said door in a position elec 25 tion between the contacts insaid housing. '
5. In an electric disconnect device, the combi
trically isolated from at least one of said con,
nation of a housing, a door for closing an open
tacts and depending from the bottom of‘ said
side of said housing,_spaced contact assemblies in
housing to indicate an open-circuit vcondition be
said housing, a pair of hinge supports having
tween the contacts in said housing even though
the open side of said housing is closed by said 30 trunnion-receiving notches therein supported in
door.
‘
.
’
2. In an electric disconnect device, the com
bination of a housing, a door for closing an open
said housing, a member mounted at one end of
said door and having a pair of trunnions there
on for pivotally supporting said door to said
casing when said trunnions engage said trunnion
side of said housing, spaced contacts mounted
in said housing, a rigid electrical conductor piv 55 receiving notches, a rigid electrical conductor
pivotally mounted on said member for intercon
otally supported from one end of said door, latch
necting said contacts in said housing when said
ing means for the other end of said conductor for
trunnions engage trunnion-receiving notches
holding said conductor in substantially parallel
and said door closes the open side of said hous
relationship with said door, said conductor being
so positioned with respect to said door and said 40 ing, a lug associated with said conductor for en
housing as to complete an electric circuit between
gaging with one of said contact assemblies to
said contacts in said housing when the open side
of said housing is closed by said door, and means
for alternatively supporting said conductor from
said door in a position electrically isolated from
at least one of said contacts and depending from
said housing to indicate an open-circuit condi
tion between the contacts in said'housing.
prevent premature disengagement of said trun-g
nions from said trunnion-receiving notches upon
' opening of said door, and means for alternatively
supporting said conductor in a position electrical
ly isolated from at least one of said contact as
semblies and depending from the bottom of said
housing to indicate an open-circuit condition be
3. In an electric disconnect device, the com- ‘
tween the contact assemblies in said housing.
bination of a housing, a door for closing an open 50
6. In an electrical switching device, the combi
side of said housing, spaced contacts mounted
nation comprising a housing, a door for closing
an open side of said housing, spaced contacts
in. said housing, a rigid electrical conductor piv
otally supported at one end of said door, latch
mounted in said housing, an electrical conduct
ing means for the other end of said conductor
ing means pivotally mounted on said door and
for holding said conductor in substantially par- .
arranged to complete the electrical circuit be
allel relationship with said door, means asso
tween said contacts in said housing when said
door is in the closed position, and means in-'
cluding said electrical conducting means for ex
ciated with the pivotally supported end of said
conductor for causing said latching means to be
operative, said conductor being so positioned
tending outwardly from said housing under open
with respect to said door and said housing as 60 circuit conditions of said switching device when
said door closes the open side of said housing to
to complete an electric circuit between said con
indicate the condition of said switching devce.
tacts in said housing when the open side of said
BENJAMIN R. HERMANN.
housing is closed by said door, and means for al
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