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Патент USA US3026405

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March 20, 1962
J. K. HOWELL ET AL
3,026,395
CIRCUIT INTERRUPTERS
Filed July‘ 10. 1959
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March 20, 1962
J. K. HOWELL ET AL
3,026,395
CIRCUIT INTERRUPTERS
Filed July 10, 1959
4 Sheets-Sheet 2
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March 20., 1962
J. K. HOWELL ET AL
3,026,395‘
CIRCUIT INTERRUPTERS
Filed July 10. 1959
4 Sheets-Sheet 5
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United States Patent()
3,626,395
Patented Mar. 20, 1362
2
1
tions to remove potential from the contact structure
of the interrupting element of the load-break discon
necting switch, when the switch blade is in the closed
circuit position.
3,026,395
CKRCUIT INTERRUPTERS
I
John K. Howell, Kirkwood, Mo., and Floyd A. Bean,
Denver, Colo., assignors to Westinghouse Electric Cor
poration, East Pittsburgh, Pa., a corporation of Penn
A further object of the present invention is the pro
vision of an improved load-break disconnecting switch,
in which the operating arm, extending externally of the
sylvania
Filed July 10, 1959, Ser. No. 826,190
5 Claims. (Cl. 200—146)
parallel disposed interrupting element, and operated by
the switch blade, in addition, carries current from the
This invention relates to circuit interrupters in gen 10 switch blade to the interrupting element so as to avoid
the necessity of utilizing an auxiliary contact arm, which
eral, and more particularly to arc-extinguishing structures
must be picked up by the switch blade near the end
and also to load-break disconnecting switches.
of the opening stroke.
At the present time, outdoor disconnecting switches
Another object is the provision of an improved toggle
equipped with arcing horns are sometimes used to inter
rupt small currents, such as transformer magnetizing 15 operated mechanism for the inetrrupting element of a
load-break disconnecting switch.
currents and line charging currents. These switches have
Further objects and advantages will readily become
a substantial interrupting ability under favorable con
apparent upon reading the following speci?cation, taken
ditions; however, if a wind is blowing when the inter
in conjunction with the drawings, in which:
ruption is attempted, there is a considerable danger of
the arcs being blown across phases to create a line-to
20
FIGURE 1 is a side elevational viewof the load
line fault. The only available device‘ for such inter
ruption, which is completely dependable, is a high-voltage
circuit breaker. The high cost of such circuit breakers
break disconnecting switch of the present invention,
to interrupt magnetizing and charging currents, and with
the open-circuit position;
shown in the fully open-circuit position;
FIG. 2 is an end elevational view of the load-break
disconnecting switch, as viewed from the right hand end
has led to the considerable use of air-break switches
in spite of the hazard involved. There has been a con 25 of FIG. 1 taken substantially along the line II——II of
FIG. 1, again the contact structure being illustrated in
tinuous need for a low-cost device with ample capacity
more dependable operation than an air-break switch.
There have been designed low-cost circuit breakers,
usually built in conjunction with disconnecting switches,
to ?ll the need. These devices, however, are essentially
circuit breakers with fault-current interrupting ability.
Having this ability, the devices are necessarily complex
FIG. 3 is a considerably enlarged vertical sectional
view taken through the toggle-operating mechanism for
30 the interrupting element of the load-break disconnecting
switch of FIG. 1, the operating and contact elements
being illustrated in the fully open-circuit position;
FIG. 4 is a view somewhat similar to FIG. 3, with un
and costly. The need is still great for a simple and in 35 important housing parts omitted, illustrating the position
of the several parts in the fully closed-circuit position
expensive high-voltage interrupter for load currents only.
of the interrupter;
Such a device is preferably in the form of an addition
FIG. 5 is a vertical sectional view taken through the
to existing disconnecting switches to increase their in
interrupting element of the load-break disconnecting
It is, therefore, a general object of the present inven 40 switch of FIG. 1, illustrating the position of the con
tact parts in th efully open-circuit position thereof;
tion to provide a simple and low-cost, load-break dis
terrupting ability and dependability.
connecting switch, which will safely interrupt relatively
FIG. 6 is a view similar to that of FIG. 5, but show
ing the fully closed-circuit position of the contact parts;
FIG. 7 illustrates a modi?ed type of interrupting struc—
relatively high-voltage circuits.
I
‘
Additional requirements, which. are desirable in a 45 ture, which may be substituted for the interrupting struc
ture of FIGS. 5 and 6, the contact parts being shown in
load-break disconnecting switch, are that the interrupt
the closed-circuit position;
ing contacts part at high speed to prevent restriking, par
FIG. 8 is a view similar to FIG. 7, but showing the
ticularly when interrupting line-charging current. Pref
position of the contact parts in the fully open circuit
erably such contact opening speed should be independent
of the speed of operation of the manual operating handle. 50 position; and,
FIG. 9 is an enlarged detail view of the end of the
Secondly, the addition of the interrupter to the discon
contact arm.
necting switch must not unduly increase the operating
Referring to the drawings, ‘and more particularly to
effort of the disconnecting switch, and ?nally the de
FIG. 1 thereof, the reference numeral 1 generally desig
vice should preferably operate dependably when cov
small currents, and which is capable of also interrupting
ered with snow and ice.
nates a load-break disconnecting switch including a base
2, upon which upwardly extend insulator stacks 3, 4 and
It is, therefore, an additional object of the present in
5. The end insulator stacks 3 and 5 are stationary,
vention to provide an improved load-break disconnecting
whereas the center insulator stack 4 is rotatably mounted
switch, which will not only be highly effective in its
with a suitable bearing 6 and rotatably actuated by a
interrupting performance, but also it will require rela
crank-arm 7. '
tively little mechanical effort to operate.
60
The end insulator stack 5 supports a conducting mem
Still a further object of the present invention is to
ber, or a line terminal connection 8 for the interrupter,
improvise an improved interrupting structure which will
and also a housing 9 enclosing a suitable mechanism for
not only have particular applicability as applied to a,
rotating the disconnecting switch blade 10 vertically. The
load-break disconnecting switch, but, in addition, is suit
able for general application, wherever effective circuit 65 mechanism, enclosed within the housing 9 and operated
interruption is desirable.
'
by rotation of the crank-arm 7, forms, per se, no part of
our invention, and therefore is not speci?cally illustrated.
A further object of the present invention is to provide
Reference may be had to United States Patent No. 2,363,
an improved operating mechanism for a load-break dis
connecting switch.
360 issued November 21, 1944 to Herbert L. Rawlins,
A further object of the present invention is the pro 70 and assigned to the assignee of the instant application,
for a complete description of the mechanism enclosed
vision of an improved load-break disconnecting switch
within housing 9 and also within housing 11.
incorporating an auxiliary isolating switch, which func
3,026,395:
4.
,Asymentioned, the, rotation of the insulator stack 4, by.
movable contact 37, constituting .the lower extremity. of
the crank-arm 7, effects functioning of the mechanism
within the housings 9, 11 to-thereby effect upward, open
a contact rod 38, which extends upwardly, and has a
threaded engagement, ‘as’ at”, to a movable spring seat
40. An opening ‘accelerating compression spring 41 is
, ing,(swinging;disconnecting'motiontofythevswitch bladeil‘ll
the?fully openipositifonf indicated by the full, linesin
' Qllt‘Qf; electricalengagement Withthe jaw: contacts ‘1310
disposed withinga recess 42 provided in the porcelain
casing 16,,seating- at its lower end‘against a.radially in
FIG. 1.
wardly extending ?ange 43 andiagainst the upper movable ,
The§end insulatoristack: 3: not‘ only ?xedly supports ‘the
spring-seat‘ 46. The movable spiingtseat 40 is, in addi
jaw; contact 13, but; also 'supportsian ‘insulating iplate ‘ 14,
tion, preferably connected, as at 44, to a link-45, which
which in, turn,suppo_rts a:laterallyldisposed interrupting
is connected'to the'operating? mechanism 46 (FIG. 3),
element, generally; designated:byithe'reference numeral
15. The interruptingrrelement 15': functions, toLinte‘rr'upt
the, circuit; extending, through the. disconnectingv switch 1,
such interrupting action. taking place interiorly-within a
weatherproof casing 116,;so that noarcingétake?s place, or
which functions to cause, contact separation and engage
ment, as hereinafter described.
_
_
7 p I
The‘i-rodésh'aped' movable contact seiner; only carries
the: annular arcing - contact’- 3'7," but; also’; has; a threaded
15 engagement, as - at 4'7, with" an linsulating‘lifollower,‘ ‘ g‘e'rf
is visible externally of the interrupting’elernenttl5.
e'rally» designated by their‘efer'ence‘ numeralié?: Prefer
Surmjountingtheweatherproof casing v16, which is pref
ably 3 the insulating followeriél? ‘is formed ‘from a‘? suitable '
erably, formed 10f porcelainris ' a' mechanisnrcompartment
gas-evolving material, such'as ?beryor-the‘ilike'g-andvhas
17. Extending laterallyl externally of‘; the mechanism
formed upon its" outer surface“ onef-or more‘ spiral'grooves
housing 17 'is a main operating-shaftl?, to, the‘outer free 20 49, which function to‘ restrict arcing? _'Ihe ?b‘er'follower
end of;w,hich is ?xedly. secured ‘tan op‘eratin'g‘con'tact arm
A pair ofresilientsalloy discs>20 are isecuredto the
01.11;?!‘ end of‘the-operating contact‘arrnl 191, as more clearly
“moves with the contact rod'38, being" carried thereby-L
As shown in FIG. 5,‘~during~theiopeningoperation‘the
‘ 19.
shown in‘ FIG.~9: The resilient alloy, discs 20‘ have-'laper- ,
tures 21 therethrough, through whichiexten‘ds; a'th-readed
stud;2,2; extending laterallylofttheyouter freeiend-‘of the
?ber follower 48fmoves, with very‘. slight'clea'ra'nc'e; up?
wardly: into ‘a- closely con?ned-insulating tube-50} also
preferably formed of a" suitable?-gaseevolvingirnaterial;
such as l?ber, or the'like.‘
contactann ‘19-. A spacer sleevel23lsurrounds '- the-:' stud
,
>
'
i
opening,‘
As awresultiof
operation‘,the‘foregoing‘construction,
when the- arcing? contact during
375 moves‘
from-the closcd‘positionishown lHT‘FIGE 6lto?th‘e~ may
open ‘position; shown jin'FIGi‘iL because‘- of "the? slight
clearance‘ between follower 48T'an'd‘enclosing-tube1550, the
22 andjspaces the resilient discs-120v a‘ minimum-distance
apartr Nuts 24, threaded uponiithe lstud122; ?xedly secure
the discs 20 in place, in an adjustable-manner, so that ‘the 30
outerpcontacting;en'dv~2»5 Tof the'lswitchllblade _10 may make
good, resilientrcontactingiengagementwith the discs 20' to
established arc drawnbetweencontaets'i 3_6,~"37>'will1 be
avoid-iarcingrtherebetweeni,.as described more‘ fully here
forced‘
to assume 'the‘i- path 'ofT-the'on'el' of‘3 more of the
inafter;
I
.
35
From the description’ thus far, it Lis "apparent that during
the closingoperation the-1 switchhblade 10;; rotates in a
clockwise, direction about. they pivotal ‘ mounting- 26,‘ en'
spiral grooves 49_-provided along? the 'outer- surfaceeof fiber
follower 48. Obviously, therefore; the initiia-l'iarc length.
extending‘lr'ather directly between$contacts~36§~37 will'be
considerably increased‘ in length, by ‘being-1compelled-‘to
follow. the‘ spiral ior'; helical f path; as "de?nedfby7the1one
gagingrthe vcontact arm'_19- and! rotatinglthe same" about
the shaft axis 18 until the disconnecting’ switch blade 10
, reaches its‘fullyclosed-position;as indicated by the'dotted
or more spiral‘or'h'elica‘l 2grooves!” providedbyl’the ?ber
follower
lines_;21»of FIG. 1; Generally,‘~during“agclosing-operaL
48';
_
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k
‘
_'
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’
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As shown in FIGS; 5 and 6, the ?ber tube 50Iisthre‘adi
tion, the structure: is such,‘ that following freeing,‘ dise
edly' secured; as at‘ 51,1 tojaicylindricali? contact support
engagement between; the contact end 125; of ‘ switchfblade
52, preferably; formed from'ia'st'eel-‘tube, which is threadf‘
Iii-from the-discs 20 'iniv the position 28"of FIG'Q l; resilient
edly, secured,‘ as; at ‘53, to an ‘annular upstanding"v boss
' means, as hereinafter‘described, causes the'contact'arm 45 portion-T54iof‘the-basei35i _Th_e porcelain casing 161 is
1,91‘to, ,rnoveqback to fthe'position‘29 of FIG; 1, wherein it
likewise threadedly secured,‘ as‘at 55;: to the annular ~
boss? portion 54, i a‘! gasket EG-“beir'ig interposed‘ therebe-y
is v interposed tin: the I path of - opening" movement of j the
Switchblade; ‘l0 zduringnasubsequent' opening operation‘.
An auxiliary isolating switchil3?fis' provided‘; including
a;piyotally§ mounted-icontact ‘bar? 31, pivotally mounted,
50
as-.qat;32,_to,a?xed'tbracketsupport133L3 The ‘right hand
end of the contact bar 31, as viewed in FIG; 2,5 makes
below ‘the / inwardly! extending" ?ange " portion ‘ 43 ‘ of ' the
separable contacting“ engagement ‘with’ -a- stationary contact
porcelain?‘casing-16}
34, which is connected, by a strap connection 35, to the
55
stationary contact structure'36-(FIG. 5) of ‘the interrupt
ingqelement 15;
The isolating'switch 30 functions such‘ '
thatpwhen' the‘, outer‘ freefend 125 ‘of disconnecting ‘switch
blade; 10 strikes .theleft hand endof rotatably mounted
contactbar 31, as viewed inAF-IG, 2, in the fullycclosed~
circuitposition of‘the-‘disc'onn‘ecting switch 1,‘ separation
_
contacts 60.‘ ‘Each? ?nger contactincludeshn arching?’
_ referably, resilient ‘ flexible‘, current
,
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_>
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_
p
_
The interrupting actionas described ‘aforesaid ‘is ‘highly
effective; an‘d'iqui'ckly" brings about interruption‘pof, the.
65
arc!’ initially ii drawn between“ th’e'cont'acts ‘336, .37.i Gas,"
which is evolved- from the ?ber follower-48f and frdni the‘
?ber enelosingftub'e‘
Sin/Listened‘‘ dewnwardly; “along 'thé‘
helical2 grooves; 49‘ ‘and and ‘an expansion 1 chamber '66;
70
formed by the lower end of support tube/5'2. The icoirvni
pression sprin'gf4l’insures" rapid,‘ contact separation and
arc"extinction‘.'
The interruptingelement 15 of the disconnecting switch
‘Fen certain applications, where it may-jbiei
lfwill now be explained. With" reference to. FIGS. 5 and
in‘, the‘ clow e tolerances‘ between the :?ber : tube; 50;
6;:it1will bet-‘noted that cooperating with ‘the ?nger-‘type
relatively stationary» contact structure" 36 c is " an ‘annular
_
tip; portion 61,1 and la ~resilientl leaf-ist‘ee‘l ‘spring: portion
62, which is biased inwardly by aco‘mpression' spring 63
6lliiwithithe‘conducting-tube52f
indicated by the dotted lines 27 ofIAFIG. l, the interrupt
ing {element 15 ~ and "also cause radio interference.
v
collectors? 65tjelect'rically"interconnect the‘ leaf springs
tipn 35;;and the contact structure 36 (now closed) within
ingpelement 15; isv completely'electrically» isolated from
the jaw- contact 13 to eliminatecharging currents,‘ which‘
might deteriorate" the ?ber associated with‘ the interrupt
_
extending through apertures 64 provided‘iinjthe surround~
occurs between the contacts-31, 34 of-the auxiliary isolate
the interrupting element 15.~ As ‘a‘result, in the fully‘
'
The contact structure ‘36 includes "a plurality of??nge‘r
60 ingli steel? tube 552;
ing switch 30 to remove potential from the strap connec-'
closed-circuit position.of¥the~disconnecting'switch 1, as
At’ the‘ upper:- endi' of the" ?ber sleeve Si) {is ‘threaded-1y
secured,ras at157,‘ a'guivdei'rin'g'f?g, which is" surmounted
by? ai‘ire‘sil'ient'isupport ‘washer’ 59, positioned immediately
75,
ujspijraled? erronéwér rod-‘d8, re‘quiredétolforceg
the"'arc"drawn“betweenwcoritacts"36, 37 in‘the one or V
3,026,395
5
more spiral grooves 49am alternate interrupting arrange
ment to alleviate such design problems is set forth in
FIGS. 7 and 8 of the drawings.
With reference to FIGS. 7 and 8, which respectively
illustrate the closed and the open-circuit positions of a
6
to provide an expulsion of gas ‘along the one or more
spiral grooves 83 to quickly bring about extinction of
the arc therein. Arc extinction quickly occurs because
of the cumulative effect of the deionizing in?uences.
The operating mechanism 46 for the interrupting ele
again a weatherproof casing 68, preferably composed of
porcelain, is provided. In this particular instance, the
ment 15 of FIG. 1, or for the modi?ed interrupting ele
ment 67 of FIGS. 7 and 8, will now be described. With
reference to FIGS. 3 and 4 of the drawings, it will be ob
is a metallic condenser tube 74, carrying ‘a relatively
stationary contact structure 75 at its upper end. The
abuts a stationary stop 1016. The left-hand end of the
toggle link 101, as viewed in FIG. 3, is pivotally sup
stationary contact structure, generally designated at 75,
may include a pair of resilient ?ngers 76, supported by
ported, as at 1117, to a bracket 1118, which extends inward
1y from the side wall 109 of the mechanism housing 17.
a bracket portion 77 from the inner surface of ‘the con
25 The right-hand end of the toggle link 1612, as viewed in
modi?ed interrupting element 67, it will be noted that
served that the main operating shaft 18 extends laterally
porcelain casing 68 is supported upon an apertured base
plate 69 with a resilient gasket 71) interposed there-be 10 through the side wall 94 (FIG. 1) of the mechanism hous
ing 17. A slot 95 is provided axially along one side of
tween. Apertures 71 are provided through the base
the main shaft 18, into which the nose 96 of a cam pawl
plate 69 forthe venting of gas from an expansion cham
97 is urged by a spiral spring 98. The cam pawl 97 is
ber 72, provided adjacent the lower end of the modi?ed
pivotally mounted, by a pin 99, to a toggle-operating cam
interrupting element 67. If desired, a condenser ele
ment, not shown, could be associated with the apertures 15 plate 160, which is slidably supported upon the main shaft
18. ‘A pair of toggle links 101, 102 are interconnected
71.
by a knee pin 103, and collectively constitute a toggle 104,
Extending upwardly interiorly within the porcelain
which moves overcenter, in the closed-circuit position of
casing 68 is ‘an insulating tube 73, composed of any
the device, as indicated by the dotted lines 105. In the
suitable insulating material, such as, for instance, poly
ethylene. Disposed interiorly ofrthe insulating tube 73 20 overcenter position of the toggle 104, the toggle link 102
ducting tube 74 by a plurality of rivets 73.
Cooperating with the contact ?ngers 76 is a movable
contact rod 79, carrying an insulating follower rod 80
therewith. Preferably the follower rod 811 is formed
FIG. 3, is pivotally connected, as at 110, to a movable
spring seat 111, which is guided laterally within a guide
tube 112, supported from the side wall 113 of the mecha
nism housing 17 . ‘Disposed within the guide tube 112, be
from a suitable gas-evolving material, such as ?ber. As 30 tween the movable spring seat 111 and a stop 114, is a tog
gle-compression spring 115, which is compressed in the
shown, the lower end of the conducting rod 79 termi
overcenter position of the toggle 104, as more clearly
nates in an arc-resisting contact 81 capable of resisting
shown in FIG. 4 of the drawings.
A link 116 is also connected to the pin 110. The other
In this modi?cation of the invention there is provided
a stationary insulating ?ller member 82, preferably com 35 end of the link 116 is pivotally connected by a pin 121
with a bell crank 117, stationarily supported at a ?xed
posed of a suitable gas-evoiving‘material, such as ?ber,
pivot 118, provided by a support bracket 119. Thus, one
and having one or more spiral or helical grooves 82
arm 120 of the ball crank 117 is pivotally connected by
formed upon its outer surface. The ?ller member 82
the pin 121 to the link 116. The other arm 122 of the
is closely enveloped, as shown, by a surrounding insulat
ing tube 84, likewise preferably composed of a suitable 40 bell crank 117 is pivotally connected, as at 123, tothe
link 45, the lower end of which is pivotally connected,
gas-evolving material, such as ?ber or the like. Prefer
as at 44, to the upper end of the conducting operating rod
ably, there is provided very slight clearance between the
38. The helical compression spring 41 of FIGS. 5 and 6
?ller member 82 and the surrounding enclosing tube $4.
is diagrammatically indicated in FIGS. 3 and 4 as being‘
An annular arcing ring 85 seats upon a shoulder portion
86 provided adjacent to the upper threaded end 87 of 45 disposed between the lower plate 126 of the mechanism
housing 17 and an upper movable spring seat 40.
the conducting tube 74. The construction is such that
A ?exible connector 128, indicated in FIG. 3, electrical
the lower threaded end 88 of enclosing tube 84 threadedly
ly connects the upper end of the conducting operating rod
engages the upper end of the conducting tube 74. A
38 with the conducting mechanism housing 17. An ad
second upper arcing ring 89 is provided at the upper
end' of the ?ber tube 84 immediately below a conducting 50 justable pawl release 129 is secured to a wall 130 of the
mechanism housing 17, as shown in FIG. 3.
plate 90, which constitutes a portion of the mechanism
FIG. 4 illustrates, fragmentarily, a sectional view taken
housing 17.
‘
through the operating mechanism 46 in a different vertical
In the closed-circuit position of the interrupting ele
plane than the plane illustrated in the sectional view of
ment 67, as shown in FIG. 7, the movable conducting.
rod 79 electrically bridges the lower ?ngers 76 of the 55 FIG. 3. More particularly, with reference to FIG. 4, it
‘ will be noted that the main operating shaft 18 has a sec
lower relatively stationary contact 75 with the upper
ond pawl engaging slot 131 provided axially along its outer
contact ?ngers 91, which constitute a portion of the
surface. The nose 132 of a toggle-release pawl 133 is
upper relatively stationary contact structure, generally.
biased by a spiral spring 134 encircling the pin 135, about
designated at 92. To effect an opening operation, suitable
mechanism, hereinafter described, effects rapid upward 60 which the release pawl 133 is pivotally mounted. This
pin 135 is carried by an arm 136, which is slidable upon
opening movement of the contact rod 79. The insulating
the main shaft 18, and is pivotally connected, as at 13-7,
follower rod 80, preferably formed from ?ber, moves
adjacent its outer free end, with a movable toggle break
upwardly with the contact rod 79, being carried there
ing arm 1318. As shown in FIG. 4, the lower end of the
with, througha restricted arcing passage 93, disposed
toggle breaking arm 138 has a hook portion 139 which is
between the spiraled grooved ?ller member 82 and the
arranged to engage the knee pin 103 of the toggle 104
surrounding ?ber tube 84.
>
when the latter is in the toggle overcenter position, as in
The arcing, which is established between the lower
dicated by the full lines 140 of FIG. 4.
end 81 of the contact rod 79 and the relatively stationary
To effect a disengagement of the nose 132 of the release
contact structure 75 within the restricted ‘arcing passage
93 is compelled, by the presence of the movable ?ber 79 pawl 133 at a proper time during the opening operation, ,
there is provided a pawl-release stop 141, secured to the
follower 86, moving with contact rod 79, to be reestab
side wall 130 of mechanism housing 17.
'
lished through the longer spiral arc path, as de?ned by
Fixedly secured to, and carried by, the main operating
the provision of the one or more grooves 33. The evolu
shaft 18 is an arm 142, which strikes, in abutting manner,
tion of gas from the ?ller 82, from the surrounding tube
84, and also from the ?ber follower rod 80 all contribute 75 a pivotally mounted spring seat 143, pivotally connected, \
arc erosion.
3,026,395
9
10
connecting switch application. The arc is compelled to
assume a lengthened path, and is quickly extinguished by
expulsive action.
Second, the provision of the auxiliary isolating switch
other end of the casing structure including a mechanism
housing enclosing an actuating means for said pair of
separable arc-establishing contacts, a rotatably mounted
actuator arm extending laterally of said mechanism hous
ing and engageable with the free end of said switch
blade means during both its switch-opening and switch
30 removes potential from the interrupting element 15
in the closed-circuit position of the device so as to elimi
nate deterioration of the ?ber and to prevent radio inter
ference. Third, a novel cam-operated toggle mechanism
is provided to quickly bring about contact separation,
closing movements, the current path through the switch
tact arm between the cam housing 11 and the mechanism
establishing contacts, cam means having a releasable
blade means during the opening and closing movements
traversing said rotatable actuator arm, said actuating
and to permit the use of a single external contact arm 10 means including a toggle linkage for effecting opening
and closing movements of said pair of separable arc
19, without the necessity of employing an auxiliary con
connection with said rotatable actuator arm to straighten
housing 17, as shown in Lingal US. Patent 2,769,063.
said toggle linkage to effect thereby closing of the arc
Other features of the invention are important in assuring
15 establishing contacts during the closing operation of the
smooth and effective operation.
Although there have ‘been illustrated and described
speci?c interrupting structures, and the application there
switch blade means, and toggle-breaking means having a
releasable connection with said rotatable actuator arm
of to a novel load-break disconnecting switch, it is to be
clearly understood that the same were merely for the
for breaking said toggle linkage during the opening ro
tative movements of the switch blade means, whereby
purpose of illustration, and that changes and modi?ca 20 the electrical circuit through the load-break disconnect
ing switch is made and broken interiorly of said casing
tions may readily be made therein by those skilled in the
structure and not at said switch blade means.
art, without ‘departing vfrom the spirit and scope of the
3. A load-break disconnecting switch including a pair
invention.
We claim as our invention:
of spaced line terminals, swinging movable disconnecting
1. In a load-break disconnecting switch having a pair
of stationary conducting line terminals, a swinging mov
switch blade means pivotally supported adjacent one of
said line terminals and having the free arcuate end of the
able connecting switch blade pivotally mounted adjacent
pivotally supported switch blade means making contacting
engagement with the other line terminal, operating means
one of said line terminals and making contacting en
for effecting swinging opening and closing movements of
gagement with the other line terminal, operating means
for effecting arcuate movement of the free end of said 30 the pivotally supported switch blade means, an arc-ex
tinguishing interrupting device stationarily supported ad
movable disconnecting switch blade into and out of con
jacent said other line terminal and including casing struc
tacting engagement with said other line terminal to com
ture, a pair of separable arc-establishing contacts disposed
plete or open the electrical circuit therebetween, an in
interiorly of said casing structure, said interrupting device
terrupting element stationarily mountedat one end ad
jacent said other line terminal and including casing 35 having one end thereof supported adjacent said other line
structure, a pair of separable arcing contacts disposed
terminal and the other end thereof extending away from
interiorly of said casing structure for effecting are ex
said other line terminal and adjacent the opening path of
tinction interiorly of said casing structure, an oscillatable
movement of the free end of the pivotally supported
actuating arm pivotally mounted adjacent the other end
switch blade means, said other end of the casing structure
of said casing structure and making abutting engage
including a mechanism housing enclosing an actuating
ment with the free arcuately movable end of said piv
means for said pair of separable arc-establishing contacts,
otally mounted disconnecting switch blade during the
a rotatably mounted actuator arm extending laterally of
opening and closing movements of the switch, actuating
said mechanism housing and engageable with the free end
means for effecting opening and closing movements of
of said switch blade means during both its switch-opening
said separable arcing contacts and connected to said 45 and switch-closing movements, the current path through
oscillatable actuating arm, the combination therewith of
the switch blade means during the opening and closing
an insulating support for stationarily supporting said in
movements traversing said rotatable actuator arm, said
terrupting element adjacent said other line terminal, an
actuating means including a toggle linkage for effecting
auxiliary switch disposed externally of said casing struc
opening and closing movements of said pair of separable
ture and electrically interconnecting one of said separable 50 arc-establishing contacts, said toggle-linkage moving to an
arcing contacts with said other line terminal, said aux
over-center position in the closed position or‘ the arc
iliary switch being actuated by the free end of the dis
establishing contacts, means de?ning an over-center stop
connecting switch blade, and the auxiliary switch being
arranged to electrically connect said one separable arc
for said toggle linkage, cam means having a releasable
connection with said rotatable actuator arm to straighten
ing contact to said other line terminal during switch 55 said toggle linkage to effect thereby closing of the arc
opening movement and to electrically isolate said one
establishing contacts during the closing operation of the
separable arcing contact and said other line terminal in
switch blade means, and toggle-breaking means having
the closed-circuit position of the disconnecting switch.
a releasable connection with said rotatable actuator arm
2. A load-break disconnecting switch including a pair
for breaking said toggle linkage during the opening rota
of spaced line terminals, swinging movable disconnect 60 tive movements of the switch blade means, whereby the
ing switch blade means pivotally supported adjacent one
electrical circuit through the load-break disconnecting
of said line terminals and having the free arcuate end
switch is made and broken interiorly of said casing struc- ‘
of the pivotally supported switch blade means making
ture and not at said switch blade means.
contacting engagement with the other line terminal, op
4. A load-break disconnecting switch including a pair
erating means for effecting swinging opening and closing 65 of spaced line terminals, swinging movable disconnecting
movements of the pivotally supported switch blade means,
switch blade means pivotally supported adjacent one of
an arc-extinguishing interrupting device stationarily sup
said
line terminals and having the free arcuate end of the
ported adjacent said other line terminal and including
pivotally supported switch blade means making contacting
casing structure, a pair of separable arc-establishing con
tacts disposed interiorly of said casing structure, said 70 engagement with the other line terminal, operating means
for effecting swinging opening and closing movements of
interrupting device having one end thereof supported
adjacent said other line terminal and the other end
thereof extending away from said other line terminal
and adjacent the opening path of movement of the free
end of the pivotally supported switch blade means, said 75
the pivotally supported switch blade means, an arc-ex
tinguishing interrupting device stationarily suported ad
jacent said other line terminal and including casing struc
ture, a pair of separable arc-establishing contacts disposed
gasses
,
_
.
r
‘a
11..
,
.
172-,
.
interiorlylof vsaid-casingestructure, said 'interi'uptingideviceij
having- one end thereof supported adjacent saidfoth'er line
plete or open the electrical circuit therebetweemuan-r V
terminal‘ and the other end “thereof ' extending away, from.
interrupting element 'stationarily mounted at one; end ad
said other lineterminal andfadjacent the opening path of?
I jacent said other line terminal and includingicasing struci
movement ‘of! the free end’ of the- pivotally supported
ture, va pair of separable arcing contacts-disposed interiorly;
switch gblade'lmeans, said otherend of the casing structure
including- a mechanism; housing enclosing» an actuating‘
means for said pair of separable arc-establishing contacts,
a7rotatably~ mounted actuator'arm extending laterally. of
saidmechanism housing and engageab-le with the‘free end
of said switch blade means duringfboth its switch-opening,
of said casing structure tore?iecting arc extinction interior
1y, of said casingstructure, an oscillatable- actuating, arm'
10
connecting switch-blade during the opening and;closing
> and switch-closing movements, the current path through‘
movements of the switch, actuating'means lfor e?ecting:
theswitch- blade means during. the opening: and closing,
> openingiand; closing movements of said separable ‘arcing
contacts and connected to saidptoscillatable actuating arm,
movements traversing saidi‘rotatable actuator arm, said
actuating‘ means includingfa toggle linkage for eifecting
opening and closing movements-0t said pair of separable
15
the’ combination therewith of’ anlinsulating- support for
stationarily ‘supporting said interrupting element - adjacent
saidother line- terminal, an-auxiliary switch disposed ex- 7
arc-establishing contacts, a main operating shaft for sup-'
porting said actuatorv arm, a toggle-operating cam plate
ternally: of said casingstructure-and electrically inter-l
rotata-bly¢mounted' on said vmain operating'shaftand have
ingfacarn'pawl pivotally mounted thereon, means de?ning‘
a'slot along‘ said main operatingnshaft for engaging said
pivotally mounted adjacent the other end of said'casingg
structure and making, abutting engagement with-the free,
arcuately movable vend of~said pivotally mounted dis~>
connecting one of said separable arcing contacts with- said ‘
20 other line terminal, - said auxiliary switch including‘ a- '
pgivotallyl-moulntedt cont-actarm and being-actuated by the;
cam-pawL'the. cam plate camming, said toggle linkage-to
a- straightened position to‘ effect thereby, closing of the;
free end of the disconnecting switch blade, and thee-auxil
iary switch being arranged; to electrically connect said
oneseparable‘arcingqcontact to said other line terminal
during switch opening movement and to electrically isolate)
said »-one~separable~ arcing: contact 'and said other line ter
' arc-establishing:contacts during the closing, operation - of;
theswitch blade means, arpawl-release for releasingjsaid-i
cam- pawlat a~predeterrninedypoint in the closing opera-_,
tion, and togglebreakingmeans having-a releasable con-L
minal in-the closed-circuit position‘ of~the'disconneeting>
nection with saidtrotatable actuatorrarm for breakingsaid~-v
SWllICh'.‘
'
toggle linkage during-the opening rotative movements ofi . r
the switch blade‘ means,~»whereby- the electrical circuit;
30
through the ‘load-‘break disconnectingswitchis made ‘and?
References-Cited in" the ?le of Ithis patent 1
UNITED STATES‘PATENTS
broken interiorly of-said' casingv structure andrnotat said!
switchnblade means.
V
1,953,615}
5.. In a; load-break disconnecting switch :having, a pair‘
2;223,975'
of stationary» conducting» "line terminals, a swinging imov 35 2,469,203'
able disconnecting'switch blade pivotally mounted adja
2,671,144
cent one of-said line terminals and making contacting
2,838,636:
engagement with the "other line‘ terminal, operating *means
for‘ effecting arcuate» movement 3 of_ the free- end» of -said‘—
movable disconnecting» switch- bladefintoan'di out ' of: con
4:0
King _________________ __ Apr; 3; 1934‘
‘ Travers ____________ __'___ Dec. 3, 1940
Palme et al _____________ __‘May.-3,21949‘
Dickinson' _____ __'__’__'_;__ Mar. 2,1954?
Schwager ___________ _~__ June 10, 1958:
2,845,510‘
Biersack _.___‘__________ __ July 29,1958
72,897,323
Krase et al. __‘___'__'__'____ July;.28’, 1959*
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