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Патент USA US3098924

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July 23,_ 1963‘
3,098,915
L. V. CHABALA
CIRCUIT INTERRUPTER
Filed Nov. 16, 1961
9 Sheets-Sheet 1
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INVENTOR.
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BY
July 23, 1963
L_. v. CHABALA
3,098,915
cmcuzw INTERRUPTER
Filed NOV. l6, 1961
9 Sheets-Sheet 3
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July 23, 1963
|_. v. CHABALA
3,098,915
CIRCUIT INTERRUPTER
Filed Nov. 16, 1961
9 Sheets-Sheet 4
July 23, 1963
|_. v. CHABALA
3,098,915
CIRCUIT INTERRUPTER
Filed Nov. 16, 1961
9 Sheets-Sheet 5
r
A
J2
gI-l l
July 23, 1963
|_. v. CHABALA
3,098,915
CIRCUIT INTERRUPTER
Filed Nov. 16. 1961
9 Sheets-Sheet 6
July 23, 1963
L. V. CHABALA
3,098,915
CIRCUIT INTERRUPTER
Filed Nov. 16. 1961
9 Sheets-Sheet 7
July 23, 1963
|_. v. CHABALA
3,098,915
CIRCUIT INTERRUPTER
Filed NOV. 16, 1961
:
9 Sheets-Sheet 9
United States Patent 0 "
3,098,915
Delaware
Filed Nov. 16, 1961, Ser. No. 152,843
15 Claims. (Cl. 200-146}
Patented July 23, 1953
2
1
ClRCUlT INTERRUPTER
Leonard V. Chabala, Maywood, 111., assignor to S 8: C
Electric (iompany, Chicago, 111., a corporation of
3,098,915
along the line 12-12 of FIG. 11 and showing the open
ings in the piston that are closed 'by the check valve.
Referring now particularly to FIG. 1 of the drawings,
it will be observed that the reference character 10 des
ignates, generally, switch means in which the present in
vention is embodied.
The switch means 10 includes a
base, indicated generally at 11, that may be formed by a
pair of rolled steel channels suitably secured together.
Mounted on the base 11 are a ?rst insulator 12, a second
This invention relates, generally, to circuit interrupters
and it has particular relation to such devices for inter 10 insulator 13, which is rotatable, and a third insulator
rupting the flow ‘of alternating current in high voltage elec
tric power circuits.
It constitutes an improvement over
the circuit interrupter construction shown in application
Serial No. 704,397 ?led December 23, 1957, now Patent
No. 3,030,481, April 17, 1962, and in application Serial
No. 111,998 ?led May 23,1961.
Among the objects of this invention are: To provide
14. The second insulator 13 is rotatably mounted on a
bearing 15 that is carried by the base 11 and it has an
arm 16 extending therefrom for connection to a suit
able operating linkage that is indicated, generally, at 17.
It will be understood that, for three phase operation,
three of the switch means 10 are mounted on a suit
able switching structure in proper spaced relation, depend
ing upon the voltage of the circuit, ‘and that suitable
operating means, common to the operating linkage 17,
is substantially uniformly distributed; to provide main and 20 is provided for effecting the simultaneous rotation of the
second insulator 13 of each switch means 10 for effecting
arcing contacts for operation along a single axis; to re
simultaneous operation of the three switch means 10 for
quire only a single operating seal for a circuit interrupter
either opening or closing the circuit as may be required.
of the gas ?lled type by providing a single operating mem
Such an operating mechanism is illustrated and described
ber for moving the main and arcing contacts; to provide
an improved circuit interrupter construction having co 25 in copending application Serial No. 704,397, above re
ferred to.
axial main and arcing contacts that are opened and closed
Extending upwardly from and rotatable with the second
by a single operating rod with provision ‘with the cou
insulator 13 is a shaft 18. The shaft 18 extends through
?nes of the interrupter for sequentially moving the con
and is rotatably mounted on a mechanism housing 19
tacts to elfect the ?nal circuit opening by separation
of the arcing contacts; to provide in a new and improved 30 the details of construction of which are set ‘forth in ap—
an improved circuit interrupter so arranged and con
structed that the electrostatic stress between its terminals
manner for directing a ?ow of arc extinguishing gas un
der pressure to the space in which the arc is drawn be
tween the arcing contacts; to direct the ?ow of arc
extinguishing gas to the arc space through a nozzle
mounted on a disc that is slidable in a cylinder which
forms the main movable contact of the circuit inter
rupter; to cause the arc extinguishing gas to flow by hold
ing stationary a piston in the cylindrical main movable
contact while it is moved toward open position; and to
prevent the creation of a vacuum between the disc and
piston when the main cylindrical contact is moved to
ward closed position by providing a check valve on the
piston which opens to place its opposite sides in com
munication with each other.
Other objects of this invention will, in part, be obvious
and in part appear hereinafter.
'In the drawings:
FIG. 1 is a view, in side elevation, of switch means em
bodying the present invention.
FIGS. 2A-2B-2C-2D placed in end to end relation
in the order named show a vertical longitudinal sectional
view through the load current interrupter embodying the
present invention.
FIGS. 3 and 4 are vertical sectional views taken, gen
erally, along the lines 3—3 and 4-—4, respectively, of
FIG. 2A.
FIGS. 5, 6 and 7 are vertical sectional views taken,
generally, ‘along the lines 5—-5, 6-6 ‘and 7—7 of
plication Serial No. 704,397, above referred to, together
with the operating mechanism therein which is controlled
by the shaft 18. For present purposes it is pointed out
that the shaft 18 extends through the mechanism housing
19 and carries at its upper end a switch crank 20 which
is rotatable therewith. The switch crank 20 is pivotally
connected to a link 21 that is pivoted at 22 to an arm 23
which extends from a switch blade 24 that forms a part of
a disconnecting switch that is indicated, generally, at 125.
The switch blade 24 is pivoted at 26 on a bracket 27 which
is carried by one wall of the mechanism housing 19. At
its swinging end the switch blade 24 is arranged to move
into and out of high pressure contact engagement with a
line contact member, shown generally at 28, which is
carried by the ?rst insulator 12. -It will be understood
that, on rotation of the second insulator 13 by the op
erating linkage 17, a corresponding rotation of the switch
crank 20 is effected for swinging the switch blade 24 out
of or into high pressure contact engagement with the line
contact member 28, depending upon the direction of ro
tation. The details of construction of the disconnecting
switch 25 are conventional and may be as disclosed in
US. Patent No. 2,818,474, issued December 31, 1957.
‘It is desirable that the switch blade 24 be opened only
after the circuit has been opened previously by some
other means. The reason for this is to prevent the
drawing of an arc between the swinging end of the switch
blade 24 and the line contact member 28 when the circuit
is interrupted under load which might result in damage
FIG. 2B.
to these parts or the creation of a fault by arcing over to
60
FIG. 8 is a vertical sectional view taken, generally,
an adjacent phase or to ground. For this purpose there
along the line 8-8 of FIG. 2C.
is mounted between the mechanism housing 19 and a
FIG. 9 is a view, somewhat diagrammatic in character,
line terminal 31, which is carried by the third insulator
showing the relative positions of the main and arcing con
14, a load current interrupter that is indicated, generally
tacts in the closed positions thereof.
65 at 32. As will appear hereinafter, separable contact
‘FIG. 10 is a view, similar to FIG. 9, but showing the
means are provided in the load current interrupter 3.2
movable contact in a partly open position while the arc
which are operated by the mechanism within the mecha
ing contacts remain closed.
nism housing 19 under the control of the shaft 18 as
FIG. 11 is a view, similar to FIGS. 9 and 10‘, showing
described in detail in application Serial No. 704,397.
the main and arcing contacts in the fully opened positions 70 Since the present invention is directed principally to the
thereof.
construction of the load current interrupter 32, the fol
‘FIG. 12 is a vertical sectional view taken generally
lowing description will pertain to its preferred arrange
3,098,915
3%
ments, it being understood that the operating mechanism
referred to is employed for controlling the opening and
closing of the contacts of the load current interrupter 32.
The load current interrupter 32 is provided with an in
sulating housing 33 that preferably is a one piece hollow
porcelain housing which may have a cylindrical ex
terior, as shown, or may have external corrugations to in
crease its flashover value between the ends. At the ends
noted that the coupling stud 64 is telescoped within the
adjacent end of the operating member 52, as indicated at
65, and is suitably secured thereto as by brazing. The
bellows sections 62 permit the endwise movement of the
operating member 52 through the terminal plate 48 while
maintaining the gas tight integrity of the insulating hous
ing 33 and the circuit terminals 34 and 35 secured thereto.
Extending inwardly from the ?rst circuit terminal 34
of the insulating housing 33 there are provided ?rst and
is a stationary contact that is indicated, generally, at 68
second circuit terminals that are indicated, generally, at 34 10 and shown more clearly in FIGS. 2A and 21B of the draw
and 35.
ings. Extending inwardly, FIGS. 23 and 2C, into the in
Referring now particularly to FIG. 2A, it will be ob
sulating housing 33 from the second circuit terminal 35
served that the ?rst circuit terminal 34 includes a terminal
bracket 36 that is secured by bolts 37, FIG. 1, to the line
terminal 31 that is carried by the third insulator 14.
Bolts 33 extend through a terminal plate 39 from an up
standing part of the terminal bracket 36 and are threaded
into an inner terminal 4% which, as shown in FIG. 3,
is provided with four ?at sides Kill for a purpose that will
be described hereinafter. 0 rings 42 provide a seal be
tween the juxtaposed surfaces of the terminal plate 39
and inner terminal 40 and extend around the respective
bolts 38 as shown. Formed integrally with the terminal
plate 39 is an annular ?ange 43 which is telescoped over
the adjacent end of the insulating housing 33 and is se
cured thereto by a suitable ?lling of cement 44. An an
nular gasket 45 provides an additional seal between the
terminal plate 39 and the juxtaposed end surface of the
insulating housing 33.
Referring now particularly to FIG. 2C of the drawings
and to the opposite end of the load current interrupter
32, it will be observed that an adapter, shown generally
at 47, constitutes a part of the second circuit terminal
35 and is mounted by suitable bolts (not shown) on the
mechanism housing 19. Secured to the adapter 47 by
bolts (not shown) is a terminal plate 48 which has an
integral annular ?ange 39 that overlies the adjacent end
of the insulating housing 33 and is secured thereto by a
?lling of cement 50. An annular gasket 51 is interposed
between the juxtaposed surfaces of the terminal plate 40
48 and of the end of the insulating housing 33 to provide
an additional seal therebetween to the end that the in
terior of the insulating housing 33 is gas tight.
The operating means for the load current interrupter
is a movable contact that is indicated, generally, at 69.
Associated with the stationary contact 68 is a ?rst arcing
contact that is indicated, generally, at 70 while a second
arcing contact, shown generally at 71, FIG. 2B, is asso
ciated with the movable contact 69. These contacts now
will be described.
Referring ?rst to FIGS. 2A—-2B--3—4, it will be
observed that the stationary contact 68 includes a plu—
rality of bars, for example four, of good conducting ma
terial such as copper and indicated at '72. These bars 72
which not [only function to conduct current but also as
guides, are secured by screws 73 to the inner terminal 4%)
and by screws 74 to flat sides 75 of a portion of a sup
port ring ‘76. The support ring '76 has an annular out
wardly facing groove 77 for receiving bosses 73 of con
tact ?ngers 79 which are also shown in FIG. 5. ‘Contact
springs 88, individual to the contact ?ngers '79, serve to
bias the latter inwardly and a retaining ring 81 surround
ing the contact springs 89 serves to hold the latter in posi
tion. It will be observed that the stationary contact
?ngers 79 are mounted symmetrically about the longi
tudinal axis of the insulating housing 33 and at the distal
ends of the bars '72 on the supporting ring 76. This
symmetrical structure along with the cooperating sym
metrical structures associated therewith functions to dis
tribute uniformly the electrostatic stress between the
?rst and second terminals 264 and 35 in either the open
or closed position of the load current interrupter 32.
The ?rst arcing contact 73', shown in FIGS. 2A—2~B,
includes a contact tip 84 of arc resisting material which
is carried by a metallic contact sleeve 85 which, in turn,
is secured to one end of a metallic drive tube 86.
The
32 includes an operating member 52 in the form of a 45 drive tube 86 has an annular boss 37 intermediate its
ends for a purpose that will be set forth presently. At
metallic tube which, as shown in FIG. 2D, extends into
the opposite end of the metallic drive tube S6 is a piston
and is fastened to a cross head 53 which is connected by
88 having formed integrally therewith a sleeve 89 that
links 54 to a main rod arm 55 of the spring driven op
erating mechanism within the mechanism housing 19 all
as described in application Serial No. 704,397. Since
only a single operating member 52 is employed for
operating the load current interrupter 32, it is unnecessary
to employ the additional auxiliary rod arm and operating
mechanism therefor as disclosed in application Serial No.
704,397. The operating member 52 is guided on a guide
is telescoped within the drive tube 315.
The piston 88
has close ?tting engagement with an inner sleeve 9d of a
stop tube 91 which extends from and is secured to a key
mounting block 92 that bears against the terminal plate
39. The key mounting block 92 has an annular groove
94 with openings 95 at the bottom through the stop tube
rod 56 which extends from one wall of the mechanism
91 and the inner sleeve 98' into a gas space 96 into
which the piston 38 moves. Surrounding the outer end
housing 19.
of the openings 95 and along the bottom of the annular
Layers of a suitable shock absorbing ma
terial 57 are mounted on this wall for cushioning the
shock incident to the stopping of the main rod arm 55
and parts associated therewith in the open position of the
load current interrupter 32.
In FIG. 20 it will be observed that the operating mem
ber 52 extends through an opening 58 in an annular
groove 94 is a pressure relief ring 97 which is formed of
flat spring material having the ends overlapping. Sur
rounding the pressure relief ring 97 is a garter spring
93 with the arrangement being such, as described in U.S.
Patent No. 2,108,993, issued February 2, ‘1938, that on
the generation of predetermined pressure in the gas space
96 as a result of the movement of the piston 88 into it,
coupling tube 61 that inter?ts and is sealed to the terminal 65 the pressure relief ring 97 is expanded against the force
of the garter spring 93 to exhaust the gas in space 96
plate 48 which forms a part of the second circuit terminal
through the openings 95. This construction is provided
35. As described in application Serial No. 111,998, above
in order to prevent or limit the bouncing of the ?rst
referred to, a sealed connection between the operating
arcing contact '79 when it is retracted as ‘described here
member 52 and the terminal plate 43 can be provided
by employing a plurality of bellows sections 62. At the 70 inafter during the circuit opening operation.
right end one bellows section 62 is brazed or otherwise
‘During the circuit opening operation contact engage
secured to the juxtaposed surface of the annular ?ange
ment is maintained between the ?rst arcing contact 79
59 while the bellows section 62 at the opposite end is
and the second arcing contact 71 as a result of conjoint
brazed or otherwise secured to an end guide washer 63
movement thereof during a portion of the opening op
that is suitably brazed to a coupling stud 64. It will be
eration of the load current interrupter 32. It is desirable
?ange 59 which is soldered at its to the outer end of a
8,098,915
to move the ?rst arcing contact 70 away from the second
arcing contact 71 with a snap action to initiate the ?nal
opening of the circuit. For this purpose a spindle 99
is telescoped within the metallic contact sleeve 85 and
the metallic drive tube 86. It has a head 1%‘ at the
associated for movement therewith pull rods 135 of in—
sulating material are secured to the outstanding portions
of the carriage 1‘21 and also to outriggers 136 that are
inner end adjacent the contact tip 84 when it is in the
circuit closed position and a foot 161 at the other end
69. It will be noted that the cylindrical movable contact
secured to and extend radially from .a cylindrical mova~
ble contact 137 which forms a part of the movable contact
137 has a contact ring 138 attached thereto at one end for
which constitutes a closure for the left end of the gas
contact engagement with the contact ?ngers 79 which
space 96 and is secured to the terminal plate 39. A coil
form a part of the stationary contact 68. At its other
compression spring 1% is interposed between the head 10 end the cylindrical movable contact 137 has a head
1% and foot 161 of the spindle 99 for the purpose of
13? brazed or otherwise secured thereto and it is pro
retracting the ?rst arcing contact 74) when it is released
vided with a central sleeve portion 14.10 that is telescoped
for such movement. If desired, several layers of shock
over the coupling stud 64. An insulating sleeve 14]. is
absorbing material 104 can be provided on the inner
interposed between the sleeve portion 140' and the cou
side of the foot 101 to receive the impact of the piston
pling stud 64 in order to prevent ?ow of current to the
88 at the end of the opening stroke of the ?rst arcing
coupling stud 64 and to the operating member 52 and
the bellows 62 associated therewith. A threaded stud
1452 extends endwise from the coupling stud 64» and over
tallic contact sleeve 85 from the support ring 76. As
it is positioned an insulating washer 143 against which a
here shown, roller contacts 165 in the form of elongated 20 nut 144 on the threaded stud 142 bears to complete
bars are mounted on the inside of the support ring 76
the insulation between the head 39 and the coupling stud
by screws 1136. Additional screws 1137 also provide for
64- while providing for the transmission of operating force
mounting the roller contacts 14115 on the support ring 76
therebetween.
and their inner ends project inwardly to provide stops
As shown in FEGS. 2B—2C connection to the cylin
for limiting the movement of the conical contact rollers 25 rical movable contact 137 from the second circuit ter
168 four of which preferably are provided. It will be
minal 35, or more particularly from the terminal plate 48,
observed that the conical contact surfaces of the contact
is provided by contact ?ngers 147 which are urged into
rollers 168 bear against the cylindrical surface 169 of the
engagement with the outer surface of the cylindrical
metallic contact sleeve 85 and also against the cylin
movable contact 137 by contact springs 148 that are held
drical surfaces 116 of the roller contacts 105. The 30 in place by a retaining ring 149. It will be understood
contact rollers 108 are rotatably mounted on transversely
that the cylindrical movable contract 137 moves from the
contact 7d.
FIGS. 213-5 show how connection is made to the me
extending bolts 111 and coil compression springs 112
circuit closed position shown in FIG. 2B of the drawings
serve to maintain good contact engagement between the
contact rollers 1% and the respective cylindrical sur
to an open position within the contact ?ngers 147 while
they maintain contact engagement with the outer sur—
face of the cylindrical movable contact 137. At the
opposite ends the contact ?ngers 147 are provided with
faces 169 and 116. Stop pins 113, extending radially
inwardly from the roller contacts 165, serve to limit
the endwise movement of the contact rollers 168 in the
same fashion that the projecting ends of the screws 197
accomplish this function at the opposite ends of the roller
contacts 105.
At a predetermined time in the opening sequence of
operations of the load current interrupter 32, provision
is made for triggering the ?rst arcing contact 76‘ to per
mit it to be retracted under the in?uence of the coil com
pression spring 103. For this purpose, FIG. 2A, a collar
116 is slidably mounted on the metallic drive tube 86
at a position to the left of the annular boss 87. The
collar 116 has a radially extending annular ‘?ange 117
which bears against the outer end of'the stop tube 91
and thus limits the movement of the collar 116. ‘Engage
able with the annular ?ange 117 are shoulders 118 that
are carried by pawls 119 which are pivoted at 126 on a
bosses 156 that inter?t with an annular groove 151 in a
contact support ring 152 that is secured, as by brazing,
to the distal end of a conducting tube 153 the opposite
end of which is secured, as by brazing, to the terminal
plate 48.
In order to insure retention of the contact
?ngers 147 on the contact support ring 152, headed pins
154 extend into the contact support ring 152 through
clearance openings 155 in the adjacent ends of the con
tact ?ngers 147. The retaining ring 149 is held in posi—
tion by brackets 156 which are secured by screws 157
to the outer surface of the contact support ring 152.
Referring now particularly to FIG. 2B of the drawings
it will be ‘observed that the second arcing contact ‘71
includes an annular contact tip 160 that engages the
contact tip 84 of the ?rst arcing contact 76' in the circuit
closed position. The annular contact tip 160‘ is carried
carriage 121. The carriage 121 is slidable relative to the
at one end of an arcing contact tube 161 which is tele
guide bars 72 and is directed therealong by transverse
scoped over and secured, as by brazing, to a stud 162
guides 122, FIG. 4, which are secured to the carriage
which has a base 163 that is secured by screws 164 to
1122-1 by screws 123. Here it will be observed that the
the head 139. Openings 165 are provided in the arcing
transverse guides 122 have inclined guide surfaces 124
contact tube 161. The construction is such that the
at their ends which overlie juxtaposed surfaces of the
second arcing contact ‘71 is a?ixed to the movable con
guide bars 72. The pawls 119 are normally maintained
tact 69and moves conjointly therewith.
in the position shown in FIG. 2A with the shoulders
In order to direct a flow of arc extinguishing gas
118 abutting the annular ?ange 117 through the agency of
into the are space that is formed on separation of the
transverse pins 125 that are interconnected by coil ten
contact tip 84 from the contact tip 160, a nozzle 166
sion springs 126. The pawls 119 are tripped to release
of insulating material, such as Te?on, is employed. The
the annular ?ange 117 by shoulders 127 that are pro
nozzle 166 has a throat portion 167 that is arranged, as
vided on keys 12% which are pivoted at 129 on the key
will appear hereinafter, to surround the contact tips 84
mounting block 92. The distal ends 13% of the keys 128‘
and ‘166 during the circuit opening operation. The nozzle
are guided in radial slots 131 in the juxtaposed ends of
166 is mounted on and moves with a disc 168 that is
the roller contacts 165.
slidable in the cylindrical movable contact 137. The
In order to accommodate erosion of the contact tip
disc 168 is carried by mounting studs 169' on a flange 170
34 and a juxtaposed contact tip on the second arcing 70 which has an integral central sleeve 171 which is slidable
contact 71 a coil compression spring 132 is interposed
on the arcing contact tube 161. Relative movement be
between the annular boss 87 and the annular ?ange 117.
tween the sleeve 171 and the arcing contact tube 161 is
This arrangement provides some degree of lost motion
limited by engagement of the left end of the sleeve 171
between the first arcing contact 76' land the pawls 119'.
with the right end of the annular contact tip 160. The
With a view to moving the carriage 121 and parts
nozzle 166 is held ‘in position shown in FIG. 2B by an
3,098,915
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8
annular stop plate 172 that is secured by screws 173 to
the roller contacts 105. A coil compression spring 174
serves to urge the disc 168 against the annular stop plate
leased from engagement with the stop plate 172 and the
coil compression spring 1741 moves it to the position here
shown where the throat portion 167 is well past the con
tact tip 84. At this time the piston 175 remains sta
tionary with respect to the movable contact 137 since
the push rods 1% are here shown in the position where
they engage the head ?ttings 177.
172 and to cause the nozzle 166 to move to the position
above referred to where it completely encloses the con
tact tips 84- and 160.
It will be recalled that the insulating housing 33 is
?lled with an arc extinguishing gas such as sulfurhexa
?uoride. This gas is present within the cylindrical mova
The continued movement of the movable contact 137
toward the open position continues to the full open posi
ble contact 137. In order to cause the gas to ?ow through 10 tion shown in FiG. 11.
the nozzle 166 a piston 175 is slidably mounted within
the cylindrical movable contact 137 adjacent the head
139 and the coil compression spring 174 reacts between
it ‘and the disc 168.
Provision is made for moving the piston 175 relative
to the cylindrical movable contact 137 as the latter is
moved toward the open circuit position. For this pur
During the time that the mov
able contact 137 shifts from the position shown in FIG.
10 to the position shown in FIG. 11, the transverse pins
125 have been tripped by engaging the trip shoulders 127
on the keys 128. The coil compression spring 163 is re
leased and it moves the ?rst arcing contact 71} to the posi
tion shown in FIG. 11 of the drawings. While this is
taking place the arc is drawn between the contact tips 84
and 161i and are extinguishing gas is being forced through
pose recesses 176 are provided on the underside of the
the nozzle 166 since the piston 175 is moved to the posi
piston 175 for receiving head ?ttings 177 that are car
ried at the ends of push tubes 17% which extend thorugh 20 tion shown in FIG. 11 and the arc is extinguished.
Continued rotation of the insulator 13 in the opening
openings 179 in the head 139. The other ends of the
direction swings the switch blade 24 out of contact en
push tubes 178 are telescoped over push rods 18% which
gagement with the line contact member 28 after the cir
are carried by a ring 181 that is secured by screws 182
cuit has been interrupted by the load current interrupter
to the contact support ring 152. During the initial por
tion of the opening stroke of the movable contact 69, 25 32 in the manner described. Continued rotation of the
insulator 13, as described in application Serial No.
the push tubes 17% move relative to the push rods 1%
704,397, swings the switch blade 24 to a position at right
so that the piston 175 remains stationary with respect
angles to its closed position, recocks the spring mechanism
to the cylindrical movable contact 137. When the mova
in the mechanism housing and operates the main rod arm
ble contact 1317 has been withdrawn to such position
that the distal ends of the push rods 18% engage the 30 55, FIG. 2D, back to the position shown here. The posi
tions of the stationary and movable contacts 68 and 69
head ?ttings 177, the conjoint movement of the latter with
and of the ?rst and second arcing contacts 71) and 71
the movable contact 137 ceases. Now on continued
then are restored to those shown in FIGS. 2A—2B—
movement of the movable contact 137, the piston 175
remains stationary and compresses the arc extinguishing
2C—2D—9.
1
gas in the space 183 between it and the disc 168. As a 35
What is claimed as new is:
result the gas ?ows through the nozzle 166 into the
1. In a circuit interrupter, in combination, ?rst and
space in which the arc is drawn between the contact tips
84 and 160 for assisting in extinguishing the arc.
second circuit terminals in insulated spaced relation, a
During the initial portion of the closing movement of
stationary contact connected to said ?rst terminal and ex
tending toward said second terminal, a movable contact
the movable contact 137, a vacuum may be created in 40 connected to said second terminal and engaging said sta
tionary contact in closed position, operating means con
the space 183. This can be obviated, as shown in FIG.
'11, by providing openings 185 in the piston 175 and then
overlying these openings with a check valve disc 186 that
is slidably mounted on a spool shaped bushing 187 which
nected to said movable contact for moving it along an
axis endwise of said stationary contact between open and
closed position, a ?rst arcing contact mounted on said
extends through the opening in the piston 175 through
stationary contact for movement along said axis, biasing
means for said ?rst arcing contact urging it toward said
which the arcing contact tube 161 extends.
In describing the circuit opening operation of the switch
?rst terminal, a second arcing contact mounted on and
movable with said movable contact and engaging said
means 10, it will be assumed that it is in the closed posi
?rst arcing contact in closed position, carriage means
tion as shown in FIG. 1. In order to e?ect the opening
operation the second insulator 13 is rotated by the operat 50 connected to said operating means and movable with said
ing linkage 17 to rotate the shaft 18 which elfects rota
movable contact, disengageable connecting means be
tween said carriage means and said ?rst arcing contact for
tion of the switch blade 24 about its longitudinal axis to
maintaining contact engagement between said ?rst and
relieve the high pressure contact engagement between it
second arcing contacts during the initial movement toward
and the line contact member 28. While this is taking
open position of said operating means and said movable
place a latch is released in the mechanism housing 19 as
contact, and trip means cooperating with said connect
described in application Serial No. 704,397 to effect the
ing means after said movable contact has disengaged said
movement of the main rod arm 55, FIG. 21), to move the
stationary contact to disengage said connecting means
operating member 52 quickly from the closed position
from said ?rst arcing contact whereupon said ?rst arcing
to the open position.
1
‘FIG. 9 of the drawings shows the closed positions of 60 contact is moved by said biasing means away from said
second arcing contact to interrupt the circuit between said
the stationary and movable contacts 68 and 69 and of
?rst and second terminals.
the ?rst and second arcing contacts 76 and 71. As pointed
2. In a circuit interrupter, in combination, ?rst and
out hereinbefore, in the closed position the contact ring
second circuit terminals in insulated spaced relation, a
133 on the cylindrical movable contact 137 is in contact
stationary contact connected to said ?rst terminal and ex
engagement with the contact ?ngers 79‘ so as to provide
tending toward said second terminal, a movable contact
the main current carrying path between the ?rst and sec
connected to said second terminal and engaging said sta
ond circuit terminals 34 and 35. In addition, a shunt
tionary contact in closed position, operating means con
circuit is provided through the arcing tips 84 and 160
nected to said movable contact for moving it along an
of the ?rst and second arcing contacts 7% and 71.
FIG. 10 shows an intermediate stage in the opening of 70 axis endwise of said stationary contact between open and
closed positions, a ?rst arcing contact mounted on said
the load current interrupter 32. Here the movable con
stationary contact for movement along said axis, a ?rst
tact 137 has been shifted to a position in spaced relation
biasing ‘means for said ?rst arcing contact urging it to
to the contact ?ngers 79 while the ?rst and second arcing
ward said ?rst terminal, a second arcing contact mounted
contacts 76 and 71 remain in contact engagement at their
contact tips 54 and 160. The nozzle 166 has been re Cl on and movable with said movable contact and engaging
3,098,915
b
id
said ?rst 'ancing contact in closed position, a second bias
cooperating with said connecting means after said mov
ing means for said ?rst arcing terminal capable of exert
able contact has disengaged said stationary contact to dis—
ing thereon a greater force than said ?rst biasing means
engage said connecting means from said ?rst arcing con
and urging said ?rst arcing terminal into contact engage
tact whereupon said ?rst arcing contact is moved by said
ment with said second arcing contact in closed position,
biasing means away from said second arcing contact to
carriage means connected to said operating means and
interrupt the circuit between said ?rst ‘and second ter
movable with said movable contact, disengageable con
minals.
necting means between said carriage means and said ?rst
5. The invention, as set forth in claim 4, wherein the
arcing contact for maintaining contact engagement be
sleeve member has pressure relief means ‘for the space
tween said ?rst and second arcing contacts during the 10 in which gas is compressed by the piston to vent the
initial movement toward open position of said operating
space on generation therein of predetermined pressure‘.
means and said movable contact, and trip means cooper
6. In a circuit interrupter, in combination, ?rst and
ating with said connecting means after said movable
second circuit terminals in insulated spaced relation, a
contact has disengaged said stationary contact to disen
stationary contact connected to said ?rst terminal and ex—
gage said connecting means from said ?rst arcing con
tending toward said second terminal, a movable contact
tact whereupon said ?rst arcing contact is moved by said
connected to said second terminal and engaging said
biasing means away from said second arcing contact to in
stationary contact in closed position, operating means
terrupt the circuit between said ?rst and second terminals.
connected to said movable contact for moving it along
3. In a circuit interrupter, in combination, ?rst and sec
an axis endwise of said stationary contact between open
and closed positions, a ?rst arcing contact having a
ond circuit terminals in insulated spaced relation, a sta
tionary contact connected to said ?rst terminal and ex
cylindrical section and mounted on said stationary con
tending toward said second terminal, a movable contact
tact for movement along said axis, roller contact means
interposed between said cylindrical section of said ?rst
connected to said second terminal and engaging said sta
tionary contact in closed position, operating means con
arcing contact and said stationary contact, biasing means
for said ?rst arcing contact urging it toward said ?rst
nected to said movable contact for moving it along an axis
terminal, a second arcing contact mount-ed on and mov
endwise of said stationary contact between open and
able with said movable contact and engaging said ?rst
closed positions, a ?rst arcing contact mounted on said
arcing contact in closed position, carriage means con
stationary contact for movement along said axis and hav
nected to said operating means and movable with said
ing a tubular section, a spindle secured at one end to said
movable contact, disengageable connecting means be
?rst terminal and telescoped within said tubular section of
tween said carriage means and said ?rst arcing contact
said ?rst arcing contact, a coil compression spring inter
for maintaining contact engagement between said ?rst
posed between the distal end of said spindle and said
and second arcing contacts during the initial movement
tubular section and urging said ?rs-t arcing contact toward
toward open position of said operating means and said
said ?rst terminal, a second arcing contact mounted on
movable contact, and trip means cooperating with said
‘and movable with said movable contact and engaging said
connecting means after said movable contact has dis—
?rst arcing contact in closed position, carriage means con
engaged said stationary contact to disengage said con
nected to said operating means and movable with said
necting means from said ?rst arcing contact whereupon
movable contact, disengageable connecting means between
said ?rst arcing contact is moved by said biasing means
said carriage means and said ?rst arcing contact for main
away from said second arcing contact to interrupt the
taining contact engagement between said ?rst and second
circuit between said ?rst and second terminals.
arcing contacts during the initial movement toward open
7. In a circuit interrupter, in combination, ?rst and
position of said operating means and said movable con
second circuit terminals in insulated spaced relation, a
tact, and trip means cooperating with said connecting
stationary contact connected to said ?rst terminal and
means after said movable contact has disengaged said
extending toward said second terminal, a movable con
stationary contact to disengage said connecting means
tact connected to said second terminal and engaging said
from said ?rst arcing contact whereupon said ?rst arcing
stationary contact in closed position, operating means
contact is moved by said coil compression spring away
connected to said movable contact for moving it along
from said second arcing contact to interrupt the circuit
an axis endwise of said stationary contact between open
between said ?rst and seond terminals.
and closed positions, a ?rst arcing contact having a cylin
4. In a circuit interrupter, in combination, ?rst and
drical section and mounted on said stationary contact
second circuit terminals in insulated spaced relation, a
for movement along said axis, a pair of contact bars
stationary contact connected to said ?rst terminal and ex
on'said stationary contact on opposite sides of and having
tending toward said second terminal, a movable contact
cylindrical surfaces facing said cylindrical section of said
connected to said second terminal and engaging said sta
?rst arcing contact, a pair of conical contact rollers in
tionary contact in closed position, operating means con
terposed between each contact bar and the juxtaposed
nected to said movable contact for moving it along an
side of said cylindrical section of said ?rst arcing contact,
axis endwise of said stationary contact between open and
stop means on said stationary contact limiting movement
closed positions, a ?rst arcing contact mounted on said
of said contact rollers with respect to said ?rst arcing
stationary contact ‘for movement along said axis, biasing
contact, biasing means for said ?rst arcing contact urging
means for said ?rst arcing contact urging it toward said
?rst terminal, said ?rst arcing contact having a tubular 60 it toward said ?rst terminal, a second arcing contact
mounted on and movable with said movable contact and
section ‘with a piston at the end opposite its arcing end,
engaging said ?rst arcing contact in ‘closed position, car
a sleeve member on said ?irst terminal slidably receiving,
riage
means connected to said operating means and
said piston and providing a space in which gas is com
movable with said movable contact, disengageable con
pressed on retraction of said ?rst ‘arcing contact by said
necting means between said carriage means and said
biasing means to cushion the stopping thereof, a second
?rst
arcing contact for maintaining contact engagement
arcing contact mounted on and movable with said mov
between said ?rst and second arcing contacts during the
able contact ‘and engaginry said ?rst arcing contact in
initial movement toward open position of said operating
closed position, carriage means connected to said oper
means and said movable contact, and trip means co~
ating means and movable with said movable contact, dis 70 operating with said connecting means after said movable
engageable connecting means between said carriage means
contact has disengaged said stationary contact to dis
and said ?rst arcing contact for maintaining contact en
engage said connecting means from said ?rst arcing con
gagement between said ?rst and second ‘arcing contacts
tact whereupon said ?rst arcing contact is moved by said
during the initial movement toward open position of said
biasing means away from said arcing contact to inter
operating ‘means and said movable contact, and trip means 75 rupt the circuit between said ?rst and second terminals.
ill
8. In a circuit interrupter, in combination, ?rst and
ing between said ?rst terminal and said ?rst arcing con
tact and urging the latter toward the former, a second
arcing contact mounted centrally on and movable with
said movable contact and engaging said ?rst arcing con
extending toward said second terminal, a movable con
tact connected to said second terminal and engaging said U! tact in closed position, a carriage guided on said guide
bars for movement along said axis ‘between said ?rst ter
stationary contact in closed position, operating means
minal and said contact ?ngers, insulated pull rod means
connected to said movable contact for moving it along
mechanically interconnecting said movable contact and
an axis endwise of said stationary contact between open
said carriage, pawl means on said carriage operatively
and closed positions, a ?rst arcing contact mounted on
said stationary contact for movement along said axis, 10 connected to said ?rst arcing contact and maintaining it
in contact engagement with said second arcing contact
biasing means for said ?rst arcing contact urging it to
against the action of said biasing means during the initial
ward said ?rst terminal, a second arcing contact mounted
movement toward open position of said operating means
on and movable with said movable contact and engaging
and said movable contact, and key means extending from
said ?rst arcing contact in closed position, carriage means
said ?rst terminal along said axis toward said second
guided for movement along said axis between said ?rst
terminal and cooperating with said pawl means after
terminal and said stationary contact, pull rod means
said movable contact has disengaged said contact ?ngers
mechanically interconnecting said movable contact and
to move said pawl means out of its connection to said
said carriage means, disengageable connecting means be
?rst arcing contact whereupon said ?rst arcing contact
tween said carriage means and said ?rst arcing contact
is moved by said biasing means away ‘from said second
for maintaining contact engagement between said ?rst
arcing contact to interrupt the circuit between said ?rst
and second arcing contacts during the initial movement
and second terminals.
toward open position of said operating means and said
11. In a circut interrupter, in combination, ?rst and
movable contact, and trip means cooperating with said
second circuit terminals in insulated spaced relation, a
connecting means after said movable contact has dis
plurality of conducting guide bars extending symmetri
engaged said stationary contact to disengage said con
cally about an axis from said ?rst terminal toward said
necting means from said ?rst arcing contact whereupon
second terminal, a plurality of ?rst contact ?ngers sym
said ?rst arcing contact is moved by said biasing means
metrically mounted about said axis on the distal ends
away from said second arcing contact to interrupt the
of said guide bars, immovable endwise and biased ra
circuit between said ?rst and second terminals.
9. In a circuit interrupter, in combination, ?rst and 30 dially inwardly, a tubular movable contact having tele
scoping engagement at one end with said ?rst contact
second circuit terminals in insulated spaced relation, a
plurality of conducting guide bars extending symmetri
?ngers, a conducting member extending from said second
cally about an axis from said ?rst terminal toward said
terminal toward said ?rst terminal; a plurality of second
contact ?ngers symmetrically mounted about said axis
second terminal, a plurality of contact ?ngers symmetri
cally mounted about said axis at the distal ends of said
on the distal end of said conducting member, immovable
endwise, and biased radially inwardly into contact en
guide bars, a tubular movable contact connected to said
econd terminal and having telescoping engagement with
gagement with the other end of said tubular movable
contact when it is in closed position; operating means
said contact ?ngers, operating means connected to said
connected to said movable contact for moving it along
movable contact for moving it along said axis endwise
said axis endwise of said ?rst and second contact ?ngers
of said contact ?ngers between open and closed positions,
between open and closed positions while maintaining
a ?rst arcing contact mounted on said guide bars for
contact with said second contact ?ngers, a ?rst arcing
movement along said axis, biasing means reacting be
contact mounted on said guide bars for movement along
tween said ?rst terminal and said ?rst arcing contact
said axis, biasing means reacting between said ?rst ter
and urging the latter toward the former, a second arcing
minal and said ?rst arcing contact and urging the latter
contact mounted centrally on and movable with said
movable contact and engaging said ?rst arcing contact
toward the former, a second arcing contact mounted
in closed position, a carriage guided on said guide bars
centrally on and movable Wtih said movable contact and
for movement along said axis between said ?rst terminal
engaging said ?rst arcing contact in closed position, a
carriage guided on said guide bars for movement along
and said contact ?ngers, insulated pull rod means me
chanically interconnecting said movable contact and said
said axis between said ?rst terminal and said contact
carriage, disengageable connecting means between said
?ngers, insulated pull rod means mechanically intercon
carriage and said ?rst arcing contact for maintaining con
nectlng said movable contact and said carriage, disen
gageable connecting means between said carriage and said
tact engagement between said ?rst and second arcing
contacts against the action of said biasing means during
?rst arcing contact for maintaining it in contact engage
ment with said second arcing contact against the action
the initial movement toward open position of said operat
of said biasing means during the initial movement to
ing means and said movable contact, and trip means co
operating with said connecting means after said movable
ward open position of said operating means and said
contact has disengaged said contact ?ngers to disengage
movable contact, and trip means cooperating with said
said connecting means from said ?rst arcing contact
connecting means after said movable contact has disen
whereupon said ?rst arcing contact is moved by said
gaged said ?rst contact ?ngers to disengage said connect
biasing means away from said second arcing contact to 60 mg means from said ?rst arcing contact whereupon said
interrupt the circuit between said ?rst and second ter
?rst arcing contact is moved by said biasing means away
from said second arcing contact to interrupt the circuit
minals.
between said ?rst and second terminals.
10. In a circuit interrupter, in combination, ?rst and
second circuit terminals in insulated spaced relation, a
‘ 12. The invention, as set forth in claim 11, wherein
plurality of conducting guide bars extending symmetri
insulating means is interposed between the operating
means and said movable contact whereby the entire cur
cally about an axis from said ?rst terminal toward said
rent ?ow takes place through the second contact ?ngers.
second terminal, a plurality of contact ?ngers sym
metrically mounted about said axis at the distal ends of
13. In a circuit interrupter, in combination, a ?uid
second circuit terminals in insulated spaced relation, a
stationary contact connected to said ?rst terminal and
tight insulating housing, ?rst and second circuit terminals
said second terminal and having telescoping engagement 70 at opposite ends of said housing, a ?lling of arc ex
said guide bars, a tubular movable contact connected to
with said contact ?ngers, operating means connected to
said movable contact for moving it along said axis end
wise of said contact ?ngers between open and closed
positions, a ?rst arcing contact mounted on said guide
bars for movement along said axis, biasing means react
tinguishing gas in said housing, a stationary contact con
nected to said ?rst terminal and extending toward said
second terminal, a movable contact connected to said
second terminal and engaging said stationary contacts
in closed position, operating means connected to said
3,098,915
13
14
movable contact for moving it along an axis endwise of
said stationary contact between open and closed positions,
tight insulating v‘housing, ?rst and second circuit terminals
a ?rst arcing contact mounted on said stationary con
tact vfor movement along said axis, biasing means for
said ?rst arcing contact urging it toward said ?rst ter
minal, a second arcing contact mounted on and mov
at opposite ends of said housing, a ?lling of are extin
guishing gas in said housing, a stationary contact con
nected to said ?rst terminal and extending toward said
second terminal, a tubular movable contact closed at
one end [and opening toward said ?rst terminal, said
able With said movable contact and engaging said ?rst
movable contact being connected to said second terminal
arcing contact in closed position, carriage means con
and engaging said stationary contact in closed position,
nected to said operating means and movable with said
operating means connected to said movable contact for
movable contact, disengageable connecting means be 10 moving it along an axis endwise of said stationary con
tween said carriage means and said ?rst arcing contact
tact between open and closed positions, a ?rst arcing con
for maintaining contact engagement between said ?rst
tact mounted :on said stationary contact for movement
and second arcing contacts during the initial movement
along said axis, biasing means for said ?rst larcing con
toward open position of said operating means and said
tact urging it toward said ?rst terminal, a second arcing
movable contact, trip means cooperating with said con 15 contact mounted on ‘and movable with said movable
necting means after said movable contact has disengaged
contact ‘and engaging said ?rst arcing contact in closed
said stationary contact to disengage said connecting means
position ‘and projecting out of the open end of said mov
from said ?rst arcing contact whereupon said ?rst arcing
able contact, ca-rriage means connected to said operating
contact is moved by said biasing means away from said
means and movable with said movable contact, disen
arcing contact to interrupt the circuit between said ?rst
gageable connecting means between said carriage means
and second terminals, a nozzle mounted on and movable
and said ?rst arcing contact for maintaining contact en
with said movable contact for directing a ?ow of said
gagement between said ?rst and second arcing contacts
are extinguishing gas to the space between said arcing con
during the initial movement toward open position of said
tacts, and means operated by said operating means to
operating means ‘and said movable contact, trip means
cause said are extinguishing gas to ?ow under pressure 25 cooperating
through said nozzle into said space.
:14. In a circuit interrupter, in combination, a ?uid
tight insulating housing, ?rst 5and second terminals at
said connecting means after said mov
able contact has disengaged said stationary contact to
disengage said connecting means from said ?rst arcing
contact whereupon said ?rst arcing contact is moved by
opposite ends of said housing, ‘a ?lling of arc extinguish
said biasing means away from said second arcing contact
ing gas in said housing, 1a stationary contact connected to 30 to interrupt the circuit between said ?rst and second ter
said ?rst terminal and extending toward said second
minals, a sleeve slidable on said arcing contact carrying
terminal, a tubular movable contact closed at one end
a radially extending ?ange, a disc extending substantially
and opening toward said ?rst terminal, said movable
entirely across the interior of said tubular contact and
contact being connected to said second terminal and
mounted on said ?ange in spaced relation thereto, a
engaging said stationary contact in closed position, op
nozzle telescoped over said second arcing contact and
erating means connected to said movable contact for
carried by and opening through said disc for directing
moving it along an axis endwi-se of said stationary con
tact between open and closed positions, a ?rst ‘arcing
contact mounted on said stationary contact for move
‘a flow of said ‘arc extinguishing gas to the space between
said arcing contacts, means biasing said disc and thereby
said nozzle outwardly of said tubular movable contact
ment along said axis, biasing means for said ?rst arcing 40 to surround a substantial part of said space and the are
contact urging it toward said ?rst terminal, a second
drawn therein on opening movement of said movable
arcing contact mounted on \and movable with said mov
contact, and means operated by said operating means to
able contact and engaging said ?rst arcing contact in
cause said are extinguishing gas to‘ ?ow under pressure
closed position and projecting out of the open end of said
through said nozzle into said space.
movable contact, carriage means connected to said op 45
16‘. The invention, ‘as set vforth in claim 15, wherein
erating means and movable with said movable contact,
‘the means causing the arc extinguishing gas to ?ow under
disengageable connecting means between said carriage
pressure through the nozzle is a piston within the tubular
means and said ?rst [arcing contact for maintaining con
movable contact at its closed end and ‘guided on the
tact engagement between said ?rst and second arcing
second arcing contact, spring means bias the disc and
contacts during the initial movement toward ‘open posi 50 piston apart, and means extending from the second ter
tion of said operating means vand said movable contact,
minal cooperate with said piston to hold the same sta
trip means cooperating with said connecting means after
tionary while said movable contact continues to move
said movable contact has ‘disengaged said stationary con
toward open position.
tact to disengage said connecting means vfrom said ?rst
17. The invention, as set forth in claim 16, wherein
arcing contact whereupon said ?rst arcing contact is 55 the means extending vfrom the second terminal to hold
moved by said biasing means away from said second
the piston stationary include a plurality of push rods ex
arcing contact to interrupt the circuit between said ?rst
and second terminals, \a nozzle slidably mounted within
tending through the closed end of the tubular contact
‘and having sliding telescoping ‘engagement with rods ex
tending from the second terminal.
said tubular movable contact on said second arcing con
.tact for directing a flow ‘of said ‘are extinguishing gas to 60
18. The invention, ‘as ‘set forth in claim 16, wherein
the space between said arcing contacts, means biasing
a ‘check valve is mounted on the piston and opens to
said nozzle outwardly of said tubular movable contact
maintain communication between opposite sides thereof
to surround a substantial part of said space ‘and the are
duringmovemcnt thereof away from the disc carrying
drawn therein on opening movement of said movable
the nozzle vduring the initial movement of the movable
contact, ‘and means operated by said operating means 65 contact to closed position.
to cause said arc extinguishing gas to ?ow under pres
sure through said nozzle into said space.
15. In a circuit interrupter, in combination, a ?uid
No references cited,
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