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Патент USA US3070684

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Dec. 25, 1962
w. A. sussow
3,070,674
swmm CONSTRUCTION
Filed March 3. 1960
13 Sheets-Sheet 1
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Dec. 25, 1962
3,070,674
w. A. eussow
swncu CONSTRUCTION
Filed March 5, 1960
l3 Sheets-Sheet 2
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Dec. 25, 1962
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SWITCH CONSTRUCTION
Filed Ma-rch 3, 1,960
15 Sheets-Sheet s
Dec. 25, 1962
3,070,674
W. A. GUSSOW
SWITCH CONSTRUCTION
Filed March 3. 1960
13 Sheets-Sheet 5
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Dec. 25, 1962
w. A. caussow
3,070,674
SWITCH CONSTRUCTION
Filed March 3. 1960
13 Sheets-Sheet 6
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Dec. 25, 1962
w. A. sussow
3,070,674
SWITCH CONSTRUCTION
Filed March 3. 1960
13 Sheets-Sheet 7
Dec. 25, 1962
w. A. GUSSOW
3,070,674
swI'rcH consmucnom
Filed March 3. 1960
l5 Sheets-Sheet 8
Dec. 25, 1962
w. A. eussow
3,070,674
SWITCH CONSTRUCTION
Filed March 3, 1960
15 Sheets-Sheet 9
Dec. 25, 1962
w. A. eussow
3,070,674
SWITCH CONSTRUCTION
Filed March 3. 1960
l3 Sheets-Sheet 10
Dec. 25, 1962
W. A. GUSSOW
3,070,674
SWITCH CONSTRUCTION
Filed March 3. 1960
13 Sheets-Sheet 11
Dec. 25, 1962
W. A. GUSSOW
3,070,674
SWITCH CONSTRUCTION
Filed March 3, 1960
15 Sheets-Sheet 12
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v////
Dec. 25, 1962 _
W. A. GUSSOW
3,070,674
SWITCH CONSTRUCTION
Filed March 3, 1960
1s Sheets-Sheet 15
175
5/5
United States Patent 0 "ice
3,070,674
Patented Dec. 25, 1962
2
1
sure contact engagement with its line contact member in
3,070,674
SWITCH CONSTRUCTION
predetermined timed relation to the rotation of the one
_
switch blade.
William A. Gussow, St. Petersburg, Fla., assignor_ to
'
Other objects of this invention will, in part, be obvious
S & C Electric Company, Chicago, Ill., a corporation
and in part appear hereinafter.
This invention is disclosed in the embodiment thereof
of Delaware
Filed Mar. 3, 1960, Ser. No. 12,529
15 Claims. (Cl. 200—48)
This invention relates, generally, to high voltage and
high current electric switches for high Voltage electric
shown in the accompanying drawings and it comprises the
features of construction, combination of elements and
arrangement of parts that will be exempli?ed in the con
struction hereinafter set forth and the scope of the applica:
tion of which will be indicated in the appended claims.
For a more complete understanding of the nature and
scope of this invention, reference can be had to the ‘fol
lowing detailed description, taken together with the ac
power transmission lines such as 69 kv. and above, and
it has particular relation to such switches provided with
means for interrupting load current without external arc
ing. This invention constitutes an improvement over the
invention disclosed in application Serial No. 704,397, ?led 15 companying drawings, in which:
FIGURE 1 is a view, in side elevation, of one pole
December 23, 1957, now Patent No. 3,030,481, issued
of a three pole high voltage load interrupter disconnect
April 17, 1962, and assigned to the assignee of this ap
ing switch mechanism in which the present invention is
plication.
Among the objects of this invention are: To provide
embodied;
FIGURE 2 is a top plan view of the construction
for sequentially opening and closing a pair of series con
shown in FIGURE 1;
nected disconnecting switch blades and load'interrupter
FIGURE 3 is a horizontal sectional view taken gen
contacts in parallel with one of the switch blades in a
new and improved manner; to complete the circuit by
erally along the line 3—3 of FIGURE 1 and showing
certain of the details of the switch operating mechanism
for rotating the intermediate insulator;
FIGURE 4 is a top plan view, at an enlarged scale, of
the mechanism housing and the rotatable mountings there
closing the switch blade in parallel with the interrupter
contacts followed by closure or" the interrupter contacts;
to provide for effecting such sequential operation using
beaver tail type switch blades with a minimum of mov
ing parts exposed to icing thereby reducing the likelihood
on for the switch blades;
FIGURES 5A, 5B and 5C taken together and placed
of improper functioning under adverse operating condi
tions; to accomplish the circuit opening operation by ro 30 in endwise relation in the order named show a vertical
longitudinal sectional view through the load interrupter,
tating in one direction an operator, such as an insulator
the contacts being shown in the closed positions;
FIGURE 6 is a vertical sectional view taken generally
along the line 6—6 of FIGURE 4, certain of the parts
on which the beaver tail type switch blades and a part of
the load current interrupter are mounted, ?rst to rotate
one switch blade out of high pressure contact engage
being shown generally in the positions that they occupy
in the switch closed position and other parts being shown'
in the plane of the drawing to show the relationship ‘be
ment with its line contact member and then to swing it
to a position relative thereto where the arc cannot be
restruck therebetween, then tripping a spring to operate
the contacts of the load interrupter to open the circuit,
then rotating the other switch blade out of high pressure
contact engagement with its line contact member, then
tween the parts illustrated;
~
FIGURE 7 is a top plan view, with certain parts be
ing broken away and others omitted, of the operating
recocking the spring and ?nally swinging the switch blades
mechanism, the parts being shown generally in their rela~v
to open circuit positions at right angles to their closed
circuit positions during the remainder of the rotation of
the insulator in the one direction; to accomplish the cir
tionship for the switch closed position;
FIGURE 8 is a view, similar to FIGURE 7, showing
the positions of certain parts of the operating mechanism
after rotation of the main shaft through 22° from the
cuit closing operation by rotating the insulator in the op
posite direction and thereby moving the beaver tail type
45 position shown in FIGURE 7;
switch blades at different speeds to the end that said other
switch blade is moved into high pressure contact engage
ment with its line contact member followed by swinging
of the one switch blade into contact engagement with its
line contact member to complete the circuit and, during 50
-
FIGURE 9 is a view, similar to FIGURE 7, showing
the positions of certain parts of the operating mechanism
after rotation of the main shaft through 581/2° from the
position shown in FIGURE 7, the interrupter contacts
being open and the operating springs recocked;
FIGURE 10 is a view, similar to FIGURE 7, showing
the positions of certain parts of the operating mechanism
after rotation of the main shaft through 113° from the’
position shown in FIGURE 7;
the remainder of the rotation of the insulator, closing the
load interrupter contacts and rotating said one switch
blade into high pressure contact engagement with its line
contact member; to operate the one switch blade and the
FIGURE 11 is a vertical elevational view, at an en
contacts of the load current interrupter by direct me 55
larged scale, showing the layout of the cross head which
chanical drive from the rotatable insulator and to operate
is operated by the switch operating mechanism for
the other switch blade through a Geneva gear mecha
opening the contacts of the load current interrupter
nism; to prevent any rotation of the other switch blade
and for thereafter reclosing them, the closed position
during the initial portion of the rotation of the insulator
of the cross head being shown by full lines and the
in the sWitch opening direction; to operate a beaver tail
open position corresponding to the open position of the
type of switch blade into and out of high pressure con
t contacts of the load interrupter being shown by broken
tact engagement with a line contact member through the
agency of a Geneva gear mechanism; to lock the beaver
tail type of switch blade in high pressure contact engage~
ment with a line contact member during an initial part
of the rotation of the switch blade operating mechanism;
and to movably mount two beaver tail type switch blades
on a common support and to move one of them into and
lines;
FIGURE 12 is a vertical sectional view taken gen
erally along the line 12—12 of FIGURE 11 and turned
through 90° in order to place it on the sheet where it
appears;
FIGURE 13 is a partial elevational view at an en
out of high pressure contact engagement with its line
larged scale showing the relationship between the main
contact member and through a Geneva gear mechanism 70 and auxiliary shafts and the Geneva drive mechanism
move the other switch blade into and out of high pres
therebetween;
3,070,674
3
FIGURE 14 is an enlarged view, partly in side eleva
tion and partly in section, showing the interrupter clos
4
is a ?rst line contact member 29 which includes a pair
of inverted U-shaped contact members 30. In like
ing push rod;
manner a second line contact member 31 is mounted at
FIGURE 15 is a top plan view of the interrupter
trip actuator which is keyed to and therefore rotates
the upper end of the second insulator 19‘ and it is pro
vided with inverted U-shaped contact members 32.
with the main shaft; and
FIGURE 16 is a view which shows a development
Arcing horns 33 and 34 are provided on the ?rst and
second line contact members ‘29 and 31 for the usual
of the depending ?ange forming an integral part of the
interrupter trip actuator, shown in FIGURE 15, to show
purposes.
Cooperating with the ?rst and second line
contact members are a ?rst switch blade 35 of beaver tail
in more detail the relative location of the Operating 10 type having a beaver tail contact 36 for engagement
shoulder on this depending ?ange.
with the inner ?exible arms of the contact members 30
and a second switch blade 37, also of beaver tail type,
Referring now particularly to FIGURES 1, 2 and 3
having a beaver tail contact 38 for likewise engaging the
of the drawings, it will be observed that the reference
inner ?exible arms of the inverted U-shaped contact
character 10 designates, generally, a switch base. The
switch base 10 can be formed of a pair of back-to—back 15 members 32. Arcing tips 39 and 40 extend endwise
from the ?rst and second switch blades 35 and 37 for
rolled steel channel sections 10’ interconnected by trans
engaging the arcing horns 33 and 34, respectively, to
verse plates 11, 12 and 13 on which support ?ttings
provide the ?nal break and the initial make as the re
14, 15 and 16 are mounted. It will be observed that
spective switch blades "35 and 37 are moved out of and
the ?tting 15 is rotatably mounted on the transverse
plate 12 while the ?ttings 14 and 16 are stationarily 20 into switch closed positions.
mounted on the transverse plates 11 and 13, respectively.
Provision is made, as disclosed in more detail in US.
First, intermediate and second insulators 17, 18 and 19
Patent 2,818,474, issued December 31, 1957, for rotating
the ?rst and second switch blades 35 and 37 about their
are mounted on the support ?ttings 14, 15 and 16, re
longitudinal and transverse axes into and out of high
spectively. It will be observed that the intermediate
insulator 18 is rotatable about a vertical axis in the 25 pressure contact engagement with the ?rst and second line
switch position shown in the drawings together with
the support ?tting 15 while the ?rst and second insulators
contact members 29 and 31. The switch blades 35 and
37 are mounted in this manner on a mechanism housing
17 and 19 are stationarily mounted on the support ?ttings
43 of conducting material, such as aluminum, which is
14 and 16 respectively.
supported on the intermediate insulator 18 at its upper
Any suitable means can be provided for rotating the 30 end. As will appear hereinafter, provision is made for
holding the mechanism housing 43 stationary with re
support ?tting 15 in order to rotate the intermediate
spect to the intermediate insulator 18. On opposite sides
insulator 18 through the necessary extent to effect the
operation of the switch for opening and closing the
of the mechanism housing 43 are brackets 44- and 45
which extend upwardly for receiving blade carriers 46 and
circuit in the manner hereinafter set forth. For illus
47 that are pivoted about horizontal axes 48 and 49 ex
trative purposes it is pointed out that provision is made
for rotating the intermediate insulator 13 through 113°
from the switch closed position to the switch open posi
tion and vice versa. For rotating the intermediate
insulator 18 an arm 20 extends radially from the ?tting
15 as shown in FIGURE 3 and it is pivotally connected
at 21 to one end of a clevis member 22 which is pivotally
connected at the other end at 23 to an arm 24 which
tending through the brackets 44 and 45. Bearings 50 and
51 are carried by the blade carriers 46 and 47 for ro
tatably mounting the adjacent ends of the ?rst and second
switch blades 35 and 37. With a view to rotating the
switch blades 35 and 37 about their longitudinal axes in
the bearings 50 and 51, clamp portions 52 and 53 are
secured to them adjacent these bearings having arms 54
and 55 extending therefrom. The arms 54 and 55 are
extends from and rotates with a shaft 25 that is journaled
pivoted at 56 and 57 to clevises 58 and 59 from which
on a bearing 26 which is carried by the channel sections
links 60 and 61 extend for connecting them to sockets 62
10’ forming the switch base 10. It will be observed
that the bearing 26 is mounted on a transverse plate 45 and 63 with which upstanding pins 64 and 65 inter?t.
The pins 64 and 65 are carried by ?rst and second switch
27 secured to and extending between the channel sec
cranks ‘66 and 67 that are arranged to rotate in hori
tions 10’. An arm 28 is secured to and rotates with
zontal planes. The ?rst switch crank 66 is associated
the shaft 25 and is arranged to be connected at its outer
with the ?rst switch blade 35 and is operable to effect
end to an interphase rod (not shown) which serves to
effect the simultaneous operation of the other two poles 50 its rotation about its longitudinal axis and also about a
transverse axis into and out of high pressure contact
of the switch construction in the manner set forth in
engagement with the ?rst line contact member 29. The
the application above referred to. Since the present
?rst switch crank 66 is keyed to and rotates with a main
invention is embodied in the construction of a single
pole unit, the multiple pole construction has not been 55 shaft 68 that is journaled in the mechanism housing 43.
The second switch crank ‘67 is keyed to and rotates with
shown herein. It will be understood that the ratchet
an auxiliary shaft 69, parallel to the main shaft 68 and
mechanism disclosed in the application above referred
journaled in the mechanism housing 43. As will appear
to can be employed in conjunction with the movement
hereinafter when the auxiliary shaft 69 and therewith
of the arm 28 from one position to the other if such
the second switch crank 67 rotates through 85° from
operation is desired.
60 the switch closed position shown in FIGURE 2, the
For illustrative purposes the switch base 10 is Shown
in a horizontal position with the ?rst, intermediate and
second insulators 17, 18 and 19 extending upwardly
therefrom. It will be understood that the switch base
second switch blade 37 is rotated out of high pressure
contact engagement with the second line contact member
31 and into a position at right angles to the horizontal
switch closed position. As will be pointed out herein
10 can be located in a vertical position where the in
65 after, the driving connection between the main shaft 68
sulators 17, 18 and 19 would extend horizontally one
and the auxiliary shaft 69 is such that, during the ?rst
above the other. Also the insulators 17, 18 and 19 can
40° of rotation of the former in a counterclockwise di
depend from the switch base 10 where an underhung
rection from the switch closed position together with the
construction is desired. Thus, where there is a refer
first switch crank 66, no rotation of the auxiliary shaft
ence herein to upper and lower locations it will be under
stood that they are with reference to the particular 70 69 or second switch crank 67 occurs. During this 40°
arrangement shown, it being understood that other
rotation of the main shaft ‘68 and the ?rst switch crank
locations can be employed, as described.
66, the ?rst switch blade 35 is rotated out of high pres
Mounted at the upper end of the ?rst insulator 17,
sure contact engagement with the ?rst line contact mem
as shown in FIGURES 1 and 2 of the drawings, there 75 ber 29 and is swung away therefrom. During the re
3,070,674
5
6
maining 73° of counterclockwise rotation of the main
suitable nuts and lock washers serve to interconnect the
shaft 68 and the ?rst switch crank 66 the opening move
ment of the ?rst switch blade 35 is completed and the
auxiliary shaft ‘69 and the second switch crank 67 are
rotated in a clockwise direction through 85° to rotate
the second switch blade 37 out of high pressure contact
juxtaposed bushing flanges 85 and 86. At the left end
of the load current interrupter 80, the studs 86’ serve to
interconnect the bushing ?ange 85' to the terminal plate
82 while at the right end the studs 36' serve to intercon
engagement with the second line contact member 31 and
nect the vbushing ?ange 86 to the adapter 83. Passage
ways 87 are provided between the bushing ?anges 85 and
to swing it away therefrom. At the termination of these
switch opening movements the ?rst and second switch
load current interrupter 80 and discharge thereof to the
86 for the escape of the are products on operation of the
blades 35 and 37 extend upwardly in parallel relation.
10 atmosphere.
Within the central portion of the terminal plate 82 and
‘If desired, counterbalancing springs can be provided,
within each of the central portions of the bushing ?anges
as described in the application above referred to, for the
86 there is provided a stationary interrupter contact sleeve
?rst and second switch blades 35 and 37. Covers 70 and
88 which is held in place and against rotation in each case
71 overlie these counterbalancing springs when they are
used.
15 by set screws 89. Formed integrally with and extending
drawings the main shaft 68 is journaled in the mechanism
housing 43 and projects from the under side thereof into
to the right of each interrupter contact sleeve 88 are con
tact ?ngers 90. The contact ?ngers 90 extend into a
metallic Vent chute 91 which is held in place on the re
an operator 72 in the form of a ?tting that is bolted to
spective bushing ?ange 85 by bolts 92. Extending from
As shown more clearly in FIGURES 1 and ‘6 of the
Set 20 the metallic vent chute 91 is a removable cartridge, shown
generally at 93, which is surrounded by a cylindrical in
screws 73 extending radially through an upstanding ?ange
sulating housing 94 that may be formed of a phenolic
of the operator '72 into the lower end of the main shaft
the upper end of the intermediate insulator 18.
condensation product and secured by radially extending
68 and a key 72’ serve to interconnect these parts.
screws 95 to the metallic vent chute 91. The replace
It is desirable to limit the extent of movement of the
switch cranks 66 and 67 for the switch closed and open 25 able cartridge 93 includes an insulating retaining ring 96.
In order to provide a gas tight relationship an 0 ring 97
positions. As shown in FIGURE 4 of the drawings,
stops 74 and 75 project upwardly from the top of the
mechanism housing 43 for determining the positions of
the ?rst and second switch cranks 66 and 67, respectively,
is interposed between the outer end of each metallic vent
chute 91 and the associated surface of the respective bush~
ing ?ange 85. For the same purpose another 0 ring 97’
in the switch closed positions where the ?rst and second 30 is interposed between the juxtaposed portions of the cylin
switch blades 35 and 37 are in the high pressure contact
drical housing 94 and the insulating retaining ring 96
engaging positions with the respective ?rst and second
which forms a part of the replaceable cartridge 93. Se
cured to and extending from the insulating ring 96 is an
line contact members 29 and 31. The positions of the
?rst and second switch cranks ‘66 and 67 here are shown
insulating sleeve 98, preferably formed of ?ber, within
by full lines. The positions of the ?rst and second switch 35 which there is provided a stack 99 of ?ber washers. ' The
stack 99 of ?ber washers is cemented ‘in place within
cranks 66 and 67, corresponding to the open positions
the insulating sleeve 98 audit provides a longitudinally
of the ?rst and second switch blades 35 and 37, are shown
by dot and dash lines. Stops 76 and 77 are provided for
extending bore 100 in which the arc is drawn and extin
limiting the movement of the ?rst and second switch
guished.
cranks 66 and 67 to these positions. ‘In the open posi 40
The are is drawn in each bore 100 from the associated
contact ?ngers 90 by a contact tip 101 that is movable
tions of the ?rst and second switch blades 35 and 37, they
extend parallel to each other and at right angles to the
through the bore 100. The contact tips 101 are mechani;
cally interconnected so that they move simultaneously
‘switch closed positions shown in FIGURE 1 of the draw
through the respective bores 100 and, when four interrupt
The ?rst switch blade 35 is positioned mechanically 4.5 er units 81 are provide, four arcs are drawn and four
mgs.
and electrically in parallel circuit relation with a load
current interrupter that is indicated, generally, at 80. The
load current interrupter 80 is interposed between the ?rst
line contact member 29 and the mechanism housing 43
gaps are provided in the load current interrupter 80 when
these arcs are extinguished. Extending from each of
three of the contact tips 101 is a tubular moving contact
extension 102 that is slotted lengthwise and is provided
on which the ?rst and second switch blades 35 and 37 50 with openings 103 to permit the ?ow of the are products
are rotatably mounted. The load current interrupter 80
from the interior of each extension 102 into the bore 100
is formed of a number of interrupter units 81. For il
and thence through recesses 104, aligned with the con
lustrative purposes four interrupter units 81 have been
tact ?ngers 90 outwardly through the metallic arcing chute
shown. They correspond generally in construction and
91 and thence to the atmosphere through the passage
operation to the auxiliary contact constructions described 55 ways 87.
in the application above referred to. Generally the inter
It will be observed that the contact tips 101 are tubular
in construction. Telescoped within each contact tip 101
rupter units 81 are of identical construction, the number
used depending upon the voltage of the circuit to which
is a metallic sleeve 107 that is suitably secured thereto.
the switch construction is applied. The interrupter units
Telescoped Within the metallic sleeve 107 is one end of a
81 are of the type in which the arc drawn therein is ex 60 trailer rod 108 of insulating material. The metallic
tinguished in air. Other types, such as vacuum or gas
sleeve 107 is preferably secured by cement to the trailer
rod 108. In order to protect the trailer rod 108 from
?lled interrupter units, can be used instead of the par
ticular one disclosed herein.
the arc that is drawn between the contact ?ngers 90 and
the contact tip 101, an insulating sleeve 109 surrounds
FIGURES 5A~—5B—5C, placed end to end from left to
right, show the details of construction of the load current 65 the end of ‘the metallic sleeve 107 nearer to the vicinity
where the arc is drawn. The trailer rod 108 extends
interrupter 80. At the left end there is a terminal plate
through a tubular trailer 110 that is formed of a material,
82 which is secured by bolts 82’ to the ?rst line contact
such as methyl methacrylate resin, from which a suitable
member 29. At the right end there is a metallic adapter
arc extinguishing medium can the evolved when the arc
83 which is secured by bolts 83' to the mechanism hous
ing ‘43. A conducting gasket is interposed therebetween 70 is drawn for assisting in extinguishing it. At the outer
end of each trailer rod 108 there is provided a longitudi
to provide a good conducting path therebetween.
nally split trailer stop sleeve 111 that serves to hold the
Each of the interrupter units 81 includes an insulator
tubular trailer 110 in position and causes it to move con
bushing or housing 84 having at its left end a female
jointly with the trailer rod 108. The trailer stop sleeve
metallic bushing ?ange 85 and at its right end a male
metallic bushing ?ange 86. As shown, studs 86" with 75 111 is formed of insulation and is secured to the trailer
8,070,674
8
rod 188. To the left of each of the trailer stop sleeves
111 there is a metallic trailer hitch socket 112 for the
purpose of facilitating mechanical interconnection to the
the drawings the manner in which the cross head 128 is
mounted is shown more clearly. It will be observed that
the left side of the cross head 128 is provided with a
adjacent contact tip 1'81 by telescopic engagement with
convex curved surface 137 that is arranged to be engaged
the adjacent end of ‘the tubular moving contact extension 5 by fork extensions 138 of an operating spring arm 139,
102 of the next unit. The exposed trailer hitch socket
FIGURE 6, which extends radially from an operating
112 at the left end, as shown in FIGURE 5A, is provided
with a cover sleeve 112’. In order to interconnect each
tubular moving contact extension 182 to the adjacent sta
tionary interrupter contact sleeve 88 contact followers 113
are provided having contact ?ngers 114 which bear against
the inner surface of the next contact sleeve 88.
When the contact tips 101 of the interrupter units 81
are separated from their cooperating contact ?ngers 91),
it is desirable that the voltage there-between be distributed
uniformly across the several interrupter units 81. For
this purpose a voltage distributing resistor 117 is provided
within each insulator bushing or housing 84. The volt
spring socket 140' that is freely rotatably mounted on the
main shaft 68. As will appear hereinafter provision is
made for biasing the operating spring arm 139 to open the
contacts of the load current interrupter 80 at high speed.
Referring again to FIGURES 11 and 12 of the drawings
it will be observed that the upper fork extension 138 is
beveled at 141 for engaging a beveled latch release surface
142 of a latch 143 which is pivoted at 144 on a latch
support 145. The latch 143 has a latch surface 146 that
is arranged, as shown by full lines, to be placed to the
right of the cross head 128 for the purpose of holding
it in the position corresponding to the closed position of
age distributing resistors 117 are of conventional construc
the load current interrupter 80. A coil spring 147 serves
tion and are formed by applying a high resistance ?lm on 20 to bias the latch 143 to the latched position. As the fork
the outer surface of a cylindrical insulator and then silver
coating the inner surfaces at the ends and connecting
the silver coating to the resistance coating on the exterior
for contact engagement by contact ?ngers 118 and 119
extensions 138 move to the right, as described hereinafter,
the beveled surface 141 engages the beveled latch release
surface 142 and lifts the latch 143 to move the latch sur
face 146 out of the path of the cross head 128 followed
which are connected respectively to the ends of each of 25 by engagement of the right sides of the fork extensions 138
the interrupter units 81. As shown, the contact ?ngers
with the convex curved surface 137 to initiate and com
118 are connected to the respective metallic vent chutes
plete the opening movement of the cross head 128 and in
91 at the left end and the contact ?ngers 119 are con
terrupter contact operating tube 127. The right end or
nected to the respective bushing flanges 86 at the right
nose portion 148 of the latch 143 is provided with an in
end.
clined approach surface 148' for engaging the left side of
Since the interrupter unit 81 at the right end of the load
the upper fork extension 138 when it is moved to the left
current interrupter 80, as shown in FIGURE 5C, is adja
for lifting the latch 143 upwardly sufficiently far to clear
cent the mechanism housing 43, a slightly different con
struction is provided for connection to the contact tip
the upper end of the cross head 128.
At the right end of FIGURE 11 the position of the
cross head 128 in the open position is shown by broken
101 in order to interconnect it with the operating mecha~
nism within the mechanism housing 43. It will be ob
lines. In order to move the cross head 128 from the open
served that a tubular moving contact extension 120 is
provided in the form of an unperforated tube and is
suitably mechanically connected to the contact tip 101.
At the right end of the contact extension 120‘ there is tele
scoped one end of a plug 121 which is secured in position
position to the closed position as shown at the left of
FIGUREYll by full lines, a roller 149 is mounted on a pin
150 which is carried by fork extension 151 of an inter
rupter closing lever 152 the details of construction of
which are shown more clearly in FIGURE 14 of the draw
by pins 122 extending at right angles to each other.
mgs.
The movement of the cross head 128 and of the inter
Threaded on the plug 121 is a coupling sleeve 123 and it
is surrounded by an insulating band 124 to prevent elec
trical contact between the coupling sleeve 123 and a
rupter contact operating tube 127 is guided by guide rods
153 which extend transversely of the mechanism housing
metallic sleeve 125 that extends through the bushing
43 land in which they ?oat at the ends in drilled holes in
?ange 86 and corresponds to the contact sleeves 88 previ
the walls thereof. As shown in FIGURE il 1, bolts 154
ously referred to. The coupling sleeve 123 forms a part
and suitable lock nuts hold the guide rods 153 endwise
of a quick detachable coupling 126 between the contact
in place. It will be understood that the cross head 128
extension 120 and an interrupter contact operating tube 50 is apertured to receive the guide rods 153 and that it is
127 which extends through the adapter ‘83 and a side
slidably mounted thereon. Set screws 155, FIGURE 12,
extending into the guide rods 153 from the latch support
wall of the mechanism housing 43 for connection to the
145 serve to prevent them from rotating about their longi
operating mechanism therein in a manner to be described
hereinafter. At its right end the interrupter contact operat
tudinal axes. In order to absorb the shock incident to the
stopping of the cross head 128 in the open position as
ing tube 127 is provided with a cross head 128 for opera
tion by the mechanism in the mechanism housing 43.
shown by the broken lines at the right of FIGURE 11,
In order to provide access to the quick detachable cou
Washers of shock absorbing material 156 are mounted on
the right ends of the guide rods 153 for engagement by
pling 126 when the interrupter contact operating tube 127
the right side of the cross head 128. Stop pins 157, ex
is moved to the open circuit position where the quick de
tachable coupling 126 is shown by broken lines, removable 60 tending into the guide rods 153, are arranged to be en
cover plates 129 are provided on the adapter 83. The
cover plates 129 are held in position by screws 130. As
shown in FIGURE 5A a cover plate 131 is provided on
gaged by the curved surface 137 of the cross head 128
for limiting its movement and thereby of the interrupter
contact operating tube 127 in the closed direction. It is
desirable that there be a low conductivity path between
the terminal plate ‘82 and is held in place by bolts 132.
When the interrupter contact operating tube 127 is moved 65 the cross head 128 and the mechanism housing 43. For
this purpose a shunt 158 is secured by screws 159 to the
to the open circuit position with the quick detachable
lower end of the cross head 128 and, as shown in FIG
coupling 126 located within the adapter 83, as shown by
URE 6, is secured by screws 160 at the other end to the
broken lines, on removal of the cover plates 129, the cou
mechanism housing 43.
pling 126 can be detached from the tubular moving con
It has been pointed out hereinbefore that the main
tact extension 126‘. Then, on removal of the cover plate 70
shaft 68 is rotated by the intermediate insulator 18 for
131 mounted on the terminal plate 82, the contact tips
effecting a corresponding rotation of the ?rst switch crank
101 and associated parts including the tubular trailers 110
66 and thereby operation of the ?rst switch blade 35.
can be removed as a unit for repair, replacement or merely
inspection as may be desired.
Also it has been pointed out that the auxiliary shaft 69,
Referring now particularly to FIGURES 11 and 12 of
mounted in parallel relation on the mechanism housing
3,070,674
10
43, is arranged to rotate the second switch crank '67 for
thereby rotating the second switch blade 37. The ar
rangement is such that the ?rst switch blade 35 is ro
tated out of high pressure contact engagement with the
?rst line contact member 29 in order to place the load
current interrupter 80 in series with the circuit so that,
on further rotation of the main shaft 68, the contacts of
cured by a key 183, FIGURE 6, to the main shaft 68
and thus rotates vtherewith. Referring again to FIGURES
l5 and 16, it will be observed that the trip edge 180 .18
located at one end of the depending ?ange portion or trlp
segment 181 that is formed integrally with the interrupter
trip actuator 182. The arcuate length of the trip segment
181 is about 43° and it serves to hold the trip ?nger 175
and thereby the trip latch 172 in the unla-tched position
the load current interrupter 80 are opened to interrupt
as long as the outer end of the trp ?nger 175 engages the
the flow of current in the circuit while the second switch
‘
blade 37 still remains in high pressure contact engage 10 outer surface of the trip segment 181.
Also forming an integral part of the interrupter trip
ment with the second line contact member 31. There
actuator 182 and therefore movable therewith is a radial
after, the auxiliary shaft 69 is rotated in order to rotate
ly extending arm 187 which is provided with a push bolt
the second switch blade 37 out of high pressure contact
188 that is arranged, as shown in FIGURE 7 of the draw
engagement with the second line contact member 31 so
that, in addition to the air gaps provided in the circuit 15 ings, to engage a shoulder 189 on the operating vspring
arm 139. The purpose of this construction is to return
by the separation of the contacts of the load current in
the operating spring socket 140 and parts associated there
terrupter 80, a large air gap is provided on movement
with to the initial position and to recock the springs 167
of the second switch blade ‘37 to the open positionat
and 168. The interrupter trip actuator 182 also is pro
right angles to its normally closed position. It remalns
to point out the apparatus for performing these operations 20 vided with a pair of radially extending arms 190 be
tween which there extends a pin 191 on which ‘a roller
and how the auxiliary shaft 69 is driven in timed rela
192 is mounted.
tion from the main shaft 68.
As shown in FIGURE 7, the roller 192, which is mov
Referring particularly to FIGURE 6 of the drawings
able with the interrupter trip actuator 182, is arranged to
it will be observed that a spring base 164 is rotatable on
the main shaft 68. The spring base 164 is arranged to 25 engage ‘an arm 196 which is freely rotatably mounted on
a shaft 197, FIGURE 14, which is mounted in the mech
be held stationary with respect to the mechanism hous
anism housing 43. Also mounted on the shaft 197 is a
ing 43 in any one of several di?erent ‘angular positions
sleeve 198 which is an integral part of the interrupter
by a locking bolt 166'. The reason for adjustably mount
closing lever 1152 which carries the roller 149‘ between
ing the spring base 164 is to vary the operating tensions
of inner and outer coil springs 167 and 168 which are 30 the fork extensions 1'51 at its outer end for engaging the
right side of the cross head 128, FIGURE 11, to move it
connected at one end to the spring base 164 and at the
to the closed position corresponding to the closed posi
other end to the operating spring socket ‘140 from which
tion of the load current interrupter 80. Also integral
the operating spring arm 139 extends radially and car
with the interrupter closing lever 152 is an arm 199,
ries at its outer end the fork extensions 138 which are
arranged to engage the cross head 128, FIGURE 11, ‘for 35 FIGURE 7, through which an adjusting bolt 200 extends.
By adjusting the bolt 200 the spacing between the arm
moving the interrupter contact operating tube 127 to the
open position and opening the contacts of the interrupter
196 and the arm 199 can be ‘varied in turn to vary the
units 81 of the load current interrupter 80.
relationship between the positions of the roller 192 mov
As shown more clearly in FIGURE 7 of the drawings
able with the interrupting trip actuator 182 and the inter
the operating spring socket 140 together with the operat 40 rupter closing lever 152. A leaf spring 201 serves to
ing spring arm 139 formed integrally therewith is shown
bias the arm 196 into engagement with the adjusting bolt
in the cocked position with the springs 167 and 168 fully
stressed. Extending radially from the operating spring
200. A coil spring 202, surrounding the lower portion
that is ‘arranged to engage a shoulder 177 on the trip
on which ‘an auxiliary Geneva roller 212 is mounted.
of the sleeve 198, FIGURE ‘14, serves to bias the inter
socket 140 opposite the operating spring arm ‘139 is an
rupter closing lever 1-52 in a clockwise direction as viewed
arcuate trip cam ‘169 which has a shoulder 170 that is 45 in FIGURE 7. An adjusting bolt 203 intermediate the
engaged by a shoulder 171 of a trip latch 172 which is
ends of the interrupter closing lever r152 determines the
pivoted on a stub shaft 173 that is carried by the mecha
extent to which it can swing in a counterclockwise direc
nism housing 43. A spring 1714 urges the trip latch 172
tion.
in a counterclockwise direction, as viewed in ‘FIGURE
'The driving connection between the main shaft 68 and
7, to permit the shoulder 171 thereon to move into latch 50 the auxiliary shaft 69 is through the agency of a Geneva
ing engagement with the shoulder 170 when the operat
gear drive that is shown generally at 206 in FIGURE 7.
ing spring socket 140 is restored to the cocked position
The Geneva gear drive 206 includes a pair of Geneva
shown in {FIGURE 7. The trip latch 172 is operated by
driver arms 207 that are secured by a key 208, FIGURE
a trip ?nger 175 which also is pivotally mounted on the
6, to the main shaft ‘68 and therefore rotate therewith. A
stub shaft 173. As shown in FIGURE 6, the trip ?nger
pin 209 extends through the outer ends of the driver arms
175 is journaled on an upstanding sleeve portion of the
207 and a main Geneva roller 210 is mounted thereon.
trip latch 172. The trip ?nger 175 has a shoulder 176
Upstanding from the upper driver arm 207 is a pin 211
latch 172. Thus, when the trip ?nger 175 is rotated in
The auxiliary Geneva roller 212 is arranged, as shown in
a clockwise direction, its shoulder 176 engaging the shoul 60 FIGURE 7, when the ?rst and second switch cranks 66
der 177 on the trip latch 172, causes rotation of the lat
ter and moves the shoulder 171 out of the path of the
shoulder 170 on the arcuate trip cam 169 and permits the
operating spring socket v140 to be rotated in a clockwise
and 67 are in the positions corresponding to the closed
and locked positions of the ?rst and second switch blades
35 and 37 to engage a depending shoulder 213 of an
auxiliary Geneva cam arm 214 which, as shown, in FIG
direction under the in?uence of the coil springs 167 and 65 URE 6, is secured by a key 215 to a sleeve 216 that is
168. The trip latch 172 is held in the unlatched position
secured by a key 217 to the auxiliary shaft 69. Thus the
by engagement with the outer periphery of the ‘arcuate
auxiliary Geneva cam arm 214 and the sleeve 216 rotate
trip cam 169. A coil tension spring 178 interconnects
conjointly with the auxiliary shaft 69‘. Since the roller
the trip latch 172 and the trip ?nger 175 and serves to
212 is in the path of the depending shoulder 213, as the
hold the shoulder 176 of the latter in engagement with
main shaft 68‘ rotates and carries with it the pair of
70
the shoulder 177 of the trip latch 172.
Geneva arms 207 and the auxiliary Geneva roller 212,
The trip ?nger 175 has a shoulder 179 that extends
the auxiliary Geneva cam arm 214 is held stationary by
radially thereof into the path of a trip edge 180 on a de
the interaction between the roller 212 and the depending
pending ?ange portion or trip segment 181, ‘FIGURES
shoulder 213. It will be noted that the depending shoul
15 and 16, of an interrupter trip actuator 182 that is se 75 der 213 forms one side of a slot 218 that opens down;
3,070,674
11
wardly below the auxiliary Geneva cam arm 214. The
other side of the slot 218 is formed by a shoulder 219.
The continued rotation of the pair of Geneva driver
arms 207 with the main shaft 68 causes the auxiliary
Geneva roller 212 to move beyond the shoulder 213 and
out of the slot 218. When this takes place, the main
Geneva roller 210 moves into an arcuate slot portion 222
12
are stressed or fully cocked. As shown in FIGURE 7,
the auxiliary Geneva roller 212 engages the shoulder 213
on the auxiliary Geneva cam arm 214 and thus holds the
second switch crank 67 and thereby the second switch
blade 37 in locked high pressure contact engagement with
the second line contact member 31. The parts within
the mechanism housing 43 generally are as illustrated in
that is located between arms 223 and 224 of a main
FIGURE 7 with the trip latch 172 engaging the shoulder
Geneva cam 225 which is integral with the sleeve 216.
170 of the trip cam 169‘ to hold the interrupter trip actu
Thus the main Geneva cam 225 rotates conjointly with 10 ator 182 against rotation under the biasing action of the
the auxiliary Geneva cam arm 214. While the main
coil springs 167 and 168.
Geneva roller 210 is moving through the arcuate slot
In opening the switch, the arm 28, FIGURE 3, is to
portion 222 in the main Geneva cam 225, since the center
tated in a clockwise direction from the over center toggle
of this arcuate slot portion 222 is the axis of rotation
locked position to rotate the arm 20‘ and thereby the
of the main shaft 68, no rotary movement of the main 15 intermediate insulator 18 in a counterclockwise direction.
This rotates the main shaft 68, FIGURE 2, in the same
take place. While the main Geneva roller 210‘ is moving
direction. After the main shaft 68 has rotated through 9°
through the arcuate slot portion 222, the second switch
and therefore the ?rst switch crank 66 has rotated a simi
crank 67 is held stationary and likewise no movement of
lar extent to the position shown by the broken lines in
the second switch blade 37 takes place. On continued 20 FIGURE 4, the ?rst switch blade 35 is rotated about its
rotation of the pair of Geneva driver arms 207 with the
longitudinal axis to the center position here shown. Thus
main shaft 68, the main Geneva roller 210 engages the
the ?rst switch blade 35 has been moved from the locked
outer end of a radial slot portion 226 between the arms
position to the center position and still is in high pressure
223 and 224. Further rotation of the main shaft 68
contact engagement with the ?rst line contact 29. Mean
directly elfects rotation of the main Geneva cam 225 and
while the auxiliary shaft 69‘ remains motionless and the
thereby rotation of the auxiliary shaft 69 to rotate the
second switch blade 37 remains in the closed and locked
second switch crank 67. This action rotates the second
position.
switch blade 37 to unlocked position and then out of
The operator continues to rotate the operating mecha
high pressure contact engagement with the second line
nism attached to the arm 28 and thus continues the rota
contact member 31 followed by rotation of the second 30 tion of the main shaft 68 in a counterclockwise direction
switch blade 37 to the fully open position.
an additional ‘13° of through a total of 22° from the
It will be seen that the auxiliary Geneva roller 212 is
initial position. At this point the ?rst switch blade 35
used to hold the second switch blade 37 locked in closed
starts to swing about the horizontal pivot 48 since it has
Geneva cam 225 or rotation of the auxiliary shaft 69‘ can
position while the main shaft 68 keeps on rotating through
completed its rotation about its longitudinal axis out of
the ?rst 40° from the closed position of the ?rst switch
high pressure contact engagement with the ?rst line con
crank 66 and of the ?rst switch blade 35. The same
tact member 29. Now the ?rst switch blade 35 starts to
holding operation can be effected by extending the arcuate
swing away from the ?rst line contact member 29 toward
slot portion 222 to receive the main Geneva roller 210
the open position.
in the position that it occupies in FIGURE 7 and omitting
Meanwhile the auxiliary Geneva roller 212, FIGURE
the auxiliary Geneva roller 212 and associated parts. 40 7, is moving through the slot 218 on the underside of
However, this would require a substantial increase in the
the auxiliary Geneva cam arm 214 and, by engaging the
distance between the main shaft 68 and the auxiliary
shoulder 213, acts to hold the auxiliary shaft 69‘ and
shaft 69 together with an increase in the size of the oper—
parts connected thereto against any rotation. The sec
ating mechanism and of the mechanism housing 43.
ond switch blade 37 is held in locked high pressure con
The operation of the switch construction disclosed here 45 tact engagement with the second line contact member 31.
in will be readily understood from a consideration of the
As the auxiliary Geneva roller 212 moves through the
positions of the various parts when the switch is in the
slot 218, the main Geneva roller 210 enters the arcuate
fully closed position and followed by a description of
slot portion 222 of the main Geneva cam 225. Since this
what takes place when the intermediate insulator 18 is
portion of the slot 222 is concentric with the axis of rota
rotated to open the circuit. Then giving consideration to 50 tion of the main shaft 68, the main Geneva cam 225 re
the positions of the various parts of the mechanism when
mains stationary While the main Geneva roller 210 moves
the switch blades 35 and 3'7 are in the open position and
through the arcuate slot portion 222 and the second switch
the load current interrupter :80 likewise is in the open
blade 37 remains in the locked high pressure contact en~
position, outlining the sequence of operations for closing
gagement position ‘with the second line contact mem
the circuit and restoring the switch to the switch closed 55 ber 31.
position.
Meanwhile the trip latch 172 engages the arcuate trip
As shown in FIGURES 1 and 2. of the drawings, the
cam 169 on the operating spring socket 140 and it is held
?rst and second switch blades 35 and 37 are in high
thereby against movement under the in?uence of the
pressure contact engagement with the ?rst and second
springs 167 and 168. The interrupter trip actuator 182
line contact members 29 and 31, respectively. As shown 60 rotates conjointly with the main shaft 68 and the roller
in FIGURE 4 by full lines, the ?rst and second switch
192 carried by the arms 190 thereof moves away from the
cranks >66 and 67 occupy positions 9° past the respective
arm 196 thereby permitting the spring 202 to rotate the
lines through the longitudinal axes of the ?rst and second
interrupter closing lever 152 in a clockwise direction
switch blades 35 and 37 and the axes of rotation of the
away from the cross head 128 to the position shown in
65
main shaft 68 and the auxiliary shaft 69. For illustrative
FIGURE 8 of the drawings.
purposes in FIGURE 4 the ?rst and second switch blades
Referring to FIGURE 8 with continued rotation of
35 and 37 are shown by full lines in the unlocked posi
the main shaft 68 through an additional 18°, the ?rst
tions to which they are rotated after a rotation of the
switch blade 35 swings the arcing tip 39 thereon away
respective switch cranks 66 and 67 through 9° to the
aligned positions just described. As shown in FIGURES 70 from the arcing tips 33 which form a part of the ?rst line
contact member 29. The entire ?ow of current then is
5A—B—C the contact tips 101 of the interrupter units 81
transfer-red to the load current interrupter 180 in series
engage the respective contact ?ngers 90. Thus both
with the closed second switch blade 37. The auxiliary
switch blades 35 and 37 are closed and the load current
interrupter 80 is closed in parallel with the ?rst switch
Geneva roller 212 moves out of the slot 218 on the un
blade 35. The inner and outer coil springs 167 and 168 75 derside of the auxiliary Geneva cam arm 214 and the
3,070,674
13
14
main Geneva roller 210 enters the arcuate slot 222 as
The rotation of the main shaft 68 is continued through
the axis of the pivot 40 to a position at right angles to
the position which it occupies in the circuit closed posi
tion.
an additional l81/z° or a total of 58% ° from the initial
During this further rotation of the interrupter trip
previously described.
actuator 182, the roller 192 moves out of engagement
position. Here the ?rst switch blade 35 and its arcing
with the arm 196 and the spring 202 then urges the in
tip 39 have been moved to a position away from the
terrupter closing lever 152 to the position shown in FIG
?rst line contact member 29 and the arcing horns 33 far
URE 10 of the drawings where the roller 149 carried
enough to prevent any ?ashover therebetween should the
thereby engages an abutment 227 that extends inwardly
load current interrupter 80 be operated to the open cir
cuit position. As shown in FIGURE 9, the interrupter 10 from the mechanism housing 43.
FIGURE 10 of the drawings shows the arm 187 on
trip actuator 182 is rotated likewise and the trip edge 180
the interrupter trip actuator 182 rotated through the
of the depending ?ange portion 181 engages the shoulder
full extent of rotation of the main shaft 68 with the
179 on the trip ?nger 175 and causes it to rotate in ‘a clock
push bolt 188 engaging the shoulder 189‘ on the operat—
wise direction, carrying with it the trip latch 172. This
disengages the shoulder 171 on the trip latch 172 from 15 ing spring arm 139. There has been a corresponding
rotation of the pair of Geneva driver arms 207 and the
the shoulder 170 on the arcuate trip cam 169‘ of the
main Geneva roller 210 in the radial slot portion 226
operating spring socket 140. On release of the arcuate
rotates the main Geneva cam 225 through an additional
trip cam 169 the interrupter trip actuator 182 is released
72° for a total of 85° to effect a corresponding rotation
and it swings in a clockwise direction under the biasing
of the second switch crank 67 to the position shown by
action of the springs 167 and 168 to the position shown
the dot and dash lines in FIGURE 4. There is a cor
by full lines.
responding rotation of the second switch blade 37 to the
As illustrated in FIGURE 9 of the drawings the oper
open position which is at right angles to its closed po
ating spring arm 139 moves through an arc of 10° before
sition. When the switch construction shown in FIGURE
the fork extensions 1.38 engage the cross head 128. Dur
ing this movement the beveled surface 141, FIGURE 11, 25 1 is in the open position, the ?rst and second switch
blades 35 and 37 extend upwardly in parallel relation to
engages the beveled latch release surface 142 of the latch
each other from the mechanism housing 43. There is
143 and lifts it out of the path of the cross head 128.
then an air gap between the mechanism housing 43 and
Under the in?uence of the springs 167 and 168 the oper
the second line contact member 31 while a high resist
ating spring arm 139 swings to the position shown by the
broken lines in FIGURE 9 carrying with it the cross head 30 ance circuit exists between the ?rst line contact member
29 and the mechanism housing 43 through the voltage
distributing resistors 117. As the second switch blade
128 and interrupter contact operating tube 127 until the
cross head 128 engages the washers 156 of shock absorb
37 leaves the arcing horns 34, a very low current arc
ing material. The movement of the interrupter contact
is drawn in interrupting the current ?ow through the
operating tube 127 is accompanied by separation of the
contact tips 101 from the contact ?ngers 90 in each of 35 voltage distributing resistors 117.
The switch construction now is in the open position.
the interrupter units 81 with the result that the circuit is
As pointed out, the ?rst and second switch blades 35
interrupted simultaneously at four places and four arcs
and 37 are in upstanding parallel relation and at right
are drawn and extinguished. This leaves the voltage dis
angles to their closed circuit positions. The contact
tributing resistors 117 in series between the ?rst line con
tact member 29 and the mechanism housing 43 and in 40 tips 101 of the interrupter units 81 are out of engage
ment with the respective contact ?ngers 90. The volt
series with the second switch blade 37 which still is in the
age distributing resistors 117 are in series and individually
closed circuit position.
in parallel circuit relation with the respective open con
The rotation of the main shaft 68 is accompanied by a
tacts of the interrupter units 81. The springs 167 and
corresponding rotation of the Geneva driver arms 207.
168 are re-cocked and the trip latch 172 engages the
They rotate to the position shown in FIGURE 9 and
move the main Geneva roller 210 further into the slot
226. This causes the main Geneva cam 225 to rotate
through 12° to effect a corresponding rotation of the
second switch crank 67.. The ?rst 9° of this rotation
effects rotation of the second switch blade 37 about its
longitudinal axis to the position shown by full lines in
FIGURE 4 which is the unlocked position. Continued
rotation of the second switch blade 37 about its longi
tudinal axis causes it to rotate out of high pressure con
45
shoulder 170 of the trip cam 169.
It remains to de
scribe the sequence of operation for closing the switch
construction to reestablish the circuit.
The sequence of closing the switch construction is
?rst to close the second switch blade, thereby again plac
ing the voltage distributing resistors 117 in the circuit,
next completing the circuit by closing the ?rst switch
blade 35 and ?nally closing the contacts of the load
current interrupter 80 in parallel with the ?rst switch
blade 35. To eifect this operation the arm 28, FIG
tact engagement lwith the second line contact member 31. 55
URE 3, is ‘rotated to rotate the arm 20 and the inter
At the time that the contacts of the load current inter
mediate insulator 18 in a clockwise direction. This
rupter 80 are opened to interrupt the circuit the sequence
effects a corresponding rotation of the main shaft 68.
of operation is such that the second switch blade 37 still
The Geneva drive arms 20-7, FIGURE 10, rotate in a
is in high pressure contact engagement with the second
line contact member 31. It is only after the circuit has 60 clockwise direction to effect a rotation of the main
been interrupted by the load current interrupter 80 that
Geneva cam 225 in a counterclockwise direction.
the second switch blade 37 is moved out of high pressure
is accomplished through the movement of the main
Geneva roller 210 in the radial slot portion 226 to ro
tate the auxiliary shaft 69 and therewith the second switch
contact engagement with the second line contact mem
This
ber 31.
The rotation of the main shaft 68 continues through 65 crank 67. This causes the second switch blade 37 to
rotate about the pivot 57 from the vertical position
an additional 54% ° or through a total of 113° from the
toward the closed position. The rotation of the main
initial position. During this rotation the push bolt 188
shaft 68 is accompanied by rotation of the interrupter
engages the shoulder 189 on the operating spring arm
trip actuator 182 in a clockwise direction together with
139 and thereby rotates the interrupter trip actuator 182
the roller ‘192 which moves toward the arm 196 which
for the purpose of tensioning or re-cocking the springs
167 and 168. During the ?nal portion of the rotation
of the main shaft 68 through the 113°, the ?rst switch
crank 66 is similarly rotated to the position shown by
the dot and dash lines in FIGURE 4.
This is accom
is associated with the interrupter closing lever 152.
The ?rst switch crank 66 also rotates in a clockwise
direction together with the main shaft 68 to rotate the
?rst switch blade 35 from the open position toward the
panied by a swinging of the ?rst switch blade 35 about 75 closed position.
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