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Патент USA US2106114

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Jan. 18, 1938.
,
2,106,114
H.‘ J. CRABBS
CIRCUIT BREAKER
Filed Nov. 5, 1934
5 Sheets-Sheet l
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WTNESSES:
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ATTOR
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Jan. 18; 1938.
H_ J_ CRABBS
2,106,1 14
CIRCUIT BREAKER
Filed Nov. 3, 1934
3 Sheets-Sheet 2
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INVENTOR
ATTORN
Jan. 18, 1938.
|-|_ J_ CRABBS
2,106,114
CIRCUIT BREAKER
Filed Nov. 5, 1934
3 Sheets-Sheet 3
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WITNESSES:
‘
,
INVENTOR
BY
ATTORN Y
?
2,106,114
Patented Jan. 18, 1938
UNITED STATES PATENT OFFICE
2,106,114
cmcorr BREAKER
Herbert J. Crabbs, Wilkinsburg, Pa., assignor to
' Westinghouse Electric & Manufacturing Com
pany, East Pittsburgh, Pa., a corporation of
Pennsylvania
Application November 3, 1934, Serial No. 751,290
13 Claims. (Cl. 200—146)
My invention relates to circuit interrupters and
particularly to electrical switches of the type‘
which are used for isolating or sectionalizing por
tions of a transmission line or a power distribution
5
system.
‘
Switches of this type are generally known as
disconnecting switches and their primary func
tion is to provide a means whereby particular ap
paratus or sections of transmission. line may be
10 positively disconnected from all sources of power
in order that maintenance work may be done
thereon with absolute safety to the workmen.
For several reasons, the design of these switches
has always presented a rather complex problem
15 to the electrical art, and with the advent of the
long distance transmission line, the problem has
become considerably more complicated.
Usually the switches are mounted out of doors
provision of a switch which includes a blade and
contact structure and an auxiliary expulsion type
circuit interrupter, which is normally connected
in parallel with the blade structure, but which is
operable during the switch opening operation to
control and to extinguish the are formed inci
dent to the opening of the electrical circuit
through the switch. To reduce the cost of the
device to a minimum and to simplify its structure
as much as possible, I prefer to utilize a gravity 10
operated actuating mechanism for the expulsion
interrupter. Through this arrangement it be
comes possible to completely enclose all of the
moving parts of the expulsion type interrupter,
thus assuring its satisfactory operation under all 15
possible conditions.
As a further means for reducing the cost and
for assuring more reliable operation of my im
and in the ordinary course of their operation, 7 proved switch, I prefer to utilize a blade structure
for the main current carrying portion of the de 20
20 they are actuated but infrequently, both of which
conditions combine to provide an almost ideal vice which shall be provided with means for pro
ducing a high pressure wiping engagement be
condition for oxide corrosion formation. De
tween
the cooperative contact surfaces during the
spite this infrequency of operation of the switch
circuit closing operation. By doing this, a very
es, it is imperative they shall be absolutely re
liable when an operation is necessary. In the considerable reduction in the physical dimen 25
25
Northern States, this means that they must in
clude some arrangement for taking care of ice
and sleet formations.
In the older systems, the disconnecting switch
30 es were practically never called upon to open any
appreciable load currents. Under present day
conditions on long distance transmission lines,
however, the line charging current is often su?i
ciently high to make the opening of the circuit
impractical with a simple air break switch, and
35
some means must be provided for increasing the
arc interrupting capacity of the devices. One
method of accomplishing this has been pointed
out in my copending application Serial No. 739,
4O
891; and the principal object of the present in
vention is the improving of devices of that type.
The problem of providing a commercially sat
isfactory disconnecting switch which is capable
of interrupting arcs of considerable magnitude is
further complicated because of the fact that the
cost of the switches must be kept comparatively
low, due to the large numbers of these devices
which are used on even a small system.» Another
important object of my invention, therefore, is to
provide a high capacity disconnecting switch
which shall be capable of interrupting considera
ble amounts of power and which, at the same
time, shall be comparatively low in cost.
These objects are accomplished in the pre
55 ferred embodiment of my invention through the
sions of the arc extinguishing portion of the
switch is made possible with obvious resultant
economies, at the same time, the low resistance
of the blade structure which results from the high
pressure wiping engagement of the contacts, as 30
sures that the amount of current which flows
through the arc extinguishing device shall not
reach an excessively large value during the nor
mal operation of the switch. ~
A further object of‘ my invention is to provide 35
an improved means for effecting the successive
operation of two cooperating circuit interrupting
devices whichv may be, but are not necessarily
electrically connected in parallel.
An ancillary object of my invention is to pro
40
vide an improved gravity operated, expulsion, cir
cuit interrupting device which shall be suitable
for use with electrical apparatus generally.
These and other objects of my invention will be
made more apparent in the following drawings
and description of an electrical switch wherein
are embodied the principal features of my inven
tion. Referring to the drawings,
45'
Figure 1 is an elevational view of a vertical
break disconnecting switch which has been pro 50
vided with an auxiliary expulsion circuit inter
rupting device according to my invention,
Fig. 2 is a plan view of the switch illustrated
in Fig. 1.
-
Fig. 3 is a fragmentary elevational view show— 55
2
2,100,114
ing one of the moving parts of the switch illus
trated in Figs. 1 and 2 at one of the intermediate
positions in the circuit opening operation.
Fig. 4 is a view similar to Fig. 3, showing the
moving portions of the switch in the open circuit
position.
,
Fig. 5 is a sectional view through the expul
sion circuit interrupting device which is em
bodied in the switch shown in Figs. 1 through 4.
10
Fig. 6 is an enlarged sectional view taken on
the line VI—V'I of Fig. 5.
'
Fig. 7 is an enlarged sectional view taken on
the line VII-VII of Fig. 5, and
Fig. 8 is an enlarged fragmentary view, par
15 tially in section, of the contact structure disposed
at the outer end of the arc extinguishing device
shown in the other ?gures of the drawings.
.As shown particularly in Figs. 1 through 4,
the preferred embodiment of my switch includes
-20 a base I, which may be formed of channel iron,
two stationary insulators 3 and 5 a?‘lxed thereto
by suitable bolts 1, and a rotatable insulator 9
which is rotatably supported on the base through
a bearing means “I. Each of the insulators is
25 of the conventional high voltage type and, in
addition to a base II and a ceramic central por
tion l3, includes a metallic cap l5. A blade as
semblage I1 is supported upon the cap portion
of the central insulator 5 for swingable motion
30 from one position to the other through the
agency of‘ a U-shaped support 19 and a pin 2|
and is adapted to engage a suitable contact jaw
23 supported on the cap portion of the outer
stationary insulator 3.
An expulsion circuit interrupting device 25 of
considerably greater arc extinguishing capacity
than the movable blade assemblage I1 is pivot
ally supported upon a suitable bracket mem
ber 21 which projects upwardly from the
40 U-shaped blade support means l9 a?lxed to
the central insulator. This device is normal
ly electrically in parallel with the blade as
semblage I‘! when the interrupter is in the closed
circuit position, and is adapted to be moved to
the open circuit position during each circuit in
terrupting operation only after the blade assem
blage I‘! has been swung out of engagement with
the cooperating contact means 29 supported on
the outer insulator 5. By this arrangement, the
V50 electrical circuit through the switch is always
broken by the device having the greatest arc
interrupting capacity, that is, the expulsion type
circuit interrupting means 25.
‘The blade assemblage I1 comprises two tubu
lar blade members 29 and 3| which are joined
together at their outer end by a linkage, consist
ing of a pair of parallel link members 99 a?ixed
to the blade members through the agency of suit
able pins 35. At their inner end, the blade mem
60 bers are joined together by a second linkage
comprising a second pair of parallel link mem
bers 31. The lower end of each of the link mem
bers 31 and the left hand end of the lower blade
member are engaged by the pivot pin 2| which
65 extends through the opposed sides of the U—
shaped support IQ for the blade assemblage. The
upper end of each of the two links 31 engages the
left hand end of the upper blade member 9|
through a pin 39.
Each of the blade members is provided with a
suitable contact portion 4| at its outer end. The
portion 4| Laiilxed to~ the lower blade member 29
is provided with a toothed section 49 (Fig. 2)
which is adapted to cooperate with a similar
toothed section 45 formed in one 01' the side por
tions ll of the jaw member 23, in order to per
mit the mechanical interconnecting of the two
stationary insulators during the circuit closing
operation, and the other portion 4| is provided
with a smooth contact surface 49 for engaging
the cooperating suriace 5| of the other side por
tion 41 of the jaw with a wiping connection.
During the normal operation of the switch, the
entire blade assemblage I1 is swung from the
open circuit position to a position where the con 10
tact portions ll of the two blade members are
in proximity with the cooperating contact jaw
29. Then, the blade assemblage is held substan
tially stationary while the upper blade 2| is
moved longitudinally relative to the lower blade 15
29. This movement causes the linkage connect
ing the outer end of the two blade members to
be moved in such manner that the contact por
tions ll of the two blades are moved laterally
away from each other. As a result the cooperat 20
ing contact portions 49 and 5| of the upper blade
9| and one side of the jaws are caused to engage
each other with a high pressure wiping action,
and simultaneously with the wiping action of
these contact portions, the toothed contact por
tions 43 and 45 of the lower blade 29 and the
other side of the jaw are pushed into intimate
engagement with one another thereby serving
to mechanically interconnect the two stationary
insulators 9 and 5. Through this arrangement, 30
the cantilever stresses which are induced in those
insulators during the normal operation of the
switch are minimized.
In order that the circuit closing operation shall
take place in two steps, a pair of angularly 01‘! 35
set crank members 53 and 55 are provided for
actuating the blade assemblage l1. These oif
set cranks are cast integral with one another
into a single member 51 which is adapted to be
rigidly a?ixed to the cap portion I5 01 the rotat 40
able insulator by suitable screws 59, and the
cranks are operatlvely connected to the blade
assemblage by means of a pair of tie-links 5|
and 53.
i
To accommodate the relative movement of
the blade members and the associated actuating
crank during the operation of the switch, each
end of each of the cranks ii and 69 is provided
with a universal joint means 55 for mechanically
connecting each of the links with its actuating
crank and with the blade assemblage. The right
hand end of the lower link it engages an up
standing member 51 which is cast integral with
the end portion 55 of the lower blade member ‘
29, this upstanding portion acting substantially 55
as a bell crank lever in order to permit the
blade assemblage I‘! to be swung from one posi
tion to the other during the actuation of the
switch. A tie-member 59 extends from the up
standing support 21 for the expulsion circuit in 60
terrupting device 25 to a point on the member
51 which coincides with the axis of rotation of
the rotatable insulator and is held in that posi
tion by a suitable cap screw 1|. _'I'his tie 59
serves to give increased rigidity to the support
means for the-expulsion circuit interrupting de
vice.
‘
A plate member ‘I3 is bolted to the cap por
tion of the central insulator and extends from
that insulator to the rotatable insulator 9. A 70
circular openingfii is cut in the plate 19 for
permitting the passage therethrough of the cy
lindrical base portion 15 of the crank casting 51.
The opening and the base portion have cooper
ating bearing surfaces, and by this arrangement
2,106,114
the engagement of the plate member 13 is caused
to constitute a means for mechanically intercon
necting the rotatable and the central insulators
thereby reducing the stresses-induced in those
insulators during the operation of the switch
under adverse conditions.
One of the switch
terminals 14 is supported upon this plate mem
her and the other terminal is supported upon a
suitable projection 11 which extends outwardly
from the jaw member v23.
~
The expulsion type circuit breaker 25, as is
shown particularly in Figs. 5 through 8, includes
a pair of interconnected tubular members 18 and
8| which de?ne the outer walls of an arc pas
15 sage 83 and a second passage 85 connecting
therewith. A contact means 86 is mounted at
the outer end of the tubular member ‘I8 which
de?nes the walls of the arc passage 83, and a rod
shaped contact member 81 is provided for coop
20 erating therewith, this rod member being adapted
to move through the arc passage toward the
contact means 85 during the circuit closing op
eration and to move through the arc passage
away from the contact means dining the circuit
25 opening operation.
A weight means 88 is pro
vided for actuating the rod contact 86. This
weight is normallydisposed within the larger
passage 85, and the walls of that passage serve
as a guide therefor.
30
The inner surface of the walls of the arc pas
sage 83 are preferably formed of hard ?bre or
some other material which is capable of evolving
arc extinguishing gas when placed in proximity
to an electrical arc, and the diameter of the pas
sage is preferably not substantially greater than
the diameter of the conducting rod 81 which
moves therein during the operation of the inter
rupter. In order to assure that the electrical
resistance through the expulsion type circuit in
40 terrupting device shall be maintained at a rea
sonably low value, the contact means 88 for en
gaging the rod at the outer end of the expulsion
tube includes a plurality of ?ngers 8| which are
biased toward each other by a pair of springs
45 83, as shown particularly in Figs. 7 and 8. These
?ngers 8| are retained in the position shown by
an annular conducting member 85 which is
threaded into the outer end of the main ?ber
tube. The central opening 81 within the con
50 ducting member 85 is of substantially the same
cross sectional area as the arc passage itself 83,
and it is ?ared at its outer end in order to facili
tate the ?ow therethrough of the arc extinguish
ing gases. A hinged cap member 88 of insulat
3
length as the tubular means 18 which de?nes the
walls of the arc passage 83 and is closed at its
outer end by a suitable cap member I85 which
is threaded thereon. A spring I81 is a?ixed to
this cap member at its inner side for reducing
the shock force of the weight 88 during the cir
cuit opening operation. The weight means itself
includes a cylindrical member of heavy metallic
material of slightly less diameter than the guide
tube therefor. Openings I88 are cut in this mem
10
ber for retaining ball bearings III therein in
order to minimize the friction between the guide
and the weight, and the central portion of the
weight is provided with a threaded opening “3
for mechanically engaging one end of the rod 15
member 81.
A pair of arms “5 and “1 are supported upon
the guide tube 8|, and each of these arms is pro
vided with an outwardly projecting pin I I8 which
is adapted to be engaged by the blade assemblage
I1, during the operation of the switch, in order
that the guide tube may be so moved that the
weight 88 will cause the conducting rod to be
moved from one position to the other. The en
tire expulsion circuit interrupting device engages 25
the support therefor (the tie members 21 and
88) through suitable pivot pins H8. '
The switch is shown in the closed circuit posi
tion in Fig. 1. To open the electrical circuit
therethrough, the rotatable insulator 8 is turned 30
in a clockwise direction (Fig. 2). The initial
portion of this movement moves the center of
the toggle linkage which is formed by the upper
crank member 55 and the upper tie member 83
away from the center line of the switch and in 35
so doing causes the upper blade member 3| to be
moved longitudinally with respect to the lower
blade member. This movement causes the blade
members to move laterally toward each other and
thereby effects a disengagement of the cooperat
ing contact surfaces 43 and 48 of the blade as
semblage and the contact jaw surfaces 45 and
5|. Upon further rotary movement of the actu
ating insulator 8, the center point of the toggle
linkage formed by the lower crank member 53 45
and the lower tie member 6| is moved over they
center line of the switch, and any additional
movement beyond this point position causes the
entire blade assemblage to be swung from the
position shown in Fig. 1 toward the position 50
shown in Fig. 3.
Due to the fact that when the switch is closed
the center of gravity of the gravity actuating
means for the expulsion circuit interrupter 25
ing material is pivotally supported adjacent the ‘biases the conducting rod 81 toward the cooperat 55
outer end of the arc passage, and is biased to a ing contact means 88 disposed adjacent the outer
position where it closes the outer end of the tube
18 by a suitable spring I83. The strength of this
spring is such that the out-?owing gases from
60 the arc passage 83 during the circuit interrupting
operation may readily vent to the atmosphere.
The tubular member 18 which de?nes the walls
of the arc passage 83 is mechanically connected
to the guide tube 8| by a suitable metallic con
necting member I84, the several members being
provided with cooperating threaded portions. To
assure good electrical contact between the guide
tube 8|, which serves as one of the terminals
of the expulsion device, four equally spaced con
tact
?ngers I88 are pivotally supported upon the
70
connecting member I88 in such manner that
they slidably engage the contact rod 81, a spring
I88 similar to the springs 83 biases these ?ngers
toward the contact rod.
75
I
The guide tube 8| is of approximately the same
end of the arc passage, the expulsion circuit inter
rupter is not moved toward the open circuit posi
tion during the switch opening operation until the
upper blade member 3| engages the pin I I8 pro 60
jecting outwardly from the upper bracket member
I I5. As soon as this engagement occurs, however,
the expulsion .circuit interrupter is caused to fol
low the blade assemblage toward the open cir
cuit position, and when the center of gravity of 65
that device has been shifted a sufficient amount,
the weight 88 automatically begins to move the
contact rod 81 toward the normal circuit posi
tion.
Once movement of the contact rod 81 is initiat 76
ed, it progressively accelerates itself and the en
tire expulsion device swings from the position
shown in Fig. 3 to the full open position shown in
Fig. 4. The arcing horns |2I and I23 remain in
engagement during a short portion of the circuit I v
4
2,100,114
opening operation, but as soon as they are dis
engaged, the arc incident to the opening of-the
circuit controlled by the switch is drawn there
between. At the same time, an arc is being
drawn within arc passage 83 formed in the tube
19. This second arc contacts the walls of the arc
passage and causes the evolution of- a quantity arc
extinguishing gas therefrom. In venting, this~gas
?ows outwardly with an expulsive action, and in a
10 very short period of time effects the extinguish
ment of the are which is drawn within the arc
passage. When in the open circuit position, the
various elements of the switch are disposed as is
shown in Fig. 4.
15
-
By causing the opening operation of the ex
pulsion type circuit interrupter 25 to be brought
about only after the blade assemblage I‘! has dis
engaged the cooperating contact jaw 23 therefor,
the interruption of the circuit controlled by the
20 switch is always brought about by that device
which is best capable of extinguishing heavy cur
rent magnitude arcs.
The closingoperation is substantially the re
verse of the opening operation. The rotatable
25 insulator 9 is rotated counterclockwise from the
position shown in Fig. 4 thereby swingably moving
the blade assemblage I‘! in the direction of the
contact jaw. As the blade assemblage nears the
full on position, the lower blade member 29 en
30 gages the pin H8 which projects outwardly from
the lower bracket arm H1 and moves the expul~
sion device 25 along with it toward the closed cir
cuit position. The actuating linkages are so cor
related that when the lower toggle linkage ap
35 proaches the dead center position, the outer end
of the blade assemblage is substantially in the
normal closed circuit position. At this time, how
ever, the upper linkage is a considerable distance
(annular measurement) from the center line of
40 the switch and during the final portion of the
circuit closing operation it effects a longitudinal
movement of the upper blade member 3i there
by producing a high pressure engagement of the
cooperating contact surfaces.
Since the blade members engage the jaw means
45
with a high pressure wiping engagement, any
oxide or corrosion which might be formed between
the cooperating contact surfaces are effectively
cut through and a good electrical connection is as
sured between the blade and the contact jaw. By
virtue of this, it is possible to reduce the normal
current carrying capacity of the expulsion device
25 to a very small value, the normal distribution of
current between the two parallel paths of the
55 switch assuring that an excessive amount of cur
rent will not flow through the expulsion device
when the switch is in the closed circuit position.
Through the provision of a slidable weight for
a?ectlng the actuations of the contact means of
60 the expulsion circuit interrupter, the device is
made completely enclosable, thereby assuring that
water or ice will not interfere with its operation
under adverse weather conditions. This is an
important feature in adding to the reliability of
65 operation of the switch, particularly since the
blade assemblage is capable of operating even
when heavily ice coated-the mechanism being so
arranged that any ice which may be formed
thereon is subjected to a tensional or a torsional
70 stress during the normal operation of the switch.
From the foregoing, it will be seen that I have
disclosed an improved disconnecting switch which
is particularly suitable for use in applications
where considerable amounts of power must be
75 interrupted.
In the preferred form, my im
proved switch includes a high current capacity
but low arc extinction capacity circuit inter
rupting device and a high arc interrupting ca
pacity device which is of low current carrying
capacity, the two structures being electrically con
nected in parallel and being so arranged that the
high current carrying capacity switch carries sub
stantially all of the normal line current but is
never called upon to open the circuit through the
switch. In addition to this improved arrange 10
ment, I have disclosed the features of a gravity
actuated expulsion type circuit interrupter which
is so arranged that all of the moving parts are
completely enclosed at all times.
In addition to the above, I have disclosed a 15
novel arrangement for applying my improved ex
pulsion type circuit interrupter to disconnecting
switches generally, and have shown how the
normal movement of the blade can be utilized for
effecting the actuation of the contact means of 20
the expulsion interrupter.
While in the foregoing, I have described the
features of a device wherein the auxiliary cir
cuit interrupting device provides a metallic con
ducting circuit electrically in parallel with the
high current capacity interrupter, formed by the
blade assemblage and the cooperating contact
means therefor, it is to be understood that this ar
rangement is but one of those which may be used.
The objects of the invention may quite as readily 30
be accomplished by the provision of a structure
which includes means for assuring that any are
which may be established during the circuit open
ing operation shall be caused, eventually, to exist
between one of the terminals of the auxiliary cir 35
cuit interrupting device and one of the main
switch terminals. Any arrangement meeting this
requirement effects the desired sequence of op
eration and assures that all arcs shall be ex
tinguished by that portion of the device which is 40
best fitted for accomplishing that extinction.
As an illustration the above requirement may
be ful?lled through the provision of a structure
.wherein the auxiliary circuit interrupting device,
when in the closed circuit position, has a terminal
disposed in close proximity to, but not actually
contacting, the contact means which cooperates
with the movable blade portion of the high cur
rent capacity interrupter. During the initial
portion of the circuit opening operation of such a ,
structure, the blade ‘means for the main current
carrying means is moved, toward the open circuit
position, thereby drawing‘an arc between one end
of the blade and its cooperating contact. The
air gap (which is a measure of the arc length) 55
produced by this circuit opening movement of
the blade means will soon become suiiiciently
large to create an impedance path for the are
which is of greater magnitude than the path
through the auxiliary interrupter, and as a re 60
sult a break down between the contact means for
the blade assemblage and the adjacent portion
of the auxiliary circuit interrupting device will
take place, the initially formed are between the
blade and its cooperating contact means being 65
thereby extinguished. By properly proportioning
the air gap in the circuit through the auxiliary
interrupter the transfer of the are from the main
current-carrying path to the auxiliary current
carrying path may be caused to take place at any
desired point in the circuit opening operation.
By providing an arcing horn as has been done
in the above described preferred embodiment of
my invention, arcing between the main blade as
semblage and its cooperating contact means is 75
5
2,106,114
prevented at all times. The objects of the inven
tion may, however, as pointed out in the fore;
going, be accomplished in a device wherein the
outer terminal of the auxiliary contact means
does not actually contact the cooperating con
tact for the main bridging means, and it is my
desire that the accompanying claims shall cover
such a device, the language “a conducting path in
parallel with the main current carrying path” be
10 ing intended to cover a device wherein the aux
iliary current carrying path may have an air gap
therein, the are initially drawn by the blade as
semblage breaking down across this air gap so as
to cause all of the current ?owing through the
15 device to flow through the auxiliary circuit inter
rupter during the progress of the circuit opening
operation.
While in accordance with the patent statutes,
I have disclosed the foregoing details of a pre
20 ferred embodiment of ‘my' invention; it is to be
understood that many of these details are merely
illustrative and that variations in their precise
form will be both necessary and desirable in cer
tain instances; I desire, therefore, that the lan
25. guage of the accompanying claims shall be ac
automatically actuable in response to movement
of said closure to a given predetermined po
sition to effect the separation of said relatively
movable contact members and automatically
actuable in response to movement of the closure
to another predetermined position to effect en
gagement of said relatively movable contact, said
blade during its opening movement being adapted
to actuate said are extinguishing means a sub
stantial distance from, at least one of said spaced 10
conducting members to thereby provide an air
gap in said conducting path capable of with
standing high voltage.
3. In an electric switch, a stationary contact,
a blade member movable into and out of engage
ment with said stationary contact, means for
actuating said blade member, an arc extinguish
ing device movable into and out of engagement
with said stationary contact, said are extinguish
ing device comprising a terminal adapted to re 20
leasably engage said stationary contact, a pair
of separable contacts and means automatically op
erative in response to movement of said are ex
tinguishing device to- a predetermined position
for actuating said separable contacts to open po 25
corded the broadest reasonable construction, and sition, and means carried by said are extinguish
that my invention shall be limited only by what is
expressly stated therein and by the prior art.
I claim as my invention:
30
.
1. In an electrical switch, a pair of spaced in
sulator columns, conducting means mounted on
each of the columns, a swingably supported blade
for bridging the conducting means to provide an
electrical circuit therebetween, an arc extinguish
35. ing device mounted in proximity to the blade,
means operable to actuate the blade into and-out
of engagement with at least one of the conduct
ing means, said are extinguishing device includ
ing relatively movable conducting members for
providing a conducting path in parallel with the
current carrying path provided by the blade when
the switch is in closed circuit position, and means
carried by said are extinguishing device adapted
to be engaged by said blade upon movement of
the latter out of engagement with the said one
contact for separating said relatively movable
conducting members to establish an arc there
between, said means carried by said are extin
guishing device being operative upon further
movement of said blade toward the full open po
sition to separate the arc extinguishing device a
substantial distance from at least one of said
conducting means to thereby provide an air gap
su?icient to withstand high voltage.
2. In an electrical switch, a pair of spaced con
ducting members, a blade adapted to bridge the
conducting members when the switch is in closed
circuit position, a rotatable insulator, means op
erable in response to rotation of the insulator to
actuate the blade into and out of engagement
with at least one of the conducting means, and
means mounted in proximity to the blade for
extinguishing the are which is formed incident
to the opening of the circuit controlled by the
switch, the arc extinguishing means including a
closure, relatively movable contact members
within said closure for providing a conducting
path'in parallel with the current carrying path
.10
provided by the blade at least during each open
ing movement of the switch, means carried by
the arc extinguishing means disposed to be en
gaged by the blade when it is actuated, to e?ect
a movement of the closure, the means carried by
the arc extinguishing means and the blade being
arranged to provide a lost motion, and means
ing device disposed to engage said blade mem
ber following the latter’s disengagement from
said stationary contact for, actuating said are
extinguishing device to said predetermined posi
30
tion and for further actuating said arc extin
guishing device to a position disconnected from
said stationary contact to thereby provide an air
gap between said stationary contact and said are
extinguishing device capable of withstanding high 35
voltage.
I
4. In an electric switch,.a stationary contact,
a blade member movable into and out of engage
ment with said stationary contact, means for
actuating said blade member, an arc extinguish 40
ing device movable into and out of engagement
with said stationary contact, said are extinguish
ing device comprising a terminal adapted to re
leasably engage said stationary contact, a pair of
separable contacts and means automatically op 45
erative in response to movement of said are ex—
tinguishing device to a predetermined position for
actuating said separable contacts to open posi
tion, and means carried by said are extinguishing
device disposed to engage said blade member fol 50
lowing the latter’s disengagement from said sta
tionary contact for actuating said are extinguish
ing device to said predetermined position and for
further actuating said are extinguishing device
to separate said terminal a substantial distance
from said stationary contact to provide an air
gap su?icient to withstand high voltage, said
automatically operative means for actuating said
separable contacts being disposed to bias said
terminal into engagement with said stationary 60
contact when said blade member is in the closed
position.
5. In an electric switch, a stationary contact,
a blade means swingable into and out of engage
ment with said stationary contact to open and to 65
close the electrical circuit through said switch,
actuating means for said blade means, and means
of greater arc extinguishing capacity than said
blade means for extinguishing the are which is
formed incident to each opening operation of 70
said switch, said are extinguishing means being
mounted in proximity to said blade means and
comprising a tubular member swingable into and
out of engagement with said stationary contact,
relatively movable contact means which provides
6
2,106,114
a conducting path in parallel with 'said blade
means at least during each opening operation of
said switch, a slidably supported weight which
normally biases said tubular means into engage
ment with said stationary contact, and means car
ried by said are extinguishing means disposed to
be engaged by said blade means during each open
ing operation of said switch to cause said tubular
means to be moved out of engagement with said
10 stationary contact and to cause said slidable
weight to move to a position where it biases said
tubular means away from said stationary contact,
said means carried by said are extinguishing
means and said blade means being arranged to
15 provide for a lost motion, said slidable weight
when moving to said last mentioned position ef
fecting the separation of said relatively movable
contact means.
6. In an electric switch, a stationary contact,
20 a blade means swingable into and out of engage
ment with said stationary contact to open and
to close the electrical circuit through said switch,
actuating means for said blade means, and means
of greater are extinguishing capacity than said
25 blade means for extinguishing the arc which is
formed incident to each opening operation of said
switch, said arc extinguishing means being
mounted in proximity to said blade means and
comprising a tubular closure having at least one
30 terminal positioned adjacent one end thereof,
said closure being supported for swingable move
ment to an open and to a closed circuit position
in which latter position said terminal member
engages said stationary contact, relatively mov
able contact means which provides a conducting
path in parallel with said blade means at least
during each opening operation of said switch,
means automatically actuable to move said rela
tively movable contact members into or out of
40 engagement with one another when said tubular
member is moved from one'of said positions to
the other, and means carried by said arc ex
bular closure out of engagement with said sta_—
tionary contact takes place at a time subsequent
to the disengagement of said stationary contact
by said blade means.
8. In an electric switch, a stationary contact,
a blade means swingable into and out of engage
ment with said stationary contact to open and to
close the electrical circuit through said switch, ac
tuating means for said blade means, and means of
greater are extinguishing capacity than said blade 10
means for extinguishing the arc which is formed
incident to each opening operation oi said switch,
said are extinguishing means being mounted in
proximity to said blade means and comprising
a tubular closure supported for swingable move
ment to an open and to a closed position, a ter
minal which is supported on said closure, said
terminal being moved into engagement with said
stationary contact when said closure is moved
to the closed circuit position and being moved out
of engagement with said stationary contact when
said closure is moved to the open circuit position
in order to assure the existence of an air gap in
the electrical circuit of said switch when said
switch is in the open circuit position, relatively 25
movable contact means which provides a conduct
ing path in parallel with said blade means at
least during each opening operation of said
switch, means automatically actuable to move
said relatively movable contacts out of engage
ment with one another when said closure is moved
from the closed circuit position to the open circuit
position and to effect the reengagement or said
contacts when said closure is moved from the
open circuit position to the closed circuit position,
and means carried by said tubular closure and
projecting into the path of movement oi.’ said
blade means and adapted to be directly engaged
by said blade means during each opening opera
tion of said switch to cause said tubular closure to
be moved from the closed circuit position to the
open circuit position in response to movement of
tinguishing means disposed to be engaged by
said blade means, said last-mentioned means in
said blade means when it is actuated, to e?ect a
cluding means whereby the movement 01’ said
closure to the open circuit position is caused to 45
take place only after said blade means has dis
45 switching operation, said means carried by said
are extinguishing means and said blade means
being arranged to provide for a lost motion.
'7. In an electric switch, a stationary contact,
a blade means movable into and out of engage
50 ment with said stationary contact to open and
to close the electrical circuit through said switch,
actuating means for said blade means, and means
of greater arc extinguishing capacity than said
blade means for extinguishing the are which is
55 formed incident to each opening operation of said
switch, said arc extinguishing means being
mounted in proximity to said blade means and
comprising a tubular closure which is supported
so as to be movable into and out of engagement
with said stationary contact, relatively movable
contact means which provides a conducting path
in parallel with said blade means at least during
engaged said stationary contact.
9. In an electric switch, a pair of spaced con
tacts, a blade means of high current carrying
capacity but low arc extinguishing capacity
adapted to bridge said spaced contacts when said
switch is in the closed circuit position, means for
suporting said blade means for movement into
and out of engagement with at least one of said
spaced contacts to open and to close the elec 55
‘trical circuit through said switch, and means
of greater arc extinguishing capacity than said
blade means for extinguishing the are which is
formed incident 01' each opening operation of said
switch, said are extinguishing means being
mounted in proximity to said blade means and
comprising a tubular closure which is supported
each opening operation of said switch, means for movement to an open and to a closed circuit
automatically actuable when said tubular closure , position, a terminal positioned adjacent one end
is moved out of engagement with said stationary of said closure, said terminal engaging said sta~
contact to effect the separation of said relatively tionary contact when said tubular means is in
movable contacts, and means carried by said tu
the-closed circuit position and being moved out
bular closure and projecting into the path of of engagement with said stationary contact when
movement of said blade means and adapted to be
70 engaged by said blade means during each opening
operation of said interrupter to cause said tubu
lar closure to be moved out of engagement with
said stationary contact in response to movement
of said blade means, said last-mentioned means
being so arranged that the movement of said tu
said tubular means is moved to the open circuit
position, relatively movable contact means which 70
provides a conducting path in parallel with said
blade means at least during each opening oper
ation of said switch, means automatically actu
able to move said relatively movable contacts into
engagement with each other when said tubular 75
7
2,100,114
closure is moved from said open circuit to said
closed circuit position and to move said rela
tively movable contacts out of engagement with
each other when said tubular closure is moved
from said closed circuit to said open circuit po
sition, and means carried by said tubular clo
sure and projecting into the path of movement
of said blade means and adapted to be directly
engaged by said blade means during each oper~
ation of said
closure shall
closed circuit
ment of said
switch in order that said tubular
be moved to the open and to the
position in response to the move~
blade means into and out of en
gagement with said stationary contact.
10. In an electric switch, a pair of spaced con
ducting members, a swingably supported bridg
ing means movable into and out of engagement
with at least one of said conducting members
to open and to close the electrical circuit through
said switch, and actuating means for swinging
said bridging‘ means to the open and to the
closed circuit position, said swingable bridging
means comprising relatively movable contacts, a
tubular means for de?ning an arc passage where
in at least one of said contact means is adapted
to move, at least a portion of said tubular means
being lined with a material that is capable of
evolving an arc extinguishing gas when placed
in proximity to an electric arc, means automat
ically actuable to e?ect the separation of said
relatively movable contacts only after said tu
bular means has swung a predetermined distance
from the closed circuit position toward the open
circuit position and which is automatically actu
35 able to effect the reengagement of said relatively
movable contacts when said tubular means is
swung a predetermined distance from said open
circuit position toward said closed circuit posi
tion, said automatically actuable means being
40 mechanically connected to said movable contact
member within said bridging means.
11. In an electric switch, a pair of spaced con
ducting members, a swingably supported bridg
ing means movable into and out of engagement
45 with at least one of said conducting members
to open and to close the electrical circuit through
said switch, and actuating means for swinging
said bridging means to the open and to the closed
circuit position, said swingable bridging means
comprising a pair of connecting tubular closures
60 one of which de?nes an arc passage and the other
of which de?nes a guide passage, relatively mov
able contact means at least one of which is mov
able through said arc passage during the oper
ation of said switch, and means automatically
actuable to move said relatively movable contacts
into engagement with each other when said
bridging means is swung from the open circuit
to the closed circuit position and out of engage
ment with each other when said bridging means
is swung from the closed circuit to the open cir
cuit position, said contact actuating means in
cluding a weight supported for slidable move
ment in said guide passage, said weight being so
arranged with respect to the support point for
said swingable bridging means that it serves to
bias that device toward the open circuit position
when said switch is in that position and to bias
said bridging means toward the closed circuit
position when said switch is in that position, said
automatically actuable means being carried in
said guide passage and being mechanically con
nected to said contact member movable through 10
said are passage.
12. The combination with an air break switch
having _a stationary contact, a blade mounted
for swinging movement into and out of engage
ment with said contact, and means for actuat
ing said blade of an arc extinguishing device
comprising a tubular member having a terminal
at one end thereof, said tubular member being
mounted for swinging movement about a ?xed
pivot for moving said terminal into and out of
engagement with said stationary contact, a pair
of separable contacts within said tubular mem
ber, means operative in response to the movement
of said tubular member to a predetermined po
sition for actuating said separable contacts to
the open position, and a lost motion coupling
between said tubular member and said blade
member for swinging said tubular member to
open position in accordance with movement of
said blade member, said lost motion coupling
delaying movement of said tubular member until
said blade member has disengaged from said
stationary contact, said terminal member main
taining engagement with said stationary con
15
20
25
30
tact until said separable contacts have separated. 35
13. The combination with an air break switch
having a pair of spaced insulators, a ?xed con
tact on one of said insulators, a blade pivotally
mounted on the second insulator and means for
swinging said blade into and out of engagement 40
with said ?xed contact of conducting means nor
mally in parallel circuit relation with said blade,
said conducting means comprising a support
member pivotally mounted on said second insu
lat-or adjacent said blade for swinging movement 45
into and out of engagement with said ?xed con
tact, separable contacts carried by said support
member, means responsive to the movement of
said support member to a predetermined posi
tion for separating said separable contacts, means 50
responsive to and following a predetermined
movement of said blade in the circuit opening
direction for moving said support member out
of engagement with said ?xed contact and for
separating said contact and- said support mem 55
her a substantial distance to provide an air gap
su?icient to withstand a high voltage, said sup
port member maintaining electrical engagement
with said ?xed contact until said support mem
ber' has moved a distance suf?cient to cause said 60
separable contacts to open.
HERBERT J. CRABBS.
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