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Патент USA US2406321

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A1_18- 27, 1946-,
w. H. CUTTlNO
‘-
_ 2,406,321
SWITCHING DEVICE
‘Filed March 29, 1943
» mw/mm
(
21;. 4.
wnuzsses: '77 77
44m; 040/ 32
74
I
INVENTOR
56 MV/famb.’ [aft/270.
Patented Aug. 27, 1946
.
2,406,321
UNITED STATES PATENT OFFICE
2,406,321
SWITCHING DEVICE
William H. Cuttino, Wilkinsburg, Pa., assignor to
‘Westinghouse Electric Corporation, East Pitts
burgh, Pa., a corporation of Pennsylvania
Application March 29, 1943, Serial No. 480,945
9 Claims. (Cl. 200—5)
1
2
This invention relates generally to electric
switching devices, and more particularly to such
Fig. 3 is an enlarged plan view of the switch
shown in Fig. 2,
Fig. 4 is a side view of the switch shown in
devices per se and to a particular cooperative
assembly of ground and line switch devices.
One speci?c application ‘which this invention
is concerned with is in the grounding of capaci
tor units incident to switching operations. When
performing switching operations to a line-con
Fig. 3, and
Fig. 5 is an enlarged cross sectional View taken
substantially on the line V—V of Fig. 4.
The particular assembly of a ground and line
switch constituting this invention, is especially
constructed for use in applications where it is
nected capacitor, it is essential that a circuit to
ground be established before a switching opera 10 required that the ground switch be closed prior
to opening of the line switch. One application
tion is undertaken to avoid excessive arcing and
for a switching arrangement of this type is shown
consequent danger of flashover and injury to the
in Fig. 1, wherein capacitor units 2 are connect
operator and adjacent structures.
ed to a supply conductor 4 at one end, and may
Accordingly‘, one object of this invention is
to provide a novel arrangement of ground and 15 be connected at the other end by a line switch 5
to a similar arrangement of capacitors; for ex“
line switches to insure closing of the ground
ample, in a zero sequence capacitor potential de*
switch prior to opening or" the line switch.
vice arrangement. However, in opening line
Another object of this invention is to provide
novel actuating means for a line switch com
prising a ground switch having a movable con
tact which is operable to engage the movable con
tact of the line switch to actuate the latter.
Another object of this invention is to provide
a novel arrangement of a plurality of switches
such that the movable contact of one switch is
movable into and out of the electrical circuit of
another switch and is capable of actuating such
other switch.
Another object of this invention is to provide
a switch having a novel contact construction de
switch 6 for testing purposes or to isolate the
20 circuit controlled thereby, it is necessary that
the capacitors be grounded before switch 6 is
opened. A grounding switch 8 is, therefore, pro
vided for connecting the capacitors to a suit
able ground IB. While separate line and ground
ing switches may be provided with some sort of
interlocking means to require closing the ground
ing switch 8 before opening of the line switch
6, such a structure would be relatively complex,
and this invention is speci?cally directed to a
novel combination of a grounding switch and
line switch arranged to cooperate in a novel
manner to obtain the results desired without the
use of any such interlocking means, but prefer‘
ably arranged so that one switch is arranged to
a switch having a novel limited area contact
35 actuate the other in a predetermined sequence.
construction.
In the speci?c embodiment illustrated in Figs.
Another object of this invention is to provide
2
to
5, there is disclosed a capacitor supporting
a novel disconnect type of switch which is sim
signed to hold the switch in closed circuit posi
tion.
Another object of this invention is to provide
housing !2 adapted to have a hollow insulator lfl ,
plifled in construction yet ef?cient in operation.
supported on the top wall it thereof. The carAnother object of this invention is to provide
pacitor unit or units are preferably mounted
40
‘a novel switch assembly which is capable of be
ing mounted as a unit in an opening of a casing
forming the support for connected electrical ap
vdthin hollow insulator M and a terminal bush
ing l8 projects from the lower end of hollow in~
sulator l4 into supporting casing l2 through
opening 20 in top 'wall it. The capacitor insulat
These and other objects of this invention will 45 ing housing M may be of any desired insulating
become more apparent upon coisideration of the
material, preferably of porcelain or the like.
following description of a preferred embodiment
The housing i4 is preferably supported on top
thereof, when taken in connection with the at~
wall 16 of the supporting housing by means of a
tached drawing, in which:
metallic supporting plate structure 22, bolted as
Figure 1 is a diagrammatic view illustrating 50 at 23 to top wall H3. Supporting plate structure
one application for the invention,
22 may comprise a plurality of sheet metal lam
paratus.
'
Fig. 2 is a fragmentary view partially in sec
tion and partially in elevation of a capacitor sup
inations welded or otherwise secured together,
with the topmost lamination in the form of a
ring within which the lower end of capacitor
porting housing with the switch constituting this
55 housing I4 is positioned.
invention mounted therein,
2,406,321
a
1
Terminal bushing it of the capacitor structure
thereof spaced apart a distance less than the
is preferably provided with a central passage for
the reception of a capacitor terminal rod ill, the
outer end of which is threaded as shown. A ter
diameter of spherical contact til so that when the
switch is closed, as shown in Figs. 3 to 5, convex
example, as by a nut ‘2?.
strap 25 is preferably directed downwardly at
opposing opening movement of the switch blade.
It will also be noticed that the edges of slots 63
right angles and provided with a threaded open
ing for receiving an adjustable screw 28 which
angles to leave relatively sharp edge portions
portions of spherical contact M will be received in
minal strap 25 is secured to terminal rod 24, for Ch slot IE6 (Fig. 5) to form in effect a resilient detent
One end of terminal
are formed by cutting through the blades at right
forms one electrode of a spill-over gap. The 10 for engaging contact 555, with the result that the
other electrode of the gap may be formed by an
actual engagement between each blade 62 and
adjustable screw 28 spaced from screw electrode
contact Kill is substantially two point contacts.
25 and supported by a conducting strap (ill se
This clearly limits the contacting area of blades
cured to supporting plate
in any desired man
and contact til, and because of the relatively
ner, such, for example, as by welding or the like. 15 small contact area, the contact pressure may be
Supporting housing I2 is grounded, so that
relatively high. The contact pressure is pro
screw electrode 28 is also grounded through con~
duced. by reason of the fact that the outer ends
ducting strap
supporting plate 22 and sup
of blades 8:2, as stated above, normally occupy
porting casing ['12. Accordingly, upon the occur
a position spaced apart a distance substantially
rence of overvoltages, the gap between screw elec—
less than the diameter of contact Mr, so that in
trodes 2d and 28 will be broken down, and such
closing the switch, that is in moving blades $2
overvoltages may pass to ground.
from the dotted line position to the full line posi
Side walls 32 and till of supporting casing i2
tion shown in Fig. 4, blades 62 will engage an
may be provided with openings adapted to be
outer portion of contact M and will be forced
closed by cover plates 35 and
respectively,
relatively apart by the resulting cam action 01"
which may be bolted in place, as shown. Cover
the curved contour of the contact on the blades,
plate
is adapted to support applicant’s novel
until slots 6% are presented opposite the greatest
switching arrangement as a unit, so that it may
dimension of contact 1111, whereupon the blades
be removed with the cover plate from supporting
may move towards each other a slight amount
housing 322. As shown in Fig. 2, cover plate fl
while portions of contact Ml enter the slots iii
is provided with an insulating bushing {it extend~
in detent fashion. Movement of blades
apart
ing therethrough, and this bushing is provided
stresses the blades, and they will tend to move
with a central passage for receiving a terminal
back towards each other due to their inherent
rod 132 having one end extending outside the
resiliency, with the result that at the closed cir
housing it‘: for connection to other apparatus, and
having at its inner end within housing it), a
switch contact 44 formed thereon which is pro
vided with convex contacting portions, and, as
shown, is preferably in the form of a sphere. An
insulator lid is mounted on the inner side of cover
plate 38, and is adapted to support a generally
U-shaped blade support 48. The bight portion
of blade support 43 is secured to insulator 4B,
for example, as by a bolt ‘is, and the support is
provided with one leg 52 which is longer than,
and extends beyond, the other leg ?ll thereof, for
cuit position shown in Figs. 3 to 5, edge portions
of slots be will be maintained in engagement with
contact fill under considerable pressure.
In order to provide for closing a grounding cir
cuit before switch blade Ed is opened, there is pro
vided an angularly extending supporting member
and
63 secured
provided
to at
the
itsinner
outersurface
end with
of an
cover
aperture
plate for
Support
receiving a grounding
also has secured
blade operating
thereto ashaft
bearing
bracket T2 which is right angular in form with
one leg secured to support 68, for example, as by
a purpose to be hereinafter described. Blade
welding or the like, and with the other leg there
support 48 is adapted to pivotally mount a switch
of formed with an aperture providing a bearing
blade designated generally by the numeral 51%.
for operating shaft
spaced from support 68.
Switch blade 511i is adapted to be pivotally mount
An operating knob 74 may be secured to one end
ed intermediate the ends thereof with one end
of operating shaft iii as by a set screw '16, so that
constituting an operating arm 53 with its outer
the shaft may be manually rotated. On the other
end formed with a slot 58, for a purpose to be
end of actuating shaft lit are mounted grounding
hereinafter referred to. Operating arm 55 of
blades ‘ll’ maintained in predetermined spaced
the switch blade is provided at its inner end with
relation by a spacer block 15 to which the blades
an integral enlarged head Gil having secured to
are secured, in any desired manner, such, for ex
opposite sides thereof switch blades 62. Switch
ample, as by riveting or brazing. The blades and
blades
should be of a good conducting resil
spacer block l8 are also secured to operating shaft
ient material such, for example, as a copper alloy,
"if: in any desired manner, preferably by welding
and they may be secured to head 68 in any de
or the like. The outer ends of grounding blades
sired manner such, for example, as by brazing
'i'l are apertured to receive an operating pin St‘ for
or riveting. The inner ends of switch blades 82
switch blade it.
are provided with apertures aligned with an aper
In the operation of the switching arrangement
ture through head 66) for receiving a pivot pin
described thus far, let it be assumed that switch
{it also extending through legs 55] and 52 of 65 blade 5% is at its closed circuit position shown
the blade support, to pivotally mount blade 54
in Figs. 3 to 5, and that grounding switch blades
intermediate its ends. Blade 54 is preferably
"ii are at a position wherein they are spaced from
electrically connected with blade support 418 by
switch blade 54, all as shown in Figs. 3 to 5. Now
a ?exible shunt or the like 65, connected at its
when it is desired to open switch blade Ell, oper
ends with one switch blade 62 and blade support
ating knob 14 may be manually grasped and ro
45, respectively. The outer end of each switch
tated in a clockwise direction, as viewed in Fig. 4.
blade 62 is provided with an elongated slot 86
Such rotation of actuating shaft ltl ?rst brings
for receiving spherical contact lit in the closed
grounding blades l‘? into proximity with the outer
circuit position of the switch.
>
end of operating arm 5% of switch blade Ell. It
Switch blades 62 should have the outer ends
will be noted that one side 82 of slot 53 in the
2,406,321
5
operating arm is longer than the opposite side so
that upon continued rotation of operating shaft
6
‘H are operative to ground the capacitor struc'—
ture when in engagement with blade 54.
From the foregoing it will be apparent that
this invention not only results in the provision
‘iii in the same direction, operating arm 55 will
be received between grounding blades ll, and op
erating pin 80 will engage the side 82 of slot 58. Cu of a novel switch structure formed in a manner
such as to provide a novel detent operative to
This will electrically connect grounding blades
oppose opening movement of the switch, and also
‘ll and line switch blade Ell prior to opening move
constructed to provide a novel high pressure lim
ment of line switch blade 5d. Upon continued
ited area contact in the closed position of the
rotation of knob 74 in the same direction, switch
blade 56 is caused to rotate in a counterclockwise 10 switch, but that a novel arrangement of line and
grounding switch means are provided with but
direction about its pivot 64 to the open circuit po
one switch having an operating means, and the
sition shown in dotted lines in Fig. 4 of the draw
movable contact of this one switch adapted to
ing. It will be noted that grounding switch blade
actuate the movable contact of the other switch,
support 58 is provided with a stop lug
which
to thereby operate the switches in predetermined
may be formed integral therewith or rigidly at
sequence. In the particular embodiment of the
tached thereto in any desired manner, and this
invention disclosed, a grounding switch blade is
lug is engageable by grounding switch blades ll
provided for operating the blade of a line switch,
upon continued rotation of knob lit in a clock
so that the circuit is grounded before it is possible
wise direction when the dotted line position shown
in Fig. 4 is reached. It will be noted that operat~ 20 to open the line switch. Conversely, it is re
quired that the line switch be closed before the
ing pin 86 is received in slot 58 throughout open~
grounding circuit can be opened. In addition
ing movement of line switch blade 56, so that
to the foregoing, this invention comprehends the
throughout this movement blade 54 is positively
unitary assembly of a plurality of switching de
maintained in predetermined relation with re
spect to grounding switch blades ll. The line 25 vices on a single mounting panel which may also
comprise a closure for the opening in a support»
switch may be moved from the dotted line to the
ing housing for other apparatus.
full line position shown in Fig. 4 by rotation of
Having described preferred embodiments of the
operating knob ‘ill in the opposite direction, that
invention as required by the patent statutes, it
is, in a counterclockwise direction as viewed in
is desired that the invention be not limited to
Fig. tl. This results ?rst in closure of the line
this particular embodiment, inasmuch as it will
switch, because operating pin to is retained in
be apparent to persons skilled in the art that
slot 58 throughout movement of blade 51% from the
many changes and modi?cations may be made in
dotted to the full line position shown in Fig. 4.
this particular embodiment without departing
When the closed position of the line switch is at~
tained, pin 89 may ecsape from slot 58 and upon 35 from the broad spirit and scope of this invention.
Accordingly, the invention should be interpreted
continued rotation of operating knob ‘it in the
as broadly as possible and should be restricted
same direction, grounding switch blades ll will
only as required by the prior art.
be moved to the full line position wherein they
I claim as my invention:
are spaced from line switch blade 54.
1. Switching apparatus of the type described
It will be noted that the inner end of ground
comprising, main switch means having spaced in
ing switch blades ll are cut off as at 38 so as to
sulated terminals, a contact mounted for move
be engageable with stop lug 84 to limit movement
ment to and away from bridging relation with
of the grounding switch blades to their full open
respect to said terminals, a grounding contact
position shown in full lines in Figs. 3 and 4. Fur
mounted for movement in a path intersecting the
thermore, means are preferably provided for
movable contact of said main switch at least in
maintaining the operating shaft ‘it at its extreme
its closed circuit position, and actuating means
positions. This means is preferably in the form
for said grounding contact, whereby upon con
of a spring detent comprising a leaf spring 99
secured at one end as by a bolt 9! to grounding
tinued movement of said actuating means in a
blade support 68, and having at its other end a 50 direction to open the main switch circuit, said
grounding contact is ?rst moved to engage the
detent ?nger Q2 engageable through an opening
movable contact of said main switch means and
provided in support 68, with angularly spaced in
thereafter the latter is moved to an open circuit
dentations 88 provided in operating shaft 1%. In
position by said grounding contact.
dentations 88 are angularly spaced about the op
2. Switching apparatus of the type described
erating shaft at positions corresponding to the
comprising, main switch means having spaced in~
dotted and full line positions shown in Fig. 4.
sulated terminals, a contact mounted for move
Accordingly, it will be apparent that both switch
ment to and away from bridging relation with
blades are maintained in the full line position
respect to said terminals, a grounding contact
shown in Fig. ll by resilient detent means, com
prising the detent ?nger 92 for holding ground 60 mounted for movement in a path intersecting the
movable contact of said main switch, actuating
ing blades Ti, and the detent formed by slots [it
means operable in one direction to move said
in line switch blades 52 for holding blade 54. Fur
grounding contact into engagement with the
thermore, both blades are maintained at the
movable contact of said main switch means, in
dotted line position shown in Fig. 4 by detent
ter?tting means on said contacts adapted to be
?nger 92, and by the engagement of operating
engaged when said movable contacts are in en
pin 86 in slot 58 of switch blade 54.
gagement, and the paths of movement of said
Cover plate 38 supporting the novel switch as
movable contact being such that said inter?tting
sembly may also be provided with a vent pipe as,
means remain in engagement, whereby upon con
if desired.’ Switch blade support 48 is electrically 70 tinued operation of said actuating means in said
connected with terminal rod 24 of the capacitor
one direction to said bridging contact is moved
unit by a conductor strap 95. It will be apparent,
to open circuit position, and upon operation of
therefore, that switch blade 54 is operable to con
said actuating means in the opposite direction
trol the circuit from the capacitor structure to
said bridging contact is ?rst moved to closed cir
termina1 rod 42, whereas grounding switch blades 75 cuit position and thereafter said grounding con
2,406,321
l
tact is disengaged from said bridging contact
and movable to a position spaced therefrom.
3. In switch structure, a ?rst contact mounted
for movement into and out of engagement with
a
cooperating
contact,
a
movably
mounted
with said one contact to actuate said one contact
into and out of engagement with said cooperat
ing contact, and means for actuating said other
contact.
'7. In a switch structure, a ?rst contact pivot
grounding contact, said movable contacts having
portions adapted to be in engagement during
aily mounted intermediate its ends, a second piv
otally mounted contact, means supporting said
movement of said ?rst contact, the path of move
contacts so that a part of the path of movement
ment of said grounding contact extending be
of an end portion of one contact intersects the
yond its movement in engagement with said ?rst 10 path of movement of an end portion of the other
contact, whereby said grounding contact is mov~
of said contacts, whereby said one contact is
able to and from a position spaced away from
said ?rst contact into engagement with said ?rst
contact to actuate said ?rst contact into and
out of engagement with said cooperating con
tact, and means for actuating said grounding
contact.
4. In a switch structure, a ?rst contact pivotally
mounted for movement into and out of engage»
ment with a cooperating contact, a pivotally
mounted grounding contact, said movable con
tacts having portions thereof traversing arcuate
paths of movement which intersect with the path
of movement of said grounding contact portion
extending beyond the path of movement of said
?rst contact portion in one direction, whereby
said grounding contact is movable to and from
a position spaced away from said ?rst contact
into engagement therewith to actuate said ?rst
contact into and out or engagement with said co-.
operating contact, and means for actuating said
grounding contact.
5. In a switch structure, a ?rst contact piv
movable to and from a position spaced ‘from said
other contact into engagement therewith and is
also movable when in engagement to cause move~
ment of said other contact, and actuating means
for said one contact.
8. In a switch structure, a ?rst contact pivot
ally mounted intermediate its ends, a second piv
otally mounted contact, means supporting said
contacts so that a part of the path of movement
of
end portion of one contact intersects the
path of movement of an end portion of the other
of said contacts, freely engageable pin and slot
means on said contact portions, respectively,
whereby said one contact is movable to and from
a position spaced from said other contact into
engagement therewith and is also movable when
i i engagement to cause movement of said other
contact in opposite directions, and actuating
means for said one contact.
9. Switching apparatus of the type described
comprising, main switch means having spaced
insulated terminals, a contact mounted for move
11
t to
away from bridging relation with
movement of one end of said contact into and
respect to said terminals, means frictionally re
out of engagement with a cooperating contact,
taining said contact in closed circuit position, a
a grounding contact mounted for movement in
grounding contact mounted for movement in a
a path intersecting and overlapping the other
path intersecting the movable contact of said
end of said first contact, whereby said grounding
main switch at its closed circuit position, actuat
contact is movable to and from a position spaced 40 ing means operable in one direction to move said
away from said ?rst contact into engagement
grounding contact into engagement with the
with said other ‘end of said ?rst contact to ac
mov ole contact of said main switch means, in
tuate said ?rst contact into and out of engage
ing means on said contacts adapted to be
ment with said cooperating contact, and means
engaged to prevent relative movement of said
for actuating said grounding contact.
contacts when said movable contacts are in em
6. In switch structure. a ?rst contact mounted
gagement, and means limiting movement of said
for movement into and out of engagement with
grounding contact from a position in engagement
a cooperating contact, a second movably mounted
with said main switch contact when the latter
contac"
movable contacts having portions
is at an open circuit position to a position where
adapted to be in engagement during movement
in said main switch is closed and said grounding
of one of said movable contacts, the path of
contact is spaced from said main switch contact,
ement of the other of said. movable contacts
whereby said main switch contact is frictionally
ending beyond its movement while in engage
held at its closed circuit position and is incapable
ment with said one contact, whereby said other
of movement relative to said grounding contact
contact is movable to and from a position spaced
at other positions thereof.
‘
away from said one contact into engagement
WILLIAM H. CUTTING.
otally mounted intermediate the ends thereof for
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