close

Вход

Забыли?

вход по аккаунту

?

Патент USA US3064116

код для вставки
Nov. 13, 1962-
K. H. DATE
3,064,107
SWITCHING DEVICE
Filed Oct. 14, 1960
3 Sheets—Sheet 1
plah.iuxlv
T
.
M9
INVENTOR.
759200 iii/way 0/472?
BY
Nov. 13, 1962
K. H. DATE
3,064,107
SWITCHING DEVICE
Filed Oct. 14, 1960
5 Sheets-Sheet 2
INVENTOR.
K6200 iii/we)’ D472
?rra/ewiy
Nov. 13, 1962
K. H. DATE
~
3,064,107
SWITCHING DEVICE
Filed Oct. 14, 1960
5
3 Sheets-Sheet 3
f.
A
I
INVENTOR.
B
gfqzw Fla/vex 5972'
ilnited bétates Patent
3,%4,litl7
Patented Nov. 13, 1962
3
2
3,664,107
SWITCHING DEVKQE
Kazan Henry Date, South Milwaukee, Wis, assignor to
McGraw-Edison \ilornpany, Milwaukee, Wis, a corpora
tion of Delaware
Filed 0st. 14, 196i), Ser. No. 62,759
5 Claims. (Ql. 200—17il)
This invention relates to switching devices and, more
particularly, to air disconnect switches.
it is the primary object of the invention to provide
self-aligning stationary contact structure for an air dis
the resiliency of said springs provides contact pressure
with body portion 24 and switch blades 12. Thus, cur
rent transfer is eiiected between body portion 24 and
switch blades 12, through a large number of parallel
paths comprising the individual spring convolutions of
springs 28.
A more detailed description of the contact
structure just de?ned may be found in copending appli
cation Ser. No. 847,263, ?led October 19, 1959, and
which is assigned to the assignee of the instant invention.
Referring speci?cally to FIGS. 4 and 5, the stationary
contact jaw 18 is shown to include a body portion 34)
and a base portion 32 which is a?ixed to porcelain in
sulator 20. In addition, an interrupter mounting plate
connect switch.
This and other objects and advantages of the inven
33 is secured between base 32 and bushing 20 and
tion will become more apparent from the detailed de 15 includes an integral terminal pad 34 for connection
scription of the invention taken with the accompanying
drawings in which:
lFIG. 1 is a side elevational view, with parts broken
away, of the load break disconnect switch embodying
the instant invention;
FIG. 2 is a top plan view of the device shown in
FIG. 1;
FIG. 3 is a top segmented view, partly in section, illus
trating the various current interchange and anti-rebound
to the other line wire (not shown).
Current interchange structure 35, for rendering con
tact jaw 18 self-aligning relative to the switch blades
12, is disposed in recesses 36 formed in the opposite
sides of the body portion 39 of stationary contact jaw
18 and each includes a helically wound conductive cur
rent interchange spring 37 and a contact plate 38. Each
of the current interchange springs 37 is disposed in a
circular groove 49 formed on the inner surface of re
25 cess 36. Contact plates 38 are also circular and each
structures according to the instant invention;
has an embossed rim 42 engageable with retaining rings
FIG. 4 is an elevational view, with parts broken away,
of the disconnect switch self-aligning contact structure;
44 affixed to the peripheries of recesses 36 and which
and
hold plates 38 in engagement with the convolutions of
FIG. 5 is a view taken along lines 5—5 of FIG. 4.
their associated current interchange springs 37.
In general terms, the invention comprises a stationary
A plurality of dimples 46 are formed in the outer
contact jaw of an air disconnect switch comprising a
surface of each of the contact plates 38 and extend toward
body member having a recess formed‘ therein, ‘a helically
the switch blade 12 to provide points of contact there
with.
wound, conductive current interchange member disposed
in said recess with its helical axis lying in a plane sub‘
The lower portion of each of the grooves 40 ‘is V
stantially parallel to the direction in which the switch
shaped so that they will contact each of the convolutions
blade pivots and contact means one side in resilient rock
of their associated springs at two points. In this man
ing engagement with the spring member and engageable
ner, a pair of parallel current paths are provided through
on its other side by the spring member.
each spring convolution thereby substantially lowering
Referring to the drawings in greater detail, the in—
the voltage drop across the interchange structure and
vention is illustrated in connection with the combina 40 also reducing the heat generated in the spring itself.
tion of, an air disconnect switch, designated generally
Retaining rings 44; are so located relative to grooves
by the reference numeral 10, and a load interrupting
4t} that the distance between contact plates 38 and the
device 11. The disconnect switch 19 includes a pair
inner portion of grooves 40 is smaller than the outside
of parallel switch blades 12 pivotally mounted on a
helical diameter of the spring 37 so that each of the
conductive hinge joint 14, which, in turn, is mounted
spring convolutions is forced to lay over at an angle
atop a ?rst porcelain bushing 15. A stationary contact
relative to its helical axis. Here again, the inherent
jaw 18 is disposed atop a second porcelain bushing 2i}
and is engageable by the switch blades 12 when the
latter are moved into their closed position seen in FIG. 1.
Terminal pad 25 is also secured to the upper end of
bushing 16 and is adapted to receive a line conductor
(not shown). Contact jaw 18 may be provided with a
releasable latch (not shown) for preventing unintentional
movement of switch blades 12 under the in?uence of
magnetic forces incident to heavy currents.
The hinge assembly 14 includes a base portion 22
a?ixed to bushing 16 and a body portion 24 to which
the switch blades 12 are hingedly mounted by means
of a pivot bolt 26 and a nut 2''].
Current transfer be
resiliency of springs 37 provides contact pressure with
the contact plates 38 and the body portion 39 of con
tact jaw 18.
When the switch blades 12 are in their open position
the current interchange springs 37 force contact plates
38 outwardly until the rims 42 engage the retaining
rings 434-. This will allow the springs 37 to straighten
out somewhat but the gap between contact plates 38
and grooves 43 will be insuf?cient to allow them to
assume a normal position relative to their helical axes.
‘When switch blades 12 are returned to their ‘closed posi
tion they are guided into alignment with the current in
terchange structures 35 by slanting surfaces 43 formed
tween the body portion 24 of hinge member 14 and 60 on the upper end of body portion 30. When dimples
the switch blades 12, is accomplished by means of a
46 are engaged, each of the contact plates 38 will be
pair of helically wound annular current interchange
forced inwardly toward grooves 4% thereby causing cur
springs 28 composed of a suitable conductive material
rent interchange springs 37 to lay over at a greater angle
and disposed in a pair of annular grooves 29 formed
which increases the contact pressure between dimples
in the lateral sides of body portion 24.
46 and the switch blades 12 as well as between the cur
Body portion 24, switch blades 12, pivot bolt 26 and 65 rent interchange springs 37 and the contact plates 38,
nut 27 are constructed and arranged so that the dis
tance between the bottom of grooves 29 and the inner
sides of switch blade 12 is less than the outside helical
diameter of the current interchange springs 28. This
on the one hand, and the body member 31} on the other.
It will be appreciated that the current interchange struc
ture 35 just described allows a large degree of misalign
ment between switch blade 12 and stationary contact jaw
forces the individual convolutions of springs 28 to lay 70 18 without a substantial reduction in its current transfer
over at an angle relative to their helical :axis whereby
ring abilities because each of the contact plates 38 ?oats
3,054,107
3
on its associated current interchange spring 37. As a
result, the contact plates 38 are rockable as well as mov
able axially of grooves 49. In addition, because each of
the contact plates 38 is providedwith three dimples 46,
three points of contact with each of the switch blades 12
will be maintained even though the switch blades 12 are
closed in at an angle relative to contact jaw 18.
From the foregoing it will be apparent that the current
path through the disconnect switch 1%) is from terminal
pad 25, through the body portion 24 of hinge member 14,
the current interchange springs 28, the switch blades 12,
the contact plate 38, the current interchange springs 37,
the body portion 36‘, and out of the rear terminal pad 34.
Turning now to the load interrupter 11 it is shown to
include a ?rst quick break blade 56 pivotally mounted on
one of the switch blades 12 and a second quick break
blade 52 pivotally mounted in an arc chute 54 disposed
adjacent the stationary contact jaw 18.
The are chute 54. comprises a pair of complementary
plates 55 of any suitable insulating material and each is
preferably lined with a substance capable of evolving an
arc extinguishing gas when subject to an arc, such as a
4
blades 12 become disengaged from stationary contact jaw
18, the quick break blades 59 and'52 will engage thereby
providing an auxiliary current path around stationary con
tact jaw 18. This auxiliary path is from terminal pad 25,
through hinge member 14, switch blades 12, hinge assem
bly 61), quick break blades 58 and 52, hinge assembly 83,
bracket member 59, and out terminal pad 34. After the
auxiliary load path has been established, further move
ment or" switch blade 12 towards its fully open position dis
en-gages it from the stationary contact jaw 18.
Torsion springs 71} and 86 are so proportioned that as
switch blade 12 rotates toward its open position, quick
break blade Stl will remain in parallelism therewith and
quick break blade 52 will be pivoted in a clockwise direc
tion. This will continue until quick break blade 52 en
gages a resilient stop 92 identical with stops 72 and 88,
described above, whereupon further rotation thereof is
prevented. When blade 52 is in this position, indicated
by the reference numeral 52’ in FIG. 1, the torsion spring
20 36 will be fully loaded. Continued rotation of switch
blade 12 will then cause relative rotational movement be
tween switch blade 12 and quick break blade 58 until they
?bre, synthetic resin, or the like. A spacer member 56 is
achieve their intermediate positions shown by phantom
provided between plates 55 and along three of the edges
thereof for maintaining them in spaced relation when they
lines and indicated by reference numerals 12’ and ill’
respectively in FIG. 1. When blade 50 is in this position,
the torsion spring 76 will also be fully loaded and the
tips of blades 50 and 52 will just be in engagement. Addi
are secured together by any suitable means, such as rivets
57. The are chute 54 is supported adjacent the stationary
contact jaw 18 by a conductive supporting bracket 59 inte~
tional pivotal movement of switch blades 12 will cause the
gral with the mounting plate 33 and extending upwardly
tips of quick break blades 50 and 52 to disengage drawing
therefrom.
The ?rst quick break blade 50 is pivotally mounted on
an arc therebetween. Torsion springs 70 and 86 will then
cause the blades 56 and 52 to move rapidly in opposite
one of the switch blades 12 by means of a hinge assembly
60 which is shown in FIG. 3 to include a rod 62 ai?xed to
blade 50 and a cylindrical housing 64 af?xed to switch
blade 12. Current is transferred between rod 62 and
thereby
directionsrapidly
and toward
elongating
theirtherespective
are so that
stops
interruption
72 and is
enhanced. In addition, quick break blades 5% and 52 will
housing 64 by means of a pair of current interchange
springs 66 disposed in a pair of annular V-in-cross-section
con?ned and controlled within the arc chute 54.
In addition, the massive heads and the resilient mount
ings of stop members 72 and 88 will absorb the energy of
grooves formed on the inner surface of housing 64. The
depth of grooves 68 are less than the outside helical diam
eters of current interchange springs 66 so that each of
the convolutions of said springs are forced to lay over
at an angle relative to their helical axes. This provides
bearing pressure between the springs 66 and the shaft 62
and sleeve 64. A torsion spring 74} surrounds housing 64
and engages the switch blade 12 and quick break blade 5%
for biasing the latter into engagement with a resiliently
mounted stop 72.
Stop 72 includes a massive head portion 73, a reduced
waist portion 74 and a stem portion 76 which extends
through an aperture 78 in switch blade 12. The base 79
of waist portion 74 is resiliently urged against the side of
switch blade
rounds stem
switch blade
stem portion
part at a point between plates 55 so that the are will be
quick break blades 50 and 52 respectively thereby eliminat
ing the possibility that either will rebound which would
bring them into proximity and thereby increase the possi
bility that the arc would be restruck.
Upon reaching its fully open position, the quick break
blade 50 will again be in parallelism with switch blade 12
as shown by phantom lines and indicated by the reference
numerals 50" and 12" in FIG. 1. The second quick
break blade ‘52, on the other hand, will return to its initial
position shown by full lines.
When the switch blade 12 is pivoted toward its closed
position the quick break blades 50 and 52 will engage
thereby re-establishing the auxiliary current path, prior
to the engagement of the switch blades 12 with the sta
12 by a compression spring 80 which sur
tionary contact jaw 13. Also, the spring which biases
portion 76 between the opposite sides of
12 and a washer 81 a?'ixed to the end of 55 stop 72 is made to exert a greater force than the spring
which biases stop 88 so that as switch blades 12 are
76.
A hinge assembly 83 identical to the hinge assembly 60
moved into their fully closed position, quick break blade
51) will force quick break blade 52 and stop 82 to de?ect
is affixed to conductive bracket 59 and extends through
to their positions shown by phantom lines and indicated
one of the plates 55 for pivotally supporting the second
quick break blade 52 within arc chute 51%. A torsion spring 60 by the reference numerals 52" and 88" respectively.
After the tip of blade 50 passes the tip of blade 52, the
86 in bearing assembly 83 (the end of which is shown in
resilient mounting of stop 88 returns quick break blade
FIG. 1) resiliently urges the second quick break blade 52
52 to its initial position shown by full lines. The de
against a stop member 83 substantially identical with stop
vice is thereby reset for the next operation. In this man
member 72 and which is resiliently supported on bracket
member 59 and extends through an aperture in the side of 65 ner, also, the auxiliary load path is opened so that all of
the current is carried through the disconnect switch 10.
plate 55.
.
It
can be seen, therefore, that current is carried through
When the disconnect switch is in its closed position,
the quick break blades 50‘ and 52 only during an opening
shown by full lines in FIG. 1, the ?rst quick break blade
or reclosing operation. It will be appreciated, too, that
56 is parallel to switch blade 12 and in engagement with
resilient stops 72 and 83 perform the functions of absorb
stop 72. The second quick break blade 52 is in engage- ' ing the energy of the quick break blades and also for
ment with stop 88, also as shown by full lines in FIG. 1.
allowing the resetting thereof.
As the switch blades 12 are moved toward open position
While the self-aligning contact structure is shown in con
by exerting a force upon pull ring 90, the switch blades 12
junction with a particular load break disconnect switch it
will begin to move out of engagement with the stationary
will be appreciated by those skilled in the art that it
contact jaw 18. Prior to the point at which the switch 75 has application as well to any type of switching device
3,064,107
6
wherein a movable switch blade engages a stationary con
siliently support said contact members for rocking engage
tact jaw. In addition, while this contact structure has
been illustrated in conjunctio .i with a pair of switch blades,
ment independently of said body means and to provide a
it has application as well to a single bladed device wherein
the current interchange means are disposed on either side
thereof. Accordingly, although only a single embodiment
current interchange therebetween, said spring members
forcing said contact members into electrical engagement
with spaced apart portions of said movable contact means
when the latter is in engagement with said movable con
tact assembly to provide self-aligning, high pressure, elec
of the invention has been shown and described, it is in
tended to cover in the appended claims all modi?cations
trical engagement between said stationary contact assem
and embodiments of the various aspects of the instant in
bly and said movable contact means.
.
vention that fall within the scope of the invention.
4. In a switching device having a stationary contact
10
I claim:
assembly and contact means movable into and out of
1. In a disconnect switch having a pair of spaced apart
engagement with said stationary contact assembly, said
insulating bushings, a stationary contact jaw mounted on
stationary contact assembly including stationary body
one of said bushings, switch blade means mounted on the
means having recess means provided therein, a pair of
other of said bushings and pivotal into and out of engage 15 helically wound conductive current interchange spring
ment with said contact jaw, said contact jaw including a
members disposed in spaced apart relation within said re
body member having a pair of recesses formed therein, a
cess means, the helical axis of each of said spring means
helically ‘wound, conductive, current interchange spring
lying in planes which are substantially parallel to a plane
member disposed in each of said recesses with their helical
containing the movable path of said contact means, a pair
axes lying in planes substantially parallel to the plane in 20 of distinct contact members disjoined from said body
which said switch blade means pivots, a distinct contact
member disjoined from said body member and disposed
adjacent each of said spring members, substantially all
of the individual convolutions of said spring members be
ing in engagement with said body member and their as
sociated contact members to resiliently support said mem
bers for rocking engagement independent of said base
member and to provide a current interchange path there
between, said spring members also forcing said contact
means and each being disposed within said recess means
adjacent one of said spring members, substantially all of
the individual convolutions of said spring members being
in engagement with its associated con-tact member and
25 said body means to resiliently support said contact mem
bers for rocking engagement independently of said body
means and to provide a current interchange therebetween,
said spring members forcing said contact members into
electrical engagement with spaced apart portions of said
members into high pressure engagement with said switch 30 movable contact means when the latter is in engagement
blade means to provide self-aligning, high pressure elec
with said stationary contact assembly to provide self
trical engagement between said body member and said
aligning electrical engagement between said stationary,
switch blade.
contact assembly and said movable contact means.
2. In a disconnect switch having a pair of spaced apart
5. In a switching device having a stationary contact
insulating bushings, a stationary contact jaw mounted on 35 assembly and elongate contact means movable into and
one of said bushings, a pair of parallel interconnected
out of engagement with said stationary contact assembly,
switch blades mounted on the other of said bushings and
said stationary contact assembly including body means
pivotal into and out of engagement with said contact jaw,
having a pair of spaced apart, opposed recesses formed
said contact jaw including a body member having a recess
therein, a helically wound conductive current interchange
formed on each of the opposite sides thereof, a helically 40 spring member disposed in each of said recesses, the helical
wound, conductive, current interchange spring member dis
axis of each of said spring members lying in planes
posed in each of said recesses with their helical axes
which are substantially parallel to a plane containing the
lying in planes substantially parallel to the planes in
movable path of said elongate contact means, a distinct
which said switch blades pivot, and a distinct contact
contact member disposed in each of said recesses adjacent
member disjoined from said conductive base and disposed 45 one of said spring members and disjoined from said body
adjacent each of said spring means, substantially all of the
means, substantially all of the individual convolutions of
individual convolutions of said spring members being in
said spring members being in engagement with said body
engagement vwith said body member and one side of their
means and its associated contact member to resiliently
associated contact members to resiliently support said con
support said contact member for rocking engagement
tact members for rocking engagement independent of said 50 independently of said body means and to provide a cur
body member and to provide a current interchange path
rent interchange therebetween, said spring members forc
therebetween, said contact members each being engage
ing said contact members into electrical engagement
able on its other side by one of said switch blades to
with opposed, spaced apart portions of said movable con
provide self-aligning, high pressure, electrical engagement
tact means when the latter is in engagement with said
between said body member and said switch blades.
55 stationary contact assembly to provide self-aligning, elec
3. In a switching device having a stationary contact
trical current interchange between said stationary contact
assembly and contact means movable into and out of en
assembly and said movable contact means.
gagement with said stationary contact assembly, said sta
tionary contact assembly including stationary body means
References Cited in the ?le of this patent
having recess means provided therein, a pair of helically 60
UNITED STATES PATENTS
wound conductive current interchange spring members
disposed in spaced apart relation within said recess means,
1,966,234
Cox et al. ____________ __ July 10, 1934
a pair of distinct contact members disjoined from said
2,063,954
Ramsey ______________ __ Dec. 15, 1936
body means and each being disposed Within said recess
2,226,385
Ramsey _____________ ___ Dec. 24, 1940
means adjacent one of said spring members, means for 65 2,709,739
Gilliland et al _________ __ May 31, 1955
holding said contact members in engagement with said
2,751,471
Wills ________________ __ June 19, 1956
spring members wherein the distance between said contact
2,948,794
Fjellstedt et al. ________ __ Aug. 9, 1960
members and said body members is less than the normal
FOREIGN PATENTS
outside helical diameter of said spring members whereby
the individual convolutions of said spring members are 70
29,822
Great Britain __________ __ Dec. 3, 1914
forced to lay over so that substantially all of the individ
of 1913
ual convolutions of said spring member are in engagement
133,830
Austria ______________ __ June ‘26, 1933
with said body means and said contact members to re
1,063,687
Germany _____ __v _____ __ Aug. 20, 1959
Документ
Категория
Без категории
Просмотров
0
Размер файла
713 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа