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Патент USA US2411894

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. 3, 1946.
4
G; w. PETERS
2,411,894 `
ARC EXTINGUISHING CHAMBER FOR CIRCUIT BREAKERS
Filed Feb. 9, 1944
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2 Sheets-Sheet 1
Dec. 3, 1946.
G. w. PETERS
_ 2,411,894
ARC EXTINGUISHING CHAMBER FOR CIRCUIT BREAKERS
Filed Feb. 9. 1944
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Patented Dec. 3, 1946'
2,411,894
UNITED STATES PATENT oFFlcE
2,411,894 '
ARC EXTINGUI'SHING CHAMBER FOR
CIRCUIT BREAKERS
\
.
Gerhard W.‘Peters, Akron, Ohio
Application February 9, 1944, serial No. 521,613
l
3 Claims. (Cl. 20D-144)
My invention relates in general to electric
switches and more particularly to quick-acting
circuit interrupting switches which may be actu
ated electro~magnetically- or otherwise.
An object of my invention is the provision of
a split insulating housing having an arc chamber
for an electric switch having stationary contact
means mounted upon one ofthe parts of the split
housing and having the movable contact means
projecting into an opening through the other part
of the split insulating housing, the contact means
and the split insulating housing means being so
arranged that when the part having the opening
therein is removed, the stationary contact means
becomes readily exposed and accessible for in
spection and replacement.
Another object _of my invention is the provision
,
,
2
Another object of my invention is the provi~
sion of detachably removing the movable contact
means without removing the insulating housing.
Other objects’and a fuller understanding of the
invention may be had by referring to the follow
ing description and claims, taken in conjunction
with the accompanying drawings, in which:
Figure 1 is a top view of a switch embodying
the features of my invention;
Figure 2 is a front elevational view of the device
shown in Figure 1 with certain parts broken away
to illustrate more clearly the construction of the
arc chamber and the stationary contacts;
Figure 3 is a side elevational view of the device
shown in Figure 2, taken along the line 3_3
thereof;
'
Figure 4 is a view similar to Figure 3, illustrat
of preventing the removal oi one of the parts of
ing the manner in which one of the split parts of
the split insulating housing when the movable
contacts are in their operative motion transmit 20` i the insulating housing is removed; and
ting position.
`
Figure 5 is a view along the line 5_5 of Figure
4,
showing the split part oi.' the housing which is
Another object .of my invention is to prevent`
the removal of one of the parts oi’ the split insu
removed.
lating housing unless the movable contacts and>
'
With reference to the drawings, the switch is
designated generally by the reference character
the motion transmitting means which operate 25
I2 and is arranged to be operated by an actuating
.
electro-magnet indicated by the reference char
Another object of my invention is the pro
acter I3.
`
vision of resilient means interposed between the
The
switch
I2
and
the
actuating
electro-mag
movable contact means and the actuating mech
anism, the resilient means being so disposed that 30 net I3 may be mounted on a base I0 having holes
II therein to facilitate the anchoring of the en
it is mounted externally of the insulating housing
tire assembly to a suitable support, The actuat
to be free from the arc in the insulating housing.
ing electro-magnet I3‘may be of any suitable de
Another object of my invention is to prevent
sign orV construction and is arranged to be ciec
the movable contact means during the circuit in
trically energized by the conductors 5ft, and acts
terrupting movement from being withdrawn from
the opening in the insulating housing in which ce to close the switch I2 when energized, in a man»
ner to be described. The actuating electro-mag
the movable contact means operates.
net I3 has an operating member @fl extending upn
Another object of my invention is the provision
wardly from one side thereof. As illustrated, the
them are tlrst removed.
operating member 4'! is in its lower or retracted
ñrst separated in the large chamber, after which
the movable contact immediately moves into the
small chamber, the movable contact being arrest»
ed in its separating movement in the small cham»
40 position. The downward travel of the member ci
opens the contacts and is arrested by means of
the adjustable nuts Itâ.
In the drawings, the switch i2 is arranged to
ber, or at least prior to a point where the area 45 interrupt a three phase circuit by three sets of
contacts designated, respectively, as A., B and C
between the movable contacts and the side wall
disposed
in a split insulating housing. The set
of the small chamber equals the cross-sectional
of contacts A, B and C for the respective phases
area of the small chamber.
` . J
of the electric circuit are of the same construc
Another object of my invention is to provide> a
housing having a large chamber in which the sta 50 tion and correspondingl parts bear the same reiu
erence character. As shown, each set of con
tionary contact is mounted and having a smaller
tacts is arranged to produce a “double-break”
chamber connecting the large chamber with the
and comprises two stationary contact means I8
outside of the housing forming an opening
and It! and two movable contact means 2U and 2 I.
through which the movable contact is actuated
The contact means I8 and 20 comprise one pair
to engage the stationary contact.
»
55
o1' contacts and the contact means I9 and 2|
.
- comprise another pair of contacts'. The pair of
contacts consisting of the contact means I9 and
2l are disposed closer to the base It than the
~ pair of contacts consisting of the contact means
i3 and 20. The movable contact means 20 and
2l are connected together by a bridge member 53.
As illustrated best in Figure 2, the bridge mem
anchored to the base I0 by means of screws I5
- `
and the actuating electro-magnet I3 may be an
chored to the base I0 by screws 36. The movable
contact means and the motion transmitting
means I6 in their operative position are disposed
in the said gap `and obstruct thewithdrawalof
the insulating body member 23, so that the re
movable insulating body member 23 cannot be
bers 53 for the respective phases A, B and C are ,
removed when ‘the switch- is in its operative
arranged to be simultaneously'actuatedby a mo
position. '
'
10
tion transmitting means i3 which isl actuated
As illustrated, the motion transmitting means ,
by the member ¿I1 of the actuating electro-mag
It comprises a movable"cross-arm 63 which isv
net i3.
.
Each of thefpair of contacts is arranged to be 'Í
interrupted in a split insulating housing compris
ing two partsv 22 and 23. The part 22 comprises
an insulating `support member and the part 23
comprises an insulating body member adapted '
to be detachably connected to thelinsulating sup
port member by »screws ¿i5 which extend through
holes 51 in the insulating body member 23. The 20
insulating support member and the insulating
body member have mating wall surfaces it and
arranged to be detachably connected to the mem
ber d1 of the actuating electro-magnetv I3 by
means- of screws d8. Mounted at spaced inter
vals upon the movable cross-arme@ Aare three
spring cages 5i which contain a spring 52 and
the bridge member 53 which carry upon each
end thereof the movable contact means 2o-=and `
2i. The spring cages 5i comprise a U-shaped
member in which the side members thereof havel
their upper ends provided with inturned ñanges ,
5e which constitute stops for holding the bridging
member 53 within the spring cageâi under >the
forming the, split between the members. The
compression of the spring 52. Each side edge
split insulating housing has individual arc cham 25 of the bridging member 53 is provided' with a
bers for each of the pair of separable contacts.
notch presenting shoulders 55 for engaging theThe arcs chambers are designated by the refer
side edges of the‘spring- cage 5i. The shoulders
ence characters 2d and 25. The arc chambers
55 prevent a lateral movement of the bridging
2d respectively enclose the _stationary ‘contact
member 53- within the> spring cage 5I. As the
I1, respectively, abutting against each other and
-means IB and comprise a recess 4I and the arc 30 movable contact means engage the stationary
chambers 25 respectively enclose the stationary Y contact means, the spring 52 -is compressed and
contact means’iß- and comprise a recess B2. The
4i is closed by a wall`
thereby assures that all of the pairs of contacts
are making a. Aresilient pressure engagement.
v upper end of the recess
portion 43 which is part of the mating split wall
Each of the bridging members 53 and the mov
I6 or the insulating supporting housing 22. Simi-_ 35 able contacts carried thereby may be readily re
larly, the upper end of the recess 42 for the sta
moved from the spring cage 5I by manually de
tionary contact means I9 is closed by a wall por
pressing the spring 52 and then turning thev
tion 4e which'also comprises a part of the mating
bridge member 53 until at least one of the notches
splitwall IB of the insulating supporting housing'
on the side edge of the bridging member 53 clearsA
22. The lower end of the recess 4I is'provided
the inwardly turned flange 54, after which the
with an opening 39 in which the movable contact _
means 20 is operated by the motion transmitting
means I4. The Alowermost 'end of the recess 42’
' bridging member may be removed from the springcage 5I. A new bridging ~member 53 may be
mounted within the spring cage 5i in the reverse
manner. Therefore, in my invention the bridging
members 53 and the movable contacts carried
thereby may be individually removed with the
insulating housing in its fixed normal operating
is provided with an opening 40 in which vthe
' movable' contact means 2l is operated by the
motion transmitting means I4. The stationary
contact means I8 and I9 are of the same con
struction and comprise a post 2E having a ter
, minal extension 21 provided on the upper end
' position.
e thereof and ‘having- a replaceable contact element 50, l
In other words,~I am able to remove
and inspect the movable contacts without remov
ing the housing.
32 removably mounted on the lower end thereof.
In> operation, all of the movable contact means
The terminal extensions 21 extendthrough open
are operated substantially simultaneously by up
ings` in' the insulating support member 22 4and . ward movement of the motion transmitting means
are securely fastened‘to the insulating support
I4 for closingI the three phases of the electrical
member 22 ‘by’ terminal nuts 28. A shoulder 29 .55 circuit. Upon the interruption of the movable
which is provided between `the post 26 and the
contact means by a downward movement, a “dou
terminal extension 21 rests against a washer 3_0
ble brea ” occurs between the line cgnductors 34 i
which is embedded in the insulating support
and 35 of each of the phases A, B’and C. The
member 22. The lower end of the post 261s pro
interruption occurs upon de-energizing the ace
vided with a reduced threaded portion 3| and. 60 tuating electro-magnet I3, and is made to occuris arranged to threadably engage a replaceable
quickly by sudden expansion of the'compressed
contact element 32. The underneath side of the
springs 52 reacting upon the motion transmitting
replaceable contact element 32 may be provided
means `I4 and giving it a quick kick downwardly.
with a contact tip member 33 which is arranged y
As the movable contact means for each pair of
to be engaged by a contact tip member 38 pro 65 contacts is separated from the stationary con
vided on thev contact element l31 ofthe movable î tact means, the arc between the separable con
contact means.
f .
.
tacts is in the recessed arc chamber which houses
The insulating »support member 22 and the
the pair of contact means. As the movable con
actuating electro-magnet I3 are so positioned
tact meansfor the pair ~is >quickly withdrawn
upon the base IIJ that a gap exists between the 70 -from‘ the` stationary contact means, if the arc
contacttip members 33 on the stationary contact
between the contact means is not immediately
’ means and the end 56 of the operating member
41 to provide a space for the removal of the re
movable insulating body member 23. The sta
ruptured, it tends to follow the movable contact _
means into the opening through which the mov
able contact means operates. The movement of
tionary insulating support member 22 may be 75
2,411,894
5
the movable contact means is arrested when the
adjustable nuts 49 engage the electro-magnet
externally of the insulating housing so that they
are free from the iniluence of the arc in the arc
chambers. In other words, the springs 52 are
free from heat or other damaging influences, or
burning, which would otherwise occur if they
were mounted within the arc chambers or other
constitute guides for the'movable contact means,
which ñt in the openings with a small clearance , wise exposed to the are in the arc chambers.
Although I have described my invention with
therebetween, and the small chambers above the
movable contact means when in their downward 10 a certain degree of parti'cularity, it is understood
that the present disclosure has been made only
arrested position, are therefore substantially
by way of example and that numerous changes in
closed chambers. As shown inthe drawings, the
the details of construction and the combination
post 2‘6 in the recess 24 projects from the end wall
and arrangement of parts may be resorted to
portion 43 thereof into said recess to a point
without departing from the spirit and the scope
therein, whereby the contacts separate in a region
which is closer to the opposite end wall of the 15 oi' the invention as hereinafter claimed.
What is claimed is:
recess containing the small chamber or opening
1. In combination, a quick-acting circuit in
39 than to the end wall portion 43 constituting
terrupting switch having at least a iirst and ay
the top closure 'end for the annular recess. Sim
I3. In my invention, I preferably provide ‘for arresting the movement of the movable contact
means in the openings through which the mov
vable contact means operates. These openings
second pair of separable contacts, each of said'4
ilarly, thepost 26 in the recess 25 projects from
the end wall portion 44 thereof into said recess 20 pair including a stationary contact means and
a movable contact means, a base, a split insulat
to a point therein whereby the contacts separate
ing housing mounted on the base, said housing
in a, region which is closer to the 'opposite end
wall of the recess containing the small chamber
' having at least a first arc chamber for the iflrst\v
pair of contacts and a second arc chamber for
or opening 40 than to the end wall portion 44
constituting the upper closure end for the tan 25 the second pair of contacts, actuating mechanism mounted on the base for quickly operating the
nular recess. Inasmuch as the contacts. separate
movable contact means to effect a quick circuit
in a region relatively close to the small cham
interrupting movement, said split housing com
bers or openings, the actuating means may quick
prising an insulating support member and a
ly withdraw the movable contacts thereinto,
whereby the arc is readily extinguished. The so readily removable insulating body member
adapted to be detachably connected to the in
motion transmitting means i4 holds the movable
sulating support member, said insulating body
contact means relatively stable so that the mov
able contact means maybe adjusted bythe ad
member having at least a first recess constitut
justable nuts 49 to be further withdrawn from
the said openings. In order that the movable
contact means may restrict the openings in which
they operate when the contact means are fully
withdrawn, so that the small chamber will be
ing a portion oi’ the first arc chamber and a
second recess constituting' a portion of the second
arc chamber, said insulating body member also
having iirst and second openings connecting the
ilrst and second recesses respectively to the out
side of the split "housing, said movable contact
means and the said openings should be smaller 40 means for the first and second pair of contacts
being movable respectively in said openings upon
than the area of the opening. In other words,
the actuation- thereof by the actuating means,
the movement of the movable contact means is
said insulating members having mating Wan sur
arrested prior to a point where the area between
faces abutting against each other and .forming
the movable contact means and the said opening
_ formed, the area between the movable contact
45
removed from the gap between the end 56 of the '
the split between the said members, said mating
wall surfaces extending transversely of the _said
recesses, said stationary ~contact means for each
_pair having a iìrst end portion mounted to the
insulated support member and having a second
means i4 and the movable contact means carried
insulating support member into said recess re
equals the area oi the opening.
Y
In removing the insulating body member 23,
it is ñrst necessary that the motion transmitting
means id and the .movable contact means be
member 4'! and the contact tip members 33 of 50 end portion provided with a contact element,
the stationary contact means. To insure safety I said contact element and said movable contact ,
means for each pair having abutting contact
of operation, the removable insulating body mem
surfaces between which current is interrupted,
ber 23 cannot be removed in thev normal opera
the stationary contact means for said first pair
tive position of the motion transmitting means.
However, the motion transmitting means may 55 of contacts being disposed closer to said base than
the stationary contact means for said second pair
be readily removed by detaching the movable
of contacts, said second end portion for each
cross arm 4S from the member 41 by taking out
stationary contact means projecting from said
the screws 48. When the motion transmitting
thereby are removed then the removable insu 60 spectively and extending beyond said split,
whereby said second end portions and the con
lating body member 23 may be withdrawn or
tact elements provided thereon for said 'pairs of
« dropped downwardly into the gap between the
stationary contact means are readily accessible
end 56 of the member 4l and the contacttip
upon removal of the insulating body member,
members 33, as shown in Figure 4. The insulat
stop means to prevent the said movable con
v lating ‘body member 23
may then be removed 65 and
tact means from being withdrawn from said
laterally, whereupon the stationary contact means
openings in the insulated body member during
are readily accessible for inspection andreplace
the
circuit interrupting movement.
ment. Instead of using the screws 48, a suitable
2. In combination, a switch having stationary
hinge construction may interconnect the member
contact means and movable contact means, a
4l and the movable cross arm 46, whereby the
split housing having a iirst and a second cham
motion transmitting means I4 and the movable
ber for the contact means, said second chamber
_ contact means may be removed from the gap
being smaller than the ñrst chamber and com
by merely operating the hinge construction.
Ingmy invention, the springs 52 are disposed 75 prising an opening extending from the first
chamber to the outside of the housing, said split
`
‘
' '
'
_aerien
,
housing comprising an insulating support mem
ber and. a readily 'removable insulating body
member having an annular internal wall con»
stituting a portion of the first chamber, an
elongated element mounted on the insulated sup»
port member and having a projection portion ex
ì 4tending into said iirst chamber toward the sec
ond chamber, said projection portion supporting
'
3
for said contact means, said first chamber having
an internal annular wall portion, a ñrst end wall
portion and a second end wall portion, said
second chamber being smaller than the ñrst
chamber and comprising an opening extending
from the ñrst chamber through said second end
wall portion to the outside of the housing, an
‘ elongated element mounted on the said 'ñrst end
the stationary contact means upon the end
wall portion and having a projection portion ex
`tionary contact means and-the projection por
tion of the saidelongated element denning an
the stationary contact means upon the end there
into said liirst chamber toward the sec
thereof, said internal _annular wail of the nrst 10 tending
ond chamber, said projection portion supporting
' chamber and the external surface of the sta-=
of, said internal 'annular wall portion of the ñrst
chamber and the external. surface of the> sta
annularA recess extending from the stationary
tionary contact means and the projection portion v
15
contact means toward the insulating support
of the said elongated element defining an elon=
member and away from'the second chamber, ac
gated annular recess extending from the sta»
tuating means for initially 'separating the mov
able contact means from the stationary contact ' tionary contact means toward the nrst end wall
portion and away from the second chamber, ac
means in the first chamber, said actuating means
quickly withdrawing the movable contact means 20 tuating means for initially-separating the mov
able contact means from the stationary contact
into said second chamber, means for arresting
means in the ñrst chamber,> said actuating means
the movement of the movable contact means in
quickly withdrawing the movable contact means
the second chamber, whereby an arc drawn be
into said second chamber, and means for arrest
tween the contact means is conñned substantially
in said chambers, said insulating members having 25 ing the'movement of the movable contact means
mating wall surfaces abutting against each other v in the second chamber, whereby an arc drawn
between the contact means is conñned substan»
and forming the split ~between. said members, said
tially in said chambers, 'said projection vportion
mating wall surfaces extending transversely of
of the elongated element projecting from the
said iirst chamber, said projection portion ot‘ said
elongated element-projecting trom said insulat 30 said ñrst end wall portion into said ñrst cham
.loer to the point therein- whereby the contact
ing support member into said nrst chamber and
means separate in a region which is closer to
extending beyond said split, whereby said sta
said second end wall portion containing the
tionary contact means is readily accessible upon
second chamber than tothe ñrst' end wall por
removalof the insulating body member-'trom
35 tion constituting an end- for the said annular
the insulating support member.
recess.
'
3. in combination, a switch having stationary
contact means and movable contact means, a
housing-having a nrst and a second chamber
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