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Dec. 10, 1946.
. H. c. GRAVES, JR
Filed Aug. 25, 1942
5 Sheets-Sheet 1
?miezkr C’ ékqvzg Jet
Dec. 10, 1946.
Filed Aug. 25, 1942
5 Sheets-Sheet 3
6/5/9552?’ 6. 624mm, div.
Dec. 10, 1946.
Filed Aug. 25, 1942
5 Sheets-Sheet >4
3 75
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MWEAWT C’ den/£5,119.
Dec. 10, 1946.
Filed Aug. 25, 1942
5 Sheets-Sheet 5
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Patented Dec. 10, 1946
Herbert G. Graves, Jr., West Chester, Pa., assign
or to I. T. E. Circuit Breaker Company, Phila
delphia, Pa., a corporation of Pennsylvania
Application August 25, 1942, Serial No. 455,978
1 Claim.
My invention relates to circuit interrupters
and more particularly to a mounting means for
supporting the same upon a switch board in a
readily accessible and demountable manner.
The smaller types of circuit breakers are
usually fully enclosed in housings of phenolic
insulation which are so arranged as to cooper
(Cl. 287-20)
means for mounting a circuit interrupter upon a
panel board so that the removal of the circuit
interrupter will not in any way affect the elec
trical connections of the line and load terminals.
A still further object of my invention is to
provide a stud rigidly and non-rotatably sup
ported upon a panel to which the circuit breaker
ate with various types of mounting means for
may be mechanically and electrically connected.
securement on switch boards.
Another and primary object of my invention
Such frames or casings of phenolic material 10 is the formation of a mounting stud having ad
are rather stiff and in?exible and cannot ordi
justable members which will permit the stud to
narily be manufactured to minutely accurate
accommodate itself to planar variations in the
dimensions. It often occurs therefore that the
molding of the circuit breaker housing or to any
rear face of the molding which rests against
misalignment of the openings therein.
the panel of the switch board or which is sup 15
Still another and corollary object of my in
ported by the various mounting means within
vention is the formation of a mounting stud for
the switch board is not a perfect plane.
a circuit breaker in such a manner that the
effective length of the stud for securing purposes
Owing to the nature of the material, the open
ings in the moldings for the passage of mounting
may be varied by the insertion or replacement
studs are not necessarily always in perfect align 20 of adjusting members.
ment. Accordingly, the tightening of all sup
These and other objects of my invention will
‘now be apparent in the following speci?cation
porting members when such a circuit breaker is
and drawings, in which:
mounted in the switch board may at times apply
stresses to the molding which may tend to de
Figure 1 is a side View of a circuit breaker and
form or break the same and thus interfere with 25 supporting panel showing two species of circuit
the proper function of the interrupter.
breaker mounting means in section.
My invention provides special mounting means
Figure 2 is an end sectional view of the
which may readily be adjusted to securely posi
multipole circuit breaker illustrated in Figure 1
tion a circuit interrupter in such a casing on a
taken along the line 2-2 and showing the two
different species of Figure 1.
frame without applying such bending or de
forming stresses thereto where any misalign
Figure 3 is an exploded view in perspective of
ment or irregularity occurs.
the circuit breaker mounting means.
My invention also contemplates the forma
Figure 4 is a fragmentary cross sectional view
tion of a mounting stud and the arrangement
of a modi?cation of the two circuit breaker
mounting means shown in Figure 2.
thereof in such a manner that all of the parts
Figure 5 is an exploded perspective view of the
thereof that must be manipulated to secure and
apparatus illustrated at the left in Figure 4.
detach the circuit breaker on the panel will be
accessible from the front.
Figure 6 is a cross-sectional view correspond
ing to that of Figure 4 but showing a slightly
Accordingly, it is an object of my invention
different form of mounting means.
to provide novel means for mounting a circuit
interrupter upon a switch board or panel which 40
Figure '7 is an exploded view in perspective
permits the removal of the circuit breaker for
view of the mounting stud shown at the left in
inspection or repair without requiring access to
Figure 6 showing a construction wherein an
the circuit connections at the rear of the panel.
additional ?oating element is provided which
Another object of my invention is to provide 45 serves to prevent rotation of the stud.
mounting means for a circuit interrupter which,
Figure 8 is a cross-sectional view correspond
in addition, serve as the electrical conductors for
ing to those of Figures 4 and 6 showing, however,
connecting the circuit breaker terminals to the
a slightly modi?ed stud.
power and load terminals.
Figure 9 is an exploded view in perspective
Another object of my invention is to provide 60 showing the modi?ed mounting stud to the left
circuit breaker mounting means comprising a
'end in Figure 8.
plurality of studs having the load or line con
Figure 10 is a cross-sectional view correspond
nections thereon and which are rigidly mounted
ing to those of Figures 4 and 6 showing, however,
upon a panel.
a slightly modi?ed mounting means.
A further object of my invention is to provide
Figure 11 is an exploded view in perspective
of the mounting stud shown at the left in Fig
the electrical circuit interrupter illustrated in
ure 10 showing a construction wherein an addi
Figures 1 and 2 is provided with a pair of ter
minals 26 and ‘21 which are electrically connected
to the conductors 5i and 32 of the power and load
tional ?oating element is provided which serves
to prevent rotation of the stud.
Figure 12 is a cross-sectional view corre
sponding to those of Figures 4 and 6 showing,
however, a slightly modi?ed mounting means.
Figure 13 is an exploded view in perspective of
the mounting stud shown at the left in Figure 12,
Thus a single pole of the circuit breaker is ar
ranged to electrically connect terminals 23-21
when its operating contacts are in the closed
The electrical connection between the ter
minals 25 and 2? and their respective bus bars 3|
and 32 is made through studs 33 and 34 which
in addition serve to provide the necessary me
sponding to those of Figures 4 and 6 showing,
chanical support for the circuit interrupter.
however, a slightly modi?ed stud.
15 Thus, as will be described, the studs 33 and 34 are
Figure 15 is an exploded view in perspective
non-rotatably positioned upon the insulating
showing a construction wherein an additional 10
?oating element is provided which serves to pre
vent rotation of the stud.
Figure 14 is a cross-sectional view corre
of the mounting stud shown at the left in Figure '
14 showing a construction wherein an additional
panels 2! or 2211 and Zib and are spaced so that
tion of the stud.
36 thereupon. The milling of these flat surfaces
the‘ circuit interrupters may be positioned thereon
?oating element is provided which serves to pre
as illustrated and so that electrical contact be
vent rotation of the stud.
20 tween the line terminals 26 and 2? may be es- .
Figure 16_ is a cross-sectional view correspond
tablished therewith.
The various components of a single stud con
ing 'to those of Figures 4 and 6 showing, however,
a slightly modi?ed stud,
nection are best illustrated in Figure 3 which has
Figure l’? isan exploded view in perspective of
been exploded to show the necessary relation
the mounting stud shown in Figure 16 showing
ships. Thus the stud connection 33 of Figure 1
comprises essentially a metallic cylindrical mem
a construction wherein an additional ?oating ele
ment is provided which serves to prevent rota
ber 35 which is milled to form the ?at surfaces
Figure 18 is a cross sectional view correspond
ing to the upper left hand stud assembly of Fig
ure 1, but showing the use of a floating metal
A typical panel board arrangement for small
manually operable circuit breakers is illustrated
forms a shoulder 31 on each side of the stud.
‘The section ill of the cylindrical member has
been reduced in diameter and threaded up to the
shoulder I32 formed by this reduced diameter sec
tion. At the opposite end of the cylindrical
member, a reduced diameter section 43 is thread
in Figures 1 and 2 and comprises essentially a
ed and provides a shoulder Kill. As illustrated in circuit breaker base I I which contains the opera
Figures 1 and 2, when the circuit interrupter is
tive members of the circuit breaker mechanism
mounted upon the studs, the reduced diameter
and an enclosing cover it’ which is secured
threaded section "53 extends through the body of
against the base H to form the completed unit,
phenolic insulation '35 and through a metallic in
The circuit breaker illustrated is a multi-pole 40 sert 45 which has been molded into the main body
unit the number of poles being dependent upon
of the circuit breaker.
the particular application. This circuit breaker
The section 43 also extends through a per
forms no part of the present invention and may,
foration ill in the line terminal 25 and good elec
of course, comprise any unit which may . be
trical and mechanical contact is secured at the
mounted upon the means to be described. The 4-5 line terminal by tightening nut 5! against the
circuit breaker illustrated is contained within the
line terminal and looking it by the use of a second
body members I i and !2 of phenolic insulation
(see also Figure 3).
or the like.
The metallic insert 46 (Figures 1 and 2) ex
A panel l3 provides the front face of the switch
tends beyond the phenolic insulation into which
board and is perforated-at Hi to permit the man 50 it is embedded and accordingly the shoulder M
ual operating lever l5-to extend through. Any
bears against one surface of the metallic insert
number of circuit breakers may of course be
and the line terminal 28 bears against the oppo
mounted beside each other to form the required
site surface. Hence the tightening of the nuts
panel board.
5! and 52 will impose stresses which are carried
As illustrated in Figure'2, the panel board is 55 entirely by the metallic member £25 and impose
built up between the two side panels l6 and I?
no material forces upon the weaker phenolic in
which are maintained in spaced relation by a
sulation of the circuit breaker body.
' plurality of insulating plates 25 secured to the
The member 45 is provided with a circular rib
rear ?anges thereof, by a suitable number of bolts
lit’ which precludes relative motion between the
22 which pass through perforations in the chan 60 metallic insert and its associated framework of
nel flanges and in the insulating panels, and are
secured by nuts 23.
The stud 33 is rigidly and non-rotatably sup
As'illustrated in Figure 1, the rear bracing of I
ported upon the insulating panel 2i within a per
insulation need not necessarily comprise a sin
foration 53 (see particularly Figure 3) which has
gle insulating panel but may comprise two
counterbored at 54 at one end and 55 at the
smaller panels Zia and 2!?) which extend along
the outer edges of the circuit breaker. The front
panel of the switch board is as illustrated a metal
other end thereof,
The internal angular ?ange 56 thus formed
between the counterbores 54 and 55 ‘has been
drilled through at 51 and GI. In the mounting
of the stud upon the panel 2i a washer 62 is first
slipped over the cylindrical threaded portion iii.
This washer 62 has a central opening 763 which
and in the flange. of the channels It and l‘! and
corresponds with the cross-section of the milled
engage in nuts 25 whichare secured as by weld- .
ing to the ?anges of the channels. Each pole of 75 portion of the stud and accordingly the washer
sheet 1 3, ?anged at the ends to provide additional
rigidity and secured to the ?anges of the chan
nels it and H by suitable bolts 25.
These bolts pass through holes in the panel l3
62 may be non-rotatably positioned against the
shoulder 31.
tion of the circuit breaker or crack the phenolic
casing thereof.
A second washer 64 having a central opening
65 corresponding to the opening 63 in washer
62 is also slipped over the threaded end 1H and
movement of one or more of the studs with re
positioned upon the ?ats 35 against washer 62.
The washer 64 is preferably a stamping which
contains a pair of oppositely disposed extensions
ing clamping stresses may not be imposed upon
the circuit breaker body. As an example, the
stud 34 of Figure 1 and the stud 8| of Figure 2
My mounting means therefore permits axial
spect to panel 2| in order that uneven or distort
66 which are positioned to engage in the perfora
have been shown with this type of connection.
tions 51 and 8| in the ?ange 55 in the insulating 10
In each of these illustrations, the washers 62
plate 2|.
and El have been omitted and a bushing 82 hav
Accordingly, when the cylindrical stud 33 is
ing an outside diameter equal to that of the
?tted with the washers 53 and 64 and passed
cylindrical portion 35 has been placed between
through the perforation 53 so that the extensions
the nut ‘H and the shoulder 42 of the cylindrical
66 enter into their corresponding perforations, 15 portion 35. Otherwise the elements of the stud
it may be seen that rotation of the stud will be
connection remain the same as illustrated in
impossible. The stud is then ?xed to the panel
Figure 3.
2| by slipping a washer 67 over the threaded end
4| so that it bears against the inner annular sur
face of ?ange 56 within counterbore 55 as illus
trated in Figures 1 and 2 and the nut 1| is tight
The axial length of the bushing 82 is sufficient
so that its outer annular surface extends beyond
20 the surface of the annular ?ange 55 within the
counterbore 55. Hence it may be seen that when
ened against the washer 61.
the nut ‘H is tightened, it is brought to bear
against the bushing 82 which accordingly is
It may be seen from Figures 1 and 2 that the
axial length of the milled ?ats 36 is somewhat
less than the sum of the thicknesses of the wash
ers 62 and 6:3 and of the annular internal rib
or flange 55 of the insulating plate 2|.
Accordingly, as may be seen from Figures 1 and
forced against the shoulder 42. Hence there is
no clamping action against the insulating panel
2, when the nut ‘H is tightened against washer
61, the washer will bear against the annular I
?ange 56 within the counterbore 55 and the
washer 64 will bear against the opposite surface
of the ?ange 56 within the counterbore 5a. This
engagement is then locked by the use of a lock
nut 12.
Accordingly, when this assembly is complete,
Accordingly, this construction permits the
the stud 33 is rigidly and non-rotatably sup
ported upon the insulating panel 2|.
The bus bar 3| may be connected to the thread
ed extension 4| of the stud by first positioning 1
a nut 13 upon the stud as illustrated in Figures
1 and 2, and passing the bus bar 3| over the stud
through perforation ‘i4 and locking the bus bar
by means of a second nut ‘l5.
The tightening of nut 15 will provide good elec
trical contact between the bus bar and the stud.
Since the stud is non-rotatably supported with
in the panel 2| it may be seen that the operations
accompanying the removal of nuts 52 and 5| will
2| as a result of the tightening of the nut ‘H and
since, as illustrated in Figures 1 and 2, there is
a clearance between the nut ‘H and the surface
of the ?ange 56 or between the washer 64 and
the shoulder 3'! or between both these sets of
elements, depending upon the position of the
stud axial movement of the stud is possible.
But since the extensions 55 of the washer 54
are longer than the clearance provided for this
washer, no rotation of the stud is possible.
clamping of the line terminal such as 21 to the
stud 34 since as previously mentioned the clamp
ing of the line terminal does not impose any
stress upon the body of phenolic insulation.
A modi?cation of my circuit breaker mounting
is shown in Figures 4 and. 5 for mounting a cir
cuit breaker on a metallic panel.
It is, of course, necessary when utilizing steel
‘ panels at the rear of a circuit interrupter to en
sure that each of the studs which provides elec
trical and mechanical supporting means are in
sulated from the steel panel in order that the
individual circuits may be isolated.
in no way tend to loosen the nuts 13 and 15.
Referring to Figures 4 and 5, a portion of the
It therefore becomes possible to remove the cir
circuit breaker terminal is illustrated and in
cuit breaker from its mounted position illus
cludes the insulating body H and the line ter
minal 3|. The stud 85 comprises in this modi
trated in Figures 1 and 2 by ?rst removing the
?cation a circular ?ange 26 having on one side
front metallic panel l3 and employing a socket
wrench to remove the nuts 52 and 5|.
‘Similarly, the breaker may be replaced by sim
ply slipping the openings in metallic insets AS
55 thereof an integral threaded extension 9| of re—
duced diameter. At the other side of the flange
an integral reduced diameter section 92 is
knurled up to the edge 53 and threaded at 94 to
thereof over the threaded extensions 43 of the
the end of the studs. The stud 85 contains a
stud and securing the nuts 5| and 52. This op
cylindrical layer of insulation 95 molded directly
eration will again have no effect upon the elec
thereupon, the knurling providing a rigid bond
trical connections of the bus bar 3| since the
between insulation and metal.
stud is non-rotatably supported.
The insulation is milled to provide a pair of
As previously mentioned, it is quite possible
opposed ?ats 95 extending from the main cylin
that commercial phenolic moldings such as that
drical section 95.
employed upon the circuit breaker illustrated,
The insulation terminates in the shoulder 83.
may not have perfectly true surfaces. It has
As illustrated in Figure 4, the circuit breaker
been found advisable, particularly in three-pole
circuit interrupters to secure the base against
the panel board in certain positions, that is, at
certain stud locations and to prevent any clamp
ing stress being imposed at other stud locations
since it has been found that tight clamping at
all stud locations would cause a warp in the mold
ing which in turn would preclude proper opera
is connected to the stud in a manner similar to
that in Figures 1 and 2. Thus the threaded ex
tension 9| of the stud extends through a metallic
insert 45 and a pair of nuts 5! and 552 secure it
to the circuit breaker terminal 25. At the other
end, the nut ‘H and lock nut 12 complete the
mounting on the panel, and nuts 13 and 15 secure
75 it to the bus 3|.
' A washer‘ 9"! having a perforation .Ill'II corre
washer I64a which registers with the washer
sponding with the cross-section .ofthe. milled
portion 96 of the. insulation is slipped over the
milled insulating material to engage against the
shoulder m2 and a washer m3 similar to washer
54 of Figure 3 and having a perforation I?él
I641). Otherwise the manner of arranging and
mounting of the stud is essentially the same as
similar to that in washer MI is also slipped over
the insulating material and brought to bear
. against the surface of washer Sell.
was previously described.
Thus the stud itself comprises a cylindrical
metallic member 135 having an area milled there
on to' form flats its on either side which termi
nate in the shoulders 53?. The front end of the
stud has extending therefrom the threaded mem
The insulating panel 2'! has been replaced in 10 ber I43 which in cooperation with the cylindrical
this modi?cation by the steel panel i555 which is
member £35 forms the shoulder I44.
perforated at Iilli to permit the passage of the
Shoulder IM bears against the inner end of
stud; and a pair of opposite perforations It? are
the metallic insert Hi6 and the line terminal I26
employed to engage the extensions l I i on washer
is mounted over the threaded end I43 by passing
15 the perforation I27 thereof over the said threaded
Thus when the stud 85 is passed through the
end. The line terminal is forced against the
perforation I85 with the washers S1 and H33
outer end of the metallic insert I136 by the nut
properly positioned upon the insulating layer 95,
I5I which in turn is held securely in place by the
it will be seen that the metallic panel Hi5 may
‘not contact the metallic portions of the stud
When H2
the ofstud
an insulating
has been material
is slip e"
over the stud.
lock nut I52.
At the opposite end, a threaded element MI
extends inwardly towards the rear from the cy—
lindrical portion I35 of the stud.
The opening
A washer H3 is then positioned
I75 in the bus bar terminal i3! is placed over
against the insulating bushing H2 and the nut
the threaded end iLlI against the nut 213 which
"II is employed to tighten these elements. A look
is threaded onto the end It! and the terminal
nut 12 when positioned completes the assembly
is locked in place by the lock nut I75.
thereof. The nuts El and ‘i2 cooperating with
A washer E62 surrounds the back end of the
washer. I I3 press the bushing I 52 against the me—
stud and has an opening I63 therein which is so
tallic panel N35 and pull the stud
so that the
shaped as to closely coincide with the flats I35
entire unit is held securely to the panel ltd. 30 oi the milled section of the stud. This washer
The flat sides 96 of the insulation
the flat
is drawn against the shoulders I3’! at the for
sides of the perforation let in the washer i3’
ward end of the flats I36.
prevent the stud as from rotating relative to the
The second washer IBZla also has a central
steel panel.
opening £55m which is similarly formed so as to
Accordingly, it may be seen that this has all
closely coincide with the periphery of the milled
the advantages described in connection with the
modi?cations illustrated in Figures 1, 2 and 3
and has the additional advantage that a steel
panel may be employee. Also as in the previous
modification, axial movement may (as seen at
the right hand stud 85a of Figure 1i) be per
mitted in certain of these studs by omitting the
washer 87 and using a shorter bushing H2 and
permitting the washer M3 to be pulled tightly
end of the stud. This washer is drawn back
tightly against the washer 262 in the operative
position of the mounting so that it also embraces
the ?ats I35.
The washer Hello is provided with a pair of
horizontal extensions i584; which enter into and
cooperate with the slots I53 in the third washer
IEQh. The extensions 166a are of a length slight
ly less than the thickness of the washer its?) so
stud. Also, the tightening of nuts ll, 12 cannot
that they do not pass through the opposite side
of the washer.
The third Washer 565?) also has a central open?
ing iiiz'ih which is also so shaped as to closely
place a strain upon the circuit breaker base or
coincide with the flats IS‘t‘ of the stud. In oper
against the shoulder 53 of the insulation 95. .
This will provide an axial freedom of movement
while precluding any rotational movement of the
the supporting steel panel Hill.
50 ativ position, this washer is drawn back tightly
The insulation around the stud 85 precludes
against the washer lt‘da upon the milled portion
possible short circuits between poles of the cir
of the stud.
cuit interrupter. Thus it may be seen that in
it will be clearly seen in Figure 7 that the slots
either of the modi?cations described, the circuit
are adapted to receive the extensions It?a- on
interrupters are readily removed by loosening the 55 washer idea. This is only for simplicity in man
nuts SI and
which operation does not disturb
ufacture, the only function of the slots I68 being
the electrical connections at the rear of the stud
to receive the extensions Idea. ?le third washer
and behind the panel.
iii/lib is also provided‘with a pair of horizontal
Similarly the insertion of a circuit breaker may
extensions 55611. The two extensions I666 on op
be accomplished without impairing the electrical 60 posite sides of the washer Itilb are arranged in a
connections and without requiring that a service
plane which is normal to the plane of the two
man go behind the panel. If an insulated socket
extensions iiilia of washer I'lida.
wrench is employed, the circuit breakers may be
The extensions lliiib will enter into and coop
removed when the main conductors are energized
erate with the slots it! and I5‘! in the inner
since the circuit breaker may be handled at its 65 ?ange ib‘? formed by the counterbore I515 in the
outermost portions during removal.
opening I53 of the frame member I2I. The for
In Figure 6, I have shown a construction which
mation of the opening 153 and the counterbore'
corresponds somewhat to that of Figures 1 and
55s in the plate l2l of Figure? is substantially
2 wherein the stud members which in turn sup
similar to the formation of the opening 53 and
port the circuit breaker are mounted on the 70 the counterbore 5&- in the plate ZI of Figure 3.
plurality of switch board panels I2 l.
The essential difference between these two open
The stud itself is shown in an exploded view
ings is that while the openings 51 and 6| in’the
in Figure 7. The essential difference between the
plate 2| of Figure 3 are designed to closely ?t
mounting arrangement of Figure '7 and that of
around the extensions 66 of the washer Gathere
Figure 3 lies in the additional non-rotatable 75 in, ‘the slots .ISi and I51 are arranged to provide
a loose ?t for the extensions I661) of the washer
IBLib of Figure 7.
Thus the arrangement of the washer Iiillb on
the milled flats I36 of the stud and the engage
.ient of its extensions 1155b in the slots I51 and
Hit or the frame member I2I will prevent rotation
I55 formed .by the counterbore I54. The lock
ing pressure is then transmitted through the
washer 165b, ISM and IE2 to‘ the shoulders I37
formed in the stud by the milling of the ?ats I36.
The circuit breaker may thus readily be se
cured in position. It is also clear that in order
of the stud. The essential purpose of the mod
to remove the circuit breaker from the panel, it
i?ed construction of the stud of Figure '7 over
is only ‘necessary to loosen the nuts I52 and I5I
that of Figure 3 to‘iprovide not only a free ?oat
with respect to. each of the mounting studs; and
ing condition at the center poles-of the circuit 10 likewise to replace the circuit‘ breaker, it is=nec
breaker, but also tov ‘permit some freedomof
essary only to mount the openings therein over
movement- of the studs 'in two perpendicular
the threaded ends I43 of the respective studs and
planes, thus assuring adequate adjustment of any
place the locking nuts I El and I52 thereon. ' Since,
misalignment of poles in the panel on which the
as before pointed out, the circuit breaker casings
circuit breaker is to be mounted.
of phenolic material or similar commercial ma
‘ .Thus, by maln'ng the slots I51 and HSI over
terial do not in most ‘cases have'their surfaces
size so that they are much larger than the ex
particularly true. it is necessary, particularly in
tensions I681), the washer I547) may have some
three pole circuit breakers, rigidly to hold the
freedom of movement within the counterbore
base in positien at certain stud locations and'to
i516. For this purpose, it is, of course, essential 20 prevent a clamping action at other stud locations.
that the diameter of the washer I641)‘ be some
This type of free ?oating condition has already
what less than that of- the counterbore I54.
been described
connection with Figures 1 and
Likewise, by making the slots I68 in washer
mitted by the slight enlargement of the slots I51,
a for the particular studs therein illustrated.
Similarly, provision may be made for a float
ing mounting of the stud in connection with the
studs herein set forth in Figures 6 and '7. It
should be noted that while it is important to
prevent clamping action at certain stud locations
to prevent breakage or distortion of the'circuit
breaker‘ casing, nevertheless even the ?oating
studs which are used for this purpose must be
in position to furnish some support for the cir
16! and H58.
cuit breaker casing at that particular location.’
ltd’o somewhat over-size so that they are larger
than the cross-section of extensions I??a of
washer iiida, this washer may have some free
dom of movement with respect to the washer i642).
Since both washers isr‘l-a and I‘Mb closely en~
gage the
I35 of the stud, any movement of
the stud which is necessary to compensate for
misalignment of the mounting holes will be per
The washer 569 is positioned on the threaded
In Figure 6, on the right hand side, I have
end Ilii of? the stud in back of the washer I841).
shown the arrangement of the stud of Figure 7
Thiswasher has an inner bore Iii! adapted to ?t
to provide for the free floating condition‘ which
over the said threaded extension. The outside
at times becomes necessary‘. Here it'will'beseen
diameter of the washer I68 is greater than the
that the washer i522 has been removed and a
diameter of the central bore I53 in the plate I2 I.
bushing I82 having an inner bore free to pass
However, it is of such diameter that it will ?t 40 over the threaded section Il-ll of the stud and
easily between the extensions I??b of the washer
an outside diameter which is less than that of
the bore £53 has been placed over the end MI
The length of the ?ats 335 is slightly less than
between the washers i5‘! and IE9. The length of
the total thickness of the washers I62, “Ma and
the bushing Hi2 is such that when the nuts Ill
itdb. The washer 2‘59 will therefore provide a
and H2 are tightened, the washer I61 will not
able bearing between the back face of washer ‘ bear against the back-of the plate‘ IZI and the
I?db and the surface of the ?ange I56 in the
force will be directed to'the shoulder I31 of the
counterbore 554. It will also provide a suitable
stud through the ‘washer l 59, thus preventing'any
bearing for the end of the bushing hereinafter
ciamping action. In this way,»a stud is provided
described when washer IE2 is removed.
which is free to move axially while-at the same
The relationship of all of the elements thus
time the extensions Iii?b and i??a of the washers
far described to the circuit breaker and its panel
l?fia and i‘dfib prevent rotation of the stud.
is clearly shown in the left hand stud of Figure 6.
Y The degree of axial movement which may be
In order to secure the stud assembly in the posi
permitted for the stud when the bushing I32 is
tionhereinbefore described‘, the washer lb? hav
ing an ‘inner bore adapting it to ?t over the
threaded end I til of the stud is slipped over the
end of the stud and is placed against the’ back
surface of the plate I 2!.
Obviously, the washer It‘! has a diameter sub—
stantially equal to that of the washer I69 and
thus is of a greater diameter than the bore I53
so that it will furnish an appropriate bearing
surface against the back of the plate IZI.
Nut ITI is then threaded over the end of the
stud MI against the washer I51 to lock the same
in place is determined primarilyby thelength
of the bushing. However, the limiting‘ factor is
that the degree ofgaxial movement should not
be so great as to cause a disengagement of the
extensions I66?) from the slots i5‘! and IBI. By
this means,‘ a construction is provided wherein
not only axial movement ofv a‘stud can be per
mitted by utilization of the bushing I82, but also
it is possible whether‘ or not the axial movement‘
is to be permitted, nevertheless to obtain a slight
movement in perpendicular. planes which are
normal to the axis ‘of the stud so that the stud
may ‘readily adjust itself should the mounting
holes in the switch 'board‘ panel and the circuit
breaker be‘ to some slight degree misaligned.
‘Again, the‘ convenience in use‘and operation
ready been described.
' Y 3-‘ 70
of the stud is'preser'ved since‘ the circuit‘ breaker
When the stud is in'place, it will be seen that a
may be removed from or placed on the panel
clamping action against the plate I2I is provided
by the washers it‘! and I69. Washer it? bears
without requiring access to the rear circuit con
‘ hections.
against the back surface of the plate I2I; Washer
169 bears against the front surface of the ?ange
~ I'Iri Figures sand 9,-'I have‘shown a modi?ca
in place and this securement is further locked
by the lock nut I 72. The nuts i113 and I15 which
secure the bus bar terminal ill! in place’have al
tion of my stud wherein the supporting panels
or bars 22! may‘ be of conducting material
which thus permits the utilization of structurally
strong members such as steel.
Here again, the
sembledfor operation and the stud has entered
into the opening 253 of the panel 22!.
An additional washer 266 having the square
central opening 216 corresponding in size to
the opening 265 in washer 264 also is ?tted over
the stud with the opening 2'16 closely ?tting over
the squared section 2I5 and the face of the
washer 269 bearing against the back face of the
washer 264. As may readily be seen from Figure
circuit connections. and the securing connections
obtained by the nuts at each of’ the outer ends 10 8, when the parts are assembled for operation,
an insulating, sleeve 262' surrounds that portion
of the stud are attained in the same manner as
of the insulated section 2|3 of the stud which
was described; in connection with the studs of
projects through the rear side of the metal panel
the prior ?gures so that these require no further
A washer 26'! and a pair of nuts 21! and 272
Where a steel mounting panel is used for a v.
press this sleeve against the back of the panel
load bearing and current carrying stud, it be
22! and pull the ?ange 2l6 of the insulating
comes essential, of course, that a safe creepage
sleeve of the stud tightly against the washers
distance be maintained. ‘This is accomplished
264 and 266 and hence pull these members tight
by use of an insulated stud and bushing. Re
ferring ?rst to Figure 9, there is here shown a 20 ly' against the front of the panel 22! to hold the
unit securely in the said panel. The coopera
metallic stud 206 having a cylindrical ?ange 235.
tion of the squared opening of washer 264 with
The front end of the stud 260 has a threaded
the squared portion 2l5 of the stud and the en
extension 243 which, with the cylindrical ?ange
gagement of the extensions 266 of the washer
235, forms the shoulder 244. The’ shoulder 244
264 in the openings 25'! and 26! of the panel
when the stud is in place, bears against the in
prevent the stud from rotating relative to the
ner surface of the metallic insert 246 in the
manner already described while the threaded end
The length of squared section 2H5 is such that
243 passes through this metallic insert and
it does not abut against panel 22!. The length
through the, opening 22‘! in the terminal 226.
The circuit breaker is then securely held in place ~ of section 2! 5 is less than the summation of
washers 264 and 269.
on the stud by the nut‘ 25! and the lock nut 252.
As previously pointed out, the opening 214 of
This has already been described in connection
bus bar terminal 2'3! is ?tted over the threaded
with similar reference numbers in the prior
end 24! of the stud 266 and is securely held in
The rear end of the stud 206 likewise has an 35 place by the nuts 213 and 215. The position of
the stud 266 for a tight clamping action is shown
extension 24! which is threaded at its outer end
on the left hand side of Figure 8. Where it is
but which, however, is knurled as seen particu
necessary to permit axial movement of the stud
larly‘ in the left hand stud of Figure 8 adjacent
owing to distortion or lack of trueness of the
the cylindrical ?ange 235. This knurling is pro
vided in order to maintain a secure bond be 40 casing of the circuit breaker, then the modi?~
cation shown on the right hand side of Figure
tween the metallic portion of the stud 200 and
8 may be made in the mounting of the stud.
the insulating sleeve 283 which is molded thereon.
For this purpose, the washer 269 is omitted
' The insulating sleeve 283 includes a cylin
and a shorter insulating sleeve 28211 is used in
drical ?ange 2!!) having on the front surface the
stead of the bushing 282. This permits the
face or shoulder 2’! I. The insulating sleeve also
washer 26'! to be pulled tightly against the shoul
includes on the rear side of the ?ange 2!!! a sec
der 2!‘! on the back surface of the insulation.
tion 2!3 having a diameter equal to the diameter
Since the insulating sleeve 282a, is sufficiently
of the metallic ?ange 235. The sleeve itself,
short so that when the washer 26'! is pulled
between the ?ange 210 and the ?ange 235, is of
the same diameter as ?ange 235. Between the 50 tightly against the shoulder 2!? it does not press
the sleeve 282a against the panel 22!, the right
section 213 of' the sleeve 283 and the ?ange 2!!!
. hand stud of Figure 8 is permitted to have axial
thereof, I provide a squared section 2I5 which
movement. The length of sleeve 282a is such,
is thus on. the rearward side of the ?ange‘ am.
however, as not to permit su?icient axial move
As may readily be seen from an inspection of
ment of the right hand stud of Figure 8 to cause
Figures 8' and 9, the section 2!3 of' the insulating ' the extensions 266 to be entirely withdrawn from
sleeve 283 terminates substantially short of the
the openings 25'! and 26!.
end of the threaded extension 24! to form the
Thus, while the stud is permitted some axial
shoulder 2 I1.
movement, the axial movement is not sufficient
The insulating sleeve 283 which is integrated
to permit a disengagement of the members
with stud200 by reason of its being molded
which prevent it from rotating. In this modi
around the knurled portion thereof, may be made
?cation, as well, it will be clear that the circuit
breaker may readily be mounted on or removed
of a diameter which is‘ determined by the. amount
of voltage used. More speci?cally, the position
from the panel simply by manipulation of the
ing and diameter of the insulating ?ange 210 65 nuts 25! and 252 of each of the studs.
will govern the creepage distance. I
Referring now to Figures 10 and 11, I have here
A. Washer‘ 264: having'the. square ‘central open.
shown a slightly modi?ed form of stud which,
ing 2.65.v surrounds the insulated stud, the said
however, does not depend upon utilization of hor
squared opening being made to ?t closely on the
izontal extensions to prevent rotation, but uti
squared section 215. In. operative'position, this
lizes a formation of the opening in the insulating
washer will- press against the back face of. the
supporting panel to obtain the same.
?ange z-m. Washer 254 is provided withv a pair '
Here referring particularly to Figure 11, the
of horizontal extensions 266 which normally will
stud 366 has a cylindrical section 335 which is
enter into and engage the holes 25'! and 26! in
straddle-milled to form the ?ats 336. The junc
the supporting plate 22‘! when the: parts. are as 75 ture of the. ?ats 336 with the main body- of the
circuit breaker casing has exactly the same form
as the circuit breaker casings of Figures 1, 2, 4
and: 6, so that the arrangement of these members
need not be further described. Similarly, the
cylindrical section 335 forms the shoulders 331,
The rearward end of the stud at the ends of the
?ats 336 has extending therefrom a threaded eX
tension 34f. The junction between the threaded
extension and the milled end of the cylindrical
extension 335 forms the shoulder 3!1. The front
end of the cylindrical section 335 has extending
therefrom a threaded end 343 forming at its junc
tion with the cylindrical section the shoulders
The circuit breaker shown in Figure 10 has ex
actly the same construction as that shown in the
to have axial movement does not prevent the se
cure mounting of the circuit breaker upon the
The tight clamping action which is obtained by
the three or four studs which can be tightened
ensures absolute securement of the circuit break
er on the panel. The one, two or three remain
ing studs which must of necessity be permitted
axial movement nevertheless serve to position the
circuit breaker with respect to the particular
openings through which they pass.
Again it will be obvious that the circuit breaker
prior figures. Thus the shoulder 344 of the stud
may be removed from or placed on the panel sim
bears against the inner surface of the metallic in
ply by manipulation of the nuts 35% and 352.
sert 346 while the threaded end 343 passes there 15
In Figures 12 and 13, I have shown a slight
through and also passes through the opening
modi?cation of the construction of Figures 10
v321 in the line terminal 326 and is securely held
and 11 where again a supporting panel 42! of
in place by the nuts 35! and 352. The opening
insulating material is used. Here instead of the
353 in the insulating supporting panel 132! has
broached opening 353 of Figure
an opening
a shape corresponding exactly with the milled 20 453 is provided in the panel. This opening is
portion of the stud 330 so that the flats 335 there
backed up by a plate 480 preferably of insulating
of enter thereinto and are closely engaged by the
material which is secured against the back sur
inner surfaces thereof to prevent rotation of the
face of the panel 42! in any suitable manner, as,
stud 30!].
for instance, by the self-tapping screws 48!, 48!.
The spacing washers 369 and 361 here have
The insulating plate 480 has an opening 482
central openings 31!] adapting them to ?t over
therein which registers exactly‘ with the opening
the milled portion of the stud. This is necessary
453. The opening 482 is substantially equal in
since they are intended to pass over that portion
its vertical diameter to the diameter of the open
of the stud which is milled. They do not, how
ing 453 but the sides of the opening 482 are ?at
ever, cooperate in any special way in preventing
and extend substantially over the opening 453 in
rotation of the stud, the prevention of rotation
order to provide a suitable rotation preventing
being obtained by the shaping of the opening 353
opening to engage the milled portion of the stud.
to closely engage the milled portion of the stud.
The stud 4343 consists of a cylindrical member
The stud is tightly positioned in place by the
435 which is turned and threaded at the front end
nuts 31! and 312 in the manner previously de
443, thus forming the shoulder 444. The cylin»
scribed and the bus bar terminal 33! is held in
drical member 435 is also turned and threaded at
place over the threaded end 34! of the stud by the
the rear end 44! to form the shoulder 4H and is
nuts 313 and 315. Here it will readily be seen
also straddle milled to form the ?ats 436 com
that when the stud is held in place in the manner
municating with the shoulders 431. Here again
shown at the left hand side of Figure 10, it can
the shoulder 444 bears against the inner end of
have no axial movement and at the same time it
the metallic insert 443 in the circuit breaker and
is prevented from rotational movement by en
the threaded end 443 passes therethrough and
gagement of the milled portion thereof in the
also through the opening 421 in the line terminal
squared hole 353 of the insulating supporting
426 where it is secured by the nuts 45! and 452.
panel 32!.
The cylindrical portion 435 of the stud 400 is of
Should it, however, become necessary to pro
a diameter which permits it to pass through the
vide for axial movement of the stud for pur
opening 453 in the panel 42!. The milled por
poses hereinbefore pointed out, then removal of
tion thereof passes through the opening 482 in
the spacing washers 361 and 369 accomplish this
the plate 48!] so that the ?ats 435 thereof are en
result. When, as shown at the right hand side
gaged by the sides of the opening 482, thus pre
of Figure 10, the washers 361 and 369 are re
venting rotation of the stud.
moved. then the washer 31! may be tightened
A spacing washer 461 having an opening 410
directly against the shoulder 3!1 on the stud so
permitting it to pass over the milled portion of
that clamping action of the stud members
the stud is then placed over the portion of the
against the panel 32! is prevented and the stud
stud projecting beyond the plate 480 and the en
is permitted to have an axial movement to a de
tire assembly is locked in place by the nut 41!,
gree which is determined by the amount by which
An additional locking washer may be used if de
the shoulder 3l1 of the stud normally extends be
yond the back face of the panel 32!.
The bus bar terminal 43! is then placed over
Here again it will be seen .that while axial
the end 44! of the stud and held in place by the
movement is thus permitted, the engagement of
nuts 413 and 415. When all of the elements are
the milled portion of the stud in the opening 353
appropriately tightened, it will be seen from an
of similar cross section in the panel 32! prevents
inspection of the left hand side of Figure 12 that
rotation thereof. Thus once more even though
the operation of the stud assembly is su?iciently
the circuit breaker casing may be disaligned or
like those already described as not to require fur
ther description.
distorted, it may nevertheless be mounted in place
and certain of the studs may be given some axial
In order to provide for axial adjustment of the
movement to permit the utilization thereof atleast
stud for the purposes already fully described, it
for positioning the slightly distorted portion of
is necessary only to remove the washer 461 which
the circuit breaker casing on the panel.
70 may, of course, be of any appropriate thickness
Again it should be pointed out that since in a
to accomplish this purpose. When the washer
three-pole circuit breaker six such mounting
461 is removed, it will be seen that the nut 41!
studs are used, the fact that one or two or even
may then bear tightly against the shoulder 4 l1 of
three of the studs at various locations cannot
the stud without producing any clamping action
exert a tight clamping action, but are permitted 75 against the panel 42!. Thus when the stud of
Figure 13 is arranged in the manner shown at the
right hand side of Figure 12,v it may have axial
movement without however being permitted to
rotate. All of the advantages of this type of con
struction have already been previously described
and need not be further set forth.
against the back of the panel 521. The tighten
ing of nuts 511 and 512 against the washer 561
will now secure this clamping action so that the
panel is securely clamped between washer 561
and the shoulder 531.
Here again it should be noted that the line ter
minal 525 of the circuit breaker is secured in po
sition over the forward end of the stud by the
In Figures 1a and 15 I have shown a further
slight modi?cation of my stud and particularly a
nuts 551 and 552 so that the circuit breaker may
further modi?ed means for preventing rotation
thereof while nevertheless permitting axial move 10 be placed in position or removed from the switch
hoard simply by manipulation of these nuts. The
ment for alignment purposes.
bus bar terminal 551 is held on the threaded end
The stud 500 has a metallic ?ange 535. A
551 of the stud by the nuts 513 and 515.
threaded extension 543 is connected to the for—
As may readily be seen in Figure 14, the openward end of metallic member 535. This exten
ing 555 is over-size, it being much larger in
sion is of less diameter than the portion 535, thus
diameter than the portion 54[ of the stud which
producing the shoulder 544. As is seen more par
extends therethrough. This is to permit the
ticularly at the left hand side of Figure 14, the
mounting of the bushing 582 as seen in the right
rear end of stud 50B is turned down to produce
hand side of Figure 14 within the opening 553
the extension 515 of limited diameter which at
when it is desired to permit the stud to have axial
its outer end is threaded at 54 I for purposes which
movement in order to avoid a clamping action on
will now readily be understood.
the panel 521 for reasons already fully set forth.
The section 515 of the metallic portion of the
When it is necessary to permit the stud to slide
stud is knurled so as to receive and securely re
axially then a bushing 582 is slipped over the stud
tain a molded sleeve of insulation 583. The
sleeve 583 as will readily be seen from an inspec 25 between the Washer 561 and the rear face of the
neck portion 513 of the insulating member on
tion of the cross sectional view of Figure 14 is a
the stud. The bushing 582 is of a length which
member which is T-shaped in cross section, hav
is greater than the distance between the face of
ing the principal flange 5H] and a section 5l3 of
the neck portion 513 and the upper face of panel
reduced diameter, a shoulder 531 being formed by
52 iv when the stud is clamped tightly in position.
reason of this change in diameter of the sleeve.
Owing to this increased length, when the
The stud is adapted to pass through and en
washer 551 is tightened against the bushing 582
gage in the opening 553 in the panel 521, The
by the nuts 51! and 512, then the bushing is
opening 553 is counter-bored at 554 to produce
forced against the face of the neck member 513
the inner flange 556. An opening 551 is also
while the washer 551 nevertheless remains clear
formed near the periphery of the opening 553.
of the rear surface of the panel 52 l . Accordingly,
The side opening 551 extends into the ?ange 555
and is a completely enclosed opening adjacent
the periphery of the opening 553 but the section
thereof which extends through the counter-bore
clamping action against the panel is prevented
' neck 513 will not then bear against the ?ange
2 and 4 or for the similar inserts in the other
by the interposition of the bushing 582 so that
the stud on the right hand side of Figure 14 may
554 is semi-circular. This may best be accom 40 have axial movement for all of the purposes pre
viously set forth.
plished by ?rst drilling the small hole 551 in the
In Figures 16 and 17 I have shown a construc
panel 52 I‘ and then drilling the bore 553 adjacent
tion which is exactly similar to that of Figures
the hole 551 without breaking the periphery of
14 and 15 and which accordingly requires no fur
this hole.
ther description except with respect to the slight
Thereafter, the counter-bore 554 is drilled so
modi?cation of the stud to prevent rotation
that the periphery thereof passes substantially
thereof. In this modi?cation, the counter-bore
through the axis of the hole 551, thus producing
554 is provided with two semi-circular receses 580,
a hole outside of the periphery of the opening
585 on opposite sides ‘thereof, 180° apart. The
553 and a slot in the counter—bore 554.
A bronze pin 566 is force-?tted into the hole 50 neck portion 5l3 of the stud is provided with lat
eral extensions 59!], 590 which are adapted to
551 and extends up into the counter-bore 554 and
enter into and register with the extensions 580
projects thereinto, particularly as shown in Fig
in the counter-bore 554 thus preventing rotation
ure 14. Also as seen in Figure 14, the neck 513
of the stud while the nuts 55!‘ and 552 are ma
of the insulated member 583 is slotted at 55l to
register with the pin 555. The pin 555 does not 55 nipulated. With this single exception, the con
struction of Figures 16 and 17 is exactly like that
extend beyond the forward face of the panel 521
of Figures 14 and 15.
so that it does not interfere in any way with the
Of course, it should be remembered that the
clamping action of the stud hereinafter described.
essential reason for preventing rotation of the
It will now be obvious that the engagement of
a portion of the periphery of the pin 556 in the 60 stud while it is in position in the panel is to per
mit the tightening of the nuts carried by the stud.
slot 551 of the insulated portion of the stud will
Obviously if the stud were able to rotate, then
now prevent rotation of the stud while at the
no amount of rotative motion of the nuts would
same time the pin does not prevent longitudinal
be effective actually to tighten the members.
movement thereof. The clamping action of the
In Figure 18 I have shown a slight modi?ca
panel 52| is obtained by inserting the stud so that 65
tion of the metal insert 556 in each of the cir~
the shoulder 531 thereof bears against the outer
cuit breaker structures which may, if desired,-be
face of panel 52L
substituted for the metal insert 45 of Figures 1,
It will here be seen that the inner end of the
556, thus ensuring that the clamping action will 70 preceding ?gures. Obviously, the metallic insert
be obtained at the surface 531. A washer 551 is
then placed over the threaded end 541 of the
545 is mounted on and made a part of the cir
cuit breaker itself, but must be so arranged as to
cooperate with the stud construction.
In this construction, I have shown a panel 521
This washer is of greater diameter than the
bore 553 and thus provides. a bearing surface 75 of a switchboard or other structural member ‘for
stud on the rear side of the panel.
supporting the circuit breaker, the said panel
cuit breaker housings which are peculiarly suited
having an opening 653 through which a stud 600
to this type of operation.
passes. The stud 600 is here schematically
The arrangement of the studs of Figures 1-1'7
shown, it being understood that it may have any
so that they ?oat axially is still necessary in con—
of the forms of the various studs already de
nection with existing types of commercial cir
cuit breaker housings and is ._o_f course necessary
Metallic insert 646 is mounted in an opening
wherever the ?oating or resilient arrangement
650 in the circuit breaker housing. Contrary to
cannot for structural or other commercial rea
the inserts
of the prior ?gures, the insert 645
sonsbe incorporated in the circuit breaker hous
of Figure 18 does not have any formation which l0 ing itself.
adapts it to be secured into the molding of the
It should be noted for instance that where re
circuit breaker housing‘. With respect to the
liance is placed on the ?exibility or elasticity of
molding, it actually is free ?oating in that the
the current carrying terminal 626 in the circuit
cross section of the opening 658 is substantially
breaker to provide for the ?oating condition that
the same in area and shape as the cross section 15 nevertheless when the nuts 65! and 652 are tight
of the insert 646. The insert 646 is, however,
ened against the terminal 626 and hence against
non-circular in cross section so as to prevent ro
the outer shoulder 604 of the metal insert no
tation thereof and obviously the opening 650 is
further axial movement of the stud is possible.
of similar non-circular cross section.
This kind of automatic adjustment owing to the
The forward or outer end of the insert is 20 yieldability of the terminal itself within the hous
turned down to a cylindrical cross section at 603
ing and hence to the yieldability of the metallic
thus forming the shoulder 604. The shoulder
insert 646 permits the circuit breaker housing
604 bears against the inner surface of the line
automatically to adjust itself to irregularities
terminal 626. The cylindrical section 603 passes
without any residual ?oating condition in any
through the opening 62'! in the line terminal 25 of the studs when they are all tightened in place.
626 and is riveted at 665 to form an electrical
This arrangement will absorb all shocks. The
current carrying engagement with the circuit
circuit breaker housing may be spaced at a
breaker terminal 626.
distance from the panel by making section 635
The metallic insert 646 also has a bore Hi!
of the stud of a sufficient length to compensate
to permit the passage therethrough of the thread 30 for any irregularities in the surface of the
ed end 643 of the circuit breaker stud 600.
In operation the shoulder 644 of the circuit’
Again it is pointed out, however, that where
breaker stud will bear against the inner face of
existing circuit breaker structures are to be
the metallic insert. By the utilization of this
mounted on a panel the ?oating arrangement
type of insert, the necessity for the formation
possible by the use of the studs of Figures 1-17
of a special ribbed metallic insert and the ne
becomes essential.
cessity for molding the metallic insert in the cir
In the foregoing I have described a mounting
cuit breaker housing is dispensed with.
stud for a circuit breaker which enables the cir
As will be seen, any strain that may occur will
cuit breaker readily to be removed from the
take place between the shoulders 63'! of the stud 40 front of a switchboard and readily to be re
60!] bearing against the panel 62| and the said
mounted on the front of the switchboard with
shoulder 63‘! will act as a spacer in the mounting
of the circuit breaker away from the panel. The
out the necessity for obtaining access to the rear
of the switchboard. The arrangement of the
special importance of this modi?cation is that
the strain of the clamping forces in the circuit
mounting studs which I have herein described
also makes it possible by the addition or removal
of certain members thereof, to make the stud a
free ?oating mounting element. This is partic
breaker itself will not be on the molded housing
of the circuit breaker but upon the ?exible ter
minal member 626.
ularly useful at points where tight clamping of
This is so particularly because the metallic
the circuit breaker casing to the panel would be
insert 645 can slide readily with respect to the 50 injurious to its molded construction.
molded housing of the circuit breaker. It may
In theforegoing I have also set forth means
well be, in fact, that by the utilization of this
whereby automatic adjustment of the mounting
kind of metallic insert which is actually ?oat
structure may be obtained by a modi?cation in
ingly mounted in the circuit breaker housing
the construction of the circuit breaker housing
itself, the necessity for the floating arrangement 55 itself.
of the stud may be dispensed with. However,
In all of the foregoing I have described my in
this requires a modi?cation of the circuit break
vention only in connection with preferred em
bodiments which have actually been tested in
er construction.
practical use and found effective to perform the
Assuming the rigid arrangement of the circuit
breaker terminal member which occurs in most 60 functions required of them. It will be obvious
that many further modi?cations and adaptations
circuit breakers which are now manufactured
of my invention both with respect to the struc—
commercially, the necessity for forming a stud
tures of the various elements thereof and also
which can be arranged to ?oat axially for all of
with respect to the various uses thereof and also
the reasons above pointed out still remains.
65 with respect to the various adaptations in which
It might also be noted here that with the ar
these mounting elements may be used should
rangement set forth in Figure 18, if the section
now be obvious.
635 of the stud 800 which enters into the open
Accordingly, I prefer to be bound not by the
ing 650 of the circuit breaker is of the same non
speci?c disclosures herein but only by the ap
circular cross-section as the opening 650 of the
pended claim.
circuit breaker then that in itself will be enough 70
I claim:
to prevent rotation of the stud, thus dispensing
In electrical switchgear, a stationary panel
with the necessity of any cooperating elements
having a principal opening, a round conducting
on the panel itself. This again presupposes
stud extending through said principal opening
either the existence or the manufacture of cir 75 in said panel, a locking member slidable along
[said stud .to a nonerotatableiposition thereon;
said panel having additional openings‘therein;
said locki'ngrnember having‘?ngers engageable
in said additional openings to. prevent relative
rotation therebetween;v said‘ stud comprising. a
cylindrical portion and threaded‘ portions at each
endgshoulders at the junctions of said cylin
drioal- and said threaded portions, a pair of
parallel opposed flats on one end of said cylin
‘drical portion; shoulders normal to the‘axis of
ithe stud at the‘endsof said ?ats_remote irom
said adjacent threaded portion; said ‘(locking
member havingan opening embracingtheiflats
on said stud to prevent relative rotation; .the
body of said locking member abutting one side
of said panel; and means engageable withsaid
stud on the opposite side of said panel for clamp
ing said locking member to said panel.
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