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Патент USA US2121610

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June 21, 1938.
2,121,610
H. H. RUGG ET AL
DISTRIBUTION APPARATUS
Filed Oct. 50, 1935
IT ESSES:
3 Sheets-Sheet 1
INVENTORS
Harold H Pzzgg and
Paul
6/70/70
June 21, 1938.
2,121,610
H. H. RUGG ET AL
DISTRIBUTION APPARATUS
Filed Oct. 30, 1935
5 Sheets-Sheet 2
{NVENTORS
Hamid H E’ 2199 and
Pal/Z 5. ra/zam
June 21, 1938.
H. H. RUGG ET A|_
2,121,610
DISTRIBUTION APPARATUS
Filed Oct. 30, 1935
‘ 5 Sheets-Sheet 5
/5/
/3/
/5/
/6
WITNESSES:
‘
I
INVENTORS
Harold H E’Z/gg and
Patented June 21, 1938
2,121,610
UNITED STATES PATENT OFFICE
2,121,610
DISTRIBUTION APPARATUS
Harold H. Rugg, Wilkinsburg, and Paul S. Gra
ham, Turtle Creek, Pa., assignors to Westing
house Electric & Manufacturing Company,
East Pittsburgh, Pa., a corporation of Penn
sylvania
Application October 30, 1935, Serial No. 47,448
10 Claims.
Our invention relates, generally, to distribution
apparatus and, more particularly, to distribu
tion switch-boards wherein automatic circuit
breaker units are removably mounted in individ
5 ual housings.
An object of our invention, generally stated,
is to provide a means for mechanically inserting
an automatic circuit breaker unit‘ in and with
drawing the unit from a housing which shall be
10 simple and efficient in operation and which may
be economically manufactured.
(Cl. 175—298)
chanical interlocks are provided which prevent
the levering in device from being operated while
the circuit breaker handle is in the closed or the
intermediate automatic trip position, thereby
preventing the circuit breaker from being moved
to, or removed from, the operative position while
the contact members of the breaker are closed.
Additional interlocks are provided which pre
vent the operating lever from being removed
from the housing before a levering operation has 10
been completed.
A more specific object of our invention is to
For a fuller understanding of the nature and
provide a combined levering and latching mech
anism for moving a circuit breaker unit into and
15 out of a housing and for retaining the breaker
objects of our invention, reference may be had
to the following detailed description, taken in
unit in its operative position Within the housing.
Another object of our invention is to prevent
the circuit breaker unit from being moved into
its operative position in the housing or removed
20 from its operative position while the contact
members of the circuit breaker are closed.
A further object of our invention is to provide
for retaining a circuit breaker unit in an inter
mediate or test position within a housing.
25
A still further object of our invention is to
provide a removable lever for operating the
levering and latching mechanism for an auto
matic circuit breaker unit.
Still another object of our invention is to pre
30 vent the operating lever from being removed
from the housing before a levering operation has
been completed.
Other objects of our invention will be either
explained fully hereinafter or will be apparent
35 to those skilled in the art.
According to one embodiment of our invention,
a circuit breaker unit is removably mounted in
a metal housing and supporting structure. The
breaker unit is supported by a pair of angle rails,
40 one of which is secured to each side of the break
er frame, which slide into grooved steel bars,
one of which is secured on each side of the
housing. A combined levering and latching plate
is pivotally mounted on each side of the housing.
45 These plates are provided with slots which en
gage pins on the sides of the breaker frame to
retain the breaker in the operative position until
the plates are raised by a suitable operating lever
to release the breaker. The plates are also so
50 constructed that the breaker cannot be moved
to the operative position in the housing until the
plates are raised by the operating lever which
functions to actuate the plates about their pivot
v55
points and to slide the breaker into, or remove it
from, the operative position in the housing. Me
conjunction with the accompanying drawings, in 15
which:
Fig. 1 is a view, in perspective, showing a cir
cuit breaker unit in the operative position in the
housing, with the levering device in position to
move the breaker to the “test” position in the 20
housing;
Fig. 2 is a view, in perspective, showing the
breaker in the test position, with the levering de
vice in position for removal from the housing;
Fig. 3 is a similar view in perspective, showing
the breaker in the “full-out” position, with the
levering device in position to move the breaker
into the housing to the operative position;
Fig. 4 is a view, partially in side elevation and
partially in section, of a breaker unit mounted
in ahousing;
Fig. 5 is a view, in section, taken along the
line V--V of Fig. 4, and
Fig. 6 is an enlarged detail view of a portion
of the structure, showing a part of the inter
locking mechanism.
Referring to the drawings, the distribution
switchboard unit shown comprises a housing 10,
a circuit breaker unit II, which is removably
mounted in the housing, and a levering device I2
for moving the circuit breaker unit ll into and
out of the housing ID. A number of units, such
25
30
35
40
as the one shown, may be arranged in banks
stacked vertically and horizontally to form a
distribution switchboard having any desired 45
number of individual units. The draw out fea
ture for the circuit breaker unit herein described
is particularly desirable, as it permits complete
disconnection of a breaker unit from the bus bar
structure, thereby permitting inspection of the 50
breaker unit without deenergizing the main bus
and without hazard to the inspector.
The housing I0 may be built of formed sheet
metal or other suitable material. As shown, the
housing consists of side panels I 3 and I4 and a 55
2
2,121,610
bottom section l5. A front panel or door (not
shown) may be attached to the housing by hinges
or by spring clips in order that it may be readily
removed from the housing. The rear of the
housing unit may be left open in order that the
primary disconnect contacts i6 of the circuit
breaker unit may readily engage the bus bar
screw 42.
structure H which is at the rear of the switch
board structure, as shown in Fig. 4. The auxil
tion in the housing.
As will be described more fully hereinafter, the
front edges of the plates 4| are disposed to en 10
10 iary contact members 58 for the circuit breaker
unit are also mounted at the rear of the switch
board structure.
The main contacts illustrated are of the blade
and ?nger type, the bus bars I? constituting sta
tionary blades mounted upon insulating cross
bars Hi and the ?ngers l6 being carried by the
circuit breaker unit. The auxiliary contacts H!
are of the self-aligning ?nger type, the ?ngers
2! being mounted upon suitable supporting mem
bers 22 and disposed to engage contact plates 23
carried by the circuit breaker unit.
As shown in Fig. 4, when the circuit breaker
unit I | is in the operative position the main con
tact members |6 engage the bus bars IT and the
25 auxiliary contact ?ngers 2| also engage the con
tact plates 23. When the circuit breaker is
moved out to the “test” position, the main con
tact members l6 are disengaged from the bus
bars ll, but the auxiliary contact ?ngers 2| still
engage the contact plates 23, thereby permitting
testing operations of the circuit breaker mecha
nism. When the breaker is moved to the “full
out” position, both the main contact members
and the auxiliary contact members are disen
gaged.
The levering device I 2 is provided for inserting
the breaker unit II from either the “out” or the
“test” position to an “in” or operative position
and for withdrawing the breaker unit from the
operating position. The lever l2 comprises a
pair of side bars 24 spaced by suitable cross mem
bers 25 and 26. The side members 24 may be
of su?icient length to provide a suitable operating
lever for moving the circuit breaker into and out
of the housing Hi. As shown, a notch 21 is pro
vided near the end of each one of the side bars
24, thereby constituting a hook for engaging the
circuit breaker unit, as will be more fully de
scribed hereinafter.
Each side bar 24 is also provided with a verti
cally extending member 28 which is suitably
braced to the bar 24 by a brace 29. A roller 3|
is mounted at the top of each of the upright
members 28. The cross member 26 is provided
with a downwardly extending projection 32, the
function of which will be described hereinafter.
In order that the circuit breaker unit || may
be slidably mounted in the housing In, a hori
zontally disposed grooved bar 33 is secured to the
60 side panel |3 and a similar bar 34 is secured to
the panel l4 for supporting the breaker unit in
the housing. Stop pins 35 and 36 are provided
on the bars 33 and 34, respectively, for stopping
the outward movement of the circuit breaker unit.
65 The stop pin 35 is carried by a plate 31 which is
loosely mounted on top of the bar 33 by a suitable
screw 38, and the pin 36 is carried by a similar
plate 39 mounted on top of the bar 34. As shown
the pins 35 and 36 extend through the top por
70 tion of the bars 33and 34 into the grooves pro
vided in the bars.
Each of the plates 4| is provided with
a slot 43 which engages a screw 44 in the side of
the housing to limit the movement of the plate
about its pivot pin 42. A slot 45 is also provided
in the lower edge of each plate for engaging a
suitable pin 46 on the circuit breaker frame to
retain the circuit breaker in the operative posi
gage the pins 48 to prevent the circuit breaker
unit being inserted into the housing past the
“test” position until the plates 4| have been
raised by the levering device l2. Suitable slots
éil and 48 are provided in the upper portion of
the plates 4| for the rollers 3| on the levering
device |2.
A projection 49 is also provided on each of the
plates 4| which cooperates with a rectangular
block 5| secured to each side of the housing a pre— 20
determined distance above the top edges of the
plates 4|. As will be described more fully here
inafter, the blocks 5| are so disposed that the
rollers 3| will not pass between the top of the
plates 4| and the bottom of the blocks 5|, except
when the plates are in their normal position,
thereby preventing the lever | 2 from being re
moved from the housing before a levering opera
tion has been completed.
As'shown in Fig. 5, an angle rail 52 is secured
to each side of the breaker frame for supporting
the breaker unit in the grooved bars on the sides
of the housing ID.
If desired, the levering pins
46 may be secured to the upper portion of the
angle rails 52, as shown, or they may be secured
to the breaker frame in any other suitable man
ner a short distance above the angle rails 52.
The angle rails 52 and the grooved supporting
bars 33 and 34 are located approximately mid
way between the top and the bottom of the unit. 40
The circuit breaker unit H is provided with a
handle 53 for operating the circuit breaker con
tact members in a manner well known in the
art. In the circuit breaker illustrated, the con
tact members are closed when the handle 53 is in 45
its uppermost position. The circuit breaker con
tact members may be manually opened by lower
ing the handle 53 to the position shown by dotted
lines in Fig. 6. If the circuit breaker contact
members are opened automatically by the over 50
load-trip mechanism, the handle 53 is actuated
to a mid position.
As shown in Fig. 6, an interlocking plate 54 is
secured to the breaker handle 53 and is so dis
posed that it will interfere with the projection 55
32 on the levering device l2 to prevent the slots
2? in the side members 24 of the lever from en
gaging the pins 46 when the breaker handle 53
is in its uppermost position. The interlocking
plate 54 will also prevent the lever |2 from en 60
gaging the circuit breaker unit when the handle
53 is in the intermediate or automatic trip posi
tion, but will not prevent the functioning of the
levcring device when the handle is in its lower
most position, as shown by the dotted lines.
65
In this manner, the removal of the circuit
breaker from its operative position while the
contact members of the breaker are closed is
prevented. The insertion of the breaker into the
housing beyond the test position while the breaker
handle 53 Bin either the closed or the automatic
With a view to controlling the movement of the
trip position is also prevented, since the levering
circuit breaker | | into and out of the housing ID,
a triangular latching plate 4| is pivotally mount
75 ed on each side of the housing I!) by a suitable
device l2 cannot engage the levering pins 46 on
the breaker unit to slide the breaker into the
housing.
75
2,121,610
Assuming that the breaker handle 53 has been
operated to its lowermost position to open the
circuit breaker contact members, the breaker unit
may be inserted into the housing i Elby lifting the
unit to a position immediately in front of the
housing and inserting the angle rails 52 in the
grooved bars on the sides of the housing. It
will be noted that the stop pins 35 and 36 are so
beveled that they do not interfere with the in
10 sertion oi the angle rails into the grooved bars.
The breaker unit may be pushed by hand into
the housing as far as the “test” position where
the front edges of the latching plates 4| will en
gage the pins 65 to prevent the further inser
15 tion of the breaker unit.
As shown in Fig. 3, the levering device [2 may
be piaced in position to move the breaker into
13
in either the closed or the automatic trip posi
tion, since the interlock plate 54 prevents the
use of the levering device l2 to release the latch.
ing plates 4| and move the breaker unit. The
levering device l2 can be utilized only when the
operating handle 53 is in its lowermost oif posi
tion.
From the foregoing description, it is apparent
that we have provided a switchboard unit of the
draw-out type which occupies a relatively small
amount of space and may be readily combined
with similar units to form a complete switch
board of pleasing design and appearance. We
have also provided a simple and inexpensive
means for mechanically inserting a circuit break.
er unit into and withdrawing it from its housing
the housing to the operative position by placing
and having the necessary interlocking features
for the protection of the apparatus and the oper
the rollers 34 in the slots 4? in the latching plates
ator.
20 4! and hooking the side bars 24 over the levering
pins
on the sides of the breaker unit. A down
ward movement of the lever handle ?rst raises
the latching plates iii to remove the interference
between the latching plates and the pins 46 by
25 raising the plates 2. distance permitted by the
slots £53 which engage the pins 44 in the side of
the housing. A further downward movement of
the lever i2 forces the circuit breaker unit into
the housing to the operating position. Upon re
30 moval of the rollers 39 from the slots 4? the latch
ing plates iii will drop to their normal position
and the slots 125 will engage the pins 45 to lock
the breaker securely in the operating position.
When the latching plates 4| drop to their normal
35 position, the rollers 3! will pass between the
upper edge of the plates 4| and the blocks 5|, as
previously described, and the lever |2 may be re
moved from the housing.
The breaker unit may be removed from the
housing by practically reversing the foregoing
operation. As shown in Fig. 1, the rollers 3| are
inserted in the slots 48 in the latching plates 4|
and the notches 2'? in the side members 24 engage
the pins 4'6. Raising the lever handle presses
the rollers 35 against the front faces of the
latching plates Ali to raise these plates to a posi
tion in which the pins 46 are released from the
slots 45
the lower edges of the plates. A
further upward movement of the lever slides the
50 breaker unit from the operating position to the
“test” position where the stop pin 36 prevents
further removal of the breaker unit until it is re
leased.
The levering device l2 may then be removed
55 from the housing 46, allowing the latching plates
iii to drop to their normal position with the front
edges of the plates engaging the levering pins 46,
as shown
Fig. 2.
‘The breaker is now in the
“test” position and, since the auxiliary contact
60 members are still engaged as previously de
scribed, the breaker operating mechanism may
be tested if desired.
rI‘he stop pin 35 may be released by manually
raising the plate 39 to permit the breaker unit
65 to be withdrawn to the “out” position where the
stop pin 35 on the supporting bar 33 will engage
one of the angle rails 52 to prevent further with
drawal of the breaker unit from the housing.
Complete withdrawal of the breaker unit from
70 the housing is accomplished by raising the plate
3'5 to release the stop pin 35.
As described hereinbefore, the breaker unit
cannot be moved from the “test” to the “in”
position, or from the “in” to the “test" position
75 when the operating handle 53 of the breaker is
.19
.15
.
' Since many modi?cations may be made in the
apparatus and arrangement of parts without de
.20
parting from the spirit of our invention, we do
not wish to be limited other than by the scope
of the appended claims.
We claim as our invention:
1. Current distribution apparatus comprising
2.5
a housing, a circuit breaker unit removably
mounted in the housing, combined levering and
latching plates pivotally mounted on the sides
of the housing substantially parallel to said sides 39
for controlling the movement of the breaker unit
into and out of the housing, and means for lim
iting the movement or" said latching plates about
their pivot points to cause the plates to act as
fulcrums for levering the breaker unit into and 35
out of the housing.
2. Current distribution apparatus comprising
a housing, a circuit breaker unit slidably mounted
in the housing, and combined levering and latch
ing plates pivotally mounted on the sides of the 40
housing, said plates having means disposed to
engage the circuit breaker unit to control its
movement into and out of the housing and addi
tional means acting as fulcrums for levering
the breaker unit into and out of the housing.
3. Current distribution apparatus comprising 45
a housing, supporting bars on the sides of the
housing, a circuit breaker unit slidably mounted
in the housing on said bars, combined levering
and latching plates pivotally mounted on the
sides of the housing, said plates having notches 50
disposed to engage the circuit breaker unit when
in predetermined positions on said bars to control
its movement into and out of the housing, and
means disposed on said supporting bars to inter
rupt the outward movement of the breaker unit
55
independently of said plates.
4. Current distribution apparatus comprising
a housing, supporting bars on the sides of the
housing, a circuit breaker unit slidably mounted 60
in the housing on said bars, combined levering
and latching plates pivotally mounted on the
sides of the housing, said plates having notches
disposed to engage the circuit breaker unit when
in predetermined positions on said bars to con 65
trol its movement into and out of the housing,
and releasable means disposed on said supporting
bars for stopping the outward movement of the
breaker unit.
5. Current distribution apparatus comprising 70
a housing, horizontally disposed supporting bars
on the sides of the housing, a circuit breaker unit
slidably mounted in the housing on said bars,
combined levering and latching plates pivotally
mounted on the sides of the housing, said plates 75
4
2,121,610
having notches disposed to engage the circuit
breaker vunit when in predetermined positions
on said bars to control its movement into and
control the movement of the breaker unit into
and out of the housing, a removable levering de
vice for actuating the latching plates about their
manually releasable out of the housing, and
pivot points, said levering device cooperating
means disposed on said supporting bars for stop
ping the outward movement of the breaker unit
with the latching plates to slide the breaker unit
into and out of the housing, and interlocking
means disposed in said housing to prevent the
removal of the levering device except when the
breaker unit is in predetermined positions in
at predetermined positions.
6. In current distribution apparatus, in com
bination, a housing, a circuit breaker unit re
10 movably mounted in the housing, combined lever
the housing.
1O
ing and latching plates pivotally mounted on the
9. In current distribution apparatus, in com~
sides of the housing to control the movement of
the breaker unit into and out of the housing, and
bination, a housing, a circuit breaker unit slid
ably mounted in the housing, an operating handle
a levering device for engaging the breaker unit
to
actuate the latching plates about their pivot
15
points, said levering device cooperating with the
for the circuit breaker, a removable levering de
vice for insertion into said housing to engage the
breaker unit to slide it into and out of the
housing, and interlocking means carried by the
breaker handle and disposed to prevent the
levering device from engaging the breaker unit
latching plates to move the breaker unit into and
out of the housing.
7. In current distribution apparatus, in com
20 bination, a housing, a circuit breaker unit slid
ably mounted in the housing, combined levering
and latching plates pivotally mounted on the
sides of the housing to control the movement of
the breaker unit into and out of the housing, and
a removable levering device for engaging the
breaker unit to actuate the latching plates about
their pivot points, said levering device cooperat
ing with the latching plates to slide the breaker
unit into and out of the housing.
30
8. In current distribution apparatus, in com
bination, a housing, a circuit breaker unit slid
ably mounted in the housing, latching plates piv
otally mounted on the sides of the housing to
under predetermined conditions.
10. In current distribution apparatus, in com
bination, a housing, a circuit breaker unit slid»
ably mounted in the housing, an operating handle
for the circuit breaker, a removable levering de—
vice for insertion into said housing to engage the
breaker unit to slide it into and out of the
housing, and interlocking means carried by the
breaker handle and disposed to interfere with the
insertion of the levering device to prevent it from
engaging the breaker unit except when the 30
breaker handle is in the o? position.
HAROLD H. RUGG.
PAUL S. GRAHAM.
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