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Патент USA US2412294

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Dec. 10, 1946.
w_ M, scoTT, JR
2,412,294
CIRCUIT BREAKER LOCKING DEVICE
Filed April 14, 1942
s Sheets-Sheet 1
5:71
W
Dec. 10, 1946.
2,412,294
W. M. SCOTT, JR
CIRCUIT BREA-KER LOCKING DEVICE
Filed April 14, 1942
6 Sheets-Sheet 2
550
J20
INVENTOR.
BY
:
Q
i
b
10, 1946.
w_ M_ SCOTT, JR
2,412,294
CIRCUIT BREAKER LOCKING DEVICE
Filed April 14, 1942
.
.
6y Sheets-Sheet
' INVENTOR.
Mm?” ‘M 5' mad at
BY 2
z
Disc. 10, 1946.,
M_ sco'r'r, JR
2,412,294
CIRCUIT BREAKER LOCKING DEVICE
Filed April 14, 1942
6 Sheets-Sheet 4
IINVENTOR. '
Dec. 10, 1946.
w. M. SCOTT, JR
‘
2,412,294
CIRCUIT BREAKER LOCKING DEVICE
Filed April 14, 1942
M
J
'
\ .
6 Sheets-Sheet 5 -
304
.
INVENTOR.
210mm M ‘520:’: J”
ZJW
Dec. 10, 1946. '
w. M. SCOTT, JR
2,412,294
CIRCUIT BREAKER LOCKING DEVICE
Filed April 14, 1942
6 Sheets-Sheet_6
Patented Dec. 10, 1943
2,412,294
Ubé'iTED STATES PATENT OFFICE
2,412,294
CIRCUIT BREAKER LOCKING DEVICE
William M. Scott, Jr., Bryn Mawr, Pa., assignm
to I. '1‘. E. Circuit Breaker Company, Philadel
phia, Pa, a corporation of Pennsylvania
1
Application April 14, 1942, Serial N 0. 438,871
16 Claims. (01. 200-109)
My invention relates to circuit breakers and
2
provision of a lock-in mechanism which will posi
tively engage a closing toggle of a circuit breaker
particularly to operating mechanism therefor and
apparatus for locking the operating mechanism
to prevent collapsevthereof under any circum
to maintain the circuit breaker in closed position.
stances.
Primarily, my invention is designed for use in 5
Still another and important object of my in
connection with circuit breakers which are to
vention is the provision of a lock-in device which
withstand severe shocks without being tripped.
itself is shock-proof so that it may not itself be
Where circuit breakers are utilized to control
jarred out of position.
electrical apparatus in naval craft of various
These and many other objects of my invention
types, it may at times become desirable to en 10 will become apparent in the following descrip
sure that the circuit breaker will, under no cir
tion and drawings in which:
cumstances, be tripped open irrespective of the
Figure l is a side view partly in cross-section
shock or jar which it may receive; and indeed
of a circuit breaker of the type in connection
irrespective of the nature of the overload to which
with which my lock-in device may be used.
the circuit it protects is subjected.
15
Figure 2 is a side view with the side cover
Where naval craft are subjected to the shock
broken away of the operating mechanism for the
of gun ?re (recoil or impact) such shocks neces
circuit breaker of Figure 1 showing the position
sarily occur on occasions when it is more de
of the operating mechanism when the circuit
sirable to maintain the operation of apparatus
breaker is open.
rather than to protect the apparatus against in
Figure 3 is a view corresponding to that of Fig
jury from overload. In such cases the tripping
ure 2, showing the position of the operating
open of a circuit breaker in order to protect spe
mechanism when the circuit breaker is closed.
ci?c apparatus may actually result in disabling
Figure 4 is a cross-sectional View taken on line
of the vessel.
4—4 of Figure 2 looking in the direction of the
In other Words, there are conditions which
arrows.
may be encountered by naval craft where it is
Figure 5 is a cross-sectional view taken on line
desirable to maintain apparatus in operation to
5—-5 of Figure 3 looking in the direction of the
the last possible moment irrespective of injury to
arrows.
the apparatus itself. When such conditions oc
cur, it becomes necessary to lock the circuit
breaker closed to prevent its opening under any
shock or impact of any foreseeable nature.
An object of my invention, therefore, is to pro
vide a lock-in device for a circuit breaker which
will maintain the circuit breaker contacts in
closed position irrespective of the physical shock
Figures 6, 7, 8 and 9- are diagrammatic views
showing various steps in the operation of the
members of Figures 2 and 3; Figure 6 showing
an open condition of the circuit breaker; Figure
7 showing the closed condition of the circuit
breaker; Figure 8 showing the circuit breaker
' locked in position by the lock-in device of the
present invention; and Figure 9 showing a posi
tion which the circuit breaker operating mech
anism maintains during tripping thereof and dur
Another object of my invention is to provide in
connection with the circuit breaker operating 40 ing the movement of the parts from the Figure 7
position to the Figure 6 position.
mechanism a lock-in device which may be easily
or electrical overload to which it may be sub
jected.
Figure 10 is a view in perspective of the lock-in
device of my invention showing the manner in
which the same may be combined with portions
a lock-in device for a circuit breaker for the pur
poses above set forth wherein the lock-in device 45 of the operating mechanism of Figures 2 and 3.
Figure 11 is a view in perspective correspond
is operable in connection with the closing and
tripping mechanism of the circuit breaker to
ing to that of Figure 10 but showing the move
render the tripping mechanism inoperative ‘and
ment of the lock-in device to effect a tripping of
to lock the closing mechanism in position where
the circuit breaker.
it supports the movable contact in engagement 50
Figure 12 is a view corresponding to that of
with the stationary contact.
Figure 10 showing, however, a movement of the
A further object of my invention is the pro
lock-in device to prevent the closing of the cir
vision of a lock-in device for a circuit breaker
cuit breaker.
which will render the tripping latch ine?ective.
Figure 13 is a top view of a portion of the ele
An additional object of my invention is the
ments of Figure 10.
manipulated by even an unskilled operator.
A further object of my invention is to provide
2,412,294
3
Figure 14 is a top view of a portion of the ele
ments of Figure 12.
Figure 15 is a front view and Figure 16 is a side
4
tact carrying arm is more fully described in the
aforementioned applications of Pokorny and
Scott, as well as in Scott application Serial No.
339,689, ?led June 10, 19410, which became Patent
vieW of the lock-in device elements correspond~
01 No. 2,375,328 on May 8, 1945.
ing to the position of Figure 10.
The movable arcing contacts El’ are mounted
in the upper part of the contact carrying arm lit
and are supported by arcing contact levers ‘E5 so
that during the opening movement of the cir
Figure 19 is a front view and Figure 20 is a side
view of the lock-in device elements correspond 10V cuit breaker they disengage the stationary arcing
contact 12! after the movable contacts have dis
ing to the position of Figure 12.
Figure 17 is a front view and Figure 18 is a side
view of the lock-in device elements correspond
ing to the position of Figure 11.
Figure 21 is a cross sectional View taken on line
engaged.
The particular arrangement and mounting of
iii-2i of Figure 13.
the arcing contacts to produce this result is also
Referring now to the ?gures, the operation of
my circuit breaker lock-in mechanism may best 15 more speci?cally described in the applications
above mentioned.
be understood from a preliminary description of
A ?exible lead 93 is secured to the lower end
a typical circuit breaker in connection with which
of the arcing contact lever 75 and at its opposite
the same may operate.
end is secured to the terminal post M.
In Figure 1 I have shown a circuit breaker of
The stationary arcing horn 23b is mounted in
the type more speci?cally described in applica
the arc chute tee and connected by a ?exible lead
tion Serial No. 339,682 of Pokorny, and applica
198 to the lower terminal it.
tion Serial No. 339,687 of Scott, both ?led June 10,
Since the leads 43, 93 and 190 are
con
1940, which became, respectively, Patent No.
nected to the lower terminal block M, the blow
2,390,735, on December 11, 1945, and Patent No.
out magnet I22, as hereinafter described, will thus
2,3e8,228, on May 9, 1944.
be in series ?rst with the main contacts, then with
This circuit breaker may consist of one, two,
the arcing contacts, and ?nally with the arcing
three or more poles operable by a single operating
horns.
mechanism.
When the main contacts are disengaged, cur
Each of the poles 2c is’ mounted on the face of
rent ?ows to the arcing contacts through the
an ebony, asbestos or slate panel 23 which forms
blow-out coil as follows: From the upper back
the mounting plate of the entire circuit breaker
connection stud 152, current flows into the lower
arrangement.
terminal block 125 of the blow-out magnet coil
The main bracket or housing 21% which sup
I22, around the coil to its upper terminal plate
ports the operating members is secured to the
I29 and thence to the stationary arcing horn I23
panel 23 by means of screws
the heads of
which are recessed in the openings 26 in the back
which is secured thereto. The current then flows
to the stationary arcing contact [2L thence to
the movable arcing contact 81, then through the
arcing contact lever 75, the ?exible lead
the
23 which extend on each side of a horizontal shelf 40 terminal block it, the coil IE9, and the connec
tion stud ill in the manner hereinbefore de
3%? to which they are welded, or otherwise secured.
scribed.
The operating mechanism is contained in hous
The upper part 138 of the arcing horn i213 is
ing 31 and is bolted to the lower side of the shelf
extended along the panel and forms a hook for
36 by bolts 33 passing through ?anges in the hous
anchoring the back end of the arc chute. The
mg.
front of the arc chute use is locked in place
Link as. connects the operating mechanism in
by a screw {62 passing through a lug £53 in‘ the
housing It! to the lever 35 which is secured to
the contact carrying shaft 45 and rotatable there
chute
arcing I55‘
hornandI68through
which is
a conductive
mounted inplate
the It:
with. The contact carrying shaft :25 is a steel
secured
to
the
insulating
bridge
37.
'
member of square cross-section covered with
The blow-out coil l 22 is so arranged as to drive
suitable phenolic insulation and is rotatably
the arc upwardly into the arc chute E58.
mounted between the side plates 28 of the main
The speci?c form and operation of the blow-out
bracket 25!.
coil is set forth in the applications above de
The main stationary contacts 36 are secured
scribed and also in application Serial No. 339,688
to a back connection stud d2 which is mounted
of Scott, ?led June 10, 1940, which became Patent
on the panel above the bracket 24 and support
No. 2,311,701 on February 23, 1943.
the inner ends of the arc chutes in the manner
The speci?c internal structure of the arc chute
hereinafter described. A bridge 37 of insulat
which serves to extinguish the arc is described
ing material secured to the outer end of the
and set forth in application Serial No. 384,245 of
bracket 24 supports the outer end of the arc
Graves, ?led March 20, 1941, which became Pat
chutes.
.
ent No. 2,338,715 on January 11, 1944. ,The Vari
The path of the current when the contacts are
ous members of the circuit breaker are described
closed is through the connection stud 42, the sta
in these general terms since the speci?c por
tionary contact 36, the stationary tip lit), the
movable contact tip M mounted on the contact 65 tions thereof may be varied without departing
from my invention.
lever of) which carries the ?exible connection 433,
My invention relates to members operable in
the opposite end of which is connected to ‘the
connection with the closing and tripping mech
lower terminal 64 which, through the over current
anism of the circuit breaker and may be adapted
trip coil Hi! is connected to the lower back con
to circuit breakers having contact'assemblies, arc
nection stud Ill.
chutes, blow-outs, and other elements which are
The contact lever 69 is mounted on the contact
completely different in form and operation from
carrying arm £58 which, in turn, is secured to and
the clrcuitbreaker herein described. The present
rotatable with the contact carrying shaft Q5.
circuit breaker is described as a type in connec
The particular arrangement of the contact lever
tion with which my invention may operate.
and the resilient mounting thereof on the con-
of the panel and which pass through perforations
27 in the panel to engage the main bracket.
rf‘he bracket 24% consists of ?anged side plates
a:
32,412,294
a
The contact carrying shaft 45 is biased by a
spring (not shown) to rotate in counterclockwise
direction with respect to Figure l.
The operating mechanism hereinafter described
serves to rotate the shaft ‘i5 and its contact
carrying arm 48 in clockwise direction against
the bias of its opening spring and to maintain
the contacts in closed condition against this bias.
When the circuit breaker is tripped, members
which maintain the shaft 155 in closed position
are released and it is able then to respond to the
opening bias of its spring in order to rotate the
movable contacts counterclockwise to open circuit
position.
Any circuit breaker which has a movable con—
tact which may be moved to engagement with a
stationary contact and which is held in engage
ment against the bias of an opening spring may
be utilized in connection with the operating mech
anism and lock-in device hereinafter described.
The operating members contained in housing
The
3| are
housing
shown 3!
more
is aspeci?cally
steel box closed
in Figures
on the
2 and
front,
bottom and sides and is provided with flanges 32
at the upper edges of the sides so that it may be
secured by bolts 33 to the shelf 38 of the housing
racket assembly. The side walls of the housing
are pierced for the main stationary pins of the
mechanism and the metal around the holes is
extruded inwardly and reamed to obtain proper -
bearing for the pins.
The operating mechanism comprises a plural
ity of toggles so arranged that the knee pins of
each may be supported when the contacts are
closed; but wherein the supports may be removed,
permitting the contacts to open when the trip
ping operation is eifected.
One of the toggles comprises an operating link
200 preferably and for structural reasons, forme
from a pair of side plates connected by a tie plate
203. Link 200 is rotatable on the fixed pivot
204 which is carried in perforations of the side
walls of the casing.
The link 200 also carries on its opposite end
rotatably mounted between its side plates the 45
knee pin 205.
Link 200 which also is formed from a pair of
side plates having a rigidifying tie plate 209 there
between is rotatably mounted at one end on the
knee pin 205 and carries at its opposite end a
pin 2 i 0.1
A lug 2i i is rotatably mounted on pin 280 and
a tension spring 2l2 is secured thereto. The op
posite end of spring 252 is secured to a lug 2E8
which is rotatably mounted on a pin 2M carried
by the upstanding lug 2 i 5 of one of the side plates
of the link 200.
The effect of tension spring 2l2 is to collapse
the toggle 200-200 to the position shown in Fig
6
the stationary pin 222 and comprises a V~shaped
member having a center portion 220 which is piv
otally mounted on the pin 222, an abutting por—
tion 22'.’ adapted to engage a roller on the
in
205
a release portion 223 shown entirely in
dotted lines behind the latch lever 2 i S in Figures
2 and 3.
The upper edge of release portion 223 is in en
gagement with the under side of tie plate
22i of the latch lever 2IS so that any downward
movement of the latch lever will result in a clock»
wise rotation of the abutment 225 and thus will
result in moving the abutting portion 227 there
of out of engagement with the roller on pin 205.
A spring 240 is so arranged as to yieldingly sup
port the abutment member 225 so that the abut
ment 22'! may always be in position to engage
the roller 205.
Pressure of the release portion 22;’: against plate
22| of the latch lever limits the effect of the
spring 220 and serves positively to position latch
ing portion 22? in predetermined position.
When link 200 is raised and the knee pin 205 of
the toggle formed by the links 209-406 is, there
fore, raised, then since the link 250 (by reason
of its attachment between pins 210 and 211) pre
vents pin 2 II] from approaching closer to the pin
214, the only direction in which link 206 may ro
tate is such that pin 210 moves clockwise with
respect to pin 205.
Raising of link 200 results in extension of the
spring 2l2 (the members assuming the position
shown in Figures 3 and 7), and in an increase of
force tending to draw the pins 2l0 and 2M to
gether, thus creating a tendency to collapse tog~
gle 206-400 (since this toggle does not move
through center).
When, therefore, the supporting means herein
described has been removed from the toggle, it
will immediately collapse owing to the tendency
of the spring 2l2 to draw pins 216 and 244 to
gether.
When the members are moved from the posi
tion of Figures 2 and 6 to the closed position of
Figures 3 and '7, pin 2|‘! remains stationary since
it is mounted on the latch lever 218, one end of
which is ?xed by its mounting on pin 222 and the
other end of which is ?xed by engagement of the
latching tip 230 thereof with the notch 23E of
the primary latch 232.
Therefore, during the closing operation, the
center of rotation of link 2IB is ?xed and for this
reason also pin 2|0 is to some extent at least
supported by link ZIB. This partial support re
sults in downward pressure upon a latch lever
H8 in the closed position of Figures 3 and 7 thus
resulting in pressure of the‘ latch lever tip 230
upon the base 233 of the notch 23!.
As the operating link 200 is raised, the roller
ure 2.
60 on pin 205 comes in contact with the surface
A third link 2i6 which may be formed from a
234 of the abutment 225 and moves the same in a
pair of independent side plates is rotatably mount
clockwise direction so that the knee pin 205 may
ed at one end on the pin 2i0 and at the opposite
end is connected to, the pin 22? which is carried
by the latch lever 2 i 8.
The latch lever also comprises a pair of side
rise.
plates having a rigidifying tie plate 22l there
between.
One end of the latch lever 2l3 is ro
tatably mounted on the ?xed pin 222. Pin 2H3
also rotatably supports one end of the connecting
link 34 which extends between the operating
mechanism and the actuating arm of the contact
carrying shaft. This link is a single wide mem
After the pin 205 has passed the area 234, then
the spring 240 of the abutment pushes the abut
ment 225 in a counterclockwise direction so that
member 228 of the abutment abuts against tie
plate 22! of the latch lever H0 and so that the
abutting portion 221 is swung beneath the roller
on knee pin 205 to support the same against
the tendency of spring 2 12 to collapse the toggle.
The abutment 227 may again be rotated clock
wise out of engagement with the roller and pin
205 by any force which may depress the latch
ber of phenolic insulation.
An abutment 225 is also rotatably mounted on 75 lever 218.
7
g
The means by which this is accomplished in
cludes the primary latch 232 and the secondary
milled latch 256.
the support
toggles are
therefor
reset isbyremoved.
the tension
Thereafter,
‘spring ‘212,
the upward or counterclockwise force exerted by
For this purpose also it should be noted that
knee pin 2th of the toggle formed by links 34
and 2H5 does not pass through center, when the
the lever 2ft serves also to reset the latch lever
218.
The primary latch 232 and the secondary milled
latch 250 are designed so that in addition to
closed position is reached so that this toggle
may also be collapsed. The collapsing pressure
on this toggle is that which is exerted by the
contact opening spring to cause a counterclock
wise rotation of shaft is. This counterclockwise
rotation creates a downward pressure on link as
readily tripping the circuit breaker, they may
automatically be reset by such upward movement
10 of the latching tip 230 of the latch lever 2 H5.
which, through pin 2H! and link 2E6, is trans
mitted to the pin 21'] carried by latch lever 2l8.
The primary latch comprises a curved link 232
which is pivotally mounted on the stationary pin
260.
Member 232 has a front cam surface 26L the
notch 2S5 hereinbefore described, the latch lever
abutment 233, and the resetting toe 262. This
position. Knee pin 255 is supported by the abut
primary latch is maintained in latching position
ment 225; knee pin tie is supported in part by
by the inilled latch 2583 which normally prevents
the stabilized position of knee pin 2% and in
counterclockwise rotation of the latch 232.
part by the stabilized position of pin 2 i ‘I.
When ‘restraint against counterclockwise rota
When support is removed from the latch lever 20
tion of the latch 232 is removed, then pressure
218 and it is allowed to drop under the substan
of the tip 23% of the latch lever 253011 the abut
tially vertical downward pressure exerted there
portion ‘233 of the notch '23! ‘causes latch
on through links 31% and 216 (when in the closed
to rotate about its pin thus releasing the
circuit position of Figtu‘es 3 and 7), then as the
latch lever 253 and allowing the pressure there
tip 236 of lever 253 drops, the tie plate which is
in contact with portion 228 of abutment 225 ro
on to cause it to drop.
The forcing down of latch lever 2 i8 also forces
tates the same to move it out of supporting posi
abutment 2255 out of position and permits the
tion for the pin 2%.
All of the knee pins are supported in closed
Toggle 2tlii~2t5 then collapses "under the in
fluence of spring 212 causing thetog'gle 3442!?!
to collapse thus resetting the mechar'iism.
The circuit breaker opening operation does not,
however, depend on the collapse of toggle
2tt—2ili5.
When the support is removed ‘from the latch
lever 2l8, it may immediately drop under the
in?uence of the downward pressure of links 34
and 2N; and thus momentarily assume the posi
tion shown in the diagrammatic showing of Fig
ure 9.
The abutment 225 is thereby swung out so that
it no longer supports pin 205, and toggle 2iit—2ii6
may collapse, thus restoring the members to the
position shown in Figure 6.
V
v
The purpose of spring 2‘l2, therefore is to reset
the mechanism after a tripping operation has
occurred.
\
The circuit breaker operating mechanism may
be trip free. Thus, as seen in'Figure 9, latch l'e've'r
2R8 may trip when ‘released [from its primary
latch under the pressure of links 35 and-236, even
though toggle Bile-2% is not collapsed. This
may occur, for instance, when the‘ operating link
main contacts to open in response to the con
tin'uation of the opening spring.
The position as the dropping motion or" the
latch lever completed is shown ‘in the schematic
view of Figure 9. This position occupies but a
brief moment during the tripping operation and.
is but one stage of a continuous movement.
As link 2E6 swings about its pivot ‘2H by rea
son of the drawing together of pins ‘2m and 214,
then the previous downward pressure exerted by
link 2 it becomes a pull (owing to tension spring
2l2).
This results in counterclockwise rotation of the
latch lever and a raising of the latching tip
Zti thereof.
As the latch lever is pulled up, the pressure of
its tip against the cam surface 255 prevents the
resetting of the primary latch 232 until tip 238
strikes the projecting toe 262.
The pressure of
the upward movement of the latch tip 2% be
i the toe 262 now rotates the primary latch
50 232 clockwise toward the position thereof shown
2% is held in raised position either manually
in Figures 2 and 6 so that the latch tip enters
the notch 223i and lies between toe ‘262 and abut
ment 233 in preparation for any subsequent clos
ing or tripping operation which may be re
or otherwise. In this case, on release of the m‘a'n- '
quired.
ual pressure which holds the link ‘2% in raised
An abutment 362A on the bottom wall of the
position, the mechanism isagain moved‘ to the
housing engages the extension 302 of the primary
position shown in Figure 6 where it is ready, once
latch 232 to limit its rotation when the toe there
more, for a closing operation.
oi‘ is struck by the latch lever.
When the mechanism is permitted to move 60
The milled latch 250 restrains the primary
from the position of Figure 7 through the posi
latch ‘232 against any rotational movement in re
tion of Figure 9 to the position of Figure 6 with
sponse to downward pressure on the latch lever
out being impeded by any manual closing pres
sure, then, ‘when the contacts open, the pin 2H1
2E8.
The milled latch 250 cannot return to its
original restraining position, however, until the
Thereafter the pin’ is moved ‘toward the left
primary latch has been engaged, since the move
with respect to Figures 2, 3, 6, '7 and 9,
‘
ment of the latch tip 2353‘ against the cam sur
As this occurs, the link 2H exerts an upward
face 25! maintains the primary latch in its re
pull on the latch lever 2l8, thus resulting in a
rise once more of the latch lever and thus also 70 leased position until the tip 230 is engaged in
the notch 23L
permitting the abutment to swing back to its
‘original position.
The milled latch 25% is a shaft 3% vhaving a
portion 25c milled out, the milling being of suf
Thus the downward pressure ‘of link 2% owing
to the opening pressure of the ‘opening "spring of
?cient depth to permit the base or latch en
gaging portion 39f of the primary latch 2132 to
the circuit breaker depresses the latch lever when '
is ?rst moved downwardly as shown in Figure 9.
2,412,294
10
pass therethro'ugh when shaft 300 is rotated coun
Mil registers with a notch 403 in the lever 424
terclockwise.
when the handle 32% is in neutral position.
The extension 392 on the bottom of the pri
mary latch lies adjacent the base or latching
tip 3!!! thereof to limit the movement of the
base into the milled latch ‘250. The milled latch
and its shaft sea is normally retained and biased
Lever M34 is pivoted on the stud Hi5 and is main
tained in raised position by the spring 586 which
engages 2. lug
tom of the housing,
towards the latching position by spring 305 which
rotatably mounted in suitable
'
The position of the members of Figure 5 shows
the position of these elements when the circuit
exerts a clockwise force thereon.
Shaft 39f!
on the lever 135% and the other
end of which is engaged by a lug r363 in the bot
~ 10
hearings and carries tripping arms 304 prefer
ably of insulating material keyed thereto or
molded thereon. The spring 355 which main
tains the milled latch
suitable latching posi
tion is connected to a stud 3536 on the shaft 550'. ~
breaker handle
is rotated to close the same.
This operation results in rotation of shaft 353
clockwise with respect to Figure 5, thus causing
the roller set to ride out of notch 4633 and on
to'the upper surface of the lever fills. This ro
tates lever ass .bout the pin 6515 thus extending
The opposite end of this spring is passed through
the spring 1588.
and thereby attached to an eye in the lug 303
in the side wall of the housing.
When manual closing pressure is removed from
the handle 326 then the tension on spring 455
causes the lever
to rotate counterclockwise,
Arm 3% (see Figure 10) may also be mounted
on the shaft 359 carrying the milled latch 25!] 20 thus causing
roller as: to ride down the
and abuts against the manual tripping arm 3!!!
lever and into
notch
This results in a
which thus also limits the rotational movement
consequent rotation of arm 45% and of shaft 359,
of the shaft 329 in response to spring 355.
thus resetting the mechanism.
Milled latch 256 is of the variety generally
In the foregoing I have set forth in schematic
known as “dead center” latch wherein the force
form an operation of the circuit breaker closing
exerted by the latching tip 321 of the primary
and tripping apparatus. This apparatus is more
latch 232 does not tend to induce any movement
speci?cally described in the applications above
of the latch 253 but is substantially directed to
set forth.
ward the center thereof inducing a condition of
The present invention does not concern itself
stability.
I
vWhen the shaft 300 is rotated counterclock
wise then it need not overcome any substan
tial force tending to impede its rotation since
the only resistance to such rotation is the spring
355 which is merely su?icient to maintain the
latch in stationary position and the slight friction
between the latching tip 30! of the primary latch
and the side of a shaft 300.
directly with the operating mechanism herein de
scribed but with a lock-in device which is appli
cable thereto.
A full understanding, however, of the construc
tion and operation of the operating mechanism
of the circuit breaker is necessary to an under
standing of the operation of the lock-in device.
The lock-in device herein described and the
integration thereof with the operating mecha
Automatic tripping may be effected by the rais
nism may now be fully understood.
ing of the armature 52| of tripping coil III] to 40
Essentially, the lock-in device is arranged to
abut against the tripping arm 3% and rotate the
render the milled latch 259 ineffetcive and is fur
shaft 3% counterclockwise.
Manual tripping may be effected by a rotation
of the tripping arm 3H3 (Figure 10) clockwise
around its pin 3i l to engage the tripping arm "
399. The tripping arm 3H3 may be operated by
the lock-in device herein described.
The operating lever 25!] may be moved to cir
cuit closing position either manually or mag
netically.
,
Electrical operation is obtained by energization
of closing solenoid coil
to raise the armature
332 which engages the knee pin 255 and thus
raises operating link 20%].
Manual closing is obtained by the rotation of
handle szc. Handle 320 is keyed to the squared
shaft see which in turn is inserted in the squared
hollow portion of the cylindrical casting 352 and
held therein by a set screw.
ther arranged so that the shaft S?il is moved ax
ially so that the milled portion 25!! thereof is
moved out of engagement with the latching tip
334 of the primary latch 232. This provides an
absolute means for preventing the rotation of
the primary latch 23% clockwise with respect to
Figures 3 and 7 since it'will then be in engage
ment only with a solid shaft.
Also, the lock-in device is so arranged that the
operating link 2553 may be locked in raised posi
tion thus locking the pin 255 in raised position
so that any force which may jar the abutment
225 out of position will not have the result of col
lapsing the mechanism.
That is, the operating mechanism, as is now
understood. supports the circuit breaker contacts
in closed position by reason of the fact that pin
'
265 is supported and by reason of the fact that
Square shaft 350 is, of course, of any suitable 60 the primary latch 232 is restrained from counter
length depending on whether or not a cover or
clockwise rotation. The lock-in device of my
casing is to be used for the circuit breaker.
invention is designed to prevent counterclockwise
The cylindrical casting 352 carries thereon a
rotation of the primary latch and is designed
helical cam 353 which engages a roller 355 on
' to support the pin 2B5, irrespective of what may
a downwardly depending lug 354 of the oper
happen to the abutment 225.
ating arm 2%. On manual rotation of the han
The lock-in device is shown in the ordinary un
dle 326, clockwise with respect to Figure 4, the
locked position in Figure 10 and consists of a
helical cam 353 will raise roller 35", thus rais
cylinder 5% having two shafts 55! and 5&2 ex
ing the link 2552 and thus closing the circuit
tending from opposite ends thereof.
breaker. The handle may then. automatically re
The cylinder and shafts are preferably formed
turn to neutral position.
from a single steel casting. Each of the shafts
The means provided for causing this return
5e! and
is eccentric with respect to the cen
consists of an arm 40!! mounted on the shaft
350, the said arm carrying a roller 4!“.
Roller
ter of rotation of the cylinder 59%; that is, cylin
der 500 rotates in appropriate bearings in a hous
12
ll
ing 5&3 which is secured at one side to the princi
pal housing 3% of the operating mechanism.
In the view of Figure 10, each of the shafts ‘5M
ping of the primary latch 232 in the manner pre
viously described.
/
The normal position of the parts of Figure 1
are shown also in the front and side views of
and 5%? is directly below the center of rotation of
Figures 15 and 16.
cylinder Silt. Shafts 5&5 and 55.2 are coaxial with
The operation which effects the tripping of
each other so that whatever position shaft 5M
the latch is also shown in the front and side
may assume with respect to the mechanism, shaft
views of Figures 1-7 and 18, the position of the
will assume an exactly similar position.
parts of which correspond exactly to the posi
The cylinder 5% is maintained in a position
where it is normally forced toward the left (out .10 tion of the parts of Figure 11.
wardly) by the compression spring 585, one end
to Here
Figures
it will
11 be
and
noted,
18, particularly
that a set screw
with 52E is
of the spring being secured at 5535 in an end wall
of the housing 5%, the other end of the spring
being secured beneath the head of a screw 56%
which passes through the cylinder 50!).
The position of cylinder Elli! is ?xed by the en
gagement of the left hand member are of the
casting 5i 5 against the tripping arm sue, the
provided in the base of the housing and engage
able with a channel 522 in the cylinder 5%.
This channel consists of a circumferential
portion 52d, a longitudinal portion 525 eXtend~
ing normal to the ?rst circumferential portion,
an additional circumferential portion 523 and
an additional longitudinal portion 52?.
When the cylinder 5% is in the neutral posi~
on the pin 3| I. This position is also ?xed by the 20
tion shown in Figure 10, the head of the set
screw 52H in the channel 522 as hereinafter de
screw 52H is positioned in the channel 522' at
scribed.
the juncture between portions 521% and 525.
The casting 5M (hereinafter more speci?cally
The circumferential portion 521% of the chan
described) is secured to the right hand end of
the shaft 592 and may be integral therewith or 25 nel permits the counterclockwise rotation of the
cylinder 55%] by a handle mounted on the
welded thereto.
squared extension 5ft so that a tripping opera~
The front end of shaft 5!“ is provided with a
tion may be effected. However, rotation of the
squared extension 5l3 over which a handle may
cylinder 5% clockwise is resisted by the fact that
be mounted. Rotation of the squared extension
will result in the rotation of the shaft
and 30 such clockwise rotation brings the side of chan
nel 525 against the head of the screw 52!.
in consequent rotation of the cylinder 555i! and
Accordingly, it is normally impossible without
also in rotation of shaft 562.
any further movement to rotate cylinder 56%
Since shaft 552 is eccentric with respect to the
position of which is fixed by its being mounted ‘
center of rotation of cylinder Mill. this operation
will result in rotation of the tripping arm 3H1.
The pin 3!! which carries tripping arm 35B
is mounted directly beneath the center of rota
tion of the cylinder 5%. Accordingly, when the
squared extension 513 is rotated counterclock
wise with respect to Figure 10, thus rotating the '
cylinder 5B8 counterclockwise,’ then the rotation
of the shaft 562 also counterclockwise will result
in a clockwise rotation of the tripping arm SlO
around the pin 3! l.
This is so since the eccentrically mounted shaft
562 passes between the tines 515 and 5I6 of the
bifurcated extension ‘ill of the tripping arm 3H3.
Such clockwise rotation of the tripping arm 3H3
will cause the arm 3&9 mounted on the extension
569 of the shaft 3% to be rotated counterclock- '
wise, thus rotating the shaft Silt counterclock
wise and thus tripping the latch; that is. the
abutting portion 3%! of the primary latch 232 is
then brought opposite the milled portion 259 of
the shaft 390 and permitted to enter therein and :
trip the circuit breaker.
clockwise. However, the primary function of
the apparatus shown in Figures 10 and 11 is to
provide a lock-in for the circuit breaker which
will prevent operation of the primary latch 232
and the milled latch 259.
This function is achieved by an axial movement
of the cylinder 50!} toward the right with re
spect to Figure 10 so that the spring 5&5 is com
pressed when the handle mounted on the squared
extension 5l3 is pushed inwardly with respect to
the front of the circuit breaker mechanism (and
toward the right with respect to Figure 10). The
casting 5i i on the opposite end thereof
like
wise pushed toward the right.
The casting 5!! consists of two circular side
plates are and 536 on opposite end of a small
shaft 531. ' The side plates hit, 536 and the
shaft 53! are preferably welded together or may
be integral and the entire casting is secured to
the shaft 532 by welding the side plate Eiil on
to the end of that shaft. However, the side
plate Sill is welded to the shaft 5G2 so that a
portion of the plate adjacent to the periphery
Such an operation produces exactly the same
rotation of shaft 396 as would the automatic trip
ping mechanism which would cause the arm 3%
of shaft ass to rotate counterclockwise.
The compression spring 505 also serves as a
spring which biases the cylinder Elli) toward the
thereof engages the shaft 5%.
The arrangement is such that the small shaft
535 between the side plates 5H) and 53% is coaxial
with the cylinder 599 so that it has no eccentric
rotation with respect thereto.
A bell crank lever 535 is mounted by a suitable
angular position shown in Figure 10. Accord
ingly, upon release of manual pressure from the
vertical pin 536 in’ the housing so that it may
rotate about the pin. The arm
of the bell
crank lever has a clevis 539 at the end thereof,
the tines of which are engaged between the plates
MB and 538 on either side of the shaft hill.
The opposite arm 548 of the bell crank lever
also has a clevis 5M, the tines of which extend
on either side of the shaft 519. which is
exten~
sion of the milled shaft 368. This clevis is cap
tured between the side plate 5&5 mounted on the
shaft 5E9 and the end of the shaft 3%.
handle on the squared extension EH3, the cylin~ -'
der 5% will, after the tripping operation, re
turn to the position shown in Figure 10 and be
in position for any further operation which may
be required.
'
The tripping operation is shown in Figure '11.
Here it is seen that the squared extension 553
has been rotated counterclockwise thus rotating
the shaft 502 counterclockwise and rotating the
tripping arm 3!!) clockwise to rotate the milled
shaft 300 counterclockwise to cause the trip
Accordingly, ‘when the handle carrying exten
sion 5l3 is pushed toward the right, thus push
13
2,412,294.
ing the cylinder toward the right against the
compression of the spring, casting 5!! is also
pushed toward the right.
The engagement of plate 510 with the clevis
539 causes a counterclockwise rotation of the
bell crank lever .535. This, therefore, causes a
corresponding movement of the opposite clevis
54! of the bell crank lever and thus causes the
milled shaft 3.98 to slide toward the left. This
is made possible by reason of the fact that the
shafts M9 and 550, each constituting extensions
of the milled shaft 3&0, are rotatably positioned
in rather narrow bearings 560 and 55! (Figures
13 and 14) so that they may slide longitudinally
with respect thereto.
When the milled shaft 30!] thus is now slid to
the left (with respect to Figures 10, 12, 13, and
14) by this motion, the milled portion 253 of the
shaft is slid beyond the latching tip 353:" of the
latch lever of the primary latch 232. That is,
as may readily be seen, especially in Figures 13
and 14, the milled portion 255 of the shaft Sill!
is rather narrow in area and, in fact is just wide
14
pression spring may now, therefore, force the
cylinder 5% back (to the left) so that the inner
end of the portion 521 of the channel is engaged
by the set screw. The compression spring now
maintains a pressure at the end of channel 521
on the set screw 52L
Since the portion 521 of the channel is just long
enough to permit this locking action to take place
by reason of the action of the compression spring
and since it is not as long as the channel 525,
then the position of the members which is ob
tained by this movement of the cylinder 5G0 axi
ally is held as long as the cylinder is left in the
position shown in Figure 12. Further, since spring
555 is also a torsion spring (exerting its force in
a clockwise direction) it assists in holding cyl
inder 582 in the position of Figure 12.
In Figures 13 and 14, I have shown top views
of this operation; Figure 13 corresponding to the
position of Figure 10 and Figure 14 corresponding
the position of Figure 12.
Here it will be seen that the shaft extensions
5H) and 55%! are slidable in the bearings 568 and
555 which are supported by the walls of the hous
enough to permit the primary latch 232 to enter
therein. When the shaft 30!! and the members 25 ing 3i .
carried by it are moved to the left, then the
The front and side views Figures 19 and 20 cor
milled portion (250 of the shaft is moved away
respond to the position of the members in Fig
from engagement with the latching tip Bill of the
ures l2 and 14.
primary latch 232. The primary latch 232 can
This operation, while it results in rendering
not, therefore, under any circumstances, enter
into the milled portion and is ?xed against ro
tation by its engagement with the unmilled por
tion of the shaft.
No tripping movement which is imparted to
the shaft 3% could in any way cause the pri
latch to enter the milled portion of the
shaft.
Furthermore, any tripping movement
the tripping latches 255 and 232 absolutely inop
erative, may, in certain circumstances, however,
not be suticient to ensure the maintenance of
the circuit breaker in closed position against any
shocks or jars.
I provide, therefore, additional members on my
lock-in and operating mechanism which will also
serve to hold the operating link 2053 in raised
which may be imparted to the shaft 3% by an
position irrespective of any shocks or jars which
armature which strikes the arm 334 will, never
may accidentally move the abutment 225 out of
theless, rotate the shaft 353 without eifecting an 40 supporting position.
opening of the circuit breaker.
When the operating link 2% is thus held in
In this manner, many difliculties in the prior
raised position and when the milled shaft 398 is
art are obviated, since the members which are
moved so that the milled portion 259 thereof can
engaged by the tripping armature may yield with
not be entered by the primary latch 232, then
respect thereto when the trip coil is energized.
45 the only factor which may result in opening the
Thus the arm
of the milled latch will be
circuit breaker is some structural defect in any
engaged by the tripping armature (under fault
of the links.
conditions) and rotated thereby to rotate shaft
My circuit breaker operating mechanism, how
3% without, however, tripping the circuit breaker.
eve ‘, has been designed so that each of the links
This is so, particularly since the shaft 360 may 50 is formed not merely from a single plate but from
rotate in response to any tripping movement
a plurality of plates tied together and rigidi?ed
while when the lock-in is effective, the milled
by the tie plates so that the structure thereof is
portion
thereof is not brought into position to
able to resist the physical shocks which may be
effect the opening of the circuit breaker.
directed against it.
When the cylinder 5% has been moved axially 55
As seen in Figure 3, closing of the circuit
the manner herein described, it is necessary
breaker is effected by rotating the handle 32% to
to lock the same so that it cannot be moved out
the position shown in Figure 3 in order to raise
of position by the compression spring 535 and
the operating link 2%.
so that it cannot be jarred out of position.
The operating link 28% is held in raised posi
The locking movement consists of a subsequent 60 tion at this time by the fact that the roller 355
rotation of cylinder 5%. Thus, when the cyl
carried thereby is engaged with the helical cam
?nder
is moved to the right with respect to
on the cylindrical casting 352 which the
Figure 18, the head of the set screw 52! may slide
handle of shaft 359 engages.
down the portion 525 of the channel 522.
As long as the members are in the position
At this time, when it reaches the end of this
shown in Figure 3, then the helical cam 353 sup;
.tlon of the channel, then it is free to be moved
ports the roller 355 and prevents the operating
along portion
of the channel. Consequently,
link
from dropping down.
after the axial movement is effected, then the
Normally the members shown in Figure 5 (pre
handle of the squared extension 5H3 is rotated
viously described) are designed to rotate the han
clockwise to the position shown in Figure 12 and 70
die to neutral position after the pin 205 on the
the sad of the set screw 52! passes down the
operating link is engaged by the abutment 225.
portion 26 of the channel until it reaches the
portion 521 thereof.
The portion 52'! of the channel is shorter than
the portion 525 of the channel 522. The com
When, however, the handle is held in the posi
tion shown in Figure 3, then the helical cam 353
abuts against the roller SE5 and thus prevents
the operating link 22% from descending, even
2,412,294
15
16
where an unmilled portion thereof engages the
though the abutment 225 may be swung out of
latch tip affects the positive look.
the way.
In milled latches of the type herein used, there
Accordingly, my lock~in device is designed to
is only a very small area of the shaft in engage
maintain the cylindrical casting $52 in the po
ment with a correspondingly small area of the
sition shown in Figure 3 so that the helical cam
latch which prevents the entry of the latch into
will engage the roller 355 when the operat
the milled portion. This is su?icient for nor
ing link is raised and thus prevent the operat
mal operation.
ing link from descending even though the abut
An extreme physical shock such as may occur
ment 225 may be jarred out of position.
For this purpose a lever 5% (Figures l0, l2, 10 in the case of gun ?re may, however, wear or
break the metal su?iciently to permit the trip
and 19) is provided. This lever is preferably
ping action to occur. By moving the milled
made integral with the squared handle shaft 35%
shaft so that an unmilled portion thereof en
and is provided with a hook ‘5i’ i.
gages the latch tip, then the full structural
The
shaft 351’! and the lever Eli‘: are ro~
strength of the entire shaft is utilized to with
tatecl clockwise with respect to these ?gures when
stand the shock and it becomes physically im
the circuit breaker is moved to closed position.
possible for a tripping action to occur.
At this time the lever bid is moved to a hori
Likewise, since the abutting element 225 is held
zontal position as shown in Figures
and 19
in position by a spring, a physical shock or jar
where the hook is moved to a position opposite
may conceivably move it to a position where it
a hook 585 operable by shaft 59 5.
will be disengaged. A sequence of fortuitous cir
Hook 5% is mounted on a locking plate 5M
cumstances which may produce this effect may
which is rotatably mounted on the pin 382.
at first seem inconceivable since the abutment
Plate Pitt is bifurcated at 583 and. the tines
is prevented. from rotating counterclockwise with
58:3 and 535 surround the shaft 5%} i.
respect to Figure 3 by reason of its engagement
When the handle is rotated clockwise to close
with the tie-plate 221 of the latch lever 2H8; and
the circuit breaker, then, in order to utilize the
further since its rotation clockwise Would re
lock-in device to its fullest extent, the handle
quire it to raise the pin 2515i and thus raise the
at the completion of the closing movement is
pin 259 to compress the main contacts even fur
held horizontal so that the lever ?le is in the
horizontal position shown in Figures 12 and 19. 30 ther while the opening spring is rendered ine?ec
tive by the support given by the latches to the
At tl ‘s time, the cylinder 58% is moved axi»
lever 3313.
ally by pressing the handle mounted on the ex
But, since the shocks attained by recoil or im
tension 513 inwardly. This results in the look
pact in the case of gun ?re are for the most part
ing of the tripping latch in the manner previously
immeasurable and at times of inconceivable force,
described.
even the possibility of the movement of the abut
After the cylinder too has been moved to com
ment 225 out of position is provided for by the
plete its axial movement, it is then rotated clock
positive support for the operating link 2% herein
wise in order to e?ect the locking thereof in
set forth.
the manner previously described.
The lock-in device itself is rendered shock
This clockwise rotation, of course, rotates the all)
proof by the plurality of movements which are
shaft 5M in the same direction. Since shaft 5535'
required in order to unlock the circuit breaker.
is eccentric with respect to the center of rota
For this operation it is necessary (referring to
tion of cylinder 5%, rotation thereof results in
Figure 12) once more to push the handle carry
a counterclockwise rotation of the locking plate
’ ing extension 5 i3 inward against the compression
53! around its pin 382.
of spring 5&5, then to rotate the handle carrying
Consequently, the hook 586 engages the hook
extension and the cylinder to a position where
HI and maintains the lever 575 in horizontal
the spring may push the cylinder out once more.
position and thus maintains the handle and op
While it may be conceivable that the shock of
erating members in the positi n shown in Fig
gun ?re might cause the cylinder sec to vibrate
ure 3 where the helical earn 3555 supports the '
axially against the pressure of the compression
roller-‘355 of the operating link and prevents the
spring 556, it is inconceivable that such a shock
same from tripping.
would produce the complex action herein required
In this way, therefore, even though the abut
where the unlocking movement requires ?rst an
ment 225 should be jarred out of position, there
axial movement against the force of the com
is no effect on the operating arm Edit, since it is
pression spring and then a rotational movement
supported by the engagement of hook
with
against the torsional resistance of spring 555.
hook 5,?! which maintains the helical cam in
Further, the cylinder is held in lock-in position
supporting position.
by the interengagement of hooks 5H and 589 on
It may be noted that this device makes pos
sible the use of the lock—in mechanism to effect 60 members are and 58!.
Accordingly, the lock-in device of the present
a tripping of the circuit breaker since it con
invention not only prevents electrical fault con
tains parts which may readily be used to effect
ditions and physical forces from tripping the cir
such a tripping action as described in connec
cuit breaker but is itself shock-proof.
tion with Figure ii. The necessity for other
In the foregoing, I have set forth my invention
manual trip-ping members which may otherwise
and described its operation thereof in connection
have been used is dispensed with.
with preferred embodiments thereof. Many vari
Essentially, however, the lock-in device is de
ations vrltl'un the spirit of the disclosure should
signed to maintain the circuit breaker in closed
position irrespective of any physical jars, shocks
now be obvious to those skilled in the art. Ac
or electrical overload to which the circuit breaker 70 cordingly, I prefer to be bound not by the specific
disclosures herein but only by the appended
may be subjected.
claims.
Since, in this case, the tripping of the cir
cuit breaker depends on the movement of a
I claim:
,
i. In a circuit interrupter having a movable
milled portion of a. shaft into registry with a latch
contact structure engageable with a comple~'
tip, the movement of the shaft to a position
2,412,294
mentary contact; means biasing said movable
contact structure to open position; operating
means for moving said movable contact struc
ture into engagement with said complementary
contact; means for retaining said movable con
tact structure in engagement with said com
plementary contact; a releasing means having a
18
also comprising a portion whose cross~section is
circular for maintaining said retaining means in
operative position, said last mentioned circular
portion being registerable with said retaining
means in said second position; and a locking
device for moving said releasing member‘ from
said ?rst position to said second position; said
?rst and .- " "end position, operable to release
releasing member being rotatable in each posi
said last
_ed retaining means when oper
tion thereof; said circular cross section portion
ated in response to predetermined circuit condi 10 on said releasing member when said releasing
tions when in its ?rst position with respect to
member is in said second position being in oper
said retaining means, and ine?ective when oper
ative engagement with said retaining means irre
uted in response to predetermined circuit condi
spective of the angular position of said releas
tions to release said retaining means when in its
ing member; said locking device also engaging
second position with respect to said retaining
said operating means to lock the same in closed
means; and means for moving said releasing
contact position.
means between said ?rst and second position.
2. In a circuit interrupter having a movable
contact structure engageable with a comple
5. In a circuit interrupter having a movable
contact structure engageable with a complemen
mentary contact; means biasing said movable 20 tary contact; means biasing said movable con
tact structure to open position; operating means
contact structure to open position; operating
for moving said movable contact structure into
means for moving said movable contact struc
engagement with said complementary contact;
ture into engagement with said complementary
means for retaining said movable contact struc
contact; means for retaining said movable con.
ture in engagement with said complementary
tact structure in engagement with said comple
mentary contact; a releasing means having a “ contact; releasing means operable to release said
last mentioned retaining means; and a locking
?rst and a second position, operable in response
device engageable with said releasing means to
to predetermined circuit conditions to release
render the same ineffective, said locking device
said last mentioned retaining means when in its
comprising a cylindrical shaft, said shaft being
?rst position with respect to said retaining means,
slidable longitudinally between a non-locking po
and ineifective when operated in response to pre
sition and a locking position; said cylindrical
determined circuit conditions to release said re
shaft preventing the release of said retaining
taining means when in its second position with
means when said shaft is moved to a locking posi
respect to said retaining means; and means for
tion; and additional means associated with said
moving said releasing means between said ?rst
cylindrical shaft for maintaining said shaft in
and second position, said last mentioned means
said locking position.
comprising members operable to lock said releas
6. In a circuit interrupter having a movable
ing means in said second position.
contact
structure engageable with a complemen
3. In a circuit interrupter having a. movable
contact structure engageable with a comple 40 tary contact; means biasing said movable con
tact structure to open position; operating means
mentary contact; means biasing said movable
for
moving said movable contact structure into
contact structure to open position; operating
engagement with said complementary contact;
means for moving said movable contact struc
means for retaining said movable contact struc
ture into engagement with said complementary
ture in engagement with said complementary
contact; means for retaining said movable con
contact; releasing means operable to release said
tact structure in engagement with said comple
last mentioned retaining means; and a locking
mentary contact; a rotatable releasing member,
device engageable with said releasing means to
having a ?rst and a second position, operable to
render the same ine?ective, said locking device
release said last mentioned retaining means and
comprising a cylindrical shaft, said shaft being
means for rotating the same to effect opening of
slidable longitudinally between a non-locking
said circuit breaker; said rotatable releasing
position
and a locking position; spring means
member comprising a latching portion register
engaging said shaft and urging the same to non
able With said retaining means in said ?rst posi
locking position; said cylindrical shaft prevent
tion and also comprising means for maintain
ing
release of said retaining means when said
ing said retaining means in operative position,
shaft is moved to a locking position, said shaft
said last mentioned maintaining means being
being rotatable on its own axis; means for rotat
registerable with said retaining means in said
ing
said shaft in a predetermined direction when
second position; and a locking device for mov
the same has been moved to a locking position;
ing said releasing member from said first posi
a groove in said shaft, a stationary member reg
tion to said second position.
istering with said groove; said groove having a
4. In a circuit interrupter having a movable
longitudinal course on said shaft; said stationary
contact structure engageable with a complemen
member registering with one end of said groove
tary contact; means biasing said movable contact
in the non-locking position of the shaft and with
structure to open position; operating means for
the opposite end of the groove in the locking
moving said movable contact structure into en~
position of the shaft; said groove also hav
gagement with said complementary contact;
ing a circumferential course communicating with
means for retaining said movable contact struc
said longitudinal course at said opposite end;
ture in engagement with said complementary con
said stationary member entering said circum
tact; a rotatable releasing member, having a ?rst
ferential course when the shaft is rotated in a
and a second position, operable to release said 70 predetermined direction after the locking posi
last mentioned retaining means and means for
tion is reached.
rotating the same to effect opening of said cir
7. In a circuit breaker having a pair of coop
cult breaker; said rotatable releasing member
erating contacts which engage and disengage,
comprising a milled portion registerable with
means responsive to circuit conditions for oper
said retaining means in said ?rst position and
ating said contacts to disengaged position, means
‘2,412,294
"it
20
for manually engaging said contacts, manually
operable means for e?ecting disengagement of
said contacts, locking mechanism for locking said
contacts against disengagement by said ?rst men
'
ating said contacts to disengaged position, man
ually operable means for disengaging said con
tacts, a locking mechanism having a linear move
ment to a plurality of predetermined positions
tioned means, said locking mechanism having a Cl in one of which it is effective for locking said
contacts against disengagement by said ?rst
p-luraiity of set positions, an operating member
mentioned means, an operating member having
having a plurality of set positions for operating
a plurality of set positions for operating said
locking mechanism to each of said posi
locking mechanism to each of said positions, and
said operating member being movable axi
ally to operate said locking mechanism to its 10 means whereby said manual operating, member
is ineffective until said locking mechanism has
operative position for loclnng said contacts in
?rst been rendered ineffective.
engagement, said operating member being also
12. In a circuit breaker having a pair of co
operable to operate said contact disengaging man
ual means.
In a circuit breaker having a pair of coop
operating contacts which engage and disengage,
15 means responsive to circuit conditions for oper
ating said contacts to disengaged position, a
erating contacts which engage and disengage,
locking mechanism having a linear movement
means responsive to circuit conditions for oper
to a plurality of predetermined positions in one
ating said contacts to disengaged position, a lock
of which it is effective for locking said contacts
ing mechanism having a linear movement to a
pluraiity of predetermined positions in one of 20 against disengagement by said ?rst mentioned
means, an operating member for operating said
which it
effective for locking said contacts
locking mechanism to each of its positions, and
against tripping by said ?rst mentioned means,
means controlled by said operating member to
an operating member having a plurality of set
positions for operating
locking mechanism
to each or" said positions, said operating member
being movabie axially to operate said locking
mechanism to its operative position and means
cont lied by said operating member for look
ing
contacts
tripping
said ?rst
mentioned means.
9. In a circuit breaker having a pair of co
operating contacts which engage and disengage,
means responsive to circuit conditions for oper
ating said contacts to disengaged position, means
disengage said contacts.
13. In a circuit breaker having a pair of co
operating contacts which engage and disengage,
means responsive to circuit conditions for oper
ating said contacts to disengaged position, a
locking mechanism for locking said contacts
against disengagement by said ?rst mentioned
means, toggle mechanism controlled by said ?rst
mentioned means for controlling the disengage
ment of said contacts and means controlled by
said locking mechanism for locking said toggle
for manually engaging said contacts, manually 35 against collapse.
operable means for eiiecting disengagement of
14. In a locking mechanism for an electric
switch having relatively movable cooperating
said contacts, locking mechanism for locking said
contacts provided with actuating means for ef
contacts against disengagement by said ?rst
fecting a circuit closing movement thereof to
mentioned means, said locking mechanism hav
gether with means for holding the contacts in the
ing a plurality of set positions, an operating
circuit closing position; a movable member for
member having a rotary and axial movement for
effecting the release or said holding‘ means, and
passing between a plurality of set-positions, the
means controlled by said member upon move
axial movement of said operating member oper
ment thereof to a predetermined position for
ating said locking mechanism to its positions,
for locking said contacts in engagement against 43 preventing the release of said holding means;
15; Ina locking mechanism for an electric
disengagement by said ?rst mentioned means,
switch having relatively movable cooperating
said operating member being rotatable to Oper
contacts provided with actuating means for ef
ate that said manually operable contact disen
easing means.
.
10. In a circuit breaker having a pair of co
operating contacts which engage and disengage,
means responsive to circuit conditions for oper
ating said contacts to disengaged position, look
fecting a circuit closing movement thereof to~
gether with means for holding the contacts in
the circuit closing position, a movable member
for effecting. the release of said holding means
and means controlled by said member upon
movement thereof to a predetermined position
for preventing the separation of said contacts.
16. In a locking mechanism for an electric
switch having relatively movable cooperating
contacts provided with actuating’ means for ef
fecting a circuit closing movement thereof to—
mechanism to each of said positions, said oper
ating member being movable axially to operate 60 gether with means for holding the contacts in the
circuit closing position; a movable member for
said locking mechanism to its operative position
effecting the release of said holding, means and
for locking said contacts against disengagement
means controlled by said member upon move
by said ?rst mentioned means, said operating
ment thereof to a predetermined position for
member being rotatable and locked at said ax
preventing the release of said holding means
ially moved positions.
and to another predetermined position for pre
11. In a circuit breaker'having a pair of co
venting'the separation of said contacts.
operating contacts which engage and disengage,
WILLIAM M. SCOTT, JR.
means responsive to circuit conditions for oper
ing mechanism for locking said contacts against
disengagement by said ?rst mentioned means,
said locking mechanism having a plurality of set
positions, an operating member having a plu
rality of set positions for operating said locking
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