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Патент USA US2121441

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June 21, 1938.
K. RQNISBET
2,121,441
CIRCUIT BREAKER
Filed Nov. ‘21, 1936
s Sheets-Sheet 1
FIG- 2. a
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W (2,iNvENTéR.
mam
June 21, 1938.
K. R NlsBET
2,121,441
C IRCUIT BREAKERv
Filed Nov. 21, 1936
3 Sheets-Sheet 2
mwuik, QM
'
\NVLNTOR
Patented June 21, 1938
UNITED STATES PATENT OFFICE
2,121,441
CIRCUIT BREAKER Kenneth R. Nlsbet, Washington, D. 0.
Application November 21, 1936, Serial No. 112,151
11 Claims.
(Cl. 200-116)
This invention relates to a circuit breaker oi’
moderate rating, suitable for use in the control
Fig. 11 is an alternate form of a bimetallic
thermal element.
of lighting circuits and comparatively small
Fig. 12 is an alternate form of contact between
power applications and that is automatically op- . the thermal element and the circuit breaker re
erable to an open position upon overload, man
ually operable to either an opened or closed
position, and has for an object a unit that is
small and relatively inexpensive.
leasing device.
tacts.
Another object of the invention is to provide a
circuit breaker more compact than any hereto
fore available and one that can be utilized'in
connection with standard single type switch out
_
Figs. 13 and 14 are drawings in part showing a
multi-pole circuit breaker having separable con
'
‘
By reference to Fig. 1, the numeral l represents
a standard sectional conduit type outlet box, 10
commonly used for wall switches and receptacles,
let boxes, standard ganged boxes, standard gang
in which the circuit breaker is installed. The
use of this particular type of outlet box is not
boxes with plaster covers or with special boxes
15 if such is to be desired.
restrictive inasmuch as the common switch boxes
Another object of the invention is to provide a‘
circuit breaker that is interchangeable with many
types of tumbler switches already installed, and
one that is operated as a tumbler switch in that
20 there is no neutral position of the operating
handle, with the attendant disadvantagesthereof.
25
A still further object of the invention is to
provide a circuit breaker having inverse time
overload trip characteristics with the advan
tages of an ordinary tumbler switch thus com
bining some'of the merits of both.
Other objects and advantages of the invention
will be apparent in the description following here
inafter.
With reference to the accompanying drawings:
Fig. 1 is a plan view, partly in section, of the
circuit breaker installed within an ordinary sec- ‘
tional type flush mounted outlet box. '
Fig. 2 is an elevation taken along line a—a 01'
Fig. 1, showing the circuit breaker in the closed
position.
Fig. 3 is a part elevation, showing certain ele
ments of Fig. 2, with the circuit breaker in the
normal opened position.
Fig. 4 is an isometric drawing of the carrier
assembly drawn to a larger scale, in a position
approximately midway between the opened and
closed positions, drawn for the purpose oi’ clari-"
?cation.
Fig. 5 is a section thru Fig. 4, with the side
plates and spring members added.'
Figs. 6 and 7 are part sections thru the oper
ating and contact carrier heads showing the rela
tive positions of the pawl, in thecircuit breaker
~ opened and closed positions respectively.
Figs. 8 and 9 are part plan views of the oper
ating and carrier heads respectively.
'
Fig. 10 is an isometric drawing‘oi the trip and
55 terminal assembly.
or ?ttings in general usage can be utilized equally 15
as well, which includes gang and gangable switch
boxes or special boxes. The mechanism is con
tained within housing 2, having paper or fibre
insulation 2a over the top, which is constructed
of an insulating material and which has one my
removable side 3 for assembly purposes. The
housing is secured to the outlet box and covered
in a manner similar to that used for ordinary
tumbler switches, by means of yoke l and cover
plate 5. The mechanism is in general supported 25
in a ‘frame 8 consisting essentially of stop bar 1,
pin 8, shafts 9, III, II, and two identically con
structed side plates’, only one 12 of which is
shown on the drawings, the other side plate l3
being similarly located with respect to the hori- 30
zontal axis and is so designated in Fig. 2.
It is to be noted that pin 8 extends into-both
sides of housing 2 thru side plates I2 and I3, to
form a pivot for frame 6 which has a small
angular movement, to be described hereinafter. 35
It should also be noted that stop pin it and
trip pin [5 extend into both sides of housing 2
and are rigidly secured in place.
The carrier assembly shown in Figs. 4 and 5
consists of two units, one an operating carrier 40
it‘ having a radially curved head ll, a supporting
leg IS, the end of which is formed to provide a
means for an axis to coincide with that of head
H, the said end being provided with a guide 19
mechanically secured thereto, one edge of said .
end being cut away or otherwise formed to pro
vide catch 20 which is utilized in connection with
the tripping mechanism as covered hereinafter.
Head I‘! has operating handle 2| mechanically
secured thereto and which is of an insulating 50
material, the mechanical attachment likewise
furnishing the means of support for spring 22
which is biased to the curvature of head l'l to
hold pawl 23 in a normally closed position. Pawl
23 is movable with shaft 24 which in turn is
2
2,121,441
supported by bearings 25 and 28 formed by pro
iections from head i1. The other unit of the
carrier assembly is contact carrier 21 which has
a radially curved head 23 but of a smaller radius
than that of head l1, and formed in a manner
such that one operates within the other, a sup
porting leg 23, which is drilled to support the
electrical contacts as described hereinafter, and
has its end similarly formed but in the opposite
10 manner to catch 20, to provide catch 38, and has
guide 3| mounted thereon. Fig. 5 is a cross-sec
tion of Fig. 4, at right angles thereto, and shows
the relative positions of plates l2 and I3 to oper
ating carrier l6 and contact carrier 21. Spring
15 elements 32 and 33 are mounted about their re
spective guides I3 and 3|, their outer ends being
secured to plates i2 and I3, their inner ends
being in contact under tension to legs l8 and 23
thereby biasing both operating carrier i5 and
20 contact carrier 21 to their normal positions in
which the circuit breaker is open. Washer 34
is merely a separating means and an assistant
for maintaining alignment of its adjacent parts.
Shaft 9 is the common support for carriers l6
25 and 21.
Part plan views of ‘the pawl ends of heads l1
and 23 are shown in Figs. 8 and 9 respectively.
Head I1 is projected on both sides, which pro—
jections are formed to provide bearings 25 and
30 28 while the top inner edge 35 is flat beveled to
form a bearing surface for the extreme tip of
pawl 23. Head 28 has a longitudinal slot 38 near
the end with a rounded or beveled portion 31
between the slot and the end.
35
To open the circuit breaker manually, the fol
lowing operation is described, with particular ref
erence to Figs. 2, 4 and 5:-—A counterclockwise
force is applied to handle 2| which force is trans
mitted thru leg l8 to shaft 8 thence to frame 8
thru side plates l2 and I3. The aforesaid force
acting thru the described linkage causes frame 5,
with all its subioined parts, to rotate counterclock
wise thru a small angle about pin 8 against thebias
of spring 38. In this angular movement, projec
45 tion 38 of latch-lever 48 is brought into contact
with trip pin I5, which being stationary within
housing 2, causes the aforesaid latch-lever 40
to rotate about its shaft H) which movement in
turn causes tip 4| to be tripped from catches
50 23 and 38 thus releasing both the operating car
rier l8 and contact'carrier 21 which being under
bias from springs 32 and 33 quickly rotate to
their normally open position as shown in Fig. 3.
Mercury contact element 42 being secured to leg
55 23 is tilted to an of! position whereby the mercury
43 within the container flows by gravity away
from electrodes 44 and 45, thus breaking the
electrical circuit. In the first part of this opera
tion as operating carrier l6 and contact carrier
21 are tripped, frame 8 is returned to its normal
position with side plates 12 and _i3 in contact
with stop pin l4, by virtue of the tension in
spring 38.
-
Fig. 10 shows the relative positions of the trip
65 and terminal assembly, consisting essentially
of thermal element 48, latch-lever 48 on its
shaft l0, spring member 48, trip pin l5, ter
minals 45b, 48c and 48d. The action is de
scribed as follows: Current from the external
70 source enters the assembly thru wire terminal
48c, ilows thru both legs of thermal element
48 to terminal 48d thence by ?exible connectors,
which are not shown, to the mercury contact
element, thence back to wire terminal 46!) to
75 complete the circuit. If the current is ex
cessive, the free end 45a ‘is de?ected which
movement is transmitted thru insulator 41 to
rotate latch-lever 40 on or about its shaft in,
to trip the circuit breaker as described elsewhere
herein. Spring member 48 normally holds latch
lever 40 approximately parallel to thermal element 46.
Automatic operation of the circuit breaker due
to excessive current takes place in the following
manner, reference being made to Figs. 2, 3 and 10
4: Current in excess of a predetermined figure
thru bimetallic element 45 causes the free end
480. to de?ect in the usual manner. This move
ment is transmitted thru insulating pin 41 to
projection 48 of latch-lever 40 thereby rotating 15
the same on or about its shaft in against the bias
of spring element 49 moving tip 4| from faces
28 and 38 thereby releasing operating carrier
18 and contact carrier 21 to their open positions
as noted hereinbefore. Mercury contact element 20
42 being secured to leg 28 of contact carrier 21
breaks the electrical circuit in the manner noted
above. The circuit being thus interrupted, cur
rent ceases to flow and thermal element 46 grad
ually resumes its normal position due to the
cooling effect. In the tripped position of the
circuit breaker, projection 33 of latch-lever 48
is in contact with the radially curved ends of
legs I8 and 28 and is under bias from spring
element 49. It is to be noted that ‘with the cir 80
cuit breaker in the tripped position, projection
58 of latch-lever 48 is in a position to strike pro~
Jection 5| of pawl 23 upon reclosure of the cir—
cuit breaker unless the free end 46a of thermal
elementv 48 is in its normal position, thus pre 35
venting immediate reclosure following a severe
overload.
Fig. 6 shows the relative positions of pawl 23,
heads i1 and 28 when the circuit breaker is
open. Upon the approach to the open position,
contact carrier 21 is first stopped followed by
operating carrier is as their respective heads
28 and I1 strike stop bar 1, as noted in Fig. 3.
Pawl 23 moves with head I1 by virtue of its
mounting, and projection 52 being biased by 45
spring 22 impinges and rides over rounded sur
face 31 falls into slot 36 and thereby engages
head 28 which in turn causes carrier Hi to be
latched to carrier 21 for the closing operation.
To close the circuit breaker, a clockwise force 50
is applied to operating handle 2| to move carrier
I8, hence carrier 21, hence mercury contact ele
ment 42 in the same direction about shaft 8.
With thermal element 48 in its normal position,
the above described rotation is continued until 55
portion 53 of pawl 23 strikes stop pin H which
action rotates pawl 23 to release head 28, hence
carrier 21, permitting the motion of said carrier '
21 to, be reversed, which reverse motion is ar
rested as tip 4| engages face 38. Upon the re~ 60
lease of handle 2i, carrier l8 moves counter
clockwise thru a small angle until face 20 is
similarly engagedv by tip 4|.
element
mercury
to close
ment 45
Mercury contact
42 now being in a horizontal position,
43 surrounds both electrodes 44 and 45 65
the electrical circuit. If thermal ele
is in an abnormal position, projection 58
interferes with the clockwise motion of pawl 23,
trips the same as projection 5| strikes projection
58 which prematurely releases head 28 hence 70
carrier 21 hence mercury contact element 42
to prevent reclosure of the circuit breaker elec
trical contacts.
Fig. 7 shows the relative positions of pawl 23,
heads l1 and 28 when the circuit breaker is 75
3
2,121,441
closed. It is to be noted that the said heads
I‘! and 28 are disengaged as projection 52 rests
upon surface 3'! beyond slot 36.
It is to be noted that by the use of mercury
contact element 42, the circuit breaker is suc
cessfully operable only when installed in a ver
tical position. To avoid this requirement, I pro
pose to utilize separable contacts in lieu of the
said mercury contact element, for single or multi
10 pole service, as is indicated in Fig. 13. The use
of such separable contacts will permit increased
current ratings thus permitting a wider range
of the circuit breaker utilization.
The design, type and location of spring member
15 38 is that of 'a preferred example but it is not to
ceive the motion of either one or all said ther
mal elements upon an electrical overload. Sta
be so restricted as to exclude the use of another
tionary contacts 16, ‘I1 and 18 extend thru hous
member of different design, type or location to
serve the same purpose, that of maintaining
frame 6 in its normal position within housing 2.
The U-shaped bimetalic' thermal element 46
noted in Fig. 10 is not necessarily that of a pre
ferred example inasmuch as an elongated element
of the bar type, or one of the type indicated in
Fig. 11 may be utilized, with modi?cations in the
wire terminal arrangement on housing 2.
It is not intended that the curvature of tip 4|
or the angularity and respective lengths of catch
faces 20 and 36 be restricted to the design shown
on the drawings inasmuch as with modi?cations
thereof and with consideration given the lengths
of the lever arms and spring members involved,
the sensitivity of the tripping arrangement can
be reasonably governed, an important factor
when dealing with comparatively low current
13 Cl values.
Fig. 11 shows an alternate form of a bimetallic
thermal element consisting of an elongated por
tion of thermostatic metal or of dissimilar metals
generally utilized for such purposes, having a ter
40 minal means 54 at each end. A raised portion
55 is provided along the center line of the ele
ment, in order to add rigidity to the unit, which
may be formed in either of the metals or both.
Latch-lever element 40 is constructed prefer
ably of an insulating material but is not to be
so restricted inasmuch as it may be of metal
of a slightly different form.
Insulating pin 41 may be eliminated by incor
porating its function in another projection 41a
to latch-lever 40 as is indicated in Fig. 12, which
. serves to eliminate any intermediate element be
tween latch-lever 4'0 and thermal element 46.
Figs. 13 and 14 show a part assembly of a
multi-pole circuit breaker in which the various
elements covered hereinbefore are incorporated‘
but with modi?cations that are covered in the
following description.
The assembly as indi
cated is based upon the same fundamental op~
crating principles for manual and automatic op
60 eration, having a movable frame, operating car
end of spring member 65 on the other end of
which is secured insulator 66 which has mounted
thereon contacts 61, 68, 69 arranged to provide
wire terminals for the ?xed ends of thermal
element terminals 10, ‘H and 12, the latter not
being visible in the drawings, by means of ?exible
conductors 13, there being one such per thermal
element. Insulating barriers 14 are provided be
tween adjacent pole terminals and one bar type
thermal element 15 is provided per pole. Latch 10
lever 16 has secured thereto, or an integral part
thereof, plate 1'! which extends across the free
ends of all thermal elements 15 in order to re
ing 56 to provide one set of wire terminals 19.
Flexible conductors 80 connect the free ends of
thermal elements 14 to the other set of wire
terminals 8|.
,
ually or automatically, so far as linkages of me
chanical parts are concerned, is as described
hereinbefore. Automatic operation from a. closed
to an open position is described in part as fol 25
lows: Current in excess'of its rating will, in one
or more thermal elements ‘#5 either individually
or collectively, cause the same to deflect against
plate 11 thus rotating latch-lever .16 on or about
shaft 82 which trips legs 58 and 59 to their 30
normally biased positions, thereby quickly rotat
ing block 64, spring member 65, insulator 66 with
contacts 61, 68, 69 all in a counterclockwise
direction thus breaking the electrical contact
with stationary contacts ‘I6, ‘l1, 18 to interrupt 35
the electrical circuit.
Spring member 65 is so utilized with the forms
of contacts noted to permit some latitude due
to the movement of the frame in the manual
opening operation. With knife contacts in lieu 40
of buttons, block 64, member 65 and insulator
66 may be of unit construction or member 65
may be rigid.
It is to be understood that the forms of this
invention herewith shown and described are to 45
be taken as preferred examples of the same, and
that various changes in the shape, size and ar
rangement of parts may be resorted to without
departing from the spirit of the invention or the
scope of the subjoined claims.
50
Having thus described the invention, I claim:
1. In a device of the class described in com
bination, a means responsive, to a predetermined
circuit condition for interrupting a circuit and
manually operable to either close or interrupt
said circuit, consisting of an insulating housing;
a movable supporting member; an operating ele
ment; a switch element; a releasable latch ele
ment for connecting said operating element to
said switch element thru the closing cycle; a. 60
means ?xed to said housing for tripping said
latch element; a separate biasing means for
each item listed above, that is to say, the sup
switch element, and the latch element; a releas
' connection with standard gang outlet boxes or
able latch-lever element for locking said operat
lating housing 56, side plate 51, operating car
rier leg 58, contact carrier leg 59, biasing means
guides 60 and 6|, stop bar 62, frame pivot pin
63,‘ and latch-lever 16, other parts and numerals
being omitted in order to simplify the drawings.
To leg 59 is mechanically secured an insulat
75 ing block 64 which serves as a support for one
20
Operation of the circuit breaker, either man
rier and contact carrier elements, trip assembly,
, latching elements, pins, stops, shafts and hous
ing similar in functions to these previously
described but modi?ed for a multi-pole arrange
65 ment with separable contacts and to be utilized in
ganged single boxes or with special boxes.
The basic elements noted consist of an insu
15
porting member, the operating element, the
65
ing element and said switch element in a closed
position; a biasing means for said latch-lever
element; the said latch-lever element being piv
oted and releasable by a, fixed means1 to rotate 70
the said element about its axis in the manual
opening operation and by a thermal element in
the automatic operation, the said latch-lever ele
ment having two projections, one one either side
of its said axis to provide for the'said rotation 75
2,121,441
4
and still another projection arranged to intercept
means embodying a biased releasable latch for
retaining both said operating means and said
switch member in the closed position; a bimetal
said releasable latch element to prevent reclosure
unless the said thermal element is in approxi
mately its normal position; the said switch ele
lic thermal element for operating said tripping
ment having a means for mounting one or more
means.
contacts thereon.
2. In a device of the class described in com
bination, a means responsive to a predetermined
circuit condition for interrupting a circuit and
10 manually operable to either close or interrupt
said circuit, consisting of an insulating hous~
ing; a movable supporting frame; an operating
element; a switch element; a releasable latch
element for connecting ‘the said operating ele
ment to the said switch element thru the clos
ing cycle; a ?xed means for tripping said latch
element, the said means being fixed to said
housing; a biasing means for each oi",--the
said frame, the said operating element, the said
20 switch element, the said latch element; a re
leasable latch-lever element for locking said op
erating element and said switch element in a
closed position; a biasing means for said latch
~lever element; the said latch-lever element being
25 pivoted and releasable by a means ?xed to said
housing to rotate said element about its axis
in the manual opening operation and by a ther
mal element in the automatic operation, said
latch-lever element having two projections, one
on either side of said axis to provide means for
said rotation and still another projection ar
ranged to intercept said latch element unless said
thermal element is in its approximately normal
position; said switch element having a plurality
35 of contacts mounted thereon.
'3. In a ‘device or the class described in com
bination, an operating means; a switch element;
a biased releasable latch for connecting said
switch element to said operating means thru
40 the closing cycle; a tripping means embodying
a bimetallic thermal element; a biased releas
able latch element for holding said switch ele
5. In a device of the class described in com
bination, a biased carrier assembly embodying
an operating means and a switch element having
attached thereto a contact assembly; a tripping
assembly embodying essentially a releasable latch 10
and a bimetallic thermal element, the said
thermal element being arranged to transmit a
movement therefrom due to excessive current,
directly to said releasable latch, said latch being
biased and serving a purpose of retaining said 15
carrier assembly in a closed position, one pro
jection of said latch moving generally in the
same direction as the free end of said thermal
element, one projection moving in the opposite
direction and another projection moving approx 20
imately at right angles to the direction of move~
ment of said thermal element end.
6. In a device of the class described in com
bination, a main supporting element Within an
insulating enclosure; an operating means ‘em
bodying a biased pivoted member having arr-in
25
sulating operating handle affixed to the head
thereof; a switch member having a contact as
sembly attached thereto and movable about an
axis common with that of the said pivoted mem 30
her; a biased releasable means for latching said
operating means to said switch member, sup
ported by a pivoted means from said head of the
aforesaid pivoted member; the said releasable
means having a projection therefrom for the 35
i said latching purpose and another projection
arranged to impinge against a ?xed element
within the said insulating enclosure in order to
rotate said releasable means about its pivot to
release said switch member from said operating 40
means essentially at the closed position; a trip
ping means embodying a biased releasable latch
lever element for retaining both the said operment in a predetermined position and Ior trip
ating means and\ said switch member in the
ping said switch element under a predetermined closed position by the engagement of one pro 45
45 circuit condition, said latch element being piv
jection on said latch-lever element against catch
otcd and movable about an axis centrally located faces on the pivoted ends of said pivoted mem
and having one projection moving generally in her and said switch member; a bimetallic ther
the same direction with the free end of said .mal element for automaticallyv operating said
thermal element, another projection moving in tripping means.
50 the opposite direction and still another projec
'7. In a device of the class described in com
tion moving generally at a right angle to that bination, a main supporting element within an
of the free end of said thermal element, one
insulating enclosure; an operating means; a
said projectidn operating in connection with said switch element having a biased member pivoted
, switch element, another said projection operating
about an axis coinciding with "that of the said 55
55 in connection with said thermal element and the
operating means and having secured thereto a
other said projection operating in connection contact assembly; the said switch element oper
with said releasable latch; an insulating hous- . ating in planes parallel to and opposite said op
ing provided with terminals.
erating means and operatively connected to said
4. In a device of the class described in com
operating means thru the closing cycle only by 60
60
bination, a main supporting element within an
insulating enclosure; an operating means em
bodying a biased pivoted member having an insu
means of a releasable latch element; a tripping
assembly embodying essentially a bimetallic
thermal element, ‘a releasable latch-lever element
for locking said operating means and said
switch element in the closed position, said latch 05
lever element having a projection to provide the
means, said releasable means having a projection said locking arrangement, another projection to
thereon for said latching purpose, another pro- “ contact said thermal element for automatic
tripping and still another projection to trip the
jection arranged to impinge against a ?xed ele
aforesaid releasable latch element in order to 70
70 ment within said enclosure thereby rotating said release said switch element from said operating
releasable means at or near the closed position
and thus releasing said switch memberjrom‘said means prior to ‘the normal closed position of the
said switch element to prevent reclosure against
operating means. said switch member and said
operating member thereby moving to their iully overload; said thermal element being of the bar
75
. opened positions ready for reclosure; a tripping type having terminals at each end thereof.
iating operating handle affixed thereto; a switch
member having a mercury contact element at
tached thereto; a biased pivoted releasable means
for latching said operating means to said switch
2,121,441
8. In a device of the class described in combi
nation, a main supporting element within an in
sulating enclosure; an operating means; a switch
element consisting of a biased member pivoted
about an axis coinciding with that of the said
operating means and having secured thereto a
contact assembly; the said switch element op
erating in planes parallel to and opposite said
operating means and operatively connected to
said operating means thru the closing cycle by
means of a releasable latch element; a tripping
assembly embodying essentially a bimetallic ther
mal element, a releasable latch element for look
ing said operating means and said switch element
1K in the closed position, said releasable latch means
having a projection therefrom to provide the said
locking arrangement, another projection to con
tact said thermal element and still another pro
.iection to tripysaid releasable latch element to
release said switch element from said operating
means prior to the normal closed position of the
said switch element.
»
9. In a device oi’ the class described in combi
nation, an insulating enclosure; a biased pivoted
35 frame element; a biased switch element for
-'opening and closing the circuit; a means for op
‘erating said switch element, said means being
.operatively connected to said frame element; a
tripping assembly embmying a bimetallic titer
3% rnalv element; a biased controlling element op
erated by said thermal element, the said control
ling element latching said switch element in the
closed position and provided with a means to
prevent said switch element being‘closed imme—
diately following a severe overload, and being of
unit construction having a circular movement
about an axis and operatively connected to said
irame element; said thermal element being of
the bar type having a terminal means at each
end thereof.
4
-
\
iii. In a device of the class described, in com
bination, an insulating housing; a frame consist
ing of two plates similar in design and purpose,
held apart by a plurality of separating means to
form a nesting for a carrier assembly, the said
frame being pivoted and biased to a predeter
mined position, said position being determined by
an element fixed to said housing, against which
element a projection on each said plate is in
normal contact by virtue of the said biasing
means; said carrier assembly embodying an op
erating member and a switch member having a
contact assembly mounted thereon; a tripping 10
means embodying a bimetallic thermal element
and a latch-lever clement, said latch-lever ele
ment being supported by the said frame and
movable with said frame in its angular move
ment; a biasing means for said latch-lever ele
ment; said latch-lever element'serving the pur IE
pose of locking said operating element and said
switch element in a closed position and an addi
tional purpose of preventing the ?nal closing
operation of the said switch element unless the 20
said thermal element is in its near normal posi
tion; a means for tripping said latch-lever ele
' ment independent of said frame; the said in
sulating housing being provided with wire ter
minal means.
25
11. In a device of the class described, a circuit
breaker having a slow-make quick-break mech
anism, embodying an operating element; a car»
rier element for electrical contacts, operatively
connected with the said operating element dur so
ing the closing cycle and latched thereto in the
open position; said operating element and said
carrier element each being biased and both sup
ported by a common shaft fixed within a pivoted
frame; a tripping assembly embodying in part '
a bimetallic thermal element; an insulating
housing provided with wire terminals; said
mechanism providing a means to quickly open
said electrical contacts upon a predetermined
circuit condition and to permit a manual reg
closure with a slow motion in said carrier do
element.
KENNETH R. NISBET.
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